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 xfer_func_t *xferfunc;
28 u8 stat, ireason, scsi = drive->scsi;
30 debug_log("Enter %s - interrupt handler\n", __func__);
32 if (pc->flags & PC_FLAG_TIMEDOUT) {
37 /* Clear the interrupt */
38 stat = hwif->read_status(hwif);
40 if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
41 if (hwif->dma_ops->dma_end(drive) ||
42 (drive->media == ide_tape && !scsi && (stat & ERR_STAT))) {
43 if (drive->media == ide_floppy && !scsi)
44 printk(KERN_ERR "%s: DMA %s error\n",
45 drive->name, rq_data_dir(pc->rq)
47 pc->flags |= PC_FLAG_DMA_ERROR;
49 pc->xferred = pc->req_xfer;
51 update_buffers(drive, pc);
53 debug_log("%s: DMA finished\n", drive->name);
56 /* No more interrupts */
57 if ((stat & DRQ_STAT) == 0) {
58 debug_log("Packet command completed, %d bytes transferred\n",
61 pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
63 local_irq_enable_in_hardirq();
65 if (drive->media == ide_tape && !scsi &&
66 (stat & ERR_STAT) && pc->c[0] == REQUEST_SENSE)
68 if ((stat & ERR_STAT) || (pc->flags & PC_FLAG_DMA_ERROR)) {
70 debug_log("%s: I/O error\n", drive->name);
72 if (drive->media != ide_tape || scsi) {
78 if (pc->c[0] == REQUEST_SENSE) {
79 printk(KERN_ERR "%s: I/O error in request sense"
80 " command\n", drive->name);
81 return ide_do_reset(drive);
84 debug_log("[cmd %x]: check condition\n", pc->c[0]);
88 /* queued, but not started */
93 if ((pc->flags & PC_FLAG_WAIT_FOR_DSC) &&
94 (stat & SEEK_STAT) == 0) {
98 /* Command finished - Call the callback function */
103 if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
104 pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
105 printk(KERN_ERR "%s: The device wants to issue more interrupts "
106 "in DMA mode\n", drive->name);
108 return ide_do_reset(drive);
111 /* Get the number of bytes to transfer on this interrupt. */
112 ide_read_bcount_and_ireason(drive, &bcount, &ireason);
115 printk(KERN_ERR "%s: CoD != 0 in %s\n", drive->name, __func__);
116 return ide_do_reset(drive);
118 if (((ireason & IO) == IO) == !!(pc->flags & PC_FLAG_WRITING)) {
119 /* Hopefully, we will never get here */
120 printk(KERN_ERR "%s: We wanted to %s, but the device wants us "
121 "to %s!\n", drive->name,
122 (ireason & IO) ? "Write" : "Read",
123 (ireason & IO) ? "Read" : "Write");
124 return ide_do_reset(drive);
126 if (!(pc->flags & PC_FLAG_WRITING)) {
127 /* Reading - Check that we have enough space */
128 temp = pc->xferred + bcount;
129 if (temp > pc->req_xfer) {
130 if (temp > pc->buf_size) {
131 printk(KERN_ERR "%s: The device wants to send "
132 "us more data than expected - "
136 temp = pc->buf_size - pc->xferred;
141 io_buffers(drive, pc, temp, 0);
143 hwif->input_data(drive, NULL,
145 printk(KERN_ERR "%s: transferred %d of "
152 ide_pad_transfer(drive, 0, bcount - temp);
153 ide_set_handler(drive, handler, timeout,
157 debug_log("The device wants to send us more data than "
158 "expected - allowing transfer\n");
160 xferfunc = hwif->input_data;
162 xferfunc = hwif->output_data;
164 if ((drive->media == ide_floppy && !scsi && !pc->buf) ||
165 (drive->media == ide_tape && !scsi && pc->bh) ||
167 io_buffers(drive, pc, bcount, !!(pc->flags & PC_FLAG_WRITING));
169 xferfunc(drive, NULL, pc->cur_pos, bcount);
171 /* Update the current position */
172 pc->xferred += bcount;
173 pc->cur_pos += bcount;
175 debug_log("[cmd %x] transferred %d bytes on that intr.\n",
178 /* And set the interrupt handler again */
179 ide_set_handler(drive, handler, timeout, expiry);
182 EXPORT_SYMBOL_GPL(ide_pc_intr);
184 static u8 ide_read_ireason(ide_drive_t *drive)
188 memset(&task, 0, sizeof(task));
189 task.tf_flags = IDE_TFLAG_IN_NSECT;
191 drive->hwif->tf_read(drive, &task);
193 return task.tf.nsect & 3;
196 static u8 ide_wait_ireason(ide_drive_t *drive, u8 ireason)
200 while (retries-- && ((ireason & CD) == 0 || (ireason & IO))) {
201 printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing "
202 "a packet command, retrying\n", drive->name);
204 ireason = ide_read_ireason(drive);
206 printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing "
207 "a packet command, ignoring\n",
217 ide_startstop_t ide_transfer_pc(ide_drive_t *drive, struct ide_atapi_pc *pc,
218 ide_handler_t *handler, unsigned int timeout,
219 ide_expiry_t *expiry)
221 ide_hwif_t *hwif = drive->hwif;
222 ide_startstop_t startstop;
225 if (ide_wait_stat(&startstop, drive, DRQ_STAT, BUSY_STAT, WAIT_READY)) {
226 printk(KERN_ERR "%s: Strange, packet command initiated yet "
227 "DRQ isn't asserted\n", drive->name);
231 ireason = ide_read_ireason(drive);
232 if (drive->media == ide_tape && !drive->scsi)
233 ireason = ide_wait_ireason(drive, ireason);
235 if ((ireason & CD) == 0 || (ireason & IO)) {
236 printk(KERN_ERR "%s: (IO,CoD) != (0,1) while issuing "
237 "a packet command\n", drive->name);
238 return ide_do_reset(drive);
241 /* Set the interrupt routine */
242 ide_set_handler(drive, handler, timeout, expiry);
244 /* Begin DMA, if necessary */
245 if (pc->flags & PC_FLAG_DMA_OK) {
246 pc->flags |= PC_FLAG_DMA_IN_PROGRESS;
247 hwif->dma_ops->dma_start(drive);
250 /* Send the actual packet */
251 if ((pc->flags & PC_FLAG_ZIP_DRIVE) == 0)
252 hwif->output_data(drive, NULL, pc->c, 12);
256 EXPORT_SYMBOL_GPL(ide_transfer_pc);
258 ide_startstop_t ide_issue_pc(ide_drive_t *drive, struct ide_atapi_pc *pc,
259 ide_handler_t *handler, unsigned int timeout,
260 ide_expiry_t *expiry)
262 ide_hwif_t *hwif = drive->hwif;
266 /* We haven't transferred any data yet */
268 pc->cur_pos = pc->buf;
270 /* Request to transfer the entire buffer at once */
271 if (drive->media == ide_tape && !drive->scsi)
272 bcount = pc->req_xfer;
274 bcount = min(pc->req_xfer, 63 * 1024);
276 if (pc->flags & PC_FLAG_DMA_ERROR) {
277 pc->flags &= ~PC_FLAG_DMA_ERROR;
281 if ((pc->flags & PC_FLAG_DMA_OK) && drive->using_dma) {
284 dma = !hwif->dma_ops->dma_setup(drive);
290 pc->flags &= ~PC_FLAG_DMA_OK;
292 ide_pktcmd_tf_load(drive, drive->scsi ? 0 : IDE_TFLAG_OUT_DEVICE,
295 /* Issue the packet command */
296 if (pc->flags & PC_FLAG_DRQ_INTERRUPT) {
297 ide_execute_command(drive, WIN_PACKETCMD, handler,
301 ide_execute_pkt_cmd(drive);
302 return (*handler)(drive);
305 EXPORT_SYMBOL_GPL(ide_issue_pc);