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1626 |
jcastillo |
/*
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* linux/drivers/scsi/ide-scsi.c Version 0.32 May 21, 1998
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*
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* Copyright (C) 1996, 1997 Gadi Oxman <gadio@netvision.net.il>
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*/
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/*
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* Emulation of a SCSI host adapter for IDE ATAPI devices.
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*
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* With this driver, one can use the Linux SCSI drivers instead of the
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* native IDE ATAPI drivers.
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*
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* Ver 0.1 Dec 3 96 Initial version.
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* Ver 0.2 Jan 26 97 Fixed bug in cleanup_module() and added emulation
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* of MODE_SENSE_6/MODE_SELECT_6 for cdroms. Thanks
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* to Janos Farkas for pointing this out.
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* Avoid using bitfields in structures for m68k.
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* Added Scather/Gather and DMA support.
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* Ver 0.3 Jul 24 97 Add support for ATAPI PD/CD drives.
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* Ver 0.31 Apr 3 98 Remove buggy MODE_SENSE6/MODE_SELECT6 translation.
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* Add variable irq timeout support.
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* Ver 0.32 May 21 98 Perform maximal data transfer when the drive wants
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* to send us more data than would fit in our buffer.
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/string.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/ioport.h>
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#include <linux/blkdev.h>
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#include <linux/errno.h>
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#include <linux/hdreg.h>
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#include <linux/malloc.h>
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#include <asm/io.h>
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#include <asm/bitops.h>
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#include "../block/ide.h"
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#include "scsi.h"
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#include "hosts.h"
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#include "sd.h"
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#include "ide-scsi.h"
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#define IDESCSI_DEBUG_LOG 0
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typedef struct idescsi_pc_s {
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u8 c[12]; /* Actual packet bytes */
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int request_transfer; /* Bytes to transfer */
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int actually_transferred; /* Bytes actually transferred */
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int buffer_size; /* Size of our data buffer */
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struct request *rq; /* The corresponding request */
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byte *buffer; /* Data buffer */
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byte *current_position; /* Pointer into the above buffer */
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struct scatterlist *sg; /* Scather gather table */
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int b_count; /* Bytes transferred from current entry */
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Scsi_Cmnd *scsi_cmd; /* SCSI command */
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void (*done)(Scsi_Cmnd *); /* Scsi completion routine */
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unsigned int flags; /* Status/Action flags */
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unsigned long timeout; /* Command timeout */
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} idescsi_pc_t;
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/*
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* Packet command status bits.
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*/
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#define PC_DMA_IN_PROGRESS 0 /* 1 while DMA in progress */
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#define PC_WRITING 1 /* Data direction */
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typedef struct {
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ide_drive_t *drive;
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idescsi_pc_t *pc; /* Current packet command */
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unsigned int flags; /* Status/Action flags */
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int media;
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} idescsi_scsi_t;
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/*
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* Per ATAPI device status bits.
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*/
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#define IDESCSI_DRQ_INTERRUPT 0 /* DRQ interrupt device */
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/*
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* ide-scsi requests.
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*/
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#define IDESCSI_PC_RQ 90
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/*
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* Bits of the interrupt reason register.
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*/
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#define IDESCSI_IREASON_COD 0x1 /* Information transferred is command */
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#define IDESCSI_IREASON_IO 0x2 /* The device requests us to read */
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#define IDE_MIN(a,b) ((a)<(b) ? (a):(b))
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#define IDE_MAX(a,b) ((a)>(b) ? (a):(b))
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static void idescsi_discard_data (ide_drive_t *drive, unsigned int bcount)
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{
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while (bcount--)
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IN_BYTE (IDE_DATA_REG);
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}
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static void idescsi_output_zeros (ide_drive_t *drive, unsigned int bcount)
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{
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while (bcount--)
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OUT_BYTE (0, IDE_DATA_REG);
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}
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/*
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* PIO data transfer routines using the scather gather table.
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*/
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static void idescsi_input_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigned int bcount)
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{
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int count;
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while (bcount) {
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if (pc->sg - (struct scatterlist *) pc->scsi_cmd->request_buffer > pc->scsi_cmd->use_sg) {
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printk (KERN_ERR "ide-scsi: scather gather table too small, discarding data\n");
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idescsi_discard_data (drive, bcount);
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return;
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}
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count = IDE_MIN (pc->sg->length - pc->b_count, bcount);
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atapi_input_bytes (drive, pc->sg->address + pc->b_count, count);
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bcount -= count; pc->b_count += count;
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if (pc->b_count == pc->sg->length) {
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pc->sg++;
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pc->b_count = 0;
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}
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}
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}
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static void idescsi_output_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigned int bcount)
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{
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int count;
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while (bcount) {
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if (pc->sg - (struct scatterlist *) pc->scsi_cmd->request_buffer > pc->scsi_cmd->use_sg) {
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printk (KERN_ERR "ide-scsi: scather gather table too small, padding with zeros\n");
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idescsi_output_zeros (drive, bcount);
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return;
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}
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count = IDE_MIN (pc->sg->length - pc->b_count, bcount);
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atapi_output_bytes (drive, pc->sg->address + pc->b_count, count);
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bcount -= count; pc->b_count += count;
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if (pc->b_count == pc->sg->length) {
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pc->sg++;
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pc->b_count = 0;
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}
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}
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}
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/*
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* Most of the SCSI commands are supported directly by ATAPI devices.
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* idescsi_transform_pc handles the few exceptions.
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*/
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static inline void idescsi_transform_pc1 (ide_drive_t *drive, idescsi_pc_t *pc)
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{
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idescsi_scsi_t *scsi = drive->scsi;
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u8 *c = pc->c;
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if (scsi->media == TYPE_ROM) {
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if (c[0] == READ_6 || c[0] == WRITE_6) {
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c[8] = c[4]; c[5] = c[3]; c[4] = c[2];
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c[3] = c[1] & 0x1f; c[2] = 0; c[1] &= 0xe0;
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c[0] += (READ_10 - READ_6);
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}
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}
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}
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static inline void idescsi_transform_pc2 (ide_drive_t *drive, idescsi_pc_t *pc)
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{
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idescsi_scsi_t *scsi = drive->scsi;
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u8 *buf = pc->buffer;
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if (scsi->media == TYPE_ROM) {
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if (pc->c[0] == INQUIRY)
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buf[2] |= 2;
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}
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}
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static inline void idescsi_free_bh (struct buffer_head *bh)
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{
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struct buffer_head *bhp;
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while (bh) {
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bhp = bh;
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bh = bh->b_reqnext;
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kfree (bhp);
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}
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}
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void idescsi_end_request (byte uptodate, ide_hwgroup_t *hwgroup)
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{
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ide_drive_t *drive = hwgroup->drive;
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idescsi_scsi_t *scsi = drive->scsi;
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struct request *rq = hwgroup->rq;
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idescsi_pc_t *pc = (idescsi_pc_t *) rq->buffer;
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if (rq->cmd != IDESCSI_PC_RQ) {
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ide_end_request (uptodate, hwgroup);
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return;
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}
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ide_end_drive_cmd (drive, 0, 0);
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if (rq->errors >= ERROR_MAX) {
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#if IDESCSI_DEBUG_LOG
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printk ("ide-scsi: %s: I/O error for %lu\n", drive->name, pc->scsi_cmd->serial_number);
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#endif /* IDESCSI_DEBUG_LOG */
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pc->scsi_cmd->result = DID_ERROR << 16;
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} else if (rq->errors) {
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#if IDESCSI_DEBUG_LOG
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printk ("ide-scsi: %s: check condition for %lu\n", drive->name, pc->scsi_cmd->serial_number);
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#endif /* IDESCSI_DEBUG_LOG */
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pc->scsi_cmd->result = (CHECK_CONDITION << 1) | (DID_OK << 16);
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} else {
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#if IDESCSI_DEBUG_LOG
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printk ("ide-scsi: %s: success for %lu\n", drive->name, pc->scsi_cmd->serial_number);
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#endif /* IDESCSI_DEBUG_LOG */
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pc->scsi_cmd->result = DID_OK << 16;
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idescsi_transform_pc2 (drive, pc);
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}
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pc->done(pc->scsi_cmd);
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idescsi_free_bh (rq->bh);
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kfree(pc); kfree(rq);
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scsi->pc = NULL;
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}
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| 227 |
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static inline unsigned long get_timeout(idescsi_pc_t *pc)
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{
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return IDE_MAX(WAIT_CMD, pc->timeout - jiffies);
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}
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| 231 |
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| 232 |
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/*
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* Our interrupt handler.
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*/
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static void idescsi_pc_intr (ide_drive_t *drive)
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{
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idescsi_scsi_t *scsi = drive->scsi;
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byte status, ireason;
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int bcount;
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| 240 |
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idescsi_pc_t *pc=scsi->pc;
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struct request *rq = pc->rq;
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unsigned int temp;
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| 243 |
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#if IDESCSI_DEBUG_LOG
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printk (KERN_INFO "ide-scsi: Reached idescsi_pc_intr interrupt handler\n");
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#endif /* IDESCSI_DEBUG_LOG */
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| 247 |
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| 248 |
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if (clear_bit (PC_DMA_IN_PROGRESS, &pc->flags)) {
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| 249 |
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#if IDESCSI_DEBUG_LOG
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| 250 |
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printk ("ide-scsi: %s: DMA complete\n", drive->name);
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| 251 |
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#endif /* IDESCSI_DEBUG_LOG */
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| 252 |
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pc->actually_transferred=pc->request_transfer;
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| 253 |
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(void) (HWIF(drive)->dmaproc(ide_dma_abort, drive));
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| 254 |
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}
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| 256 |
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status = GET_STAT(); /* Clear the interrupt */
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| 257 |
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| 258 |
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if ((status & DRQ_STAT) == 0) { /* No more interrupts */
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| 259 |
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#if IDESCSI_DEBUG_LOG
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| 260 |
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printk (KERN_INFO "Packet command completed, %d bytes transferred\n", pc->actually_transferred);
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| 261 |
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#endif /* IDESCSI_DEBUG_LOG */
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| 262 |
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sti();
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| 263 |
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if (status & ERR_STAT)
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| 264 |
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rq->errors++;
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| 265 |
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idescsi_end_request (1, HWGROUP(drive));
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| 266 |
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return;
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| 267 |
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}
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| 268 |
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bcount = IN_BYTE (IDE_BCOUNTH_REG) << 8 | IN_BYTE (IDE_BCOUNTL_REG);
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| 269 |
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ireason = IN_BYTE (IDE_IREASON_REG);
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| 270 |
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| 271 |
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if (ireason & IDESCSI_IREASON_COD) {
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| 272 |
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printk (KERN_ERR "ide-scsi: CoD != 0 in idescsi_pc_intr\n");
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| 273 |
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ide_do_reset (drive);
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| 274 |
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return;
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| 275 |
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}
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| 276 |
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if (ireason & IDESCSI_IREASON_IO) {
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| 277 |
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temp = pc->actually_transferred + bcount;
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| 278 |
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if ( temp > pc->request_transfer) {
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| 279 |
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if (temp > pc->buffer_size) {
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| 280 |
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printk (KERN_ERR "ide-scsi: The scsi wants to send us more data than expected - discarding data\n");
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| 281 |
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temp = pc->buffer_size - pc->actually_transferred;
|
| 282 |
|
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if (temp) {
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| 283 |
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clear_bit(PC_WRITING, &pc->flags);
|
| 284 |
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if (pc->sg)
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| 285 |
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idescsi_input_buffers(drive, pc, temp);
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| 286 |
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else
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| 287 |
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atapi_input_bytes(drive, pc->current_position, temp);
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| 288 |
|
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printk(KERN_ERR "ide-scsi: transferred %d of %d bytes\n", temp, bcount);
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| 289 |
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}
|
| 290 |
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pc->actually_transferred += temp;
|
| 291 |
|
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pc->current_position += temp;
|
| 292 |
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idescsi_discard_data (drive,bcount - temp);
|
| 293 |
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ide_set_handler (drive, &idescsi_pc_intr, get_timeout(pc));
|
| 294 |
|
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return;
|
| 295 |
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}
|
| 296 |
|
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#if IDESCSI_DEBUG_LOG
|
| 297 |
|
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printk (KERN_NOTICE "ide-scsi: The scsi wants to send us more data than expected - allowing transfer\n");
|
| 298 |
|
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#endif /* IDESCSI_DEBUG_LOG */
|
| 299 |
|
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}
|
| 300 |
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}
|
| 301 |
|
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if (ireason & IDESCSI_IREASON_IO) {
|
| 302 |
|
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if (pc->sg)
|
| 303 |
|
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idescsi_input_buffers (drive, pc, bcount);
|
| 304 |
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else
|
| 305 |
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atapi_input_bytes (drive,pc->current_position,bcount);
|
| 306 |
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} else {
|
| 307 |
|
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if (pc->sg)
|
| 308 |
|
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idescsi_output_buffers (drive, pc, bcount);
|
| 309 |
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else
|
| 310 |
|
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atapi_output_bytes (drive,pc->current_position,bcount);
|
| 311 |
|
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}
|
| 312 |
|
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pc->actually_transferred+=bcount; /* Update the current position */
|
| 313 |
|
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pc->current_position+=bcount;
|
| 314 |
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|
| 315 |
|
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ide_set_handler (drive,&idescsi_pc_intr,get_timeout(pc)); /* And set the interrupt handler again */
|
| 316 |
|
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}
|
| 317 |
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|
| 318 |
|
|
static void idescsi_transfer_pc (ide_drive_t *drive)
|
| 319 |
|
|
{
|
| 320 |
|
|
idescsi_scsi_t *scsi = drive->scsi;
|
| 321 |
|
|
idescsi_pc_t *pc=scsi->pc;
|
| 322 |
|
|
byte ireason;
|
| 323 |
|
|
|
| 324 |
|
|
if (ide_wait_stat (drive,DRQ_STAT,BUSY_STAT,WAIT_READY)) {
|
| 325 |
|
|
printk (KERN_ERR "ide-scsi: Strange, packet command initiated yet DRQ isn't asserted\n");
|
| 326 |
|
|
return;
|
| 327 |
|
|
}
|
| 328 |
|
|
ireason = IN_BYTE (IDE_IREASON_REG);
|
| 329 |
|
|
if ((ireason & (IDESCSI_IREASON_IO | IDESCSI_IREASON_COD)) != IDESCSI_IREASON_COD) {
|
| 330 |
|
|
printk (KERN_ERR "ide-scsi: (IO,CoD) != (0,1) while issuing a packet command\n");
|
| 331 |
|
|
ide_do_reset (drive);
|
| 332 |
|
|
return;
|
| 333 |
|
|
}
|
| 334 |
|
|
ide_set_handler (drive, &idescsi_pc_intr, get_timeout(pc)); /* Set the interrupt routine */
|
| 335 |
|
|
atapi_output_bytes (drive, scsi->pc->c, 12); /* Send the actual packet */
|
| 336 |
|
|
}
|
| 337 |
|
|
|
| 338 |
|
|
/*
|
| 339 |
|
|
* Issue a packet command
|
| 340 |
|
|
*/
|
| 341 |
|
|
static void idescsi_issue_pc (ide_drive_t *drive, idescsi_pc_t *pc)
|
| 342 |
|
|
{
|
| 343 |
|
|
idescsi_scsi_t *scsi = drive->scsi;
|
| 344 |
|
|
int bcount;
|
| 345 |
|
|
struct request *rq = pc->rq;
|
| 346 |
|
|
int dma_ok = 0;
|
| 347 |
|
|
|
| 348 |
|
|
scsi->pc=pc; /* Set the current packet command */
|
| 349 |
|
|
pc->actually_transferred=0; /* We haven't transferred any data yet */
|
| 350 |
|
|
pc->current_position=pc->buffer;
|
| 351 |
|
|
bcount = IDE_MIN (pc->request_transfer, 63 * 1024); /* Request to transfer the entire buffer at once */
|
| 352 |
|
|
|
| 353 |
|
|
if (drive->using_dma && rq->bh)
|
| 354 |
|
|
dma_ok=!HWIF(drive)->dmaproc(test_bit (PC_WRITING, &pc->flags) ? ide_dma_write : ide_dma_read, drive);
|
| 355 |
|
|
|
| 356 |
|
|
OUT_BYTE (drive->ctl,IDE_CONTROL_REG);
|
| 357 |
|
|
OUT_BYTE (dma_ok,IDE_FEATURE_REG);
|
| 358 |
|
|
OUT_BYTE (bcount >> 8,IDE_BCOUNTH_REG);
|
| 359 |
|
|
OUT_BYTE (bcount & 0xff,IDE_BCOUNTL_REG);
|
| 360 |
|
|
OUT_BYTE (drive->select.all,IDE_SELECT_REG);
|
| 361 |
|
|
|
| 362 |
|
|
if (dma_ok) {
|
| 363 |
|
|
set_bit (PC_DMA_IN_PROGRESS, &pc->flags);
|
| 364 |
|
|
(void) (HWIF(drive)->dmaproc(ide_dma_begin, drive));
|
| 365 |
|
|
}
|
| 366 |
|
|
if (test_bit (IDESCSI_DRQ_INTERRUPT, &scsi->flags)) {
|
| 367 |
|
|
ide_set_handler (drive, &idescsi_transfer_pc, get_timeout(pc));
|
| 368 |
|
|
OUT_BYTE (WIN_PACKETCMD, IDE_COMMAND_REG); /* Issue the packet command */
|
| 369 |
|
|
} else {
|
| 370 |
|
|
OUT_BYTE (WIN_PACKETCMD, IDE_COMMAND_REG);
|
| 371 |
|
|
idescsi_transfer_pc (drive);
|
| 372 |
|
|
}
|
| 373 |
|
|
}
|
| 374 |
|
|
|
| 375 |
|
|
/*
|
| 376 |
|
|
* idescsi_do_request is our request handling function.
|
| 377 |
|
|
*/
|
| 378 |
|
|
void idescsi_do_request (ide_drive_t *drive, struct request *rq, unsigned long block)
|
| 379 |
|
|
{
|
| 380 |
|
|
#if IDESCSI_DEBUG_LOG
|
| 381 |
|
|
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);
|
| 382 |
|
|
printk (KERN_INFO "sector: %ld, nr_sectors: %ld, current_nr_sectors: %ld\n",rq->sector,rq->nr_sectors,rq->current_nr_sectors);
|
| 383 |
|
|
#endif /* IDESCSI_DEBUG_LOG */
|
| 384 |
|
|
|
| 385 |
|
|
if (rq->cmd == IDESCSI_PC_RQ) {
|
| 386 |
|
|
idescsi_issue_pc (drive, (idescsi_pc_t *) rq->buffer);
|
| 387 |
|
|
return;
|
| 388 |
|
|
}
|
| 389 |
|
|
printk (KERN_ERR "ide-scsi: %s: unsupported command in request queue (%x)\n", drive->name, rq->cmd);
|
| 390 |
|
|
idescsi_end_request (0,HWGROUP (drive));
|
| 391 |
|
|
}
|
| 392 |
|
|
|
| 393 |
|
|
int idescsi_open (struct inode *inode, struct file *filp, ide_drive_t *drive)
|
| 394 |
|
|
{
|
| 395 |
|
|
MOD_INC_USE_COUNT;
|
| 396 |
|
|
return 0;
|
| 397 |
|
|
}
|
| 398 |
|
|
|
| 399 |
|
|
void idescsi_ide_release (struct inode *inode, struct file *filp, ide_drive_t *drive)
|
| 400 |
|
|
{
|
| 401 |
|
|
MOD_DEC_USE_COUNT;
|
| 402 |
|
|
}
|
| 403 |
|
|
|
| 404 |
|
|
static ide_drive_t *idescsi_drives[MAX_HWIFS * MAX_DRIVES];
|
| 405 |
|
|
static int idescsi_initialized = 0;
|
| 406 |
|
|
|
| 407 |
|
|
int idescsi_ioctl (ide_drive_t *drive, struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
|
| 408 |
|
|
{
|
| 409 |
|
|
return -EINVAL;
|
| 410 |
|
|
}
|
| 411 |
|
|
|
| 412 |
|
|
static struct proc_dir_entry idescsi_proc_dir = {PROC_SCSI_IDESCSI, 8, "ide-scsi", S_IFDIR | S_IRUGO | S_IXUGO, 2};
|
| 413 |
|
|
|
| 414 |
|
|
/*
|
| 415 |
|
|
* idescsi_setup will register the driver for each scsi.
|
| 416 |
|
|
*/
|
| 417 |
|
|
void idescsi_setup (ide_drive_t *drive)
|
| 418 |
|
|
{
|
| 419 |
|
|
idescsi_scsi_t *scsi;
|
| 420 |
|
|
int i, id;
|
| 421 |
|
|
|
| 422 |
|
|
if (!idescsi_initialized) {
|
| 423 |
|
|
idescsi_initialized = 1;
|
| 424 |
|
|
for (i = 0; i < MAX_HWIFS * MAX_DRIVES; i++)
|
| 425 |
|
|
idescsi_drives[i] = NULL;
|
| 426 |
|
|
}
|
| 427 |
|
|
if ((scsi = (idescsi_scsi_t *) kmalloc (sizeof (idescsi_scsi_t), GFP_KERNEL)) == NULL) {
|
| 428 |
|
|
printk (KERN_ERR "ide-scsi: %s: Can't allocate a scsi structure\n", drive->name);
|
| 429 |
|
|
return;
|
| 430 |
|
|
}
|
| 431 |
|
|
for (id = 0; id < MAX_HWIFS * MAX_DRIVES && idescsi_drives[id]; id++);
|
| 432 |
|
|
idescsi_drives[id] = drive;
|
| 433 |
|
|
drive->scsi = scsi;
|
| 434 |
|
|
drive->ready_stat = 0;
|
| 435 |
|
|
memset (scsi, 0, sizeof (idescsi_scsi_t));
|
| 436 |
|
|
scsi->drive = drive;
|
| 437 |
|
|
scsi->media = (drive->id->config >> 8) & 0x1f;
|
| 438 |
|
|
if (drive->id && (drive->id->config & 0x0060) == 0x20)
|
| 439 |
|
|
set_bit (IDESCSI_DRQ_INTERRUPT, &scsi->flags);
|
| 440 |
|
|
printk ("ATAPI overlap supported: %s\n",
|
| 441 |
|
|
drive->id->capability & 0x20 ? "Yes" : "No");
|
| 442 |
|
|
}
|
| 443 |
|
|
|
| 444 |
|
|
int idescsi_detect (Scsi_Host_Template *host_template)
|
| 445 |
|
|
{
|
| 446 |
|
|
struct Scsi_Host *host;
|
| 447 |
|
|
int id;
|
| 448 |
|
|
|
| 449 |
|
|
host_template->proc_dir = &idescsi_proc_dir;
|
| 450 |
|
|
host = scsi_register(host_template, 0);
|
| 451 |
|
|
for (id = 0; id < MAX_HWIFS * MAX_DRIVES && idescsi_drives[id]; id++);
|
| 452 |
|
|
host->max_id = id;
|
| 453 |
|
|
host->can_queue = host->cmd_per_lun * id;
|
| 454 |
|
|
return 1;
|
| 455 |
|
|
}
|
| 456 |
|
|
|
| 457 |
|
|
int idescsi_release (struct Scsi_Host *host)
|
| 458 |
|
|
{
|
| 459 |
|
|
return 0;
|
| 460 |
|
|
}
|
| 461 |
|
|
|
| 462 |
|
|
const char *idescsi_info (struct Scsi_Host *host)
|
| 463 |
|
|
{
|
| 464 |
|
|
return "SCSI host adapter emulation for IDE ATAPI devices";
|
| 465 |
|
|
}
|
| 466 |
|
|
|
| 467 |
|
|
static inline struct buffer_head *idescsi_kmalloc_bh (int count)
|
| 468 |
|
|
{
|
| 469 |
|
|
struct buffer_head *bh, *bhp, *first_bh;
|
| 470 |
|
|
|
| 471 |
|
|
if ((first_bh = bhp = bh = kmalloc (sizeof(struct buffer_head), GFP_ATOMIC)) == NULL)
|
| 472 |
|
|
goto abort;
|
| 473 |
|
|
memset (bh, 0, sizeof (struct buffer_head));
|
| 474 |
|
|
bh->b_reqnext = NULL;
|
| 475 |
|
|
while (--count) {
|
| 476 |
|
|
if ((bh = kmalloc (sizeof(struct buffer_head), GFP_ATOMIC)) == NULL)
|
| 477 |
|
|
goto abort;
|
| 478 |
|
|
memset (bh, 0, sizeof (struct buffer_head));
|
| 479 |
|
|
bhp->b_reqnext = bh;
|
| 480 |
|
|
bhp = bh;
|
| 481 |
|
|
bh->b_reqnext = NULL;
|
| 482 |
|
|
}
|
| 483 |
|
|
return first_bh;
|
| 484 |
|
|
abort:
|
| 485 |
|
|
idescsi_free_bh (first_bh);
|
| 486 |
|
|
return NULL;
|
| 487 |
|
|
}
|
| 488 |
|
|
|
| 489 |
|
|
static inline int idescsi_set_direction (idescsi_pc_t *pc)
|
| 490 |
|
|
{
|
| 491 |
|
|
switch (pc->c[0]) {
|
| 492 |
|
|
case READ_6: case READ_10: case READ_12:
|
| 493 |
|
|
clear_bit (PC_WRITING, &pc->flags);
|
| 494 |
|
|
return 0;
|
| 495 |
|
|
case WRITE_6: case WRITE_10: case WRITE_12:
|
| 496 |
|
|
set_bit (PC_WRITING, &pc->flags);
|
| 497 |
|
|
return 0;
|
| 498 |
|
|
default:
|
| 499 |
|
|
return 1;
|
| 500 |
|
|
}
|
| 501 |
|
|
}
|
| 502 |
|
|
|
| 503 |
|
|
static inline struct buffer_head *idescsi_dma_bh (ide_drive_t *drive, idescsi_pc_t *pc)
|
| 504 |
|
|
{
|
| 505 |
|
|
struct buffer_head *bh = NULL, *first_bh = NULL;
|
| 506 |
|
|
int segments = pc->scsi_cmd->use_sg;
|
| 507 |
|
|
struct scatterlist *sg = pc->scsi_cmd->request_buffer;
|
| 508 |
|
|
|
| 509 |
|
|
if (!drive->using_dma || pc->request_transfer % 1024)
|
| 510 |
|
|
return NULL;
|
| 511 |
|
|
if (idescsi_set_direction(pc))
|
| 512 |
|
|
return NULL;
|
| 513 |
|
|
if (segments) {
|
| 514 |
|
|
if ((first_bh = bh = idescsi_kmalloc_bh (segments)) == NULL)
|
| 515 |
|
|
return NULL;
|
| 516 |
|
|
#if IDESCSI_DEBUG_LOG
|
| 517 |
|
|
printk ("ide-scsi: %s: building DMA table, %d segments, %dkB total\n", drive->name, segments, pc->request_transfer >> 10);
|
| 518 |
|
|
#endif /* IDESCSI_DEBUG_LOG */
|
| 519 |
|
|
while (segments--) {
|
| 520 |
|
|
bh->b_data = sg->address;
|
| 521 |
|
|
bh->b_size = sg->length;
|
| 522 |
|
|
bh = bh->b_reqnext;
|
| 523 |
|
|
sg++;
|
| 524 |
|
|
}
|
| 525 |
|
|
} else {
|
| 526 |
|
|
if ((first_bh = bh = idescsi_kmalloc_bh (1)) == NULL)
|
| 527 |
|
|
return NULL;
|
| 528 |
|
|
#if IDESCSI_DEBUG_LOG
|
| 529 |
|
|
printk ("ide-scsi: %s: building DMA table for a single buffer (%dkB)\n", drive->name, pc->request_transfer >> 10);
|
| 530 |
|
|
#endif /* IDESCSI_DEBUG_LOG */
|
| 531 |
|
|
bh->b_data = pc->scsi_cmd->request_buffer;
|
| 532 |
|
|
bh->b_size = pc->request_transfer;
|
| 533 |
|
|
}
|
| 534 |
|
|
return first_bh;
|
| 535 |
|
|
}
|
| 536 |
|
|
|
| 537 |
|
|
int idescsi_queue (Scsi_Cmnd *cmd, void (*done)(Scsi_Cmnd *))
|
| 538 |
|
|
{
|
| 539 |
|
|
ide_drive_t *drive = idescsi_drives[cmd->target];
|
| 540 |
|
|
struct request *rq = NULL;
|
| 541 |
|
|
idescsi_pc_t *pc = NULL;
|
| 542 |
|
|
|
| 543 |
|
|
#if IDESCSI_DEBUG_LOG
|
| 544 |
|
|
printk ("idescsi_queue called, serial = %lu, cmd[0] = %x, id = %d\n", cmd->serial_number, cmd->cmnd[0], cmd->target);
|
| 545 |
|
|
#endif /* IDESCSI_DEBUG_LOG */
|
| 546 |
|
|
|
| 547 |
|
|
if (!drive) {
|
| 548 |
|
|
printk (KERN_ERR "ide-scsi: drive id %d not present\n", cmd->target);
|
| 549 |
|
|
goto abort;
|
| 550 |
|
|
}
|
| 551 |
|
|
pc = kmalloc (sizeof (idescsi_pc_t), GFP_ATOMIC);
|
| 552 |
|
|
rq = kmalloc (sizeof (struct request), GFP_ATOMIC);
|
| 553 |
|
|
if (rq == NULL || pc == NULL) {
|
| 554 |
|
|
printk (KERN_ERR "ide-scsi: %s: out of memory\n", drive->name);
|
| 555 |
|
|
goto abort;
|
| 556 |
|
|
}
|
| 557 |
|
|
|
| 558 |
|
|
memset (pc->c, 0, 12);
|
| 559 |
|
|
pc->flags = 0;
|
| 560 |
|
|
pc->rq = rq;
|
| 561 |
|
|
memcpy (pc->c, cmd->cmnd, cmd->cmd_len);
|
| 562 |
|
|
if (cmd->use_sg) {
|
| 563 |
|
|
pc->buffer = NULL;
|
| 564 |
|
|
pc->sg = cmd->request_buffer;
|
| 565 |
|
|
} else {
|
| 566 |
|
|
pc->buffer = cmd->request_buffer;
|
| 567 |
|
|
pc->sg = NULL;
|
| 568 |
|
|
}
|
| 569 |
|
|
pc->b_count = 0;
|
| 570 |
|
|
pc->request_transfer = pc->buffer_size = cmd->request_bufflen;
|
| 571 |
|
|
pc->scsi_cmd = cmd;
|
| 572 |
|
|
pc->done = done;
|
| 573 |
|
|
pc->timeout = jiffies + cmd->timeout_per_command;
|
| 574 |
|
|
idescsi_transform_pc1 (drive, pc);
|
| 575 |
|
|
|
| 576 |
|
|
ide_init_drive_cmd (rq);
|
| 577 |
|
|
rq->buffer = (char *) pc;
|
| 578 |
|
|
rq->bh = idescsi_dma_bh (drive, pc);
|
| 579 |
|
|
rq->cmd = IDESCSI_PC_RQ;
|
| 580 |
|
|
(void) ide_do_drive_cmd (drive, rq, ide_end);
|
| 581 |
|
|
return 0;
|
| 582 |
|
|
abort:
|
| 583 |
|
|
if (pc) kfree (pc);
|
| 584 |
|
|
if (rq) kfree (rq);
|
| 585 |
|
|
cmd->result = DID_ERROR << 16;
|
| 586 |
|
|
done(cmd);
|
| 587 |
|
|
return 0;
|
| 588 |
|
|
}
|
| 589 |
|
|
|
| 590 |
|
|
int idescsi_abort (Scsi_Cmnd *cmd)
|
| 591 |
|
|
{
|
| 592 |
|
|
return SCSI_ABORT_SNOOZE;
|
| 593 |
|
|
}
|
| 594 |
|
|
|
| 595 |
|
|
int idescsi_reset (Scsi_Cmnd *cmd, unsigned int resetflags)
|
| 596 |
|
|
{
|
| 597 |
|
|
return SCSI_RESET_PUNT;
|
| 598 |
|
|
}
|
| 599 |
|
|
|
| 600 |
|
|
int idescsi_bios (Disk *disk, kdev_t dev, int *parm)
|
| 601 |
|
|
{
|
| 602 |
|
|
ide_drive_t *drive = idescsi_drives[disk->device->id];
|
| 603 |
|
|
|
| 604 |
|
|
if (drive->cyl && drive->head && drive->sect) {
|
| 605 |
|
|
parm[0] = drive->head;
|
| 606 |
|
|
parm[1] = drive->sect;
|
| 607 |
|
|
parm[2] = drive->cyl;
|
| 608 |
|
|
}
|
| 609 |
|
|
return 0;
|
| 610 |
|
|
}
|
