274 lines
7.6 KiB
C
274 lines
7.6 KiB
C
/*
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ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
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2011 Giovanni Di Sirio.
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This file is part of ChibiOS/RT.
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ChibiOS/RT is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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ChibiOS/RT is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* @file STM32/sdc_lld.c
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* @brief STM32 SDC subsystem low level driver source.
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*
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* @addtogroup SDC
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* @{
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*/
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#include "ch.h"
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#include "hal.h"
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#if HAL_USE_SDC || defined(__DOXYGEN__)
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/*===========================================================================*/
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/* Driver exported variables. */
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/*===========================================================================*/
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/** @brief SDCD1 driver identifier.*/
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SDCDriver SDCD1;
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/*===========================================================================*/
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/* Driver local variables. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver local functions. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver interrupt handlers. */
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/*===========================================================================*/
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/**
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* @brief SDIO IRQ handler.
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*
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* @isr
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*/
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CH_IRQ_HANDLER(SDIO_IRQHandler) {
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CH_IRQ_PROLOGUE();
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CH_IRQ_EPILOGUE();
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}
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/*===========================================================================*/
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/* Driver exported functions. */
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/*===========================================================================*/
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/**
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* @brief Low level SDC driver initialization.
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*
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* @notapi
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*/
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void sdc_lld_init(void) {
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sdcObjectInit(&SDCD1);
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}
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/**
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* @brief Configures and activates the SDC peripheral.
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*
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* @param[in] sdcp pointer to the @p SDCDriver object
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*
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* @notapi
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*/
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void sdc_lld_start(SDCDriver *sdcp) {
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if (sdcp->state == SDC_STOP) {
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/* Note, the DMA must be enabled before the IRQs.*/
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dmaAllocate(STM32_DMA2_ID, STM32_DMA_CHANNEL_4, NULL, NULL);
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NVICEnableVector(SDIO_IRQn,
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CORTEX_PRIORITY_MASK(STM32_SDC_SDIO_IRQ_PRIORITY));
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RCC->AHBENR |= RCC_AHBENR_SDIOEN;
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}
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/* Configuration, card clock is initially stopped.*/
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SDIO->POWER = 0;
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SDIO->CLKCR = 0;
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SDIO->DCTRL = 0;
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}
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/**
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* @brief Deactivates the SDC peripheral.
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*
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* @param[in] sdcp pointer to the @p SDCDriver object
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*
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* @notapi
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*/
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void sdc_lld_stop(SDCDriver *sdcp) {
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if ((sdcp->state == SDC_READY) || (sdcp->state == SDC_ACTIVE)) {
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SDIO->POWER = 0;
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SDIO->CLKCR = 0;
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SDIO->DCTRL = 0;
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/* Clock deactivation.*/
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NVICDisableVector(SDIO_IRQn);
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dmaRelease(STM32_DMA2_ID, STM32_DMA_CHANNEL_4);
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}
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}
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/**
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* @brief Starts the SDIO clock and sets it to init mode (400KHz or less).
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*
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* @param[in] sdcp pointer to the @p SDCDriver object
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*
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* @notapi
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*/
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void sdc_lld_start_clk(SDCDriver *sdcp) {
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(void)sdcp;
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/* Initial clock setting: 400KHz, 1bit mode.*/
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SDIO->CLKCR = STM32_SDIO_DIV_LS;
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SDIO->POWER |= SDIO_POWER_PWRCTRL_0 | SDIO_POWER_PWRCTRL_1;
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SDIO->CLKCR |= SDIO_CLKCR_CLKEN;
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}
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/**
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* @brief Sets the SDIO clock to data mode (25MHz or less).
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*
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* @param[in] sdcp pointer to the @p SDCDriver object
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*
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* @notapi
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*/
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void sdc_lld_set_data_clk(SDCDriver *sdcp) {
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(void)sdcp;
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SDIO->CLKCR = (SDIO->CLKCR & 0xFFFFFF00) | STM32_SDIO_DIV_HS;
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}
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/**
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* @brief Stops the SDIO clock.
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*
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* @param[in] sdcp pointer to the @p SDCDriver object
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*
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* @notapi
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*/
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void sdc_lld_stop_clk(SDCDriver *sdcp) {
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(void)sdcp;
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SDIO->CLKCR = 0;
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SDIO->POWER = 0;
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}
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/**
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* @brief Switches the bus to 4 bits mode.
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*
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* @param[in] sdcp pointer to the @p SDCDriver object
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*
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* @notapi
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*/
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void sdc_lld_set_bus_mode(SDCDriver *sdcp, sdcbusmode_t mode) {
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uint32_t clk = SDIO->CLKCR & ~SDIO_CLKCR_WIDBUS;
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(void)sdcp;
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switch (mode) {
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case SDC_MODE_1BIT:
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SDIO->CLKCR = clk;
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break;
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case SDC_MODE_4BIT:
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SDIO->CLKCR = clk | SDIO_CLKCR_WIDBUS_0;
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break;
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case SDC_MODE_8BIT:
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SDIO->CLKCR = clk | SDIO_CLKCR_WIDBUS_1;
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}
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}
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/**
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* @brief Sends an SDIO command with no response expected.
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*
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* @param[in] sdcp pointer to the @p SDCDriver object
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* @param[in[ cmd card command
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* @param[in] arg command argument
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*
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* @notapi
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*/
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void sdc_lld_send_cmd_none(SDCDriver *sdcp, uint8_t cmd, uint32_t arg) {
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(void)sdcp;
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SDIO->ARG = arg;
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SDIO->CMD = (uint32_t)cmd | SDIO_CMD_CPSMEN;
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while ((SDIO->STA & SDIO_STA_CMDSENT) == 0)
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;
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SDIO->ICR = 0xFFFFFFFF;
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}
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/**
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* @brief Sends an SDIO command with a short response expected.
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*
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* @param[in] sdcp pointer to the @p SDCDriver object
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* @param[in[ cmd card command
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* @param[in] arg command argument
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* @param[out] resp pointer to the response buffer (one word)
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* @return The operation status.
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* @retval FALSE the operation succeeded.
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* @retval TRUE the operation failed because timeout, CRC check or
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* other errors.
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*
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* @notapi
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*/
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bool_t sdc_lld_send_cmd_short(SDCDriver *sdcp, uint8_t cmd, uint32_t arg,
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uint32_t *resp) {
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uint32_t sta;
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(void)sdcp;
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SDIO->ARG = arg;
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SDIO->CMD = (uint32_t)cmd | SDIO_CMD_WAITRESP_0 | SDIO_CMD_CPSMEN;
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while (((sta = SDIO->STA) & (SDIO_STA_CMDREND | SDIO_STA_CTIMEOUT |
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SDIO_STA_CCRCFAIL)) == 0)
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;
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SDIO->ICR = 0xFFFFFFFF;
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if ((sta & (SDIO_STA_CTIMEOUT | SDIO_STA_CCRCFAIL)) != 0)
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return TRUE;
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*resp = SDIO->RESP1;
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return FALSE;
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}
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/**
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* @brief Sends an SDIO command with a long response expected.
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*
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* @param[in] sdcp pointer to the @p SDCDriver object
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* @param[in[ cmd card command
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* @param[in] arg command argument
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* @param[out] resp pointer to the response buffer (four words)
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* @return The operation status.
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* @retval FALSE the operation succeeded.
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* @retval TRUE the operation failed because timeout, CRC check or
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* other errors.
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*
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* @notapi
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*/
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bool_t sdc_lld_send_cmd_long(SDCDriver *sdcp, uint8_t cmd, uint32_t arg,
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uint32_t *resp) {
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uint32_t sta;
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(void)sdcp;
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SDIO->ARG = arg;
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SDIO->CMD = (uint32_t)cmd | SDIO_CMD_WAITRESP_0 | SDIO_CMD_WAITRESP_1 |
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SDIO_CMD_CPSMEN;
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while (((sta = SDIO->STA) & (SDIO_STA_CMDREND | SDIO_STA_CTIMEOUT |
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SDIO_STA_CCRCFAIL)) == 0)
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;
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SDIO->ICR = 0xFFFFFFFF;
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if ((sta & (SDIO_STA_CTIMEOUT | SDIO_STA_CCRCFAIL)) != 0)
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return TRUE;
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*resp = SDIO->RESP1;
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return FALSE;
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}
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#endif /* HAL_USE_SDC */
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/** @} */
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