/************************************************************************************ * configs/sama5d3-xplained/include/board_sdram.h * * Copyright (C) 2014 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * 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 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. * ************************************************************************************/ #ifndef __CONFIGS_SAMA5D3_XPLAINED_INCLUDE_BOARD_SDRAM_H #define __CONFIGS_SAMA5D3_XPLAINED_INCLUDE_BOARD_SDRAM_H /************************************************************************************ * Included Files ************************************************************************************/ #include #include "sam_pmc.h" /************************************************************************************ * Definitions ************************************************************************************/ /* Clocking *************************************************************************/ /* After power-on reset, the SAMA5 device is running on a 12MHz 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 in 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)) /* On some SAMA5's, the clocking to peripherals may be divided down from MCK, * but not for the SAMA5D3. */ #define BOARD_PIT_FREQUENCY BOARD_MCK_FREQUENCY #define BOARD_USART_FREQUENCY BOARD_MCK_FREQUENCY #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 */ /* REVISIT: The divisor of 10 produces a rate that is too high. Division * by 5, however, seems to work just fine. No idea why? */ # define BOARD_UPLL_OHCI_DIV (5) /* Divide by 5 */ #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 1µs at 8MHz */ #define BOARD_TSD_DEBOUNCE (10000000) /* 10 milliseconds (units nanoseconds) */ /* HSMCI 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 /* __CONFIGS_SAMA5D3_XPLAINED_INCLUDE_BOARD_SDRAM_H */