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linux/drivers/mmc/host/tifm_sd.c
Gustavo A. R. Silva df561f6688 treewide: Use fallthrough pseudo-keyword 
Replace the existing /* fall through */ comments and its variants with
the new pseudo-keyword macro fallthrough[1]. Also, remove unnecessary
fall-through markings when it is the case.

[1] https://www.kernel.org/doc/html/v5.7/process/deprecated.html?highlight=fallthrough#implicit-switch-case-fall-through

Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
2020-08-23 17:36:59 -05:00

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// SPDX-License-Identifier: GPL-2.0-only
/*
* tifm_sd.c - TI FlashMedia driver
*
* Copyright (C) 2006 Alex Dubov <oakad@yahoo.com>
*
* Special thanks to Brad Campbell for extensive testing of this driver.
*/
#include <linux/tifm.h>
#include <linux/mmc/host.h>
#include <linux/highmem.h>
#include <linux/scatterlist.h>
#include <linux/module.h>
#include <asm/io.h>
#define DRIVER_NAME "tifm_sd"
#define DRIVER_VERSION "0.8"
static bool no_dma = 0;
static bool 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_ERRMASK 0x01e0 /* set bits: CCRC, CTO, DCRC, DTO */
#define TIFM_MMCSD_EOC 0x0001 /* end of command phase */
#define TIFM_MMCSD_CD 0x0002 /* card detect */
#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_OCRB 0x1000 /* OCR busy */
#define TIFM_MMCSD_CIRQ 0x2000 /* card irq (cmd40/sdio) */
#define TIFM_MMCSD_CERR 0x4000 /* card status error */
#define TIFM_MMCSD_ODTO 0x0040 /* open drain / extended timeout */
#define TIFM_MMCSD_CARD_RO 0x0200 /* card is read-only */
#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
#define TIFM_MMCSD_MAX_BLOCK_SIZE 0x0800UL
#define TIFM_MMCSD_REQ_TIMEOUT_MS 1000
enum {
CMD_READY = 0x0001,
FIFO_READY = 0x0002,
BRS_READY = 0x0004,
SCMD_ACTIVE = 0x0008,
SCMD_READY = 0x0010,
CARD_BUSY = 0x0020,
DATA_CARRY = 0x0040
};
struct tifm_sd {
struct tifm_dev *dev;
unsigned short eject:1,
open_drain:1,
no_dma:1;
unsigned short cmd_flags;
unsigned int clk_freq;
unsigned int clk_div;
unsigned long timeout_jiffies;
struct tasklet_struct finish_tasklet;
struct timer_list timer;
struct mmc_request *req;
int sg_len;
int sg_pos;
unsigned int block_pos;
struct scatterlist bounce_buf;
unsigned char bounce_buf_data[TIFM_MMCSD_MAX_BLOCK_SIZE];
};
/* for some reason, host won't respond correctly to readw/writew */
static void tifm_sd_read_fifo(struct tifm_sd *host, struct page *pg,
unsigned int off, unsigned int cnt)
{
struct tifm_dev *sock = host->dev;
unsigned char *buf;
unsigned int pos = 0, val;
buf = kmap_atomic(pg) + off;
if (host->cmd_flags & DATA_CARRY) {
buf[pos++] = host->bounce_buf_data[0];
host->cmd_flags &= ~DATA_CARRY;
}
while (pos < cnt) {
val = readl(sock->addr + SOCK_MMCSD_DATA);
buf[pos++] = val & 0xff;
if (pos == cnt) {
host->bounce_buf_data[0] = (val >> 8) & 0xff;
host->cmd_flags |= DATA_CARRY;
break;
}
buf[pos++] = (val >> 8) & 0xff;
}
kunmap_atomic(buf - off);
}
static void tifm_sd_write_fifo(struct tifm_sd *host, struct page *pg,
unsigned int off, unsigned int cnt)
{
struct tifm_dev *sock = host->dev;
unsigned char *buf;
unsigned int pos = 0, val;
buf = kmap_atomic(pg) + off;
if (host->cmd_flags & DATA_CARRY) {
val = host->bounce_buf_data[0] | ((buf[pos++] << 8) & 0xff00);
writel(val, sock->addr + SOCK_MMCSD_DATA);
host->cmd_flags &= ~DATA_CARRY;
}
while (pos < cnt) {
val = buf[pos++];
if (pos == cnt) {
host->bounce_buf_data[0] = val & 0xff;
host->cmd_flags |= DATA_CARRY;
break;
}
val |= (buf[pos++] << 8) & 0xff00;
writel(val, sock->addr + SOCK_MMCSD_DATA);
}
kunmap_atomic(buf - off);
}
static void tifm_sd_transfer_data(struct tifm_sd *host)
{
struct mmc_data *r_data = host->req->cmd->data;
struct scatterlist *sg = r_data->sg;
unsigned int off, cnt, t_size = TIFM_MMCSD_FIFO_SIZE * 2;
unsigned int p_off, p_cnt;
struct page *pg;
if (host->sg_pos == host->sg_len)
return;
while (t_size) {
cnt = sg[host->sg_pos].length - host->block_pos;
if (!cnt) {
host->block_pos = 0;
host->sg_pos++;
if (host->sg_pos == host->sg_len) {
if ((r_data->flags & MMC_DATA_WRITE)
&& (host->cmd_flags & DATA_CARRY))
writel(host->bounce_buf_data[0],
host->dev->addr
+ SOCK_MMCSD_DATA);
return;
}
cnt = sg[host->sg_pos].length;
}
off = sg[host->sg_pos].offset + host->block_pos;
pg = nth_page(sg_page(&sg[host->sg_pos]), off >> PAGE_SHIFT);
p_off = offset_in_page(off);
p_cnt = PAGE_SIZE - p_off;
p_cnt = min(p_cnt, cnt);
p_cnt = min(p_cnt, t_size);
if (r_data->flags & MMC_DATA_READ)
tifm_sd_read_fifo(host, pg, p_off, p_cnt);
else if (r_data->flags & MMC_DATA_WRITE)
tifm_sd_write_fifo(host, pg, p_off, p_cnt);
t_size -= p_cnt;
host->block_pos += p_cnt;
}
}
static void tifm_sd_copy_page(struct page *dst, unsigned int dst_off,
struct page *src, unsigned int src_off,
unsigned int count)
{
unsigned char *src_buf = kmap_atomic(src) + src_off;
unsigned char *dst_buf = kmap_atomic(dst) + dst_off;
memcpy(dst_buf, src_buf, count);
kunmap_atomic(dst_buf - dst_off);
kunmap_atomic(src_buf - src_off);
}
static void tifm_sd_bounce_block(struct tifm_sd *host, struct mmc_data *r_data)
{
struct scatterlist *sg = r_data->sg;
unsigned int t_size = r_data->blksz;
unsigned int off, cnt;
unsigned int p_off, p_cnt;
struct page *pg;
dev_dbg(&host->dev->dev, "bouncing block\n");
while (t_size) {
cnt = sg[host->sg_pos].length - host->block_pos;
if (!cnt) {
host->block_pos = 0;
host->sg_pos++;
if (host->sg_pos == host->sg_len)
return;
cnt = sg[host->sg_pos].length;
}
off = sg[host->sg_pos].offset + host->block_pos;
pg = nth_page(sg_page(&sg[host->sg_pos]), off >> PAGE_SHIFT);
p_off = offset_in_page(off);
p_cnt = PAGE_SIZE - p_off;
p_cnt = min(p_cnt, cnt);
p_cnt = min(p_cnt, t_size);
if (r_data->flags & MMC_DATA_WRITE)
tifm_sd_copy_page(sg_page(&host->bounce_buf),
r_data->blksz - t_size,
pg, p_off, p_cnt);
else if (r_data->flags & MMC_DATA_READ)
tifm_sd_copy_page(pg, p_off, sg_page(&host->bounce_buf),
r_data->blksz - t_size, p_cnt);
t_size -= p_cnt;
host->block_pos += p_cnt;
}
}
static int tifm_sd_set_dma_data(struct tifm_sd *host, struct mmc_data *r_data)
{
struct tifm_dev *sock = host->dev;
unsigned int t_size = TIFM_DMA_TSIZE * r_data->blksz;
unsigned int dma_len, dma_blk_cnt, dma_off;
struct scatterlist *sg = NULL;
unsigned long flags;
if (host->sg_pos == host->sg_len)
return 1;
if (host->cmd_flags & DATA_CARRY) {
host->cmd_flags &= ~DATA_CARRY;
local_irq_save(flags);
tifm_sd_bounce_block(host, r_data);
local_irq_restore(flags);
if (host->sg_pos == host->sg_len)
return 1;
}
dma_len = sg_dma_len(&r_data->sg[host->sg_pos]) - host->block_pos;
if (!dma_len) {
host->block_pos = 0;
host->sg_pos++;
if (host->sg_pos == host->sg_len)
return 1;
dma_len = sg_dma_len(&r_data->sg[host->sg_pos]);
}
if (dma_len < t_size) {
dma_blk_cnt = dma_len / r_data->blksz;
dma_off = host->block_pos;
host->block_pos += dma_blk_cnt * r_data->blksz;
} else {
dma_blk_cnt = TIFM_DMA_TSIZE;
dma_off = host->block_pos;
host->block_pos += t_size;
}
if (dma_blk_cnt)
sg = &r_data->sg[host->sg_pos];
else if (dma_len) {
if (r_data->flags & MMC_DATA_WRITE) {
local_irq_save(flags);
tifm_sd_bounce_block(host, r_data);
local_irq_restore(flags);
} else
host->cmd_flags |= DATA_CARRY;
sg = &host->bounce_buf;
dma_off = 0;
dma_blk_cnt = 1;
} else
return 1;
dev_dbg(&sock->dev, "setting dma for %d blocks\n", dma_blk_cnt);
writel(sg_dma_address(sg) + dma_off, sock->addr + SOCK_DMA_ADDRESS);
if (r_data->flags & MMC_DATA_WRITE)
writel((dma_blk_cnt << 8) | TIFM_DMA_TX | TIFM_DMA_EN,
sock->addr + SOCK_DMA_CONTROL);
else
writel((dma_blk_cnt << 8) | TIFM_DMA_EN,
sock->addr + SOCK_DMA_CONTROL);
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;
fallthrough;
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);
if (host->open_drain)
cmd_mask |= TIFM_MMCSD_ODTO;
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_check_status(struct tifm_sd *host)
{
struct tifm_dev *sock = host->dev;
struct mmc_command *cmd = host->req->cmd;
if (cmd->error)
goto finish_request;
if (!(host->cmd_flags & CMD_READY))
return;
if (cmd->data) {
if (cmd->data->error) {
if ((host->cmd_flags & SCMD_ACTIVE)
&& !(host->cmd_flags & SCMD_READY))
return;
goto finish_request;
}
if (!(host->cmd_flags & BRS_READY))
return;
if (!(host->no_dma || (host->cmd_flags & FIFO_READY)))
return;
if (cmd->data->flags & MMC_DATA_WRITE) {
if (host->req->stop) {
if (!(host->cmd_flags & SCMD_ACTIVE)) {
host->cmd_flags |= SCMD_ACTIVE;
writel(TIFM_MMCSD_EOFB
| readl(sock->addr
+ SOCK_MMCSD_INT_ENABLE),
sock->addr
+ SOCK_MMCSD_INT_ENABLE);
tifm_sd_exec(host, host->req->stop);
return;
} else {
if (!(host->cmd_flags & SCMD_READY)
|| (host->cmd_flags & CARD_BUSY))
return;
writel((~TIFM_MMCSD_EOFB)
& readl(sock->addr
+ SOCK_MMCSD_INT_ENABLE),
sock->addr
+ SOCK_MMCSD_INT_ENABLE);
}
} else {
if (host->cmd_flags & CARD_BUSY)
return;
writel((~TIFM_MMCSD_EOFB)
& readl(sock->addr
+ SOCK_MMCSD_INT_ENABLE),
sock->addr + SOCK_MMCSD_INT_ENABLE);
}
} else {
if (host->req->stop) {
if (!(host->cmd_flags & SCMD_ACTIVE)) {
host->cmd_flags |= SCMD_ACTIVE;
tifm_sd_exec(host, host->req->stop);
return;
} else {
if (!(host->cmd_flags & SCMD_READY))
return;
}
}
}
}
finish_request:
tasklet_schedule(&host->finish_tasklet);
}
/* Called from interrupt handler */
static void tifm_sd_data_event(struct tifm_dev *sock)
{
struct tifm_sd *host;
unsigned int fifo_status = 0;
struct mmc_data *r_data = NULL;
spin_lock(&sock->lock);
host = mmc_priv((struct mmc_host*)tifm_get_drvdata(sock));
fifo_status = readl(sock->addr + SOCK_DMA_FIFO_STATUS);
dev_dbg(&sock->dev, "data event: fifo_status %x, flags %x\n",
fifo_status, host->cmd_flags);
if (host->req) {
r_data = host->req->cmd->data;
if (r_data && (fifo_status & TIFM_FIFO_READY)) {
if (tifm_sd_set_dma_data(host, r_data)) {
host->cmd_flags |= FIFO_READY;
tifm_sd_check_status(host);
}
}
}
writel(fifo_status, sock->addr + SOCK_DMA_FIFO_STATUS);
spin_unlock(&sock->lock);
}
/* Called from interrupt handler */
static void tifm_sd_card_event(struct tifm_dev *sock)
{
struct tifm_sd *host;
unsigned int host_status = 0;
int cmd_error = 0;
struct mmc_command *cmd = NULL;
unsigned long flags;
spin_lock(&sock->lock);
host = mmc_priv((struct mmc_host*)tifm_get_drvdata(sock));
host_status = readl(sock->addr + SOCK_MMCSD_STATUS);
dev_dbg(&sock->dev, "host event: host_status %x, flags %x\n",
host_status, host->cmd_flags);
if (host->req) {
cmd = host->req->cmd;
if (host_status & TIFM_MMCSD_ERRMASK) {
writel(host_status & TIFM_MMCSD_ERRMASK,
sock->addr + SOCK_MMCSD_STATUS);
if (host_status & TIFM_MMCSD_CTO)
cmd_error = -ETIMEDOUT;
else if (host_status & TIFM_MMCSD_CCRC)
cmd_error = -EILSEQ;
if (cmd->data) {
if (host_status & TIFM_MMCSD_DTO)
cmd->data->error = -ETIMEDOUT;
else if (host_status & TIFM_MMCSD_DCRC)
cmd->data->error = -EILSEQ;
}
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->cmd_flags & SCMD_ACTIVE) {
host->req->stop->error = cmd_error;
host->cmd_flags |= SCMD_READY;
} else {
cmd->error = cmd_error;
host->cmd_flags |= SCMD_ACTIVE;
tifm_sd_exec(host, host->req->stop);
goto done;
}
} else
cmd->error = cmd_error;
} else {
if (host_status & (TIFM_MMCSD_EOC | TIFM_MMCSD_CERR)) {
if (!(host->cmd_flags & CMD_READY)) {
host->cmd_flags |= CMD_READY;
tifm_sd_fetch_resp(cmd, sock);
} else if (host->cmd_flags & SCMD_ACTIVE) {
host->cmd_flags |= SCMD_READY;
tifm_sd_fetch_resp(host->req->stop,
sock);
}
}
if (host_status & TIFM_MMCSD_BRS)
host->cmd_flags |= BRS_READY;
}
if (host->no_dma && cmd->data) {
if (host_status & TIFM_MMCSD_AE)
writel(host_status & TIFM_MMCSD_AE,
sock->addr + SOCK_MMCSD_STATUS);
if (host_status & (TIFM_MMCSD_AE | TIFM_MMCSD_AF
| TIFM_MMCSD_BRS)) {
local_irq_save(flags);
tifm_sd_transfer_data(host);
local_irq_restore(flags);
host_status &= ~TIFM_MMCSD_AE;
}
}
if (host_status & TIFM_MMCSD_EOFB)
host->cmd_flags &= ~CARD_BUSY;
else if (host_status & TIFM_MMCSD_CB)
host->cmd_flags |= CARD_BUSY;
tifm_sd_check_status(host);
}
done:
writel(host_status, sock->addr + SOCK_MMCSD_STATUS);
spin_unlock(&sock->lock);
}
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 /
((1000000000UL / host->clk_freq) * host->clk_div);
if (data_timeout < 0xffff) {
writel(data_timeout, sock->addr + SOCK_MMCSD_DATA_TO);
writel((~TIFM_MMCSD_DPE)
& readl(sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG),
sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG);
} else {
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);
writel(TIFM_MMCSD_DPE
| readl(sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG),
sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG);
}
}
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;
struct mmc_data *r_data = mrq->cmd->data;
spin_lock_irqsave(&sock->lock, flags);
if (host->eject) {
mrq->cmd->error = -ENOMEDIUM;
goto err_out;
}
if (host->req) {
pr_err("%s : unfinished request detected\n",
dev_name(&sock->dev));
mrq->cmd->error = -ETIMEDOUT;
goto err_out;
}
host->cmd_flags = 0;
host->block_pos = 0;
host->sg_pos = 0;
if (mrq->data && !is_power_of_2(mrq->data->blksz))
host->no_dma = 1;
else
host->no_dma = no_dma ? 1 : 0;
if (r_data) {
tifm_sd_set_data_timeout(host, r_data);
if ((r_data->flags & MMC_DATA_WRITE) && !mrq->stop)
writel(TIFM_MMCSD_EOFB
| readl(sock->addr + SOCK_MMCSD_INT_ENABLE),
sock->addr + SOCK_MMCSD_INT_ENABLE);
if (host->no_dma) {
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->sg_len = r_data->sg_len;
} else {
sg_init_one(&host->bounce_buf, host->bounce_buf_data,
r_data->blksz);
if(1 != tifm_map_sg(sock, &host->bounce_buf, 1,
r_data->flags & MMC_DATA_WRITE
? PCI_DMA_TODEVICE
: PCI_DMA_FROMDEVICE)) {
pr_err("%s : scatterlist map failed\n",
dev_name(&sock->dev));
mrq->cmd->error = -ENOMEM;
goto err_out;
}
host->sg_len = tifm_map_sg(sock, r_data->sg,
r_data->sg_len,
r_data->flags
& MMC_DATA_WRITE
? PCI_DMA_TODEVICE
: PCI_DMA_FROMDEVICE);
if (host->sg_len < 1) {
pr_err("%s : scatterlist map failed\n",
dev_name(&sock->dev));
tifm_unmap_sg(sock, &host->bounce_buf, 1,
r_data->flags & MMC_DATA_WRITE
? PCI_DMA_TODEVICE
: PCI_DMA_FROMDEVICE);
mrq->cmd->error = -ENOMEM;
goto err_out;
}
writel(TIFM_FIFO_INT_SETALL,
sock->addr + SOCK_DMA_FIFO_INT_ENABLE_CLEAR);
writel(ilog2(r_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);
if (r_data->flags & MMC_DATA_WRITE)
writel(TIFM_MMCSD_TXDE,
sock->addr + SOCK_MMCSD_BUFFER_CONFIG);
else
writel(TIFM_MMCSD_RXDE,
sock->addr + SOCK_MMCSD_BUFFER_CONFIG);
tifm_sd_set_dma_data(host, r_data);
}
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;
mod_timer(&host->timer, jiffies + 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:
spin_unlock_irqrestore(&sock->lock, flags);
mmc_request_done(mmc, mrq);
}
static void tifm_sd_end_cmd(unsigned long 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);
del_timer(&host->timer);
mrq = host->req;
host->req = NULL;
if (!mrq) {
pr_err(" %s : no request to complete?\n",
dev_name(&sock->dev));
spin_unlock_irqrestore(&sock->lock, flags);
return;
}
r_data = mrq->cmd->data;
if (r_data) {
if (host->no_dma) {
writel((~TIFM_MMCSD_BUFINT)
& readl(sock->addr + SOCK_MMCSD_INT_ENABLE),
sock->addr + SOCK_MMCSD_INT_ENABLE);
} else {
tifm_unmap_sg(sock, &host->bounce_buf, 1,
(r_data->flags & MMC_DATA_WRITE)
? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
tifm_unmap_sg(sock, r_data->sg, r_data->sg_len,
(r_data->flags & MMC_DATA_WRITE)
? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
}
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;
}
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_abort(struct timer_list *t)
{
struct tifm_sd *host = from_timer(host, t, timer);
pr_err("%s : card failed to respond for a long period of time "
"(%x, %x)\n",
dev_name(&host->dev->dev), host->req->cmd->opcode, host->cmd_flags);
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, "ios: clock = %u, vdd = %x, bus_mode = %x, "
"chip_select = %x, power_mode = %x, bus_width = %x\n",
ios->clock, ios->vdd, ios->bus_mode, ios->chip_select,
ios->power_mode, ios->bus_width);
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);
host->open_drain = (ios->bus_mode == MMC_BUSMODE_OPENDRAIN);
/* chip_select : maybe later */
//vdd
//power is set before probe / after remove
spin_unlock_irqrestore(&sock->lock, flags);
}
static int tifm_sd_ro(struct mmc_host *mmc)
{
int rc = 0;
struct tifm_sd *host = mmc_priv(mmc);
struct tifm_dev *sock = host->dev;
unsigned long flags;
spin_lock_irqsave(&sock->lock, flags);
if (TIFM_MMCSD_CARD_RO & readl(sock->addr + SOCK_PRESENT_STATE))
rc = 1;
spin_unlock_irqrestore(&sock->lock, flags);
return rc;
}
static const struct mmc_host_ops tifm_sd_ops = {
.request = tifm_sd_request,
.set_ios = tifm_sd_ios,
.get_ro = tifm_sd_ro
};
static int tifm_sd_initialize_host(struct tifm_sd *host)
{
int rc;
unsigned int host_status = 0;
struct tifm_dev *sock = host->dev;
writel(0, sock->addr + SOCK_MMCSD_INT_ENABLE);
host->clk_div = 61;
host->clk_freq = 20000000;
writel(TIFM_MMCSD_RESET, sock->addr + SOCK_MMCSD_SYSTEM_CONTROL);
writel(host->clk_div | TIFM_MMCSD_POWER,
sock->addr + SOCK_MMCSD_CONFIG);
/* wait up to 0.51 sec for reset */
for (rc = 32; rc <= 256; rc <<= 1) {
if (1 & readl(sock->addr + SOCK_MMCSD_SYSTEM_STATUS)) {
rc = 0;
break;
}
msleep(rc);
}
if (rc) {
pr_err("%s : controller failed to reset\n",
dev_name(&sock->dev));
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);
// command timeout fixed to 64 clocks for now
writel(64, sock->addr + SOCK_MMCSD_COMMAND_TO);
writel(TIFM_MMCSD_INAB, sock->addr + SOCK_MMCSD_COMMAND);
for (rc = 16; rc <= 64; rc <<= 1) {
host_status = readl(sock->addr + SOCK_MMCSD_STATUS);
writel(host_status, sock->addr + SOCK_MMCSD_STATUS);
if (!(host_status & TIFM_MMCSD_ERRMASK)
&& (host_status & TIFM_MMCSD_EOC)) {
rc = 0;
break;
}
msleep(rc);
}
if (rc) {
pr_err("%s : card not ready - probe failed on initialization\n",
dev_name(&sock->dev));
return -ENODEV;
}
writel(TIFM_MMCSD_CERR | TIFM_MMCSD_BRS | TIFM_MMCSD_EOC
| TIFM_MMCSD_ERRMASK,
sock->addr + SOCK_MMCSD_INT_ENABLE);
return 0;
}
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))) {
pr_warn("%s : card gone, unexpectedly\n",
dev_name(&sock->dev));
return rc;
}
mmc = mmc_alloc_host(sizeof(struct tifm_sd), &sock->dev);
if (!mmc)
return -ENOMEM;
host = mmc_priv(mmc);
tifm_set_drvdata(sock, mmc);
host->dev = sock;
host->timeout_jiffies = msecs_to_jiffies(TIFM_MMCSD_REQ_TIMEOUT_MS);
/*
* We use a fixed request timeout of 1s, hence inform the core about it.
* A future improvement should instead respect the cmd->busy_timeout.
*/
mmc->max_busy_timeout = TIFM_MMCSD_REQ_TIMEOUT_MS;
tasklet_init(&host->finish_tasklet, tifm_sd_end_cmd,
(unsigned long)host);
timer_setup(&host->timer, tifm_sd_abort, 0);
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_blk_count = 2048;
mmc->max_segs = mmc->max_blk_count;
mmc->max_blk_size = min(TIFM_MMCSD_MAX_BLOCK_SIZE, PAGE_SIZE);
mmc->max_seg_size = mmc->max_blk_count * mmc->max_blk_size;
mmc->max_req_size = mmc->max_seg_size;
sock->card_event = tifm_sd_card_event;
sock->data_event = tifm_sd_data_event;
rc = tifm_sd_initialize_host(host);
if (!rc)
rc = mmc_add_host(mmc);
if (!rc)
return 0;
mmc_free_host(mmc);
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->eject = 1;
writel(0, sock->addr + SOCK_MMCSD_INT_ENABLE);
spin_unlock_irqrestore(&sock->lock, flags);
tasklet_kill(&host->finish_tasklet);
spin_lock_irqsave(&sock->lock, flags);
if (host->req) {
writel(TIFM_FIFO_INT_SETALL,
sock->addr + SOCK_DMA_FIFO_INT_ENABLE_CLEAR);
writel(0, sock->addr + SOCK_DMA_FIFO_INT_ENABLE_SET);
host->req->cmd->error = -ENOMEDIUM;
if (host->req->stop)
host->req->stop->error = -ENOMEDIUM;
tasklet_schedule(&host->finish_tasklet);
}
spin_unlock_irqrestore(&sock->lock, flags);
mmc_remove_host(mmc);
dev_dbg(&sock->dev, "after remove\n");
mmc_free_host(mmc);
}
#ifdef CONFIG_PM
static int tifm_sd_suspend(struct tifm_dev *sock, pm_message_t state)
{
return 0;
}
static int tifm_sd_resume(struct tifm_dev *sock)
{
struct mmc_host *mmc = tifm_get_drvdata(sock);
struct tifm_sd *host = mmc_priv(mmc);
int rc;
rc = tifm_sd_initialize_host(host);
dev_dbg(&sock->dev, "resume initialize %d\n", rc);
if (rc)
host->eject = 1;
return rc;
}
#else
#define tifm_sd_suspend NULL
#define tifm_sd_resume NULL
#endif /* CONFIG_PM */
static struct tifm_device_id tifm_sd_id_tbl[] = {
{ TIFM_TYPE_SD }, { }
};
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,
.suspend = tifm_sd_suspend,
.resume = tifm_sd_resume
};
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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