linux/drivers/block/mg_disk.c
Tejun Heo 5a0e3ad6af include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files.  percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.

percpu.h -> slab.h dependency is about to be removed.  Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability.  As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.

  http://userweb.kernel.org/~tj/misc/slabh-sweep.py

The script does the followings.

* Scan files for gfp and slab usages and update includes such that
  only the necessary includes are there.  ie. if only gfp is used,
  gfp.h, if slab is used, slab.h.

* When the script inserts a new include, it looks at the include
  blocks and try to put the new include such that its order conforms
  to its surrounding.  It's put in the include block which contains
  core kernel includes, in the same order that the rest are ordered -
  alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
  doesn't seem to be any matching order.

* If the script can't find a place to put a new include (mostly
  because the file doesn't have fitting include block), it prints out
  an error message indicating which .h file needs to be added to the
  file.

The conversion was done in the following steps.

1. The initial automatic conversion of all .c files updated slightly
   over 4000 files, deleting around 700 includes and adding ~480 gfp.h
   and ~3000 slab.h inclusions.  The script emitted errors for ~400
   files.

2. Each error was manually checked.  Some didn't need the inclusion,
   some needed manual addition while adding it to implementation .h or
   embedding .c file was more appropriate for others.  This step added
   inclusions to around 150 files.

3. The script was run again and the output was compared to the edits
   from #2 to make sure no file was left behind.

4. Several build tests were done and a couple of problems were fixed.
   e.g. lib/decompress_*.c used malloc/free() wrappers around slab
   APIs requiring slab.h to be added manually.

5. The script was run on all .h files but without automatically
   editing them as sprinkling gfp.h and slab.h inclusions around .h
   files could easily lead to inclusion dependency hell.  Most gfp.h
   inclusion directives were ignored as stuff from gfp.h was usually
   wildly available and often used in preprocessor macros.  Each
   slab.h inclusion directive was examined and added manually as
   necessary.

6. percpu.h was updated not to include slab.h.

7. Build test were done on the following configurations and failures
   were fixed.  CONFIG_GCOV_KERNEL was turned off for all tests (as my
   distributed build env didn't work with gcov compiles) and a few
   more options had to be turned off depending on archs to make things
   build (like ipr on powerpc/64 which failed due to missing writeq).

   * x86 and x86_64 UP and SMP allmodconfig and a custom test config.
   * powerpc and powerpc64 SMP allmodconfig
   * sparc and sparc64 SMP allmodconfig
   * ia64 SMP allmodconfig
   * s390 SMP allmodconfig
   * alpha SMP allmodconfig
   * um on x86_64 SMP allmodconfig

8. percpu.h modifications were reverted so that it could be applied as
   a separate patch and serve as bisection point.

Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.

Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-30 22:02:32 +09:00

1110 lines
26 KiB
C

/*
* 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/ata.h>
#include <linux/interrupt.h>
#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"
#define MG_DISK_MAJ 0
#define MG_DISK_MAX_PART 16
#define MG_SECTOR_SIZE 512
#define MG_MAX_SECTS 256
/* Register offsets */
#define MG_BUFF_OFFSET 0x8000
#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_REG_SECT_CNT (MG_REG_OFFSET + 4)
#define MG_REG_SECT_NUM (MG_REG_OFFSET + 6)
#define MG_REG_CYL_LOW (MG_REG_OFFSET + 8)
#define MG_REG_CYL_HIGH (MG_REG_OFFSET + 0xA)
#define MG_REG_DRV_HEAD (MG_REG_OFFSET + 0xC)
#define MG_REG_COMMAND (MG_REG_OFFSET + 0xE) /* write case */
#define MG_REG_STATUS (MG_REG_OFFSET + 0xE) /* read case */
#define MG_REG_DRV_CTRL (MG_REG_OFFSET + 0x10)
#define MG_REG_BURST_CTRL (MG_REG_OFFSET + 0x12)
/* handy status */
#define MG_STAT_READY (ATA_DRDY | ATA_DSC)
#define MG_READY_OK(s) (((s) & (MG_STAT_READY | (ATA_BUSY | ATA_DF | \
ATA_ERR))) == MG_STAT_READY)
/* error code for others */
#define MG_ERR_NONE 0
#define MG_ERR_TIMEOUT 0x100
#define MG_ERR_INIT_STAT 0x101
#define MG_ERR_TRANSLATION 0x102
#define MG_ERR_CTRL_RST 0x103
#define MG_ERR_INV_STAT 0x104
#define MG_ERR_RSTOUT 0x105
#define MG_MAX_ERRORS 6 /* Max read/write errors */
/* command */
#define MG_CMD_RD 0x20
#define MG_CMD_WR 0x30
#define MG_CMD_SLEEP 0x99
#define MG_CMD_WAKEUP 0xC3
#define MG_CMD_ID 0xEC
#define MG_CMD_WR_CONF 0x3C
#define MG_CMD_RD_CONF 0x40
/* operation mode */
#define MG_OP_CASCADE (1 << 0)
#define MG_OP_CASCADE_SYNC_RD (1 << 1)
#define MG_OP_CASCADE_SYNC_WR (1 << 2)
#define MG_OP_INTERLEAVE (1 << 3)
/* synchronous */
#define MG_BURST_LAT_4 (3 << 4)
#define MG_BURST_LAT_5 (4 << 4)
#define MG_BURST_LAT_6 (5 << 4)
#define MG_BURST_LAT_7 (6 << 4)
#define MG_BURST_LAT_8 (7 << 4)
#define MG_BURST_LEN_4 (1 << 1)
#define MG_BURST_LEN_8 (2 << 1)
#define MG_BURST_LEN_16 (3 << 1)
#define MG_BURST_LEN_32 (4 << 1)
#define MG_BURST_LEN_CONT (0 << 1)
/* timeout value (unit: ms) */
#define MG_TMAX_CONF_TO_CMD 1
#define MG_TMAX_WAIT_RD_DRQ 10
#define MG_TMAX_WAIT_WR_DRQ 500
#define MG_TMAX_RST_TO_BUSY 10
#define MG_TMAX_HDRST_TO_RDY 500
#define MG_TMAX_SWRST_TO_RDY 500
#define MG_TMAX_RSTOUT 3000
#define MG_DEV_MASK (MG_BOOT_DEV | MG_STORAGE_DEV | MG_STORAGE_DEV_SKIP_RST)
/* main structure for mflash driver */
struct mg_host {
struct device *dev;
struct request_queue *breq;
struct request *req;
spinlock_t lock;
struct gendisk *gd;
struct timer_list timer;
void (*mg_do_intr) (struct mg_host *);
u16 id[ATA_ID_WORDS];
u16 cyls;
u16 heads;
u16 sectors;
u32 n_sectors;
u32 nres_sectors;
void __iomem *dev_base;
unsigned int irq;
unsigned int rst;
unsigned int rstout;
u32 major;
u32 error;
};
/*
* Debugging macro and defines
*/
#undef DO_MG_DEBUG
#ifdef DO_MG_DEBUG
# define MG_DBG(fmt, args...) \
printk(KERN_DEBUG "%s:%d "fmt, __func__, __LINE__, ##args)
#else /* CONFIG_MG_DEBUG */
# define MG_DBG(fmt, args...) do { } while (0)
#endif /* CONFIG_MG_DEBUG */
static void mg_request(struct request_queue *);
static bool mg_end_request(struct mg_host *host, int err, unsigned int nr_bytes)
{
if (__blk_end_request(host->req, err, nr_bytes))
return true;
host->req = NULL;
return false;
}
static bool mg_end_request_cur(struct mg_host *host, int err)
{
return mg_end_request(host, err, blk_rq_cur_bytes(host->req));
}
static void mg_dump_status(const char *msg, unsigned int stat,
struct mg_host *host)
{
char *name = MG_DISK_NAME;
if (host->req)
name = host->req->rq_disk->disk_name;
printk(KERN_ERR "%s: %s: status=0x%02x { ", name, msg, stat & 0xff);
if (stat & ATA_BUSY)
printk("Busy ");
if (stat & ATA_DRDY)
printk("DriveReady ");
if (stat & ATA_DF)
printk("WriteFault ");
if (stat & ATA_DSC)
printk("SeekComplete ");
if (stat & ATA_DRQ)
printk("DataRequest ");
if (stat & ATA_CORR)
printk("CorrectedError ");
if (stat & ATA_ERR)
printk("Error ");
printk("}\n");
if ((stat & ATA_ERR) == 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 & ATA_BBK)
printk("BadSector ");
if (host->error & ATA_UNC)
printk("UncorrectableError ");
if (host->error & ATA_IDNF)
printk("SectorIdNotFound ");
if (host->error & ATA_ABORTED)
printk("DriveStatusError ");
if (host->error & ATA_AMNF)
printk("AddrMarkNotFound ");
printk("}");
if (host->error & (ATA_BBK | ATA_UNC | ATA_IDNF | ATA_AMNF)) {
if (host->req)
printk(", sector=%u",
(unsigned int)blk_rq_pos(host->req));
}
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);
/* 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 {
cur_jiffies = jiffies;
if (status & ATA_BUSY) {
if (expect == ATA_BUSY)
break;
} else {
/* Check the error condition! */
if (status & ATA_ERR) {
mg_dump_status("mg_wait", status, host);
break;
}
if (expect == MG_STAT_READY)
if (MG_READY_OK(status))
break;
if (expect == ATA_DRQ)
if (status & ATA_DRQ)
break;
}
if (!msec) {
mg_dump_status("not ready", status, host);
return MG_ERR_INV_STAT;
}
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;
spin_lock(&host->lock);
host->mg_do_intr = NULL;
del_timer(&host->timer);
if (!handler)
handler = mg_unexpected_intr;
handler(host);
spin_unlock(&host->lock);
return IRQ_HANDLED;
}
/* local copy of ata_id_string() */
static void mg_id_string(const u16 *id, unsigned char *s,
unsigned int ofs, unsigned int len)
{
unsigned int c;
BUG_ON(len & 1);
while (len > 0) {
c = id[ofs] >> 8;
*s = c;
s++;
c = id[ofs] & 0xff;
*s = c;
s++;
ofs++;
len -= 2;
}
}
/* local copy of ata_id_c_string() */
static void mg_id_c_string(const u16 *id, unsigned char *s,
unsigned int ofs, unsigned int len)
{
unsigned char *p;
mg_id_string(id, s, ofs, len - 1);
p = s + strnlen(s, len - 1);
while (p > s && p[-1] == ' ')
p--;
*p = '\0';
}
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(ATA_NIEN, (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, ATA_DRQ, 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;
}
mg_id_c_string(id, fwrev, ATA_ID_FW_REV, sizeof(fwrev));
mg_id_c_string(id, model, ATA_ID_PROD, sizeof(model));
mg_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(0, (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, ATA_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(ATA_SRST | (prv_data->use_polling ? ATA_NIEN : 0),
(unsigned long)host->dev_base + MG_REG_DRV_CTRL);
err = mg_wait(host, ATA_BUSY, MG_TMAX_RST_TO_BUSY);
if (err)
return err;
/* soft reset off */
outb(prv_data->use_polling ? ATA_NIEN : 0,
(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)
{
if (host->req)
if (++host->req->errors >= MG_MAX_ERRORS ||
host->error == MG_ERR_TIMEOUT)
mg_end_request_cur(host, -EIO);
}
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) | ATA_LBA | ATA_DEVICE_OBS),
(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_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)
{
struct mg_host *host = req->rq_disk->private_data;
if (mg_out(host, blk_rq_pos(req), blk_rq_sectors(req),
MG_CMD_RD, NULL) != MG_ERR_NONE)
mg_bad_rw_intr(host);
MG_DBG("requested %d sects (from %ld), buffer=0x%p\n",
blk_rq_sectors(req), blk_rq_pos(req), req->buffer);
do {
if (mg_wait(host, ATA_DRQ,
MG_TMAX_WAIT_RD_DRQ) != MG_ERR_NONE) {
mg_bad_rw_intr(host);
return;
}
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)
{
struct mg_host *host = req->rq_disk->private_data;
unsigned int rem = 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",
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 {
mg_write_one(host, req);
outb(MG_CMD_WR_CONF, (unsigned long)host->dev_base +
MG_REG_COMMAND);
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;
}
} while (mg_end_request(host, 0, MG_SECTOR_SIZE));
}
static void mg_read_intr(struct mg_host *host)
{
struct request *req = host->req;
u32 i;
/* check status */
do {
i = inb((unsigned long)host->dev_base + MG_REG_STATUS);
if (i & ATA_BUSY)
break;
if (!MG_READY_OK(i))
break;
if (i & ATA_DRQ)
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:
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);
/* send read confirm */
outb(MG_CMD_RD_CONF, (unsigned long)host->dev_base + MG_REG_COMMAND);
if (mg_end_request(host, 0, MG_SECTOR_SIZE)) {
/* set handler if read remains */
host->mg_do_intr = mg_read_intr;
mod_timer(&host->timer, jiffies + 3 * HZ);
} else /* goto next request */
mg_request(host->breq);
}
static void mg_write_intr(struct mg_host *host)
{
struct request *req = host->req;
u32 i;
bool rem;
/* check status */
do {
i = inb((unsigned long)host->dev_base + MG_REG_STATUS);
if (i & ATA_BUSY)
break;
if (!MG_READY_OK(i))
break;
if ((blk_rq_sectors(req) <= 1) || (i & ATA_DRQ))
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:
if ((rem = mg_end_request(host, 0, MG_SECTOR_SIZE))) {
/* write 1 sector and set handler if remains */
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;
mod_timer(&host->timer, jiffies + 3 * HZ);
}
/* send write confirm */
outb(MG_CMD_WR_CONF, (unsigned long)host->dev_base + MG_REG_COMMAND);
if (!rem)
mg_request(host->breq);
}
void mg_times_out(unsigned long data)
{
struct mg_host *host = (struct mg_host *)data;
char *name;
spin_lock_irq(&host->lock);
if (!host->req)
goto out_unlock;
host->mg_do_intr = NULL;
name = host->req->rq_disk->disk_name;
printk(KERN_DEBUG "%s: timeout\n", name);
host->error = MG_ERR_TIMEOUT;
mg_bad_rw_intr(host);
out_unlock:
mg_request(host->breq);
spin_unlock_irq(&host->lock);
}
static void mg_request_poll(struct request_queue *q)
{
struct mg_host *host = q->queuedata;
while (1) {
if (!host->req) {
host->req = blk_fetch_request(q);
if (!host->req)
break;
}
if (unlikely(!blk_fs_request(host->req))) {
mg_end_request_cur(host, -EIO);
continue;
}
if (rq_data_dir(host->req) == READ)
mg_read(host->req);
else
mg_write(host->req);
}
}
static unsigned int mg_issue_req(struct request *req,
struct mg_host *host,
unsigned int sect_num,
unsigned int sect_cnt)
{
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(ATA_NIEN, (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, ATA_DRQ, MG_TMAX_WAIT_WR_DRQ);
outb(0, (unsigned long)host->dev_base + MG_REG_DRV_CTRL);
if (host->error) {
mg_bad_rw_intr(host);
return host->error;
}
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);
break;
}
return MG_ERR_NONE;
}
/* This function also called from IRQ context */
static void mg_request(struct request_queue *q)
{
struct mg_host *host = q->queuedata;
struct request *req;
u32 sect_num, sect_cnt;
while (1) {
if (!host->req) {
host->req = blk_fetch_request(q);
if (!host->req)
break;
}
req = host->req;
/* check unwanted request call */
if (host->mg_do_intr)
return;
del_timer(&host->timer);
sect_num = blk_rq_pos(req);
/* deal whole segments */
sect_cnt = blk_rq_sectors(req);
/* 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);
mg_end_request_cur(host, -EIO);
continue;
}
if (unlikely(!blk_fs_request(req))) {
mg_end_request_cur(host, -EIO);
continue;
}
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 const 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(ATA_NIEN, (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(0, (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(0, (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, resource_size(rsc));
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;
}
host->breq->queuedata = host;
/* 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_hw_sectors(host->breq, MG_MAX_SECTS);
blk_queue_logical_block_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");