Linux-libre 4.8.2-gnupck-4.8.2-gnu

1 files changed, 444 insertions, 0 deletions

diff --git a/drivers/gpio/gpio-merrifield.c b/drivers/gpio/gpio-merrifield.c
new file mode 100644
index 000000000..45b51278b
--- /dev/null
+++ b/drivers/gpio/gpio-merrifield.c
@@ -0,0 +1,444 @@
+/*
+ * Intel Merrifield SoC GPIO driver
+ *
+ * Copyright (c) 2016 Intel Corporation.
+ * Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
+ *
+ * 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/driver.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/pinctrl/consumer.h>
+
+#define GCCR		0x000	/* controller configuration */
+#define GPLR		0x004	/* pin level r/o */
+#define GPDR		0x01c	/* pin direction */
+#define GPSR		0x034	/* pin set w/o */
+#define GPCR		0x04c	/* pin clear w/o */
+#define GRER		0x064	/* rising edge detect */
+#define GFER		0x07c	/* falling edge detect */
+#define GFBR		0x094	/* glitch filter bypass */
+#define GIMR		0x0ac	/* interrupt mask */
+#define GISR		0x0c4	/* interrupt source */
+#define GITR		0x300	/* input type */
+#define GLPR		0x318	/* level input polarity */
+#define GWMR		0x400	/* wake mask */
+#define GWSR		0x418	/* wake source */
+#define GSIR		0xc00	/* secure input */
+
+/* Intel Merrifield has 192 GPIO pins */
+#define MRFLD_NGPIO	192
+
+struct mrfld_gpio_pinrange {
+	unsigned int gpio_base;
+	unsigned int pin_base;
+	unsigned int npins;
+};
+
+#define GPIO_PINRANGE(gstart, gend, pstart)		\
+	{						\
+		.gpio_base = (gstart),			\
+		.pin_base = (pstart),			\
+		.npins = (gend) - (gstart) + 1,		\
+	}
+
+struct mrfld_gpio {
+	struct gpio_chip	chip;
+	void __iomem		*reg_base;
+	raw_spinlock_t		lock;
+	struct device		*dev;
+};
+
+static const struct mrfld_gpio_pinrange mrfld_gpio_ranges[] = {
+	GPIO_PINRANGE(0, 11, 146),
+	GPIO_PINRANGE(12, 13, 144),
+	GPIO_PINRANGE(14, 15, 35),
+	GPIO_PINRANGE(16, 16, 164),
+	GPIO_PINRANGE(17, 18, 105),
+	GPIO_PINRANGE(19, 22, 101),
+	GPIO_PINRANGE(23, 30, 107),
+	GPIO_PINRANGE(32, 43, 67),
+	GPIO_PINRANGE(44, 63, 195),
+	GPIO_PINRANGE(64, 67, 140),
+	GPIO_PINRANGE(68, 69, 165),
+	GPIO_PINRANGE(70, 71, 65),
+	GPIO_PINRANGE(72, 76, 228),
+	GPIO_PINRANGE(77, 86, 37),
+	GPIO_PINRANGE(87, 87, 48),
+	GPIO_PINRANGE(88, 88, 47),
+	GPIO_PINRANGE(89, 96, 49),
+	GPIO_PINRANGE(97, 97, 34),
+	GPIO_PINRANGE(102, 119, 83),
+	GPIO_PINRANGE(120, 123, 79),
+	GPIO_PINRANGE(124, 135, 115),
+	GPIO_PINRANGE(137, 142, 158),
+	GPIO_PINRANGE(154, 163, 24),
+	GPIO_PINRANGE(164, 176, 215),
+	GPIO_PINRANGE(177, 189, 127),
+	GPIO_PINRANGE(190, 191, 178),
+};
+
+static void __iomem *gpio_reg(struct gpio_chip *chip, unsigned int offset,
+			      unsigned int reg_type_offset)
+{
+	struct mrfld_gpio *priv = gpiochip_get_data(chip);
+	u8 reg = offset / 32;
+
+	return priv->reg_base + reg_type_offset + reg * 4;
+}
+
+static int mrfld_gpio_get(struct gpio_chip *chip, unsigned int offset)
+{
+	void __iomem *gplr = gpio_reg(chip, offset, GPLR);
+
+	return !!(readl(gplr) & BIT(offset % 32));
+}
+
+static void mrfld_gpio_set(struct gpio_chip *chip, unsigned int offset,
+			   int value)
+{
+	struct mrfld_gpio *priv = gpiochip_get_data(chip);
+	void __iomem *gpsr, *gpcr;
+	unsigned long flags;
+
+	raw_spin_lock_irqsave(&priv->lock, flags);
+
+	if (value) {
+		gpsr = gpio_reg(chip, offset, GPSR);
+		writel(BIT(offset % 32), gpsr);
+	} else {
+		gpcr = gpio_reg(chip, offset, GPCR);
+		writel(BIT(offset % 32), gpcr);
+	}
+
+	raw_spin_unlock_irqrestore(&priv->lock, flags);
+}
+
+static int mrfld_gpio_direction_input(struct gpio_chip *chip,
+				      unsigned int offset)
+{
+	struct mrfld_gpio *priv = gpiochip_get_data(chip);
+	void __iomem *gpdr = gpio_reg(chip, offset, GPDR);
+	unsigned long flags;
+	u32 value;
+
+	raw_spin_lock_irqsave(&priv->lock, flags);
+
+	value = readl(gpdr);
+	value &= ~BIT(offset % 32);
+	writel(value, gpdr);
+
+	raw_spin_unlock_irqrestore(&priv->lock, flags);
+
+	return 0;
+}
+
+static int mrfld_gpio_direction_output(struct gpio_chip *chip,
+				       unsigned int offset, int value)
+{
+	struct mrfld_gpio *priv = gpiochip_get_data(chip);
+	void __iomem *gpdr = gpio_reg(chip, offset, GPDR);
+	unsigned long flags;
+
+	mrfld_gpio_set(chip, offset, value);
+
+	raw_spin_lock_irqsave(&priv->lock, flags);
+
+	value = readl(gpdr);
+	value |= BIT(offset % 32);
+	writel(value, gpdr);
+
+	raw_spin_unlock_irqrestore(&priv->lock, flags);
+
+	return 0;
+}
+
+static void mrfld_irq_ack(struct irq_data *d)
+{
+	struct mrfld_gpio *priv = irq_data_get_irq_chip_data(d);
+	u32 gpio = irqd_to_hwirq(d);
+	void __iomem *gisr = gpio_reg(&priv->chip, gpio, GISR);
+	unsigned long flags;
+
+	raw_spin_lock_irqsave(&priv->lock, flags);
+
+	writel(BIT(gpio % 32), gisr);
+
+	raw_spin_unlock_irqrestore(&priv->lock, flags);
+}
+
+static void mrfld_irq_unmask_mask(struct irq_data *d, bool unmask)
+{
+	struct mrfld_gpio *priv = irq_data_get_irq_chip_data(d);
+	u32 gpio = irqd_to_hwirq(d);
+	void __iomem *gimr = gpio_reg(&priv->chip, gpio, GIMR);
+	unsigned long flags;
+	u32 value;
+
+	raw_spin_lock_irqsave(&priv->lock, flags);
+
+	if (unmask)
+		value = readl(gimr) | BIT(gpio % 32);
+	else
+		value = readl(gimr) & ~BIT(gpio % 32);
+	writel(value, gimr);
+
+	raw_spin_unlock_irqrestore(&priv->lock, flags);
+}
+
+static void mrfld_irq_mask(struct irq_data *d)
+{
+	mrfld_irq_unmask_mask(d, false);
+}
+
+static void mrfld_irq_unmask(struct irq_data *d)
+{
+	mrfld_irq_unmask_mask(d, true);
+}
+
+static int mrfld_irq_set_type(struct irq_data *d, unsigned int type)
+{
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+	struct mrfld_gpio *priv = gpiochip_get_data(gc);
+	u32 gpio = irqd_to_hwirq(d);
+	void __iomem *grer = gpio_reg(&priv->chip, gpio, GRER);
+	void __iomem *gfer = gpio_reg(&priv->chip, gpio, GFER);
+	void __iomem *gitr = gpio_reg(&priv->chip, gpio, GITR);
+	void __iomem *glpr = gpio_reg(&priv->chip, gpio, GLPR);
+	unsigned long flags;
+	u32 value;
+
+	raw_spin_lock_irqsave(&priv->lock, flags);
+
+	if (type & IRQ_TYPE_EDGE_RISING)
+		value = readl(grer) | BIT(gpio % 32);
+	else
+		value = readl(grer) & ~BIT(gpio % 32);
+	writel(value, grer);
+
+	if (type & IRQ_TYPE_EDGE_FALLING)
+		value = readl(gfer) | BIT(gpio % 32);
+	else
+		value = readl(gfer) & ~BIT(gpio % 32);
+	writel(value, gfer);
+
+	/*
+	 * To prevent glitches from triggering an unintended level interrupt,
+	 * configure GLPR register first and then configure GITR.
+	 */
+	if (type & IRQ_TYPE_LEVEL_LOW)
+		value = readl(glpr) | BIT(gpio % 32);
+	else
+		value = readl(glpr) & ~BIT(gpio % 32);
+	writel(value, glpr);
+
+	if (type & IRQ_TYPE_LEVEL_MASK) {
+		value = readl(gitr) | BIT(gpio % 32);
+		writel(value, gitr);
+
+		irq_set_handler_locked(d, handle_level_irq);
+	} else if (type & IRQ_TYPE_EDGE_BOTH) {
+		value = readl(gitr) & ~BIT(gpio % 32);
+		writel(value, gitr);
+
+		irq_set_handler_locked(d, handle_edge_irq);
+	}
+
+	raw_spin_unlock_irqrestore(&priv->lock, flags);
+
+	return 0;
+}
+
+static int mrfld_irq_set_wake(struct irq_data *d, unsigned int on)
+{
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+	struct mrfld_gpio *priv = gpiochip_get_data(gc);
+	u32 gpio = irqd_to_hwirq(d);
+	void __iomem *gwmr = gpio_reg(&priv->chip, gpio, GWMR);
+	void __iomem *gwsr = gpio_reg(&priv->chip, gpio, GWSR);
+	unsigned long flags;
+	u32 value;
+
+	raw_spin_lock_irqsave(&priv->lock, flags);
+
+	/* Clear the existing wake status */
+	writel(BIT(gpio % 32), gwsr);
+
+	if (on)
+		value = readl(gwmr) | BIT(gpio % 32);
+	else
+		value = readl(gwmr) & ~BIT(gpio % 32);
+	writel(value, gwmr);
+
+	raw_spin_unlock_irqrestore(&priv->lock, flags);
+
+	dev_dbg(priv->dev, "%sable wake for gpio %u\n", on ? "en" : "dis", gpio);
+	return 0;
+}
+
+static struct irq_chip mrfld_irqchip = {
+	.name		= "gpio-merrifield",
+	.irq_ack	= mrfld_irq_ack,
+	.irq_mask	= mrfld_irq_mask,
+	.irq_unmask	= mrfld_irq_unmask,
+	.irq_set_type	= mrfld_irq_set_type,
+	.irq_set_wake	= mrfld_irq_set_wake,
+};
+
+static void mrfld_irq_handler(struct irq_desc *desc)
+{
+	struct gpio_chip *gc = irq_desc_get_handler_data(desc);
+	struct mrfld_gpio *priv = gpiochip_get_data(gc);
+	struct irq_chip *irqchip = irq_desc_get_chip(desc);
+	unsigned long base, gpio;
+
+	chained_irq_enter(irqchip, desc);
+
+	/* Check GPIO controller to check which pin triggered the interrupt */
+	for (base = 0; base < priv->chip.ngpio; base += 32) {
+		void __iomem *gisr = gpio_reg(&priv->chip, base, GISR);
+		void __iomem *gimr = gpio_reg(&priv->chip, base, GIMR);
+		unsigned long pending, enabled;
+
+		pending = readl(gisr);
+		enabled = readl(gimr);
+
+		/* Only interrupts that are enabled */
+		pending &= enabled;
+
+		for_each_set_bit(gpio, &pending, 32) {
+			unsigned int irq;
+
+			irq = irq_find_mapping(gc->irqdomain, base + gpio);
+			generic_handle_irq(irq);
+		}
+	}
+
+	chained_irq_exit(irqchip, desc);
+}
+
+static void mrfld_irq_init_hw(struct mrfld_gpio *priv)
+{
+	void __iomem *reg;
+	unsigned int base;
+
+	for (base = 0; base < priv->chip.ngpio; base += 32) {
+		/* Clear the rising-edge detect register */
+		reg = gpio_reg(&priv->chip, base, GRER);
+		writel(0, reg);
+		/* Clear the falling-edge detect register */
+		reg = gpio_reg(&priv->chip, base, GFER);
+		writel(0, reg);
+	}
+}
+
+static int mrfld_gpio_probe(struct pci_dev *pdev, const struct pci_device_id *id)
+{
+	const struct mrfld_gpio_pinrange *range;
+	struct mrfld_gpio *priv;
+	u32 gpio_base, irq_base;
+	void __iomem *base;
+	unsigned int i;
+	int retval;
+
+	retval = pcim_enable_device(pdev);
+	if (retval)
+		return retval;
+
+	retval = pcim_iomap_regions(pdev, BIT(1) | BIT(0), pci_name(pdev));
+	if (retval) {
+		dev_err(&pdev->dev, "I/O memory mapping error\n");
+		return retval;
+	}
+
+	base = pcim_iomap_table(pdev)[1];
+
+	irq_base = readl(base);
+	gpio_base = readl(sizeof(u32) + base);
+
+	/* Release the IO mapping, since we already get the info from BAR1 */
+	pcim_iounmap_regions(pdev, BIT(1));
+
+	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv) {
+		dev_err(&pdev->dev, "can't allocate chip data\n");
+		return -ENOMEM;
+	}
+
+	priv->dev = &pdev->dev;
+	priv->reg_base = pcim_iomap_table(pdev)[0];
+
+	priv->chip.label = dev_name(&pdev->dev);
+	priv->chip.parent = &pdev->dev;
+	priv->chip.request = gpiochip_generic_request;
+	priv->chip.free = gpiochip_generic_free;
+	priv->chip.direction_input = mrfld_gpio_direction_input;
+	priv->chip.direction_output = mrfld_gpio_direction_output;
+	priv->chip.get = mrfld_gpio_get;
+	priv->chip.set = mrfld_gpio_set;
+	priv->chip.base = gpio_base;
+	priv->chip.ngpio = MRFLD_NGPIO;
+	priv->chip.can_sleep = false;
+
+	raw_spin_lock_init(&priv->lock);
+
+	pci_set_drvdata(pdev, priv);
+	retval = devm_gpiochip_add_data(&pdev->dev, &priv->chip, priv);
+	if (retval) {
+		dev_err(&pdev->dev, "gpiochip_add error %d\n", retval);
+		return retval;
+	}
+
+	for (i = 0; i < ARRAY_SIZE(mrfld_gpio_ranges); i++) {
+		range = &mrfld_gpio_ranges[i];
+		retval = gpiochip_add_pin_range(&priv->chip,
+						"pinctrl-merrifield",
+						range->gpio_base,
+						range->pin_base,
+						range->npins);
+		if (retval) {
+			dev_err(&pdev->dev, "failed to add GPIO pin range\n");
+			return retval;
+		}
+	}
+
+	retval = gpiochip_irqchip_add(&priv->chip, &mrfld_irqchip, irq_base,
+				      handle_simple_irq, IRQ_TYPE_NONE);
+	if (retval) {
+		dev_err(&pdev->dev, "could not connect irqchip to gpiochip\n");
+		return retval;
+	}
+
+	mrfld_irq_init_hw(priv);
+
+	gpiochip_set_chained_irqchip(&priv->chip, &mrfld_irqchip, pdev->irq,
+				     mrfld_irq_handler);
+
+	return 0;
+}
+
+static const struct pci_device_id mrfld_gpio_ids[] = {
+	{ PCI_VDEVICE(INTEL, 0x1199) },
+	{ }
+};
+MODULE_DEVICE_TABLE(pci, mrfld_gpio_ids);
+
+static struct pci_driver mrfld_gpio_driver = {
+	.name		= "gpio-merrifield",
+	.id_table	= mrfld_gpio_ids,
+	.probe		= mrfld_gpio_probe,
+};
+
+module_pci_driver(mrfld_gpio_driver);
+
+MODULE_AUTHOR("Andy Shevchenko <andriy.shevchenko@linux.intel.com>");
+MODULE_DESCRIPTION("Intel Merrifield SoC GPIO driver");
+MODULE_LICENSE("GPL v2");