493b8de938
This reverts commit f735584514.
These header changes introduce unacceptable errors:
1. The changes alter the width of the initial block comment. That will cause nxstyle failures on most of the files.
2. The third line of the header is an (optional) short description of content of the the file. This change erroneously removes that line.
Automated header file changes can screw up a lot of files, very quickly.
183 lines
7.0 KiB
C
183 lines
7.0 KiB
C
/****************************************************************************
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* boards/arm/sama5/sama5d2-xult/include/board_sdram.h
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*
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* Copyright (C) 2015 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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#ifndef __BOARDS_ARM_SAMA5_SAMA5D2_XULT_INCLUDE_BOARD_SDRAM_H
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#define __BOARDS_ARM_SAMA5_SAMA5D2_XULT_INCLUDE_BOARD_SDRAM_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include "sam_pmc.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Clocking *****************************************************************/
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/* After power-on reset, the SAMA5 device is running on a 12MHz internal RC.
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* When booting from SDRAM, NuttX is loaded in SDRAM by an intermediate
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* bootloader. That bootloader had to have already configured the PLL
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* and SDRAM for proper operation.
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*
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* In this case, we do not reconfigure the clocking.
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* Rather, we need to query the register settings to determine the clock
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* frequencies.
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* We can only assume that the Main clock source is the on-board 12MHz
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* crystal.
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*/
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#define BOARD_MAINCK_FREQUENCY BOARD_MAINOSC_FREQUENCY
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#define BOARD_PLLA_FREQUENCY (sam_pllack_frequency(BOARD_MAINOSC_FREQUENCY))
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#define BOARD_PLLADIV2_FREQUENCY (sam_plladiv2_frequency(BOARD_MAINOSC_FREQUENCY))
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#define BOARD_PCK_FREQUENCY (sam_pck_frequency(BOARD_MAINOSC_FREQUENCY))
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#define BOARD_MCK_FREQUENCY (sam_mck_frequency(BOARD_MAINOSC_FREQUENCY))
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/* Clocking to certain peripherals may be MCK/2.
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*
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* REVISIT: I am not sure why this is. Perhaps because of H32MXDIV?
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*/
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#define BOARD_PIT_FREQUENCY (BOARD_MCK_FREQUENCY >> 1)
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#define BOARD_USART_FREQUENCY (BOARD_MCK_FREQUENCY >> 1)
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#define BOARD_FLEXCOM_FREQUENCY (BOARD_MCK_FREQUENCY >> 1)
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#if defined(CONFIG_SAMA5_EHCI) || defined(CONFIG_SAMA5_OHCI) || \
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defined(CONFIG_SAMA5_UDPHS)
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/* The USB Host High Speed requires a 480 MHz clock (UPLLCK) for the embedded
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* High-speed transceivers. UPLLCK is the output of the 480 MHz UTMI PLL
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* (UPLL). The source clock of the UTMI PLL is the Main OSC output: Either
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* the 12MHz internal RC oscillator on a an external 12MHz crystal. The
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* Main OSC must be 12MHz because the UPLL has a built-in 40x multiplier.
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*
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* For High-speed operations, the user has to perform the following:
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*
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* 1) Enable UHP peripheral clock, bit (1 << AT91C_ID_UHPHS) in
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* PMC_PCER register.
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* 2) Write CKGR_PLLCOUNT field in PMC_UCKR register.
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* 3) Enable UPLL, bit AT91C_CKGR_UPLLEN in PMC_UCKR register.
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* 4) Wait until UTMI_PLL is locked. LOCKU bit in PMC_SR register
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* 5) Enable BIAS, bit AT91C_CKGR_BIASEN in PMC_UCKR register.
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* 6) Select UPLLCK as Input clock of OHCI part, USBS bit in PMC_USB
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* register.
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* 7) Program the OHCI clocks (UHP48M and UHP12M) with USBDIV field in
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* PMC_USB register. USBDIV must be 9 (division by 10) if UPLLCK is
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* selected.
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* 8) Enable OHCI clocks, UHP bit in PMC_SCER register.
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*
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* Steps 2 through 7 performed here. 1 and 8 are performed in the EHCI
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* driver is initialized.
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*/
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# define BOARD_USE_UPLL 1 /* Use UPLL for clock source */
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# define BOARD_CKGR_UCKR_UPLLCOUNT (15) /* Maximum value */
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# define BOARD_CKGR_UCKR_BIASCOUNT (15) /* Maximum value */
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# define BOARD_UPLL_OHCI_DIV (10) /* Divide by 10 */
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#endif
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/* ADC Configuration
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*
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* ADCClock = MCK / ((PRESCAL+1) * 2)
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* PRESCAL = (MCK / (2 * ADCClock) - 1)
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*/
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#define BOARD_ADCCLK_FREQUENCY (8000000) /* ADCCLK: MCK / ((7+1)*2) */
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#define BOARD_ADCCLK_FREQUENCY \
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((BOARD_PLLADIV2_FREQUENCY / (2 *BOARD_PLLADIV2_FREQUENCY)) - 1)
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#define BOARD_ADC_PRESCAL (7)
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#define BOARD_TSD_STARTUP (40) /* 40 nanoseconds */
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#define BOARD_TSD_TRACKTIM (2000) /* Min 1<>s at 8MHz */
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#define BOARD_TSD_DEBOUNCE (10000000) /* 10 milliseconds (units nanoseconds) */
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/* HSMCI clocking
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*
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* Multimedia Card Interface clock (MCCK or MCI_CK) is Master Clock (MCK)
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* divided by (2*(CLKDIV) + CLOCKODD + 2).
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*
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* CLKFULLDIV = 2*CLKDIV + CLOCKODD;
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* MCI_SPEED = MCK / (CLKFULLDIV + 2)
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* CLKFULLDIV = MCK / MCI_SPEED - 2
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*
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* CLKDIV = CLKFULLDIV >> 1
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* CLOCKODD = CLKFULLDIV & 1
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*
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* Where CLKDIV has a range of 0-255.
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*/
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/* Initial clock: 400 KHz (target) */
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#define HSMCI_INIT_CLKDIV sam_hsmci_clkdiv(400000)
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/* MMC transfer clock: 20 MHz (target) */
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#define HSMCI_MMCXFR_CLKDIV sam_hsmci_clkdiv(20000000)
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/* SD transfer clock: 25 MHz (target) */
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#define HSMCI_SDXFR_CLKDIV sam_hsmci_clkdiv(25000000)
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#define HSMCI_SDWIDEXFR_CLKDIV HSMCI_SDXFR_CLKDIV
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/****************************************************************************
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* Public Data
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****************************************************************************/
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#ifndef __ASSEMBLY__
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#undef EXTERN
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#if defined(__cplusplus)
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#define EXTERN extern "C"
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extern "C"
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{
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#else
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#define EXTERN extern
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#endif
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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#undef EXTERN
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#if defined(__cplusplus)
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}
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#endif
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#endif /* !__ASSEMBLY__ */
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#endif /* __BOARDS_ARM_SAMA5_SAMA5D2_XULT_INCLUDE_BOARD_SDRAM_H */
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