aboutsummaryrefslogtreecommitdiff
path: root/drivers/ide/legacy/ht6560b.c
blob: 98f7c95e39ed4fd0e9f89244b5cb7a2edbde6e4d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
/*
 *  Copyright (C) 1995-2000  Linus Torvalds & author (see below)
 */

/*
 *  HT-6560B EIDE-controller support
 *  To activate controller support use kernel parameter "ide0=ht6560b".
 *  Use hdparm utility to enable PIO mode support.
 *
 *  Author:    Mikko Ala-Fossi            <maf@iki.fi>
 *             Jan Evert van Grootheest   <j.e.van.grootheest@caiway.nl>
 *
 *  Try:  http://www.maf.iki.fi/~maf/ht6560b/
 */

#define DRV_NAME	"ht6560b"
#define HT6560B_VERSION "v0.08"

#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/timer.h>
#include <linux/mm.h>
#include <linux/ioport.h>
#include <linux/blkdev.h>
#include <linux/hdreg.h>
#include <linux/ide.h>
#include <linux/init.h>

#include <asm/io.h>

/* #define DEBUG */  /* remove comments for DEBUG messages */

/*
 * The special i/o-port that HT-6560B uses to configuration:
 *    bit0 (0x01): "1" selects secondary interface
 *    bit2 (0x04): "1" enables FIFO function
 *    bit5 (0x20): "1" enables prefetched data read function  (???)
 *
 * The special i/o-port that HT-6560A uses to configuration:
 *    bit0 (0x01): "1" selects secondary interface
 *    bit1 (0x02): "1" enables prefetched data read function
 *    bit2 (0x04): "0" enables multi-master system	      (?)
 *    bit3 (0x08): "1" 3 cycle time, "0" 2 cycle time	      (?)
 */
#define HT_CONFIG_PORT	  0x3e6
#define HT_CONFIG(drivea) (u8)(((drivea)->drive_data & 0xff00) >> 8)
/*
 * FIFO + PREFETCH (both a/b-model)
 */
#define HT_CONFIG_DEFAULT 0x1c /* no prefetch */
/* #define HT_CONFIG_DEFAULT 0x3c */ /* with prefetch */
#define HT_SECONDARY_IF	  0x01
#define HT_PREFETCH_MODE  0x20

/*
 * ht6560b Timing values:
 *
 * I reviewed some assembler source listings of htide drivers and found
 * out how they setup those cycle time interfacing values, as they at Holtek
 * call them. IDESETUP.COM that is supplied with the drivers figures out
 * optimal values and fetches those values to drivers. I found out that
 * they use Select register to fetch timings to the ide board right after
 * interface switching. After that it was quite easy to add code to
 * ht6560b.c.
 *
 * IDESETUP.COM gave me values 0x24, 0x45, 0xaa, 0xff that worked fine
 * for hda and hdc. But hdb needed higher values to work, so I guess
 * that sometimes it is necessary to give higher value than IDESETUP
 * gives.   [see cmd640.c for an extreme example of this. -ml]
 *
 * Perhaps I should explain something about these timing values:
 * The higher nibble of value is the Recovery Time  (rt) and the lower nibble
 * of the value is the Active Time  (at). Minimum value 2 is the fastest and
 * the maximum value 15 is the slowest. Default values should be 15 for both.
 * So 0x24 means 2 for rt and 4 for at. Each of the drives should have
 * both values, and IDESETUP gives automatically rt=15 st=15 for CDROMs or
 * similar. If value is too small there will be all sorts of failures.
 *
 * Timing byte consists of
 *	High nibble:  Recovery Cycle Time  (rt)
 *	     The valid values range from 2 to 15. The default is 15.
 *
 *	Low nibble:   Active Cycle Time	   (at)
 *	     The valid values range from 2 to 15. The default is 15.
 *
 * You can obtain optimized timing values by running Holtek IDESETUP.COM
 * for DOS. DOS drivers get their timing values from command line, where
 * the first value is the Recovery Time and the second value is the
 * Active Time for each drive. Smaller value gives higher speed.
 * In case of failures you should probably fall back to a higher value.
 */
#define HT_TIMING(drivea) (u8)((drivea)->drive_data & 0x00ff)
#define HT_TIMING_DEFAULT 0xff

/*
 * This routine handles interface switching for the peculiar hardware design
 * on the F.G.I./Holtek HT-6560B VLB IDE interface.
 * The HT-6560B can only enable one IDE port at a time, and requires a
 * silly sequence (below) whenever we switch between primary and secondary.
 */

/*
 * This routine is invoked from ide.c to prepare for access to a given drive.
 */
static void ht6560b_selectproc (ide_drive_t *drive)
{
	ide_hwif_t *hwif = drive->hwif;
	unsigned long flags;
	static u8 current_select = 0;
	static u8 current_timing = 0;
	u8 select, timing;
	
	local_irq_save(flags);

	select = HT_CONFIG(drive);
	timing = HT_TIMING(drive);

	/*
	 * Need to enforce prefetch sometimes because otherwise
	 * it'll hang (hard).
	 */
	if (drive->media != ide_disk || !drive->present)
		select |= HT_PREFETCH_MODE;

	if (select != current_select || timing != current_timing) {
		current_select = select;
		current_timing = timing;
		(void)inb(HT_CONFIG_PORT);
		(void)inb(HT_CONFIG_PORT);
		(void)inb(HT_CONFIG_PORT);
		(void)inb(HT_CONFIG_PORT);
		outb(select, HT_CONFIG_PORT);
		/*
		 * Set timing for this drive:
		 */
		outb(timing, hwif->io_ports.device_addr);
		(void)inb(hwif->io_ports.status_addr);
#ifdef DEBUG
		printk("ht6560b: %s: select=%#x timing=%#x\n",
			drive->name, select, timing);
#endif
	}
	local_irq_restore(flags);
}

/*
 * Autodetection and initialization of ht6560b
 */
static int __init try_to_init_ht6560b(void)
{
	u8 orig_value;
	int i;
	
	/* Autodetect ht6560b */
	if ((orig_value = inb(HT_CONFIG_PORT)) == 0xff)
		return 0;
	
	for (i=3;i>0;i--) {
		outb(0x00, HT_CONFIG_PORT);
		if (!( (~inb(HT_CONFIG_PORT)) & 0x3f )) {
			outb(orig_value, HT_CONFIG_PORT);
			return 0;
		}
	}
	outb(0x00, HT_CONFIG_PORT);
	if ((~inb(HT_CONFIG_PORT))& 0x3f) {
		outb(orig_value, HT_CONFIG_PORT);
		return 0;
	}
	/*
	 * Ht6560b autodetected
	 */
	outb(HT_CONFIG_DEFAULT, HT_CONFIG_PORT);
	outb(HT_TIMING_DEFAULT, 0x1f6);	/* Select register */
	(void)inb(0x1f7);		/* Status register */

	printk("ht6560b " HT6560B_VERSION
	       ": chipset detected and initialized"
#ifdef DEBUG
	       " with debug enabled"
#endif
	       "\n"
		);
	return 1;
}

static u8 ht_pio2timings(ide_drive_t *drive, const u8 pio)
{
	int active_time, recovery_time;
	int active_cycles, recovery_cycles;
	int bus_speed = ide_vlb_clk ? ide_vlb_clk : 50;

        if (pio) {
		unsigned int cycle_time;
		struct ide_timing *t = ide_timing_find_mode(XFER_PIO_0 + pio);

		cycle_time = ide_pio_cycle_time(drive, pio);

		/*
		 *  Just like opti621.c we try to calculate the
		 *  actual cycle time for recovery and activity
		 *  according system bus speed.
		 */
		active_time = t->active;
		recovery_time = cycle_time - active_time - t->setup;
		/*
		 *  Cycle times should be Vesa bus cycles
		 */
		active_cycles   = (active_time   * bus_speed + 999) / 1000;
		recovery_cycles = (recovery_time * bus_speed + 999) / 1000;
		/*
		 *  Upper and lower limits
		 */
		if (active_cycles   < 2)  active_cycles   = 2;
		if (recovery_cycles < 2)  recovery_cycles = 2;
		if (active_cycles   > 15) active_cycles   = 15;
		if (recovery_cycles > 15) recovery_cycles = 0;  /* 0==16 */
		
#ifdef DEBUG
		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);
#endif
		
		return (u8)((recovery_cycles << 4) | active_cycles);
	} else {
		
#ifdef DEBUG
		printk("ht6560b: drive %s setting pio=0\n", drive->name);
#endif
		
		return HT_TIMING_DEFAULT;    /* default setting */
	}
}

static DEFINE_SPINLOCK(ht6560b_lock);

/*
 *  Enable/Disable so called prefetch mode
 */
static void ht_set_prefetch(ide_drive_t *drive, u8 state)
{
	unsigned long flags;
	int t = HT_PREFETCH_MODE << 8;

	spin_lock_irqsave(&ht6560b_lock, flags);

	/*
	 *  Prefetch mode and unmask irq seems to conflict
	 */
	if (state) {
		drive->drive_data |= t;   /* enable prefetch mode */
		drive->no_unmask = 1;
		drive->unmask = 0;
	} else {
		drive->drive_data &= ~t;  /* disable prefetch mode */
		drive->no_unmask = 0;
	}

	spin_unlock_irqrestore(&ht6560b_lock, flags);

#ifdef DEBUG
	printk("ht6560b: drive %s prefetch mode %sabled\n", drive->name, (state ? "en" : "dis"));
#endif
}

static void ht6560b_set_pio_mode(ide_drive_t *drive, const u8 pio)
{
	unsigned long flags;
	u8 timing;
	
	switch (pio) {
	case 8:         /* set prefetch off */
	case 9:         /* set prefetch on */
		ht_set_prefetch(drive, pio & 1);
		return;
	}

	timing = ht_pio2timings(drive, pio);

	spin_lock_irqsave(&ht6560b_lock, flags);
	drive->drive_data &= 0xff00;
	drive->drive_data |= timing;
	spin_unlock_irqrestore(&ht6560b_lock, flags);

#ifdef DEBUG
	printk("ht6560b: drive %s tuned to pio mode %#x timing=%#x\n", drive->name, pio, timing);
#endif
}

static void __init ht6560b_init_dev(ide_drive_t *drive)
{
	ide_hwif_t *hwif = drive->hwif;
	/* Setting default configurations for drives. */
	int t = (HT_CONFIG_DEFAULT << 8) | HT_TIMING_DEFAULT;

	if (hwif->channel)
		t |= (HT_SECONDARY_IF << 8);

	drive->drive_data = t;
}

static int probe_ht6560b;

module_param_named(probe, probe_ht6560b, bool, 0);
MODULE_PARM_DESC(probe, "probe for HT6560B chipset");

static const struct ide_port_ops ht6560b_port_ops = {
	.init_dev		= ht6560b_init_dev,
	.set_pio_mode		= ht6560b_set_pio_mode,
	.selectproc		= ht6560b_selectproc,
};

static const struct ide_port_info ht6560b_port_info __initdata = {
	.name			= DRV_NAME,
	.chipset		= ide_ht6560b,
	.port_ops		= &ht6560b_port_ops,
	.host_flags		= IDE_HFLAG_SERIALIZE | /* is this needed? */
				  IDE_HFLAG_NO_DMA |
				  IDE_HFLAG_ABUSE_PREFETCH,
	.pio_mask		= ATA_PIO4,
};

static int __init ht6560b_init(void)
{
	if (probe_ht6560b == 0)
		return -ENODEV;

	if (!request_region(HT_CONFIG_PORT, 1, DRV_NAME)) {
		printk(KERN_NOTICE "%s: HT_CONFIG_PORT not found\n",
			__func__);
		return -ENODEV;
	}

	if (!try_to_init_ht6560b()) {
		printk(KERN_NOTICE "%s: HBA not found\n", __func__);
		goto release_region;
	}

	return ide_legacy_device_add(&ht6560b_port_info, 0);

release_region:
	release_region(HT_CONFIG_PORT, 1);
	return -ENODEV;
}

module_init(ht6560b_init);

MODULE_AUTHOR("See Local File");
MODULE_DESCRIPTION("HT-6560B EIDE-controller support");
MODULE_LICENSE("GPL");