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ebb3727779
Pull block driver updates from Jens Axboe: "It might look big in volume, but when categorized, not a lot of drivers are touched. The pull request contains: - mtip32xx fixes from Micron. - A slew of drbd updates, this time in a nicer series. - bcache, a flash/ssd caching framework from Kent. - Fixes for cciss" * 'for-3.10/drivers' of git://git.kernel.dk/linux-block: (66 commits) bcache: Use bd_link_disk_holder() bcache: Allocator cleanup/fixes cciss: bug fix to prevent cciss from loading in kdump crash kernel cciss: add cciss_allow_hpsa module parameter drivers/block/mg_disk.c: add CONFIG_PM_SLEEP to suspend/resume functions mtip32xx: Workaround for unaligned writes bcache: Make sure blocksize isn't smaller than device blocksize bcache: Fix merge_bvec_fn usage for when it modifies the bvm bcache: Correctly check against BIO_MAX_PAGES bcache: Hack around stuff that clones up to bi_max_vecs bcache: Set ra_pages based on backing device's ra_pages bcache: Take data offset from the bdev superblock. mtip32xx: mtip32xx: Disable TRIM support mtip32xx: fix a smatch warning bcache: Disable broken btree fuzz tester bcache: Fix a format string overflow bcache: Fix a minor memory leak on device teardown bcache: Documentation updates bcache: Use WARN_ONCE() instead of __WARN() bcache: Add missing #include <linux/prefetch.h> ...
1114 lines
26 KiB
C
1114 lines
26 KiB
C
/*
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* drivers/block/mg_disk.c
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*
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* Support for the mGine m[g]flash IO mode.
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* Based on legacy hd.c
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*
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* (c) 2008 mGine Co.,LTD
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* (c) 2008 unsik Kim <donari75@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/fs.h>
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#include <linux/blkdev.h>
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#include <linux/hdreg.h>
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#include <linux/ata.h>
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#include <linux/interrupt.h>
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#include <linux/delay.h>
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#include <linux/platform_device.h>
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#include <linux/gpio.h>
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#include <linux/mg_disk.h>
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#include <linux/slab.h>
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#define MG_RES_SEC (CONFIG_MG_DISK_RES << 1)
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/* name for block device */
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#define MG_DISK_NAME "mgd"
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#define MG_DISK_MAJ 0
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#define MG_DISK_MAX_PART 16
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#define MG_SECTOR_SIZE 512
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#define MG_MAX_SECTS 256
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/* Register offsets */
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#define MG_BUFF_OFFSET 0x8000
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#define MG_REG_OFFSET 0xC000
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#define MG_REG_FEATURE (MG_REG_OFFSET + 2) /* write case */
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#define MG_REG_ERROR (MG_REG_OFFSET + 2) /* read case */
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#define MG_REG_SECT_CNT (MG_REG_OFFSET + 4)
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#define MG_REG_SECT_NUM (MG_REG_OFFSET + 6)
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#define MG_REG_CYL_LOW (MG_REG_OFFSET + 8)
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#define MG_REG_CYL_HIGH (MG_REG_OFFSET + 0xA)
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#define MG_REG_DRV_HEAD (MG_REG_OFFSET + 0xC)
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#define MG_REG_COMMAND (MG_REG_OFFSET + 0xE) /* write case */
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#define MG_REG_STATUS (MG_REG_OFFSET + 0xE) /* read case */
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#define MG_REG_DRV_CTRL (MG_REG_OFFSET + 0x10)
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#define MG_REG_BURST_CTRL (MG_REG_OFFSET + 0x12)
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/* handy status */
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#define MG_STAT_READY (ATA_DRDY | ATA_DSC)
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#define MG_READY_OK(s) (((s) & (MG_STAT_READY | (ATA_BUSY | ATA_DF | \
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ATA_ERR))) == MG_STAT_READY)
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/* error code for others */
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#define MG_ERR_NONE 0
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#define MG_ERR_TIMEOUT 0x100
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#define MG_ERR_INIT_STAT 0x101
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#define MG_ERR_TRANSLATION 0x102
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#define MG_ERR_CTRL_RST 0x103
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#define MG_ERR_INV_STAT 0x104
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#define MG_ERR_RSTOUT 0x105
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#define MG_MAX_ERRORS 6 /* Max read/write errors */
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/* command */
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#define MG_CMD_RD 0x20
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#define MG_CMD_WR 0x30
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#define MG_CMD_SLEEP 0x99
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#define MG_CMD_WAKEUP 0xC3
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#define MG_CMD_ID 0xEC
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#define MG_CMD_WR_CONF 0x3C
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#define MG_CMD_RD_CONF 0x40
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/* operation mode */
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#define MG_OP_CASCADE (1 << 0)
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#define MG_OP_CASCADE_SYNC_RD (1 << 1)
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#define MG_OP_CASCADE_SYNC_WR (1 << 2)
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#define MG_OP_INTERLEAVE (1 << 3)
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/* synchronous */
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#define MG_BURST_LAT_4 (3 << 4)
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#define MG_BURST_LAT_5 (4 << 4)
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#define MG_BURST_LAT_6 (5 << 4)
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#define MG_BURST_LAT_7 (6 << 4)
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#define MG_BURST_LAT_8 (7 << 4)
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#define MG_BURST_LEN_4 (1 << 1)
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#define MG_BURST_LEN_8 (2 << 1)
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#define MG_BURST_LEN_16 (3 << 1)
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#define MG_BURST_LEN_32 (4 << 1)
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#define MG_BURST_LEN_CONT (0 << 1)
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/* timeout value (unit: ms) */
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#define MG_TMAX_CONF_TO_CMD 1
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#define MG_TMAX_WAIT_RD_DRQ 10
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#define MG_TMAX_WAIT_WR_DRQ 500
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#define MG_TMAX_RST_TO_BUSY 10
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#define MG_TMAX_HDRST_TO_RDY 500
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#define MG_TMAX_SWRST_TO_RDY 500
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#define MG_TMAX_RSTOUT 3000
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#define MG_DEV_MASK (MG_BOOT_DEV | MG_STORAGE_DEV | MG_STORAGE_DEV_SKIP_RST)
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/* main structure for mflash driver */
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struct mg_host {
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struct device *dev;
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struct request_queue *breq;
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struct request *req;
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spinlock_t lock;
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struct gendisk *gd;
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struct timer_list timer;
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void (*mg_do_intr) (struct mg_host *);
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u16 id[ATA_ID_WORDS];
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u16 cyls;
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u16 heads;
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u16 sectors;
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u32 n_sectors;
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u32 nres_sectors;
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void __iomem *dev_base;
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unsigned int irq;
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unsigned int rst;
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unsigned int rstout;
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u32 major;
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u32 error;
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};
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/*
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* Debugging macro and defines
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*/
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#undef DO_MG_DEBUG
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#ifdef DO_MG_DEBUG
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# define MG_DBG(fmt, args...) \
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printk(KERN_DEBUG "%s:%d "fmt, __func__, __LINE__, ##args)
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#else /* CONFIG_MG_DEBUG */
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# define MG_DBG(fmt, args...) do { } while (0)
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#endif /* CONFIG_MG_DEBUG */
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static void mg_request(struct request_queue *);
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static bool mg_end_request(struct mg_host *host, int err, unsigned int nr_bytes)
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{
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if (__blk_end_request(host->req, err, nr_bytes))
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return true;
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host->req = NULL;
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return false;
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}
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static bool mg_end_request_cur(struct mg_host *host, int err)
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{
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return mg_end_request(host, err, blk_rq_cur_bytes(host->req));
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}
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static void mg_dump_status(const char *msg, unsigned int stat,
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struct mg_host *host)
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{
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char *name = MG_DISK_NAME;
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if (host->req)
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name = host->req->rq_disk->disk_name;
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printk(KERN_ERR "%s: %s: status=0x%02x { ", name, msg, stat & 0xff);
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if (stat & ATA_BUSY)
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printk("Busy ");
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if (stat & ATA_DRDY)
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printk("DriveReady ");
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if (stat & ATA_DF)
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printk("WriteFault ");
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if (stat & ATA_DSC)
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printk("SeekComplete ");
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if (stat & ATA_DRQ)
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printk("DataRequest ");
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if (stat & ATA_CORR)
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printk("CorrectedError ");
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if (stat & ATA_ERR)
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printk("Error ");
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printk("}\n");
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if ((stat & ATA_ERR) == 0) {
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host->error = 0;
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} else {
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host->error = inb((unsigned long)host->dev_base + MG_REG_ERROR);
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printk(KERN_ERR "%s: %s: error=0x%02x { ", name, msg,
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host->error & 0xff);
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if (host->error & ATA_BBK)
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printk("BadSector ");
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if (host->error & ATA_UNC)
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printk("UncorrectableError ");
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if (host->error & ATA_IDNF)
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printk("SectorIdNotFound ");
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if (host->error & ATA_ABORTED)
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printk("DriveStatusError ");
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if (host->error & ATA_AMNF)
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printk("AddrMarkNotFound ");
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printk("}");
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if (host->error & (ATA_BBK | ATA_UNC | ATA_IDNF | ATA_AMNF)) {
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if (host->req)
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printk(", sector=%u",
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(unsigned int)blk_rq_pos(host->req));
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}
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printk("\n");
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}
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}
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static unsigned int mg_wait(struct mg_host *host, u32 expect, u32 msec)
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{
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u8 status;
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unsigned long expire, cur_jiffies;
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struct mg_drv_data *prv_data = host->dev->platform_data;
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host->error = MG_ERR_NONE;
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expire = jiffies + msecs_to_jiffies(msec);
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/* These 2 times dummy status read prevents reading invalid
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* status. A very little time (3 times of mflash operating clk)
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* is required for busy bit is set. Use dummy read instead of
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* busy wait, because mflash's PLL is machine dependent.
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*/
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if (prv_data->use_polling) {
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status = inb((unsigned long)host->dev_base + MG_REG_STATUS);
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status = inb((unsigned long)host->dev_base + MG_REG_STATUS);
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}
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status = inb((unsigned long)host->dev_base + MG_REG_STATUS);
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do {
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cur_jiffies = jiffies;
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if (status & ATA_BUSY) {
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if (expect == ATA_BUSY)
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break;
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} else {
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/* Check the error condition! */
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if (status & ATA_ERR) {
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mg_dump_status("mg_wait", status, host);
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break;
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}
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if (expect == MG_STAT_READY)
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if (MG_READY_OK(status))
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break;
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if (expect == ATA_DRQ)
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if (status & ATA_DRQ)
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break;
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}
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if (!msec) {
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mg_dump_status("not ready", status, host);
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return MG_ERR_INV_STAT;
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}
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status = inb((unsigned long)host->dev_base + MG_REG_STATUS);
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} while (time_before(cur_jiffies, expire));
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if (time_after_eq(cur_jiffies, expire) && msec)
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host->error = MG_ERR_TIMEOUT;
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return host->error;
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}
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static unsigned int mg_wait_rstout(u32 rstout, u32 msec)
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{
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unsigned long expire;
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expire = jiffies + msecs_to_jiffies(msec);
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while (time_before(jiffies, expire)) {
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if (gpio_get_value(rstout) == 1)
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return MG_ERR_NONE;
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msleep(10);
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}
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return MG_ERR_RSTOUT;
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}
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static void mg_unexpected_intr(struct mg_host *host)
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{
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u32 status = inb((unsigned long)host->dev_base + MG_REG_STATUS);
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mg_dump_status("mg_unexpected_intr", status, host);
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}
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static irqreturn_t mg_irq(int irq, void *dev_id)
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{
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struct mg_host *host = dev_id;
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void (*handler)(struct mg_host *) = host->mg_do_intr;
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spin_lock(&host->lock);
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host->mg_do_intr = NULL;
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del_timer(&host->timer);
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if (!handler)
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handler = mg_unexpected_intr;
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handler(host);
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spin_unlock(&host->lock);
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return IRQ_HANDLED;
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}
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/* local copy of ata_id_string() */
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static void mg_id_string(const u16 *id, unsigned char *s,
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unsigned int ofs, unsigned int len)
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{
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unsigned int c;
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BUG_ON(len & 1);
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while (len > 0) {
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c = id[ofs] >> 8;
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*s = c;
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s++;
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c = id[ofs] & 0xff;
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*s = c;
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s++;
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ofs++;
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len -= 2;
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}
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}
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/* local copy of ata_id_c_string() */
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static void mg_id_c_string(const u16 *id, unsigned char *s,
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unsigned int ofs, unsigned int len)
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{
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unsigned char *p;
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mg_id_string(id, s, ofs, len - 1);
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p = s + strnlen(s, len - 1);
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while (p > s && p[-1] == ' ')
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p--;
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*p = '\0';
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}
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static int mg_get_disk_id(struct mg_host *host)
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{
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u32 i;
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s32 err;
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const u16 *id = host->id;
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struct mg_drv_data *prv_data = host->dev->platform_data;
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char fwrev[ATA_ID_FW_REV_LEN + 1];
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char model[ATA_ID_PROD_LEN + 1];
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char serial[ATA_ID_SERNO_LEN + 1];
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if (!prv_data->use_polling)
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outb(ATA_NIEN, (unsigned long)host->dev_base + MG_REG_DRV_CTRL);
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outb(MG_CMD_ID, (unsigned long)host->dev_base + MG_REG_COMMAND);
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err = mg_wait(host, ATA_DRQ, MG_TMAX_WAIT_RD_DRQ);
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if (err)
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return err;
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for (i = 0; i < (MG_SECTOR_SIZE >> 1); i++)
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host->id[i] = le16_to_cpu(inw((unsigned long)host->dev_base +
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MG_BUFF_OFFSET + i * 2));
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outb(MG_CMD_RD_CONF, (unsigned long)host->dev_base + MG_REG_COMMAND);
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err = mg_wait(host, MG_STAT_READY, MG_TMAX_CONF_TO_CMD);
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if (err)
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return err;
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if ((id[ATA_ID_FIELD_VALID] & 1) == 0)
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return MG_ERR_TRANSLATION;
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host->n_sectors = ata_id_u32(id, ATA_ID_LBA_CAPACITY);
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host->cyls = id[ATA_ID_CYLS];
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host->heads = id[ATA_ID_HEADS];
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host->sectors = id[ATA_ID_SECTORS];
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if (MG_RES_SEC && host->heads && host->sectors) {
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/* modify cyls, n_sectors */
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host->cyls = (host->n_sectors - MG_RES_SEC) /
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host->heads / host->sectors;
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host->nres_sectors = host->n_sectors - host->cyls *
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host->heads * host->sectors;
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host->n_sectors -= host->nres_sectors;
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}
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mg_id_c_string(id, fwrev, ATA_ID_FW_REV, sizeof(fwrev));
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mg_id_c_string(id, model, ATA_ID_PROD, sizeof(model));
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mg_id_c_string(id, serial, ATA_ID_SERNO, sizeof(serial));
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printk(KERN_INFO "mg_disk: model: %s\n", model);
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printk(KERN_INFO "mg_disk: firm: %.8s\n", fwrev);
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printk(KERN_INFO "mg_disk: serial: %s\n", serial);
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printk(KERN_INFO "mg_disk: %d + reserved %d sectors\n",
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host->n_sectors, host->nres_sectors);
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if (!prv_data->use_polling)
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outb(0, (unsigned long)host->dev_base + MG_REG_DRV_CTRL);
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return err;
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}
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static int mg_disk_init(struct mg_host *host)
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{
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struct mg_drv_data *prv_data = host->dev->platform_data;
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s32 err;
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u8 init_status;
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/* hdd rst low */
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gpio_set_value(host->rst, 0);
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err = mg_wait(host, ATA_BUSY, MG_TMAX_RST_TO_BUSY);
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if (err)
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return err;
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/* hdd rst high */
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gpio_set_value(host->rst, 1);
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err = mg_wait(host, MG_STAT_READY, MG_TMAX_HDRST_TO_RDY);
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if (err)
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return err;
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/* soft reset on */
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outb(ATA_SRST | (prv_data->use_polling ? ATA_NIEN : 0),
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(unsigned long)host->dev_base + MG_REG_DRV_CTRL);
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err = mg_wait(host, ATA_BUSY, MG_TMAX_RST_TO_BUSY);
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if (err)
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return err;
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/* soft reset off */
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outb(prv_data->use_polling ? ATA_NIEN : 0,
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(unsigned long)host->dev_base + MG_REG_DRV_CTRL);
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err = mg_wait(host, MG_STAT_READY, MG_TMAX_SWRST_TO_RDY);
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if (err)
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return err;
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init_status = inb((unsigned long)host->dev_base + MG_REG_STATUS) & 0xf;
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if (init_status == 0xf)
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return MG_ERR_INIT_STAT;
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return err;
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}
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static void mg_bad_rw_intr(struct mg_host *host)
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{
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if (host->req)
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if (++host->req->errors >= MG_MAX_ERRORS ||
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host->error == MG_ERR_TIMEOUT)
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mg_end_request_cur(host, -EIO);
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}
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static unsigned int mg_out(struct mg_host *host,
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unsigned int sect_num,
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unsigned int sect_cnt,
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unsigned int cmd,
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void (*intr_addr)(struct mg_host *))
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{
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struct mg_drv_data *prv_data = host->dev->platform_data;
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if (mg_wait(host, MG_STAT_READY, MG_TMAX_CONF_TO_CMD))
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return host->error;
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if (!prv_data->use_polling) {
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host->mg_do_intr = intr_addr;
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mod_timer(&host->timer, jiffies + 3 * HZ);
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}
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if (MG_RES_SEC)
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sect_num += MG_RES_SEC;
|
|
outb((u8)sect_cnt, (unsigned long)host->dev_base + MG_REG_SECT_CNT);
|
|
outb((u8)sect_num, (unsigned long)host->dev_base + MG_REG_SECT_NUM);
|
|
outb((u8)(sect_num >> 8), (unsigned long)host->dev_base +
|
|
MG_REG_CYL_LOW);
|
|
outb((u8)(sect_num >> 16), (unsigned long)host->dev_base +
|
|
MG_REG_CYL_HIGH);
|
|
outb((u8)((sect_num >> 24) | ATA_LBA | ATA_DEVICE_OBS),
|
|
(unsigned long)host->dev_base + MG_REG_DRV_HEAD);
|
|
outb(cmd, (unsigned long)host->dev_base + MG_REG_COMMAND);
|
|
return MG_ERR_NONE;
|
|
}
|
|
|
|
static void mg_read_one(struct mg_host *host, struct request *req)
|
|
{
|
|
u16 *buff = (u16 *)req->buffer;
|
|
u32 i;
|
|
|
|
for (i = 0; i < MG_SECTOR_SIZE >> 1; i++)
|
|
*buff++ = inw((unsigned long)host->dev_base + MG_BUFF_OFFSET +
|
|
(i << 1));
|
|
}
|
|
|
|
static void mg_read(struct request *req)
|
|
{
|
|
struct mg_host *host = req->rq_disk->private_data;
|
|
|
|
if (mg_out(host, blk_rq_pos(req), blk_rq_sectors(req),
|
|
MG_CMD_RD, NULL) != MG_ERR_NONE)
|
|
mg_bad_rw_intr(host);
|
|
|
|
MG_DBG("requested %d sects (from %ld), buffer=0x%p\n",
|
|
blk_rq_sectors(req), blk_rq_pos(req), req->buffer);
|
|
|
|
do {
|
|
if (mg_wait(host, ATA_DRQ,
|
|
MG_TMAX_WAIT_RD_DRQ) != MG_ERR_NONE) {
|
|
mg_bad_rw_intr(host);
|
|
return;
|
|
}
|
|
|
|
mg_read_one(host, req);
|
|
|
|
outb(MG_CMD_RD_CONF, (unsigned long)host->dev_base +
|
|
MG_REG_COMMAND);
|
|
} while (mg_end_request(host, 0, MG_SECTOR_SIZE));
|
|
}
|
|
|
|
static void mg_write_one(struct mg_host *host, struct request *req)
|
|
{
|
|
u16 *buff = (u16 *)req->buffer;
|
|
u32 i;
|
|
|
|
for (i = 0; i < MG_SECTOR_SIZE >> 1; i++)
|
|
outw(*buff++, (unsigned long)host->dev_base + MG_BUFF_OFFSET +
|
|
(i << 1));
|
|
}
|
|
|
|
static void mg_write(struct request *req)
|
|
{
|
|
struct mg_host *host = req->rq_disk->private_data;
|
|
unsigned int rem = blk_rq_sectors(req);
|
|
|
|
if (mg_out(host, blk_rq_pos(req), rem,
|
|
MG_CMD_WR, NULL) != MG_ERR_NONE) {
|
|
mg_bad_rw_intr(host);
|
|
return;
|
|
}
|
|
|
|
MG_DBG("requested %d sects (from %ld), buffer=0x%p\n",
|
|
rem, blk_rq_pos(req), req->buffer);
|
|
|
|
if (mg_wait(host, ATA_DRQ,
|
|
MG_TMAX_WAIT_WR_DRQ) != MG_ERR_NONE) {
|
|
mg_bad_rw_intr(host);
|
|
return;
|
|
}
|
|
|
|
do {
|
|
mg_write_one(host, req);
|
|
|
|
outb(MG_CMD_WR_CONF, (unsigned long)host->dev_base +
|
|
MG_REG_COMMAND);
|
|
|
|
rem--;
|
|
if (rem > 1 && mg_wait(host, ATA_DRQ,
|
|
MG_TMAX_WAIT_WR_DRQ) != MG_ERR_NONE) {
|
|
mg_bad_rw_intr(host);
|
|
return;
|
|
} else if (mg_wait(host, MG_STAT_READY,
|
|
MG_TMAX_WAIT_WR_DRQ) != MG_ERR_NONE) {
|
|
mg_bad_rw_intr(host);
|
|
return;
|
|
}
|
|
} while (mg_end_request(host, 0, MG_SECTOR_SIZE));
|
|
}
|
|
|
|
static void mg_read_intr(struct mg_host *host)
|
|
{
|
|
struct request *req = host->req;
|
|
u32 i;
|
|
|
|
/* check status */
|
|
do {
|
|
i = inb((unsigned long)host->dev_base + MG_REG_STATUS);
|
|
if (i & ATA_BUSY)
|
|
break;
|
|
if (!MG_READY_OK(i))
|
|
break;
|
|
if (i & ATA_DRQ)
|
|
goto ok_to_read;
|
|
} while (0);
|
|
mg_dump_status("mg_read_intr", i, host);
|
|
mg_bad_rw_intr(host);
|
|
mg_request(host->breq);
|
|
return;
|
|
|
|
ok_to_read:
|
|
mg_read_one(host, req);
|
|
|
|
MG_DBG("sector %ld, remaining=%ld, buffer=0x%p\n",
|
|
blk_rq_pos(req), blk_rq_sectors(req) - 1, req->buffer);
|
|
|
|
/* send read confirm */
|
|
outb(MG_CMD_RD_CONF, (unsigned long)host->dev_base + MG_REG_COMMAND);
|
|
|
|
if (mg_end_request(host, 0, MG_SECTOR_SIZE)) {
|
|
/* set handler if read remains */
|
|
host->mg_do_intr = mg_read_intr;
|
|
mod_timer(&host->timer, jiffies + 3 * HZ);
|
|
} else /* goto next request */
|
|
mg_request(host->breq);
|
|
}
|
|
|
|
static void mg_write_intr(struct mg_host *host)
|
|
{
|
|
struct request *req = host->req;
|
|
u32 i;
|
|
bool rem;
|
|
|
|
/* check status */
|
|
do {
|
|
i = inb((unsigned long)host->dev_base + MG_REG_STATUS);
|
|
if (i & ATA_BUSY)
|
|
break;
|
|
if (!MG_READY_OK(i))
|
|
break;
|
|
if ((blk_rq_sectors(req) <= 1) || (i & ATA_DRQ))
|
|
goto ok_to_write;
|
|
} while (0);
|
|
mg_dump_status("mg_write_intr", i, host);
|
|
mg_bad_rw_intr(host);
|
|
mg_request(host->breq);
|
|
return;
|
|
|
|
ok_to_write:
|
|
if ((rem = mg_end_request(host, 0, MG_SECTOR_SIZE))) {
|
|
/* write 1 sector and set handler if remains */
|
|
mg_write_one(host, req);
|
|
MG_DBG("sector %ld, remaining=%ld, buffer=0x%p\n",
|
|
blk_rq_pos(req), blk_rq_sectors(req), req->buffer);
|
|
host->mg_do_intr = mg_write_intr;
|
|
mod_timer(&host->timer, jiffies + 3 * HZ);
|
|
}
|
|
|
|
/* send write confirm */
|
|
outb(MG_CMD_WR_CONF, (unsigned long)host->dev_base + MG_REG_COMMAND);
|
|
|
|
if (!rem)
|
|
mg_request(host->breq);
|
|
}
|
|
|
|
void mg_times_out(unsigned long data)
|
|
{
|
|
struct mg_host *host = (struct mg_host *)data;
|
|
char *name;
|
|
|
|
spin_lock_irq(&host->lock);
|
|
|
|
if (!host->req)
|
|
goto out_unlock;
|
|
|
|
host->mg_do_intr = NULL;
|
|
|
|
name = host->req->rq_disk->disk_name;
|
|
printk(KERN_DEBUG "%s: timeout\n", name);
|
|
|
|
host->error = MG_ERR_TIMEOUT;
|
|
mg_bad_rw_intr(host);
|
|
|
|
out_unlock:
|
|
mg_request(host->breq);
|
|
spin_unlock_irq(&host->lock);
|
|
}
|
|
|
|
static void mg_request_poll(struct request_queue *q)
|
|
{
|
|
struct mg_host *host = q->queuedata;
|
|
|
|
while (1) {
|
|
if (!host->req) {
|
|
host->req = blk_fetch_request(q);
|
|
if (!host->req)
|
|
break;
|
|
}
|
|
|
|
if (unlikely(host->req->cmd_type != REQ_TYPE_FS)) {
|
|
mg_end_request_cur(host, -EIO);
|
|
continue;
|
|
}
|
|
|
|
if (rq_data_dir(host->req) == READ)
|
|
mg_read(host->req);
|
|
else
|
|
mg_write(host->req);
|
|
}
|
|
}
|
|
|
|
static unsigned int mg_issue_req(struct request *req,
|
|
struct mg_host *host,
|
|
unsigned int sect_num,
|
|
unsigned int sect_cnt)
|
|
{
|
|
switch (rq_data_dir(req)) {
|
|
case READ:
|
|
if (mg_out(host, sect_num, sect_cnt, MG_CMD_RD, &mg_read_intr)
|
|
!= MG_ERR_NONE) {
|
|
mg_bad_rw_intr(host);
|
|
return host->error;
|
|
}
|
|
break;
|
|
case WRITE:
|
|
/* TODO : handler */
|
|
outb(ATA_NIEN, (unsigned long)host->dev_base + MG_REG_DRV_CTRL);
|
|
if (mg_out(host, sect_num, sect_cnt, MG_CMD_WR, &mg_write_intr)
|
|
!= MG_ERR_NONE) {
|
|
mg_bad_rw_intr(host);
|
|
return host->error;
|
|
}
|
|
del_timer(&host->timer);
|
|
mg_wait(host, ATA_DRQ, MG_TMAX_WAIT_WR_DRQ);
|
|
outb(0, (unsigned long)host->dev_base + MG_REG_DRV_CTRL);
|
|
if (host->error) {
|
|
mg_bad_rw_intr(host);
|
|
return host->error;
|
|
}
|
|
mg_write_one(host, req);
|
|
mod_timer(&host->timer, jiffies + 3 * HZ);
|
|
outb(MG_CMD_WR_CONF, (unsigned long)host->dev_base +
|
|
MG_REG_COMMAND);
|
|
break;
|
|
}
|
|
return MG_ERR_NONE;
|
|
}
|
|
|
|
/* This function also called from IRQ context */
|
|
static void mg_request(struct request_queue *q)
|
|
{
|
|
struct mg_host *host = q->queuedata;
|
|
struct request *req;
|
|
u32 sect_num, sect_cnt;
|
|
|
|
while (1) {
|
|
if (!host->req) {
|
|
host->req = blk_fetch_request(q);
|
|
if (!host->req)
|
|
break;
|
|
}
|
|
req = host->req;
|
|
|
|
/* check unwanted request call */
|
|
if (host->mg_do_intr)
|
|
return;
|
|
|
|
del_timer(&host->timer);
|
|
|
|
sect_num = blk_rq_pos(req);
|
|
/* deal whole segments */
|
|
sect_cnt = blk_rq_sectors(req);
|
|
|
|
/* sanity check */
|
|
if (sect_num >= get_capacity(req->rq_disk) ||
|
|
((sect_num + sect_cnt) >
|
|
get_capacity(req->rq_disk))) {
|
|
printk(KERN_WARNING
|
|
"%s: bad access: sector=%d, count=%d\n",
|
|
req->rq_disk->disk_name,
|
|
sect_num, sect_cnt);
|
|
mg_end_request_cur(host, -EIO);
|
|
continue;
|
|
}
|
|
|
|
if (unlikely(req->cmd_type != REQ_TYPE_FS)) {
|
|
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 finised, wait */
|
|
err = mg_wait_rstout(host->rstout, MG_TMAX_RSTOUT);
|
|
if (err)
|
|
goto probe_err_3b;
|
|
err = mg_disk_init(host);
|
|
if (err) {
|
|
printk(KERN_ERR "%s:%d fail (err code : %d)\n",
|
|
__func__, __LINE__, err);
|
|
err = -EIO;
|
|
goto probe_err_3b;
|
|
}
|
|
}
|
|
|
|
/* get irq resource */
|
|
if (!prv_data->use_polling) {
|
|
host->irq = platform_get_irq(plat_dev, 0);
|
|
if (host->irq == -ENXIO) {
|
|
err = host->irq;
|
|
goto probe_err_3b;
|
|
}
|
|
err = request_irq(host->irq, mg_irq,
|
|
IRQF_DISABLED | IRQF_TRIGGER_RISING,
|
|
MG_DEV_NAME, host);
|
|
if (err) {
|
|
printk(KERN_ERR "%s:%d fail (request_irq err=%d)\n",
|
|
__func__, __LINE__, err);
|
|
goto probe_err_3b;
|
|
}
|
|
|
|
}
|
|
|
|
/* get disk id */
|
|
err = mg_get_disk_id(host);
|
|
if (err) {
|
|
printk(KERN_ERR "%s:%d fail (err code : %d)\n",
|
|
__func__, __LINE__, err);
|
|
err = -EIO;
|
|
goto probe_err_4;
|
|
}
|
|
|
|
err = register_blkdev(host->major, MG_DISK_NAME);
|
|
if (err < 0) {
|
|
printk(KERN_ERR "%s:%d register_blkdev fail (err code : %d)\n",
|
|
__func__, __LINE__, err);
|
|
goto probe_err_4;
|
|
}
|
|
if (!host->major)
|
|
host->major = err;
|
|
|
|
spin_lock_init(&host->lock);
|
|
|
|
if (prv_data->use_polling)
|
|
host->breq = blk_init_queue(mg_request_poll, &host->lock);
|
|
else
|
|
host->breq = blk_init_queue(mg_request, &host->lock);
|
|
|
|
if (!host->breq) {
|
|
err = -ENOMEM;
|
|
printk(KERN_ERR "%s:%d (blk_init_queue) fail\n",
|
|
__func__, __LINE__);
|
|
goto probe_err_5;
|
|
}
|
|
host->breq->queuedata = host;
|
|
|
|
/* mflash is random device, thanx for the noop */
|
|
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);
|
|
|
|
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,
|
|
.driver = {
|
|
.name = MG_DEV_NAME,
|
|
.owner = THIS_MODULE,
|
|
.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");
|