drm/qxl: add support for > 1 output
[linux-2.6.git] / drivers / mfd / twl6030-irq.c
blob277a8dba42d5742903863e1bfc325297e0f671aa
1 /*
2 * twl6030-irq.c - TWL6030 irq support
4 * Copyright (C) 2005-2009 Texas Instruments, Inc.
6 * Modifications to defer interrupt handling to a kernel thread:
7 * Copyright (C) 2006 MontaVista Software, Inc.
9 * Based on tlv320aic23.c:
10 * Copyright (c) by Kai Svahn <kai.svahn@nokia.com>
12 * Code cleanup and modifications to IRQ handler.
13 * by syed khasim <x0khasim@ti.com>
15 * TWL6030 specific code and IRQ handling changes by
16 * Jagadeesh Bhaskar Pakaravoor <j-pakaravoor@ti.com>
17 * Balaji T K <balajitk@ti.com>
19 * This program is free software; you can redistribute it and/or modify
20 * it under the terms of the GNU General Public License as published by
21 * the Free Software Foundation; either version 2 of the License, or
22 * (at your option) any later version.
24 * This program is distributed in the hope that it will be useful,
25 * but WITHOUT ANY WARRANTY; without even the implied warranty of
26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
27 * GNU General Public License for more details.
29 * You should have received a copy of the GNU General Public License
30 * along with this program; if not, write to the Free Software
31 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
34 #include <linux/init.h>
35 #include <linux/export.h>
36 #include <linux/interrupt.h>
37 #include <linux/irq.h>
38 #include <linux/kthread.h>
39 #include <linux/i2c/twl.h>
40 #include <linux/platform_device.h>
41 #include <linux/suspend.h>
42 #include <linux/of.h>
43 #include <linux/irqdomain.h>
45 #include "twl-core.h"
48 * TWL6030 (unlike its predecessors, which had two level interrupt handling)
49 * three interrupt registers INT_STS_A, INT_STS_B and INT_STS_C.
50 * It exposes status bits saying who has raised an interrupt. There are
51 * three mask registers that corresponds to these status registers, that
52 * enables/disables these interrupts.
54 * We set up IRQs starting at a platform-specified base. An interrupt map table,
55 * specifies mapping between interrupt number and the associated module.
57 #define TWL6030_NR_IRQS 20
59 static int twl6030_interrupt_mapping[24] = {
60 PWR_INTR_OFFSET, /* Bit 0 PWRON */
61 PWR_INTR_OFFSET, /* Bit 1 RPWRON */
62 PWR_INTR_OFFSET, /* Bit 2 BAT_VLOW */
63 RTC_INTR_OFFSET, /* Bit 3 RTC_ALARM */
64 RTC_INTR_OFFSET, /* Bit 4 RTC_PERIOD */
65 HOTDIE_INTR_OFFSET, /* Bit 5 HOT_DIE */
66 SMPSLDO_INTR_OFFSET, /* Bit 6 VXXX_SHORT */
67 SMPSLDO_INTR_OFFSET, /* Bit 7 VMMC_SHORT */
69 SMPSLDO_INTR_OFFSET, /* Bit 8 VUSIM_SHORT */
70 BATDETECT_INTR_OFFSET, /* Bit 9 BAT */
71 SIMDETECT_INTR_OFFSET, /* Bit 10 SIM */
72 MMCDETECT_INTR_OFFSET, /* Bit 11 MMC */
73 RSV_INTR_OFFSET, /* Bit 12 Reserved */
74 MADC_INTR_OFFSET, /* Bit 13 GPADC_RT_EOC */
75 MADC_INTR_OFFSET, /* Bit 14 GPADC_SW_EOC */
76 GASGAUGE_INTR_OFFSET, /* Bit 15 CC_AUTOCAL */
78 USBOTG_INTR_OFFSET, /* Bit 16 ID_WKUP */
79 USBOTG_INTR_OFFSET, /* Bit 17 VBUS_WKUP */
80 USBOTG_INTR_OFFSET, /* Bit 18 ID */
81 USB_PRES_INTR_OFFSET, /* Bit 19 VBUS */
82 CHARGER_INTR_OFFSET, /* Bit 20 CHRG_CTRL */
83 CHARGERFAULT_INTR_OFFSET, /* Bit 21 EXT_CHRG */
84 CHARGERFAULT_INTR_OFFSET, /* Bit 22 INT_CHRG */
85 RSV_INTR_OFFSET, /* Bit 23 Reserved */
87 /*----------------------------------------------------------------------*/
89 static unsigned twl6030_irq_base;
90 static int twl_irq;
91 static bool twl_irq_wake_enabled;
93 static struct completion irq_event;
94 static atomic_t twl6030_wakeirqs = ATOMIC_INIT(0);
96 static int twl6030_irq_pm_notifier(struct notifier_block *notifier,
97 unsigned long pm_event, void *unused)
99 int chained_wakeups;
101 switch (pm_event) {
102 case PM_SUSPEND_PREPARE:
103 chained_wakeups = atomic_read(&twl6030_wakeirqs);
105 if (chained_wakeups && !twl_irq_wake_enabled) {
106 if (enable_irq_wake(twl_irq))
107 pr_err("twl6030 IRQ wake enable failed\n");
108 else
109 twl_irq_wake_enabled = true;
110 } else if (!chained_wakeups && twl_irq_wake_enabled) {
111 disable_irq_wake(twl_irq);
112 twl_irq_wake_enabled = false;
115 disable_irq(twl_irq);
116 break;
118 case PM_POST_SUSPEND:
119 enable_irq(twl_irq);
120 break;
122 default:
123 break;
126 return NOTIFY_DONE;
129 static struct notifier_block twl6030_irq_pm_notifier_block = {
130 .notifier_call = twl6030_irq_pm_notifier,
134 * This thread processes interrupts reported by the Primary Interrupt Handler.
136 static int twl6030_irq_thread(void *data)
138 long irq = (long)data;
139 static unsigned i2c_errors;
140 static const unsigned max_i2c_errors = 100;
141 int ret;
143 while (!kthread_should_stop()) {
144 int i;
145 union {
146 u8 bytes[4];
147 u32 int_sts;
148 } sts;
150 /* Wait for IRQ, then read PIH irq status (also blocking) */
151 wait_for_completion_interruptible(&irq_event);
153 /* read INT_STS_A, B and C in one shot using a burst read */
154 ret = twl_i2c_read(TWL_MODULE_PIH, sts.bytes,
155 REG_INT_STS_A, 3);
156 if (ret) {
157 pr_warning("twl6030: I2C error %d reading PIH ISR\n",
158 ret);
159 if (++i2c_errors >= max_i2c_errors) {
160 printk(KERN_ERR "Maximum I2C error count"
161 " exceeded. Terminating %s.\n",
162 __func__);
163 break;
165 complete(&irq_event);
166 continue;
171 sts.bytes[3] = 0; /* Only 24 bits are valid*/
174 * Since VBUS status bit is not reliable for VBUS disconnect
175 * use CHARGER VBUS detection status bit instead.
177 if (sts.bytes[2] & 0x10)
178 sts.bytes[2] |= 0x08;
180 for (i = 0; sts.int_sts; sts.int_sts >>= 1, i++) {
181 local_irq_disable();
182 if (sts.int_sts & 0x1) {
183 int module_irq = twl6030_irq_base +
184 twl6030_interrupt_mapping[i];
185 generic_handle_irq(module_irq);
188 local_irq_enable();
192 * NOTE:
193 * Simulation confirms that documentation is wrong w.r.t the
194 * interrupt status clear operation. A single *byte* write to
195 * any one of STS_A to STS_C register results in all three
196 * STS registers being reset. Since it does not matter which
197 * value is written, all three registers are cleared on a
198 * single byte write, so we just use 0x0 to clear.
200 ret = twl_i2c_write_u8(TWL_MODULE_PIH, 0x00, REG_INT_STS_A);
201 if (ret)
202 pr_warning("twl6030: I2C error in clearing PIH ISR\n");
204 enable_irq(irq);
207 return 0;
211 * handle_twl6030_int() is the desc->handle method for the twl6030 interrupt.
212 * This is a chained interrupt, so there is no desc->action method for it.
213 * Now we need to query the interrupt controller in the twl6030 to determine
214 * which module is generating the interrupt request. However, we can't do i2c
215 * transactions in interrupt context, so we must defer that work to a kernel
216 * thread. All we do here is acknowledge and mask the interrupt and wakeup
217 * the kernel thread.
219 static irqreturn_t handle_twl6030_pih(int irq, void *devid)
221 disable_irq_nosync(irq);
222 complete(devid);
223 return IRQ_HANDLED;
226 /*----------------------------------------------------------------------*/
228 static inline void activate_irq(int irq)
230 #ifdef CONFIG_ARM
231 /* ARM requires an extra step to clear IRQ_NOREQUEST, which it
232 * sets on behalf of every irq_chip. Also sets IRQ_NOPROBE.
234 set_irq_flags(irq, IRQF_VALID);
235 #else
236 /* same effect on other architectures */
237 irq_set_noprobe(irq);
238 #endif
241 static int twl6030_irq_set_wake(struct irq_data *d, unsigned int on)
243 if (on)
244 atomic_inc(&twl6030_wakeirqs);
245 else
246 atomic_dec(&twl6030_wakeirqs);
248 return 0;
251 int twl6030_interrupt_unmask(u8 bit_mask, u8 offset)
253 int ret;
254 u8 unmask_value;
255 ret = twl_i2c_read_u8(TWL_MODULE_PIH, &unmask_value,
256 REG_INT_STS_A + offset);
257 unmask_value &= (~(bit_mask));
258 ret |= twl_i2c_write_u8(TWL_MODULE_PIH, unmask_value,
259 REG_INT_STS_A + offset); /* unmask INT_MSK_A/B/C */
260 return ret;
262 EXPORT_SYMBOL(twl6030_interrupt_unmask);
264 int twl6030_interrupt_mask(u8 bit_mask, u8 offset)
266 int ret;
267 u8 mask_value;
268 ret = twl_i2c_read_u8(TWL_MODULE_PIH, &mask_value,
269 REG_INT_STS_A + offset);
270 mask_value |= (bit_mask);
271 ret |= twl_i2c_write_u8(TWL_MODULE_PIH, mask_value,
272 REG_INT_STS_A + offset); /* mask INT_MSK_A/B/C */
273 return ret;
275 EXPORT_SYMBOL(twl6030_interrupt_mask);
277 int twl6030_mmc_card_detect_config(void)
279 int ret;
280 u8 reg_val = 0;
282 /* Unmasking the Card detect Interrupt line for MMC1 from Phoenix */
283 twl6030_interrupt_unmask(TWL6030_MMCDETECT_INT_MASK,
284 REG_INT_MSK_LINE_B);
285 twl6030_interrupt_unmask(TWL6030_MMCDETECT_INT_MASK,
286 REG_INT_MSK_STS_B);
288 * Initially Configuring MMC_CTRL for receiving interrupts &
289 * Card status on TWL6030 for MMC1
291 ret = twl_i2c_read_u8(TWL6030_MODULE_ID0, &reg_val, TWL6030_MMCCTRL);
292 if (ret < 0) {
293 pr_err("twl6030: Failed to read MMCCTRL, error %d\n", ret);
294 return ret;
296 reg_val &= ~VMMC_AUTO_OFF;
297 reg_val |= SW_FC;
298 ret = twl_i2c_write_u8(TWL6030_MODULE_ID0, reg_val, TWL6030_MMCCTRL);
299 if (ret < 0) {
300 pr_err("twl6030: Failed to write MMCCTRL, error %d\n", ret);
301 return ret;
304 /* Configuring PullUp-PullDown register */
305 ret = twl_i2c_read_u8(TWL6030_MODULE_ID0, &reg_val,
306 TWL6030_CFG_INPUT_PUPD3);
307 if (ret < 0) {
308 pr_err("twl6030: Failed to read CFG_INPUT_PUPD3, error %d\n",
309 ret);
310 return ret;
312 reg_val &= ~(MMC_PU | MMC_PD);
313 ret = twl_i2c_write_u8(TWL6030_MODULE_ID0, reg_val,
314 TWL6030_CFG_INPUT_PUPD3);
315 if (ret < 0) {
316 pr_err("twl6030: Failed to write CFG_INPUT_PUPD3, error %d\n",
317 ret);
318 return ret;
321 return twl6030_irq_base + MMCDETECT_INTR_OFFSET;
323 EXPORT_SYMBOL(twl6030_mmc_card_detect_config);
325 int twl6030_mmc_card_detect(struct device *dev, int slot)
327 int ret = -EIO;
328 u8 read_reg = 0;
329 struct platform_device *pdev = to_platform_device(dev);
331 if (pdev->id) {
332 /* TWL6030 provide's Card detect support for
333 * only MMC1 controller.
335 pr_err("Unknown MMC controller %d in %s\n", pdev->id, __func__);
336 return ret;
339 * BIT0 of MMC_CTRL on TWL6030 provides card status for MMC1
340 * 0 - Card not present ,1 - Card present
342 ret = twl_i2c_read_u8(TWL6030_MODULE_ID0, &read_reg,
343 TWL6030_MMCCTRL);
344 if (ret >= 0)
345 ret = read_reg & STS_MMC;
346 return ret;
348 EXPORT_SYMBOL(twl6030_mmc_card_detect);
350 int twl6030_init_irq(struct device *dev, int irq_num)
352 struct device_node *node = dev->of_node;
353 int nr_irqs, irq_base, irq_end;
354 struct task_struct *task;
355 static struct irq_chip twl6030_irq_chip;
356 int status = 0;
357 int i;
358 u8 mask[3];
360 nr_irqs = TWL6030_NR_IRQS;
362 irq_base = irq_alloc_descs(-1, 0, nr_irqs, 0);
363 if (IS_ERR_VALUE(irq_base)) {
364 dev_err(dev, "Fail to allocate IRQ descs\n");
365 return irq_base;
368 irq_domain_add_legacy(node, nr_irqs, irq_base, 0,
369 &irq_domain_simple_ops, NULL);
371 irq_end = irq_base + nr_irqs;
373 mask[0] = 0xFF;
374 mask[1] = 0xFF;
375 mask[2] = 0xFF;
377 /* mask all int lines */
378 twl_i2c_write(TWL_MODULE_PIH, &mask[0], REG_INT_MSK_LINE_A, 3);
379 /* mask all int sts */
380 twl_i2c_write(TWL_MODULE_PIH, &mask[0], REG_INT_MSK_STS_A, 3);
381 /* clear INT_STS_A,B,C */
382 twl_i2c_write(TWL_MODULE_PIH, &mask[0], REG_INT_STS_A, 3);
384 twl6030_irq_base = irq_base;
387 * install an irq handler for each of the modules;
388 * clone dummy irq_chip since PIH can't *do* anything
390 twl6030_irq_chip = dummy_irq_chip;
391 twl6030_irq_chip.name = "twl6030";
392 twl6030_irq_chip.irq_set_type = NULL;
393 twl6030_irq_chip.irq_set_wake = twl6030_irq_set_wake;
395 for (i = irq_base; i < irq_end; i++) {
396 irq_set_chip_and_handler(i, &twl6030_irq_chip,
397 handle_simple_irq);
398 irq_set_chip_data(i, (void *)irq_num);
399 activate_irq(i);
402 dev_info(dev, "PIH (irq %d) chaining IRQs %d..%d\n",
403 irq_num, irq_base, irq_end);
405 /* install an irq handler to demultiplex the TWL6030 interrupt */
406 init_completion(&irq_event);
408 status = request_irq(irq_num, handle_twl6030_pih, 0, "TWL6030-PIH",
409 &irq_event);
410 if (status < 0) {
411 dev_err(dev, "could not claim irq %d: %d\n", irq_num, status);
412 goto fail_irq;
415 task = kthread_run(twl6030_irq_thread, (void *)irq_num, "twl6030-irq");
416 if (IS_ERR(task)) {
417 dev_err(dev, "could not create irq %d thread!\n", irq_num);
418 status = PTR_ERR(task);
419 goto fail_kthread;
422 twl_irq = irq_num;
423 register_pm_notifier(&twl6030_irq_pm_notifier_block);
424 return irq_base;
426 fail_kthread:
427 free_irq(irq_num, &irq_event);
429 fail_irq:
430 for (i = irq_base; i < irq_end; i++)
431 irq_set_chip_and_handler(i, NULL, NULL);
433 return status;
436 int twl6030_exit_irq(void)
438 unregister_pm_notifier(&twl6030_irq_pm_notifier_block);
440 if (twl6030_irq_base) {
441 pr_err("twl6030: can't yet clean up IRQs?\n");
442 return -ENOSYS;
444 return 0;