#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/gpio.h>
+#include <linux/mg_disk.h>
+#include <linux/slab.h>
#define MG_RES_SEC (CONFIG_MG_DISK_RES << 1)
/* name for block device */
#define MG_DISK_NAME "mgd"
-/* name for platform device */
-#define MG_DEV_NAME "mg_disk"
#define MG_DISK_MAJ 0
#define MG_DISK_MAX_PART 16
/* Register offsets */
#define MG_BUFF_OFFSET 0x8000
-#define MG_STORAGE_BUFFER_SIZE 0x200
#define MG_REG_OFFSET 0xC000
#define MG_REG_FEATURE (MG_REG_OFFSET + 2) /* write case */
#define MG_REG_ERROR (MG_REG_OFFSET + 2) /* read case */
#define MG_TMAX_SWRST_TO_RDY 500
#define MG_TMAX_RSTOUT 3000
-/* device attribution */
-/* use mflash as boot device */
-#define MG_BOOT_DEV (1 << 0)
-/* use mflash as storage device */
-#define MG_STORAGE_DEV (1 << 1)
-/* same as MG_STORAGE_DEV, but bootloader already done reset sequence */
-#define MG_STORAGE_DEV_SKIP_RST (1 << 2)
-
#define MG_DEV_MASK (MG_BOOT_DEV | MG_STORAGE_DEV | MG_STORAGE_DEV_SKIP_RST)
-/* names of GPIO resource */
-#define MG_RST_PIN "mg_rst"
-/* except MG_BOOT_DEV, reset-out pin should be assigned */
-#define MG_RSTOUT_PIN "mg_rstout"
-
-/* private driver data */
-struct mg_drv_data {
- /* disk resource */
- u32 use_polling;
-
- /* device attribution */
- u32 dev_attr;
-
- /* internally used */
- struct mg_host *host;
-};
-
/* main structure for mflash driver */
struct mg_host {
struct device *dev;
host->error = MG_ERR_NONE;
expire = jiffies + msecs_to_jiffies(msec);
+ /* These 2 times dummy status read prevents reading invalid
+ * status. A very little time (3 times of mflash operating clk)
+ * is required for busy bit is set. Use dummy read instead of
+ * busy wait, because mflash's PLL is machine dependent.
+ */
+ if (prv_data->use_polling) {
+ status = inb((unsigned long)host->dev_base + MG_REG_STATUS);
+ status = inb((unsigned long)host->dev_base + MG_REG_STATUS);
+ }
+
status = inb((unsigned long)host->dev_base + MG_REG_STATUS);
do {
mg_dump_status("not ready", status, host);
return MG_ERR_INV_STAT;
}
- if (prv_data->use_polling)
- msleep(1);
status = inb((unsigned long)host->dev_base + MG_REG_STATUS);
} while (time_before(cur_jiffies, expire));
return MG_ERR_NONE;
}
+static void mg_read_one(struct mg_host *host, struct request *req)
+{
+ u16 *buff = (u16 *)req->buffer;
+ u32 i;
+
+ for (i = 0; i < MG_SECTOR_SIZE >> 1; i++)
+ *buff++ = inw((unsigned long)host->dev_base + MG_BUFF_OFFSET +
+ (i << 1));
+}
+
static void mg_read(struct request *req)
{
- u32 j;
struct mg_host *host = req->rq_disk->private_data;
if (mg_out(host, blk_rq_pos(req), blk_rq_sectors(req),
blk_rq_sectors(req), blk_rq_pos(req), req->buffer);
do {
- u16 *buff = (u16 *)req->buffer;
-
if (mg_wait(host, ATA_DRQ,
MG_TMAX_WAIT_RD_DRQ) != MG_ERR_NONE) {
mg_bad_rw_intr(host);
return;
}
- for (j = 0; j < MG_SECTOR_SIZE >> 1; j++)
- *buff++ = inw((unsigned long)host->dev_base +
- MG_BUFF_OFFSET + (j << 1));
+
+ mg_read_one(host, req);
outb(MG_CMD_RD_CONF, (unsigned long)host->dev_base +
MG_REG_COMMAND);
} while (mg_end_request(host, 0, MG_SECTOR_SIZE));
}
+static void mg_write_one(struct mg_host *host, struct request *req)
+{
+ u16 *buff = (u16 *)req->buffer;
+ u32 i;
+
+ for (i = 0; i < MG_SECTOR_SIZE >> 1; i++)
+ outw(*buff++, (unsigned long)host->dev_base + MG_BUFF_OFFSET +
+ (i << 1));
+}
+
static void mg_write(struct request *req)
{
- u32 j;
struct mg_host *host = req->rq_disk->private_data;
+ unsigned int rem = blk_rq_sectors(req);
- if (mg_out(host, blk_rq_pos(req), blk_rq_sectors(req),
+ if (mg_out(host, blk_rq_pos(req), rem,
MG_CMD_WR, NULL) != MG_ERR_NONE) {
mg_bad_rw_intr(host);
return;
}
MG_DBG("requested %d sects (from %ld), buffer=0x%p\n",
- blk_rq_sectors(req), blk_rq_pos(req), req->buffer);
+ rem, blk_rq_pos(req), req->buffer);
+
+ if (mg_wait(host, ATA_DRQ,
+ MG_TMAX_WAIT_WR_DRQ) != MG_ERR_NONE) {
+ mg_bad_rw_intr(host);
+ return;
+ }
do {
- u16 *buff = (u16 *)req->buffer;
+ mg_write_one(host, req);
+
+ outb(MG_CMD_WR_CONF, (unsigned long)host->dev_base +
+ MG_REG_COMMAND);
- if (mg_wait(host, ATA_DRQ, MG_TMAX_WAIT_WR_DRQ) != MG_ERR_NONE) {
+ rem--;
+ if (rem > 1 && mg_wait(host, ATA_DRQ,
+ MG_TMAX_WAIT_WR_DRQ) != MG_ERR_NONE) {
+ mg_bad_rw_intr(host);
+ return;
+ } else if (mg_wait(host, MG_STAT_READY,
+ MG_TMAX_WAIT_WR_DRQ) != MG_ERR_NONE) {
mg_bad_rw_intr(host);
return;
}
- for (j = 0; j < MG_SECTOR_SIZE >> 1; j++)
- outw(*buff++, (unsigned long)host->dev_base +
- MG_BUFF_OFFSET + (j << 1));
-
- outb(MG_CMD_WR_CONF, (unsigned long)host->dev_base +
- MG_REG_COMMAND);
} while (mg_end_request(host, 0, MG_SECTOR_SIZE));
}
{
struct request *req = host->req;
u32 i;
- u16 *buff;
/* check status */
do {
return;
ok_to_read:
- /* get current segment of request */
- buff = (u16 *)req->buffer;
-
- /* read 1 sector */
- for (i = 0; i < MG_SECTOR_SIZE >> 1; i++)
- *buff++ = inw((unsigned long)host->dev_base + MG_BUFF_OFFSET +
- (i << 1));
+ mg_read_one(host, req);
MG_DBG("sector %ld, remaining=%ld, buffer=0x%p\n",
blk_rq_pos(req), blk_rq_sectors(req) - 1, req->buffer);
static void mg_write_intr(struct mg_host *host)
{
struct request *req = host->req;
- u32 i, j;
- u16 *buff;
+ u32 i;
bool rem;
/* check status */
ok_to_write:
if ((rem = mg_end_request(host, 0, MG_SECTOR_SIZE))) {
/* write 1 sector and set handler if remains */
- buff = (u16 *)req->buffer;
- for (j = 0; j < MG_STORAGE_BUFFER_SIZE >> 1; j++) {
- outw(*buff, (unsigned long)host->dev_base +
- MG_BUFF_OFFSET + (j << 1));
- buff++;
- }
+ mg_write_one(host, req);
MG_DBG("sector %ld, remaining=%ld, buffer=0x%p\n",
blk_rq_pos(req), blk_rq_sectors(req), req->buffer);
host->mg_do_intr = mg_write_intr;
break;
}
- if (unlikely(!blk_fs_request(host->req))) {
+ if (unlikely(host->req->cmd_type != REQ_TYPE_FS)) {
mg_end_request_cur(host, -EIO);
continue;
}
unsigned int sect_num,
unsigned int sect_cnt)
{
- u16 *buff;
- u32 i;
-
switch (rq_data_dir(req)) {
case READ:
if (mg_out(host, sect_num, sect_cnt, MG_CMD_RD, &mg_read_intr)
mg_bad_rw_intr(host);
return host->error;
}
- buff = (u16 *)req->buffer;
- for (i = 0; i < MG_SECTOR_SIZE >> 1; i++) {
- outw(*buff, (unsigned long)host->dev_base +
- MG_BUFF_OFFSET + (i << 1));
- buff++;
- }
+ mg_write_one(host, req);
mod_timer(&host->timer, jiffies + 3 * HZ);
outb(MG_CMD_WR_CONF, (unsigned long)host->dev_base +
MG_REG_COMMAND);
continue;
}
- if (unlikely(!blk_fs_request(req))) {
+ if (unlikely(req->cmd_type != REQ_TYPE_FS)) {
mg_end_request_cur(host, -EIO);
continue;
}
return 0;
}
-static struct block_device_operations mg_disk_ops = {
+static const struct block_device_operations mg_disk_ops = {
.getgeo = mg_getgeo
};
err = -EINVAL;
goto probe_err_2;
}
- host->dev_base = ioremap(rsc->start , rsc->end + 1);
+ host->dev_base = ioremap(rsc->start, resource_size(rsc));
if (!host->dev_base) {
printk(KERN_ERR "%s:%d ioremap fail\n",
__func__, __LINE__);
host->breq->queuedata = host;
/* mflash is random device, thanx for the noop */
- elevator_exit(host->breq->elevator);
- err = elevator_init(host->breq, "noop");
+ err = elevator_change(host->breq, "noop");
if (err) {
printk(KERN_ERR "%s:%d (elevator_init) fail\n",
__func__, __LINE__);
goto probe_err_6;
}
- blk_queue_max_sectors(host->breq, MG_MAX_SECTS);
+ blk_queue_max_hw_sectors(host->breq, MG_MAX_SECTS);
blk_queue_logical_block_size(host->breq, MG_SECTOR_SIZE);
init_timer(&host->timer);
Code Review / linux-2.6.git / blobdiff