new file mode 100644
@@ -0,0 +1,74 @@
+Broadcom BCM2835 GPIO (and pinmux) controller
+
+The BCM2835 GPIO module is a combined GPIO controller, (GPIO) interrupt
+controller, and pinmux/control device.
+
+Required properties:
+- compatible: "brcm,bcm2835-gpio"
+- reg: Should contain the physical address of the GPIO module's registes.
+- gpio-controller: Marks the device node as a GPIO controller.
+- #gpio-cells : Should be two. The first cell is the pin number and the
+ second cell is used to specify optional parameters:
+ - bit 0 specifies polarity (0 for normal, 1 for inverted)
+- interrupts : The interrupt outputs from the controller. One interrupt per
+ individual bank followed by the "all banks" interrupt.
+- interrupt-controller: Marks the device node as an interrupt controller.
+- #interrupt-cells : Should be 2.
+ The first cell is the GPIO number.
+ The second cell is used to specify flags:
+ bits[3:0] trigger type and level flags:
+ 1 = low-to-high edge triggered.
+ 2 = high-to-low edge triggered.
+ 4 = active high level-sensitive.
+ 8 = active low level-sensitive.
+ Valid combinations are 1, 2, 3, 4, 8.
+
+Please refer to ../gpio/gpio.txt for a general description of GPIO bindings.
+
+Please refer to pinctrl-bindings.txt in this directory for details of the
+common pinctrl bindings used by client devices, including the meaning of the
+phrase "pin configuration node".
+
+Each pin configuration node lists the pin(s) to which it applies, and one or
+more of the mux function to select on those pin(s), and pull-up/down
+configuration. Each subnode only affects those parameters that are explicitly
+listed. In other words, a subnode that lists only a mux function implies no
+information about any pull configuration. Similarly, a subnode that lists only
+a pul parameter implies no information about the mux function.
+
+Required subnode-properties:
+- brcm,pins: An array of cells. Each cell contains the ID of a pin. Valid IDs
+ are the integer GPIO IDs; 0==GPIO0, 1==GPIO1, ... 53==GPIO53.
+
+Optional subnode-properties:
+- brcm,function: Integer, containing the function to mux to the pin(s):
+ 0: GPIO in
+ 1: GPIO out
+ 2: alt5
+ 3: alt4
+ 4: alt0
+ 5: alt1
+ 6: alt2
+ 7: alt3
+- brcm,pull: Integer, representing the pull-down/up to apply to the pin(s):
+ 0: none
+ 1: down
+ 2: up
+
+Each of brcm,function and brcm,pull may contain either a single value which
+will be applied to all pins in brcm,pins, or 1 value for each entry in
+brcm,pins.
+
+Example:
+
+ gpio: gpio {
+ compatible = "brcm,bcm2835-gpio";
+ reg = <0x2200000 0xb4>;
+ interrupts = <2 17>, <2 19>, <2 18>, <2 20>;
+
+ gpio-controller;
+ #gpio-cells = <2>;
+
+ interrupt-controller;
+ #interrupt-cells = <2>;
+ };
@@ -26,6 +26,11 @@ config DEBUG_PINCTRL
help
Say Y here to add some extra checks and diagnostics to PINCTRL calls.
+config PINCTRL_BCM2835
+ bool
+ select PINMUX
+ select PINCONF
+
config PINCTRL_IMX
bool
select PINMUX
@@ -9,6 +9,7 @@ ifeq ($(CONFIG_OF),y)
obj-$(CONFIG_PINCTRL) += devicetree.o
endif
obj-$(CONFIG_GENERIC_PINCONF) += pinconf-generic.o
+obj-$(CONFIG_PINCTRL_BCM2835) += pinctrl-bcm2835.o
obj-$(CONFIG_PINCTRL_IMX) += pinctrl-imx.o
obj-$(CONFIG_PINCTRL_IMX35) += pinctrl-imx35.o
obj-$(CONFIG_PINCTRL_IMX51) += pinctrl-imx51.o
new file mode 100644
@@ -0,0 +1,1075 @@
+/*
+ * Driver for Broadcom BCM2835 GPIO unit (pinctrl + GPIO)
+ *
+ * Copyright (C) 2012 Chris Boot, Simon Arlott, Stephen Warren
+ *
+ * This driver is inspired by:
+ * pinctrl-nomadik.c, please see original file for copyright information
+ * pinctrl-tegra.c, please see original file for copyright information
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/bitmap.h>
+#include <linux/bug.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/gpio.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/irq.h>
+#include <linux/irqdesc.h>
+#include <linux/irqdomain.h>
+#include <linux/irq.h>
+#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/of.h>
+#include <linux/of_irq.h>
+#include <linux/pinctrl/consumer.h>
+#include <linux/pinctrl/machine.h>
+#include <linux/pinctrl/pinconf.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/platform_device.h>
+#include <linux/seq_file.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/types.h>
+
+#define MODULE_NAME "pinctrl-bcm2835"
+#define BCM2835_NUM_GPIOS 54
+#define BCM2835_NUM_BANKS 2
+
+#define BCM2835_PIN_BITMAP_SZ \
+ DIV_ROUND_UP(BCM2835_NUM_GPIOS, sizeof(unsigned long) * 8)
+
+/* GPIO register offsets */
+#define GPFSEL0 0x0 /* Function Select */
+#define GPSET0 0x1c /* Pin Output Set */
+#define GPCLR0 0x28 /* Pin Output Clear */
+#define GPLEV0 0x34 /* Pin Level */
+#define GPEDS0 0x40 /* Pin Event Detect Status */
+#define GPREN0 0x4c /* Pin Rising Edge Detect Enable */
+#define GPFEN0 0x58 /* Pin Falling Edge Detect Enable */
+#define GPHEN0 0x64 /* Pin High Detect Enable */
+#define GPLEN0 0x70 /* Pin Low Detect Enable */
+#define GPAREN0 0x7c /* Pin Async Rising Edge Detect */
+#define GPAFEN0 0x88 /* Pin Async Falling Edge Detect */
+#define GPPUD 0x94 /* Pin Pull-up/down Enable */
+#define GPPUDCLK0 0x98 /* Pin Pull-up/down Enable Clock */
+
+#define FSEL_REG(p) (GPFSEL0 + (((p) / 10) * 4))
+#define FSEL_SHIFT(p) (((p) % 10) * 3)
+#define GPIO_REG_OFFSET(p) ((p) / 32)
+#define GPIO_REG_SHIFT(p) ((p) % 32)
+
+enum bcm2835_pinconf_param {
+ /* argument: bcm2835_pinconf_pull */
+ BCM2835_PINCONF_PARAM_PULL,
+};
+
+enum bcm2835_pinconf_pull {
+ BCM2835_PINCONFIG_PULL_NONE,
+ BCM2835_PINCONFIG_PULL_DOWN,
+ BCM2835_PINCONFIG_PULL_UP,
+};
+
+#define BCM2835_PINCONF_PACK(_param_, _arg_) ((_param_) << 16 | (_arg_))
+#define BCM2835_PINCONF_UNPACK_PARAM(_conf_) ((_conf_) >> 16)
+#define BCM2835_PINCONF_UNPACK_ARG(_conf_) ((_conf_) & 0xffff)
+
+struct bcm2835_gpio_irqdata {
+ struct bcm2835_pinctrl *pc;
+ int bank;
+};
+
+struct bcm2835_pinctrl {
+ struct device *dev;
+ void __iomem *base;
+ int irq[BCM2835_NUM_BANKS];
+
+ /* note: locking assumes each bank will have its own unsigned long */
+ unsigned long enabled_irq_map[BCM2835_NUM_BANKS];
+ unsigned int irq_type[BCM2835_NUM_GPIOS];
+
+ struct pinctrl_dev *pctl_dev;
+ struct irq_domain *irq_domain;
+ struct gpio_chip gpio_chip;
+ struct pinctrl_gpio_range gpio_range;
+
+ struct bcm2835_gpio_irqdata irq_data[BCM2835_NUM_BANKS];
+ spinlock_t irq_lock[BCM2835_NUM_BANKS];
+};
+
+static struct lock_class_key gpio_lock_class;
+
+/* pins are just named GPIO0..GPIO53 */
+#define BCM2835_GPIO_PIN(a) PINCTRL_PIN(a, "gpio" #a)
+struct pinctrl_pin_desc bcm2835_gpio_pins[] = {
+ BCM2835_GPIO_PIN(0),
+ BCM2835_GPIO_PIN(1),
+ BCM2835_GPIO_PIN(2),
+ BCM2835_GPIO_PIN(3),
+ BCM2835_GPIO_PIN(4),
+ BCM2835_GPIO_PIN(5),
+ BCM2835_GPIO_PIN(6),
+ BCM2835_GPIO_PIN(7),
+ BCM2835_GPIO_PIN(8),
+ BCM2835_GPIO_PIN(9),
+ BCM2835_GPIO_PIN(10),
+ BCM2835_GPIO_PIN(11),
+ BCM2835_GPIO_PIN(12),
+ BCM2835_GPIO_PIN(13),
+ BCM2835_GPIO_PIN(14),
+ BCM2835_GPIO_PIN(15),
+ BCM2835_GPIO_PIN(16),
+ BCM2835_GPIO_PIN(17),
+ BCM2835_GPIO_PIN(18),
+ BCM2835_GPIO_PIN(19),
+ BCM2835_GPIO_PIN(20),
+ BCM2835_GPIO_PIN(21),
+ BCM2835_GPIO_PIN(22),
+ BCM2835_GPIO_PIN(23),
+ BCM2835_GPIO_PIN(24),
+ BCM2835_GPIO_PIN(25),
+ BCM2835_GPIO_PIN(26),
+ BCM2835_GPIO_PIN(27),
+ BCM2835_GPIO_PIN(28),
+ BCM2835_GPIO_PIN(29),
+ BCM2835_GPIO_PIN(30),
+ BCM2835_GPIO_PIN(31),
+ BCM2835_GPIO_PIN(32),
+ BCM2835_GPIO_PIN(33),
+ BCM2835_GPIO_PIN(34),
+ BCM2835_GPIO_PIN(35),
+ BCM2835_GPIO_PIN(36),
+ BCM2835_GPIO_PIN(37),
+ BCM2835_GPIO_PIN(38),
+ BCM2835_GPIO_PIN(39),
+ BCM2835_GPIO_PIN(40),
+ BCM2835_GPIO_PIN(41),
+ BCM2835_GPIO_PIN(42),
+ BCM2835_GPIO_PIN(43),
+ BCM2835_GPIO_PIN(44),
+ BCM2835_GPIO_PIN(45),
+ BCM2835_GPIO_PIN(46),
+ BCM2835_GPIO_PIN(47),
+ BCM2835_GPIO_PIN(48),
+ BCM2835_GPIO_PIN(49),
+ BCM2835_GPIO_PIN(50),
+ BCM2835_GPIO_PIN(51),
+ BCM2835_GPIO_PIN(52),
+ BCM2835_GPIO_PIN(53),
+};
+
+/* one pin per group */
+static const char * const bcm2835_gpio_groups[] = {
+ "gpio0",
+ "gpio1",
+ "gpio2",
+ "gpio3",
+ "gpio4",
+ "gpio5",
+ "gpio6",
+ "gpio7",
+ "gpio8",
+ "gpio9",
+ "gpio10",
+ "gpio11",
+ "gpio12",
+ "gpio13",
+ "gpio14",
+ "gpio15",
+ "gpio16",
+ "gpio17",
+ "gpio18",
+ "gpio19",
+ "gpio20",
+ "gpio21",
+ "gpio22",
+ "gpio23",
+ "gpio24",
+ "gpio25",
+ "gpio26",
+ "gpio27",
+ "gpio28",
+ "gpio29",
+ "gpio30",
+ "gpio31",
+ "gpio32",
+ "gpio33",
+ "gpio34",
+ "gpio35",
+ "gpio36",
+ "gpio37",
+ "gpio38",
+ "gpio39",
+ "gpio40",
+ "gpio41",
+ "gpio42",
+ "gpio43",
+ "gpio44",
+ "gpio45",
+ "gpio46",
+ "gpio47",
+ "gpio48",
+ "gpio49",
+ "gpio50",
+ "gpio51",
+ "gpio52",
+ "gpio53",
+};
+
+enum bcm2835_fsel {
+ BCM2835_FSEL_GPIO_IN = 0,
+ BCM2835_FSEL_GPIO_OUT = 1,
+ BCM2835_FSEL_ALT0 = 4,
+ BCM2835_FSEL_ALT1 = 5,
+ BCM2835_FSEL_ALT2 = 6,
+ BCM2835_FSEL_ALT3 = 7,
+ BCM2835_FSEL_ALT4 = 3,
+ BCM2835_FSEL_ALT5 = 2,
+ BCM2835_FSEL_COUNT = 8,
+ BCM2835_FSEL_MASK = 0x7,
+};
+
+static const char * const bcm2835_functions[BCM2835_FSEL_COUNT] = {
+ [BCM2835_FSEL_GPIO_IN] = "gpio_in",
+ [BCM2835_FSEL_GPIO_OUT] = "gpio_out",
+ [BCM2835_FSEL_ALT0] = "alt0",
+ [BCM2835_FSEL_ALT1] = "alt1",
+ [BCM2835_FSEL_ALT2] = "alt2",
+ [BCM2835_FSEL_ALT3] = "alt3",
+ [BCM2835_FSEL_ALT4] = "alt4",
+ [BCM2835_FSEL_ALT5] = "alt5",
+};
+
+static const char * const irq_type_names[] = {
+ [IRQ_TYPE_NONE] = "none",
+ [IRQ_TYPE_EDGE_RISING] = "edge-rising",
+ [IRQ_TYPE_EDGE_FALLING] = "edge-falling",
+ [IRQ_TYPE_EDGE_BOTH] = "edge-both",
+ [IRQ_TYPE_LEVEL_HIGH] = "level-high",
+ [IRQ_TYPE_LEVEL_LOW] = "level-low",
+};
+
+static inline u32 bcm2835_gpio_rd(struct bcm2835_pinctrl *pc, unsigned reg)
+{
+ return readl(pc->base + reg);
+}
+
+static inline void bcm2835_gpio_wr(struct bcm2835_pinctrl *pc, unsigned reg,
+ u32 val)
+{
+ writel(val, pc->base + reg);
+}
+
+static inline int bcm2835_gpio_get_bit(struct bcm2835_pinctrl *pc, unsigned reg,
+ unsigned bit)
+{
+ reg += GPIO_REG_OFFSET(bit) * 4;
+ return (bcm2835_gpio_rd(pc, reg) >> GPIO_REG_SHIFT(bit)) & 1;
+}
+
+/* note NOT a read/modify/write cycle */
+static inline void bcm2835_gpio_set_bit(struct bcm2835_pinctrl *pc,
+ unsigned reg, unsigned bit)
+{
+ reg += GPIO_REG_OFFSET(bit) * 4;
+ bcm2835_gpio_wr(pc, reg, BIT(GPIO_REG_SHIFT(bit)));
+}
+
+static inline enum bcm2835_fsel bcm2835_pinctrl_fsel_get(
+ struct bcm2835_pinctrl *pc, unsigned pin)
+{
+ u32 val = bcm2835_gpio_rd(pc, FSEL_REG(pin));
+ enum bcm2835_fsel status = (val >> FSEL_SHIFT(pin)) & BCM2835_FSEL_MASK;
+
+ dev_dbg(pc->dev, "get %08x (%u => %s)\n", val, pin,
+ bcm2835_functions[status]);
+
+ return status;
+}
+
+static inline void bcm2835_pinctrl_fsel_set(
+ struct bcm2835_pinctrl *pc, unsigned pin,
+ enum bcm2835_fsel fsel)
+{
+ u32 val = bcm2835_gpio_rd(pc, FSEL_REG(pin));
+ enum bcm2835_fsel cur = (val >> FSEL_SHIFT(pin)) & BCM2835_FSEL_MASK;
+
+ dev_dbg(pc->dev, "read %08x (%u => %s)\n", val, pin,
+ bcm2835_functions[cur]);
+
+ if (cur == fsel)
+ return;
+
+ if (cur != BCM2835_FSEL_GPIO_IN && fsel != BCM2835_FSEL_GPIO_IN) {
+ /* always transition through GPIO_IN */
+ val &= ~(BCM2835_FSEL_MASK << FSEL_SHIFT(pin));
+ val |= BCM2835_FSEL_GPIO_IN << FSEL_SHIFT(pin);
+
+ dev_dbg(pc->dev, "trans %08x (%u <= %s)\n", val, pin,
+ bcm2835_functions[BCM2835_FSEL_GPIO_IN]);
+ bcm2835_gpio_wr(pc, FSEL_REG(pin), val);
+ }
+
+ val &= ~(BCM2835_FSEL_MASK << FSEL_SHIFT(pin));
+ val |= fsel << FSEL_SHIFT(pin);
+
+ dev_dbg(pc->dev, "write %08x (%u <= %s)\n", val, pin,
+ bcm2835_functions[fsel]);
+ bcm2835_gpio_wr(pc, FSEL_REG(pin), val);
+}
+
+static int bcm2835_gpio_request(struct gpio_chip *chip, unsigned offset)
+{
+ return pinctrl_request_gpio(chip->base + offset);
+}
+
+static void bcm2835_gpio_free(struct gpio_chip *chip, unsigned offset)
+{
+ pinctrl_free_gpio(chip->base + offset);
+}
+
+static int bcm2835_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
+{
+ return pinctrl_gpio_direction_input(chip->base + offset);
+}
+
+static int bcm2835_gpio_get(struct gpio_chip *chip, unsigned offset)
+{
+ struct bcm2835_pinctrl *pc = dev_get_drvdata(chip->dev);
+
+ return bcm2835_gpio_get_bit(pc, GPLEV0, offset);
+}
+
+static int bcm2835_gpio_direction_output(struct gpio_chip *chip,
+ unsigned offset, int value)
+{
+ return pinctrl_gpio_direction_output(chip->base + offset);
+}
+
+static void bcm2835_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
+{
+ struct bcm2835_pinctrl *pc = dev_get_drvdata(chip->dev);
+
+ bcm2835_gpio_set_bit(pc, value ? GPSET0 : GPCLR0, offset);
+}
+
+static int bcm2835_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
+{
+ struct bcm2835_pinctrl *pc = dev_get_drvdata(chip->dev);
+
+ return irq_linear_revmap(pc->irq_domain, offset);
+}
+
+static struct gpio_chip bcm2835_gpio_chip __devinitconst = {
+ .label = MODULE_NAME,
+ .owner = THIS_MODULE,
+ .request = bcm2835_gpio_request,
+ .free = bcm2835_gpio_free,
+ .direction_input = bcm2835_gpio_direction_input,
+ .direction_output = bcm2835_gpio_direction_output,
+ .get = bcm2835_gpio_get,
+ .set = bcm2835_gpio_set,
+ .to_irq = bcm2835_gpio_to_irq,
+ .base = -1,
+ .ngpio = BCM2835_NUM_GPIOS,
+ .can_sleep = 0,
+};
+
+static irqreturn_t bcm2835_gpio_irq_handler(int irq, void *dev_id)
+{
+ struct bcm2835_gpio_irqdata *irqdata = dev_id;
+ struct bcm2835_pinctrl *pc = irqdata->pc;
+ int bank = irqdata->bank;
+ unsigned long events;
+ unsigned offset;
+ unsigned gpio;
+ unsigned int type;
+
+ events = bcm2835_gpio_rd(pc, GPEDS0 + bank * 4);
+ events &= pc->enabled_irq_map[bank];
+ for_each_set_bit(offset, &events, 32) {
+ gpio = (32 * bank) + offset;
+ type = pc->irq_type[gpio];
+
+ /* ack edge triggered IRQs immediately */
+ if (!(type & IRQ_TYPE_LEVEL_MASK))
+ bcm2835_gpio_set_bit(pc, GPEDS0, gpio);
+
+ generic_handle_irq(irq_linear_revmap(pc->irq_domain, gpio));
+
+ /* ack level triggered IRQ after handling them */
+ if (type & IRQ_TYPE_LEVEL_MASK)
+ bcm2835_gpio_set_bit(pc, GPEDS0, gpio);
+ }
+ return events ? IRQ_HANDLED : IRQ_NONE;
+}
+
+static inline void __bcm2835_gpio_irq_config(struct bcm2835_pinctrl *pc,
+ unsigned reg, unsigned offset, bool enable)
+{
+ u32 value;
+ reg += GPIO_REG_OFFSET(offset) * 4;
+ value = bcm2835_gpio_rd(pc, reg);
+ if (enable)
+ value |= BIT(GPIO_REG_SHIFT(offset));
+ else
+ value &= ~(BIT(GPIO_REG_SHIFT(offset)));
+ bcm2835_gpio_wr(pc, reg, value);
+}
+
+/* fast path for IRQ handler */
+static void bcm2835_gpio_irq_config(struct bcm2835_pinctrl *pc,
+ unsigned offset, bool enable)
+{
+ switch (pc->irq_type[offset]) {
+ case IRQ_TYPE_EDGE_RISING:
+ __bcm2835_gpio_irq_config(pc, GPREN0, offset, enable);
+ break;
+
+ case IRQ_TYPE_EDGE_FALLING:
+ __bcm2835_gpio_irq_config(pc, GPFEN0, offset, enable);
+ break;
+
+ case IRQ_TYPE_EDGE_BOTH:
+ __bcm2835_gpio_irq_config(pc, GPREN0, offset, enable);
+ __bcm2835_gpio_irq_config(pc, GPFEN0, offset, enable);
+ break;
+
+ case IRQ_TYPE_LEVEL_HIGH:
+ __bcm2835_gpio_irq_config(pc, GPHEN0, offset, enable);
+ break;
+
+ case IRQ_TYPE_LEVEL_LOW:
+ __bcm2835_gpio_irq_config(pc, GPLEN0, offset, enable);
+ break;
+ }
+}
+
+static void bcm2835_gpio_irq_enable(struct irq_data *data)
+{
+ struct bcm2835_pinctrl *pc = irq_data_get_irq_chip_data(data);
+ unsigned gpio = irqd_to_hwirq(data);
+ unsigned offset = GPIO_REG_SHIFT(gpio);
+ unsigned bank = GPIO_REG_OFFSET(gpio);
+ unsigned long flags;
+
+ spin_lock_irqsave(&pc->irq_lock[bank], flags);
+ set_bit(offset, &pc->enabled_irq_map[bank]);
+ bcm2835_gpio_irq_config(pc, gpio, true);
+ spin_unlock_irqrestore(&pc->irq_lock[bank], flags);
+}
+
+static void bcm2835_gpio_irq_disable(struct irq_data *data)
+{
+ struct bcm2835_pinctrl *pc = irq_data_get_irq_chip_data(data);
+ unsigned gpio = irqd_to_hwirq(data);
+ unsigned offset = GPIO_REG_SHIFT(gpio);
+ unsigned bank = GPIO_REG_OFFSET(gpio);
+ unsigned long flags;
+
+ spin_lock_irqsave(&pc->irq_lock[bank], flags);
+ bcm2835_gpio_irq_config(pc, gpio, false);
+ clear_bit(offset, &pc->enabled_irq_map[bank]);
+ spin_unlock_irqrestore(&pc->irq_lock[bank], flags);
+}
+
+static int __bcm2835_gpio_irq_set_type_disabled(struct bcm2835_pinctrl *pc,
+ unsigned offset, unsigned int type)
+{
+ switch (type) {
+ case IRQ_TYPE_NONE:
+ case IRQ_TYPE_EDGE_RISING:
+ case IRQ_TYPE_EDGE_FALLING:
+ case IRQ_TYPE_EDGE_BOTH:
+ case IRQ_TYPE_LEVEL_HIGH:
+ case IRQ_TYPE_LEVEL_LOW:
+ pc->irq_type[offset] = type;
+ break;
+
+ default:
+ return -EINVAL;
+ }
+ return 0;
+}
+
+/* slower path for reconfiguring IRQ type */
+static int __bcm2835_gpio_irq_set_type_enabled(struct bcm2835_pinctrl *pc,
+ unsigned offset, unsigned int type)
+{
+ switch (type) {
+ case IRQ_TYPE_NONE:
+ if (pc->irq_type[offset] != type) {
+ bcm2835_gpio_irq_config(pc, offset, false);
+ pc->irq_type[offset] = type;
+ }
+ break;
+
+ case IRQ_TYPE_EDGE_RISING:
+ if (pc->irq_type[offset] == IRQ_TYPE_EDGE_BOTH) {
+ /* RISING already enabled, disable FALLING */
+ pc->irq_type[offset] = IRQ_TYPE_EDGE_FALLING;
+ bcm2835_gpio_irq_config(pc, offset, false);
+ pc->irq_type[offset] = type;
+ } else if (pc->irq_type[offset] != type) {
+ bcm2835_gpio_irq_config(pc, offset, false);
+ pc->irq_type[offset] = type;
+ bcm2835_gpio_irq_config(pc, offset, true);
+ }
+ break;
+
+ case IRQ_TYPE_EDGE_FALLING:
+ if (pc->irq_type[offset] == IRQ_TYPE_EDGE_BOTH) {
+ /* FALLING already enabled, disable RISING */
+ pc->irq_type[offset] = IRQ_TYPE_EDGE_RISING;
+ bcm2835_gpio_irq_config(pc, offset, false);
+ pc->irq_type[offset] = type;
+ } else if (pc->irq_type[offset] != type) {
+ bcm2835_gpio_irq_config(pc, offset, false);
+ pc->irq_type[offset] = type;
+ bcm2835_gpio_irq_config(pc, offset, true);
+ }
+ break;
+
+ case IRQ_TYPE_EDGE_BOTH:
+ if (pc->irq_type[offset] == IRQ_TYPE_EDGE_RISING) {
+ /* RISING already enabled, enable FALLING too */
+ pc->irq_type[offset] = IRQ_TYPE_EDGE_FALLING;
+ bcm2835_gpio_irq_config(pc, offset, true);
+ pc->irq_type[offset] = type;
+ } else if (pc->irq_type[offset] == IRQ_TYPE_EDGE_FALLING) {
+ /* FALLING already enabled, enable RISING too */
+ pc->irq_type[offset] = IRQ_TYPE_EDGE_RISING;
+ bcm2835_gpio_irq_config(pc, offset, true);
+ pc->irq_type[offset] = type;
+ } else if (pc->irq_type[offset] != type) {
+ bcm2835_gpio_irq_config(pc, offset, false);
+ pc->irq_type[offset] = type;
+ bcm2835_gpio_irq_config(pc, offset, true);
+ }
+ break;
+
+ case IRQ_TYPE_LEVEL_HIGH:
+ case IRQ_TYPE_LEVEL_LOW:
+ if (pc->irq_type[offset] != type) {
+ bcm2835_gpio_irq_config(pc, offset, false);
+ pc->irq_type[offset] = type;
+ bcm2835_gpio_irq_config(pc, offset, true);
+ }
+ break;
+
+ default:
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static int bcm2835_gpio_irq_set_type(struct irq_data *data, unsigned int type)
+{
+ struct bcm2835_pinctrl *pc = irq_data_get_irq_chip_data(data);
+ unsigned gpio = irqd_to_hwirq(data);
+ unsigned offset = GPIO_REG_SHIFT(gpio);
+ unsigned bank = GPIO_REG_OFFSET(gpio);
+ unsigned long flags;
+ int ret;
+
+ spin_lock_irqsave(&pc->irq_lock[bank], flags);
+
+ if (test_bit(offset, &pc->enabled_irq_map[bank]))
+ ret = __bcm2835_gpio_irq_set_type_enabled(pc, gpio, type);
+ else
+ ret = __bcm2835_gpio_irq_set_type_disabled(pc, gpio, type);
+
+ spin_unlock_irqrestore(&pc->irq_lock[bank], flags);
+
+ return ret;
+}
+
+static struct irq_chip bcm2835_gpio_irq_chip = {
+ .name = MODULE_NAME,
+ .irq_enable = bcm2835_gpio_irq_enable,
+ .irq_disable = bcm2835_gpio_irq_disable,
+ .irq_set_type = bcm2835_gpio_irq_set_type,
+};
+
+static int bcm2835_pctl_get_groups_count(struct pinctrl_dev *pctldev)
+{
+ return ARRAY_SIZE(bcm2835_gpio_groups);
+}
+
+static const char *bcm2835_pctl_get_group_name(struct pinctrl_dev *pctldev,
+ unsigned selector)
+{
+ return bcm2835_gpio_groups[selector];
+}
+
+static int bcm2835_pctl_get_group_pins(struct pinctrl_dev *pctldev,
+ unsigned selector,
+ const unsigned **pins,
+ unsigned *num_pins)
+{
+ *pins = &bcm2835_gpio_pins[selector].number;
+ *num_pins = 1;
+
+ return 0;
+}
+
+static void bcm2835_pctl_pin_dbg_show(struct pinctrl_dev *pctldev,
+ struct seq_file *s,
+ unsigned offset)
+{
+ struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
+ enum bcm2835_fsel fsel = bcm2835_pinctrl_fsel_get(pc, offset);
+ const char *fname = bcm2835_functions[fsel];
+ int value = bcm2835_gpio_get_bit(pc, GPLEV0, offset);
+ int irq = irq_find_mapping(pc->irq_domain, offset);
+
+ seq_printf(s, "function %s in %s; irq %d (%s)",
+ fname, value ? "hi" : "lo",
+ irq, irq_type_names[pc->irq_type[offset]]);
+}
+
+static void bcm2835_pctl_dt_free_map(struct pinctrl_dev *pctldev,
+ struct pinctrl_map *maps, unsigned num_maps)
+{
+ int i;
+
+ for (i = 0; i < num_maps; i++)
+ if (maps[i].type == PIN_MAP_TYPE_CONFIGS_PIN)
+ kfree(maps[i].data.configs.configs);
+
+ kfree(maps);
+}
+
+static int bcm2835_pctl_dt_node_to_map_func(struct bcm2835_pinctrl *pc,
+ struct device_node *np, u32 pin, u32 fnum,
+ struct pinctrl_map **maps)
+{
+ struct pinctrl_map *map = *maps;
+
+ if (fnum >= ARRAY_SIZE(bcm2835_functions)) {
+ dev_err(pc->dev, "%s: invalid brcm,function %d\n",
+ of_node_full_name(np), fnum);
+ return -EINVAL;
+ }
+
+ map->type = PIN_MAP_TYPE_MUX_GROUP;
+ map->data.mux.group = bcm2835_gpio_groups[pin];
+ map->data.mux.function = bcm2835_functions[fnum];
+ (*maps)++;
+
+ return 0;
+}
+
+static int bcm2835_pctl_dt_node_to_map_pull(struct bcm2835_pinctrl *pc,
+ struct device_node *np, u32 pin, u32 pull,
+ struct pinctrl_map **maps)
+{
+ struct pinctrl_map *map = *maps;
+ unsigned long *configs;
+
+ if (pull > 2) {
+ dev_err(pc->dev, "%s: invalid brcm,pull %d\n",
+ of_node_full_name(np), pull);
+ return -EINVAL;
+ }
+
+ configs = kzalloc(sizeof(*configs), GFP_KERNEL);
+ if (!configs)
+ return -ENOMEM;
+ configs[0] = BCM2835_PINCONF_PACK(BCM2835_PINCONF_PARAM_PULL, pull);
+
+ map->type = PIN_MAP_TYPE_CONFIGS_PIN;
+ map->data.configs.group_or_pin = bcm2835_gpio_pins[pin].name;
+ map->data.configs.configs = configs;
+ map->data.configs.num_configs = 1;
+ (*maps)++;
+
+ return 0;
+}
+
+static inline u32 prop_u32(struct property *p, int i)
+{
+ return be32_to_cpup(((__be32 *)p->value) + i);
+}
+
+static int bcm2835_pctl_dt_node_to_map(struct pinctrl_dev *pctldev,
+ struct device_node *np,
+ struct pinctrl_map **map, unsigned *num_maps)
+{
+ struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
+ struct property *pins, *funcs, *pulls;
+ int num_pins, num_funcs, num_pulls, maps_per_pin;
+ struct pinctrl_map *maps, *cur_map;
+ int i, err;
+ u32 pin, func, pull;
+
+ pins = of_find_property(np, "brcm,pins", NULL);
+ if (!pins) {
+ dev_err(pc->dev, "%s: missing brcm,pins property\n",
+ of_node_full_name(np));
+ return -EINVAL;
+ }
+
+ funcs = of_find_property(np, "brcm,function", NULL);
+ pulls = of_find_property(np, "brcm,pull", NULL);
+
+ if (!funcs && !pulls) {
+ dev_err(pc->dev,
+ "%s: neither brcm,function nor brcm,pull specified\n",
+ of_node_full_name(np));
+ return -EINVAL;
+ }
+
+ num_pins = pins->length / 4;
+ num_funcs = funcs ? (funcs->length / 4) : 0;
+ num_pulls = pulls ? (pulls->length / 4) : 0;
+
+ if (num_funcs > 1 && num_funcs != num_pins) {
+ dev_err(pc->dev,
+ "%s: brcm,function must have 1 or %d entries\n",
+ of_node_full_name(np), num_pins);
+ return -EINVAL;
+ }
+
+ if (num_pulls > 1 && num_pulls != num_pins) {
+ dev_err(pc->dev,
+ "%s: brcm,pull must have 1 or %d entries\n",
+ of_node_full_name(np), num_pins);
+ return -EINVAL;
+ }
+
+ maps_per_pin = 0;
+ if (num_funcs)
+ maps_per_pin++;
+ if (num_pulls)
+ maps_per_pin++;
+ cur_map = maps = kzalloc(num_pins * maps_per_pin * sizeof(*maps),
+ GFP_KERNEL);
+ if (!maps)
+ return -ENOMEM;
+
+ for (i = 0; i < num_pins; i++) {
+ pin = prop_u32(pins, i);
+ if (pin >= ARRAY_SIZE(bcm2835_gpio_pins)) {
+ dev_err(pc->dev, "%s: invalid brcm,pins value %d\n",
+ of_node_full_name(np), pin);
+ err = -EINVAL;
+ goto out;
+ }
+
+ if (num_funcs) {
+ func = prop_u32(funcs, (num_funcs > 1) ? i : 0);
+ err = bcm2835_pctl_dt_node_to_map_func(pc, np, pin,
+ func, &cur_map);
+ if (err)
+ goto out;
+ }
+ if (num_pulls) {
+ pull = prop_u32(pulls, (num_pulls > 1) ? i : 0);
+ err = bcm2835_pctl_dt_node_to_map_pull(pc, np, pin,
+ pull, &cur_map);
+ if (err)
+ goto out;
+ }
+ }
+
+ *map = maps;
+ *num_maps = num_pins * maps_per_pin;
+
+ return 0;
+
+out:
+ kfree(maps);
+ return err;
+}
+
+static struct pinctrl_ops bcm2835_pctl_ops = {
+ .get_groups_count = bcm2835_pctl_get_groups_count,
+ .get_group_name = bcm2835_pctl_get_group_name,
+ .get_group_pins = bcm2835_pctl_get_group_pins,
+ .pin_dbg_show = bcm2835_pctl_pin_dbg_show,
+ .dt_node_to_map = bcm2835_pctl_dt_node_to_map,
+ .dt_free_map = bcm2835_pctl_dt_free_map,
+};
+
+static int bcm2835_pmx_get_functions_count(struct pinctrl_dev *pctldev)
+{
+ return BCM2835_FSEL_COUNT;
+}
+
+static const char *bcm2835_pmx_get_function_name(struct pinctrl_dev *pctldev,
+ unsigned selector)
+{
+ return bcm2835_functions[selector];
+}
+
+static int bcm2835_pmx_get_function_groups(struct pinctrl_dev *pctldev,
+ unsigned selector,
+ const char * const **groups,
+ unsigned * const num_groups)
+{
+ /* every pin can do every function */
+ *groups = bcm2835_gpio_groups;
+ *num_groups = ARRAY_SIZE(bcm2835_gpio_groups);
+
+ return 0;
+}
+
+static int bcm2835_pmx_enable(struct pinctrl_dev *pctldev,
+ unsigned func_selector,
+ unsigned group_selector)
+{
+ struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
+
+ bcm2835_pinctrl_fsel_set(pc, group_selector, func_selector);
+
+ return 0;
+}
+
+static void bcm2835_pmx_disable(struct pinctrl_dev *pctldev,
+ unsigned func_selector,
+ unsigned group_selector)
+{
+ struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
+
+ /* disable by setting to GPIO_IN */
+ bcm2835_pinctrl_fsel_set(pc, group_selector, BCM2835_FSEL_GPIO_IN);
+}
+
+static void bcm2835_pmx_gpio_disable_free(struct pinctrl_dev *pctldev,
+ struct pinctrl_gpio_range *range,
+ unsigned offset)
+{
+ struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
+
+ /* disable by setting to GPIO_IN */
+ bcm2835_pinctrl_fsel_set(pc, offset, BCM2835_FSEL_GPIO_IN);
+}
+
+static int bcm2835_pmx_gpio_set_direction(struct pinctrl_dev *pctldev,
+ struct pinctrl_gpio_range *range,
+ unsigned offset,
+ bool input)
+{
+ struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
+ enum bcm2835_fsel fsel = input ?
+ BCM2835_FSEL_GPIO_IN : BCM2835_FSEL_GPIO_OUT;
+
+ bcm2835_pinctrl_fsel_set(pc, offset, fsel);
+
+ return 0;
+}
+
+static struct pinmux_ops bcm2835_pmx_ops = {
+ .get_functions_count = bcm2835_pmx_get_functions_count,
+ .get_function_name = bcm2835_pmx_get_function_name,
+ .get_function_groups = bcm2835_pmx_get_function_groups,
+ .enable = bcm2835_pmx_enable,
+ .disable = bcm2835_pmx_disable,
+ .gpio_disable_free = bcm2835_pmx_gpio_disable_free,
+ .gpio_set_direction = bcm2835_pmx_gpio_set_direction,
+};
+
+static int bcm2835_pinconf_get(struct pinctrl_dev *pctldev,
+ unsigned pin, unsigned long *config)
+{
+ /* No way to read back config in HW */
+ return -ENOTSUPP;
+}
+
+static int bcm2835_pinconf_set(struct pinctrl_dev *pctldev,
+ unsigned pin, unsigned long config)
+{
+ struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
+ enum bcm2835_pinconf_param param = BCM2835_PINCONF_UNPACK_PARAM(config);
+ u16 arg = BCM2835_PINCONF_UNPACK_ARG(config);
+ u32 off, bit;
+
+ if (param != BCM2835_PINCONF_PARAM_PULL)
+ return -EINVAL;
+
+ off = GPIO_REG_OFFSET(pin);
+ bit = GPIO_REG_SHIFT(pin);
+
+ bcm2835_gpio_wr(pc, GPPUD, arg & 3);
+ /*
+ * Docs say to wait 150 cycles, but not of what. We assume a
+ * 1 MHz clock here, which is pretty slow...
+ */
+ udelay(150);
+ bcm2835_gpio_wr(pc, GPPUDCLK0 + (off * 4), BIT(bit));
+ udelay(150);
+ bcm2835_gpio_wr(pc, GPPUDCLK0 + (off * 4), 0);
+
+ return 0;
+}
+
+struct pinconf_ops bcm2835_pinconf_ops = {
+ .pin_config_get = bcm2835_pinconf_get,
+ .pin_config_set = bcm2835_pinconf_set,
+};
+
+static struct pinctrl_desc bcm2835_pinctrl_desc = {
+ .name = MODULE_NAME,
+ .pins = bcm2835_gpio_pins,
+ .npins = ARRAY_SIZE(bcm2835_gpio_pins),
+ .pctlops = &bcm2835_pctl_ops,
+ .pmxops = &bcm2835_pmx_ops,
+ .confops = &bcm2835_pinconf_ops,
+ .owner = THIS_MODULE,
+};
+
+static struct pinctrl_gpio_range bcm2835_pinctrl_gpio_range __devinitconst = {
+ .name = MODULE_NAME,
+ .npins = BCM2835_NUM_GPIOS,
+};
+
+static int __devinit bcm2835_pinctrl_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct device_node *np = dev->of_node;
+ struct bcm2835_pinctrl *pc;
+ struct resource iomem;
+ int err, i;
+ BUILD_BUG_ON(ARRAY_SIZE(bcm2835_gpio_pins) != BCM2835_NUM_GPIOS);
+ BUILD_BUG_ON(ARRAY_SIZE(bcm2835_gpio_groups) != BCM2835_NUM_GPIOS);
+
+ pc = devm_kzalloc(dev, sizeof(*pc), GFP_KERNEL);
+ if (!pc)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, pc);
+ pc->dev = dev;
+
+ err = of_address_to_resource(np, 0, &iomem);
+ if (err) {
+ dev_err(dev, "could not get IO memory\n");
+ return err;
+ }
+
+ pc->base = devm_request_and_ioremap(&pdev->dev, &iomem);
+ if (!pc->base)
+ return -EADDRNOTAVAIL;
+
+ pc->gpio_chip = bcm2835_gpio_chip;
+ pc->gpio_chip.dev = dev;
+ pc->gpio_chip.of_node = np;
+
+ pc->irq_domain = irq_domain_add_linear(np, BCM2835_NUM_GPIOS,
+ &irq_domain_simple_ops, NULL);
+ if (!pc->irq_domain) {
+ dev_err(dev, "could not create IRQ domain\n");
+ return -ENOMEM;
+ }
+
+ for (i = 0; i < BCM2835_NUM_GPIOS; i++) {
+ int irq = irq_create_mapping(pc->irq_domain, i);
+ irq_set_lockdep_class(irq, &gpio_lock_class);
+ irq_set_chip_and_handler(irq, &bcm2835_gpio_irq_chip,
+ handle_simple_irq);
+ irq_set_chip_data(irq, pc);
+ set_irq_flags(irq, IRQF_VALID);
+ }
+
+ for (i = 0; i < BCM2835_NUM_BANKS; i++) {
+ unsigned long events;
+ unsigned offset;
+ int len;
+ char *name;
+
+ /* clear event detection flags */
+ bcm2835_gpio_wr(pc, GPREN0 + i * 4, 0);
+ bcm2835_gpio_wr(pc, GPFEN0 + i * 4, 0);
+ bcm2835_gpio_wr(pc, GPHEN0 + i * 4, 0);
+ bcm2835_gpio_wr(pc, GPLEN0 + i * 4, 0);
+ bcm2835_gpio_wr(pc, GPAREN0 + i * 4, 0);
+ bcm2835_gpio_wr(pc, GPAFEN0 + i * 4, 0);
+
+ /* clear all the events */
+ events = bcm2835_gpio_rd(pc, GPEDS0 + i * 4);
+ for_each_set_bit(offset, &events, 32)
+ bcm2835_gpio_wr(pc, GPEDS0 + i * 4, BIT(offset));
+
+ pc->irq[i] = irq_of_parse_and_map(np, i);
+ pc->irq_data[i].pc = pc;
+ pc->irq_data[i].bank = i;
+ spin_lock_init(&pc->irq_lock[i]);
+
+ len = strlen(dev_name(pc->dev)) + 16;
+ name = devm_kzalloc(pc->dev, len, GFP_KERNEL);
+ if (!name)
+ return -ENOMEM;
+ snprintf(name, len, "%s:bank%d", dev_name(pc->dev), i);
+
+ err = devm_request_irq(dev, pc->irq[i],
+ bcm2835_gpio_irq_handler, IRQF_SHARED,
+ name, &pc->irq_data[i]);
+ if (err) {
+ dev_err(dev, "unable to request IRQ %d\n", pc->irq[i]);
+ return err;
+ }
+ }
+
+ err = gpiochip_add(&pc->gpio_chip);
+ if (err) {
+ dev_err(dev, "could not add GPIO chip\n");
+ return err;
+ }
+
+ pc->pctl_dev = pinctrl_register(&bcm2835_pinctrl_desc, dev, pc);
+ if (!pc->pctl_dev) {
+ gpiochip_remove(&pc->gpio_chip);
+ return PTR_ERR(pc->pctl_dev);
+ }
+
+ pc->gpio_range = bcm2835_pinctrl_gpio_range;
+ pc->gpio_range.base = pc->gpio_chip.base;
+ pc->gpio_range.gc = &pc->gpio_chip;
+ pinctrl_add_gpio_range(pc->pctl_dev, &pc->gpio_range);
+
+ return 0;
+}
+
+static int __devexit bcm2835_pinctrl_remove(struct platform_device *pdev)
+{
+ struct bcm2835_pinctrl *pc = platform_get_drvdata(pdev);
+
+ pinctrl_unregister(pc->pctl_dev);
+ gpiochip_remove(&pc->gpio_chip);
+
+ return 0;
+}
+
+static struct of_device_id bcm2835_pinctrl_match[] __devinitconst = {
+ { .compatible = "brcm,bcm2835-gpio" },
+ {}
+};
+MODULE_DEVICE_TABLE(of, bcm2835_pinctrl_match);
+
+static struct platform_driver bcm2835_pinctrl_driver = {
+ .probe = bcm2835_pinctrl_probe,
+ .remove = bcm2835_pinctrl_remove,
+ .driver = {
+ .name = MODULE_NAME,
+ .owner = THIS_MODULE,
+ .of_match_table = bcm2835_pinctrl_match,
+ },
+};
+module_platform_driver(bcm2835_pinctrl_driver);
+
+MODULE_AUTHOR("Chris Boot, Simon Arlott, Stephen Warren");
+MODULE_DESCRIPTION("BCM2835 Pin control driver");
+MODULE_LICENSE("GPL");