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1da177e4 LT |
1 | /* |
2 | * linux/drivers/ide/legacy/ht6560b.c Version 0.07 Feb 1, 2000 | |
3 | * | |
4 | * Copyright (C) 1995-2000 Linus Torvalds & author (see below) | |
5 | */ | |
6 | ||
7 | /* | |
8 | * | |
9 | * Version 0.01 Initial version hacked out of ide.c | |
10 | * | |
11 | * Version 0.02 Added support for PIO modes, auto-tune | |
12 | * | |
13 | * Version 0.03 Some cleanups | |
14 | * | |
15 | * Version 0.05 PIO mode cycle timings auto-tune using bus-speed | |
16 | * | |
17 | * Version 0.06 Prefetch mode now defaults no OFF. To set | |
18 | * prefetch mode OFF/ON use "hdparm -p8/-p9". | |
19 | * Unmask irq is disabled when prefetch mode | |
20 | * is enabled. | |
21 | * | |
22 | * Version 0.07 Trying to fix CD-ROM detection problem. | |
23 | * "Prefetch" mode bit OFF for ide disks and | |
24 | * ON for anything else. | |
25 | * | |
26 | * | |
27 | * HT-6560B EIDE-controller support | |
28 | * To activate controller support use kernel parameter "ide0=ht6560b". | |
29 | * Use hdparm utility to enable PIO mode support. | |
30 | * | |
31 | * Author: Mikko Ala-Fossi <maf@iki.fi> | |
32 | * Jan Evert van Grootheest <janevert@iae.nl> | |
33 | * | |
34 | * Try: http://www.maf.iki.fi/~maf/ht6560b/ | |
35 | */ | |
36 | ||
37 | #define HT6560B_VERSION "v0.07" | |
38 | ||
39 | #undef REALLY_SLOW_IO /* most systems can safely undef this */ | |
40 | ||
41 | #include <linux/module.h> | |
42 | #include <linux/config.h> | |
43 | #include <linux/types.h> | |
44 | #include <linux/kernel.h> | |
45 | #include <linux/delay.h> | |
46 | #include <linux/timer.h> | |
47 | #include <linux/mm.h> | |
48 | #include <linux/ioport.h> | |
49 | #include <linux/blkdev.h> | |
50 | #include <linux/hdreg.h> | |
51 | #include <linux/ide.h> | |
52 | #include <linux/init.h> | |
53 | ||
54 | #include <asm/io.h> | |
55 | ||
56 | /* #define DEBUG */ /* remove comments for DEBUG messages */ | |
57 | ||
58 | /* | |
59 | * The special i/o-port that HT-6560B uses to configuration: | |
60 | * bit0 (0x01): "1" selects secondary interface | |
61 | * bit2 (0x04): "1" enables FIFO function | |
62 | * bit5 (0x20): "1" enables prefetched data read function (???) | |
63 | * | |
64 | * The special i/o-port that HT-6560A uses to configuration: | |
65 | * bit0 (0x01): "1" selects secondary interface | |
66 | * bit1 (0x02): "1" enables prefetched data read function | |
67 | * bit2 (0x04): "0" enables multi-master system (?) | |
68 | * bit3 (0x08): "1" 3 cycle time, "0" 2 cycle time (?) | |
69 | */ | |
70 | #define HT_CONFIG_PORT 0x3e6 | |
71 | #define HT_CONFIG(drivea) (u8)(((drivea)->drive_data & 0xff00) >> 8) | |
72 | /* | |
73 | * FIFO + PREFETCH (both a/b-model) | |
74 | */ | |
75 | #define HT_CONFIG_DEFAULT 0x1c /* no prefetch */ | |
76 | /* #define HT_CONFIG_DEFAULT 0x3c */ /* with prefetch */ | |
77 | #define HT_SECONDARY_IF 0x01 | |
78 | #define HT_PREFETCH_MODE 0x20 | |
79 | ||
80 | /* | |
81 | * ht6560b Timing values: | |
82 | * | |
83 | * I reviewed some assembler source listings of htide drivers and found | |
84 | * out how they setup those cycle time interfacing values, as they at Holtek | |
85 | * call them. IDESETUP.COM that is supplied with the drivers figures out | |
86 | * optimal values and fetches those values to drivers. I found out that | |
87 | * they use IDE_SELECT_REG to fetch timings to the ide board right after | |
88 | * interface switching. After that it was quite easy to add code to | |
89 | * ht6560b.c. | |
90 | * | |
91 | * IDESETUP.COM gave me values 0x24, 0x45, 0xaa, 0xff that worked fine | |
92 | * for hda and hdc. But hdb needed higher values to work, so I guess | |
93 | * that sometimes it is necessary to give higher value than IDESETUP | |
94 | * gives. [see cmd640.c for an extreme example of this. -ml] | |
95 | * | |
96 | * Perhaps I should explain something about these timing values: | |
97 | * The higher nibble of value is the Recovery Time (rt) and the lower nibble | |
98 | * of the value is the Active Time (at). Minimum value 2 is the fastest and | |
99 | * the maximum value 15 is the slowest. Default values should be 15 for both. | |
100 | * So 0x24 means 2 for rt and 4 for at. Each of the drives should have | |
101 | * both values, and IDESETUP gives automatically rt=15 st=15 for CDROMs or | |
102 | * similar. If value is too small there will be all sorts of failures. | |
103 | * | |
104 | * Timing byte consists of | |
105 | * High nibble: Recovery Cycle Time (rt) | |
106 | * The valid values range from 2 to 15. The default is 15. | |
107 | * | |
108 | * Low nibble: Active Cycle Time (at) | |
109 | * The valid values range from 2 to 15. The default is 15. | |
110 | * | |
111 | * You can obtain optimized timing values by running Holtek IDESETUP.COM | |
112 | * for DOS. DOS drivers get their timing values from command line, where | |
113 | * the first value is the Recovery Time and the second value is the | |
114 | * Active Time for each drive. Smaller value gives higher speed. | |
115 | * In case of failures you should probably fall back to a higher value. | |
116 | */ | |
117 | #define HT_TIMING(drivea) (u8)((drivea)->drive_data & 0x00ff) | |
118 | #define HT_TIMING_DEFAULT 0xff | |
119 | ||
120 | /* | |
121 | * This routine handles interface switching for the peculiar hardware design | |
122 | * on the F.G.I./Holtek HT-6560B VLB IDE interface. | |
123 | * The HT-6560B can only enable one IDE port at a time, and requires a | |
124 | * silly sequence (below) whenever we switch between primary and secondary. | |
125 | */ | |
126 | ||
127 | /* | |
128 | * This routine is invoked from ide.c to prepare for access to a given drive. | |
129 | */ | |
130 | static void ht6560b_selectproc (ide_drive_t *drive) | |
131 | { | |
132 | unsigned long flags; | |
133 | static u8 current_select = 0; | |
134 | static u8 current_timing = 0; | |
135 | u8 select, timing; | |
136 | ||
137 | local_irq_save(flags); | |
138 | ||
139 | select = HT_CONFIG(drive); | |
140 | timing = HT_TIMING(drive); | |
141 | ||
142 | if (select != current_select || timing != current_timing) { | |
143 | current_select = select; | |
144 | current_timing = timing; | |
145 | if (drive->media != ide_disk || !drive->present) | |
146 | select |= HT_PREFETCH_MODE; | |
147 | (void) HWIF(drive)->INB(HT_CONFIG_PORT); | |
148 | (void) HWIF(drive)->INB(HT_CONFIG_PORT); | |
149 | (void) HWIF(drive)->INB(HT_CONFIG_PORT); | |
150 | (void) HWIF(drive)->INB(HT_CONFIG_PORT); | |
151 | HWIF(drive)->OUTB(select, HT_CONFIG_PORT); | |
152 | /* | |
153 | * Set timing for this drive: | |
154 | */ | |
155 | HWIF(drive)->OUTB(timing, IDE_SELECT_REG); | |
156 | (void) HWIF(drive)->INB(IDE_STATUS_REG); | |
157 | #ifdef DEBUG | |
158 | printk("ht6560b: %s: select=%#x timing=%#x\n", | |
159 | drive->name, select, timing); | |
160 | #endif | |
161 | } | |
162 | local_irq_restore(flags); | |
163 | } | |
164 | ||
165 | /* | |
166 | * Autodetection and initialization of ht6560b | |
167 | */ | |
168 | static int __init try_to_init_ht6560b(void) | |
169 | { | |
170 | u8 orig_value; | |
171 | int i; | |
172 | ||
173 | /* Autodetect ht6560b */ | |
174 | if ((orig_value = inb(HT_CONFIG_PORT)) == 0xff) | |
175 | return 0; | |
176 | ||
177 | for (i=3;i>0;i--) { | |
178 | outb(0x00, HT_CONFIG_PORT); | |
179 | if (!( (~inb(HT_CONFIG_PORT)) & 0x3f )) { | |
180 | outb(orig_value, HT_CONFIG_PORT); | |
181 | return 0; | |
182 | } | |
183 | } | |
184 | outb(0x00, HT_CONFIG_PORT); | |
185 | if ((~inb(HT_CONFIG_PORT))& 0x3f) { | |
186 | outb(orig_value, HT_CONFIG_PORT); | |
187 | return 0; | |
188 | } | |
189 | /* | |
190 | * Ht6560b autodetected | |
191 | */ | |
192 | outb(HT_CONFIG_DEFAULT, HT_CONFIG_PORT); | |
193 | outb(HT_TIMING_DEFAULT, 0x1f6); /* IDE_SELECT_REG */ | |
194 | (void) inb(0x1f7); /* IDE_STATUS_REG */ | |
195 | ||
196 | printk("\nht6560b " HT6560B_VERSION | |
197 | ": chipset detected and initialized" | |
198 | #ifdef DEBUG | |
199 | " with debug enabled" | |
200 | #endif | |
201 | ); | |
202 | return 1; | |
203 | } | |
204 | ||
205 | static u8 ht_pio2timings(ide_drive_t *drive, u8 pio) | |
206 | { | |
207 | int active_time, recovery_time; | |
208 | int active_cycles, recovery_cycles; | |
209 | ide_pio_data_t d; | |
210 | int bus_speed = system_bus_clock(); | |
211 | ||
212 | if (pio) { | |
213 | pio = ide_get_best_pio_mode(drive, pio, 5, &d); | |
214 | ||
215 | /* | |
216 | * Just like opti621.c we try to calculate the | |
217 | * actual cycle time for recovery and activity | |
218 | * according system bus speed. | |
219 | */ | |
220 | active_time = ide_pio_timings[pio].active_time; | |
221 | recovery_time = d.cycle_time | |
222 | - active_time | |
223 | - ide_pio_timings[pio].setup_time; | |
224 | /* | |
225 | * Cycle times should be Vesa bus cycles | |
226 | */ | |
227 | active_cycles = (active_time * bus_speed + 999) / 1000; | |
228 | recovery_cycles = (recovery_time * bus_speed + 999) / 1000; | |
229 | /* | |
230 | * Upper and lower limits | |
231 | */ | |
232 | if (active_cycles < 2) active_cycles = 2; | |
233 | if (recovery_cycles < 2) recovery_cycles = 2; | |
234 | if (active_cycles > 15) active_cycles = 15; | |
235 | if (recovery_cycles > 15) recovery_cycles = 0; /* 0==16 */ | |
236 | ||
237 | #ifdef DEBUG | |
238 | printk("ht6560b: drive %s setting pio=%d recovery=%d (%dns) active=%d (%dns)\n", drive->name, pio, recovery_cycles, recovery_time, active_cycles, active_time); | |
239 | #endif | |
240 | ||
241 | return (u8)((recovery_cycles << 4) | active_cycles); | |
242 | } else { | |
243 | ||
244 | #ifdef DEBUG | |
245 | printk("ht6560b: drive %s setting pio=0\n", drive->name); | |
246 | #endif | |
247 | ||
248 | return HT_TIMING_DEFAULT; /* default setting */ | |
249 | } | |
250 | } | |
251 | ||
252 | /* | |
253 | * Enable/Disable so called prefetch mode | |
254 | */ | |
255 | static void ht_set_prefetch(ide_drive_t *drive, u8 state) | |
256 | { | |
257 | unsigned long flags; | |
258 | int t = HT_PREFETCH_MODE << 8; | |
259 | ||
260 | spin_lock_irqsave(&ide_lock, flags); | |
261 | ||
262 | /* | |
263 | * Prefetch mode and unmask irq seems to conflict | |
264 | */ | |
265 | if (state) { | |
266 | drive->drive_data |= t; /* enable prefetch mode */ | |
267 | drive->no_unmask = 1; | |
268 | drive->unmask = 0; | |
269 | } else { | |
270 | drive->drive_data &= ~t; /* disable prefetch mode */ | |
271 | drive->no_unmask = 0; | |
272 | } | |
273 | ||
274 | spin_unlock_irqrestore(&ide_lock, flags); | |
275 | ||
276 | #ifdef DEBUG | |
277 | printk("ht6560b: drive %s prefetch mode %sabled\n", drive->name, (state ? "en" : "dis")); | |
278 | #endif | |
279 | } | |
280 | ||
281 | static void tune_ht6560b (ide_drive_t *drive, u8 pio) | |
282 | { | |
283 | unsigned long flags; | |
284 | u8 timing; | |
285 | ||
286 | switch (pio) { | |
287 | case 8: /* set prefetch off */ | |
288 | case 9: /* set prefetch on */ | |
289 | ht_set_prefetch(drive, pio & 1); | |
290 | return; | |
291 | } | |
292 | ||
293 | timing = ht_pio2timings(drive, pio); | |
294 | ||
295 | spin_lock_irqsave(&ide_lock, flags); | |
296 | ||
297 | drive->drive_data &= 0xff00; | |
298 | drive->drive_data |= timing; | |
299 | ||
300 | spin_unlock_irqrestore(&ide_lock, flags); | |
301 | ||
302 | #ifdef DEBUG | |
303 | printk("ht6560b: drive %s tuned to pio mode %#x timing=%#x\n", drive->name, pio, timing); | |
304 | #endif | |
305 | } | |
306 | ||
307 | /* Can be called directly from ide.c. */ | |
308 | int __init ht6560b_init(void) | |
309 | { | |
310 | ide_hwif_t *hwif, *mate; | |
311 | int t; | |
312 | ||
313 | hwif = &ide_hwifs[0]; | |
314 | mate = &ide_hwifs[1]; | |
315 | ||
316 | if (!request_region(HT_CONFIG_PORT, 1, hwif->name)) { | |
317 | printk(KERN_NOTICE "%s: HT_CONFIG_PORT not found\n", | |
318 | __FUNCTION__); | |
319 | return -ENODEV; | |
320 | } | |
321 | ||
322 | if (!try_to_init_ht6560b()) { | |
323 | printk(KERN_NOTICE "%s: HBA not found\n", __FUNCTION__); | |
324 | goto release_region; | |
325 | } | |
326 | ||
327 | hwif->chipset = ide_ht6560b; | |
328 | hwif->selectproc = &ht6560b_selectproc; | |
329 | hwif->tuneproc = &tune_ht6560b; | |
330 | hwif->serialized = 1; /* is this needed? */ | |
331 | hwif->mate = mate; | |
332 | ||
333 | mate->chipset = ide_ht6560b; | |
334 | mate->selectproc = &ht6560b_selectproc; | |
335 | mate->tuneproc = &tune_ht6560b; | |
336 | mate->serialized = 1; /* is this needed? */ | |
337 | mate->mate = hwif; | |
338 | mate->channel = 1; | |
339 | ||
340 | /* | |
341 | * Setting default configurations for drives | |
342 | */ | |
343 | t = (HT_CONFIG_DEFAULT << 8); | |
344 | t |= HT_TIMING_DEFAULT; | |
345 | hwif->drives[0].drive_data = t; | |
346 | hwif->drives[1].drive_data = t; | |
347 | ||
348 | t |= (HT_SECONDARY_IF << 8); | |
349 | mate->drives[0].drive_data = t; | |
350 | mate->drives[1].drive_data = t; | |
351 | ||
352 | probe_hwif_init(hwif); | |
353 | probe_hwif_init(mate); | |
354 | ||
355 | create_proc_ide_interfaces(); | |
356 | ||
357 | return 0; | |
358 | ||
359 | release_region: | |
360 | release_region(HT_CONFIG_PORT, 1); | |
361 | return -ENODEV; | |
362 | } | |
363 | ||
364 | #ifdef MODULE | |
365 | module_init(ht6560b_init); | |
366 | #endif | |
367 | ||
368 | MODULE_AUTHOR("See Local File"); | |
369 | MODULE_DESCRIPTION("HT-6560B EIDE-controller support"); | |
370 | MODULE_LICENSE("GPL"); |