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Date: Mon, 5 Jan 2009 18:30:57 +0900
From: "unsik Kim" <donari75@...il.com>
To: "Heikki Orsila" <shdl@...alwe.fi>
Cc: linux-kernel@...r.kernel.org, akpm@...ux-foundation.org
Subject: Re: [PATCH] mflash linux support
You are right. I fixed style issues.
Thanks a lot.
following is new patches.
Signed-off-by: unsik Kim <donari75@...il.com>
---
6 0 drivers/block/Kconfig
2 0 drivers/block/Makefile
923 0 drivers/block/mg_disk.c
174 0 include/linux/mg_disk.h
drivers/block/Kconfig | 6 +
drivers/block/Makefile | 2 +
drivers/block/mg_disk.c | 923 +++++++++++++++++++++++++++++++++++++++++++++++
include/linux/mg_disk.h | 174 +++++++++
4 files changed, 1105 insertions(+), 0 deletions(-)
diff --git a/drivers/block/Kconfig b/drivers/block/Kconfig
index 0344a8a..cad48c8 100644
--- a/drivers/block/Kconfig
+++ b/drivers/block/Kconfig
@@ -403,6 +403,12 @@ 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
+ help
+ mGine mFlash(gFlash) block device driver
+
config SUNVDC
tristate "Sun Virtual Disk Client support"
depends on SUN_LDOMS
diff --git a/drivers/block/Makefile b/drivers/block/Makefile
index 204332b..1694d45 100644
--- a/drivers/block/Makefile
+++ b/drivers/block/Makefile
@@ -32,3 +32,5 @@ obj-$(CONFIG_BLK_DEV_UB) += ub.o
obj-$(CONFIG_BLK_DEV_HD) += hd.o
obj-$(CONFIG_XEN_BLKDEV_FRONTEND) += xen-blkfront.o
+
+obj-$(CONFIG_MG_DISK) += mg_disk.o
diff --git a/drivers/block/mg_disk.c b/drivers/block/mg_disk.c
new file mode 100644
index 0000000..24edc9a
--- /dev/null
+++ b/drivers/block/mg_disk.c
@@ -0,0 +1,923 @@
+/*
+ * 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@...il.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/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/mg_disk.h>
+
+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("%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(host->dev_base + MG_REG_ERROR);
+ printk("%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;
+ u64 expire, cur_jiffies;
+
+ host->error = MG_ERR_NONE;
+ expire = get_jiffies_64() + msecs_to_jiffies(msec);
+
+ status = inb(host->dev_base + MG_REG_STATUS);
+ do {
+ cur_jiffies = get_jiffies_64();
+ 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;
+ }
+ }
+ }
+ status = inb(host->dev_base + MG_REG_STATUS);
+ } while (cur_jiffies < expire);
+
+ if (cur_jiffies >= expire) {
+ host->error = MG_ERR_TIMEOUT;
+ }
+
+ return host->error;
+}
+
+static void mg_unexpected_intr(struct mg_host *host)
+{
+ u32 status = inb(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 void mg_fix_disk_id(u16 *id)
+{
+#ifndef __LITTLE_ENDIAN
+# ifdef __BIG_ENDIAN
+ int i;
+
+ for (i = 0; i < 256; i++)
+ id[i] = __le16_to_cpu(id[i]);
+# else
+# error "Please fix <asm/byteorder.h>"
+# endif
+#endif
+}
+
+static void mg_ide_fixstring(u8 *s, const int bytecount, const int byteswap)
+{
+ u8 *p, *end = &s[bytecount & ~1]; /* bytecount must be even */
+
+ if (byteswap) {
+ /* convert from big-endian to host byte order */
+ for (p = s ; p != end ; p += 2)
+ be16_to_cpus((u16 *) p);
+ }
+
+ /* strip leading blanks */
+ p = s;
+ while (s != end && *s == ' ')
+ ++s;
+ /* compress internal blanks and strip trailing blanks */
+ while (s != end && *s) {
+ if (*s++ != ' ' || (s != end && *s && *s != ' '))
+ *p++ = *(s-1);
+ }
+ /* wipe out trailing garbage */
+ while (p != end)
+ *p++ = '\0';
+}
+
+static int mg_get_disk_id(struct mg_host *host)
+{
+ u32 i;
+ s32 err;
+ u16 *id = (u16 *)&host->id_data;
+ struct mg_drv_data *prv_data = host->dev->platform_data;
+
+ if (!prv_data->use_polling) {
+ outb(MG_REG_CTRL_INTR_DISABLE, host->dev_base + MG_REG_DRV_CTRL);
+ }
+
+ outb(MG_CMD_ID, host->dev_base + MG_REG_COMMAND);
+ err = mg_wait(host, MG_REG_STATUS_BIT_DATA_REQ, 3000);
+ if (!err) {
+ for (i = 0; i < (MG_SECTOR_SIZE >> 1); i++)
+ id[i] = inw(host->dev_base + MG_BUFF_OFFSET + i * 2);
+
+ outb(MG_CMD_RD_CONF, host->dev_base + MG_REG_COMMAND);
+ err = mg_wait(host, MG_STAT_READY, 3000);
+ if (!err) {
+ mg_fix_disk_id(id);
+ if ((host->id_data.field_valid & 1) == 0) {
+ err = MG_ERR_TRANSLATION;
+ } else {
+#ifdef __BIG_ENDIAN
+ host->id_data.lba_capacity = (host->id_data.lba_capacity << 16) |
(host->id_data.lba_capacity >> 16);
+#endif /* __BIG_ENDIAN */
+ host->tot_sectors = host->id_data.lba_capacity;
+ mg_ide_fixstring(host->id_data.model, sizeof(host->id_data.model), 1);
+ mg_ide_fixstring(host->id_data.serial_no,
sizeof(host->id_data.serial_no), 1);
+ mg_ide_fixstring(host->id_data.fw_rev, sizeof(host->id_data.fw_rev), 1);
+ printk(KERN_INFO "mg_disk: model: %s\n", host->id_data.model);
+ printk(KERN_INFO "mg_disk: firm: %.8s\n", host->id_data.fw_rev);
+ printk(KERN_INFO "mg_disk: serial: %s\n", host->id_data.serial_no);
+ printk(KERN_INFO "mg_disk: %d sectors\n", host->tot_sectors);
+ }
+ }
+ }
+
+ if (!prv_data->use_polling) {
+ outb(MG_REG_CTRL_INTR_ENABLE, 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;
+
+ /* init ctrl pin */
+ if (prv_data->mg_ctrl_pin_init)
+ prv_data->mg_ctrl_pin_init();
+
+ if (!prv_data->mg_hdrst_pin)
+ return MG_ERR_CTRL_RST;
+
+ /* hdd rst low */
+ prv_data->mg_hdrst_pin(0);
+ err = mg_wait(host, MG_REG_STATUS_BIT_BUSY, 300);
+ if (err)
+ return err;
+
+ /* hdd rst high */
+ prv_data->mg_hdrst_pin(1);
+ err = mg_wait(host, MG_STAT_READY, 3000);
+ 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),
+ host->dev_base + MG_REG_DRV_CTRL);
+ err = mg_wait(host, MG_REG_STATUS_BIT_BUSY, 3000);
+ if (err)
+ return err;
+
+ /* soft reset off */
+ outb(prv_data->use_polling ? MG_REG_CTRL_INTR_DISABLE :
MG_REG_CTRL_INTR_ENABLE,
+ host->dev_base + MG_REG_DRV_CTRL);
+ err = mg_wait(host, MG_STAT_READY, 3000);
+ if (err)
+ return err;
+
+ init_status = inb(host->dev_base + MG_REG_STATUS) & 0xf;
+
+ if (init_status == 0xf)
+ return MG_ERR_INIT_STAT;
+
+ if (prv_data->op_mode & (MG_OP_CASCADE_SYNC_RD | MG_OP_CASCADE_SYNC_WR)) {
+ outb(prv_data->burst_latcy | prv_data->burst_len, host->dev_base +
MG_REG_BURST_CTRL);
+ }
+
+ 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) {
+ end_request(req, 0);
+ } else if (req->errors % MG_RESET_FREQ == 0 || host->error ==
MG_ERR_TIMEOUT) {
+ host->reset = 1;
+ }
+ /* Otherwise just retry */
+ }
+}
+
+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, 3000)) {
+ return host->error;
+ }
+
+ if (!prv_data->use_polling) {
+ host->mg_do_intr = intr_addr;
+ mod_timer(&host->timer, jiffies + 3 * HZ);
+ }
+ outb((u8)sect_cnt, host->dev_base + MG_REG_SECT_CNT);
+ outb((u8)sect_num, host->dev_base + MG_REG_SECT_NUM);
+ outb((u8)(sect_num >> 8), host->dev_base + MG_REG_CYL_LOW);
+ outb((u8)(sect_num >> 16), host->dev_base + MG_REG_CYL_HIGH);
+ outb((u8)((sect_num >> 24) | MG_REG_HEAD_LBA_MODE), host->dev_base +
MG_REG_DRV_HEAD);
+ outb(cmd, 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 (host->reset) {
+ if (mg_disk_init(host)) {
+ end_request(req, 0);
+ return;
+ }
+ host->reset = 0;
+ }
+
+ 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, 3000) != MG_ERR_NONE) {
+ mg_bad_rw_intr(host);
+ return;
+ }
+ for (j = 0; j < MG_SECTOR_SIZE >> 1; j++) {
+ *(u16 *)req->buffer = inw(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, 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 (host->reset) {
+ if (mg_disk_init(host)) {
+ end_request(req, 0);
+ return;
+ }
+ host->reset = 0;
+ }
+
+ 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, 3000) != MG_ERR_NONE) {
+ mg_bad_rw_intr(host);
+ return;
+ }
+ for (j = 0; j < MG_SECTOR_SIZE >> 1; j++) {
+ outw(*(u16 *)req->buffer, 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, 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(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(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, 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(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, 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, 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("%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, 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, 3000);
+ outb(MG_REG_CTRL_INTR_ENABLE, 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, host->dev_base + MG_BUFF_OFFSET + (i << 1));
+ buff++;
+ }
+ mod_timer(&host->timer, jiffies + 3 * HZ);
+ outb(MG_CMD_WR_CONF, 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);
+
+ if (host->reset) {
+ if (mg_disk_init(host)) {
+ end_request(req, 0);
+ return;
+ }
+ host->reset = 0;
+ }
+
+ 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_ioctl(struct block_device *bdev, fmode_t fmode,
unsigned cmd, unsigned long arg)
+{
+ struct hd_geometry geo;
+ struct mg_host *host = bdev->bd_disk->private_data;
+
+ switch (cmd) {
+ case HDIO_GETGEO:
+ if (!access_ok(VERIFY_WRITE, arg, sizeof(geo))) {
+ return -EFAULT;
+ }
+
+ geo.cylinders = host->id_data.cyls;
+ geo.heads = host->id_data.heads;
+ geo.sectors = host->id_data.sectors;
+ geo.start = get_start_sect(bdev);
+
+ if (copy_to_user((void *)arg, &geo, sizeof(geo)))
+ return -EFAULT;
+
+ return 0;
+ }
+
+ return -ENOTTY;
+}
+
+static int mg_open(struct block_device *bd, fmode_t fmode)
+{
+ return 0;
+}
+
+static int mg_release(struct gendisk *gendisk, fmode_t fmode)
+{
+ return 0;
+}
+
+static struct block_device_operations mg_disk_ops = {
+ .owner = THIS_MODULE,
+ .open = mg_open,
+ .release = mg_release,
+ .ioctl = mg_ioctl
+};
+
+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 = kmalloc(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;
+ }
+ memset(host, 0, sizeof(struct mg_host));
+ 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);
+
+ /* disk init */
+ 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_3;
+ }
+
+ /* 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_3;
+ }
+ 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_3;
+ }
+
+ }
+
+ /* 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;
+ }
+ err = 0;
+ 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 = MG_DISK_MAJ;
+ 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->tot_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_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);
+
+ /* unmap io */
+ if (host->dev_base)
+ iounmap(host->dev_base);
+
+ /* free mg_host */
+ if (host)
+ kfree(host);
+
+ return err;
+}
+
+static struct platform_driver mg_disk_driver = {
+ .probe = mg_probe,
+ .remove = mg_remove,
+ .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@...il.com>");
+MODULE_DESCRIPTION("mGine m[g]flash device driver");
diff --git a/include/linux/mg_disk.h b/include/linux/mg_disk.h
new file mode 100644
index 0000000..4e5701a
--- /dev/null
+++ b/include/linux/mg_disk.h
@@ -0,0 +1,174 @@
+/*
+ * include/linux/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@...il.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__
+
+#include <linux/blkdev.h>
+#include <linux/hdreg.h>
+
+/* name for block device */
+#define MG_DISK_NAME "mgd"
+/* name for platform device */
+#define MG_DEV_NAME "mg_disk"
+
+#define MG_DISK_MAJ 240
+#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_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_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)
+
+/* "Drive Select/Head Register" bit values */
+#define MG_REG_HEAD_MUST_BE_ON 0xA0 /* These 2 bits are always on */
+#define MG_REG_HEAD_DRIVE_MASTER (0x00 | MG_REG_HEAD_MUST_BE_ON)
+#define MG_REG_HEAD_DRIVE_SLAVE (0x10 | MG_REG_HEAD_MUST_BE_ON)
+#define MG_REG_HEAD_LBA_MODE (0x40 | MG_REG_HEAD_MUST_BE_ON)
+
+
+/* "Device Control Register" bit values */
+#define MG_REG_CTRL_INTR_ENABLE 0x0
+#define MG_REG_CTRL_INTR_DISABLE (0x1<<1)
+#define MG_REG_CTRL_RESET (0x1<<2)
+#define MG_REG_CTRL_INTR_POLA_ACTIVE_HIGH 0x0
+#define MG_REG_CTRL_INTR_POLA_ACTIVE_LOW (0x1<<4)
+#define MG_REG_CTRL_DPD_POLA_ACTIVE_LOW 0x0
+#define MG_REG_CTRL_DPD_POLA_ACTIVE_HIGH (0x1<<5)
+#define MG_REG_CTRL_DPD_DISABLE 0x0
+#define MG_REG_CTRL_DPD_ENABLE (0x1<<6)
+
+/* Status register bit */
+#define MG_REG_STATUS_BIT_ERROR 0x01 /* error bit in status register */
+#define MG_REG_STATUS_BIT_CORRECTED_ERROR 0x04 /* corrected error in
status register */
+#define MG_REG_STATUS_BIT_DATA_REQ 0x08 /* data request bit in
status register */
+#define MG_REG_STATUS_BIT_SEEK_DONE 0x10 /* DSC - Drive Seek Complete */
+#define MG_REG_STATUS_BIT_WRITE_FAULT 0x20 /* DWF - Drive Write Fault */
+#define MG_REG_STATUS_BIT_READY 0x40
+#define MG_REG_STATUS_BIT_BUSY 0x80
+
+/* handy status */
+#define MG_STAT_READY (MG_REG_STATUS_BIT_READY | MG_REG_STATUS_BIT_SEEK_DONE)
+#define MG_READY_OK(s) (((s) & (MG_STAT_READY | \
+ (MG_REG_STATUS_BIT_BUSY | MG_REG_STATUS_BIT_WRITE_FAULT |
MG_REG_STATUS_BIT_ERROR))) \
+ == MG_STAT_READY)
+
+/* Error register */
+#define MG_REG_ERR_AMNF 0x01
+#define MG_REG_ERR_ABRT 0x04
+#define MG_REG_ERR_IDNF 0x10
+#define MG_REG_ERR_UNC 0x40
+#define MG_REG_ERR_BBK 0x80
+
+/* 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_MAX_ERRORS 16 /* Max read/write errors/sector */
+#define MG_RESET_FREQ 4 /* Reset controller every 4th retry */
+
+/* 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
+
+/* private driver data */
+struct mg_drv_data {
+ /* disk resource */
+ u32 nr_chips;
+ u32 op_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)
+
+ u32 use_polling;
+
+ /* synchronous mode */
+ u16 burst_latcy;
+#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)
+ u16 burst_len;
+#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)
+
+ /* control pin resource */
+ int (*mg_ctrl_pin_init) (void); /* initialize hdrst, wd, dpd pin to
GPIO and output high */
+ void (*mg_hdrst_pin) (u8 level);
+ void (*mg_wp_pin) (u8 level);
+ void (*mg_dpd_pin) (u8 level);
+
+ /* internally used */
+ struct mg_host *host;
+};
+
+/* main structure for mflash driver */
+struct mg_host {
+ struct device *dev;
+
+ struct request_queue *breq;
+ spinlock_t lock;
+ struct gendisk *gd;
+
+ struct timer_list timer;
+ void (*mg_do_intr) (struct mg_host *);
+
+ struct hd_driveid id_data;
+ u32 tot_sectors;
+
+ void __iomem *dev_base;
+ unsigned int irq;
+
+ u32 major;
+ u32 error;
+ u32 reset;
+};
+
+/*
+ * 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 */
+
+#endif
--
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