[linux-2.6-block.git] / drivers / mfd / twl6030-irq.c

/*
 * 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/export.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/kthread.h>
#include <linux/i2c/twl.h>
#include <linux/platform_device.h>
#include <linux/suspend.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		*/
	CHARGERFAULT_INTR_OFFSET,	/* Bit 21	EXT_CHRG	*/
	CHARGERFAULT_INTR_OFFSET,	/* Bit 22	INT_CHRG	*/
	RSV_INTR_OFFSET,	/* Bit 23	Reserved		*/
};
/*----------------------------------------------------------------------*/

static unsigned twl6030_irq_base;
static int twl_irq;
static bool twl_irq_wake_enabled;

static struct completion irq_event;
static atomic_t twl6030_wakeirqs = ATOMIC_INIT(0);

static int twl6030_irq_pm_notifier(struct notifier_block *notifier,
				   unsigned long pm_event, void *unused)
{
	int chained_wakeups;

	switch (pm_event) {
	case PM_SUSPEND_PREPARE:
		chained_wakeups = atomic_read(&twl6030_wakeirqs);

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

		disable_irq(twl_irq);
		break;

	case PM_POST_SUSPEND:
		enable_irq(twl_irq);
		break;

	default:
		break;
	}

	return NOTIFY_DONE;
}

static struct notifier_block twl6030_irq_pm_notifier_block = {
	.notifier_call = twl6030_irq_pm_notifier,
};

/*
 * 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];
				generic_handle_irq(module_irq);

			}
		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 */
	irq_set_noprobe(irq);
#endif
}

int twl6030_irq_set_wake(struct irq_data *d, unsigned int on)
{
	if (on)
		atomic_inc(&twl6030_wakeirqs);
	else
		atomic_dec(&twl6030_wakeirqs);

	return 0;
}

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

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);
	/*
	 * 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 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("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);

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;
	twl6030_irq_chip.irq_set_wake = twl6030_irq_set_wake;

	for (i = irq_base; i < irq_end; i++) {
		irq_set_chip_and_handler(i, &twl6030_irq_chip,
					 handle_simple_irq);
		irq_set_chip_data(i, (void *)irq_num);
		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);

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

	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;
	}

	twl_irq = irq_num;
	register_pm_notifier(&twl6030_irq_pm_notifier_block);
	return status;

fail_kthread:
	free_irq(irq_num, &irq_event);

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

int twl6030_exit_irq(void)
{
	unregister_pm_notifier(&twl6030_irq_pm_notifier_block);

	if (twl6030_irq_base) {
		pr_err("twl6030: can't yet clean up IRQs?\n");
		return -ENOSYS;
	}
	return 0;
}
Commit	Line	Data
e8deb28c B	1	/*
	2	* twl6030-irq.c - TWL6030 irq support
	3	*
	4	* Copyright (C) 2005-2009 Texas Instruments, Inc.
	5	*
	6	* Modifications to defer interrupt handling to a kernel thread:
	7	* Copyright (C) 2006 MontaVista Software, Inc.
	8	*
	9	* Based on tlv320aic23.c:
	10	* Copyright (c) by Kai Svahn <kai.svahn@nokia.com>
	11	*
	12	* Code cleanup and modifications to IRQ handler.
	13	* by syed khasim <x0khasim@ti.com>
	14	*
	15	* TWL6030 specific code and IRQ handling changes by
	16	* Jagadeesh Bhaskar Pakaravoor <j-pakaravoor@ti.com>
	17	* Balaji T K <balajitk@ti.com>
	18	*
	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.
	23	*
	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.
	28	*
	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
	32	*/
	33
	34	#include <linux/init.h>
5d4a357d	35	#include <linux/export.h>
e8deb28c B	36	#include <linux/interrupt.h>
	37	#include <linux/irq.h>
	38	#include <linux/kthread.h>
	39	#include <linux/i2c/twl.h>
72f2e2c7	40	#include <linux/platform_device.h>
ab2b9260	41	#include <linux/suspend.h>
e8deb28c	42
b0b4a7c2 MK	43	#include "twl-core.h"
b0b4a7c2 MK	44
e8deb28c B	45	/*
	46	* TWL6030 (unlike its predecessors, which had two level interrupt handling)
	47	* three interrupt registers INT_STS_A, INT_STS_B and INT_STS_C.
	48	* It exposes status bits saying who has raised an interrupt. There are
	49	* three mask registers that corresponds to these status registers, that
	50	* enables/disables these interrupts.
	51	*
	52	* We set up IRQs starting at a platform-specified base. An interrupt map table,
	53	* specifies mapping between interrupt number and the associated module.
	54	*
	55	*/
	56
	57	static int twl6030_interrupt_mapping[24] = {
	58	PWR_INTR_OFFSET, /* Bit 0 PWRON */
	59	PWR_INTR_OFFSET, /* Bit 1 RPWRON */
	60	PWR_INTR_OFFSET, /* Bit 2 BAT_VLOW */
	61	RTC_INTR_OFFSET, /* Bit 3 RTC_ALARM */
	62	RTC_INTR_OFFSET, /* Bit 4 RTC_PERIOD */
	63	HOTDIE_INTR_OFFSET, /* Bit 5 HOT_DIE */
	64	SMPSLDO_INTR_OFFSET, /* Bit 6 VXXX_SHORT */
	65	SMPSLDO_INTR_OFFSET, /* Bit 7 VMMC_SHORT */
	66
	67	SMPSLDO_INTR_OFFSET, /* Bit 8 VUSIM_SHORT */
	68	BATDETECT_INTR_OFFSET, /* Bit 9 BAT */
	69	SIMDETECT_INTR_OFFSET, /* Bit 10 SIM */
	70	MMCDETECT_INTR_OFFSET, /* Bit 11 MMC */
	71	RSV_INTR_OFFSET, /* Bit 12 Reserved */
	72	MADC_INTR_OFFSET, /* Bit 13 GPADC_RT_EOC */
	73	MADC_INTR_OFFSET, /* Bit 14 GPADC_SW_EOC */
	74	GASGAUGE_INTR_OFFSET, /* Bit 15 CC_AUTOCAL */
	75
	76	USBOTG_INTR_OFFSET, /* Bit 16 ID_WKUP */
	77	USBOTG_INTR_OFFSET, /* Bit 17 VBUS_WKUP */
	78	USBOTG_INTR_OFFSET, /* Bit 18 ID */
77b1d3fa	79	USB_PRES_INTR_OFFSET, /* Bit 19 VBUS */
e8deb28c	80	CHARGER_INTR_OFFSET, /* Bit 20 CHRG_CTRL */
6523b148 GG	81	CHARGERFAULT_INTR_OFFSET, /* Bit 21 EXT_CHRG */
6523b148 GG	82	CHARGERFAULT_INTR_OFFSET, /* Bit 22 INT_CHRG */
e8deb28c B	83	RSV_INTR_OFFSET, /* Bit 23 Reserved */
	84	};
	85	/----------------------------------------------------------------------/
	86
	87	static unsigned twl6030_irq_base;
ab2b9260 TP	88	static int twl_irq;
ab2b9260 TP	89	static bool twl_irq_wake_enabled;
e8deb28c B	90
e8deb28c B	91	static struct completion irq_event;
ab2b9260 TP	92	static atomic_t twl6030_wakeirqs = ATOMIC_INIT(0);
	93
	94	static int twl6030_irq_pm_notifier(struct notifier_block *notifier,
	95	unsigned long pm_event, void *unused)
	96	{
	97	int chained_wakeups;
	98
	99	switch (pm_event) {
	100	case PM_SUSPEND_PREPARE:
	101	chained_wakeups = atomic_read(&twl6030_wakeirqs);
	102
	103	if (chained_wakeups && !twl_irq_wake_enabled) {
	104	if (enable_irq_wake(twl_irq))
	105	pr_err("twl6030 IRQ wake enable failed\n");
	106	else
	107	twl_irq_wake_enabled = true;
	108	} else if (!chained_wakeups && twl_irq_wake_enabled) {
	109	disable_irq_wake(twl_irq);
	110	twl_irq_wake_enabled = false;
	111	}
	112
782baa20	113	disable_irq(twl_irq);
ab2b9260	114	break;
782baa20 TP	115
	116	case PM_POST_SUSPEND:
	117	enable_irq(twl_irq);
	118	break;
	119
ab2b9260 TP	120	default:
	121	break;
	122	}
	123
	124	return NOTIFY_DONE;
	125	}
	126
	127	static struct notifier_block twl6030_irq_pm_notifier_block = {
	128	.notifier_call = twl6030_irq_pm_notifier,
	129	};
e8deb28c B	130
	131	/*
	132	* This thread processes interrupts reported by the Primary Interrupt Handler.
	133	*/
	134	static int twl6030_irq_thread(void *data)
	135	{
	136	long irq = (long)data;
	137	static unsigned i2c_errors;
	138	static const unsigned max_i2c_errors = 100;
	139	int ret;
	140
	141	current->flags \|= PF_NOFREEZE;
	142
	143	while (!kthread_should_stop()) {
	144	int i;
	145	union {
	146	u8 bytes[4];
	147	u32 int_sts;
	148	} sts;
	149
	150	/* Wait for IRQ, then read PIH irq status (also blocking) */
	151	wait_for_completion_interruptible(&irq_event);
	152
	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;
	164	}
	165	complete(&irq_event);
	166	continue;
	167	}
	168
	169
	170
	171	sts.bytes[3] = 0; /* Only 24 bits are valid*/
	172
77b1d3fa HH	173	/*
	174	* Since VBUS status bit is not reliable for VBUS disconnect
	175	* use CHARGER VBUS detection status bit instead.
	176	*/
	177	if (sts.bytes[2] & 0x10)
	178	sts.bytes[2] \|= 0x08;
	179
e8deb28c B	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];
c22435a3	185	generic_handle_irq(module_irq);
e8deb28c B	186
	187	}
	188	local_irq_enable();
	189	}
	190	ret = twl_i2c_write(TWL_MODULE_PIH, sts.bytes,
	191	REG_INT_STS_A, 3); /* clear INT_STS_A */
	192	if (ret)
	193	pr_warning("twl6030: I2C error in clearing PIH ISR\n");
	194
	195	enable_irq(irq);
	196	}
	197
	198	return 0;
	199	}
	200
	201	/*
	202	* handle_twl6030_int() is the desc->handle method for the twl6030 interrupt.
	203	* This is a chained interrupt, so there is no desc->action method for it.
	204	* Now we need to query the interrupt controller in the twl6030 to determine
	205	* which module is generating the interrupt request. However, we can't do i2c
	206	* transactions in interrupt context, so we must defer that work to a kernel
	207	* thread. All we do here is acknowledge and mask the interrupt and wakeup
	208	* the kernel thread.
	209	*/
	210	static irqreturn_t handle_twl6030_pih(int irq, void *devid)
	211	{
	212	disable_irq_nosync(irq);
	213	complete(devid);
	214	return IRQ_HANDLED;
	215	}
	216
	217	/----------------------------------------------------------------------/
	218
	219	static inline void activate_irq(int irq)
	220	{
	221	#ifdef CONFIG_ARM
	222	/* ARM requires an extra step to clear IRQ_NOREQUEST, which it
	223	* sets on behalf of every irq_chip. Also sets IRQ_NOPROBE.
	224	*/
	225	set_irq_flags(irq, IRQF_VALID);
	226	#else
	227	/* same effect on other architectures */
d5bb1221	228	irq_set_noprobe(irq);
e8deb28c B	229	#endif
	230	}
	231
49dcd070 SS	232	int twl6030_irq_set_wake(struct irq_data *d, unsigned int on)
49dcd070 SS	233	{
ab2b9260 TP	234	if (on)
	235	atomic_inc(&twl6030_wakeirqs);
	236	else
	237	atomic_dec(&twl6030_wakeirqs);
49dcd070	238
ab2b9260	239	return 0;
49dcd070 SS	240	}
49dcd070 SS	241
e8deb28c B	242	/----------------------------------------------------------------------/
	243
	244	static unsigned twl6030_irq_next;
	245
	246	/----------------------------------------------------------------------/
	247	int twl6030_interrupt_unmask(u8 bit_mask, u8 offset)
	248	{
	249	int ret;
	250	u8 unmask_value;
	251	ret = twl_i2c_read_u8(TWL_MODULE_PIH, &unmask_value,
	252	REG_INT_STS_A + offset);
	253	unmask_value &= (~(bit_mask));
	254	ret \|= twl_i2c_write_u8(TWL_MODULE_PIH, unmask_value,
	255	REG_INT_STS_A + offset); /* unmask INT_MSK_A/B/C */
	256	return ret;
	257	}
	258	EXPORT_SYMBOL(twl6030_interrupt_unmask);
	259
	260	int twl6030_interrupt_mask(u8 bit_mask, u8 offset)
	261	{
	262	int ret;
	263	u8 mask_value;
	264	ret = twl_i2c_read_u8(TWL_MODULE_PIH, &mask_value,
	265	REG_INT_STS_A + offset);
	266	mask_value \|= (bit_mask);
	267	ret \|= twl_i2c_write_u8(TWL_MODULE_PIH, mask_value,
	268	REG_INT_STS_A + offset); /* mask INT_MSK_A/B/C */
	269	return ret;
	270	}
	271	EXPORT_SYMBOL(twl6030_interrupt_mask);
	272
72f2e2c7	273	int twl6030_mmc_card_detect_config(void)
	274	{
	275	int ret;
	276	u8 reg_val = 0;
	277
	278	/* Unmasking the Card detect Interrupt line for MMC1 from Phoenix */
	279	twl6030_interrupt_unmask(TWL6030_MMCDETECT_INT_MASK,
	280	REG_INT_MSK_LINE_B);
	281	twl6030_interrupt_unmask(TWL6030_MMCDETECT_INT_MASK,
	282	REG_INT_MSK_STS_B);
	283	/*
25985edc	284	* Initially Configuring MMC_CTRL for receiving interrupts &
72f2e2c7	285	* Card status on TWL6030 for MMC1
	286	*/
	287	ret = twl_i2c_read_u8(TWL6030_MODULE_ID0, &reg_val, TWL6030_MMCCTRL);
	288	if (ret < 0) {
	289	pr_err("twl6030: Failed to read MMCCTRL, error %d\n", ret);
	290	return ret;
	291	}
	292	reg_val &= ~VMMC_AUTO_OFF;
	293	reg_val \|= SW_FC;
	294	ret = twl_i2c_write_u8(TWL6030_MODULE_ID0, reg_val, TWL6030_MMCCTRL);
	295	if (ret < 0) {
	296	pr_err("twl6030: Failed to write MMCCTRL, error %d\n", ret);
	297	return ret;
	298	}
	299
	300	/* Configuring PullUp-PullDown register */
	301	ret = twl_i2c_read_u8(TWL6030_MODULE_ID0, &reg_val,
	302	TWL6030_CFG_INPUT_PUPD3);
	303	if (ret < 0) {
	304	pr_err("twl6030: Failed to read CFG_INPUT_PUPD3, error %d\n",
	305	ret);
	306	return ret;
	307	}
	308	reg_val &= ~(MMC_PU \| MMC_PD);
	309	ret = twl_i2c_write_u8(TWL6030_MODULE_ID0, reg_val,
	310	TWL6030_CFG_INPUT_PUPD3);
	311	if (ret < 0) {
	312	pr_err("twl6030: Failed to write CFG_INPUT_PUPD3, error %d\n",
	313	ret);
	314	return ret;
	315	}
	316	return 0;
	317	}
	318	EXPORT_SYMBOL(twl6030_mmc_card_detect_config);
	319
	320	int twl6030_mmc_card_detect(struct device *dev, int slot)
	321	{
	322	int ret = -EIO;
	323	u8 read_reg = 0;
	324	struct platform_device *pdev = to_platform_device(dev);
	325
	326	if (pdev->id) {
	327	/* TWL6030 provide's Card detect support for
	328	* only MMC1 controller.
	329	*/
25985edc	330	pr_err("Unknown MMC controller %d in %s\n", pdev->id, __func__);
72f2e2c7	331	return ret;
	332	}
	333	/*
	334	* BIT0 of MMC_CTRL on TWL6030 provides card status for MMC1
	335	* 0 - Card not present ,1 - Card present
	336	*/
	337	ret = twl_i2c_read_u8(TWL6030_MODULE_ID0, &read_reg,
	338	TWL6030_MMCCTRL);
	339	if (ret >= 0)
	340	ret = read_reg & STS_MMC;
	341	return ret;
	342	}
	343	EXPORT_SYMBOL(twl6030_mmc_card_detect);
	344
e8deb28c B	345	int twl6030_init_irq(int irq_num, unsigned irq_base, unsigned irq_end)
	346	{
	347
	348	int status = 0;
	349	int i;
	350	struct task_struct *task;
	351	int ret;
	352	u8 mask[4];
	353
	354	static struct irq_chip twl6030_irq_chip;
	355	mask[1] = 0xFF;
	356	mask[2] = 0xFF;
	357	mask[3] = 0xFF;
	358	ret = twl_i2c_write(TWL_MODULE_PIH, &mask[0],
	359	REG_INT_MSK_LINE_A, 3); /* MASK ALL INT LINES */
	360	ret = twl_i2c_write(TWL_MODULE_PIH, &mask[0],
	361	REG_INT_MSK_STS_A, 3); /* MASK ALL INT STS */
	362	ret = twl_i2c_write(TWL_MODULE_PIH, &mask[0],
	363	REG_INT_STS_A, 3); /* clear INT_STS_A,B,C */
	364
	365	twl6030_irq_base = irq_base;
	366
	367	/* install an irq handler for each of the modules;
	368	* clone dummy irq_chip since PIH can't do anything
	369	*/
	370	twl6030_irq_chip = dummy_irq_chip;
	371	twl6030_irq_chip.name = "twl6030";
c45c685c	372	twl6030_irq_chip.irq_set_type = NULL;
49dcd070	373	twl6030_irq_chip.irq_set_wake = twl6030_irq_set_wake;
e8deb28c B	374
e8deb28c B	375	for (i = irq_base; i < irq_end; i++) {
d5bb1221 TG	376	irq_set_chip_and_handler(i, &twl6030_irq_chip,
d5bb1221 TG	377	handle_simple_irq);
49dcd070	378	irq_set_chip_data(i, (void *)irq_num);
e8deb28c B	379	activate_irq(i);
	380	}
	381
	382	twl6030_irq_next = i;
	383	pr_info("twl6030: %s (irq %d) chaining IRQs %d..%d\n", "PIH",
	384	irq_num, irq_base, twl6030_irq_next - 1);
	385
	386	/* install an irq handler to demultiplex the TWL6030 interrupt */
	387	init_completion(&irq_event);
e8deb28c	388
f742b96e	389	status = request_irq(irq_num, handle_twl6030_pih, 0,
e8deb28c B	390	"TWL6030-PIH", &irq_event);
	391	if (status < 0) {
	392	pr_err("twl6030: could not claim irq%d: %d\n", irq_num, status);
	393	goto fail_irq;
	394	}
862de70c AL	395
	396	task = kthread_run(twl6030_irq_thread, (void *)irq_num, "twl6030-irq");
	397	if (IS_ERR(task)) {
	398	pr_err("twl6030: could not create irq %d thread!\n", irq_num);
	399	status = PTR_ERR(task);
	400	goto fail_kthread;
	401	}
ab2b9260 TP	402
	403	twl_irq = irq_num;
	404	register_pm_notifier(&twl6030_irq_pm_notifier_block);
e8deb28c	405	return status;
e8deb28c B	406
e8deb28c B	407	fail_kthread:
862de70c AL	408	free_irq(irq_num, &irq_event);
	409
	410	fail_irq:
e8deb28c	411	for (i = irq_base; i < irq_end; i++)
d5bb1221	412	irq_set_chip_and_handler(i, NULL, NULL);
e8deb28c B	413	return status;
	414	}
	415
	416	int twl6030_exit_irq(void)
	417	{
ab2b9260	418	unregister_pm_notifier(&twl6030_irq_pm_notifier_block);
e8deb28c B	419
	420	if (twl6030_irq_base) {
	421	pr_err("twl6030: can't yet clean up IRQs?\n");
	422	return -ENOSYS;
	423	}
	424	return 0;
	425	}
	426