mfd: Add s5m series irq driver

This patch support irq for s5m series.
Basically, S5M8767 and S5M8763 irq can be handled by this patch.
Signed-off-by: NSangbeom Kim <sbkim73@samsung.com>
Signed-off-by: NSamuel Ortiz <sameo@linux.intel.com>

drivers/mfd/s5m-irq.c

+/*
+ * s5m-irq.c
+ *
+ * Copyright (c) 2011 Samsung Electronics Co., Ltd
+ *              http://www.samsung.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.
+ *
+ */
+
+#include <linux/device.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/mfd/s5m87xx/s5m-core.h>
+
+struct s5m_irq_data {
+	int reg;
+	int mask;
+};
+
+static struct s5m_irq_data s5m8767_irqs[] = {
+	[S5M8767_IRQ_PWRR] = {
+		.reg = 1,
+		.mask = S5M8767_IRQ_PWRR_MASK,
+	},
+	[S5M8767_IRQ_PWRF] = {
+		.reg = 1,
+		.mask = S5M8767_IRQ_PWRF_MASK,
+	},
+	[S5M8767_IRQ_PWR1S] = {
+		.reg = 1,
+		.mask = S5M8767_IRQ_PWR1S_MASK,
+	},
+	[S5M8767_IRQ_JIGR] = {
+		.reg = 1,
+		.mask = S5M8767_IRQ_JIGR_MASK,
+	},
+	[S5M8767_IRQ_JIGF] = {
+		.reg = 1,
+		.mask = S5M8767_IRQ_JIGF_MASK,
+	},
+	[S5M8767_IRQ_LOWBAT2] = {
+		.reg = 1,
+		.mask = S5M8767_IRQ_LOWBAT2_MASK,
+	},
+	[S5M8767_IRQ_LOWBAT1] = {
+		.reg = 1,
+		.mask = S5M8767_IRQ_LOWBAT1_MASK,
+	},
+	[S5M8767_IRQ_MRB] = {
+		.reg = 2,
+		.mask = S5M8767_IRQ_MRB_MASK,
+	},
+	[S5M8767_IRQ_DVSOK2] = {
+		.reg = 2,
+		.mask = S5M8767_IRQ_DVSOK2_MASK,
+	},
+	[S5M8767_IRQ_DVSOK3] = {
+		.reg = 2,
+		.mask = S5M8767_IRQ_DVSOK3_MASK,
+	},
+	[S5M8767_IRQ_DVSOK4] = {
+		.reg = 2,
+		.mask = S5M8767_IRQ_DVSOK4_MASK,
+	},
+	[S5M8767_IRQ_RTC60S] = {
+		.reg = 3,
+		.mask = S5M8767_IRQ_RTC60S_MASK,
+	},
+	[S5M8767_IRQ_RTCA1] = {
+		.reg = 3,
+		.mask = S5M8767_IRQ_RTCA1_MASK,
+	},
+	[S5M8767_IRQ_RTCA2] = {
+		.reg = 3,
+		.mask = S5M8767_IRQ_RTCA2_MASK,
+	},
+	[S5M8767_IRQ_SMPL] = {
+		.reg = 3,
+		.mask = S5M8767_IRQ_SMPL_MASK,
+	},
+	[S5M8767_IRQ_RTC1S] = {
+		.reg = 3,
+		.mask = S5M8767_IRQ_RTC1S_MASK,
+	},
+	[S5M8767_IRQ_WTSR] = {
+		.reg = 3,
+		.mask = S5M8767_IRQ_WTSR_MASK,
+	},
+};
+
+static struct s5m_irq_data s5m8763_irqs[] = {
+	[S5M8763_IRQ_DCINF] = {
+		.reg = 1,
+		.mask = S5M8763_IRQ_DCINF_MASK,
+	},
+	[S5M8763_IRQ_DCINR] = {
+		.reg = 1,
+		.mask = S5M8763_IRQ_DCINR_MASK,
+	},
+	[S5M8763_IRQ_JIGF] = {
+		.reg = 1,
+		.mask = S5M8763_IRQ_JIGF_MASK,
+	},
+	[S5M8763_IRQ_JIGR] = {
+		.reg = 1,
+		.mask = S5M8763_IRQ_JIGR_MASK,
+	},
+	[S5M8763_IRQ_PWRONF] = {
+		.reg = 1,
+		.mask = S5M8763_IRQ_PWRONF_MASK,
+	},
+	[S5M8763_IRQ_PWRONR] = {
+		.reg = 1,
+		.mask = S5M8763_IRQ_PWRONR_MASK,
+	},
+	[S5M8763_IRQ_WTSREVNT] = {
+		.reg = 2,
+		.mask = S5M8763_IRQ_WTSREVNT_MASK,
+	},
+	[S5M8763_IRQ_SMPLEVNT] = {
+		.reg = 2,
+		.mask = S5M8763_IRQ_SMPLEVNT_MASK,
+	},
+	[S5M8763_IRQ_ALARM1] = {
+		.reg = 2,
+		.mask = S5M8763_IRQ_ALARM1_MASK,
+	},
+	[S5M8763_IRQ_ALARM0] = {
+		.reg = 2,
+		.mask = S5M8763_IRQ_ALARM0_MASK,
+	},
+	[S5M8763_IRQ_ONKEY1S] = {
+		.reg = 3,
+		.mask = S5M8763_IRQ_ONKEY1S_MASK,
+	},
+	[S5M8763_IRQ_TOPOFFR] = {
+		.reg = 3,
+		.mask = S5M8763_IRQ_TOPOFFR_MASK,
+	},
+	[S5M8763_IRQ_DCINOVPR] = {
+		.reg = 3,
+		.mask = S5M8763_IRQ_DCINOVPR_MASK,
+	},
+	[S5M8763_IRQ_CHGRSTF] = {
+		.reg = 3,
+		.mask = S5M8763_IRQ_CHGRSTF_MASK,
+	},
+	[S5M8763_IRQ_DONER] = {
+		.reg = 3,
+		.mask = S5M8763_IRQ_DONER_MASK,
+	},
+	[S5M8763_IRQ_CHGFAULT] = {
+		.reg = 3,
+		.mask = S5M8763_IRQ_CHGFAULT_MASK,
+	},
+	[S5M8763_IRQ_LOBAT1] = {
+		.reg = 4,
+		.mask = S5M8763_IRQ_LOBAT1_MASK,
+	},
+	[S5M8763_IRQ_LOBAT2] = {
+		.reg = 4,
+		.mask = S5M8763_IRQ_LOBAT2_MASK,
+	},
+};
+
+static inline struct s5m_irq_data *
+irq_to_s5m8767_irq(struct s5m87xx_dev *s5m87xx, int irq)
+{
+	return &s5m8767_irqs[irq - s5m87xx->irq_base];
+}
+
+static void s5m8767_irq_lock(struct irq_data *data)
+{
+	struct s5m87xx_dev *s5m87xx = irq_data_get_irq_chip_data(data);
+
+	mutex_lock(&s5m87xx->irqlock);
+}
+
+static void s5m8767_irq_sync_unlock(struct irq_data *data)
+{
+	struct s5m87xx_dev *s5m87xx = irq_data_get_irq_chip_data(data);
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(s5m87xx->irq_masks_cur); i++) {
+		if (s5m87xx->irq_masks_cur[i] != s5m87xx->irq_masks_cache[i]) {
+			s5m87xx->irq_masks_cache[i] = s5m87xx->irq_masks_cur[i];
+			s5m_reg_write(s5m87xx, S5M8767_REG_INT1M + i,
+					s5m87xx->irq_masks_cur[i]);
+		}
+	}
+
+	mutex_unlock(&s5m87xx->irqlock);
+}
+
+static void s5m8767_irq_unmask(struct irq_data *data)
+{
+	struct s5m87xx_dev *s5m87xx = irq_data_get_irq_chip_data(data);
+	struct s5m_irq_data *irq_data = irq_to_s5m8767_irq(s5m87xx,
+							       data->irq);
+
+	s5m87xx->irq_masks_cur[irq_data->reg - 1] &= ~irq_data->mask;
+}
+
+static void s5m8767_irq_mask(struct irq_data *data)
+{
+	struct s5m87xx_dev *s5m87xx = irq_data_get_irq_chip_data(data);
+	struct s5m_irq_data *irq_data = irq_to_s5m8767_irq(s5m87xx,
+							       data->irq);
+
+	s5m87xx->irq_masks_cur[irq_data->reg - 1] |= irq_data->mask;
+}
+
+static struct irq_chip s5m8767_irq_chip = {
+	.name = "s5m8767",
+	.irq_bus_lock = s5m8767_irq_lock,
+	.irq_bus_sync_unlock = s5m8767_irq_sync_unlock,
+	.irq_mask = s5m8767_irq_mask,
+	.irq_unmask = s5m8767_irq_unmask,
+};
+
+static inline struct s5m_irq_data *
+irq_to_s5m8763_irq(struct s5m87xx_dev *s5m87xx, int irq)
+{
+	return &s5m8763_irqs[irq - s5m87xx->irq_base];
+}
+
+static void s5m8763_irq_lock(struct irq_data *data)
+{
+	struct s5m87xx_dev *s5m87xx = irq_data_get_irq_chip_data(data);
+
+	mutex_lock(&s5m87xx->irqlock);
+}
+
+static void s5m8763_irq_sync_unlock(struct irq_data *data)
+{
+	struct s5m87xx_dev *s5m87xx = irq_data_get_irq_chip_data(data);
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(s5m87xx->irq_masks_cur); i++) {
+		if (s5m87xx->irq_masks_cur[i] != s5m87xx->irq_masks_cache[i]) {
+			s5m87xx->irq_masks_cache[i] = s5m87xx->irq_masks_cur[i];
+			s5m_reg_write(s5m87xx, S5M8763_REG_IRQM1 + i,
+					s5m87xx->irq_masks_cur[i]);
+		}
+	}
+
+	mutex_unlock(&s5m87xx->irqlock);
+}
+
+static void s5m8763_irq_unmask(struct irq_data *data)
+{
+	struct s5m87xx_dev *s5m87xx = irq_data_get_irq_chip_data(data);
+	struct s5m_irq_data *irq_data = irq_to_s5m8763_irq(s5m87xx,
+							       data->irq);
+
+	s5m87xx->irq_masks_cur[irq_data->reg - 1] &= ~irq_data->mask;
+}
+
+static void s5m8763_irq_mask(struct irq_data *data)
+{
+	struct s5m87xx_dev *s5m87xx = irq_data_get_irq_chip_data(data);
+	struct s5m_irq_data *irq_data = irq_to_s5m8763_irq(s5m87xx,
+							       data->irq);
+
+	s5m87xx->irq_masks_cur[irq_data->reg - 1] |= irq_data->mask;
+}
+
+static struct irq_chip s5m8763_irq_chip = {
+	.name = "s5m8763",
+	.irq_bus_lock = s5m8763_irq_lock,
+	.irq_bus_sync_unlock = s5m8763_irq_sync_unlock,
+	.irq_mask = s5m8763_irq_mask,
+	.irq_unmask = s5m8763_irq_unmask,
+};
+
+
+static irqreturn_t s5m8767_irq_thread(int irq, void *data)
+{
+	struct s5m87xx_dev *s5m87xx = data;
+	u8 irq_reg[NUM_IRQ_REGS-1];
+	int ret;
+	int i;
+
+
+	ret = s5m_bulk_read(s5m87xx, S5M8767_REG_INT1,
+				NUM_IRQ_REGS - 1, irq_reg);
+	if (ret < 0) {
+		dev_err(s5m87xx->dev, "Failed to read interrupt register: %d\n",
+				ret);
+		return IRQ_NONE;
+	}
+
+	for (i = 0; i < NUM_IRQ_REGS - 1; i++)
+		irq_reg[i] &= ~s5m87xx->irq_masks_cur[i];
+
+	for (i = 0; i < S5M8767_IRQ_NR; i++) {
+		if (irq_reg[s5m8767_irqs[i].reg - 1] & s5m8767_irqs[i].mask)
+			handle_nested_irq(s5m87xx->irq_base + i);
+	}
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t s5m8763_irq_thread(int irq, void *data)
+{
+	struct s5m87xx_dev *s5m87xx = data;
+	u8 irq_reg[NUM_IRQ_REGS];
+	int ret;
+	int i;
+
+	ret = s5m_bulk_read(s5m87xx, S5M8763_REG_IRQ1,
+				NUM_IRQ_REGS, irq_reg);
+	if (ret < 0) {
+		dev_err(s5m87xx->dev, "Failed to read interrupt register: %d\n",
+				ret);
+		return IRQ_NONE;
+	}
+
+	for (i = 0; i < NUM_IRQ_REGS; i++)
+		irq_reg[i] &= ~s5m87xx->irq_masks_cur[i];
+
+	for (i = 0; i < S5M8763_IRQ_NR; i++) {
+		if (irq_reg[s5m8763_irqs[i].reg - 1] & s5m8763_irqs[i].mask)
+			handle_nested_irq(s5m87xx->irq_base + i);
+	}
+
+	return IRQ_HANDLED;
+}
+
+int s5m_irq_resume(struct s5m87xx_dev *s5m87xx)
+{
+	if (s5m87xx->irq && s5m87xx->irq_base){
+		switch (s5m87xx->device_type) {
+		case S5M8763X:
+			s5m8763_irq_thread(s5m87xx->irq_base, s5m87xx);
+			break;
+		case S5M8767X:
+			s5m8767_irq_thread(s5m87xx->irq_base, s5m87xx);
+			break;
+		default:
+			break;
+
+		}
+	}
+	return 0;
+}
+
+int s5m_irq_init(struct s5m87xx_dev *s5m87xx)
+{
+	int i;
+	int cur_irq;
+	int ret = 0;
+	int type = s5m87xx->device_type;
+
+	if (!s5m87xx->irq) {
+		dev_warn(s5m87xx->dev,
+			 "No interrupt specified, no interrupts\n");
+		s5m87xx->irq_base = 0;
+		return 0;
+	}
+
+	if (!s5m87xx->irq_base) {
+		dev_err(s5m87xx->dev,
+			"No interrupt base specified, no interrupts\n");
+		return 0;
+	}
+
+	mutex_init(&s5m87xx->irqlock);
+
+	switch (type) {
+	case S5M8763X:
+		for (i = 0; i < NUM_IRQ_REGS; i++) {
+			s5m87xx->irq_masks_cur[i] = 0xff;
+			s5m87xx->irq_masks_cache[i] = 0xff;
+			s5m_reg_write(s5m87xx, S5M8763_REG_IRQM1 + i,
+						0xff);
+		}
+
+		s5m_reg_write(s5m87xx, S5M8763_REG_STATUSM1, 0xff);
+		s5m_reg_write(s5m87xx, S5M8763_REG_STATUSM2, 0xff);
+
+		for (i = 0; i < S5M8763_IRQ_NR; i++) {
+			cur_irq = i + s5m87xx->irq_base;
+			irq_set_chip_data(cur_irq, s5m87xx);
+			irq_set_chip_and_handler(cur_irq, &s5m8763_irq_chip,
+						 handle_edge_irq);
+			irq_set_nested_thread(cur_irq, 1);
+#ifdef CONFIG_ARM
+			set_irq_flags(cur_irq, IRQF_VALID);
+#else
+			irq_set_noprobe(cur_irq);
+#endif
+		}
+
+		ret = request_threaded_irq(s5m87xx->irq, NULL,
+					s5m8763_irq_thread,
+					IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
+					"s5m87xx-irq", s5m87xx);
+		if (ret) {
+			dev_err(s5m87xx->dev, "Failed to request IRQ %d: %d\n",
+				s5m87xx->irq, ret);
+			return ret;
+		}
+		break;
+	case S5M8767X:
+		for (i = 0; i < NUM_IRQ_REGS - 1; i++) {
+			s5m87xx->irq_masks_cur[i] = 0xff;
+			s5m87xx->irq_masks_cache[i] = 0xff;
+			s5m_reg_write(s5m87xx, S5M8767_REG_INT1M + i,
+						0xff);
+		}
+		for (i = 0; i < S5M8767_IRQ_NR; i++) {
+			cur_irq = i + s5m87xx->irq_base;
+			irq_set_chip_data(cur_irq, s5m87xx);
+			if (ret) {
+				dev_err(s5m87xx->dev,
+					"Failed to irq_set_chip_data %d: %d\n",
+					s5m87xx->irq, ret);
+				return ret;
+			}
+
+			irq_set_chip_and_handler(cur_irq, &s5m8767_irq_chip,
+						 handle_edge_irq);
+			irq_set_nested_thread(cur_irq, 1);
+#ifdef CONFIG_ARM
+			set_irq_flags(cur_irq, IRQF_VALID);
+#else
+			irq_set_noprobe(cur_irq);
+#endif
+		}
+
+		ret = request_threaded_irq(s5m87xx->irq, NULL,
+					   s5m8767_irq_thread,
+					   IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
+					   "s5m87xx-irq", s5m87xx);
+		if (ret) {
+			dev_err(s5m87xx->dev, "Failed to request IRQ %d: %d\n",
+				s5m87xx->irq, ret);
+			return ret;
+		}
+		break;
+	default:
+		break;
+	}
+
+	if (!s5m87xx->ono)
+		return 0;
+
+	switch (type) {
+	case S5M8763X:
+		ret = request_threaded_irq(s5m87xx->ono, NULL,
+						s5m8763_irq_thread,
+						IRQF_TRIGGER_FALLING |
+						IRQF_TRIGGER_RISING |
+						IRQF_ONESHOT, "s5m87xx-ono",
+						s5m87xx);
+		break;
+	case S5M8767X:
+		ret = request_threaded_irq(s5m87xx->ono, NULL,
+					s5m8767_irq_thread,
+					IRQF_TRIGGER_FALLING |
+					IRQF_TRIGGER_RISING |
+					IRQF_ONESHOT, "s5m87xx-ono", s5m87xx);
+		break;
+	default:
+		break;
+	}
+
+	if (ret)
+		dev_err(s5m87xx->dev, "Failed to request IRQ %d: %d\n",
+			s5m87xx->ono, ret);
+
+	return 0;
+}
+
+void s5m_irq_exit(struct s5m87xx_dev *s5m87xx)
+{
+	if (s5m87xx->ono)
+		free_irq(s5m87xx->ono, s5m87xx);
+
+	if (s5m87xx->irq)
+		free_irq(s5m87xx->irq, s5m87xx);
+}