- 根目录:
- drivers
- memstick
- host
- tifm_ms.c
/*
* TI FlashMedia driver
*
* Copyright (C) 2007 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.
*
* Special thanks to Carlos Corbacho for providing various MemoryStick cards
* that made this driver possible.
*
*/
#include <linux/tifm.h>
#include <linux/memstick.h>
#include <linux/highmem.h>
#include <linux/scatterlist.h>
#include <linux/log2.h>
#include <asm/io.h>
#define DRIVER_NAME "tifm_ms"
static int no_dma;
module_param(no_dma, bool, 0644);
/*
* Some control bits of TIFM appear to conform to Sony's reference design,
* so I'm just assuming they all are.
*/
#define TIFM_MS_STAT_DRQ 0x04000
#define TIFM_MS_STAT_MSINT 0x02000
#define TIFM_MS_STAT_RDY 0x01000
#define TIFM_MS_STAT_CRC 0x00200
#define TIFM_MS_STAT_TOE 0x00100
#define TIFM_MS_STAT_EMP 0x00020
#define TIFM_MS_STAT_FUL 0x00010
#define TIFM_MS_STAT_CED 0x00008
#define TIFM_MS_STAT_ERR 0x00004
#define TIFM_MS_STAT_BRQ 0x00002
#define TIFM_MS_STAT_CNK 0x00001
#define TIFM_MS_SYS_DMA 0x10000
#define TIFM_MS_SYS_RESET 0x08000
#define TIFM_MS_SYS_SRAC 0x04000
#define TIFM_MS_SYS_INTEN 0x02000
#define TIFM_MS_SYS_NOCRC 0x01000
#define TIFM_MS_SYS_INTCLR 0x00800
#define TIFM_MS_SYS_MSIEN 0x00400
#define TIFM_MS_SYS_FCLR 0x00200
#define TIFM_MS_SYS_FDIR 0x00100
#define TIFM_MS_SYS_DAM 0x00080
#define TIFM_MS_SYS_DRM 0x00040
#define TIFM_MS_SYS_DRQSL 0x00020
#define TIFM_MS_SYS_REI 0x00010
#define TIFM_MS_SYS_REO 0x00008
#define TIFM_MS_SYS_BSY_MASK 0x00007
#define TIFM_MS_SYS_FIFO (TIFM_MS_SYS_INTEN | TIFM_MS_SYS_MSIEN \
| TIFM_MS_SYS_FCLR | TIFM_MS_SYS_BSY_MASK)
/* Hardware flags */
enum {
CMD_READY = 0x01,
FIFO_READY = 0x02,
CARD_INT = 0x04
};
struct tifm_ms {
struct tifm_dev *dev;
struct timer_list timer;
struct memstick_request *req;
struct tasklet_struct notify;
unsigned int mode_mask;
unsigned int block_pos;
unsigned long timeout_jiffies;
unsigned char eject:1,
use_dma:1;
unsigned char cmd_flags;
unsigned char io_pos;
unsigned int io_word;
};
static unsigned int tifm_ms_read_data(struct tifm_ms *host,
unsigned char *buf, unsigned int length)
{
struct tifm_dev *sock = host->dev;
unsigned int off = 0;
while (host->io_pos && length) {
buf[off++] = host->io_word & 0xff;
host->io_word >>= 8;
length--;
host->io_pos--;
}
if (!length)
return off;
while (!(TIFM_MS_STAT_EMP & readl(sock->addr + SOCK_MS_STATUS))) {
if (length < 4)
break;
*(unsigned int *)(buf + off) = __raw_readl(sock->addr
+ SOCK_MS_DATA);
length -= 4;
off += 4;
}
if (length
&& !(TIFM_MS_STAT_EMP & readl(sock->addr + SOCK_MS_STATUS))) {
host->io_word = readl(sock->addr + SOCK_MS_DATA);
for (host->io_pos = 4; host->io_pos; --host->io_pos) {
buf[off++] = host->io_word & 0xff;
host->io_word >>= 8;
length--;
if (!length)
break;
}
}
return off;
}
static unsigned int tifm_ms_write_data(struct tifm_ms *host,
unsigned char *buf, unsigned int length)
{
struct tifm_dev *sock = host->dev;
unsigned int off = 0;
if (host->io_pos) {
while (host->io_pos < 4 && length) {
host->io_word |= buf[off++] << (host->io_pos * 8);
host->io_pos++;
length--;
}
}
if (host->io_pos == 4
&& !(TIFM_MS_STAT_FUL & readl(sock->addr + SOCK_MS_STATUS))) {
writel(TIFM_MS_SYS_FDIR | readl(sock->addr + SOCK_MS_SYSTEM),
sock->addr + SOCK_MS_SYSTEM);
writel(host->io_word, sock->addr + SOCK_MS_DATA);
host->io_pos = 0;
host->io_word = 0;
} else if (host->io_pos) {
return off;
}
if (!length)
return off;
while (!(TIFM_MS_STAT_FUL & readl(sock->addr + SOCK_MS_STATUS))) {
if (length < 4)
break;
writel(TIFM_MS_SYS_FDIR | readl(sock->addr + SOCK_MS_SYSTEM),
sock->addr + SOCK_MS_SYSTEM);
__raw_writel(*(unsigned int *)(buf + off),
sock->addr + SOCK_MS_DATA);
length -= 4;
off += 4;
}
switch (length) {
case 3:
host->io_word |= buf[off + 2] << 16;
host->io_pos++;
case 2:
host->io_word |= buf[off + 1] << 8;
host->io_pos++;
case 1:
host->io_word |= buf[off];
host->io_pos++;
}
off += host->io_pos;
return off;
}
static unsigned int tifm_ms_transfer_data(struct tifm_ms *host)
{
struct tifm_dev *sock = host->dev;
unsigned int length;
unsigned int off;
unsigned int t_size, p_cnt;
unsigned char *buf;
struct page *pg;
unsigned long flags = 0;
if (host->req->long_data) {
length = host->req->sg.length - host->block_pos;
off = host->req->sg.offset + host->block_pos;
} else {
length = host->req->data_len - host->block_pos;
off = 0;
}
dev_dbg(&sock->dev, "fifo data transfer, %d, %d\n", length,
host->block_pos);
while (length) {
unsigned int uninitialized_var(p_off);
if (host->req->long_data) {
pg = nth_page(sg_page(&host->req->sg),
off >> PAGE_SHIFT);
p_off = offset_in_page(off);
p_cnt = PAGE_SIZE - p_off;
p_cnt = min(p_cnt, length);
local_irq_save(flags);
buf = kmap_atomic(pg, KM_BIO_SRC_IRQ) + p_off;
} else {
buf = host->req->data + host->block_pos;
p_cnt = host->req->data_len - host->block_pos;
}
t_size = host->req->data_dir == WRITE
? tifm_ms_write_data(host, buf, p_cnt)
: tifm_ms_read_data(host, buf, p_cnt);
if (host->req->long_data) {
kunmap_atomic(buf - p_off, KM_BIO_SRC_IRQ);
local_irq_restore(flags);
}
if (!t_size)
break;
host->block_pos += t_size;
length -= t_size;
off += t_size;
}
dev_dbg(&sock->dev, "fifo data transfer, %d remaining\n", length);
if (!length && (host->req->data_dir == WRITE)) {
if (host->io_pos) {
writel(TIFM_MS_SYS_FDIR
| readl(sock->addr + SOCK_MS_SYSTEM),
sock->addr + SOCK_MS_SYSTEM);
writel(host->io_word, sock->addr + SOCK_MS_DATA);
}
writel(TIFM_MS_SYS_FDIR
| readl(sock->addr + SOCK_MS_SYSTEM),
sock->addr + SOCK_MS_SYSTEM);
writel(0, sock->addr + SOCK_MS_DATA);
} else {
readl(sock->addr + SOCK_MS_DATA);
}
return length;
}
static int tifm_ms_issue_cmd(struct tifm_ms *host)
{
struct tifm_dev *sock = host->dev;
unsigned char *data;
unsigned int data_len, cmd, sys_param;
host->cmd_flags = 0;
host->block_pos = 0;
host->io_pos = 0;
host->io_word = 0;
host->cmd_flags = 0;
data = host->req->data;
host->use_dma = !no_dma;
if (host->req->long_data) {
data_len = host->req->sg.length;
if (!is_power_of_2(data_len))
host->use_dma = 0;
} else {
data_len = host->req->data_len;
host->use_dma = 0;
}
writel(TIFM_FIFO_INT_SETALL,
sock->addr + SOCK_DMA_FIFO_INT_ENABLE_CLEAR);
writel(TIFM_FIFO_ENABLE,
sock->addr + SOCK_FIFO_CONTROL);
if (host->use_dma) {
if (1 != tifm_map_sg(sock, &host->req->sg, 1,
host->req->data_dir == READ
? PCI_DMA_FROMDEVICE
: PCI_DMA_TODEVICE)) {
host->req->error = -ENOMEM;
return host->req->error;
}
data_len = sg_dma_len(&host->req->sg);
writel(ilog2(data_len) - 2,
sock->addr + SOCK_FIFO_PAGE_SIZE);
writel(TIFM_FIFO_INTMASK,
sock->addr + SOCK_DMA_FIFO_INT_ENABLE_SET);
sys_param = TIFM_DMA_EN | (1 << 8);
if (host->req->data_dir == WRITE)
sys_param |= TIFM_DMA_TX;
writel(TIFM_FIFO_INTMASK,
sock->addr + SOCK_DMA_FIFO_INT_ENABLE_SET);
writel(sg_dma_address(&host->req->sg),
sock->addr + SOCK_DMA_ADDRESS);
writel(sys_param, sock->addr + SOCK_DMA_CONTROL);
} else {
writel(host->mode_mask | TIFM_MS_SYS_FIFO,
sock->addr + SOCK_MS_SYSTEM);
writel(TIFM_FIFO_MORE,
sock->addr + SOCK_DMA_FIFO_INT_ENABLE_SET);
}
mod_timer(&host->timer, jiffies + host->timeout_jiffies);
writel(TIFM_CTRL_LED | readl(sock->addr + SOCK_CONTROL),
sock->addr + SOCK_CONTROL);
host->req->error = 0;
sys_param = readl(sock->addr + SOCK_MS_SYSTEM);
sys_param |= TIFM_MS_SYS_INTCLR;
if (host->use_dma)
sys_param |= TIFM_MS_SYS_DMA;
else
sys_param &= ~TIFM_MS_SYS_DMA;
writel(sys_param, sock->addr + SOCK_MS_SYSTEM);
cmd = (host->req->tpc & 0xf) << 12;
cmd |= data_len;
writel(cmd, sock->addr + SOCK_MS_COMMAND);
dev_dbg(&sock->dev, "executing TPC %x, %x\n", cmd, sys_param);
return 0;
}
static void tifm_ms_complete_cmd(struct tifm_ms *host)
{
struct tifm_dev *sock = host->dev;
struct memstick_host *msh = tifm_get_drvdata(sock);
int rc;
del_timer(&host->timer);
host->req->int_reg = readl(sock->addr + SOCK_MS_STATUS) & 0xff;
host->req->int_reg = (host->req->int_reg & 1)
| ((host->req->int_reg << 4) & 0xe0);
writel(TIFM_FIFO_INT_SETALL,
sock->addr + SOCK_DMA_FIFO_INT_ENABLE_CLEAR);
writel(TIFM_DMA_RESET, sock->addr + SOCK_DMA_CONTROL);
if (host->use_dma) {
tifm_unmap_sg(sock, &host->req->sg, 1,
host->req->data_dir == READ
? PCI_DMA_FROMDEVICE
: PCI_DMA_TODEVICE);
}
writel((~TIFM_CTRL_LED) & readl(sock->addr + SOCK_CONTROL),
sock->addr + SOCK_CONTROL);
dev_dbg(&sock->dev, "TPC complete\n");
do {
rc = memstick_next_req(msh, &host->req);
} while (!rc && tifm_ms_issue_cmd(host));
}
static int tifm_ms_check_status(struct tifm_ms *host)
{
if (!host->req->error) {
if (!(host->cmd_flags & CMD_READY))
return 1;
if (!(host->cmd_flags & FIFO_READY))
return 1;
if (host->req->need_card_int
&& !(host->cmd_flags & CARD_INT))
return 1;
}
return 0;
}
/* Called from interrupt handler */
static void tifm_ms_data_event(struct tifm_dev *sock)
{
struct tifm_ms *host;
unsigned int fifo_status = 0, host_status = 0;
int rc = 1;
spin_lock(&sock->lock);
host = memstick_priv((struct memstick_host *)tifm_get_drvdata(sock));
fifo_status = readl(sock->addr + SOCK_DMA_FIFO_STATUS);
host_status = readl(sock->addr + SOCK_MS_STATUS);
dev_dbg(&sock->dev,
"data event: fifo_status %x, host_status %x, flags %x\n",
fifo_status, host_status, host->cmd_flags);
if (host->req) {
if (host->use_dma && (fifo_status & 1)) {
host->cmd_flags |= FIFO_READY;
rc = tifm_ms_check_status(host);
}
if (!host->use_dma && (fifo_status & TIFM_FIFO_MORE)) {
if (!tifm_ms_transfer_data(host)) {
host->cmd_flags |= FIFO_READY;
rc = tifm_ms_check_status(host);
}
}
}
writel(fifo_status, sock->addr + SOCK_DMA_FIFO_STATUS);
if (!rc)
tifm_ms_complete_cmd(host);
spin_unlock(&sock->lock);
}
/* Called from interrupt handler */
static void tifm_ms_card_event(struct tifm_dev *sock)
{
struct tifm_ms *host;
unsigned int host_status = 0;
int rc = 1;
spin_lock(&sock->lock);
host = memstick_priv((struct memstick_host *)tifm_get_drvdata(sock));
host_status = readl(sock->addr + SOCK_MS_STATUS);
dev_dbg(&sock->dev, "host event: host_status %x, flags %x\n",
host_status, host->cmd_flags);
if (host->req) {
if (host_status & TIFM_MS_STAT_TOE)
host->req->error = -ETIME;
else if (host_status & TIFM_MS_STAT_CRC)
host->req->error = -EILSEQ;
if (host_status & TIFM_MS_STAT_RDY)
host->cmd_flags |= CMD_READY;
if (host_status & TIFM_MS_STAT_MSINT)
host->cmd_flags |= CARD_INT;
rc = tifm_ms_check_status(host);
}
writel(TIFM_MS_SYS_INTCLR | readl(sock->addr + SOCK_MS_SYSTEM),
sock->addr + SOCK_MS_SYSTEM);
if (!rc)
tifm_ms_complete_cmd(host);
spin_unlock(&sock->lock);
return;
}
static void tifm_ms_req_tasklet(unsigned long data)
{
struct memstick_host *msh = (struct memstick_host *)data;
struct tifm_ms *host = memstick_priv(msh);
struct tifm_dev *sock = host->dev;
unsigned long flags;
int rc;
spin_lock_irqsave(&sock->lock, flags);
if (!host->req) {
if (host->eject) {
do {
rc = memstick_next_req(msh, &host->req);
if (!rc)
host->req->error = -ETIME;
} while (!rc);
spin_unlock_irqrestore(&sock->lock, flags);
return;
}
do {
rc = memstick_next_req(msh, &host->req);
} while (!rc && tifm_ms_issue_cmd(host));
}
spin_unlock_irqrestore(&sock->lock, flags);
}
static void tifm_ms_dummy_submit(struct memstick_host *msh)
{
return;
}
static void tifm_ms_submit_req(struct memstick_host *msh)
{
struct tifm_ms *host = memstick_priv(msh);
tasklet_schedule(&host->notify);
}
static int tifm_ms_set_param(struct memstick_host *msh,
enum memstick_param param,
int value)
{
struct tifm_ms *host = memstick_priv(msh);
struct tifm_dev *sock = host->dev;
switch (param) {
case MEMSTICK_POWER:
/* also affected by media detection mechanism */
if (value == MEMSTICK_POWER_ON) {
host->mode_mask = TIFM_MS_SYS_SRAC | TIFM_MS_SYS_REI;
writel(TIFM_MS_SYS_RESET, sock->addr + SOCK_MS_SYSTEM);
writel(TIFM_MS_SYS_FCLR | TIFM_MS_SYS_INTCLR,
sock->addr + SOCK_MS_SYSTEM);
writel(0xffffffff, sock->addr + SOCK_MS_STATUS);
} else if (value == MEMSTICK_POWER_OFF) {
writel(TIFM_MS_SYS_FCLR | TIFM_MS_SYS_INTCLR,
sock->addr + SOCK_MS_SYSTEM);
writel(0xffffffff, sock->addr + SOCK_MS_STATUS);
} else
return -EINVAL;
break;
case MEMSTICK_INTERFACE:
if (value == MEMSTICK_SERIAL) {
host->mode_mask = TIFM_MS_SYS_SRAC | TIFM_MS_SYS_REI;
writel((~TIFM_CTRL_FAST_CLK)
& readl(sock->addr + SOCK_CONTROL),
sock->addr + SOCK_CONTROL);
} else if (value == MEMSTICK_PAR4) {
host->mode_mask = 0;
writel(TIFM_CTRL_FAST_CLK
| readl(sock->addr + SOCK_CONTROL),
sock->addr + SOCK_CONTROL);
} else
return -EINVAL;
break;
};
return 0;
}
static void tifm_ms_abort(unsigned long data)
{
struct tifm_ms *host = (struct tifm_ms *)data;
dev_dbg(&host->dev->dev, "status %x\n",
readl(host->dev->addr + SOCK_MS_STATUS));
printk(KERN_ERR
"%s : card failed to respond for a long period of time "
"(%x, %x)\n",
dev_name(&host->dev->dev), host->req ? host->req->tpc : 0,
host->cmd_flags);
tifm_eject(host->dev);
}
static int tifm_ms_probe(struct tifm_dev *sock)
{
struct memstick_host *msh;
struct tifm_ms *host;
int rc = -EIO;
if (!(TIFM_SOCK_STATE_OCCUPIED
& readl(sock->addr + SOCK_PRESENT_STATE))) {
printk(KERN_WARNING "%s : card gone, unexpectedly\n",
dev_name(&sock->dev));
return rc;
}
msh = memstick_alloc_host(sizeof(struct tifm_ms), &sock->dev);
if (!msh)
return -ENOMEM;
host = memstick_priv(msh);
tifm_set_drvdata(sock, msh);
host->dev = sock;
host->timeout_jiffies = msecs_to_jiffies(1000);
setup_timer(&host->timer, tifm_ms_abort, (unsigned long)host);
tasklet_init(&host->notify, tifm_ms_req_tasklet, (unsigned long)msh);
msh->request = tifm_ms_submit_req;
msh->set_param = tifm_ms_set_param;
sock->card_event = tifm_ms_card_event;
sock->data_event = tifm_ms_data_event;
if (tifm_has_ms_pif(sock))
msh->caps |= MEMSTICK_CAP_PAR4;
rc = memstick_add_host(msh);
if (!rc)
return 0;
memstick_free_host(msh);
return rc;
}
static void tifm_ms_remove(struct tifm_dev *sock)
{
struct memstick_host *msh = tifm_get_drvdata(sock);
struct tifm_ms *host = memstick_priv(msh);
int rc = 0;
unsigned long flags;
msh->request = tifm_ms_dummy_submit;
tasklet_kill(&host->notify);
spin_lock_irqsave(&sock->lock, flags);
host->eject = 1;
if (host->req) {
del_timer(&host->timer);
writel(TIFM_FIFO_INT_SETALL,
sock->addr + SOCK_DMA_FIFO_INT_ENABLE_CLEAR);
writel(TIFM_DMA_RESET, sock->addr + SOCK_DMA_CONTROL);
if (host->use_dma)
tifm_unmap_sg(sock, &host->req->sg, 1,
host->req->data_dir == READ
? PCI_DMA_TODEVICE
: PCI_DMA_FROMDEVICE);
host->req->error = -ETIME;
do {
rc = memstick_next_req(msh, &host->req);
if (!rc)
host->req->error = -ETIME;
} while (!rc);
}
spin_unlock_irqrestore(&sock->lock, flags);
memstick_remove_host(msh);
memstick_free_host(msh);
}
#ifdef CONFIG_PM
static int tifm_ms_suspend(struct tifm_dev *sock, pm_message_t state)
{
struct memstick_host *msh = tifm_get_drvdata(sock);
memstick_suspend_host(msh);
return 0;
}
static int tifm_ms_resume(struct tifm_dev *sock)
{
struct memstick_host *msh = tifm_get_drvdata(sock);
memstick_resume_host(msh);
return 0;
}
#else
#define tifm_ms_suspend NULL
#define tifm_ms_resume NULL
#endif /* CONFIG_PM */
static struct tifm_device_id tifm_ms_id_tbl[] = {
{ TIFM_TYPE_MS }, { 0 }
};
static struct tifm_driver tifm_ms_driver = {
.driver = {
.name = DRIVER_NAME,
.owner = THIS_MODULE
},
.id_table = tifm_ms_id_tbl,
.probe = tifm_ms_probe,
.remove = tifm_ms_remove,
.suspend = tifm_ms_suspend,
.resume = tifm_ms_resume
};
static int __init tifm_ms_init(void)
{
return tifm_register_driver(&tifm_ms_driver);
}
static void __exit tifm_ms_exit(void)
{
tifm_unregister_driver(&tifm_ms_driver);
}
MODULE_AUTHOR("Alex Dubov");
MODULE_DESCRIPTION("TI FlashMedia MemoryStick driver");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(tifm, tifm_ms_id_tbl);
module_init(tifm_ms_init);
module_exit(tifm_ms_exit);