--- /dev/null
+/*
+ * linux/drivers/mmc/host/mxcmmc.c - Freescale i.MX MMCI driver
+ *
+ * This is a driver for the SDHC controller found in Freescale MX2/MX3
+ * SoCs. It is basically the same hardware as found on MX1 (imxmmc.c).
+ * Unlike the hardware found on MX1, this hardware just works and does
+ * not need all the quirks found in imxmmc.c, hence the seperate driver.
+ *
+ * Copyright (C) 2008 Sascha Hauer, Pengutronix <s.hauer@pengutronix.de>
+ * Copyright (C) 2006 Pavel Pisa, PiKRON <ppisa@pikron.com>
+ *
+ * derived from pxamci.c by Russell King
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <linux/platform_device.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/blkdev.h>
+#include <linux/dma-mapping.h>
+#include <linux/mmc/host.h>
+#include <linux/mmc/card.h>
+#include <linux/delay.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/gpio.h>
+
+#include <asm/dma.h>
+#include <asm/irq.h>
+#include <asm/sizes.h>
+#include <mach/mmc.h>
+
+#ifdef CONFIG_ARCH_MX2
+#include <mach/dma-mx1-mx2.h>
+#define HAS_DMA
+#endif
+
+#define DRIVER_NAME "imx-mmc"
+
+#define MMC_REG_STR_STP_CLK 0x00
+#define MMC_REG_STATUS 0x04
+#define MMC_REG_CLK_RATE 0x08
+#define MMC_REG_CMD_DAT_CONT 0x0C
+#define MMC_REG_RES_TO 0x10
+#define MMC_REG_READ_TO 0x14
+#define MMC_REG_BLK_LEN 0x18
+#define MMC_REG_NOB 0x1C
+#define MMC_REG_REV_NO 0x20
+#define MMC_REG_INT_CNTR 0x24
+#define MMC_REG_CMD 0x28
+#define MMC_REG_ARG 0x2C
+#define MMC_REG_RES_FIFO 0x34
+#define MMC_REG_BUFFER_ACCESS 0x38
+
+#define STR_STP_CLK_RESET (1 << 3)
+#define STR_STP_CLK_START_CLK (1 << 1)
+#define STR_STP_CLK_STOP_CLK (1 << 0)
+
+#define STATUS_CARD_INSERTION (1 << 31)
+#define STATUS_CARD_REMOVAL (1 << 30)
+#define STATUS_YBUF_EMPTY (1 << 29)
+#define STATUS_XBUF_EMPTY (1 << 28)
+#define STATUS_YBUF_FULL (1 << 27)
+#define STATUS_XBUF_FULL (1 << 26)
+#define STATUS_BUF_UND_RUN (1 << 25)
+#define STATUS_BUF_OVFL (1 << 24)
+#define STATUS_SDIO_INT_ACTIVE (1 << 14)
+#define STATUS_END_CMD_RESP (1 << 13)
+#define STATUS_WRITE_OP_DONE (1 << 12)
+#define STATUS_DATA_TRANS_DONE (1 << 11)
+#define STATUS_READ_OP_DONE (1 << 11)
+#define STATUS_WR_CRC_ERROR_CODE_MASK (3 << 10)
+#define STATUS_CARD_BUS_CLK_RUN (1 << 8)
+#define STATUS_BUF_READ_RDY (1 << 7)
+#define STATUS_BUF_WRITE_RDY (1 << 6)
+#define STATUS_RESP_CRC_ERR (1 << 5)
+#define STATUS_CRC_READ_ERR (1 << 3)
+#define STATUS_CRC_WRITE_ERR (1 << 2)
+#define STATUS_TIME_OUT_RESP (1 << 1)
+#define STATUS_TIME_OUT_READ (1 << 0)
+#define STATUS_ERR_MASK 0x2f
+
+#define CMD_DAT_CONT_CMD_RESP_LONG_OFF (1 << 12)
+#define CMD_DAT_CONT_STOP_READWAIT (1 << 11)
+#define CMD_DAT_CONT_START_READWAIT (1 << 10)
+#define CMD_DAT_CONT_BUS_WIDTH_4 (2 << 8)
+#define CMD_DAT_CONT_INIT (1 << 7)
+#define CMD_DAT_CONT_WRITE (1 << 4)
+#define CMD_DAT_CONT_DATA_ENABLE (1 << 3)
+#define CMD_DAT_CONT_RESPONSE_48BIT_CRC (1 << 0)
+#define CMD_DAT_CONT_RESPONSE_136BIT (2 << 0)
+#define CMD_DAT_CONT_RESPONSE_48BIT (3 << 0)
+
+#define INT_SDIO_INT_WKP_EN (1 << 18)
+#define INT_CARD_INSERTION_WKP_EN (1 << 17)
+#define INT_CARD_REMOVAL_WKP_EN (1 << 16)
+#define INT_CARD_INSERTION_EN (1 << 15)
+#define INT_CARD_REMOVAL_EN (1 << 14)
+#define INT_SDIO_IRQ_EN (1 << 13)
+#define INT_DAT0_EN (1 << 12)
+#define INT_BUF_READ_EN (1 << 4)
+#define INT_BUF_WRITE_EN (1 << 3)
+#define INT_END_CMD_RES_EN (1 << 2)
+#define INT_WRITE_OP_DONE_EN (1 << 1)
+#define INT_READ_OP_EN (1 << 0)
+
+struct mxcmci_host {
+ struct mmc_host *mmc;
+ struct resource *res;
+ void __iomem *base;
+ int irq;
+ int detect_irq;
+ int dma;
+ int do_dma;
+ unsigned int power_mode;
+ struct imxmmc_platform_data *pdata;
+
+ struct mmc_request *req;
+ struct mmc_command *cmd;
+ struct mmc_data *data;
+
+ unsigned int dma_nents;
+ unsigned int datasize;
+ unsigned int dma_dir;
+
+ u16 rev_no;
+ unsigned int cmdat;
+
+ struct clk *clk;
+
+ int clock;
+
+ struct work_struct datawork;
+};
+
+static inline int mxcmci_use_dma(struct mxcmci_host *host)
+{
+ return host->do_dma;
+}
+
+static void mxcmci_softreset(struct mxcmci_host *host)
+{
+ int i;
+
+ /* reset sequence */
+ writew(STR_STP_CLK_RESET, host->base + MMC_REG_STR_STP_CLK);
+ writew(STR_STP_CLK_RESET | STR_STP_CLK_START_CLK,
+ host->base + MMC_REG_STR_STP_CLK);
+
+ for (i = 0; i < 8; i++)
+ writew(STR_STP_CLK_START_CLK, host->base + MMC_REG_STR_STP_CLK);
+
+ writew(0xff, host->base + MMC_REG_RES_TO);
+}
+
+static void mxcmci_setup_data(struct mxcmci_host *host, struct mmc_data *data)
+{
+ unsigned int nob = data->blocks;
+ unsigned int blksz = data->blksz;
+ unsigned int datasize = nob * blksz;
+#ifdef HAS_DMA
+ struct scatterlist *sg;
+ int i;
+#endif
+ if (data->flags & MMC_DATA_STREAM)
+ nob = 0xffff;
+
+ host->data = data;
+ data->bytes_xfered = 0;
+
+ writew(nob, host->base + MMC_REG_NOB);
+ writew(blksz, host->base + MMC_REG_BLK_LEN);
+ host->datasize = datasize;
+
+#ifdef HAS_DMA
+ for_each_sg(data->sg, sg, data->sg_len, i) {
+ if (sg->offset & 3 || sg->length & 3) {
+ host->do_dma = 0;
+ return;
+ }
+ }
+
+ if (data->flags & MMC_DATA_READ) {
+ host->dma_dir = DMA_FROM_DEVICE;
+ host->dma_nents = dma_map_sg(mmc_dev(host->mmc), data->sg,
+ data->sg_len, host->dma_dir);
+
+ imx_dma_setup_sg(host->dma, data->sg, host->dma_nents, datasize,
+ host->res->start + MMC_REG_BUFFER_ACCESS,
+ DMA_MODE_READ);
+ } else {
+ host->dma_dir = DMA_TO_DEVICE;
+ host->dma_nents = dma_map_sg(mmc_dev(host->mmc), data->sg,
+ data->sg_len, host->dma_dir);
+
+ imx_dma_setup_sg(host->dma, data->sg, host->dma_nents, datasize,
+ host->res->start + MMC_REG_BUFFER_ACCESS,
+ DMA_MODE_WRITE);
+ }
+
+ wmb();
+
+ imx_dma_enable(host->dma);
+#endif /* HAS_DMA */
+}
+
+static int mxcmci_start_cmd(struct mxcmci_host *host, struct mmc_command *cmd,
+ unsigned int cmdat)
+{
+ WARN_ON(host->cmd != NULL);
+ host->cmd = cmd;
+
+ switch (mmc_resp_type(cmd)) {
+ case MMC_RSP_R1: /* short CRC, OPCODE */
+ case MMC_RSP_R1B:/* short CRC, OPCODE, BUSY */
+ cmdat |= CMD_DAT_CONT_RESPONSE_48BIT_CRC;
+ break;
+ case MMC_RSP_R2: /* long 136 bit + CRC */
+ cmdat |= CMD_DAT_CONT_RESPONSE_136BIT;
+ break;
+ case MMC_RSP_R3: /* short */
+ cmdat |= CMD_DAT_CONT_RESPONSE_48BIT;
+ break;
+ case MMC_RSP_NONE:
+ break;
+ default:
+ dev_err(mmc_dev(host->mmc), "unhandled response type 0x%x\n",
+ mmc_resp_type(cmd));
+ cmd->error = -EINVAL;
+ return -EINVAL;
+ }
+
+ if (mxcmci_use_dma(host))
+ writel(INT_READ_OP_EN | INT_WRITE_OP_DONE_EN |
+ INT_END_CMD_RES_EN,
+ host->base + MMC_REG_INT_CNTR);
+ else
+ writel(INT_END_CMD_RES_EN, host->base + MMC_REG_INT_CNTR);
+
+ writew(cmd->opcode, host->base + MMC_REG_CMD);
+ writel(cmd->arg, host->base + MMC_REG_ARG);
+ writew(cmdat, host->base + MMC_REG_CMD_DAT_CONT);
+
+ return 0;
+}
+
+static void mxcmci_finish_request(struct mxcmci_host *host,
+ struct mmc_request *req)
+{
+ writel(0, host->base + MMC_REG_INT_CNTR);
+
+ host->req = NULL;
+ host->cmd = NULL;
+ host->data = NULL;
+
+ mmc_request_done(host->mmc, req);
+}
+
+static int mxcmci_finish_data(struct mxcmci_host *host, unsigned int stat)
+{
+ struct mmc_data *data = host->data;
+ int data_error;
+
+#ifdef HAS_DMA
+ if (mxcmci_use_dma(host)) {
+ imx_dma_disable(host->dma);
+ dma_unmap_sg(mmc_dev(host->mmc), data->sg, host->dma_nents,
+ host->dma_dir);
+ }
+#endif
+
+ if (stat & STATUS_ERR_MASK) {
+ dev_dbg(mmc_dev(host->mmc), "request failed. status: 0x%08x\n",
+ stat);
+ if (stat & STATUS_CRC_READ_ERR) {
+ data->error = -EILSEQ;
+ } else if (stat & STATUS_CRC_WRITE_ERR) {
+ u32 err_code = (stat >> 9) & 0x3;
+ if (err_code == 2) /* No CRC response */
+ data->error = -ETIMEDOUT;
+ else
+ data->error = -EILSEQ;
+ } else if (stat & STATUS_TIME_OUT_READ) {
+ data->error = -ETIMEDOUT;
+ } else {
+ data->error = -EIO;
+ }
+ } else {
+ data->bytes_xfered = host->datasize;
+ }
+
+ data_error = data->error;
+
+ host->data = NULL;
+
+ return data_error;
+}
+
+static void mxcmci_read_response(struct mxcmci_host *host, unsigned int stat)
+{
+ struct mmc_command *cmd = host->cmd;
+ int i;
+ u32 a, b, c;
+
+ if (!cmd)
+ return;
+
+ if (stat & STATUS_TIME_OUT_RESP) {
+ dev_dbg(mmc_dev(host->mmc), "CMD TIMEOUT\n");
+ cmd->error = -ETIMEDOUT;
+ } else if (stat & STATUS_RESP_CRC_ERR && cmd->flags & MMC_RSP_CRC) {
+ dev_dbg(mmc_dev(host->mmc), "cmd crc error\n");
+ cmd->error = -EILSEQ;
+ }
+
+ if (cmd->flags & MMC_RSP_PRESENT) {
+ if (cmd->flags & MMC_RSP_136) {
+ for (i = 0; i < 4; i++) {
+ a = readw(host->base + MMC_REG_RES_FIFO);
+ b = readw(host->base + MMC_REG_RES_FIFO);
+ cmd->resp[i] = a << 16 | b;
+ }
+ } else {
+ a = readw(host->base + MMC_REG_RES_FIFO);
+ b = readw(host->base + MMC_REG_RES_FIFO);
+ c = readw(host->base + MMC_REG_RES_FIFO);
+ cmd->resp[0] = a << 24 | b << 8 | c >> 8;
+ }
+ }
+}
+
+static int mxcmci_poll_status(struct mxcmci_host *host, u32 mask)
+{
+ u32 stat;
+ unsigned long timeout = jiffies + HZ;
+
+ do {
+ stat = readl(host->base + MMC_REG_STATUS);
+ if (stat & STATUS_ERR_MASK)
+ return stat;
+ if (time_after(jiffies, timeout))
+ return STATUS_TIME_OUT_READ;
+ if (stat & mask)
+ return 0;
+ cpu_relax();
+ } while (1);
+}
+
+static int mxcmci_pull(struct mxcmci_host *host, void *_buf, int bytes)
+{
+ unsigned int stat;
+ u32 *buf = _buf;
+
+ while (bytes > 3) {
+ stat = mxcmci_poll_status(host,
+ STATUS_BUF_READ_RDY | STATUS_READ_OP_DONE);
+ if (stat)
+ return stat;
+ *buf++ = readl(host->base + MMC_REG_BUFFER_ACCESS);
+ bytes -= 4;
+ }
+
+ if (bytes) {
+ u8 *b = (u8 *)buf;
+ u32 tmp;
+
+ stat = mxcmci_poll_status(host,
+ STATUS_BUF_READ_RDY | STATUS_READ_OP_DONE);
+ if (stat)
+ return stat;
+ tmp = readl(host->base + MMC_REG_BUFFER_ACCESS);
+ memcpy(b, &tmp, bytes);
+ }
+
+ return 0;
+}
+
+static int mxcmci_push(struct mxcmci_host *host, void *_buf, int bytes)
+{
+ unsigned int stat;
+ u32 *buf = _buf;
+
+ while (bytes > 3) {
+ stat = mxcmci_poll_status(host, STATUS_BUF_WRITE_RDY);
+ if (stat)
+ return stat;
+ writel(*buf++, host->base + MMC_REG_BUFFER_ACCESS);
+ bytes -= 4;
+ }
+
+ if (bytes) {
+ u8 *b = (u8 *)buf;
+ u32 tmp;
+
+ stat = mxcmci_poll_status(host, STATUS_BUF_WRITE_RDY);
+ if (stat)
+ return stat;
+
+ memcpy(&tmp, b, bytes);
+ writel(tmp, host->base + MMC_REG_BUFFER_ACCESS);
+ }
+
+ stat = mxcmci_poll_status(host, STATUS_BUF_WRITE_RDY);
+ if (stat)
+ return stat;
+
+ return 0;
+}
+
+static int mxcmci_transfer_data(struct mxcmci_host *host)
+{
+ struct mmc_data *data = host->req->data;
+ struct scatterlist *sg;
+ int stat, i;
+
+ host->datasize = 0;
+
+ host->data = data;
+ host->datasize = 0;
+
+ if (data->flags & MMC_DATA_READ) {
+ for_each_sg(data->sg, sg, data->sg_len, i) {
+ stat = mxcmci_pull(host, sg_virt(sg), sg->length);
+ if (stat)
+ return stat;
+ host->datasize += sg->length;
+ }
+ } else {
+ for_each_sg(data->sg, sg, data->sg_len, i) {
+ stat = mxcmci_push(host, sg_virt(sg), sg->length);
+ if (stat)
+ return stat;
+ host->datasize += sg->length;
+ }
+ stat = mxcmci_poll_status(host, STATUS_WRITE_OP_DONE);
+ if (stat)
+ return stat;
+ }
+ return 0;
+}
+
+static void mxcmci_datawork(struct work_struct *work)
+{
+ struct mxcmci_host *host = container_of(work, struct mxcmci_host,
+ datawork);
+ int datastat = mxcmci_transfer_data(host);
+ mxcmci_finish_data(host, datastat);
+
+ if (host->req->stop) {
+ if (mxcmci_start_cmd(host, host->req->stop, 0)) {
+ mxcmci_finish_request(host, host->req);
+ return;
+ }
+ } else {
+ mxcmci_finish_request(host, host->req);
+ }
+}
+
+#ifdef HAS_DMA
+static void mxcmci_data_done(struct mxcmci_host *host, unsigned int stat)
+{
+ struct mmc_data *data = host->data;
+ int data_error;
+
+ if (!data)
+ return;
+
+ data_error = mxcmci_finish_data(host, stat);
+
+ mxcmci_read_response(host, stat);
+ host->cmd = NULL;
+
+ if (host->req->stop) {
+ if (mxcmci_start_cmd(host, host->req->stop, 0)) {
+ mxcmci_finish_request(host, host->req);
+ return;
+ }
+ } else {
+ mxcmci_finish_request(host, host->req);
+ }
+}
+#endif /* HAS_DMA */
+
+static void mxcmci_cmd_done(struct mxcmci_host *host, unsigned int stat)
+{
+ mxcmci_read_response(host, stat);
+ host->cmd = NULL;
+
+ if (!host->data && host->req) {
+ mxcmci_finish_request(host, host->req);
+ return;
+ }
+
+ /* For the DMA case the DMA engine handles the data transfer
+ * automatically. For non DMA we have to to it ourselves.
+ * Don't do it in interrupt context though.
+ */
+ if (!mxcmci_use_dma(host) && host->data)
+ schedule_work(&host->datawork);
+
+}
+
+static irqreturn_t mxcmci_irq(int irq, void *devid)
+{
+ struct mxcmci_host *host = devid;
+ u32 stat;
+
+ stat = readl(host->base + MMC_REG_STATUS);
+ writel(stat, host->base + MMC_REG_STATUS);
+
+ dev_dbg(mmc_dev(host->mmc), "%s: 0x%08x\n", __func__, stat);
+
+ if (stat & STATUS_END_CMD_RESP)
+ mxcmci_cmd_done(host, stat);
+#ifdef HAS_DMA
+ if (mxcmci_use_dma(host) &&
+ (stat & (STATUS_DATA_TRANS_DONE | STATUS_WRITE_OP_DONE)))
+ mxcmci_data_done(host, stat);
+#endif
+ return IRQ_HANDLED;
+}
+
+static void mxcmci_request(struct mmc_host *mmc, struct mmc_request *req)
+{
+ struct mxcmci_host *host = mmc_priv(mmc);
+ unsigned int cmdat = host->cmdat;
+
+ WARN_ON(host->req != NULL);
+
+ host->req = req;
+ host->cmdat &= ~CMD_DAT_CONT_INIT;
+#ifdef HAS_DMA
+ host->do_dma = 1;
+#endif
+ if (req->data) {
+ mxcmci_setup_data(host, req->data);
+
+ cmdat |= CMD_DAT_CONT_DATA_ENABLE;
+
+ if (req->data->flags & MMC_DATA_WRITE)
+ cmdat |= CMD_DAT_CONT_WRITE;
+ }
+
+ if (mxcmci_start_cmd(host, req->cmd, cmdat))
+ mxcmci_finish_request(host, req);
+}
+
+static void mxcmci_set_clk_rate(struct mxcmci_host *host, unsigned int clk_ios)
+{
+ unsigned int divider;
+ int prescaler = 0;
+ unsigned int clk_in = clk_get_rate(host->clk);
+
+ while (prescaler <= 0x800) {
+ for (divider = 1; divider <= 0xF; divider++) {
+ int x;
+
+ x = (clk_in / (divider + 1));
+
+ if (prescaler)
+ x /= (prescaler * 2);
+
+ if (x <= clk_ios)
+ break;
+ }
+ if (divider < 0x10)
+ break;
+
+ if (prescaler == 0)
+ prescaler = 1;
+ else
+ prescaler <<= 1;
+ }
+
+ writew((prescaler << 4) | divider, host->base + MMC_REG_CLK_RATE);
+
+ dev_dbg(mmc_dev(host->mmc), "scaler: %d divider: %d in: %d out: %d\n",
+ prescaler, divider, clk_in, clk_ios);
+}
+
+static void mxcmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
+{
+ struct mxcmci_host *host = mmc_priv(mmc);
+#ifdef HAS_DMA
+ unsigned int blen;
+ /*
+ * use burstlen of 64 in 4 bit mode (--> reg value 0)
+ * use burstlen of 16 in 1 bit mode (--> reg value 16)
+ */
+ if (ios->bus_width == MMC_BUS_WIDTH_4)
+ blen = 0;
+ else
+ blen = 16;
+
+ imx_dma_config_burstlen(host->dma, blen);
+#endif
+ if (ios->bus_width == MMC_BUS_WIDTH_4)
+ host->cmdat |= CMD_DAT_CONT_BUS_WIDTH_4;
+ else
+ host->cmdat &= ~CMD_DAT_CONT_BUS_WIDTH_4;
+
+ if (host->power_mode != ios->power_mode) {
+ if (host->pdata && host->pdata->setpower)
+ host->pdata->setpower(mmc_dev(mmc), ios->vdd);
+ host->power_mode = ios->power_mode;
+ if (ios->power_mode == MMC_POWER_ON)
+ host->cmdat |= CMD_DAT_CONT_INIT;
+ }
+
+ if (ios->clock) {
+ mxcmci_set_clk_rate(host, ios->clock);
+ writew(STR_STP_CLK_START_CLK, host->base + MMC_REG_STR_STP_CLK);
+ } else {
+ writew(STR_STP_CLK_STOP_CLK, host->base + MMC_REG_STR_STP_CLK);
+ }
+
+ host->clock = ios->clock;
+}
+
+static irqreturn_t mxcmci_detect_irq(int irq, void *data)
+{
+ struct mmc_host *mmc = data;
+
+ dev_dbg(mmc_dev(mmc), "%s\n", __func__);
+
+ mmc_detect_change(mmc, msecs_to_jiffies(250));
+ return IRQ_HANDLED;
+}
+
+static int mxcmci_get_ro(struct mmc_host *mmc)
+{
+ struct mxcmci_host *host = mmc_priv(mmc);
+
+ if (host->pdata && host->pdata->get_ro)
+ return !!host->pdata->get_ro(mmc_dev(mmc));
+ /*
+ * Board doesn't support read only detection; let the mmc core
+ * decide what to do.
+ */
+ return -ENOSYS;
+}
+
+
+static const struct mmc_host_ops mxcmci_ops = {
+ .request = mxcmci_request,
+ .set_ios = mxcmci_set_ios,
+ .get_ro = mxcmci_get_ro,
+};
+
+static int mxcmci_probe(struct platform_device *pdev)
+{
+ struct mmc_host *mmc;
+ struct mxcmci_host *host = NULL;
+ struct resource *r;
+ int ret = 0, irq;
+
+ printk(KERN_INFO "i.MX SDHC driver\n");
+
+ r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ irq = platform_get_irq(pdev, 0);
+ if (!r || irq < 0)
+ return -EINVAL;
+
+ r = request_mem_region(r->start, resource_size(r), pdev->name);
+ if (!r)
+ return -EBUSY;
+
+ mmc = mmc_alloc_host(sizeof(struct mxcmci_host), &pdev->dev);
+ if (!mmc) {
+ ret = -ENOMEM;
+ goto out_release_mem;
+ }
+
+ mmc->ops = &mxcmci_ops;
+ mmc->caps = MMC_CAP_4_BIT_DATA;
+
+ /* MMC core transfer sizes tunable parameters */
+ mmc->max_hw_segs = 64;
+ mmc->max_phys_segs = 64;
+ mmc->max_blk_size = 2048;
+ mmc->max_blk_count = 65535;
+ mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
+ mmc->max_seg_size = mmc->max_seg_size;
+
+ host = mmc_priv(mmc);
+ host->base = ioremap(r->start, resource_size(r));
+ if (!host->base) {
+ ret = -ENOMEM;
+ goto out_free;
+ }
+
+ host->mmc = mmc;
+ host->pdata = pdev->dev.platform_data;
+
+ if (host->pdata && host->pdata->ocr_avail)
+ mmc->ocr_avail = host->pdata->ocr_avail;
+ else
+ mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
+
+ host->res = r;
+ host->irq = irq;
+
+ host->clk = clk_get(&pdev->dev, "sdhc_clk");
+ if (IS_ERR(host->clk)) {
+ ret = PTR_ERR(host->clk);
+ goto out_iounmap;
+ }
+ clk_enable(host->clk);
+
+ mxcmci_softreset(host);
+
+ host->rev_no = readw(host->base + MMC_REG_REV_NO);
+ if (host->rev_no != 0x400) {
+ ret = -ENODEV;
+ dev_err(mmc_dev(host->mmc), "wrong rev.no. 0x%08x. aborting.\n",
+ host->rev_no);
+ goto out_clk_put;
+ }
+
+ mmc->f_min = clk_get_rate(host->clk) >> 7;
+ mmc->f_max = clk_get_rate(host->clk) >> 1;
+
+ /* recommended in data sheet */
+ writew(0x2db4, host->base + MMC_REG_READ_TO);
+
+ writel(0, host->base + MMC_REG_INT_CNTR);
+
+#ifdef HAS_DMA
+ host->dma = imx_dma_request_by_prio(DRIVER_NAME, DMA_PRIO_LOW);
+ if (host->dma < 0) {
+ dev_err(mmc_dev(host->mmc), "imx_dma_request_by_prio failed\n");
+ ret = -EBUSY;
+ goto out_clk_put;
+ }
+
+ r = platform_get_resource(pdev, IORESOURCE_DMA, 0);
+ if (!r) {
+ ret = -EINVAL;
+ goto out_free_dma;
+ }
+
+ ret = imx_dma_config_channel(host->dma,
+ IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_FIFO,
+ IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR,
+ r->start, 0);
+ if (ret) {
+ dev_err(mmc_dev(host->mmc), "failed to config DMA channel\n");
+ goto out_free_dma;
+ }
+#endif
+ INIT_WORK(&host->datawork, mxcmci_datawork);
+
+ ret = request_irq(host->irq, mxcmci_irq, 0, DRIVER_NAME, host);
+ if (ret)
+ goto out_free_dma;
+
+ platform_set_drvdata(pdev, mmc);
+
+ if (host->pdata && host->pdata->init) {
+ ret = host->pdata->init(&pdev->dev, mxcmci_detect_irq,
+ host->mmc);
+ if (ret)
+ goto out_free_irq;
+ }
+
+ mmc_add_host(mmc);
+
+ return 0;
+
+out_free_irq:
+ free_irq(host->irq, host);
+out_free_dma:
+#ifdef HAS_DMA
+ imx_dma_free(host->dma);
+#endif
+out_clk_put:
+ clk_disable(host->clk);
+ clk_put(host->clk);
+out_iounmap:
+ iounmap(host->base);
+out_free:
+ mmc_free_host(mmc);
+out_release_mem:
+ release_mem_region(host->res->start, resource_size(host->res));
+ return ret;
+}
+
+static int mxcmci_remove(struct platform_device *pdev)
+{
+ struct mmc_host *mmc = platform_get_drvdata(pdev);
+ struct mxcmci_host *host = mmc_priv(mmc);
+
+ platform_set_drvdata(pdev, NULL);
+
+ mmc_remove_host(mmc);
+
+ if (host->pdata && host->pdata->exit)
+ host->pdata->exit(&pdev->dev, mmc);
+
+ free_irq(host->irq, host);
+ iounmap(host->base);
+#ifdef HAS_DMA
+ imx_dma_free(host->dma);
+#endif
+ clk_disable(host->clk);
+ clk_put(host->clk);
+
+ release_mem_region(host->res->start, resource_size(host->res));
+ release_resource(host->res);
+
+ mmc_free_host(mmc);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM
+static int mxcmci_suspend(struct platform_device *dev, pm_message_t state)
+{
+ struct mmc_host *mmc = platform_get_drvdata(dev);
+ int ret = 0;
+
+ if (mmc)
+ ret = mmc_suspend_host(mmc, state);
+
+ return ret;
+}
+
+static int mxcmci_resume(struct platform_device *dev)
+{
+ struct mmc_host *mmc = platform_get_drvdata(dev);
+ struct mxcmci_host *host;
+ int ret = 0;
+
+ if (mmc) {
+ host = mmc_priv(mmc);
+ ret = mmc_resume_host(mmc);
+ }
+
+ return ret;
+}
+#else
+#define mxcmci_suspend NULL
+#define mxcmci_resume NULL
+#endif /* CONFIG_PM */
+
+static struct platform_driver mxcmci_driver = {
+ .probe = mxcmci_probe,
+ .remove = mxcmci_remove,
+ .suspend = mxcmci_suspend,
+ .resume = mxcmci_resume,
+ .driver = {
+ .name = DRIVER_NAME,
+ .owner = THIS_MODULE,
+ }
+};
+
+static int __init mxcmci_init(void)
+{
+ return platform_driver_register(&mxcmci_driver);
+}
+
+static void __exit mxcmci_exit(void)
+{
+ platform_driver_unregister(&mxcmci_driver);
+}
+
+module_init(mxcmci_init);
+module_exit(mxcmci_exit);
+
+MODULE_DESCRIPTION("i.MX Multimedia Card Interface Driver");
+MODULE_AUTHOR("Sascha Hauer, Pengutronix");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:imx-mmc");
projects / GitHub / moto-9609 / android_kernel_motorola_exynos9610.git / commitdiff