aboutsummaryrefslogtreecommitdiff
path: root/drivers/mfd/sta2x11-mfd.c
blob: d31fed07aefbc51bfb620c492a2f05197886eb36 (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
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
/*
 * Copyright (c) 2009-2011 Wind River Systems, Inc.
 * Copyright (c) 2011 ST Microelectronics (Alessandro Rubini)
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/errno.h>
#include <linux/device.h>
#include <linux/slab.h>
#include <linux/list.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/pci.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/platform_device.h>
#include <linux/mfd/core.h>
#include <linux/mfd/sta2x11-mfd.h>

#include <asm/sta2x11.h>

/* This describes STA2X11 MFD chip for us, we may have several */
struct sta2x11_mfd {
	struct sta2x11_instance *instance;
	spinlock_t lock;
	struct list_head list;
	void __iomem *sctl_regs;
	void __iomem *apbreg_regs;
};

static LIST_HEAD(sta2x11_mfd_list);

/* Three functions to act on the list */
static struct sta2x11_mfd *sta2x11_mfd_find(struct pci_dev *pdev)
{
	struct sta2x11_instance *instance;
	struct sta2x11_mfd *mfd;

	if (!pdev && !list_empty(&sta2x11_mfd_list)) {
		pr_warning("%s: Unspecified device, "
			    "using first instance\n", __func__);
		return list_entry(sta2x11_mfd_list.next,
				  struct sta2x11_mfd, list);
	}

	instance = sta2x11_get_instance(pdev);
	if (!instance)
		return NULL;
	list_for_each_entry(mfd, &sta2x11_mfd_list, list) {
		if (mfd->instance == instance)
			return mfd;
	}
	return NULL;
}

static int __devinit sta2x11_mfd_add(struct pci_dev *pdev, gfp_t flags)
{
	struct sta2x11_mfd *mfd = sta2x11_mfd_find(pdev);
	struct sta2x11_instance *instance;

	if (mfd)
		return -EBUSY;
	instance = sta2x11_get_instance(pdev);
	if (!instance)
		return -EINVAL;
	mfd = kzalloc(sizeof(*mfd), flags);
	if (!mfd)
		return -ENOMEM;
	INIT_LIST_HEAD(&mfd->list);
	spin_lock_init(&mfd->lock);
	mfd->instance = instance;
	list_add(&mfd->list, &sta2x11_mfd_list);
	return 0;
}

static int __devexit mfd_remove(struct pci_dev *pdev)
{
	struct sta2x11_mfd *mfd = sta2x11_mfd_find(pdev);

	if (!mfd)
		return -ENODEV;
	list_del(&mfd->list);
	kfree(mfd);
	return 0;
}

/* These two functions are exported and are not expected to fail */
u32 sta2x11_sctl_mask(struct pci_dev *pdev, u32 reg, u32 mask, u32 val)
{
	struct sta2x11_mfd *mfd = sta2x11_mfd_find(pdev);
	u32 r;
	unsigned long flags;

	if (!mfd) {
		dev_warn(&pdev->dev, ": can't access sctl regs\n");
		return 0;
	}
	if (!mfd->sctl_regs) {
		dev_warn(&pdev->dev, ": system ctl not initialized\n");
		return 0;
	}
	spin_lock_irqsave(&mfd->lock, flags);
	r = readl(mfd->sctl_regs + reg);
	r &= ~mask;
	r |= val;
	if (mask)
		writel(r, mfd->sctl_regs + reg);
	spin_unlock_irqrestore(&mfd->lock, flags);
	return r;
}
EXPORT_SYMBOL(sta2x11_sctl_mask);

u32 sta2x11_apbreg_mask(struct pci_dev *pdev, u32 reg, u32 mask, u32 val)
{
	struct sta2x11_mfd *mfd = sta2x11_mfd_find(pdev);
	u32 r;
	unsigned long flags;

	if (!mfd) {
		dev_warn(&pdev->dev, ": can't access apb regs\n");
		return 0;
	}
	if (!mfd->apbreg_regs) {
		dev_warn(&pdev->dev, ": apb bridge not initialized\n");
		return 0;
	}
	spin_lock_irqsave(&mfd->lock, flags);
	r = readl(mfd->apbreg_regs + reg);
	r &= ~mask;
	r |= val;
	if (mask)
		writel(r, mfd->apbreg_regs + reg);
	spin_unlock_irqrestore(&mfd->lock, flags);
	return r;
}
EXPORT_SYMBOL(sta2x11_apbreg_mask);

/* Two debugfs files, for our registers (FIXME: one instance only) */
#define REG(regname) {.name = #regname, .offset = SCTL_ ## regname}
static struct debugfs_reg32 sta2x11_sctl_regs[] = {
	REG(SCCTL), REG(ARMCFG), REG(SCPLLCTL), REG(SCPLLFCTRL),
	REG(SCRESFRACT), REG(SCRESCTRL1), REG(SCRESXTRL2), REG(SCPEREN0),
	REG(SCPEREN1), REG(SCPEREN2), REG(SCGRST), REG(SCPCIPMCR1),
	REG(SCPCIPMCR2), REG(SCPCIPMSR1), REG(SCPCIPMSR2), REG(SCPCIPMSR3),
	REG(SCINTREN), REG(SCRISR), REG(SCCLKSTAT0), REG(SCCLKSTAT1),
	REG(SCCLKSTAT2), REG(SCRSTSTA),
};
#undef REG

static struct debugfs_regset32 sctl_regset = {
	.regs = sta2x11_sctl_regs,
	.nregs = ARRAY_SIZE(sta2x11_sctl_regs),
};

#define REG(regname) {.name = #regname, .offset = regname}
static struct debugfs_reg32 sta2x11_apbreg_regs[] = {
	REG(APBREG_BSR), REG(APBREG_PAER), REG(APBREG_PWAC), REG(APBREG_PRAC),
	REG(APBREG_PCG), REG(APBREG_PUR), REG(APBREG_EMU_PCG),
};
#undef REG

static struct debugfs_regset32 apbreg_regset = {
	.regs = sta2x11_apbreg_regs,
	.nregs = ARRAY_SIZE(sta2x11_apbreg_regs),
};

static struct dentry *sta2x11_sctl_debugfs;
static struct dentry *sta2x11_apbreg_debugfs;

/* Probe for the two platform devices */
static int sta2x11_sctl_probe(struct platform_device *dev)
{
	struct pci_dev **pdev;
	struct sta2x11_mfd *mfd;
	struct resource *res;

	pdev = dev->dev.platform_data;
	mfd = sta2x11_mfd_find(*pdev);
	if (!mfd)
		return -ENODEV;

	res = platform_get_resource(dev, IORESOURCE_MEM, 0);
	if (!res)
		return -ENOMEM;

	if (!request_mem_region(res->start, resource_size(res),
				"sta2x11-sctl"))
		return -EBUSY;

	mfd->sctl_regs = ioremap(res->start, resource_size(res));
	if (!mfd->sctl_regs) {
		release_mem_region(res->start, resource_size(res));
		return -ENOMEM;
	}
	sctl_regset.base = mfd->sctl_regs;
	sta2x11_sctl_debugfs = debugfs_create_regset32("sta2x11-sctl",
						  S_IFREG | S_IRUGO,
						  NULL, &sctl_regset);
	return 0;
}

static int sta2x11_apbreg_probe(struct platform_device *dev)
{
	struct pci_dev **pdev;
	struct sta2x11_mfd *mfd;
	struct resource *res;

	pdev = dev->dev.platform_data;
	dev_dbg(&dev->dev, "%s: pdata is %p\n", __func__, pdev);
	dev_dbg(&dev->dev, "%s: *pdata is %p\n", __func__, *pdev);

	mfd = sta2x11_mfd_find(*pdev);
	if (!mfd)
		return -ENODEV;

	res = platform_get_resource(dev, IORESOURCE_MEM, 0);
	if (!res)
		return -ENOMEM;

	if (!request_mem_region(res->start, resource_size(res),
				"sta2x11-apbreg"))
		return -EBUSY;

	mfd->apbreg_regs = ioremap(res->start, resource_size(res));
	if (!mfd->apbreg_regs) {
		release_mem_region(res->start, resource_size(res));
		return -ENOMEM;
	}
	dev_dbg(&dev->dev, "%s: regbase %p\n", __func__, mfd->apbreg_regs);

	apbreg_regset.base = mfd->apbreg_regs;
	sta2x11_apbreg_debugfs = debugfs_create_regset32("sta2x11-apbreg",
						  S_IFREG | S_IRUGO,
						  NULL, &apbreg_regset);
	return 0;
}

/* The two platform drivers */
static struct platform_driver sta2x11_sctl_platform_driver = {
	.driver = {
		.name	= "sta2x11-sctl",
		.owner	= THIS_MODULE,
	},
	.probe		= sta2x11_sctl_probe,
};

static int __init sta2x11_sctl_init(void)
{
	pr_info("%s\n", __func__);
	return platform_driver_register(&sta2x11_sctl_platform_driver);
}

static struct platform_driver sta2x11_platform_driver = {
	.driver = {
		.name	= "sta2x11-apbreg",
		.owner	= THIS_MODULE,
	},
	.probe		= sta2x11_apbreg_probe,
};

static int __init sta2x11_apbreg_init(void)
{
	pr_info("%s\n", __func__);
	return platform_driver_register(&sta2x11_platform_driver);
}

/*
 * What follows is the PCI device that hosts the above two pdevs.
 * Each logic block is 4kB and they are all consecutive: we use this info.
 */

/* Bar 0 */
enum bar0_cells {
	STA2X11_GPIO_0 = 0,
	STA2X11_GPIO_1,
	STA2X11_GPIO_2,
	STA2X11_GPIO_3,
	STA2X11_SCTL,
	STA2X11_SCR,
	STA2X11_TIME,
};
/* Bar 1 */
enum bar1_cells {
	STA2X11_APBREG = 0,
};
#define CELL_4K(_name, _cell) { \
		.name = _name, \
		.start = _cell * 4096, .end = _cell * 4096 + 4095, \
		.flags = IORESOURCE_MEM, \
		}

static const __devinitconst struct resource gpio_resources[] = {
	{
		.name = "sta2x11_gpio", /* 4 consecutive cells, 1 driver */
		.start = 0,
		.end = (4 * 4096) - 1,
		.flags = IORESOURCE_MEM,
	}
};
static const __devinitconst struct resource sctl_resources[] = {
	CELL_4K("sta2x11-sctl", STA2X11_SCTL),
};
static const __devinitconst struct resource scr_resources[] = {
	CELL_4K("sta2x11-scr", STA2X11_SCR),
};
static const __devinitconst struct resource time_resources[] = {
	CELL_4K("sta2x11-time", STA2X11_TIME),
};

static const __devinitconst struct resource apbreg_resources[] = {
	CELL_4K("sta2x11-apbreg", STA2X11_APBREG),
};

#define DEV(_name, _r) \
	{ .name = _name, .num_resources = ARRAY_SIZE(_r), .resources = _r, }

static __devinitdata struct mfd_cell sta2x11_mfd_bar0[] = {
	DEV("sta2x11-gpio", gpio_resources), /* offset 0: we add pdata later */
	DEV("sta2x11-sctl", sctl_resources),
	DEV("sta2x11-scr", scr_resources),
	DEV("sta2x11-time", time_resources),
};

static __devinitdata struct mfd_cell sta2x11_mfd_bar1[] = {
	DEV("sta2x11-apbreg", apbreg_resources),
};

static int sta2x11_mfd_suspend(struct pci_dev *pdev, pm_message_t state)
{
	pci_save_state(pdev);
	pci_disable_device(pdev);
	pci_set_power_state(pdev, pci_choose_state(pdev, state));

	return 0;
}

static int sta2x11_mfd_resume(struct pci_dev *pdev)
{
	int err;

	pci_set_power_state(pdev, 0);
	err = pci_enable_device(pdev);
	if (err)
		return err;
	pci_restore_state(pdev);

	return 0;
}

static int __devinit sta2x11_mfd_probe(struct pci_dev *pdev,
				       const struct pci_device_id *pci_id)
{
	int err, i;
	struct sta2x11_gpio_pdata *gpio_data;

	dev_info(&pdev->dev, "%s\n", __func__);

	err = pci_enable_device(pdev);
	if (err) {
		dev_err(&pdev->dev, "Can't enable device.\n");
		return err;
	}

	err = pci_enable_msi(pdev);
	if (err)
		dev_info(&pdev->dev, "Enable msi failed\n");

	/* Read gpio config data as pci device's platform data */
	gpio_data = dev_get_platdata(&pdev->dev);
	if (!gpio_data)
		dev_warn(&pdev->dev, "no gpio configuration\n");

	dev_dbg(&pdev->dev, "%s, gpio_data = %p (%p)\n", __func__,
		gpio_data, &gpio_data);
	dev_dbg(&pdev->dev, "%s, pdev = %p (%p)\n", __func__,
		pdev, &pdev);

	/* platform data is the pci device for all of them */
	for (i = 0; i < ARRAY_SIZE(sta2x11_mfd_bar0); i++) {
		sta2x11_mfd_bar0[i].pdata_size = sizeof(pdev);
		sta2x11_mfd_bar0[i].platform_data = &pdev;
	}
	sta2x11_mfd_bar1[0].pdata_size = sizeof(pdev);
	sta2x11_mfd_bar1[0].platform_data = &pdev;

	/* Record this pdev before mfd_add_devices: their probe looks for it */
	sta2x11_mfd_add(pdev, GFP_ATOMIC);


	err = mfd_add_devices(&pdev->dev, -1,
			      sta2x11_mfd_bar0,
			      ARRAY_SIZE(sta2x11_mfd_bar0),
			      &pdev->resource[0],
			      0);
	if (err) {
		dev_err(&pdev->dev, "mfd_add_devices[0] failed: %d\n", err);
		goto err_disable;
	}

	err = mfd_add_devices(&pdev->dev, -1,
			      sta2x11_mfd_bar1,
			      ARRAY_SIZE(sta2x11_mfd_bar1),
			      &pdev->resource[1],
			      0);
	if (err) {
		dev_err(&pdev->dev, "mfd_add_devices[1] failed: %d\n", err);
		goto err_disable;
	}

	return 0;

err_disable:
	mfd_remove_devices(&pdev->dev);
	pci_disable_device(pdev);
	pci_disable_msi(pdev);
	return err;
}

static DEFINE_PCI_DEVICE_TABLE(sta2x11_mfd_tbl) = {
	{PCI_DEVICE(PCI_VENDOR_ID_STMICRO, PCI_DEVICE_ID_STMICRO_GPIO)},
	{0,},
};

static struct pci_driver sta2x11_mfd_driver = {
	.name =		"sta2x11-mfd",
	.id_table =	sta2x11_mfd_tbl,
	.probe =	sta2x11_mfd_probe,
	.suspend =	sta2x11_mfd_suspend,
	.resume =	sta2x11_mfd_resume,
};

static int __init sta2x11_mfd_init(void)
{
	pr_info("%s\n", __func__);
	return pci_register_driver(&sta2x11_mfd_driver);
}

/*
 * All of this must be ready before "normal" devices like MMCI appear.
 * But MFD (the pci device) can't be too early. The following choice
 * prepares platform drivers very early and probe the PCI device later,
 * but before other PCI devices.
 */
subsys_initcall(sta2x11_apbreg_init);
subsys_initcall(sta2x11_sctl_init);
rootfs_initcall(sta2x11_mfd_init);

MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Wind River");
MODULE_DESCRIPTION("STA2x11 mfd for GPIO, SCTL and APBREG");
MODULE_DEVICE_TABLE(pci, sta2x11_mfd_tbl);