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OpenCloudOS-Kernel/drivers/mmc/tifm_sd.c

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/*
* 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 work_struct 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;
case MMC_RSP_R6:
rc |= TIFM_MMCSD_RSP_R6;
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(long_log2(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(void *data)
{
struct tifm_sd *host = data;
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(void *data)
{
struct tifm_sd *host = (struct tifm_sd*)data;
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(void *data)
{
printk(KERN_ERR DRIVER_NAME
": card failed to respond for a long period of time");
tifm_eject(((struct tifm_sd*)data)->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(void *data)
{
struct tifm_sd *host = (struct tifm_sd*)data;
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,
data);
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, host);
INIT_WORK(&host->abort_handler, tifm_sd_abort, host);
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);
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