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WSL2-Linux-Kernel
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WSL2-Linux-Kernel/drivers/block/mg_disk.c

1006 строки
24 KiB
C
Исходник Ответственный История

/*
* drivers/block/mg_disk.c
*
* Support for the mGine m[g]flash IO mode.
* Based on legacy hd.c
*
* (c) 2008 mGine Co.,LTD
* (c) 2008 unsik Kim <donari75@gmail.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/kernel.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/blkdev.h>
#include <linux/hdreg.h>
#include <linux/libata.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/gpio.h>
#include <linux/mg_disk.h>
#define MG_RES_SEC (CONFIG_MG_DISK_RES << 1)
static void mg_request(struct request_queue *);
static void mg_dump_status(const char *msg, unsigned int stat,
struct mg_host *host)
{
char *name = MG_DISK_NAME;
struct request *req;
if (host->breq) {
req = elv_next_request(host->breq);
if (req)
name = req->rq_disk->disk_name;
}
printk(KERN_ERR "%s: %s: status=0x%02x { ", name, msg, stat & 0xff);
if (stat & MG_REG_STATUS_BIT_BUSY)
printk("Busy ");
if (stat & MG_REG_STATUS_BIT_READY)
printk("DriveReady ");
if (stat & MG_REG_STATUS_BIT_WRITE_FAULT)
printk("WriteFault ");
if (stat & MG_REG_STATUS_BIT_SEEK_DONE)
printk("SeekComplete ");
if (stat & MG_REG_STATUS_BIT_DATA_REQ)
printk("DataRequest ");
if (stat & MG_REG_STATUS_BIT_CORRECTED_ERROR)
printk("CorrectedError ");
if (stat & MG_REG_STATUS_BIT_ERROR)
printk("Error ");
printk("}\n");
if ((stat & MG_REG_STATUS_BIT_ERROR) == 0) {
host->error = 0;
} else {
host->error = inb((unsigned long)host->dev_base + MG_REG_ERROR);
printk(KERN_ERR "%s: %s: error=0x%02x { ", name, msg,
host->error & 0xff);
if (host->error & MG_REG_ERR_BBK)
printk("BadSector ");
if (host->error & MG_REG_ERR_UNC)
printk("UncorrectableError ");
if (host->error & MG_REG_ERR_IDNF)
printk("SectorIdNotFound ");
if (host->error & MG_REG_ERR_ABRT)
printk("DriveStatusError ");
if (host->error & MG_REG_ERR_AMNF)
printk("AddrMarkNotFound ");
printk("}");
if (host->error &
(MG_REG_ERR_BBK | MG_REG_ERR_UNC |
MG_REG_ERR_IDNF | MG_REG_ERR_AMNF)) {
if (host->breq) {
req = elv_next_request(host->breq);
if (req)
printk(", sector=%ld", req->sector);
}
}
printk("\n");
}
}
static unsigned int mg_wait(struct mg_host *host, u32 expect, u32 msec)
{
u8 status;
unsigned long expire, cur_jiffies;
struct mg_drv_data *prv_data = host->dev->platform_data;
host->error = MG_ERR_NONE;
expire = jiffies + msecs_to_jiffies(msec);
status = inb((unsigned long)host->dev_base + MG_REG_STATUS);
do {
cur_jiffies = jiffies;
if (status & MG_REG_STATUS_BIT_BUSY) {
if (expect == MG_REG_STATUS_BIT_BUSY)
break;
} else {
/* Check the error condition! */
if (status & MG_REG_STATUS_BIT_ERROR) {
mg_dump_status("mg_wait", status, host);
break;
}
if (expect == MG_STAT_READY)
if (MG_READY_OK(status))
break;
if (expect == MG_REG_STATUS_BIT_DATA_REQ)
if (status & MG_REG_STATUS_BIT_DATA_REQ)
break;
}
if (!msec) {
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));
if (time_after_eq(cur_jiffies, expire) && msec)
host->error = MG_ERR_TIMEOUT;
return host->error;
}
static unsigned int mg_wait_rstout(u32 rstout, u32 msec)
{
unsigned long expire;
expire = jiffies + msecs_to_jiffies(msec);
while (time_before(jiffies, expire)) {
if (gpio_get_value(rstout) == 1)
return MG_ERR_NONE;
msleep(10);
}
return MG_ERR_RSTOUT;
}
static void mg_unexpected_intr(struct mg_host *host)
{
u32 status = inb((unsigned long)host->dev_base + MG_REG_STATUS);
mg_dump_status("mg_unexpected_intr", status, host);
}
static irqreturn_t mg_irq(int irq, void *dev_id)
{
struct mg_host *host = dev_id;
void (*handler)(struct mg_host *) = host->mg_do_intr;
host->mg_do_intr = 0;
del_timer(&host->timer);
if (!handler)
handler = mg_unexpected_intr;
handler(host);
return IRQ_HANDLED;
}
static int mg_get_disk_id(struct mg_host *host)
{
u32 i;
s32 err;
const u16 *id = host->id;
struct mg_drv_data *prv_data = host->dev->platform_data;
char fwrev[ATA_ID_FW_REV_LEN + 1];
char model[ATA_ID_PROD_LEN + 1];
char serial[ATA_ID_SERNO_LEN + 1];
if (!prv_data->use_polling)
outb(MG_REG_CTRL_INTR_DISABLE,
(unsigned long)host->dev_base +
MG_REG_DRV_CTRL);
outb(MG_CMD_ID, (unsigned long)host->dev_base + MG_REG_COMMAND);
err = mg_wait(host, MG_REG_STATUS_BIT_DATA_REQ, MG_TMAX_WAIT_RD_DRQ);
if (err)
return err;
for (i = 0; i < (MG_SECTOR_SIZE >> 1); i++)
host->id[i] = le16_to_cpu(inw((unsigned long)host->dev_base +
MG_BUFF_OFFSET + i * 2));
outb(MG_CMD_RD_CONF, (unsigned long)host->dev_base + MG_REG_COMMAND);
err = mg_wait(host, MG_STAT_READY, MG_TMAX_CONF_TO_CMD);
if (err)
return err;
if ((id[ATA_ID_FIELD_VALID] & 1) == 0)
return MG_ERR_TRANSLATION;
host->n_sectors = ata_id_u32(id, ATA_ID_LBA_CAPACITY);
host->cyls = id[ATA_ID_CYLS];
host->heads = id[ATA_ID_HEADS];
host->sectors = id[ATA_ID_SECTORS];
if (MG_RES_SEC && host->heads && host->sectors) {
/* modify cyls, n_sectors */
host->cyls = (host->n_sectors - MG_RES_SEC) /
host->heads / host->sectors;
host->nres_sectors = host->n_sectors - host->cyls *
host->heads * host->sectors;
host->n_sectors -= host->nres_sectors;
}
ata_id_c_string(id, fwrev, ATA_ID_FW_REV, sizeof(fwrev));
ata_id_c_string(id, model, ATA_ID_PROD, sizeof(model));
ata_id_c_string(id, serial, ATA_ID_SERNO, sizeof(serial));
printk(KERN_INFO "mg_disk: model: %s\n", model);
printk(KERN_INFO "mg_disk: firm: %.8s\n", fwrev);
printk(KERN_INFO "mg_disk: serial: %s\n", serial);
printk(KERN_INFO "mg_disk: %d + reserved %d sectors\n",
host->n_sectors, host->nres_sectors);
if (!prv_data->use_polling)
outb(MG_REG_CTRL_INTR_ENABLE, (unsigned long)host->dev_base +
MG_REG_DRV_CTRL);
return err;
}
static int mg_disk_init(struct mg_host *host)
{
struct mg_drv_data *prv_data = host->dev->platform_data;
s32 err;
u8 init_status;
/* hdd rst low */
gpio_set_value(host->rst, 0);
err = mg_wait(host, MG_REG_STATUS_BIT_BUSY, MG_TMAX_RST_TO_BUSY);
if (err)
return err;
/* hdd rst high */
gpio_set_value(host->rst, 1);
err = mg_wait(host, MG_STAT_READY, MG_TMAX_HDRST_TO_RDY);
if (err)
return err;
/* soft reset on */
outb(MG_REG_CTRL_RESET |
(prv_data->use_polling ? MG_REG_CTRL_INTR_DISABLE :
MG_REG_CTRL_INTR_ENABLE),
(unsigned long)host->dev_base + MG_REG_DRV_CTRL);
err = mg_wait(host, MG_REG_STATUS_BIT_BUSY, MG_TMAX_RST_TO_BUSY);
if (err)
return err;
/* soft reset off */
outb(prv_data->use_polling ? MG_REG_CTRL_INTR_DISABLE :
MG_REG_CTRL_INTR_ENABLE,
(unsigned long)host->dev_base + MG_REG_DRV_CTRL);
err = mg_wait(host, MG_STAT_READY, MG_TMAX_SWRST_TO_RDY);
if (err)
return err;
init_status = inb((unsigned long)host->dev_base + MG_REG_STATUS) & 0xf;
if (init_status == 0xf)
return MG_ERR_INIT_STAT;
return err;
}
static void mg_bad_rw_intr(struct mg_host *host)
{
struct request *req = elv_next_request(host->breq);
if (req != NULL)
if (++req->errors >= MG_MAX_ERRORS ||
host->error == MG_ERR_TIMEOUT)
end_request(req, 0);
}
static unsigned int mg_out(struct mg_host *host,
unsigned int sect_num,
unsigned int sect_cnt,
unsigned int cmd,
void (*intr_addr)(struct mg_host *))
{
struct mg_drv_data *prv_data = host->dev->platform_data;
if (mg_wait(host, MG_STAT_READY, MG_TMAX_CONF_TO_CMD))
return host->error;
if (!prv_data->use_polling) {
host->mg_do_intr = intr_addr;
mod_timer(&host->timer, jiffies + 3 * HZ);
}
if (MG_RES_SEC)
sect_num += MG_RES_SEC;
outb((u8)sect_cnt, (unsigned long)host->dev_base + MG_REG_SECT_CNT);
outb((u8)sect_num, (unsigned long)host->dev_base + MG_REG_SECT_NUM);
outb((u8)(sect_num >> 8), (unsigned long)host->dev_base +
MG_REG_CYL_LOW);
outb((u8)(sect_num >> 16), (unsigned long)host->dev_base +
MG_REG_CYL_HIGH);
outb((u8)((sect_num >> 24) | MG_REG_HEAD_LBA_MODE),
(unsigned long)host->dev_base + MG_REG_DRV_HEAD);
outb(cmd, (unsigned long)host->dev_base + MG_REG_COMMAND);
return MG_ERR_NONE;
}
static void mg_read(struct request *req)
{
u32 remains, j;
struct mg_host *host = req->rq_disk->private_data;
remains = req->nr_sectors;
if (mg_out(host, req->sector, req->nr_sectors, MG_CMD_RD, 0) !=
MG_ERR_NONE)
mg_bad_rw_intr(host);
MG_DBG("requested %d sects (from %ld), buffer=0x%p\n",
remains, req->sector, req->buffer);
while (remains) {
if (mg_wait(host, MG_REG_STATUS_BIT_DATA_REQ,
MG_TMAX_WAIT_RD_DRQ) != MG_ERR_NONE) {
mg_bad_rw_intr(host);
return;
}
for (j = 0; j < MG_SECTOR_SIZE >> 1; j++) {
*(u16 *)req->buffer =
inw((unsigned long)host->dev_base +
MG_BUFF_OFFSET + (j << 1));
req->buffer += 2;
}
req->sector++;
req->errors = 0;
remains = --req->nr_sectors;
--req->current_nr_sectors;
if (req->current_nr_sectors <= 0) {
MG_DBG("remain : %d sects\n", remains);
end_request(req, 1);
if (remains > 0)
req = elv_next_request(host->breq);
}
outb(MG_CMD_RD_CONF, (unsigned long)host->dev_base +
MG_REG_COMMAND);
}
}
static void mg_write(struct request *req)
{
u32 remains, j;
struct mg_host *host = req->rq_disk->private_data;
remains = req->nr_sectors;
if (mg_out(host, req->sector, req->nr_sectors, MG_CMD_WR, 0) !=
MG_ERR_NONE) {
mg_bad_rw_intr(host);
return;
}
MG_DBG("requested %d sects (from %ld), buffer=0x%p\n",
remains, req->sector, req->buffer);
while (remains) {
if (mg_wait(host, MG_REG_STATUS_BIT_DATA_REQ,
MG_TMAX_WAIT_WR_DRQ) != MG_ERR_NONE) {
mg_bad_rw_intr(host);
return;
}
for (j = 0; j < MG_SECTOR_SIZE >> 1; j++) {
outw(*(u16 *)req->buffer,
(unsigned long)host->dev_base +
MG_BUFF_OFFSET + (j << 1));
req->buffer += 2;
}
req->sector++;
remains = --req->nr_sectors;
--req->current_nr_sectors;
if (req->current_nr_sectors <= 0) {
MG_DBG("remain : %d sects\n", remains);
end_request(req, 1);
if (remains > 0)
req = elv_next_request(host->breq);
}
outb(MG_CMD_WR_CONF, (unsigned long)host->dev_base +
MG_REG_COMMAND);
}
}
static void mg_read_intr(struct mg_host *host)
{
u32 i;
struct request *req;
/* check status */
do {
i = inb((unsigned long)host->dev_base + MG_REG_STATUS);
if (i & MG_REG_STATUS_BIT_BUSY)
break;
if (!MG_READY_OK(i))
break;
if (i & MG_REG_STATUS_BIT_DATA_REQ)
goto ok_to_read;
} while (0);
mg_dump_status("mg_read_intr", i, host);
mg_bad_rw_intr(host);
mg_request(host->breq);
return;
ok_to_read:
/* get current segment of request */
req = elv_next_request(host->breq);
/* read 1 sector */
for (i = 0; i < MG_SECTOR_SIZE >> 1; i++) {
*(u16 *)req->buffer =
inw((unsigned long)host->dev_base + MG_BUFF_OFFSET +
(i << 1));
req->buffer += 2;
}
/* manipulate request */
MG_DBG("sector %ld, remaining=%ld, buffer=0x%p\n",
req->sector, req->nr_sectors - 1, req->buffer);
req->sector++;
req->errors = 0;
i = --req->nr_sectors;
--req->current_nr_sectors;
/* let know if current segment done */
if (req->current_nr_sectors <= 0)
end_request(req, 1);
/* set handler if read remains */
if (i > 0) {
host->mg_do_intr = mg_read_intr;
mod_timer(&host->timer, jiffies + 3 * HZ);
}
/* send read confirm */
outb(MG_CMD_RD_CONF, (unsigned long)host->dev_base + MG_REG_COMMAND);
/* goto next request */
if (!i)
mg_request(host->breq);
}
static void mg_write_intr(struct mg_host *host)
{
u32 i, j;
u16 *buff;
struct request *req;
/* get current segment of request */
req = elv_next_request(host->breq);
/* check status */
do {
i = inb((unsigned long)host->dev_base + MG_REG_STATUS);
if (i & MG_REG_STATUS_BIT_BUSY)
break;
if (!MG_READY_OK(i))
break;
if ((req->nr_sectors <= 1) || (i & MG_REG_STATUS_BIT_DATA_REQ))
goto ok_to_write;
} while (0);
mg_dump_status("mg_write_intr", i, host);
mg_bad_rw_intr(host);
mg_request(host->breq);
return;
ok_to_write:
/* manipulate request */
req->sector++;
i = --req->nr_sectors;
--req->current_nr_sectors;
req->buffer += MG_SECTOR_SIZE;
/* let know if current segment or all done */
if (!i || (req->bio && req->current_nr_sectors <= 0))
end_request(req, 1);
/* write 1 sector and set handler if remains */
if (i > 0) {
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_DBG("sector %ld, remaining=%ld, buffer=0x%p\n",
req->sector, req->nr_sectors, req->buffer);
host->mg_do_intr = mg_write_intr;
mod_timer(&host->timer, jiffies + 3 * HZ);
}
/* send write confirm */
outb(MG_CMD_WR_CONF, (unsigned long)host->dev_base + MG_REG_COMMAND);
if (!i)
mg_request(host->breq);
}
void mg_times_out(unsigned long data)
{
struct mg_host *host = (struct mg_host *)data;
char *name;
struct request *req;
req = elv_next_request(host->breq);
if (!req)
return;
host->mg_do_intr = NULL;
name = req->rq_disk->disk_name;
printk(KERN_DEBUG "%s: timeout\n", name);
host->error = MG_ERR_TIMEOUT;
mg_bad_rw_intr(host);
mg_request(host->breq);
}
static void mg_request_poll(struct request_queue *q)
{
struct request *req;
struct mg_host *host;
while ((req = elv_next_request(q)) != NULL) {
host = req->rq_disk->private_data;
if (blk_fs_request(req)) {
switch (rq_data_dir(req)) {
case READ:
mg_read(req);
break;
case WRITE:
mg_write(req);
break;
default:
printk(KERN_WARNING "%s:%d unknown command\n",
__func__, __LINE__);
end_request(req, 0);
break;
}
}
}
}
static unsigned int mg_issue_req(struct request *req,
struct mg_host *host,
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_ERR_NONE) {
mg_bad_rw_intr(host);
return host->error;
}
break;
case WRITE:
/* TODO : handler */
outb(MG_REG_CTRL_INTR_DISABLE,
(unsigned long)host->dev_base +
MG_REG_DRV_CTRL);
if (mg_out(host, sect_num, sect_cnt, MG_CMD_WR, &mg_write_intr)
!= MG_ERR_NONE) {
mg_bad_rw_intr(host);
return host->error;
}
del_timer(&host->timer);
mg_wait(host, MG_REG_STATUS_BIT_DATA_REQ, MG_TMAX_WAIT_WR_DRQ);
outb(MG_REG_CTRL_INTR_ENABLE, (unsigned long)host->dev_base +
MG_REG_DRV_CTRL);
if (host->error) {
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++;
}
mod_timer(&host->timer, jiffies + 3 * HZ);
outb(MG_CMD_WR_CONF, (unsigned long)host->dev_base +
MG_REG_COMMAND);
break;
default:
printk(KERN_WARNING "%s:%d unknown command\n",
__func__, __LINE__);
end_request(req, 0);
break;
}
return MG_ERR_NONE;
}
/* This function also called from IRQ context */
static void mg_request(struct request_queue *q)
{
struct request *req;
struct mg_host *host;
u32 sect_num, sect_cnt;
while (1) {
req = elv_next_request(q);
if (!req)
return;
host = req->rq_disk->private_data;
/* check unwanted request call */
if (host->mg_do_intr)
return;
del_timer(&host->timer);
sect_num = req->sector;
/* deal whole segments */
sect_cnt = req->nr_sectors;
/* sanity check */
if (sect_num >= get_capacity(req->rq_disk) ||
((sect_num + sect_cnt) >
get_capacity(req->rq_disk))) {
printk(KERN_WARNING
"%s: bad access: sector=%d, count=%d\n",
req->rq_disk->disk_name,
sect_num, sect_cnt);
end_request(req, 0);
continue;
}
if (!blk_fs_request(req))
return;
if (!mg_issue_req(req, host, sect_num, sect_cnt))
return;
}
}
static int mg_getgeo(struct block_device *bdev, struct hd_geometry *geo)
{
struct mg_host *host = bdev->bd_disk->private_data;
geo->cylinders = (unsigned short)host->cyls;
geo->heads = (unsigned char)host->heads;
geo->sectors = (unsigned char)host->sectors;
return 0;
}
static struct block_device_operations mg_disk_ops = {
.getgeo = mg_getgeo
};
static int mg_suspend(struct platform_device *plat_dev, pm_message_t state)
{
struct mg_drv_data *prv_data = plat_dev->dev.platform_data;
struct mg_host *host = prv_data->host;
if (mg_wait(host, MG_STAT_READY, MG_TMAX_CONF_TO_CMD))
return -EIO;
if (!prv_data->use_polling)
outb(MG_REG_CTRL_INTR_DISABLE,
(unsigned long)host->dev_base +
MG_REG_DRV_CTRL);
outb(MG_CMD_SLEEP, (unsigned long)host->dev_base + MG_REG_COMMAND);
/* wait until mflash deep sleep */
msleep(1);
if (mg_wait(host, MG_STAT_READY, MG_TMAX_CONF_TO_CMD)) {
if (!prv_data->use_polling)
outb(MG_REG_CTRL_INTR_ENABLE,
(unsigned long)host->dev_base +
MG_REG_DRV_CTRL);
return -EIO;
}
return 0;
}
static int mg_resume(struct platform_device *plat_dev)
{
struct mg_drv_data *prv_data = plat_dev->dev.platform_data;
struct mg_host *host = prv_data->host;
if (mg_wait(host, MG_STAT_READY, MG_TMAX_CONF_TO_CMD))
return -EIO;
outb(MG_CMD_WAKEUP, (unsigned long)host->dev_base + MG_REG_COMMAND);
/* wait until mflash wakeup */
msleep(1);
if (mg_wait(host, MG_STAT_READY, MG_TMAX_CONF_TO_CMD))
return -EIO;
if (!prv_data->use_polling)
outb(MG_REG_CTRL_INTR_ENABLE, (unsigned long)host->dev_base +
MG_REG_DRV_CTRL);
return 0;
}
static int mg_probe(struct platform_device *plat_dev)
{
struct mg_host *host;
struct resource *rsc;
struct mg_drv_data *prv_data = plat_dev->dev.platform_data;
int err = 0;
if (!prv_data) {
printk(KERN_ERR "%s:%d fail (no driver_data)\n",
__func__, __LINE__);
err = -EINVAL;
goto probe_err;
}
/* alloc mg_host */
host = kzalloc(sizeof(struct mg_host), GFP_KERNEL);
if (!host) {
printk(KERN_ERR "%s:%d fail (no memory for mg_host)\n",
__func__, __LINE__);
err = -ENOMEM;
goto probe_err;
}
host->major = MG_DISK_MAJ;
/* link each other */
prv_data->host = host;
host->dev = &plat_dev->dev;
/* io remap */
rsc = platform_get_resource(plat_dev, IORESOURCE_MEM, 0);
if (!rsc) {
printk(KERN_ERR "%s:%d platform_get_resource fail\n",
__func__, __LINE__);
err = -EINVAL;
goto probe_err_2;
}
host->dev_base = ioremap(rsc->start , rsc->end + 1);
if (!host->dev_base) {
printk(KERN_ERR "%s:%d ioremap fail\n",
__func__, __LINE__);
err = -EIO;
goto probe_err_2;
}
MG_DBG("dev_base = 0x%x\n", (u32)host->dev_base);
/* get reset pin */
rsc = platform_get_resource_byname(plat_dev, IORESOURCE_IO,
MG_RST_PIN);
if (!rsc) {
printk(KERN_ERR "%s:%d get reset pin fail\n",
__func__, __LINE__);
err = -EIO;
goto probe_err_3;
}
host->rst = rsc->start;
/* init rst pin */
err = gpio_request(host->rst, MG_RST_PIN);
if (err)
goto probe_err_3;
gpio_direction_output(host->rst, 1);
/* reset out pin */
if (!(prv_data->dev_attr & MG_DEV_MASK))
goto probe_err_3a;
if (prv_data->dev_attr != MG_BOOT_DEV) {
rsc = platform_get_resource_byname(plat_dev, IORESOURCE_IO,
MG_RSTOUT_PIN);
if (!rsc) {
printk(KERN_ERR "%s:%d get reset-out pin fail\n",
__func__, __LINE__);
err = -EIO;
goto probe_err_3a;
}
host->rstout = rsc->start;
err = gpio_request(host->rstout, MG_RSTOUT_PIN);
if (err)
goto probe_err_3a;
gpio_direction_input(host->rstout);
}
/* disk reset */
if (prv_data->dev_attr == MG_STORAGE_DEV) {
/* If POR seq. not yet finised, wait */
err = mg_wait_rstout(host->rstout, MG_TMAX_RSTOUT);
if (err)
goto probe_err_3b;
err = mg_disk_init(host);
if (err) {
printk(KERN_ERR "%s:%d fail (err code : %d)\n",
__func__, __LINE__, err);
err = -EIO;
goto probe_err_3b;
}
}
/* get irq resource */
if (!prv_data->use_polling) {
host->irq = platform_get_irq(plat_dev, 0);
if (host->irq == -ENXIO) {
err = host->irq;
goto probe_err_3b;
}
err = request_irq(host->irq, mg_irq,
IRQF_DISABLED | IRQF_TRIGGER_RISING,
MG_DEV_NAME, host);
if (err) {
printk(KERN_ERR "%s:%d fail (request_irq err=%d)\n",
__func__, __LINE__, err);
goto probe_err_3b;
}
}
/* get disk id */
err = mg_get_disk_id(host);
if (err) {
printk(KERN_ERR "%s:%d fail (err code : %d)\n",
__func__, __LINE__, err);
err = -EIO;
goto probe_err_4;
}
err = register_blkdev(host->major, MG_DISK_NAME);
if (err < 0) {
printk(KERN_ERR "%s:%d register_blkdev fail (err code : %d)\n",
__func__, __LINE__, err);
goto probe_err_4;
}
if (!host->major)
host->major = err;
spin_lock_init(&host->lock);
if (prv_data->use_polling)
host->breq = blk_init_queue(mg_request_poll, &host->lock);
else
host->breq = blk_init_queue(mg_request, &host->lock);
if (!host->breq) {
err = -ENOMEM;
printk(KERN_ERR "%s:%d (blk_init_queue) fail\n",
__func__, __LINE__);
goto probe_err_5;
}
/* mflash is random device, thanx for the noop */
elevator_exit(host->breq->elevator);
err = elevator_init(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_hardsect_size(host->breq, MG_SECTOR_SIZE);
init_timer(&host->timer);
host->timer.function = mg_times_out;
host->timer.data = (unsigned long)host;
host->gd = alloc_disk(MG_DISK_MAX_PART);
if (!host->gd) {
printk(KERN_ERR "%s:%d (alloc_disk) fail\n",
__func__, __LINE__);
err = -ENOMEM;
goto probe_err_7;
}
host->gd->major = host->major;
host->gd->first_minor = 0;
host->gd->fops = &mg_disk_ops;
host->gd->queue = host->breq;
host->gd->private_data = host;
sprintf(host->gd->disk_name, MG_DISK_NAME"a");
set_capacity(host->gd, host->n_sectors);
add_disk(host->gd);
return err;
probe_err_7:
del_timer_sync(&host->timer);
probe_err_6:
blk_cleanup_queue(host->breq);
probe_err_5:
unregister_blkdev(MG_DISK_MAJ, MG_DISK_NAME);
probe_err_4:
if (!prv_data->use_polling)
free_irq(host->irq, host);
probe_err_3b:
gpio_free(host->rstout);
probe_err_3a:
gpio_free(host->rst);
probe_err_3:
iounmap(host->dev_base);
probe_err_2:
kfree(host);
probe_err:
return err;
}
static int mg_remove(struct platform_device *plat_dev)
{
struct mg_drv_data *prv_data = plat_dev->dev.platform_data;
struct mg_host *host = prv_data->host;
int err = 0;
/* delete timer */
del_timer_sync(&host->timer);
/* remove disk */
if (host->gd) {
del_gendisk(host->gd);
put_disk(host->gd);
}
/* remove queue */
if (host->breq)
blk_cleanup_queue(host->breq);
/* unregister blk device */
unregister_blkdev(host->major, MG_DISK_NAME);
/* free irq */
if (!prv_data->use_polling)
free_irq(host->irq, host);
/* free reset-out pin */
if (prv_data->dev_attr != MG_BOOT_DEV)
gpio_free(host->rstout);
/* free rst pin */
if (host->rst)
gpio_free(host->rst);
/* unmap io */
if (host->dev_base)
iounmap(host->dev_base);
/* free mg_host */
kfree(host);
return err;
}
static struct platform_driver mg_disk_driver = {
.probe = mg_probe,
.remove = mg_remove,
.suspend = mg_suspend,
.resume = mg_resume,
.driver = {
.name = MG_DEV_NAME,
.owner = THIS_MODULE,
}
};
/****************************************************************************
*
* Module stuff
*
****************************************************************************/
static int __init mg_init(void)
{
printk(KERN_INFO "mGine mflash driver, (c) 2008 mGine Co.\n");
return platform_driver_register(&mg_disk_driver);
}
static void __exit mg_exit(void)
{
printk(KERN_INFO "mflash driver : bye bye\n");
platform_driver_unregister(&mg_disk_driver);
}
module_init(mg_init);
module_exit(mg_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("unsik Kim <donari75@gmail.com>");
MODULE_DESCRIPTION("mGine m[g]flash device driver");
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