aboutsummaryrefslogtreecommitdiffstats
path: root/arch/ppc/syslib/ocp.c
blob: 2fe28ded2c6096080be6bd0665135466dfc1e089 (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
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
/*
 * ocp.c
 *
 *      (c) Benjamin Herrenschmidt (benh@kernel.crashing.org)
 *          Mipsys - France
 *
 *          Derived from work (c) Armin Kuster akuster@pacbell.net
 *
 *          Additional support and port to 2.6 LDM/sysfs by
 *          Matt Porter <mporter@kernel.crashing.org>
 *          Copyright 2004 MontaVista Software, Inc.
 *
 *  This program is free software; you can redistribute  it and/or modify it
 *  under  the terms of  the GNU General Public License as published by the
 *  Free Software Foundation;  either version 2 of the  License, or (at your
 *  option) any later version.
 *
 *  OCP (On Chip Peripheral) is a software emulated "bus" with a
 *  pseudo discovery method for dumb peripherals. Usually these type
 *  of peripherals are found on embedded SoC (System On a Chip)
 *  processors or highly integrated system controllers that have
 *  a host bridge and many peripherals.  Common examples where
 *  this is already used include the PPC4xx, PPC85xx, MPC52xx,
 *  and MV64xxx parts.
 *
 *  This subsystem creates a standard OCP bus type within the
 *  device model.  The devices on the OCP bus are seeded by an
 *  an initial OCP device array created by the arch-specific
 *  Device entries can be added/removed/modified through OCP
 *  helper functions to accomodate system and  board-specific
 *  parameters commonly found in embedded systems. OCP also
 *  provides a standard method for devices to describe extended
 *  attributes about themselves to the system.  A standard access
 *  method allows OCP drivers to obtain the information, both
 *  SoC-specific and system/board-specific, needed for operation.
 */

#include <linux/module.h>
#include <linux/config.h>
#include <linux/list.h>
#include <linux/miscdevice.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/pm.h>
#include <linux/bootmem.h>
#include <linux/device.h>

#include <asm/io.h>
#include <asm/ocp.h>
#include <asm/errno.h>
#include <asm/rwsem.h>
#include <asm/semaphore.h>

//#define DBG(x)	printk x
#define DBG(x)

extern int mem_init_done;

extern struct ocp_def core_ocp[];	/* Static list of devices, provided by
					   CPU core */

LIST_HEAD(ocp_devices);			/* List of all OCP devices */
DECLARE_RWSEM(ocp_devices_sem);		/* Global semaphores for those lists */

static int ocp_inited;

/* Sysfs support */
#define OCP_DEF_ATTR(field, format_string)				\
static ssize_t								\
show_##field(struct device *dev, struct device_attribute *attr, char *buf)				\
{									\
	struct ocp_device *odev = to_ocp_dev(dev);			\
									\
	return sprintf(buf, format_string, odev->def->field);		\
}									\
static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);

OCP_DEF_ATTR(vendor, "0x%04x\n");
OCP_DEF_ATTR(function, "0x%04x\n");
OCP_DEF_ATTR(index, "0x%04x\n");
#ifdef CONFIG_PTE_64BIT
OCP_DEF_ATTR(paddr, "0x%016Lx\n");
#else
OCP_DEF_ATTR(paddr, "0x%08lx\n");
#endif
OCP_DEF_ATTR(irq, "%d\n");
OCP_DEF_ATTR(pm, "%lu\n");

void ocp_create_sysfs_dev_files(struct ocp_device *odev)
{
	struct device *dev = &odev->dev;

	/* Current OCP device def attributes */
	device_create_file(dev, &dev_attr_vendor);
	device_create_file(dev, &dev_attr_function);
	device_create_file(dev, &dev_attr_index);
	device_create_file(dev, &dev_attr_paddr);
	device_create_file(dev, &dev_attr_irq);
	device_create_file(dev, &dev_attr_pm);
	/* Current OCP device additions attributes */
	if (odev->def->additions && odev->def->show)
		odev->def->show(dev);
}

/**
 *	ocp_device_match	-	Match one driver to one device
 *	@drv: driver to match
 *	@dev: device to match
 *
 *	This function returns 0 if the driver and device don't match
 */
static int
ocp_device_match(struct device *dev, struct device_driver *drv)
{
	struct ocp_device *ocp_dev = to_ocp_dev(dev);
	struct ocp_driver *ocp_drv = to_ocp_drv(drv);
	const struct ocp_device_id *ids = ocp_drv->id_table;

	if (!ids)
		return 0;

	while (ids->vendor || ids->function) {
		if ((ids->vendor == OCP_ANY_ID
		     || ids->vendor == ocp_dev->def->vendor)
		    && (ids->function == OCP_ANY_ID
			|| ids->function == ocp_dev->def->function))
		        return 1;
		ids++;
	}
	return 0;
}

static int
ocp_device_probe(struct device *dev)
{
	int error = 0;
	struct ocp_driver *drv;
	struct ocp_device *ocp_dev;

	drv = to_ocp_drv(dev->driver);
	ocp_dev = to_ocp_dev(dev);

	if (drv->probe) {
		error = drv->probe(ocp_dev);
		if (error >= 0) {
			ocp_dev->driver = drv;
			error = 0;
		}
	}
	return error;
}

static int
ocp_device_remove(struct device *dev)
{
	struct ocp_device *ocp_dev = to_ocp_dev(dev);

	if (ocp_dev->driver) {
		if (ocp_dev->driver->remove)
			ocp_dev->driver->remove(ocp_dev);
		ocp_dev->driver = NULL;
	}
	return 0;
}

static int
ocp_device_suspend(struct device *dev, pm_message_t state)
{
	struct ocp_device *ocp_dev = to_ocp_dev(dev);
	struct ocp_driver *ocp_drv = to_ocp_drv(dev->driver);

	if (dev->driver && ocp_drv->suspend)
		return ocp_drv->suspend(ocp_dev, state);
	return 0;
}

static int
ocp_device_resume(struct device *dev)
{
	struct ocp_device *ocp_dev = to_ocp_dev(dev);
	struct ocp_driver *ocp_drv = to_ocp_drv(dev->driver);

	if (dev->driver && ocp_drv->resume)
		return ocp_drv->resume(ocp_dev);
	return 0;
}

struct bus_type ocp_bus_type = {
	.name = "ocp",
	.match = ocp_device_match,
	.probe = ocp_device_probe,
	.remove = ocp_device_remove,
	.suspend = ocp_device_suspend,
	.resume = ocp_device_resume,
};

/**
 *	ocp_register_driver	-	Register an OCP driver
 *	@drv: pointer to statically defined ocp_driver structure
 *
 *	The driver's probe() callback is called either recursively
 *	by this function or upon later call of ocp_driver_init
 *
 *	NOTE: Detection of devices is a 2 pass step on this implementation,
 *	hotswap isn't supported. First, all OCP devices are put in the device
 *	list, _then_ all drivers are probed on each match.
 */
int
ocp_register_driver(struct ocp_driver *drv)
{
	/* initialize common driver fields */
	drv->driver.name = drv->name;
	drv->driver.bus = &ocp_bus_type;

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

/**
 *	ocp_unregister_driver	-	Unregister an OCP driver
 *	@drv: pointer to statically defined ocp_driver structure
 *
 *	The driver's remove() callback is called recursively
 *	by this function for any device already registered
 */
void
ocp_unregister_driver(struct ocp_driver *drv)
{
	DBG(("ocp: ocp_unregister_driver(%s)...\n", drv->name));

	driver_unregister(&drv->driver);

	DBG(("ocp: ocp_unregister_driver(%s)... done.\n", drv->name));
}

/* Core of ocp_find_device(). Caller must hold ocp_devices_sem */
static struct ocp_device *
__ocp_find_device(unsigned int vendor, unsigned int function, int index)
{
	struct list_head	*entry;
	struct ocp_device	*dev, *found = NULL;

	DBG(("ocp: __ocp_find_device(vendor: %x, function: %x, index: %d)...\n", vendor, function, index));

	list_for_each(entry, &ocp_devices) {
		dev = list_entry(entry, struct ocp_device, link);
		if (vendor != OCP_ANY_ID && vendor != dev->def->vendor)
			continue;
		if (function != OCP_ANY_ID && function != dev->def->function)
			continue;
		if (index != OCP_ANY_INDEX && index != dev->def->index)
			continue;
		found = dev;
		break;
	}

	DBG(("ocp: __ocp_find_device(vendor: %x, function: %x, index: %d)... done\n", vendor, function, index));

	return found;
}

/**
 *	ocp_find_device	-	Find a device by function & index
 *      @vendor: vendor ID of the device (or OCP_ANY_ID)
 *	@function: function code of the device (or OCP_ANY_ID)
 *	@idx: index of the device (or OCP_ANY_INDEX)
 *
 *	This function allows a lookup of a given function by it's
 *	index, it's typically used to find the MAL or ZMII associated
 *	with an EMAC or similar horrors.
 *      You can pass vendor, though you usually want OCP_ANY_ID there...
 */
struct ocp_device *
ocp_find_device(unsigned int vendor, unsigned int function, int index)
{
	struct ocp_device	*dev;

	down_read(&ocp_devices_sem);
	dev = __ocp_find_device(vendor, function, index);
	up_read(&ocp_devices_sem);

	return dev;
}

/**
 *	ocp_get_one_device -	Find a def by function & index
 *      @vendor: vendor ID of the device (or OCP_ANY_ID)
 *	@function: function code of the device (or OCP_ANY_ID)
 *	@idx: index of the device (or OCP_ANY_INDEX)
 *
 *	This function allows a lookup of a given ocp_def by it's
 *	vendor, function, and index.  The main purpose for is to
 *	allow modification of the def before binding to the driver
 */
struct ocp_def *
ocp_get_one_device(unsigned int vendor, unsigned int function, int index)
{
	struct ocp_device	*dev;
	struct ocp_def		*found = NULL;

	DBG(("ocp: ocp_get_one_device(vendor: %x, function: %x, index: %d)...\n",
		vendor, function, index));

	dev = ocp_find_device(vendor, function, index);

	if (dev)
		found = dev->def;

	DBG(("ocp: ocp_get_one_device(vendor: %x, function: %x, index: %d)... done.\n",
		vendor, function, index));

	return found;
}

/**
 *	ocp_add_one_device	-	Add a device
 *	@def: static device definition structure
 *
 *	This function adds a device definition to the
 *	device list. It may only be called before
 *	ocp_driver_init() and will return an error
 *	otherwise.
 */
int
ocp_add_one_device(struct ocp_def *def)
{
	struct	ocp_device	*dev;

	DBG(("ocp: ocp_add_one_device()...\n"));

	/* Can't be called after ocp driver init */
	if (ocp_inited)
		return 1;

	if (mem_init_done)
		dev = kmalloc(sizeof(*dev), GFP_KERNEL);
	else
		dev = alloc_bootmem(sizeof(*dev));

	if (dev == NULL)
		return 1;
	memset(dev, 0, sizeof(*dev));
	dev->def = def;
	dev->current_state = 4;
	sprintf(dev->name, "OCP device %04x:%04x:%04x",
		dev->def->vendor, dev->def->function, dev->def->index);
	down_write(&ocp_devices_sem);
	list_add_tail(&dev->link, &ocp_devices);
	up_write(&ocp_devices_sem);

	DBG(("ocp: ocp_add_one_device()...done\n"));

	return 0;
}

/**
 *	ocp_remove_one_device -	Remove a device by function & index
 *      @vendor: vendor ID of the device (or OCP_ANY_ID)
 *	@function: function code of the device (or OCP_ANY_ID)
 *	@idx: index of the device (or OCP_ANY_INDEX)
 *
 *	This function allows removal of a given function by its
 *	index. It may only be called before ocp_driver_init()
 *	and will return an error otherwise.
 */
int
ocp_remove_one_device(unsigned int vendor, unsigned int function, int index)
{
	struct ocp_device *dev;

	DBG(("ocp: ocp_remove_one_device(vendor: %x, function: %x, index: %d)...\n", vendor, function, index));

	/* Can't be called after ocp driver init */
	if (ocp_inited)
		return 1;

	down_write(&ocp_devices_sem);
	dev = __ocp_find_device(vendor, function, index);
	list_del((struct list_head *)dev);
	up_write(&ocp_devices_sem);

	DBG(("ocp: ocp_remove_one_device(vendor: %x, function: %x, index: %d)... done.\n", vendor, function, index));

	return 0;
}

/**
 *	ocp_for_each_device	-	Iterate over OCP devices
 *	@callback: routine to execute for each ocp device.
 *	@arg: user data to be passed to callback routine.
 *
 *	This routine holds the ocp_device semaphore, so the
 *	callback routine cannot modify the ocp_device list.
 */
void
ocp_for_each_device(void(*callback)(struct ocp_device *, void *arg), void *arg)
{
	struct list_head *entry;

	if (callback) {
		down_read(&ocp_devices_sem);
		list_for_each(entry, &ocp_devices)
			callback(list_entry(entry, struct ocp_device, link),
				arg);
		up_read(&ocp_devices_sem);
	}
}

/**
 *	ocp_early_init	-	Init OCP device management
 *
 *	This function builds the list of devices before setup_arch.
 *	This allows platform code to modify the device lists before
 *	they are bound to drivers (changes to paddr, removing devices
 *	etc)
 */
int __init
ocp_early_init(void)
{
	struct ocp_def	*def;

	DBG(("ocp: ocp_early_init()...\n"));

	/* Fill the devices list */
	for (def = core_ocp; def->vendor != OCP_VENDOR_INVALID; def++)
		ocp_add_one_device(def);

	DBG(("ocp: ocp_early_init()... done.\n"));

	return 0;
}

/**
 *	ocp_driver_init	-	Init OCP device management
 *
 *	This function is meant to be called via OCP bus registration.
 */
static int __init
ocp_driver_init(void)
{
	int ret = 0, index = 0;
	struct device *ocp_bus;
	struct list_head *entry;
	struct ocp_device *dev;

	if (ocp_inited)
		return ret;
	ocp_inited = 1;

	DBG(("ocp: ocp_driver_init()...\n"));

	/* Allocate/register primary OCP bus */
	ocp_bus = kmalloc(sizeof(struct device), GFP_KERNEL);
	if (ocp_bus == NULL)
		return 1;
	memset(ocp_bus, 0, sizeof(struct device));
	strcpy(ocp_bus->bus_id, "ocp");

	bus_register(&ocp_bus_type);

	device_register(ocp_bus);

	/* Put each OCP device into global device list */
	list_for_each(entry, &ocp_devices) {
		dev = list_entry(entry, struct ocp_device, link);
		sprintf(dev->dev.bus_id, "%2.2x", index);
		dev->dev.parent = ocp_bus;
		dev->dev.bus = &ocp_bus_type;
		device_register(&dev->dev);
		ocp_create_sysfs_dev_files(dev);
		index++;
	}

	DBG(("ocp: ocp_driver_init()... done.\n"));

	return 0;
}

postcore_initcall(ocp_driver_init);

EXPORT_SYMBOL(ocp_bus_type);
EXPORT_SYMBOL(ocp_find_device);
EXPORT_SYMBOL(ocp_register_driver);
EXPORT_SYMBOL(ocp_unregister_driver);