aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/mfd/twl6030-irq.c
blob: 4082ed73613f98a6abd0fb0a1b8463f0d45a788e (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
/*
 * 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>
 *
 * 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.
 *
 * 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/init.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/kthread.h>
#include <linux/i2c/twl.h>
#include <linux/platform_device.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.
 *
 */

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		*/
	CHARGER_INTR_OFFSET,	/* Bit 21	EXT_CHRG		*/
	CHARGER_INTR_OFFSET,	/* Bit 22	INT_CHRG		*/
	RSV_INTR_OFFSET,	/* Bit 23	Reserved		*/
};
/*----------------------------------------------------------------------*/

static unsigned twl6030_irq_base;

static struct completion irq_event;

/*
 * This thread processes interrupts reported by the Primary Interrupt Handler.
 */
static int twl6030_irq_thread(void *data)
{
	long irq = (long)data;
	static unsigned i2c_errors;
	static const unsigned max_i2c_errors = 100;
	int ret;

	current->flags |= PF_NOFREEZE;

	while (!kthread_should_stop()) {
		int i;
		union {
		u8 bytes[4];
		u32 int_sts;
		} sts;

		/* Wait for IRQ, then read PIH irq status (also blocking) */
		wait_for_completion_interruptible(&irq_event);

		/* 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_warning("twl6030: I2C error %d reading PIH ISR\n",
					ret);
			if (++i2c_errors >= max_i2c_errors) {
				printk(KERN_ERR "Maximum I2C error count"
						" exceeded.  Terminating %s.\n",
						__func__);
				break;
			}
			complete(&irq_event);
			continue;
		}



		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;

		for (i = 0; sts.int_sts; sts.int_sts >>= 1, i++) {
			local_irq_disable();
			if (sts.int_sts & 0x1) {
				int module_irq = twl6030_irq_base +
					twl6030_interrupt_mapping[i];
				struct irq_desc *d = irq_to_desc(module_irq);

				if (!d) {
					pr_err("twl6030: Invalid SIH IRQ: %d\n",
					       module_irq);
					return -EINVAL;
				}

				/* These can't be masked ... always warn
				 * if we get any surprises.
				 */
				if (d->status & IRQ_DISABLED)
					note_interrupt(module_irq, d,
							IRQ_NONE);
				else
					d->handle_irq(module_irq, d);

			}
		local_irq_enable();
		}
		ret = twl_i2c_write(TWL_MODULE_PIH, sts.bytes,
				REG_INT_STS_A, 3); /* clear INT_STS_A */
		if (ret)
			pr_warning("twl6030: I2C error in clearing PIH ISR\n");

		enable_irq(irq);
	}

	return 0;
}

/*
 * handle_twl6030_int() is the desc->handle method for the twl6030 interrupt.
 * This is a chained interrupt, so there is no desc->action method for it.
 * Now we need to query the interrupt controller in the twl6030 to determine
 * which module is generating the interrupt request.  However, we can't do i2c
 * transactions in interrupt context, so we must defer that work to a kernel
 * thread.  All we do here is acknowledge and mask the interrupt and wakeup
 * the kernel thread.
 */
static irqreturn_t handle_twl6030_pih(int irq, void *devid)
{
	disable_irq_nosync(irq);
	complete(devid);
	return IRQ_HANDLED;
}

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

static inline void activate_irq(int irq)
{
#ifdef CONFIG_ARM
	/* ARM requires an extra step to clear IRQ_NOREQUEST, which it
	 * sets on behalf of every irq_chip.  Also sets IRQ_NOPROBE.
	 */
	set_irq_flags(irq, IRQF_VALID);
#else
	/* same effect on other architectures */
	set_irq_noprobe(irq);
#endif
}

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

static unsigned twl6030_irq_next;

/*----------------------------------------------------------------------*/
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);
	/*
	 * Intially Configuring MMC_CTRL for receving 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 0;
}
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("Unkown 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);

int twl6030_init_irq(int irq_num, unsigned irq_base, unsigned irq_end)
{

	int	status = 0;
	int	i;
	struct task_struct	*task;
	int ret;
	u8 mask[4];

	static struct irq_chip	twl6030_irq_chip;
	mask[1] = 0xFF;
	mask[2] = 0xFF;
	mask[3] = 0xFF;
	ret = twl_i2c_write(TWL_MODULE_PIH, &mask[0],
			REG_INT_MSK_LINE_A, 3); /* MASK ALL INT LINES */
	ret = twl_i2c_write(TWL_MODULE_PIH, &mask[0],
			REG_INT_MSK_STS_A, 3); /* MASK ALL INT STS */
	ret = twl_i2c_write(TWL_MODULE_PIH, &mask[0],
			REG_INT_STS_A, 3); /* clear INT_STS_A,B,C */

	twl6030_irq_base = irq_base;

	/* install an irq handler for each of the modules;
	 * clone dummy irq_chip since PIH can't *do* anything
	 */
	twl6030_irq_chip = dummy_irq_chip;
	twl6030_irq_chip.name = "twl6030";
	twl6030_irq_chip.irq_set_type = NULL;

	for (i = irq_base; i < irq_end; i++) {
		set_irq_chip_and_handler(i, &twl6030_irq_chip,
				handle_simple_irq);
		activate_irq(i);
	}

	twl6030_irq_next = i;
	pr_info("twl6030: %s (irq %d) chaining IRQs %d..%d\n", "PIH",
			irq_num, irq_base, twl6030_irq_next - 1);

	/* install an irq handler to demultiplex the TWL6030 interrupt */
	init_completion(&irq_event);
	task = kthread_run(twl6030_irq_thread, (void *)irq_num, "twl6030-irq");
	if (IS_ERR(task)) {
		pr_err("twl6030: could not create irq %d thread!\n", irq_num);
		status = PTR_ERR(task);
		goto fail_kthread;
	}

	status = request_irq(irq_num, handle_twl6030_pih, IRQF_DISABLED,
				"TWL6030-PIH", &irq_event);
	if (status < 0) {
		pr_err("twl6030: could not claim irq%d: %d\n", irq_num, status);
		goto fail_irq;
	}
	return status;
fail_irq:
	free_irq(irq_num, &irq_event);

fail_kthread:
	for (i = irq_base; i < irq_end; i++)
		set_irq_chip_and_handler(i, NULL, NULL);
	return status;
}

int twl6030_exit_irq(void)
{

	if (twl6030_irq_base) {
		pr_err("twl6030: can't yet clean up IRQs?\n");
		return -ENOSYS;
	}
	return 0;
}