| /* |
| * 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/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) |
| 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), |
| }; |
| |
| /* 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 = { |
| .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 = false, |
| }; |
| |
| 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]; |
| |
| generic_handle_irq(irq_linear_revmap(pc->irq_domain, 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 events that were latched prior to clearing event sources */ |
| bcm2835_gpio_set_bit(pc, GPEDS0, gpio); |
| 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); |
| |
| if (type & IRQ_TYPE_EDGE_BOTH) |
| __irq_set_handler_locked(data->irq, handle_edge_irq); |
| else |
| __irq_set_handler_locked(data->irq, handle_level_irq); |
| |
| spin_unlock_irqrestore(&pc->irq_lock[bank], flags); |
| |
| return ret; |
| } |
| |
| static void bcm2835_gpio_irq_ack(struct irq_data *data) |
| { |
| struct bcm2835_pinctrl *pc = irq_data_get_irq_chip_data(data); |
| unsigned gpio = irqd_to_hwirq(data); |
| |
| bcm2835_gpio_set_bit(pc, GPEDS0, gpio); |
| } |
| |
| 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, |
| .irq_ack = bcm2835_gpio_irq_ack, |
| .irq_mask = bcm2835_gpio_irq_disable, |
| .irq_unmask = bcm2835_gpio_irq_enable, |
| }; |
| |
| 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 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++) { |
| err = of_property_read_u32_index(np, "brcm,pins", i, &pin); |
| if (err) |
| goto out; |
| 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) { |
| 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_funcs > 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: |
| kfree(maps); |
| 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_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_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 = { |
| .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 int bcm2835_pinconf_set(struct pinctrl_dev *pctldev, |
| unsigned pin, unsigned long *configs, |
| unsigned num_configs) |
| { |
| struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev); |
| enum bcm2835_pinconf_param param; |
| u16 arg; |
| u32 off, bit; |
| int i; |
| |
| for (i = 0; i < num_configs; i++) { |
| param = BCM2835_PINCONF_UNPACK_PARAM(configs[i]); |
| arg = BCM2835_PINCONF_UNPACK_ARG(configs[i]); |
| |
| 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); |
| } /* for each config */ |
| |
| return 0; |
| } |
| |
| static const 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 = { |
| .name = MODULE_NAME, |
| .npins = BCM2835_NUM_GPIOS, |
| }; |
| |
| static int 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_ioremap_resource(dev, &iomem); |
| if (IS_ERR(pc->base)) |
| return PTR_ERR(pc->base); |
| |
| 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_level_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 (IS_ERR(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 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 const struct of_device_id bcm2835_pinctrl_match[] = { |
| { .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, |
| .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"); |