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Commit 84253394 authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Jens Axboe
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remove the mg_disk driver 

This drivers was added in 2008, but as far as a I can tell we never had a
single platform that actually registered resources for the platform driver.

It's also been unmaintained for a long time and apparently has a ATA mode
that can be driven using the IDE/libata subsystem.
Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: default avatarHannes Reinecke <hare@suse.com>
Signed-off-by: default avatarJens Axboe <axboe@fb.com>
parent 3f19cd23
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Documentation/blockdev/mflash.txt deleted 100644 → 0
View file @ 3f19cd23
This document describes m[g]flash support in linux.
Contents
1. Overview
2. Reserved area configuration
3. Example of mflash platform driver registration
1. Overview
Mflash and gflash are embedded flash drive. The only difference is mflash is
MCP(Multi Chip Package) device. These two device operate exactly same way.
So the rest mflash repersents mflash and gflash altogether.
Internally, mflash has nand flash and other hardware logics and supports
2 different operation (ATA, IO) modes. ATA mode doesn't need any new
driver and currently works well under standard IDE subsystem. Actually it's
one chip SSD. IO mode is ATA-like custom mode for the host that doesn't have
IDE interface.
Following are brief descriptions about IO mode.
A. IO mode based on ATA protocol and uses some custom command. (read confirm,
write confirm)
B. IO mode uses SRAM bus interface.
C. IO mode supports 4kB boot area, so host can boot from mflash.
2. Reserved area configuration
If host boot from mflash, usually needs raw area for boot loader image. All of
the mflash's block device operation will be taken this value as start offset.
Note that boot loader's size of reserved area and kernel configuration value
must be same.
3. Example of mflash platform driver registration
Working mflash is very straight forward. Adding platform device stuff to board
configuration file is all. Here is some pseudo example.
static struct mg_drv_data mflash_drv_data = {
/* If you want to polling driver set to 1 */
.use_polling = 0,
/* device attribution */
.dev_attr = MG_BOOT_DEV
};
static struct resource mg_mflash_rsc[] = {
/* Base address of mflash */
[0] = {
.start = 0x08000000,
.end = 0x08000000 + SZ_64K - 1,
.flags = IORESOURCE_MEM
},
/* mflash interrupt pin */
[1] = {
.start = IRQ_GPIO(84),
.end = IRQ_GPIO(84),
.flags = IORESOURCE_IRQ
},
/* mflash reset pin */
[2] = {
.start = 43,
.end = 43,
.name = MG_RST_PIN,
.flags = IORESOURCE_IO
},
/* mflash reset-out pin
* If you use mflash as storage device (i.e. other than MG_BOOT_DEV),
* should assign this */
[3] = {
.start = 51,
.end = 51,
.name = MG_RSTOUT_PIN,
.flags = IORESOURCE_IO
}
};
static struct platform_device mflash_dev = {
.name = MG_DEV_NAME,
.id = -1,
.dev = {
.platform_data = &mflash_drv_data,
},
.num_resources = ARRAY_SIZE(mg_mflash_rsc),
.resource = mg_mflash_rsc
};
platform_device_register(&mflash_dev);
drivers/block/Kconfig
View file @ 84253394
......@@ -434,23 +434,6 @@ config ATA_OVER_ETH
This driver provides Support for ATA over Ethernet block
devices like the Coraid EtherDrive (R) Storage Blade.
config MG_DISK
tristate "mGine mflash, gflash support"
depends on ARM && GPIOLIB
help
mGine mFlash(gFlash) block device driver
config MG_DISK_RES
int "Size of reserved area before MBR"
depends on MG_DISK
default 0
help
Define size of reserved area that usually used for boot. Unit is KB.
All of the block device operation will be taken this value as start
offset
Examples:
1024 => 1 MB
config SUNVDC
tristate "Sun Virtual Disk Client support"
depends on SUN_LDOMS
......
drivers/block/Makefile
View file @ 84253394
......@@ -19,7 +19,6 @@ obj-$(CONFIG_BLK_CPQ_CISS_DA) += cciss.o
obj-$(CONFIG_BLK_DEV_DAC960) += DAC960.o
obj-$(CONFIG_XILINX_SYSACE) += xsysace.o
obj-$(CONFIG_CDROM_PKTCDVD) += pktcdvd.o
obj-$(CONFIG_MG_DISK) += mg_disk.o
obj-$(CONFIG_SUNVDC) += sunvdc.o
obj-$(CONFIG_BLK_DEV_SKD) += skd.o
obj-$(CONFIG_BLK_DEV_OSD) += osdblk.o
......
drivers/block/mg_disk.c deleted 100644 → 0
View file @ 3f19cd23
/*
* 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 *)bio_data(req->bio);
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), bio_data(req->bio));
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 *)bio_data(req->bio);
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), bio_data(req->bio));
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, bio_data(req->bio));
/* 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), bio_data(req->bio));
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);
}
static 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;
}
switch (req_op(host->req)) {
case REQ_OP_READ:
mg_read(host->req);
break;
case REQ_OP_WRITE:
mg_write(host->req);
break;
default:
mg_end_request_cur(host, -EIO);
break;
}
}
}
static unsigned int mg_issue_req(struct request *req,
struct mg_host *host,
unsigned int sect_num,
unsigned int sect_cnt)
{
switch (req_op(host->req)) {
case REQ_OP_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 REQ_OP_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;
default:
mg_end_request_cur(host, -EIO);
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 (!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
};
#ifdef CONFIG_PM_SLEEP
static int mg_suspend(struct device *dev)
{
struct mg_drv_data *prv_data = 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 device *dev)
{
struct mg_drv_data *prv_data = 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;
}
#endif
static SIMPLE_DEV_PM_OPS(mg_pm, mg_suspend, mg_resume);
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)) {
err = -EINVAL;
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 finished, 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_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 */
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_hw_sectors(host->breq, MG_MAX_SECTS);
blk_queue_logical_block_size(host->breq, MG_SECTOR_SIZE);
setup_timer(&host->timer, mg_times_out, (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(host->major, 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,
.driver = {
.name = MG_DEV_NAME,
.pm = &mg_pm,
}
};
/****************************************************************************
*
* 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");
include/linux/mg_disk.h deleted 100644 → 0
View file @ 3f19cd23
/*
* include/linux/mg_disk.c
*
* Private data for mflash platform driver
*
* (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.
*/
#ifndef __MG_DISK_H__
#define __MG_DISK_H__
/* name for platform device */
#define MG_DEV_NAME "mg_disk"
/* 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"
/* 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)
/* private driver data */
struct mg_drv_data {
/* disk resource */
u32 use_polling;
/* device attribution */
u32 dev_attr;
/* internally used */
void *host;
};
#endif
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