drivers/mfd/intel_soc_pmic_bxtwc.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 /*
  * MFD core driver for Intel Broxton Whiskey Cove PMIC
  *
  * Copyright (C) 2015 Intel Corporation. All rights reserved.
  */

 #include <linux/acpi.h>
 #include <linux/delay.h>
 #include <linux/err.h>
 #include <linux/interrupt.h>
 #include <linux/kernel.h>
 #include <linux/mfd/core.h>
 #include <linux/mfd/intel_soc_pmic.h>
 #include <linux/mfd/intel_soc_pmic_bxtwc.h>
 #include <linux/module.h>

 #include <asm/intel_scu_ipc.h>

 /* PMIC device registers */
 #define REG_ADDR_MASK		0xFF00
 #define REG_ADDR_SHIFT		8
 #define REG_OFFSET_MASK		0xFF

 /* Interrupt Status Registers */
 #define BXTWC_IRQLVL1		0x4E02

 #define BXTWC_PWRBTNIRQ		0x4E03
 #define BXTWC_THRM0IRQ		0x4E04
 #define BXTWC_THRM1IRQ		0x4E05
 #define BXTWC_THRM2IRQ		0x4E06
 #define BXTWC_BCUIRQ		0x4E07
 #define BXTWC_ADCIRQ		0x4E08
 #define BXTWC_CHGR0IRQ		0x4E09
 #define BXTWC_CHGR1IRQ		0x4E0A
 #define BXTWC_GPIOIRQ0		0x4E0B
 #define BXTWC_GPIOIRQ1		0x4E0C
 #define BXTWC_CRITIRQ		0x4E0D
 #define BXTWC_TMUIRQ		0x4FB6

 /* Interrupt MASK Registers */
 #define BXTWC_MIRQLVL1		0x4E0E
 #define BXTWC_MIRQLVL1_MCHGR	BIT(5)

 #define BXTWC_MPWRBTNIRQ	0x4E0F
 #define BXTWC_MTHRM0IRQ		0x4E12
 #define BXTWC_MTHRM1IRQ		0x4E13
 #define BXTWC_MTHRM2IRQ		0x4E14
 #define BXTWC_MBCUIRQ		0x4E15
 #define BXTWC_MADCIRQ		0x4E16
 #define BXTWC_MCHGR0IRQ		0x4E17
 #define BXTWC_MCHGR1IRQ		0x4E18
 #define BXTWC_MGPIO0IRQ		0x4E19
 #define BXTWC_MGPIO1IRQ		0x4E1A
 #define BXTWC_MCRITIRQ		0x4E1B
 #define BXTWC_MTMUIRQ		0x4FB7

 /* Whiskey Cove PMIC share same ACPI ID between different platforms */
 #define BROXTON_PMIC_WC_HRV	4

 #define PMC_PMIC_ACCESS		0xFF
 #define PMC_PMIC_READ		0x0
 #define PMC_PMIC_WRITE		0x1

 enum bxtwc_irqs {
 	BXTWC_PWRBTN_LVL1_IRQ = 0,
 	BXTWC_TMU_LVL1_IRQ,
 	BXTWC_THRM_LVL1_IRQ,
 	BXTWC_BCU_LVL1_IRQ,
 	BXTWC_ADC_LVL1_IRQ,
 	BXTWC_CHGR_LVL1_IRQ,
 	BXTWC_GPIO_LVL1_IRQ,
 	BXTWC_CRIT_LVL1_IRQ,
 };

 enum bxtwc_irqs_pwrbtn {
 	BXTWC_PWRBTN_IRQ = 0,
 	BXTWC_UIBTN_IRQ,
 };

 enum bxtwc_irqs_bcu {
 	BXTWC_BCU_IRQ = 0,
 };

 enum bxtwc_irqs_adc {
 	BXTWC_ADC_IRQ = 0,
 };

 enum bxtwc_irqs_chgr {
 	BXTWC_USBC_IRQ = 0,
 	BXTWC_CHGR0_IRQ,
 	BXTWC_CHGR1_IRQ,
 };

 enum bxtwc_irqs_tmu {
 	BXTWC_TMU_IRQ = 0,
 };

 enum bxtwc_irqs_crit {
 	BXTWC_CRIT_IRQ = 0,
 };

 static const struct regmap_irq bxtwc_regmap_irqs[] = {
 	REGMAP_IRQ_REG(BXTWC_PWRBTN_LVL1_IRQ, 0, BIT(0)),
 	REGMAP_IRQ_REG(BXTWC_TMU_LVL1_IRQ, 0, BIT(1)),
 	REGMAP_IRQ_REG(BXTWC_THRM_LVL1_IRQ, 0, BIT(2)),
 	REGMAP_IRQ_REG(BXTWC_BCU_LVL1_IRQ, 0, BIT(3)),
 	REGMAP_IRQ_REG(BXTWC_ADC_LVL1_IRQ, 0, BIT(4)),
 	REGMAP_IRQ_REG(BXTWC_CHGR_LVL1_IRQ, 0, BIT(5)),
 	REGMAP_IRQ_REG(BXTWC_GPIO_LVL1_IRQ, 0, BIT(6)),
 	REGMAP_IRQ_REG(BXTWC_CRIT_LVL1_IRQ, 0, BIT(7)),
 };

 static const struct regmap_irq bxtwc_regmap_irqs_pwrbtn[] = {
 	REGMAP_IRQ_REG(BXTWC_PWRBTN_IRQ, 0, 0x01),
 };

 static const struct regmap_irq bxtwc_regmap_irqs_bcu[] = {
 	REGMAP_IRQ_REG(BXTWC_BCU_IRQ, 0, 0x1f),
 };

 static const struct regmap_irq bxtwc_regmap_irqs_adc[] = {
 	REGMAP_IRQ_REG(BXTWC_ADC_IRQ, 0, 0xff),
 };

 static const struct regmap_irq bxtwc_regmap_irqs_chgr[] = {
 	REGMAP_IRQ_REG(BXTWC_USBC_IRQ, 0, 0x20),
 	REGMAP_IRQ_REG(BXTWC_CHGR0_IRQ, 0, 0x1f),
 	REGMAP_IRQ_REG(BXTWC_CHGR1_IRQ, 1, 0x1f),
 };

 static const struct regmap_irq bxtwc_regmap_irqs_tmu[] = {
 	REGMAP_IRQ_REG(BXTWC_TMU_IRQ, 0, 0x06),
 };

 static const struct regmap_irq bxtwc_regmap_irqs_crit[] = {
 	REGMAP_IRQ_REG(BXTWC_CRIT_IRQ, 0, 0x03),
 };

 static struct regmap_irq_chip bxtwc_regmap_irq_chip = {
 	.name = "bxtwc_irq_chip",
 	.status_base = BXTWC_IRQLVL1,
 	.mask_base = BXTWC_MIRQLVL1,
 	.irqs = bxtwc_regmap_irqs,
 	.num_irqs = ARRAY_SIZE(bxtwc_regmap_irqs),
 	.num_regs = 1,
 };

 static struct regmap_irq_chip bxtwc_regmap_irq_chip_pwrbtn = {
 	.name = "bxtwc_irq_chip_pwrbtn",
 	.status_base = BXTWC_PWRBTNIRQ,
 	.mask_base = BXTWC_MPWRBTNIRQ,
 	.irqs = bxtwc_regmap_irqs_pwrbtn,
 	.num_irqs = ARRAY_SIZE(bxtwc_regmap_irqs_pwrbtn),
 	.num_regs = 1,
 };

 static struct regmap_irq_chip bxtwc_regmap_irq_chip_tmu = {
 	.name = "bxtwc_irq_chip_tmu",
 	.status_base = BXTWC_TMUIRQ,
 	.mask_base = BXTWC_MTMUIRQ,
 	.irqs = bxtwc_regmap_irqs_tmu,
 	.num_irqs = ARRAY_SIZE(bxtwc_regmap_irqs_tmu),
 	.num_regs = 1,
 };

 static struct regmap_irq_chip bxtwc_regmap_irq_chip_bcu = {
 	.name = "bxtwc_irq_chip_bcu",
 	.status_base = BXTWC_BCUIRQ,
 	.mask_base = BXTWC_MBCUIRQ,
 	.irqs = bxtwc_regmap_irqs_bcu,
 	.num_irqs = ARRAY_SIZE(bxtwc_regmap_irqs_bcu),
 	.num_regs = 1,
 };

 static struct regmap_irq_chip bxtwc_regmap_irq_chip_adc = {
 	.name = "bxtwc_irq_chip_adc",
 	.status_base = BXTWC_ADCIRQ,
 	.mask_base = BXTWC_MADCIRQ,
 	.irqs = bxtwc_regmap_irqs_adc,
 	.num_irqs = ARRAY_SIZE(bxtwc_regmap_irqs_adc),
 	.num_regs = 1,
 };

 static struct regmap_irq_chip bxtwc_regmap_irq_chip_chgr = {
 	.name = "bxtwc_irq_chip_chgr",
 	.status_base = BXTWC_CHGR0IRQ,
 	.mask_base = BXTWC_MCHGR0IRQ,
 	.irqs = bxtwc_regmap_irqs_chgr,
 	.num_irqs = ARRAY_SIZE(bxtwc_regmap_irqs_chgr),
 	.num_regs = 2,
 };

 static struct regmap_irq_chip bxtwc_regmap_irq_chip_crit = {
 	.name = "bxtwc_irq_chip_crit",
 	.status_base = BXTWC_CRITIRQ,
 	.mask_base = BXTWC_MCRITIRQ,
 	.irqs = bxtwc_regmap_irqs_crit,
 	.num_irqs = ARRAY_SIZE(bxtwc_regmap_irqs_crit),
 	.num_regs = 1,
 };

 static const struct resource gpio_resources[] = {
 	DEFINE_RES_IRQ_NAMED(BXTWC_GPIO_LVL1_IRQ, "GPIO"),
 };

 static const struct resource adc_resources[] = {
 	DEFINE_RES_IRQ_NAMED(BXTWC_ADC_IRQ, "ADC"),
 };

 static const struct resource usbc_resources[] = {
 	DEFINE_RES_IRQ(BXTWC_USBC_IRQ),
 };

 static const struct resource charger_resources[] = {
 	DEFINE_RES_IRQ_NAMED(BXTWC_CHGR0_IRQ, "CHARGER"),
 	DEFINE_RES_IRQ_NAMED(BXTWC_CHGR1_IRQ, "CHARGER1"),
 };

 static const struct resource thermal_resources[] = {
 	DEFINE_RES_IRQ(BXTWC_THRM_LVL1_IRQ),
 };

 static const struct resource bcu_resources[] = {
 	DEFINE_RES_IRQ_NAMED(BXTWC_BCU_IRQ, "BCU"),
 };

 static const struct resource tmu_resources[] = {
 	DEFINE_RES_IRQ_NAMED(BXTWC_TMU_IRQ, "TMU"),
 };

 static struct mfd_cell bxt_wc_dev[] = {
 	{
 		.name = "bxt_wcove_gpadc",
 		.num_resources = ARRAY_SIZE(adc_resources),
 		.resources = adc_resources,
 	},
 	{
 		.name = "bxt_wcove_thermal",
 		.num_resources = ARRAY_SIZE(thermal_resources),
 		.resources = thermal_resources,
 	},
 	{
 		.name = "bxt_wcove_usbc",
 		.num_resources = ARRAY_SIZE(usbc_resources),
 		.resources = usbc_resources,
 	},
 	{
 		.name = "bxt_wcove_ext_charger",
 		.num_resources = ARRAY_SIZE(charger_resources),
 		.resources = charger_resources,
 	},
 	{
 		.name = "bxt_wcove_bcu",
 		.num_resources = ARRAY_SIZE(bcu_resources),
 		.resources = bcu_resources,
 	},
 	{
 		.name = "bxt_wcove_tmu",
 		.num_resources = ARRAY_SIZE(tmu_resources),
 		.resources = tmu_resources,
 	},

 	{
 		.name = "bxt_wcove_gpio",
 		.num_resources = ARRAY_SIZE(gpio_resources),
 		.resources = gpio_resources,
 	},
 	{
 		.name = "bxt_wcove_region",
 	},
 };

 static int regmap_ipc_byte_reg_read(void *context, unsigned int reg,
 				    unsigned int *val)
 {
 	int ret;
 	int i2c_addr;
 	u8 ipc_in[2];
 	u8 ipc_out[4];
 	struct intel_soc_pmic *pmic = context;

 	if (!pmic)
 		return -EINVAL;

 	if (reg & REG_ADDR_MASK)
 		i2c_addr = (reg & REG_ADDR_MASK) >> REG_ADDR_SHIFT;
 	else
 		i2c_addr = BXTWC_DEVICE1_ADDR;

 	reg &= REG_OFFSET_MASK;

 	ipc_in[0] = reg;
 	ipc_in[1] = i2c_addr;
 	ret = intel_scu_ipc_dev_command(pmic->scu, PMC_PMIC_ACCESS,
 					PMC_PMIC_READ, ipc_in, sizeof(ipc_in),
 					ipc_out, sizeof(ipc_out));
 	if (ret)
 		return ret;

 	*val = ipc_out[0];

 	return 0;
 }

 static int regmap_ipc_byte_reg_write(void *context, unsigned int reg,
 				       unsigned int val)
 {
 	int i2c_addr;
 	u8 ipc_in[3];
 	struct intel_soc_pmic *pmic = context;

 	if (!pmic)
 		return -EINVAL;

 	if (reg & REG_ADDR_MASK)
 		i2c_addr = (reg & REG_ADDR_MASK) >> REG_ADDR_SHIFT;
 	else
 		i2c_addr = BXTWC_DEVICE1_ADDR;

 	reg &= REG_OFFSET_MASK;

 	ipc_in[0] = reg;
 	ipc_in[1] = i2c_addr;
 	ipc_in[2] = val;
 	return intel_scu_ipc_dev_command(pmic->scu, PMC_PMIC_ACCESS,
 					 PMC_PMIC_WRITE, ipc_in, sizeof(ipc_in),
 					 NULL, 0);
 }

 /* sysfs interfaces to r/w PMIC registers, required by initial script */
 static unsigned long bxtwc_reg_addr;
 static ssize_t addr_show(struct device *dev,
 			 struct device_attribute *attr, char *buf)
 {
 	return sprintf(buf, "0x%lx\n", bxtwc_reg_addr);
 }

 static ssize_t addr_store(struct device *dev,
 			  struct device_attribute *attr, const char *buf, size_t count)
 {
 	if (kstrtoul(buf, 0, &bxtwc_reg_addr)) {
 		dev_err(dev, "Invalid register address\n");
 		return -EINVAL;
 	}
 	return (ssize_t)count;
 }

 static ssize_t val_show(struct device *dev,
 			struct device_attribute *attr, char *buf)
 {
 	int ret;
 	unsigned int val;
 	struct intel_soc_pmic *pmic = dev_get_drvdata(dev);

 	ret = regmap_read(pmic->regmap, bxtwc_reg_addr, &val);
 	if (ret < 0) {
 		dev_err(dev, "Failed to read 0x%lx\n", bxtwc_reg_addr);
 		return -EIO;
 	}

 	return sprintf(buf, "0x%02x\n", val);
 }

 static ssize_t val_store(struct device *dev,
 			 struct device_attribute *attr, const char *buf, size_t count)
 {
 	int ret;
 	unsigned int val;
 	struct intel_soc_pmic *pmic = dev_get_drvdata(dev);

 	ret = kstrtouint(buf, 0, &val);
 	if (ret)
 		return ret;

 	ret = regmap_write(pmic->regmap, bxtwc_reg_addr, val);
 	if (ret) {
 		dev_err(dev, "Failed to write value 0x%02x to address 0x%lx",
 			val, bxtwc_reg_addr);
 		return -EIO;
 	}
 	return count;
 }

 static DEVICE_ATTR_ADMIN_RW(addr);
 static DEVICE_ATTR_ADMIN_RW(val);
 static struct attribute *bxtwc_attrs[] = {
 	&dev_attr_addr.attr,
 	&dev_attr_val.attr,
 	NULL
 };

 static const struct attribute_group bxtwc_group = {
 	.attrs = bxtwc_attrs,
 };

 static const struct regmap_config bxtwc_regmap_config = {
 	.reg_bits = 16,
 	.val_bits = 8,
 	.reg_write = regmap_ipc_byte_reg_write,
 	.reg_read = regmap_ipc_byte_reg_read,
 };

 static int bxtwc_add_chained_irq_chip(struct intel_soc_pmic *pmic,
 				struct regmap_irq_chip_data *pdata,
 				int pirq, int irq_flags,
 				const struct regmap_irq_chip *chip,
 				struct regmap_irq_chip_data **data)
 {
 	int irq;

 	irq = regmap_irq_get_virq(pdata, pirq);
 	if (irq < 0) {
 		dev_err(pmic->dev,
 			"Failed to get parent vIRQ(%d) for chip %s, ret:%d\n",
 			pirq, chip->name, irq);
 		return irq;
 	}

 	return devm_regmap_add_irq_chip(pmic->dev, pmic->regmap, irq, irq_flags,
 					0, chip, data);
 }

 static int bxtwc_probe(struct platform_device *pdev)
 {
 	int ret;
 	acpi_handle handle;
 	acpi_status status;
 	unsigned long long hrv;
 	struct intel_soc_pmic *pmic;

 	handle = ACPI_HANDLE(&pdev->dev);
 	status = acpi_evaluate_integer(handle, "_HRV", NULL, &hrv);
 	if (ACPI_FAILURE(status)) {
 		dev_err(&pdev->dev, "Failed to get PMIC hardware revision\n");
 		return -ENODEV;
 	}
 	if (hrv != BROXTON_PMIC_WC_HRV) {
 		dev_err(&pdev->dev, "Invalid PMIC hardware revision: %llu\n",
 			hrv);
 		return -ENODEV;
 	}

 	pmic = devm_kzalloc(&pdev->dev, sizeof(*pmic), GFP_KERNEL);
 	if (!pmic)
 		return -ENOMEM;

 	ret = platform_get_irq(pdev, 0);
 	if (ret < 0)
 		return ret;
 	pmic->irq = ret;

 	dev_set_drvdata(&pdev->dev, pmic);
 	pmic->dev = &pdev->dev;

 	pmic->scu = devm_intel_scu_ipc_dev_get(&pdev->dev);
 	if (!pmic->scu)
 		return -EPROBE_DEFER;

 	pmic->regmap = devm_regmap_init(&pdev->dev, NULL, pmic,
 					&bxtwc_regmap_config);
 	if (IS_ERR(pmic->regmap)) {
 		ret = PTR_ERR(pmic->regmap);
 		dev_err(&pdev->dev, "Failed to initialise regmap: %d\n", ret);
 		return ret;
 	}

 	ret = devm_regmap_add_irq_chip(&pdev->dev, pmic->regmap, pmic->irq,
 				       IRQF_ONESHOT | IRQF_SHARED,
 				       0, &bxtwc_regmap_irq_chip,
 				       &pmic->irq_chip_data);
 	if (ret) {
 		dev_err(&pdev->dev, "Failed to add IRQ chip\n");
 		return ret;
 	}

 	ret = bxtwc_add_chained_irq_chip(pmic, pmic->irq_chip_data,
 					 BXTWC_PWRBTN_LVL1_IRQ,
 					 IRQF_ONESHOT,
 					 &bxtwc_regmap_irq_chip_pwrbtn,
 					 &pmic->irq_chip_data_pwrbtn);
 	if (ret) {
 		dev_err(&pdev->dev, "Failed to add PWRBTN IRQ chip\n");
 		return ret;
 	}

 	ret = bxtwc_add_chained_irq_chip(pmic, pmic->irq_chip_data,
 					 BXTWC_TMU_LVL1_IRQ,
 					 IRQF_ONESHOT,
 					 &bxtwc_regmap_irq_chip_tmu,
 					 &pmic->irq_chip_data_tmu);
 	if (ret) {
 		dev_err(&pdev->dev, "Failed to add TMU IRQ chip\n");
 		return ret;
 	}

 	/* Add chained IRQ handler for BCU IRQs */
 	ret = bxtwc_add_chained_irq_chip(pmic, pmic->irq_chip_data,
 					 BXTWC_BCU_LVL1_IRQ,
 					 IRQF_ONESHOT,
 					 &bxtwc_regmap_irq_chip_bcu,
 					 &pmic->irq_chip_data_bcu);


 	if (ret) {
 		dev_err(&pdev->dev, "Failed to add BUC IRQ chip\n");
 		return ret;
 	}

 	/* Add chained IRQ handler for ADC IRQs */
 	ret = bxtwc_add_chained_irq_chip(pmic, pmic->irq_chip_data,
 					 BXTWC_ADC_LVL1_IRQ,
 					 IRQF_ONESHOT,
 					 &bxtwc_regmap_irq_chip_adc,
 					 &pmic->irq_chip_data_adc);


 	if (ret) {
 		dev_err(&pdev->dev, "Failed to add ADC IRQ chip\n");
 		return ret;
 	}

 	/* Add chained IRQ handler for CHGR IRQs */
 	ret = bxtwc_add_chained_irq_chip(pmic, pmic->irq_chip_data,
 					 BXTWC_CHGR_LVL1_IRQ,
 					 IRQF_ONESHOT,
 					 &bxtwc_regmap_irq_chip_chgr,
 					 &pmic->irq_chip_data_chgr);


 	if (ret) {
 		dev_err(&pdev->dev, "Failed to add CHGR IRQ chip\n");
 		return ret;
 	}

 	/* Add chained IRQ handler for CRIT IRQs */
 	ret = bxtwc_add_chained_irq_chip(pmic, pmic->irq_chip_data,
 					 BXTWC_CRIT_LVL1_IRQ,
 					 IRQF_ONESHOT,
 					 &bxtwc_regmap_irq_chip_crit,
 					 &pmic->irq_chip_data_crit);


 	if (ret) {
 		dev_err(&pdev->dev, "Failed to add CRIT IRQ chip\n");
 		return ret;
 	}

 	ret = devm_mfd_add_devices(&pdev->dev, PLATFORM_DEVID_NONE, bxt_wc_dev,
 				   ARRAY_SIZE(bxt_wc_dev), NULL, 0, NULL);
 	if (ret) {
 		dev_err(&pdev->dev, "Failed to add devices\n");
 		return ret;
 	}

 	ret = sysfs_create_group(&pdev->dev.kobj, &bxtwc_group);
 	if (ret) {
 		dev_err(&pdev->dev, "Failed to create sysfs group %d\n", ret);
 		return ret;
 	}

 	/*
 	 * There is known hw bug. Upon reset BIT 5 of register
 	 * BXTWC_CHGR_LVL1_IRQ is 0 which is the expected value. However,
 	 * later it's set to 1(masked) automatically by hardware. So we
 	 * have the software workaround here to unmaksed it in order to let
 	 * charger interrutp work.
 	 */
 	regmap_update_bits(pmic->regmap, BXTWC_MIRQLVL1,
 				BXTWC_MIRQLVL1_MCHGR, 0);

 	return 0;
 }

 static int bxtwc_remove(struct platform_device *pdev)
 {
 	sysfs_remove_group(&pdev->dev.kobj, &bxtwc_group);

 	return 0;
 }

 static void bxtwc_shutdown(struct platform_device *pdev)
 {
 	struct intel_soc_pmic *pmic = dev_get_drvdata(&pdev->dev);

 	disable_irq(pmic->irq);
 }

 #ifdef CONFIG_PM_SLEEP
 static int bxtwc_suspend(struct device *dev)
 {
 	struct intel_soc_pmic *pmic = dev_get_drvdata(dev);

 	disable_irq(pmic->irq);

 	return 0;
 }

 static int bxtwc_resume(struct device *dev)
 {
 	struct intel_soc_pmic *pmic = dev_get_drvdata(dev);

 	enable_irq(pmic->irq);
 	return 0;
 }
 #endif
 static SIMPLE_DEV_PM_OPS(bxtwc_pm_ops, bxtwc_suspend, bxtwc_resume);

 static const struct acpi_device_id bxtwc_acpi_ids[] = {
 	{ "INT34D3", },
 	{ }
 };
 MODULE_DEVICE_TABLE(acpi, bxtwc_acpi_ids);

 static struct platform_driver bxtwc_driver = {
 	.probe = bxtwc_probe,
 	.remove	= bxtwc_remove,
 	.shutdown = bxtwc_shutdown,
 	.driver	= {
 		.name	= "BXTWC PMIC",
 		.pm     = &bxtwc_pm_ops,
 		.acpi_match_table = ACPI_PTR(bxtwc_acpi_ids),
 	},
 };

 module_platform_driver(bxtwc_driver);

 MODULE_LICENSE("GPL v2");
 MODULE_AUTHOR("Qipeng Zha<qipeng.zha@intel.com>");
	// SPDX-License-Identifier: GPL-2.0
	/*
	* MFD core driver for Intel Broxton Whiskey Cove PMIC
	*
	* Copyright (C) 2015 Intel Corporation. All rights reserved.
	*/

	#include <linux/acpi.h>
	#include <linux/delay.h>
	#include <linux/err.h>
	#include <linux/interrupt.h>
	#include <linux/kernel.h>
	#include <linux/mfd/core.h>
	#include <linux/mfd/intel_soc_pmic.h>
	#include <linux/mfd/intel_soc_pmic_bxtwc.h>
	#include <linux/module.h>

	#include <asm/intel_scu_ipc.h>

	/* PMIC device registers */
	#define REG_ADDR_MASK 0xFF00
	#define REG_ADDR_SHIFT 8
	#define REG_OFFSET_MASK 0xFF

	/* Interrupt Status Registers */
	#define BXTWC_IRQLVL1 0x4E02

	#define BXTWC_PWRBTNIRQ 0x4E03
	#define BXTWC_THRM0IRQ 0x4E04
	#define BXTWC_THRM1IRQ 0x4E05
	#define BXTWC_THRM2IRQ 0x4E06
	#define BXTWC_BCUIRQ 0x4E07
	#define BXTWC_ADCIRQ 0x4E08
	#define BXTWC_CHGR0IRQ 0x4E09
	#define BXTWC_CHGR1IRQ 0x4E0A
	#define BXTWC_GPIOIRQ0 0x4E0B
	#define BXTWC_GPIOIRQ1 0x4E0C
	#define BXTWC_CRITIRQ 0x4E0D
	#define BXTWC_TMUIRQ 0x4FB6

	/* Interrupt MASK Registers */
	#define BXTWC_MIRQLVL1 0x4E0E
	#define BXTWC_MIRQLVL1_MCHGR BIT(5)

	#define BXTWC_MPWRBTNIRQ 0x4E0F
	#define BXTWC_MTHRM0IRQ 0x4E12
	#define BXTWC_MTHRM1IRQ 0x4E13
	#define BXTWC_MTHRM2IRQ 0x4E14
	#define BXTWC_MBCUIRQ 0x4E15
	#define BXTWC_MADCIRQ 0x4E16
	#define BXTWC_MCHGR0IRQ 0x4E17
	#define BXTWC_MCHGR1IRQ 0x4E18
	#define BXTWC_MGPIO0IRQ 0x4E19
	#define BXTWC_MGPIO1IRQ 0x4E1A
	#define BXTWC_MCRITIRQ 0x4E1B
	#define BXTWC_MTMUIRQ 0x4FB7

	/* Whiskey Cove PMIC share same ACPI ID between different platforms */
	#define BROXTON_PMIC_WC_HRV 4

	#define PMC_PMIC_ACCESS 0xFF
	#define PMC_PMIC_READ 0x0
	#define PMC_PMIC_WRITE 0x1

	enum bxtwc_irqs {
	BXTWC_PWRBTN_LVL1_IRQ = 0,
	BXTWC_TMU_LVL1_IRQ,
	BXTWC_THRM_LVL1_IRQ,
	BXTWC_BCU_LVL1_IRQ,
	BXTWC_ADC_LVL1_IRQ,
	BXTWC_CHGR_LVL1_IRQ,
	BXTWC_GPIO_LVL1_IRQ,
	BXTWC_CRIT_LVL1_IRQ,
	};

	enum bxtwc_irqs_pwrbtn {
	BXTWC_PWRBTN_IRQ = 0,
	BXTWC_UIBTN_IRQ,
	};

	enum bxtwc_irqs_bcu {
	BXTWC_BCU_IRQ = 0,
	};

	enum bxtwc_irqs_adc {
	BXTWC_ADC_IRQ = 0,
	};

	enum bxtwc_irqs_chgr {
	BXTWC_USBC_IRQ = 0,
	BXTWC_CHGR0_IRQ,
	BXTWC_CHGR1_IRQ,
	};

	enum bxtwc_irqs_tmu {
	BXTWC_TMU_IRQ = 0,
	};

	enum bxtwc_irqs_crit {
	BXTWC_CRIT_IRQ = 0,
	};

	static const struct regmap_irq bxtwc_regmap_irqs[] = {
	REGMAP_IRQ_REG(BXTWC_PWRBTN_LVL1_IRQ, 0, BIT(0)),
	REGMAP_IRQ_REG(BXTWC_TMU_LVL1_IRQ, 0, BIT(1)),
	REGMAP_IRQ_REG(BXTWC_THRM_LVL1_IRQ, 0, BIT(2)),
	REGMAP_IRQ_REG(BXTWC_BCU_LVL1_IRQ, 0, BIT(3)),
	REGMAP_IRQ_REG(BXTWC_ADC_LVL1_IRQ, 0, BIT(4)),
	REGMAP_IRQ_REG(BXTWC_CHGR_LVL1_IRQ, 0, BIT(5)),
	REGMAP_IRQ_REG(BXTWC_GPIO_LVL1_IRQ, 0, BIT(6)),
	REGMAP_IRQ_REG(BXTWC_CRIT_LVL1_IRQ, 0, BIT(7)),
	};

	static const struct regmap_irq bxtwc_regmap_irqs_pwrbtn[] = {
	REGMAP_IRQ_REG(BXTWC_PWRBTN_IRQ, 0, 0x01),
	};

	static const struct regmap_irq bxtwc_regmap_irqs_bcu[] = {
	REGMAP_IRQ_REG(BXTWC_BCU_IRQ, 0, 0x1f),
	};

	static const struct regmap_irq bxtwc_regmap_irqs_adc[] = {
	REGMAP_IRQ_REG(BXTWC_ADC_IRQ, 0, 0xff),
	};

	static const struct regmap_irq bxtwc_regmap_irqs_chgr[] = {
	REGMAP_IRQ_REG(BXTWC_USBC_IRQ, 0, 0x20),
	REGMAP_IRQ_REG(BXTWC_CHGR0_IRQ, 0, 0x1f),
	REGMAP_IRQ_REG(BXTWC_CHGR1_IRQ, 1, 0x1f),
	};

	static const struct regmap_irq bxtwc_regmap_irqs_tmu[] = {
	REGMAP_IRQ_REG(BXTWC_TMU_IRQ, 0, 0x06),
	};

	static const struct regmap_irq bxtwc_regmap_irqs_crit[] = {
	REGMAP_IRQ_REG(BXTWC_CRIT_IRQ, 0, 0x03),
	};

	static struct regmap_irq_chip bxtwc_regmap_irq_chip = {
	.name = "bxtwc_irq_chip",
	.status_base = BXTWC_IRQLVL1,
	.mask_base = BXTWC_MIRQLVL1,
	.irqs = bxtwc_regmap_irqs,
	.num_irqs = ARRAY_SIZE(bxtwc_regmap_irqs),
	.num_regs = 1,
	};

	static struct regmap_irq_chip bxtwc_regmap_irq_chip_pwrbtn = {
	.name = "bxtwc_irq_chip_pwrbtn",
	.status_base = BXTWC_PWRBTNIRQ,
	.mask_base = BXTWC_MPWRBTNIRQ,
	.irqs = bxtwc_regmap_irqs_pwrbtn,
	.num_irqs = ARRAY_SIZE(bxtwc_regmap_irqs_pwrbtn),
	.num_regs = 1,
	};

	static struct regmap_irq_chip bxtwc_regmap_irq_chip_tmu = {
	.name = "bxtwc_irq_chip_tmu",
	.status_base = BXTWC_TMUIRQ,
	.mask_base = BXTWC_MTMUIRQ,
	.irqs = bxtwc_regmap_irqs_tmu,
	.num_irqs = ARRAY_SIZE(bxtwc_regmap_irqs_tmu),
	.num_regs = 1,
	};

	static struct regmap_irq_chip bxtwc_regmap_irq_chip_bcu = {
	.name = "bxtwc_irq_chip_bcu",
	.status_base = BXTWC_BCUIRQ,
	.mask_base = BXTWC_MBCUIRQ,
	.irqs = bxtwc_regmap_irqs_bcu,
	.num_irqs = ARRAY_SIZE(bxtwc_regmap_irqs_bcu),
	.num_regs = 1,
	};

	static struct regmap_irq_chip bxtwc_regmap_irq_chip_adc = {
	.name = "bxtwc_irq_chip_adc",
	.status_base = BXTWC_ADCIRQ,
	.mask_base = BXTWC_MADCIRQ,
	.irqs = bxtwc_regmap_irqs_adc,
	.num_irqs = ARRAY_SIZE(bxtwc_regmap_irqs_adc),
	.num_regs = 1,
	};

	static struct regmap_irq_chip bxtwc_regmap_irq_chip_chgr = {
	.name = "bxtwc_irq_chip_chgr",
	.status_base = BXTWC_CHGR0IRQ,
	.mask_base = BXTWC_MCHGR0IRQ,
	.irqs = bxtwc_regmap_irqs_chgr,
	.num_irqs = ARRAY_SIZE(bxtwc_regmap_irqs_chgr),
	.num_regs = 2,
	};

	static struct regmap_irq_chip bxtwc_regmap_irq_chip_crit = {
	.name = "bxtwc_irq_chip_crit",
	.status_base = BXTWC_CRITIRQ,
	.mask_base = BXTWC_MCRITIRQ,
	.irqs = bxtwc_regmap_irqs_crit,
	.num_irqs = ARRAY_SIZE(bxtwc_regmap_irqs_crit),
	.num_regs = 1,
	};

	static const struct resource gpio_resources[] = {
	DEFINE_RES_IRQ_NAMED(BXTWC_GPIO_LVL1_IRQ, "GPIO"),
	};

	static const struct resource adc_resources[] = {
	DEFINE_RES_IRQ_NAMED(BXTWC_ADC_IRQ, "ADC"),
	};

	static const struct resource usbc_resources[] = {
	DEFINE_RES_IRQ(BXTWC_USBC_IRQ),
	};

	static const struct resource charger_resources[] = {
	DEFINE_RES_IRQ_NAMED(BXTWC_CHGR0_IRQ, "CHARGER"),
	DEFINE_RES_IRQ_NAMED(BXTWC_CHGR1_IRQ, "CHARGER1"),
	};

	static const struct resource thermal_resources[] = {
	DEFINE_RES_IRQ(BXTWC_THRM_LVL1_IRQ),
	};

	static const struct resource bcu_resources[] = {
	DEFINE_RES_IRQ_NAMED(BXTWC_BCU_IRQ, "BCU"),
	};

	static const struct resource tmu_resources[] = {
	DEFINE_RES_IRQ_NAMED(BXTWC_TMU_IRQ, "TMU"),
	};

	static struct mfd_cell bxt_wc_dev[] = {
	{
	.name = "bxt_wcove_gpadc",
	.num_resources = ARRAY_SIZE(adc_resources),
	.resources = adc_resources,
	},
	{
	.name = "bxt_wcove_thermal",
	.num_resources = ARRAY_SIZE(thermal_resources),
	.resources = thermal_resources,
	},
	{
	.name = "bxt_wcove_usbc",
	.num_resources = ARRAY_SIZE(usbc_resources),
	.resources = usbc_resources,
	},
	{
	.name = "bxt_wcove_ext_charger",
	.num_resources = ARRAY_SIZE(charger_resources),
	.resources = charger_resources,
	},
	{
	.name = "bxt_wcove_bcu",
	.num_resources = ARRAY_SIZE(bcu_resources),
	.resources = bcu_resources,
	},
	{
	.name = "bxt_wcove_tmu",
	.num_resources = ARRAY_SIZE(tmu_resources),
	.resources = tmu_resources,
	},

	{
	.name = "bxt_wcove_gpio",
	.num_resources = ARRAY_SIZE(gpio_resources),
	.resources = gpio_resources,
	},
	{
	.name = "bxt_wcove_region",
	},
	};

	static int regmap_ipc_byte_reg_read(void *context, unsigned int reg,
	unsigned int *val)
	{
	int ret;
	int i2c_addr;
	u8 ipc_in[2];
	u8 ipc_out[4];
	struct intel_soc_pmic *pmic = context;

	if (!pmic)
	return -EINVAL;

	if (reg & REG_ADDR_MASK)
	i2c_addr = (reg & REG_ADDR_MASK) >> REG_ADDR_SHIFT;
	else
	i2c_addr = BXTWC_DEVICE1_ADDR;

	reg &= REG_OFFSET_MASK;

	ipc_in[0] = reg;
	ipc_in[1] = i2c_addr;
	ret = intel_scu_ipc_dev_command(pmic->scu, PMC_PMIC_ACCESS,
	PMC_PMIC_READ, ipc_in, sizeof(ipc_in),
	ipc_out, sizeof(ipc_out));
	if (ret)
	return ret;

	*val = ipc_out[0];

	return 0;
	}

	static int regmap_ipc_byte_reg_write(void *context, unsigned int reg,
	unsigned int val)
	{
	int i2c_addr;
	u8 ipc_in[3];
	struct intel_soc_pmic *pmic = context;

	if (!pmic)
	return -EINVAL;

	if (reg & REG_ADDR_MASK)
	i2c_addr = (reg & REG_ADDR_MASK) >> REG_ADDR_SHIFT;
	else
	i2c_addr = BXTWC_DEVICE1_ADDR;

	reg &= REG_OFFSET_MASK;

	ipc_in[0] = reg;
	ipc_in[1] = i2c_addr;
	ipc_in[2] = val;
	return intel_scu_ipc_dev_command(pmic->scu, PMC_PMIC_ACCESS,
	PMC_PMIC_WRITE, ipc_in, sizeof(ipc_in),
	NULL, 0);
	}

	/* sysfs interfaces to r/w PMIC registers, required by initial script */
	static unsigned long bxtwc_reg_addr;
	static ssize_t addr_show(struct device *dev,
	struct device_attribute attr, char buf)
	{
	return sprintf(buf, "0x%lx\n", bxtwc_reg_addr);
	}

	static ssize_t addr_store(struct device *dev,
	struct device_attribute attr, const char buf, size_t count)
	{
	if (kstrtoul(buf, 0, &bxtwc_reg_addr)) {
	dev_err(dev, "Invalid register address\n");
	return -EINVAL;
	}
	return (ssize_t)count;
	}

	static ssize_t val_show(struct device *dev,
	struct device_attribute attr, char buf)
	{
	int ret;
	unsigned int val;
	struct intel_soc_pmic *pmic = dev_get_drvdata(dev);

	ret = regmap_read(pmic->regmap, bxtwc_reg_addr, &val);
	if (ret < 0) {
	dev_err(dev, "Failed to read 0x%lx\n", bxtwc_reg_addr);
	return -EIO;
	}

	return sprintf(buf, "0x%02x\n", val);
	}

	static ssize_t val_store(struct device *dev,
	struct device_attribute attr, const char buf, size_t count)
	{
	int ret;
	unsigned int val;
	struct intel_soc_pmic *pmic = dev_get_drvdata(dev);

	ret = kstrtouint(buf, 0, &val);
	if (ret)
	return ret;

	ret = regmap_write(pmic->regmap, bxtwc_reg_addr, val);
	if (ret) {
	dev_err(dev, "Failed to write value 0x%02x to address 0x%lx",
	val, bxtwc_reg_addr);
	return -EIO;
	}
	return count;
	}

	static DEVICE_ATTR_ADMIN_RW(addr);
	static DEVICE_ATTR_ADMIN_RW(val);
	static struct attribute *bxtwc_attrs[] = {
	&dev_attr_addr.attr,
	&dev_attr_val.attr,
	NULL
	};

	static const struct attribute_group bxtwc_group = {
	.attrs = bxtwc_attrs,
	};

	static const struct regmap_config bxtwc_regmap_config = {
	.reg_bits = 16,
	.val_bits = 8,
	.reg_write = regmap_ipc_byte_reg_write,
	.reg_read = regmap_ipc_byte_reg_read,
	};

	static int bxtwc_add_chained_irq_chip(struct intel_soc_pmic *pmic,
	struct regmap_irq_chip_data *pdata,
	int pirq, int irq_flags,
	const struct regmap_irq_chip *chip,
	struct regmap_irq_chip_data **data)
	{
	int irq;

	irq = regmap_irq_get_virq(pdata, pirq);
	if (irq < 0) {
	dev_err(pmic->dev,
	"Failed to get parent vIRQ(%d) for chip %s, ret:%d\n",
	pirq, chip->name, irq);
	return irq;
	}

	return devm_regmap_add_irq_chip(pmic->dev, pmic->regmap, irq, irq_flags,
	0, chip, data);
	}

	static int bxtwc_probe(struct platform_device *pdev)
	{
	int ret;
	acpi_handle handle;
	acpi_status status;
	unsigned long long hrv;
	struct intel_soc_pmic *pmic;

	handle = ACPI_HANDLE(&pdev->dev);
	status = acpi_evaluate_integer(handle, "_HRV", NULL, &hrv);
	if (ACPI_FAILURE(status)) {
	dev_err(&pdev->dev, "Failed to get PMIC hardware revision\n");
	return -ENODEV;
	}
	if (hrv != BROXTON_PMIC_WC_HRV) {
	dev_err(&pdev->dev, "Invalid PMIC hardware revision: %llu\n",
	hrv);
	return -ENODEV;
	}

	pmic = devm_kzalloc(&pdev->dev, sizeof(*pmic), GFP_KERNEL);
	if (!pmic)
	return -ENOMEM;

	ret = platform_get_irq(pdev, 0);
	if (ret < 0)
	return ret;
	pmic->irq = ret;

	dev_set_drvdata(&pdev->dev, pmic);
	pmic->dev = &pdev->dev;

	pmic->scu = devm_intel_scu_ipc_dev_get(&pdev->dev);
	if (!pmic->scu)
	return -EPROBE_DEFER;

	pmic->regmap = devm_regmap_init(&pdev->dev, NULL, pmic,
	&bxtwc_regmap_config);
	if (IS_ERR(pmic->regmap)) {
	ret = PTR_ERR(pmic->regmap);
	dev_err(&pdev->dev, "Failed to initialise regmap: %d\n", ret);
	return ret;
	}

	ret = devm_regmap_add_irq_chip(&pdev->dev, pmic->regmap, pmic->irq,
	IRQF_ONESHOT \| IRQF_SHARED,
	0, &bxtwc_regmap_irq_chip,
	&pmic->irq_chip_data);
	if (ret) {
	dev_err(&pdev->dev, "Failed to add IRQ chip\n");
	return ret;
	}

	ret = bxtwc_add_chained_irq_chip(pmic, pmic->irq_chip_data,
	BXTWC_PWRBTN_LVL1_IRQ,
	IRQF_ONESHOT,
	&bxtwc_regmap_irq_chip_pwrbtn,
	&pmic->irq_chip_data_pwrbtn);
	if (ret) {
	dev_err(&pdev->dev, "Failed to add PWRBTN IRQ chip\n");
	return ret;
	}

	ret = bxtwc_add_chained_irq_chip(pmic, pmic->irq_chip_data,
	BXTWC_TMU_LVL1_IRQ,
	IRQF_ONESHOT,
	&bxtwc_regmap_irq_chip_tmu,
	&pmic->irq_chip_data_tmu);
	if (ret) {
	dev_err(&pdev->dev, "Failed to add TMU IRQ chip\n");
	return ret;
	}

	/* Add chained IRQ handler for BCU IRQs */
	ret = bxtwc_add_chained_irq_chip(pmic, pmic->irq_chip_data,
	BXTWC_BCU_LVL1_IRQ,
	IRQF_ONESHOT,
	&bxtwc_regmap_irq_chip_bcu,
	&pmic->irq_chip_data_bcu);


	if (ret) {
	dev_err(&pdev->dev, "Failed to add BUC IRQ chip\n");
	return ret;
	}

	/* Add chained IRQ handler for ADC IRQs */
	ret = bxtwc_add_chained_irq_chip(pmic, pmic->irq_chip_data,
	BXTWC_ADC_LVL1_IRQ,
	IRQF_ONESHOT,
	&bxtwc_regmap_irq_chip_adc,
	&pmic->irq_chip_data_adc);


	if (ret) {
	dev_err(&pdev->dev, "Failed to add ADC IRQ chip\n");
	return ret;
	}

	/* Add chained IRQ handler for CHGR IRQs */
	ret = bxtwc_add_chained_irq_chip(pmic, pmic->irq_chip_data,
	BXTWC_CHGR_LVL1_IRQ,
	IRQF_ONESHOT,
	&bxtwc_regmap_irq_chip_chgr,
	&pmic->irq_chip_data_chgr);


	if (ret) {
	dev_err(&pdev->dev, "Failed to add CHGR IRQ chip\n");
	return ret;
	}

	/* Add chained IRQ handler for CRIT IRQs */
	ret = bxtwc_add_chained_irq_chip(pmic, pmic->irq_chip_data,
	BXTWC_CRIT_LVL1_IRQ,
	IRQF_ONESHOT,
	&bxtwc_regmap_irq_chip_crit,
	&pmic->irq_chip_data_crit);


	if (ret) {
	dev_err(&pdev->dev, "Failed to add CRIT IRQ chip\n");
	return ret;
	}

	ret = devm_mfd_add_devices(&pdev->dev, PLATFORM_DEVID_NONE, bxt_wc_dev,
	ARRAY_SIZE(bxt_wc_dev), NULL, 0, NULL);
	if (ret) {
	dev_err(&pdev->dev, "Failed to add devices\n");
	return ret;
	}

	ret = sysfs_create_group(&pdev->dev.kobj, &bxtwc_group);
	if (ret) {
	dev_err(&pdev->dev, "Failed to create sysfs group %d\n", ret);
	return ret;
	}

	/*
	* There is known hw bug. Upon reset BIT 5 of register
	* BXTWC_CHGR_LVL1_IRQ is 0 which is the expected value. However,
	* later it's set to 1(masked) automatically by hardware. So we
	* have the software workaround here to unmaksed it in order to let
	* charger interrutp work.
	*/
	regmap_update_bits(pmic->regmap, BXTWC_MIRQLVL1,
	BXTWC_MIRQLVL1_MCHGR, 0);

	return 0;
	}

	static int bxtwc_remove(struct platform_device *pdev)
	{
	sysfs_remove_group(&pdev->dev.kobj, &bxtwc_group);

	return 0;
	}

	static void bxtwc_shutdown(struct platform_device *pdev)
	{
	struct intel_soc_pmic *pmic = dev_get_drvdata(&pdev->dev);

	disable_irq(pmic->irq);
	}

	#ifdef CONFIG_PM_SLEEP
	static int bxtwc_suspend(struct device *dev)
	{
	struct intel_soc_pmic *pmic = dev_get_drvdata(dev);

	disable_irq(pmic->irq);

	return 0;
	}

	static int bxtwc_resume(struct device *dev)
	{
	struct intel_soc_pmic *pmic = dev_get_drvdata(dev);

	enable_irq(pmic->irq);
	return 0;
	}
	#endif
	static SIMPLE_DEV_PM_OPS(bxtwc_pm_ops, bxtwc_suspend, bxtwc_resume);

	static const struct acpi_device_id bxtwc_acpi_ids[] = {
	{ "INT34D3", },
	{ }
	};
	MODULE_DEVICE_TABLE(acpi, bxtwc_acpi_ids);

	static struct platform_driver bxtwc_driver = {
	.probe = bxtwc_probe,
	.remove = bxtwc_remove,
	.shutdown = bxtwc_shutdown,
	.driver = {
	.name = "BXTWC PMIC",
	.pm = &bxtwc_pm_ops,
	.acpi_match_table = ACPI_PTR(bxtwc_acpi_ids),
	},
	};

	module_platform_driver(bxtwc_driver);

	MODULE_LICENSE("GPL v2");
	MODULE_AUTHOR("Qipeng Zha<qipeng.zha@intel.com>");