// SPDX-License-Identifier: GPL-2.0 /* * Copyright (C) 2013-2014 Renesas Electronics Europe Ltd. * Author: Guennadi Liakhovetski <[email protected]> */ #include <linux/clk.h> #include <linux/delay.h> #include <linux/device.h> #include <linux/dma-mapping.h> #include <linux/dmaengine.h> #include <linux/highmem.h> #include <linux/interrupt.h> #include <linux/io.h> #include <linux/log2.h> #include <linux/mmc/host.h> #include <linux/mmc/mmc.h> #include <linux/mmc/sd.h> #include <linux/mmc/sdio.h> #include <linux/module.h> #include <linux/pagemap.h> #include <linux/pinctrl/consumer.h> #include <linux/platform_device.h> #include <linux/scatterlist.h> #include <linux/string.h> #include <linux/time.h> #include <linux/virtio.h> #include <linux/workqueue.h> #define USDHI6_SD_CMD … #define USDHI6_SD_PORT_SEL … #define USDHI6_SD_ARG … #define USDHI6_SD_STOP … #define USDHI6_SD_SECCNT … #define USDHI6_SD_RSP10 … #define USDHI6_SD_RSP32 … #define USDHI6_SD_RSP54 … #define USDHI6_SD_RSP76 … #define USDHI6_SD_INFO1 … #define USDHI6_SD_INFO2 … #define USDHI6_SD_INFO1_MASK … #define USDHI6_SD_INFO2_MASK … #define USDHI6_SD_CLK_CTRL … #define USDHI6_SD_SIZE … #define USDHI6_SD_OPTION … #define USDHI6_SD_ERR_STS1 … #define USDHI6_SD_ERR_STS2 … #define USDHI6_SD_BUF0 … #define USDHI6_SDIO_MODE … #define USDHI6_SDIO_INFO1 … #define USDHI6_SDIO_INFO1_MASK … #define USDHI6_CC_EXT_MODE … #define USDHI6_SOFT_RST … #define USDHI6_VERSION … #define USDHI6_HOST_MODE … #define USDHI6_SDIF_MODE … #define USDHI6_SD_CMD_APP … #define USDHI6_SD_CMD_MODE_RSP_AUTO … #define USDHI6_SD_CMD_MODE_RSP_NONE … #define USDHI6_SD_CMD_MODE_RSP_R1 … #define USDHI6_SD_CMD_MODE_RSP_R1B … #define USDHI6_SD_CMD_MODE_RSP_R2 … #define USDHI6_SD_CMD_MODE_RSP_R3 … #define USDHI6_SD_CMD_DATA … #define USDHI6_SD_CMD_READ … #define USDHI6_SD_CMD_MULTI … #define USDHI6_SD_CMD_CMD12_AUTO_OFF … #define USDHI6_CC_EXT_MODE_SDRW … #define USDHI6_SD_INFO1_RSP_END … #define USDHI6_SD_INFO1_ACCESS_END … #define USDHI6_SD_INFO1_CARD_OUT … #define USDHI6_SD_INFO1_CARD_IN … #define USDHI6_SD_INFO1_CD … #define USDHI6_SD_INFO1_WP … #define USDHI6_SD_INFO1_D3_CARD_OUT … #define USDHI6_SD_INFO1_D3_CARD_IN … #define USDHI6_SD_INFO2_CMD_ERR … #define USDHI6_SD_INFO2_CRC_ERR … #define USDHI6_SD_INFO2_END_ERR … #define USDHI6_SD_INFO2_TOUT … #define USDHI6_SD_INFO2_IWA_ERR … #define USDHI6_SD_INFO2_IRA_ERR … #define USDHI6_SD_INFO2_RSP_TOUT … #define USDHI6_SD_INFO2_SDDAT0 … #define USDHI6_SD_INFO2_BRE … #define USDHI6_SD_INFO2_BWE … #define USDHI6_SD_INFO2_SCLKDIVEN … #define USDHI6_SD_INFO2_CBSY … #define USDHI6_SD_INFO2_ILA … #define USDHI6_SD_INFO1_CARD_INSERT … #define USDHI6_SD_INFO1_CARD_EJECT … #define USDHI6_SD_INFO1_CARD … #define USDHI6_SD_INFO1_CARD_CD … #define USDHI6_SD_INFO2_ERR … #define USDHI6_SD_INFO1_IRQ … #define USDHI6_SD_INFO2_IRQ … #define USDHI6_SD_CLK_CTRL_SCLKEN … #define USDHI6_SD_STOP_STP … #define USDHI6_SD_STOP_SEC … #define USDHI6_SDIO_INFO1_IOIRQ … #define USDHI6_SDIO_INFO1_EXPUB52 … #define USDHI6_SDIO_INFO1_EXWT … #define USDHI6_SD_ERR_STS1_CRC_NO_ERROR … #define USDHI6_SOFT_RST_RESERVED … #define USDHI6_SOFT_RST_RESET … #define USDHI6_SD_OPTION_TIMEOUT_SHIFT … #define USDHI6_SD_OPTION_TIMEOUT_MASK … #define USDHI6_SD_OPTION_WIDTH_1 … #define USDHI6_SD_PORT_SEL_PORTS_SHIFT … #define USDHI6_SD_CLK_CTRL_DIV_MASK … #define USDHI6_SDIO_INFO1_IRQ … #define USDHI6_MIN_DMA … #define USDHI6_REQ_TIMEOUT_MS … enum usdhi6_wait_for { … }; struct usdhi6_page { … }; struct usdhi6_host { … }; /* I/O primitives */ static void usdhi6_write(struct usdhi6_host *host, u32 reg, u32 data) { … } static void usdhi6_write16(struct usdhi6_host *host, u32 reg, u16 data) { … } static u32 usdhi6_read(struct usdhi6_host *host, u32 reg) { … } static u16 usdhi6_read16(struct usdhi6_host *host, u32 reg) { … } static void usdhi6_irq_enable(struct usdhi6_host *host, u32 info1, u32 info2) { … } static void usdhi6_wait_for_resp(struct usdhi6_host *host) { … } static void usdhi6_wait_for_brwe(struct usdhi6_host *host, bool read) { … } static void usdhi6_only_cd(struct usdhi6_host *host) { … } static void usdhi6_mask_all(struct usdhi6_host *host) { … } static int usdhi6_error_code(struct usdhi6_host *host) { … } /* Scatter-Gather management */ /* * In PIO mode we have to map each page separately, using kmap(). That way * adjacent pages are mapped to non-adjacent virtual addresses. That's why we * have to use a bounce buffer for blocks, crossing page boundaries. Such blocks * have been observed with an SDIO WiFi card (b43 driver). */ static void usdhi6_blk_bounce(struct usdhi6_host *host, struct scatterlist *sg) { … } /* Only called for multiple block IO */ static void usdhi6_sg_prep(struct usdhi6_host *host) { … } /* Map the first page in an SG segment: common for multiple and single block IO */ static void *usdhi6_sg_map(struct usdhi6_host *host) { … } /* Unmap the current page: common for multiple and single block IO */ static void usdhi6_sg_unmap(struct usdhi6_host *host, bool force) { … } /* Called from MMC_WRITE_MULTIPLE_BLOCK or MMC_READ_MULTIPLE_BLOCK */ static void usdhi6_sg_advance(struct usdhi6_host *host) { … } /* DMA handling */ static void usdhi6_dma_release(struct usdhi6_host *host) { … } static void usdhi6_dma_stop_unmap(struct usdhi6_host *host) { … } static void usdhi6_dma_complete(void *arg) { … } static int usdhi6_dma_setup(struct usdhi6_host *host, struct dma_chan *chan, enum dma_transfer_direction dir) { … } static int usdhi6_dma_start(struct usdhi6_host *host) { … } static void usdhi6_dma_kill(struct usdhi6_host *host) { … } static void usdhi6_dma_check_error(struct usdhi6_host *host) { … } static void usdhi6_dma_kick(struct usdhi6_host *host) { … } static void usdhi6_dma_request(struct usdhi6_host *host, phys_addr_t start) { … } /* API helpers */ static void usdhi6_clk_set(struct usdhi6_host *host, struct mmc_ios *ios) { … } static void usdhi6_set_power(struct usdhi6_host *host, struct mmc_ios *ios) { … } static int usdhi6_reset(struct usdhi6_host *host) { … } static void usdhi6_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) { … } /* This is data timeout. Response timeout is fixed to 640 clock cycles */ static void usdhi6_timeout_set(struct usdhi6_host *host) { … } static void usdhi6_request_done(struct usdhi6_host *host) { … } static int usdhi6_cmd_flags(struct usdhi6_host *host) { … } static int usdhi6_rq_start(struct usdhi6_host *host) { … } static void usdhi6_request(struct mmc_host *mmc, struct mmc_request *mrq) { … } static int usdhi6_get_cd(struct mmc_host *mmc) { … } static int usdhi6_get_ro(struct mmc_host *mmc) { … } static void usdhi6_enable_sdio_irq(struct mmc_host *mmc, int enable) { … } static int usdhi6_set_pinstates(struct usdhi6_host *host, int voltage) { … } static int usdhi6_sig_volt_switch(struct mmc_host *mmc, struct mmc_ios *ios) { … } static int usdhi6_card_busy(struct mmc_host *mmc) { … } static const struct mmc_host_ops usdhi6_ops = …; /* State machine handlers */ static void usdhi6_resp_cmd12(struct usdhi6_host *host) { … } static void usdhi6_resp_read(struct usdhi6_host *host) { … } static int usdhi6_blk_read(struct usdhi6_host *host) { … } static int usdhi6_blk_write(struct usdhi6_host *host) { … } static int usdhi6_stop_cmd(struct usdhi6_host *host) { … } static bool usdhi6_end_cmd(struct usdhi6_host *host) { … } static bool usdhi6_read_block(struct usdhi6_host *host) { … } static bool usdhi6_mread_block(struct usdhi6_host *host) { … } static bool usdhi6_write_block(struct usdhi6_host *host) { … } static bool usdhi6_mwrite_block(struct usdhi6_host *host) { … } /* Interrupt & timeout handlers */ static irqreturn_t usdhi6_sd_bh(int irq, void *dev_id) { … } static irqreturn_t usdhi6_sd(int irq, void *dev_id) { … } static irqreturn_t usdhi6_sdio(int irq, void *dev_id) { … } static irqreturn_t usdhi6_cd(int irq, void *dev_id) { … } /* * Actually this should not be needed, if the built-in timeout works reliably in * the both PIO cases and DMA never fails. But if DMA does fail, a timeout * handler might be the only way to catch the error. */ static void usdhi6_timeout_work(struct work_struct *work) { … } /* Probe / release */ static const struct of_device_id usdhi6_of_match[] = …; MODULE_DEVICE_TABLE(of, usdhi6_of_match); static int usdhi6_probe(struct platform_device *pdev) { … } static void usdhi6_remove(struct platform_device *pdev) { … } static struct platform_driver usdhi6_driver = …; module_platform_driver(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …; MODULE_ALIAS(…) …; MODULE_AUTHOR(…) …;
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