+++ /dev/null
-/*
- * 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");
projects / kernel.git / commitdiff