mirror of https://gitee.com/openkylin/linux.git
647 lines
16 KiB
C
647 lines
16 KiB
C
/*
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* ATAPI support.
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*/
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#include <linux/kernel.h>
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#include <linux/cdrom.h>
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#include <linux/delay.h>
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#include <linux/ide.h>
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#include <scsi/scsi.h>
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#ifdef DEBUG
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#define debug_log(fmt, args...) \
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printk(KERN_INFO "ide: " fmt, ## args)
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#else
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#define debug_log(fmt, args...) do {} while (0)
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#endif
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#define ATAPI_MIN_CDB_BYTES 12
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static inline int dev_is_idecd(ide_drive_t *drive)
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{
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return drive->media == ide_cdrom || drive->media == ide_optical;
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}
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/*
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* Check whether we can support a device,
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* based on the ATAPI IDENTIFY command results.
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*/
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int ide_check_atapi_device(ide_drive_t *drive, const char *s)
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{
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u16 *id = drive->id;
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u8 gcw[2], protocol, device_type, removable, drq_type, packet_size;
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*((u16 *)&gcw) = id[ATA_ID_CONFIG];
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protocol = (gcw[1] & 0xC0) >> 6;
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device_type = gcw[1] & 0x1F;
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removable = (gcw[0] & 0x80) >> 7;
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drq_type = (gcw[0] & 0x60) >> 5;
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packet_size = gcw[0] & 0x03;
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#ifdef CONFIG_PPC
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/* kludge for Apple PowerBook internal zip */
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if (drive->media == ide_floppy && device_type == 5 &&
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!strstr((char *)&id[ATA_ID_PROD], "CD-ROM") &&
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strstr((char *)&id[ATA_ID_PROD], "ZIP"))
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device_type = 0;
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#endif
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if (protocol != 2)
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printk(KERN_ERR "%s: %s: protocol (0x%02x) is not ATAPI\n",
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s, drive->name, protocol);
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else if ((drive->media == ide_floppy && device_type != 0) ||
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(drive->media == ide_tape && device_type != 1))
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printk(KERN_ERR "%s: %s: invalid device type (0x%02x)\n",
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s, drive->name, device_type);
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else if (removable == 0)
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printk(KERN_ERR "%s: %s: the removable flag is not set\n",
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s, drive->name);
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else if (drive->media == ide_floppy && drq_type == 3)
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printk(KERN_ERR "%s: %s: sorry, DRQ type (0x%02x) not "
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"supported\n", s, drive->name, drq_type);
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else if (packet_size != 0)
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printk(KERN_ERR "%s: %s: packet size (0x%02x) is not 12 "
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"bytes\n", s, drive->name, packet_size);
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else
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return 1;
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return 0;
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}
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EXPORT_SYMBOL_GPL(ide_check_atapi_device);
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/* PIO data transfer routine using the scatter gather table. */
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int ide_io_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
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unsigned int bcount, int write)
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{
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ide_hwif_t *hwif = drive->hwif;
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const struct ide_tp_ops *tp_ops = hwif->tp_ops;
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xfer_func_t *xf = write ? tp_ops->output_data : tp_ops->input_data;
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struct scatterlist *sg = pc->sg;
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char *buf;
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int count, done = 0;
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while (bcount) {
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count = min(sg->length - pc->b_count, bcount);
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if (PageHighMem(sg_page(sg))) {
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unsigned long flags;
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local_irq_save(flags);
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buf = kmap_atomic(sg_page(sg), KM_IRQ0) + sg->offset;
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xf(drive, NULL, buf + pc->b_count, count);
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kunmap_atomic(buf - sg->offset, KM_IRQ0);
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local_irq_restore(flags);
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} else {
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buf = sg_virt(sg);
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xf(drive, NULL, buf + pc->b_count, count);
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}
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bcount -= count;
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pc->b_count += count;
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done += count;
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if (pc->b_count == sg->length) {
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if (!--pc->sg_cnt)
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break;
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pc->sg = sg = sg_next(sg);
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pc->b_count = 0;
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}
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}
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if (bcount) {
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printk(KERN_ERR "%s: %d leftover bytes, %s\n", drive->name,
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bcount, write ? "padding with zeros"
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: "discarding data");
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ide_pad_transfer(drive, write, bcount);
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}
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return done;
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}
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EXPORT_SYMBOL_GPL(ide_io_buffers);
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void ide_init_pc(struct ide_atapi_pc *pc)
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{
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memset(pc, 0, sizeof(*pc));
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pc->buf = pc->pc_buf;
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pc->buf_size = IDE_PC_BUFFER_SIZE;
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}
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EXPORT_SYMBOL_GPL(ide_init_pc);
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/*
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* Generate a new packet command request in front of the request queue, before
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* the current request, so that it will be processed immediately, on the next
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* pass through the driver.
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*/
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static void ide_queue_pc_head(ide_drive_t *drive, struct gendisk *disk,
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struct ide_atapi_pc *pc, struct request *rq)
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{
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blk_rq_init(NULL, rq);
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rq->cmd_type = REQ_TYPE_SPECIAL;
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rq->cmd_flags |= REQ_PREEMPT;
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rq->buffer = (char *)pc;
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rq->rq_disk = disk;
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if (pc->req_xfer) {
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rq->data = pc->buf;
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rq->data_len = pc->req_xfer;
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}
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memcpy(rq->cmd, pc->c, 12);
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if (drive->media == ide_tape)
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rq->cmd[13] = REQ_IDETAPE_PC1;
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ide_do_drive_cmd(drive, rq);
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}
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/*
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* Add a special packet command request to the tail of the request queue,
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* and wait for it to be serviced.
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*/
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int ide_queue_pc_tail(ide_drive_t *drive, struct gendisk *disk,
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struct ide_atapi_pc *pc)
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{
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struct request *rq;
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int error;
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rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
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rq->cmd_type = REQ_TYPE_SPECIAL;
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rq->buffer = (char *)pc;
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if (pc->req_xfer) {
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rq->data = pc->buf;
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rq->data_len = pc->req_xfer;
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}
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memcpy(rq->cmd, pc->c, 12);
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if (drive->media == ide_tape)
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rq->cmd[13] = REQ_IDETAPE_PC1;
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error = blk_execute_rq(drive->queue, disk, rq, 0);
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blk_put_request(rq);
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return error;
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}
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EXPORT_SYMBOL_GPL(ide_queue_pc_tail);
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int ide_do_test_unit_ready(ide_drive_t *drive, struct gendisk *disk)
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{
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struct ide_atapi_pc pc;
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ide_init_pc(&pc);
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pc.c[0] = TEST_UNIT_READY;
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return ide_queue_pc_tail(drive, disk, &pc);
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}
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EXPORT_SYMBOL_GPL(ide_do_test_unit_ready);
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int ide_do_start_stop(ide_drive_t *drive, struct gendisk *disk, int start)
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{
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struct ide_atapi_pc pc;
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ide_init_pc(&pc);
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pc.c[0] = START_STOP;
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pc.c[4] = start;
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if (drive->media == ide_tape)
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pc.flags |= PC_FLAG_WAIT_FOR_DSC;
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return ide_queue_pc_tail(drive, disk, &pc);
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}
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EXPORT_SYMBOL_GPL(ide_do_start_stop);
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int ide_set_media_lock(ide_drive_t *drive, struct gendisk *disk, int on)
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{
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struct ide_atapi_pc pc;
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if ((drive->dev_flags & IDE_DFLAG_DOORLOCKING) == 0)
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return 0;
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ide_init_pc(&pc);
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pc.c[0] = ALLOW_MEDIUM_REMOVAL;
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pc.c[4] = on;
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return ide_queue_pc_tail(drive, disk, &pc);
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}
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EXPORT_SYMBOL_GPL(ide_set_media_lock);
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void ide_create_request_sense_cmd(ide_drive_t *drive, struct ide_atapi_pc *pc)
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{
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ide_init_pc(pc);
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pc->c[0] = REQUEST_SENSE;
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if (drive->media == ide_floppy) {
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pc->c[4] = 255;
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pc->req_xfer = 18;
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} else {
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pc->c[4] = 20;
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pc->req_xfer = 20;
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}
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}
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EXPORT_SYMBOL_GPL(ide_create_request_sense_cmd);
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/*
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* Called when an error was detected during the last packet command.
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* We queue a request sense packet command in the head of the request list.
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*/
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void ide_retry_pc(ide_drive_t *drive, struct gendisk *disk)
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{
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struct request *rq = &drive->request_sense_rq;
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struct ide_atapi_pc *pc = &drive->request_sense_pc;
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(void)ide_read_error(drive);
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ide_create_request_sense_cmd(drive, pc);
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if (drive->media == ide_tape)
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set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags);
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ide_queue_pc_head(drive, disk, pc, rq);
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}
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EXPORT_SYMBOL_GPL(ide_retry_pc);
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int ide_cd_expiry(ide_drive_t *drive)
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{
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struct request *rq = drive->hwif->rq;
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unsigned long wait = 0;
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debug_log("%s: rq->cmd[0]: 0x%x\n", __func__, rq->cmd[0]);
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/*
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* Some commands are *slow* and normally take a long time to complete.
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* Usually we can use the ATAPI "disconnect" to bypass this, but not all
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* commands/drives support that. Let ide_timer_expiry keep polling us
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* for these.
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*/
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switch (rq->cmd[0]) {
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case GPCMD_BLANK:
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case GPCMD_FORMAT_UNIT:
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case GPCMD_RESERVE_RZONE_TRACK:
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case GPCMD_CLOSE_TRACK:
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case GPCMD_FLUSH_CACHE:
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wait = ATAPI_WAIT_PC;
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break;
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default:
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if (!(rq->cmd_flags & REQ_QUIET))
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printk(KERN_INFO "cmd 0x%x timed out\n",
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rq->cmd[0]);
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wait = 0;
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break;
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}
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return wait;
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}
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EXPORT_SYMBOL_GPL(ide_cd_expiry);
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int ide_cd_get_xferlen(struct request *rq)
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{
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if (blk_fs_request(rq))
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return 32768;
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else if (blk_sense_request(rq) || blk_pc_request(rq) ||
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rq->cmd_type == REQ_TYPE_ATA_PC)
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return rq->data_len;
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else
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return 0;
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}
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EXPORT_SYMBOL_GPL(ide_cd_get_xferlen);
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/*
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* This is the usual interrupt handler which will be called during a packet
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* command. We will transfer some of the data (as requested by the drive)
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* and will re-point interrupt handler to us.
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*/
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static ide_startstop_t ide_pc_intr(ide_drive_t *drive)
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{
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struct ide_atapi_pc *pc = drive->pc;
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ide_hwif_t *hwif = drive->hwif;
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struct request *rq = hwif->rq;
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const struct ide_tp_ops *tp_ops = hwif->tp_ops;
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xfer_func_t *xferfunc;
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unsigned int timeout, temp;
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u16 bcount;
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u8 stat, ireason, dsc = 0;
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debug_log("Enter %s - interrupt handler\n", __func__);
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timeout = (drive->media == ide_floppy) ? WAIT_FLOPPY_CMD
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: WAIT_TAPE_CMD;
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if (pc->flags & PC_FLAG_TIMEDOUT) {
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drive->pc_callback(drive, 0);
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return ide_stopped;
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}
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/* Clear the interrupt */
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stat = tp_ops->read_status(hwif);
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if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
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if (hwif->dma_ops->dma_end(drive) ||
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(drive->media == ide_tape && (stat & ATA_ERR))) {
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if (drive->media == ide_floppy)
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printk(KERN_ERR "%s: DMA %s error\n",
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drive->name, rq_data_dir(pc->rq)
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? "write" : "read");
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pc->flags |= PC_FLAG_DMA_ERROR;
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} else {
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pc->xferred = pc->req_xfer;
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if (drive->pc_update_buffers)
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drive->pc_update_buffers(drive, pc);
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}
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debug_log("%s: DMA finished\n", drive->name);
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}
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/* No more interrupts */
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if ((stat & ATA_DRQ) == 0) {
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debug_log("Packet command completed, %d bytes transferred\n",
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pc->xferred);
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pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
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local_irq_enable_in_hardirq();
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if (drive->media == ide_tape &&
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(stat & ATA_ERR) && rq->cmd[0] == REQUEST_SENSE)
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stat &= ~ATA_ERR;
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if ((stat & ATA_ERR) || (pc->flags & PC_FLAG_DMA_ERROR)) {
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/* Error detected */
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debug_log("%s: I/O error\n", drive->name);
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if (drive->media != ide_tape)
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pc->rq->errors++;
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if (rq->cmd[0] == REQUEST_SENSE) {
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printk(KERN_ERR "%s: I/O error in request sense"
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" command\n", drive->name);
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return ide_do_reset(drive);
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}
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debug_log("[cmd %x]: check condition\n", rq->cmd[0]);
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/* Retry operation */
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ide_retry_pc(drive, rq->rq_disk);
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/* queued, but not started */
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return ide_stopped;
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}
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pc->error = 0;
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if ((pc->flags & PC_FLAG_WAIT_FOR_DSC) && (stat & ATA_DSC) == 0)
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dsc = 1;
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/* Command finished - Call the callback function */
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drive->pc_callback(drive, dsc);
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return ide_stopped;
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}
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if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
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pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
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printk(KERN_ERR "%s: The device wants to issue more interrupts "
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"in DMA mode\n", drive->name);
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ide_dma_off(drive);
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return ide_do_reset(drive);
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}
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/* Get the number of bytes to transfer on this interrupt. */
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ide_read_bcount_and_ireason(drive, &bcount, &ireason);
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if (ireason & ATAPI_COD) {
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printk(KERN_ERR "%s: CoD != 0 in %s\n", drive->name, __func__);
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return ide_do_reset(drive);
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}
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if (((ireason & ATAPI_IO) == ATAPI_IO) ==
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!!(pc->flags & PC_FLAG_WRITING)) {
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/* Hopefully, we will never get here */
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printk(KERN_ERR "%s: We wanted to %s, but the device wants us "
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"to %s!\n", drive->name,
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(ireason & ATAPI_IO) ? "Write" : "Read",
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(ireason & ATAPI_IO) ? "Read" : "Write");
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return ide_do_reset(drive);
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}
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if (!(pc->flags & PC_FLAG_WRITING)) {
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/* Reading - Check that we have enough space */
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temp = pc->xferred + bcount;
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if (temp > pc->req_xfer) {
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if (temp > pc->buf_size) {
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printk(KERN_ERR "%s: The device wants to send "
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"us more data than expected - "
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"discarding data\n",
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drive->name);
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ide_pad_transfer(drive, 0, bcount);
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goto next_irq;
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}
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debug_log("The device wants to send us more data than "
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"expected - allowing transfer\n");
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}
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xferfunc = tp_ops->input_data;
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} else
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xferfunc = tp_ops->output_data;
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if ((drive->media == ide_floppy && !pc->buf) ||
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(drive->media == ide_tape && pc->bh)) {
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int done = drive->pc_io_buffers(drive, pc, bcount,
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!!(pc->flags & PC_FLAG_WRITING));
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/* FIXME: don't do partial completions */
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if (drive->media == ide_floppy)
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ide_end_request(drive, 1, done >> 9);
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} else
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xferfunc(drive, NULL, pc->cur_pos, bcount);
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/* Update the current position */
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pc->xferred += bcount;
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pc->cur_pos += bcount;
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debug_log("[cmd %x] transferred %d bytes on that intr.\n",
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rq->cmd[0], bcount);
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next_irq:
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/* And set the interrupt handler again */
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ide_set_handler(drive, ide_pc_intr, timeout, NULL);
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return ide_started;
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}
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static u8 ide_read_ireason(ide_drive_t *drive)
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{
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ide_task_t task;
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memset(&task, 0, sizeof(task));
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task.tf_flags = IDE_TFLAG_IN_NSECT;
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drive->hwif->tp_ops->tf_read(drive, &task);
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return task.tf.nsect & 3;
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}
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static u8 ide_wait_ireason(ide_drive_t *drive, u8 ireason)
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{
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int retries = 100;
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while (retries-- && ((ireason & ATAPI_COD) == 0 ||
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(ireason & ATAPI_IO))) {
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printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing "
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"a packet command, retrying\n", drive->name);
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udelay(100);
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ireason = ide_read_ireason(drive);
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if (retries == 0) {
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printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing "
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"a packet command, ignoring\n",
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drive->name);
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ireason |= ATAPI_COD;
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ireason &= ~ATAPI_IO;
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}
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}
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return ireason;
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}
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static int ide_delayed_transfer_pc(ide_drive_t *drive)
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{
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/* Send the actual packet */
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drive->hwif->tp_ops->output_data(drive, NULL, drive->pc->c, 12);
|
|
|
|
/* Timeout for the packet command */
|
|
return WAIT_FLOPPY_CMD;
|
|
}
|
|
|
|
static ide_startstop_t ide_transfer_pc(ide_drive_t *drive)
|
|
{
|
|
struct ide_atapi_pc *uninitialized_var(pc);
|
|
ide_hwif_t *hwif = drive->hwif;
|
|
struct request *rq = hwif->rq;
|
|
ide_expiry_t *expiry;
|
|
unsigned int timeout;
|
|
int cmd_len;
|
|
ide_startstop_t startstop;
|
|
u8 ireason;
|
|
|
|
if (ide_wait_stat(&startstop, drive, ATA_DRQ, ATA_BUSY, WAIT_READY)) {
|
|
printk(KERN_ERR "%s: Strange, packet command initiated yet "
|
|
"DRQ isn't asserted\n", drive->name);
|
|
return startstop;
|
|
}
|
|
|
|
if (drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT) {
|
|
if (drive->dma)
|
|
drive->waiting_for_dma = 1;
|
|
}
|
|
|
|
if (dev_is_idecd(drive)) {
|
|
/* ATAPI commands get padded out to 12 bytes minimum */
|
|
cmd_len = COMMAND_SIZE(rq->cmd[0]);
|
|
if (cmd_len < ATAPI_MIN_CDB_BYTES)
|
|
cmd_len = ATAPI_MIN_CDB_BYTES;
|
|
|
|
timeout = rq->timeout;
|
|
expiry = ide_cd_expiry;
|
|
} else {
|
|
pc = drive->pc;
|
|
|
|
cmd_len = ATAPI_MIN_CDB_BYTES;
|
|
|
|
/*
|
|
* If necessary schedule the packet transfer to occur 'timeout'
|
|
* miliseconds later in ide_delayed_transfer_pc() after the
|
|
* device says it's ready for a packet.
|
|
*/
|
|
if (drive->atapi_flags & IDE_AFLAG_ZIP_DRIVE) {
|
|
timeout = drive->pc_delay;
|
|
expiry = &ide_delayed_transfer_pc;
|
|
} else {
|
|
timeout = (drive->media == ide_floppy) ? WAIT_FLOPPY_CMD
|
|
: WAIT_TAPE_CMD;
|
|
expiry = NULL;
|
|
}
|
|
|
|
ireason = ide_read_ireason(drive);
|
|
if (drive->media == ide_tape)
|
|
ireason = ide_wait_ireason(drive, ireason);
|
|
|
|
if ((ireason & ATAPI_COD) == 0 || (ireason & ATAPI_IO)) {
|
|
printk(KERN_ERR "%s: (IO,CoD) != (0,1) while issuing "
|
|
"a packet command\n", drive->name);
|
|
|
|
return ide_do_reset(drive);
|
|
}
|
|
}
|
|
|
|
/* Set the interrupt routine */
|
|
ide_set_handler(drive,
|
|
(dev_is_idecd(drive) ? drive->irq_handler
|
|
: ide_pc_intr),
|
|
timeout, expiry);
|
|
|
|
/* Begin DMA, if necessary */
|
|
if (dev_is_idecd(drive)) {
|
|
if (drive->dma)
|
|
hwif->dma_ops->dma_start(drive);
|
|
} else {
|
|
if (pc->flags & PC_FLAG_DMA_OK) {
|
|
pc->flags |= PC_FLAG_DMA_IN_PROGRESS;
|
|
hwif->dma_ops->dma_start(drive);
|
|
}
|
|
}
|
|
|
|
/* Send the actual packet */
|
|
if ((drive->atapi_flags & IDE_AFLAG_ZIP_DRIVE) == 0)
|
|
hwif->tp_ops->output_data(drive, NULL, rq->cmd, cmd_len);
|
|
|
|
return ide_started;
|
|
}
|
|
|
|
ide_startstop_t ide_issue_pc(ide_drive_t *drive)
|
|
{
|
|
struct ide_atapi_pc *pc;
|
|
ide_hwif_t *hwif = drive->hwif;
|
|
ide_expiry_t *expiry = NULL;
|
|
unsigned int timeout;
|
|
u32 tf_flags;
|
|
u16 bcount;
|
|
|
|
if (dev_is_idecd(drive)) {
|
|
tf_flags = IDE_TFLAG_OUT_NSECT | IDE_TFLAG_OUT_LBAL;
|
|
bcount = ide_cd_get_xferlen(hwif->rq);
|
|
expiry = ide_cd_expiry;
|
|
timeout = ATAPI_WAIT_PC;
|
|
|
|
if (drive->dma)
|
|
drive->dma = !hwif->dma_ops->dma_setup(drive);
|
|
} else {
|
|
pc = drive->pc;
|
|
|
|
/* We haven't transferred any data yet */
|
|
pc->xferred = 0;
|
|
pc->cur_pos = pc->buf;
|
|
|
|
tf_flags = IDE_TFLAG_OUT_DEVICE;
|
|
bcount = ((drive->media == ide_tape) ?
|
|
pc->req_xfer :
|
|
min(pc->req_xfer, 63 * 1024));
|
|
|
|
if (pc->flags & PC_FLAG_DMA_ERROR) {
|
|
pc->flags &= ~PC_FLAG_DMA_ERROR;
|
|
ide_dma_off(drive);
|
|
}
|
|
|
|
if ((pc->flags & PC_FLAG_DMA_OK) &&
|
|
(drive->dev_flags & IDE_DFLAG_USING_DMA))
|
|
drive->dma = !hwif->dma_ops->dma_setup(drive);
|
|
|
|
if (!drive->dma)
|
|
pc->flags &= ~PC_FLAG_DMA_OK;
|
|
|
|
timeout = (drive->media == ide_floppy) ? WAIT_FLOPPY_CMD
|
|
: WAIT_TAPE_CMD;
|
|
}
|
|
|
|
ide_pktcmd_tf_load(drive, tf_flags, bcount, drive->dma);
|
|
|
|
/* Issue the packet command */
|
|
if (drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT) {
|
|
if (drive->dma)
|
|
drive->waiting_for_dma = 0;
|
|
ide_execute_command(drive, ATA_CMD_PACKET, ide_transfer_pc,
|
|
timeout, expiry);
|
|
return ide_started;
|
|
} else {
|
|
ide_execute_pkt_cmd(drive);
|
|
return ide_transfer_pc(drive);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(ide_issue_pc);
|