summaryrefslogtreecommitdiffstats
path: root/drivers/mfd/pm8921-core.c
blob: b97a97187ae992ebe9f1b55cb511636b012fde4c (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
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
/*
 * Copyright (c) 2011, Code Aurora Forum. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 and
 * only 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.
 */

#define pr_fmt(fmt) "%s: " fmt, __func__

#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/irqchip/chained_irq.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/ssbi.h>
#include <linux/regmap.h>
#include <linux/of_platform.h>
#include <linux/mfd/core.h>
#include <linux/mfd/pm8xxx/core.h>

#define	SSBI_REG_ADDR_IRQ_BASE		0x1BB

#define	SSBI_REG_ADDR_IRQ_ROOT		(SSBI_REG_ADDR_IRQ_BASE + 0)
#define	SSBI_REG_ADDR_IRQ_M_STATUS1	(SSBI_REG_ADDR_IRQ_BASE + 1)
#define	SSBI_REG_ADDR_IRQ_M_STATUS2	(SSBI_REG_ADDR_IRQ_BASE + 2)
#define	SSBI_REG_ADDR_IRQ_M_STATUS3	(SSBI_REG_ADDR_IRQ_BASE + 3)
#define	SSBI_REG_ADDR_IRQ_M_STATUS4	(SSBI_REG_ADDR_IRQ_BASE + 4)
#define	SSBI_REG_ADDR_IRQ_BLK_SEL	(SSBI_REG_ADDR_IRQ_BASE + 5)
#define	SSBI_REG_ADDR_IRQ_IT_STATUS	(SSBI_REG_ADDR_IRQ_BASE + 6)
#define	SSBI_REG_ADDR_IRQ_CONFIG	(SSBI_REG_ADDR_IRQ_BASE + 7)
#define	SSBI_REG_ADDR_IRQ_RT_STATUS	(SSBI_REG_ADDR_IRQ_BASE + 8)

#define	PM_IRQF_LVL_SEL			0x01	/* level select */
#define	PM_IRQF_MASK_FE			0x02	/* mask falling edge */
#define	PM_IRQF_MASK_RE			0x04	/* mask rising edge */
#define	PM_IRQF_CLR			0x08	/* clear interrupt */
#define	PM_IRQF_BITS_MASK		0x70
#define	PM_IRQF_BITS_SHIFT		4
#define	PM_IRQF_WRITE			0x80

#define	PM_IRQF_MASK_ALL		(PM_IRQF_MASK_FE | \
					PM_IRQF_MASK_RE)

#define REG_HWREV		0x002  /* PMIC4 revision */
#define REG_HWREV_2		0x0E8  /* PMIC4 revision 2 */

#define PM8921_NR_IRQS		256

struct pm_irq_chip {
	struct device		*dev;
	struct regmap		*regmap;
	spinlock_t		pm_irq_lock;
	struct irq_domain	*irqdomain;
	unsigned int		num_irqs;
	unsigned int		num_blocks;
	unsigned int		num_masters;
	u8			config[0];
};

struct pm8921 {
	struct device			*dev;
	struct pm_irq_chip		*irq_chip;
};

static int pm8xxx_read_block_irq(struct pm_irq_chip *chip, unsigned int bp,
				 unsigned int *ip)
{
	int	rc;

	spin_lock(&chip->pm_irq_lock);
	rc = regmap_write(chip->regmap, SSBI_REG_ADDR_IRQ_BLK_SEL, bp);
	if (rc) {
		pr_err("Failed Selecting Block %d rc=%d\n", bp, rc);
		goto bail;
	}

	rc = regmap_read(chip->regmap, SSBI_REG_ADDR_IRQ_IT_STATUS, ip);
	if (rc)
		pr_err("Failed Reading Status rc=%d\n", rc);
bail:
	spin_unlock(&chip->pm_irq_lock);
	return rc;
}

static int
pm8xxx_config_irq(struct pm_irq_chip *chip, unsigned int bp, unsigned int cp)
{
	int	rc;

	spin_lock(&chip->pm_irq_lock);
	rc = regmap_write(chip->regmap, SSBI_REG_ADDR_IRQ_BLK_SEL, bp);
	if (rc) {
		pr_err("Failed Selecting Block %d rc=%d\n", bp, rc);
		goto bail;
	}

	cp |= PM_IRQF_WRITE;
	rc = regmap_write(chip->regmap, SSBI_REG_ADDR_IRQ_CONFIG, cp);
	if (rc)
		pr_err("Failed Configuring IRQ rc=%d\n", rc);
bail:
	spin_unlock(&chip->pm_irq_lock);
	return rc;
}

static int pm8xxx_irq_block_handler(struct pm_irq_chip *chip, int block)
{
	int pmirq, irq, i, ret = 0;
	unsigned int bits;

	ret = pm8xxx_read_block_irq(chip, block, &bits);
	if (ret) {
		pr_err("Failed reading %d block ret=%d", block, ret);
		return ret;
	}
	if (!bits) {
		pr_err("block bit set in master but no irqs: %d", block);
		return 0;
	}

	/* Check IRQ bits */
	for (i = 0; i < 8; i++) {
		if (bits & (1 << i)) {
			pmirq = block * 8 + i;
			irq = irq_find_mapping(chip->irqdomain, pmirq);
			generic_handle_irq(irq);
		}
	}
	return 0;
}

static int pm8xxx_irq_master_handler(struct pm_irq_chip *chip, int master)
{
	unsigned int blockbits;
	int block_number, i, ret = 0;

	ret = regmap_read(chip->regmap, SSBI_REG_ADDR_IRQ_M_STATUS1 + master,
			  &blockbits);
	if (ret) {
		pr_err("Failed to read master %d ret=%d\n", master, ret);
		return ret;
	}
	if (!blockbits) {
		pr_err("master bit set in root but no blocks: %d", master);
		return 0;
	}

	for (i = 0; i < 8; i++)
		if (blockbits & (1 << i)) {
			block_number = master * 8 + i;	/* block # */
			ret |= pm8xxx_irq_block_handler(chip, block_number);
		}
	return ret;
}

static void pm8xxx_irq_handler(unsigned int irq, struct irq_desc *desc)
{
	struct pm_irq_chip *chip = irq_desc_get_handler_data(desc);
	struct irq_chip *irq_chip = irq_desc_get_chip(desc);
	unsigned int root;
	int	i, ret, masters = 0;

	chained_irq_enter(irq_chip, desc);

	ret = regmap_read(chip->regmap, SSBI_REG_ADDR_IRQ_ROOT, &root);
	if (ret) {
		pr_err("Can't read root status ret=%d\n", ret);
		return;
	}

	/* on pm8xxx series masters start from bit 1 of the root */
	masters = root >> 1;

	/* Read allowed masters for blocks. */
	for (i = 0; i < chip->num_masters; i++)
		if (masters & (1 << i))
			pm8xxx_irq_master_handler(chip, i);

	chained_irq_exit(irq_chip, desc);
}

static void pm8xxx_irq_mask_ack(struct irq_data *d)
{
	struct pm_irq_chip *chip = irq_data_get_irq_chip_data(d);
	unsigned int pmirq = irqd_to_hwirq(d);
	int	irq_bit;
	u8	block, config;

	block = pmirq / 8;
	irq_bit = pmirq % 8;

	config = chip->config[pmirq] | PM_IRQF_MASK_ALL | PM_IRQF_CLR;
	pm8xxx_config_irq(chip, block, config);
}

static void pm8xxx_irq_unmask(struct irq_data *d)
{
	struct pm_irq_chip *chip = irq_data_get_irq_chip_data(d);
	unsigned int pmirq = irqd_to_hwirq(d);
	int	irq_bit;
	u8	block, config;

	block = pmirq / 8;
	irq_bit = pmirq % 8;

	config = chip->config[pmirq];
	pm8xxx_config_irq(chip, block, config);
}

static int pm8xxx_irq_set_type(struct irq_data *d, unsigned int flow_type)
{
	struct pm_irq_chip *chip = irq_data_get_irq_chip_data(d);
	unsigned int pmirq = irqd_to_hwirq(d);
	int irq_bit;
	u8 block, config;

	block = pmirq / 8;
	irq_bit  = pmirq % 8;

	chip->config[pmirq] = (irq_bit << PM_IRQF_BITS_SHIFT)
							| PM_IRQF_MASK_ALL;
	if (flow_type & (IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING)) {
		if (flow_type & IRQF_TRIGGER_RISING)
			chip->config[pmirq] &= ~PM_IRQF_MASK_RE;
		if (flow_type & IRQF_TRIGGER_FALLING)
			chip->config[pmirq] &= ~PM_IRQF_MASK_FE;
	} else {
		chip->config[pmirq] |= PM_IRQF_LVL_SEL;

		if (flow_type & IRQF_TRIGGER_HIGH)
			chip->config[pmirq] &= ~PM_IRQF_MASK_RE;
		else
			chip->config[pmirq] &= ~PM_IRQF_MASK_FE;
	}

	config = chip->config[pmirq] | PM_IRQF_CLR;
	return pm8xxx_config_irq(chip, block, config);
}

static struct irq_chip pm8xxx_irq_chip = {
	.name		= "pm8xxx",
	.irq_mask_ack	= pm8xxx_irq_mask_ack,
	.irq_unmask	= pm8xxx_irq_unmask,
	.irq_set_type	= pm8xxx_irq_set_type,
	.flags		= IRQCHIP_MASK_ON_SUSPEND | IRQCHIP_SKIP_SET_WAKE,
};

/**
 * pm8xxx_get_irq_stat - get the status of the irq line
 * @chip: pointer to identify a pmic irq controller
 * @irq: the irq number
 *
 * The pm8xxx gpio and mpp rely on the interrupt block to read
 * the values on their pins. This function is to facilitate reading
 * the status of a gpio or an mpp line. The caller has to convert the
 * gpio number to irq number.
 *
 * RETURNS:
 * an int indicating the value read on that line
 */
static int pm8xxx_get_irq_stat(struct pm_irq_chip *chip, int irq)
{
	int pmirq, rc;
	unsigned int  block, bits, bit;
	unsigned long flags;
	struct irq_data *irq_data = irq_get_irq_data(irq);

	pmirq = irq_data->hwirq;

	block = pmirq / 8;
	bit = pmirq % 8;

	spin_lock_irqsave(&chip->pm_irq_lock, flags);

	rc = regmap_write(chip->regmap, SSBI_REG_ADDR_IRQ_BLK_SEL, block);
	if (rc) {
		pr_err("Failed Selecting block irq=%d pmirq=%d blk=%d rc=%d\n",
			irq, pmirq, block, rc);
		goto bail_out;
	}

	rc = regmap_read(chip->regmap, SSBI_REG_ADDR_IRQ_RT_STATUS, &bits);
	if (rc) {
		pr_err("Failed Configuring irq=%d pmirq=%d blk=%d rc=%d\n",
			irq, pmirq, block, rc);
		goto bail_out;
	}

	rc = (bits & (1 << bit)) ? 1 : 0;

bail_out:
	spin_unlock_irqrestore(&chip->pm_irq_lock, flags);

	return rc;
}

static int pm8xxx_irq_domain_map(struct irq_domain *d, unsigned int irq,
				   irq_hw_number_t hwirq)
{
	struct pm_irq_chip *chip = d->host_data;

	irq_set_chip_and_handler(irq, &pm8xxx_irq_chip, handle_level_irq);
	irq_set_chip_data(irq, chip);
#ifdef CONFIG_ARM
	set_irq_flags(irq, IRQF_VALID);
#else
	irq_set_noprobe(irq);
#endif
	return 0;
}

static const struct irq_domain_ops pm8xxx_irq_domain_ops = {
	.xlate = irq_domain_xlate_twocell,
	.map = pm8xxx_irq_domain_map,
};

static int pm8921_readb(const struct device *dev, u16 addr, u8 *val)
{
	const struct pm8xxx_drvdata *pm8921_drvdata = dev_get_drvdata(dev);
	const struct pm8921 *pmic = pm8921_drvdata->pm_chip_data;

	return ssbi_read(pmic->dev->parent, addr, val, 1);
}

static int pm8921_writeb(const struct device *dev, u16 addr, u8 val)
{
	const struct pm8xxx_drvdata *pm8921_drvdata = dev_get_drvdata(dev);
	const struct pm8921 *pmic = pm8921_drvdata->pm_chip_data;

	return ssbi_write(pmic->dev->parent, addr, &val, 1);
}

static int pm8921_read_buf(const struct device *dev, u16 addr, u8 *buf,
									int cnt)
{
	const struct pm8xxx_drvdata *pm8921_drvdata = dev_get_drvdata(dev);
	const struct pm8921 *pmic = pm8921_drvdata->pm_chip_data;

	return ssbi_read(pmic->dev->parent, addr, buf, cnt);
}

static int pm8921_write_buf(const struct device *dev, u16 addr, u8 *buf,
									int cnt)
{
	const struct pm8xxx_drvdata *pm8921_drvdata = dev_get_drvdata(dev);
	const struct pm8921 *pmic = pm8921_drvdata->pm_chip_data;

	return ssbi_write(pmic->dev->parent, addr, buf, cnt);
}

static int pm8921_read_irq_stat(const struct device *dev, int irq)
{
	const struct pm8xxx_drvdata *pm8921_drvdata = dev_get_drvdata(dev);
	const struct pm8921 *pmic = pm8921_drvdata->pm_chip_data;

	return pm8xxx_get_irq_stat(pmic->irq_chip, irq);
}

static struct pm8xxx_drvdata pm8921_drvdata = {
	.pmic_readb		= pm8921_readb,
	.pmic_writeb		= pm8921_writeb,
	.pmic_read_buf		= pm8921_read_buf,
	.pmic_write_buf		= pm8921_write_buf,
	.pmic_read_irq_stat	= pm8921_read_irq_stat,
};

static const struct regmap_config ssbi_regmap_config = {
	.reg_bits = 16,
	.val_bits = 8,
	.max_register = 0x3ff,
	.fast_io = true,
	.reg_read = ssbi_reg_read,
	.reg_write = ssbi_reg_write
};

static const struct of_device_id pm8921_id_table[] = {
	{ .compatible = "qcom,pm8058", },
	{ .compatible = "qcom,pm8921", },
	{ }
};
MODULE_DEVICE_TABLE(of, pm8921_id_table);

static int pm8921_probe(struct platform_device *pdev)
{
	struct pm8921 *pmic;
	struct regmap *regmap;
	int irq, rc;
	unsigned int val;
	u32 rev;
	struct pm_irq_chip *chip;
	unsigned int nirqs = PM8921_NR_IRQS;

	irq = platform_get_irq(pdev, 0);
	if (irq < 0)
		return irq;

	pmic = devm_kzalloc(&pdev->dev, sizeof(struct pm8921), GFP_KERNEL);
	if (!pmic) {
		pr_err("Cannot alloc pm8921 struct\n");
		return -ENOMEM;
	}

	regmap = devm_regmap_init(&pdev->dev, NULL, pdev->dev.parent,
				  &ssbi_regmap_config);
	if (IS_ERR(regmap))
		return PTR_ERR(regmap);

	/* Read PMIC chip revision */
	rc = regmap_read(regmap, REG_HWREV, &val);
	if (rc) {
		pr_err("Failed to read hw rev reg %d:rc=%d\n", REG_HWREV, rc);
		return rc;
	}
	pr_info("PMIC revision 1: %02X\n", val);
	rev = val;

	/* Read PMIC chip revision 2 */
	rc = regmap_read(regmap, REG_HWREV_2, &val);
	if (rc) {
		pr_err("Failed to read hw rev 2 reg %d:rc=%d\n",
			REG_HWREV_2, rc);
		return rc;
	}
	pr_info("PMIC revision 2: %02X\n", val);
	rev |= val << BITS_PER_BYTE;

	pmic->dev = &pdev->dev;
	pm8921_drvdata.pm_chip_data = pmic;
	platform_set_drvdata(pdev, &pm8921_drvdata);

	chip = devm_kzalloc(&pdev->dev, sizeof(*chip) +
					sizeof(chip->config[0]) * nirqs,
					GFP_KERNEL);
	if (!chip)
		return -ENOMEM;

	pmic->irq_chip = chip;
	chip->dev = &pdev->dev;
	chip->regmap = regmap;
	chip->num_irqs = nirqs;
	chip->num_blocks = DIV_ROUND_UP(chip->num_irqs, 8);
	chip->num_masters = DIV_ROUND_UP(chip->num_blocks, 8);
	spin_lock_init(&chip->pm_irq_lock);

	chip->irqdomain = irq_domain_add_linear(pdev->dev.of_node, nirqs,
						&pm8xxx_irq_domain_ops,
						chip);
	if (!chip->irqdomain)
		return -ENODEV;

	irq_set_handler_data(irq, chip);
	irq_set_chained_handler(irq, pm8xxx_irq_handler);
	irq_set_irq_wake(irq, 1);

	rc = of_platform_populate(pdev->dev.of_node, NULL, NULL, &pdev->dev);
	if (rc) {
		irq_set_chained_handler(irq, NULL);
		irq_set_handler_data(irq, NULL);
		irq_domain_remove(chip->irqdomain);
	}

	return rc;
}

static int pm8921_remove_child(struct device *dev, void *unused)
{
	platform_device_unregister(to_platform_device(dev));
	return 0;
}

static int pm8921_remove(struct platform_device *pdev)
{
	int irq = platform_get_irq(pdev, 0);
	struct pm8921 *pmic = pm8921_drvdata.pm_chip_data;
	struct pm_irq_chip *chip = pmic->irq_chip;

	device_for_each_child(&pdev->dev, NULL, pm8921_remove_child);
	irq_set_chained_handler(irq, NULL);
	irq_set_handler_data(irq, NULL);
	irq_domain_remove(chip->irqdomain);

	return 0;
}

static struct platform_driver pm8921_driver = {
	.probe		= pm8921_probe,
	.remove		= pm8921_remove,
	.driver		= {
		.name	= "pm8921-core",
		.owner	= THIS_MODULE,
		.of_match_table = pm8921_id_table,
	},
};

static int __init pm8921_init(void)
{
	return platform_driver_register(&pm8921_driver);
}
subsys_initcall(pm8921_init);

static void __exit pm8921_exit(void)
{
	platform_driver_unregister(&pm8921_driver);
}
module_exit(pm8921_exit);

MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("PMIC 8921 core driver");
MODULE_VERSION("1.0");
MODULE_ALIAS("platform:pm8921-core");