Commit | Line | Data |
---|---|---|
594c16d8 BZ |
1 | /* |
2 | * ATAPI support. | |
3 | */ | |
4 | ||
5 | #include <linux/kernel.h> | |
6 | #include <linux/delay.h> | |
7 | #include <linux/ide.h> | |
646c0cb6 BZ |
8 | #include <scsi/scsi.h> |
9 | ||
10 | #ifdef DEBUG | |
11 | #define debug_log(fmt, args...) \ | |
12 | printk(KERN_INFO "ide: " fmt, ## args) | |
13 | #else | |
14 | #define debug_log(fmt, args...) do {} while (0) | |
15 | #endif | |
16 | ||
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)) | |
23 | { | |
24 | ide_hwif_t *hwif = drive->hwif; | |
8fccf899 | 25 | struct request *rq = hwif->hwgroup->rq; |
374e042c | 26 | const struct ide_tp_ops *tp_ops = hwif->tp_ops; |
646c0cb6 BZ |
27 | xfer_func_t *xferfunc; |
28 | unsigned int temp; | |
29 | u16 bcount; | |
30 | u8 stat, ireason, scsi = drive->scsi; | |
31 | ||
32 | debug_log("Enter %s - interrupt handler\n", __func__); | |
33 | ||
34 | if (pc->flags & PC_FLAG_TIMEDOUT) { | |
db9d2869 | 35 | drive->pc_callback(drive); |
646c0cb6 BZ |
36 | return ide_stopped; |
37 | } | |
38 | ||
39 | /* Clear the interrupt */ | |
374e042c | 40 | stat = tp_ops->read_status(hwif); |
646c0cb6 BZ |
41 | |
42 | if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) { | |
43 | if (hwif->dma_ops->dma_end(drive) || | |
44 | (drive->media == ide_tape && !scsi && (stat & ERR_STAT))) { | |
45 | if (drive->media == ide_floppy && !scsi) | |
46 | printk(KERN_ERR "%s: DMA %s error\n", | |
47 | drive->name, rq_data_dir(pc->rq) | |
48 | ? "write" : "read"); | |
49 | pc->flags |= PC_FLAG_DMA_ERROR; | |
50 | } else { | |
51 | pc->xferred = pc->req_xfer; | |
52 | if (update_buffers) | |
53 | update_buffers(drive, pc); | |
54 | } | |
55 | debug_log("%s: DMA finished\n", drive->name); | |
56 | } | |
57 | ||
58 | /* No more interrupts */ | |
59 | if ((stat & DRQ_STAT) == 0) { | |
60 | debug_log("Packet command completed, %d bytes transferred\n", | |
61 | pc->xferred); | |
62 | ||
63 | pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS; | |
64 | ||
65 | local_irq_enable_in_hardirq(); | |
66 | ||
67 | if (drive->media == ide_tape && !scsi && | |
8fccf899 | 68 | (stat & ERR_STAT) && rq->cmd[0] == REQUEST_SENSE) |
646c0cb6 | 69 | stat &= ~ERR_STAT; |
8fccf899 | 70 | |
646c0cb6 BZ |
71 | if ((stat & ERR_STAT) || (pc->flags & PC_FLAG_DMA_ERROR)) { |
72 | /* Error detected */ | |
73 | debug_log("%s: I/O error\n", drive->name); | |
74 | ||
75 | if (drive->media != ide_tape || scsi) { | |
76 | pc->rq->errors++; | |
77 | if (scsi) | |
78 | goto cmd_finished; | |
79 | } | |
80 | ||
8fccf899 | 81 | if (rq->cmd[0] == REQUEST_SENSE) { |
646c0cb6 BZ |
82 | printk(KERN_ERR "%s: I/O error in request sense" |
83 | " command\n", drive->name); | |
84 | return ide_do_reset(drive); | |
85 | } | |
86 | ||
8fccf899 | 87 | debug_log("[cmd %x]: check condition\n", rq->cmd[0]); |
646c0cb6 BZ |
88 | |
89 | /* Retry operation */ | |
90 | retry_pc(drive); | |
8fccf899 | 91 | |
646c0cb6 BZ |
92 | /* queued, but not started */ |
93 | return ide_stopped; | |
94 | } | |
95 | cmd_finished: | |
96 | pc->error = 0; | |
97 | if ((pc->flags & PC_FLAG_WAIT_FOR_DSC) && | |
98 | (stat & SEEK_STAT) == 0) { | |
99 | dsc_handle(drive); | |
100 | return ide_stopped; | |
101 | } | |
8fccf899 | 102 | |
646c0cb6 | 103 | /* Command finished - Call the callback function */ |
db9d2869 | 104 | drive->pc_callback(drive); |
8fccf899 | 105 | |
646c0cb6 BZ |
106 | return ide_stopped; |
107 | } | |
108 | ||
109 | if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) { | |
110 | pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS; | |
111 | printk(KERN_ERR "%s: The device wants to issue more interrupts " | |
112 | "in DMA mode\n", drive->name); | |
113 | ide_dma_off(drive); | |
114 | return ide_do_reset(drive); | |
115 | } | |
646c0cb6 | 116 | |
1823649b BZ |
117 | /* Get the number of bytes to transfer on this interrupt. */ |
118 | ide_read_bcount_and_ireason(drive, &bcount, &ireason); | |
646c0cb6 BZ |
119 | |
120 | if (ireason & CD) { | |
121 | printk(KERN_ERR "%s: CoD != 0 in %s\n", drive->name, __func__); | |
122 | return ide_do_reset(drive); | |
123 | } | |
8fccf899 | 124 | |
646c0cb6 BZ |
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); | |
132 | } | |
8fccf899 | 133 | |
646c0cb6 BZ |
134 | if (!(pc->flags & PC_FLAG_WRITING)) { |
135 | /* Reading - Check that we have enough space */ | |
136 | temp = pc->xferred + bcount; | |
137 | if (temp > pc->req_xfer) { | |
138 | if (temp > pc->buf_size) { | |
139 | printk(KERN_ERR "%s: The device wants to send " | |
140 | "us more data than expected - " | |
141 | "discarding data\n", | |
142 | drive->name); | |
143 | if (scsi) | |
144 | temp = pc->buf_size - pc->xferred; | |
145 | else | |
146 | temp = 0; | |
147 | if (temp) { | |
148 | if (pc->sg) | |
149 | io_buffers(drive, pc, temp, 0); | |
150 | else | |
374e042c | 151 | tp_ops->input_data(drive, NULL, |
646c0cb6 BZ |
152 | pc->cur_pos, temp); |
153 | printk(KERN_ERR "%s: transferred %d of " | |
154 | "%d bytes\n", | |
155 | drive->name, | |
156 | temp, bcount); | |
157 | } | |
158 | pc->xferred += temp; | |
159 | pc->cur_pos += temp; | |
160 | ide_pad_transfer(drive, 0, bcount - temp); | |
161 | ide_set_handler(drive, handler, timeout, | |
162 | expiry); | |
163 | return ide_started; | |
164 | } | |
165 | debug_log("The device wants to send us more data than " | |
166 | "expected - allowing transfer\n"); | |
167 | } | |
374e042c | 168 | xferfunc = tp_ops->input_data; |
646c0cb6 | 169 | } else |
374e042c | 170 | xferfunc = tp_ops->output_data; |
646c0cb6 BZ |
171 | |
172 | if ((drive->media == ide_floppy && !scsi && !pc->buf) || | |
173 | (drive->media == ide_tape && !scsi && pc->bh) || | |
174 | (scsi && pc->sg)) | |
175 | io_buffers(drive, pc, bcount, !!(pc->flags & PC_FLAG_WRITING)); | |
176 | else | |
177 | xferfunc(drive, NULL, pc->cur_pos, bcount); | |
178 | ||
179 | /* Update the current position */ | |
180 | pc->xferred += bcount; | |
181 | pc->cur_pos += bcount; | |
182 | ||
183 | debug_log("[cmd %x] transferred %d bytes on that intr.\n", | |
8fccf899 | 184 | rq->cmd[0], bcount); |
646c0cb6 BZ |
185 | |
186 | /* And set the interrupt handler again */ | |
187 | ide_set_handler(drive, handler, timeout, expiry); | |
188 | return ide_started; | |
189 | } | |
190 | EXPORT_SYMBOL_GPL(ide_pc_intr); | |
594c16d8 | 191 | |
88a72109 BZ |
192 | static u8 ide_read_ireason(ide_drive_t *drive) |
193 | { | |
194 | ide_task_t task; | |
195 | ||
196 | memset(&task, 0, sizeof(task)); | |
197 | task.tf_flags = IDE_TFLAG_IN_NSECT; | |
198 | ||
374e042c | 199 | drive->hwif->tp_ops->tf_read(drive, &task); |
88a72109 BZ |
200 | |
201 | return task.tf.nsect & 3; | |
202 | } | |
203 | ||
594c16d8 BZ |
204 | static u8 ide_wait_ireason(ide_drive_t *drive, u8 ireason) |
205 | { | |
594c16d8 BZ |
206 | int retries = 100; |
207 | ||
208 | while (retries-- && ((ireason & CD) == 0 || (ireason & IO))) { | |
209 | printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing " | |
210 | "a packet command, retrying\n", drive->name); | |
211 | udelay(100); | |
88a72109 | 212 | ireason = ide_read_ireason(drive); |
594c16d8 BZ |
213 | if (retries == 0) { |
214 | printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing " | |
215 | "a packet command, ignoring\n", | |
216 | drive->name); | |
217 | ireason |= CD; | |
218 | ireason &= ~IO; | |
219 | } | |
220 | } | |
221 | ||
222 | return ireason; | |
223 | } | |
224 | ||
225 | ide_startstop_t ide_transfer_pc(ide_drive_t *drive, struct ide_atapi_pc *pc, | |
226 | ide_handler_t *handler, unsigned int timeout, | |
227 | ide_expiry_t *expiry) | |
228 | { | |
229 | ide_hwif_t *hwif = drive->hwif; | |
8fccf899 | 230 | struct request *rq = hwif->hwgroup->rq; |
594c16d8 BZ |
231 | ide_startstop_t startstop; |
232 | u8 ireason; | |
233 | ||
234 | if (ide_wait_stat(&startstop, drive, DRQ_STAT, BUSY_STAT, WAIT_READY)) { | |
235 | printk(KERN_ERR "%s: Strange, packet command initiated yet " | |
236 | "DRQ isn't asserted\n", drive->name); | |
237 | return startstop; | |
238 | } | |
239 | ||
88a72109 | 240 | ireason = ide_read_ireason(drive); |
594c16d8 BZ |
241 | if (drive->media == ide_tape && !drive->scsi) |
242 | ireason = ide_wait_ireason(drive, ireason); | |
243 | ||
244 | if ((ireason & CD) == 0 || (ireason & IO)) { | |
245 | printk(KERN_ERR "%s: (IO,CoD) != (0,1) while issuing " | |
246 | "a packet command\n", drive->name); | |
247 | return ide_do_reset(drive); | |
248 | } | |
249 | ||
250 | /* Set the interrupt routine */ | |
251 | ide_set_handler(drive, handler, timeout, expiry); | |
252 | ||
253 | /* Begin DMA, if necessary */ | |
254 | if (pc->flags & PC_FLAG_DMA_OK) { | |
255 | pc->flags |= PC_FLAG_DMA_IN_PROGRESS; | |
256 | hwif->dma_ops->dma_start(drive); | |
257 | } | |
258 | ||
259 | /* Send the actual packet */ | |
ea68d270 | 260 | if ((drive->atapi_flags & IDE_AFLAG_ZIP_DRIVE) == 0) |
8fccf899 | 261 | hwif->tp_ops->output_data(drive, NULL, rq->cmd, 12); |
594c16d8 BZ |
262 | |
263 | return ide_started; | |
264 | } | |
265 | EXPORT_SYMBOL_GPL(ide_transfer_pc); | |
6bf1641c BZ |
266 | |
267 | ide_startstop_t ide_issue_pc(ide_drive_t *drive, struct ide_atapi_pc *pc, | |
268 | ide_handler_t *handler, unsigned int timeout, | |
269 | ide_expiry_t *expiry) | |
270 | { | |
271 | ide_hwif_t *hwif = drive->hwif; | |
272 | u16 bcount; | |
273 | u8 dma = 0; | |
274 | ||
275 | /* We haven't transferred any data yet */ | |
276 | pc->xferred = 0; | |
277 | pc->cur_pos = pc->buf; | |
278 | ||
279 | /* Request to transfer the entire buffer at once */ | |
280 | if (drive->media == ide_tape && !drive->scsi) | |
281 | bcount = pc->req_xfer; | |
282 | else | |
283 | bcount = min(pc->req_xfer, 63 * 1024); | |
284 | ||
285 | if (pc->flags & PC_FLAG_DMA_ERROR) { | |
286 | pc->flags &= ~PC_FLAG_DMA_ERROR; | |
287 | ide_dma_off(drive); | |
288 | } | |
289 | ||
290 | if ((pc->flags & PC_FLAG_DMA_OK) && drive->using_dma) { | |
291 | if (drive->scsi) | |
292 | hwif->sg_mapped = 1; | |
293 | dma = !hwif->dma_ops->dma_setup(drive); | |
294 | if (drive->scsi) | |
295 | hwif->sg_mapped = 0; | |
296 | } | |
297 | ||
298 | if (!dma) | |
299 | pc->flags &= ~PC_FLAG_DMA_OK; | |
300 | ||
301 | ide_pktcmd_tf_load(drive, drive->scsi ? 0 : IDE_TFLAG_OUT_DEVICE, | |
302 | bcount, dma); | |
303 | ||
304 | /* Issue the packet command */ | |
ac77ef8b | 305 | if (drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT) { |
6bf1641c BZ |
306 | ide_execute_command(drive, WIN_PACKETCMD, handler, |
307 | timeout, NULL); | |
308 | return ide_started; | |
309 | } else { | |
310 | ide_execute_pkt_cmd(drive); | |
311 | return (*handler)(drive); | |
312 | } | |
313 | } | |
314 | EXPORT_SYMBOL_GPL(ide_issue_pc); |