2 * linux/drivers/ide/legacy/ht6560b.c Version 0.07 Feb 1, 2000
4 * Copyright (C) 1995-2000 Linus Torvalds & author (see below)
9 * Version 0.01 Initial version hacked out of ide.c
11 * Version 0.02 Added support for PIO modes, auto-tune
13 * Version 0.03 Some cleanups
15 * Version 0.05 PIO mode cycle timings auto-tune using bus-speed
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
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.
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.
31 * Author: Mikko Ala-Fossi <maf@iki.fi>
32 * Jan Evert van Grootheest <janevert@iae.nl>
34 * Try: http://www.maf.iki.fi/~maf/ht6560b/
37 #define HT6560B_VERSION "v0.07"
39 #include <linux/module.h>
40 #include <linux/types.h>
41 #include <linux/kernel.h>
42 #include <linux/delay.h>
43 #include <linux/timer.h>
45 #include <linux/ioport.h>
46 #include <linux/blkdev.h>
47 #include <linux/hdreg.h>
48 #include <linux/ide.h>
49 #include <linux/init.h>
53 /* #define DEBUG */ /* remove comments for DEBUG messages */
56 * The special i/o-port that HT-6560B uses to configuration:
57 * bit0 (0x01): "1" selects secondary interface
58 * bit2 (0x04): "1" enables FIFO function
59 * bit5 (0x20): "1" enables prefetched data read function (???)
61 * The special i/o-port that HT-6560A uses to configuration:
62 * bit0 (0x01): "1" selects secondary interface
63 * bit1 (0x02): "1" enables prefetched data read function
64 * bit2 (0x04): "0" enables multi-master system (?)
65 * bit3 (0x08): "1" 3 cycle time, "0" 2 cycle time (?)
67 #define HT_CONFIG_PORT 0x3e6
68 #define HT_CONFIG(drivea) (u8)(((drivea)->drive_data & 0xff00) >> 8)
70 * FIFO + PREFETCH (both a/b-model)
72 #define HT_CONFIG_DEFAULT 0x1c /* no prefetch */
73 /* #define HT_CONFIG_DEFAULT 0x3c */ /* with prefetch */
74 #define HT_SECONDARY_IF 0x01
75 #define HT_PREFETCH_MODE 0x20
78 * ht6560b Timing values:
80 * I reviewed some assembler source listings of htide drivers and found
81 * out how they setup those cycle time interfacing values, as they at Holtek
82 * call them. IDESETUP.COM that is supplied with the drivers figures out
83 * optimal values and fetches those values to drivers. I found out that
84 * they use IDE_SELECT_REG to fetch timings to the ide board right after
85 * interface switching. After that it was quite easy to add code to
88 * IDESETUP.COM gave me values 0x24, 0x45, 0xaa, 0xff that worked fine
89 * for hda and hdc. But hdb needed higher values to work, so I guess
90 * that sometimes it is necessary to give higher value than IDESETUP
91 * gives. [see cmd640.c for an extreme example of this. -ml]
93 * Perhaps I should explain something about these timing values:
94 * The higher nibble of value is the Recovery Time (rt) and the lower nibble
95 * of the value is the Active Time (at). Minimum value 2 is the fastest and
96 * the maximum value 15 is the slowest. Default values should be 15 for both.
97 * So 0x24 means 2 for rt and 4 for at. Each of the drives should have
98 * both values, and IDESETUP gives automatically rt=15 st=15 for CDROMs or
99 * similar. If value is too small there will be all sorts of failures.
101 * Timing byte consists of
102 * High nibble: Recovery Cycle Time (rt)
103 * The valid values range from 2 to 15. The default is 15.
105 * Low nibble: Active Cycle Time (at)
106 * The valid values range from 2 to 15. The default is 15.
108 * You can obtain optimized timing values by running Holtek IDESETUP.COM
109 * for DOS. DOS drivers get their timing values from command line, where
110 * the first value is the Recovery Time and the second value is the
111 * Active Time for each drive. Smaller value gives higher speed.
112 * In case of failures you should probably fall back to a higher value.
114 #define HT_TIMING(drivea) (u8)((drivea)->drive_data & 0x00ff)
115 #define HT_TIMING_DEFAULT 0xff
118 * This routine handles interface switching for the peculiar hardware design
119 * on the F.G.I./Holtek HT-6560B VLB IDE interface.
120 * The HT-6560B can only enable one IDE port at a time, and requires a
121 * silly sequence (below) whenever we switch between primary and secondary.
125 * This routine is invoked from ide.c to prepare for access to a given drive.
127 static void ht6560b_selectproc (ide_drive_t *drive)
130 static u8 current_select = 0;
131 static u8 current_timing = 0;
134 local_irq_save(flags);
136 select = HT_CONFIG(drive);
137 timing = HT_TIMING(drive);
139 if (select != current_select || timing != current_timing) {
140 current_select = select;
141 current_timing = timing;
142 if (drive->media != ide_disk || !drive->present)
143 select |= HT_PREFETCH_MODE;
144 (void)inb(HT_CONFIG_PORT);
145 (void)inb(HT_CONFIG_PORT);
146 (void)inb(HT_CONFIG_PORT);
147 (void)inb(HT_CONFIG_PORT);
148 outb(select, HT_CONFIG_PORT);
150 * Set timing for this drive:
152 outb(timing, IDE_SELECT_REG);
153 (void)inb(IDE_STATUS_REG);
155 printk("ht6560b: %s: select=%#x timing=%#x\n",
156 drive->name, select, timing);
159 local_irq_restore(flags);
163 * Autodetection and initialization of ht6560b
165 static int __init try_to_init_ht6560b(void)
170 /* Autodetect ht6560b */
171 if ((orig_value = inb(HT_CONFIG_PORT)) == 0xff)
175 outb(0x00, HT_CONFIG_PORT);
176 if (!( (~inb(HT_CONFIG_PORT)) & 0x3f )) {
177 outb(orig_value, HT_CONFIG_PORT);
181 outb(0x00, HT_CONFIG_PORT);
182 if ((~inb(HT_CONFIG_PORT))& 0x3f) {
183 outb(orig_value, HT_CONFIG_PORT);
187 * Ht6560b autodetected
189 outb(HT_CONFIG_DEFAULT, HT_CONFIG_PORT);
190 outb(HT_TIMING_DEFAULT, 0x1f6); /* IDE_SELECT_REG */
191 (void) inb(0x1f7); /* IDE_STATUS_REG */
193 printk("\nht6560b " HT6560B_VERSION
194 ": chipset detected and initialized"
196 " with debug enabled"
202 static u8 ht_pio2timings(ide_drive_t *drive, u8 pio)
204 int active_time, recovery_time;
205 int active_cycles, recovery_cycles;
207 int bus_speed = system_bus_clock();
210 pio = ide_get_best_pio_mode(drive, pio, 5, &d);
213 * Just like opti621.c we try to calculate the
214 * actual cycle time for recovery and activity
215 * according system bus speed.
217 active_time = ide_pio_timings[pio].active_time;
218 recovery_time = d.cycle_time
220 - ide_pio_timings[pio].setup_time;
222 * Cycle times should be Vesa bus cycles
224 active_cycles = (active_time * bus_speed + 999) / 1000;
225 recovery_cycles = (recovery_time * bus_speed + 999) / 1000;
227 * Upper and lower limits
229 if (active_cycles < 2) active_cycles = 2;
230 if (recovery_cycles < 2) recovery_cycles = 2;
231 if (active_cycles > 15) active_cycles = 15;
232 if (recovery_cycles > 15) recovery_cycles = 0; /* 0==16 */
235 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);
238 return (u8)((recovery_cycles << 4) | active_cycles);
242 printk("ht6560b: drive %s setting pio=0\n", drive->name);
245 return HT_TIMING_DEFAULT; /* default setting */
250 * Enable/Disable so called prefetch mode
252 static void ht_set_prefetch(ide_drive_t *drive, u8 state)
255 int t = HT_PREFETCH_MODE << 8;
257 spin_lock_irqsave(&ide_lock, flags);
260 * Prefetch mode and unmask irq seems to conflict
263 drive->drive_data |= t; /* enable prefetch mode */
264 drive->no_unmask = 1;
267 drive->drive_data &= ~t; /* disable prefetch mode */
268 drive->no_unmask = 0;
271 spin_unlock_irqrestore(&ide_lock, flags);
274 printk("ht6560b: drive %s prefetch mode %sabled\n", drive->name, (state ? "en" : "dis"));
278 static void tune_ht6560b (ide_drive_t *drive, u8 pio)
284 case 8: /* set prefetch off */
285 case 9: /* set prefetch on */
286 ht_set_prefetch(drive, pio & 1);
290 timing = ht_pio2timings(drive, pio);
292 spin_lock_irqsave(&ide_lock, flags);
294 drive->drive_data &= 0xff00;
295 drive->drive_data |= timing;
297 spin_unlock_irqrestore(&ide_lock, flags);
300 printk("ht6560b: drive %s tuned to pio mode %#x timing=%#x\n", drive->name, pio, timing);
304 int probe_ht6560b = 0;
306 module_param_named(probe, probe_ht6560b, bool, 0);
307 MODULE_PARM_DESC(probe, "probe for HT6560B chipset");
309 /* Can be called directly from ide.c. */
310 int __init ht6560b_init(void)
312 ide_hwif_t *hwif, *mate;
315 if (probe_ht6560b == 0)
318 hwif = &ide_hwifs[0];
319 mate = &ide_hwifs[1];
321 if (!request_region(HT_CONFIG_PORT, 1, hwif->name)) {
322 printk(KERN_NOTICE "%s: HT_CONFIG_PORT not found\n",
327 if (!try_to_init_ht6560b()) {
328 printk(KERN_NOTICE "%s: HBA not found\n", __FUNCTION__);
332 hwif->chipset = ide_ht6560b;
333 hwif->selectproc = &ht6560b_selectproc;
334 hwif->tuneproc = &tune_ht6560b;
335 hwif->serialized = 1; /* is this needed? */
338 mate->chipset = ide_ht6560b;
339 mate->selectproc = &ht6560b_selectproc;
340 mate->tuneproc = &tune_ht6560b;
341 mate->serialized = 1; /* is this needed? */
346 * Setting default configurations for drives
348 t = (HT_CONFIG_DEFAULT << 8);
349 t |= HT_TIMING_DEFAULT;
350 hwif->drives[0].drive_data = t;
351 hwif->drives[1].drive_data = t;
353 t |= (HT_SECONDARY_IF << 8);
354 mate->drives[0].drive_data = t;
355 mate->drives[1].drive_data = t;
357 probe_hwif_init(hwif);
358 probe_hwif_init(mate);
360 ide_proc_register_port(hwif);
361 ide_proc_register_port(mate);
366 release_region(HT_CONFIG_PORT, 1);
371 module_init(ht6560b_init);
374 MODULE_AUTHOR("See Local File");
375 MODULE_DESCRIPTION("HT-6560B EIDE-controller support");
376 MODULE_LICENSE("GPL");