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apache / nuttx / refs/heads/master / . / arch / arm / src / samv7 / sam_usbdevhs.c
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/****************************************************************************
* arch/arm/src/samv7/sam_usbdevhs.c
*
* SPDX-License-Identifier: BSD-3-Clause
* SPDX-FileCopyrightText: 2019 Gregory Nutt. All rights reserved.
* SPDX-FileCopyrightText: 2015-2016 Gregory Nutt. All rights reserved.
* SPDX-FileCopyrightText: 2009,2014 Atmel Corporation
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX, Atmel, nor the names of its contributors
* may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/param.h>
#include <sys/types.h>
#include <stdint.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <errno.h>
#include <debug.h>
#include <nuttx/arch.h>
#include <nuttx/kmalloc.h>
#include <nuttx/usb/usb.h>
#include <nuttx/usb/usbdev.h>
#include <nuttx/usb/usbdev_trace.h>
#include <nuttx/irq.h>
#include <arch/barriers.h>
#include <arch/board/board.h>
#include "arm_internal.h"
#include "chip.h"
#include "sam_periphclks.h"
#include "hardware/sam_usbhs.h"
#include "sam_clockconfig.h"
#include "sam_usbdev.h"
#if defined(CONFIG_USBDEV) && defined(CONFIG_SAMV7_USBDEVHS)
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* Configuration ************************************************************/
#ifndef CONFIG_USBDEV_EP0_MAXSIZE
# define CONFIG_USBDEV_EP0_MAXSIZE 64
#endif
#ifndef CONFIG_DEBUG_USB_INFO
# undef CONFIG_SAMV7_USBHS_REGDEBUG
#endif
/* Number of DMA transfer descriptors. Default: 8 */
#ifndef CONFIG_SAMV7_USBDEVHS_NDTDS
# define CONFIG_SAMV7_USBDEVHS_NDTDS 8
#endif
#ifndef CONFIG_USBDEV_DMA
# warning Currently CONFIG_USBDEV_DMA must be set to make all endpoints working
#endif
#if defined(CONFIG_USBDEV_DUALSPEED) && defined(CONFIG_SAMV7_USBDEVHS_LOWPOWER)
# error CONFIG_USBDEV_DUALSPEED must not be defined with full-speed only support
#endif
#if !defined(CONFIG_USBDEV_DUALSPEED) && !defined(CONFIG_SAMV7_USBDEVHS_LOWPOWER)
# warning CONFIG_USBDEV_DUALSPEED should be defined for high speed support
#endif
/* Not yet supported */
#undef CONFIG_SAMV7_USBDEVHS_SCATTERGATHER
/* Driver Definitions *******************************************************/
/* Initial interrupt mask: Reset + Suspend + Correct Transfer */
#define SAM_CNTR_SETUP (USB_CNTR_RESETM|USB_CNTR_SUSPM|USB_CNTR_CTRM)
/* Endpoint definitions */
#define EP0 (0)
#define SAM_EPSET_ALL (0xffff) /* All endpoints */
#define SAM_EPSET_NOTEP0 (0xfffe) /* All endpoints except EP0 */
#define SAM_EP_BIT(ep) (1 << (ep))
#define SAM_EP0_MAXPACKET (64) /* EP0 Max. packet size */
#ifdef CONFIG_SAMV7_USBHS_EP7DMA_WAR
/* Normally EP1..7 should support DMA (0x1fe), but according an ERRATA in
* "Atmel-11296D-ATARM-SAM E70-Datasheet_19-Jan-16" only the EP1..6 support
* the DMA transfer (0x7e)
*/
# define SAM_EPSET_DMA (0x007e) /* All endpoints that support DMA transfers */
#else
# define SAM_EPSET_DMA (0x01fe) /* All endpoints that support DMA transfers */
#endif
/* DMA FIFO */
#define DMA_MAX_FIFO_SIZE (65536/1) /* Max size of the FMA FIFO */
#define EPT_FIFO_SIZE 16384 /* FIFO space size in units of 32-bit words */
/* USB-related masks */
#define REQRECIPIENT_MASK (USB_REQ_TYPE_MASK | USB_REQ_RECIPIENT_MASK)
/* Endpoint register masks (handling toggle fields) */
#define EPR_NOTOG_MASK (USB_EPR_CTR_RX | USB_EPR_SETUP | USB_EPR_EPTYPE_MASK |\
USB_EPR_EP_KIND | USB_EPR_CTR_TX | USB_EPR_EA_MASK)
#define EPR_TXDTOG_MASK (USB_EPR_STATTX_MASK | EPR_NOTOG_MASK)
#define EPR_RXDTOG_MASK (USB_EPR_STATRX_MASK | EPR_NOTOG_MASK)
/* Request queue operations *************************************************/
#define sam_rqempty(q) ((q)->head == NULL)
#define sam_rqpeek(q) ((q)->head)
/* Buffer Alignment *********************************************************
*
* DMA buffers be aligned the 8-byte (2 word boundaries). However, if the
* data cache is enabled the a higher level of alignment is required. That
* is because the data will need to be invalidated and that cache
* invalidation will occur in multiples of full cache lines.
*/
#ifdef CONFIG_ARMV7M_DCACHE
/* Align to the cache line size which we assume is >= 8 */
# define USBHS_ALIGN ARMV7M_DCACHE_LINESIZE
# define USBHS_ALIGN_MASK (USBHS_ALIGN-1)
# define USBHS_ALIGN_DOWN(n) ((n) & ~USBHS_ALIGN_MASK)
# define USBHS_ALIGN_UP(n) (((n) + USBHS_ALIGN_MASK) & ~USBHS_ALIGN_MASK)
# ifndef CONFIG_ARMV7M_DCACHE_WRITETHROUGH
# warning !!! This driver will not work without CONFIG_ARMV7M_DCACHE_WRITETHROUGH=y!!!
# endif
#else
/* Use the minimum alignment requirement */
# define USBHS_ALIGN 8
# define USBHS_ALIGN_MASK 7
# define USBHS_ALIGN_DOWN(n) ((n) & ~7)
# define USBHS_ALIGN_UP(n) (((n) + 7) & ~7)
#endif
/* USB trace ****************************************************************/
/* Trace error codes */
#define SAM_TRACEERR_ALLOCFAIL 0x0001
#define SAM_TRACEERR_BADCLEARFEATURE 0x0002
#define SAM_TRACEERR_BADDEVGETSTATUS 0x0003
#define SAM_TRACEERR_BADEPGETSTATUS 0x0004
#define SAM_TRACEERR_BADEOBSTATE 0x0005
#define SAM_TRACEERR_BADEPNO 0x0006
#define SAM_TRACEERR_BADEPTYPE 0x0007
#define SAM_TRACEERR_BADGETCONFIG 0x0008
#define SAM_TRACEERR_BADGETSETDESC 0x0009
#define SAM_TRACEERR_BADGETSTATUS 0x000a
#define SAM_TRACEERR_BADSETADDRESS 0x000b
#define SAM_TRACEERR_BADSETCONFIG 0x000c
#define SAM_TRACEERR_BADSETFEATURE 0x000d
#define SAM_TRACEERR_BINDFAILED 0x000e
#define SAM_TRACEERR_DISPATCHSTALL 0x000f
#define SAM_TRACEERR_DMAERR 0x0010
#define SAM_TRACEERR_DRIVER 0x0011
#define SAM_TRACEERR_DRIVERREGISTERED 0x0012
#define SAM_TRACERR_REMAINING 0x0013
#define SAM_TRACEERR_EP0SETUPOUTSIZE 0x0014
#define SAM_TRACEERR_EP0SETUPSTALLED 0x0015
#define SAM_TRACEERR_EPOUTNULLPACKET 0x0016
#define SAM_TRACEERR_EPRESERVE 0x0017
#define SAM_TRACEERR_NCFGOK 0x0018
#define SAM_TRACEERR_INVALIDCTRLREQ 0x0019
#define SAM_TRACEERR_IRQREGISTRATION 0x001a
#define SAM_TRACEERR_NOTCONFIGURED 0x001b
#define SAM_TRACEERR_REQABORTED 0x001c
#define SAM_TRACEERR_TXINERR 0x001d
/* Trace interrupt codes */
#define SAM_TRACEINTID_ADDRESSED 0x0001
#define SAM_TRACEINTID_CLEARFEATURE 0x0002
#define SAM_TRACEINTID_INTSUSPD 0x0003
#define SAM_TRACEINTID_DEVGETSTATUS 0x0004
#define SAM_TRACEINTID_DISPATCH 0x0005
#define SAM_TRACEINTID_DMA 0x0006
#define SAM_TRACEINTID_DMAEOB 0x0007
#define SAM_TRACEINTID_DMAEOC 0x0008
#define SAM_TRACEINTID_ENDRESET 0x0009
#define SAM_TRACEINTID_EP 0x000a
#define SAM_TRACEINTID_EP0SETUPIN 0x000b
#define SAM_TRACEINTID_EP0SETUPOUT 0x000c
#define SAM_TRACEINTID_EP0SETUPSETADDRESS 0x000d
#define SAM_TRACEINTID_EPDMAINT 0x000e
#define SAM_TRACEINTID_EPGETSTATUS 0x000f
#define SAM_TRACEINTID_EPINQEMPTY 0x0010
#define SAM_TRACEINTID_EPINT 0x0011
#define SAM_TRACEINTID_EPOUTQEMPTY 0x0012
#define SAM_TRACEINTID_GETCONFIG 0x0013
#define SAM_TRACEINTID_GETSETDESC 0x0014
#define SAM_TRACEINTID_GETSETIF 0x0015
#define SAM_TRACEINTID_GETSTATUS 0x0016
#define SAM_TRACEINTID_IFGETSTATUS 0x0017
#define SAM_TRACEINTID_INTERRUPT 0x0018
#define SAM_TRACEINTID_INTSOF 0x0019
#define SAM_TRACEINTID_INTMSOF 0x001a
#define SAM_TRACEINTID_NOSTDREQ 0x001b
#define SAM_TRACEINTID_PENDING 0x001c
#define SAM_TRACEINTID_RXRDY 0x001d
#define SAM_TRACEINTID_RXSETUP 0x001e
#define SAM_TRACEINTID_SETCONFIG 0x001f
#define SAM_TRACEINTID_SETFEATURE 0x0020
#define SAM_TRACEINTID_SPEED 0x0021
#define SAM_TRACEINTID_STALLSNT 0x0022
#define SAM_TRACEINTID_SYNCHFRAME 0x0023
#define SAM_TRACEINTID_TXINI 0x0024
#define SAM_TRACEINTID_UPSTRRES 0x0025
#define SAM_TRACEINTID_WAKEUP 0x0026
/* Byte ordering in host-based values */
#ifdef CONFIG_ENDIAN_BIG
# define LSB 1
# define MSB 0
#else
# define LSB 0
# define MSB 1
#endif
/****************************************************************************
*
* Private Types
****************************************************************************/
/* State of an endpoint */
enum sam_epstate_e
{
/* --- All Endpoints --- */
USBHS_EPSTATE_DISABLED = 0, /* Endpoint is disabled */
USBHS_EPSTATE_STALLED, /* Endpoint is stalled */
USBHS_EPSTATE_IDLE, /* Endpoint is idle (i.e. ready for transmission) */
USBHS_EPSTATE_SENDING, /* Endpoint is sending data */
USBHS_EPSTATE_SENDING_DMA, /* Endpoint is sending data via DMA */
USBHS_EPSTATE_NBUSYBK, /* Endpoint DMA complete, waiting for NBUSYBK==0 */
USBHS_EPSTATE_RECEIVING, /* Endpoint is receiving data */
/* --- Endpoint 0 Only --- */
USBHS_EPSTATE_EP0DATAOUT, /* Endpoint 0 is receiving SETUP OUT data */
USBHS_EPSTATE_EP0STATUSIN, /* Endpoint 0 is sending SETUP status */
USBHS_EPSTATE_EP0ADDRESS /* Address change is pending completion of status */
};
/* The overall state of the device */
enum sam_devstate_e
{
USBHS_DEVSTATE_SUSPENDED = 0, /* The device is currently suspended */
USBHS_DEVSTATE_POWERED, /* Host is providing +5V through the USB cable */
USBHS_DEVSTATE_DEFAULT, /* Device has been reset */
USBHS_DEVSTATE_ADDRESSED, /* The device has been given an address on the bus */
USBHS_DEVSTATE_CONFIGURED /* A valid configuration has been selected. */
};
/* The result of EP0 SETUP processing */
enum sam_ep0setup_e
{
USBHS_EP0SETUP_SUCCESS = 0, /* The SETUP was handle without incident */
USBHS_EP0SETUP_DISPATCHED, /* The SETUP was forwarded to the class driver */
USBHS_EP0SETUP_ADDRESS, /* A new device address is pending */
USBHS_EP0SETUP_STALL /* An error occurred */
};
/* DMA transfer descriptor */
#ifdef CONFIG_SAMV7_USBDEVHS_SCATTERGATHER
struct sam_dtd_s
{
struct usbhs_dtd_s hw; /* These are the fields as seen by the hardware */
uint32_t pad; /* Pad to 16 bytes to support arrays of descriptors */
};
#define SIZEOF_SAM_DTD_S 16
#endif
/* The following is used to manage lists of free DMA transfer descriptors */
struct sam_list_s
{
struct sam_list_s *flink; /* Link to next entry in the list */
/* Variable length entry data follows */
};
union wb_u
{
uint16_t w;
uint8_t b[2];
};
/* A container for a request so that the request make be retained in a list */
struct sam_req_s
{
struct usbdev_req_s req; /* Standard USB request */
struct sam_req_s *flink; /* Supports a singly linked list */
uint16_t inflight; /* Number of TX bytes written to FIFO */
};
/* The head of a queue of requests */
struct sam_rqhead_s
{
struct sam_req_s *head; /* Requests are added to the head of the list */
struct sam_req_s *tail; /* Requests are removed from the tail of the list */
};
/* This is the internal representation of an endpoint */
struct sam_ep_s
{
/* Common endpoint fields. This must be the first thing defined in the
* structure so that it is possible to simply cast from struct usbdev_ep_s
* to struct sam_ep_s.
*/
struct usbdev_ep_s ep; /* Standard endpoint structure */
/* SAMV7-specific fields */
struct sam_usbdev_s *dev; /* Reference to private driver data */
struct sam_rqhead_s reqq; /* Read/write request queue */
#ifdef CONFIG_SAMV7_USBDEVHS_SCATTERGATHER
struct sam_dtd_s *dtdll; /* Head of the DMA transfer descriptor list */
#endif
volatile uint8_t epstate; /* State of the endpoint (see enum sam_epstate_e) */
volatile uint8_t bank; /* Current reception bank (0 or 1) */
uint8_t stalled:1; /* true: Endpoint is stalled */
uint8_t halted:1; /* true: Endpoint feature halted */
uint8_t zlpneeded:1; /* Zero length packet needed at end of transfer */
uint8_t zlpsent:1; /* Zero length packet has been sent */
};
struct sam_usbdev_s
{
/* Common device fields. This must be the first thing defined in the
* structure so that it is possible to simply cast from struct usbdev_s
* to structsam_usbdev_s.
*/
struct usbdev_s usbdev;
/* The bound device class driver */
struct usbdevclass_driver_s *driver;
/* USBHS-specific fields */
struct usb_ctrlreq_s ctrl; /* Last EP0 request */
uint8_t devstate; /* State of the device (see enum sam_devstate_e) */
uint8_t prevstate; /* Previous state of the device before SUSPEND */
uint8_t selfpowered:1; /* 1: Device is self powered */
uint16_t epavail; /* Bitset of available endpoints */
/* DMA Transfer descriptors */
#ifdef CONFIG_SAMV7_USBDEVHS_SCATTERGATHER
struct sam_dtd_s *tdfree; /* A list of free transfer descriptors */
#ifndef CONFIG_SAMV7_USBDEVHS_PREALLOCATE
struct sam_dtd_s *tdpool; /* Pool of allocated DMA transfer descriptors */
#endif
#endif
/* The endpoint list */
struct sam_ep_s eplist[SAM_USBHS_NENDPOINTS];
/* EP0 data buffer. For data that is included in an EP0 SETUP OUT
* transaction. In this case, no request is in place from the class
* driver and the incoming data is caught in this buffer. The size
* of valid dat in the buffer is given by ctrlreg.len[]. For the
* case of EP0 SETUP IN transaction, the normal request mechanism is
* used and the class driver provides the buffering.
*/
uint8_t ep0out[SAM_EP0_MAXPACKET];
};
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/* Register operations ******************************************************/
#ifdef CONFIG_SAMV7_USBHS_REGDEBUG
static void sam_printreg(uintptr_t regaddr, uint32_t regval, bool iswrite);
static void sam_checkreg(uintptr_t regaddr, uint32_t regval, bool iswrite);
static uint32_t sam_getreg(uintptr_t regaddr);
static void sam_putreg(uint32_t regval, uintptr_t regaddr);
static void sam_dumpep(struct sam_usbdev_s *priv, int epno);
#else
static inline uint32_t sam_getreg(uintptr_t regaddr);
static inline void sam_putreg(uint32_t regval, uintptr_t regaddr);
# define sam_dumpep(priv,epno)
#endif
/* Suspend/Resume Helpers ***************************************************/
static void sam_suspend(struct sam_usbdev_s *priv);
static void sam_resume(struct sam_usbdev_s *priv);
/* DMA Transfer Helpers *****************************************************/
#ifdef CONFIG_SAMV7_USBDEVHS_SCATTERGATHER
static struct sam_dtd_s *sam_dtd_alloc(struct sam_usbdev_s *priv);
static void sam_dtd_free(struct sam_usbdev_s *priv, struct sam_dtd_s *dtd);
#endif
static void sam_dma_single(uint8_t epno, struct sam_req_s *privreq,
uint32_t dmacontrol);
static void sam_dma_wrsetup(struct sam_usbdev_s *priv,
struct sam_ep_s *privep, struct sam_req_s *privreq);
static void sam_dma_rdsetup(struct sam_usbdev_s *priv,
struct sam_ep_s *privep, struct sam_req_s *privreq);
/* Request Helpers **********************************************************/
static struct sam_req_s *
sam_req_dequeue(struct sam_rqhead_s *queue);
static void sam_req_enqueue(struct sam_rqhead_s *queue,
struct sam_req_s *req);
static inline void
sam_req_abort(struct sam_ep_s *privep,
struct sam_req_s *privreq, int16_t result);
static void sam_req_complete(struct sam_ep_s *privep, int16_t result);
static void sam_ep_fifocon(unsigned int epno);
static void sam_req_wrsetup(struct sam_usbdev_s *priv,
struct sam_ep_s *privep, struct sam_req_s *privreq);
static int sam_req_write(struct sam_usbdev_s *priv,
struct sam_ep_s *privep);
static void sam_req_rddone(struct sam_usbdev_s *priv,
struct sam_ep_s *privep, struct sam_req_s *privreq,
uint16_t recvsize);
static void sam_req_rdenable(uint8_t epno);
static void sam_req_rddisable(uint8_t epno);
static int sam_req_read(struct sam_usbdev_s *priv,
struct sam_ep_s *privep, uint16_t recvsize);
static void sam_req_cancel(struct sam_ep_s *privep, int16_t status);
/* Interrupt level processing ***********************************************/
static void sam_ep0_read(uint8_t *buffer, size_t buflen);
static void sam_ctrlep_write(struct sam_ep_s *privep,
const uint8_t *buffer, size_t buflen);
static void sam_ep_write(struct sam_ep_s *privep, const uint8_t *buffer,
size_t buflen);
static void sam_ep0_dispatch(struct sam_usbdev_s *priv);
static void sam_ep0_setup(struct sam_usbdev_s *priv);
#ifdef CONFIG_USBDEV_DMA
static void sam_dma_interrupt(struct sam_usbdev_s *priv, int epno);
#endif
static void sam_ep_interrupt(struct sam_usbdev_s *priv, int epno);
static int sam_usbhs_interrupt(int irq, void *context, void *arg);
/* Endpoint helpers *********************************************************/
static void sam_ep_reset(struct sam_usbdev_s *priv, uint8_t epno);
static void sam_epset_reset(struct sam_usbdev_s *priv, uint16_t epset);
static inline struct sam_ep_s *
sam_ep_reserve(struct sam_usbdev_s *priv, uint16_t epset);
static inline void
sam_ep_unreserve(struct sam_usbdev_s *priv,
struct sam_ep_s *privep);
static int sam_ep_configure_internal(struct sam_ep_s *privep,
const struct usb_epdesc_s *desc);
static inline int
sam_ep0_configure(struct sam_usbdev_s *priv);
/* Endpoint operations ******************************************************/
static int sam_ep_configure(struct usbdev_ep_s *ep,
const struct usb_epdesc_s *desc, bool last);
static int sam_ep_disable(struct usbdev_ep_s *ep);
static struct usbdev_req_s *
sam_ep_allocreq(struct usbdev_ep_s *ep);
static void sam_ep_freereq(struct usbdev_ep_s *ep,
struct usbdev_req_s *);
#ifdef CONFIG_USBDEV_DMA
static void *sam_ep_allocbuffer(struct usbdev_ep_s *ep, uint16_t nbytes);
static void sam_ep_freebuffer(struct usbdev_ep_s *ep, void *buf);
#endif
static int sam_ep_submit(struct usbdev_ep_s *ep,
struct usbdev_req_s *req);
static int sam_ep_cancel(struct usbdev_ep_s *ep,
struct usbdev_req_s *req);
static int sam_ep_stall(struct usbdev_ep_s *ep, bool resume);
/* USB device controller operations *****************************************/
static struct usbdev_ep_s *
sam_allocep(struct usbdev_s *dev, uint8_t epno, bool in,
uint8_t eptype);
static void sam_freeep(struct usbdev_s *dev, struct usbdev_ep_s *ep);
static int sam_getframe(struct usbdev_s *dev);
static int sam_wakeup(struct usbdev_s *dev);
static int sam_selfpowered(struct usbdev_s *dev, bool selfpowered);
static int sam_pullup(struct usbdev_s *dev, bool enable);
/* Initialization/Reset *****************************************************/
static void sam_reset(struct sam_usbdev_s *priv);
static void sam_hw_setup(struct sam_usbdev_s *priv);
static void sam_sw_setup(struct sam_usbdev_s *priv);
static void sam_hw_shutdown(struct sam_usbdev_s *priv);
static void sam_sw_shutdown(struct sam_usbdev_s *priv);
/****************************************************************************
* Private Data
****************************************************************************/
/* Since there is only a single USB interface, all status information can be
* be simply retained in a single global instance.
*/
static struct sam_usbdev_s g_usbhs;
static const struct usbdev_epops_s g_epops =
{
.configure = sam_ep_configure,
.disable = sam_ep_disable,
.allocreq = sam_ep_allocreq,
.freereq = sam_ep_freereq,
#ifdef CONFIG_USBDEV_DMA
.allocbuffer = sam_ep_allocbuffer,
.freebuffer = sam_ep_freebuffer,
#endif
.submit = sam_ep_submit,
.cancel = sam_ep_cancel,
.stall = sam_ep_stall,
};
static const struct usbdev_ops_s g_devops =
{
.allocep = sam_allocep,
.freeep = sam_freeep,
.getframe = sam_getframe,
.wakeup = sam_wakeup,
.selfpowered = sam_selfpowered,
.pullup = sam_pullup,
};
/* This describes endpoint 0 */
static const struct usb_epdesc_s g_ep0desc =
{
.len = USB_SIZEOF_EPDESC,
.type = USB_DESC_TYPE_ENDPOINT,
.addr = EP0,
.attr = USB_EP_ATTR_XFER_CONTROL,
.mxpacketsize =
{64, 0},
.interval = 0
};
#ifdef CONFIG_SAMV7_USBDEVHS_SCATTERGATHER
#ifdef CONFIG_SAMV7_USBDEVHS_PREALLOCATE
/* This is a properly aligned pool of preallocated DMA transfer descriptors */
static struct sam_dtd_s g_dtdpool[CONFIG_SAMV7_USBDEVHS_NDTDS]
aligned_data(16);
#endif
#endif
/* Device error strings that may be enabled for more descriptive USB trace
* output.
*/
#ifdef CONFIG_USBDEV_TRACE_STRINGS
const struct trace_msg_t g_usb_trace_strings_deverror[] =
{
TRACE_STR(SAM_TRACEERR_ALLOCFAIL),
TRACE_STR(SAM_TRACEERR_BADCLEARFEATURE),
TRACE_STR(SAM_TRACEERR_BADDEVGETSTATUS),
TRACE_STR(SAM_TRACEERR_BADEPGETSTATUS),
TRACE_STR(SAM_TRACEERR_BADEOBSTATE),
TRACE_STR(SAM_TRACEERR_BADEPNO),
TRACE_STR(SAM_TRACEERR_BADEPTYPE),
TRACE_STR(SAM_TRACEERR_BADGETCONFIG),
TRACE_STR(SAM_TRACEERR_BADGETSETDESC),
TRACE_STR(SAM_TRACEERR_BADGETSTATUS),
TRACE_STR(SAM_TRACEERR_BADSETADDRESS),
TRACE_STR(SAM_TRACEERR_BADSETCONFIG),
TRACE_STR(SAM_TRACEERR_BADSETFEATURE),
TRACE_STR(SAM_TRACEERR_BINDFAILED),
TRACE_STR(SAM_TRACEERR_DISPATCHSTALL),
TRACE_STR(SAM_TRACEERR_DMAERR),
TRACE_STR(SAM_TRACEERR_DRIVER),
TRACE_STR(SAM_TRACEERR_DRIVERREGISTERED),
TRACE_STR(SAM_TRACERR_REMAINING),
TRACE_STR(SAM_TRACEERR_EP0SETUPOUTSIZE),
TRACE_STR(SAM_TRACEERR_EP0SETUPSTALLED),
TRACE_STR(SAM_TRACEERR_EPOUTNULLPACKET),
TRACE_STR(SAM_TRACEERR_EPRESERVE),
TRACE_STR(SAM_TRACEERR_NCFGOK),
TRACE_STR(SAM_TRACEERR_INVALIDCTRLREQ),
TRACE_STR(SAM_TRACEERR_IRQREGISTRATION),
TRACE_STR(SAM_TRACEERR_NOTCONFIGURED),
TRACE_STR(SAM_TRACEERR_REQABORTED),
TRACE_STR(SAM_TRACEERR_TXINERR),
TRACE_STR_END
};
#endif
/* Interrupt event strings that may be enabled for more descriptive USB trace
* output.
*/
#ifdef CONFIG_USBDEV_TRACE_STRINGS
const struct trace_msg_t g_usb_trace_strings_intdecode[] =
{
TRACE_STR(SAM_TRACEINTID_ADDRESSED),
TRACE_STR(SAM_TRACEINTID_CLEARFEATURE),
TRACE_STR(SAM_TRACEINTID_INTSUSPD),
TRACE_STR(SAM_TRACEINTID_DEVGETSTATUS),
TRACE_STR(SAM_TRACEINTID_DISPATCH),
TRACE_STR(SAM_TRACEINTID_DMA),
TRACE_STR(SAM_TRACEINTID_DMAEOB),
TRACE_STR(SAM_TRACEINTID_DMAEOC),
TRACE_STR(SAM_TRACEINTID_ENDRESET),
TRACE_STR(SAM_TRACEINTID_EP),
TRACE_STR(SAM_TRACEINTID_EP0SETUPIN),
TRACE_STR(SAM_TRACEINTID_EP0SETUPOUT),
TRACE_STR(SAM_TRACEINTID_EP0SETUPSETADDRESS),
TRACE_STR(SAM_TRACEINTID_EPDMAINT),
TRACE_STR(SAM_TRACEINTID_EPGETSTATUS),
TRACE_STR(SAM_TRACEINTID_EPINQEMPTY),
TRACE_STR(SAM_TRACEINTID_EPINT),
TRACE_STR(SAM_TRACEINTID_EPOUTQEMPTY),
TRACE_STR(SAM_TRACEINTID_GETCONFIG),
TRACE_STR(SAM_TRACEINTID_GETSETDESC),
TRACE_STR(SAM_TRACEINTID_GETSETIF),
TRACE_STR(SAM_TRACEINTID_GETSTATUS),
TRACE_STR(SAM_TRACEINTID_IFGETSTATUS),
TRACE_STR(SAM_TRACEINTID_INTERRUPT),
TRACE_STR(SAM_TRACEINTID_INTSOF),
TRACE_STR(SAM_TRACEINTID_INTMSOF),
TRACE_STR(SAM_TRACEINTID_NOSTDREQ),
TRACE_STR(SAM_TRACEINTID_PENDING),
TRACE_STR(SAM_TRACEINTID_RXRDY),
TRACE_STR(SAM_TRACEINTID_RXSETUP),
TRACE_STR(SAM_TRACEINTID_SETCONFIG),
TRACE_STR(SAM_TRACEINTID_SETFEATURE),
TRACE_STR(SAM_TRACEINTID_SPEED),
TRACE_STR(SAM_TRACEINTID_STALLSNT),
TRACE_STR(SAM_TRACEINTID_SYNCHFRAME),
TRACE_STR(SAM_TRACEINTID_TXINI),
TRACE_STR(SAM_TRACEINTID_UPSTRRES),
TRACE_STR(SAM_TRACEINTID_WAKEUP),
TRACE_STR_END
};
#endif
/****************************************************************************
* Private Private Functions
****************************************************************************/
/****************************************************************************
* Register Operations
****************************************************************************/
/****************************************************************************
* Name: sam_printreg
*
* Description:
* Print the contents of a SAMV7 USBHS register
*
****************************************************************************/
#ifdef CONFIG_SAMV7_USBHS_REGDEBUG
static void sam_printreg(uintptr_t regaddr, uint32_t regval, bool iswrite)
{
uinfo("%p%s%08x\n", regaddr, iswrite ? "<-" : "->", regval);
}
#endif
/****************************************************************************
* Name: sam_checkreg
*
* Description:
* Check if it is time to output debug information for accesses to a SAMV7
* USBHS register
*
****************************************************************************/
#ifdef CONFIG_SAMV7_USBHS_REGDEBUG
static void sam_checkreg(uintptr_t regaddr, uint32_t regval, bool iswrite)
{
static uintptr_t prevaddr = 0;
static uint32_t preval = 0;
static uint32_t count = 0;
static bool prevwrite = false;
/* Is this the same value that we read from/wrote
* to the same register last time?
* Are we polling the register? If so, suppress the output.
*/
if (regaddr == prevaddr && regval == preval && prevwrite == iswrite)
{
/* Yes.. Just increment the count */
count++;
}
else
{
/* No this is a new address or value or operation. Were there any
* duplicate accesses before this one?
*/
if (count > 0)
{
/* Yes.. Just one? */
if (count == 1)
{
/* Yes.. Just one */
sam_printreg(prevaddr, preval, prevwrite);
}
else
{
/* No.. More than one. */
uinfo("[repeats %d more times]\n", count);
}
}
/* Save the new address, value, count, and operation for next time */
prevaddr = regaddr;
preval = regval;
count = 0;
prevwrite = iswrite;
/* Show the new register access */
sam_printreg(regaddr, regval, iswrite);
}
}
#endif
/****************************************************************************
* Name: sam_getreg
*
* Description:
* Get the contents of an SAMV7 register
*
****************************************************************************/
#ifdef CONFIG_SAMV7_USBHS_REGDEBUG
static uint32_t sam_getreg(uintptr_t regaddr)
{
/* Read the value from the register */
uint32_t regval = getreg32(regaddr);
/* Check if we need to print this value */
sam_checkreg(regaddr, regval, false);
return regval;
}
#else
static inline uint32_t sam_getreg(uintptr_t regaddr)
{
return getreg32(regaddr);
}
#endif
/****************************************************************************
* Name: sam_putreg
*
* Description:
* Set the contents of an SAMV7 register to a value
*
****************************************************************************/
#ifdef CONFIG_SAMV7_USBHS_REGDEBUG
static void sam_putreg(uint32_t regval, uintptr_t regaddr)
{
/* Check if we need to print this value */
sam_checkreg(regaddr, regval, true);
/* Write the value */
putreg32(regval, regaddr);
}
#else
static inline void sam_putreg(uint32_t regval, uintptr_t regaddr)
{
putreg32(regval, regaddr);
}
#endif
/****************************************************************************
* Name: sam_dumpep
****************************************************************************/
#ifdef CONFIG_SAMV7_USBHS_REGDEBUG
static void sam_dumpep(struct sam_usbdev_s *priv, int epno)
{
/* Global Registers */
uinfo("Global Register:\n");
uinfo(" CTRL: %08x\n", sam_getreg(SAM_USBHS_DEVCTRL));
uinfo(" ISR: %08x\n", sam_getreg(SAM_USBHS_DEVISR));
uinfo(" IMR: %08x\n", sam_getreg(SAM_USBHS_DEVIMR));
uinfo(" EPT: %08x\n", sam_getreg(SAM_USBHS_DEVEPT));
uinfo(" FNUM: %08x\n", sam_getreg(SAM_USBHS_DEVFNUM));
/* Endpoint registers */
uinfo("Endpoint %d Register:\n", epno);
uinfo(" CFG: %08x\n", sam_getreg(SAM_USBHS_DEVEPTCFG(epno)));
uinfo(" ISR: %08x\n", sam_getreg(SAM_USBHS_DEVEPTISR(epno)));
uinfo(" IMR: %08x\n", sam_getreg(SAM_USBHS_DEVEPTIMR(epno)));
uinfo("DMA %d Register:\n", epno);
if ((SAM_EPSET_DMA & SAM_EP_BIT(epno)) != 0)
{
uinfo(" NXTDSC: %08x\n", sam_getreg(SAM_USBHS_DEVDMANXTDSC(epno)));
uinfo(" ADDRESS: %08x\n", sam_getreg(SAM_USBHS_DEVDMAADDR(epno)));
uinfo(" CONTROL: %08x\n", sam_getreg(SAM_USBHS_DEVDMACTRL(epno)));
uinfo(" STATUS: %08x\n", sam_getreg(SAM_USBHS_DEVDMASTA(epno)));
}
else
{
uinfo(" None\n");
}
}
#endif
/****************************************************************************
* DMA
****************************************************************************/
/****************************************************************************
* Name: sam_dtd_alloc
*
* Description:
* Allocate a DMA transfer descriptor by removing it from the free list
*
* Assumption: Caller holds the lock
*
****************************************************************************/
#ifdef CONFIG_SAMV7_USBDEVHS_SCATTERGATHER
static struct sam_dtd_s *sam_dtd_alloc(struct sam_usbdev_s *priv)
{
struct sam_dtd_s *dtd;
/* Remove the DMA transfer descriptor from the freelist */
dtd = (struct sam_dtd_s *)g_usbhs.dtdfree;
if (dtd)
{
g_usbhs.dtdfree = ((struct sam_list_s *)dtd)->flink;
memset(dtd, 0, sizeof(struct sam_dtd_s));
}
return dtd;
}
#endif
/****************************************************************************
* Name: sam_dtd_free
*
* Description:
* Free a DMA transfer descriptor by returning it to the free list
*
* Assumption: Caller holds the lock
*
****************************************************************************/
#ifdef CONFIG_SAMV7_USBDEVHS_SCATTERGATHER
static void sam_dtd_free(struct sam_usbdev_s *priv, struct sam_dtd_s *dtd)
{
struct sam_list_s *entry = (struct sam_list_s *)dtd;
/* Put the dtd structure back into the free list */
entry->flink = g_usbhs.dtdfree;
g_usbhs.dtdfree = entry;
}
#endif
/****************************************************************************
* Name: sam_dma_single
*
* Description:
* Setup a start a single buffer DMA.
*
* Assumption: Called as part of USBHS interrupt handling
*
****************************************************************************/
static void sam_dma_single(uint8_t epno, struct sam_req_s *privreq,
uint32_t dmacontrol)
{
uintptr_t buffer;
/* Not all endpoints support DMA */
DEBUGASSERT((SAM_EPSET_DMA & SAM_EP_BIT(epno)) != 0);
/* Flush the contents of the DMA buffer to RAM */
buffer = (uintptr_t)&privreq->req.buf[privreq->req.xfrd];
up_clean_dcache(buffer, buffer + privreq->inflight);
/* Set up the DMA */
sam_putreg((uint32_t)buffer, SAM_USBHS_DEVDMAADDR(epno));
/* Clear any pending interrupts then enable the DMA interrupt */
sam_getreg(SAM_USBHS_DEVDMASTA(epno));
sam_putreg(USBHS_DEVINT_DMA(epno), SAM_USBHS_DEVIER);
/* Setup and enable the DMA */
sam_putreg(0, SAM_USBHS_DEVDMACTRL(epno));
dmacontrol |= USBHS_DEVDMACTRL_BUFLEN(privreq->inflight);
sam_putreg(dmacontrol, SAM_USBHS_DEVDMACTRL(epno));
}
/****************************************************************************
* Name: sam_dma_wrsetup
*
* Description:
* Process the next queued write request for an endpoint that supports DMA.
*
****************************************************************************/
static void sam_dma_wrsetup(struct sam_usbdev_s *priv,
struct sam_ep_s *privep, struct sam_req_s *privreq)
{
int remaining;
int epno;
/* Switch to the sending state */
privep->epstate = USBHS_EPSTATE_SENDING_DMA;
privreq->inflight = 0;
/* Get the endpoint number */
epno = USB_EPNO(privep->ep.eplog);
/* How many bytes remain to be transferred in the request? */
remaining = (int)privreq->req.len - (int)privreq->req.xfrd;
DEBUGASSERT(remaining >= 0 && remaining <= (int)privreq->req.len);
/* If there are no bytes to send, then send a zero length packet */
if (remaining > 0)
{
/* Clip the transfer to the size of the DMA FIFO */
#if USBDEV_MAXREQUEUST > DMA_MAX_FIFO_SIZE
if (remaining > DMA_MAX_FIFO_SIZE)
{
privreq->inflight = DMA_MAX_FIFO_SIZE;
privep->zlpneeded = false;
}
else
#endif
{
privreq->inflight = remaining;
/* If the size is an exact multiple of full packets, then note if
* we need to send a zero length packet next.
*/
privep->zlpneeded =
((privreq->req.flags & USBDEV_REQFLAGS_NULLPKT) != 0 &&
(remaining % privep->ep.maxpacket) == 0);
}
/* And perform the single DMA transfer.
*
* 32.6.10.6 Bulk IN or Interrupt IN: Sending a Buffer Using DMA
* - END_B_EN: The endpoint can validate the packet (according to the
* values programmed in the AUTO_VALID and SHRT_PCKT fields of
* USBHS_EPTCTLx.) ...
* - END_BUFFIT: generate an interrupt when the BUFF_COUNT in
* USBHS_DMASTATUSx reaches 0.
* - CHANN_ENB: Run and stop at end of buffer
*/
sam_dma_single(epno, privreq,
USBHS_DEVDMACTRL_ENDBEN | USBHS_DEVDMACTRL_ENDBUFFIT |
USBHS_DEVDMACTRL_CHANNENB);
}
/* Enable the endpoint interrupt */
sam_putreg(USBHS_DEVINT_PEP(epno), SAM_USBHS_DEVIER);
}
/****************************************************************************
* Name: sam_dma_rdsetup
*
* Description:
* Process the next queued read request for an endpoint that supports DMA.
*
****************************************************************************/
static void sam_dma_rdsetup(struct sam_usbdev_s *priv,
struct sam_ep_s *privep,
struct sam_req_s *privreq)
{
uint32_t regval;
int remaining;
int epno;
/* Get the endpoint number */
epno = USB_EPNO(privep->ep.eplog);
/* How many more bytes can we append to the request buffer? */
remaining = (int)privreq->req.len - (int)privreq->req.xfrd;
DEBUGASSERT(remaining > 0 && remaining <= (int)privreq->req.len &&
privep->epstate == USBHS_EPSTATE_RECEIVING);
/* Clip the DMA transfer size to the size available in the user buffer */
#if USBDEV_MAXREQUEUST > DMA_MAX_FIFO_SIZE
if (remaining > DMA_MAX_FIFO_SIZE)
{
privreq->inflight = DMA_MAX_FIFO_SIZE;
}
else
#endif
{
privreq->inflight = remaining;
}
/* And perform the single DMA transfer.
*
* 32.6.10.12 Bulk OUT or Interrupt OUT: Sending a Buffer Using DMA
* - END_B_EN: Can be used for OUT packet truncation (discarding of
* unbuffered packet data) at the end of DMA buffer.
* - END_BUFFIT: Generate an interrupt when BUFF_COUNT in the
* USBHS_DMASTATUSx register reaches 0.
* - END_TR_EN: End of transfer enable, the USBHS device can put an
* end to the current DMA transfer, in case of a short packet.
* - END_TR_IT: End of transfer interrupt enable, an interrupt is sent
* after the last USB packet has been transferred by the DMA, if the
* USB transfer ended with a short packet. (Beneficial when the
* receive size is unknown.)
* - CHANN_ENB: Run and stop at end of buffer.
*/
regval = USBHS_DEVDMACTRL_ENDBEN | USBHS_DEVDMACTRL_ENDBUFFIT |
USBHS_DEVDMACTRL_ENDTREN | USBHS_DEVDMACTRL_ENDTRIT |
USBHS_DEVDMACTRL_CHANNENB;
sam_dma_single(epno, privreq, regval);
}
/****************************************************************************
*
* Request Helpers
*
****************************************************************************/
/****************************************************************************
*
* Name: sam_req_dequeue
*
****************************************************************************/
static struct sam_req_s *sam_req_dequeue(struct sam_rqhead_s *queue)
{
struct sam_req_s *ret = queue->head;
if (ret)
{
queue->head = ret->flink;
if (!queue->head)
{
queue->tail = NULL;
}
ret->flink = NULL;
}
return ret;
}
/****************************************************************************
*
* Name: sam_req_enqueue
*
****************************************************************************/
static void sam_req_enqueue(struct sam_rqhead_s *queue,
struct sam_req_s *req)
{
req->flink = NULL;
if (!queue->head)
{
queue->head = req;
queue->tail = req;
}
else
{
queue->tail->flink = req;
queue->tail = req;
}
}
/****************************************************************************
*
* Name: sam_req_abort
*
****************************************************************************/
static inline void
sam_req_abort(struct sam_ep_s *privep, struct sam_req_s *privreq,
int16_t result)
{
usbtrace(TRACE_DEVERROR(SAM_TRACEERR_REQABORTED),
(uint16_t)USB_EPNO(privep->ep.eplog));
/* Save the result in the request structure */
privreq->req.result = result;
/* Callback to the request completion handler */
privreq->req.callback(&privep->ep, &privreq->req);
}
/****************************************************************************
*
* Name: sam_req_complete
*
****************************************************************************/
static void sam_req_complete(struct sam_ep_s *privep, int16_t result)
{
struct sam_req_s *privreq;
irqstate_t flags;
/* Remove the completed request at the head of the endpoint request list */
flags = enter_critical_section();
privreq = sam_req_dequeue(&privep->reqq);
leave_critical_section(flags);
if (privreq)
{
/* Save the result in the request structure */
privreq->req.result = result;
/* Reset the endpoint state and restore the stalled indication.
*
* At least the USB class CDC/ACM calls the function
* sam_ep_submit within the callback.
* This function uses sam_req_write or
* sam_req_read to process the request,
* both functions can change the state.
* Therefore it is very important to set
* the state to USBHS_EPSTATE_IDLE
* before the callback is called.
*/
privep->epstate = USBHS_EPSTATE_IDLE;
privep->zlpneeded = false;
privep->zlpsent = false;
/* Callback to the request completion handler */
privreq->flink = NULL;
privreq->req.callback(&privep->ep, &privreq->req);
}
}
/****************************************************************************
*
* Name: sam_ep_fifocon
*
* Description:
* IN data has been loaded in the endpoint FIFO. Manage the endpoint to
* (1) initiate sending of the data and (2) receive the TXIN interrupt
* when the transfer completes.
*
****************************************************************************/
static void sam_ep_fifocon(unsigned int epno)
{
/* Clear FIFOCON to indicate that the packet is ready to send (this works
* even for zero length packets). We will get an TXIN interrupt with
* FIFCON=1 when the transfer completes. Then we are able to send the
* next packet.
*/
sam_putreg(USBHS_DEVEPTINT_FIFOCONI, SAM_USBHS_DEVEPTIDR(epno));
/* Clear the NAK IN bit to stop NAKing IN tokens from the host. We now
* have data ready to go.
*
* REVISIT: I don't think the USBHS_DEVEPTINT_NAKINI is necessary.
*/
sam_putreg(USBHS_DEVEPTINT_NAKINI, SAM_USBHS_DEVEPTICR(epno));
/* Enable the TXIN interrupt on the endpoint */
sam_putreg(USBHS_DEVEPTINT_TXINI, SAM_USBHS_DEVEPTIER(epno));
}
/****************************************************************************
*
* Name: sam_req_wrsetup
*
* Description:
* Process the next queued write request for an endpoint that does not
* support DMA.
*
****************************************************************************/
static void sam_req_wrsetup(struct sam_usbdev_s *priv,
struct sam_ep_s *privep,
struct sam_req_s *privreq)
{
uint32_t regval;
const uint8_t *buf;
uint8_t epno;
unsigned int eptype;
int nbytes;
/* Get the unadorned endpoint number */
epno = USB_EPNO(privep->ep.eplog);
/* Get the number of bytes remaining to be sent. */
DEBUGASSERT(privreq->req.xfrd < privreq->req.len);
nbytes = privreq->req.len - privreq->req.xfrd;
/* Either send the maxpacketsize or all of the remaining data in
* the request.
*/
privep->zlpneeded = false;
if (nbytes > privep->ep.maxpacket)
{
nbytes = privep->ep.maxpacket;
}
else if (nbytes == privep->ep.maxpacket)
{
/* If the size is exactly a full packet, then note if we need to
* send a zero length packet next.
*/
privep->zlpneeded =
((privreq->req.flags & USBDEV_REQFLAGS_NULLPKT) != 0);
}
/* This is the new number of bytes "in-flight" */
privreq->inflight = nbytes;
usbtrace(TRACE_WRITE(USB_EPNO(privep->ep.eplog)), nbytes);
/* The new buffer pointer is the started of the buffer plus the number
* of bytes successfully transferred plus the number of bytes previously
* "in-flight".
*/
buf = privreq->req.buf + privreq->req.xfrd;
/* How we send packets differs for control endpoints */
regval = sam_getreg(SAM_USBHS_DEVEPTCFG(epno));
eptype = regval & USBHS_DEVEPTCFG_EPTYPE_MASK;
if (eptype == USBHS_DEVEPTCFG_EPTYPE_CTRL)
{
sam_ctrlep_write(privep, buf, nbytes);
}
else
{
sam_ep_write(privep, buf, nbytes);
}
}
/****************************************************************************
*
* Name: sam_req_write
*
* Description:
* Process the next queued write request. This function is called in one
* of three contexts:
* (1) When the endpoint is IDLE and a new write request
* is submitted (with interrupts disabled),
* (2) from interrupt handling when the current
* transfer completes (either DMA or FIFO), or
* (3) when resuming a stalled IN or control endpoint.
*
* Calling rules:
*
* The transfer state must IDLE
*
* When a request is queued, the request 'len' is the number of bytes
* to transfer and 'xfrd' and 'inflight' must be zero.
*
* When this function starts a transfer it will update the request
* 'inflight' field to indicate the size of the transfer.
*
* When the transfer completes, the 'inflight' field must hold the
* number of bytes that have completed the transfer. This function will
* update 'xfrd' with the new size of the transfer.
*
****************************************************************************/
static int sam_req_write(struct sam_usbdev_s *priv, struct sam_ep_s *privep)
{
struct sam_req_s *privreq;
uint32_t regval;
uint32_t eptype;
uint8_t epno;
int bytesleft;
/* Get the unadorned endpoint number */
epno = USB_EPNO(privep->ep.eplog);
/* We get here when an IN endpoint interrupt occurs. So now we know that
* there is no TX transfer in progress.
*/
while (privep->epstate == USBHS_EPSTATE_IDLE)
{
/* Check the request from the head of the endpoint request queue */
privreq = sam_rqpeek(&privep->reqq);
if (!privreq)
{
/* There is no TX transfer in progress and no new pending TX
* requests to send.
*/
usbtrace(TRACE_INTDECODE(SAM_TRACEINTID_EPINQEMPTY), 0);
/* Get the endpoint type */
regval = sam_getreg(SAM_USBHS_DEVEPTCFG(epno));
eptype = regval & USBHS_DEVEPTCFG_EPTYPE_MASK;
/* Disable interrupts on non-control endpoints */
if (eptype != USBHS_DEVEPTCFG_EPTYPE_CTRL)
{
sam_putreg(USBHS_DEVINT_PEP(epno), SAM_USBHS_DEVIDR);
}
/* Clear and Disable the TXIN interrupt */
sam_putreg(USBHS_DEVEPTINT_TXINI, SAM_USBHS_DEVEPTICR(epno));
sam_putreg(USBHS_DEVEPTINT_TXINI, SAM_USBHS_DEVEPTIDR(epno));
return -ENOENT;
}
uinfo("epno=%d req=%p: len=%zu xfrd=%zu inflight=%d zlpneeded=%d\n",
epno, privreq, privreq->req.len, privreq->req.xfrd,
privreq->inflight, privep->zlpneeded);
/* Handle any bytes in flight. */
privreq->req.xfrd += privreq->inflight;
privreq->inflight = 0;
/* Get the number of bytes left to be sent in the packet */
bytesleft = privreq->req.len - privreq->req.xfrd;
if (bytesleft > 0)
{
/* The way that we handle the transfer is going to depend on
* whether or not this endpoint supports DMA. In either case
* the endpoint state will transition to SENDING.
*/
if ((SAM_EPSET_DMA & SAM_EP_BIT(epno)) != 0)
{
sam_dma_wrsetup(priv, privep, privreq);
}
else
{
sam_req_wrsetup(priv, privep, privreq);
}
}
/* No data to send... This can happen on one of two ways:
* (1) The last packet sent was the final packet of a transfer.
* If it was also exactly maxpacketsize and the protocol expects
* a zero length packet to follow then privep->zlpneeded will be
* set. Or (2) we called with a request packet that has
* len == 0 (privep->zlpneeded will not be set). Either case
* means that it is time to send a zero length packet and complete
* this transfer.
*/
else if ((privreq->req.len == 0 ||
privep->zlpneeded) & !privep->zlpsent)
{
/* If we get here, then we sent the last of the data on the
* previous pass and we need to send the zero length packet now.
*
* A Zero Length Packet can be sent by clearing just the FIFOCON
* flag in the USBHS_DEVTEPTIDRx register
*/
privep->epstate = USBHS_EPSTATE_SENDING;
privep->zlpneeded = false;
privep->zlpsent = true;
privreq->inflight = 0;
/* Initiate the zero length transfer and configure to receive the
* transfer complete interrupt.
*/
sam_ep_fifocon(epno);
}
/* If all of the bytes were sent (including any final zero length
* packet) then we are finished with the request buffer and we can
* return the request buffer to the class driver. The state will
* remain IDLE only if nothing else was put in flight.
*
* Note that we will then loop to check to check the next queued
* write request.
*/
if (privep->epstate == USBHS_EPSTATE_IDLE)
{
/* Return the write request to the class driver */
usbtrace(TRACE_COMPLETE(USB_EPNO(privep->ep.eplog)),
privreq->req.xfrd);
DEBUGASSERT(privreq->req.len == privreq->req.xfrd);
sam_req_complete(privep, OK);
}
}
return OK;
}
/****************************************************************************
*
* Name: sam_req_rddone
*
* Description:
* The last non-DMA OUT transfer has completed. Read 'recvsize' byts from
* the FIFO into the read request buffer.
*
****************************************************************************/
static void sam_req_rddone(struct sam_usbdev_s *priv,
struct sam_ep_s *privep,
struct sam_req_s *privreq, uint16_t recvsize)
{
const uint8_t *fifo;
uint8_t *dest;
int remaining;
int readlen;
int epno;
/* Get the number of bytes that can be received. This is the size of the
* user-provided request buffer, minus the number of bytes already
* transferred to the user-buffer.
*/
remaining = privreq->req.len - privreq->req.xfrd;
/* Read the smaller of the number of bytes available in FIFO and the
* size remaining in the request buffer provided by the caller.
*/
readlen = MIN(remaining, recvsize);
privreq->req.xfrd += readlen;
/* Get the source and destination transfer addresses */
epno = USB_EPNO(privep->ep.eplog);
fifo = (const uint8_t *)
((uint32_t *)SAM_USBHSRAM_BASE + (EPT_FIFO_SIZE * epno));
dest = privreq->req.buf + privreq->req.xfrd;
/* Retrieve packet from the FIFO */
for (; readlen > 0; readlen--)
{
*dest++ = *fifo++;
}
UP_MB();
}
/****************************************************************************
*
* Name: sam_req_rdenable
*
* Description:
* Make sure that the endpoint RXRDY_TXTK interrupt is enabled in order
* to receive the next incoming packet
*
****************************************************************************/
static void sam_req_rdenable(uint8_t epno)
{
sam_putreg(USBHS_DEVINT_PEP(epno), SAM_USBHS_DEVIER);
sam_putreg(USBHS_DEVEPTINT_RXOUTI, SAM_USBHS_DEVEPTIER(epno));
}
/****************************************************************************
*
* Name: sam_req_rddisable
*
* Description:
* Disable endpoint interrupts
*
****************************************************************************/
static void sam_req_rddisable(uint8_t epno)
{
sam_putreg(USBHS_DEVINT_PEP(epno), SAM_USBHS_DEVIDR);
sam_putreg(USBHS_DEVEPTINT_RXOUTI, SAM_USBHS_DEVEPTIDR(epno));
}
/****************************************************************************
*
* Name: sam_req_read
*
* Description:
* Complete the last read request, return the read request to the class
* implementation, and try to started the next queued read request.
*
* This function is called in one of three contexts: (1) When the endpoint
* is IDLE and a new read request is submitted (with interrupts disabled),
* (2) from interrupt handling when the current transfer completes (either
* DMA or FIFO), or (3) when resuming a stalled OUT or control endpoint.
*
* There is a fundamental difference between receiving packets via DMA and
* via the FIFO:
*
* - When receiving data via DMA, then data has already been transferred
* and this function is called on the terminating event. The transfer
* is complete and we just need to check for end of request events and
* if we need to setup the transfer for the next request.
* - When receiving via the FIFO, the transfer is not complete. The
* data is in the FIFO and must be transferred from the FIFO to the
* request buffer. No setup is needed for the next transfer other than
* assuring that the endpoint RXRDY_TXTK interrupt is enabled.
*
* Calling rules:
*
* The transfer state must IDLE
*
* When a request is queued, the request 'len' is size of the request
* buffer. Any OUT request can be received that will fit in this
* buffer. 'xfrd' and 'inflight' in the request must be zero
* If sam_req_read() is called to start a new transfer, the recvsize
* parameter must be zero.
*
* When this function starts a DMA transfer it will update the request
* 'inflight' field to hold the maximum size of the transfer; but
* 'inflight' is not used with FIFO transfers.
*
* When the transfer completes, the 'recvsize' parameter must be the
* size of the transfer that just completed. For the case of DMA,
* that is the size of the DMA transfer that has just been written to
* memory; for the FIFO transfer, recvsize is the number of bytes
* waiting in the FIFO to be read.
*
****************************************************************************/
static int sam_req_read(struct sam_usbdev_s *priv, struct sam_ep_s *privep,
uint16_t recvsize)
{
struct sam_req_s *privreq;
uint32_t regval;
uint32_t eptype;
uint8_t epno;
DEBUGASSERT(priv && privep && privep->epstate == USBHS_EPSTATE_IDLE);
/* Loop in case we need to handle multiple read requests */
while (privep->epstate == USBHS_EPSTATE_IDLE)
{
/* Check the request from the head of the endpoint request queue */
epno = USB_EPNO(privep->ep.eplog);
privreq = sam_rqpeek(&privep->reqq);
if (!privreq)
{
/* No packet to receive data */
usbtrace(TRACE_INTDECODE(SAM_TRACEINTID_EPOUTQEMPTY), epno);
return -ENOENT;
}
uinfo("EP%d: len=%zu xfrd=%zu\n",
epno, privreq->req.len, privreq->req.xfrd);
/* Ignore any attempt to receive a zero length packet */
if (privreq->req.len == 0)
{
usbtrace(TRACE_DEVERROR(SAM_TRACEERR_EPOUTNULLPACKET), 0);
sam_req_complete(privep, OK);
recvsize = 0;
continue;
}
usbtrace(TRACE_READ(USB_EPNO(privep->ep.eplog)), recvsize);
/* Update the number of bytes transferred with the received size */
privreq->req.xfrd += recvsize;
privreq->inflight = 0;
/* If this was not a DMA transfer,
* read the incoming data from the FIFO
*/
if ((SAM_EPSET_DMA & SAM_EP_BIT(epno)) == 0)
{
sam_req_rddone(priv, privep, privreq, recvsize);
}
/* In case we go through the loop again */
recvsize = 0;
/* If nothing has yet be transferred into the read request, then
* indicate that we are in the RECEIVING state and, if the endpoint
* supports DMA, setup the receive DMA.
*/
if (privreq->req.xfrd == 0)
{
/* Set the RECEIVING state */
privep->epstate = USBHS_EPSTATE_RECEIVING;
/* If the endpoint supports DMA, set up the DMA now */
if ((SAM_EPSET_DMA & SAM_EP_BIT(epno)) != 0)
{
/* Set up the next DMA. We will come through this logic path
* again with xrfd != 0 when the DMA completes.
*/
sam_dma_rdsetup(priv, privep, privreq);
}
/* No DMA for this endpoint and we have an available, empty read
* request. We need to wait for data to become available.
*/
else
{
/* Enable endpoint RXRDY_TXTK interrupts */
sam_req_rdenable(epno);
}
}
/* We will not try to accumulate packet data here. If anything
* has been received, we will complete the transfer immediately and
* give the data to the class driver. The idea is that we will let the
* receiving be in-charge if incoming buffer.
*/
else
{
/* Return the read request to the class driver. */
usbtrace(TRACE_COMPLETE(epno), privreq->req.xfrd);
sam_putreg(USBHS_DEVEPTINT_RXOUTI, SAM_USBHS_DEVEPTIDR(epno));
/* Get the endpoint type */
regval = sam_getreg(SAM_USBHS_DEVEPTCFG(epno));
eptype = regval & USBHS_DEVEPTCFG_EPTYPE_MASK;
/* Disable endpoint interrupts if not the control endpoint */
if (eptype != USBHS_DEVEPTCFG_EPTYPE_CTRL)
{
sam_req_rddisable(epno);
}
/* And complete the request */
privep->epstate = USBHS_EPSTATE_IDLE;
sam_req_complete(privep, OK);
}
}
return OK;
}
/****************************************************************************
*
* Name: sam_req_cancel
*
****************************************************************************/
static void sam_req_cancel(struct sam_ep_s *privep, int16_t result)
{
uint32_t regval;
uint8_t epno;
/* Disable endpoint interrupts if not endpoint 0 */
epno = USB_EPNO(privep->ep.eplog);
if (epno != 0)
{
regval = USBHS_DEVINT_DMA(epno) | USBHS_DEVINT_PEP(epno);
sam_putreg(regval, SAM_USBHS_DEVIDR);
}
/* Then complete every queued request with the specified status */
while (!sam_rqempty(&privep->reqq))
{
usbtrace(TRACE_COMPLETE(USB_EPNO(privep->ep.eplog)),
(sam_rqpeek(&privep->reqq))->req.xfrd);
sam_req_complete(privep, result);
}
}
/****************************************************************************
*
* Interrupt Level Processing
*
****************************************************************************/
/****************************************************************************
*
* Name: sam_ep0_read
*
* Description:
* Read a general USB request from the USBHS FIFO
*
****************************************************************************/
static void sam_ep0_read(uint8_t *buffer, size_t buflen)
{
volatile const uint8_t *fifo;
/* Retrieve packet from the FIFO */
fifo = (volatile const uint8_t *)SAM_USBHSRAM_BASE;
for (; buflen > 0; buflen--)
{
*buffer++ = *fifo++;
}
UP_MB();
}
/****************************************************************************
*
* Name: sam_ctrlep_write
*
* Description:
* Process the next queued write request for a control endpoint.
*
****************************************************************************/
static void sam_ctrlep_write(struct sam_ep_s *privep, const uint8_t *buffer,
size_t buflen)
{
volatile uint8_t *fifo;
unsigned int epno;
/* Get the endpoint number */
epno = USB_EPNO(privep->ep.eplog);
/* Write packet in the FIFO buffer */
fifo = (uint8_t *)
((uint32_t *)SAM_USBHSRAM_BASE + (EPT_FIFO_SIZE * epno));
for (; buflen > 0; buflen--)
{
*fifo++ = *buffer++;
}
UP_MB();
/* Indicate that there is data in the TX packet memory. This will
* be cleared when the next NAKIN interrupt is received.
*/
privep->epstate = USBHS_EPSTATE_SENDING;
/* The FIFO Control (USBHS_DEVEPTIMRx.FIFOCON) bit and the Read/Write
* Allowed (USBHS_DEVEPTISRx.RWALL) bit are irrelevant for control
* endpoints. The user never uses them on these endpoints.
*/
/* USBHS_DEVEPTISRx.TXINI is cleared by software (by writing a one to
* the Transmitted IN Data Interrupt Clear bit (USBHS_DEVEPTIDRx.TXINIC)
* to acknowledge the interrupt, which has no effect on the endpoint
* FIFO. This acknowledges the interrupt and sends the packet.
*/
sam_putreg(USBHS_DEVEPTINT_TXINI, SAM_USBHS_DEVEPTIDR(epno));
/* Clear the NAKIN bit to stop NAKing IN tokens from the host. We now
* have data ready to go.
*/
sam_putreg((USBHS_DEVEPTINT_NAKINI | USBHS_DEVEPTINT_TXINI),
SAM_USBHS_DEVEPTICR(epno));
/* Enable the TXIN interrupt on the endpoint */
sam_putreg(USBHS_DEVEPTINT_TXINI, SAM_USBHS_DEVEPTIER(epno));
}
/****************************************************************************
*
* Name: sam_ep_write
*
* Description:
* Process the next queued write request for a control endpoint.
*
****************************************************************************/
static void sam_ep_write(struct sam_ep_s *privep, const uint8_t *buffer,
size_t buflen)
{
volatile uint8_t *fifo;
unsigned int epno;
/* Get the endpoint number */
epno = USB_EPNO(privep->ep.eplog);
/* Write packet in the FIFO buffer */
fifo = (uint8_t *)
((uint32_t *)SAM_USBHSRAM_BASE + (EPT_FIFO_SIZE * epno));
for (; buflen; buflen--)
{
*fifo++ = *buffer++;
}
UP_MB();
/* Indicate that there is data in the TX packet memory. This will
* be cleared when the next data out interrupt is received.
*/
privep->epstate = USBHS_EPSTATE_SENDING;
/* Initiate the transfer and configure to receive the transfer complete
* interrupt.
*/
sam_ep_fifocon(epno);
}
/****************************************************************************
*
* Name: sam_ep0_dispatch
*
****************************************************************************/
static void sam_ep0_dispatch(struct sam_usbdev_s *priv)
{
uint8_t *dataout;
size_t outlen;
int ret;
usbtrace(TRACE_INTDECODE(SAM_TRACEINTID_DISPATCH), 0);
if (priv && priv->driver)
{
/* Assume IN SETUP (or OUT SETUP with no data) */
dataout = NULL;
outlen = 0;
/* Was this an OUT SETUP command? */
if (USB_REQ_ISOUT(priv->ctrl.type))
{
uint16_t tmplen = GETUINT16(priv->ctrl.len);
if (tmplen > 0)
{
dataout = priv->ep0out;
outlen = tmplen;
}
}
/* Forward to the control request to the class driver implementation */
ret = CLASS_SETUP(priv->driver, &priv->usbdev, &priv->ctrl,
dataout, outlen);
if (ret < 0)
{
/* Stall on failure */
usbtrace(TRACE_DEVERROR(SAM_TRACEERR_DISPATCHSTALL), 0);
sam_ep_stall(&priv->eplist[EP0].ep, false);
}
}
}
/****************************************************************************
*
* Name: sam_ep0_setup
*
****************************************************************************/
static void sam_ep0_setup(struct sam_usbdev_s *priv)
{
struct sam_ep_s *ep0 = &priv->eplist[EP0];
struct sam_ep_s *privep;
union wb_u value;
union wb_u index;
union wb_u len;
union wb_u response;
enum sam_ep0setup_e ep0result;
uint32_t regval;
uint8_t epno;
int nbytes = 0; /* Assume zero-length packet */
int ret;
/* We want to pass pointer to response.b to sam_ctrlep_write function.
* Memset the union to avoid compilation warnings of uninitialized
* variable.
*/
memset(&response, 0, sizeof(union wb_u));
/* Terminate any pending requests */
sam_req_cancel(ep0, -EPROTO);
/* Assume NOT stalled; no TX in progress */
ep0->stalled = 0;
ep0->epstate = USBHS_EPSTATE_IDLE;
/* And extract the little-endian 16-bit values to host order */
value.w = GETUINT16(priv->ctrl.value);
index.w = GETUINT16(priv->ctrl.index);
len.w = GETUINT16(priv->ctrl.len);
uinfo("SETUP: type=%02x req=%02x value=%04x index=%04x len=%04x\n",
priv->ctrl.type, priv->ctrl.req, value.w, index.w, len.w);
/* Dispatch any non-standard requests */
if ((priv->ctrl.type & USB_REQ_TYPE_MASK) != USB_REQ_TYPE_STANDARD)
{
usbtrace(TRACE_INTDECODE(SAM_TRACEINTID_NOSTDREQ), priv->ctrl.type);
/* Let the class implementation handle all non-standar requests */
sam_ep0_dispatch(priv);
return;
}
/* Handle standard request. Pick off the things of interest to the
* USB device controller driver; pass what is left to the class driver
*/
ep0result = USBHS_EP0SETUP_SUCCESS;
switch (priv->ctrl.req)
{
case USB_REQ_GETSTATUS:
{
/* type: device-to-host; recipient = device, interface, endpoint
* value: 0
* index: zero interface endpoint
* len: 2; data = status
*/
usbtrace(TRACE_INTDECODE(SAM_TRACEINTID_GETSTATUS), priv->ctrl.type);
if (len.w != 2 || (priv->ctrl.type & USB_REQ_DIR_IN) == 0 ||
index.b[MSB] != 0 || value.w != 0)
{
usbtrace(TRACE_DEVERROR(SAM_TRACEERR_BADEPGETSTATUS), 0);
ep0result = USBHS_EP0SETUP_STALL;
}
else
{
switch (priv->ctrl.type & USB_REQ_RECIPIENT_MASK)
{
case USB_REQ_RECIPIENT_ENDPOINT:
{
epno = USB_EPNO(index.b[LSB]);
usbtrace(TRACE_INTDECODE(SAM_TRACEINTID_EPGETSTATUS),
epno);
if (epno >= SAM_USBHS_NENDPOINTS)
{
usbtrace(TRACE_DEVERROR(SAM_TRACEERR_BADEPGETSTATUS),
epno);
ep0result = USBHS_EP0SETUP_STALL;
}
else
{
privep = &priv->eplist[epno];
response.w = 0; /* Not stalled */
nbytes = 2; /* Response size: 2 bytes */
if (privep->stalled)
{
/* Endpoint stalled */
response.b[LSB] = 1; /* Stalled */
}
}
}
break;
case USB_REQ_RECIPIENT_DEVICE:
{
if (index.w == 0)
{
usbtrace(TRACE_INTDECODE(SAM_TRACEINTID_DEVGETSTATUS),
0);
/* Features: Remote Wakeup=YES; selfpowered=? */
response.w = 0;
response.b[LSB] = (priv->selfpowered <<
USB_FEATURE_SELFPOWERED) |
(1 << USB_FEATURE_REMOTEWAKEUP);
nbytes = 2; /* Response size: 2 bytes */
}
else
{
usbtrace(TRACE_DEVERROR(SAM_TRACEERR_BADDEVGETSTATUS),
0);
ep0result = USBHS_EP0SETUP_STALL;
}
}
break;
case USB_REQ_RECIPIENT_INTERFACE:
{
usbtrace(TRACE_INTDECODE(SAM_TRACEINTID_IFGETSTATUS),
0);
response.w = 0;
nbytes = 2; /* Response size: 2 bytes */
}
break;
default:
{
usbtrace(TRACE_DEVERROR(SAM_TRACEERR_BADGETSTATUS),
0);
ep0result = USBHS_EP0SETUP_STALL;
}
break;
}
}
}
break;
case USB_REQ_CLEARFEATURE:
{
/* type: host-to-device; recipient = device, interface or endpoint
* value: feature selector
* index: zero interface endpoint;
* len: zero, data = none
*/
usbtrace(TRACE_INTDECODE(SAM_TRACEINTID_CLEARFEATURE),
priv->ctrl.type);
if ((priv->ctrl.type & USB_REQ_RECIPIENT_MASK) !=
USB_REQ_RECIPIENT_ENDPOINT)
{
/* Let the class implementation handle all
* recipients (except for the endpoint recipient)
*/
sam_ep0_dispatch(priv);
ep0result = USBHS_EP0SETUP_DISPATCHED;
}
else
{
/* Endpoint recipient */
epno = USB_EPNO(index.b[LSB]);
if (epno < SAM_USBHS_NENDPOINTS && index.b[MSB] == 0 &&
value.w == USB_FEATURE_ENDPOINTHALT && len.w == 0)
{
privep = &priv->eplist[epno];
privep->halted = 0;
ret = sam_ep_stall(&privep->ep, true);
if (ret < 0)
{
ep0result = USBHS_EP0SETUP_STALL;
}
}
else
{
usbtrace(TRACE_DEVERROR(SAM_TRACEERR_BADCLEARFEATURE), 0);
ep0result = USBHS_EP0SETUP_STALL;
}
}
}
break;
case USB_REQ_SETFEATURE:
{
/* type: host-to-device; recipient = device, interface, endpoint
* value: feature selector
* index: zero interface endpoint;
* len: 0; data = none
*/
usbtrace(TRACE_INTDECODE(SAM_TRACEINTID_SETFEATURE),
priv->ctrl.type);
if (((priv->ctrl.type & USB_REQ_RECIPIENT_MASK) ==
USB_REQ_RECIPIENT_DEVICE) &&
value.w == USB_FEATURE_TESTMODE)
{
/* Special case recipient=device test mode */
uinfo("test mode: %d\n", index.w);
}
else if ((priv->ctrl.type & USB_REQ_RECIPIENT_MASK) !=
USB_REQ_RECIPIENT_ENDPOINT)
{
/* The class driver handles all
* recipients except recipient=endpoint
*/
sam_ep0_dispatch(priv);
ep0result = USBHS_EP0SETUP_DISPATCHED;
}
else
{
/* Handler recipient=endpoint */
epno = USB_EPNO(index.b[LSB]);
if (epno < SAM_USBHS_NENDPOINTS && index.b[MSB] == 0 &&
value.w == USB_FEATURE_ENDPOINTHALT && len.w == 0)
{
privep = &priv->eplist[epno];
privep->halted = 1;
ret = sam_ep_stall(&privep->ep, false);
if (ret < 0)
{
ep0result = USBHS_EP0SETUP_STALL;
}
}
else
{
usbtrace(TRACE_DEVERROR(SAM_TRACEERR_BADSETFEATURE), 0);
ep0result = USBHS_EP0SETUP_STALL;
}
}
}
break;
case USB_REQ_SETADDRESS:
{
/* type: host-to-device; recipient = device
* value: device address
* index: 0
* len: 0; data = none
*/
if ((priv->ctrl.type & USB_REQ_RECIPIENT_MASK) !=
USB_REQ_RECIPIENT_DEVICE ||
index.w != 0 || len.w != 0 || value.w > 127)
{
usbtrace(TRACE_DEVERROR(SAM_TRACEERR_BADSETADDRESS), 0);
ep0result = USBHS_EP0SETUP_STALL;
}
else
{
/* Note that setting of the device address will be deferred. A
* zero-length packet will be sent and the device address will
* be set when the zero-length packet transfer completes.
*/
usbtrace(TRACE_INTDECODE(SAM_TRACEINTID_EP0SETUPSETADDRESS),
value.w);
/* Write this address to the USB Address
* (USBHS_DEVCTRL.UADD) field
* but do not yet enable (USBHS_DEVCTRL.ADDEN)
* so the actual address is still 0.
*
* USBHS_DEVCTRL.UADD and USBHS_DEVCTRL.ADDEN
* must not be written all at once.
*/
regval = sam_getreg(SAM_USBHS_DEVCTRL);
regval &= ~(USBHS_DEVCTRL_UADD_MASK | USBHS_DEVCTRL_ADDEN);
regval |= USBHS_DEVCTRL_UADD(value.w);
sam_putreg(regval, SAM_USBHS_DEVCTRL);
ep0result = USBHS_EP0SETUP_ADDRESS;
}
}
break;
case USB_REQ_GETDESCRIPTOR:
/* type: device-to-host; recipient = device
* value: descriptor type and index
* index: 0 or language ID;
* len: descriptor len; data = descriptor
*/
case USB_REQ_SETDESCRIPTOR:
/* type: host-to-device; recipient = device
* value: descriptor type and index
* index: 0 or language ID;
* len: descriptor len; data = descriptor
*/
{
usbtrace(TRACE_INTDECODE(SAM_TRACEINTID_GETSETDESC),
priv->ctrl.type);
if ((priv->ctrl.type & USB_REQ_RECIPIENT_MASK) ==
USB_REQ_RECIPIENT_DEVICE)
{
/* The request seems valid...
* let the class implementation handle it
*/
sam_ep0_dispatch(priv);
ep0result = USBHS_EP0SETUP_DISPATCHED;
}
else
{
usbtrace(TRACE_DEVERROR(SAM_TRACEERR_BADGETSETDESC), 0);
ep0result = USBHS_EP0SETUP_STALL;
}
}
break;
case USB_REQ_GETCONFIGURATION:
/* type: device-to-host; recipient = device
* value: 0;
* index: 0;
* len: 1; data = configuration value
*/
{
usbtrace(TRACE_INTDECODE(SAM_TRACEINTID_GETCONFIG),
priv->ctrl.type);
if ((priv->ctrl.type & USB_REQ_RECIPIENT_MASK) ==
USB_REQ_RECIPIENT_DEVICE &&
value.w == 0 && index.w == 0 && len.w == 1)
{
/* The request seems valid...
* let the class implementation handle it
*/
sam_ep0_dispatch(priv);
ep0result = USBHS_EP0SETUP_DISPATCHED;
}
else
{
usbtrace(TRACE_DEVERROR(SAM_TRACEERR_BADGETCONFIG), 0);
ep0result = USBHS_EP0SETUP_STALL;
}
}
break;
case USB_REQ_SETCONFIGURATION:
/* type: host-to-device; recipient = device
* value: configuration value
* index: 0;
* len: 0; data = none
*/
{
usbtrace(TRACE_INTDECODE(SAM_TRACEINTID_SETCONFIG),
priv->ctrl.type);
if ((priv->ctrl.type & USB_REQ_RECIPIENT_MASK) ==
USB_REQ_RECIPIENT_DEVICE &&
index.w == 0 && len.w == 0)
{
/* The request seems valid...
* let the class implementation handle it.
* If the class implementation accespts
* it new configuration, it will
* call sam_ep_configure() to configure the endpoints.
*/
sam_ep0_dispatch(priv);
ep0result = USBHS_EP0SETUP_DISPATCHED;
}
else
{
usbtrace(TRACE_DEVERROR(SAM_TRACEERR_BADSETCONFIG), 0);
ep0result = USBHS_EP0SETUP_STALL;
}
}
break;
case USB_REQ_GETINTERFACE:
/* type: device-to-host; recipient = interface
* value: 0
* index: interface;
* len: 1; data = alt interface
*/
case USB_REQ_SETINTERFACE:
/* type: host-to-device; recipient = interface
* value: alternate setting
* index: interface;
* len: 0; data = none
*/
{
/* Let the class implementation handle the request */
usbtrace(TRACE_INTDECODE(SAM_TRACEINTID_GETSETIF), priv->ctrl.type);
sam_ep0_dispatch(priv);
ep0result = USBHS_EP0SETUP_DISPATCHED;
}
break;
case USB_REQ_SYNCHFRAME:
/* type: device-to-host; recipient = endpoint
* value: 0
* index: endpoint;
* len: 2; data = frame number
*/
{
usbtrace(TRACE_INTDECODE(SAM_TRACEINTID_SYNCHFRAME), 0);
}
break;
default:
{
usbtrace(TRACE_DEVERROR(SAM_TRACEERR_INVALIDCTRLREQ),
priv->ctrl.req);
ep0result = USBHS_EP0SETUP_STALL;
}
break;
}
/* Restrict the data length to the length requested in the setup packet */
if (nbytes > len.w)
{
nbytes = len.w;
}
/* At this point, the request has been handled and there are three
* (or four) possible outcomes:
*
* 1a. ep0result == USBHS_EP0SETUP_SUCCESS
*
* The setup request was successfully handled above and a response
* packet must be sent (may be a zero length packet).
*
* 1b. ep0result == USBHS_EP0SETUP_ADDRESS
*
* A special case is the case where epstate=USBHS_EPSTATE_EP0ADDRESS.
* This means that the above processing generated an additional state
* where we need to wait until we complete the status phase before
* applying the new device address.
*
* 2. ep0result == USBHS_EP0SETUP_DISPATCHED;
*
* The request was forwarded to the class implementation. In case,
* EP0 IN data may have already been sent and the EP0 IN response
* has already been queued? Or perhaps the endpoint has already
* been stalled? This is all under the control of the class driver.
*
* NOTE that for the case of non-standard SETUP requested, those
* requests were forwarded to the class driver and we don't even get
* to this logic.
*
* 3. ep0result == USBHS_EP0SETUP_STALL;
*
* An error was detected in either the above logic or by the class
* implementation logic.
*/
switch (ep0result)
{
case USBHS_EP0SETUP_SUCCESS:
{
/* Send the response (might be a zero-length packet) */
sam_ctrlep_write(ep0, response.b, nbytes);
ep0->epstate = USBHS_EPSTATE_EP0STATUSIN;
}
break;
case USBHS_EP0SETUP_ADDRESS:
{
/* Send the response (might be a zero-length packet) */
sam_ctrlep_write(ep0, response.b, nbytes);
ep0->epstate = USBHS_EPSTATE_EP0ADDRESS;
}
break;
case USBHS_EP0SETUP_STALL:
{
/* Stall EP0 */
usbtrace(TRACE_DEVERROR(SAM_TRACEERR_EP0SETUPSTALLED),
priv->ctrl.req);
sam_ep_stall(&priv->eplist[EP0].ep, false);
}
break;
case USBHS_EP0SETUP_DISPATCHED:
default:
break;
}
}
/****************************************************************************
*
* Name: sam_dma_interrupt
*
* Description:
* Handle the USBHS DMA interrupt
*
****************************************************************************/
#ifdef CONFIG_USBDEV_DMA
static void sam_dma_interrupt(struct sam_usbdev_s *priv, int epno)
{
struct sam_ep_s *privep;
struct sam_req_s *privreq;
uintptr_t regaddr;
uint32_t regval;
uint32_t dmastatus;
uint8_t *buf;
int bufcnt;
int xfrsize;
/* Not all endpoints support DMA */
DEBUGASSERT((unsigned)epno < SAM_USBHS_NENDPOINTS &&
(SAM_EPSET_DMA & SAM_EP_BIT(epno)) != 0);
/* Get the endpoint structure */
privep = &priv->eplist[epno];
/* Get the request from the head of the endpoint request queue */
privreq = sam_rqpeek(&privep->reqq);
DEBUGASSERT(privreq);
/* Disable DMA interrupt to avoid receiving 2 (B_EN and TR_EN) */
regaddr = SAM_USBHS_DEVDMACTRL(epno);
regval = sam_getreg(regaddr);
regval &= ~(USBHS_DEVDMACTRL_ENDTREN | USBHS_DEVDMACTRL_ENDBEN);
sam_putreg(regval, regaddr);
/* Get the result of the DMA operation */
dmastatus = sam_getreg(SAM_USBHS_DEVDMASTA(epno));
usbtrace(TRACE_INTDECODE(SAM_TRACEINTID_EPDMAINT), dmastatus);
/* Disable DMA interrupt to avoid receiving 2 (B_EN and TR_EN) */
regaddr = SAM_USBHS_DEVDMACTRL(epno);
regval = sam_getreg(regaddr);
regval &= ~(USBHS_DEVDMACTRL_ENDTREN | USBHS_DEVDMACTRL_ENDBEN);
sam_putreg(regval, regaddr);
/* Check for end of the buffer. Set by hardware when the BUFF_COUNT
* downcount reaches zero. This could be either an IN or OUT transfer.
*/
if ((dmastatus & USBHS_DEVDMASTA_ENDBUFFST) != 0)
{
usbtrace(TRACE_INTDECODE(SAM_TRACEINTID_DMAEOB), (uint16_t)dmastatus);
/* BUFF_COUNT holds the number of untransmitted bytes. BUFF_COUNT is
* equal to zero in case of good transfer. BUFF_COUNT was set to
* the 'inflight' count when the DMA started and the BUFF_COUNT has
* now decremented to zero
*/
/* This is just debug logic that only does any if USB debug or tracing
* are enabled. This just verifies that BUFF_COUNT is zero.
*/
bufcnt = (dmastatus & USBHS_DEVDMASTA_BUFCNT_MASK)
>> USBHS_DEVDMASTA_BUFCNT_SHIFT;
if (bufcnt != 0)
{
usbtrace(TRACE_DEVERROR(SAM_TRACERR_REMAINING), bufcnt);
}
/* Were we sending? Or receiving? */
if (privep->epstate == USBHS_EPSTATE_SENDING ||
privep->epstate == USBHS_EPSTATE_SENDING_DMA)
{
uint32_t nbusybk;
uint32_t byct;
/* This is an IN endpoint. Continuing processing the write
* request.
*/
DEBUGASSERT(USB_ISEPIN(privep->ep.eplog));
/* Assume that will wait for the NBUSYBKS interrupt. Enable it
* now. We do this PRIOR to sampling the BYCT and BUSBK
* fields to avoid the race condition that would occur if
* the interrupt were enabled afterward.
*/
sam_putreg(USBHS_DEVEPTINT_NBUSYBKI, SAM_USBHS_DEVEPTIER(epno));
/* Have all of the bytes in the FIFO been transmitted to the
* host?
*
* BYCT == 0 Means that all of the data has been transferred
* out of the FIFO.
* Warning: This field may be updated one clock cycle
* after the RWALL bit changes, so the user should not
* poll this field as an interrupt bit.
* NBUSYBK == 0 Indicates that all banks that have been sent to
* the host.
*/
regval = sam_getreg(SAM_USBHS_DEVEPTISR(epno));
byct = (regval & USBHS_DEVEPTISR_BYCT_MASK) >>
USBHS_DEVEPTISR_BYCT_SHIFT;
nbusybk = (regval & USBHS_DEVEPTISR_NBUSYBK_MASK) >>
USBHS_DEVEPTISR_NBUSYBK_SHIFT;
if (byct > 0 || nbusybk > 0)
{
/* Not all of the data has been sent to the host.
* A NBUSYBKE interrupt will be generated later.
* It has already been enabled.
* Now wait for the transfer to complete.
*/
privep->epstate = USBHS_EPSTATE_NBUSYBK;
}
else
{
/* All bytes have been sent to the host. We must call
* sam_req_write() now in the IDLE state with the number of
* bytes transferred in 'inflight'. There must not be a
* pending TXIN interrupt when sam_req_write() is called.
*/
sam_putreg(USBHS_DEVEPTINT_NBUSYBKI,
SAM_USBHS_DEVEPTIDR(epno));
sam_putreg(USBHS_DEVEPTINT_TXINI, SAM_USBHS_DEVEPTICR(epno));
privep->epstate = USBHS_EPSTATE_IDLE;
sam_req_write(priv, privep);
}
}
else if (privep->epstate == USBHS_EPSTATE_RECEIVING)
{
/* privreg->inflight holds the total transfer size */
xfrsize = privreq->inflight;
privreq->inflight = 0;
/* This is an OUT endpoint. Invalidate the data cache for
* region that just completed DMA. This will force the
* buffer data to be reloaded from RAM when it is accessed.
*
* REVISIT: If the buffer is not aligned to the cacheline
* size the cached data might be lost at the boundaries.
*/
DEBUGASSERT(USB_ISEPOUT(privep->ep.eplog));
buf = &privreq->req.buf[privreq->req.xfrd];
up_invalidate_dcache((uintptr_t)buf, (uintptr_t)buf + xfrsize);
/* Complete this transfer, return the request to the class
* implementation, and try to start the next, queue read request.
* We must call sam_req_read in the IDLE state, 'inflight' is
* ignored (should be zero) and the transfer size is passed as
* an argument to sam_req_read().
*/
privep->epstate = USBHS_EPSTATE_IDLE;
sam_req_read(priv, privep, xfrsize);
}
else
{
usbtrace(TRACE_DEVERROR(SAM_TRACEERR_BADEOBSTATE), bufcnt);
}
}
/* Check for end of channel transfer. END_TR_ST is set by hardware when
* the last packet transfer is complete if END_TR_EN is set in the
* DMACONTROL register. The request is complete.
*
* "Used for OUT transfers only.
*
* "0 = USB end of transfer is ignored.
* "1 = USBHS device can put an end to the current buffer transfer.
*
* "When set, a BULK or INTERRUPT short packet or the last packet of
* an ISOCHRONOUS (micro) frame (DATAX) will close the current buffer
* and the USBHS_DMASTATUSx register END_TR_ST flag will be raised."
*/
else if ((dmastatus & USBHS_DEVDMASTA_ENDTRST) != 0)
{
usbtrace(TRACE_INTDECODE(SAM_TRACEINTID_DMAEOC), (uint16_t)dmastatus);
DEBUGASSERT(privep->epstate == USBHS_EPSTATE_RECEIVING &&
USB_ISEPOUT(privep->ep.eplog));
/* Get the number of bytes transferred from the DMA status.
*
* BUFF_COUNT holds the number of untransmitted bytes. In this case,
* BUFF_COUNT should not be zero. BUFF_COUNT was set to the
* 'inflight' count when the DMA started so the difference will
* give us the actual size of the transfer.
*/
bufcnt = ((dmastatus & USBHS_DEVDMASTA_BUFCNT_MASK)
>> USBHS_DEVDMASTA_BUFCNT_SHIFT);
xfrsize = privreq->inflight - bufcnt;
privreq->inflight = 0;
/* Invalidate the data cache for region that just completed DMA.
* This will force the buffer data to be reloaded from RAM.
*
* REVISIT: If the buffer is not aligned to the cacheline size the
* cached data might be lost at the boundaries.
*/
buf = &privreq->req.buf[privreq->req.xfrd];
up_invalidate_dcache((uintptr_t)buf, (uintptr_t)buf + xfrsize);
/* Complete this transfer, return the request to the class
* implementation, and try to start the next, queue read request.
*/
privep->epstate = USBHS_EPSTATE_IDLE;
sam_req_read(priv, privep, xfrsize);
}
else
{
usbtrace(TRACE_DEVERROR(SAM_TRACEERR_DMAERR), (uint16_t)dmastatus);
/* Return the request buffer to the class implementation with the I/O
* error indication.
*/
sam_req_complete(privep, -EIO);
}
}
#endif
/****************************************************************************
*
* Name: sam_ep_interrupt
*
* Description:
* Handle the USBHS endpoint interrupt
*
****************************************************************************/
static void sam_ep_interrupt(struct sam_usbdev_s *priv, int epno)
{
struct sam_ep_s *privep;
uint32_t eptisr;
uint32_t eptype;
uint32_t regval;
uint16_t pktsize;
DEBUGASSERT((unsigned)epno < SAM_USBHS_NENDPOINTS);
/* Get the endpoint structure */
privep = &priv->eplist[epno];
/* Get the endpoint status */
eptisr = sam_getreg(SAM_USBHS_DEVEPTISR(epno));
usbtrace(TRACE_INTDECODE(SAM_TRACEINTID_EPINT), eptisr);
/* Get the endpoint type */
regval = sam_getreg(SAM_USBHS_DEVEPTCFG(epno));
eptype = regval & USBHS_DEVEPTCFG_EPTYPE_MASK;
#ifdef CONFIG_USBDEV_DMA
/* Check for IN DMA packet sent and NBUSYBKS transitioning to zero. This
* is the USBHS_DEVEPTINT_NBUSYBKI interrupt. There is no indication of
* the pending USBHS_DEVEPTINT_NBUSYBKI in the status register. We depend
* on (a) NBUSYBKS == 0, and (c) state == USBHS_EPSTATE_NBUSYBK.
*/
if ((eptisr & USBHS_DEVEPTISR_NBUSYBK_MASK) == 0 &&
privep->epstate == USBHS_EPSTATE_NBUSYBK)
{
/* Clear the pending NBUSYBKS (and TXIN) interrupts */
sam_putreg(USBHS_DEVEPTINT_TXINI | USBHS_DEVEPTINT_NBUSYBKI,
SAM_USBHS_DEVEPTICR(epno));
/* Disable further NBUSYBKS interrupts */
sam_putreg(USBHS_DEVEPTINT_NBUSYBKI, SAM_USBHS_DEVEPTIDR(epno));
/* Continue/resume processing the write requests. */
privep->epstate = USBHS_EPSTATE_IDLE;
sam_req_write(priv, privep);
}
else
#endif
/* IN packet sent */
if ((eptisr & USBHS_DEVEPTINT_TXINI) != 0 &&
(sam_getreg(SAM_USBHS_DEVEPTIMR(epno)) & USBHS_DEVEPTINT_TXINI) != 0)
{
usbtrace(TRACE_INTDECODE(SAM_TRACEINTID_TXINI), (uint16_t)eptisr);
/* Sending state. This is the completion of a "normal" write request
* transfer. In this case, we need to resume request processing in
* order to send the next outgoing packet.
*/
if (privep->epstate == USBHS_EPSTATE_SENDING ||
privep->epstate == USBHS_EPSTATE_EP0STATUSIN)
{
/* A control endpoint clears the TXIN bit after new data is written
* to the fifo inside the function "sam_ctrlep_write"
* (sam_req_write -> sam_req_wrsetup -> sam_ctrlep_write).
* All other Endpoints needs to clear the bit here.
*
* REVISIT: normally all other endpoints also have to reset the bit
* at a later point.
*
* Continue/resume processing the write requests.
*/
if (eptype != USBHS_DEVEPTCFG_EPTYPE_CTRL)
{
sam_putreg(USBHS_DEVEPTINT_TXINI, SAM_USBHS_DEVEPTICR(epno));
}
privep->epstate = USBHS_EPSTATE_IDLE;
sam_req_write(priv, privep);
}
/* Setting of the device address is a special case. The address was
* obtained when a preceding SETADDRESS SETUP command was processed.
* But the address is not set until the final SETUP status phase
* completes. This interrupt indicates the completion of that status
* phase and now we set the address.
*/
else if (privep->epstate == USBHS_EPSTATE_EP0ADDRESS)
{
DEBUGASSERT(epno == EP0);
/* Enable the address previously set in the SETUP processing.
* USBHS_DEVCTRL.UADD and USBHS_DEVCTRL.ADDEN must not be written
* all at once.
*/
regval = sam_getreg(SAM_USBHS_DEVCTRL);
regval |= USBHS_DEVCTRL_ADDEN;
sam_putreg(regval, SAM_USBHS_DEVCTRL);
usbtrace(TRACE_INTDECODE(SAM_TRACEINTID_ADDRESSED),
(regval & USBHS_DEVCTRL_UADD_MASK) <<
USBHS_DEVCTRL_UADD_SHIFT);
/* Go to the addressed state. EP0 is now IDLE. */
priv->devstate = USBHS_DEVSTATE_ADDRESSED;
privep->epstate = USBHS_EPSTATE_IDLE;
/* Acknowledge then disable the further TXIN interrupts on EP0. */
sam_putreg(USBHS_DEVEPTINT_TXINI, SAM_USBHS_DEVEPTICR(epno));
sam_putreg(USBHS_DEVEPTINT_TXINI, SAM_USBHS_DEVEPTIDR(epno));
}
else
{
usbtrace(TRACE_DEVERROR(SAM_TRACEERR_TXINERR), privep->epstate);
sam_putreg(USBHS_DEVEPTINT_TXINI, SAM_USBHS_DEVEPTICR(epno));
sam_putreg(USBHS_DEVEPTINT_TXINI, SAM_USBHS_DEVEPTIDR(epno));
}
}
/* OUT packet received */
if ((eptisr & USBHS_DEVEPTINT_RXOUTI) != 0)
{
usbtrace(TRACE_INTDECODE(SAM_TRACEINTID_RXRDY), (uint16_t)eptisr);
/* Are we receiving data for a read request? */
if (privep->epstate == USBHS_EPSTATE_RECEIVING)
{
/* Yes, get the size of the packet that we just received */
pktsize = (uint16_t)
((eptisr & USBHS_DEVEPTISR_BYCT_MASK) >>
USBHS_DEVEPTISR_BYCT_SHIFT);
/* And continue processing the read request, clearing RXOUT in
* order to receive more data.
*/
privep->epstate = USBHS_EPSTATE_IDLE;
sam_req_read(priv, privep, pktsize);
sam_putreg(USBHS_DEVEPTINT_RXOUTI, SAM_USBHS_DEVEPTICR(epno));
}
/* Did we just receive the data associated with an OUT SETUP command? */
else if (privep->epstate == USBHS_EPSTATE_EP0DATAOUT)
{
uint16_t len;
/* Yes.. back to the IDLE state */
privep->epstate = USBHS_EPSTATE_IDLE;
/* Get the size of the packet that we just received */
pktsize = (uint16_t)
((eptisr & USBHS_DEVEPTISR_BYCT_MASK) >>
USBHS_DEVEPTISR_BYCT_SHIFT);
/* Get the size that we expected to receive */
len = GETUINT16(priv->ctrl.len);
if (len == pktsize)
{
/* Copy the OUT data from the EP0 FIFO
* into a special EP0 buffer
* and clear RXOUT in order to receive more data.
*/
sam_ep0_read(priv->ep0out, len);
sam_putreg(USBHS_DEVEPTINT_RXOUTI, SAM_USBHS_DEVEPTICR(epno));
/* And handle the EP0 SETUP now. */
sam_ep0_setup(priv);
}
else
{
usbtrace(TRACE_DEVERROR(SAM_TRACEERR_EP0SETUPOUTSIZE),
pktsize);
/* STALL and discard received data. */
sam_ep_stall(&privep->ep, false);
sam_putreg(USBHS_DEVEPTINT_STALLRQI,
SAM_USBHS_DEVEPTICR(epno));
}
}
else
{
/* Check if ACK received on a Control EP */
if (eptype == USBHS_DEVEPTCFG_EPTYPE_CTRL &&
(eptisr & USBHS_DEVEPTISR_BYCT_MASK) == 0)
{
}
/* Data has been STALLed */
else if ((eptisr & USBHS_DEVEPTINT_STALLEDI) != 0)
{
}
/* NAK the data */
else
{
sam_putreg(USBHS_DEVINT_PEP(epno), SAM_USBHS_DEVIDR);
}
/* Acknowledge the interrupt. */
sam_putreg(USBHS_DEVEPTINT_RXOUTI, SAM_USBHS_DEVEPTICR(epno));
}
}
/* STALL sent */
if ((eptisr & USBHS_DEVEPTINT_STALLEDI) != 0)
{
usbtrace(TRACE_INTDECODE(SAM_TRACEINTID_STALLSNT), (uint16_t)eptisr);
/* Acknowledge */
sam_putreg(USBHS_DEVEPTINT_STALLEDI, SAM_USBHS_DEVEPTICR(epno));
/* ISO error */
if (eptype == USBHS_DEVEPTCFG_EPTYPE_ISO)
{
privep->epstate = USBHS_EPSTATE_IDLE;
sam_req_complete(privep, -EIO);
}
/* If EP is not halted, clear STALL */
else if (privep->epstate != USBHS_EPSTATE_STALLED)
{
sam_putreg(USBHS_DEVEPTINT_STALLEDI, SAM_USBHS_DEVEPTIDR(epno));
}
}
/* SETUP packet received */
if ((eptisr & USBHS_DEVEPTINT_RXSTPI) != 0)
{
usbtrace(TRACE_INTDECODE(SAM_TRACEINTID_RXSETUP), (uint16_t)eptisr);
/* If a request transfer was pending, complete it.
* Handle the case where during the status phase
* of a control write transfer, the host receives
* the device ZLP and ack it, but the ack is
* not received by the device
*/
if (privep->epstate == USBHS_EPSTATE_RECEIVING ||
privep->epstate == USBHS_EPSTATE_SENDING ||
privep->epstate == USBHS_EPSTATE_SENDING_DMA)
{
sam_req_complete(privep, -EPROTO);
}
/* ISO Err Flow */
if (eptype == USBHS_DEVEPTCFG_EPTYPE_ISO)
{
/* Acknowledge setup packet */
sam_putreg(USBHS_DEVEPTINT_RXSTPI, SAM_USBHS_DEVEPTICR(epno));
}
else
{
uint16_t len;
/* Copy setup data from the EP0 FIFO into the driver structure. */
sam_ep0_read((uint8_t *)&priv->ctrl, USB_SIZEOF_CTRLREQ);
/* Acknowledge setup packet */
sam_putreg(USBHS_DEVEPTINT_RXSTPI, SAM_USBHS_DEVEPTICR(epno));
/* Check for a SETUP IN transaction */
len = GETUINT16(priv->ctrl.len);
if (USB_REQ_ISOUT(priv->ctrl.type) && len > 0)
{
/* Yes.. then we have to wait for the OUT data phase to
* complete before processing the SETUP command.
*/
usbtrace(TRACE_INTDECODE(SAM_TRACEINTID_EP0SETUPOUT),
priv->ctrl.req);
privep->epstate = USBHS_EPSTATE_EP0DATAOUT;
}
else
{
/* This is an SETUP IN command (or a SETUP IN with no data).
* Handle the EP0 SETUP now.
*/
usbtrace(TRACE_INTDECODE(SAM_TRACEINTID_EP0SETUPIN), len);
privep->epstate = USBHS_EPSTATE_IDLE;
sam_ep0_setup(priv);
}
}
}
}
/****************************************************************************
*
* Name: sam_usbhs_interrupt
*
* Description:
* Handle the USBHS interrupt
*
****************************************************************************/
static int sam_usbhs_interrupt(int irq, void *context, void *arg)
{
/* For now there is only one USB controller,
* but we will always refer to it using a pointer
* to make any future ports to multiple
* USBHS controllers easier.
*/
struct sam_usbdev_s *priv = &g_usbhs;
uint32_t devisr;
uint32_t pending;
uint32_t regval;
int i;
/* Get the set of pending interrupts */
devisr = sam_getreg(SAM_USBHS_DEVISR);
usbtrace(TRACE_INTENTRY(SAM_TRACEINTID_INTERRUPT), devisr);
regval = sam_getreg(SAM_USBHS_DEVIMR);
pending = devisr & regval;
/* Handle all pending USBHS interrupts (and new interrupts that become
* pending)
*/
while (pending)
{
usbtrace(TRACE_INTDECODE(SAM_TRACEINTID_PENDING), (uint16_t)pending);
/* Suspend, treated last */
if (pending == USBHS_DEVINT_SUSPD)
{
usbtrace(TRACE_INTDECODE(SAM_TRACEINTID_INTSUSPD),
(uint16_t)pending);
/* Un-freeze the clock */
regval = sam_getreg(SAM_USBHS_CTRL);
regval &= ~USBHS_CTRL_FRZCLK;
sam_putreg(regval, SAM_USBHS_CTRL);
/* Disable suspend interrupts */
sam_putreg(USBHS_DEVINT_SUSPD, SAM_USBHS_DEVIDR);
/* Enable wakeup interrupts */
sam_putreg(USBHS_DEVINT_WAKEUP | USBHS_DEVINT_EORSM,
SAM_USBHS_DEVIER);
/* Acknowledge the suspend interrupt */
sam_putreg(USBHS_DEVINT_SUSPD | USBHS_DEVINT_WAKEUP,
SAM_USBHS_DEVICR);
/* Inform board logic that USB is suspended */
sam_suspend(priv);
/* Re-freeze the clock */
regval |= USBHS_CTRL_FRZCLK;
sam_putreg(regval, SAM_USBHS_CTRL);
}
/* SOF interrupt */
else if ((pending & USBHS_DEVINT_SOF) != 0)
{
/* Acknowledge interrupt */
usbtrace(TRACE_INTDECODE(SAM_TRACEINTID_INTSOF),
(uint16_t)pending);
sam_putreg(USBHS_DEVINT_SOF, SAM_USBHS_DEVICR);
}
/* MSOF interrupt */
else if ((pending & USBHS_DEVINT_MSOF) != 0)
{
/* Acknowledge interrupt */
usbtrace(TRACE_INTDECODE(SAM_TRACEINTID_INTMSOF),
(uint16_t)pending);
sam_putreg(USBHS_DEVINT_MSOF, SAM_USBHS_DEVICR);
}
/* Resume */
else if ((pending & USBHS_DEVINT_WAKEUP) != 0 ||
(pending & USBHS_DEVINT_EORSM) != 0)
{
usbtrace(TRACE_INTDECODE(SAM_TRACEINTID_WAKEUP),
(uint16_t)pending);
sam_resume(priv);
/* Un-freeze the clock */
regval = sam_getreg(SAM_USBHS_CTRL);
regval &= ~USBHS_CTRL_FRZCLK;
sam_putreg(regval, SAM_USBHS_CTRL);
/* Acknowledge interrupt */
sam_putreg(USBHS_DEVINT_WAKEUP | USBHS_DEVINT_EORSM |
USBHS_DEVINT_SUSPD, SAM_USBHS_DEVICR);
/* Disable wakeup interrupts */
sam_putreg(USBHS_DEVINT_WAKEUP, SAM_USBHS_DEVIDR);
/* Enable suspend interrupts and clear */
sam_putreg(USBHS_DEVINT_EORSM | USBHS_DEVINT_SUSPD,
SAM_USBHS_DEVIER);
}
/* End of Reset.
*
* The USB bus reset is managed by hardware.
* It is initiated by a connected host.
* When a USB reset is detected on the USB line, the following
* operations are performed by the controller:
*
* - All endpoints are disabled, except the default control endpoint.
* - The default control endpoint is reset
* - The data toggle sequence of the default control
* endpoint is cleared.
* - At the end of the reset process,
* the End of Reset (USBHS_DEVISR.EORST) bit is set.
* - During a reset, the USBHS automatically switches
* to High-speed modeif the host is High-speed-capable
* (the reset is called High-speed reset).
* The user should observe the USBHS_SR.SPEED field to know
* the speed running at the end of the reset
* (USBHS_DEVISR.EORST = 1).
*/
else if ((pending & USBHS_DEVINT_EORST) != 0)
{
/* Sample the USBHS SR register at the time of the EORST event. */
regval = sam_getreg(SAM_USBHS_SR);
usbtrace(TRACE_INTDECODE(SAM_TRACEINTID_ENDRESET), regval);
/* Acknowledge the interrupt, clear pending wakeup and suspend
* status as we..
*/
sam_putreg(USBHS_DEVINT_WAKEUP | USBHS_DEVINT_SUSPD |
USBHS_DEVINT_EORST,
SAM_USBHS_DEVICR);
/* Enable suspend interrupts */
sam_putreg(USBHS_DEVINT_SUSPD, SAM_USBHS_DEVIER);
/* Handle the reset (will select full speed mode) */
sam_reset(priv);
/* Get the correct speed mode reported by the hardware */
switch (regval & USBHS_SR_SPEED_MASK)
{
default:
case USBHS_SR_SPEED_FULL:
priv->usbdev.speed = USB_SPEED_FULL;
break;
case USBHS_SR_SPEED_HIGH:
priv->usbdev.speed = USB_SPEED_HIGH;
break;
case USBHS_SR_SPEED_LOW:
priv->usbdev.speed = USB_SPEED_LOW;
break;
}
usbtrace(TRACE_INTDECODE(SAM_TRACEINTID_SPEED),
priv->usbdev.speed);
}
/* Upstream resume */
else if ((pending & USBHS_DEVINT_UPRSM) != 0)
{
/* Acknowledge interrupt */
usbtrace(TRACE_INTDECODE(SAM_TRACEINTID_UPSTRRES),
(uint16_t)pending);
sam_putreg(USBHS_DEVINT_UPRSM, SAM_USBHS_DEVICR);
}
#ifdef CONFIG_USBDEV_DMA
/* Endpoint DMA interrupts */
else if ((pending & USBHS_DEVINT_DMA_MASK) != 0)
{
/* Each endpoint DMA ineterrupt is cleared when the
* USBHS_DEVDMASTATUSx interrupt source is cleared.
*/
/* Process each pending endpoint DMA interrupt */
for (i = 1; i <= SAM_USBHS_NDMACHANNELS; i++)
{
/* Is there a DMA interrupt pending for endpoint i? */
if ((pending & USBHS_DEVINT_DMA(i)) != 0)
{
/* Yes.. process the endpoint i DMA interrupt */
usbtrace(TRACE_INTDECODE(SAM_TRACEINTID_DMA), (uint16_t)i);
sam_dma_interrupt(priv, i);
}
}
}
#endif
/* Endpoint Interrupts */
else if ((pending & USBHS_DEVINT_PEP_MASK) != 0)
{
/* Each endpoint interrupt is cleared when the interrupt source
* is serviced.
*/
/* Process each pending endpoint interrupt */
for (i = 0; i < SAM_USBHS_NENDPOINTS; i++)
{
/* Is there an interrupt pending for endpoint i? */
if ((pending & USBHS_DEVINT_PEP(i)) != 0)
{
/* Yes.. process the endpoint i interrupt */
usbtrace(TRACE_INTDECODE(SAM_TRACEINTID_EP), (uint16_t)i);
sam_ep_interrupt(priv, i);
}
}
}
/* Re-sample the set of pending interrupts */
devisr = sam_getreg(SAM_USBHS_DEVISR);
regval = sam_getreg(SAM_USBHS_DEVIMR);
pending = devisr & regval;
}
usbtrace(TRACE_INTEXIT(SAM_TRACEINTID_INTERRUPT), devisr);
UP_MB();
return OK;
}
/****************************************************************************
*
* Suspend/Resume Helpers
*
****************************************************************************/
/****************************************************************************
*
* Name: sam_suspend
*
****************************************************************************/
static void sam_suspend(struct sam_usbdev_s *priv)
{
/* Don't do anything if the device is already suspended */
if (priv->devstate != USBHS_DEVSTATE_SUSPENDED)
{
/* Notify the class driver of the suspend event */
if (priv->driver)
{
CLASS_SUSPEND(priv->driver, &priv->usbdev);
}
/* Switch to the Suspended state */
priv->prevstate = priv->devstate;
priv->devstate = USBHS_DEVSTATE_SUSPENDED;
/* Let the board-specific logic know that we have entered the
* suspend state. This may trigger additional reduced power
* consumption measures.
*/
sam_usbsuspend((struct usbdev_s *)priv, false);
}
}
/****************************************************************************
*
* Name: sam_resume
*
****************************************************************************/
static void sam_resume(struct sam_usbdev_s *priv)
{
uint32_t regval;
/* This function is called when either
* (1) a WKUP interrupt is received from
* the host PC, or
* (2) the class device implementation calls the wakeup()
* method.
*/
/* Don't do anything if the device was not suspended */
if (priv->devstate == USBHS_DEVSTATE_SUSPENDED)
{
/* Un-freeze clocking */
regval = sam_getreg(SAM_USBHS_CTRL);
regval &= ~USBHS_CTRL_FRZCLK;
sam_putreg(regval, SAM_USBHS_CTRL);
/* Revert to the previous state */
priv->devstate = priv->prevstate;
/* Restore full power --
* whatever that means forSC this particular board
*/
/* Restore full power --
* whatever that means for this particular board
*/
sam_usbsuspend((struct usbdev_s *)priv, true);
/* Notify the class driver of the resume event */
if (priv->driver)
{
CLASS_RESUME(priv->driver, &priv->usbdev);
}
}
}
/****************************************************************************
*
* Endpoint Helpers
*
****************************************************************************/
/****************************************************************************
*
* Name: sam_ep_reset
*
* Description:
* Reset and disable a set of endpoints.
*
****************************************************************************/
static void sam_ep_reset(struct sam_usbdev_s *priv, uint8_t epno)
{
struct sam_ep_s *privep = &priv->eplist[epno];
uint32_t regval;
/* Disable endpoint interrupt */
sam_putreg(USBHS_DEVINT_PEP(epno), SAM_USBHS_DEVIDR);
/* Clear all pending interrupts */
sam_putreg(USBHS_DEVEPTICR_ALLINTS, SAM_USBHS_DEVEPTICR(epno));
/* Set DMA control register to a defined state */
if ((SAM_EPSET_DMA & SAM_EP_BIT(epno)) != 0)
{
sam_putreg(0, SAM_USBHS_DEVDMACTRL(epno));
}
/* Cancel any queued requests. Since they are cancelled with status
* -ESHUTDOWN, then will not be requeued until the configuration is reset.
* NOTE: This should not be necessary... the CLASS_DISCONNECT above
* should result in the class implementation calling sam_ep_disable
* for each of its configured endpoints.
*/
sam_req_cancel(privep, -ESHUTDOWN);
/* Put the endpoint in reset */
regval = sam_getreg(SAM_USBHS_DEVEPT);
regval |= USBHS_DEVEPT_EPRST(epno);
sam_putreg(regval, SAM_USBHS_DEVEPT);
/* Reset endpoint status */
privep->epstate = USBHS_EPSTATE_DISABLED;
privep->stalled = false;
privep->halted = false;
privep->zlpneeded = false;
privep->zlpsent = false;
privep->bank = 0;
/* Take the endpoint out of reset */
regval &= ~USBHS_DEVEPT_EPRST(epno);
sam_putreg(regval, SAM_USBHS_DEVEPT);
}
/****************************************************************************
*
* Name: sam_epset_reset
*
* Description:
* Reset and disable a set of endpoints.
*
****************************************************************************/
static void sam_epset_reset(struct sam_usbdev_s *priv, uint16_t epset)
{
uint32_t bit;
int epno;
/* Reset each endpoint in the set */
for (epno = 0, bit = 1, epset &= SAM_EPSET_ALL;
epno < SAM_USBHS_NENDPOINTS && epset != 0;
epno++, bit <<= 1)
{
/* Is this endpoint in the set? */
if ((epset & bit) != 0)
{
/* Yes.. reset it */
sam_ep_reset(priv, epno);
epset &= ~bit;
}
}
}
/****************************************************************************
*
* Name: sam_ep_reserve
*
* Description:
* Find an un-reserved endpoint number and reserve it for the caller.
*
****************************************************************************/
static inline struct sam_ep_s *
sam_ep_reserve(struct sam_usbdev_s *priv, uint16_t epset)
{
struct sam_ep_s *privep = NULL;
irqstate_t flags;
int epndx = 0;
flags = enter_critical_section();
epset &= priv->epavail;
if (epset)
{
/* Select the lowest bit in the set of matching, available endpoints
* (skipping EP0)
*/
for (epndx = 1; epndx < SAM_USBHS_NENDPOINTS; epndx++)
{
uint16_t bit = SAM_EP_BIT(epndx);
if ((epset & bit) != 0)
{
/* Mark the endpoint no longer available */
priv->epavail &= ~bit;
/* And return the pointer to the standard endpoint structure */
privep = &priv->eplist[epndx];
break;
}
}
}
leave_critical_section(flags);
return privep;
}
/****************************************************************************
*
* Name: sam_ep_unreserve
*
* Description:
* The endpoint is no long in-used. It will be un-reserved and can be
* reused if needed.
*
****************************************************************************/
static inline void
sam_ep_unreserve(struct sam_usbdev_s *priv, struct sam_ep_s *privep)
{
irqstate_t flags = enter_critical_section();
priv->epavail |= SAM_EP_BIT(USB_EPNO(privep->ep.eplog));
leave_critical_section(flags);
}
/****************************************************************************
*
* Name: sam_ep_configure_internal
*
* Description:
* This is the internal implementation of the endpoint configuration logic
* and implements the endpoint configuration method of the usbdev_ep_s
* interface. As an internal interface, it will be used to configure
* endpoint 0 which is not available to the class implementation.
*
****************************************************************************/
static int sam_ep_configure_internal(struct sam_ep_s *privep,
const struct usb_epdesc_s *desc)
{
struct sam_usbdev_s *priv;
uintptr_t regaddr;
uint32_t regval;
uint16_t maxpacket;
uint8_t epno;
uint8_t eptype;
uint8_t nbtrans;
bool dirin;
uinfo("len: %02x type: %02x addr: %02x attr: %02x "
"maxpacketsize: %02x %02x interval: %02x\n",
desc->len, desc->type, desc->addr, desc->attr,
desc->mxpacketsize[0], desc->mxpacketsize[1],
desc->interval);
/* Decode the endpoint descriptor */
epno = USB_EPNO(desc->addr);
dirin = (desc->addr & USB_DIR_MASK) == USB_REQ_DIR_IN;
eptype = (desc->attr & USB_EP_ATTR_XFERTYPE_MASK) >>
USB_EP_ATTR_XFERTYPE_SHIFT;
maxpacket = GETUINT16(desc->mxpacketsize);
nbtrans = 1;
/* Initialize the endpoint structure */
priv = privep->dev;
privep->ep.eplog = desc->addr; /* Includes direction */
privep->epstate = USBHS_EPSTATE_IDLE;
privep->bank = SAM_USBHS_NBANKS(epno);
/* Special case maxpacket handling for high-speed endpoints */
if (priv->usbdev.speed == USB_SPEED_HIGH)
{
/* HS Interval, 125us */
/* MPS: Bits 12:11 specify NB_TRANS, as USB 2.0 Spec. */
nbtrans = ((maxpacket >> 11) & 3);
if (nbtrans == 3)
{
nbtrans = 1;
}
else
{
nbtrans++;
}
/* nbtrans = 0: Reserved to endpoint that does not have the high-
* bandwidth isochronous capability.
* nbtrans = 1: Default value: one transaction per microframe.
* nbtrans = 2: Two transactions per microframe. This endpoint
* should be configured as double-bank.
* nbtrans = 3 Three transactions per microframe. This endpoint
* should be configured as triple-bank
*/
if (privep->bank < nbtrans)
{
nbtrans = privep->bank;
}
/* Mask, bit 10..0 is the max packet size */
maxpacket &= 0x7ff;
}
privep->ep.maxpacket = maxpacket;
/* Initialize the endpoint hardware */
/* Disable the endpoint */
regval = sam_getreg(SAM_USBHS_DEVEPT);
regval &= ~USBHS_DEVEPT_EPEN(epno);
sam_putreg(regval, SAM_USBHS_DEVEPT);
sam_putreg(USBHS_DEVEPTIDR_ALLINTS, SAM_USBHS_DEVEPTIDR(epno));
/* Clear toggle and stall indications */
sam_putreg(USBHS_DEVEPTISR_DTSEQ_MASK | USBHS_DEVEPTINT_STALLEDI,
SAM_USBHS_DEVEPTICR(epno));
/* Reset the endpoint */
regval = sam_getreg(SAM_USBHS_DEVEPT);
regval |= USBHS_DEVEPT_EPRST(epno);
sam_putreg(regval, SAM_USBHS_DEVEPT);
regval &= ~USBHS_DEVEPT_EPRST(epno);
sam_putreg(regval, SAM_USBHS_DEVEPT);
/* If this is EP0, disable interrupts now */
if (eptype == USB_EP_ATTR_XFER_CONTROL)
{
sam_putreg(USBHS_DEVINT_PEP(epno), SAM_USBHS_DEVIDR);
}
/* Enable the endpoint */
regval = sam_getreg(SAM_USBHS_DEVEPT);
regval |= USBHS_DEVEPT_EPEN(epno);
sam_putreg(regval, SAM_USBHS_DEVEPT);
/* Configure the endpoint */
regval = USBHS_DEVEPTCFG_ALLOC |
USBHS_DEVEPTCFG_EPDIR(dirin) |
USBHS_DEVEPTCFG_EPTYPE(eptype) |
USBHS_DEVEPTCFG_EPBK(privep->bank) |
USBHS_DEVEPTCFG_NBTRANS(nbtrans);
if (maxpacket <= 8)
{
regval |= USBHS_DEVEPTCFG_EPSIZE_8;
}
else if (maxpacket <= 16)
{
regval |= USBHS_DEVEPTCFG_EPSIZE_16;
}
else if (maxpacket <= 32)
{
regval |= USBHS_DEVEPTCFG_EPSIZE_32;
}
else if (maxpacket <= 64)
{
regval |= USBHS_DEVEPTCFG_EPSIZE_64;
}
else if (maxpacket <= 128)
{
regval |= USBHS_DEVEPTCFG_EPSIZE_128;
}
else if (maxpacket <= 256)
{
regval |= USBHS_DEVEPTCFG_EPSIZE_256;
}
else if (maxpacket <= 512)
{
regval |= USBHS_DEVEPTCFG_EPSIZE_512;
}
else if (maxpacket <= 1024)
{
regval |= USBHS_DEVEPTCFG_EPSIZE_1024;
}
else
{
usbtrace(TRACE_DEVERROR(SAM_TRACEERR_BADEPTYPE), eptype);
DEBUGPANIC();
regval |= USBHS_DEVEPTCFG_EPSIZE_8;
}
regaddr = SAM_USBHS_DEVEPTCFG(epno);
sam_putreg(regval, regaddr);
/* Verify that the CFGOK flag is set. This flag is set if the
* endpoint size and the number of banks are correct compared to
* the FIFO maximum capacity and the maximum number of allowed banks.
*/
regaddr = SAM_USBHS_DEVEPTISR(epno);
if ((sam_getreg(regaddr) & USBHS_DEVEPTISR_CFGOK) == 0)
{
usbtrace(TRACE_DEVERROR(SAM_TRACEERR_NCFGOK), epno);
return -EINVAL;
}
/* Enable the endpoint. The way that the endpoint is enabled depends of
* if the endpoint supports DMA transfers or not.
*/
if ((SAM_EPSET_DMA & SAM_EP_BIT(epno)) != 0)
{
/* Select AUTO_VALID so that the hardware will manage FIFCON. */
regaddr = SAM_USBHS_DEVEPTCFG(epno);
regval |= USBHS_DEVEPTCFG_AUTOSW;
sam_putreg(regval, SAM_USBHS_DEVEPTCFG(epno));
}
else
{
/* No DMA... Software will manage FIFOCON. */
regval = USBHS_DEVEPTINT_KILLBKI | USBHS_DEVEPTINT_RXSTPI;
sam_putreg(regval, SAM_USBHS_DEVEPTIER(epno));
}
/* If this is EP0, enable interrupts now */
if (eptype == USB_EP_ATTR_XFER_CONTROL)
{
/* Enable the endpoint 0 RX interrupts */
regaddr = SAM_USBHS_DEVEPTIER(epno);
regval = USBHS_DEVEPTINT_RXOUTI | USBHS_DEVEPTINT_RXSTPI;
sam_putreg(regval, regaddr);
/* Enable endpoint 0 general interrupts */
sam_putreg(USBHS_DEVINT_PEP(epno), SAM_USBHS_DEVIER);
}
#ifdef CONFIG_USBDEV_DMA
else
{
/* Enable automatic bank switching */
regaddr = SAM_USBHS_DEVEPTIER(epno);
regval = sam_getreg(regaddr);
regval |= USBHS_DEVEPTCFG_AUTOSW;
sam_putreg(regval, regaddr);
}
#endif
sam_dumpep(priv, epno);
return OK;
}
/****************************************************************************
*
* Name: sam_ep0_configure
*
* Description:
* Configure EP0 for normal operation.
*
****************************************************************************/
static inline int sam_ep0_configure(struct sam_usbdev_s *priv)
{
return sam_ep_configure_internal(&priv->eplist[EP0], &g_ep0desc);
}
/****************************************************************************
*
* Endpoint operations
*
****************************************************************************/
/****************************************************************************
*
* Name: sam_ep_configure
*
* Description:
* This is the endpoint configuration method of the usbdev_ep_s interface.
*
****************************************************************************/
static int sam_ep_configure(struct usbdev_ep_s *ep,
const struct usb_epdesc_s *desc,
bool last)
{
struct sam_ep_s *privep = (struct sam_ep_s *)ep;
struct sam_usbdev_s *priv;
int ret;
/* Verify parameters. Endpoint 0 is not available at this interface */
#if defined(CONFIG_DEBUG_FEATURES) || defined(CONFIG_USBDEV_TRACE)
uint8_t epno = USB_EPNO(desc->addr);
usbtrace(TRACE_EPCONFIGURE, (uint16_t)epno);
DEBUGASSERT(ep && desc && epno > 0 && epno < SAM_USBHS_NENDPOINTS);
DEBUGASSERT(epno == USB_EPNO(ep->eplog));
#endif
/* This logic is implemented in sam_ep_configure_internal */
ret = sam_ep_configure_internal(privep, desc);
if (ret == OK && last)
{
/* If this was the last endpoint, then the class driver is fully
* configured.
*/
priv = privep->dev;
priv->devstate = USBHS_DEVSTATE_CONFIGURED;
}
return ret;
}
/****************************************************************************
*
* Name: sam_ep_disable
*
* Description:
* This is the disable() method of the USB device endpoint structure.
*
****************************************************************************/
static int sam_ep_disable(struct usbdev_ep_s *ep)
{
struct sam_ep_s *privep = (struct sam_ep_s *)ep;
struct sam_usbdev_s *priv;
irqstate_t flags;
uint8_t epno;
DEBUGASSERT(ep != NULL);
epno = USB_EPNO(ep->eplog);
usbtrace(TRACE_EPDISABLE, epno);
/* Reset the endpoint and cancel any ongoing activity */
flags = enter_critical_section();
priv = privep->dev;
sam_ep_reset(priv, epno);
/* Revert to the addressed-but-not-configured state */
priv->devstate = USBHS_DEVSTATE_ADDRESSED;
leave_critical_section(flags);
return OK;
}
/****************************************************************************
*
* Name: sam_ep_allocreq
*
* Description:
* This is the allocreq() method of the USB device endpoint structure.
*
****************************************************************************/
static struct usbdev_req_s *sam_ep_allocreq(struct usbdev_ep_s *ep)
{
struct sam_req_s *privreq;
DEBUGASSERT(ep != NULL);
usbtrace(TRACE_EPALLOCREQ, USB_EPNO(ep->eplog));
privreq = kmm_malloc(sizeof(struct sam_req_s));
if (!privreq)
{
usbtrace(TRACE_DEVERROR(SAM_TRACEERR_ALLOCFAIL), 0);
return NULL;
}
memset(privreq, 0, sizeof(struct sam_req_s));
return &privreq->req;
}
/****************************************************************************
*
* Name: sam_ep_freereq
*
* Description:
* This is the freereq() method of the USB device endpoint structure.
*
****************************************************************************/
static void sam_ep_freereq(struct usbdev_ep_s *ep, struct usbdev_req_s *req)
{
struct sam_req_s *privreq = (struct sam_req_s *)req;
DEBUGASSERT(ep != NULL && req != NULL);
usbtrace(TRACE_EPFREEREQ, USB_EPNO(ep->eplog));
kmm_free(privreq);
}
/****************************************************************************
*
* Name: sam_ep_allocbuffer
*
* Description:
* This is the allocbuffer() method of the USB device endpoint structure.
*
****************************************************************************/
#ifdef CONFIG_USBDEV_DMA
static void *sam_ep_allocbuffer(struct usbdev_ep_s *ep, uint16_t nbytes)
{
/* Allocate properly aligned memory */
return kmm_memalign(USBHS_ALIGN, USBHS_ALIGN_UP(nbytes));
}
#endif
/****************************************************************************
*
* Name: sam_ep_freebuffer
*
* Description:
* This is the freebuffer() method of the USB device endpoint structure.
*
****************************************************************************/
#ifdef CONFIG_USBDEV_DMA
static void sam_ep_freebuffer(struct usbdev_ep_s *ep, void *buf)
{
/* There is no special buffer requirement to free aligned DMA buffers */
kumm_free(buf);
}
#endif
/****************************************************************************
*
* Name: sam_ep_submit
*
* Description:
* This is the submit() method of the USB device endpoint structure.
*
****************************************************************************/
static int sam_ep_submit(struct usbdev_ep_s *ep, struct usbdev_req_s *req)
{
struct sam_req_s *privreq = (struct sam_req_s *)req;
struct sam_ep_s *privep = (struct sam_ep_s *)ep;
struct sam_usbdev_s *priv;
irqstate_t flags;
uint8_t epno;
int ret = OK;
DEBUGASSERT(ep != NULL && req != NULL && req->callback !=
NULL && req->buf != NULL);
usbtrace(TRACE_EPSUBMIT, USB_EPNO(ep->eplog));
priv = privep->dev;
DEBUGASSERT(priv->driver != NULL);
/* Handle the request from the class driver */
epno = USB_EPNO(ep->eplog);
req->result = -EINPROGRESS;
req->xfrd = 0;
privreq->inflight = 0;
flags = enter_critical_section();
/* Handle IN (device-to-host) requests. NOTE: If the class device is
* using the bi-directional EP0, then we assume that they intend the EP0
* IN functionality (EP0 SETUP OUT data receipt does not use requests).
*/
if (USB_ISEPIN(ep->eplog) || epno == EP0)
{
/* If the endpoint is stalled, then fail any attempts to write
* through the endpoint.
*/
if (privep->stalled)
{
sam_req_abort(privep, privreq, -EBUSY);
uerr("ERROR: stalled\n");
ret = -EPERM;
}
else
{
/* Add the new request to the request queue for the IN endpoint */
sam_req_enqueue(&privep->reqq, privreq);
usbtrace(TRACE_INREQQUEUED(epno), req->len);
/* If the IN endpoint is IDLE, then transfer the data now */
if (privep->epstate == USBHS_EPSTATE_IDLE)
{
ret = sam_req_write(priv, privep);
}
}
}
/* Handle OUT (host-to-device) requests */
else
{
/* Add the new request to the request queue for the OUT endpoint */
sam_req_enqueue(&privep->reqq, privreq);
usbtrace(TRACE_OUTREQQUEUED(epno), req->len);
/* If the OUT endpoint IDLE, then setup the read */
if (privep->epstate == USBHS_EPSTATE_IDLE)
{
ret = sam_req_read(priv, privep, 0);
}
}
leave_critical_section(flags);
return ret;
}
/****************************************************************************
*
* Name: sam_ep_cancel
*
****************************************************************************/
static int sam_ep_cancel(struct usbdev_ep_s *ep, struct usbdev_req_s *req)
{
struct sam_ep_s *privep = (struct sam_ep_s *)ep;
irqstate_t flags;
DEBUGASSERT(ep != NULL && req != NULL);
usbtrace(TRACE_EPCANCEL, USB_EPNO(ep->eplog));
flags = enter_critical_section();
sam_req_cancel(privep, -EAGAIN);
leave_critical_section(flags);
return OK;
}
/****************************************************************************
*
* Name: sam_ep_stall
*
****************************************************************************/
static int sam_ep_stall(struct usbdev_ep_s *ep, bool resume)
{
struct sam_ep_s *privep;
struct sam_usbdev_s *priv;
uint8_t epno = USB_EPNO(ep->eplog);
uintptr_t regaddr;
uint32_t regval;
irqstate_t flags;
DEBUGASSERT(ep != NULL);
/* Check that endpoint is in Idle state */
privep = (struct sam_ep_s *)ep;
DEBUGASSERT(/* privep->epstate == USBHS_EPSTATE_IDLE && */ privep->dev);
priv = (struct sam_usbdev_s *)privep->dev;
epno = USB_EPNO(ep->eplog);
/* STALL or RESUME the endpoint */
flags = enter_critical_section();
usbtrace(resume ? TRACE_EPRESUME : TRACE_EPSTALL, USB_EPNO(ep->eplog));
/* Handle the resume condition */
if (resume)
{
/* Check if the endpoint is halted */
if (privep->epstate == USBHS_EPSTATE_STALLED)
{
usbtrace(TRACE_EPRESUME, epno);
privep->stalled = false;
/* Return endpoint to Idle state */
privep->epstate = USBHS_EPSTATE_IDLE;
/* Clear FORCESTALL request
* REVISIT: Data sheet says to reset toggle to DATA0 only on OUT
* endpoints.
*/
/* Clear FORCESTALL flag */
sam_putreg(USBHS_DEVEPTINT_STALLEDI, SAM_USBHS_DEVEPTIDR(epno));
regaddr = SAM_USBHS_DEVEPTCFG(epno);
regval = sam_getreg(regaddr);
regval |= USBHS_DEVEPTCFG_AUTOSW;
sam_putreg(regval, regaddr);
/* Reset the endpoint */
regval = sam_getreg(SAM_USBHS_DEVEPT);
regval |= USBHS_DEVEPT_EPRST(epno);
sam_putreg(regval, SAM_USBHS_DEVEPT);
regval &= ~USBHS_DEVEPT_EPRST(epno);
sam_putreg(regval, SAM_USBHS_DEVEPT);
/* Resuming any blocked data transfers on the endpoint */
if (epno == 0 || USB_ISEPIN(ep->eplog))
{
/* IN endpoint (or EP0). Restart any queued write requests */
sam_req_write(priv, privep);
}
else
{
/* OUT endpoint. Restart any queued read requests. */
sam_req_read(priv, privep, 0);
}
}
}
/* Handle the stall condition */
else
{
/* Check that endpoint is enabled and not already in Halt state */
if ((privep->epstate != USBHS_EPSTATE_DISABLED) &&
(privep->epstate != USBHS_EPSTATE_STALLED))
{
usbtrace(TRACE_EPSTALL, epno);
/* If this is an IN endpoint (or endpoint 0), then cancel all
* of the pending write requests.
*/
if (epno == 0 || USB_ISEPIN(ep->eplog))
{
sam_req_cancel(privep, -EPERM);
}
/* Otherwise, it is an OUT endpoint. Complete any read request
* currently in progress (it will get requeued immediately).
*/
else if (privep->epstate == USBHS_EPSTATE_RECEIVING)
{
sam_req_complete(privep, -EPERM);
}
/* Put endpoint into stalled state */
privep->epstate = USBHS_EPSTATE_STALLED;
privep->stalled = true;
regaddr = SAM_USBHS_DEVEPTCFG(epno);
regval = sam_getreg(regaddr);
regval &= ~USBHS_DEVEPTCFG_AUTOSW;
sam_putreg(regval, regaddr);
sam_putreg(USBHS_DEVEPTINT_STALLRQI, SAM_USBHS_DEVEPTIER(epno));
/* Disable endpoint/DMA interrupts. They not be re-enabled until
* the stall is cleared and the next transfer is started. It
* would, of course, be a bad idea to do this on EP0 since it is
* a SETUP request that is going to clear the STALL.
*/
if (epno != 0)
{
regval = sam_getreg(SAM_USBHS_DEVIDR);
regval |= USBHS_DEVINT_PEP(epno);
#ifdef CONFIG_USBDEV_DMA
if (SAM_USBHS_DMA(epno))
{
/* Disable the endpoint DMA interrupt */
regval |= USBHS_DEVINT_DMA(epno);
}
#endif
sam_putreg(regval, SAM_USBHS_DEVIDR);
}
}
}
leave_critical_section(flags);
return OK;
}
/****************************************************************************
*
* Device Controller Operations
*
****************************************************************************/
/****************************************************************************
*
* Name: sam_allocep
*
* Description:
* This is the allocep() method of the USB device driver interface
*
****************************************************************************/
static struct usbdev_ep_s *sam_allocep(struct usbdev_s *dev, uint8_t epno,
bool in, uint8_t eptype)
{
struct sam_usbdev_s *priv = (struct sam_usbdev_s *)dev;
struct sam_ep_s *privep = NULL;
uint16_t epset = SAM_EPSET_NOTEP0;
usbtrace(TRACE_DEVALLOCEP, (uint16_t)epno);
DEBUGASSERT(dev != NULL);
/* Ignore any direction bits in the logical address */
epno = USB_EPNO(epno);
/* A logical address of 0 means that any endpoint will do */
if (epno > 0)
{
/* Otherwise, we will return the endpoint
* structure only for the requested 'logical' endpoint.
* All of the other checks will still be performed.
*
* First, verify that the logical endpoint is in the
* range supported by the hardware.
*/
if (epno >= SAM_USBHS_NENDPOINTS)
{
usbtrace(TRACE_DEVERROR(SAM_TRACEERR_BADEPNO), (uint16_t)epno);
return NULL;
}
/* Convert the logical address to a physical OUT endpoint address and
* remove all of the candidate endpoints from the bitset except for the
* the IN/OUT pair for this logical address.
*/
epset = SAM_EP_BIT(epno);
}
/* Check if the selected endpoint number is available */
privep = sam_ep_reserve(priv, epset);
if (!privep)
{
usbtrace(TRACE_DEVERROR(SAM_TRACEERR_EPRESERVE), (uint16_t)epset);
return NULL;
}
return &privep->ep;
}
/****************************************************************************
*
* Name: sam_freeep
*
* Description:
* This is the freeep() method of the USB device driver interface
*
****************************************************************************/
static void sam_freeep(struct usbdev_s *dev, struct usbdev_ep_s *ep)
{
struct sam_usbdev_s *priv;
struct sam_ep_s *privep;
DEBUGASSERT(dev != NULL && ep != NULL);
priv = (struct sam_usbdev_s *)dev;
privep = (struct sam_ep_s *)ep;
usbtrace(TRACE_DEVFREEEP, (uint16_t)USB_EPNO(ep->eplog));
if (priv && privep)
{
/* Mark the endpoint as available */
sam_ep_unreserve(priv, privep);
}
}
/****************************************************************************
*
* Name: sam_getframe
*
* Description:
* This is the getframe() method of the USB device driver interface
*
****************************************************************************/
static int sam_getframe(struct usbdev_s *dev)
{
uint32_t regval;
uint16_t frameno;
DEBUGASSERT(dev != NULL);
/* Return the last frame number detected by the hardware */
regval = sam_getreg(SAM_USBHS_DEVFNUM);
frameno = (regval & USBHS_DEVFNUM_FNUM_MASK) >> USBHS_DEVFNUM_FNUM_SHIFT;
usbtrace(TRACE_DEVGETFRAME, frameno);
return frameno;
}
/****************************************************************************
*
* Name: sam_wakeup
*
* Description:
* This is the wakeup() method of the USB device driver interface
*
****************************************************************************/
static int sam_wakeup(struct usbdev_s *dev)
{
struct sam_usbdev_s *priv = (struct sam_usbdev_s *)dev;
irqstate_t flags;
uint32_t regval;
usbtrace(TRACE_DEVWAKEUP, 0);
DEBUGASSERT(dev != NULL);
/* Resume normal operation */
flags = enter_critical_section();
sam_resume(priv);
/* Activate a remote wakeup.
* Setting this bit forces an external interrupt
* on the USBHS controller for Remote Wake UP purposes.
* An Upstream Resume is sent only after the
* USBHS bus has been in SUSPEND state for at least 5 ms.
*/
regval = sam_getreg(SAM_USBHS_DEVCTRL);
regval |= USBHS_DEVCTRL_RMWKUP;
sam_putreg(regval, SAM_USBHS_DEVCTRL);
leave_critical_section(flags);
/* This bit is automatically cleared by hardware at the end of the Upstream
* Resume
*/
while ((sam_getreg(SAM_USBHS_DEVCTRL) & USBHS_DEVCTRL_RMWKUP) != 0);
return OK;
}
/****************************************************************************
*
* Name: sam_selfpowered
*
* Description:
* This is the selfpowered() method of the USB device driver interface
*
****************************************************************************/
static int sam_selfpowered(struct usbdev_s *dev, bool selfpowered)
{
struct sam_usbdev_s *priv = (struct sam_usbdev_s *)dev;
usbtrace(TRACE_DEVSELFPOWERED, (uint16_t)selfpowered);
DEBUGASSERT(dev != NULL);
priv->selfpowered = selfpowered;
return OK;
}
/****************************************************************************
*
* Name: sam_pullup
*
* Description:
* This is the pullup() method of the USB device driver interface
*
****************************************************************************/
static int sam_pullup(struct usbdev_s *dev, bool enable)
{
struct sam_usbdev_s *priv = (struct sam_usbdev_s *)dev;
irqstate_t flags;
uint32_t regval;
usbtrace(TRACE_DEVPULLUP, (uint16_t)enable);
flags = enter_critical_section();
if (enable)
{
/* Un-freeze clocking.
*
* When the clock is frozen, on certain bits in the USBCH_CTRL
* register can be modified (FRZCLK, USBE, and LS). In addition,
* only the asynchronous interrupt sources can trigger the USB
* interrupt:
*
* - Wake-up Interrupt (USBHS_DEVISR.WAKEUP)
* - Host Wake-up Interrupt (USBHS_HSTISR.HWUPI)
*/
regval = sam_getreg(SAM_USBHS_CTRL);
regval &= ~USBHS_CTRL_FRZCLK;
sam_putreg(regval, SAM_USBHS_CTRL);
/* DETACH=0: USBHS is attached. ARMs the USBHS to pull up the DP line
* when the USBHS is no longer suspended.
*/
regval = sam_getreg(SAM_USBHS_DEVCTRL);
regval &= ~USBHS_DEVCTRL_DETACH;
sam_putreg(regval, SAM_USBHS_DEVCTRL);
priv->usbdev.speed = USB_SPEED_FULL;
/* There are several possibilities:
*
* 1. The device may not be plugged into a host.
* In that case, the hardware will be in a suspended state.
* When an idle USB bus state has been detected for 3 ms,
* the controller sets the Suspend
* (USBHS_DEVISR.SUSP) interrupt bit.
* 2. We may have been suspended but a WAKEUP
* event has already occurred.
* The USBHS_DEVISR.WAKEUP interrupt bit is
* set when a non-idle event is detected,
* it can occur whether the controller is in the Suspend
* mode or not.
* The USBHS_DEVISR.SUSP and USBHS_DEVISR.WAKEUP interrupts
* are thus independent, except that one bit is cleared
* when the other is set.
* 3. Because we have already enabled the pull-up,
* that event may have already have been reset by the host.
*/
regval = sam_getreg(SAM_USBHS_DEVISR);
if ((regval & USBHS_DEVINT_SUSPD) == 0)
{
/* If the USBHS detects activity on the BUS, then it will not be
* suspended. In that case, next event that we expect to see is a
* reset from the connected host. When a USB reset is detected on
* the USB line, the following operations are performed by the
* controller:
*
* - All endpoints are disabled, except the default control
* endpoint.
* - The default control endpoint is reset
* - The data toggle sequence of the default control endpoint is
* cleared.
* - At the end of the reset process, the End of Reset
* (USBHS_DEVISR.EORST) bit is set.
* - During a reset, the USBHS automatically switches to High-
* speed mode if the host is High-speed-capable (the reset is
* called High-speed reset). The user should observe the
* USBHS_SR.SPEED field to know the speed running at the end
* of the reset (USBHS_DEVISR.EORST = 1).
*
* The class implementation should not call this method with
* enable == true until is is fully initialized and ready to
* accept connections.
*/
/* Enable expected interrupts */
sam_putreg(USBHS_DEVINT_EORST | USBHS_DEVINT_EORSM |
USBHS_DEVINT_SUSPD,
SAM_USBHS_DEVIER);
/* Leave the clock unfrozen */
}
else
{
/* If there is no host connected (no bus activity), then we
* might get a SUSPend interrupt instead of a End of Reset. In
* the case, we would like to keep the clock frozen until the
* host is connected.
*
* The strategy here was taken from the SAMV7 sample code: It
* will force a SUSPend event. Then disable clocking. We will
* take the SUSPend interrupt (because it is already pending),
* but after the clock is frozen, only a WAKEUP interrupt can be
* received.
*/
/* Enable wakeup interrupts */
sam_putreg(USBHS_DEVINT_WAKEUP | USBHS_DEVINT_EORSM,
SAM_USBHS_DEVIER);
/* Enable expected interrupts */
sam_putreg(USBHS_DEVINT_EORST | USBHS_DEVINT_WAKEUP |
USBHS_DEVINT_SUSPD,
SAM_USBHS_DEVIER);
/* Clear pending interrupts */
sam_putreg(USBHS_DEVINT_EORST | USBHS_DEVINT_SUSPD,
SAM_USBHS_DEVICR);
/* Force the first suspend event */
sam_putreg(USBHS_DEVINT_SUSPD, SAM_USBHS_DEVIFR);
sam_putreg(USBHS_DEVINT_WAKEUP, SAM_USBHS_DEVICR);
/* Refreeze the clock and wait for the wakeup event */
regval = sam_getreg(SAM_USBHS_CTRL);
regval |= USBHS_CTRL_FRZCLK;
sam_putreg(regval, SAM_USBHS_CTRL);
}
}
else
{
/* DETACH=1: USBHS is detached, UTMI transceiver is suspended. */
regval = sam_getreg(SAM_USBHS_DEVCTRL);
regval |= USBHS_DEVCTRL_DETACH;
sam_putreg(regval, SAM_USBHS_DEVCTRL);
/* Freeze clocking */
regval = sam_getreg(SAM_USBHS_CTRL);
regval |= USBHS_CTRL_FRZCLK;
sam_putreg(regval, SAM_USBHS_CTRL);
/* Device returns to the Powered state */
if (priv->devstate > USBHS_DEVSTATE_POWERED)
{
priv->devstate = USBHS_DEVSTATE_POWERED;
}
if (priv->prevstate > USBHS_DEVSTATE_POWERED)
{
priv->prevstate = USBHS_DEVSTATE_POWERED;
}
}
leave_critical_section(flags);
return OK;
}
/****************************************************************************
*
* Initialization/Reset
*
****************************************************************************/
/****************************************************************************
*
* Name: sam_reset
*
****************************************************************************/
static void sam_reset(struct sam_usbdev_s *priv)
{
uint32_t regval;
uint8_t epno;
/* Unfreeze clocking to the USBHS peripheral. */
regval = sam_getreg(SAM_USBHS_CTRL);
regval &= ~USBHS_CTRL_FRZCLK;
sam_putreg(regval, SAM_USBHS_CTRL);
/* Tell the class driver that we are disconnected. The class driver
* should then accept any new configurations.
*/
CLASS_DISCONNECT(priv->driver, &priv->usbdev);
/* The device enters the Default state */
/* Disable the device address */
regval = sam_getreg(SAM_USBHS_DEVCTRL);
regval &= ~(USBHS_DEVCTRL_UADD_MASK | USBHS_DEVCTRL_ADDEN);
sam_putreg(regval, SAM_USBHS_DEVCTRL);
/* Revert to the un-addressed, default state */
priv->devstate = USBHS_DEVSTATE_DEFAULT;
/* Reset and disable all endpoints. Then re-configure EP0 */
sam_epset_reset(priv, SAM_EPSET_ALL);
sam_ep0_configure(priv);
/* Reset endpoint data structures */
for (epno = 0; epno < SAM_USBHS_NENDPOINTS; epno++)
{
struct sam_ep_s *privep = &priv->eplist[epno];
/* Cancel any queued requests. Since they are cancelled
* with status -ESHUTDOWN, then will not be re-queued
* until the configuration is reset. NOTE: This should
* not be necessary... the CLASS_DISCONNECT above should
* result in the class implementation calling sam_ep_disable
* for each of its configured endpoints.
*/
sam_req_cancel(privep, -ESHUTDOWN);
/* Reset endpoint status */
privep->stalled = false;
privep->halted = false;
privep->zlpneeded = false;
privep->zlpsent = false;
}
/* Re-configure the USB controller in its initial, unconnected state */
priv->usbdev.speed = USB_SPEED_FULL;
/* Enable normal operational interrupts (including endpoint 0) */
regval = USBHS_DEVINT_EORST | USBHS_DEVINT_WAKEUP | USBHS_DEVINT_SUSPD |
USBHS_DEVINT_PEP0;
sam_putreg(regval, SAM_USBHS_DEVIER);
sam_dumpep(priv, EP0);
}
/****************************************************************************
*
* Name: sam_hw_setup
*
****************************************************************************/
static void sam_hw_setup(struct sam_usbdev_s *priv)
{
uint32_t regval;
int i;
/* Disable USB hardware. Will perform a reset of most resisters. */
regval = sam_getreg(SAM_USBHS_CTRL);
regval &= ~USBHS_CTRL_USBE;
sam_putreg(regval, SAM_USBHS_CTRL);
/* Configure USBHS pins. Nothing needs to be done: HDM and HDP are the
* primary pin functions and there are no alternatives.
*/
/* Enable clocking to the USBHS peripheral.
*
* The clock for the USBHS bus interface is generated by the Power
* Management Controller (PMC). Before enabling the USB clock in the
* PMC, the USBHS must be enabled (by writing a one to the
* USBHS_CTRL.USBE bit and a zero to the USBHS_CTRL.FRZCLK bit).
*
* The USBHS can work in two modes:
*
* - Normal mode (SPDCONF = 0) where High speed, Full speed and Low
* speed are available.
* - Low-power mode (SPDCONF = 1) where Full speed and Low speed are
* available.
*
* Only the normal mode is supported by this driver. For Normal mode:
*
* 1. Enable the USBHS peripheral clock (PMC_PCER).
* 2. Enable the USBHS (UIMOD = 1, USBE = 1, FRZCLK = 0).
* 3. Enable the UPLL 480 MHz.
* 4. Wait for the UPLL 480 MHz to be considered as locked by the PMC.
*
* Steps 3 and 4 are performed in sam_usbclock.c.
*/
/* Enable the USBHS peripheral clock (PMC_PCER) */
sam_usbhs_enableclk();
/* Enable USBHS peripheral (USBE = 1) in device mode (UIMOD = 1) and
* unfreeze clocking (FRZCLK = 0)
*/
regval |= USBHS_CTRL_UIMOD_DEVICE;
sam_putreg(regval, SAM_USBHS_CTRL);
regval |= USBHS_CTRL_USBE;
sam_putreg(regval, SAM_USBHS_CTRL);
regval &= ~USBHS_CTRL_UIDE;
sam_putreg(regval, SAM_USBHS_CTRL);
regval &= ~USBHS_CTRL_FRZCLK;
sam_putreg(regval, SAM_USBHS_CTRL);
/* Enable the UPLL */
sam_usbclock();
/* Select High Speed or force Full Speed */
regval = sam_getreg(SAM_USBHS_DEVCTRL);
regval &= ~USBHS_DEVCTRL_SPDCONF_MASK;
#ifdef CONFIG_SAMV7_USBDEVHS_LOWPOWER
regval |= USBHS_DEVCTRL_SPDCONF_LOWPOWER;
#else
regval |= USBHS_DEVCTRL_SPDCONF_NORMAL;
#endif
sam_putreg(regval, SAM_USBHS_DEVCTRL);
/* Wait for UTMI clocking to be usable */
while ((sam_getreg(SAM_USBHS_SR) & USBHS_SR_CLKUSABLE) == 0);
/* Make sure that we are not in Forced Low-Speed mode */
regval = sam_getreg(SAM_USBHS_DEVCTRL);
regval &= ~USBHS_DEVCTRL_LS;
sam_putreg(regval, SAM_USBHS_DEVCTRL);
/* Reset and disable all endpoints, re-initializing endpoint 0. */
sam_epset_reset(priv, SAM_EPSET_ALL);
sam_ep0_configure(priv);
/* Disconnect the device */
regval = sam_getreg(SAM_USBHS_DEVCTRL);
regval |= USBHS_DEVCTRL_DETACH;
sam_putreg(regval, SAM_USBHS_DEVCTRL);
/* Initialize DMA channels */
for (i = 1; i <= SAM_USBHS_NDMACHANNELS; i++)
{
/* Stop any DMA transfer */
sam_putreg(0, SAM_USBHS_DEVDMACTRL(i));
}
/* Disable all endpoint interrupts. Disable all endpoints */
sam_putreg(USBHS_DEVEPT_ALLEPEN, SAM_USBHS_DEVIDR);
sam_putreg(0, SAM_USBHS_DEVEPT);
/* Disable each endpoint interrupt */
for (i = 0; i < SAM_USBHS_NENDPOINTS; i++)
{
/* Disable endpoint interrupts */
sam_putreg(USBHS_DEVEPTIDR_ALLINTS, SAM_USBHS_DEVEPTIDR(i));
/* Clear endpoint status */
sam_putreg(USBHS_DEVEPTICR_ALLINTS, SAM_USBHS_DEVEPTICR(i));
}
/* Disable all interrupts */
sam_putreg(USBHS_DEVINT_ALL, SAM_USBHS_DEVIDR);
/* Initialization complete... Freeze the clock */
regval = sam_getreg(SAM_USBHS_CTRL);
regval |= USBHS_CTRL_FRZCLK;
sam_putreg(regval, SAM_USBHS_CTRL);
}
/****************************************************************************
*
* Name: sam_sw_setup
*
****************************************************************************/
static void sam_sw_setup(struct sam_usbdev_s *priv)
{
int epno;
#ifdef CONFIG_SAMV7_USBDEVHS_SCATTERGATHER
#ifndef CONFIG_SAMV7_USBDEVHS_PREALLOCATE
int i;
/* Allocate a pool of free DMA transfer descriptors */
priv->dtdpool = (struct sam_dtd_s *)
kmm_memalign(16, CONFIG_SAMV7_USBDEVHS_NDTDS * sizeof(struct sam_dtd_s));
if (!priv->dtdpool)
{
uerr("ERROR: Failed to allocate the DMA transfer descriptor pool\n");
return NULL;
}
/* Initialize the list of free DMA transfer descriptors */
for (i = 0; i < CONFIG_SAMV7_USBDEVHS_NDTDS; i++)
{
/* Put the transfer descriptor in a free list */
sam_td_free(&priv->dtdpool[i]);
}
#else
/* Initialize the list of free DMA transfer descriptors */
DEBUGASSERT(((uintptr_t)&g_dtdpool & 15) == 0);
for (i = 0; i < CONFIG_SAMV7_USBDEVHS_NDTDS; i++)
{
/* Put the transfer descriptor in a free list */
sam_td_free(&g_dtdpool[i]);
}
#endif /* CONFIG_SAMV7_USBDEVHS_PREALLOCATE */
#endif /* CONFIG_SAMV7_USBDEVHS_SCATTERGATHER */
/* Initialize the device state structure. NOTE: many fields
* have the initial value of zero and, hence, are not explicitly
* initialized here.
*/
memset(priv, 0, sizeof(struct sam_usbdev_s));
priv->usbdev.ops = &g_devops;
priv->usbdev.ep0 = &priv->eplist[EP0].ep;
priv->epavail = SAM_EPSET_ALL & ~SAM_EP_BIT(EP0);
priv->devstate = USBHS_DEVSTATE_SUSPENDED;
priv->prevstate = USBHS_DEVSTATE_POWERED;
/* Initialize the endpoint list */
for (epno = 0; epno < SAM_USBHS_NENDPOINTS; epno++)
{
/* Set endpoint operations, reference to driver structure (not
* really necessary because there is only one controller), and
* the (physical) endpoint number which is just the index to the
* endpoint.
*/
priv->eplist[epno].ep.ops = &g_epops;
priv->eplist[epno].dev = priv;
priv->eplist[epno].ep.eplog = epno;
/* We will use a maxpacket size for supported for each endpoint */
priv->eplist[epno].ep.maxpacket = SAM_USBHS_MAXPACKETSIZE(epno);
}
#if CONFIG_USBDEV_EP0_MAXSIZE < SAM_EP0_MAXPACKET
/* Select a smaller endpoint size for EP0 if so configured */
priv->eplist[EP0].ep.maxpacket = CONFIG_USBDEV_EP0_MAXSIZE;
#endif
}
/****************************************************************************
*
* Name: sam_hw_shutdown
*
****************************************************************************/
static void sam_hw_shutdown(struct sam_usbdev_s *priv)
{
uint32_t regval;
priv->usbdev.speed = USB_SPEED_UNKNOWN;
/* Disable all interrupts */
sam_putreg(USBHS_DEVINT_ALL, SAM_USBHS_DEVIDR);
/* Clear all pending interrupt status */
sam_putreg(USBHS_DEVINT_ALL, SAM_USBHS_DEVICR);
/* DETACH=1: USBHS is detached, UTMI transceiver is suspended. */
regval = sam_getreg(SAM_USBHS_DEVCTRL);
regval |= USBHS_DEVCTRL_DETACH;
sam_putreg(regval, SAM_USBHS_DEVCTRL);
/* Freeze clocking */
regval = sam_getreg(SAM_USBHS_CTRL);
regval |= USBHS_CTRL_FRZCLK;
sam_putreg(regval, SAM_USBHS_CTRL);
/* Disable USB hardware */
regval &= ~USBHS_CTRL_USBE;
sam_putreg(regval, SAM_USBHS_CTRL);
/* Disable clocking to the USBHS peripheral */
sam_usbhs_disableclk();
}
/****************************************************************************
*
* Name: sam_sw_shutdown
*
****************************************************************************/
static void sam_sw_shutdown(struct sam_usbdev_s *priv)
{
}
/****************************************************************************
*
* Public Functions
*
****************************************************************************/
/****************************************************************************
*
* Name: arm_usbinitialize
* Description:
* Initialize the USB driver
* Input Parameters:
* None
*
* Returned Value:
* None
*
****************************************************************************/
void arm_usbinitialize(void)
{
/* For now there is only one USB controller, but we will always refer to
* it using a pointer to make any future ports to multiple USB controllers
* easier.
*/
struct sam_usbdev_s *priv = &g_usbhs;
usbtrace(TRACE_DEVINIT, 0);
/* Software initialization */
sam_sw_setup(priv);
/* Power up and initialize USB controller. Interrupts from the USBHS
* controller are initialized here, but will not be enabled at the NVIC
* until the class driver is installed.
*/
sam_hw_setup(priv);
/* Attach USB controller interrupt handlers. The hardware will not be
* initialized and interrupts will not be enabled until the class device
* driver is bound. Getting the IRQs here only makes sure that we have
* them when we need them later.
*/
if (irq_attach(SAM_IRQ_USBHS, sam_usbhs_interrupt, NULL) != 0)
{
usbtrace(TRACE_DEVERROR(SAM_TRACEERR_IRQREGISTRATION),
(uint16_t)SAM_IRQ_USBHS);
goto errout;
}
/* Enable USB controller interrupts at the NVIC. Interrupts are still
* disabled at the USBHS.
*/
up_enable_irq(SAM_IRQ_USBHS);
return;
errout:
arm_usbuninitialize();
}
/****************************************************************************
*
* Name: arm_usbuninitialize
* Description:
* Initialize the USB driver
* Input Parameters:
* None
*
* Returned Value:
* None
*
****************************************************************************/
void arm_usbuninitialize(void)
{
struct sam_usbdev_s *priv = &g_usbhs;
irqstate_t flags;
/* For now there is only one USB controller, but we will always refer to
* it using a pointer to make any future ports to multiple USB controllers
* easier.
*/
flags = enter_critical_section();
usbtrace(TRACE_DEVUNINIT, 0);
/* Disable and detach the USBHS IRQ */
up_disable_irq(SAM_IRQ_USBHS);
irq_detach(SAM_IRQ_USBHS);
if (priv->driver)
{
usbtrace(TRACE_DEVERROR(SAM_TRACEERR_DRIVERREGISTERED), 0);
usbdev_unregister(priv->driver);
}
/* Put the hardware in an inactive state */
sam_hw_shutdown(priv);
sam_sw_shutdown(priv);
leave_critical_section(flags);
}
/****************************************************************************
*
* Name: usbdev_register
*
* Description:
* Register a USB device class driver.
* The class driver's bind() method will be
* called to bind it to a USB device driver.
*
****************************************************************************/
int usbdev_register(struct usbdevclass_driver_s *driver)
{
/* For now there is only one USB controller, but we will always refer to
* it using a pointer to make any future ports to multiple USB controllers
* easier.
*/
struct sam_usbdev_s *priv = &g_usbhs;
int ret;
usbtrace(TRACE_DEVREGISTER, 0);
DEBUGASSERT(driver != NULL &&
driver->ops->bind != NULL &&
driver->ops->unbind != NULL &&
driver->ops->disconnect != NULL &&
driver->ops->setup != NULL);
DEBUGASSERT(priv->driver == NULL);
/* First hook up the driver */
priv->driver = driver;
/* Then bind the class driver */
ret = CLASS_BIND(driver, &priv->usbdev);
if (ret != OK)
{
usbtrace(TRACE_DEVERROR(SAM_TRACEERR_BINDFAILED), (uint16_t)-ret);
priv->driver = NULL;
}
return ret;
}
/****************************************************************************
*
* Name: usbdev_unregister
*
* Description:
* Un-register usbdev class driver. If the USB device is connected to a
* USB host, it will first disconnect(). The driver is also requested to
* unbind() and clean up any device state, before this procedure finally
* returns.
*
****************************************************************************/
int usbdev_unregister(struct usbdevclass_driver_s *driver)
{
/* For now there is only one USB controller, but we will always refer to
* it using a pointer to make any future ports to multiple USB controllers
* easier.
*/
struct sam_usbdev_s *priv = &g_usbhs;
irqstate_t flags;
usbtrace(TRACE_DEVUNREGISTER, 0);
DEBUGASSERT(driver == priv->driver);
/* Reset the hardware and cancel all requests. All requests must be
* canceled while the class driver is still bound.
*/
flags = enter_critical_section();
/* Unbind the class driver */
CLASS_UNBIND(driver, &priv->usbdev);
/* Disable USB controller interrupts (but keep them attached) */
up_disable_irq(SAM_IRQ_USBHS);
/* Put the hardware in an inactive state. Then bring the hardware back up
* in the initial state. This is essentially the same state as we were
* in when arm_usbinitialize() was first called.
*/
sam_hw_shutdown(priv);
sam_sw_shutdown(priv);
sam_sw_setup(priv);
sam_hw_setup(priv);
/* Unhook the driver */
priv->driver = NULL;
leave_critical_section(flags);
return OK;
}
#endif /* CONFIG_USBDEV && CONFIG_SAMV7_USBDEVHS */