--- /dev/null
+/*
+ * tifm_sd.c - TI FlashMedia driver
+ *
+ * Copyright (C) 2006 Alex Dubov <oakad@yahoo.com>
+ *
+ * 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/tifm.h>
+#include <linux/mmc/protocol.h>
+#include <linux/mmc/host.h>
+#include <linux/highmem.h>
+#include <asm/io.h>
+
+#define DRIVER_NAME "tifm_sd"
+#define DRIVER_VERSION "0.6"
+
+static int no_dma = 0;
+static int fixed_timeout = 0;
+module_param(no_dma, bool, 0644);
+module_param(fixed_timeout, bool, 0644);
+
+/* Constants here are mostly from OMAP5912 datasheet */
+#define TIFM_MMCSD_RESET 0x0002
+#define TIFM_MMCSD_CLKMASK 0x03ff
+#define TIFM_MMCSD_POWER 0x0800
+#define TIFM_MMCSD_4BBUS 0x8000
+#define TIFM_MMCSD_RXDE 0x8000 /* rx dma enable */
+#define TIFM_MMCSD_TXDE 0x0080 /* tx dma enable */
+#define TIFM_MMCSD_BUFINT 0x0c00 /* set bits: AE, AF */
+#define TIFM_MMCSD_DPE 0x0020 /* data timeout counted in kilocycles */
+#define TIFM_MMCSD_INAB 0x0080 /* abort / initialize command */
+#define TIFM_MMCSD_READ 0x8000
+
+#define TIFM_MMCSD_DATAMASK 0x001d /* set bits: EOFB, BRS, CB, EOC */
+#define TIFM_MMCSD_ERRMASK 0x41e0 /* set bits: CERR, CCRC, CTO, DCRC, DTO */
+#define TIFM_MMCSD_EOC 0x0001 /* end of command phase */
+#define TIFM_MMCSD_CB 0x0004 /* card enter busy state */
+#define TIFM_MMCSD_BRS 0x0008 /* block received/sent */
+#define TIFM_MMCSD_EOFB 0x0010 /* card exit busy state */
+#define TIFM_MMCSD_DTO 0x0020 /* data time-out */
+#define TIFM_MMCSD_DCRC 0x0040 /* data crc error */
+#define TIFM_MMCSD_CTO 0x0080 /* command time-out */
+#define TIFM_MMCSD_CCRC 0x0100 /* command crc error */
+#define TIFM_MMCSD_AF 0x0400 /* fifo almost full */
+#define TIFM_MMCSD_AE 0x0800 /* fifo almost empty */
+#define TIFM_MMCSD_CERR 0x4000 /* card status error */
+
+#define TIFM_MMCSD_FIFO_SIZE 0x0020
+
+#define TIFM_MMCSD_RSP_R0 0x0000
+#define TIFM_MMCSD_RSP_R1 0x0100
+#define TIFM_MMCSD_RSP_R2 0x0200
+#define TIFM_MMCSD_RSP_R3 0x0300
+#define TIFM_MMCSD_RSP_R4 0x0400
+#define TIFM_MMCSD_RSP_R5 0x0500
+#define TIFM_MMCSD_RSP_R6 0x0600
+
+#define TIFM_MMCSD_RSP_BUSY 0x0800
+
+#define TIFM_MMCSD_CMD_BC 0x0000
+#define TIFM_MMCSD_CMD_BCR 0x1000
+#define TIFM_MMCSD_CMD_AC 0x2000
+#define TIFM_MMCSD_CMD_ADTC 0x3000
+
+typedef enum {
+ IDLE = 0,
+ CMD, /* main command ended */
+ BRS, /* block transfer finished */
+ SCMD, /* stop command ended */
+ CARD, /* card left busy state */
+ FIFO, /* FIFO operation completed (uncertain) */
+ READY
+} card_state_t;
+
+enum {
+ FIFO_RDY = 0x0001, /* hardware dependent value */
+ HOST_REG = 0x0002,
+ EJECT = 0x0004,
+ EJECT_DONE = 0x0008,
+ CARD_BUSY = 0x0010,
+ OPENDRAIN = 0x0040, /* hardware dependent value */
+ CARD_EVENT = 0x0100, /* hardware dependent value */
+ CARD_RO = 0x0200, /* hardware dependent value */
+ FIFO_EVENT = 0x10000 }; /* hardware dependent value */
+
+struct tifm_sd {
+ struct tifm_dev *dev;
+
+ unsigned int flags;
+ card_state_t state;
+ unsigned int clk_freq;
+ unsigned int clk_div;
+ unsigned long timeout_jiffies; // software timeout - 2 sec
+
+ struct mmc_request *req;
+ struct work_struct cmd_handler;
+ struct delayed_work abort_handler;
+ wait_queue_head_t can_eject;
+
+ size_t written_blocks;
+ char *buffer;
+ size_t buffer_size;
+ size_t buffer_pos;
+
+};
+
+static int tifm_sd_transfer_data(struct tifm_dev *sock, struct tifm_sd *host,
+ unsigned int host_status)
+{
+ struct mmc_command *cmd = host->req->cmd;
+ unsigned int t_val = 0, cnt = 0;
+
+ if (host_status & TIFM_MMCSD_BRS) {
+ /* in non-dma rx mode BRS fires when fifo is still not empty */
+ if (host->buffer && (cmd->data->flags & MMC_DATA_READ)) {
+ while (host->buffer_size > host->buffer_pos) {
+ t_val = readl(sock->addr + SOCK_MMCSD_DATA);
+ host->buffer[host->buffer_pos++] = t_val & 0xff;
+ host->buffer[host->buffer_pos++] =
+ (t_val >> 8) & 0xff;
+ }
+ }
+ return 1;
+ } else if (host->buffer) {
+ if ((cmd->data->flags & MMC_DATA_READ) &&
+ (host_status & TIFM_MMCSD_AF)) {
+ for (cnt = 0; cnt < TIFM_MMCSD_FIFO_SIZE; cnt++) {
+ t_val = readl(sock->addr + SOCK_MMCSD_DATA);
+ if (host->buffer_size > host->buffer_pos) {
+ host->buffer[host->buffer_pos++] =
+ t_val & 0xff;
+ host->buffer[host->buffer_pos++] =
+ (t_val >> 8) & 0xff;
+ }
+ }
+ } else if ((cmd->data->flags & MMC_DATA_WRITE)
+ && (host_status & TIFM_MMCSD_AE)) {
+ for (cnt = 0; cnt < TIFM_MMCSD_FIFO_SIZE; cnt++) {
+ if (host->buffer_size > host->buffer_pos) {
+ t_val = host->buffer[host->buffer_pos++] & 0x00ff;
+ t_val |= ((host->buffer[host->buffer_pos++]) << 8)
+ & 0xff00;
+ writel(t_val,
+ sock->addr + SOCK_MMCSD_DATA);
+ }
+ }
+ }
+ }
+ return 0;
+}
+
+static unsigned int tifm_sd_op_flags(struct mmc_command *cmd)
+{
+ unsigned int rc = 0;
+
+ switch (mmc_resp_type(cmd)) {
+ case MMC_RSP_NONE:
+ rc |= TIFM_MMCSD_RSP_R0;
+ break;
+ case MMC_RSP_R1B:
+ rc |= TIFM_MMCSD_RSP_BUSY; // deliberate fall-through
+ case MMC_RSP_R1:
+ rc |= TIFM_MMCSD_RSP_R1;
+ break;
+ case MMC_RSP_R2:
+ rc |= TIFM_MMCSD_RSP_R2;
+ break;
+ case MMC_RSP_R3:
+ rc |= TIFM_MMCSD_RSP_R3;
+ break;
+ default:
+ BUG();
+ }
+
+ switch (mmc_cmd_type(cmd)) {
+ case MMC_CMD_BC:
+ rc |= TIFM_MMCSD_CMD_BC;
+ break;
+ case MMC_CMD_BCR:
+ rc |= TIFM_MMCSD_CMD_BCR;
+ break;
+ case MMC_CMD_AC:
+ rc |= TIFM_MMCSD_CMD_AC;
+ break;
+ case MMC_CMD_ADTC:
+ rc |= TIFM_MMCSD_CMD_ADTC;
+ break;
+ default:
+ BUG();
+ }
+ return rc;
+}
+
+static void tifm_sd_exec(struct tifm_sd *host, struct mmc_command *cmd)
+{
+ struct tifm_dev *sock = host->dev;
+ unsigned int cmd_mask = tifm_sd_op_flags(cmd) |
+ (host->flags & OPENDRAIN);
+
+ if (cmd->data && (cmd->data->flags & MMC_DATA_READ))
+ cmd_mask |= TIFM_MMCSD_READ;
+
+ dev_dbg(&sock->dev, "executing opcode 0x%x, arg: 0x%x, mask: 0x%x\n",
+ cmd->opcode, cmd->arg, cmd_mask);
+
+ writel((cmd->arg >> 16) & 0xffff, sock->addr + SOCK_MMCSD_ARG_HIGH);
+ writel(cmd->arg & 0xffff, sock->addr + SOCK_MMCSD_ARG_LOW);
+ writel(cmd->opcode | cmd_mask, sock->addr + SOCK_MMCSD_COMMAND);
+}
+
+static void tifm_sd_fetch_resp(struct mmc_command *cmd, struct tifm_dev *sock)
+{
+ cmd->resp[0] = (readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x1c) << 16)
+ | readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x18);
+ cmd->resp[1] = (readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x14) << 16)
+ | readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x10);
+ cmd->resp[2] = (readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x0c) << 16)
+ | readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x08);
+ cmd->resp[3] = (readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x04) << 16)
+ | readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x00);
+}
+
+static void tifm_sd_process_cmd(struct tifm_dev *sock, struct tifm_sd *host,
+ unsigned int host_status)
+{
+ struct mmc_command *cmd = host->req->cmd;
+
+change_state:
+ switch (host->state) {
+ case IDLE:
+ return;
+ case CMD:
+ if (host_status & TIFM_MMCSD_EOC) {
+ tifm_sd_fetch_resp(cmd, sock);
+ if (cmd->data) {
+ host->state = BRS;
+ } else
+ host->state = READY;
+ goto change_state;
+ }
+ break;
+ case BRS:
+ if (tifm_sd_transfer_data(sock, host, host_status)) {
+ if (!host->req->stop) {
+ if (cmd->data->flags & MMC_DATA_WRITE) {
+ host->state = CARD;
+ } else {
+ host->state =
+ host->buffer ? READY : FIFO;
+ }
+ goto change_state;
+ }
+ tifm_sd_exec(host, host->req->stop);
+ host->state = SCMD;
+ }
+ break;
+ case SCMD:
+ if (host_status & TIFM_MMCSD_EOC) {
+ tifm_sd_fetch_resp(host->req->stop, sock);
+ if (cmd->error) {
+ host->state = READY;
+ } else if (cmd->data->flags & MMC_DATA_WRITE) {
+ host->state = CARD;
+ } else {
+ host->state = host->buffer ? READY : FIFO;
+ }
+ goto change_state;
+ }
+ break;
+ case CARD:
+ if (!(host->flags & CARD_BUSY)
+ && (host->written_blocks == cmd->data->blocks)) {
+ host->state = host->buffer ? READY : FIFO;
+ goto change_state;
+ }
+ break;
+ case FIFO:
+ if (host->flags & FIFO_RDY) {
+ host->state = READY;
+ host->flags &= ~FIFO_RDY;
+ goto change_state;
+ }
+ break;
+ case READY:
+ queue_work(sock->wq, &host->cmd_handler);
+ return;
+ }
+
+ queue_delayed_work(sock->wq, &host->abort_handler,
+ host->timeout_jiffies);
+}
+
+/* Called from interrupt handler */
+static unsigned int tifm_sd_signal_irq(struct tifm_dev *sock,
+ unsigned int sock_irq_status)
+{
+ struct tifm_sd *host;
+ unsigned int host_status = 0, fifo_status = 0;
+ int error_code = 0;
+
+ spin_lock(&sock->lock);
+ host = mmc_priv((struct mmc_host*)tifm_get_drvdata(sock));
+ cancel_delayed_work(&host->abort_handler);
+
+ if (sock_irq_status & FIFO_EVENT) {
+ fifo_status = readl(sock->addr + SOCK_DMA_FIFO_STATUS);
+ writel(fifo_status, sock->addr + SOCK_DMA_FIFO_STATUS);
+
+ host->flags |= fifo_status & FIFO_RDY;
+ }
+
+ if (sock_irq_status & CARD_EVENT) {
+ host_status = readl(sock->addr + SOCK_MMCSD_STATUS);
+ writel(host_status, sock->addr + SOCK_MMCSD_STATUS);
+
+ if (!(host->flags & HOST_REG))
+ queue_work(sock->wq, &host->cmd_handler);
+ if (!host->req)
+ goto done;
+
+ if (host_status & TIFM_MMCSD_ERRMASK) {
+ if (host_status & TIFM_MMCSD_CERR)
+ error_code = MMC_ERR_FAILED;
+ else if (host_status &
+ (TIFM_MMCSD_CTO | TIFM_MMCSD_DTO))
+ error_code = MMC_ERR_TIMEOUT;
+ else if (host_status &
+ (TIFM_MMCSD_CCRC | TIFM_MMCSD_DCRC))
+ error_code = MMC_ERR_BADCRC;
+
+ writel(TIFM_FIFO_INT_SETALL,
+ sock->addr + SOCK_DMA_FIFO_INT_ENABLE_CLEAR);
+ writel(TIFM_DMA_RESET, sock->addr + SOCK_DMA_CONTROL);
+
+ if (host->req->stop) {
+ if (host->state == SCMD) {
+ host->req->stop->error = error_code;
+ } else if(host->state == BRS) {
+ host->req->cmd->error = error_code;
+ tifm_sd_exec(host, host->req->stop);
+ queue_delayed_work(sock->wq,
+ &host->abort_handler,
+ host->timeout_jiffies);
+ host->state = SCMD;
+ goto done;
+ } else {
+ host->req->cmd->error = error_code;
+ }
+ } else {
+ host->req->cmd->error = error_code;
+ }
+ host->state = READY;
+ }
+
+ if (host_status & TIFM_MMCSD_CB)
+ host->flags |= CARD_BUSY;
+ if ((host_status & TIFM_MMCSD_EOFB) &&
+ (host->flags & CARD_BUSY)) {
+ host->written_blocks++;
+ host->flags &= ~CARD_BUSY;
+ }
+ }
+
+ if (host->req)
+ tifm_sd_process_cmd(sock, host, host_status);
+done:
+ dev_dbg(&sock->dev, "host_status %x, fifo_status %x\n",
+ host_status, fifo_status);
+ spin_unlock(&sock->lock);
+ return sock_irq_status;
+}
+
+static void tifm_sd_prepare_data(struct tifm_sd *card, struct mmc_command *cmd)
+{
+ struct tifm_dev *sock = card->dev;
+ unsigned int dest_cnt;
+
+ /* DMA style IO */
+
+ writel(TIFM_FIFO_INT_SETALL,
+ sock->addr + SOCK_DMA_FIFO_INT_ENABLE_CLEAR);
+ writel(ilog2(cmd->data->blksz) - 2,
+ sock->addr + SOCK_FIFO_PAGE_SIZE);
+ writel(TIFM_FIFO_ENABLE, sock->addr + SOCK_FIFO_CONTROL);
+ writel(TIFM_FIFO_INTMASK, sock->addr + SOCK_DMA_FIFO_INT_ENABLE_SET);
+
+ dest_cnt = (cmd->data->blocks) << 8;
+
+ writel(sg_dma_address(cmd->data->sg), sock->addr + SOCK_DMA_ADDRESS);
+
+ writel(cmd->data->blocks - 1, sock->addr + SOCK_MMCSD_NUM_BLOCKS);
+ writel(cmd->data->blksz - 1, sock->addr + SOCK_MMCSD_BLOCK_LEN);
+
+ if (cmd->data->flags & MMC_DATA_WRITE) {
+ writel(TIFM_MMCSD_TXDE, sock->addr + SOCK_MMCSD_BUFFER_CONFIG);
+ writel(dest_cnt | TIFM_DMA_TX | TIFM_DMA_EN,
+ sock->addr + SOCK_DMA_CONTROL);
+ } else {
+ writel(TIFM_MMCSD_RXDE, sock->addr + SOCK_MMCSD_BUFFER_CONFIG);
+ writel(dest_cnt | TIFM_DMA_EN, sock->addr + SOCK_DMA_CONTROL);
+ }
+}
+
+static void tifm_sd_set_data_timeout(struct tifm_sd *host,
+ struct mmc_data *data)
+{
+ struct tifm_dev *sock = host->dev;
+ unsigned int data_timeout = data->timeout_clks;
+
+ if (fixed_timeout)
+ return;
+
+ data_timeout += data->timeout_ns /
+ ((1000000000 / host->clk_freq) * host->clk_div);
+ data_timeout *= 10; // call it fudge factor for now
+
+ if (data_timeout < 0xffff) {
+ writel((~TIFM_MMCSD_DPE) &
+ readl(sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG),
+ sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG);
+ writel(data_timeout, sock->addr + SOCK_MMCSD_DATA_TO);
+ } else {
+ writel(TIFM_MMCSD_DPE |
+ readl(sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG),
+ sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG);
+ data_timeout = (data_timeout >> 10) + 1;
+ if(data_timeout > 0xffff)
+ data_timeout = 0; /* set to unlimited */
+ writel(data_timeout, sock->addr + SOCK_MMCSD_DATA_TO);
+ }
+}
+
+static void tifm_sd_request(struct mmc_host *mmc, struct mmc_request *mrq)
+{
+ struct tifm_sd *host = mmc_priv(mmc);
+ struct tifm_dev *sock = host->dev;
+ unsigned long flags;
+ int sg_count = 0;
+ struct mmc_data *r_data = mrq->cmd->data;
+
+ spin_lock_irqsave(&sock->lock, flags);
+ if (host->flags & EJECT) {
+ spin_unlock_irqrestore(&sock->lock, flags);
+ goto err_out;
+ }
+
+ if (host->req) {
+ printk(KERN_ERR DRIVER_NAME ": unfinished request detected\n");
+ spin_unlock_irqrestore(&sock->lock, flags);
+ goto err_out;
+ }
+
+ if (r_data) {
+ tifm_sd_set_data_timeout(host, r_data);
+
+ sg_count = tifm_map_sg(sock, r_data->sg, r_data->sg_len,
+ mrq->cmd->flags & MMC_DATA_WRITE
+ ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
+ if (sg_count != 1) {
+ printk(KERN_ERR DRIVER_NAME
+ ": scatterlist map failed\n");
+ spin_unlock_irqrestore(&sock->lock, flags);
+ goto err_out;
+ }
+
+ host->written_blocks = 0;
+ host->flags &= ~CARD_BUSY;
+ tifm_sd_prepare_data(host, mrq->cmd);
+ }
+
+ host->req = mrq;
+ host->state = CMD;
+ queue_delayed_work(sock->wq, &host->abort_handler,
+ host->timeout_jiffies);
+ writel(TIFM_CTRL_LED | readl(sock->addr + SOCK_CONTROL),
+ sock->addr + SOCK_CONTROL);
+ tifm_sd_exec(host, mrq->cmd);
+ spin_unlock_irqrestore(&sock->lock, flags);
+ return;
+
+err_out:
+ if (sg_count > 0)
+ tifm_unmap_sg(sock, r_data->sg, r_data->sg_len,
+ (r_data->flags & MMC_DATA_WRITE)
+ ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
+
+ mrq->cmd->error = MMC_ERR_TIMEOUT;
+ mmc_request_done(mmc, mrq);
+}
+
+static void tifm_sd_end_cmd(struct work_struct *work)
+{
+ struct tifm_sd *host = container_of(work, struct tifm_sd, cmd_handler);
+ struct tifm_dev *sock = host->dev;
+ struct mmc_host *mmc = tifm_get_drvdata(sock);
+ struct mmc_request *mrq;
+ struct mmc_data *r_data = NULL;
+ unsigned long flags;
+
+ spin_lock_irqsave(&sock->lock, flags);
+
+ mrq = host->req;
+ host->req = NULL;
+ host->state = IDLE;
+
+ if (!mrq) {
+ printk(KERN_ERR DRIVER_NAME ": no request to complete?\n");
+ spin_unlock_irqrestore(&sock->lock, flags);
+ return;
+ }
+
+ r_data = mrq->cmd->data;
+ if (r_data) {
+ if (r_data->flags & MMC_DATA_WRITE) {
+ r_data->bytes_xfered = host->written_blocks *
+ r_data->blksz;
+ } else {
+ r_data->bytes_xfered = r_data->blocks -
+ readl(sock->addr + SOCK_MMCSD_NUM_BLOCKS) - 1;
+ r_data->bytes_xfered *= r_data->blksz;
+ r_data->bytes_xfered += r_data->blksz -
+ readl(sock->addr + SOCK_MMCSD_BLOCK_LEN) + 1;
+ }
+ tifm_unmap_sg(sock, r_data->sg, r_data->sg_len,
+ (r_data->flags & MMC_DATA_WRITE)
+ ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
+ }
+
+ writel((~TIFM_CTRL_LED) & readl(sock->addr + SOCK_CONTROL),
+ sock->addr + SOCK_CONTROL);
+
+ spin_unlock_irqrestore(&sock->lock, flags);
+ mmc_request_done(mmc, mrq);
+}
+
+static void tifm_sd_request_nodma(struct mmc_host *mmc, struct mmc_request *mrq)
+{
+ struct tifm_sd *host = mmc_priv(mmc);
+ struct tifm_dev *sock = host->dev;
+ unsigned long flags;
+ struct mmc_data *r_data = mrq->cmd->data;
+ char *t_buffer = NULL;
+
+ if (r_data) {
+ t_buffer = kmap(r_data->sg->page);
+ if (!t_buffer) {
+ printk(KERN_ERR DRIVER_NAME ": kmap failed\n");
+ goto err_out;
+ }
+ }
+
+ spin_lock_irqsave(&sock->lock, flags);
+ if (host->flags & EJECT) {
+ spin_unlock_irqrestore(&sock->lock, flags);
+ goto err_out;
+ }
+
+ if (host->req) {
+ printk(KERN_ERR DRIVER_NAME ": unfinished request detected\n");
+ spin_unlock_irqrestore(&sock->lock, flags);
+ goto err_out;
+ }
+
+ if (r_data) {
+ tifm_sd_set_data_timeout(host, r_data);
+
+ host->buffer = t_buffer + r_data->sg->offset;
+ host->buffer_size = mrq->cmd->data->blocks *
+ mrq->cmd->data->blksz;
+
+ writel(TIFM_MMCSD_BUFINT |
+ readl(sock->addr + SOCK_MMCSD_INT_ENABLE),
+ sock->addr + SOCK_MMCSD_INT_ENABLE);
+ writel(((TIFM_MMCSD_FIFO_SIZE - 1) << 8) |
+ (TIFM_MMCSD_FIFO_SIZE - 1),
+ sock->addr + SOCK_MMCSD_BUFFER_CONFIG);
+
+ host->written_blocks = 0;
+ host->flags &= ~CARD_BUSY;
+ host->buffer_pos = 0;
+ writel(r_data->blocks - 1, sock->addr + SOCK_MMCSD_NUM_BLOCKS);
+ writel(r_data->blksz - 1, sock->addr + SOCK_MMCSD_BLOCK_LEN);
+ }
+
+ host->req = mrq;
+ host->state = CMD;
+ queue_delayed_work(sock->wq, &host->abort_handler,
+ host->timeout_jiffies);
+ writel(TIFM_CTRL_LED | readl(sock->addr + SOCK_CONTROL),
+ sock->addr + SOCK_CONTROL);
+ tifm_sd_exec(host, mrq->cmd);
+ spin_unlock_irqrestore(&sock->lock, flags);
+ return;
+
+err_out:
+ if (t_buffer)
+ kunmap(r_data->sg->page);
+
+ mrq->cmd->error = MMC_ERR_TIMEOUT;
+ mmc_request_done(mmc, mrq);
+}
+
+static void tifm_sd_end_cmd_nodma(struct work_struct *work)
+{
+ struct tifm_sd *host = container_of(work, struct tifm_sd, cmd_handler);
+ struct tifm_dev *sock = host->dev;
+ struct mmc_host *mmc = tifm_get_drvdata(sock);
+ struct mmc_request *mrq;
+ struct mmc_data *r_data = NULL;
+ unsigned long flags;
+
+ spin_lock_irqsave(&sock->lock, flags);
+
+ mrq = host->req;
+ host->req = NULL;
+ host->state = IDLE;
+
+ if (!mrq) {
+ printk(KERN_ERR DRIVER_NAME ": no request to complete?\n");
+ spin_unlock_irqrestore(&sock->lock, flags);
+ return;
+ }
+
+ r_data = mrq->cmd->data;
+ if (r_data) {
+ writel((~TIFM_MMCSD_BUFINT) &
+ readl(sock->addr + SOCK_MMCSD_INT_ENABLE),
+ sock->addr + SOCK_MMCSD_INT_ENABLE);
+
+ if (r_data->flags & MMC_DATA_WRITE) {
+ r_data->bytes_xfered = host->written_blocks *
+ r_data->blksz;
+ } else {
+ r_data->bytes_xfered = r_data->blocks -
+ readl(sock->addr + SOCK_MMCSD_NUM_BLOCKS) - 1;
+ r_data->bytes_xfered *= r_data->blksz;
+ r_data->bytes_xfered += r_data->blksz -
+ readl(sock->addr + SOCK_MMCSD_BLOCK_LEN) + 1;
+ }
+ host->buffer = NULL;
+ host->buffer_pos = 0;
+ host->buffer_size = 0;
+ }
+
+ writel((~TIFM_CTRL_LED) & readl(sock->addr + SOCK_CONTROL),
+ sock->addr + SOCK_CONTROL);
+
+ spin_unlock_irqrestore(&sock->lock, flags);
+
+ if (r_data)
+ kunmap(r_data->sg->page);
+
+ mmc_request_done(mmc, mrq);
+}
+
+static void tifm_sd_abort(struct work_struct *work)
+{
+ struct tifm_sd *host =
+ container_of(work, struct tifm_sd, abort_handler.work);
+
+ printk(KERN_ERR DRIVER_NAME
+ ": card failed to respond for a long period of time");
+ tifm_eject(host->dev);
+}
+
+static void tifm_sd_ios(struct mmc_host *mmc, struct mmc_ios *ios)
+{
+ struct tifm_sd *host = mmc_priv(mmc);
+ struct tifm_dev *sock = host->dev;
+ unsigned int clk_div1, clk_div2;
+ unsigned long flags;
+
+ spin_lock_irqsave(&sock->lock, flags);
+
+ dev_dbg(&sock->dev, "Setting bus width %d, power %d\n", ios->bus_width,
+ ios->power_mode);
+ if (ios->bus_width == MMC_BUS_WIDTH_4) {
+ writel(TIFM_MMCSD_4BBUS | readl(sock->addr + SOCK_MMCSD_CONFIG),
+ sock->addr + SOCK_MMCSD_CONFIG);
+ } else {
+ writel((~TIFM_MMCSD_4BBUS) &
+ readl(sock->addr + SOCK_MMCSD_CONFIG),
+ sock->addr + SOCK_MMCSD_CONFIG);
+ }
+
+ if (ios->clock) {
+ clk_div1 = 20000000 / ios->clock;
+ if (!clk_div1)
+ clk_div1 = 1;
+
+ clk_div2 = 24000000 / ios->clock;
+ if (!clk_div2)
+ clk_div2 = 1;
+
+ if ((20000000 / clk_div1) > ios->clock)
+ clk_div1++;
+ if ((24000000 / clk_div2) > ios->clock)
+ clk_div2++;
+ if ((20000000 / clk_div1) > (24000000 / clk_div2)) {
+ host->clk_freq = 20000000;
+ host->clk_div = clk_div1;
+ writel((~TIFM_CTRL_FAST_CLK) &
+ readl(sock->addr + SOCK_CONTROL),
+ sock->addr + SOCK_CONTROL);
+ } else {
+ host->clk_freq = 24000000;
+ host->clk_div = clk_div2;
+ writel(TIFM_CTRL_FAST_CLK |
+ readl(sock->addr + SOCK_CONTROL),
+ sock->addr + SOCK_CONTROL);
+ }
+ } else {
+ host->clk_div = 0;
+ }
+ host->clk_div &= TIFM_MMCSD_CLKMASK;
+ writel(host->clk_div | ((~TIFM_MMCSD_CLKMASK) &
+ readl(sock->addr + SOCK_MMCSD_CONFIG)),
+ sock->addr + SOCK_MMCSD_CONFIG);
+
+ if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN)
+ host->flags |= OPENDRAIN;
+ else
+ host->flags &= ~OPENDRAIN;
+
+ /* chip_select : maybe later */
+ //vdd
+ //power is set before probe / after remove
+ //I believe, power_off when already marked for eject is sufficient to
+ // allow removal.
+ if ((host->flags & EJECT) && ios->power_mode == MMC_POWER_OFF) {
+ host->flags |= EJECT_DONE;
+ wake_up_all(&host->can_eject);
+ }
+
+ spin_unlock_irqrestore(&sock->lock, flags);
+}
+
+static int tifm_sd_ro(struct mmc_host *mmc)
+{
+ int rc;
+ struct tifm_sd *host = mmc_priv(mmc);
+ struct tifm_dev *sock = host->dev;
+ unsigned long flags;
+
+ spin_lock_irqsave(&sock->lock, flags);
+
+ host->flags |= (CARD_RO & readl(sock->addr + SOCK_PRESENT_STATE));
+ rc = (host->flags & CARD_RO) ? 1 : 0;
+
+ spin_unlock_irqrestore(&sock->lock, flags);
+ return rc;
+}
+
+static struct mmc_host_ops tifm_sd_ops = {
+ .request = tifm_sd_request,
+ .set_ios = tifm_sd_ios,
+ .get_ro = tifm_sd_ro
+};
+
+static void tifm_sd_register_host(struct work_struct *work)
+{
+ struct tifm_sd *host = container_of(work, struct tifm_sd, cmd_handler);
+ struct tifm_dev *sock = host->dev;
+ struct mmc_host *mmc = tifm_get_drvdata(sock);
+ unsigned long flags;
+
+ spin_lock_irqsave(&sock->lock, flags);
+ host->flags |= HOST_REG;
+ PREPARE_WORK(&host->cmd_handler,
+ no_dma ? tifm_sd_end_cmd_nodma : tifm_sd_end_cmd);
+ spin_unlock_irqrestore(&sock->lock, flags);
+ dev_dbg(&sock->dev, "adding host\n");
+ mmc_add_host(mmc);
+}
+
+static int tifm_sd_probe(struct tifm_dev *sock)
+{
+ struct mmc_host *mmc;
+ struct tifm_sd *host;
+ int rc = -EIO;
+
+ if (!(TIFM_SOCK_STATE_OCCUPIED &
+ readl(sock->addr + SOCK_PRESENT_STATE))) {
+ printk(KERN_WARNING DRIVER_NAME ": card gone, unexpectedly\n");
+ return rc;
+ }
+
+ mmc = mmc_alloc_host(sizeof(struct tifm_sd), &sock->dev);
+ if (!mmc)
+ return -ENOMEM;
+
+ host = mmc_priv(mmc);
+ host->dev = sock;
+ host->clk_div = 61;
+ init_waitqueue_head(&host->can_eject);
+ INIT_WORK(&host->cmd_handler, tifm_sd_register_host);
+ INIT_DELAYED_WORK(&host->abort_handler, tifm_sd_abort);
+
+ tifm_set_drvdata(sock, mmc);
+ sock->signal_irq = tifm_sd_signal_irq;
+
+ host->clk_freq = 20000000;
+ host->timeout_jiffies = msecs_to_jiffies(1000);
+
+ tifm_sd_ops.request = no_dma ? tifm_sd_request_nodma : tifm_sd_request;
+ mmc->ops = &tifm_sd_ops;
+ mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
+ mmc->caps = MMC_CAP_4_BIT_DATA;
+ mmc->f_min = 20000000 / 60;
+ mmc->f_max = 24000000;
+ mmc->max_hw_segs = 1;
+ mmc->max_phys_segs = 1;
+ mmc->max_sectors = 127;
+ mmc->max_seg_size = mmc->max_sectors << 11; //2k maximum hw block length
+
+ writel(0, sock->addr + SOCK_MMCSD_INT_ENABLE);
+ writel(TIFM_MMCSD_RESET, sock->addr + SOCK_MMCSD_SYSTEM_CONTROL);
+ writel(host->clk_div | TIFM_MMCSD_POWER,
+ sock->addr + SOCK_MMCSD_CONFIG);
+
+ for (rc = 0; rc < 50; rc++) {
+ /* Wait for reset ack */
+ if (1 & readl(sock->addr + SOCK_MMCSD_SYSTEM_STATUS)) {
+ rc = 0;
+ break;
+ }
+ msleep(10);
+ }
+
+ if (rc) {
+ printk(KERN_ERR DRIVER_NAME
+ ": card not ready - probe failed\n");
+ mmc_free_host(mmc);
+ return -ENODEV;
+ }
+
+ writel(0, sock->addr + SOCK_MMCSD_NUM_BLOCKS);
+ writel(host->clk_div | TIFM_MMCSD_POWER,
+ sock->addr + SOCK_MMCSD_CONFIG);
+ writel(TIFM_MMCSD_RXDE, sock->addr + SOCK_MMCSD_BUFFER_CONFIG);
+ writel(TIFM_MMCSD_DATAMASK | TIFM_MMCSD_ERRMASK,
+ sock->addr + SOCK_MMCSD_INT_ENABLE);
+
+ writel(64, sock->addr + SOCK_MMCSD_COMMAND_TO); // command timeout 64 clocks for now
+ writel(TIFM_MMCSD_INAB, sock->addr + SOCK_MMCSD_COMMAND);
+ writel(host->clk_div | TIFM_MMCSD_POWER,
+ sock->addr + SOCK_MMCSD_CONFIG);
+
+ queue_delayed_work(sock->wq, &host->abort_handler,
+ host->timeout_jiffies);
+
+ return 0;
+}
+
+static int tifm_sd_host_is_down(struct tifm_dev *sock)
+{
+ struct mmc_host *mmc = tifm_get_drvdata(sock);
+ struct tifm_sd *host = mmc_priv(mmc);
+ unsigned long flags;
+ int rc = 0;
+
+ spin_lock_irqsave(&sock->lock, flags);
+ rc = (host->flags & EJECT_DONE);
+ spin_unlock_irqrestore(&sock->lock, flags);
+ return rc;
+}
+
+static void tifm_sd_remove(struct tifm_dev *sock)
+{
+ struct mmc_host *mmc = tifm_get_drvdata(sock);
+ struct tifm_sd *host = mmc_priv(mmc);
+ unsigned long flags;
+
+ spin_lock_irqsave(&sock->lock, flags);
+ host->flags |= EJECT;
+ if (host->req)
+ queue_work(sock->wq, &host->cmd_handler);
+ spin_unlock_irqrestore(&sock->lock, flags);
+ wait_event_timeout(host->can_eject, tifm_sd_host_is_down(sock),
+ host->timeout_jiffies);
+
+ if (host->flags & HOST_REG)
+ mmc_remove_host(mmc);
+
+ /* The meaning of the bit majority in this constant is unknown. */
+ writel(0xfff8 & readl(sock->addr + SOCK_CONTROL),
+ sock->addr + SOCK_CONTROL);
+ writel(0, sock->addr + SOCK_MMCSD_INT_ENABLE);
+ writel(TIFM_FIFO_INT_SETALL,
+ sock->addr + SOCK_DMA_FIFO_INT_ENABLE_CLEAR);
+ writel(0, sock->addr + SOCK_DMA_FIFO_INT_ENABLE_SET);
+
+ tifm_set_drvdata(sock, NULL);
+ mmc_free_host(mmc);
+}
+
+static tifm_media_id tifm_sd_id_tbl[] = {
+ FM_SD, 0
+};
+
+static struct tifm_driver tifm_sd_driver = {
+ .driver = {
+ .name = DRIVER_NAME,
+ .owner = THIS_MODULE
+ },
+ .id_table = tifm_sd_id_tbl,
+ .probe = tifm_sd_probe,
+ .remove = tifm_sd_remove
+};
+
+static int __init tifm_sd_init(void)
+{
+ return tifm_register_driver(&tifm_sd_driver);
+}
+
+static void __exit tifm_sd_exit(void)
+{
+ tifm_unregister_driver(&tifm_sd_driver);
+}
+
+MODULE_AUTHOR("Alex Dubov");
+MODULE_DESCRIPTION("TI FlashMedia SD driver");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(tifm, tifm_sd_id_tbl);
+MODULE_VERSION(DRIVER_VERSION);
+
+module_init(tifm_sd_init);
+module_exit(tifm_sd_exit);
git://git.onelab.eu / linux-2.6.git / blobdiff