--- /dev/null
+/*
+ * linux/drivers/scsi/ide-scsi.c Version 0.9 Jul 4, 1999
+ *
+ * Copyright (C) 1996 - 1999 Gadi Oxman <gadio@netvision.net.il>
+ */
+
+/*
+ * Emulation of a SCSI host adapter for IDE ATAPI devices.
+ *
+ * With this driver, one can use the Linux SCSI drivers instead of the
+ * native IDE ATAPI drivers.
+ *
+ * Ver 0.1 Dec 3 96 Initial version.
+ * Ver 0.2 Jan 26 97 Fixed bug in cleanup_module() and added emulation
+ * of MODE_SENSE_6/MODE_SELECT_6 for cdroms. Thanks
+ * to Janos Farkas for pointing this out.
+ * Avoid using bitfields in structures for m68k.
+ * Added Scatter/Gather and DMA support.
+ * Ver 0.4 Dec 7 97 Add support for ATAPI PD/CD drives.
+ * Use variable timeout for each command.
+ * Ver 0.5 Jan 2 98 Fix previous PD/CD support.
+ * Allow disabling of SCSI-6 to SCSI-10 transformation.
+ * Ver 0.6 Jan 27 98 Allow disabling of SCSI command translation layer
+ * for access through /dev/sg.
+ * Fix MODE_SENSE_6/MODE_SELECT_6/INQUIRY translation.
+ * Ver 0.7 Dec 04 98 Ignore commands where lun != 0 to avoid multiple
+ * detection of devices with CONFIG_SCSI_MULTI_LUN
+ * Ver 0.8 Feb 05 99 Optical media need translation too. Reverse 0.7.
+ * Ver 0.9 Jul 04 99 Fix a bug in SG_SET_TRANSFORM.
+ * Ver 0.91 Jun 10 02 Fix "off by one" error in transforms
+ */
+
+#define IDESCSI_VERSION "0.9"
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/string.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/ioport.h>
+#include <linux/blkdev.h>
+#include <linux/errno.h>
+#include <linux/hdreg.h>
+#include <linux/slab.h>
+#include <linux/ide.h>
+
+#include <asm/io.h>
+#include <asm/bitops.h>
+#include <asm/uaccess.h>
+
+#include "scsi.h"
+#include "hosts.h"
+#include "sd.h"
+#include <scsi/sg.h>
+
+#define IDESCSI_DEBUG_LOG 0
+
+typedef struct idescsi_pc_s {
+ u8 c[12]; /* Actual packet bytes */
+ int request_transfer; /* Bytes to transfer */
+ int actually_transferred; /* Bytes actually transferred */
+ int buffer_size; /* Size of our data buffer */
+ struct request *rq; /* The corresponding request */
+ byte *buffer; /* Data buffer */
+ byte *current_position; /* Pointer into the above buffer */
+ struct scatterlist *sg; /* Scatter gather table */
+ int b_count; /* Bytes transferred from current entry */
+ Scsi_Cmnd *scsi_cmd; /* SCSI command */
+ void (*done)(Scsi_Cmnd *); /* Scsi completion routine */
+ unsigned long flags; /* Status/Action flags */
+ unsigned long timeout; /* Command timeout */
+} idescsi_pc_t;
+
+/*
+ * Packet command status bits.
+ */
+#define PC_DMA_IN_PROGRESS 0 /* 1 while DMA in progress */
+#define PC_WRITING 1 /* Data direction */
+#define PC_TRANSFORM 2 /* transform SCSI commands */
+
+/*
+ * SCSI command transformation layer
+ */
+#define IDESCSI_TRANSFORM 0 /* Enable/Disable transformation */
+#define IDESCSI_SG_TRANSFORM 1 /* /dev/sg transformation */
+
+/*
+ * Log flags
+ */
+#define IDESCSI_LOG_CMD 0 /* Log SCSI commands */
+
+typedef struct {
+ ide_drive_t *drive;
+ idescsi_pc_t *pc; /* Current packet command */
+ unsigned long flags; /* Status/Action flags */
+ unsigned long transform; /* SCSI cmd translation layer */
+ unsigned long log; /* log flags */
+} idescsi_scsi_t;
+
+/*
+ * Per ATAPI device status bits.
+ */
+#define IDESCSI_DRQ_INTERRUPT 0 /* DRQ interrupt device */
+
+/*
+ * ide-scsi requests.
+ */
+#define IDESCSI_PC_RQ 90
+
+/*
+ * Bits of the interrupt reason register.
+ */
+#define IDESCSI_IREASON_COD 0x1 /* Information transferred is command */
+#define IDESCSI_IREASON_IO 0x2 /* The device requests us to read */
+
+static void idescsi_discard_data (ide_drive_t *drive, unsigned int bcount)
+{
+ while (bcount--)
+ IN_BYTE (IDE_DATA_REG);
+}
+
+static void idescsi_output_zeros (ide_drive_t *drive, unsigned int bcount)
+{
+ while (bcount--)
+ OUT_BYTE (0, IDE_DATA_REG);
+}
+
+/*
+ * PIO data transfer routines using the scatter gather table.
+ */
+static void idescsi_input_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigned int bcount)
+{
+ int count;
+ char *buf;
+
+ while (bcount) {
+ if (pc->sg - (struct scatterlist *) pc->scsi_cmd->request_buffer > pc->scsi_cmd->use_sg) {
+ printk (KERN_ERR "ide-scsi: scatter gather table too small, discarding data\n");
+ idescsi_discard_data (drive, bcount);
+ return;
+ }
+ count = IDE_MIN (pc->sg->length - pc->b_count, bcount);
+ buf = page_address(pc->sg->page) + pc->sg->offset;
+ atapi_input_bytes (drive, buf + pc->b_count, count);
+ bcount -= count; pc->b_count += count;
+ if (pc->b_count == pc->sg->length) {
+ pc->sg++;
+ pc->b_count = 0;
+ }
+ }
+}
+
+static void idescsi_output_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigned int bcount)
+{
+ int count;
+ char *buf;
+
+ while (bcount) {
+ if (pc->sg - (struct scatterlist *) pc->scsi_cmd->request_buffer > pc->scsi_cmd->use_sg) {
+ printk (KERN_ERR "ide-scsi: scatter gather table too small, padding with zeros\n");
+ idescsi_output_zeros (drive, bcount);
+ return;
+ }
+ count = IDE_MIN (pc->sg->length - pc->b_count, bcount);
+ buf = page_address(pc->sg->page) + pc->sg->offset;
+ atapi_output_bytes (drive, buf + pc->b_count, count);
+ bcount -= count; pc->b_count += count;
+ if (pc->b_count == pc->sg->length) {
+ pc->sg++;
+ pc->b_count = 0;
+ }
+ }
+}
+
+/*
+ * Most of the SCSI commands are supported directly by ATAPI devices.
+ * idescsi_transform_pc handles the few exceptions.
+ */
+static inline void idescsi_transform_pc1 (ide_drive_t *drive, idescsi_pc_t *pc)
+{
+ u8 *c = pc->c, *scsi_buf = pc->buffer, *sc = pc->scsi_cmd->cmnd;
+ char *atapi_buf;
+
+ if (!test_bit(PC_TRANSFORM, &pc->flags))
+ return;
+ if (drive->media == ide_cdrom || drive->media == ide_optical) {
+ if (c[0] == READ_6 || c[0] == WRITE_6) {
+ c[8] = c[4]; c[5] = c[3]; c[4] = c[2];
+ c[3] = c[1] & 0x1f; c[2] = 0; c[1] &= 0xe0;
+ c[0] += (READ_10 - READ_6);
+ }
+ if (c[0] == MODE_SENSE || c[0] == MODE_SELECT) {
+ unsigned short new_len;
+ if (!scsi_buf)
+ return;
+ if ((atapi_buf = kmalloc(pc->buffer_size + 4, GFP_ATOMIC)) == NULL)
+ return;
+ memset(atapi_buf, 0, pc->buffer_size + 4);
+ memset (c, 0, 12);
+ c[0] = sc[0] | 0x40;
+ c[1] = sc[1];
+ c[2] = sc[2];
+ new_len = sc[4] + 4;
+ c[8] = new_len;
+ c[9] = sc[5];
+ c[7] = new_len >> 8;
+ if (c[0] == MODE_SELECT_10) {
+ atapi_buf[1] = scsi_buf[0]; /* Mode data length */
+ atapi_buf[2] = scsi_buf[1]; /* Medium type */
+ atapi_buf[3] = scsi_buf[2]; /* Device specific parameter */
+ atapi_buf[7] = scsi_buf[3]; /* Block descriptor length */
+ memcpy(atapi_buf + 8, scsi_buf + 4, pc->buffer_size - 4);
+ }
+ pc->buffer = atapi_buf;
+ pc->request_transfer += 4;
+ pc->buffer_size += 4;
+ }
+ }
+}
+
+static inline void idescsi_transform_pc2 (ide_drive_t *drive, idescsi_pc_t *pc)
+{
+ u8 *atapi_buf = pc->buffer;
+ u8 *sc = pc->scsi_cmd->cmnd;
+ u8 *scsi_buf = pc->scsi_cmd->request_buffer;
+
+ if (!test_bit(PC_TRANSFORM, &pc->flags))
+ return;
+ if (drive->media == ide_cdrom || drive->media == ide_optical) {
+ if (pc->c[0] == MODE_SENSE_10 && sc[0] == MODE_SENSE) {
+ scsi_buf[0] = atapi_buf[1]; /* Mode data length */
+ scsi_buf[1] = atapi_buf[2]; /* Medium type */
+ scsi_buf[2] = atapi_buf[3]; /* Device specific parameter */
+ scsi_buf[3] = atapi_buf[7]; /* Block descriptor length */
+ memcpy(scsi_buf + 4, atapi_buf + 8, pc->request_transfer - 8);
+ }
+ if (pc->c[0] == INQUIRY) {
+ scsi_buf[2] |= 2; /* ansi_revision */
+ scsi_buf[3] = (scsi_buf[3] & 0xf0) | 2; /* response data format */
+ }
+ }
+ if (atapi_buf && atapi_buf != scsi_buf)
+ kfree(atapi_buf);
+}
+
+static inline void idescsi_free_bio (struct bio *bio)
+{
+ struct bio *bhp;
+
+ while (bio) {
+ bhp = bio;
+ bio = bio->bi_next;
+ bio_put(bhp);
+ }
+}
+
+static void hexdump(u8 *x, int len)
+{
+ int i;
+
+ printk("[ ");
+ for (i = 0; i < len; i++)
+ printk("%x ", x[i]);
+ printk("]\n");
+}
+
+static int idescsi_end_request (ide_drive_t *drive, int uptodate)
+{
+ idescsi_scsi_t *scsi = drive->driver_data;
+ struct request *rq = HWGROUP(drive)->rq;
+ idescsi_pc_t *pc = (idescsi_pc_t *) rq->special;
+ int log = test_bit(IDESCSI_LOG_CMD, &scsi->log);
+ struct Scsi_Host *host;
+ u8 *scsi_buf;
+ unsigned long flags;
+
+ if (!(rq->flags & REQ_SPECIAL)) {
+ ide_end_request(drive, uptodate);
+ return 0;
+ }
+ ide_end_drive_cmd (drive, 0, 0);
+ if (rq->errors >= ERROR_MAX) {
+ pc->scsi_cmd->result = DID_ERROR << 16;
+ if (log)
+ printk ("ide-scsi: %s: I/O error for %lu\n", drive->name, pc->scsi_cmd->serial_number);
+ } else if (rq->errors) {
+ pc->scsi_cmd->result = (CHECK_CONDITION << 1) | (DID_OK << 16);
+ if (log)
+ printk ("ide-scsi: %s: check condition for %lu\n", drive->name, pc->scsi_cmd->serial_number);
+ } else {
+ pc->scsi_cmd->result = DID_OK << 16;
+ idescsi_transform_pc2 (drive, pc);
+ if (log) {
+ printk ("ide-scsi: %s: suc %lu", drive->name, pc->scsi_cmd->serial_number);
+ if (!test_bit(PC_WRITING, &pc->flags) && pc->actually_transferred && pc->actually_transferred <= 1024 && pc->buffer) {
+ printk(", rst = ");
+ scsi_buf = pc->scsi_cmd->request_buffer;
+ hexdump(scsi_buf, IDE_MIN(16, pc->scsi_cmd->request_bufflen));
+ } else printk("\n");
+ }
+ }
+ host = pc->scsi_cmd->host;
+ spin_lock_irqsave(host->host_lock, flags);
+ pc->done(pc->scsi_cmd);
+ spin_unlock_irqrestore(host->host_lock, flags);
+ idescsi_free_bio (rq->bio);
+ kfree(pc); kfree(rq);
+ scsi->pc = NULL;
+ return 0;
+}
+
+static inline unsigned long get_timeout(idescsi_pc_t *pc)
+{
+ return IDE_MAX(WAIT_CMD, pc->timeout - jiffies);
+}
+
+/*
+ * Our interrupt handler.
+ */
+static ide_startstop_t idescsi_pc_intr (ide_drive_t *drive)
+{
+ idescsi_scsi_t *scsi = drive->driver_data;
+ byte status, ireason;
+ int bcount;
+ idescsi_pc_t *pc=scsi->pc;
+ struct request *rq = pc->rq;
+ unsigned int temp;
+
+#if IDESCSI_DEBUG_LOG
+ printk (KERN_INFO "ide-scsi: Reached idescsi_pc_intr interrupt handler\n");
+#endif /* IDESCSI_DEBUG_LOG */
+
+ if (test_and_clear_bit (PC_DMA_IN_PROGRESS, &pc->flags)) {
+#if IDESCSI_DEBUG_LOG
+ printk ("ide-scsi: %s: DMA complete\n", drive->name);
+#endif /* IDESCSI_DEBUG_LOG */
+ pc->actually_transferred=pc->request_transfer;
+ (void) (HWIF(drive)->dmaproc(ide_dma_end, drive));
+ }
+
+ status = GET_STAT(); /* Clear the interrupt */
+
+ if ((status & DRQ_STAT) == 0) { /* No more interrupts */
+ if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
+ printk (KERN_INFO "Packet command completed, %d bytes transferred\n", pc->actually_transferred);
+ local_irq_enable();
+ if (status & ERR_STAT)
+ rq->errors++;
+ idescsi_end_request (drive, 1);
+ return ide_stopped;
+ }
+ bcount = IN_BYTE (IDE_BCOUNTH_REG) << 8 | IN_BYTE (IDE_BCOUNTL_REG);
+ ireason = IN_BYTE (IDE_IREASON_REG);
+
+ if (ireason & IDESCSI_IREASON_COD) {
+ printk (KERN_ERR "ide-scsi: CoD != 0 in idescsi_pc_intr\n");
+ return ide_do_reset (drive);
+ }
+ if (ireason & IDESCSI_IREASON_IO) {
+ temp = pc->actually_transferred + bcount;
+ if ( temp > pc->request_transfer) {
+ if (temp > pc->buffer_size) {
+ printk (KERN_ERR "ide-scsi: The scsi wants to send us more data than expected - discarding data\n");
+ temp = pc->buffer_size - pc->actually_transferred;
+ if (temp) {
+ clear_bit(PC_WRITING, &pc->flags);
+ if (pc->sg)
+ idescsi_input_buffers(drive, pc, temp);
+ else
+ atapi_input_bytes(drive, pc->current_position, temp);
+ printk(KERN_ERR "ide-scsi: transferred %d of %d bytes\n", temp, bcount);
+ }
+ pc->actually_transferred += temp;
+ pc->current_position += temp;
+ idescsi_discard_data (drive,bcount - temp);
+ ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), NULL);
+ return ide_started;
+ }
+#if IDESCSI_DEBUG_LOG
+ printk (KERN_NOTICE "ide-scsi: The scsi wants to send us more data than expected - allowing transfer\n");
+#endif /* IDESCSI_DEBUG_LOG */
+ }
+ }
+ if (ireason & IDESCSI_IREASON_IO) {
+ clear_bit(PC_WRITING, &pc->flags);
+ if (pc->sg)
+ idescsi_input_buffers (drive, pc, bcount);
+ else
+ atapi_input_bytes (drive,pc->current_position,bcount);
+ } else {
+ set_bit(PC_WRITING, &pc->flags);
+ if (pc->sg)
+ idescsi_output_buffers (drive, pc, bcount);
+ else
+ atapi_output_bytes (drive,pc->current_position,bcount);
+ }
+ pc->actually_transferred+=bcount; /* Update the current position */
+ pc->current_position+=bcount;
+
+ ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), NULL); /* And set the interrupt handler again */
+ return ide_started;
+}
+
+static ide_startstop_t idescsi_transfer_pc (ide_drive_t *drive)
+{
+ idescsi_scsi_t *scsi = drive->driver_data;
+ idescsi_pc_t *pc = scsi->pc;
+ byte ireason;
+ ide_startstop_t startstop;
+
+ if (ide_wait_stat (&startstop,drive,DRQ_STAT,BUSY_STAT,WAIT_READY)) {
+ printk (KERN_ERR "ide-scsi: Strange, packet command initiated yet DRQ isn't asserted\n");
+ return startstop;
+ }
+ ireason = IN_BYTE (IDE_IREASON_REG);
+ if ((ireason & (IDESCSI_IREASON_IO | IDESCSI_IREASON_COD)) != IDESCSI_IREASON_COD) {
+ printk (KERN_ERR "ide-scsi: (IO,CoD) != (0,1) while issuing a packet command\n");
+ return ide_do_reset (drive);
+ }
+ ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), NULL); /* Set the interrupt routine */
+ atapi_output_bytes (drive, scsi->pc->c, 12); /* Send the actual packet */
+ return ide_started;
+}
+
+/*
+ * Issue a packet command
+ */
+static ide_startstop_t idescsi_issue_pc (ide_drive_t *drive, idescsi_pc_t *pc)
+{
+ idescsi_scsi_t *scsi = drive->driver_data;
+ int bcount;
+ struct request *rq = pc->rq;
+ int dma_ok = 0;
+
+ scsi->pc=pc; /* Set the current packet command */
+ pc->actually_transferred=0; /* We haven't transferred any data yet */
+ pc->current_position=pc->buffer;
+ bcount = IDE_MIN (pc->request_transfer, 63 * 1024); /* Request to transfer the entire buffer at once */
+
+ if (drive->using_dma && rq->bio)
+ dma_ok=!HWIF(drive)->dmaproc(test_bit (PC_WRITING, &pc->flags) ? ide_dma_write : ide_dma_read, drive);
+
+ SELECT_DRIVE(HWIF(drive), drive);
+ if (IDE_CONTROL_REG)
+ OUT_BYTE (drive->ctl,IDE_CONTROL_REG);
+ OUT_BYTE (dma_ok,IDE_FEATURE_REG);
+ OUT_BYTE (bcount >> 8,IDE_BCOUNTH_REG);
+ OUT_BYTE (bcount & 0xff,IDE_BCOUNTL_REG);
+
+ if (dma_ok) {
+ set_bit (PC_DMA_IN_PROGRESS, &pc->flags);
+ (void) (HWIF(drive)->dmaproc(ide_dma_begin, drive));
+ }
+ if (test_bit (IDESCSI_DRQ_INTERRUPT, &scsi->flags)) {
+ ide_set_handler (drive, &idescsi_transfer_pc, get_timeout(pc), NULL);
+ OUT_BYTE (WIN_PACKETCMD, IDE_COMMAND_REG); /* Issue the packet command */
+ return ide_started;
+ } else {
+ OUT_BYTE (WIN_PACKETCMD, IDE_COMMAND_REG);
+ return idescsi_transfer_pc (drive);
+ }
+}
+
+/*
+ * idescsi_do_request is our request handling function.
+ */
+static ide_startstop_t idescsi_do_request (ide_drive_t *drive, struct request *rq, unsigned long block)
+{
+#if IDESCSI_DEBUG_LOG
+ printk (KERN_INFO "rq_status: %d, rq_dev: %u, cmd: %d, errors: %d\n",rq->rq_status,(unsigned int) rq->rq_dev,rq->cmd,rq->errors);
+ printk (KERN_INFO "sector: %ld, nr_sectors: %ld, current_nr_sectors: %ld\n",rq->sector,rq->nr_sectors,rq->current_nr_sectors);
+#endif /* IDESCSI_DEBUG_LOG */
+
+ if (rq->flags & REQ_SPECIAL) {
+ return idescsi_issue_pc (drive, (idescsi_pc_t *) rq->special);
+ }
+ blk_dump_rq_flags(rq, "ide-scsi: unsup command");
+ idescsi_end_request (drive, 0);
+ return ide_stopped;
+}
+
+static int idescsi_open (struct inode *inode, struct file *filp, ide_drive_t *drive)
+{
+ MOD_INC_USE_COUNT;
+ return 0;
+}
+
+static void idescsi_ide_release (struct inode *inode, struct file *filp, ide_drive_t *drive)
+{
+ MOD_DEC_USE_COUNT;
+}
+
+static ide_drive_t *idescsi_drives[MAX_HWIFS * MAX_DRIVES];
+static int idescsi_initialized = 0;
+
+static void idescsi_add_settings(ide_drive_t *drive)
+{
+ idescsi_scsi_t *scsi = drive->driver_data;
+
+/*
+ * drive setting name read/write ioctl ioctl data type min max mul_factor div_factor data pointer set function
+ */
+ ide_add_setting(drive, "bios_cyl", SETTING_RW, -1, -1, TYPE_INT, 0, 1023, 1, 1, &drive->bios_cyl, NULL);
+ ide_add_setting(drive, "bios_head", SETTING_RW, -1, -1, TYPE_BYTE, 0, 255, 1, 1, &drive->bios_head, NULL);
+ ide_add_setting(drive, "bios_sect", SETTING_RW, -1, -1, TYPE_BYTE, 0, 63, 1, 1, &drive->bios_sect, NULL);
+ ide_add_setting(drive, "transform", SETTING_RW, -1, -1, TYPE_INT, 0, 3, 1, 1, &scsi->transform, NULL);
+ ide_add_setting(drive, "log", SETTING_RW, -1, -1, TYPE_INT, 0, 1, 1, 1, &scsi->log, NULL);
+}
+
+/*
+ * Driver initialization.
+ */
+static void idescsi_setup (ide_drive_t *drive, idescsi_scsi_t *scsi, int id)
+{
+ DRIVER(drive)->busy++;
+ idescsi_drives[id] = drive;
+ drive->driver_data = scsi;
+ drive->ready_stat = 0;
+ memset (scsi, 0, sizeof (idescsi_scsi_t));
+ scsi->drive = drive;
+ if (drive->id && (drive->id->config & 0x0060) == 0x20)
+ set_bit (IDESCSI_DRQ_INTERRUPT, &scsi->flags);
+ set_bit(IDESCSI_TRANSFORM, &scsi->transform);
+ clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
+#if IDESCSI_DEBUG_LOG
+ set_bit(IDESCSI_LOG_CMD, &scsi->log);
+#endif /* IDESCSI_DEBUG_LOG */
+ idescsi_add_settings(drive);
+}
+
+static int idescsi_cleanup (ide_drive_t *drive)
+{
+ idescsi_scsi_t *scsi = drive->driver_data;
+
+ if (ide_unregister_subdriver (drive))
+ return 1;
+ drive->driver_data = NULL;
+ kfree (scsi);
+ return 0;
+}
+
+/*
+ * IDE subdriver functions, registered with ide.c
+ */
+static ide_driver_t idescsi_driver = {
+ name: "ide-scsi",
+ version: IDESCSI_VERSION,
+ media: ide_scsi,
+ busy: 0,
+ supports_dma: 1,
+ supports_dsc_overlap: 0,
+ cleanup: idescsi_cleanup,
+ standby: NULL,
+ flushcache: NULL,
+ do_request: idescsi_do_request,
+ end_request: idescsi_end_request,
+ ioctl: NULL,
+ open: idescsi_open,
+ release: idescsi_ide_release,
+ media_change: NULL,
+ revalidate: NULL,
+ pre_reset: NULL,
+ capacity: NULL,
+ special: NULL,
+ proc: NULL,
+};
+
+int idescsi_init (void);
+static ide_module_t idescsi_module = {
+ IDE_DRIVER_MODULE,
+ idescsi_init,
+ &idescsi_driver,
+ NULL
+};
+
+/*
+ * idescsi_init will register the driver for each scsi.
+ */
+int idescsi_init (void)
+{
+ ide_drive_t *drive;
+ idescsi_scsi_t *scsi;
+ byte media[] = {TYPE_DISK, TYPE_TAPE, TYPE_PROCESSOR, TYPE_WORM, TYPE_ROM, TYPE_SCANNER, TYPE_MOD, 255};
+ int i, failed, id;
+
+ if (idescsi_initialized)
+ return 0;
+ idescsi_initialized = 1;
+ for (i = 0; i < MAX_HWIFS * MAX_DRIVES; i++)
+ idescsi_drives[i] = NULL;
+ MOD_INC_USE_COUNT;
+ for (i = 0; media[i] != 255; i++) {
+ failed = 0;
+ while ((drive = ide_scan_devices (media[i], idescsi_driver.name, NULL, failed++)) != NULL) {
+
+ if ((scsi = (idescsi_scsi_t *) kmalloc (sizeof (idescsi_scsi_t), GFP_KERNEL)) == NULL) {
+ printk (KERN_ERR "ide-scsi: %s: Can't allocate a scsi structure\n", drive->name);
+ continue;
+ }
+ if (ide_register_subdriver (drive, &idescsi_driver, IDE_SUBDRIVER_VERSION)) {
+ printk (KERN_ERR "ide-scsi: %s: Failed to register the driver with ide.c\n", drive->name);
+ kfree (scsi);
+ continue;
+ }
+ for (id = 0; id < MAX_HWIFS * MAX_DRIVES && idescsi_drives[id]; id++);
+ idescsi_setup (drive, scsi, id);
+ failed--;
+ }
+ }
+ ide_register_module(&idescsi_module);
+ MOD_DEC_USE_COUNT;
+ return 0;
+}
+
+int idescsi_detect (Scsi_Host_Template *host_template)
+{
+ struct Scsi_Host *host;
+ int id;
+ int last_lun = 0;
+
+ host_template->proc_name = "ide-scsi";
+ host = scsi_register(host_template, 0);
+ if(host == NULL)
+ return 0;
+
+ for (id = 0; id < MAX_HWIFS * MAX_DRIVES && idescsi_drives[id]; id++)
+ last_lun = IDE_MAX(last_lun, idescsi_drives[id]->last_lun);
+ host->max_id = id;
+ host->max_lun = last_lun + 1;
+ host->can_queue = host->cmd_per_lun * id;
+ return 1;
+}
+
+int idescsi_release (struct Scsi_Host *host)
+{
+ ide_drive_t *drive;
+ int id;
+
+ for (id = 0; id < MAX_HWIFS * MAX_DRIVES; id++) {
+ drive = idescsi_drives[id];
+ if (drive)
+ DRIVER(drive)->busy--;
+ }
+ return 0;
+}
+
+const char *idescsi_info (struct Scsi_Host *host)
+{
+ return "SCSI host adapter emulation for IDE ATAPI devices";
+}
+
+int idescsi_ioctl (Scsi_Device *dev, int cmd, void *arg)
+{
+ ide_drive_t *drive = idescsi_drives[dev->id];
+ idescsi_scsi_t *scsi = drive->driver_data;
+
+ if (cmd == SG_SET_TRANSFORM) {
+ if (arg)
+ set_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
+ else
+ clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
+ return 0;
+ } else if (cmd == SG_GET_TRANSFORM)
+ return put_user(test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform), (int *) arg);
+ return -EINVAL;
+}
+
+static inline struct bio *idescsi_kmalloc_bio (int count)
+{
+ struct bio *bh, *bhp, *first_bh;
+
+ if ((first_bh = bhp = bh = bio_alloc(GFP_ATOMIC, 1)) == NULL)
+ goto abort;
+ bio_init(bh);
+ bh->bi_vcnt = 1;
+ while (--count) {
+ if ((bh = bio_alloc(GFP_ATOMIC, 1)) == NULL)
+ goto abort;
+ bio_init(bh);
+ bh->bi_vcnt = 1;
+ bhp->bi_next = bh;
+ bhp = bh;
+ bh->bi_next = NULL;
+ }
+ return first_bh;
+abort:
+ idescsi_free_bio (first_bh);
+ return NULL;
+}
+
+static inline int idescsi_set_direction (idescsi_pc_t *pc)
+{
+ switch (pc->c[0]) {
+ case READ_6: case READ_10: case READ_12:
+ clear_bit (PC_WRITING, &pc->flags);
+ return 0;
+ case WRITE_6: case WRITE_10: case WRITE_12:
+ set_bit (PC_WRITING, &pc->flags);
+ return 0;
+ default:
+ return 1;
+ }
+}
+
+static inline struct bio *idescsi_dma_bio(ide_drive_t *drive, idescsi_pc_t *pc)
+{
+ struct bio *bh = NULL, *first_bh = NULL;
+ int segments = pc->scsi_cmd->use_sg;
+ struct scatterlist *sg = pc->scsi_cmd->request_buffer;
+
+ if (!drive->using_dma || !pc->request_transfer || pc->request_transfer % 1024)
+ return NULL;
+ if (idescsi_set_direction(pc))
+ return NULL;
+ if (segments) {
+ if ((first_bh = bh = idescsi_kmalloc_bio (segments)) == NULL)
+ return NULL;
+#if IDESCSI_DEBUG_LOG
+ printk ("ide-scsi: %s: building DMA table, %d segments, %dkB total\n", drive->name, segments, pc->request_transfer >> 10);
+#endif /* IDESCSI_DEBUG_LOG */
+ while (segments--) {
+ bh->bi_io_vec[0].bv_page = sg->page;
+ bh->bi_io_vec[0].bv_len = sg->length;
+ bh->bi_io_vec[0].bv_offset = sg->offset;
+ bh->bi_size = sg->length;
+ bh = bh->bi_next;
+ sg++;
+ }
+ } else {
+ if ((first_bh = bh = idescsi_kmalloc_bio (1)) == NULL)
+ return NULL;
+#if IDESCSI_DEBUG_LOG
+ printk ("ide-scsi: %s: building DMA table for a single buffer (%dkB)\n", drive->name, pc->request_transfer >> 10);
+#endif /* IDESCSI_DEBUG_LOG */
+ bh->bi_io_vec[0].bv_page = virt_to_page(pc->scsi_cmd->request_buffer);
+ bh->bi_io_vec[0].bv_len = pc->request_transfer;
+ bh->bi_io_vec[0].bv_offset = (unsigned long) pc->scsi_cmd->request_buffer & ~PAGE_MASK;
+ bh->bi_size = pc->request_transfer;
+ }
+ return first_bh;
+}
+
+static inline int should_transform(ide_drive_t *drive, Scsi_Cmnd *cmd)
+{
+ idescsi_scsi_t *scsi = drive->driver_data;
+
+ if (major(cmd->request->rq_dev) == SCSI_GENERIC_MAJOR)
+ return test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
+ return test_bit(IDESCSI_TRANSFORM, &scsi->transform);
+}
+
+int idescsi_queue (Scsi_Cmnd *cmd, void (*done)(Scsi_Cmnd *))
+{
+ ide_drive_t *drive = idescsi_drives[cmd->target];
+ idescsi_scsi_t *scsi;
+ struct request *rq = NULL;
+ idescsi_pc_t *pc = NULL;
+
+ if (!drive) {
+ printk (KERN_ERR "ide-scsi: drive id %d not present\n", cmd->target);
+ goto abort;
+ }
+ scsi = drive->driver_data;
+ pc = kmalloc (sizeof (idescsi_pc_t), GFP_ATOMIC);
+ rq = kmalloc (sizeof (struct request), GFP_ATOMIC);
+ if (rq == NULL || pc == NULL) {
+ printk (KERN_ERR "ide-scsi: %s: out of memory\n", drive->name);
+ goto abort;
+ }
+
+ memset (pc->c, 0, 12);
+ pc->flags = 0;
+ pc->rq = rq;
+ memcpy (pc->c, cmd->cmnd, cmd->cmd_len);
+ if (cmd->use_sg) {
+ pc->buffer = NULL;
+ pc->sg = cmd->request_buffer;
+ } else {
+ pc->buffer = cmd->request_buffer;
+ pc->sg = NULL;
+ }
+ pc->b_count = 0;
+ pc->request_transfer = pc->buffer_size = cmd->request_bufflen;
+ pc->scsi_cmd = cmd;
+ pc->done = done;
+ pc->timeout = jiffies + cmd->timeout_per_command;
+
+ if (should_transform(drive, cmd))
+ set_bit(PC_TRANSFORM, &pc->flags);
+ idescsi_transform_pc1 (drive, pc);
+
+ if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
+ printk ("ide-scsi: %s: que %lu, cmd = ", drive->name, cmd->serial_number);
+ hexdump(cmd->cmnd, cmd->cmd_len);
+ if (memcmp(pc->c, cmd->cmnd, cmd->cmd_len)) {
+ printk ("ide-scsi: %s: que %lu, tsl = ", drive->name, cmd->serial_number);
+ hexdump(pc->c, 12);
+ }
+ }
+
+ ide_init_drive_cmd (rq);
+ rq->special = (char *) pc;
+ rq->bio = idescsi_dma_bio (drive, pc);
+ rq->flags = REQ_SPECIAL;
+ spin_unlock_irq(cmd->host->host_lock);
+ (void) ide_do_drive_cmd (drive, rq, ide_end);
+ spin_lock_irq(cmd->host->host_lock);
+ return 0;
+abort:
+ if (pc) kfree (pc);
+ if (rq) kfree (rq);
+ cmd->result = DID_ERROR << 16;
+ done(cmd);
+ return 0;
+}
+
+int idescsi_abort (Scsi_Cmnd *cmd)
+{
+ return SCSI_ABORT_SNOOZE;
+}
+
+int idescsi_reset (Scsi_Cmnd *cmd, unsigned int resetflags)
+{
+ return SCSI_RESET_SUCCESS;
+}
+
+static int idescsi_bios(Disk *disk, struct block_device *dev, int *parm)
+{
+ ide_drive_t *drive = idescsi_drives[disk->device->id];
+
+ if (drive->bios_cyl && drive->bios_head && drive->bios_sect) {
+ parm[0] = drive->bios_head;
+ parm[1] = drive->bios_sect;
+ parm[2] = drive->bios_cyl;
+ }
+ return 0;
+}
+
+static Scsi_Host_Template idescsi_template = {
+ module: THIS_MODULE,
+ name: "idescsi",
+ detect: idescsi_detect,
+ release: idescsi_release,
+ info: idescsi_info,
+ ioctl: idescsi_ioctl,
+ queuecommand: idescsi_queue,
+ abort: idescsi_abort,
+ reset: idescsi_reset,
+ bios_param: idescsi_bios,
+ can_queue: 10,
+ this_id: -1,
+ sg_tablesize: 256,
+ cmd_per_lun: 5,
+ use_clustering: DISABLE_CLUSTERING,
+ emulated: 1,
+};
+
+static int __init init_idescsi_module(void)
+{
+ idescsi_init();
+ scsi_register_host(&idescsi_template);
+ return 0;
+}
+
+static void __exit exit_idescsi_module(void)
+{
+ ide_drive_t *drive;
+ byte media[] = {TYPE_DISK, TYPE_TAPE, TYPE_PROCESSOR, TYPE_WORM, TYPE_ROM, TYPE_SCANNER, TYPE_MOD, 255};
+ int i, failed;
+
+ scsi_unregister_host(&idescsi_template);
+ for (i = 0; media[i] != 255; i++) {
+ failed = 0;
+ while ((drive = ide_scan_devices (media[i], idescsi_driver.name, &idescsi_driver, failed)) != NULL)
+ if (idescsi_cleanup (drive)) {
+ printk ("%s: exit_idescsi_module() called while still busy\n", drive->name);
+ failed++;
+ }
+ }
+ ide_unregister_module(&idescsi_module);
+}
+
+module_init(init_idescsi_module);
+module_exit(exit_idescsi_module);
+MODULE_LICENSE("GPL");
projects / history.git / commitdiff