--- /dev/null
+/*
+ * Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de>
+ * JZ4740 SD/MMC controller driver
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#include <linux/mmc/host.h>
+#include <linux/mmc/slot-gpio.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/delay.h>
+#include <linux/scatterlist.h>
+#include <linux/clk.h>
+
+#include <linux/bitops.h>
+#include <linux/gpio.h>
+#include <asm/mach-jz4740/gpio.h>
+#include <asm/cacheflush.h>
+#include <linux/dma-mapping.h>
+#include <linux/dmaengine.h>
+
+#include <asm/mach-jz4740/dma.h>
+#include <asm/mach-jz4740/jz4740_mmc.h>
+
+#define JZ_REG_MMC_STRPCL 0x00
+#define JZ_REG_MMC_STATUS 0x04
+#define JZ_REG_MMC_CLKRT 0x08
+#define JZ_REG_MMC_CMDAT 0x0C
+#define JZ_REG_MMC_RESTO 0x10
+#define JZ_REG_MMC_RDTO 0x14
+#define JZ_REG_MMC_BLKLEN 0x18
+#define JZ_REG_MMC_NOB 0x1C
+#define JZ_REG_MMC_SNOB 0x20
+#define JZ_REG_MMC_IMASK 0x24
+#define JZ_REG_MMC_IREG 0x28
+#define JZ_REG_MMC_CMD 0x2C
+#define JZ_REG_MMC_ARG 0x30
+#define JZ_REG_MMC_RESP_FIFO 0x34
+#define JZ_REG_MMC_RXFIFO 0x38
+#define JZ_REG_MMC_TXFIFO 0x3C
+
+#define JZ_MMC_STRPCL_EXIT_MULTIPLE BIT(7)
+#define JZ_MMC_STRPCL_EXIT_TRANSFER BIT(6)
+#define JZ_MMC_STRPCL_START_READWAIT BIT(5)
+#define JZ_MMC_STRPCL_STOP_READWAIT BIT(4)
+#define JZ_MMC_STRPCL_RESET BIT(3)
+#define JZ_MMC_STRPCL_START_OP BIT(2)
+#define JZ_MMC_STRPCL_CLOCK_CONTROL (BIT(1) | BIT(0))
+#define JZ_MMC_STRPCL_CLOCK_STOP BIT(0)
+#define JZ_MMC_STRPCL_CLOCK_START BIT(1)
+
+
+#define JZ_MMC_STATUS_IS_RESETTING BIT(15)
+#define JZ_MMC_STATUS_SDIO_INT_ACTIVE BIT(14)
+#define JZ_MMC_STATUS_PRG_DONE BIT(13)
+#define JZ_MMC_STATUS_DATA_TRAN_DONE BIT(12)
+#define JZ_MMC_STATUS_END_CMD_RES BIT(11)
+#define JZ_MMC_STATUS_DATA_FIFO_AFULL BIT(10)
+#define JZ_MMC_STATUS_IS_READWAIT BIT(9)
+#define JZ_MMC_STATUS_CLK_EN BIT(8)
+#define JZ_MMC_STATUS_DATA_FIFO_FULL BIT(7)
+#define JZ_MMC_STATUS_DATA_FIFO_EMPTY BIT(6)
+#define JZ_MMC_STATUS_CRC_RES_ERR BIT(5)
+#define JZ_MMC_STATUS_CRC_READ_ERROR BIT(4)
+#define JZ_MMC_STATUS_TIMEOUT_WRITE BIT(3)
+#define JZ_MMC_STATUS_CRC_WRITE_ERROR BIT(2)
+#define JZ_MMC_STATUS_TIMEOUT_RES BIT(1)
+#define JZ_MMC_STATUS_TIMEOUT_READ BIT(0)
+
+#define JZ_MMC_STATUS_READ_ERROR_MASK (BIT(4) | BIT(0))
+#define JZ_MMC_STATUS_WRITE_ERROR_MASK (BIT(3) | BIT(2))
+
+
+#define JZ_MMC_CMDAT_IO_ABORT BIT(11)
+#define JZ_MMC_CMDAT_BUS_WIDTH_4BIT BIT(10)
+#define JZ_MMC_CMDAT_DMA_EN BIT(8)
+#define JZ_MMC_CMDAT_INIT BIT(7)
+#define JZ_MMC_CMDAT_BUSY BIT(6)
+#define JZ_MMC_CMDAT_STREAM BIT(5)
+#define JZ_MMC_CMDAT_WRITE BIT(4)
+#define JZ_MMC_CMDAT_DATA_EN BIT(3)
+#define JZ_MMC_CMDAT_RESPONSE_FORMAT (BIT(2) | BIT(1) | BIT(0))
+#define JZ_MMC_CMDAT_RSP_R1 1
+#define JZ_MMC_CMDAT_RSP_R2 2
+#define JZ_MMC_CMDAT_RSP_R3 3
+
+#define JZ_MMC_IRQ_SDIO BIT(7)
+#define JZ_MMC_IRQ_TXFIFO_WR_REQ BIT(6)
+#define JZ_MMC_IRQ_RXFIFO_RD_REQ BIT(5)
+#define JZ_MMC_IRQ_END_CMD_RES BIT(2)
+#define JZ_MMC_IRQ_PRG_DONE BIT(1)
+#define JZ_MMC_IRQ_DATA_TRAN_DONE BIT(0)
+
+
+#define JZ_MMC_CLK_RATE 24000000
+
+enum jz4740_mmc_state {
+ JZ4740_MMC_STATE_READ_RESPONSE,
+ JZ4740_MMC_STATE_TRANSFER_DATA,
+ JZ4740_MMC_STATE_SEND_STOP,
+ JZ4740_MMC_STATE_DONE,
+};
+
+struct jz4740_mmc_host_next {
+ int sg_len;
+ s32 cookie;
+};
+
+struct jz4740_mmc_host {
+ struct mmc_host *mmc;
+ struct platform_device *pdev;
+ struct jz4740_mmc_platform_data *pdata;
+ struct clk *clk;
+
+ int irq;
+ int card_detect_irq;
+
+ void __iomem *base;
+ struct resource *mem_res;
+ struct mmc_request *req;
+ struct mmc_command *cmd;
+
+ unsigned long waiting;
+
+ uint32_t cmdat;
+
+ uint16_t irq_mask;
+
+ spinlock_t lock;
+
+ struct timer_list timeout_timer;
+ struct sg_mapping_iter miter;
+ enum jz4740_mmc_state state;
+
+ /* DMA support */
+ struct dma_chan *dma_rx;
+ struct dma_chan *dma_tx;
+ struct jz4740_mmc_host_next next_data;
+ bool use_dma;
+ int sg_len;
+
+/* The DMA trigger level is 8 words, that is to say, the DMA read
+ * trigger is when data words in MSC_RXFIFO is >= 8 and the DMA write
+ * trigger is when data words in MSC_TXFIFO is < 8.
+ */
+#define JZ4740_MMC_FIFO_HALF_SIZE 8
+};
+
+/*----------------------------------------------------------------------------*/
+/* DMA infrastructure */
+
+static void jz4740_mmc_release_dma_channels(struct jz4740_mmc_host *host)
+{
+ if (!host->use_dma)
+ return;
+
+ dma_release_channel(host->dma_tx);
+ dma_release_channel(host->dma_rx);
+}
+
+static int jz4740_mmc_acquire_dma_channels(struct jz4740_mmc_host *host)
+{
+ dma_cap_mask_t mask;
+
+ dma_cap_zero(mask);
+ dma_cap_set(DMA_SLAVE, mask);
+
+ host->dma_tx = dma_request_channel(mask, NULL, host);
+ if (!host->dma_tx) {
+ dev_err(mmc_dev(host->mmc), "Failed to get dma_tx channel\n");
+ return -ENODEV;
+ }
+
+ host->dma_rx = dma_request_channel(mask, NULL, host);
+ if (!host->dma_rx) {
+ dev_err(mmc_dev(host->mmc), "Failed to get dma_rx channel\n");
+ goto free_master_write;
+ }
+
+ /* Initialize DMA pre request cookie */
+ host->next_data.cookie = 1;
+
+ return 0;
+
+free_master_write:
+ dma_release_channel(host->dma_tx);
+ return -ENODEV;
+}
+
+static inline int jz4740_mmc_get_dma_dir(struct mmc_data *data)
+{
+ return (data->flags & MMC_DATA_READ) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
+}
+
+static inline struct dma_chan *jz4740_mmc_get_dma_chan(struct jz4740_mmc_host *host,
+ struct mmc_data *data)
+{
+ return (data->flags & MMC_DATA_READ) ? host->dma_rx : host->dma_tx;
+}
+
+static void jz4740_mmc_dma_unmap(struct jz4740_mmc_host *host,
+ struct mmc_data *data)
+{
+ struct dma_chan *chan = jz4740_mmc_get_dma_chan(host, data);
+ enum dma_data_direction dir = jz4740_mmc_get_dma_dir(data);
+
+ dma_unmap_sg(chan->device->dev, data->sg, data->sg_len, dir);
+}
+
+/* Prepares DMA data for current/next transfer, returns non-zero on failure */
+static int jz4740_mmc_prepare_dma_data(struct jz4740_mmc_host *host,
+ struct mmc_data *data,
+ struct jz4740_mmc_host_next *next,
+ struct dma_chan *chan)
+{
+ struct jz4740_mmc_host_next *next_data = &host->next_data;
+ enum dma_data_direction dir = jz4740_mmc_get_dma_dir(data);
+ int sg_len;
+
+ if (!next && data->host_cookie &&
+ data->host_cookie != host->next_data.cookie) {
+ dev_warn(mmc_dev(host->mmc),
+ "[%s] invalid cookie: data->host_cookie %d host->next_data.cookie %d\n",
+ __func__,
+ data->host_cookie,
+ host->next_data.cookie);
+ data->host_cookie = 0;
+ }
+
+ /* Check if next job is already prepared */
+ if (next || data->host_cookie != host->next_data.cookie) {
+ sg_len = dma_map_sg(chan->device->dev,
+ data->sg,
+ data->sg_len,
+ dir);
+
+ } else {
+ sg_len = next_data->sg_len;
+ next_data->sg_len = 0;
+ }
+
+ if (sg_len <= 0) {
+ dev_err(mmc_dev(host->mmc),
+ "Failed to map scatterlist for DMA operation\n");
+ return -EINVAL;
+ }
+
+ if (next) {
+ next->sg_len = sg_len;
+ data->host_cookie = ++next->cookie < 0 ? 1 : next->cookie;
+ } else
+ host->sg_len = sg_len;
+
+ return 0;
+}
+
+static int jz4740_mmc_start_dma_transfer(struct jz4740_mmc_host *host,
+ struct mmc_data *data)
+{
+ int ret;
+ struct dma_chan *chan;
+ struct dma_async_tx_descriptor *desc;
+ struct dma_slave_config conf = {
+ .src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES,
+ .dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES,
+ .src_maxburst = JZ4740_MMC_FIFO_HALF_SIZE,
+ .dst_maxburst = JZ4740_MMC_FIFO_HALF_SIZE,
+ };
+
+ if (data->flags & MMC_DATA_WRITE) {
+ conf.direction = DMA_MEM_TO_DEV;
+ conf.dst_addr = host->mem_res->start + JZ_REG_MMC_TXFIFO;
+ conf.slave_id = JZ4740_DMA_TYPE_MMC_TRANSMIT;
+ chan = host->dma_tx;
+ } else {
+ conf.direction = DMA_DEV_TO_MEM;
+ conf.src_addr = host->mem_res->start + JZ_REG_MMC_RXFIFO;
+ conf.slave_id = JZ4740_DMA_TYPE_MMC_RECEIVE;
+ chan = host->dma_rx;
+ }
+
+ ret = jz4740_mmc_prepare_dma_data(host, data, NULL, chan);
+ if (ret)
+ return ret;
+
+ dmaengine_slave_config(chan, &conf);
+ desc = dmaengine_prep_slave_sg(chan,
+ data->sg,
+ host->sg_len,
+ conf.direction,
+ DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
+ if (!desc) {
+ dev_err(mmc_dev(host->mmc),
+ "Failed to allocate DMA %s descriptor",
+ conf.direction == DMA_MEM_TO_DEV ? "TX" : "RX");
+ goto dma_unmap;
+ }
+
+ dmaengine_submit(desc);
+ dma_async_issue_pending(chan);
+
+ return 0;
+
+dma_unmap:
+ jz4740_mmc_dma_unmap(host, data);
+ return -ENOMEM;
+}
+
+static void jz4740_mmc_pre_request(struct mmc_host *mmc,
+ struct mmc_request *mrq,
+ bool is_first_req)
+{
+ struct jz4740_mmc_host *host = mmc_priv(mmc);
+ struct mmc_data *data = mrq->data;
+ struct jz4740_mmc_host_next *next_data = &host->next_data;
+
+ BUG_ON(data->host_cookie);
+
+ if (host->use_dma) {
+ struct dma_chan *chan = jz4740_mmc_get_dma_chan(host, data);
+
+ if (jz4740_mmc_prepare_dma_data(host, data, next_data, chan))
+ data->host_cookie = 0;
+ }
+}
+
+static void jz4740_mmc_post_request(struct mmc_host *mmc,
+ struct mmc_request *mrq,
+ int err)
+{
+ struct jz4740_mmc_host *host = mmc_priv(mmc);
+ struct mmc_data *data = mrq->data;
+
+ if (host->use_dma && data->host_cookie) {
+ jz4740_mmc_dma_unmap(host, data);
+ data->host_cookie = 0;
+ }
+
+ if (err) {
+ struct dma_chan *chan = jz4740_mmc_get_dma_chan(host, data);
+
+ dmaengine_terminate_all(chan);
+ }
+}
+
+/*----------------------------------------------------------------------------*/
+
+static void jz4740_mmc_set_irq_enabled(struct jz4740_mmc_host *host,
+ unsigned int irq, bool enabled)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&host->lock, flags);
+ if (enabled)
+ host->irq_mask &= ~irq;
+ else
+ host->irq_mask |= irq;
+ spin_unlock_irqrestore(&host->lock, flags);
+
+ writew(host->irq_mask, host->base + JZ_REG_MMC_IMASK);
+}
+
+static void jz4740_mmc_clock_enable(struct jz4740_mmc_host *host,
+ bool start_transfer)
+{
+ uint16_t val = JZ_MMC_STRPCL_CLOCK_START;
+
+ if (start_transfer)
+ val |= JZ_MMC_STRPCL_START_OP;
+
+ writew(val, host->base + JZ_REG_MMC_STRPCL);
+}
+
+static void jz4740_mmc_clock_disable(struct jz4740_mmc_host *host)
+{
+ uint32_t status;
+ unsigned int timeout = 1000;
+
+ writew(JZ_MMC_STRPCL_CLOCK_STOP, host->base + JZ_REG_MMC_STRPCL);
+ do {
+ status = readl(host->base + JZ_REG_MMC_STATUS);
+ } while (status & JZ_MMC_STATUS_CLK_EN && --timeout);
+}
+
+static void jz4740_mmc_reset(struct jz4740_mmc_host *host)
+{
+ uint32_t status;
+ unsigned int timeout = 1000;
+
+ writew(JZ_MMC_STRPCL_RESET, host->base + JZ_REG_MMC_STRPCL);
+ udelay(10);
+ do {
+ status = readl(host->base + JZ_REG_MMC_STATUS);
+ } while (status & JZ_MMC_STATUS_IS_RESETTING && --timeout);
+}
+
+static void jz4740_mmc_request_done(struct jz4740_mmc_host *host)
+{
+ struct mmc_request *req;
+
+ req = host->req;
+ host->req = NULL;
+
+ mmc_request_done(host->mmc, req);
+}
+
+static unsigned int jz4740_mmc_poll_irq(struct jz4740_mmc_host *host,
+ unsigned int irq)
+{
+ unsigned int timeout = 0x800;
+ uint16_t status;
+
+ do {
+ status = readw(host->base + JZ_REG_MMC_IREG);
+ } while (!(status & irq) && --timeout);
+
+ if (timeout == 0) {
+ set_bit(0, &host->waiting);
+ mod_timer(&host->timeout_timer, jiffies + 5*HZ);
+ jz4740_mmc_set_irq_enabled(host, irq, true);
+ return true;
+ }
+
+ return false;
+}
+
+static void jz4740_mmc_transfer_check_state(struct jz4740_mmc_host *host,
+ struct mmc_data *data)
+{
+ int status;
+
+ status = readl(host->base + JZ_REG_MMC_STATUS);
+ if (status & JZ_MMC_STATUS_WRITE_ERROR_MASK) {
+ if (status & (JZ_MMC_STATUS_TIMEOUT_WRITE)) {
+ host->req->cmd->error = -ETIMEDOUT;
+ data->error = -ETIMEDOUT;
+ } else {
+ host->req->cmd->error = -EIO;
+ data->error = -EIO;
+ }
+ } else if (status & JZ_MMC_STATUS_READ_ERROR_MASK) {
+ if (status & (JZ_MMC_STATUS_TIMEOUT_READ)) {
+ host->req->cmd->error = -ETIMEDOUT;
+ data->error = -ETIMEDOUT;
+ } else {
+ host->req->cmd->error = -EIO;
+ data->error = -EIO;
+ }
+ }
+}
+
+static bool jz4740_mmc_write_data(struct jz4740_mmc_host *host,
+ struct mmc_data *data)
+{
+ struct sg_mapping_iter *miter = &host->miter;
+ void __iomem *fifo_addr = host->base + JZ_REG_MMC_TXFIFO;
+ uint32_t *buf;
+ bool timeout;
+ size_t i, j;
+
+ while (sg_miter_next(miter)) {
+ buf = miter->addr;
+ i = miter->length / 4;
+ j = i / 8;
+ i = i & 0x7;
+ while (j) {
+ timeout = jz4740_mmc_poll_irq(host, JZ_MMC_IRQ_TXFIFO_WR_REQ);
+ if (unlikely(timeout))
+ goto poll_timeout;
+
+ writel(buf[0], fifo_addr);
+ writel(buf[1], fifo_addr);
+ writel(buf[2], fifo_addr);
+ writel(buf[3], fifo_addr);
+ writel(buf[4], fifo_addr);
+ writel(buf[5], fifo_addr);
+ writel(buf[6], fifo_addr);
+ writel(buf[7], fifo_addr);
+ buf += 8;
+ --j;
+ }
+ if (unlikely(i)) {
+ timeout = jz4740_mmc_poll_irq(host, JZ_MMC_IRQ_TXFIFO_WR_REQ);
+ if (unlikely(timeout))
+ goto poll_timeout;
+
+ while (i) {
+ writel(*buf, fifo_addr);
+ ++buf;
+ --i;
+ }
+ }
+ data->bytes_xfered += miter->length;
+ }
+ sg_miter_stop(miter);
+
+ return false;
+
+poll_timeout:
+ miter->consumed = (void *)buf - miter->addr;
+ data->bytes_xfered += miter->consumed;
+ sg_miter_stop(miter);
+
+ return true;
+}
+
+static bool jz4740_mmc_read_data(struct jz4740_mmc_host *host,
+ struct mmc_data *data)
+{
+ struct sg_mapping_iter *miter = &host->miter;
+ void __iomem *fifo_addr = host->base + JZ_REG_MMC_RXFIFO;
+ uint32_t *buf;
+ uint32_t d;
+ uint16_t status;
+ size_t i, j;
+ unsigned int timeout;
+
+ while (sg_miter_next(miter)) {
+ buf = miter->addr;
+ i = miter->length;
+ j = i / 32;
+ i = i & 0x1f;
+ while (j) {
+ timeout = jz4740_mmc_poll_irq(host, JZ_MMC_IRQ_RXFIFO_RD_REQ);
+ if (unlikely(timeout))
+ goto poll_timeout;
+
+ buf[0] = readl(fifo_addr);
+ buf[1] = readl(fifo_addr);
+ buf[2] = readl(fifo_addr);
+ buf[3] = readl(fifo_addr);
+ buf[4] = readl(fifo_addr);
+ buf[5] = readl(fifo_addr);
+ buf[6] = readl(fifo_addr);
+ buf[7] = readl(fifo_addr);
+
+ buf += 8;
+ --j;
+ }
+
+ if (unlikely(i)) {
+ timeout = jz4740_mmc_poll_irq(host, JZ_MMC_IRQ_RXFIFO_RD_REQ);
+ if (unlikely(timeout))
+ goto poll_timeout;
+
+ while (i >= 4) {
+ *buf++ = readl(fifo_addr);
+ i -= 4;
+ }
+ if (unlikely(i > 0)) {
+ d = readl(fifo_addr);
+ memcpy(buf, &d, i);
+ }
+ }
+ data->bytes_xfered += miter->length;
+
+ /* This can go away once MIPS implements
+ * flush_kernel_dcache_page */
+ flush_dcache_page(miter->page);
+ }
+ sg_miter_stop(miter);
+
+ /* For whatever reason there is sometime one word more in the fifo then
+ * requested */
+ timeout = 1000;
+ status = readl(host->base + JZ_REG_MMC_STATUS);
+ while (!(status & JZ_MMC_STATUS_DATA_FIFO_EMPTY) && --timeout) {
+ d = readl(fifo_addr);
+ status = readl(host->base + JZ_REG_MMC_STATUS);
+ }
+
+ return false;
+
+poll_timeout:
+ miter->consumed = (void *)buf - miter->addr;
+ data->bytes_xfered += miter->consumed;
+ sg_miter_stop(miter);
+
+ return true;
+}
+
+static void jz4740_mmc_timeout(unsigned long data)
+{
+ struct jz4740_mmc_host *host = (struct jz4740_mmc_host *)data;
+
+ if (!test_and_clear_bit(0, &host->waiting))
+ return;
+
+ jz4740_mmc_set_irq_enabled(host, JZ_MMC_IRQ_END_CMD_RES, false);
+
+ host->req->cmd->error = -ETIMEDOUT;
+ jz4740_mmc_request_done(host);
+}
+
+static void jz4740_mmc_read_response(struct jz4740_mmc_host *host,
+ struct mmc_command *cmd)
+{
+ int i;
+ uint16_t tmp;
+ void __iomem *fifo_addr = host->base + JZ_REG_MMC_RESP_FIFO;
+
+ if (cmd->flags & MMC_RSP_136) {
+ tmp = readw(fifo_addr);
+ for (i = 0; i < 4; ++i) {
+ cmd->resp[i] = tmp << 24;
+ tmp = readw(fifo_addr);
+ cmd->resp[i] |= tmp << 8;
+ tmp = readw(fifo_addr);
+ cmd->resp[i] |= tmp >> 8;
+ }
+ } else {
+ cmd->resp[0] = readw(fifo_addr) << 24;
+ cmd->resp[0] |= readw(fifo_addr) << 8;
+ cmd->resp[0] |= readw(fifo_addr) & 0xff;
+ }
+}
+
+static void jz4740_mmc_send_command(struct jz4740_mmc_host *host,
+ struct mmc_command *cmd)
+{
+ uint32_t cmdat = host->cmdat;
+
+ host->cmdat &= ~JZ_MMC_CMDAT_INIT;
+ jz4740_mmc_clock_disable(host);
+
+ host->cmd = cmd;
+
+ if (cmd->flags & MMC_RSP_BUSY)
+ cmdat |= JZ_MMC_CMDAT_BUSY;
+
+ switch (mmc_resp_type(cmd)) {
+ case MMC_RSP_R1B:
+ case MMC_RSP_R1:
+ cmdat |= JZ_MMC_CMDAT_RSP_R1;
+ break;
+ case MMC_RSP_R2:
+ cmdat |= JZ_MMC_CMDAT_RSP_R2;
+ break;
+ case MMC_RSP_R3:
+ cmdat |= JZ_MMC_CMDAT_RSP_R3;
+ break;
+ default:
+ break;
+ }
+
+ if (cmd->data) {
+ cmdat |= JZ_MMC_CMDAT_DATA_EN;
+ if (cmd->data->flags & MMC_DATA_WRITE)
+ cmdat |= JZ_MMC_CMDAT_WRITE;
+ if (cmd->data->flags & MMC_DATA_STREAM)
+ cmdat |= JZ_MMC_CMDAT_STREAM;
+ if (host->use_dma)
+ cmdat |= JZ_MMC_CMDAT_DMA_EN;
+
+ writew(cmd->data->blksz, host->base + JZ_REG_MMC_BLKLEN);
+ writew(cmd->data->blocks, host->base + JZ_REG_MMC_NOB);
+ }
+
+ writeb(cmd->opcode, host->base + JZ_REG_MMC_CMD);
+ writel(cmd->arg, host->base + JZ_REG_MMC_ARG);
+ writel(cmdat, host->base + JZ_REG_MMC_CMDAT);
+
+ jz4740_mmc_clock_enable(host, 1);
+}
+
+static void jz_mmc_prepare_data_transfer(struct jz4740_mmc_host *host)
+{
+ struct mmc_command *cmd = host->req->cmd;
+ struct mmc_data *data = cmd->data;
+ int direction;
+
+ if (data->flags & MMC_DATA_READ)
+ direction = SG_MITER_TO_SG;
+ else
+ direction = SG_MITER_FROM_SG;
+
+ sg_miter_start(&host->miter, data->sg, data->sg_len, direction);
+}
+
+
+static irqreturn_t jz_mmc_irq_worker(int irq, void *devid)
+{
+ struct jz4740_mmc_host *host = (struct jz4740_mmc_host *)devid;
+ struct mmc_command *cmd = host->req->cmd;
+ struct mmc_request *req = host->req;
+ struct mmc_data *data = cmd->data;
+ bool timeout = false;
+
+ if (cmd->error)
+ host->state = JZ4740_MMC_STATE_DONE;
+
+ switch (host->state) {
+ case JZ4740_MMC_STATE_READ_RESPONSE:
+ if (cmd->flags & MMC_RSP_PRESENT)
+ jz4740_mmc_read_response(host, cmd);
+
+ if (!data)
+ break;
+
+ jz_mmc_prepare_data_transfer(host);
+
+ case JZ4740_MMC_STATE_TRANSFER_DATA:
+ if (host->use_dma) {
+ /* Use DMA if enabled.
+ * Data transfer direction is defined later by
+ * relying on data flags in
+ * jz4740_mmc_prepare_dma_data() and
+ * jz4740_mmc_start_dma_transfer().
+ */
+ timeout = jz4740_mmc_start_dma_transfer(host, data);
+ data->bytes_xfered = data->blocks * data->blksz;
+ } else if (data->flags & MMC_DATA_READ)
+ /* Use PIO if DMA is not enabled.
+ * Data transfer direction was defined before
+ * by relying on data flags in
+ * jz_mmc_prepare_data_transfer().
+ */
+ timeout = jz4740_mmc_read_data(host, data);
+ else
+ timeout = jz4740_mmc_write_data(host, data);
+
+ if (unlikely(timeout)) {
+ host->state = JZ4740_MMC_STATE_TRANSFER_DATA;
+ break;
+ }
+
+ jz4740_mmc_transfer_check_state(host, data);
+
+ timeout = jz4740_mmc_poll_irq(host, JZ_MMC_IRQ_DATA_TRAN_DONE);
+ if (unlikely(timeout)) {
+ host->state = JZ4740_MMC_STATE_SEND_STOP;
+ break;
+ }
+ writew(JZ_MMC_IRQ_DATA_TRAN_DONE, host->base + JZ_REG_MMC_IREG);
+
+ case JZ4740_MMC_STATE_SEND_STOP:
+ if (!req->stop)
+ break;
+
+ jz4740_mmc_send_command(host, req->stop);
+
+ if (mmc_resp_type(req->stop) & MMC_RSP_BUSY) {
+ timeout = jz4740_mmc_poll_irq(host,
+ JZ_MMC_IRQ_PRG_DONE);
+ if (timeout) {
+ host->state = JZ4740_MMC_STATE_DONE;
+ break;
+ }
+ }
+ case JZ4740_MMC_STATE_DONE:
+ break;
+ }
+
+ if (!timeout)
+ jz4740_mmc_request_done(host);
+
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t jz_mmc_irq(int irq, void *devid)
+{
+ struct jz4740_mmc_host *host = devid;
+ struct mmc_command *cmd = host->cmd;
+ uint16_t irq_reg, status, tmp;
+
+ irq_reg = readw(host->base + JZ_REG_MMC_IREG);
+
+ tmp = irq_reg;
+ irq_reg &= ~host->irq_mask;
+
+ tmp &= ~(JZ_MMC_IRQ_TXFIFO_WR_REQ | JZ_MMC_IRQ_RXFIFO_RD_REQ |
+ JZ_MMC_IRQ_PRG_DONE | JZ_MMC_IRQ_DATA_TRAN_DONE);
+
+ if (tmp != irq_reg)
+ writew(tmp & ~irq_reg, host->base + JZ_REG_MMC_IREG);
+
+ if (irq_reg & JZ_MMC_IRQ_SDIO) {
+ writew(JZ_MMC_IRQ_SDIO, host->base + JZ_REG_MMC_IREG);
+ mmc_signal_sdio_irq(host->mmc);
+ irq_reg &= ~JZ_MMC_IRQ_SDIO;
+ }
+
+ if (host->req && cmd && irq_reg) {
+ if (test_and_clear_bit(0, &host->waiting)) {
+ del_timer(&host->timeout_timer);
+
+ status = readl(host->base + JZ_REG_MMC_STATUS);
+
+ if (status & JZ_MMC_STATUS_TIMEOUT_RES) {
+ cmd->error = -ETIMEDOUT;
+ } else if (status & JZ_MMC_STATUS_CRC_RES_ERR) {
+ cmd->error = -EIO;
+ } else if (status & (JZ_MMC_STATUS_CRC_READ_ERROR |
+ JZ_MMC_STATUS_CRC_WRITE_ERROR)) {
+ if (cmd->data)
+ cmd->data->error = -EIO;
+ cmd->error = -EIO;
+ }
+
+ jz4740_mmc_set_irq_enabled(host, irq_reg, false);
+ writew(irq_reg, host->base + JZ_REG_MMC_IREG);
+
+ return IRQ_WAKE_THREAD;
+ }
+ }
+
+ return IRQ_HANDLED;
+}
+
+static int jz4740_mmc_set_clock_rate(struct jz4740_mmc_host *host, int rate)
+{
+ int div = 0;
+ int real_rate;
+
+ jz4740_mmc_clock_disable(host);
+ clk_set_rate(host->clk, JZ_MMC_CLK_RATE);
+
+ real_rate = clk_get_rate(host->clk);
+
+ while (real_rate > rate && div < 7) {
+ ++div;
+ real_rate >>= 1;
+ }
+
+ writew(div, host->base + JZ_REG_MMC_CLKRT);
+ return real_rate;
+}
+
+static void jz4740_mmc_request(struct mmc_host *mmc, struct mmc_request *req)
+{
+ struct jz4740_mmc_host *host = mmc_priv(mmc);
+
+ host->req = req;
+
+ writew(0xffff, host->base + JZ_REG_MMC_IREG);
+
+ writew(JZ_MMC_IRQ_END_CMD_RES, host->base + JZ_REG_MMC_IREG);
+ jz4740_mmc_set_irq_enabled(host, JZ_MMC_IRQ_END_CMD_RES, true);
+
+ host->state = JZ4740_MMC_STATE_READ_RESPONSE;
+ set_bit(0, &host->waiting);
+ mod_timer(&host->timeout_timer, jiffies + 5*HZ);
+ jz4740_mmc_send_command(host, req->cmd);
+}
+
+static void jz4740_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
+{
+ struct jz4740_mmc_host *host = mmc_priv(mmc);
+ if (ios->clock)
+ jz4740_mmc_set_clock_rate(host, ios->clock);
+
+ switch (ios->power_mode) {
+ case MMC_POWER_UP:
+ jz4740_mmc_reset(host);
+ if (gpio_is_valid(host->pdata->gpio_power))
+ gpio_set_value(host->pdata->gpio_power,
+ !host->pdata->power_active_low);
+ host->cmdat |= JZ_MMC_CMDAT_INIT;
+ clk_prepare_enable(host->clk);
+ break;
+ case MMC_POWER_ON:
+ break;
+ default:
+ if (gpio_is_valid(host->pdata->gpio_power))
+ gpio_set_value(host->pdata->gpio_power,
+ host->pdata->power_active_low);
+ clk_disable_unprepare(host->clk);
+ break;
+ }
+
+ switch (ios->bus_width) {
+ case MMC_BUS_WIDTH_1:
+ host->cmdat &= ~JZ_MMC_CMDAT_BUS_WIDTH_4BIT;
+ break;
+ case MMC_BUS_WIDTH_4:
+ host->cmdat |= JZ_MMC_CMDAT_BUS_WIDTH_4BIT;
+ break;
+ default:
+ break;
+ }
+}
+
+static void jz4740_mmc_enable_sdio_irq(struct mmc_host *mmc, int enable)
+{
+ struct jz4740_mmc_host *host = mmc_priv(mmc);
+ jz4740_mmc_set_irq_enabled(host, JZ_MMC_IRQ_SDIO, enable);
+}
+
+static const struct mmc_host_ops jz4740_mmc_ops = {
+ .request = jz4740_mmc_request,
+ .pre_req = jz4740_mmc_pre_request,
+ .post_req = jz4740_mmc_post_request,
+ .set_ios = jz4740_mmc_set_ios,
+ .get_ro = mmc_gpio_get_ro,
+ .get_cd = mmc_gpio_get_cd,
+ .enable_sdio_irq = jz4740_mmc_enable_sdio_irq,
+};
+
+static const struct jz_gpio_bulk_request jz4740_mmc_pins[] = {
+ JZ_GPIO_BULK_PIN(MSC_CMD),
+ JZ_GPIO_BULK_PIN(MSC_CLK),
+ JZ_GPIO_BULK_PIN(MSC_DATA0),
+ JZ_GPIO_BULK_PIN(MSC_DATA1),
+ JZ_GPIO_BULK_PIN(MSC_DATA2),
+ JZ_GPIO_BULK_PIN(MSC_DATA3),
+};
+
+static int jz4740_mmc_request_gpio(struct device *dev, int gpio,
+ const char *name, bool output, int value)
+{
+ int ret;
+
+ if (!gpio_is_valid(gpio))
+ return 0;
+
+ ret = gpio_request(gpio, name);
+ if (ret) {
+ dev_err(dev, "Failed to request %s gpio: %d\n", name, ret);
+ return ret;
+ }
+
+ if (output)
+ gpio_direction_output(gpio, value);
+ else
+ gpio_direction_input(gpio);
+
+ return 0;
+}
+
+static int jz4740_mmc_request_gpios(struct mmc_host *mmc,
+ struct platform_device *pdev)
+{
+ struct jz4740_mmc_platform_data *pdata = pdev->dev.platform_data;
+ int ret = 0;
+
+ if (!pdata)
+ return 0;
+
+ if (!pdata->card_detect_active_low)
+ mmc->caps2 |= MMC_CAP2_CD_ACTIVE_HIGH;
+ if (!pdata->read_only_active_low)
+ mmc->caps2 |= MMC_CAP2_RO_ACTIVE_HIGH;
+
+ if (gpio_is_valid(pdata->gpio_card_detect)) {
+ ret = mmc_gpio_request_cd(mmc, pdata->gpio_card_detect, 0);
+ if (ret)
+ return ret;
+ }
+
+ if (gpio_is_valid(pdata->gpio_read_only)) {
+ ret = mmc_gpio_request_ro(mmc, pdata->gpio_read_only);
+ if (ret)
+ return ret;
+ }
+
+ return jz4740_mmc_request_gpio(&pdev->dev, pdata->gpio_power,
+ "MMC read only", true, pdata->power_active_low);
+}
+
+static void jz4740_mmc_free_gpios(struct platform_device *pdev)
+{
+ struct jz4740_mmc_platform_data *pdata = pdev->dev.platform_data;
+
+ if (!pdata)
+ return;
+
+ if (gpio_is_valid(pdata->gpio_power))
+ gpio_free(pdata->gpio_power);
+}
+
+static inline size_t jz4740_mmc_num_pins(struct jz4740_mmc_host *host)
+{
+ size_t num_pins = ARRAY_SIZE(jz4740_mmc_pins);
+ if (host->pdata && host->pdata->data_1bit)
+ num_pins -= 3;
+
+ return num_pins;
+}
+
+static int jz4740_mmc_probe(struct platform_device* pdev)
+{
+ int ret;
+ struct mmc_host *mmc;
+ struct jz4740_mmc_host *host;
+ struct jz4740_mmc_platform_data *pdata;
+
+ pdata = pdev->dev.platform_data;
+
+ mmc = mmc_alloc_host(sizeof(struct jz4740_mmc_host), &pdev->dev);
+ if (!mmc) {
+ dev_err(&pdev->dev, "Failed to alloc mmc host structure\n");
+ return -ENOMEM;
+ }
+
+ host = mmc_priv(mmc);
+ host->pdata = pdata;
+
+ host->irq = platform_get_irq(pdev, 0);
+ if (host->irq < 0) {
+ ret = host->irq;
+ dev_err(&pdev->dev, "Failed to get platform irq: %d\n", ret);
+ goto err_free_host;
+ }
+
+ host->clk = devm_clk_get(&pdev->dev, "mmc");
+ if (IS_ERR(host->clk)) {
+ ret = PTR_ERR(host->clk);
+ dev_err(&pdev->dev, "Failed to get mmc clock\n");
+ goto err_free_host;
+ }
+
+ host->mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ host->base = devm_ioremap_resource(&pdev->dev, host->mem_res);
+ if (IS_ERR(host->base)) {
+ ret = PTR_ERR(host->base);
+ dev_err(&pdev->dev, "Failed to ioremap base memory\n");
+ goto err_free_host;
+ }
+
+ ret = jz_gpio_bulk_request(jz4740_mmc_pins, jz4740_mmc_num_pins(host));
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to request mmc pins: %d\n", ret);
+ goto err_free_host;
+ }
+
+ ret = jz4740_mmc_request_gpios(mmc, pdev);
+ if (ret)
+ goto err_gpio_bulk_free;
+
+ mmc->ops = &jz4740_mmc_ops;
+ mmc->f_min = JZ_MMC_CLK_RATE / 128;
+ mmc->f_max = JZ_MMC_CLK_RATE;
+ mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
+ mmc->caps = (pdata && pdata->data_1bit) ? 0 : MMC_CAP_4_BIT_DATA;
+ mmc->caps |= MMC_CAP_SDIO_IRQ;
+
+ mmc->max_blk_size = (1 << 10) - 1;
+ mmc->max_blk_count = (1 << 15) - 1;
+ mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
+
+ mmc->max_segs = 128;
+ mmc->max_seg_size = mmc->max_req_size;
+
+ host->mmc = mmc;
+ host->pdev = pdev;
+ spin_lock_init(&host->lock);
+ host->irq_mask = 0xffff;
+
+ ret = request_threaded_irq(host->irq, jz_mmc_irq, jz_mmc_irq_worker, 0,
+ dev_name(&pdev->dev), host);
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to request irq: %d\n", ret);
+ goto err_free_gpios;
+ }
+
+ jz4740_mmc_reset(host);
+ jz4740_mmc_clock_disable(host);
+ setup_timer(&host->timeout_timer, jz4740_mmc_timeout,
+ (unsigned long)host);
+ /* It is not important when it times out, it just needs to timeout. */
+ set_timer_slack(&host->timeout_timer, HZ);
+
+ host->use_dma = true;
+ if (host->use_dma && jz4740_mmc_acquire_dma_channels(host) != 0)
+ host->use_dma = false;
+
+ platform_set_drvdata(pdev, host);
+ ret = mmc_add_host(mmc);
+
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to add mmc host: %d\n", ret);
+ goto err_free_irq;
+ }
+ dev_info(&pdev->dev, "JZ SD/MMC card driver registered\n");
+
+ dev_info(&pdev->dev, "Using %s, %d-bit mode\n",
+ host->use_dma ? "DMA" : "PIO",
+ (mmc->caps & MMC_CAP_4_BIT_DATA) ? 4 : 1);
+
+ return 0;
+
+err_free_irq:
+ free_irq(host->irq, host);
+err_free_gpios:
+ jz4740_mmc_free_gpios(pdev);
+err_gpio_bulk_free:
+ if (host->use_dma)
+ jz4740_mmc_release_dma_channels(host);
+ jz_gpio_bulk_free(jz4740_mmc_pins, jz4740_mmc_num_pins(host));
+err_free_host:
+ mmc_free_host(mmc);
+
+ return ret;
+}
+
+static int jz4740_mmc_remove(struct platform_device *pdev)
+{
+ struct jz4740_mmc_host *host = platform_get_drvdata(pdev);
+
+ del_timer_sync(&host->timeout_timer);
+ jz4740_mmc_set_irq_enabled(host, 0xff, false);
+ jz4740_mmc_reset(host);
+
+ mmc_remove_host(host->mmc);
+
+ free_irq(host->irq, host);
+
+ jz4740_mmc_free_gpios(pdev);
+ jz_gpio_bulk_free(jz4740_mmc_pins, jz4740_mmc_num_pins(host));
+
+ if (host->use_dma)
+ jz4740_mmc_release_dma_channels(host);
+
+ mmc_free_host(host->mmc);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+
+static int jz4740_mmc_suspend(struct device *dev)
+{
+ struct jz4740_mmc_host *host = dev_get_drvdata(dev);
+
+ jz_gpio_bulk_suspend(jz4740_mmc_pins, jz4740_mmc_num_pins(host));
+
+ return 0;
+}
+
+static int jz4740_mmc_resume(struct device *dev)
+{
+ struct jz4740_mmc_host *host = dev_get_drvdata(dev);
+
+ jz_gpio_bulk_resume(jz4740_mmc_pins, jz4740_mmc_num_pins(host));
+
+ return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(jz4740_mmc_pm_ops, jz4740_mmc_suspend,
+ jz4740_mmc_resume);
+#define JZ4740_MMC_PM_OPS (&jz4740_mmc_pm_ops)
+#else
+#define JZ4740_MMC_PM_OPS NULL
+#endif
+
+static struct platform_driver jz4740_mmc_driver = {
+ .probe = jz4740_mmc_probe,
+ .remove = jz4740_mmc_remove,
+ .driver = {
+ .name = "jz4740-mmc",
+ .pm = JZ4740_MMC_PM_OPS,
+ },
+};
+
+module_platform_driver(jz4740_mmc_driver);
+
+MODULE_DESCRIPTION("JZ4740 SD/MMC controller driver");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
Code Review / kvmfornfv.git / blobdiff