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path: root/drivers/pinctrl/bcm/pinctrl-bcm2835.c
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Diffstat (limited to 'drivers/pinctrl/bcm/pinctrl-bcm2835.c')
-rw-r--r--drivers/pinctrl/bcm/pinctrl-bcm2835.c1385
1 files changed, 1385 insertions, 0 deletions
diff --git a/drivers/pinctrl/bcm/pinctrl-bcm2835.c b/drivers/pinctrl/bcm/pinctrl-bcm2835.c
new file mode 100644
index 000000000..fe8da3ccb
--- /dev/null
+++ b/drivers/pinctrl/bcm/pinctrl-bcm2835.c
@@ -0,0 +1,1385 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * 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
+ */
+
+#include <linux/bitmap.h>
+#include <linux/bug.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/gpio/driver.h>
+#include <linux/io.h>
+#include <linux/irq.h>
+#include <linux/irqdesc.h>
+#include <linux/init.h>
+#include <linux/interrupt.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/pinctrl/pinconf-generic.h>
+#include <linux/platform_device.h>
+#include <linux/seq_file.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/types.h>
+#include <dt-bindings/pinctrl/bcm2835.h>
+
+#define MODULE_NAME "pinctrl-bcm2835"
+#define BCM2835_NUM_GPIOS 54
+#define BCM2711_NUM_GPIOS 58
+#define BCM2835_NUM_BANKS 2
+#define BCM2835_NUM_IRQS 3
+
+/* 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 GP_GPIO_PUP_PDN_CNTRL_REG0 0xe4 /* 2711 Pin Pull-up/down select */
+
+#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)
+
+#define PUD_2711_MASK 0x3
+#define PUD_2711_REG_OFFSET(p) ((p) / 16)
+#define PUD_2711_REG_SHIFT(p) (((p) % 16) * 2)
+
+/* argument: bcm2835_pinconf_pull */
+#define BCM2835_PINCONF_PARAM_PULL (PIN_CONFIG_END + 1)
+
+#define BCM2711_PULL_NONE 0x0
+#define BCM2711_PULL_UP 0x1
+#define BCM2711_PULL_DOWN 0x2
+
+struct bcm2835_pinctrl {
+ struct device *dev;
+ void __iomem *base;
+ int *wake_irq;
+
+ /* note: locking assumes each bank will have its own unsigned long */
+ unsigned long enabled_irq_map[BCM2835_NUM_BANKS];
+ unsigned int irq_type[BCM2711_NUM_GPIOS];
+
+ struct pinctrl_dev *pctl_dev;
+ struct gpio_chip gpio_chip;
+ struct pinctrl_desc pctl_desc;
+ struct pinctrl_gpio_range gpio_range;
+
+ raw_spinlock_t irq_lock[BCM2835_NUM_BANKS];
+ /* Protect FSEL registers */
+ spinlock_t fsel_lock;
+};
+
+/* pins are just named GPIO0..GPIO53 */
+#define BCM2835_GPIO_PIN(a) PINCTRL_PIN(a, "gpio" #a)
+static 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),
+ BCM2835_GPIO_PIN(54),
+ BCM2835_GPIO_PIN(55),
+ BCM2835_GPIO_PIN(56),
+ BCM2835_GPIO_PIN(57),
+};
+
+/* 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",
+ "gpio54",
+ "gpio55",
+ "gpio56",
+ "gpio57",
+};
+
+enum bcm2835_fsel {
+ 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;
+ enum bcm2835_fsel cur;
+ unsigned long flags;
+
+ spin_lock_irqsave(&pc->fsel_lock, flags);
+ val = bcm2835_gpio_rd(pc, FSEL_REG(pin));
+ 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)
+ goto unlock;
+
+ 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);
+
+unlock:
+ spin_unlock_irqrestore(&pc->fsel_lock, flags);
+}
+
+static int bcm2835_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
+{
+ struct bcm2835_pinctrl *pc = gpiochip_get_data(chip);
+
+ bcm2835_pinctrl_fsel_set(pc, offset, BCM2835_FSEL_GPIO_IN);
+ return 0;
+}
+
+static int bcm2835_gpio_get(struct gpio_chip *chip, unsigned offset)
+{
+ struct bcm2835_pinctrl *pc = gpiochip_get_data(chip);
+
+ return bcm2835_gpio_get_bit(pc, GPLEV0, offset);
+}
+
+static int bcm2835_gpio_get_direction(struct gpio_chip *chip, unsigned int offset)
+{
+ struct bcm2835_pinctrl *pc = gpiochip_get_data(chip);
+ enum bcm2835_fsel fsel = bcm2835_pinctrl_fsel_get(pc, offset);
+
+ /* Alternative function doesn't clearly provide a direction */
+ if (fsel > BCM2835_FSEL_GPIO_OUT)
+ return -EINVAL;
+
+ if (fsel == BCM2835_FSEL_GPIO_IN)
+ return GPIO_LINE_DIRECTION_IN;
+
+ return GPIO_LINE_DIRECTION_OUT;
+}
+
+static void bcm2835_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
+{
+ struct bcm2835_pinctrl *pc = gpiochip_get_data(chip);
+
+ bcm2835_gpio_set_bit(pc, value ? GPSET0 : GPCLR0, offset);
+}
+
+static int bcm2835_gpio_direction_output(struct gpio_chip *chip,
+ unsigned offset, int value)
+{
+ struct bcm2835_pinctrl *pc = gpiochip_get_data(chip);
+
+ bcm2835_gpio_set_bit(pc, value ? GPSET0 : GPCLR0, offset);
+ bcm2835_pinctrl_fsel_set(pc, offset, BCM2835_FSEL_GPIO_OUT);
+ return 0;
+}
+
+static int bcm2835_of_gpio_ranges_fallback(struct gpio_chip *gc,
+ struct device_node *np)
+{
+ struct pinctrl_dev *pctldev = of_pinctrl_get(np);
+
+ if (!pctldev)
+ return 0;
+
+ return gpiochip_add_pin_range(gc, pinctrl_dev_get_devname(pctldev), 0, 0,
+ gc->ngpio);
+}
+
+static const struct gpio_chip bcm2835_gpio_chip = {
+ .label = MODULE_NAME,
+ .owner = THIS_MODULE,
+ .request = gpiochip_generic_request,
+ .free = gpiochip_generic_free,
+ .direction_input = bcm2835_gpio_direction_input,
+ .direction_output = bcm2835_gpio_direction_output,
+ .get_direction = bcm2835_gpio_get_direction,
+ .get = bcm2835_gpio_get,
+ .set = bcm2835_gpio_set,
+ .set_config = gpiochip_generic_config,
+ .base = -1,
+ .ngpio = BCM2835_NUM_GPIOS,
+ .can_sleep = false,
+ .of_gpio_ranges_fallback = bcm2835_of_gpio_ranges_fallback,
+};
+
+static const struct gpio_chip bcm2711_gpio_chip = {
+ .label = "pinctrl-bcm2711",
+ .owner = THIS_MODULE,
+ .request = gpiochip_generic_request,
+ .free = gpiochip_generic_free,
+ .direction_input = bcm2835_gpio_direction_input,
+ .direction_output = bcm2835_gpio_direction_output,
+ .get_direction = bcm2835_gpio_get_direction,
+ .get = bcm2835_gpio_get,
+ .set = bcm2835_gpio_set,
+ .set_config = gpiochip_generic_config,
+ .base = -1,
+ .ngpio = BCM2711_NUM_GPIOS,
+ .can_sleep = false,
+ .of_gpio_ranges_fallback = bcm2835_of_gpio_ranges_fallback,
+};
+
+static void bcm2835_gpio_irq_handle_bank(struct bcm2835_pinctrl *pc,
+ unsigned int bank, u32 mask)
+{
+ unsigned long events;
+ unsigned offset;
+ unsigned gpio;
+
+ events = bcm2835_gpio_rd(pc, GPEDS0 + bank * 4);
+ events &= mask;
+ events &= pc->enabled_irq_map[bank];
+ for_each_set_bit(offset, &events, 32) {
+ gpio = (32 * bank) + offset;
+ generic_handle_domain_irq(pc->gpio_chip.irq.domain,
+ gpio);
+ }
+}
+
+static void bcm2835_gpio_irq_handler(struct irq_desc *desc)
+{
+ struct gpio_chip *chip = irq_desc_get_handler_data(desc);
+ struct bcm2835_pinctrl *pc = gpiochip_get_data(chip);
+ struct irq_chip *host_chip = irq_desc_get_chip(desc);
+ int irq = irq_desc_get_irq(desc);
+ int group = 0;
+ int i;
+
+ for (i = 0; i < BCM2835_NUM_IRQS; i++) {
+ if (chip->irq.parents[i] == irq) {
+ group = i;
+ break;
+ }
+ }
+ /* This should not happen, every IRQ has a bank */
+ BUG_ON(i == BCM2835_NUM_IRQS);
+
+ chained_irq_enter(host_chip, desc);
+
+ switch (group) {
+ case 0: /* IRQ0 covers GPIOs 0-27 */
+ bcm2835_gpio_irq_handle_bank(pc, 0, 0x0fffffff);
+ break;
+ case 1: /* IRQ1 covers GPIOs 28-45 */
+ bcm2835_gpio_irq_handle_bank(pc, 0, 0xf0000000);
+ bcm2835_gpio_irq_handle_bank(pc, 1, 0x00003fff);
+ break;
+ case 2: /* IRQ2 covers GPIOs 46-57 */
+ bcm2835_gpio_irq_handle_bank(pc, 1, 0x003fc000);
+ break;
+ }
+
+ chained_irq_exit(host_chip, desc);
+}
+
+static irqreturn_t bcm2835_gpio_wake_irq_handler(int irq, void *dev_id)
+{
+ return IRQ_HANDLED;
+}
+
+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_unmask(struct irq_data *data)
+{
+ struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
+ struct bcm2835_pinctrl *pc = gpiochip_get_data(chip);
+ unsigned gpio = irqd_to_hwirq(data);
+ unsigned offset = GPIO_REG_SHIFT(gpio);
+ unsigned bank = GPIO_REG_OFFSET(gpio);
+ unsigned long flags;
+
+ gpiochip_enable_irq(chip, gpio);
+
+ raw_spin_lock_irqsave(&pc->irq_lock[bank], flags);
+ set_bit(offset, &pc->enabled_irq_map[bank]);
+ bcm2835_gpio_irq_config(pc, gpio, true);
+ raw_spin_unlock_irqrestore(&pc->irq_lock[bank], flags);
+}
+
+static void bcm2835_gpio_irq_mask(struct irq_data *data)
+{
+ struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
+ struct bcm2835_pinctrl *pc = gpiochip_get_data(chip);
+ unsigned gpio = irqd_to_hwirq(data);
+ unsigned offset = GPIO_REG_SHIFT(gpio);
+ unsigned bank = GPIO_REG_OFFSET(gpio);
+ unsigned long flags;
+
+ raw_spin_lock_irqsave(&pc->irq_lock[bank], flags);
+ bcm2835_gpio_irq_config(pc, gpio, false);
+ /* Clear events that were latched prior to clearing event sources */
+ bcm2835_gpio_set_bit(pc, GPEDS0, gpio);
+ clear_bit(offset, &pc->enabled_irq_map[bank]);
+ raw_spin_unlock_irqrestore(&pc->irq_lock[bank], flags);
+
+ gpiochip_disable_irq(chip, gpio);
+}
+
+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 gpio_chip *chip = irq_data_get_irq_chip_data(data);
+ struct bcm2835_pinctrl *pc = gpiochip_get_data(chip);
+ unsigned gpio = irqd_to_hwirq(data);
+ unsigned offset = GPIO_REG_SHIFT(gpio);
+ unsigned bank = GPIO_REG_OFFSET(gpio);
+ unsigned long flags;
+ int ret;
+
+ raw_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);
+
+ if (type & IRQ_TYPE_EDGE_BOTH)
+ irq_set_handler_locked(data, handle_edge_irq);
+ else
+ irq_set_handler_locked(data, handle_level_irq);
+
+ raw_spin_unlock_irqrestore(&pc->irq_lock[bank], flags);
+
+ return ret;
+}
+
+static void bcm2835_gpio_irq_ack(struct irq_data *data)
+{
+ struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
+ struct bcm2835_pinctrl *pc = gpiochip_get_data(chip);
+ unsigned gpio = irqd_to_hwirq(data);
+
+ bcm2835_gpio_set_bit(pc, GPEDS0, gpio);
+}
+
+static int bcm2835_gpio_irq_set_wake(struct irq_data *data, unsigned int on)
+{
+ struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
+ struct bcm2835_pinctrl *pc = gpiochip_get_data(chip);
+ unsigned gpio = irqd_to_hwirq(data);
+ unsigned int irqgroup;
+ int ret = -EINVAL;
+
+ if (!pc->wake_irq)
+ return ret;
+
+ if (gpio <= 27)
+ irqgroup = 0;
+ else if (gpio >= 28 && gpio <= 45)
+ irqgroup = 1;
+ else if (gpio >= 46 && gpio <= 57)
+ irqgroup = 2;
+ else
+ return ret;
+
+ if (on)
+ ret = enable_irq_wake(pc->wake_irq[irqgroup]);
+ else
+ ret = disable_irq_wake(pc->wake_irq[irqgroup]);
+
+ return ret;
+}
+
+static const struct irq_chip bcm2835_gpio_irq_chip = {
+ .name = MODULE_NAME,
+ .irq_set_type = bcm2835_gpio_irq_set_type,
+ .irq_ack = bcm2835_gpio_irq_ack,
+ .irq_mask = bcm2835_gpio_irq_mask,
+ .irq_unmask = bcm2835_gpio_irq_unmask,
+ .irq_set_wake = bcm2835_gpio_irq_set_wake,
+ .flags = (IRQCHIP_MASK_ON_SUSPEND | IRQCHIP_IMMUTABLE),
+ GPIOCHIP_IRQ_RESOURCE_HELPERS,
+};
+
+static int bcm2835_pctl_get_groups_count(struct pinctrl_dev *pctldev)
+{
+ return BCM2835_NUM_GPIOS;
+}
+
+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);
+ struct gpio_chip *chip = &pc->gpio_chip;
+ 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(chip->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, "%pOF: invalid brcm,function %d\n", 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, "%pOF: invalid brcm,pull %d\n", np, pull);
+ return -EINVAL;
+ }
+
+ configs = kzalloc(sizeof(*configs), GFP_KERNEL);
+ if (!configs)
+ return -ENOMEM;
+ configs[0] = pinconf_to_config_packed(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 int bcm2835_pctl_dt_node_to_map(struct pinctrl_dev *pctldev,
+ struct device_node *np,
+ struct pinctrl_map **map, unsigned int *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;
+
+ /* Check for generic binding in this node */
+ err = pinconf_generic_dt_node_to_map_all(pctldev, np, map, num_maps);
+ if (err || *num_maps)
+ return err;
+
+ /* Generic binding did not find anything continue with legacy parse */
+ pins = of_find_property(np, "brcm,pins", NULL);
+ if (!pins) {
+ dev_err(pc->dev, "%pOF: missing brcm,pins property\n", 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,
+ "%pOF: neither brcm,function nor brcm,pull specified\n",
+ 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,
+ "%pOF: brcm,function must have 1 or %d entries\n",
+ np, num_pins);
+ return -EINVAL;
+ }
+
+ if (num_pulls > 1 && num_pulls != num_pins) {
+ dev_err(pc->dev,
+ "%pOF: brcm,pull must have 1 or %d entries\n",
+ np, num_pins);
+ return -EINVAL;
+ }
+
+ maps_per_pin = 0;
+ if (num_funcs)
+ maps_per_pin++;
+ if (num_pulls)
+ maps_per_pin++;
+ cur_map = maps = kcalloc(num_pins * maps_per_pin, sizeof(*maps),
+ GFP_KERNEL);
+ if (!maps)
+ return -ENOMEM;
+
+ for (i = 0; i < num_pins; i++) {
+ err = of_property_read_u32_index(np, "brcm,pins", i, &pin);
+ if (err)
+ goto out;
+ if (pin >= pc->pctl_desc.npins) {
+ dev_err(pc->dev, "%pOF: invalid brcm,pins value %d\n",
+ np, pin);
+ err = -EINVAL;
+ goto out;
+ }
+
+ if (num_funcs) {
+ err = of_property_read_u32_index(np, "brcm,function",
+ (num_funcs > 1) ? i : 0, &func);
+ if (err)
+ goto out;
+ err = bcm2835_pctl_dt_node_to_map_func(pc, np, pin,
+ func, &cur_map);
+ if (err)
+ goto out;
+ }
+ if (num_pulls) {
+ err = of_property_read_u32_index(np, "brcm,pull",
+ (num_pulls > 1) ? i : 0, &pull);
+ if (err)
+ goto out;
+ 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:
+ bcm2835_pctl_dt_free_map(pctldev, maps, num_pins * maps_per_pin);
+ return err;
+}
+
+static const 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_free(struct pinctrl_dev *pctldev,
+ 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);
+ return 0;
+}
+
+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 = BCM2835_NUM_GPIOS;
+
+ return 0;
+}
+
+static int bcm2835_pmx_set(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_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 const struct pinmux_ops bcm2835_pmx_ops = {
+ .free = bcm2835_pmx_free,
+ .get_functions_count = bcm2835_pmx_get_functions_count,
+ .get_function_name = bcm2835_pmx_get_function_name,
+ .get_function_groups = bcm2835_pmx_get_function_groups,
+ .set_mux = bcm2835_pmx_set,
+ .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 void bcm2835_pull_config_set(struct bcm2835_pinctrl *pc,
+ unsigned int pin, unsigned int arg)
+{
+ u32 off, bit;
+
+ off = GPIO_REG_OFFSET(pin);
+ bit = GPIO_REG_SHIFT(pin);
+
+ bcm2835_gpio_wr(pc, GPPUD, arg & 3);
+ /*
+ * BCM2835 datasheet say to wait 150 cycles, but not of what.
+ * But the VideoCore firmware delay for this operation
+ * based nearly on the same amount of VPU cycles and this clock
+ * runs at 250 MHz.
+ */
+ udelay(1);
+ bcm2835_gpio_wr(pc, GPPUDCLK0 + (off * 4), BIT(bit));
+ udelay(1);
+ bcm2835_gpio_wr(pc, GPPUDCLK0 + (off * 4), 0);
+}
+
+static int bcm2835_pinconf_set(struct pinctrl_dev *pctldev,
+ unsigned int pin, unsigned long *configs,
+ unsigned int num_configs)
+{
+ struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
+ u32 param, arg;
+ int i;
+
+ for (i = 0; i < num_configs; i++) {
+ param = pinconf_to_config_param(configs[i]);
+ arg = pinconf_to_config_argument(configs[i]);
+
+ switch (param) {
+ /* Set legacy brcm,pull */
+ case BCM2835_PINCONF_PARAM_PULL:
+ bcm2835_pull_config_set(pc, pin, arg);
+ break;
+
+ /* Set pull generic bindings */
+ case PIN_CONFIG_BIAS_DISABLE:
+ bcm2835_pull_config_set(pc, pin, BCM2835_PUD_OFF);
+ break;
+
+ case PIN_CONFIG_BIAS_PULL_DOWN:
+ bcm2835_pull_config_set(pc, pin, BCM2835_PUD_DOWN);
+ break;
+
+ case PIN_CONFIG_BIAS_PULL_UP:
+ bcm2835_pull_config_set(pc, pin, BCM2835_PUD_UP);
+ break;
+
+ /* Set output-high or output-low */
+ case PIN_CONFIG_OUTPUT:
+ bcm2835_gpio_set_bit(pc, arg ? GPSET0 : GPCLR0, pin);
+ break;
+
+ default:
+ return -ENOTSUPP;
+
+ } /* switch param type */
+ } /* for each config */
+
+ return 0;
+}
+
+static const struct pinconf_ops bcm2835_pinconf_ops = {
+ .is_generic = true,
+ .pin_config_get = bcm2835_pinconf_get,
+ .pin_config_set = bcm2835_pinconf_set,
+};
+
+static void bcm2711_pull_config_set(struct bcm2835_pinctrl *pc,
+ unsigned int pin, unsigned int arg)
+{
+ u32 shifter;
+ u32 value;
+ u32 off;
+
+ off = PUD_2711_REG_OFFSET(pin);
+ shifter = PUD_2711_REG_SHIFT(pin);
+
+ value = bcm2835_gpio_rd(pc, GP_GPIO_PUP_PDN_CNTRL_REG0 + (off * 4));
+ value &= ~(PUD_2711_MASK << shifter);
+ value |= (arg << shifter);
+ bcm2835_gpio_wr(pc, GP_GPIO_PUP_PDN_CNTRL_REG0 + (off * 4), value);
+}
+
+static int bcm2711_pinconf_set(struct pinctrl_dev *pctldev,
+ unsigned int pin, unsigned long *configs,
+ unsigned int num_configs)
+{
+ struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
+ u32 param, arg;
+ int i;
+
+ for (i = 0; i < num_configs; i++) {
+ param = pinconf_to_config_param(configs[i]);
+ arg = pinconf_to_config_argument(configs[i]);
+
+ switch (param) {
+ /* convert legacy brcm,pull */
+ case BCM2835_PINCONF_PARAM_PULL:
+ if (arg == BCM2835_PUD_UP)
+ arg = BCM2711_PULL_UP;
+ else if (arg == BCM2835_PUD_DOWN)
+ arg = BCM2711_PULL_DOWN;
+ else
+ arg = BCM2711_PULL_NONE;
+
+ bcm2711_pull_config_set(pc, pin, arg);
+ break;
+
+ /* Set pull generic bindings */
+ case PIN_CONFIG_BIAS_DISABLE:
+ bcm2711_pull_config_set(pc, pin, BCM2711_PULL_NONE);
+ break;
+ case PIN_CONFIG_BIAS_PULL_DOWN:
+ bcm2711_pull_config_set(pc, pin, BCM2711_PULL_DOWN);
+ break;
+ case PIN_CONFIG_BIAS_PULL_UP:
+ bcm2711_pull_config_set(pc, pin, BCM2711_PULL_UP);
+ break;
+
+ /* Set output-high or output-low */
+ case PIN_CONFIG_OUTPUT:
+ bcm2835_gpio_set_bit(pc, arg ? GPSET0 : GPCLR0, pin);
+ break;
+
+ default:
+ return -ENOTSUPP;
+ }
+ } /* for each config */
+
+ return 0;
+}
+
+static const struct pinconf_ops bcm2711_pinconf_ops = {
+ .is_generic = true,
+ .pin_config_get = bcm2835_pinconf_get,
+ .pin_config_set = bcm2711_pinconf_set,
+};
+
+static const struct pinctrl_desc bcm2835_pinctrl_desc = {
+ .name = MODULE_NAME,
+ .pins = bcm2835_gpio_pins,
+ .npins = BCM2835_NUM_GPIOS,
+ .pctlops = &bcm2835_pctl_ops,
+ .pmxops = &bcm2835_pmx_ops,
+ .confops = &bcm2835_pinconf_ops,
+ .owner = THIS_MODULE,
+};
+
+static const struct pinctrl_desc bcm2711_pinctrl_desc = {
+ .name = "pinctrl-bcm2711",
+ .pins = bcm2835_gpio_pins,
+ .npins = BCM2711_NUM_GPIOS,
+ .pctlops = &bcm2835_pctl_ops,
+ .pmxops = &bcm2835_pmx_ops,
+ .confops = &bcm2711_pinconf_ops,
+ .owner = THIS_MODULE,
+};
+
+static const struct pinctrl_gpio_range bcm2835_pinctrl_gpio_range = {
+ .name = MODULE_NAME,
+ .npins = BCM2835_NUM_GPIOS,
+};
+
+static const struct pinctrl_gpio_range bcm2711_pinctrl_gpio_range = {
+ .name = "pinctrl-bcm2711",
+ .npins = BCM2711_NUM_GPIOS,
+};
+
+struct bcm_plat_data {
+ const struct gpio_chip *gpio_chip;
+ const struct pinctrl_desc *pctl_desc;
+ const struct pinctrl_gpio_range *gpio_range;
+};
+
+static const struct bcm_plat_data bcm2835_plat_data = {
+ .gpio_chip = &bcm2835_gpio_chip,
+ .pctl_desc = &bcm2835_pinctrl_desc,
+ .gpio_range = &bcm2835_pinctrl_gpio_range,
+};
+
+static const struct bcm_plat_data bcm2711_plat_data = {
+ .gpio_chip = &bcm2711_gpio_chip,
+ .pctl_desc = &bcm2711_pinctrl_desc,
+ .gpio_range = &bcm2711_pinctrl_gpio_range,
+};
+
+static const struct of_device_id bcm2835_pinctrl_match[] = {
+ {
+ .compatible = "brcm,bcm2835-gpio",
+ .data = &bcm2835_plat_data,
+ },
+ {
+ .compatible = "brcm,bcm2711-gpio",
+ .data = &bcm2711_plat_data,
+ },
+ {
+ .compatible = "brcm,bcm7211-gpio",
+ .data = &bcm2711_plat_data,
+ },
+ {}
+};
+
+static int bcm2835_pinctrl_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct device_node *np = dev->of_node;
+ const struct bcm_plat_data *pdata;
+ struct bcm2835_pinctrl *pc;
+ struct gpio_irq_chip *girq;
+ struct resource iomem;
+ int err, i;
+ const struct of_device_id *match;
+ int is_7211 = 0;
+
+ BUILD_BUG_ON(ARRAY_SIZE(bcm2835_gpio_pins) != BCM2711_NUM_GPIOS);
+ BUILD_BUG_ON(ARRAY_SIZE(bcm2835_gpio_groups) != BCM2711_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_ioremap_resource(dev, &iomem);
+ if (IS_ERR(pc->base))
+ return PTR_ERR(pc->base);
+
+ match = of_match_node(bcm2835_pinctrl_match, pdev->dev.of_node);
+ if (!match)
+ return -EINVAL;
+
+ pdata = match->data;
+ is_7211 = of_device_is_compatible(np, "brcm,bcm7211-gpio");
+
+ pc->gpio_chip = *pdata->gpio_chip;
+ pc->gpio_chip.parent = dev;
+
+ spin_lock_init(&pc->fsel_lock);
+ for (i = 0; i < BCM2835_NUM_BANKS; i++) {
+ unsigned long events;
+ unsigned offset;
+
+ /* 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));
+
+ raw_spin_lock_init(&pc->irq_lock[i]);
+ }
+
+ pc->pctl_desc = *pdata->pctl_desc;
+ pc->pctl_dev = devm_pinctrl_register(dev, &pc->pctl_desc, pc);
+ if (IS_ERR(pc->pctl_dev)) {
+ gpiochip_remove(&pc->gpio_chip);
+ return PTR_ERR(pc->pctl_dev);
+ }
+
+ pc->gpio_range = *pdata->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);
+
+ girq = &pc->gpio_chip.irq;
+ gpio_irq_chip_set_chip(girq, &bcm2835_gpio_irq_chip);
+ girq->parent_handler = bcm2835_gpio_irq_handler;
+ girq->num_parents = BCM2835_NUM_IRQS;
+ girq->parents = devm_kcalloc(dev, BCM2835_NUM_IRQS,
+ sizeof(*girq->parents),
+ GFP_KERNEL);
+ if (!girq->parents) {
+ err = -ENOMEM;
+ goto out_remove;
+ }
+
+ if (is_7211) {
+ pc->wake_irq = devm_kcalloc(dev, BCM2835_NUM_IRQS,
+ sizeof(*pc->wake_irq),
+ GFP_KERNEL);
+ if (!pc->wake_irq) {
+ err = -ENOMEM;
+ goto out_remove;
+ }
+ }
+
+ /*
+ * Use the same handler for all groups: this is necessary
+ * since we use one gpiochip to cover all lines - the
+ * irq handler then needs to figure out which group and
+ * bank that was firing the IRQ and look up the per-group
+ * and bank data.
+ */
+ for (i = 0; i < BCM2835_NUM_IRQS; i++) {
+ int len;
+ char *name;
+
+ girq->parents[i] = irq_of_parse_and_map(np, i);
+ if (!is_7211) {
+ if (!girq->parents[i]) {
+ girq->num_parents = i;
+ break;
+ }
+ continue;
+ }
+ /* Skip over the all banks interrupts */
+ pc->wake_irq[i] = irq_of_parse_and_map(np, i +
+ BCM2835_NUM_IRQS + 1);
+
+ len = strlen(dev_name(pc->dev)) + 16;
+ name = devm_kzalloc(pc->dev, len, GFP_KERNEL);
+ if (!name) {
+ err = -ENOMEM;
+ goto out_remove;
+ }
+
+ snprintf(name, len, "%s:bank%d", dev_name(pc->dev), i);
+
+ /* These are optional interrupts */
+ err = devm_request_irq(dev, pc->wake_irq[i],
+ bcm2835_gpio_wake_irq_handler,
+ IRQF_SHARED, name, pc);
+ if (err)
+ dev_warn(dev, "unable to request wake IRQ %d\n",
+ pc->wake_irq[i]);
+ }
+
+ girq->default_type = IRQ_TYPE_NONE;
+ girq->handler = handle_level_irq;
+
+ err = gpiochip_add_data(&pc->gpio_chip, pc);
+ if (err) {
+ dev_err(dev, "could not add GPIO chip\n");
+ goto out_remove;
+ }
+
+ return 0;
+
+out_remove:
+ pinctrl_remove_gpio_range(pc->pctl_dev, &pc->gpio_range);
+ return err;
+}
+
+static struct platform_driver bcm2835_pinctrl_driver = {
+ .probe = bcm2835_pinctrl_probe,
+ .driver = {
+ .name = MODULE_NAME,
+ .of_match_table = bcm2835_pinctrl_match,
+ .suppress_bind_attrs = true,
+ },
+};
+module_platform_driver(bcm2835_pinctrl_driver);
+
+MODULE_AUTHOR("Chris Boot");
+MODULE_AUTHOR("Simon Arlott");
+MODULE_AUTHOR("Stephen Warren");
+MODULE_DESCRIPTION("Broadcom BCM2835/2711 pinctrl and GPIO driver");
+MODULE_LICENSE("GPL");
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-18 17:43:06 +0000