diff options
Diffstat (limited to 'drivers/block/mg_disk.c')
| -rw-r--r-- | drivers/block/mg_disk.c | 1014 |
1 files changed, 1014 insertions, 0 deletions
diff --git a/drivers/block/mg_disk.c b/drivers/block/mg_disk.c new file mode 100644 index 000000000000..f3898353d0a8 --- /dev/null +++ b/drivers/block/mg_disk.c @@ -0,0 +1,1014 @@ +/* + * drivers/block/mg_disk.c + * + * Support for the mGine m[g]flash IO mode. + * Based on legacy hd.c + * + * (c) 2008 mGine Co.,LTD + * (c) 2008 unsik Kim <donari75@gmail.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/fs.h> +#include <linux/blkdev.h> +#include <linux/hdreg.h> +#include <linux/libata.h> +#include <linux/interrupt.h> +#include <linux/delay.h> +#include <linux/platform_device.h> +#include <linux/gpio.h> +#include <linux/mg_disk.h> + +#define MG_RES_SEC (CONFIG_MG_DISK_RES << 1) + +static void mg_request(struct request_queue *); + +static void mg_dump_status(const char *msg, unsigned int stat, + struct mg_host *host) +{ + char *name = MG_DISK_NAME; + struct request *req; + + if (host->breq) { + req = elv_next_request(host->breq); + if (req) + name = req->rq_disk->disk_name; + } + + printk(KERN_ERR "%s: %s: status=0x%02x { ", name, msg, stat & 0xff); + if (stat & MG_REG_STATUS_BIT_BUSY) + printk("Busy "); + if (stat & MG_REG_STATUS_BIT_READY) + printk("DriveReady "); + if (stat & MG_REG_STATUS_BIT_WRITE_FAULT) + printk("WriteFault "); + if (stat & MG_REG_STATUS_BIT_SEEK_DONE) + printk("SeekComplete "); + if (stat & MG_REG_STATUS_BIT_DATA_REQ) + printk("DataRequest "); + if (stat & MG_REG_STATUS_BIT_CORRECTED_ERROR) + printk("CorrectedError "); + if (stat & MG_REG_STATUS_BIT_ERROR) + printk("Error "); + printk("}\n"); + if ((stat & MG_REG_STATUS_BIT_ERROR) == 0) { + host->error = 0; + } else { + host->error = inb((unsigned long)host->dev_base + MG_REG_ERROR); + printk(KERN_ERR "%s: %s: error=0x%02x { ", name, msg, + host->error & 0xff); + if (host->error & MG_REG_ERR_BBK) + printk("BadSector "); + if (host->error & MG_REG_ERR_UNC) + printk("UncorrectableError "); + if (host->error & MG_REG_ERR_IDNF) + printk("SectorIdNotFound "); + if (host->error & MG_REG_ERR_ABRT) + printk("DriveStatusError "); + if (host->error & MG_REG_ERR_AMNF) + printk("AddrMarkNotFound "); + printk("}"); + if (host->error & + (MG_REG_ERR_BBK | MG_REG_ERR_UNC | + MG_REG_ERR_IDNF | MG_REG_ERR_AMNF)) { + if (host->breq) { + req = elv_next_request(host->breq); + if (req) + printk(", sector=%u", (u32)req->sector); + } + + } + printk("\n"); + } +} + +static unsigned int mg_wait(struct mg_host *host, u32 expect, u32 msec) +{ + u8 status; + unsigned long expire, cur_jiffies; + struct mg_drv_data *prv_data = host->dev->platform_data; + + host->error = MG_ERR_NONE; + expire = jiffies + msecs_to_jiffies(msec); + + status = inb((unsigned long)host->dev_base + MG_REG_STATUS); + + do { + cur_jiffies = jiffies; + if (status & MG_REG_STATUS_BIT_BUSY) { + if (expect == MG_REG_STATUS_BIT_BUSY) + break; + } else { + /* Check the error condition! */ + if (status & MG_REG_STATUS_BIT_ERROR) { + mg_dump_status("mg_wait", status, host); + break; + } + + if (expect == MG_STAT_READY) + if (MG_READY_OK(status)) + break; + + if (expect == MG_REG_STATUS_BIT_DATA_REQ) + if (status & MG_REG_STATUS_BIT_DATA_REQ) + break; + } + if (!msec) { + mg_dump_status("not ready", status, host); + return MG_ERR_INV_STAT; + } + if (prv_data->use_polling) + msleep(1); + + status = inb((unsigned long)host->dev_base + MG_REG_STATUS); + } while (time_before(cur_jiffies, expire)); + + if (time_after_eq(cur_jiffies, expire) && msec) + host->error = MG_ERR_TIMEOUT; + + return host->error; +} + +static unsigned int mg_wait_rstout(u32 rstout, u32 msec) +{ + unsigned long expire; + + expire = jiffies + msecs_to_jiffies(msec); + while (time_before(jiffies, expire)) { + if (gpio_get_value(rstout) == 1) + return MG_ERR_NONE; + msleep(10); + } + + return MG_ERR_RSTOUT; +} + +static void mg_unexpected_intr(struct mg_host *host) +{ + u32 status = inb((unsigned long)host->dev_base + MG_REG_STATUS); + + mg_dump_status("mg_unexpected_intr", status, host); +} + +static irqreturn_t mg_irq(int irq, void *dev_id) +{ + struct mg_host *host = dev_id; + void (*handler)(struct mg_host *) = host->mg_do_intr; + + 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; +} + +static int mg_get_disk_id(struct mg_host *host) +{ + u32 i; + s32 err; + const u16 *id = host->id; + struct mg_drv_data *prv_data = host->dev->platform_data; + char fwrev[ATA_ID_FW_REV_LEN + 1]; + char model[ATA_ID_PROD_LEN + 1]; + char serial[ATA_ID_SERNO_LEN + 1]; + + if (!prv_data->use_polling) + outb(MG_REG_CTRL_INTR_DISABLE, + (unsigned long)host->dev_base + + MG_REG_DRV_CTRL); + + outb(MG_CMD_ID, (unsigned long)host->dev_base + MG_REG_COMMAND); + err = mg_wait(host, MG_REG_STATUS_BIT_DATA_REQ, MG_TMAX_WAIT_RD_DRQ); + if (err) + return err; + + for (i = 0; i < (MG_SECTOR_SIZE >> 1); i++) + host->id[i] = le16_to_cpu(inw((unsigned long)host->dev_base + + MG_BUFF_OFFSET + i * 2)); + + outb(MG_CMD_RD_CONF, (unsigned long)host->dev_base + MG_REG_COMMAND); + err = mg_wait(host, MG_STAT_READY, MG_TMAX_CONF_TO_CMD); + if (err) + return err; + + if ((id[ATA_ID_FIELD_VALID] & 1) == 0) + return MG_ERR_TRANSLATION; + + host->n_sectors = ata_id_u32(id, ATA_ID_LBA_CAPACITY); + host->cyls = id[ATA_ID_CYLS]; + host->heads = id[ATA_ID_HEADS]; + host->sectors = id[ATA_ID_SECTORS]; + + if (MG_RES_SEC && host->heads && host->sectors) { + /* modify cyls, n_sectors */ + host->cyls = (host->n_sectors - MG_RES_SEC) / + host->heads / host->sectors; + host->nres_sectors = host->n_sectors - host->cyls * + host->heads * host->sectors; + host->n_sectors -= host->nres_sectors; + } + + ata_id_c_string(id, fwrev, ATA_ID_FW_REV, sizeof(fwrev)); + ata_id_c_string(id, model, ATA_ID_PROD, sizeof(model)); + ata_id_c_string(id, serial, ATA_ID_SERNO, sizeof(serial)); + printk(KERN_INFO "mg_disk: model: %s\n", model); + printk(KERN_INFO "mg_disk: firm: %.8s\n", fwrev); + printk(KERN_INFO "mg_disk: serial: %s\n", serial); + printk(KERN_INFO "mg_disk: %d + reserved %d sectors\n", + host->n_sectors, host->nres_sectors); + + if (!prv_data->use_polling) + outb(MG_REG_CTRL_INTR_ENABLE, (unsigned long)host->dev_base + + MG_REG_DRV_CTRL); + + return err; +} + + +static int mg_disk_init(struct mg_host *host) +{ + struct mg_drv_data *prv_data = host->dev->platform_data; + s32 err; + u8 init_status; + + /* hdd rst low */ + gpio_set_value(host->rst, 0); + err = mg_wait(host, MG_REG_STATUS_BIT_BUSY, MG_TMAX_RST_TO_BUSY); + if (err) + return err; + + /* hdd rst high */ + gpio_set_value(host->rst, 1); + err = mg_wait(host, MG_STAT_READY, MG_TMAX_HDRST_TO_RDY); + if (err) + return err; + + /* soft reset on */ + outb(MG_REG_CTRL_RESET | + (prv_data->use_polling ? MG_REG_CTRL_INTR_DISABLE : + MG_REG_CTRL_INTR_ENABLE), + (unsigned long)host->dev_base + MG_REG_DRV_CTRL); + err = mg_wait(host, MG_REG_STATUS_BIT_BUSY, MG_TMAX_RST_TO_BUSY); + if (err) + return err; + + /* soft reset off */ + outb(prv_data->use_polling ? MG_REG_CTRL_INTR_DISABLE : + MG_REG_CTRL_INTR_ENABLE, + (unsigned long)host->dev_base + MG_REG_DRV_CTRL); + err = mg_wait(host, MG_STAT_READY, MG_TMAX_SWRST_TO_RDY); + if (err) + return err; + + init_status = inb((unsigned long)host->dev_base + MG_REG_STATUS) & 0xf; + + if (init_status == 0xf) + return MG_ERR_INIT_STAT; + + return err; +} + +static void mg_bad_rw_intr(struct mg_host *host) +{ + struct request *req = elv_next_request(host->breq); + if (req != NULL) + if (++req->errors >= MG_MAX_ERRORS || + host->error == MG_ERR_TIMEOUT) + end_request(req, 0); +} + +static unsigned int mg_out(struct mg_host *host, + unsigned int sect_num, + unsigned int sect_cnt, + unsigned int cmd, + void (*intr_addr)(struct mg_host *)) +{ + struct mg_drv_data *prv_data = host->dev->platform_data; + + if (mg_wait(host, MG_STAT_READY, MG_TMAX_CONF_TO_CMD)) + return host->error; + + if (!prv_data->use_polling) { + host->mg_do_intr = intr_addr; + mod_timer(&host->timer, jiffies + 3 * HZ); + } + if (MG_RES_SEC) + sect_num += MG_RES_SEC; + outb((u8)sect_cnt, (unsigned long)host->dev_base + MG_REG_SECT_CNT); + outb((u8)sect_num, (unsigned long)host->dev_base + MG_REG_SECT_NUM); + outb((u8)(sect_num >> 8), (unsigned long)host->dev_base + + MG_REG_CYL_LOW); + outb((u8)(sect_num >> 16), (unsigned long)host->dev_base + + MG_REG_CYL_HIGH); + outb((u8)((sect_num >> 24) | MG_REG_HEAD_LBA_MODE), + (unsigned long)host->dev_base + MG_REG_DRV_HEAD); + outb(cmd, (unsigned long)host->dev_base + MG_REG_COMMAND); + return MG_ERR_NONE; +} + +static void mg_read(struct request *req) +{ + u32 remains, j; + struct mg_host *host = req->rq_disk->private_data; + + remains = req->nr_sectors; + + if (mg_out(host, req->sector, req->nr_sectors, MG_CMD_RD, NULL) != + MG_ERR_NONE) + mg_bad_rw_intr(host); + + MG_DBG("requested %d sects (from %ld), buffer=0x%p\n", + remains, req->sector, req->buffer); + + while (remains) { + if (mg_wait(host, MG_REG_STATUS_BIT_DATA_REQ, + MG_TMAX_WAIT_RD_DRQ) != MG_ERR_NONE) { + mg_bad_rw_intr(host); + return; + } + for (j = 0; j < MG_SECTOR_SIZE >> 1; j++) { + *(u16 *)req->buffer = + inw((unsigned long)host->dev_base + + MG_BUFF_OFFSET + (j << 1)); + req->buffer += 2; + } + + req->sector++; + req->errors = 0; + remains = --req->nr_sectors; + --req->current_nr_sectors; + + if (req->current_nr_sectors <= 0) { + MG_DBG("remain : %d sects\n", remains); + end_request(req, 1); + if (remains > 0) + req = elv_next_request(host->breq); + } + + outb(MG_CMD_RD_CONF, (unsigned long)host->dev_base + + MG_REG_COMMAND); + } +} + +static void mg_write(struct request *req) +{ + u32 remains, j; + struct mg_host *host = req->rq_disk->private_data; + + remains = req->nr_sectors; + + if (mg_out(host, req->sector, req->nr_sectors, MG_CMD_WR, NULL) != + MG_ERR_NONE) { + mg_bad_rw_intr(host); + return; + } + + + MG_DBG("requested %d sects (from %ld), buffer=0x%p\n", + remains, req->sector, req->buffer); + while (remains) { + if (mg_wait(host, MG_REG_STATUS_BIT_DATA_REQ, + MG_TMAX_WAIT_WR_DRQ) != MG_ERR_NONE) { + mg_bad_rw_intr(host); + return; + } + for (j = 0; j < MG_SECTOR_SIZE >> 1; j++) { + outw(*(u16 *)req->buffer, + (unsigned long)host->dev_base + + MG_BUFF_OFFSET + (j << 1)); + req->buffer += 2; + } + req->sector++; + remains = --req->nr_sectors; + --req->current_nr_sectors; + + if (req->current_nr_sectors <= 0) { + MG_DBG("remain : %d sects\n", remains); + end_request(req, 1); + if (remains > 0) + req = elv_next_request(host->breq); + } + + outb(MG_CMD_WR_CONF, (unsigned long)host->dev_base + + MG_REG_COMMAND); + } +} + +static void mg_read_intr(struct mg_host *host) +{ + u32 i; + struct request *req; + + /* check status */ + do { + i = inb((unsigned long)host->dev_base + MG_REG_STATUS); + if (i & MG_REG_STATUS_BIT_BUSY) + break; + if (!MG_READY_OK(i)) + break; + if (i & MG_REG_STATUS_BIT_DATA_REQ) + goto ok_to_read; + } while (0); + mg_dump_status("mg_read_intr", i, host); + mg_bad_rw_intr(host); + mg_request(host->breq); + return; + +ok_to_read: + /* get current segment of request */ + req = elv_next_request(host->breq); + + /* read 1 sector */ + for (i = 0; i < MG_SECTOR_SIZE >> 1; i++) { + *(u16 *)req->buffer = + inw((unsigned long)host->dev_base + MG_BUFF_OFFSET + + (i << 1)); + req->buffer += 2; + } + + /* manipulate request */ + MG_DBG("sector %ld, remaining=%ld, buffer=0x%p\n", + req->sector, req->nr_sectors - 1, req->buffer); + + req->sector++; + req->errors = 0; + i = --req->nr_sectors; + --req->current_nr_sectors; + + /* let know if current segment done */ + if (req->current_nr_sectors <= 0) + end_request(req, 1); + + /* set handler if read remains */ + if (i > 0) { + host->mg_do_intr = mg_read_intr; + mod_timer(&host->timer, jiffies + 3 * HZ); + } + + /* send read confirm */ + outb(MG_CMD_RD_CONF, (unsigned long)host->dev_base + MG_REG_COMMAND); + + /* goto next request */ + if (!i) + mg_request(host->breq); +} + +static void mg_write_intr(struct mg_host *host) +{ + u32 i, j; + u16 *buff; + struct request *req; + + /* get current segment of request */ + req = elv_next_request(host->breq); + + /* check status */ + do { + i = inb((unsigned long)host->dev_base + MG_REG_STATUS); + if (i & MG_REG_STATUS_BIT_BUSY) + break; + if (!MG_READY_OK(i)) + break; + if ((req->nr_sectors <= 1) || (i & MG_REG_STATUS_BIT_DATA_REQ)) + goto ok_to_write; + } while (0); + mg_dump_status("mg_write_intr", i, host); + mg_bad_rw_intr(host); + mg_request(host->breq); + return; + +ok_to_write: + /* manipulate request */ + req->sector++; + i = --req->nr_sectors; + --req->current_nr_sectors; + req->buffer += MG_SECTOR_SIZE; + + /* let know if current segment or all done */ + if (!i || (req->bio && req->current_nr_sectors <= 0)) + end_request(req, 1); + + /* write 1 sector and set handler if remains */ + if (i > 0) { + buff = (u16 *)req->buffer; + for (j = 0; j < MG_STORAGE_BUFFER_SIZE >> 1; j++) { + outw(*buff, (unsigned long)host->dev_base + + MG_BUFF_OFFSET + (j << 1)); + buff++; + } + MG_DBG("sector %ld, remaining=%ld, buffer=0x%p\n", + req->sector, req->nr_sectors, req->buffer); + host->mg_do_intr = mg_write_intr; + mod_timer(&host->timer, jiffies + 3 * HZ); + } + + /* send write confirm */ + outb(MG_CMD_WR_CONF, (unsigned long)host->dev_base + MG_REG_COMMAND); + + if (!i) + mg_request(host->breq); +} + +void mg_times_out(unsigned long data) +{ + struct mg_host *host = (struct mg_host *)data; + char *name; + struct request *req; + + spin_lock_irq(&host->lock); + + req = elv_next_request(host->breq); + if (!req) + goto out_unlock; + + host->mg_do_intr = NULL; + + name = req->rq_disk->disk_name; + printk(KERN_DEBUG "%s: timeout\n", name); + + host->error = MG_ERR_TIMEOUT; + mg_bad_rw_intr(host); + + mg_request(host->breq); +out_unlock: + spin_unlock_irq(&host->lock); +} + +static void mg_request_poll(struct request_queue *q) +{ + struct request *req; + struct mg_host *host; + + while ((req = elv_next_request(q)) != NULL) { + host = req->rq_disk->private_data; + if (blk_fs_request(req)) { + switch (rq_data_dir(req)) { + case READ: + mg_read(req); + break; + case WRITE: + mg_write(req); + break; + default: + printk(KERN_WARNING "%s:%d unknown command\n", + __func__, __LINE__); + end_request(req, 0); + break; + } + } + } +} + +static unsigned int mg_issue_req(struct request *req, + struct mg_host *host, + unsigned int sect_num, + unsigned int sect_cnt) +{ + u16 *buff; + u32 i; + + switch (rq_data_dir(req)) { + case READ: + if (mg_out(host, sect_num, sect_cnt, MG_CMD_RD, &mg_read_intr) + != MG_ERR_NONE) { + mg_bad_rw_intr(host); + return host->error; + } + break; + case WRITE: + /* TODO : handler */ + outb(MG_REG_CTRL_INTR_DISABLE, + (unsigned long)host->dev_base + + MG_REG_DRV_CTRL); + if (mg_out(host, sect_num, sect_cnt, MG_CMD_WR, &mg_write_intr) + != MG_ERR_NONE) { + mg_bad_rw_intr(host); + return host->error; + } + del_timer(&host->timer); + mg_wait(host, MG_REG_STATUS_BIT_DATA_REQ, MG_TMAX_WAIT_WR_DRQ); + outb(MG_REG_CTRL_INTR_ENABLE, (unsigned long)host->dev_base + + MG_REG_DRV_CTRL); + if (host->error) { + mg_bad_rw_intr(host); + return host->error; + } + buff = (u16 *)req->buffer; + for (i = 0; i < MG_SECTOR_SIZE >> 1; i++) { + outw(*buff, (unsigned long)host->dev_base + + MG_BUFF_OFFSET + (i << 1)); + buff++; + } + mod_timer(&host->timer, jiffies + 3 * HZ); + outb(MG_CMD_WR_CONF, (unsigned long)host->dev_base + + MG_REG_COMMAND); + break; + default: + printk(KERN_WARNING "%s:%d unknown command\n", + __func__, __LINE__); + end_request(req, 0); + break; + } + return MG_ERR_NONE; +} + +/* This function also called from IRQ context */ +static void mg_request(struct request_queue *q) +{ + struct request *req; + struct mg_host *host; + u32 sect_num, sect_cnt; + + while (1) { + req = elv_next_request(q); + if (!req) + return; + + host = req->rq_disk->private_data; + + /* check unwanted request call */ + if (host->mg_do_intr) + return; + + del_timer(&host->timer); + + sect_num = req->sector; + /* deal whole segments */ + sect_cnt = req->nr_sectors; + + /* sanity check */ + if (sect_num >= get_capacity(req->rq_disk) || + ((sect_num + sect_cnt) > + get_capacity(req->rq_disk))) { + printk(KERN_WARNING + "%s: bad access: sector=%d, count=%d\n", + req->rq_disk->disk_name, + sect_num, sect_cnt); + end_request(req, 0); + continue; + } + + if (!blk_fs_request(req)) + return; + + if (!mg_issue_req(req, host, sect_num, sect_cnt)) + return; + } +} + +static int mg_getgeo(struct block_device *bdev, struct hd_geometry *geo) +{ + struct mg_host *host = bdev->bd_disk->private_data; + + geo->cylinders = (unsigned short)host->cyls; + geo->heads = (unsigned char)host->heads; + geo->sectors = (unsigned char)host->sectors; + return 0; +} + +static struct block_device_operations mg_disk_ops = { + .getgeo = mg_getgeo +}; + +static int mg_suspend(struct platform_device *plat_dev, pm_message_t state) +{ + struct mg_drv_data *prv_data = plat_dev->dev.platform_data; + struct mg_host *host = prv_data->host; + + if (mg_wait(host, MG_STAT_READY, MG_TMAX_CONF_TO_CMD)) + return -EIO; + + if (!prv_data->use_polling) + outb(MG_REG_CTRL_INTR_DISABLE, + (unsigned long)host->dev_base + + MG_REG_DRV_CTRL); + + outb(MG_CMD_SLEEP, (unsigned long)host->dev_base + MG_REG_COMMAND); + /* wait until mflash deep sleep */ + msleep(1); + + if (mg_wait(host, MG_STAT_READY, MG_TMAX_CONF_TO_CMD)) { + if (!prv_data->use_polling) + outb(MG_REG_CTRL_INTR_ENABLE, + (unsigned long)host->dev_base + + MG_REG_DRV_CTRL); + return -EIO; + } + + return 0; +} + +static int mg_resume(struct platform_device *plat_dev) +{ + struct mg_drv_data *prv_data = plat_dev->dev.platform_data; + struct mg_host *host = prv_data->host; + + if (mg_wait(host, MG_STAT_READY, MG_TMAX_CONF_TO_CMD)) + return -EIO; + + outb(MG_CMD_WAKEUP, (unsigned long)host->dev_base + MG_REG_COMMAND); + /* wait until mflash wakeup */ + msleep(1); + + if (mg_wait(host, MG_STAT_READY, MG_TMAX_CONF_TO_CMD)) + return -EIO; + + if (!prv_data->use_polling) + outb(MG_REG_CTRL_INTR_ENABLE, (unsigned long)host->dev_base + + MG_REG_DRV_CTRL); + + return 0; +} + +static int mg_probe(struct platform_device *plat_dev) +{ + struct mg_host *host; + struct resource *rsc; + struct mg_drv_data *prv_data = plat_dev->dev.platform_data; + int err = 0; + + if (!prv_data) { + printk(KERN_ERR "%s:%d fail (no driver_data)\n", + __func__, __LINE__); + err = -EINVAL; + goto probe_err; + } + + /* alloc mg_host */ + host = kzalloc(sizeof(struct mg_host), GFP_KERNEL); + if (!host) { + printk(KERN_ERR "%s:%d fail (no memory for mg_host)\n", + __func__, __LINE__); + err = -ENOMEM; + goto probe_err; + } + host->major = MG_DISK_MAJ; + + /* link each other */ + prv_data->host = host; + host->dev = &plat_dev->dev; + + /* io remap */ + rsc = platform_get_resource(plat_dev, IORESOURCE_MEM, 0); + if (!rsc) { + printk(KERN_ERR "%s:%d platform_get_resource fail\n", + __func__, __LINE__); + err = -EINVAL; + goto probe_err_2; + } + host->dev_base = ioremap(rsc->start , rsc->end + 1); + if (!host->dev_base) { + printk(KERN_ERR "%s:%d ioremap fail\n", + __func__, __LINE__); + err = -EIO; + goto probe_err_2; + } + MG_DBG("dev_base = 0x%x\n", (u32)host->dev_base); + + /* get reset pin */ + rsc = platform_get_resource_byname(plat_dev, IORESOURCE_IO, + MG_RST_PIN); + if (!rsc) { + printk(KERN_ERR "%s:%d get reset pin fail\n", + __func__, __LINE__); + err = -EIO; + goto probe_err_3; + } + host->rst = rsc->start; + + /* init rst pin */ + err = gpio_request(host->rst, MG_RST_PIN); + if (err) + goto probe_err_3; + gpio_direction_output(host->rst, 1); + + /* reset out pin */ + if (!(prv_data->dev_attr & MG_DEV_MASK)) + goto probe_err_3a; + + if (prv_data->dev_attr != MG_BOOT_DEV) { + rsc = platform_get_resource_byname(plat_dev, IORESOURCE_IO, + MG_RSTOUT_PIN); + if (!rsc) { + printk(KERN_ERR "%s:%d get reset-out pin fail\n", + __func__, __LINE__); + err = -EIO; + goto probe_err_3a; + } + host->rstout = rsc->start; + err = gpio_request(host->rstout, MG_RSTOUT_PIN); + if (err) + goto probe_err_3a; + gpio_direction_input(host->rstout); + } + + /* disk reset */ + if (prv_data->dev_attr == MG_STORAGE_DEV) { + /* If POR seq. not yet finised, wait */ + err = mg_wait_rstout(host->rstout, MG_TMAX_RSTOUT); + if (err) + goto probe_err_3b; + err = mg_disk_init(host); + if (err) { + printk(KERN_ERR "%s:%d fail (err code : %d)\n", + __func__, __LINE__, err); + err = -EIO; + goto probe_err_3b; + } + } + + /* get irq resource */ + if (!prv_data->use_polling) { + host->irq = platform_get_irq(plat_dev, 0); + if (host->irq == -ENXIO) { + err = host->irq; + goto probe_err_3b; + } + err = request_irq(host->irq, mg_irq, + IRQF_DISABLED | IRQF_TRIGGER_RISING, + MG_DEV_NAME, host); + if (err) { + printk(KERN_ERR "%s:%d fail (request_irq err=%d)\n", + __func__, __LINE__, err); + goto probe_err_3b; + } + + } + + /* get disk id */ + err = mg_get_disk_id(host); + if (err) { + printk(KERN_ERR "%s:%d fail (err code : %d)\n", + __func__, __LINE__, err); + err = -EIO; + goto probe_err_4; + } + + err = register_blkdev(host->major, MG_DISK_NAME); + if (err < 0) { + printk(KERN_ERR "%s:%d register_blkdev fail (err code : %d)\n", + __func__, __LINE__, err); + goto probe_err_4; + } + if (!host->major) + host->major = err; + + spin_lock_init(&host->lock); + + if (prv_data->use_polling) + host->breq = blk_init_queue(mg_request_poll, &host->lock); + else + host->breq = blk_init_queue(mg_request, &host->lock); + + if (!host->breq) { + err = -ENOMEM; + printk(KERN_ERR "%s:%d (blk_init_queue) fail\n", + __func__, __LINE__); + goto probe_err_5; + } + + /* mflash is random device, thanx for the noop */ + elevator_exit(host->breq->elevator); + err = elevator_init(host->breq, "noop"); + if (err) { + printk(KERN_ERR "%s:%d (elevator_init) fail\n", + __func__, __LINE__); + goto probe_err_6; + } + blk_queue_max_sectors(host->breq, MG_MAX_SECTS); + blk_queue_hardsect_size(host->breq, MG_SECTOR_SIZE); + + init_timer(&host->timer); + host->timer.function = mg_times_out; + host->timer.data = (unsigned long)host; + + host->gd = alloc_disk(MG_DISK_MAX_PART); + if (!host->gd) { + printk(KERN_ERR "%s:%d (alloc_disk) fail\n", + __func__, __LINE__); + err = -ENOMEM; + goto probe_err_7; + } + host->gd->major = host->major; + host->gd->first_minor = 0; + host->gd->fops = &mg_disk_ops; + host->gd->queue = host->breq; + host->gd->private_data = host; + sprintf(host->gd->disk_name, MG_DISK_NAME"a"); + + set_capacity(host->gd, host->n_sectors); + + add_disk(host->gd); + + return err; + +probe_err_7: + del_timer_sync(&host->timer); +probe_err_6: + blk_cleanup_queue(host->breq); +probe_err_5: + unregister_blkdev(MG_DISK_MAJ, MG_DISK_NAME); +probe_err_4: + if (!prv_data->use_polling) + free_irq(host->irq, host); +probe_err_3b: + gpio_free(host->rstout); +probe_err_3a: + gpio_free(host->rst); +probe_err_3: + iounmap(host->dev_base); +probe_err_2: + kfree(host); +probe_err: + return err; +} + +static int mg_remove(struct platform_device *plat_dev) +{ + struct mg_drv_data *prv_data = plat_dev->dev.platform_data; + struct mg_host *host = prv_data->host; + int err = 0; + + /* delete timer */ + del_timer_sync(&host->timer); + + /* remove disk */ + if (host->gd) { + del_gendisk(host->gd); + put_disk(host->gd); + } + /* remove queue */ + if (host->breq) + blk_cleanup_queue(host->breq); + + /* unregister blk device */ + unregister_blkdev(host->major, MG_DISK_NAME); + + /* free irq */ + if (!prv_data->use_polling) + free_irq(host->irq, host); + + /* free reset-out pin */ + if (prv_data->dev_attr != MG_BOOT_DEV) + gpio_free(host->rstout); + + /* free rst pin */ + if (host->rst) + gpio_free(host->rst); + + /* unmap io */ + if (host->dev_base) + iounmap(host->dev_base); + + /* free mg_host */ + kfree(host); + + return err; +} + +static struct platform_driver mg_disk_driver = { + .probe = mg_probe, + .remove = mg_remove, + .suspend = mg_suspend, + .resume = mg_resume, + .driver = { + .name = MG_DEV_NAME, + .owner = THIS_MODULE, + } +}; + +/**************************************************************************** + * + * Module stuff + * + ****************************************************************************/ + +static int __init mg_init(void) +{ + printk(KERN_INFO "mGine mflash driver, (c) 2008 mGine Co.\n"); + return platform_driver_register(&mg_disk_driver); +} + +static void __exit mg_exit(void) +{ + printk(KERN_INFO "mflash driver : bye bye\n"); + platform_driver_unregister(&mg_disk_driver); +} + +module_init(mg_init); +module_exit(mg_exit); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("unsik Kim <donari75@gmail.com>"); +MODULE_DESCRIPTION("mGine m[g]flash device driver"); |