summaryrefslogtreecommitdiff
path: root/drivers/mfd/twl6030-irq.c
blob: f9fce8408c2cf401a2d40adc3048515335abf610 (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
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * twl6030-irq.c - TWL6030 irq support
 *
 * Copyright (C) 2005-2009 Texas Instruments, Inc.
 *
 * Modifications to defer interrupt handling to a kernel thread:
 * Copyright (C) 2006 MontaVista Software, Inc.
 *
 * Based on tlv320aic23.c:
 * Copyright (c) by Kai Svahn <kai.svahn@nokia.com>
 *
 * Code cleanup and modifications to IRQ handler.
 * by syed khasim <x0khasim@ti.com>
 *
 * TWL6030 specific code and IRQ handling changes by
 * Jagadeesh Bhaskar Pakaravoor <j-pakaravoor@ti.com>
 * Balaji T K <balajitk@ti.com>
 */

#include <linux/export.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/kthread.h>
#include <linux/mfd/twl.h>
#include <linux/platform_device.h>
#include <linux/property.h>
#include <linux/suspend.h>
#include <linux/of.h>
#include <linux/irqdomain.h>

#include "twl-core.h"

/*
 * TWL6030 (unlike its predecessors, which had two level interrupt handling)
 * three interrupt registers INT_STS_A, INT_STS_B and INT_STS_C.
 * It exposes status bits saying who has raised an interrupt. There are
 * three mask registers that corresponds to these status registers, that
 * enables/disables these interrupts.
 *
 * We set up IRQs starting at a platform-specified base. An interrupt map table,
 * specifies mapping between interrupt number and the associated module.
 */
#define TWL6030_NR_IRQS    20

static int twl6030_interrupt_mapping[24] = {
	PWR_INTR_OFFSET,	/* Bit 0	PWRON			*/
	PWR_INTR_OFFSET,	/* Bit 1	RPWRON			*/
	PWR_INTR_OFFSET,	/* Bit 2	BAT_VLOW		*/
	RTC_INTR_OFFSET,	/* Bit 3	RTC_ALARM		*/
	RTC_INTR_OFFSET,	/* Bit 4	RTC_PERIOD		*/
	HOTDIE_INTR_OFFSET,	/* Bit 5	HOT_DIE			*/
	SMPSLDO_INTR_OFFSET,	/* Bit 6	VXXX_SHORT		*/
	SMPSLDO_INTR_OFFSET,	/* Bit 7	VMMC_SHORT		*/

	SMPSLDO_INTR_OFFSET,	/* Bit 8	VUSIM_SHORT		*/
	BATDETECT_INTR_OFFSET,	/* Bit 9	BAT			*/
	SIMDETECT_INTR_OFFSET,	/* Bit 10	SIM			*/
	MMCDETECT_INTR_OFFSET,	/* Bit 11	MMC			*/
	RSV_INTR_OFFSET,	/* Bit 12	Reserved		*/
	MADC_INTR_OFFSET,	/* Bit 13	GPADC_RT_EOC		*/
	MADC_INTR_OFFSET,	/* Bit 14	GPADC_SW_EOC		*/
	GASGAUGE_INTR_OFFSET,	/* Bit 15	CC_AUTOCAL		*/

	USBOTG_INTR_OFFSET,	/* Bit 16	ID_WKUP			*/
	USBOTG_INTR_OFFSET,	/* Bit 17	VBUS_WKUP		*/
	USBOTG_INTR_OFFSET,	/* Bit 18	ID			*/
	USB_PRES_INTR_OFFSET,	/* Bit 19	VBUS			*/
	CHARGER_INTR_OFFSET,	/* Bit 20	CHRG_CTRL		*/
	CHARGERFAULT_INTR_OFFSET,	/* Bit 21	EXT_CHRG	*/
	CHARGERFAULT_INTR_OFFSET,	/* Bit 22	INT_CHRG	*/
	RSV_INTR_OFFSET,	/* Bit 23	Reserved		*/
};

static int twl6032_interrupt_mapping[24] = {
	PWR_INTR_OFFSET,	/* Bit 0	PWRON			*/
	PWR_INTR_OFFSET,	/* Bit 1	RPWRON			*/
	PWR_INTR_OFFSET,	/* Bit 2	SYS_VLOW		*/
	RTC_INTR_OFFSET,	/* Bit 3	RTC_ALARM		*/
	RTC_INTR_OFFSET,	/* Bit 4	RTC_PERIOD		*/
	HOTDIE_INTR_OFFSET,	/* Bit 5	HOT_DIE			*/
	SMPSLDO_INTR_OFFSET,	/* Bit 6	VXXX_SHORT		*/
	PWR_INTR_OFFSET,	/* Bit 7	SPDURATION		*/

	PWR_INTR_OFFSET,	/* Bit 8	WATCHDOG		*/
	BATDETECT_INTR_OFFSET,	/* Bit 9	BAT			*/
	SIMDETECT_INTR_OFFSET,	/* Bit 10	SIM			*/
	MMCDETECT_INTR_OFFSET,	/* Bit 11	MMC			*/
	MADC_INTR_OFFSET,	/* Bit 12	GPADC_RT_EOC		*/
	MADC_INTR_OFFSET,	/* Bit 13	GPADC_SW_EOC		*/
	GASGAUGE_INTR_OFFSET,	/* Bit 14	CC_EOC			*/
	GASGAUGE_INTR_OFFSET,	/* Bit 15	CC_AUTOCAL		*/

	USBOTG_INTR_OFFSET,	/* Bit 16	ID_WKUP			*/
	USBOTG_INTR_OFFSET,	/* Bit 17	VBUS_WKUP		*/
	USBOTG_INTR_OFFSET,	/* Bit 18	ID			*/
	USB_PRES_INTR_OFFSET,	/* Bit 19	VBUS			*/
	CHARGER_INTR_OFFSET,	/* Bit 20	CHRG_CTRL		*/
	CHARGERFAULT_INTR_OFFSET,	/* Bit 21	EXT_CHRG	*/
	CHARGERFAULT_INTR_OFFSET,	/* Bit 22	INT_CHRG	*/
	RSV_INTR_OFFSET,	/* Bit 23	Reserved		*/
};

/*----------------------------------------------------------------------*/

struct twl6030_irq {
	unsigned int		irq_base;
	int			twl_irq;
	bool			irq_wake_enabled;
	atomic_t		wakeirqs;
	struct notifier_block	pm_nb;
	struct irq_chip		irq_chip;
	struct irq_domain	*irq_domain;
	const int		*irq_mapping_tbl;
};

static struct twl6030_irq *twl6030_irq;

static int twl6030_irq_pm_notifier(struct notifier_block *notifier,
				   unsigned long pm_event, void *unused)
{
	int chained_wakeups;
	struct twl6030_irq *pdata = container_of(notifier, struct twl6030_irq,
						  pm_nb);

	switch (pm_event) {
	case PM_SUSPEND_PREPARE:
		chained_wakeups = atomic_read(&pdata->wakeirqs);

		if (chained_wakeups && !pdata->irq_wake_enabled) {
			if (enable_irq_wake(pdata->twl_irq))
				pr_err("twl6030 IRQ wake enable failed\n");
			else
				pdata->irq_wake_enabled = true;
		} else if (!chained_wakeups && pdata->irq_wake_enabled) {
			disable_irq_wake(pdata->twl_irq);
			pdata->irq_wake_enabled = false;
		}

		disable_irq(pdata->twl_irq);
		break;

	case PM_POST_SUSPEND:
		enable_irq(pdata->twl_irq);
		break;

	default:
		break;
	}

	return NOTIFY_DONE;
}

/*
* Threaded irq handler for the twl6030 interrupt.
* We query the interrupt controller in the twl6030 to determine
* which module is generating the interrupt request and call
* handle_nested_irq for that module.
*/
static irqreturn_t twl6030_irq_thread(int irq, void *data)
{
	int i, ret;
	union {
		u8 bytes[4];
		__le32 int_sts;
	} sts;
	u32 int_sts; /* sts.int_sts converted to CPU endianness */
	struct twl6030_irq *pdata = data;

	/* read INT_STS_A, B and C in one shot using a burst read */
	ret = twl_i2c_read(TWL_MODULE_PIH, sts.bytes, REG_INT_STS_A, 3);
	if (ret) {
		pr_warn("twl6030_irq: I2C error %d reading PIH ISR\n", ret);
		return IRQ_HANDLED;
	}

	sts.bytes[3] = 0; /* Only 24 bits are valid*/

	/*
	 * Since VBUS status bit is not reliable for VBUS disconnect
	 * use CHARGER VBUS detection status bit instead.
	 */
	if (sts.bytes[2] & 0x10)
		sts.bytes[2] |= 0x08;

	int_sts = le32_to_cpu(sts.int_sts);
	for (i = 0; int_sts; int_sts >>= 1, i++)
		if (int_sts & 0x1) {
			int module_irq =
				irq_find_mapping(pdata->irq_domain,
						 pdata->irq_mapping_tbl[i]);
			if (module_irq)
				handle_nested_irq(module_irq);
			else
				pr_err("twl6030_irq: Unmapped PIH ISR %u detected\n",
				       i);
			pr_debug("twl6030_irq: PIH ISR %u, virq%u\n",
				 i, module_irq);
		}

	/*
	 * NOTE:
	 * Simulation confirms that documentation is wrong w.r.t the
	 * interrupt status clear operation. A single *byte* write to
	 * any one of STS_A to STS_C register results in all three
	 * STS registers being reset. Since it does not matter which
	 * value is written, all three registers are cleared on a
	 * single byte write, so we just use 0x0 to clear.
	 */
	ret = twl_i2c_write_u8(TWL_MODULE_PIH, 0x00, REG_INT_STS_A);
	if (ret)
		pr_warn("twl6030_irq: I2C error in clearing PIH ISR\n");

	return IRQ_HANDLED;
}

/*----------------------------------------------------------------------*/

static int twl6030_irq_set_wake(struct irq_data *d, unsigned int on)
{
	struct twl6030_irq *pdata = irq_data_get_irq_chip_data(d);

	if (on)
		atomic_inc(&pdata->wakeirqs);
	else
		atomic_dec(&pdata->wakeirqs);

	return 0;
}

int twl6030_interrupt_unmask(u8 bit_mask, u8 offset)
{
	int ret;
	u8 unmask_value;

	ret = twl_i2c_read_u8(TWL_MODULE_PIH, &unmask_value,
			REG_INT_STS_A + offset);
	unmask_value &= (~(bit_mask));
	ret |= twl_i2c_write_u8(TWL_MODULE_PIH, unmask_value,
			REG_INT_STS_A + offset); /* unmask INT_MSK_A/B/C */
	return ret;
}
EXPORT_SYMBOL(twl6030_interrupt_unmask);

int twl6030_interrupt_mask(u8 bit_mask, u8 offset)
{
	int ret;
	u8 mask_value;

	ret = twl_i2c_read_u8(TWL_MODULE_PIH, &mask_value,
			REG_INT_STS_A + offset);
	mask_value |= (bit_mask);
	ret |= twl_i2c_write_u8(TWL_MODULE_PIH, mask_value,
			REG_INT_STS_A + offset); /* mask INT_MSK_A/B/C */
	return ret;
}
EXPORT_SYMBOL(twl6030_interrupt_mask);

int twl6030_mmc_card_detect_config(void)
{
	int ret;
	u8 reg_val = 0;

	/* Unmasking the Card detect Interrupt line for MMC1 from Phoenix */
	twl6030_interrupt_unmask(TWL6030_MMCDETECT_INT_MASK,
						REG_INT_MSK_LINE_B);
	twl6030_interrupt_unmask(TWL6030_MMCDETECT_INT_MASK,
						REG_INT_MSK_STS_B);
	/*
	 * Initially Configuring MMC_CTRL for receiving interrupts &
	 * Card status on TWL6030 for MMC1
	 */
	ret = twl_i2c_read_u8(TWL6030_MODULE_ID0, &reg_val, TWL6030_MMCCTRL);
	if (ret < 0) {
		pr_err("twl6030: Failed to read MMCCTRL, error %d\n", ret);
		return ret;
	}
	reg_val &= ~VMMC_AUTO_OFF;
	reg_val |= SW_FC;
	ret = twl_i2c_write_u8(TWL6030_MODULE_ID0, reg_val, TWL6030_MMCCTRL);
	if (ret < 0) {
		pr_err("twl6030: Failed to write MMCCTRL, error %d\n", ret);
		return ret;
	}

	/* Configuring PullUp-PullDown register */
	ret = twl_i2c_read_u8(TWL6030_MODULE_ID0, &reg_val,
						TWL6030_CFG_INPUT_PUPD3);
	if (ret < 0) {
		pr_err("twl6030: Failed to read CFG_INPUT_PUPD3, error %d\n",
									ret);
		return ret;
	}
	reg_val &= ~(MMC_PU | MMC_PD);
	ret = twl_i2c_write_u8(TWL6030_MODULE_ID0, reg_val,
						TWL6030_CFG_INPUT_PUPD3);
	if (ret < 0) {
		pr_err("twl6030: Failed to write CFG_INPUT_PUPD3, error %d\n",
									ret);
		return ret;
	}

	return irq_find_mapping(twl6030_irq->irq_domain,
				 MMCDETECT_INTR_OFFSET);
}
EXPORT_SYMBOL(twl6030_mmc_card_detect_config);

int twl6030_mmc_card_detect(struct device *dev, int slot)
{
	int ret = -EIO;
	u8 read_reg = 0;
	struct platform_device *pdev = to_platform_device(dev);

	if (pdev->id) {
		/* TWL6030 provide's Card detect support for
		 * only MMC1 controller.
		 */
		pr_err("Unknown MMC controller %d in %s\n", pdev->id, __func__);
		return ret;
	}
	/*
	 * BIT0 of MMC_CTRL on TWL6030 provides card status for MMC1
	 * 0 - Card not present ,1 - Card present
	 */
	ret = twl_i2c_read_u8(TWL6030_MODULE_ID0, &read_reg,
						TWL6030_MMCCTRL);
	if (ret >= 0)
		ret = read_reg & STS_MMC;
	return ret;
}
EXPORT_SYMBOL(twl6030_mmc_card_detect);

static int twl6030_irq_map(struct irq_domain *d, unsigned int virq,
			      irq_hw_number_t hwirq)
{
	struct twl6030_irq *pdata = d->host_data;

	irq_set_chip_data(virq, pdata);
	irq_set_chip_and_handler(virq,  &pdata->irq_chip, handle_simple_irq);
	irq_set_nested_thread(virq, true);
	irq_set_parent(virq, pdata->twl_irq);
	irq_set_noprobe(virq);

	return 0;
}

static void twl6030_irq_unmap(struct irq_domain *d, unsigned int virq)
{
	irq_set_chip_and_handler(virq, NULL, NULL);
	irq_set_chip_data(virq, NULL);
}

static const struct irq_domain_ops twl6030_irq_domain_ops = {
	.map	= twl6030_irq_map,
	.unmap	= twl6030_irq_unmap,
	.xlate	= irq_domain_xlate_onetwocell,
};

static const struct of_device_id twl6030_of_match[] __maybe_unused = {
	{.compatible = "ti,twl6030", &twl6030_interrupt_mapping},
	{.compatible = "ti,twl6032", &twl6032_interrupt_mapping},
	{ },
};

int twl6030_init_irq(struct device *dev, int irq_num)
{
	struct			device_node *node = dev->of_node;
	int			nr_irqs;
	int			status;
	u8			mask[3];
	const int		*irq_tbl;

	irq_tbl = device_get_match_data(dev);
	if (!irq_tbl) {
		dev_err(dev, "Unknown TWL device model\n");
		return -EINVAL;
	}

	nr_irqs = TWL6030_NR_IRQS;

	twl6030_irq = devm_kzalloc(dev, sizeof(*twl6030_irq), GFP_KERNEL);
	if (!twl6030_irq)
		return -ENOMEM;

	mask[0] = 0xFF;
	mask[1] = 0xFF;
	mask[2] = 0xFF;

	/* mask all int lines */
	status = twl_i2c_write(TWL_MODULE_PIH, &mask[0], REG_INT_MSK_LINE_A, 3);
	/* mask all int sts */
	status |= twl_i2c_write(TWL_MODULE_PIH, &mask[0], REG_INT_MSK_STS_A, 3);
	/* clear INT_STS_A,B,C */
	status |= twl_i2c_write(TWL_MODULE_PIH, &mask[0], REG_INT_STS_A, 3);

	if (status < 0) {
		dev_err(dev, "I2C err writing TWL_MODULE_PIH: %d\n", status);
		return status;
	}

	/*
	 * install an irq handler for each of the modules;
	 * clone dummy irq_chip since PIH can't *do* anything
	 */
	twl6030_irq->irq_chip = dummy_irq_chip;
	twl6030_irq->irq_chip.name = "twl6030";
	twl6030_irq->irq_chip.irq_set_type = NULL;
	twl6030_irq->irq_chip.irq_set_wake = twl6030_irq_set_wake;

	twl6030_irq->pm_nb.notifier_call = twl6030_irq_pm_notifier;
	atomic_set(&twl6030_irq->wakeirqs, 0);
	twl6030_irq->irq_mapping_tbl = irq_tbl;

	twl6030_irq->irq_domain =
		irq_domain_add_linear(node, nr_irqs,
				      &twl6030_irq_domain_ops, twl6030_irq);
	if (!twl6030_irq->irq_domain) {
		dev_err(dev, "Can't add irq_domain\n");
		return -ENOMEM;
	}

	dev_info(dev, "PIH (irq %d) nested IRQs\n", irq_num);

	/* install an irq handler to demultiplex the TWL6030 interrupt */
	status = request_threaded_irq(irq_num, NULL, twl6030_irq_thread,
				      IRQF_ONESHOT, "TWL6030-PIH", twl6030_irq);
	if (status < 0) {
		dev_err(dev, "could not claim irq %d: %d\n", irq_num, status);
		goto fail_irq;
	}

	twl6030_irq->twl_irq = irq_num;
	register_pm_notifier(&twl6030_irq->pm_nb);
	return 0;

fail_irq:
	irq_domain_remove(twl6030_irq->irq_domain);
	return status;
}

void twl6030_exit_irq(void)
{
	if (twl6030_irq && twl6030_irq->twl_irq) {
		unregister_pm_notifier(&twl6030_irq->pm_nb);
		free_irq(twl6030_irq->twl_irq, NULL);
		/*
		 * TODO: IRQ domain and allocated nested IRQ descriptors
		 * should be freed somehow here. Now It can't be done, because
		 * child devices will not be deleted during removing of
		 * TWL Core driver and they will still contain allocated
		 * virt IRQs in their Resources tables.
		 * The same prevents us from using devm_request_threaded_irq()
		 * in this module.
		 */
	}
}