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)
17 /* TODO: unify the code thus making some arguments go away */
18 ide_startstop_t ide_pc_intr(ide_drive_t *drive, struct ide_atapi_pc *pc,
19 ide_handler_t *handler, unsigned int timeout, ide_expiry_t *expiry,
20 void (*update_buffers)(ide_drive_t *, struct ide_atapi_pc *),
21 void (*retry_pc)(ide_drive_t *), void (*dsc_handle)(ide_drive_t *),
22 void (*io_buffers)(ide_drive_t *, struct ide_atapi_pc *, unsigned, int))
24 ide_hwif_t *hwif = drive->hwif;
25 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
26 xfer_func_t *xferfunc;
29 u8 stat, ireason, scsi = drive->scsi;
31 debug_log("Enter %s - interrupt handler\n", __func__);
33 if (pc->flags & PC_FLAG_TIMEDOUT) {
34 if (drive->media == ide_floppy || drive->media == ide_tape)
35 drive->pc_callback(drive);
41 /* Clear the interrupt */
42 stat = tp_ops->read_status(hwif);
44 if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
45 if (hwif->dma_ops->dma_end(drive) ||
46 (drive->media == ide_tape && !scsi && (stat & ERR_STAT))) {
47 if (drive->media == ide_floppy && !scsi)
48 printk(KERN_ERR "%s: DMA %s error\n",
49 drive->name, rq_data_dir(pc->rq)
51 pc->flags |= PC_FLAG_DMA_ERROR;
53 pc->xferred = pc->req_xfer;
55 update_buffers(drive, pc);
57 debug_log("%s: DMA finished\n", drive->name);
60 /* No more interrupts */
61 if ((stat & DRQ_STAT) == 0) {
62 debug_log("Packet command completed, %d bytes transferred\n",
65 pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
67 local_irq_enable_in_hardirq();
69 if (drive->media == ide_tape && !scsi &&
70 (stat & ERR_STAT) && pc->c[0] == REQUEST_SENSE)
72 if ((stat & ERR_STAT) || (pc->flags & PC_FLAG_DMA_ERROR)) {
74 debug_log("%s: I/O error\n", drive->name);
76 if (drive->media != ide_tape || scsi) {
82 if (pc->c[0] == REQUEST_SENSE) {
83 printk(KERN_ERR "%s: I/O error in request sense"
84 " command\n", drive->name);
85 return ide_do_reset(drive);
88 debug_log("[cmd %x]: check condition\n", pc->c[0]);
92 /* queued, but not started */
97 if ((pc->flags & PC_FLAG_WAIT_FOR_DSC) &&
98 (stat & SEEK_STAT) == 0) {
102 /* Command finished - Call the callback function */
103 if (drive->media == ide_floppy || drive->media == ide_tape)
104 drive->pc_callback(drive);
110 if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
111 pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
112 printk(KERN_ERR "%s: The device wants to issue more interrupts "
113 "in DMA mode\n", drive->name);
115 return ide_do_reset(drive);
118 /* Get the number of bytes to transfer on this interrupt. */
119 ide_read_bcount_and_ireason(drive, &bcount, &ireason);
122 printk(KERN_ERR "%s: CoD != 0 in %s\n", drive->name, __func__);
123 return ide_do_reset(drive);
125 if (((ireason & IO) == IO) == !!(pc->flags & PC_FLAG_WRITING)) {
126 /* Hopefully, we will never get here */
127 printk(KERN_ERR "%s: We wanted to %s, but the device wants us "
128 "to %s!\n", drive->name,
129 (ireason & IO) ? "Write" : "Read",
130 (ireason & IO) ? "Read" : "Write");
131 return ide_do_reset(drive);
133 if (!(pc->flags & PC_FLAG_WRITING)) {
134 /* Reading - Check that we have enough space */
135 temp = pc->xferred + bcount;
136 if (temp > pc->req_xfer) {
137 if (temp > pc->buf_size) {
138 printk(KERN_ERR "%s: The device wants to send "
139 "us more data than expected - "
143 temp = pc->buf_size - pc->xferred;
148 io_buffers(drive, pc, temp, 0);
150 tp_ops->input_data(drive, NULL,
152 printk(KERN_ERR "%s: transferred %d of "
159 ide_pad_transfer(drive, 0, bcount - temp);
160 ide_set_handler(drive, handler, timeout,
164 debug_log("The device wants to send us more data than "
165 "expected - allowing transfer\n");
167 xferfunc = tp_ops->input_data;
169 xferfunc = tp_ops->output_data;
171 if ((drive->media == ide_floppy && !scsi && !pc->buf) ||
172 (drive->media == ide_tape && !scsi && pc->bh) ||
174 io_buffers(drive, pc, bcount, !!(pc->flags & PC_FLAG_WRITING));
176 xferfunc(drive, NULL, pc->cur_pos, bcount);
178 /* Update the current position */
179 pc->xferred += bcount;
180 pc->cur_pos += bcount;
182 debug_log("[cmd %x] transferred %d bytes on that intr.\n",
185 /* And set the interrupt handler again */
186 ide_set_handler(drive, handler, timeout, expiry);
189 EXPORT_SYMBOL_GPL(ide_pc_intr);
191 static u8 ide_read_ireason(ide_drive_t *drive)
195 memset(&task, 0, sizeof(task));
196 task.tf_flags = IDE_TFLAG_IN_NSECT;
198 drive->hwif->tp_ops->tf_read(drive, &task);
200 return task.tf.nsect & 3;
203 static u8 ide_wait_ireason(ide_drive_t *drive, u8 ireason)
207 while (retries-- && ((ireason & CD) == 0 || (ireason & IO))) {
208 printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing "
209 "a packet command, retrying\n", drive->name);
211 ireason = ide_read_ireason(drive);
213 printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing "
214 "a packet command, ignoring\n",
224 ide_startstop_t ide_transfer_pc(ide_drive_t *drive, struct ide_atapi_pc *pc,
225 ide_handler_t *handler, unsigned int timeout,
226 ide_expiry_t *expiry)
228 ide_hwif_t *hwif = drive->hwif;
229 ide_startstop_t startstop;
232 if (ide_wait_stat(&startstop, drive, DRQ_STAT, BUSY_STAT, WAIT_READY)) {
233 printk(KERN_ERR "%s: Strange, packet command initiated yet "
234 "DRQ isn't asserted\n", drive->name);
238 ireason = ide_read_ireason(drive);
239 if (drive->media == ide_tape && !drive->scsi)
240 ireason = ide_wait_ireason(drive, ireason);
242 if ((ireason & CD) == 0 || (ireason & IO)) {
243 printk(KERN_ERR "%s: (IO,CoD) != (0,1) while issuing "
244 "a packet command\n", drive->name);
245 return ide_do_reset(drive);
248 /* Set the interrupt routine */
249 ide_set_handler(drive, handler, timeout, expiry);
251 /* Begin DMA, if necessary */
252 if (pc->flags & PC_FLAG_DMA_OK) {
253 pc->flags |= PC_FLAG_DMA_IN_PROGRESS;
254 hwif->dma_ops->dma_start(drive);
257 /* Send the actual packet */
258 if ((pc->flags & PC_FLAG_ZIP_DRIVE) == 0)
259 hwif->tp_ops->output_data(drive, NULL, pc->c, 12);
263 EXPORT_SYMBOL_GPL(ide_transfer_pc);
265 ide_startstop_t ide_issue_pc(ide_drive_t *drive, struct ide_atapi_pc *pc,
266 ide_handler_t *handler, unsigned int timeout,
267 ide_expiry_t *expiry)
269 ide_hwif_t *hwif = drive->hwif;
273 /* We haven't transferred any data yet */
275 pc->cur_pos = pc->buf;
277 /* Request to transfer the entire buffer at once */
278 if (drive->media == ide_tape && !drive->scsi)
279 bcount = pc->req_xfer;
281 bcount = min(pc->req_xfer, 63 * 1024);
283 if (pc->flags & PC_FLAG_DMA_ERROR) {
284 pc->flags &= ~PC_FLAG_DMA_ERROR;
288 if ((pc->flags & PC_FLAG_DMA_OK) && drive->using_dma) {
291 dma = !hwif->dma_ops->dma_setup(drive);
297 pc->flags &= ~PC_FLAG_DMA_OK;
299 ide_pktcmd_tf_load(drive, drive->scsi ? 0 : IDE_TFLAG_OUT_DEVICE,
302 /* Issue the packet command */
303 if (pc->flags & PC_FLAG_DRQ_INTERRUPT) {
304 ide_execute_command(drive, WIN_PACKETCMD, handler,
308 ide_execute_pkt_cmd(drive);
309 return (*handler)(drive);
312 EXPORT_SYMBOL_GPL(ide_issue_pc);