[deliverable/linux.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 <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];
		u32 int_sts;
	} sts;
	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;

	for (i = 0; sts.int_sts; sts.int_sts >>= 1, i++)
		if (sts.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_get_chip_data(d->irq);

	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);

#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(virq, IRQF_VALID);
#else
	/* same effect on other architectures */
	irq_set_noprobe(virq);
#endif

	return 0;
}

static void twl6030_irq_unmap(struct irq_domain *d, unsigned int virq)
{
#ifdef CONFIG_ARM
	set_irq_flags(virq, 0);
#endif
	irq_set_chip_and_handler(virq, NULL, NULL);
	irq_set_chip_data(virq, NULL);
}

static 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) {
		dev_err(dev, "twl6030_irq: Memory allocation failed\n");
		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;
}
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>
78518ffa BC	42	#include <linux/of.h>
78518ffa BC	43	#include <linux/irqdomain.h>
74d85e47	44	#include <linux/of_device.h>
e8deb28c	45
b0b4a7c2 MK	46	#include "twl-core.h"
b0b4a7c2 MK	47
e8deb28c B	48	/*
	49	* TWL6030 (unlike its predecessors, which had two level interrupt handling)
	50	* three interrupt registers INT_STS_A, INT_STS_B and INT_STS_C.
	51	* It exposes status bits saying who has raised an interrupt. There are
	52	* three mask registers that corresponds to these status registers, that
	53	* enables/disables these interrupts.
	54	*
	55	* We set up IRQs starting at a platform-specified base. An interrupt map table,
	56	* specifies mapping between interrupt number and the associated module.
e8deb28c	57	*/
78518ffa	58	#define TWL6030_NR_IRQS 20
e8deb28c B	59
	60	static int twl6030_interrupt_mapping[24] = {
	61	PWR_INTR_OFFSET, /* Bit 0 PWRON */
	62	PWR_INTR_OFFSET, /* Bit 1 RPWRON */
	63	PWR_INTR_OFFSET, /* Bit 2 BAT_VLOW */
	64	RTC_INTR_OFFSET, /* Bit 3 RTC_ALARM */
	65	RTC_INTR_OFFSET, /* Bit 4 RTC_PERIOD */
	66	HOTDIE_INTR_OFFSET, /* Bit 5 HOT_DIE */
	67	SMPSLDO_INTR_OFFSET, /* Bit 6 VXXX_SHORT */
	68	SMPSLDO_INTR_OFFSET, /* Bit 7 VMMC_SHORT */
	69
	70	SMPSLDO_INTR_OFFSET, /* Bit 8 VUSIM_SHORT */
	71	BATDETECT_INTR_OFFSET, /* Bit 9 BAT */
	72	SIMDETECT_INTR_OFFSET, /* Bit 10 SIM */
	73	MMCDETECT_INTR_OFFSET, /* Bit 11 MMC */
	74	RSV_INTR_OFFSET, /* Bit 12 Reserved */
	75	MADC_INTR_OFFSET, /* Bit 13 GPADC_RT_EOC */
	76	MADC_INTR_OFFSET, /* Bit 14 GPADC_SW_EOC */
	77	GASGAUGE_INTR_OFFSET, /* Bit 15 CC_AUTOCAL */
	78
	79	USBOTG_INTR_OFFSET, /* Bit 16 ID_WKUP */
	80	USBOTG_INTR_OFFSET, /* Bit 17 VBUS_WKUP */
	81	USBOTG_INTR_OFFSET, /* Bit 18 ID */
77b1d3fa	82	USB_PRES_INTR_OFFSET, /* Bit 19 VBUS */
e8deb28c	83	CHARGER_INTR_OFFSET, /* Bit 20 CHRG_CTRL */
6523b148 GG	84	CHARGERFAULT_INTR_OFFSET, /* Bit 21 EXT_CHRG */
6523b148 GG	85	CHARGERFAULT_INTR_OFFSET, /* Bit 22 INT_CHRG */
e8deb28c B	86	RSV_INTR_OFFSET, /* Bit 23 Reserved */
e8deb28c B	87	};
74d85e47 OD	88
	89	static int twl6032_interrupt_mapping[24] = {
	90	PWR_INTR_OFFSET, /* Bit 0 PWRON */
	91	PWR_INTR_OFFSET, /* Bit 1 RPWRON */
	92	PWR_INTR_OFFSET, /* Bit 2 SYS_VLOW */
	93	RTC_INTR_OFFSET, /* Bit 3 RTC_ALARM */
	94	RTC_INTR_OFFSET, /* Bit 4 RTC_PERIOD */
	95	HOTDIE_INTR_OFFSET, /* Bit 5 HOT_DIE */
	96	SMPSLDO_INTR_OFFSET, /* Bit 6 VXXX_SHORT */
	97	PWR_INTR_OFFSET, /* Bit 7 SPDURATION */
	98
	99	PWR_INTR_OFFSET, /* Bit 8 WATCHDOG */
	100	BATDETECT_INTR_OFFSET, /* Bit 9 BAT */
	101	SIMDETECT_INTR_OFFSET, /* Bit 10 SIM */
	102	MMCDETECT_INTR_OFFSET, /* Bit 11 MMC */
	103	MADC_INTR_OFFSET, /* Bit 12 GPADC_RT_EOC */
	104	MADC_INTR_OFFSET, /* Bit 13 GPADC_SW_EOC */
	105	GASGAUGE_INTR_OFFSET, /* Bit 14 CC_EOC */
	106	GASGAUGE_INTR_OFFSET, /* Bit 15 CC_AUTOCAL */
	107
	108	USBOTG_INTR_OFFSET, /* Bit 16 ID_WKUP */
	109	USBOTG_INTR_OFFSET, /* Bit 17 VBUS_WKUP */
	110	USBOTG_INTR_OFFSET, /* Bit 18 ID */
	111	USB_PRES_INTR_OFFSET, /* Bit 19 VBUS */
	112	CHARGER_INTR_OFFSET, /* Bit 20 CHRG_CTRL */
	113	CHARGERFAULT_INTR_OFFSET, /* Bit 21 EXT_CHRG */
	114	CHARGERFAULT_INTR_OFFSET, /* Bit 22 INT_CHRG */
	115	RSV_INTR_OFFSET, /* Bit 23 Reserved */
	116	};
	117
e8deb28c B	118	/----------------------------------------------------------------------/
e8deb28c B	119
0aa8c685 GS	120	struct twl6030_irq {
	121	unsigned int irq_base;
	122	int twl_irq;
	123	bool irq_wake_enabled;
	124	atomic_t wakeirqs;
	125	struct notifier_block pm_nb;
	126	struct irq_chip irq_chip;
	127	struct irq_domain *irq_domain;
74d85e47	128	const int *irq_mapping_tbl;
0aa8c685	129	};
e8deb28c	130
0aa8c685	131	static struct twl6030_irq *twl6030_irq;
ab2b9260 TP	132
	133	static int twl6030_irq_pm_notifier(struct notifier_block *notifier,
	134	unsigned long pm_event, void *unused)
	135	{
	136	int chained_wakeups;
0aa8c685 GS	137	struct twl6030_irq *pdata = container_of(notifier, struct twl6030_irq,
0aa8c685 GS	138	pm_nb);
ab2b9260 TP	139
	140	switch (pm_event) {
	141	case PM_SUSPEND_PREPARE:
0aa8c685	142	chained_wakeups = atomic_read(&pdata->wakeirqs);
ab2b9260	143
0aa8c685 GS	144	if (chained_wakeups && !pdata->irq_wake_enabled) {
0aa8c685 GS	145	if (enable_irq_wake(pdata->twl_irq))
ab2b9260 TP	146	pr_err("twl6030 IRQ wake enable failed\n");
ab2b9260 TP	147	else
0aa8c685 GS	148	pdata->irq_wake_enabled = true;
	149	} else if (!chained_wakeups && pdata->irq_wake_enabled) {
	150	disable_irq_wake(pdata->twl_irq);
	151	pdata->irq_wake_enabled = false;
ab2b9260 TP	152	}
ab2b9260 TP	153
0aa8c685	154	disable_irq(pdata->twl_irq);
ab2b9260	155	break;
782baa20 TP	156
782baa20 TP	157	case PM_POST_SUSPEND:
0aa8c685	158	enable_irq(pdata->twl_irq);
782baa20 TP	159	break;
782baa20 TP	160
ab2b9260 TP	161	default:
	162	break;
	163	}
	164
	165	return NOTIFY_DONE;
	166	}
	167
e8deb28c	168	/*
87343e53 NVS	169	* Threaded irq handler for the twl6030 interrupt.
	170	* We query the interrupt controller in the twl6030 to determine
	171	* which module is generating the interrupt request and call
	172	* handle_nested_irq for that module.
	173	*/
	174	static irqreturn_t twl6030_irq_thread(int irq, void *data)
e8deb28c	175	{
87343e53 NVS	176	int i, ret;
87343e53 NVS	177	union {
e8deb28c B	178	u8 bytes[4];
e8deb28c B	179	u32 int_sts;
87343e53	180	} sts;
0aa8c685	181	struct twl6030_irq *pdata = data;
e8deb28c	182
87343e53 NVS	183	/* read INT_STS_A, B and C in one shot using a burst read */
	184	ret = twl_i2c_read(TWL_MODULE_PIH, sts.bytes, REG_INT_STS_A, 3);
	185	if (ret) {
	186	pr_warn("twl6030_irq: I2C error %d reading PIH ISR\n", ret);
	187	return IRQ_HANDLED;
	188	}
e8deb28c	189
87343e53	190	sts.bytes[3] = 0; /* Only 24 bits are valid*/
e8deb28c	191
87343e53 NVS	192	/*
	193	* Since VBUS status bit is not reliable for VBUS disconnect
	194	* use CHARGER VBUS detection status bit instead.
	195	*/
	196	if (sts.bytes[2] & 0x10)
	197	sts.bytes[2] \|= 0x08;
77b1d3fa	198
87343e53 NVS	199	for (i = 0; sts.int_sts; sts.int_sts >>= 1, i++)
87343e53 NVS	200	if (sts.int_sts & 0x1) {
b32408f6	201	int module_irq =
0aa8c685	202	irq_find_mapping(pdata->irq_domain,
74d85e47	203	pdata->irq_mapping_tbl[i]);
b32408f6 GS	204	if (module_irq)
	205	handle_nested_irq(module_irq);
	206	else
	207	pr_err("twl6030_irq: Unmapped PIH ISR %u detected\n",
	208	i);
87343e53 NVS	209	pr_debug("twl6030_irq: PIH ISR %u, virq%u\n",
87343e53 NVS	210	i, module_irq);
e8deb28c	211	}
3f8349e6	212
87343e53 NVS	213	/*
	214	* NOTE:
	215	* Simulation confirms that documentation is wrong w.r.t the
	216	* interrupt status clear operation. A single byte write to
	217	* any one of STS_A to STS_C register results in all three
	218	* STS registers being reset. Since it does not matter which
	219	* value is written, all three registers are cleared on a
	220	* single byte write, so we just use 0x0 to clear.
	221	*/
	222	ret = twl_i2c_write_u8(TWL_MODULE_PIH, 0x00, REG_INT_STS_A);
	223	if (ret)
	224	pr_warn("twl6030_irq: I2C error in clearing PIH ISR\n");
e8deb28c	225
e8deb28c B	226	return IRQ_HANDLED;
	227	}
	228
	229	/----------------------------------------------------------------------/
	230
b8b8d793	231	static int twl6030_irq_set_wake(struct irq_data *d, unsigned int on)
49dcd070	232	{
0aa8c685 GS	233	struct twl6030_irq *pdata = irq_get_chip_data(d->irq);
0aa8c685 GS	234
ab2b9260	235	if (on)
0aa8c685	236	atomic_inc(&pdata->wakeirqs);
ab2b9260	237	else
0aa8c685	238	atomic_dec(&pdata->wakeirqs);
49dcd070	239
ab2b9260	240	return 0;
49dcd070 SS	241	}
49dcd070 SS	242
e8deb28c B	243	int twl6030_interrupt_unmask(u8 bit_mask, u8 offset)
	244	{
	245	int ret;
	246	u8 unmask_value;
	247	ret = twl_i2c_read_u8(TWL_MODULE_PIH, &unmask_value,
	248	REG_INT_STS_A + offset);
	249	unmask_value &= (~(bit_mask));
	250	ret \|= twl_i2c_write_u8(TWL_MODULE_PIH, unmask_value,
	251	REG_INT_STS_A + offset); /* unmask INT_MSK_A/B/C */
	252	return ret;
	253	}
	254	EXPORT_SYMBOL(twl6030_interrupt_unmask);
	255
	256	int twl6030_interrupt_mask(u8 bit_mask, u8 offset)
	257	{
	258	int ret;
	259	u8 mask_value;
	260	ret = twl_i2c_read_u8(TWL_MODULE_PIH, &mask_value,
	261	REG_INT_STS_A + offset);
	262	mask_value \|= (bit_mask);
	263	ret \|= twl_i2c_write_u8(TWL_MODULE_PIH, mask_value,
	264	REG_INT_STS_A + offset); /* mask INT_MSK_A/B/C */
	265	return ret;
	266	}
	267	EXPORT_SYMBOL(twl6030_interrupt_mask);
	268
72f2e2c7	269	int twl6030_mmc_card_detect_config(void)
	270	{
	271	int ret;
	272	u8 reg_val = 0;
	273
	274	/* Unmasking the Card detect Interrupt line for MMC1 from Phoenix */
	275	twl6030_interrupt_unmask(TWL6030_MMCDETECT_INT_MASK,
	276	REG_INT_MSK_LINE_B);
	277	twl6030_interrupt_unmask(TWL6030_MMCDETECT_INT_MASK,
	278	REG_INT_MSK_STS_B);
	279	/*
25985edc	280	* Initially Configuring MMC_CTRL for receiving interrupts &
72f2e2c7	281	* Card status on TWL6030 for MMC1
	282	*/
	283	ret = twl_i2c_read_u8(TWL6030_MODULE_ID0, &reg_val, TWL6030_MMCCTRL);
	284	if (ret < 0) {
	285	pr_err("twl6030: Failed to read MMCCTRL, error %d\n", ret);
	286	return ret;
	287	}
	288	reg_val &= ~VMMC_AUTO_OFF;
	289	reg_val \|= SW_FC;
	290	ret = twl_i2c_write_u8(TWL6030_MODULE_ID0, reg_val, TWL6030_MMCCTRL);
	291	if (ret < 0) {
	292	pr_err("twl6030: Failed to write MMCCTRL, error %d\n", ret);
	293	return ret;
	294	}
	295
	296	/* Configuring PullUp-PullDown register */
	297	ret = twl_i2c_read_u8(TWL6030_MODULE_ID0, &reg_val,
	298	TWL6030_CFG_INPUT_PUPD3);
	299	if (ret < 0) {
	300	pr_err("twl6030: Failed to read CFG_INPUT_PUPD3, error %d\n",
	301	ret);
	302	return ret;
	303	}
	304	reg_val &= ~(MMC_PU \| MMC_PD);
	305	ret = twl_i2c_write_u8(TWL6030_MODULE_ID0, reg_val,
	306	TWL6030_CFG_INPUT_PUPD3);
	307	if (ret < 0) {
	308	pr_err("twl6030: Failed to write CFG_INPUT_PUPD3, error %d\n",
	309	ret);
	310	return ret;
	311	}
bdd61bc6	312
0aa8c685 GS	313	return irq_find_mapping(twl6030_irq->irq_domain,
0aa8c685 GS	314	MMCDETECT_INTR_OFFSET);
72f2e2c7	315	}
	316	EXPORT_SYMBOL(twl6030_mmc_card_detect_config);
	317
	318	int twl6030_mmc_card_detect(struct device *dev, int slot)
	319	{
	320	int ret = -EIO;
	321	u8 read_reg = 0;
	322	struct platform_device *pdev = to_platform_device(dev);
	323
	324	if (pdev->id) {
	325	/* TWL6030 provide's Card detect support for
	326	* only MMC1 controller.
	327	*/
25985edc	328	pr_err("Unknown MMC controller %d in %s\n", pdev->id, __func__);
72f2e2c7	329	return ret;
	330	}
	331	/*
	332	* BIT0 of MMC_CTRL on TWL6030 provides card status for MMC1
	333	* 0 - Card not present ,1 - Card present
	334	*/
	335	ret = twl_i2c_read_u8(TWL6030_MODULE_ID0, &read_reg,
	336	TWL6030_MMCCTRL);
	337	if (ret >= 0)
	338	ret = read_reg & STS_MMC;
	339	return ret;
	340	}
	341	EXPORT_SYMBOL(twl6030_mmc_card_detect);
	342
b32408f6 GS	343	static int twl6030_irq_map(struct irq_domain *d, unsigned int virq,
	344	irq_hw_number_t hwirq)
	345	{
0aa8c685 GS	346	struct twl6030_irq *pdata = d->host_data;
	347
	348	irq_set_chip_data(virq, pdata);
	349	irq_set_chip_and_handler(virq, &pdata->irq_chip, handle_simple_irq);
b32408f6	350	irq_set_nested_thread(virq, true);
0aa8c685	351	irq_set_parent(virq, pdata->twl_irq);
b32408f6 GS	352
	353	#ifdef CONFIG_ARM
	354	/*
	355	* ARM requires an extra step to clear IRQ_NOREQUEST, which it
	356	* sets on behalf of every irq_chip. Also sets IRQ_NOPROBE.
	357	*/
	358	set_irq_flags(virq, IRQF_VALID);
	359	#else
	360	/* same effect on other architectures */
	361	irq_set_noprobe(virq);
	362	#endif
	363
	364	return 0;
	365	}
	366
	367	static void twl6030_irq_unmap(struct irq_domain *d, unsigned int virq)
	368	{
	369	#ifdef CONFIG_ARM
	370	set_irq_flags(virq, 0);
	371	#endif
	372	irq_set_chip_and_handler(virq, NULL, NULL);
	373	irq_set_chip_data(virq, NULL);
	374	}
	375
	376	static struct irq_domain_ops twl6030_irq_domain_ops = {
	377	.map = twl6030_irq_map,
	378	.unmap = twl6030_irq_unmap,
	379	.xlate = irq_domain_xlate_onetwocell,
	380	};
	381
74d85e47 OD	382	static const struct of_device_id twl6030_of_match[] = {
	383	{.compatible = "ti,twl6030", &twl6030_interrupt_mapping},
	384	{.compatible = "ti,twl6032", &twl6032_interrupt_mapping},
	385	{ },
	386	};
	387
78518ffa	388	int twl6030_init_irq(struct device *dev, int irq_num)
e8deb28c	389	{
78518ffa	390	struct device_node *node = dev->of_node;
b32408f6	391	int nr_irqs;
a820e568	392	int status;
14591d88	393	u8 mask[3];
74d85e47 OD	394	const struct of_device_id *of_id;
	395
	396	of_id = of_match_device(twl6030_of_match, dev);
	397	if (!of_id \|\| !of_id->data) {
	398	dev_err(dev, "Unknown TWL device model\n");
	399	return -EINVAL;
	400	}
78518ffa BC	401
	402	nr_irqs = TWL6030_NR_IRQS;
	403
0aa8c685 GS	404	twl6030_irq = devm_kzalloc(dev, sizeof(*twl6030_irq), GFP_KERNEL);
	405	if (!twl6030_irq) {
	406	dev_err(dev, "twl6030_irq: Memory allocation failed\n");
	407	return -ENOMEM;
	408	}
	409
14591d88	410	mask[0] = 0xFF;
e8deb28c B	411	mask[1] = 0xFF;
e8deb28c B	412	mask[2] = 0xFF;
ec1a07b3 BC	413
ec1a07b3 BC	414	/* mask all int lines */
a820e568	415	status = twl_i2c_write(TWL_MODULE_PIH, &mask[0], REG_INT_MSK_LINE_A, 3);
ec1a07b3	416	/* mask all int sts */
a820e568	417	status \|= twl_i2c_write(TWL_MODULE_PIH, &mask[0], REG_INT_MSK_STS_A, 3);
ec1a07b3	418	/* clear INT_STS_A,B,C */
a820e568 GS	419	status \|= twl_i2c_write(TWL_MODULE_PIH, &mask[0], REG_INT_STS_A, 3);
	420
	421	if (status < 0) {
	422	dev_err(dev, "I2C err writing TWL_MODULE_PIH: %d\n", status);
	423	return status;
	424	}
e8deb28c	425
ec1a07b3 BC	426	/*
ec1a07b3 BC	427	* install an irq handler for each of the modules;
e8deb28c B	428	* clone dummy irq_chip since PIH can't do anything
e8deb28c B	429	*/
0aa8c685 GS	430	twl6030_irq->irq_chip = dummy_irq_chip;
	431	twl6030_irq->irq_chip.name = "twl6030";
	432	twl6030_irq->irq_chip.irq_set_type = NULL;
	433	twl6030_irq->irq_chip.irq_set_wake = twl6030_irq_set_wake;
	434
	435	twl6030_irq->pm_nb.notifier_call = twl6030_irq_pm_notifier;
	436	atomic_set(&twl6030_irq->wakeirqs, 0);
74d85e47	437	twl6030_irq->irq_mapping_tbl = of_id->data;
0aa8c685 GS	438
	439	twl6030_irq->irq_domain =
	440	irq_domain_add_linear(node, nr_irqs,
	441	&twl6030_irq_domain_ops, twl6030_irq);
	442	if (!twl6030_irq->irq_domain) {
b32408f6 GS	443	dev_err(dev, "Can't add irq_domain\n");
b32408f6 GS	444	return -ENOMEM;
e8deb28c B	445	}
e8deb28c B	446
b32408f6	447	dev_info(dev, "PIH (irq %d) nested IRQs\n", irq_num);
e8deb28c B	448
e8deb28c B	449	/* install an irq handler to demultiplex the TWL6030 interrupt */
87343e53	450	status = request_threaded_irq(irq_num, NULL, twl6030_irq_thread,
0aa8c685	451	IRQF_ONESHOT, "TWL6030-PIH", twl6030_irq);
e8deb28c	452	if (status < 0) {
ec1a07b3	453	dev_err(dev, "could not claim irq %d: %d\n", irq_num, status);
e8deb28c B	454	goto fail_irq;
e8deb28c B	455	}
862de70c	456
0aa8c685 GS	457	twl6030_irq->twl_irq = irq_num;
0aa8c685 GS	458	register_pm_notifier(&twl6030_irq->pm_nb);
b32408f6	459	return 0;
e8deb28c	460
862de70c	461	fail_irq:
0aa8c685	462	irq_domain_remove(twl6030_irq->irq_domain);
e8deb28c B	463	return status;
	464	}
	465
	466	int twl6030_exit_irq(void)
	467	{
0aa8c685 GS	468	if (twl6030_irq && twl6030_irq->twl_irq) {
	469	unregister_pm_notifier(&twl6030_irq->pm_nb);
	470	free_irq(twl6030_irq->twl_irq, NULL);
b32408f6 GS	471	/*
	472	* TODO: IRQ domain and allocated nested IRQ descriptors
	473	* should be freed somehow here. Now It can't be done, because
	474	* child devices will not be deleted during removing of
	475	* TWL Core driver and they will still contain allocated
	476	* virt IRQs in their Resources tables.
	477	* The same prevents us from using devm_request_threaded_irq()
	478	* in this module.
	479	*/
e8deb28c B	480	}
	481	return 0;
	482	}
	483