| /**************************************************************************** |
| * boards/arm/sama5/giant-board/include/board_sdram.h |
| * |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. The |
| * ASF licenses this file to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance with the |
| * License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the |
| * License for the specific language governing permissions and limitations |
| * under the License. |
| * |
| ****************************************************************************/ |
| |
| #ifndef __BOARDS_ARM_SAMA5_GIANT_BOARD_INCLUDE_BOARD_SDRAM_H |
| #define __BOARDS_ARM_SAMA5_GIANT_BOARD_INCLUDE_BOARD_SDRAM_H |
| |
| /**************************************************************************** |
| * Included Files |
| ****************************************************************************/ |
| |
| #include <nuttx/config.h> |
| |
| /**************************************************************************** |
| * Pre-processor Definitions |
| ****************************************************************************/ |
| |
| /* Clocking *****************************************************************/ |
| |
| /* After power-on reset, the SAMA5 device is running on a 24MHz internal RC. |
| * When booting from SDRAM, NuttX is loaded in SDRAM by an intermediate |
| * bootloader. That bootloader had to have already configured the PLL |
| * and SDRAM for proper operation. |
| * |
| * In this case, we do not reconfigure the clocking. |
| * Rather, we need to query the register settings to determine the clock |
| * frequencies. |
| * We can only assume that the Main clock source is the on-board 12MHz |
| * crystal. |
| */ |
| |
| #define BOARD_MAINCK_FREQUENCY BOARD_MAINOSC_FREQUENCY |
| #define BOARD_PLLA_FREQUENCY (sam_pllack_frequency(BOARD_MAINOSC_FREQUENCY)) |
| #define BOARD_PLLADIV2_FREQUENCY (sam_plladiv2_frequency(BOARD_MAINOSC_FREQUENCY)) |
| #define BOARD_PCK_FREQUENCY (sam_pck_frequency(BOARD_MAINOSC_FREQUENCY)) |
| #define BOARD_MCK_FREQUENCY (sam_mck_frequency(BOARD_MAINOSC_FREQUENCY)) |
| |
| /* Clocking to certain peripherals may be MCK/2. |
| * |
| * REVISIT: I am not sure why this is. Perhaps because of H32MXDIV? |
| */ |
| |
| #define BOARD_PIT_FREQUENCY (BOARD_MCK_FREQUENCY >> 1) |
| #define BOARD_USART_FREQUENCY (BOARD_MCK_FREQUENCY >> 1) |
| #define BOARD_FLEXCOM_FREQUENCY (BOARD_MCK_FREQUENCY >> 1) |
| |
| #if defined(CONFIG_SAMA5_EHCI) || defined(CONFIG_SAMA5_OHCI) || \ |
| defined(CONFIG_SAMA5_UDPHS) |
| |
| /* The USB Host High Speed requires a 480 MHz clock (UPLLCK) for the embedded |
| * High-speed transceivers. UPLLCK is the output of the 480 MHz UTMI PLL |
| * (UPLL). The source clock of the UTMI PLL is the Main OSC output: Either |
| * the 12MHz internal RC oscillator on a an external 12MHz crystal. The |
| * Main OSC must be 12MHz because the UPLL has a built-in 40x multiplier. |
| * |
| * For High-speed operations, the user has to perform the following: |
| * |
| * 1) Enable UHP peripheral clock, bit (1 << AT91C_ID_UHPHS) in |
| * PMC_PCER register. |
| * 2) Write CKGR_PLLCOUNT field in PMC_UCKR register. |
| * 3) Enable UPLL, bit AT91C_CKGR_UPLLEN in PMC_UCKR register. |
| * 4) Wait until UTMI_PLL is locked. LOCKU bit in PMC_SR register |
| * 5) Enable BIAS, bit AT91C_CKGR_BIASEN in PMC_UCKR register. |
| * 6) Select UPLLCK as Input clock of OHCI part, USBS bit in PMC_USB |
| * register. |
| * 7) Program the OHCI clocks (UHP48M and UHP12M) with USBDIV field in |
| * PMC_USB register. USBDIV must be 9 (division by 10) if UPLLCK is |
| * selected. |
| * 8) Enable OHCI clocks, UHP bit in PMC_SCER register. |
| * |
| * Steps 2 through 7 performed here. 1 and 8 are performed in the EHCI |
| * driver is initialized. |
| */ |
| |
| # define BOARD_USE_UPLL 1 /* Use UPLL for clock source */ |
| # define BOARD_CKGR_UCKR_UPLLCOUNT (15) /* Maximum value */ |
| # define BOARD_CKGR_UCKR_BIASCOUNT (15) /* Maximum value */ |
| # define BOARD_UPLL_OHCI_DIV (10) /* Divide by 10 */ |
| #endif |
| |
| /* ADC Configuration |
| * |
| * ADCClock = MCK / ((PRESCAL+1) * 2) |
| * PRESCAL = (MCK / (2 * ADCClock) - 1) |
| */ |
| |
| #define BOARD_ADCCLK_FREQUENCY (8000000) /* ADCCLK: MCK / ((7+1)*2) */ |
| #define BOARD_ADCCLK_FREQUENCY \ |
| ((BOARD_PLLADIV2_FREQUENCY / (2 *BOARD_PLLADIV2_FREQUENCY)) - 1) |
| |
| #define BOARD_ADC_PRESCAL (7) |
| #define BOARD_TSD_STARTUP (40) /* 40 nanoseconds */ |
| #define BOARD_TSD_TRACKTIM (2000) /* Min 1�s at 8MHz */ |
| #define BOARD_TSD_DEBOUNCE (10000000) /* 10 milliseconds (units nanoseconds) */ |
| |
| /* SDMMC clocking |
| * |
| * Multimedia Card Interface clock (MCCK or MCI_CK) is Master Clock (MCK) |
| * divided by (2*(CLKDIV) + CLOCKODD + 2). |
| * |
| * CLKFULLDIV = 2*CLKDIV + CLOCKODD; |
| * MCI_SPEED = MCK / (CLKFULLDIV + 2) |
| * CLKFULLDIV = MCK / MCI_SPEED - 2 |
| * |
| * CLKDIV = CLKFULLDIV >> 1 |
| * CLOCKODD = CLKFULLDIV & 1 |
| * |
| * Where CLKDIV has a range of 0-255. |
| */ |
| |
| /* Initial clock: 400 KHz (target) */ |
| |
| #define HSMCI_INIT_CLKDIV sam_hsmci_clkdiv(400000) |
| |
| /* MMC transfer clock: 20 MHz (target) */ |
| |
| #define HSMCI_MMCXFR_CLKDIV sam_hsmci_clkdiv(20000000) |
| |
| /* SD transfer clock: 25 MHz (target) */ |
| |
| #define HSMCI_SDXFR_CLKDIV sam_hsmci_clkdiv(25000000) |
| |
| #define HSMCI_SDWIDEXFR_CLKDIV HSMCI_SDXFR_CLKDIV |
| |
| /**************************************************************************** |
| * Public Data |
| ****************************************************************************/ |
| |
| #ifndef __ASSEMBLY__ |
| |
| #undef EXTERN |
| #if defined(__cplusplus) |
| #define EXTERN extern "C" |
| extern "C" |
| { |
| #else |
| #define EXTERN extern |
| #endif |
| |
| /**************************************************************************** |
| * Public Function Prototypes |
| ****************************************************************************/ |
| |
| #undef EXTERN |
| #if defined(__cplusplus) |
| } |
| #endif |
| |
| #endif /* !__ASSEMBLY__ */ |
| #endif /* __BOARDS_ARM_SAMA5_GIANT_BOARD_INCLUDE_BOARD_SDRAM_H */ |
