// SPDX-License-Identifier: GPL-2.0 /* * Driver for the MMC / SD / SDIO IP found in: * * TC6393XB, TC6391XB, TC6387XB, T7L66XB, ASIC3, SH-Mobile SoCs * * Copyright (C) 2015-19 Renesas Electronics Corporation * Copyright (C) 2016-19 Sang Engineering, Wolfram Sang * Copyright (C) 2017 Horms Solutions, Simon Horman * Copyright (C) 2011 Guennadi Liakhovetski * Copyright (C) 2007 Ian Molton * Copyright (C) 2004 Ian Molton * * This driver draws mainly on scattered spec sheets, Reverse engineering * of the toshiba e800 SD driver and some parts of the 2.4 ASIC3 driver (4 bit * support). (Further 4 bit support from a later datasheet). * * TODO: * Investigate using a workqueue for PIO transfers * Eliminate FIXMEs * Better Power management * Handle MMC errors better * double buffer support * */ #include <linux/delay.h> #include <linux/device.h> #include <linux/dma-mapping.h> #include <linux/highmem.h> #include <linux/interrupt.h> #include <linux/io.h> #include <linux/irq.h> #include <linux/mmc/card.h> #include <linux/mmc/host.h> #include <linux/mmc/mmc.h> #include <linux/mmc/slot-gpio.h> #include <linux/module.h> #include <linux/of.h> #include <linux/pagemap.h> #include <linux/platform_data/tmio.h> #include <linux/platform_device.h> #include <linux/pm_qos.h> #include <linux/pm_runtime.h> #include <linux/regulator/consumer.h> #include <linux/mmc/sdio.h> #include <linux/scatterlist.h> #include <linux/sizes.h> #include <linux/spinlock.h> #include <linux/workqueue.h> #include "tmio_mmc.h" static inline void tmio_mmc_start_dma(struct tmio_mmc_host *host, struct mmc_data *data) { … } static inline void tmio_mmc_end_dma(struct tmio_mmc_host *host) { … } static inline void tmio_mmc_enable_dma(struct tmio_mmc_host *host, bool enable) { … } static inline void tmio_mmc_request_dma(struct tmio_mmc_host *host, struct tmio_mmc_data *pdata) { … } static inline void tmio_mmc_release_dma(struct tmio_mmc_host *host) { … } static inline void tmio_mmc_abort_dma(struct tmio_mmc_host *host) { … } static inline void tmio_mmc_dataend_dma(struct tmio_mmc_host *host) { … } void tmio_mmc_enable_mmc_irqs(struct tmio_mmc_host *host, u32 i) { … } EXPORT_SYMBOL_GPL(…); void tmio_mmc_disable_mmc_irqs(struct tmio_mmc_host *host, u32 i) { … } EXPORT_SYMBOL_GPL(…); static void tmio_mmc_ack_mmc_irqs(struct tmio_mmc_host *host, u32 i) { … } static void tmio_mmc_init_sg(struct tmio_mmc_host *host, struct mmc_data *data) { … } static int tmio_mmc_next_sg(struct tmio_mmc_host *host) { … } #define CMDREQ_TIMEOUT … static void tmio_mmc_enable_sdio_irq(struct mmc_host *mmc, int enable) { … } static void tmio_mmc_set_bus_width(struct tmio_mmc_host *host, unsigned char bus_width) { … } static void tmio_mmc_reset(struct tmio_mmc_host *host, bool preserve) { … } static void tmio_mmc_reset_work(struct work_struct *work) { … } /* These are the bitmasks the tmio chip requires to implement the MMC response * types. Note that R1 and R6 are the same in this scheme. */ #define APP_CMD … #define RESP_NONE … #define RESP_R1 … #define RESP_R1B … #define RESP_R2 … #define RESP_R3 … #define DATA_PRESENT … #define TRANSFER_READ … #define TRANSFER_MULTI … #define SECURITY_CMD … #define NO_CMD12_ISSUE … static int tmio_mmc_start_command(struct tmio_mmc_host *host, struct mmc_command *cmd) { … } static void tmio_mmc_transfer_data(struct tmio_mmc_host *host, unsigned short *buf, unsigned int count) { … } /* * This chip always returns (at least?) as much data as you ask for. * I'm unsure what happens if you ask for less than a block. This should be * looked into to ensure that a funny length read doesn't hose the controller. */ static void tmio_mmc_pio_irq(struct tmio_mmc_host *host) { … } static void tmio_mmc_check_bounce_buffer(struct tmio_mmc_host *host) { … } /* needs to be called with host->lock held */ void tmio_mmc_do_data_irq(struct tmio_mmc_host *host) { … } EXPORT_SYMBOL_GPL(…); static void tmio_mmc_data_irq(struct tmio_mmc_host *host, unsigned int stat) { … } static void tmio_mmc_cmd_irq(struct tmio_mmc_host *host, unsigned int stat) { … } static bool __tmio_mmc_card_detect_irq(struct tmio_mmc_host *host, int ireg, int status) { … } static bool __tmio_mmc_sdcard_irq(struct tmio_mmc_host *host, int ireg, int status) { … } static bool __tmio_mmc_sdio_irq(struct tmio_mmc_host *host) { … } irqreturn_t tmio_mmc_irq(int irq, void *devid) { … } EXPORT_SYMBOL_GPL(…); static int tmio_mmc_start_data(struct tmio_mmc_host *host, struct mmc_data *data) { … } static void tmio_process_mrq(struct tmio_mmc_host *host, struct mmc_request *mrq) { … } /* Process requests from the MMC layer */ static void tmio_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq) { … } static void tmio_mmc_finish_request(struct tmio_mmc_host *host) { … } static void tmio_mmc_done_work(struct work_struct *work) { … } static void tmio_mmc_power_on(struct tmio_mmc_host *host, unsigned short vdd) { … } static void tmio_mmc_power_off(struct tmio_mmc_host *host) { … } static unsigned int tmio_mmc_get_timeout_cycles(struct tmio_mmc_host *host) { … } static void tmio_mmc_max_busy_timeout(struct tmio_mmc_host *host) { … } /* Set MMC clock / power. * Note: This controller uses a simple divider scheme therefore it cannot * run a MMC card at full speed (20MHz). The max clock is 24MHz on SD, but as * MMC wont run that fast, it has to be clocked at 12MHz which is the next * slowest setting. */ static void tmio_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) { … } static int tmio_mmc_get_ro(struct mmc_host *mmc) { … } static int tmio_mmc_get_cd(struct mmc_host *mmc) { … } static int tmio_multi_io_quirk(struct mmc_card *card, unsigned int direction, int blk_size) { … } static struct mmc_host_ops tmio_mmc_ops = …; static int tmio_mmc_init_ocr(struct tmio_mmc_host *host) { … } static void tmio_mmc_of_parse(struct platform_device *pdev, struct mmc_host *mmc) { … } struct tmio_mmc_host *tmio_mmc_host_alloc(struct platform_device *pdev, struct tmio_mmc_data *pdata) { … } EXPORT_SYMBOL_GPL(…); void tmio_mmc_host_free(struct tmio_mmc_host *host) { … } EXPORT_SYMBOL_GPL(…); int tmio_mmc_host_probe(struct tmio_mmc_host *_host) { … } EXPORT_SYMBOL_GPL(…); void tmio_mmc_host_remove(struct tmio_mmc_host *host) { … } EXPORT_SYMBOL_GPL(…); #ifdef CONFIG_PM static int tmio_mmc_clk_enable(struct tmio_mmc_host *host) { … } static void tmio_mmc_clk_disable(struct tmio_mmc_host *host) { … } int tmio_mmc_host_runtime_suspend(struct device *dev) { … } EXPORT_SYMBOL_GPL(…); int tmio_mmc_host_runtime_resume(struct device *dev) { … } EXPORT_SYMBOL_GPL(…); #endif MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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