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[linux-2.6/linux-mips.git] / drivers / ide / ide-features.c
blob967b91e55c199fe8a34143a9f8d6134ed91d7e4e
1 /*
2 * linux/drivers/block/ide-features.c Version 0.04 June 9, 2000
3 *
4 * Copyright (C) 1999-2000 Linus Torvalds & authors (see below)
5 *
6 * Copyright (C) 1999-2000 Andre Hedrick <andre@linux-ide.org>
7 *
8 * Extracts if ide.c to address the evolving transfer rate code for
9 * the SETFEATURES_XFER callouts. Various parts of any given function
10 * are credited to previous ATA-IDE maintainers.
11 *
12 * Auto-CRC downgrade for Ultra DMA(ing)
13 *
14 * May be copied or modified under the terms of the GNU General Public License
15 */
16
17 #include <linux/config.h>
18 #define __NO_VERSION__
19 #include <linux/module.h>
20 #include <linux/types.h>
21 #include <linux/string.h>
22 #include <linux/kernel.h>
23 #include <linux/timer.h>
24 #include <linux/mm.h>
25 #include <linux/interrupt.h>
26 #include <linux/major.h>
27 #include <linux/errno.h>
28 #include <linux/genhd.h>
29 #include <linux/blkpg.h>
30 #include <linux/malloc.h>
31 #include <linux/pci.h>
32 #include <linux/delay.h>
33 #include <linux/hdreg.h>
34 #include <linux/ide.h>
35
36 #include <asm/byteorder.h>
37 #include <asm/irq.h>
38 #include <asm/uaccess.h>
39 #include <asm/io.h>
40 #include <asm/bitops.h>
41
42 #define SETFEATURES_CONTROL_REG (0) /* some arch's may need */
43
44 /*
45 * A Verbose noise maker for debugging on the attempted transfer rates.
46 */
47 char *ide_xfer_verbose (byte xfer_rate)
48 {
49 switch(xfer_rate) {
50 case XFER_UDMA_7: return("UDMA 7");
51 case XFER_UDMA_6: return("UDMA 6");
52 case XFER_UDMA_5: return("UDMA 5");
53 case XFER_UDMA_4: return("UDMA 4");
54 case XFER_UDMA_3: return("UDMA 3");
55 case XFER_UDMA_2: return("UDMA 2");
56 case XFER_UDMA_1: return("UDMA 1");
57 case XFER_UDMA_0: return("UDMA 0");
58 case XFER_MW_DMA_2: return("MW DMA 2");
59 case XFER_MW_DMA_1: return("MW DMA 1");
60 case XFER_MW_DMA_0: return("MW DMA 0");
61 case XFER_SW_DMA_2: return("SW DMA 2");
62 case XFER_SW_DMA_1: return("SW DMA 1");
63 case XFER_SW_DMA_0: return("SW DMA 0");
64 case XFER_PIO_4: return("PIO 4");
65 case XFER_PIO_3: return("PIO 3");
66 case XFER_PIO_2: return("PIO 2");
67 case XFER_PIO_1: return("PIO 1");
68 case XFER_PIO_0: return("PIO 0");
69 case XFER_PIO_SLOW: return("PIO SLOW");
70 default: return("XFER ERROR");
71 }
72 }
73
74 /*
75 *
76 */
77 char *ide_media_verbose (ide_drive_t *drive)
78 {
79 switch (drive->media) {
80 case ide_scsi: return("scsi ");
81 case ide_disk: return("disk ");
82 case ide_optical: return("optical");
83 case ide_cdrom: return("cdrom ");
84 case ide_tape: return("tape ");
85 case ide_floppy: return("floppy ");
86 default: return("???????");
87 }
88 }
89
90 /*
91 * A Verbose noise maker for debugging on the attempted dmaing calls.
92 */
93 char *ide_dmafunc_verbose (ide_dma_action_t dmafunc)
94 {
95 switch (dmafunc) {
96 case ide_dma_read: return("ide_dma_read");
97 case ide_dma_write: return("ide_dma_write");
98 case ide_dma_begin: return("ide_dma_begin");
99 case ide_dma_end: return("ide_dma_end:");
100 case ide_dma_check: return("ide_dma_check");
101 case ide_dma_on: return("ide_dma_on");
102 case ide_dma_off: return("ide_dma_off");
103 case ide_dma_off_quietly: return("ide_dma_off_quietly");
104 case ide_dma_test_irq: return("ide_dma_test_irq");
105 case ide_dma_bad_drive: return("ide_dma_bad_drive");
106 case ide_dma_good_drive: return("ide_dma_good_drive");
107 case ide_dma_verbose: return("ide_dma_verbose");
108 case ide_dma_retune: return("ide_dma_retune");
109 case ide_dma_lostirq: return("ide_dma_lostirq");
110 case ide_dma_timeout: return("ide_dma_timeout");
111 default: return("unknown");
112 }
113 }
114
115 /*
116 *
117 */
118 byte ide_auto_reduce_xfer (ide_drive_t *drive)
119 {
120 if (!drive->crc_count)
121 return drive->current_speed;
122 drive->crc_count = 0;
123
124 switch(drive->current_speed) {
125 case XFER_UDMA_7: return XFER_UDMA_6;
126 case XFER_UDMA_6: return XFER_UDMA_5;
127 case XFER_UDMA_5: return XFER_UDMA_4;
128 case XFER_UDMA_4: return XFER_UDMA_3;
129 case XFER_UDMA_3: return XFER_UDMA_2;
130 case XFER_UDMA_2: return XFER_UDMA_1;
131 case XFER_UDMA_1: return XFER_UDMA_0;
132 case XFER_UDMA_0:
133 if (drive->id->dma_mword & 0x0004) return XFER_MW_DMA_2;
134 else if (drive->id->dma_mword & 0x0002) return XFER_MW_DMA_1;
135 else if (drive->id->dma_mword & 0x0001) return XFER_MW_DMA_0;
136 else return XFER_PIO_4;
137 case XFER_MW_DMA_2: return XFER_MW_DMA_1;
138 case XFER_MW_DMA_1: return XFER_MW_DMA_0;
139 case XFER_MW_DMA_0:
140 if (drive->id->dma_1word & 0x0004) return XFER_SW_DMA_2;
141 else if (drive->id->dma_1word & 0x0002) return XFER_SW_DMA_1;
142 else if (drive->id->dma_1word & 0x0001) return XFER_SW_DMA_0;
143 else return XFER_PIO_4;
144 case XFER_SW_DMA_2: return XFER_SW_DMA_1;
145 case XFER_SW_DMA_1: return XFER_SW_DMA_0;
146 case XFER_SW_DMA_0:
147 {
148 return XFER_PIO_4;
149 }
150 case XFER_PIO_4: return XFER_PIO_3;
151 case XFER_PIO_3: return XFER_PIO_2;
152 case XFER_PIO_2: return XFER_PIO_1;
153 case XFER_PIO_1: return XFER_PIO_0;
154 case XFER_PIO_0:
155 default: return XFER_PIO_SLOW;
156 }
157 }
158
159 /*
160 * Update the
161 */
162 int ide_driveid_update (ide_drive_t *drive)
163 {
164 /*
165 * Re-read drive->id for possible DMA mode
166 * change (copied from ide-probe.c)
167 */
168 struct hd_driveid *id;
169 unsigned long timeout, irqs, flags;
170
171 probe_irq_off(probe_irq_on());
172 irqs = probe_irq_on();
173 SELECT_MASK(HWIF(drive), drive, 1);
174 if (IDE_CONTROL_REG)
175 OUT_BYTE(drive->ctl,IDE_CONTROL_REG);
176 ide_delay_50ms();
177 OUT_BYTE(WIN_IDENTIFY, IDE_COMMAND_REG);
178 timeout = jiffies + WAIT_WORSTCASE;
179 do {
180 if (0 < (signed long)(jiffies - timeout)) {
181 if (irqs)
182 (void) probe_irq_off(irqs);
183 SELECT_MASK(HWIF(drive), drive, 0);
184 return 0; /* drive timed-out */
185 }
186 ide_delay_50ms(); /* give drive a breather */
187 } while (IN_BYTE(IDE_ALTSTATUS_REG) & BUSY_STAT);
188 ide_delay_50ms(); /* wait for IRQ and DRQ_STAT */
189 if (!OK_STAT(GET_STAT(),DRQ_STAT,BAD_R_STAT)) {
190 SELECT_MASK(HWIF(drive), drive, 0);
191 printk("%s: CHECK for good STATUS\n", drive->name);
192 return 0;
193 }
194 __save_flags(flags); /* local CPU only */
195 __cli(); /* local CPU only; some systems need this */
196 SELECT_MASK(HWIF(drive), drive, 0);
197 id = kmalloc(SECTOR_WORDS*4, GFP_ATOMIC);
198 ide_input_data(drive, id, SECTOR_WORDS);
199 (void) GET_STAT(); /* clear drive IRQ */
200 ide__sti(); /* local CPU only */
201 __restore_flags(flags); /* local CPU only */
202 ide_fix_driveid(id);
203 if (id) {
204 drive->id->dma_ultra = id->dma_ultra;
205 drive->id->dma_mword = id->dma_mword;
206 drive->id->dma_1word = id->dma_1word;
207 /* anything more ? */
208 kfree(id);
209 }
210
211 return 1;
212 }
213
214 /*
215 * Verify that we are doing an approved SETFEATURES_XFER with respect
216 * to the hardware being able to support request. Since some hardware
217 * can improperly report capabilties, we check to see if the host adapter
218 * in combination with the device (usually a disk) properly detect
219 * and acknowledge each end of the ribbon.
220 */
221 int ide_ata66_check (ide_drive_t *drive, byte cmd, byte nsect, byte feature)
222 {
223 if ((cmd == WIN_SETFEATURES) &&
224 (nsect > XFER_UDMA_2) &&
225 (feature == SETFEATURES_XFER)) {
226 if (!HWIF(drive)->udma_four) {
227 printk("%s: Speed warnings UDMA 3/4/5 is not functional.\n", HWIF(drive)->name);
228 return 1;
229 }
230 #ifndef CONFIG_IDEDMA_IVB
231 if ((drive->id->hw_config & 0x6000) == 0) {
232 #else /* !CONFIG_IDEDMA_IVB */
233 if ((drive->id->hw_config & 0x2000) == 0) {
234 #endif /* CONFIG_IDEDMA_IVB */
235 printk("%s: Speed warnings UDMA 3/4/5 is not functional.\n", drive->name);
236 return 1;
237 }
238 }
239 return 0;
240 }
241
242 /*
243 * Backside of HDIO_DRIVE_CMD call of SETFEATURES_XFER.
244 * 1 : Safe to update drive->id DMA registers.
245 * 0 : OOPs not allowed.
246 */
247 int set_transfer (ide_drive_t *drive, byte cmd, byte nsect, byte feature)
248 {
249 if ((cmd == WIN_SETFEATURES) &&
250 (nsect >= XFER_SW_DMA_0) &&
251 (feature == SETFEATURES_XFER) &&
252 (drive->id->dma_ultra ||
253 drive->id->dma_mword ||
254 drive->id->dma_1word))
255 return 1;
256
257 return 0;
258 }
259
260 /*
261 * All hosts that use the 80c ribbon mus use!
262 */
263 byte eighty_ninty_three (ide_drive_t *drive)
264 {
265 return ((byte) ((HWIF(drive)->udma_four) &&
266 #ifndef CONFIG_IDEDMA_IVB
267 (drive->id->hw_config & 0x4000) &&
268 #endif /* CONFIG_IDEDMA_IVB */
269 (drive->id->hw_config & 0x2000)) ? 1 : 0);
270 }
271
272 /*
273 * Similar to ide_wait_stat(), except it never calls ide_error internally.
274 * This is a kludge to handle the new ide_config_drive_speed() function,
275 * and should not otherwise be used anywhere. Eventually, the tuneproc's
276 * should be updated to return ide_startstop_t, in which case we can get
277 * rid of this abomination again. :) -ml
278 *
279 * It is gone..........
280 *
281 * const char *msg == consider adding for verbose errors.
282 */
283 int ide_config_drive_speed (ide_drive_t *drive, byte speed)
284 {
285 ide_hwif_t *hwif = HWIF(drive);
286 int i, error = 1;
287 byte stat;
288
289 #if defined(CONFIG_BLK_DEV_IDEDMA) && !defined(CONFIG_DMA_NONPCI)
290 byte unit = (drive->select.b.unit & 0x01);
291 outb(inb(hwif->dma_base+2) & ~(1<<(5+unit)), hwif->dma_base+2);
292 #endif /* (CONFIG_BLK_DEV_IDEDMA) && !(CONFIG_DMA_NONPCI) */
293
294 /*
295 * Don't use ide_wait_cmd here - it will
296 * attempt to set_geometry and recalibrate,
297 * but for some reason these don't work at
298 * this point (lost interrupt).
299 */
300 /*
301 * Select the drive, and issue the SETFEATURES command
302 */
303 disable_irq(hwif->irq); /* disable_irq_nosync ?? */
304 udelay(1);
305 SELECT_DRIVE(HWIF(drive), drive);
306 SELECT_MASK(HWIF(drive), drive, 0);
307 udelay(1);
308 if (IDE_CONTROL_REG)
309 OUT_BYTE(drive->ctl | 2, IDE_CONTROL_REG);
310 OUT_BYTE(speed, IDE_NSECTOR_REG);
311 OUT_BYTE(SETFEATURES_XFER, IDE_FEATURE_REG);
312 OUT_BYTE(WIN_SETFEATURES, IDE_COMMAND_REG);
313 if ((IDE_CONTROL_REG) && (SETFEATURES_CONTROL_REG))
314 OUT_BYTE(drive->ctl, IDE_CONTROL_REG);
315 udelay(1);
316 /*
317 * Wait for drive to become non-BUSY
318 */
319 if ((stat = GET_STAT()) & BUSY_STAT) {
320 unsigned long flags, timeout;
321 __save_flags(flags); /* local CPU only */
322 ide__sti(); /* local CPU only -- for jiffies */
323 timeout = jiffies + WAIT_CMD;
324 while ((stat = GET_STAT()) & BUSY_STAT) {
325 if (0 < (signed long)(jiffies - timeout))
326 break;
327 }
328 __restore_flags(flags); /* local CPU only */
329 }
330
331 /*
332 * Allow status to settle, then read it again.
333 * A few rare drives vastly violate the 400ns spec here,
334 * so we'll wait up to 10usec for a "good" status
335 * rather than expensively fail things immediately.
336 * This fix courtesy of Matthew Faupel & Niccolo Rigacci.
337 */
338 for (i = 0; i < 10; i++) {
339 udelay(1);
340 if (OK_STAT((stat = GET_STAT()), DRIVE_READY, BUSY_STAT|DRQ_STAT|ERR_STAT)) {
341 error = 0;
342 break;
343 }
344 }
345
346 SELECT_MASK(HWIF(drive), drive, 0);
347
348 enable_irq(hwif->irq);
349
350 if (error) {
351 (void) ide_dump_status(drive, "set_drive_speed_status", stat);
352 return error;
353 }
354
355 drive->id->dma_ultra &= ~0xFF00;
356 drive->id->dma_mword &= ~0x0F00;
357 drive->id->dma_1word &= ~0x0F00;
358
359 #if defined(CONFIG_BLK_DEV_IDEDMA) && !defined(CONFIG_DMA_NONPCI)
360 if (speed > XFER_PIO_4) {
361 outb(inb(hwif->dma_base+2)|(1<<(5+unit)), hwif->dma_base+2);
362 } else {
363 outb(inb(hwif->dma_base+2) & ~(1<<(5+unit)), hwif->dma_base+2);
364 }
365 #endif /* (CONFIG_BLK_DEV_IDEDMA) && !(CONFIG_DMA_NONPCI) */
366
367 switch(speed) {
368 case XFER_UDMA_7: drive->id->dma_ultra |= 0x8080; break;
369 case XFER_UDMA_6: drive->id->dma_ultra |= 0x4040; break;
370 case XFER_UDMA_5: drive->id->dma_ultra |= 0x2020; break;
371 case XFER_UDMA_4: drive->id->dma_ultra |= 0x1010; break;
372 case XFER_UDMA_3: drive->id->dma_ultra |= 0x0808; break;
373 case XFER_UDMA_2: drive->id->dma_ultra |= 0x0404; break;
374 case XFER_UDMA_1: drive->id->dma_ultra |= 0x0202; break;
375 case XFER_UDMA_0: drive->id->dma_ultra |= 0x0101; break;
376 case XFER_MW_DMA_2: drive->id->dma_mword |= 0x0404; break;
377 case XFER_MW_DMA_1: drive->id->dma_mword |= 0x0202; break;
378 case XFER_MW_DMA_0: drive->id->dma_mword |= 0x0101; break;
379 case XFER_SW_DMA_2: drive->id->dma_1word |= 0x0404; break;
380 case XFER_SW_DMA_1: drive->id->dma_1word |= 0x0202; break;
381 case XFER_SW_DMA_0: drive->id->dma_1word |= 0x0101; break;
382 default: break;
383 }
384 return error;
385 }
386
387 EXPORT_SYMBOL(ide_auto_reduce_xfer);
388 EXPORT_SYMBOL(ide_driveid_update);
389 EXPORT_SYMBOL(ide_ata66_check);
390 EXPORT_SYMBOL(set_transfer);
391 EXPORT_SYMBOL(eighty_ninty_three);
392 EXPORT_SYMBOL(ide_config_drive_speed);
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