2 * Copyright (C) 1995-2000 Linus Torvalds & author (see below)
6 * HT-6560B EIDE-controller support
7 * To activate controller support use kernel parameter "ide0=ht6560b".
8 * Use hdparm utility to enable PIO mode support.
10 * Author: Mikko Ala-Fossi <maf@iki.fi>
11 * Jan Evert van Grootheest <j.e.van.grootheest@caiway.nl>
13 * Try: http://www.maf.iki.fi/~maf/ht6560b/
16 #define DRV_NAME "ht6560b"
17 #define HT6560B_VERSION "v0.08"
19 #include <linux/module.h>
20 #include <linux/types.h>
21 #include <linux/kernel.h>
22 #include <linux/delay.h>
23 #include <linux/timer.h>
25 #include <linux/ioport.h>
26 #include <linux/blkdev.h>
27 #include <linux/ide.h>
28 #include <linux/init.h>
32 /* #define DEBUG */ /* remove comments for DEBUG messages */
35 * The special i/o-port that HT-6560B uses to configuration:
36 * bit0 (0x01): "1" selects secondary interface
37 * bit2 (0x04): "1" enables FIFO function
38 * bit5 (0x20): "1" enables prefetched data read function (???)
40 * The special i/o-port that HT-6560A uses to configuration:
41 * bit0 (0x01): "1" selects secondary interface
42 * bit1 (0x02): "1" enables prefetched data read function
43 * bit2 (0x04): "0" enables multi-master system (?)
44 * bit3 (0x08): "1" 3 cycle time, "0" 2 cycle time (?)
46 #define HT_CONFIG_PORT 0x3e6
47 #define HT_CONFIG(drivea) (u8)(((drivea)->drive_data & 0xff00) >> 8)
49 * FIFO + PREFETCH (both a/b-model)
51 #define HT_CONFIG_DEFAULT 0x1c /* no prefetch */
52 /* #define HT_CONFIG_DEFAULT 0x3c */ /* with prefetch */
53 #define HT_SECONDARY_IF 0x01
54 #define HT_PREFETCH_MODE 0x20
57 * ht6560b Timing values:
59 * I reviewed some assembler source listings of htide drivers and found
60 * out how they setup those cycle time interfacing values, as they at Holtek
61 * call them. IDESETUP.COM that is supplied with the drivers figures out
62 * optimal values and fetches those values to drivers. I found out that
63 * they use Select register to fetch timings to the ide board right after
64 * interface switching. After that it was quite easy to add code to
67 * IDESETUP.COM gave me values 0x24, 0x45, 0xaa, 0xff that worked fine
68 * for hda and hdc. But hdb needed higher values to work, so I guess
69 * that sometimes it is necessary to give higher value than IDESETUP
70 * gives. [see cmd640.c for an extreme example of this. -ml]
72 * Perhaps I should explain something about these timing values:
73 * The higher nibble of value is the Recovery Time (rt) and the lower nibble
74 * of the value is the Active Time (at). Minimum value 2 is the fastest and
75 * the maximum value 15 is the slowest. Default values should be 15 for both.
76 * So 0x24 means 2 for rt and 4 for at. Each of the drives should have
77 * both values, and IDESETUP gives automatically rt=15 st=15 for CDROMs or
78 * similar. If value is too small there will be all sorts of failures.
80 * Timing byte consists of
81 * High nibble: Recovery Cycle Time (rt)
82 * The valid values range from 2 to 15. The default is 15.
84 * Low nibble: Active Cycle Time (at)
85 * The valid values range from 2 to 15. The default is 15.
87 * You can obtain optimized timing values by running Holtek IDESETUP.COM
88 * for DOS. DOS drivers get their timing values from command line, where
89 * the first value is the Recovery Time and the second value is the
90 * Active Time for each drive. Smaller value gives higher speed.
91 * In case of failures you should probably fall back to a higher value.
93 #define HT_TIMING(drivea) (u8)((drivea)->drive_data & 0x00ff)
94 #define HT_TIMING_DEFAULT 0xff
97 * This routine handles interface switching for the peculiar hardware design
98 * on the F.G.I./Holtek HT-6560B VLB IDE interface.
99 * The HT-6560B can only enable one IDE port at a time, and requires a
100 * silly sequence (below) whenever we switch between primary and secondary.
104 * This routine is invoked from ide.c to prepare for access to a given drive.
106 static void ht6560b_selectproc (ide_drive_t *drive)
108 ide_hwif_t *hwif = drive->hwif;
110 static u8 current_select = 0;
111 static u8 current_timing = 0;
114 local_irq_save(flags);
116 select = HT_CONFIG(drive);
117 timing = HT_TIMING(drive);
120 * Need to enforce prefetch sometimes because otherwise
123 if (drive->media != ide_disk ||
124 (drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
125 select |= HT_PREFETCH_MODE;
127 if (select != current_select || timing != current_timing) {
128 current_select = select;
129 current_timing = timing;
130 (void)inb(HT_CONFIG_PORT);
131 (void)inb(HT_CONFIG_PORT);
132 (void)inb(HT_CONFIG_PORT);
133 (void)inb(HT_CONFIG_PORT);
134 outb(select, HT_CONFIG_PORT);
136 * Set timing for this drive:
138 outb(timing, hwif->io_ports.device_addr);
139 (void)inb(hwif->io_ports.status_addr);
141 printk("ht6560b: %s: select=%#x timing=%#x\n",
142 drive->name, select, timing);
145 local_irq_restore(flags);
149 * Autodetection and initialization of ht6560b
151 static int __init try_to_init_ht6560b(void)
156 /* Autodetect ht6560b */
157 if ((orig_value = inb(HT_CONFIG_PORT)) == 0xff)
161 outb(0x00, HT_CONFIG_PORT);
162 if (!( (~inb(HT_CONFIG_PORT)) & 0x3f )) {
163 outb(orig_value, HT_CONFIG_PORT);
167 outb(0x00, HT_CONFIG_PORT);
168 if ((~inb(HT_CONFIG_PORT))& 0x3f) {
169 outb(orig_value, HT_CONFIG_PORT);
173 * Ht6560b autodetected
175 outb(HT_CONFIG_DEFAULT, HT_CONFIG_PORT);
176 outb(HT_TIMING_DEFAULT, 0x1f6); /* Select register */
177 (void)inb(0x1f7); /* Status register */
179 printk("ht6560b " HT6560B_VERSION
180 ": chipset detected and initialized"
182 " with debug enabled"
189 static u8 ht_pio2timings(ide_drive_t *drive, const u8 pio)
191 int active_time, recovery_time;
192 int active_cycles, recovery_cycles;
193 int bus_speed = ide_vlb_clk ? ide_vlb_clk : 50;
196 unsigned int cycle_time;
197 struct ide_timing *t = ide_timing_find_mode(XFER_PIO_0 + pio);
199 cycle_time = ide_pio_cycle_time(drive, pio);
202 * Just like opti621.c we try to calculate the
203 * actual cycle time for recovery and activity
204 * according system bus speed.
206 active_time = t->active;
207 recovery_time = cycle_time - active_time - t->setup;
209 * Cycle times should be Vesa bus cycles
211 active_cycles = (active_time * bus_speed + 999) / 1000;
212 recovery_cycles = (recovery_time * bus_speed + 999) / 1000;
214 * Upper and lower limits
216 if (active_cycles < 2) active_cycles = 2;
217 if (recovery_cycles < 2) recovery_cycles = 2;
218 if (active_cycles > 15) active_cycles = 15;
219 if (recovery_cycles > 15) recovery_cycles = 0; /* 0==16 */
222 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);
225 return (u8)((recovery_cycles << 4) | active_cycles);
229 printk("ht6560b: drive %s setting pio=0\n", drive->name);
232 return HT_TIMING_DEFAULT; /* default setting */
236 static DEFINE_SPINLOCK(ht6560b_lock);
239 * Enable/Disable so called prefetch mode
241 static void ht_set_prefetch(ide_drive_t *drive, u8 state)
244 int t = HT_PREFETCH_MODE << 8;
246 spin_lock_irqsave(&ht6560b_lock, flags);
249 * Prefetch mode and unmask irq seems to conflict
252 drive->drive_data |= t; /* enable prefetch mode */
253 drive->dev_flags |= IDE_DFLAG_NO_UNMASK;
254 drive->dev_flags &= ~IDE_DFLAG_UNMASK;
256 drive->drive_data &= ~t; /* disable prefetch mode */
257 drive->dev_flags &= ~IDE_DFLAG_NO_UNMASK;
260 spin_unlock_irqrestore(&ht6560b_lock, flags);
263 printk("ht6560b: drive %s prefetch mode %sabled\n", drive->name, (state ? "en" : "dis"));
267 static void ht6560b_set_pio_mode(ide_drive_t *drive, const u8 pio)
273 case 8: /* set prefetch off */
274 case 9: /* set prefetch on */
275 ht_set_prefetch(drive, pio & 1);
279 timing = ht_pio2timings(drive, pio);
281 spin_lock_irqsave(&ht6560b_lock, flags);
282 drive->drive_data &= 0xff00;
283 drive->drive_data |= timing;
284 spin_unlock_irqrestore(&ht6560b_lock, flags);
287 printk("ht6560b: drive %s tuned to pio mode %#x timing=%#x\n", drive->name, pio, timing);
291 static void __init ht6560b_init_dev(ide_drive_t *drive)
293 ide_hwif_t *hwif = drive->hwif;
294 /* Setting default configurations for drives. */
295 int t = (HT_CONFIG_DEFAULT << 8) | HT_TIMING_DEFAULT;
298 t |= (HT_SECONDARY_IF << 8);
300 drive->drive_data = t;
303 static int probe_ht6560b;
305 module_param_named(probe, probe_ht6560b, bool, 0);
306 MODULE_PARM_DESC(probe, "probe for HT6560B chipset");
308 static const struct ide_port_ops ht6560b_port_ops = {
309 .init_dev = ht6560b_init_dev,
310 .set_pio_mode = ht6560b_set_pio_mode,
311 .selectproc = ht6560b_selectproc,
314 static const struct ide_port_info ht6560b_port_info __initdata = {
316 .chipset = ide_ht6560b,
317 .port_ops = &ht6560b_port_ops,
318 .host_flags = IDE_HFLAG_SERIALIZE | /* is this needed? */
320 IDE_HFLAG_ABUSE_PREFETCH,
321 .pio_mask = ATA_PIO4,
324 static int __init ht6560b_init(void)
326 if (probe_ht6560b == 0)
329 if (!request_region(HT_CONFIG_PORT, 1, DRV_NAME)) {
330 printk(KERN_NOTICE "%s: HT_CONFIG_PORT not found\n",
335 if (!try_to_init_ht6560b()) {
336 printk(KERN_NOTICE "%s: HBA not found\n", __func__);
340 return ide_legacy_device_add(&ht6560b_port_info, 0);
343 release_region(HT_CONFIG_PORT, 1);
347 module_init(ht6560b_init);
349 MODULE_AUTHOR("See Local File");
350 MODULE_DESCRIPTION("HT-6560B EIDE-controller support");
351 MODULE_LICENSE("GPL");