Message-Id: <1410176880-22524-2-git-send-email-mika.westerberg@linux.intel.com>
Date:	Mon,  8 Sep 2014 14:48:00 +0300
From:	Mika Westerberg <mika.westerberg@...ux.intel.com>
To:	Linus Walleij <linus.walleij@...aro.org>,
	Alexandre Courbot <gnurou@...il.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	Ning Li <ning.li@...el.com>, Alan Cox <alan@...ux.intel.com>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	Mark Brown <broonie@...aro.org>, linux-kernel@...r.kernel.org,
	linux-gpio@...r.kernel.org
Subject: [PATCH 2/2] gpio: Add support for Intel Cherryview/Braswell GPIO controller

From: Ning Li <ning.li@...el.com>

This driver supports the GPIO controllers found in newer Intel SoCs like
Cherryview and Braswell.

Signed-off-by: Ning Li <ning.li@...el.com>
Signed-off-by: Alan Cox <alan@...ux.intel.com>
Signed-off-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
---
 drivers/gpio/Kconfig           |   8 +
 drivers/gpio/Makefile          |   1 +
 drivers/gpio/gpio-cherryview.c | 947 +++++++++++++++++++++++++++++++++++++++++
 3 files changed, 956 insertions(+)
 create mode 100644 drivers/gpio/gpio-cherryview.c

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 9de1515e5808..73a317d7b7bf 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -736,6 +736,14 @@ config GPIO_INTEL_MID
 	help
 	  Say Y here to support Intel Mid GPIO.
 
+config GPIO_CHERRYVIEW
+	tristate "Intel CherryView/Braswell GPIO support"
+	depends on ACPI
+	select GPIOLIB_IRQCHIP
+	help
+	  Enable support for GPIO host controllers found on Intel SoCs
+	  such as CherryView and Braswell.
+
 config GPIO_PCH
 	tristate "Intel EG20T PCH/LAPIS Semiconductor IOH(ML7223/ML7831) GPIO"
 	depends on PCI && (X86_32 || COMPILE_TEST)
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 5d024e396622..1162b08564a7 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -20,6 +20,7 @@ obj-$(CONFIG_GPIO_AMD8111)	+= gpio-amd8111.o
 obj-$(CONFIG_GPIO_ARIZONA)	+= gpio-arizona.o
 obj-$(CONFIG_GPIO_BCM_KONA)	+= gpio-bcm-kona.o
 obj-$(CONFIG_GPIO_BT8XX)	+= gpio-bt8xx.o
+obj-$(CONFIG_GPIO_CHERRYVIEW)	+= gpio-cherryview.o
 obj-$(CONFIG_GPIO_CLPS711X)	+= gpio-clps711x.o
 obj-$(CONFIG_GPIO_CS5535)	+= gpio-cs5535.o
 obj-$(CONFIG_GPIO_CRYSTAL_COVE)	+= gpio-crystalcove.o
diff --git a/drivers/gpio/gpio-cherryview.c b/drivers/gpio/gpio-cherryview.c
new file mode 100644
index 000000000000..ba45741a345c
--- /dev/null
+++ b/drivers/gpio/gpio-cherryview.c
@@ -0,0 +1,947 @@
+/*
+ * GPIO controller driver for Intel Cherryview/Braswell.
+ *
+ * Copyright (C) 2014, Intel Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/bitops.h>
+#include <linux/interrupt.h>
+#include <linux/gpio/driver.h>
+#include <linux/seq_file.h>
+#include <linux/ioport.h>
+#include <linux/acpi.h>
+#include <linux/platform_device.h>
+
+#define FAMILY0_PAD_REGS_OFF	0x4400
+#define FAMILY_PAD_REGS_SIZE	0x400
+#define MAX_FAMILY_PAD_GPIO_NO	15
+#define GPIO_REGS_SIZE		8
+
+#define CV_PADCTRL0_REG		0x000
+#define CV_PADCTRL1_REG		0x004
+#define CV_INT_STAT_REG		0x300
+#define CV_INT_MASK_REG		0x380
+
+#define CV_GPIO_RX_STAT		BIT(0)
+#define CV_GPIO_TX_STAT		BIT(1)
+#define CV_GPIO_EN		BIT(15)
+
+#define CV_CFG_LOCK_MASK	BIT(31)
+#define CV_INT_CFG_MASK		(BIT(0) | BIT(1) | BIT(2))
+#define CV_PAD_MODE_MASK	(0xf << 16)
+
+#define CV_GPIO_CFG_MASK	(BIT(8) | BIT(9) | BIT(10))
+#define CV_GPIO_TX_EN		(1 << 8)
+#define CV_GPIO_RX_EN		(2 << 8)
+
+#define CV_INV_RX_DATA		BIT(6)
+
+#define CV_INT_SEL_MASK		(0xf << 28)
+
+enum {
+	CV_INTR_DISABLE,
+	CV_TRIG_EDGE_FALLING,
+	CV_TRIG_EDGE_RISING,
+	CV_TRIG_EDGE_BOTH,
+	CV_TRIG_LEVEL,
+};
+
+struct chv_gpio_bank {
+	const char *name;
+	const char *uid;
+	const char * const *pads;
+	size_t npads;
+};
+
+struct chv_gpio {
+	struct gpio_chip chip;
+	spinlock_t lock;
+	void __iomem *reg_base;
+	int intr_lines[16];
+	const struct chv_gpio_bank *bank;
+};
+
+static const char * const north_pads[] = {
+	"GPIO_DFX_0",
+	"GPIO_DFX_3",
+	"GPIO_DFX_7",
+	"GPIO_DFX_1",
+	"GPIO_DFX_5",
+	"GPIO_DFX_4",
+	"GPIO_DFX_8",
+	"GPIO_DFX_2",
+	"GPIO_DFX_6",
+
+	[9 ... 14] = 0,
+
+	"GPIO_SUS0",
+	"SEC_GPIO_SUS10",
+	"GPIO_SUS3",
+	"GPIO_SUS7",
+	"GPIO_SUS1",
+	"GPIO_SUS5",
+	"SEC_GPIO_SUS11",
+	"GPIO_SUS4",
+	"SEC_GPIO_SUS8",
+	"GPIO_SUS2",
+	"GPIO_SUS6",
+	"CX_PREQ_B",
+	"SEC_GPIO_SUS9",
+
+	[28 ... 29] = 0,
+
+	"TRST_B",
+	"TCK",
+	"PROCHOT_B",
+	"SVIDO_DATA",
+	"TMS",
+	"CX_PRDY_B_2",
+	"TDO_2",
+	"CX_PRDY_B",
+	"SVIDO_ALERT_B",
+	"TDO",
+	"SVIDO_CLK",
+	"TDI",
+
+	[42 ... 44] = 0,
+
+	"GP_CAMERASB_05",
+	"GP_CAMERASB_02",
+	"GP_CAMERASB_08",
+	"GP_CAMERASB_00",
+	"GP_CAMERASB_06",
+	"GP_CAMERASB_10",
+	"GP_CAMERASB_03",
+	"GP_CAMERASB_09",
+	"GP_CAMERASB_01",
+	"GP_CAMERASB_07",
+	"GP_CAMERASB_11",
+	"GP_CAMERASB_04",
+
+	[57 ... 59] = 0,
+
+	"PANEL0_BKLTEN",
+	"HV_DDI0_HPD",
+	"HV_DDI2_DDC_SDA",
+	"PANEL1_BKLTCTL",
+	"HV_DDI1_HPD",
+	"PANEL0_BKLTCTL",
+	"HV_DDI0_DDC_SDA",
+	"HV_DDI2_DDC_SCL",
+	"HV_DDI2_HPD",
+	"PANEL1_VDDEN",
+	"PANEL1_BKLTEN",
+	"HV_DDI0_DDC_SCL",
+	"PANEL0_VDDEN",
+};
+
+static const char * const southeast_pads[] = {
+	"MF_PLT_CLK0",
+	"PWM1",
+	"MF_PLT_CLK1",
+	"MF_PLT_CLK4",
+	"MF_PLT_CLK3",
+	"PWM0",
+	"MF_PLT_CLK5",
+	"MF_PLT_CLK2",
+
+	[9 ... 14] = 0,
+
+	"SDMMC2_D3_CD_B",
+	"SDMMC1_CLK",
+	"SDMMC1_D0",
+	"SDMMC2_D1",
+	"SDMMC2_CLK",
+	"SDMMC1_D2",
+	"SDMMC2_D2",
+	"SDMMC2_CMD",
+	"SDMMC1_CMD",
+	"SDMMC1_D1",
+	"SDMMC2_D0",
+	"SDMMC1_D3_CD_B",
+
+	[27 ... 29] = 0,
+
+	"SDMMC3_D1",
+	"SDMMC3_CLK",
+	"SDMMC3_D3",
+	"SDMMC3_D2",
+	"SDMMC3_CMD",
+	"SDMMC3_D0",
+
+	[36 ... 44] = 0,
+
+	"MF_LPC_AD2",
+	"LPC_CLKRUNB",
+	"MF_LPC_AD0",
+	"LPC_FRAMEB",
+	"MF_LPC_CLKOUT1",
+	"MF_LPC_AD3",
+	"MF_LPC_CLKOUT0",
+	"MF_LPC_AD1",
+
+	[53 ... 59] = 0,
+
+	"SPI1_MISO",
+	"SPI1_CSO_B",
+	"SPI1_CLK",
+	"MMC1_D6",
+	"SPI1_MOSI",
+	"MMC1_D5",
+	"SPI1_CS1_B",
+	"MMC1_D4_SD_WE",
+	"MMC1_D7",
+	"MMC1_RCLK",
+
+	[70 ... 74] = 0,
+
+	"USB_OC1_B",
+	"PMU_RESETBUTTON_B",
+	"GPIO_ALERT",
+	"SDMMC3_PWR_EN_B",
+	"ILB_SERIRQ",
+	"USB_OC0_B",
+	"SDMMC3_CD_B",
+	"SPKR",
+	"SUSPWRDNACK",
+	"SPARE_PIN",
+	"SDMMC3_1P8_EN",
+};
+
+static const char * const east_pads[] = {
+	"PMU_SLP_S3_B",
+	"PMU_BATLOW_B",
+	"SUS_STAT_B",
+	"PMU_SLP_S0IX_B",
+	"PMU_AC_PRESENT",
+	"PMU_PLTRST_B",
+	"PMU_SUSCLK",
+	"PMU_SLP_LAN_B",
+	"PMU_PWRBTN_B",
+	"PMU_SLP_S4_B",
+	"PMU_WAKE_B",
+	"PMU_WAKE_LAN_B",
+
+	[12 ... 14] = 0,
+
+	"MF_ISH_GPIO_3",
+	"MF_ISH_GPIO_7",
+	"MF_ISH_I2C1_SCL",
+	"MF_ISH_GPIO_1",
+	"MF_ISH_GPIO_5",
+	"MF_ISH_GPIO_9",
+	"MF_ISH_GPIO_0",
+	"MF_ISH_GPIO_4",
+	"MF_ISH_GPIO_8",
+	"MF_ISH_GPIO_2",
+	"MF_ISH_GPIO_6",
+	"MF_ISH_I2C1_SDA",
+};
+
+static const char * const southwest_pads[] = {
+	"FST_SPI_D2",
+	"FST_SPI_D0",
+	"FST_SPI_CLK",
+	"FST_SPI_D3",
+	"FST_SPI_CS1_B",
+	"FST_SPI_D1",
+	"FST_SPI_CS0_B",
+	"FST_SPI_CS2_B",
+
+	[8 ... 14] = 0,
+
+	"UART1_RTS_B",
+	"UART1_RXD",
+	"UART2_RXD",
+	"UART1_CTS_B",
+	"UART2_RTS_B",
+	"UART1_TXD",
+	"UART2_TXD",
+	"UART2_CTS_B",
+
+	[23 ... 29] = 0,
+
+	"MF_HDA_CLK",
+	"MF_HDA_RSTB",
+	"MF_HDA_SDIO",
+	"MF_HDA_SDO",
+	"MF_HDA_DOCKRSTB",
+	"MF_HDA_SYNC",
+	"MF_HDA_SDI1",
+	"MF_HDA_DOCKENB",
+
+	[38 ... 44] = 0,
+
+	"I2C5_SDA",
+	"I2C4_SDA",
+	"I2C6_SDA",
+	"I2C5_SCL",
+	"I2C_NFC_SDA",
+	"I2C4_SCL",
+	"I2C6_SCL",
+	"I2C_NFC_SCL",
+
+	[53 ... 59] = 0,
+
+	"I2C1_SDA",
+	"I2C0_SDA",
+	"I2C2_SDA",
+	"I2C1_SCL",
+	"I2C3_SDA",
+	"I2C0_SCL",
+	"I2C2_SCL",
+	"I2C3_SCL",
+
+	[68 ... 74] = 0,
+
+	"SATA_GP0",
+	"SATA_GP1",
+	"SATA_LEDN",
+	"SATA_GP2",
+	"MF_SMB_ALERTB",
+	"SATA_GP3",
+	"MF_SMB_CLK",
+	"MF_SMB_DATA",
+
+	[83 ... 89] = 0,
+
+	"PCIE_CLKREQ0B",
+	"PCIE_CLKREQ1B",
+	"GP_SSP_2_CLK",
+	"PCIE_CLKREQ2B",
+	"GP_SSP_2_RXD",
+	"PCIE_CLKREQ3B",
+	"GP_SSP_2_FS",
+	"GP_SSP_2_TXD",
+};
+
+static const struct chv_gpio_bank chv_banks[] = {
+	{
+		.name = "SW",
+		.uid = "1",
+		.pads = southwest_pads,
+		.npads = ARRAY_SIZE(southwest_pads),
+	},
+	{
+		.name = "N",
+		.uid = "2",
+		.pads = north_pads,
+		.npads = ARRAY_SIZE(north_pads),
+	},
+	{
+		.name = "E",
+		.uid = "3",
+		.pads = east_pads,
+		.npads = ARRAY_SIZE(east_pads),
+	},
+	{
+		.name = "SE",
+		.uid = "4",
+		.pads = southeast_pads,
+		.npads = ARRAY_SIZE(southeast_pads),
+	},
+};
+
+#define to_chv_gpio(c)	container_of(c, struct chv_gpio, chip)
+
+static void __iomem *chv_gpio_reg(struct chv_gpio *cg, unsigned offset, int reg)
+{
+	u32 reg_offset;
+
+	if (reg == CV_INT_STAT_REG || reg == CV_INT_MASK_REG) {
+		reg_offset = 0;
+	} else {
+		reg_offset = FAMILY0_PAD_REGS_OFF +
+		      FAMILY_PAD_REGS_SIZE * (offset / MAX_FAMILY_PAD_GPIO_NO) +
+		      GPIO_REGS_SIZE * (offset % MAX_FAMILY_PAD_GPIO_NO);
+	}
+
+	return cg->reg_base + reg_offset + reg;
+}
+
+static inline void chv_writel(u32 value, void __iomem *reg)
+{
+	writel(value, reg);
+	/* simple readback to confirm the bus transferring done */
+	readl(reg);
+}
+
+/* When Pad Cfg is locked, driver can only change GPIOTXState or GPIORXState */
+static inline bool chv_gpio_pad_locked(struct chv_gpio *cg, unsigned offset)
+{
+	void __iomem *reg;
+
+	reg = chv_gpio_reg(cg, offset, CV_PADCTRL1_REG);
+	return readl(reg) & CV_CFG_LOCK_MASK;
+}
+
+static int chv_gpio_request(struct gpio_chip *chip, unsigned offset)
+{
+	struct chv_gpio *cg = to_chv_gpio(chip);
+	void __iomem *reg;
+	u32 value;
+
+	if (!cg->bank->pads[offset])
+		return -EINVAL;
+
+	if (chv_gpio_pad_locked(cg, offset))
+		return 0;
+
+	/* Disable interrupt generation */
+	reg = chv_gpio_reg(cg, offset, CV_PADCTRL1_REG);
+	value = readl(reg);
+	value &= ~(CV_INT_CFG_MASK | CV_INV_RX_DATA);
+	chv_writel(value, reg);
+
+	/* Switch to a GPIO mode */
+	reg = chv_gpio_reg(cg, offset, CV_PADCTRL0_REG);
+	value = readl(reg) | CV_GPIO_EN;
+	chv_writel(value, reg);
+
+	return 0;
+}
+
+static void chv_gpio_free(struct gpio_chip *chip, unsigned offset)
+{
+	struct chv_gpio *cg = to_chv_gpio(chip);
+	void __iomem *reg;
+	u32 value;
+
+	if (chv_gpio_pad_locked(cg, offset))
+		return;
+
+	reg = chv_gpio_reg(cg, offset, CV_PADCTRL0_REG);
+	value = readl(reg) & ~CV_GPIO_EN;
+	chv_writel(value, reg);
+}
+
+static void chv_update_irq_type(struct chv_gpio *cg, unsigned type,
+				void __iomem *reg)
+{
+	u32 value;
+
+	value = readl(reg);
+	value &= ~CV_INT_CFG_MASK;
+	value &= ~CV_INV_RX_DATA;
+
+	if (type & IRQ_TYPE_EDGE_BOTH) {
+		if ((type & IRQ_TYPE_EDGE_BOTH) == IRQ_TYPE_EDGE_BOTH)
+			value |= CV_TRIG_EDGE_BOTH;
+		else if (type & IRQ_TYPE_EDGE_RISING)
+			value |= CV_TRIG_EDGE_RISING;
+		else if (type & IRQ_TYPE_EDGE_FALLING)
+			value |= CV_TRIG_EDGE_FALLING;
+	} else if (type & IRQ_TYPE_LEVEL_MASK) {
+			value |= CV_TRIG_LEVEL;
+		if (type & IRQ_TYPE_LEVEL_LOW)
+			value |= CV_INV_RX_DATA;
+	}
+
+	chv_writel(value, reg);
+}
+
+/* BIOS programs IntSel bits for shared interrupt. GPIO driver follows it. */
+static void pad_intr_line_save(struct chv_gpio *cg, unsigned offset)
+{
+	void __iomem *reg = chv_gpio_reg(cg, offset, CV_PADCTRL0_REG);
+	u32 value, intr_line;
+
+	value = readl(reg);
+	intr_line = (value & CV_INT_SEL_MASK) >> 28;
+	cg->intr_lines[intr_line] = offset;
+}
+
+static int chv_irq_type(struct irq_data *d, unsigned type)
+{
+	struct chv_gpio *cg = irq_data_get_irq_chip_data(d);
+	u32 offset = irqd_to_hwirq(d);
+	void __iomem *reg;
+	unsigned long flags;
+
+	spin_lock_irqsave(&cg->lock, flags);
+
+	/*
+	 * Pins which can be used as shared interrupt are configured in
+	 * BIOS. Driver trusts BIOS configurations and assigns different
+	 * handler according to the irq type.
+	 *
+	 * Driver needs to save the mapping between each pin and
+	 * its interrupt line.
+	 * 1. If the pin cfg is locked in BIOS:
+	 *	Trust BIOS has programmed IntWakeCfg bits correctly,
+	 *	driver just needs to save the mapping.
+	 * 2. If the pin cfg is not locked in BIOS:
+	 *	Driver programs the IntWakeCfg bits and save the mapping.
+	 */
+	if (!chv_gpio_pad_locked(cg, offset)) {
+		reg = chv_gpio_reg(cg, offset, CV_PADCTRL1_REG);
+		chv_update_irq_type(cg, type, reg);
+	}
+
+	pad_intr_line_save(cg, offset);
+
+	if (type & IRQ_TYPE_EDGE_BOTH)
+		__irq_set_handler_locked(d->irq, handle_edge_irq);
+	else if (type & IRQ_TYPE_LEVEL_MASK)
+		__irq_set_handler_locked(d->irq, handle_level_irq);
+
+	spin_unlock_irqrestore(&cg->lock, flags);
+
+	return 0;
+}
+
+static int chv_gpio_get(struct gpio_chip *chip, unsigned offset)
+{
+	struct chv_gpio *cg = to_chv_gpio(chip);
+	unsigned long flags;
+	void __iomem *reg;
+	u32 value;
+	int ret;
+
+	reg = chv_gpio_reg(cg, offset, CV_PADCTRL0_REG);
+
+	spin_lock_irqsave(&cg->lock, flags);
+
+	value = readl(reg);
+	if (value & CV_GPIO_TX_EN)
+		ret = !!(value & CV_GPIO_TX_STAT);
+	else
+		ret = !!(value & CV_GPIO_RX_STAT);
+
+	spin_unlock_irqrestore(&cg->lock, flags);
+
+	return ret;
+}
+
+static void chv_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
+{
+	struct chv_gpio *cg = to_chv_gpio(chip);
+	void __iomem *reg;
+	unsigned long flags;
+	u32 old_val;
+
+	reg = chv_gpio_reg(cg, offset, CV_PADCTRL0_REG);
+
+	spin_lock_irqsave(&cg->lock, flags);
+
+	old_val = readl(reg);
+
+	if (value)
+		chv_writel(old_val | CV_GPIO_TX_STAT, reg);
+	else
+		chv_writel(old_val & ~CV_GPIO_TX_STAT, reg);
+
+	spin_unlock_irqrestore(&cg->lock, flags);
+}
+
+static int chv_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
+{
+	struct chv_gpio *cg = to_chv_gpio(chip);
+	unsigned long flags;
+	void __iomem *reg;
+	u32 value;
+
+	if (chv_gpio_pad_locked(cg, offset))
+		return 0;
+
+	reg = chv_gpio_reg(cg, offset, CV_PADCTRL0_REG);
+
+	spin_lock_irqsave(&cg->lock, flags);
+
+	value = readl(reg) & ~CV_GPIO_CFG_MASK;
+	/* Disable TX and Enable RX */
+	value |= CV_GPIO_RX_EN;
+	chv_writel(value, reg);
+
+	spin_unlock_irqrestore(&cg->lock, flags);
+
+	return 0;
+}
+
+static int chv_gpio_direction_output(struct gpio_chip *chip, unsigned offset,
+				     int value)
+{
+	struct chv_gpio *cg = to_chv_gpio(chip);
+	unsigned long flags;
+	void __iomem *reg;
+	u32 reg_val;
+
+	if (chv_gpio_pad_locked(cg, offset))
+		return 0;
+
+	reg = chv_gpio_reg(cg, offset, CV_PADCTRL0_REG);
+
+	spin_lock_irqsave(&cg->lock, flags);
+	reg_val = readl(reg) & ~CV_GPIO_CFG_MASK;
+	reg_val |= CV_GPIO_TX_EN;
+
+	/* Control TX State */
+	if (value)
+		reg_val |= CV_GPIO_TX_STAT;
+	else
+		reg_val &= ~CV_GPIO_TX_STAT;
+
+	chv_writel(reg_val, reg);
+
+	spin_unlock_irqrestore(&cg->lock, flags);
+	return 0;
+}
+
+static void chv_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
+{
+	struct chv_gpio *cg = to_chv_gpio(chip);
+	u32 ctrl0, ctrl1, offs;
+	unsigned long flags;
+	void __iomem *reg;
+	int i;
+
+	spin_lock_irqsave(&cg->lock, flags);
+
+	for (i = 0; i < cg->chip.ngpio; i++) {
+		const char *intcfg;
+		const char *label;
+		const char *value;
+		const char *dir;
+		char pin[8];
+
+		if (!cg->bank->pads[i])
+			continue;
+
+		offs = FAMILY0_PAD_REGS_OFF +
+		      FAMILY_PAD_REGS_SIZE * (i / MAX_FAMILY_PAD_GPIO_NO) +
+		      GPIO_REGS_SIZE * (i % MAX_FAMILY_PAD_GPIO_NO);
+
+		ctrl0 = readl(chv_gpio_reg(cg, i, CV_PADCTRL0_REG));
+		ctrl1 = readl(chv_gpio_reg(cg, i, CV_PADCTRL1_REG));
+
+		snprintf(pin, sizeof(pin), "%s%02d", cg->bank->name, i);
+
+		switch (ctrl1 & CV_INT_CFG_MASK) {
+		case CV_INTR_DISABLE:
+			intcfg = "disabled";
+			break;
+
+		case CV_TRIG_EDGE_FALLING:
+			intcfg = "falling";
+			break;
+
+		case CV_TRIG_EDGE_RISING:
+			intcfg = "rising";
+			break;
+
+		case CV_TRIG_EDGE_BOTH:
+			intcfg = "both";
+			break;
+
+		case CV_TRIG_LEVEL:
+			if (ctrl1 & CV_INV_RX_DATA)
+				intcfg = "low";
+			else
+				intcfg = "high";
+			break;
+
+		default:
+			intcfg = "unknown";
+			break;
+		}
+
+		switch ((ctrl0 & CV_GPIO_CFG_MASK) >> 8) {
+		case 0:
+			dir = "in out";
+			break;
+		case 1:
+			dir = "   out";
+			break;
+		case 2:
+			dir = "in";
+			break;
+		case 3:
+			dir = "HiZ";
+			break;
+		default:
+			dir = "unknown";
+			break;
+		}
+
+		if (ctrl0 & CV_GPIO_TX_EN)
+			value = ctrl0 & CV_GPIO_TX_STAT ? "high" : "low";
+		else
+			value = ctrl0 & CV_GPIO_RX_STAT ? "high" : "low";
+
+		seq_printf(s,
+			   "%c%-4s %-17s %-8s %-4s 0x%03x %d %-8s %02d 0x%08x 0x%08x",
+			   chv_gpio_pad_locked(cg, i) ? '*' : ' ',
+			   pin, cg->bank->pads[i], dir, value, offs,
+			   (ctrl0 & CV_PAD_MODE_MASK) >> 16, intcfg,
+			   (ctrl0 & CV_INT_SEL_MASK) >> 28, ctrl0, ctrl1);
+
+		label = gpiochip_is_requested(&cg->chip, i);
+		if (label)
+			seq_printf(s, " %s\n", label);
+		else
+			seq_puts(s, "\n");
+	}
+
+	reg = chv_gpio_reg(cg, 0, CV_INT_STAT_REG);
+	seq_printf(s, "CV_INT_STAT_REG: 0x%08x\n", readl(reg));
+
+	reg = chv_gpio_reg(cg, 0, CV_INT_MASK_REG);
+	seq_printf(s, "CV_INT_MASK_REG: 0x%08x\n", readl(reg));
+
+	for (i = 0; i < ARRAY_SIZE(cg->intr_lines); i++) {
+		if (cg->intr_lines[i] >= 0)
+			seq_printf(s, "intline: %d, offset: %d\n", i,
+				   cg->intr_lines[i]);
+	}
+
+	seq_puts(s, "\n");
+
+	spin_unlock_irqrestore(&cg->lock, flags);
+}
+
+static void chv_irq_unmask(struct irq_data *d)
+{
+	struct chv_gpio *cg = irq_data_get_irq_chip_data(d);
+	u32 offset = irqd_to_hwirq(d);
+	u32 value, intr_line;
+	unsigned long flags;
+	void __iomem *reg;
+
+	spin_lock_irqsave(&cg->lock, flags);
+
+	reg = chv_gpio_reg(cg, offset, CV_PADCTRL0_REG);
+	intr_line = (readl(reg) & CV_INT_SEL_MASK) >> 28;
+
+	reg = chv_gpio_reg(cg, 0, CV_INT_MASK_REG);
+	value = readl(reg);
+	value |= (1 << intr_line);
+	chv_writel(value, reg);
+
+	spin_unlock_irqrestore(&cg->lock, flags);
+}
+
+static void chv_irq_mask(struct irq_data *d)
+{
+	struct chv_gpio *cg = irq_data_get_irq_chip_data(d);
+	u32 offset = irqd_to_hwirq(d);
+	u32 value, intr_line;
+	unsigned long flags;
+	void __iomem *reg;
+
+	spin_lock_irqsave(&cg->lock, flags);
+
+	reg = chv_gpio_reg(cg, offset, CV_PADCTRL0_REG);
+	intr_line = (readl(reg) & CV_INT_SEL_MASK) >> 28;
+
+	value = readl(reg);
+	value &= ~(1 << intr_line);
+	chv_writel(value, reg);
+
+	spin_unlock_irqrestore(&cg->lock, flags);
+}
+
+static void chv_irq_ack(struct irq_data *d)
+{
+}
+
+static void chv_irq_shutdown(struct irq_data *d)
+{
+	struct chv_gpio *cg = irq_data_get_irq_chip_data(d);
+	u32 offset = irqd_to_hwirq(d);
+	void __iomem *reg;
+	unsigned long flags;
+
+	reg = chv_gpio_reg(cg, offset, CV_PADCTRL1_REG);
+
+	chv_irq_mask(d);
+
+	if (!chv_gpio_pad_locked(cg, offset)) {
+		spin_lock_irqsave(&cg->lock, flags);
+		chv_update_irq_type(cg, IRQ_TYPE_NONE, reg);
+		spin_unlock_irqrestore(&cg->lock, flags);
+	}
+}
+
+static struct irq_chip chv_irqchip = {
+	.name = "CHV-GPIO",
+	.irq_mask = chv_irq_mask,
+	.irq_unmask = chv_irq_unmask,
+	.irq_set_type = chv_irq_type,
+	.irq_ack = chv_irq_ack,
+	.irq_shutdown = chv_irq_shutdown,
+	.flags = IRQCHIP_SKIP_SET_WAKE,
+};
+
+static void chv_gpio_irq_handler(unsigned irq, struct irq_desc *desc)
+{
+	struct irq_data *data = irq_desc_get_irq_data(desc);
+	struct chv_gpio *cg = to_chv_gpio(irq_desc_get_handler_data(desc));
+	struct irq_chip *chip = irq_data_get_irq_chip(data);
+	u32 intr_line, mask, offset;
+	void __iomem *reg, *mask_reg;
+	u32 pending;
+
+	/* each GPIO controller has one INT_STAT reg */
+	reg = chv_gpio_reg(cg, 0, CV_INT_STAT_REG);
+	mask_reg = chv_gpio_reg(cg, 0, CV_INT_MASK_REG);
+	while ((pending = (readl(reg) & readl(mask_reg) & 0xffff))) {
+		unsigned irq;
+
+		intr_line = __ffs(pending);
+		mask = BIT(intr_line);
+		chv_writel(mask, reg);
+		offset = cg->intr_lines[intr_line];
+		if (unlikely(offset < 0)) {
+			dev_warn(cg->chip.dev, "unregistered shared irq\n");
+			continue;
+		}
+
+		irq = irq_find_mapping(cg->chip.irqdomain, offset);
+		generic_handle_irq(irq);
+	}
+
+	chip->irq_eoi(data);
+}
+
+static void chv_gpio_irq_init_hw(struct chv_gpio *cg)
+{
+	void __iomem *reg;
+
+	/* Mask all interrupts */
+	reg = chv_gpio_reg(cg, 0, CV_INT_MASK_REG);
+	chv_writel(0, reg);
+
+	reg = chv_gpio_reg(cg, 0, CV_INT_STAT_REG);
+	chv_writel(0xffff, reg);
+}
+
+static const struct gpio_chip chv_gpio_chip = {
+	.owner = THIS_MODULE,
+	.request = chv_gpio_request,
+	.free = chv_gpio_free,
+	.direction_input = chv_gpio_direction_input,
+	.direction_output = chv_gpio_direction_output,
+	.get = chv_gpio_get,
+	.set = chv_gpio_set,
+	.dbg_show = chv_gpio_dbg_show,
+	.base = -1,
+};
+
+static int chv_gpio_probe(struct platform_device *pdev)
+{
+	struct resource *mem_rc, *irq_rc;
+	const struct chv_gpio_bank *bank;
+	struct acpi_device *adev;
+	struct chv_gpio *cg;
+	int i, ret = 0;
+
+	adev = ACPI_COMPANION(&pdev->dev);
+	if (!adev)
+		return -ENODEV;
+
+	cg = devm_kzalloc(&pdev->dev, sizeof(*cg), GFP_KERNEL);
+	if (!cg)
+		return -ENOMEM;
+
+	for (i = 0; i < ARRAY_SIZE(chv_banks); i++) {
+		bank = &chv_banks[i];
+		if (!strcmp(adev->pnp.unique_id, bank->uid)) {
+			cg->bank = bank;
+			break;
+		}
+	}
+	if (i == ARRAY_SIZE(chv_banks))
+		return -ENODEV;
+
+	mem_rc = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+
+	cg->reg_base = devm_ioremap_resource(&pdev->dev, mem_rc);
+	if (IS_ERR(cg->reg_base))
+		return PTR_ERR(cg->reg_base);
+
+	spin_lock_init(&cg->lock);
+	cg->chip = chv_gpio_chip;
+	cg->chip.ngpio = cg->bank->npads;
+	cg->chip.label = dev_name(&pdev->dev);
+	cg->chip.dev = &pdev->dev;
+
+	/* Initialize interrupt lines array with negative value */
+	for (i = 0; i < ARRAY_SIZE(cg->intr_lines); i++)
+		cg->intr_lines[i] = -1;
+
+	ret = gpiochip_add(&cg->chip);
+	if (ret) {
+		dev_err(&pdev->dev, "Failed adding GPIO chip\n");
+		return ret;
+	}
+
+	irq_rc = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+	if (irq_rc && irq_rc->start) {
+		chv_gpio_irq_init_hw(cg);
+
+		ret = gpiochip_irqchip_add(&cg->chip, &chv_irqchip, 0,
+					   handle_simple_irq, IRQ_TYPE_NONE);
+		if (ret) {
+			dev_err(&pdev->dev, "Failed to add irqchip\n");
+			gpiochip_remove(&cg->chip);
+			return ret;
+		}
+
+		gpiochip_set_chained_irqchip(&cg->chip, &chv_irqchip,
+					     (unsigned)irq_rc->start,
+					     chv_gpio_irq_handler);
+	}
+
+	return 0;
+}
+
+static int chv_gpio_remove(struct platform_device *pdev)
+{
+	struct chv_gpio *cg = platform_get_drvdata(pdev);
+
+	gpiochip_remove(&cg->chip);
+	return 0;
+}
+
+static const struct acpi_device_id chv_gpio_acpi_match[] = {
+	{ "INT33FF" },
+	{ }
+};
+MODULE_DEVICE_TABLE(acpi, chv_gpio_acpi_match);
+
+static struct platform_driver chv_gpio_driver = {
+	.probe = chv_gpio_probe,
+	.remove = chv_gpio_remove,
+	.driver = {
+		.name = "chv_gpio",
+		.owner = THIS_MODULE,
+		.acpi_match_table = ACPI_PTR(chv_gpio_acpi_match),
+	},
+};
+
+static int __init chv_gpio_init(void)
+{
+	return platform_driver_register(&chv_gpio_driver);
+}
+subsys_initcall(chv_gpio_init);
+
+static void __exit chv_gpio_exit(void)
+{
+	platform_driver_unregister(&chv_gpio_driver);
+}
+module_exit(chv_gpio_exit);
+
+MODULE_DESCRIPTION("GPIO driver for Intel Cherryview/Braswell");
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Ning Li <ning.li@...el.com>");
+MODULE_AUTHOR("Alan Cox <alan@...ux.intel.com>");
+MODULE_AUTHOR("Mika Westerberg <mika.westerberg@...ux.intel.com>");
+MODULE_ALIAS("platform:chv_gpio");
-- 
2.1.0

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