--- /dev/null
+/*
+ * 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)
+{
+ void __iomem *gpsr, *gpcr;
+
+ 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);
+ }
+}
+
+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);
+
+ writel(BIT(gpio % 32), gisr);
+}
+
+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");
projects / cascardo / linux.git / commitdiff