Merge tag 'gpio-v3.12-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio

Pull GPIO updates from Linus Walleij:
 "This is the bulk of GPIO changes for the v3.12 series:

   - A new driver for the TZ1090 PDC which is used on the metag
     architecture.

   - A new driver for the Kontron ETX or COMexpress GPIO block.  This is
     found on some ETX x86 devices.

   - A new driver for the Fintek Super-I/O chips, used on some x86
     boards.

   - Added device tree probing on a few select GPIO blocks.

   - Drop the Exynos support from the Samsung GPIO driver.

     The Samsung maintainers have moved over to use the modernized pin
     control driver to provide GPIO for the modern platforms instead.

   - The usual bunch of non-critical fixes and cleanups"

* tag 'gpio-v3.12-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio: (36 commits)
  gpio: return -ENOTSUPP if debounce cannot be set
  gpio: improve error path in gpiolib
  gpio: add GPIO support for F71882FG and F71889F
  of: add vendor prefix for Microchip Technology Inc
  gpio: mcp23s08: rename the device tree property
  gpio: samsung: Drop support for Exynos SoCs
  gpio: pcf857x: Remove pdata argument to pcf857x_irq_domain_init()
  gpio: pcf857x: Sort headers alphabetically
  gpio: max7301: Reverting "Do not force SPI speed when using OF Platform"
  gpio: Fix bit masking in Kontron PLD GPIO driver
  gpio: pca953x: fix gpio input on gpio offsets >= 8
  drivers/gpio: simplify use of devm_ioremap_resource
  drivers/gpio/gpio-omap.c: convert comma to semicolon
  gpio-lynxpoint: Fix warning about unbalanced pm_runtime_enable
  gpio: Fix platform driver name in Kontron PLD GPIO driver
  gpio: adnp: Fix segfault if request_threaded_irq fails
  gpio: msm: Staticize local variable 'msm_gpio'
  gpio: gpiolib-of.c: make error message more meaningful by adding the node name and index
  gpio: use dev_get_platdata()
  gpio/mxc: add chained_irq_enter/exit() to mx2_gpio_irq_handler
  ...

1 files changed, 243 insertions, 0 deletions

diff --git a/drivers/gpio/gpio-tz1090-pdc.c b/drivers/gpio/gpio-tz1090-pdc.c
new file mode 100644
index 000000000000..f512da299b3d
--- /dev/null
+++ b/drivers/gpio/gpio-tz1090-pdc.c
@@ -0,0 +1,243 @@
+/*
+ * Toumaz Xenif TZ1090 PDC GPIO handling.
+ *
+ * Copyright (C) 2012-2013 Imagination Technologies Ltd.
+ *
+ * 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/bitops.h>
+#include <linux/gpio.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of_irq.h>
+#include <linux/pinctrl/consumer.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/syscore_ops.h>
+#include <asm/global_lock.h>
+
+/* Register offsets from SOC_GPIO_CONTROL0 */
+#define REG_SOC_GPIO_CONTROL0	0x00
+#define REG_SOC_GPIO_CONTROL1	0x04
+#define REG_SOC_GPIO_CONTROL2	0x08
+#define REG_SOC_GPIO_CONTROL3	0x0c
+#define REG_SOC_GPIO_STATUS	0x80
+
+/* PDC GPIOs go after normal GPIOs */
+#define GPIO_PDC_BASE		90
+#define GPIO_PDC_NGPIO		7
+
+/* Out of PDC gpios, only syswakes have irqs */
+#define GPIO_PDC_IRQ_FIRST	2
+#define GPIO_PDC_NIRQ		3
+
+/**
+ * struct tz1090_pdc_gpio - GPIO bank private data
+ * @chip:	Generic GPIO chip for GPIO bank
+ * @reg:	Base of registers, offset for this GPIO bank
+ * @irq:	IRQ numbers for Syswake GPIOs
+ *
+ * This is the main private data for the PDC GPIO driver. It encapsulates a
+ * gpio_chip, and the callbacks for the gpio_chip can access the private data
+ * with the to_pdc() macro below.
+ */
+struct tz1090_pdc_gpio {
+	struct gpio_chip chip;
+	void __iomem *reg;
+	int irq[GPIO_PDC_NIRQ];
+};
+#define to_pdc(c)	container_of(c, struct tz1090_pdc_gpio, chip)
+
+/* Register accesses into the PDC MMIO area */
+
+static inline void pdc_write(struct tz1090_pdc_gpio *priv, unsigned int reg_offs,
+		      unsigned int data)
+{
+	writel(data, priv->reg + reg_offs);
+}
+
+static inline unsigned int pdc_read(struct tz1090_pdc_gpio *priv,
+			     unsigned int reg_offs)
+{
+	return readl(priv->reg + reg_offs);
+}
+
+/* Generic GPIO interface */
+
+static int tz1090_pdc_gpio_direction_input(struct gpio_chip *chip,
+					   unsigned int offset)
+{
+	struct tz1090_pdc_gpio *priv = to_pdc(chip);
+	u32 value;
+	int lstat;
+
+	__global_lock2(lstat);
+	value = pdc_read(priv, REG_SOC_GPIO_CONTROL1);
+	value |= BIT(offset);
+	pdc_write(priv, REG_SOC_GPIO_CONTROL1, value);
+	__global_unlock2(lstat);
+
+	return 0;
+}
+
+static int tz1090_pdc_gpio_direction_output(struct gpio_chip *chip,
+					    unsigned int offset,
+					    int output_value)
+{
+	struct tz1090_pdc_gpio *priv = to_pdc(chip);
+	u32 value;
+	int lstat;
+
+	__global_lock2(lstat);
+	/* EXT_POWER doesn't seem to have an output value bit */
+	if (offset < 6) {
+		value = pdc_read(priv, REG_SOC_GPIO_CONTROL0);
+		if (output_value)
+			value |= BIT(offset);
+		else
+			value &= ~BIT(offset);
+		pdc_write(priv, REG_SOC_GPIO_CONTROL0, value);
+	}
+
+	value = pdc_read(priv, REG_SOC_GPIO_CONTROL1);
+	value &= ~BIT(offset);
+	pdc_write(priv, REG_SOC_GPIO_CONTROL1, value);
+	__global_unlock2(lstat);
+
+	return 0;
+}
+
+static int tz1090_pdc_gpio_get(struct gpio_chip *chip, unsigned int offset)
+{
+	struct tz1090_pdc_gpio *priv = to_pdc(chip);
+	return pdc_read(priv, REG_SOC_GPIO_STATUS) & BIT(offset);
+}
+
+static void tz1090_pdc_gpio_set(struct gpio_chip *chip, unsigned int offset,
+				int output_value)
+{
+	struct tz1090_pdc_gpio *priv = to_pdc(chip);
+	u32 value;
+	int lstat;
+
+	/* EXT_POWER doesn't seem to have an output value bit */
+	if (offset >= 6)
+		return;
+
+	__global_lock2(lstat);
+	value = pdc_read(priv, REG_SOC_GPIO_CONTROL0);
+	if (output_value)
+		value |= BIT(offset);
+	else
+		value &= ~BIT(offset);
+	pdc_write(priv, REG_SOC_GPIO_CONTROL0, value);
+	__global_unlock2(lstat);
+}
+
+static int tz1090_pdc_gpio_request(struct gpio_chip *chip, unsigned int offset)
+{
+	return pinctrl_request_gpio(chip->base + offset);
+}
+
+static void tz1090_pdc_gpio_free(struct gpio_chip *chip, unsigned int offset)
+{
+	pinctrl_free_gpio(chip->base + offset);
+}
+
+static int tz1090_pdc_gpio_to_irq(struct gpio_chip *chip, unsigned int offset)
+{
+	struct tz1090_pdc_gpio *priv = to_pdc(chip);
+	unsigned int syswake = offset - GPIO_PDC_IRQ_FIRST;
+	int irq;
+
+	/* only syswakes have irqs */
+	if (syswake >= GPIO_PDC_NIRQ)
+		return -EINVAL;
+
+	irq = priv->irq[syswake];
+	if (!irq)
+		return -EINVAL;
+
+	return irq;
+}
+
+static int tz1090_pdc_gpio_probe(struct platform_device *pdev)
+{
+	struct device_node *np = pdev->dev.of_node;
+	struct resource *res_regs;
+	struct tz1090_pdc_gpio *priv;
+	unsigned int i;
+
+	if (!np) {
+		dev_err(&pdev->dev, "must be instantiated via devicetree\n");
+		return -ENOENT;
+	}
+
+	res_regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res_regs) {
+		dev_err(&pdev->dev, "cannot find registers resource\n");
+		return -ENOENT;
+	}
+
+	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv) {
+		dev_err(&pdev->dev, "unable to allocate driver data\n");
+		return -ENOMEM;
+	}
+
+	/* Ioremap the registers */
+	priv->reg = devm_ioremap(&pdev->dev, res_regs->start,
+				 res_regs->end - res_regs->start);
+	if (!priv->reg) {
+		dev_err(&pdev->dev, "unable to ioremap registers\n");
+		return -ENOMEM;
+	}
+
+	/* Set up GPIO chip */
+	priv->chip.label		= "tz1090-pdc-gpio";
+	priv->chip.dev			= &pdev->dev;
+	priv->chip.direction_input	= tz1090_pdc_gpio_direction_input;
+	priv->chip.direction_output	= tz1090_pdc_gpio_direction_output;
+	priv->chip.get			= tz1090_pdc_gpio_get;
+	priv->chip.set			= tz1090_pdc_gpio_set;
+	priv->chip.free			= tz1090_pdc_gpio_free;
+	priv->chip.request		= tz1090_pdc_gpio_request;
+	priv->chip.to_irq		= tz1090_pdc_gpio_to_irq;
+	priv->chip.of_node		= np;
+
+	/* GPIO numbering */
+	priv->chip.base			= GPIO_PDC_BASE;
+	priv->chip.ngpio		= GPIO_PDC_NGPIO;
+
+	/* Map the syswake irqs */
+	for (i = 0; i < GPIO_PDC_NIRQ; ++i)
+		priv->irq[i] = irq_of_parse_and_map(np, i);
+
+	/* Add the GPIO bank */
+	gpiochip_add(&priv->chip);
+
+	return 0;
+}
+
+static struct of_device_id tz1090_pdc_gpio_of_match[] = {
+	{ .compatible = "img,tz1090-pdc-gpio" },
+	{ },
+};
+
+static struct platform_driver tz1090_pdc_gpio_driver = {
+	.driver = {
+		.name		= "tz1090-pdc-gpio",
+		.owner		= THIS_MODULE,
+		.of_match_table	= tz1090_pdc_gpio_of_match,
+	},
+	.probe		= tz1090_pdc_gpio_probe,
+};
+
+static int __init tz1090_pdc_gpio_init(void)
+{
+	return platform_driver_register(&tz1090_pdc_gpio_driver);
+}
+subsys_initcall(tz1090_pdc_gpio_init);