5 #include <linux/kernel.h>
6 #include <linux/delay.h>
11 #define debug_log(fmt, args...) \
12 printk(KERN_INFO "ide: " fmt, ## args)
14 #define debug_log(fmt, args...) do {} while (0)
18 * Check whether we can support a device,
19 * based on the ATAPI IDENTIFY command results.
21 int ide_check_atapi_device(ide_drive_t *drive, const char *s)
24 u8 gcw[2], protocol, device_type, removable, drq_type, packet_size;
26 *((u16 *)&gcw) = id[ATA_ID_CONFIG];
28 protocol = (gcw[1] & 0xC0) >> 6;
29 device_type = gcw[1] & 0x1F;
30 removable = (gcw[0] & 0x80) >> 7;
31 drq_type = (gcw[0] & 0x60) >> 5;
32 packet_size = gcw[0] & 0x03;
35 /* kludge for Apple PowerBook internal zip */
36 if (drive->media == ide_floppy && device_type == 5 &&
37 !strstr((char *)&id[ATA_ID_PROD], "CD-ROM") &&
38 strstr((char *)&id[ATA_ID_PROD], "ZIP"))
43 printk(KERN_ERR "%s: %s: protocol (0x%02x) is not ATAPI\n",
44 s, drive->name, protocol);
45 else if ((drive->media == ide_floppy && device_type != 0) ||
46 (drive->media == ide_tape && device_type != 1))
47 printk(KERN_ERR "%s: %s: invalid device type (0x%02x)\n",
48 s, drive->name, device_type);
49 else if (removable == 0)
50 printk(KERN_ERR "%s: %s: the removable flag is not set\n",
52 else if (drive->media == ide_floppy && drq_type == 3)
53 printk(KERN_ERR "%s: %s: sorry, DRQ type (0x%02x) not "
54 "supported\n", s, drive->name, drq_type);
55 else if (packet_size != 0)
56 printk(KERN_ERR "%s: %s: packet size (0x%02x) is not 12 "
57 "bytes\n", s, drive->name, packet_size);
62 EXPORT_SYMBOL_GPL(ide_check_atapi_device);
64 /* TODO: unify the code thus making some arguments go away */
65 ide_startstop_t ide_pc_intr(ide_drive_t *drive, struct ide_atapi_pc *pc,
66 ide_handler_t *handler, unsigned int timeout, ide_expiry_t *expiry,
67 void (*update_buffers)(ide_drive_t *, struct ide_atapi_pc *),
68 void (*retry_pc)(ide_drive_t *), void (*dsc_handle)(ide_drive_t *),
69 void (*io_buffers)(ide_drive_t *, struct ide_atapi_pc *, unsigned, int))
71 ide_hwif_t *hwif = drive->hwif;
72 struct request *rq = hwif->hwgroup->rq;
73 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
74 xfer_func_t *xferfunc;
77 u8 stat, ireason, scsi = drive->scsi;
79 debug_log("Enter %s - interrupt handler\n", __func__);
81 if (pc->flags & PC_FLAG_TIMEDOUT) {
82 drive->pc_callback(drive);
86 /* Clear the interrupt */
87 stat = tp_ops->read_status(hwif);
89 if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
90 if (hwif->dma_ops->dma_end(drive) ||
91 (drive->media == ide_tape && !scsi && (stat & ATA_ERR))) {
92 if (drive->media == ide_floppy && !scsi)
93 printk(KERN_ERR "%s: DMA %s error\n",
94 drive->name, rq_data_dir(pc->rq)
96 pc->flags |= PC_FLAG_DMA_ERROR;
98 pc->xferred = pc->req_xfer;
100 update_buffers(drive, pc);
102 debug_log("%s: DMA finished\n", drive->name);
105 /* No more interrupts */
106 if ((stat & ATA_DRQ) == 0) {
107 debug_log("Packet command completed, %d bytes transferred\n",
110 pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
112 local_irq_enable_in_hardirq();
114 if (drive->media == ide_tape && !scsi &&
115 (stat & ATA_ERR) && rq->cmd[0] == REQUEST_SENSE)
118 if ((stat & ATA_ERR) || (pc->flags & PC_FLAG_DMA_ERROR)) {
120 debug_log("%s: I/O error\n", drive->name);
122 if (drive->media != ide_tape || scsi) {
128 if (rq->cmd[0] == REQUEST_SENSE) {
129 printk(KERN_ERR "%s: I/O error in request sense"
130 " command\n", drive->name);
131 return ide_do_reset(drive);
134 debug_log("[cmd %x]: check condition\n", rq->cmd[0]);
136 /* Retry operation */
139 /* queued, but not started */
144 if ((pc->flags & PC_FLAG_WAIT_FOR_DSC) &&
145 (stat & ATA_DSC) == 0) {
150 /* Command finished - Call the callback function */
151 drive->pc_callback(drive);
156 if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
157 pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
158 printk(KERN_ERR "%s: The device wants to issue more interrupts "
159 "in DMA mode\n", drive->name);
161 return ide_do_reset(drive);
164 /* Get the number of bytes to transfer on this interrupt. */
165 ide_read_bcount_and_ireason(drive, &bcount, &ireason);
167 if (ireason & ATAPI_COD) {
168 printk(KERN_ERR "%s: CoD != 0 in %s\n", drive->name, __func__);
169 return ide_do_reset(drive);
172 if (((ireason & ATAPI_IO) == ATAPI_IO) ==
173 !!(pc->flags & PC_FLAG_WRITING)) {
174 /* Hopefully, we will never get here */
175 printk(KERN_ERR "%s: We wanted to %s, but the device wants us "
176 "to %s!\n", drive->name,
177 (ireason & ATAPI_IO) ? "Write" : "Read",
178 (ireason & ATAPI_IO) ? "Read" : "Write");
179 return ide_do_reset(drive);
182 if (!(pc->flags & PC_FLAG_WRITING)) {
183 /* Reading - Check that we have enough space */
184 temp = pc->xferred + bcount;
185 if (temp > pc->req_xfer) {
186 if (temp > pc->buf_size) {
187 printk(KERN_ERR "%s: The device wants to send "
188 "us more data than expected - "
192 temp = pc->buf_size - pc->xferred;
197 io_buffers(drive, pc, temp, 0);
199 tp_ops->input_data(drive, NULL,
201 printk(KERN_ERR "%s: transferred %d of "
208 ide_pad_transfer(drive, 0, bcount - temp);
209 ide_set_handler(drive, handler, timeout,
213 debug_log("The device wants to send us more data than "
214 "expected - allowing transfer\n");
216 xferfunc = tp_ops->input_data;
218 xferfunc = tp_ops->output_data;
220 if ((drive->media == ide_floppy && !scsi && !pc->buf) ||
221 (drive->media == ide_tape && !scsi && pc->bh) ||
223 io_buffers(drive, pc, bcount, !!(pc->flags & PC_FLAG_WRITING));
225 xferfunc(drive, NULL, pc->cur_pos, bcount);
227 /* Update the current position */
228 pc->xferred += bcount;
229 pc->cur_pos += bcount;
231 debug_log("[cmd %x] transferred %d bytes on that intr.\n",
234 /* And set the interrupt handler again */
235 ide_set_handler(drive, handler, timeout, expiry);
238 EXPORT_SYMBOL_GPL(ide_pc_intr);
240 static u8 ide_read_ireason(ide_drive_t *drive)
244 memset(&task, 0, sizeof(task));
245 task.tf_flags = IDE_TFLAG_IN_NSECT;
247 drive->hwif->tp_ops->tf_read(drive, &task);
249 return task.tf.nsect & 3;
252 static u8 ide_wait_ireason(ide_drive_t *drive, u8 ireason)
256 while (retries-- && ((ireason & ATAPI_COD) == 0 ||
257 (ireason & ATAPI_IO))) {
258 printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing "
259 "a packet command, retrying\n", drive->name);
261 ireason = ide_read_ireason(drive);
263 printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing "
264 "a packet command, ignoring\n",
266 ireason |= ATAPI_COD;
267 ireason &= ~ATAPI_IO;
274 ide_startstop_t ide_transfer_pc(ide_drive_t *drive, struct ide_atapi_pc *pc,
275 ide_handler_t *handler, unsigned int timeout,
276 ide_expiry_t *expiry)
278 ide_hwif_t *hwif = drive->hwif;
279 struct request *rq = hwif->hwgroup->rq;
280 ide_startstop_t startstop;
283 if (ide_wait_stat(&startstop, drive, ATA_DRQ, ATA_BUSY, WAIT_READY)) {
284 printk(KERN_ERR "%s: Strange, packet command initiated yet "
285 "DRQ isn't asserted\n", drive->name);
289 ireason = ide_read_ireason(drive);
290 if (drive->media == ide_tape && !drive->scsi)
291 ireason = ide_wait_ireason(drive, ireason);
293 if ((ireason & ATAPI_COD) == 0 || (ireason & ATAPI_IO)) {
294 printk(KERN_ERR "%s: (IO,CoD) != (0,1) while issuing "
295 "a packet command\n", drive->name);
296 return ide_do_reset(drive);
299 /* Set the interrupt routine */
300 ide_set_handler(drive, handler, timeout, expiry);
302 /* Begin DMA, if necessary */
303 if (pc->flags & PC_FLAG_DMA_OK) {
304 pc->flags |= PC_FLAG_DMA_IN_PROGRESS;
305 hwif->dma_ops->dma_start(drive);
308 /* Send the actual packet */
309 if ((drive->atapi_flags & IDE_AFLAG_ZIP_DRIVE) == 0)
310 hwif->tp_ops->output_data(drive, NULL, rq->cmd, 12);
314 EXPORT_SYMBOL_GPL(ide_transfer_pc);
316 ide_startstop_t ide_issue_pc(ide_drive_t *drive, struct ide_atapi_pc *pc,
317 ide_handler_t *handler, unsigned int timeout,
318 ide_expiry_t *expiry)
320 ide_hwif_t *hwif = drive->hwif;
324 /* We haven't transferred any data yet */
326 pc->cur_pos = pc->buf;
328 /* Request to transfer the entire buffer at once */
329 if (drive->media == ide_tape && !drive->scsi)
330 bcount = pc->req_xfer;
332 bcount = min(pc->req_xfer, 63 * 1024);
334 if (pc->flags & PC_FLAG_DMA_ERROR) {
335 pc->flags &= ~PC_FLAG_DMA_ERROR;
339 if ((pc->flags & PC_FLAG_DMA_OK) && drive->using_dma) {
342 dma = !hwif->dma_ops->dma_setup(drive);
348 pc->flags &= ~PC_FLAG_DMA_OK;
350 ide_pktcmd_tf_load(drive, drive->scsi ? 0 : IDE_TFLAG_OUT_DEVICE,
353 /* Issue the packet command */
354 if (drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT) {
355 ide_execute_command(drive, ATA_CMD_PACKET, handler,
359 ide_execute_pkt_cmd(drive);
360 return (*handler)(drive);
363 EXPORT_SYMBOL_GPL(ide_issue_pc);