// SPDX-License-Identifier: GPL-2.0 /* * bcm2835 sdhost driver. * * The 2835 has two SD controllers: The Arasan sdhci controller * (supported by the iproc driver) and a custom sdhost controller * (supported by this driver). * * The sdhci controller supports both sdcard and sdio. The sdhost * controller supports the sdcard only, but has better performance. * Also note that the rpi3 has sdio wifi, so driving the sdcard with * the sdhost controller allows to use the sdhci controller for wifi * support. * * The configuration is done by devicetree via pin muxing. Both * SD controller are available on the same pins (2 pin groups = pin 22 * to 27 + pin 48 to 53). So it's possible to use both SD controllers * at the same time with different pin groups. * * Author: Phil Elwell <[email protected]> * Copyright (C) 2015-2016 Raspberry Pi (Trading) Ltd. * * Based on * mmc-bcm2835.c by Gellert Weisz * which is, in turn, based on * sdhci-bcm2708.c by Broadcom * sdhci-bcm2835.c by Stephen Warren and Oleksandr Tymoshenko * sdhci.c and sdhci-pci.c by Pierre Ossman */ #include <linux/clk.h> #include <linux/delay.h> #include <linux/device.h> #include <linux/dmaengine.h> #include <linux/dma-mapping.h> #include <linux/err.h> #include <linux/highmem.h> #include <linux/interrupt.h> #include <linux/io.h> #include <linux/iopoll.h> #include <linux/module.h> #include <linux/of_address.h> #include <linux/of_irq.h> #include <linux/platform_device.h> #include <linux/scatterlist.h> #include <linux/time.h> #include <linux/workqueue.h> #include <linux/mmc/host.h> #include <linux/mmc/mmc.h> #include <linux/mmc/sd.h> #define SDCMD … #define SDARG … #define SDTOUT … #define SDCDIV … #define SDRSP0 … #define SDRSP1 … #define SDRSP2 … #define SDRSP3 … #define SDHSTS … #define SDVDD … #define SDEDM … #define SDHCFG … #define SDHBCT … #define SDDATA … #define SDHBLC … #define SDCMD_NEW_FLAG … #define SDCMD_FAIL_FLAG … #define SDCMD_BUSYWAIT … #define SDCMD_NO_RESPONSE … #define SDCMD_LONG_RESPONSE … #define SDCMD_WRITE_CMD … #define SDCMD_READ_CMD … #define SDCMD_CMD_MASK … #define SDCDIV_MAX_CDIV … #define SDHSTS_BUSY_IRPT … #define SDHSTS_BLOCK_IRPT … #define SDHSTS_SDIO_IRPT … #define SDHSTS_REW_TIME_OUT … #define SDHSTS_CMD_TIME_OUT … #define SDHSTS_CRC16_ERROR … #define SDHSTS_CRC7_ERROR … #define SDHSTS_FIFO_ERROR … /* Reserved */ /* Reserved */ #define SDHSTS_DATA_FLAG … #define SDHSTS_TRANSFER_ERROR_MASK … #define SDHSTS_ERROR_MASK … #define SDHCFG_BUSY_IRPT_EN … #define SDHCFG_BLOCK_IRPT_EN … #define SDHCFG_SDIO_IRPT_EN … #define SDHCFG_DATA_IRPT_EN … #define SDHCFG_SLOW_CARD … #define SDHCFG_WIDE_EXT_BUS … #define SDHCFG_WIDE_INT_BUS … #define SDHCFG_REL_CMD_LINE … #define SDVDD_POWER_OFF … #define SDVDD_POWER_ON … #define SDEDM_FORCE_DATA_MODE … #define SDEDM_CLOCK_PULSE … #define SDEDM_BYPASS … #define SDEDM_WRITE_THRESHOLD_SHIFT … #define SDEDM_READ_THRESHOLD_SHIFT … #define SDEDM_THRESHOLD_MASK … #define SDEDM_FSM_MASK … #define SDEDM_FSM_IDENTMODE … #define SDEDM_FSM_DATAMODE … #define SDEDM_FSM_READDATA … #define SDEDM_FSM_WRITEDATA … #define SDEDM_FSM_READWAIT … #define SDEDM_FSM_READCRC … #define SDEDM_FSM_WRITECRC … #define SDEDM_FSM_WRITEWAIT1 … #define SDEDM_FSM_POWERDOWN … #define SDEDM_FSM_POWERUP … #define SDEDM_FSM_WRITESTART1 … #define SDEDM_FSM_WRITESTART2 … #define SDEDM_FSM_GENPULSES … #define SDEDM_FSM_WRITEWAIT2 … #define SDEDM_FSM_STARTPOWDOWN … #define SDDATA_FIFO_WORDS … #define FIFO_READ_THRESHOLD … #define FIFO_WRITE_THRESHOLD … #define SDDATA_FIFO_PIO_BURST … #define PIO_THRESHOLD … struct bcm2835_host { … }; static void bcm2835_dumpcmd(struct bcm2835_host *host, struct mmc_command *cmd, const char *label) { … } static void bcm2835_dumpregs(struct bcm2835_host *host) { … } static void bcm2835_reset_internal(struct bcm2835_host *host) { … } static void bcm2835_reset(struct mmc_host *mmc) { … } static void bcm2835_finish_command(struct bcm2835_host *host); static void bcm2835_wait_transfer_complete(struct bcm2835_host *host) { … } static void bcm2835_dma_complete(void *param) { … } static void bcm2835_transfer_block_pio(struct bcm2835_host *host, bool is_read) { … } static void bcm2835_transfer_pio(struct bcm2835_host *host) { … } static void bcm2835_prepare_dma(struct bcm2835_host *host, struct mmc_data *data) { … } static void bcm2835_start_dma(struct bcm2835_host *host) { … } static void bcm2835_set_transfer_irqs(struct bcm2835_host *host) { … } static void bcm2835_prepare_data(struct bcm2835_host *host, struct mmc_command *cmd) { … } static u32 bcm2835_read_wait_sdcmd(struct bcm2835_host *host, u32 max_ms) { … } static void bcm2835_finish_request(struct bcm2835_host *host) { … } static bool bcm2835_send_command(struct bcm2835_host *host, struct mmc_command *cmd) { … } static void bcm2835_transfer_complete(struct bcm2835_host *host) { … } static void bcm2835_finish_data(struct bcm2835_host *host) { … } static void bcm2835_finish_command(struct bcm2835_host *host) { … } static void bcm2835_timeout(struct work_struct *work) { … } static bool bcm2835_check_cmd_error(struct bcm2835_host *host, u32 intmask) { … } static void bcm2835_check_data_error(struct bcm2835_host *host, u32 intmask) { … } static void bcm2835_busy_irq(struct bcm2835_host *host) { … } static void bcm2835_data_irq(struct bcm2835_host *host, u32 intmask) { … } static void bcm2835_data_threaded_irq(struct bcm2835_host *host) { … } static void bcm2835_block_irq(struct bcm2835_host *host) { … } static irqreturn_t bcm2835_irq(int irq, void *dev_id) { … } static irqreturn_t bcm2835_threaded_irq(int irq, void *dev_id) { … } static void bcm2835_dma_complete_work(struct work_struct *work) { … } static void bcm2835_set_clock(struct bcm2835_host *host, unsigned int clock) { … } static void bcm2835_request(struct mmc_host *mmc, struct mmc_request *mrq) { … } static void bcm2835_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) { … } static const struct mmc_host_ops bcm2835_ops = …; static int bcm2835_add_host(struct bcm2835_host *host) { … } static int bcm2835_probe(struct platform_device *pdev) { … } static void bcm2835_remove(struct platform_device *pdev) { … } static const struct of_device_id bcm2835_match[] = …; MODULE_DEVICE_TABLE(of, bcm2835_match); static struct platform_driver bcm2835_driver = …; module_platform_driver(…) …; MODULE_ALIAS(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …; MODULE_AUTHOR(…) …;
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