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Merge with Linux 2.4.0-test6-pre2.
[linux-2.6/linux-mips.git] / drivers / ide / ide-features.c
blobfa765d76f21f4095fcbab3ddc5fd20e1a3fa0629
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 /*
43 * A Verbose noise maker for debugging on the attempted transfer rates.
44 */
45 char *ide_xfer_verbose (byte xfer_rate)
46 {
47 switch(xfer_rate) {
48 case XFER_UDMA_7: return("UDMA 7");
49 case XFER_UDMA_6: return("UDMA 6");
50 case XFER_UDMA_5: return("UDMA 5");
51 case XFER_UDMA_4: return("UDMA 4");
52 case XFER_UDMA_3: return("UDMA 3");
53 case XFER_UDMA_2: return("UDMA 2");
54 case XFER_UDMA_1: return("UDMA 1");
55 case XFER_UDMA_0: return("UDMA 0");
56 case XFER_MW_DMA_2: return("MW DMA 2");
57 case XFER_MW_DMA_1: return("MW DMA 1");
58 case XFER_MW_DMA_0: return("MW DMA 0");
59 case XFER_SW_DMA_2: return("SW DMA 2");
60 case XFER_SW_DMA_1: return("SW DMA 1");
61 case XFER_SW_DMA_0: return("SW DMA 0");
62 case XFER_PIO_4: return("PIO 4");
63 case XFER_PIO_3: return("PIO 3");
64 case XFER_PIO_2: return("PIO 2");
65 case XFER_PIO_1: return("PIO 1");
66 case XFER_PIO_0: return("PIO 0");
67 case XFER_PIO_SLOW: return("PIO SLOW");
68 default: return("XFER ERROR");
69 }
70 }
71
72 /*
73 *
74 */
75 char *ide_media_verbose (ide_drive_t *drive)
76 {
77 switch (drive->media) {
78 case ide_scsi: return("scsi ");
79 case ide_disk: return("disk ");
80 case ide_optical: return("optical");
81 case ide_cdrom: return("cdrom ");
82 case ide_tape: return("tape ");
83 case ide_floppy: return("floppy ");
84 default: return("???????");
85 }
86 }
87
88 /*
89 * A Verbose noise maker for debugging on the attempted dmaing calls.
90 */
91 char *ide_dmafunc_verbose (ide_dma_action_t dmafunc)
92 {
93 switch (dmafunc) {
94 case ide_dma_read: return("ide_dma_read");
95 case ide_dma_write: return("ide_dma_write");
96 case ide_dma_begin: return("ide_dma_begin");
97 case ide_dma_end: return("ide_dma_end:");
98 case ide_dma_check: return("ide_dma_check");
99 case ide_dma_on: return("ide_dma_on");
100 case ide_dma_off: return("ide_dma_off");
101 case ide_dma_off_quietly: return("ide_dma_off_quietly");
102 case ide_dma_test_irq: return("ide_dma_test_irq");
103 case ide_dma_bad_drive: return("ide_dma_bad_drive");
104 case ide_dma_good_drive: return("ide_dma_good_drive");
105 case ide_dma_verbose: return("ide_dma_verbose");
106 case ide_dma_retune: return("ide_dma_retune");
107 case ide_dma_lostirq: return("ide_dma_lostirq");
108 case ide_dma_timeout: return("ide_dma_timeout");
109 default: return("unknown");
110 }
111 }
112
113 /*
114 *
115 */
116 byte ide_auto_reduce_xfer (ide_drive_t *drive)
117 {
118 if (!drive->crc_count)
119 return drive->current_speed;
120 drive->crc_count = 0;
121
122 switch(drive->current_speed) {
123 case XFER_UDMA_7: return XFER_UDMA_6;
124 case XFER_UDMA_6: return XFER_UDMA_5;
125 case XFER_UDMA_5: return XFER_UDMA_4;
126 case XFER_UDMA_4: return XFER_UDMA_3;
127 case XFER_UDMA_3: return XFER_UDMA_2;
128 case XFER_UDMA_2: return XFER_UDMA_1;
129 case XFER_UDMA_1: return XFER_UDMA_0;
130 case XFER_UDMA_0:
131 if (drive->id->dma_mword & 0x0004) return XFER_MW_DMA_2;
132 else if (drive->id->dma_mword & 0x0002) return XFER_MW_DMA_1;
133 else if (drive->id->dma_mword & 0x0001) return XFER_MW_DMA_0;
134 else return XFER_PIO_4;
135 case XFER_MW_DMA_2: return XFER_MW_DMA_1;
136 case XFER_MW_DMA_1: return XFER_MW_DMA_0;
137 case XFER_MW_DMA_0:
138 if (drive->id->dma_1word & 0x0004) return XFER_SW_DMA_2;
139 else if (drive->id->dma_1word & 0x0002) return XFER_SW_DMA_1;
140 else if (drive->id->dma_1word & 0x0001) return XFER_SW_DMA_0;
141 else return XFER_PIO_4;
142 case XFER_SW_DMA_2: return XFER_SW_DMA_1;
143 case XFER_SW_DMA_1: return XFER_SW_DMA_0;
144 case XFER_SW_DMA_0:
145 {
146 return XFER_PIO_4;
147 }
148 case XFER_PIO_4: return XFER_PIO_3;
149 case XFER_PIO_3: return XFER_PIO_2;
150 case XFER_PIO_2: return XFER_PIO_1;
151 case XFER_PIO_1: return XFER_PIO_0;
152 case XFER_PIO_0:
153 default: return XFER_PIO_SLOW;
154 }
155 }
156
157 /*
158 * Update the
159 */
160 int ide_driveid_update (ide_drive_t *drive)
161 {
162 /*
163 * Re-read drive->id for possible DMA mode
164 * change (copied from ide-probe.c)
165 */
166 struct hd_driveid *id;
167 unsigned long timeout, flags;
168
169 SELECT_MASK(HWIF(drive), drive, 1);
170 if (IDE_CONTROL_REG)
171 OUT_BYTE(drive->ctl,IDE_CONTROL_REG);
172 ide_delay_50ms();
173 OUT_BYTE(WIN_IDENTIFY, IDE_COMMAND_REG);
174 timeout = jiffies + WAIT_WORSTCASE;
175 do {
176 if (0 < (signed long)(jiffies - timeout)) {
177 SELECT_MASK(HWIF(drive), drive, 0);
178 return 0; /* drive timed-out */
179 }
180 ide_delay_50ms(); /* give drive a breather */
181 } while (IN_BYTE(IDE_ALTSTATUS_REG) & BUSY_STAT);
182 ide_delay_50ms(); /* wait for IRQ and DRQ_STAT */
183 if (!OK_STAT(GET_STAT(),DRQ_STAT,BAD_R_STAT)) {
184 SELECT_MASK(HWIF(drive), drive, 0);
185 printk("%s: CHECK for good STATUS\n", drive->name);
186 return 0;
187 }
188 __save_flags(flags); /* local CPU only */
189 __cli(); /* local CPU only; some systems need this */
190 SELECT_MASK(HWIF(drive), drive, 0);
191 id = kmalloc(SECTOR_WORDS*4, GFP_ATOMIC);
192 ide_input_data(drive, id, SECTOR_WORDS);
193 (void) GET_STAT(); /* clear drive IRQ */
194 ide__sti(); /* local CPU only */
195 __restore_flags(flags); /* local CPU only */
196 ide_fix_driveid(id);
197 if (id) {
198 drive->id->dma_ultra = id->dma_ultra;
199 drive->id->dma_mword = id->dma_mword;
200 drive->id->dma_1word = id->dma_1word;
201 /* anything more ? */
202 kfree(id);
203 }
204
205 return 1;
206 }
207
208 /*
209 * Verify that we are doing an approved SETFEATURES_XFER with respect
210 * to the hardware being able to support request. Since some hardware
211 * can improperly report capabilties, we check to see if the host adapter
212 * in combination with the device (usually a disk) properly detect
213 * and acknowledge each end of the ribbon.
214 */
215 int ide_ata66_check (ide_drive_t *drive, byte cmd, byte nsect, byte feature)
216 {
217 if ((cmd == WIN_SETFEATURES) &&
218 (nsect > XFER_UDMA_2) &&
219 (feature == SETFEATURES_XFER)) {
220 if (!HWIF(drive)->udma_four) {
221 printk("%s: Speed warnings UDMA 3/4/5 is not functional.\n", HWIF(drive)->name);
222 return 1;
223 }
224 #ifndef CONFIG_IDEDMA_IVB
225 if ((drive->id->hw_config & 0x6000) == 0) {
226 #else /* !CONFIG_IDEDMA_IVB */
227 if ((drive->id->hw_config & 0x2000) == 0) {
228 #endif /* CONFIG_IDEDMA_IVB */
229 printk("%s: Speed warnings UDMA 3/4/5 is not functional.\n", drive->name);
230 return 1;
231 }
232 }
233 return 0;
234 }
235
236 /*
237 * Backside of HDIO_DRIVE_CMD call of SETFEATURES_XFER.
238 * 1 : Safe to update drive->id DMA registers.
239 * 0 : OOPs not allowed.
240 */
241 int set_transfer (ide_drive_t *drive, byte cmd, byte nsect, byte feature)
242 {
243 if ((cmd == WIN_SETFEATURES) &&
244 (nsect >= XFER_SW_DMA_0) &&
245 (feature == SETFEATURES_XFER) &&
246 (drive->id->dma_ultra ||
247 drive->id->dma_mword ||
248 drive->id->dma_1word))
249 return 1;
250
251 return 0;
252 }
253
254 /*
255 * All hosts that use the 80c ribbon mus use!
256 */
257 byte eighty_ninty_three (ide_drive_t *drive)
258 {
259 return ((byte) ((HWIF(drive)->udma_four) &&
260 #ifndef CONFIG_IDEDMA_IVB
261 (drive->id->hw_config & 0x4000) &&
262 #endif /* CONFIG_IDEDMA_IVB */
263 (drive->id->hw_config & 0x2000)) ? 1 : 0);
264 }
265
266 /*
267 * Similar to ide_wait_stat(), except it never calls ide_error internally.
268 * This is a kludge to handle the new ide_config_drive_speed() function,
269 * and should not otherwise be used anywhere. Eventually, the tuneproc's
270 * should be updated to return ide_startstop_t, in which case we can get
271 * rid of this abomination again. :) -ml
272 *
273 * It is gone..........
274 *
275 * const char *msg == consider adding for verbose errors.
276 */
277 int ide_config_drive_speed (ide_drive_t *drive, byte speed)
278 {
279 ide_hwif_t *hwif = HWIF(drive);
280 int i, error = 1;
281 byte stat;
282
283 #if defined(CONFIG_BLK_DEV_IDEDMA) && !defined(CONFIG_DMA_NONPCI)
284 byte unit = (drive->select.b.unit & 0x01);
285 outb(inb(hwif->dma_base+2) & ~(1<<(5+unit)), hwif->dma_base+2);
286 #endif /* (CONFIG_BLK_DEV_IDEDMA) && !(CONFIG_DMA_NONPCI) */
287
288 /*
289 * Don't use ide_wait_cmd here - it will
290 * attempt to set_geometry and recalibrate,
291 * but for some reason these don't work at
292 * this point (lost interrupt).
293 */
294 /*
295 * Select the drive, and issue the SETFEATURES command
296 */
297 disable_irq(hwif->irq); /* disable_irq_nosync ?? */
298 udelay(1);
299 SELECT_DRIVE(HWIF(drive), drive);
300 SELECT_MASK(HWIF(drive), drive, 0);
301 udelay(1);
302 if (IDE_CONTROL_REG)
303 OUT_BYTE(drive->ctl | 2, IDE_CONTROL_REG);
304 OUT_BYTE(speed, IDE_NSECTOR_REG);
305 OUT_BYTE(SETFEATURES_XFER, IDE_FEATURE_REG);
306 OUT_BYTE(WIN_SETFEATURES, IDE_COMMAND_REG);
307 if ((IDE_CONTROL_REG) && (drive->quirk_list == 2))
308 OUT_BYTE(drive->ctl, IDE_CONTROL_REG);
309 udelay(1);
310 /*
311 * Wait for drive to become non-BUSY
312 */
313 if ((stat = GET_STAT()) & BUSY_STAT) {
314 unsigned long flags, timeout;
315 __save_flags(flags); /* local CPU only */
316 ide__sti(); /* local CPU only -- for jiffies */
317 timeout = jiffies + WAIT_CMD;
318 while ((stat = GET_STAT()) & BUSY_STAT) {
319 if (0 < (signed long)(jiffies - timeout))
320 break;
321 }
322 __restore_flags(flags); /* local CPU only */
323 }
324
325 /*
326 * Allow status to settle, then read it again.
327 * A few rare drives vastly violate the 400ns spec here,
328 * so we'll wait up to 10usec for a "good" status
329 * rather than expensively fail things immediately.
330 * This fix courtesy of Matthew Faupel & Niccolo Rigacci.
331 */
332 for (i = 0; i < 10; i++) {
333 udelay(1);
334 if (OK_STAT((stat = GET_STAT()), DRIVE_READY, BUSY_STAT|DRQ_STAT|ERR_STAT)) {
335 error = 0;
336 break;
337 }
338 }
339
340 SELECT_MASK(HWIF(drive), drive, 0);
341
342 enable_irq(hwif->irq);
343
344 if (error) {
345 (void) ide_dump_status(drive, "set_drive_speed_status", stat);
346 return error;
347 }
348
349 drive->id->dma_ultra &= ~0xFF00;
350 drive->id->dma_mword &= ~0x0F00;
351 drive->id->dma_1word &= ~0x0F00;
352
353 #if defined(CONFIG_BLK_DEV_IDEDMA) && !defined(CONFIG_DMA_NONPCI)
354 if (speed > XFER_PIO_4) {
355 outb(inb(hwif->dma_base+2)|(1<<(5+unit)), hwif->dma_base+2);
356 } else {
357 outb(inb(hwif->dma_base+2) & ~(1<<(5+unit)), hwif->dma_base+2);
358 }
359 #endif /* (CONFIG_BLK_DEV_IDEDMA) && !(CONFIG_DMA_NONPCI) */
360
361 switch(speed) {
362 case XFER_UDMA_7: drive->id->dma_ultra |= 0x8080; break;
363 case XFER_UDMA_6: drive->id->dma_ultra |= 0x4040; break;
364 case XFER_UDMA_5: drive->id->dma_ultra |= 0x2020; break;
365 case XFER_UDMA_4: drive->id->dma_ultra |= 0x1010; break;
366 case XFER_UDMA_3: drive->id->dma_ultra |= 0x0808; break;
367 case XFER_UDMA_2: drive->id->dma_ultra |= 0x0404; break;
368 case XFER_UDMA_1: drive->id->dma_ultra |= 0x0202; break;
369 case XFER_UDMA_0: drive->id->dma_ultra |= 0x0101; break;
370 case XFER_MW_DMA_2: drive->id->dma_mword |= 0x0404; break;
371 case XFER_MW_DMA_1: drive->id->dma_mword |= 0x0202; break;
372 case XFER_MW_DMA_0: drive->id->dma_mword |= 0x0101; break;
373 case XFER_SW_DMA_2: drive->id->dma_1word |= 0x0404; break;
374 case XFER_SW_DMA_1: drive->id->dma_1word |= 0x0202; break;
375 case XFER_SW_DMA_0: drive->id->dma_1word |= 0x0101; break;
376 default: break;
377 }
378 return error;
379 }
380
381 EXPORT_SYMBOL(ide_auto_reduce_xfer);
382 EXPORT_SYMBOL(ide_driveid_update);
383 EXPORT_SYMBOL(ide_ata66_check);
384 EXPORT_SYMBOL(set_transfer);
385 EXPORT_SYMBOL(eighty_ninty_three);
386 EXPORT_SYMBOL(ide_config_drive_speed);
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