Any comments? Getting rid of this driver which was never wired up at all would help with some of the pending block work..
On Thu, Apr 06, 2017 at 01:28:46PM +0200, Christoph Hellwig wrote: > This drivers was added in 2008, but as far as a I can tell we never had a > single platform that actually registered resources for the platform driver. > > It's also been unmaintained for a long time and apparently has a ATA mode > that can be driven using the IDE/libata subsystem. > > Signed-off-by: Christoph Hellwig <[email protected]> > --- > Documentation/blockdev/mflash.txt | 84 --- > drivers/block/Kconfig | 17 - > drivers/block/Makefile | 1 - > drivers/block/mg_disk.c | 1110 > ------------------------------------- > include/linux/mg_disk.h | 45 -- > 5 files changed, 1257 deletions(-) > delete mode 100644 Documentation/blockdev/mflash.txt > delete mode 100644 drivers/block/mg_disk.c > delete mode 100644 include/linux/mg_disk.h > > diff --git a/Documentation/blockdev/mflash.txt > b/Documentation/blockdev/mflash.txt > deleted file mode 100644 > index f7e050551487..000000000000 > --- a/Documentation/blockdev/mflash.txt > +++ /dev/null > @@ -1,84 +0,0 @@ > -This document describes m[g]flash support in linux. > - > -Contents > - 1. Overview > - 2. Reserved area configuration > - 3. Example of mflash platform driver registration > - > -1. Overview > - > -Mflash and gflash are embedded flash drive. The only difference is mflash is > -MCP(Multi Chip Package) device. These two device operate exactly same way. > -So the rest mflash repersents mflash and gflash altogether. > - > -Internally, mflash has nand flash and other hardware logics and supports > -2 different operation (ATA, IO) modes. ATA mode doesn't need any new > -driver and currently works well under standard IDE subsystem. Actually it's > -one chip SSD. IO mode is ATA-like custom mode for the host that doesn't have > -IDE interface. > - > -Following are brief descriptions about IO mode. > -A. IO mode based on ATA protocol and uses some custom command. (read confirm, > -write confirm) > -B. IO mode uses SRAM bus interface. > -C. IO mode supports 4kB boot area, so host can boot from mflash. > - > -2. Reserved area configuration > -If host boot from mflash, usually needs raw area for boot loader image. All > of > -the mflash's block device operation will be taken this value as start offset. > -Note that boot loader's size of reserved area and kernel configuration value > -must be same. > - > -3. Example of mflash platform driver registration > -Working mflash is very straight forward. Adding platform device stuff to > board > -configuration file is all. Here is some pseudo example. > - > -static struct mg_drv_data mflash_drv_data = { > - /* If you want to polling driver set to 1 */ > - .use_polling = 0, > - /* device attribution */ > - .dev_attr = MG_BOOT_DEV > -}; > - > -static struct resource mg_mflash_rsc[] = { > - /* Base address of mflash */ > - [0] = { > - .start = 0x08000000, > - .end = 0x08000000 + SZ_64K - 1, > - .flags = IORESOURCE_MEM > - }, > - /* mflash interrupt pin */ > - [1] = { > - .start = IRQ_GPIO(84), > - .end = IRQ_GPIO(84), > - .flags = IORESOURCE_IRQ > - }, > - /* mflash reset pin */ > - [2] = { > - .start = 43, > - .end = 43, > - .name = MG_RST_PIN, > - .flags = IORESOURCE_IO > - }, > - /* mflash reset-out pin > - * If you use mflash as storage device (i.e. other than MG_BOOT_DEV), > - * should assign this */ > - [3] = { > - .start = 51, > - .end = 51, > - .name = MG_RSTOUT_PIN, > - .flags = IORESOURCE_IO > - } > -}; > - > -static struct platform_device mflash_dev = { > - .name = MG_DEV_NAME, > - .id = -1, > - .dev = { > - .platform_data = &mflash_drv_data, > - }, > - .num_resources = ARRAY_SIZE(mg_mflash_rsc), > - .resource = mg_mflash_rsc > -}; > - > -platform_device_register(&mflash_dev); > diff --git a/drivers/block/Kconfig b/drivers/block/Kconfig > index a1c2e816128f..ebe8c1a6195e 100644 > --- a/drivers/block/Kconfig > +++ b/drivers/block/Kconfig > @@ -434,23 +434,6 @@ config ATA_OVER_ETH > This driver provides Support for ATA over Ethernet block > devices like the Coraid EtherDrive (R) Storage Blade. > > -config MG_DISK > - tristate "mGine mflash, gflash support" > - depends on ARM && GPIOLIB > - help > - mGine mFlash(gFlash) block device driver > - > -config MG_DISK_RES > - int "Size of reserved area before MBR" > - depends on MG_DISK > - default 0 > - help > - Define size of reserved area that usually used for boot. Unit is KB. > - All of the block device operation will be taken this value as start > - offset > - Examples: > - 1024 => 1 MB > - > config SUNVDC > tristate "Sun Virtual Disk Client support" > depends on SUN_LDOMS > diff --git a/drivers/block/Makefile b/drivers/block/Makefile > index b12c772bbeb3..5ceead8b52d7 100644 > --- a/drivers/block/Makefile > +++ b/drivers/block/Makefile > @@ -19,7 +19,6 @@ obj-$(CONFIG_BLK_CPQ_CISS_DA) += cciss.o > obj-$(CONFIG_BLK_DEV_DAC960) += DAC960.o > obj-$(CONFIG_XILINX_SYSACE) += xsysace.o > obj-$(CONFIG_CDROM_PKTCDVD) += pktcdvd.o > -obj-$(CONFIG_MG_DISK) += mg_disk.o > obj-$(CONFIG_SUNVDC) += sunvdc.o > obj-$(CONFIG_BLK_DEV_SKD) += skd.o > obj-$(CONFIG_BLK_DEV_OSD) += osdblk.o > diff --git a/drivers/block/mg_disk.c b/drivers/block/mg_disk.c > deleted file mode 100644 > index e88e7b06c616..000000000000 > --- a/drivers/block/mg_disk.c > +++ /dev/null > @@ -1,1110 +0,0 @@ > -/* > - * 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 <[email protected]> > - * > - * 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 <[email protected]>"); > -MODULE_DESCRIPTION("mGine m[g]flash device driver"); > diff --git a/include/linux/mg_disk.h b/include/linux/mg_disk.h > deleted file mode 100644 > index e11f4d9f1c2e..000000000000 > --- a/include/linux/mg_disk.h > +++ /dev/null > @@ -1,45 +0,0 @@ > -/* > - * include/linux/mg_disk.c > - * > - * Private data for mflash platform driver > - * > - * (c) 2008 mGine Co.,LTD > - * (c) 2008 unsik Kim <[email protected]> > - * > - * This program is free software; you can redistribute it and/or modify > - * it under the terms of the GNU General Public License version 2 as > - * published by the Free Software Foundation. > - */ > - > -#ifndef __MG_DISK_H__ > -#define __MG_DISK_H__ > - > -/* name for platform device */ > -#define MG_DEV_NAME "mg_disk" > - > -/* names of GPIO resource */ > -#define MG_RST_PIN "mg_rst" > -/* except MG_BOOT_DEV, reset-out pin should be assigned */ > -#define MG_RSTOUT_PIN "mg_rstout" > - > -/* device attribution */ > -/* use mflash as boot device */ > -#define MG_BOOT_DEV (1 << 0) > -/* use mflash as storage device */ > -#define MG_STORAGE_DEV (1 << 1) > -/* same as MG_STORAGE_DEV, but bootloader already done reset sequence */ > -#define MG_STORAGE_DEV_SKIP_RST (1 << 2) > - > -/* private driver data */ > -struct mg_drv_data { > - /* disk resource */ > - u32 use_polling; > - > - /* device attribution */ > - u32 dev_attr; > - > - /* internally used */ > - void *host; > -}; > - > -#endif > -- > 2.11.0 ---end quoted text---
