mfd: mt6397: Extract IRQ related code from core driver

In order to support different types of irq design, we decide to add
separate irq drivers for different design and keep mt6397 mfd core
simple and reusable to all generations of PMICs so far.

Signed-off-by: Hsin-Hsiung Wang <hsin-hsiung.wang@mediatek.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

3 files changed, 183 insertions, 147 deletions

diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 446d5df7cacb..7b6a6aa4fe42 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -240,7 +240,8 @@ obj-$(CONFIG_INTEL_SOC_PMIC)	+= intel-soc-pmic.o
 obj-$(CONFIG_INTEL_SOC_PMIC_BXTWC)	+= intel_soc_pmic_bxtwc.o
 obj-$(CONFIG_INTEL_SOC_PMIC_CHTWC)	+= intel_soc_pmic_chtwc.o
 obj-$(CONFIG_INTEL_SOC_PMIC_CHTDC_TI)	+= intel_soc_pmic_chtdc_ti.o
-obj-$(CONFIG_MFD_MT6397)	+= mt6397-core.o
+mt6397-objs	:= mt6397-core.o mt6397-irq.o
+obj-$(CONFIG_MFD_MT6397)	+= mt6397.o
 
 obj-$(CONFIG_MFD_ALTERA_A10SR)	+= altera-a10sr.o
 obj-$(CONFIG_MFD_ALTERA_SYSMGR) += altera-sysmgr.o
diff --git a/drivers/mfd/mt6397-core.c b/drivers/mfd/mt6397-core.c
index c0708622f41b..93c888153b77 100644
--- a/drivers/mfd/mt6397-core.c
+++ b/drivers/mfd/mt6397-core.c
@@ -18,10 +18,6 @@
 #define MT6397_RTC_BASE		0xe000
 #define MT6397_RTC_SIZE		0x3e
 
-#define MT6323_CHIP_ID		0x23
-#define MT6391_CHIP_ID		0x91
-#define MT6397_CHIP_ID		0x97
-
 static const struct resource mt6397_rtc_resources[] = {
 	{
 		.start = MT6397_RTC_BASE,
@@ -86,148 +82,6 @@ static const struct mfd_cell mt6397_devs[] = {
 	}
 };
 
-static void mt6397_irq_lock(struct irq_data *data)
-{
-	struct mt6397_chip *mt6397 = irq_data_get_irq_chip_data(data);
-
-	mutex_lock(&mt6397->irqlock);
-}
-
-static void mt6397_irq_sync_unlock(struct irq_data *data)
-{
-	struct mt6397_chip *mt6397 = irq_data_get_irq_chip_data(data);
-
-	regmap_write(mt6397->regmap, mt6397->int_con[0],
-		     mt6397->irq_masks_cur[0]);
-	regmap_write(mt6397->regmap, mt6397->int_con[1],
-		     mt6397->irq_masks_cur[1]);
-
-	mutex_unlock(&mt6397->irqlock);
-}
-
-static void mt6397_irq_disable(struct irq_data *data)
-{
-	struct mt6397_chip *mt6397 = irq_data_get_irq_chip_data(data);
-	int shift = data->hwirq & 0xf;
-	int reg = data->hwirq >> 4;
-
-	mt6397->irq_masks_cur[reg] &= ~BIT(shift);
-}
-
-static void mt6397_irq_enable(struct irq_data *data)
-{
-	struct mt6397_chip *mt6397 = irq_data_get_irq_chip_data(data);
-	int shift = data->hwirq & 0xf;
-	int reg = data->hwirq >> 4;
-
-	mt6397->irq_masks_cur[reg] |= BIT(shift);
-}
-
-#ifdef CONFIG_PM_SLEEP
-static int mt6397_irq_set_wake(struct irq_data *irq_data, unsigned int on)
-{
-	struct mt6397_chip *mt6397 = irq_data_get_irq_chip_data(irq_data);
-	int shift = irq_data->hwirq & 0xf;
-	int reg = irq_data->hwirq >> 4;
-
-	if (on)
-		mt6397->wake_mask[reg] |= BIT(shift);
-	else
-		mt6397->wake_mask[reg] &= ~BIT(shift);
-
-	return 0;
-}
-#else
-#define mt6397_irq_set_wake NULL
-#endif
-
-static struct irq_chip mt6397_irq_chip = {
-	.name = "mt6397-irq",
-	.irq_bus_lock = mt6397_irq_lock,
-	.irq_bus_sync_unlock = mt6397_irq_sync_unlock,
-	.irq_enable = mt6397_irq_enable,
-	.irq_disable = mt6397_irq_disable,
-	.irq_set_wake = mt6397_irq_set_wake,
-};
-
-static void mt6397_irq_handle_reg(struct mt6397_chip *mt6397, int reg,
-		int irqbase)
-{
-	unsigned int status;
-	int i, irq, ret;
-
-	ret = regmap_read(mt6397->regmap, reg, &status);
-	if (ret) {
-		dev_err(mt6397->dev, "Failed to read irq status: %d\n", ret);
-		return;
-	}
-
-	for (i = 0; i < 16; i++) {
-		if (status & BIT(i)) {
-			irq = irq_find_mapping(mt6397->irq_domain, irqbase + i);
-			if (irq)
-				handle_nested_irq(irq);
-		}
-	}
-
-	regmap_write(mt6397->regmap, reg, status);
-}
-
-static irqreturn_t mt6397_irq_thread(int irq, void *data)
-{
-	struct mt6397_chip *mt6397 = data;
-
-	mt6397_irq_handle_reg(mt6397, mt6397->int_status[0], 0);
-	mt6397_irq_handle_reg(mt6397, mt6397->int_status[1], 16);
-
-	return IRQ_HANDLED;
-}
-
-static int mt6397_irq_domain_map(struct irq_domain *d, unsigned int irq,
-					irq_hw_number_t hw)
-{
-	struct mt6397_chip *mt6397 = d->host_data;
-
-	irq_set_chip_data(irq, mt6397);
-	irq_set_chip_and_handler(irq, &mt6397_irq_chip, handle_level_irq);
-	irq_set_nested_thread(irq, 1);
-	irq_set_noprobe(irq);
-
-	return 0;
-}
-
-static const struct irq_domain_ops mt6397_irq_domain_ops = {
-	.map = mt6397_irq_domain_map,
-};
-
-static int mt6397_irq_init(struct mt6397_chip *mt6397)
-{
-	int ret;
-
-	mutex_init(&mt6397->irqlock);
-
-	/* Mask all interrupt sources */
-	regmap_write(mt6397->regmap, mt6397->int_con[0], 0x0);
-	regmap_write(mt6397->regmap, mt6397->int_con[1], 0x0);
-
-	mt6397->irq_domain = irq_domain_add_linear(mt6397->dev->of_node,
-		MT6397_IRQ_NR, &mt6397_irq_domain_ops, mt6397);
-	if (!mt6397->irq_domain) {
-		dev_err(mt6397->dev, "could not create irq domain\n");
-		return -ENOMEM;
-	}
-
-	ret = devm_request_threaded_irq(mt6397->dev, mt6397->irq, NULL,
-		mt6397_irq_thread, IRQF_ONESHOT, "mt6397-pmic", mt6397);
-	if (ret) {
-		dev_err(mt6397->dev, "failed to register irq=%d; err: %d\n",
-			mt6397->irq, ret);
-		return ret;
-	}
-
-	return 0;
-}
-
 #ifdef CONFIG_PM_SLEEP
 static int mt6397_irq_suspend(struct device *dev)
 {
diff --git a/drivers/mfd/mt6397-irq.c b/drivers/mfd/mt6397-irq.c
new file mode 100644
index 000000000000..b2d3ce1f3115
--- /dev/null
+++ b/drivers/mfd/mt6397-irq.c
@@ -0,0 +1,181 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// Copyright (c) 2019 MediaTek Inc.
+
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_irq.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/mfd/mt6323/core.h>
+#include <linux/mfd/mt6323/registers.h>
+#include <linux/mfd/mt6397/core.h>
+#include <linux/mfd/mt6397/registers.h>
+
+static void mt6397_irq_lock(struct irq_data *data)
+{
+	struct mt6397_chip *mt6397 = irq_data_get_irq_chip_data(data);
+
+	mutex_lock(&mt6397->irqlock);
+}
+
+static void mt6397_irq_sync_unlock(struct irq_data *data)
+{
+	struct mt6397_chip *mt6397 = irq_data_get_irq_chip_data(data);
+
+	regmap_write(mt6397->regmap, mt6397->int_con[0],
+		     mt6397->irq_masks_cur[0]);
+	regmap_write(mt6397->regmap, mt6397->int_con[1],
+		     mt6397->irq_masks_cur[1]);
+
+	mutex_unlock(&mt6397->irqlock);
+}
+
+static void mt6397_irq_disable(struct irq_data *data)
+{
+	struct mt6397_chip *mt6397 = irq_data_get_irq_chip_data(data);
+	int shift = data->hwirq & 0xf;
+	int reg = data->hwirq >> 4;
+
+	mt6397->irq_masks_cur[reg] &= ~BIT(shift);
+}
+
+static void mt6397_irq_enable(struct irq_data *data)
+{
+	struct mt6397_chip *mt6397 = irq_data_get_irq_chip_data(data);
+	int shift = data->hwirq & 0xf;
+	int reg = data->hwirq >> 4;
+
+	mt6397->irq_masks_cur[reg] |= BIT(shift);
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int mt6397_irq_set_wake(struct irq_data *irq_data, unsigned int on)
+{
+	struct mt6397_chip *mt6397 = irq_data_get_irq_chip_data(irq_data);
+	int shift = irq_data->hwirq & 0xf;
+	int reg = irq_data->hwirq >> 4;
+
+	if (on)
+		mt6397->wake_mask[reg] |= BIT(shift);
+	else
+		mt6397->wake_mask[reg] &= ~BIT(shift);
+
+	return 0;
+}
+#else
+#define mt6397_irq_set_wake NULL
+#endif
+
+static struct irq_chip mt6397_irq_chip = {
+	.name = "mt6397-irq",
+	.irq_bus_lock = mt6397_irq_lock,
+	.irq_bus_sync_unlock = mt6397_irq_sync_unlock,
+	.irq_enable = mt6397_irq_enable,
+	.irq_disable = mt6397_irq_disable,
+	.irq_set_wake = mt6397_irq_set_wake,
+};
+
+static void mt6397_irq_handle_reg(struct mt6397_chip *mt6397, int reg,
+				  int irqbase)
+{
+	unsigned int status;
+	int i, irq, ret;
+
+	ret = regmap_read(mt6397->regmap, reg, &status);
+	if (ret) {
+		dev_err(mt6397->dev, "Failed to read irq status: %d\n", ret);
+		return;
+	}
+
+	for (i = 0; i < 16; i++) {
+		if (status & BIT(i)) {
+			irq = irq_find_mapping(mt6397->irq_domain, irqbase + i);
+			if (irq)
+				handle_nested_irq(irq);
+		}
+	}
+
+	regmap_write(mt6397->regmap, reg, status);
+}
+
+static irqreturn_t mt6397_irq_thread(int irq, void *data)
+{
+	struct mt6397_chip *mt6397 = data;
+
+	mt6397_irq_handle_reg(mt6397, mt6397->int_status[0], 0);
+	mt6397_irq_handle_reg(mt6397, mt6397->int_status[1], 16);
+
+	return IRQ_HANDLED;
+}
+
+static int mt6397_irq_domain_map(struct irq_domain *d, unsigned int irq,
+				 irq_hw_number_t hw)
+{
+	struct mt6397_chip *mt6397 = d->host_data;
+
+	irq_set_chip_data(irq, mt6397);
+	irq_set_chip_and_handler(irq, &mt6397_irq_chip, handle_level_irq);
+	irq_set_nested_thread(irq, 1);
+	irq_set_noprobe(irq);
+
+	return 0;
+}
+
+static const struct irq_domain_ops mt6397_irq_domain_ops = {
+	.map = mt6397_irq_domain_map,
+};
+
+int mt6397_irq_init(struct mt6397_chip *chip)
+{
+	int ret;
+
+	mutex_init(&chip->irqlock);
+
+	switch (chip->chip_id) {
+	case MT6323_CHIP_ID:
+		chip->int_con[0] = MT6323_INT_CON0;
+		chip->int_con[1] = MT6323_INT_CON1;
+		chip->int_status[0] = MT6323_INT_STATUS0;
+		chip->int_status[1] = MT6323_INT_STATUS1;
+		break;
+
+	case MT6391_CHIP_ID:
+	case MT6397_CHIP_ID:
+		chip->int_con[0] = MT6397_INT_CON0;
+		chip->int_con[1] = MT6397_INT_CON1;
+		chip->int_status[0] = MT6397_INT_STATUS0;
+		chip->int_status[1] = MT6397_INT_STATUS1;
+		break;
+
+	default:
+		dev_err(chip->dev, "unsupported chip: 0x%x\n", chip->chip_id);
+		return -ENODEV;
+	}
+
+	/* Mask all interrupt sources */
+	regmap_write(chip->regmap, chip->int_con[0], 0x0);
+	regmap_write(chip->regmap, chip->int_con[1], 0x0);
+
+	chip->irq_domain = irq_domain_add_linear(chip->dev->of_node,
+						 MT6397_IRQ_NR,
+						 &mt6397_irq_domain_ops,
+						 chip);
+	if (!chip->irq_domain) {
+		dev_err(chip->dev, "could not create irq domain\n");
+		return -ENOMEM;
+	}
+
+	ret = devm_request_threaded_irq(chip->dev, chip->irq, NULL,
+					mt6397_irq_thread, IRQF_ONESHOT,
+					"mt6397-pmic", chip);
+	if (ret) {
+		dev_err(chip->dev, "failed to register irq=%d; err: %d\n",
+			chip->irq, ret);
+		return ret;
+	}
+
+	return 0;
+}