drivers/mfd/twl6030-irq.c - linux - Git at Google

 // 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/suspend.h>
 #include <linux/of.h>
 #include <linux/irqdomain.h>
 #include <linux/of_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.
  */
 #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[] = {
 	{.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 struct of_device_id *of_id;

 	of_id = of_match_device(twl6030_of_match, dev);
 	if (!of_id || !of_id->data) {
 		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 = of_id->data;

 	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;
 }

 int 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.
 		 */
 	}
 	return 0;
 }
	// 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/suspend.h>
	#include <linux/of.h>
	#include <linux/irqdomain.h>
	#include <linux/of_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.
	*/
	#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[] = {
	{.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 struct of_device_id *of_id;

	of_id = of_match_device(twl6030_of_match, dev);
	if (!of_id \|\| !of_id->data) {
	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 = of_id->data;

	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;
	}

	int 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.
	*/
	}
	return 0;
	}