Commit | Line | Data |
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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; | |
25 | xfer_func_t *xferfunc; | |
26 | unsigned int temp; | |
27 | u16 bcount; | |
28 | u8 stat, ireason, scsi = drive->scsi; | |
29 | ||
30 | debug_log("Enter %s - interrupt handler\n", __func__); | |
31 | ||
32 | if (pc->flags & PC_FLAG_TIMEDOUT) { | |
33 | pc->callback(drive); | |
34 | return ide_stopped; | |
35 | } | |
36 | ||
37 | /* Clear the interrupt */ | |
b73c7ee2 | 38 | stat = hwif->read_status(hwif); |
646c0cb6 BZ |
39 | |
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) | |
46 | ? "write" : "read"); | |
47 | pc->flags |= PC_FLAG_DMA_ERROR; | |
48 | } else { | |
49 | pc->xferred = pc->req_xfer; | |
50 | if (update_buffers) | |
51 | update_buffers(drive, pc); | |
52 | } | |
53 | debug_log("%s: DMA finished\n", drive->name); | |
54 | } | |
55 | ||
56 | /* No more interrupts */ | |
57 | if ((stat & DRQ_STAT) == 0) { | |
58 | debug_log("Packet command completed, %d bytes transferred\n", | |
59 | pc->xferred); | |
60 | ||
61 | pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS; | |
62 | ||
63 | local_irq_enable_in_hardirq(); | |
64 | ||
65 | if (drive->media == ide_tape && !scsi && | |
66 | (stat & ERR_STAT) && pc->c[0] == REQUEST_SENSE) | |
67 | stat &= ~ERR_STAT; | |
68 | if ((stat & ERR_STAT) || (pc->flags & PC_FLAG_DMA_ERROR)) { | |
69 | /* Error detected */ | |
70 | debug_log("%s: I/O error\n", drive->name); | |
71 | ||
72 | if (drive->media != ide_tape || scsi) { | |
73 | pc->rq->errors++; | |
74 | if (scsi) | |
75 | goto cmd_finished; | |
76 | } | |
77 | ||
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); | |
82 | } | |
83 | ||
84 | debug_log("[cmd %x]: check condition\n", pc->c[0]); | |
85 | ||
86 | /* Retry operation */ | |
87 | retry_pc(drive); | |
88 | /* queued, but not started */ | |
89 | return ide_stopped; | |
90 | } | |
91 | cmd_finished: | |
92 | pc->error = 0; | |
93 | if ((pc->flags & PC_FLAG_WAIT_FOR_DSC) && | |
94 | (stat & SEEK_STAT) == 0) { | |
95 | dsc_handle(drive); | |
96 | return ide_stopped; | |
97 | } | |
98 | /* Command finished - Call the callback function */ | |
99 | pc->callback(drive); | |
100 | return ide_stopped; | |
101 | } | |
102 | ||
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); | |
107 | ide_dma_off(drive); | |
108 | return ide_do_reset(drive); | |
109 | } | |
110 | /* Get the number of bytes to transfer on this interrupt. */ | |
111 | bcount = (hwif->INB(hwif->io_ports.lbah_addr) << 8) | | |
112 | hwif->INB(hwif->io_ports.lbam_addr); | |
113 | ||
114 | ireason = hwif->INB(hwif->io_ports.nsect_addr); | |
115 | ||
116 | if (ireason & CD) { | |
117 | printk(KERN_ERR "%s: CoD != 0 in %s\n", drive->name, __func__); | |
118 | return ide_do_reset(drive); | |
119 | } | |
120 | if (((ireason & IO) == IO) == !!(pc->flags & PC_FLAG_WRITING)) { | |
121 | /* Hopefully, we will never get here */ | |
122 | printk(KERN_ERR "%s: We wanted to %s, but the device wants us " | |
123 | "to %s!\n", drive->name, | |
124 | (ireason & IO) ? "Write" : "Read", | |
125 | (ireason & IO) ? "Read" : "Write"); | |
126 | return ide_do_reset(drive); | |
127 | } | |
128 | if (!(pc->flags & PC_FLAG_WRITING)) { | |
129 | /* Reading - Check that we have enough space */ | |
130 | temp = pc->xferred + bcount; | |
131 | if (temp > pc->req_xfer) { | |
132 | if (temp > pc->buf_size) { | |
133 | printk(KERN_ERR "%s: The device wants to send " | |
134 | "us more data than expected - " | |
135 | "discarding data\n", | |
136 | drive->name); | |
137 | if (scsi) | |
138 | temp = pc->buf_size - pc->xferred; | |
139 | else | |
140 | temp = 0; | |
141 | if (temp) { | |
142 | if (pc->sg) | |
143 | io_buffers(drive, pc, temp, 0); | |
144 | else | |
145 | hwif->input_data(drive, NULL, | |
146 | pc->cur_pos, temp); | |
147 | printk(KERN_ERR "%s: transferred %d of " | |
148 | "%d bytes\n", | |
149 | drive->name, | |
150 | temp, bcount); | |
151 | } | |
152 | pc->xferred += temp; | |
153 | pc->cur_pos += temp; | |
154 | ide_pad_transfer(drive, 0, bcount - temp); | |
155 | ide_set_handler(drive, handler, timeout, | |
156 | expiry); | |
157 | return ide_started; | |
158 | } | |
159 | debug_log("The device wants to send us more data than " | |
160 | "expected - allowing transfer\n"); | |
161 | } | |
162 | xferfunc = hwif->input_data; | |
163 | } else | |
164 | xferfunc = hwif->output_data; | |
165 | ||
166 | if ((drive->media == ide_floppy && !scsi && !pc->buf) || | |
167 | (drive->media == ide_tape && !scsi && pc->bh) || | |
168 | (scsi && pc->sg)) | |
169 | io_buffers(drive, pc, bcount, !!(pc->flags & PC_FLAG_WRITING)); | |
170 | else | |
171 | xferfunc(drive, NULL, pc->cur_pos, bcount); | |
172 | ||
173 | /* Update the current position */ | |
174 | pc->xferred += bcount; | |
175 | pc->cur_pos += bcount; | |
176 | ||
177 | debug_log("[cmd %x] transferred %d bytes on that intr.\n", | |
178 | pc->c[0], bcount); | |
179 | ||
180 | /* And set the interrupt handler again */ | |
181 | ide_set_handler(drive, handler, timeout, expiry); | |
182 | return ide_started; | |
183 | } | |
184 | EXPORT_SYMBOL_GPL(ide_pc_intr); | |
594c16d8 BZ |
185 | |
186 | static u8 ide_wait_ireason(ide_drive_t *drive, u8 ireason) | |
187 | { | |
188 | ide_hwif_t *hwif = drive->hwif; | |
189 | int retries = 100; | |
190 | ||
191 | while (retries-- && ((ireason & CD) == 0 || (ireason & IO))) { | |
192 | printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing " | |
193 | "a packet command, retrying\n", drive->name); | |
194 | udelay(100); | |
195 | ireason = hwif->INB(hwif->io_ports.nsect_addr); | |
196 | if (retries == 0) { | |
197 | printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing " | |
198 | "a packet command, ignoring\n", | |
199 | drive->name); | |
200 | ireason |= CD; | |
201 | ireason &= ~IO; | |
202 | } | |
203 | } | |
204 | ||
205 | return ireason; | |
206 | } | |
207 | ||
208 | ide_startstop_t ide_transfer_pc(ide_drive_t *drive, struct ide_atapi_pc *pc, | |
209 | ide_handler_t *handler, unsigned int timeout, | |
210 | ide_expiry_t *expiry) | |
211 | { | |
212 | ide_hwif_t *hwif = drive->hwif; | |
213 | ide_startstop_t startstop; | |
214 | u8 ireason; | |
215 | ||
216 | if (ide_wait_stat(&startstop, drive, DRQ_STAT, BUSY_STAT, WAIT_READY)) { | |
217 | printk(KERN_ERR "%s: Strange, packet command initiated yet " | |
218 | "DRQ isn't asserted\n", drive->name); | |
219 | return startstop; | |
220 | } | |
221 | ||
222 | ireason = hwif->INB(hwif->io_ports.nsect_addr); | |
223 | if (drive->media == ide_tape && !drive->scsi) | |
224 | ireason = ide_wait_ireason(drive, ireason); | |
225 | ||
226 | if ((ireason & CD) == 0 || (ireason & IO)) { | |
227 | printk(KERN_ERR "%s: (IO,CoD) != (0,1) while issuing " | |
228 | "a packet command\n", drive->name); | |
229 | return ide_do_reset(drive); | |
230 | } | |
231 | ||
232 | /* Set the interrupt routine */ | |
233 | ide_set_handler(drive, handler, timeout, expiry); | |
234 | ||
235 | /* Begin DMA, if necessary */ | |
236 | if (pc->flags & PC_FLAG_DMA_OK) { | |
237 | pc->flags |= PC_FLAG_DMA_IN_PROGRESS; | |
238 | hwif->dma_ops->dma_start(drive); | |
239 | } | |
240 | ||
241 | /* Send the actual packet */ | |
242 | if ((pc->flags & PC_FLAG_ZIP_DRIVE) == 0) | |
243 | hwif->output_data(drive, NULL, pc->c, 12); | |
244 | ||
245 | return ide_started; | |
246 | } | |
247 | EXPORT_SYMBOL_GPL(ide_transfer_pc); | |
6bf1641c BZ |
248 | |
249 | ide_startstop_t ide_issue_pc(ide_drive_t *drive, struct ide_atapi_pc *pc, | |
250 | ide_handler_t *handler, unsigned int timeout, | |
251 | ide_expiry_t *expiry) | |
252 | { | |
253 | ide_hwif_t *hwif = drive->hwif; | |
254 | u16 bcount; | |
255 | u8 dma = 0; | |
256 | ||
257 | /* We haven't transferred any data yet */ | |
258 | pc->xferred = 0; | |
259 | pc->cur_pos = pc->buf; | |
260 | ||
261 | /* Request to transfer the entire buffer at once */ | |
262 | if (drive->media == ide_tape && !drive->scsi) | |
263 | bcount = pc->req_xfer; | |
264 | else | |
265 | bcount = min(pc->req_xfer, 63 * 1024); | |
266 | ||
267 | if (pc->flags & PC_FLAG_DMA_ERROR) { | |
268 | pc->flags &= ~PC_FLAG_DMA_ERROR; | |
269 | ide_dma_off(drive); | |
270 | } | |
271 | ||
272 | if ((pc->flags & PC_FLAG_DMA_OK) && drive->using_dma) { | |
273 | if (drive->scsi) | |
274 | hwif->sg_mapped = 1; | |
275 | dma = !hwif->dma_ops->dma_setup(drive); | |
276 | if (drive->scsi) | |
277 | hwif->sg_mapped = 0; | |
278 | } | |
279 | ||
280 | if (!dma) | |
281 | pc->flags &= ~PC_FLAG_DMA_OK; | |
282 | ||
283 | ide_pktcmd_tf_load(drive, drive->scsi ? 0 : IDE_TFLAG_OUT_DEVICE, | |
284 | bcount, dma); | |
285 | ||
286 | /* Issue the packet command */ | |
287 | if (pc->flags & PC_FLAG_DRQ_INTERRUPT) { | |
288 | ide_execute_command(drive, WIN_PACKETCMD, handler, | |
289 | timeout, NULL); | |
290 | return ide_started; | |
291 | } else { | |
292 | ide_execute_pkt_cmd(drive); | |
293 | return (*handler)(drive); | |
294 | } | |
295 | } | |
296 | EXPORT_SYMBOL_GPL(ide_issue_pc); |