summaryrefslogtreecommitdiff
path: root/arch/mips/sgi-ip22/ip22-gio.c
blob: 282b47c2dc2707b5ed2f173f946d6c4f742fc145 (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
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
// SPDX-License-Identifier: GPL-2.0-only
#include <linux/export.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/slab.h>

#include <asm/addrspace.h>
#include <asm/paccess.h>
#include <asm/gio_device.h>
#include <asm/sgi/gio.h>
#include <asm/sgi/hpc3.h>
#include <asm/sgi/mc.h>
#include <asm/sgi/ip22.h>

static struct bus_type gio_bus_type;

static struct {
	const char *name;
	__u8	   id;
} gio_name_table[] = {
	{ .name = "SGI Impact", .id = 0x10 },
	{ .name = "Phobos G160", .id = 0x35 },
	{ .name = "Phobos G130", .id = 0x36 },
	{ .name = "Phobos G100", .id = 0x37 },
	{ .name = "Set Engineering GFE", .id = 0x38 },
	/* fake IDs */
	{ .name = "SGI Newport", .id = 0x7e },
	{ .name = "SGI GR2/GR3", .id = 0x7f },
};

static void gio_bus_release(struct device *dev)
{
	kfree(dev);
}

static struct device gio_bus = {
	.init_name = "gio",
	.release = &gio_bus_release,
};

/**
 * gio_match_device - Tell if an of_device structure has a matching
 * gio_match structure
 * @ids: array of of device match structures to search in
 * @dev: the of device structure to match against
 *
 * Used by a driver to check whether an of_device present in the
 * system is in its list of supported devices.
 */
const struct gio_device_id *gio_match_device(const struct gio_device_id *match,
		     const struct gio_device *dev)
{
	const struct gio_device_id *ids;

	for (ids = match; ids->id != 0xff; ids++)
		if (ids->id == dev->id.id)
			return ids;

	return NULL;
}
EXPORT_SYMBOL_GPL(gio_match_device);

struct gio_device *gio_dev_get(struct gio_device *dev)
{
	struct device *tmp;

	if (!dev)
		return NULL;
	tmp = get_device(&dev->dev);
	if (tmp)
		return to_gio_device(tmp);
	else
		return NULL;
}
EXPORT_SYMBOL_GPL(gio_dev_get);

void gio_dev_put(struct gio_device *dev)
{
	if (dev)
		put_device(&dev->dev);
}
EXPORT_SYMBOL_GPL(gio_dev_put);

/**
 * gio_release_dev - free an gio device structure when all users of it are finished.
 * @dev: device that's been disconnected
 *
 * Will be called only by the device core when all users of this gio device are
 * done.
 */
void gio_release_dev(struct device *dev)
{
	struct gio_device *giodev;

	giodev = to_gio_device(dev);
	kfree(giodev);
}
EXPORT_SYMBOL_GPL(gio_release_dev);

int gio_device_register(struct gio_device *giodev)
{
	giodev->dev.bus = &gio_bus_type;
	giodev->dev.parent = &gio_bus;
	return device_register(&giodev->dev);
}
EXPORT_SYMBOL_GPL(gio_device_register);

void gio_device_unregister(struct gio_device *giodev)
{
	device_unregister(&giodev->dev);
}
EXPORT_SYMBOL_GPL(gio_device_unregister);

static int gio_bus_match(struct device *dev, struct device_driver *drv)
{
	struct gio_device *gio_dev = to_gio_device(dev);
	struct gio_driver *gio_drv = to_gio_driver(drv);

	return gio_match_device(gio_drv->id_table, gio_dev) != NULL;
}

static int gio_device_probe(struct device *dev)
{
	int error = -ENODEV;
	struct gio_driver *drv;
	struct gio_device *gio_dev;
	const struct gio_device_id *match;

	drv = to_gio_driver(dev->driver);
	gio_dev = to_gio_device(dev);

	if (!drv->probe)
		return error;

	gio_dev_get(gio_dev);

	match = gio_match_device(drv->id_table, gio_dev);
	if (match)
		error = drv->probe(gio_dev, match);
	if (error)
		gio_dev_put(gio_dev);

	return error;
}

static int gio_device_remove(struct device *dev)
{
	struct gio_device *gio_dev = to_gio_device(dev);
	struct gio_driver *drv = to_gio_driver(dev->driver);

	if (dev->driver && drv->remove)
		drv->remove(gio_dev);
	return 0;
}

static void gio_device_shutdown(struct device *dev)
{
	struct gio_device *gio_dev = to_gio_device(dev);
	struct gio_driver *drv = to_gio_driver(dev->driver);

	if (dev->driver && drv->shutdown)
		drv->shutdown(gio_dev);
}

static ssize_t modalias_show(struct device *dev, struct device_attribute *a,
			     char *buf)
{
	struct gio_device *gio_dev = to_gio_device(dev);
	int len = snprintf(buf, PAGE_SIZE, "gio:%x\n", gio_dev->id.id);

	return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len;
}
static DEVICE_ATTR_RO(modalias);

static ssize_t name_show(struct device *dev,
			 struct device_attribute *attr, char *buf)
{
	struct gio_device *giodev;

	giodev = to_gio_device(dev);
	return sprintf(buf, "%s", giodev->name);
}
static DEVICE_ATTR_RO(name);

static ssize_t id_show(struct device *dev,
		       struct device_attribute *attr, char *buf)
{
	struct gio_device *giodev;

	giodev = to_gio_device(dev);
	return sprintf(buf, "%x", giodev->id.id);
}
static DEVICE_ATTR_RO(id);

static struct attribute *gio_dev_attrs[] = {
	&dev_attr_modalias.attr,
	&dev_attr_name.attr,
	&dev_attr_id.attr,
	NULL,
};
ATTRIBUTE_GROUPS(gio_dev);

static int gio_device_uevent(struct device *dev, struct kobj_uevent_env *env)
{
	struct gio_device *gio_dev = to_gio_device(dev);

	add_uevent_var(env, "MODALIAS=gio:%x", gio_dev->id.id);
	return 0;
}

int gio_register_driver(struct gio_driver *drv)
{
	/* initialize common driver fields */
	if (!drv->driver.name)
		drv->driver.name = drv->name;
	if (!drv->driver.owner)
		drv->driver.owner = drv->owner;
	drv->driver.bus = &gio_bus_type;

	/* register with core */
	return driver_register(&drv->driver);
}
EXPORT_SYMBOL_GPL(gio_register_driver);

void gio_unregister_driver(struct gio_driver *drv)
{
	driver_unregister(&drv->driver);
}
EXPORT_SYMBOL_GPL(gio_unregister_driver);

void gio_set_master(struct gio_device *dev)
{
	u32 tmp = sgimc->giopar;

	switch (dev->slotno) {
	case 0:
		tmp |= SGIMC_GIOPAR_MASTERGFX;
		break;
	case 1:
		tmp |= SGIMC_GIOPAR_MASTEREXP0;
		break;
	case 2:
		tmp |= SGIMC_GIOPAR_MASTEREXP1;
		break;
	}
	sgimc->giopar = tmp;
}
EXPORT_SYMBOL_GPL(gio_set_master);

void ip22_gio_set_64bit(int slotno)
{
	u32 tmp = sgimc->giopar;

	switch (slotno) {
	case 0:
		tmp |= SGIMC_GIOPAR_GFX64;
		break;
	case 1:
		tmp |= SGIMC_GIOPAR_EXP064;
		break;
	case 2:
		tmp |= SGIMC_GIOPAR_EXP164;
		break;
	}
	sgimc->giopar = tmp;
}

static int ip22_gio_id(unsigned long addr, u32 *res)
{
	u8 tmp8;
	u8 tmp16;
	u32 tmp32;
	u8 *ptr8;
	u16 *ptr16;
	u32 *ptr32;

	ptr32 = (void *)CKSEG1ADDR(addr);
	if (!get_dbe(tmp32, ptr32)) {
		/*
		 * We got no DBE, but this doesn't mean anything.
		 * If GIO is pipelined (which can't be disabled
		 * for GFX slot) we don't get a DBE, but we see
		 * the transfer size as data. So we do an 8bit
		 * and a 16bit access and check whether the common
		 * data matches
		 */
		ptr8 = (void *)CKSEG1ADDR(addr + 3);
		if (get_dbe(tmp8, ptr8)) {
			/*
			 * 32bit access worked, but 8bit doesn't
			 * so we don't see phantom reads on
			 * a pipelined bus, but a real card which
			 * doesn't support 8 bit reads
			 */
			*res = tmp32;
			return 1;
		}
		ptr16 = (void *)CKSEG1ADDR(addr + 2);
		get_dbe(tmp16, ptr16);
		if (tmp8 == (tmp16 & 0xff) &&
		    tmp8 == (tmp32 & 0xff) &&
		    tmp16 == (tmp32 & 0xffff)) {
			*res = tmp32;
			return 1;
		}
	}
	return 0; /* nothing here */
}

#define HQ2_MYSTERY_OFFS       0x6A07C
#define NEWPORT_USTATUS_OFFS   0xF133C

static int ip22_is_gr2(unsigned long addr)
{
	u32 tmp;
	u32 *ptr;

	/* HQ2 only allows 32bit accesses */
	ptr = (void *)CKSEG1ADDR(addr + HQ2_MYSTERY_OFFS);
	if (!get_dbe(tmp, ptr)) {
		if (tmp == 0xdeadbeef)
			return 1;
	}
	return 0;
}


static void ip22_check_gio(int slotno, unsigned long addr, int irq)
{
	const char *name = "Unknown";
	struct gio_device *gio_dev;
	u32 tmp;
	__u8 id;
	int i;

	/* first look for GR2/GR3 by checking mystery register */
	if (ip22_is_gr2(addr))
		tmp = 0x7f;
	else {
		if (!ip22_gio_id(addr, &tmp)) {
			/*
			 * no GIO signature at start address of slot
			 * since Newport doesn't have one, we check if
			 * user status register is readable
			 */
			if (ip22_gio_id(addr + NEWPORT_USTATUS_OFFS, &tmp))
				tmp = 0x7e;
			else
				tmp = 0;
		}
	}
	if (tmp) {
		id = GIO_ID(tmp);
		if (tmp & GIO_32BIT_ID) {
			if (tmp & GIO_64BIT_IFACE)
				ip22_gio_set_64bit(slotno);
		}
		for (i = 0; i < ARRAY_SIZE(gio_name_table); i++) {
			if (id == gio_name_table[i].id) {
				name = gio_name_table[i].name;
				break;
			}
		}
		printk(KERN_INFO "GIO: slot %d : %s (id %x)\n",
		       slotno, name, id);
		gio_dev = kzalloc(sizeof *gio_dev, GFP_KERNEL);
		gio_dev->name = name;
		gio_dev->slotno = slotno;
		gio_dev->id.id = id;
		gio_dev->resource.start = addr;
		gio_dev->resource.end = addr + 0x3fffff;
		gio_dev->resource.flags = IORESOURCE_MEM;
		gio_dev->irq = irq;
		dev_set_name(&gio_dev->dev, "%d", slotno);
		gio_device_register(gio_dev);
	} else
		printk(KERN_INFO "GIO: slot %d : Empty\n", slotno);
}

static struct bus_type gio_bus_type = {
	.name	   = "gio",
	.dev_groups = gio_dev_groups,
	.match	   = gio_bus_match,
	.probe	   = gio_device_probe,
	.remove	   = gio_device_remove,
	.shutdown  = gio_device_shutdown,
	.uevent	   = gio_device_uevent,
};

static struct resource gio_bus_resource = {
	.start = GIO_SLOT_GFX_BASE,
	.end   = GIO_SLOT_GFX_BASE + 0x9fffff,
	.name  = "GIO Bus",
	.flags = IORESOURCE_MEM,
};

int __init ip22_gio_init(void)
{
	unsigned int pbdma __maybe_unused;
	int ret;

	ret = device_register(&gio_bus);
	if (ret) {
		put_device(&gio_bus);
		return ret;
	}

	ret = bus_register(&gio_bus_type);
	if (!ret) {
		request_resource(&iomem_resource, &gio_bus_resource);
		printk(KERN_INFO "GIO: Probing bus...\n");

		if (ip22_is_fullhouse()) {
			/* Indigo2 */
			ip22_check_gio(0, GIO_SLOT_GFX_BASE, SGI_GIO_1_IRQ);
			ip22_check_gio(1, GIO_SLOT_EXP0_BASE, SGI_GIO_1_IRQ);
		} else {
			/* Indy/Challenge S */
			if (get_dbe(pbdma, (unsigned int *)&hpc3c1->pbdma[1]))
				ip22_check_gio(0, GIO_SLOT_GFX_BASE,
					       SGI_GIO_0_IRQ);
			ip22_check_gio(1, GIO_SLOT_EXP0_BASE, SGI_GIOEXP0_IRQ);
			ip22_check_gio(2, GIO_SLOT_EXP1_BASE, SGI_GIOEXP1_IRQ);
		}
	} else
		device_unregister(&gio_bus);

	return ret;
}

subsys_initcall(ip22_gio_init);