aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/ide/pci/sl82c105.c
blob: 245eac05ab1bdb3a3ff7ecb5b081d4191a9cf148 (plain) (blame)
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
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
/*
 * linux/drivers/ide/pci/sl82c105.c
 *
 * SL82C105/Winbond 553 IDE driver
 *
 * Maintainer unknown.
 *
 * Drive tuning added from Rebel.com's kernel sources
 *  -- Russell King (15/11/98) linux@arm.linux.org.uk
 * 
 * Merge in Russell's HW workarounds, fix various problems
 * with the timing registers setup.
 *  -- Benjamin Herrenschmidt (01/11/03) benh@kernel.crashing.org
 *
 * Copyright (C) 2006-2007 MontaVista Software, Inc. <source@mvista.com>
 */

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

#include <asm/io.h>
#include <asm/dma.h>

#undef DEBUG

#ifdef DEBUG
#define DBG(arg) printk arg
#else
#define DBG(fmt,...)
#endif
/*
 * SL82C105 PCI config register 0x40 bits.
 */
#define CTRL_IDE_IRQB   (1 << 30)
#define CTRL_IDE_IRQA   (1 << 28)
#define CTRL_LEGIRQ     (1 << 11)
#define CTRL_P1F16      (1 << 5)
#define CTRL_P1EN       (1 << 4)
#define CTRL_P0F16      (1 << 1)
#define CTRL_P0EN       (1 << 0)

/*
 * Convert a PIO mode and cycle time to the required on/off times
 * for the interface.  This has protection against runaway timings.
 */
static unsigned int get_pio_timings(ide_drive_t *drive, u8 pio)
{
	unsigned int cmd_on, cmd_off;
	u8 iordy = 0;

	cmd_on  = (ide_pio_timings[pio].active_time + 29) / 30;
	cmd_off = (ide_pio_cycle_time(drive, pio) - 30 * cmd_on + 29) / 30;

	if (cmd_on == 0)
		cmd_on = 1;

	if (cmd_off == 0)
		cmd_off = 1;

	if (pio > 2 || ide_dev_has_iordy(drive->id))
		iordy = 0x40;

	return (cmd_on - 1) << 8 | (cmd_off - 1) | iordy;
}

/*
 * Configure the chipset for PIO mode.
 */
static void sl82c105_set_pio_mode(ide_drive_t *drive, const u8 pio)
{
	struct pci_dev *dev	= HWIF(drive)->pci_dev;
	int reg			= 0x44 + drive->dn * 4;
	u16 drv_ctrl;

	drv_ctrl = get_pio_timings(drive, pio);

	/*
	 * Store the PIO timings so that we can restore them
	 * in case DMA will be turned off...
	 */
	drive->drive_data &= 0xffff0000;
	drive->drive_data |= drv_ctrl;

	if (!drive->using_dma) {
		/*
		 * If we are actually using MW DMA, then we can not
		 * reprogram the interface drive control register.
		 */
		pci_write_config_word(dev, reg,  drv_ctrl);
		pci_read_config_word (dev, reg, &drv_ctrl);
	}

	printk(KERN_DEBUG "%s: selected %s (%dns) (%04X)\n", drive->name,
			  ide_xfer_verbose(pio + XFER_PIO_0),
			  ide_pio_cycle_time(drive, pio), drv_ctrl);
}

/*
 * Configure the chipset for DMA mode.
 */
static void sl82c105_set_dma_mode(ide_drive_t *drive, const u8 speed)
{
	static u16 mwdma_timings[] = {0x0707, 0x0201, 0x0200};
	u16 drv_ctrl;

 	DBG(("sl82c105_tune_chipset(drive:%s, speed:%s)\n",
	     drive->name, ide_xfer_verbose(speed)));

	switch (speed) {
	case XFER_MW_DMA_2:
	case XFER_MW_DMA_1:
	case XFER_MW_DMA_0:
		drv_ctrl = mwdma_timings[speed - XFER_MW_DMA_0];

		/*
		 * Store the DMA timings so that we can actually program
		 * them when DMA will be turned on...
		 */
		drive->drive_data &= 0x0000ffff;
		drive->drive_data |= (unsigned long)drv_ctrl << 16;

		/*
		 * If we are already using DMA, we just reprogram
		 * the drive control register.
		 */
		if (drive->using_dma) {
			struct pci_dev *dev	= HWIF(drive)->pci_dev;
			int reg 		= 0x44 + drive->dn * 4;

			pci_write_config_word(dev, reg, drv_ctrl);
		}
		break;
	default:
		return;
	}
}

/*
 * Check to see if the drive and chipset are capable of DMA mode.
 */
static int sl82c105_ide_dma_check(ide_drive_t *drive)
{
	DBG(("sl82c105_ide_dma_check(drive:%s)\n", drive->name));

	if (ide_tune_dma(drive))
		return 0;

	ide_set_max_pio(drive);

	return -1;
}

/*
 * The SL82C105 holds off all IDE interrupts while in DMA mode until
 * all DMA activity is completed.  Sometimes this causes problems (eg,
 * when the drive wants to report an error condition).
 *
 * 0x7e is a "chip testing" register.  Bit 2 resets the DMA controller
 * state machine.  We need to kick this to work around various bugs.
 */
static inline void sl82c105_reset_host(struct pci_dev *dev)
{
	u16 val;

	pci_read_config_word(dev, 0x7e, &val);
	pci_write_config_word(dev, 0x7e, val | (1 << 2));
	pci_write_config_word(dev, 0x7e, val & ~(1 << 2));
}

/*
 * If we get an IRQ timeout, it might be that the DMA state machine
 * got confused.  Fix from Todd Inglett.  Details from Winbond.
 *
 * This function is called when the IDE timer expires, the drive
 * indicates that it is READY, and we were waiting for DMA to complete.
 */
static void sl82c105_dma_lost_irq(ide_drive_t *drive)
{
	ide_hwif_t *hwif	= HWIF(drive);
	struct pci_dev *dev	= hwif->pci_dev;
	u32 val, mask		= hwif->channel ? CTRL_IDE_IRQB : CTRL_IDE_IRQA;
	u8 dma_cmd;

	printk("sl82c105: lost IRQ, resetting host\n");

	/*
	 * Check the raw interrupt from the drive.
	 */
	pci_read_config_dword(dev, 0x40, &val);
	if (val & mask)
		printk("sl82c105: drive was requesting IRQ, but host lost it\n");

	/*
	 * Was DMA enabled?  If so, disable it - we're resetting the
	 * host.  The IDE layer will be handling the drive for us.
	 */
	dma_cmd = inb(hwif->dma_command);
	if (dma_cmd & 1) {
		outb(dma_cmd & ~1, hwif->dma_command);
		printk("sl82c105: DMA was enabled\n");
	}

	sl82c105_reset_host(dev);
}

/*
 * ATAPI devices can cause the SL82C105 DMA state machine to go gaga.
 * Winbond recommend that the DMA state machine is reset prior to
 * setting the bus master DMA enable bit.
 *
 * The generic IDE core will have disabled the BMEN bit before this
 * function is called.
 */
static void sl82c105_dma_start(ide_drive_t *drive)
{
	ide_hwif_t *hwif	= HWIF(drive);
	struct pci_dev *dev	= hwif->pci_dev;

	sl82c105_reset_host(dev);
	ide_dma_start(drive);
}

static void sl82c105_dma_timeout(ide_drive_t *drive)
{
	DBG(("sl82c105_dma_timeout(drive:%s)\n", drive->name));

	sl82c105_reset_host(HWIF(drive)->pci_dev);
	ide_dma_timeout(drive);
}

static int sl82c105_ide_dma_on(ide_drive_t *drive)
{
	struct pci_dev *dev	= HWIF(drive)->pci_dev;
	int rc, reg 		= 0x44 + drive->dn * 4;

	DBG(("sl82c105_ide_dma_on(drive:%s)\n", drive->name));

	rc = __ide_dma_on(drive);
	if (rc == 0) {
		pci_write_config_word(dev, reg, drive->drive_data >> 16);

		printk(KERN_INFO "%s: DMA enabled\n", drive->name);
	}
	return rc;
}

static void sl82c105_dma_off_quietly(ide_drive_t *drive)
{
	struct pci_dev *dev	= HWIF(drive)->pci_dev;
	int reg 		= 0x44 + drive->dn * 4;

	DBG(("sl82c105_dma_off_quietly(drive:%s)\n", drive->name));

	pci_write_config_word(dev, reg, drive->drive_data);

	ide_dma_off_quietly(drive);
}

/*
 * Ok, that is nasty, but we must make sure the DMA timings
 * won't be used for a PIO access. The solution here is
 * to make sure the 16 bits mode is diabled on the channel
 * when DMA is enabled, thus causing the chip to use PIO0
 * timings for those operations.
 */
static void sl82c105_selectproc(ide_drive_t *drive)
{
	ide_hwif_t *hwif	= HWIF(drive);
	struct pci_dev *dev	= hwif->pci_dev;
	u32 val, old, mask;

	//DBG(("sl82c105_selectproc(drive:%s)\n", drive->name));

	mask = hwif->channel ? CTRL_P1F16 : CTRL_P0F16;
	old = val = (u32)pci_get_drvdata(dev);
	if (drive->using_dma)
		val &= ~mask;
	else
		val |= mask;
	if (old != val) {
		pci_write_config_dword(dev, 0x40, val);	
		pci_set_drvdata(dev, (void *)val);
	}
}

/*
 * ATA reset will clear the 16 bits mode in the control
 * register, we need to update our cache
 */
static void sl82c105_resetproc(ide_drive_t *drive)
{
	struct pci_dev *dev = HWIF(drive)->pci_dev;
	u32 val;

	DBG(("sl82c105_resetproc(drive:%s)\n", drive->name));

	pci_read_config_dword(dev, 0x40, &val);
	pci_set_drvdata(dev, (void *)val);
}

/*
 * Return the revision of the Winbond bridge
 * which this function is part of.
 */
static unsigned int sl82c105_bridge_revision(struct pci_dev *dev)
{
	struct pci_dev *bridge;

	/*
	 * The bridge should be part of the same device, but function 0.
	 */
	bridge = pci_get_bus_and_slot(dev->bus->number,
			       PCI_DEVFN(PCI_SLOT(dev->devfn), 0));
	if (!bridge)
		return -1;

	/*
	 * Make sure it is a Winbond 553 and is an ISA bridge.
	 */
	if (bridge->vendor != PCI_VENDOR_ID_WINBOND ||
	    bridge->device != PCI_DEVICE_ID_WINBOND_83C553 ||
	    bridge->class >> 8 != PCI_CLASS_BRIDGE_ISA) {
	    	pci_dev_put(bridge);
		return -1;
	}
	/*
	 * We need to find function 0's revision, not function 1
	 */
	pci_dev_put(bridge);

	return bridge->revision;
}

/*
 * Enable the PCI device
 * 
 * --BenH: It's arch fixup code that should enable channels that
 * have not been enabled by firmware. I decided we can still enable
 * channel 0 here at least, but channel 1 has to be enabled by
 * firmware or arch code. We still set both to 16 bits mode.
 */
static unsigned int __devinit init_chipset_sl82c105(struct pci_dev *dev, const char *msg)
{
	u32 val;

	DBG(("init_chipset_sl82c105()\n"));

	pci_read_config_dword(dev, 0x40, &val);
	val |= CTRL_P0EN | CTRL_P0F16 | CTRL_P1F16;
	pci_write_config_dword(dev, 0x40, val);
	pci_set_drvdata(dev, (void *)val);

	return dev->irq;
}

/*
 * Initialise IDE channel
 */
static void __devinit init_hwif_sl82c105(ide_hwif_t *hwif)
{
	unsigned int rev;

	DBG(("init_hwif_sl82c105(hwif: ide%d)\n", hwif->index));

	hwif->set_pio_mode	= &sl82c105_set_pio_mode;
	hwif->set_dma_mode	= &sl82c105_set_dma_mode;
	hwif->selectproc	= &sl82c105_selectproc;
	hwif->resetproc 	= &sl82c105_resetproc;

	/*
	 * We support 32-bit I/O on this interface, and
	 * it doesn't have problems with interrupts.
	 */
	hwif->drives[0].io_32bit = hwif->drives[1].io_32bit = 1;
	hwif->drives[0].unmask   = hwif->drives[1].unmask   = 1;

	/*
	 * We always autotune PIO,  this is done before DMA is checked,
	 * so there's no risk of accidentally disabling DMA
	 */
	hwif->drives[0].autotune = hwif->drives[1].autotune = 1;

	if (!hwif->dma_base)
		return;

	rev = sl82c105_bridge_revision(hwif->pci_dev);
	if (rev <= 5) {
		/*
		 * Never ever EVER under any circumstances enable
		 * DMA when the bridge is this old.
		 */
		printk("    %s: Winbond W83C553 bridge revision %d, "
		       "BM-DMA disabled\n", hwif->name, rev);
		return;
	}

	hwif->atapi_dma  = 1;
	hwif->mwdma_mask = 0x07;

	hwif->ide_dma_check		= &sl82c105_ide_dma_check;
	hwif->ide_dma_on		= &sl82c105_ide_dma_on;
	hwif->dma_off_quietly		= &sl82c105_dma_off_quietly;
	hwif->dma_lost_irq		= &sl82c105_dma_lost_irq;
	hwif->dma_start			= &sl82c105_dma_start;
	hwif->dma_timeout		= &sl82c105_dma_timeout;

	if (!noautodma)
		hwif->autodma = 1;
	hwif->drives[0].autodma = hwif->drives[1].autodma = hwif->autodma;

	if (hwif->mate)
		hwif->serialized = hwif->mate->serialized = 1;
}

static ide_pci_device_t sl82c105_chipset __devinitdata = {
	.name		= "W82C105",
	.init_chipset	= init_chipset_sl82c105,
	.init_hwif	= init_hwif_sl82c105,
	.autodma	= NOAUTODMA,
	.enablebits	= {{0x40,0x01,0x01}, {0x40,0x10,0x10}},
	.bootable	= ON_BOARD,
	.pio_mask	= ATA_PIO5,
};

static int __devinit sl82c105_init_one(struct pci_dev *dev, const struct pci_device_id *id)
{
	return ide_setup_pci_device(dev, &sl82c105_chipset);
}

static struct pci_device_id sl82c105_pci_tbl[] = {
	{ PCI_DEVICE(PCI_VENDOR_ID_WINBOND, PCI_DEVICE_ID_WINBOND_82C105), 0},
	{ 0, },
};
MODULE_DEVICE_TABLE(pci, sl82c105_pci_tbl);

static struct pci_driver driver = {
	.name		= "W82C105_IDE",
	.id_table	= sl82c105_pci_tbl,
	.probe		= sl82c105_init_one,
};

static int __init sl82c105_ide_init(void)
{
	return ide_pci_register_driver(&driver);
}

module_init(sl82c105_ide_init);

MODULE_DESCRIPTION("PCI driver module for W82C105 IDE");
MODULE_LICENSE("GPL");