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/interrupt.h>
36 #include <linux/irq.h>
37 #include <linux/kthread.h>
38 #include <linux/i2c/twl.h>
39 #include <linux/platform_device.h>
44 * TWL6030 (unlike its predecessors, which had two level interrupt handling)
45 * three interrupt registers INT_STS_A, INT_STS_B and INT_STS_C.
46 * It exposes status bits saying who has raised an interrupt. There are
47 * three mask registers that corresponds to these status registers, that
48 * enables/disables these interrupts.
50 * We set up IRQs starting at a platform-specified base. An interrupt map table,
51 * specifies mapping between interrupt number and the associated module.
55 static int twl6030_interrupt_mapping[24] = {
56 PWR_INTR_OFFSET, /* Bit 0 PWRON */
57 PWR_INTR_OFFSET, /* Bit 1 RPWRON */
58 PWR_INTR_OFFSET, /* Bit 2 BAT_VLOW */
59 RTC_INTR_OFFSET, /* Bit 3 RTC_ALARM */
60 RTC_INTR_OFFSET, /* Bit 4 RTC_PERIOD */
61 HOTDIE_INTR_OFFSET, /* Bit 5 HOT_DIE */
62 SMPSLDO_INTR_OFFSET, /* Bit 6 VXXX_SHORT */
63 SMPSLDO_INTR_OFFSET, /* Bit 7 VMMC_SHORT */
65 SMPSLDO_INTR_OFFSET, /* Bit 8 VUSIM_SHORT */
66 BATDETECT_INTR_OFFSET, /* Bit 9 BAT */
67 SIMDETECT_INTR_OFFSET, /* Bit 10 SIM */
68 MMCDETECT_INTR_OFFSET, /* Bit 11 MMC */
69 RSV_INTR_OFFSET, /* Bit 12 Reserved */
70 MADC_INTR_OFFSET, /* Bit 13 GPADC_RT_EOC */
71 MADC_INTR_OFFSET, /* Bit 14 GPADC_SW_EOC */
72 GASGAUGE_INTR_OFFSET, /* Bit 15 CC_AUTOCAL */
74 USBOTG_INTR_OFFSET, /* Bit 16 ID_WKUP */
75 USBOTG_INTR_OFFSET, /* Bit 17 VBUS_WKUP */
76 USBOTG_INTR_OFFSET, /* Bit 18 ID */
77 USB_PRES_INTR_OFFSET, /* Bit 19 VBUS */
78 CHARGER_INTR_OFFSET, /* Bit 20 CHRG_CTRL */
79 CHARGER_INTR_OFFSET, /* Bit 21 EXT_CHRG */
80 CHARGER_INTR_OFFSET, /* Bit 22 INT_CHRG */
81 RSV_INTR_OFFSET, /* Bit 23 Reserved */
83 /*----------------------------------------------------------------------*/
85 static unsigned twl6030_irq_base;
87 static struct completion irq_event;
90 * This thread processes interrupts reported by the Primary Interrupt Handler.
92 static int twl6030_irq_thread(void *data)
94 long irq = (long)data;
95 static unsigned i2c_errors;
96 static const unsigned max_i2c_errors = 100;
99 current->flags |= PF_NOFREEZE;
101 while (!kthread_should_stop()) {
108 /* Wait for IRQ, then read PIH irq status (also blocking) */
109 wait_for_completion_interruptible(&irq_event);
111 /* read INT_STS_A, B and C in one shot using a burst read */
112 ret = twl_i2c_read(TWL_MODULE_PIH, sts.bytes,
115 pr_warning("twl6030: I2C error %d reading PIH ISR\n",
117 if (++i2c_errors >= max_i2c_errors) {
118 printk(KERN_ERR "Maximum I2C error count"
119 " exceeded. Terminating %s.\n",
123 complete(&irq_event);
129 sts.bytes[3] = 0; /* Only 24 bits are valid*/
132 * Since VBUS status bit is not reliable for VBUS disconnect
133 * use CHARGER VBUS detection status bit instead.
135 if (sts.bytes[2] & 0x10)
136 sts.bytes[2] |= 0x08;
138 for (i = 0; sts.int_sts; sts.int_sts >>= 1, i++) {
140 if (sts.int_sts & 0x1) {
141 int module_irq = twl6030_irq_base +
142 twl6030_interrupt_mapping[i];
143 struct irq_desc *d = irq_to_desc(module_irq);
146 pr_err("twl6030: Invalid SIH IRQ: %d\n",
151 /* These can't be masked ... always warn
152 * if we get any surprises.
154 if (d->status & IRQ_DISABLED)
155 note_interrupt(module_irq, d,
158 d->handle_irq(module_irq, d);
163 ret = twl_i2c_write(TWL_MODULE_PIH, sts.bytes,
164 REG_INT_STS_A, 3); /* clear INT_STS_A */
166 pr_warning("twl6030: I2C error in clearing PIH ISR\n");
175 * handle_twl6030_int() is the desc->handle method for the twl6030 interrupt.
176 * This is a chained interrupt, so there is no desc->action method for it.
177 * Now we need to query the interrupt controller in the twl6030 to determine
178 * which module is generating the interrupt request. However, we can't do i2c
179 * transactions in interrupt context, so we must defer that work to a kernel
180 * thread. All we do here is acknowledge and mask the interrupt and wakeup
183 static irqreturn_t handle_twl6030_pih(int irq, void *devid)
185 disable_irq_nosync(irq);
190 /*----------------------------------------------------------------------*/
192 static inline void activate_irq(int irq)
195 /* ARM requires an extra step to clear IRQ_NOREQUEST, which it
196 * sets on behalf of every irq_chip. Also sets IRQ_NOPROBE.
198 set_irq_flags(irq, IRQF_VALID);
200 /* same effect on other architectures */
201 set_irq_noprobe(irq);
205 /*----------------------------------------------------------------------*/
207 static unsigned twl6030_irq_next;
209 /*----------------------------------------------------------------------*/
210 int twl6030_interrupt_unmask(u8 bit_mask, u8 offset)
214 ret = twl_i2c_read_u8(TWL_MODULE_PIH, &unmask_value,
215 REG_INT_STS_A + offset);
216 unmask_value &= (~(bit_mask));
217 ret |= twl_i2c_write_u8(TWL_MODULE_PIH, unmask_value,
218 REG_INT_STS_A + offset); /* unmask INT_MSK_A/B/C */
221 EXPORT_SYMBOL(twl6030_interrupt_unmask);
223 int twl6030_interrupt_mask(u8 bit_mask, u8 offset)
227 ret = twl_i2c_read_u8(TWL_MODULE_PIH, &mask_value,
228 REG_INT_STS_A + offset);
229 mask_value |= (bit_mask);
230 ret |= twl_i2c_write_u8(TWL_MODULE_PIH, mask_value,
231 REG_INT_STS_A + offset); /* mask INT_MSK_A/B/C */
234 EXPORT_SYMBOL(twl6030_interrupt_mask);
236 int twl6030_mmc_card_detect_config(void)
241 /* Unmasking the Card detect Interrupt line for MMC1 from Phoenix */
242 twl6030_interrupt_unmask(TWL6030_MMCDETECT_INT_MASK,
244 twl6030_interrupt_unmask(TWL6030_MMCDETECT_INT_MASK,
247 * Intially Configuring MMC_CTRL for receving interrupts &
248 * Card status on TWL6030 for MMC1
250 ret = twl_i2c_read_u8(TWL6030_MODULE_ID0, ®_val, TWL6030_MMCCTRL);
252 pr_err("twl6030: Failed to read MMCCTRL, error %d\n", ret);
255 reg_val &= ~VMMC_AUTO_OFF;
257 ret = twl_i2c_write_u8(TWL6030_MODULE_ID0, reg_val, TWL6030_MMCCTRL);
259 pr_err("twl6030: Failed to write MMCCTRL, error %d\n", ret);
263 /* Configuring PullUp-PullDown register */
264 ret = twl_i2c_read_u8(TWL6030_MODULE_ID0, ®_val,
265 TWL6030_CFG_INPUT_PUPD3);
267 pr_err("twl6030: Failed to read CFG_INPUT_PUPD3, error %d\n",
271 reg_val &= ~(MMC_PU | MMC_PD);
272 ret = twl_i2c_write_u8(TWL6030_MODULE_ID0, reg_val,
273 TWL6030_CFG_INPUT_PUPD3);
275 pr_err("twl6030: Failed to write CFG_INPUT_PUPD3, error %d\n",
281 EXPORT_SYMBOL(twl6030_mmc_card_detect_config);
283 int twl6030_mmc_card_detect(struct device *dev, int slot)
287 struct platform_device *pdev = to_platform_device(dev);
290 /* TWL6030 provide's Card detect support for
291 * only MMC1 controller.
293 pr_err("Unkown MMC controller %d in %s\n", pdev->id, __func__);
297 * BIT0 of MMC_CTRL on TWL6030 provides card status for MMC1
298 * 0 - Card not present ,1 - Card present
300 ret = twl_i2c_read_u8(TWL6030_MODULE_ID0, &read_reg,
303 ret = read_reg & STS_MMC;
306 EXPORT_SYMBOL(twl6030_mmc_card_detect);
308 int twl6030_init_irq(int irq_num, unsigned irq_base, unsigned irq_end)
313 struct task_struct *task;
317 static struct irq_chip twl6030_irq_chip;
321 ret = twl_i2c_write(TWL_MODULE_PIH, &mask[0],
322 REG_INT_MSK_LINE_A, 3); /* MASK ALL INT LINES */
323 ret = twl_i2c_write(TWL_MODULE_PIH, &mask[0],
324 REG_INT_MSK_STS_A, 3); /* MASK ALL INT STS */
325 ret = twl_i2c_write(TWL_MODULE_PIH, &mask[0],
326 REG_INT_STS_A, 3); /* clear INT_STS_A,B,C */
328 twl6030_irq_base = irq_base;
330 /* install an irq handler for each of the modules;
331 * clone dummy irq_chip since PIH can't *do* anything
333 twl6030_irq_chip = dummy_irq_chip;
334 twl6030_irq_chip.name = "twl6030";
335 twl6030_irq_chip.irq_set_type = NULL;
337 for (i = irq_base; i < irq_end; i++) {
338 set_irq_chip_and_handler(i, &twl6030_irq_chip,
343 twl6030_irq_next = i;
344 pr_info("twl6030: %s (irq %d) chaining IRQs %d..%d\n", "PIH",
345 irq_num, irq_base, twl6030_irq_next - 1);
347 /* install an irq handler to demultiplex the TWL6030 interrupt */
348 init_completion(&irq_event);
349 task = kthread_run(twl6030_irq_thread, (void *)irq_num, "twl6030-irq");
351 pr_err("twl6030: could not create irq %d thread!\n", irq_num);
352 status = PTR_ERR(task);
356 status = request_irq(irq_num, handle_twl6030_pih, IRQF_DISABLED,
357 "TWL6030-PIH", &irq_event);
359 pr_err("twl6030: could not claim irq%d: %d\n", irq_num, status);
364 free_irq(irq_num, &irq_event);
367 for (i = irq_base; i < irq_end; i++)
368 set_irq_chip_and_handler(i, NULL, NULL);
372 int twl6030_exit_irq(void)
375 if (twl6030_irq_base) {
376 pr_err("twl6030: can't yet clean up IRQs?\n");