Linux Audio

Check our new training course

Embedded Linux Audio

Check our new training course
with Creative Commons CC-BY-SA
lecture materials

Bootlin logo

Elixir Cross Referencer

Loading...
  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
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
/*
 * Copyright (C) 2010 OKI SEMICONDUCTOR Co., LTD.
 *
 * 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; version 2 of the License.
 *
 * 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/module.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/pci.h>
#include <linux/gpio.h>
#include <linux/interrupt.h>
#include <linux/irq.h>

#define IOH_EDGE_FALLING	0
#define IOH_EDGE_RISING		BIT(0)
#define IOH_LEVEL_L		BIT(1)
#define IOH_LEVEL_H		(BIT(0) | BIT(1))
#define IOH_EDGE_BOTH		BIT(2)
#define IOH_IM_MASK		(BIT(0) | BIT(1) | BIT(2))

#define IOH_IRQ_BASE		0

#define PCI_VENDOR_ID_ROHM             0x10DB

struct ioh_reg_comn {
	u32	ien;
	u32	istatus;
	u32	idisp;
	u32	iclr;
	u32	imask;
	u32	imaskclr;
	u32	po;
	u32	pi;
	u32	pm;
	u32	im_0;
	u32	im_1;
	u32	reserved;
};

struct ioh_regs {
	struct ioh_reg_comn regs[8];
	u32 reserve1[16];
	u32 ioh_sel_reg[4];
	u32 reserve2[11];
	u32 srst;
};

/**
 * struct ioh_gpio_reg_data - The register store data.
 * @ien_reg	To store contents of interrupt enable register.
 * @imask_reg:	To store contents of interrupt mask regist
 * @po_reg:	To store contents of PO register.
 * @pm_reg:	To store contents of PM register.
 * @im0_reg:	To store contents of interrupt mode regist0
 * @im1_reg:	To store contents of interrupt mode regist1
 * @use_sel_reg: To store contents of GPIO_USE_SEL0~3
 */
struct ioh_gpio_reg_data {
	u32 ien_reg;
	u32 imask_reg;
	u32 po_reg;
	u32 pm_reg;
	u32 im0_reg;
	u32 im1_reg;
	u32 use_sel_reg;
};

/**
 * struct ioh_gpio - GPIO private data structure.
 * @base:			PCI base address of Memory mapped I/O register.
 * @reg:			Memory mapped IOH GPIO register list.
 * @dev:			Pointer to device structure.
 * @gpio:			Data for GPIO infrastructure.
 * @ioh_gpio_reg:		Memory mapped Register data is saved here
 *				when suspend.
 * @gpio_use_sel:		Save GPIO_USE_SEL1~4 register for PM
 * @ch:				Indicate GPIO channel
 * @irq_base:		Save base of IRQ number for interrupt
 * @spinlock:		Used for register access protection
 */
struct ioh_gpio {
	void __iomem *base;
	struct ioh_regs __iomem *reg;
	struct device *dev;
	struct gpio_chip gpio;
	struct ioh_gpio_reg_data ioh_gpio_reg;
	u32 gpio_use_sel;
	int ch;
	int irq_base;
	spinlock_t spinlock;
};

static const int num_ports[] = {6, 12, 16, 16, 15, 16, 16, 12};

static void ioh_gpio_set(struct gpio_chip *gpio, unsigned nr, int val)
{
	u32 reg_val;
	struct ioh_gpio *chip =	container_of(gpio, struct ioh_gpio, gpio);
	unsigned long flags;

	spin_lock_irqsave(&chip->spinlock, flags);
	reg_val = ioread32(&chip->reg->regs[chip->ch].po);
	if (val)
		reg_val |= (1 << nr);
	else
		reg_val &= ~(1 << nr);

	iowrite32(reg_val, &chip->reg->regs[chip->ch].po);
	spin_unlock_irqrestore(&chip->spinlock, flags);
}

static int ioh_gpio_get(struct gpio_chip *gpio, unsigned nr)
{
	struct ioh_gpio *chip =	container_of(gpio, struct ioh_gpio, gpio);

	return ioread32(&chip->reg->regs[chip->ch].pi) & (1 << nr);
}

static int ioh_gpio_direction_output(struct gpio_chip *gpio, unsigned nr,
				     int val)
{
	struct ioh_gpio *chip =	container_of(gpio, struct ioh_gpio, gpio);
	u32 pm;
	u32 reg_val;
	unsigned long flags;

	spin_lock_irqsave(&chip->spinlock, flags);
	pm = ioread32(&chip->reg->regs[chip->ch].pm) &
					((1 << num_ports[chip->ch]) - 1);
	pm |= (1 << nr);
	iowrite32(pm, &chip->reg->regs[chip->ch].pm);

	reg_val = ioread32(&chip->reg->regs[chip->ch].po);
	if (val)
		reg_val |= (1 << nr);
	else
		reg_val &= ~(1 << nr);
	iowrite32(reg_val, &chip->reg->regs[chip->ch].po);

	spin_unlock_irqrestore(&chip->spinlock, flags);

	return 0;
}

static int ioh_gpio_direction_input(struct gpio_chip *gpio, unsigned nr)
{
	struct ioh_gpio *chip =	container_of(gpio, struct ioh_gpio, gpio);
	u32 pm;
	unsigned long flags;

	spin_lock_irqsave(&chip->spinlock, flags);
	pm = ioread32(&chip->reg->regs[chip->ch].pm) &
				((1 << num_ports[chip->ch]) - 1);
	pm &= ~(1 << nr);
	iowrite32(pm, &chip->reg->regs[chip->ch].pm);
	spin_unlock_irqrestore(&chip->spinlock, flags);

	return 0;
}

#ifdef CONFIG_PM
/*
 * Save register configuration and disable interrupts.
 */
static void ioh_gpio_save_reg_conf(struct ioh_gpio *chip)
{
	int i;

	for (i = 0; i < 8; i ++, chip++) {
		chip->ioh_gpio_reg.po_reg =
					ioread32(&chip->reg->regs[chip->ch].po);
		chip->ioh_gpio_reg.pm_reg =
					ioread32(&chip->reg->regs[chip->ch].pm);
		chip->ioh_gpio_reg.ien_reg =
				       ioread32(&chip->reg->regs[chip->ch].ien);
		chip->ioh_gpio_reg.imask_reg =
				     ioread32(&chip->reg->regs[chip->ch].imask);
		chip->ioh_gpio_reg.im0_reg =
				      ioread32(&chip->reg->regs[chip->ch].im_0);
		chip->ioh_gpio_reg.im1_reg =
				      ioread32(&chip->reg->regs[chip->ch].im_1);
		if (i < 4)
			chip->ioh_gpio_reg.use_sel_reg =
					   ioread32(&chip->reg->ioh_sel_reg[i]);
	}
}

/*
 * This function restores the register configuration of the GPIO device.
 */
static void ioh_gpio_restore_reg_conf(struct ioh_gpio *chip)
{
	int i;

	for (i = 0; i < 8; i ++, chip++) {
		iowrite32(chip->ioh_gpio_reg.po_reg,
			  &chip->reg->regs[chip->ch].po);
		iowrite32(chip->ioh_gpio_reg.pm_reg,
			  &chip->reg->regs[chip->ch].pm);
		iowrite32(chip->ioh_gpio_reg.ien_reg,
			  &chip->reg->regs[chip->ch].ien);
		iowrite32(chip->ioh_gpio_reg.imask_reg,
			  &chip->reg->regs[chip->ch].imask);
		iowrite32(chip->ioh_gpio_reg.im0_reg,
			  &chip->reg->regs[chip->ch].im_0);
		iowrite32(chip->ioh_gpio_reg.im1_reg,
			  &chip->reg->regs[chip->ch].im_1);
		if (i < 4)
			iowrite32(chip->ioh_gpio_reg.use_sel_reg,
				  &chip->reg->ioh_sel_reg[i]);
	}
}
#endif

static int ioh_gpio_to_irq(struct gpio_chip *gpio, unsigned offset)
{
	struct ioh_gpio *chip = container_of(gpio, struct ioh_gpio, gpio);
	return chip->irq_base + offset;
}

static void ioh_gpio_setup(struct ioh_gpio *chip, int num_port)
{
	struct gpio_chip *gpio = &chip->gpio;

	gpio->label = dev_name(chip->dev);
	gpio->owner = THIS_MODULE;
	gpio->direction_input = ioh_gpio_direction_input;
	gpio->get = ioh_gpio_get;
	gpio->direction_output = ioh_gpio_direction_output;
	gpio->set = ioh_gpio_set;
	gpio->dbg_show = NULL;
	gpio->base = -1;
	gpio->ngpio = num_port;
	gpio->can_sleep = false;
	gpio->to_irq = ioh_gpio_to_irq;
}

static int ioh_irq_type(struct irq_data *d, unsigned int type)
{
	u32 im;
	void __iomem *im_reg;
	u32 ien;
	u32 im_pos;
	int ch;
	unsigned long flags;
	u32 val;
	int irq = d->irq;
	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
	struct ioh_gpio *chip = gc->private;

	ch = irq - chip->irq_base;
	if (irq <= chip->irq_base + 7) {
		im_reg = &chip->reg->regs[chip->ch].im_0;
		im_pos = ch;
	} else {
		im_reg = &chip->reg->regs[chip->ch].im_1;
		im_pos = ch - 8;
	}
	dev_dbg(chip->dev, "%s:irq=%d type=%d ch=%d pos=%d type=%d\n",
		__func__, irq, type, ch, im_pos, type);

	spin_lock_irqsave(&chip->spinlock, flags);

	switch (type) {
	case IRQ_TYPE_EDGE_RISING:
		val = IOH_EDGE_RISING;
		break;
	case IRQ_TYPE_EDGE_FALLING:
		val = IOH_EDGE_FALLING;
		break;
	case IRQ_TYPE_EDGE_BOTH:
		val = IOH_EDGE_BOTH;
		break;
	case IRQ_TYPE_LEVEL_HIGH:
		val = IOH_LEVEL_H;
		break;
	case IRQ_TYPE_LEVEL_LOW:
		val = IOH_LEVEL_L;
		break;
	case IRQ_TYPE_PROBE:
		goto end;
	default:
		dev_warn(chip->dev, "%s: unknown type(%dd)",
			__func__, type);
		goto end;
	}

	/* Set interrupt mode */
	im = ioread32(im_reg) & ~(IOH_IM_MASK << (im_pos * 4));
	iowrite32(im | (val << (im_pos * 4)), im_reg);

	/* iclr */
	iowrite32(BIT(ch), &chip->reg->regs[chip->ch].iclr);

	/* IMASKCLR */
	iowrite32(BIT(ch), &chip->reg->regs[chip->ch].imaskclr);

	/* Enable interrupt */
	ien = ioread32(&chip->reg->regs[chip->ch].ien);
	iowrite32(ien | BIT(ch), &chip->reg->regs[chip->ch].ien);
end:
	spin_unlock_irqrestore(&chip->spinlock, flags);

	return 0;
}

static void ioh_irq_unmask(struct irq_data *d)
{
	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
	struct ioh_gpio *chip = gc->private;

	iowrite32(1 << (d->irq - chip->irq_base),
		  &chip->reg->regs[chip->ch].imaskclr);
}

static void ioh_irq_mask(struct irq_data *d)
{
	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
	struct ioh_gpio *chip = gc->private;

	iowrite32(1 << (d->irq - chip->irq_base),
		  &chip->reg->regs[chip->ch].imask);
}

static void ioh_irq_disable(struct irq_data *d)
{
	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
	struct ioh_gpio *chip = gc->private;
	unsigned long flags;
	u32 ien;

	spin_lock_irqsave(&chip->spinlock, flags);
	ien = ioread32(&chip->reg->regs[chip->ch].ien);
	ien &= ~(1 << (d->irq - chip->irq_base));
	iowrite32(ien, &chip->reg->regs[chip->ch].ien);
	spin_unlock_irqrestore(&chip->spinlock, flags);
}

static void ioh_irq_enable(struct irq_data *d)
{
	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
	struct ioh_gpio *chip = gc->private;
	unsigned long flags;
	u32 ien;

	spin_lock_irqsave(&chip->spinlock, flags);
	ien = ioread32(&chip->reg->regs[chip->ch].ien);
	ien |= 1 << (d->irq - chip->irq_base);
	iowrite32(ien, &chip->reg->regs[chip->ch].ien);
	spin_unlock_irqrestore(&chip->spinlock, flags);
}

static irqreturn_t ioh_gpio_handler(int irq, void *dev_id)
{
	struct ioh_gpio *chip = dev_id;
	u32 reg_val;
	int i, j;
	int ret = IRQ_NONE;

	for (i = 0; i < 8; i++, chip++) {
		reg_val = ioread32(&chip->reg->regs[i].istatus);
		for (j = 0; j < num_ports[i]; j++) {
			if (reg_val & BIT(j)) {
				dev_dbg(chip->dev,
					"%s:[%d]:irq=%d status=0x%x\n",
					__func__, j, irq, reg_val);
				iowrite32(BIT(j),
					  &chip->reg->regs[chip->ch].iclr);
				generic_handle_irq(chip->irq_base + j);
				ret = IRQ_HANDLED;
			}
		}
	}
	return ret;
}

static void ioh_gpio_alloc_generic_chip(struct ioh_gpio *chip,
				unsigned int irq_start, unsigned int num)
{
	struct irq_chip_generic *gc;
	struct irq_chip_type *ct;

	gc = irq_alloc_generic_chip("ioh_gpio", 1, irq_start, chip->base,
				    handle_simple_irq);
	gc->private = chip;
	ct = gc->chip_types;

	ct->chip.irq_mask = ioh_irq_mask;
	ct->chip.irq_unmask = ioh_irq_unmask;
	ct->chip.irq_set_type = ioh_irq_type;
	ct->chip.irq_disable = ioh_irq_disable;
	ct->chip.irq_enable = ioh_irq_enable;

	irq_setup_generic_chip(gc, IRQ_MSK(num), IRQ_GC_INIT_MASK_CACHE,
			       IRQ_NOREQUEST | IRQ_NOPROBE, 0);
}

static int ioh_gpio_probe(struct pci_dev *pdev,
				    const struct pci_device_id *id)
{
	int ret;
	int i, j;
	struct ioh_gpio *chip;
	void __iomem *base;
	void *chip_save;
	int irq_base;

	ret = pci_enable_device(pdev);
	if (ret) {
		dev_err(&pdev->dev, "%s : pci_enable_device failed", __func__);
		goto err_pci_enable;
	}

	ret = pci_request_regions(pdev, KBUILD_MODNAME);
	if (ret) {
		dev_err(&pdev->dev, "pci_request_regions failed-%d", ret);
		goto err_request_regions;
	}

	base = pci_iomap(pdev, 1, 0);
	if (!base) {
		dev_err(&pdev->dev, "%s : pci_iomap failed", __func__);
		ret = -ENOMEM;
		goto err_iomap;
	}

	chip_save = kzalloc(sizeof(*chip) * 8, GFP_KERNEL);
	if (chip_save == NULL) {
		dev_err(&pdev->dev, "%s : kzalloc failed", __func__);
		ret = -ENOMEM;
		goto err_kzalloc;
	}

	chip = chip_save;
	for (i = 0; i < 8; i++, chip++) {
		chip->dev = &pdev->dev;
		chip->base = base;
		chip->reg = chip->base;
		chip->ch = i;
		spin_lock_init(&chip->spinlock);
		ioh_gpio_setup(chip, num_ports[i]);
		ret = gpiochip_add(&chip->gpio);
		if (ret) {
			dev_err(&pdev->dev, "IOH gpio: Failed to register GPIO\n");
			goto err_gpiochip_add;
		}
	}

	chip = chip_save;
	for (j = 0; j < 8; j++, chip++) {
		irq_base = irq_alloc_descs(-1, IOH_IRQ_BASE, num_ports[j],
					   NUMA_NO_NODE);
		if (irq_base < 0) {
			dev_warn(&pdev->dev,
				"ml_ioh_gpio: Failed to get IRQ base num\n");
			chip->irq_base = -1;
			ret = irq_base;
			goto err_irq_alloc_descs;
		}
		chip->irq_base = irq_base;
		ioh_gpio_alloc_generic_chip(chip, irq_base, num_ports[j]);
	}

	chip = chip_save;
	ret = request_irq(pdev->irq, ioh_gpio_handler,
			     IRQF_SHARED, KBUILD_MODNAME, chip);
	if (ret != 0) {
		dev_err(&pdev->dev,
			"%s request_irq failed\n", __func__);
		goto err_request_irq;
	}

	pci_set_drvdata(pdev, chip);

	return 0;

err_request_irq:
	chip = chip_save;
err_irq_alloc_descs:
	while (--j >= 0) {
		chip--;
		irq_free_descs(chip->irq_base, num_ports[j]);
	}

	chip = chip_save;
err_gpiochip_add:
	while (--i >= 0) {
		chip--;
		if (gpiochip_remove(&chip->gpio))
			dev_err(&pdev->dev, "Failed gpiochip_remove(%d)\n", i);
	}
	kfree(chip_save);

err_kzalloc:
	pci_iounmap(pdev, base);

err_iomap:
	pci_release_regions(pdev);

err_request_regions:
	pci_disable_device(pdev);

err_pci_enable:

	dev_err(&pdev->dev, "%s Failed returns %d\n", __func__, ret);
	return ret;
}

static void ioh_gpio_remove(struct pci_dev *pdev)
{
	int err;
	int i;
	struct ioh_gpio *chip = pci_get_drvdata(pdev);
	void *chip_save;

	chip_save = chip;

	free_irq(pdev->irq, chip);

	for (i = 0; i < 8; i++, chip++) {
		irq_free_descs(chip->irq_base, num_ports[i]);
		err = gpiochip_remove(&chip->gpio);
		if (err)
			dev_err(&pdev->dev, "Failed gpiochip_remove\n");
	}

	chip = chip_save;
	pci_iounmap(pdev, chip->base);
	pci_release_regions(pdev);
	pci_disable_device(pdev);
	kfree(chip);
}

#ifdef CONFIG_PM
static int ioh_gpio_suspend(struct pci_dev *pdev, pm_message_t state)
{
	s32 ret;
	struct ioh_gpio *chip = pci_get_drvdata(pdev);
	unsigned long flags;

	spin_lock_irqsave(&chip->spinlock, flags);
	ioh_gpio_save_reg_conf(chip);
	spin_unlock_irqrestore(&chip->spinlock, flags);

	ret = pci_save_state(pdev);
	if (ret) {
		dev_err(&pdev->dev, "pci_save_state Failed-%d\n", ret);
		return ret;
	}
	pci_disable_device(pdev);
	pci_set_power_state(pdev, PCI_D0);
	ret = pci_enable_wake(pdev, PCI_D0, 1);
	if (ret)
		dev_err(&pdev->dev, "pci_enable_wake Failed -%d\n", ret);

	return 0;
}

static int ioh_gpio_resume(struct pci_dev *pdev)
{
	s32 ret;
	struct ioh_gpio *chip = pci_get_drvdata(pdev);
	unsigned long flags;

	ret = pci_enable_wake(pdev, PCI_D0, 0);

	pci_set_power_state(pdev, PCI_D0);
	ret = pci_enable_device(pdev);
	if (ret) {
		dev_err(&pdev->dev, "pci_enable_device Failed-%d ", ret);
		return ret;
	}
	pci_restore_state(pdev);

	spin_lock_irqsave(&chip->spinlock, flags);
	iowrite32(0x01, &chip->reg->srst);
	iowrite32(0x00, &chip->reg->srst);
	ioh_gpio_restore_reg_conf(chip);
	spin_unlock_irqrestore(&chip->spinlock, flags);

	return 0;
}
#else
#define ioh_gpio_suspend NULL
#define ioh_gpio_resume NULL
#endif

static const struct pci_device_id ioh_gpio_pcidev_id[] = {
	{ PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x802E) },
	{ 0, }
};
MODULE_DEVICE_TABLE(pci, ioh_gpio_pcidev_id);

static struct pci_driver ioh_gpio_driver = {
	.name = "ml_ioh_gpio",
	.id_table = ioh_gpio_pcidev_id,
	.probe = ioh_gpio_probe,
	.remove = ioh_gpio_remove,
	.suspend = ioh_gpio_suspend,
	.resume = ioh_gpio_resume
};

module_pci_driver(ioh_gpio_driver);

MODULE_DESCRIPTION("OKI SEMICONDUCTOR ML-IOH series GPIO Driver");
MODULE_LICENSE("GPL");