[PATCH v7 2/4] pinctrl: cygnus: add gpio/pinconf driver
Ray Jui
rjui at broadcom.com
Tue Feb 3 17:09:06 PST 2015
This adds the initial support of the Broadcom Cygnus GPIO/PINCONF driver
that supports all 3 GPIO controllers on Cygnus including the ASIU GPIO
controller, the chipCommonG GPIO controller, and the always-on GPIO
controller. Basic PINCONF configurations such as bias pull up/down, and
drive strength are also supported in this driver.
Pins from the ASIU GPIO controller can be individually muxed to GPIO
function, through interaction with the Cygnus IOMUX controller
Signed-off-by: Ray Jui <rjui at broadcom.com>
Reviewed-by: Scott Branden <sbranden at broadcom.com>
---
drivers/pinctrl/bcm/Kconfig | 22 +
drivers/pinctrl/bcm/Makefile | 1 +
drivers/pinctrl/bcm/pinctrl-cygnus-gpio.c | 920 +++++++++++++++++++++++++++++
3 files changed, 943 insertions(+)
create mode 100644 drivers/pinctrl/bcm/pinctrl-cygnus-gpio.c
diff --git a/drivers/pinctrl/bcm/Kconfig b/drivers/pinctrl/bcm/Kconfig
index eb13201..cd11d4d 100644
--- a/drivers/pinctrl/bcm/Kconfig
+++ b/drivers/pinctrl/bcm/Kconfig
@@ -20,6 +20,28 @@ config PINCTRL_BCM2835
select PINMUX
select PINCONF
+config PINCTRL_CYGNUS_GPIO
+ bool "Broadcom Cygnus GPIO (with PINCONF) driver"
+ depends on OF_GPIO && ARCH_BCM_CYGNUS
+ select GPIOLIB_IRQCHIP
+ select PINCONF
+ select GENERIC_PINCONF
+ default ARCH_BCM_CYGNUS
+ help
+ Say yes here to enable the Broadcom Cygnus GPIO driver.
+
+ The Broadcom Cygnus SoC has 3 GPIO controllers including the ASIU
+ GPIO controller (ASIU), the chipCommonG GPIO controller (CCM), and
+ the always-ON GPIO controller (CRMU/AON). All 3 GPIO controllers are
+ supported by this driver.
+
+ All 3 Cygnus GPIO controllers support basic PINCONF functions such
+ as bias pull up, pull down, and drive strength configurations, when
+ these pins are muxed to GPIO.
+
+ Pins from the ASIU GPIO can be individually muxed to GPIO function,
+ through interaction with the Cygnus IOMUX controller.
+
config PINCTRL_CYGNUS_MUX
bool "Broadcom Cygnus IOMUX driver"
depends on (ARCH_BCM_CYGNUS || COMPILE_TEST)
diff --git a/drivers/pinctrl/bcm/Makefile b/drivers/pinctrl/bcm/Makefile
index bb6beb6..2b2f70e 100644
--- a/drivers/pinctrl/bcm/Makefile
+++ b/drivers/pinctrl/bcm/Makefile
@@ -2,4 +2,5 @@
obj-$(CONFIG_PINCTRL_BCM281XX) += pinctrl-bcm281xx.o
obj-$(CONFIG_PINCTRL_BCM2835) += pinctrl-bcm2835.o
+obj-$(CONFIG_PINCTRL_CYGNUS_GPIO) += pinctrl-cygnus-gpio.o
obj-$(CONFIG_PINCTRL_CYGNUS_MUX) += pinctrl-cygnus-mux.o
diff --git a/drivers/pinctrl/bcm/pinctrl-cygnus-gpio.c b/drivers/pinctrl/bcm/pinctrl-cygnus-gpio.c
new file mode 100644
index 0000000..cfe4478
--- /dev/null
+++ b/drivers/pinctrl/bcm/pinctrl-cygnus-gpio.c
@@ -0,0 +1,920 @@
+/*
+ * Copyright (C) 2014-2015 Broadcom Corporation
+ *
+ * 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 version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * This file contains the Broadcom Cygnus GPIO driver that supports 3
+ * GPIO controllers on Cygnus including the ASIU GPIO controller, the
+ * chipCommonG GPIO controller, and the always-on GPIO controller. Basic
+ * PINCONF such as bias pull up/down, and drive strength are also supported
+ * in this driver.
+ *
+ * Pins from the ASIU GPIO can be individually muxed to GPIO function,
+ * through the interaction with the Cygnus IOMUX controller
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/gpio.h>
+#include <linux/ioport.h>
+#include <linux/of_device.h>
+#include <linux/of_irq.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/pinctrl/pinconf.h>
+#include <linux/pinctrl/pinconf-generic.h>
+
+#include "../pinctrl-utils.h"
+
+#define CYGNUS_GPIO_DATA_IN_OFFSET 0x00
+#define CYGNUS_GPIO_DATA_OUT_OFFSET 0x04
+#define CYGNUS_GPIO_OUT_EN_OFFSET 0x08
+#define CYGNUS_GPIO_IN_TYPE_OFFSET 0x0c
+#define CYGNUS_GPIO_INT_DE_OFFSET 0x10
+#define CYGNUS_GPIO_INT_EDGE_OFFSET 0x14
+#define CYGNUS_GPIO_INT_MSK_OFFSET 0x18
+#define CYGNUS_GPIO_INT_STAT_OFFSET 0x1c
+#define CYGNUS_GPIO_INT_MSTAT_OFFSET 0x20
+#define CYGNUS_GPIO_INT_CLR_OFFSET 0x24
+#define CYGNUS_GPIO_PAD_RES_OFFSET 0x34
+#define CYGNUS_GPIO_RES_EN_OFFSET 0x38
+
+/* drive strength control for ASIU GPIO */
+#define CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET 0x58
+
+/* drive strength control for CCM/CRMU (AON) GPIO */
+#define CYGNUS_GPIO_DRV0_CTRL_OFFSET 0x00
+
+#define GPIO_BANK_SIZE 0x200
+#define NGPIOS_PER_BANK 32
+#define GPIO_BANK(pin) ((pin) / NGPIOS_PER_BANK)
+
+#define CYGNUS_GPIO_REG(pin, reg) (GPIO_BANK(pin) * GPIO_BANK_SIZE + (reg))
+#define CYGNUS_GPIO_SHIFT(pin) ((pin) % NGPIOS_PER_BANK)
+
+#define GPIO_DRV_STRENGTH_BIT_SHIFT 20
+#define GPIO_DRV_STRENGTH_BITS 3
+#define GPIO_DRV_STRENGTH_BIT_MASK ((1 << GPIO_DRV_STRENGTH_BITS) - 1)
+
+/*
+ * Cygnus GPIO core
+ *
+ * @dev: pointer to device
+ * @base: I/O register base for Cygnus GPIO controller
+ * @io_ctrl: I/O register base for certain type of Cygnus GPIO controller that
+ * has the PINCONF support implemented outside of the GPIO block
+ * @lock: lock to protect access to I/O registers
+ * @gc: GPIO chip
+ * @num_banks: number of GPIO banks, each bank supports up to 32 GPIOs
+ * @pinmux_is_supported: flag to indicate this GPIO controller contains pins
+ * that can be individually muxed to GPIO
+ * @pctl: pointer to pinctrl_dev
+ * @pctldesc: pinctrl descriptor
+ * @pins: pointer to array of pins
+ */
+struct cygnus_gpio {
+ struct device *dev;
+
+ void __iomem *base;
+ void __iomem *io_ctrl;
+
+ spinlock_t lock;
+
+ struct gpio_chip gc;
+ unsigned num_banks;
+
+ int pinmux_is_supported;
+
+ struct pinctrl_dev *pctl;
+ struct pinctrl_desc pctldesc;
+ struct pinctrl_pin_desc *pins;
+};
+
+static struct cygnus_gpio *to_cygnus_gpio(struct gpio_chip *gc)
+{
+ return container_of(gc, struct cygnus_gpio, gc);
+}
+
+/*
+ * Mapping from PINCONF pins to GPIO pins is 1-to-1
+ */
+static unsigned cygnus_pin_to_gpio(unsigned pin)
+{
+ return pin;
+}
+
+static u32 cygnus_readl(struct cygnus_gpio *chip, unsigned int offset)
+{
+ return readl(chip->base + offset);
+}
+
+static void cygnus_writel(struct cygnus_gpio *chip, unsigned int offset,
+ u32 val)
+{
+ writel(val, chip->base + offset);
+}
+
+/**
+ * cygnus_set_bit - set or clear one bit (corresponding to the GPIO pin) in a
+ * Cygnus GPIO register
+ *
+ * @cygnus_gpio: Cygnus GPIO device
+ * @reg: register offset
+ * @gpio: GPIO pin
+ * @set: set or clear. 1 - set; 0 -clear
+ */
+static void cygnus_set_bit(struct cygnus_gpio *chip, unsigned int reg,
+ unsigned gpio, int set)
+{
+ unsigned int offset = CYGNUS_GPIO_REG(gpio, reg);
+ unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
+ u32 val;
+
+ val = cygnus_readl(chip, offset);
+ if (set)
+ val |= BIT(shift);
+ else
+ val &= ~BIT(shift);
+ cygnus_writel(chip, offset, val);
+}
+
+static int cygnus_get_bit(struct cygnus_gpio *chip, unsigned int reg,
+ unsigned gpio)
+{
+ unsigned int offset = CYGNUS_GPIO_REG(gpio, reg);
+ unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
+ u32 val;
+
+ val = cygnus_readl(chip, offset) & BIT(shift);
+ if (val)
+ return 1;
+ else
+ return 0;
+}
+
+static void cygnus_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
+{
+ struct gpio_chip *gc = irq_desc_get_handler_data(desc);
+ struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+ struct irq_chip *irq_chip = irq_desc_get_chip(desc);
+ int i, bit;
+
+ chained_irq_enter(irq_chip, desc);
+
+ /* go through the entire GPIO banks and handle all interrupts */
+ for (i = 0; i < chip->num_banks; i++) {
+ unsigned long val = cygnus_readl(chip,
+ (i * GPIO_BANK_SIZE) +
+ CYGNUS_GPIO_INT_MSTAT_OFFSET);
+
+ for_each_set_bit(bit, &val, NGPIOS_PER_BANK) {
+ unsigned pin = NGPIOS_PER_BANK * i + bit;
+ int child_irq = irq_find_mapping(gc->irqdomain, pin);
+
+ /*
+ * Clear the interrupt before invoking the
+ * handler, so we do not leave any window
+ */
+ cygnus_writel(chip, (i * GPIO_BANK_SIZE) +
+ CYGNUS_GPIO_INT_CLR_OFFSET, BIT(bit));
+
+ generic_handle_irq(child_irq);
+ }
+ }
+
+ chained_irq_exit(irq_chip, desc);
+}
+
+
+static void cygnus_gpio_irq_ack(struct irq_data *d)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+ unsigned gpio = d->hwirq;
+ unsigned int offset = CYGNUS_GPIO_REG(gpio,
+ CYGNUS_GPIO_INT_CLR_OFFSET);
+ unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
+ u32 val = BIT(shift);
+
+ cygnus_writel(chip, offset, val);
+}
+
+/**
+ * cygnus_gpio_irq_set_mask - mask/unmask a GPIO interrupt
+ *
+ * @d: IRQ chip data
+ * @mask: mask/unmask GPIO interrupt. 0 - mask (disable); 1 - unmask (enable)
+ */
+static void cygnus_gpio_irq_set_mask(struct irq_data *d, int mask)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+ unsigned gpio = d->hwirq;
+
+ cygnus_set_bit(chip, CYGNUS_GPIO_INT_MSK_OFFSET, gpio, mask);
+}
+
+static void cygnus_gpio_irq_mask(struct irq_data *d)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+ unsigned long flags;
+
+ spin_lock_irqsave(&chip->lock, flags);
+ cygnus_gpio_irq_set_mask(d, 0);
+ spin_unlock_irqrestore(&chip->lock, flags);
+}
+
+static void cygnus_gpio_irq_unmask(struct irq_data *d)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+ unsigned long flags;
+
+ spin_lock_irqsave(&chip->lock, flags);
+ cygnus_gpio_irq_set_mask(d, 1);
+ spin_unlock_irqrestore(&chip->lock, flags);
+}
+
+static int cygnus_gpio_irq_set_type(struct irq_data *d, unsigned int type)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+ unsigned gpio = d->hwirq;
+ int int_type = 0, dual_edge = 0, edge_lvl = 0;
+ unsigned long flags;
+
+ switch (type & IRQ_TYPE_SENSE_MASK) {
+ case IRQ_TYPE_EDGE_RISING:
+ edge_lvl = 1;
+ break;
+
+ case IRQ_TYPE_EDGE_FALLING:
+ break;
+
+ case IRQ_TYPE_EDGE_BOTH:
+ dual_edge = 1;
+ break;
+
+ case IRQ_TYPE_LEVEL_HIGH:
+ int_type = 1;
+ edge_lvl = 1;
+ break;
+
+ case IRQ_TYPE_LEVEL_LOW:
+ int_type = 1;
+ break;
+
+ default:
+ dev_err(chip->dev, "invalid GPIO IRQ type 0x%x\n",
+ type);
+ return -EINVAL;
+ }
+
+ spin_lock_irqsave(&chip->lock, flags);
+ cygnus_set_bit(chip, CYGNUS_GPIO_IN_TYPE_OFFSET, gpio, int_type);
+ cygnus_set_bit(chip, CYGNUS_GPIO_INT_DE_OFFSET, gpio, dual_edge);
+ cygnus_set_bit(chip, CYGNUS_GPIO_INT_EDGE_OFFSET, gpio,
+ edge_lvl);
+ spin_unlock_irqrestore(&chip->lock, flags);
+
+ dev_dbg(chip->dev,
+ "gpio:%u set int_type:%d dual_edge:%d edge_lvl:%d\n",
+ gpio, int_type, dual_edge, edge_lvl);
+
+ return 0;
+}
+
+static struct irq_chip cygnus_gpio_irq_chip = {
+ .name = "bcm-cygnus-gpio",
+ .irq_ack = cygnus_gpio_irq_ack,
+ .irq_mask = cygnus_gpio_irq_mask,
+ .irq_unmask = cygnus_gpio_irq_unmask,
+ .irq_set_type = cygnus_gpio_irq_set_type,
+};
+
+/*
+ * Request the Cygnus IOMUX pinmux controller to mux individual pins to GPIO
+ */
+static int cygnus_gpio_request(struct gpio_chip *gc, unsigned offset)
+{
+ struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+ unsigned gpio = gc->base + offset;
+
+ /* not all Cygnus GPIO pins can be muxed individually */
+ if (!chip->pinmux_is_supported)
+ return 0;
+
+ return pinctrl_request_gpio(gpio);
+}
+
+static void cygnus_gpio_free(struct gpio_chip *gc, unsigned offset)
+{
+ struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+ unsigned gpio = gc->base + offset;
+
+ if (!chip->pinmux_is_supported)
+ return;
+
+ pinctrl_free_gpio(gpio);
+}
+
+static int cygnus_gpio_direction_input(struct gpio_chip *gc, unsigned gpio)
+{
+ struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+ unsigned long flags;
+
+ spin_lock_irqsave(&chip->lock, flags);
+ cygnus_set_bit(chip, CYGNUS_GPIO_OUT_EN_OFFSET, gpio, 0);
+ spin_unlock_irqrestore(&chip->lock, flags);
+
+ dev_dbg(chip->dev, "gpio:%u set input\n", gpio);
+
+ return 0;
+}
+
+static int cygnus_gpio_direction_output(struct gpio_chip *gc, unsigned gpio,
+ int value)
+{
+ struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+ unsigned long flags;
+
+ spin_lock_irqsave(&chip->lock, flags);
+ cygnus_set_bit(chip, CYGNUS_GPIO_OUT_EN_OFFSET, gpio, 1);
+ cygnus_set_bit(chip, CYGNUS_GPIO_DATA_OUT_OFFSET, gpio, value);
+ spin_unlock_irqrestore(&chip->lock, flags);
+
+ dev_dbg(chip->dev, "gpio:%u set output, value:%d\n", gpio, value);
+
+ return 0;
+}
+
+static void cygnus_gpio_set(struct gpio_chip *gc, unsigned gpio, int value)
+{
+ struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+ unsigned long flags;
+
+ spin_lock_irqsave(&chip->lock, flags);
+ cygnus_set_bit(chip, CYGNUS_GPIO_DATA_OUT_OFFSET, gpio, value);
+ spin_unlock_irqrestore(&chip->lock, flags);
+
+ dev_dbg(chip->dev, "gpio:%u set, value:%d\n", gpio, value);
+}
+
+static int cygnus_gpio_get(struct gpio_chip *gc, unsigned gpio)
+{
+ struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+ unsigned int offset = CYGNUS_GPIO_REG(gpio,
+ CYGNUS_GPIO_DATA_IN_OFFSET);
+ unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
+
+ return !!(cygnus_readl(chip, offset) & BIT(shift));
+}
+
+static int cygnus_get_groups_count(struct pinctrl_dev *pctldev)
+{
+ return 1;
+}
+
+/*
+ * Only one group: "gpio_grp", since this local pinctrl device only performs
+ * GPIO specific PINCONF configurations
+ */
+static const char *cygnus_get_group_name(struct pinctrl_dev *pctldev,
+ unsigned selector)
+{
+
+ return "gpio_grp";
+}
+
+static const struct pinctrl_ops cygnus_pctrl_ops = {
+ .get_groups_count = cygnus_get_groups_count,
+ .get_group_name = cygnus_get_group_name,
+ .dt_node_to_map = pinconf_generic_dt_node_to_map_pin,
+ .dt_free_map = pinctrl_utils_dt_free_map,
+};
+
+static int cygnus_gpio_set_pull(struct cygnus_gpio *chip, unsigned gpio,
+ int disable, int pull_up)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&chip->lock, flags);
+
+ if (disable) {
+ cygnus_set_bit(chip, CYGNUS_GPIO_RES_EN_OFFSET, gpio, 0);
+ } else {
+ cygnus_set_bit(chip, CYGNUS_GPIO_PAD_RES_OFFSET, gpio,
+ pull_up);
+ cygnus_set_bit(chip, CYGNUS_GPIO_RES_EN_OFFSET, gpio, 1);
+ }
+
+ spin_unlock_irqrestore(&chip->lock, flags);
+
+ dev_dbg(chip->dev, "gpio:%u set pullup:%d\n", gpio, pull_up);
+
+ return 0;
+}
+
+static void cygnus_gpio_get_pull(struct cygnus_gpio *chip, unsigned gpio,
+ int *disable, int *pull_up)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&chip->lock, flags);
+ *disable = !cygnus_get_bit(chip, CYGNUS_GPIO_RES_EN_OFFSET, gpio);
+ *pull_up = cygnus_get_bit(chip, CYGNUS_GPIO_PAD_RES_OFFSET, gpio);
+ spin_unlock_irqrestore(&chip->lock, flags);
+}
+
+static int cygnus_gpio_set_strength(struct cygnus_gpio *chip, unsigned gpio,
+ unsigned strength)
+{
+ void __iomem *base;
+ unsigned int i, offset, shift;
+ u32 val;
+ unsigned long flags;
+
+ /* make sure drive strength is supported */
+ if (strength < 2 || strength > 16 || (strength % 2))
+ return -ENOTSUPP;
+
+ if (chip->io_ctrl) {
+ base = chip->io_ctrl;
+ offset = CYGNUS_GPIO_DRV0_CTRL_OFFSET;
+ } else {
+ base = chip->base;
+ offset = CYGNUS_GPIO_REG(gpio,
+ CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET);
+ }
+
+ shift = CYGNUS_GPIO_SHIFT(gpio);
+
+ dev_dbg(chip->dev, "gpio:%u set drive strength:%d mA\n", gpio,
+ strength);
+
+ spin_lock_irqsave(&chip->lock, flags);
+ strength = (strength / 2) - 1;
+ for (i = 0; i < GPIO_DRV_STRENGTH_BITS; i++) {
+ val = readl(base + offset);
+ val &= ~BIT(shift);
+ val |= ((strength >> i) & 0x1) << shift;
+ writel(val, base + offset);
+ offset += 4;
+ }
+ spin_unlock_irqrestore(&chip->lock, flags);
+
+ return 0;
+}
+
+static int cygnus_gpio_get_strength(struct cygnus_gpio *chip, unsigned gpio,
+ u16 *strength)
+{
+ void __iomem *base;
+ unsigned int i, offset, shift;
+ u32 val;
+ unsigned long flags;
+
+ if (chip->io_ctrl) {
+ base = chip->io_ctrl;
+ offset = CYGNUS_GPIO_DRV0_CTRL_OFFSET;
+ } else {
+ base = chip->base;
+ offset = CYGNUS_GPIO_REG(gpio,
+ CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET);
+ }
+
+ shift = CYGNUS_GPIO_SHIFT(gpio);
+
+ spin_lock_irqsave(&chip->lock, flags);
+ *strength = 0;
+ for (i = 0; i < GPIO_DRV_STRENGTH_BITS; i++) {
+ val = readl(base + offset) & BIT(shift);
+ val >>= shift;
+ *strength += (val << i);
+ offset += 4;
+ }
+
+ /* convert to mA */
+ *strength = (*strength + 1) * 2;
+ spin_unlock_irqrestore(&chip->lock, flags);
+
+ return 0;
+}
+
+static int cygnus_pin_config_get(struct pinctrl_dev *pctldev, unsigned pin,
+ unsigned long *config)
+{
+ struct cygnus_gpio *chip = pinctrl_dev_get_drvdata(pctldev);
+ enum pin_config_param param = pinconf_to_config_param(*config);
+ unsigned gpio = cygnus_pin_to_gpio(pin);
+ u16 arg;
+ int disable, pull_up, ret;
+
+ switch (param) {
+ case PIN_CONFIG_BIAS_DISABLE:
+ cygnus_gpio_get_pull(chip, gpio, &disable, &pull_up);
+ if (disable)
+ return 0;
+ else
+ return -EINVAL;
+
+ case PIN_CONFIG_BIAS_PULL_UP:
+ cygnus_gpio_get_pull(chip, gpio, &disable, &pull_up);
+ if (!disable && pull_up)
+ return 0;
+ else
+ return -EINVAL;
+
+ case PIN_CONFIG_BIAS_PULL_DOWN:
+ cygnus_gpio_get_pull(chip, gpio, &disable, &pull_up);
+ if (!disable && !pull_up)
+ return 0;
+ else
+ return -EINVAL;
+
+ case PIN_CONFIG_DRIVE_STRENGTH:
+ ret = cygnus_gpio_get_strength(chip, gpio, &arg);
+ if (ret)
+ return ret;
+ else
+ *config = pinconf_to_config_packed(param, arg);
+
+ return 0;
+
+ default:
+ return -ENOTSUPP;
+ }
+
+ return -ENOTSUPP;
+}
+
+static int cygnus_pin_config_set(struct pinctrl_dev *pctldev, unsigned pin,
+ unsigned long *configs, unsigned num_configs)
+{
+ struct cygnus_gpio *chip = pinctrl_dev_get_drvdata(pctldev);
+ enum pin_config_param param;
+ u16 arg;
+ unsigned i, gpio = cygnus_pin_to_gpio(pin);
+ int ret = -ENOTSUPP;
+
+ for (i = 0; i < num_configs; i++) {
+ param = pinconf_to_config_param(configs[i]);
+ arg = pinconf_to_config_argument(configs[i]);
+
+ switch (param) {
+ case PIN_CONFIG_BIAS_DISABLE:
+ ret = cygnus_gpio_set_pull(chip, gpio, 1, 0);
+ if (ret < 0)
+ goto out;
+ break;
+
+ case PIN_CONFIG_BIAS_PULL_UP:
+ ret = cygnus_gpio_set_pull(chip, gpio, 0, 1);
+ if (ret < 0)
+ goto out;
+ break;
+
+ case PIN_CONFIG_BIAS_PULL_DOWN:
+ ret = cygnus_gpio_set_pull(chip, gpio, 0, 0);
+ if (ret < 0)
+ goto out;
+ break;
+
+ case PIN_CONFIG_DRIVE_STRENGTH:
+ ret = cygnus_gpio_set_strength(chip, gpio, arg);
+ if (ret < 0)
+ goto out;
+ break;
+
+ default:
+ dev_err(chip->dev, "invalid configuration\n");
+ return -ENOTSUPP;
+ }
+ } /* for each config */
+
+out:
+ return ret;
+}
+
+static const struct pinconf_ops cygnus_pconf_ops = {
+ .is_generic = true,
+ .pin_config_get = cygnus_pin_config_get,
+ .pin_config_set = cygnus_pin_config_set,
+};
+
+/*
+ * Map a GPIO in the local gpio_chip pin space to a pin in the Cygnus IOMUX
+ * pinctrl pin space
+ */
+struct cygnus_gpio_pin_range {
+ unsigned offset;
+ unsigned pin_base;
+ unsigned num_pins;
+};
+
+#define CYGNUS_PINRANGE(o, p, n) { .offset = o, .pin_base = p, .num_pins = n }
+
+/*
+ * Pin mapping table for mapping local GPIO pins to Cygnus IOMUX pinctrl pins
+ */
+static const struct cygnus_gpio_pin_range cygnus_gpio_pintable[] = {
+ CYGNUS_PINRANGE(0, 42, 1),
+ CYGNUS_PINRANGE(1, 44, 3),
+ CYGNUS_PINRANGE(4, 48, 1),
+ CYGNUS_PINRANGE(5, 50, 3),
+ CYGNUS_PINRANGE(8, 126, 1),
+ CYGNUS_PINRANGE(9, 155, 1),
+ CYGNUS_PINRANGE(10, 152, 1),
+ CYGNUS_PINRANGE(11, 154, 1),
+ CYGNUS_PINRANGE(12, 153, 1),
+ CYGNUS_PINRANGE(13, 127, 3),
+ CYGNUS_PINRANGE(16, 140, 1),
+ CYGNUS_PINRANGE(17, 145, 7),
+ CYGNUS_PINRANGE(24, 130, 10),
+ CYGNUS_PINRANGE(34, 141, 4),
+ CYGNUS_PINRANGE(38, 54, 1),
+ CYGNUS_PINRANGE(39, 56, 3),
+ CYGNUS_PINRANGE(42, 60, 3),
+ CYGNUS_PINRANGE(45, 64, 3),
+ CYGNUS_PINRANGE(48, 68, 2),
+ CYGNUS_PINRANGE(50, 84, 6),
+ CYGNUS_PINRANGE(56, 94, 6),
+ CYGNUS_PINRANGE(62, 72, 1),
+ CYGNUS_PINRANGE(63, 70, 1),
+ CYGNUS_PINRANGE(64, 80, 1),
+ CYGNUS_PINRANGE(65, 74, 3),
+ CYGNUS_PINRANGE(68, 78, 1),
+ CYGNUS_PINRANGE(69, 82, 1),
+ CYGNUS_PINRANGE(70, 156, 17),
+ CYGNUS_PINRANGE(87, 104, 12),
+ CYGNUS_PINRANGE(99, 102, 2),
+ CYGNUS_PINRANGE(101, 90, 4),
+ CYGNUS_PINRANGE(105, 116, 10),
+ CYGNUS_PINRANGE(123, 11, 1),
+ CYGNUS_PINRANGE(124, 38, 4),
+ CYGNUS_PINRANGE(128, 43, 1),
+ CYGNUS_PINRANGE(129, 47, 1),
+ CYGNUS_PINRANGE(130, 49, 1),
+ CYGNUS_PINRANGE(131, 53, 1),
+ CYGNUS_PINRANGE(132, 55, 1),
+ CYGNUS_PINRANGE(133, 59, 1),
+ CYGNUS_PINRANGE(134, 63, 1),
+ CYGNUS_PINRANGE(135, 67, 1),
+ CYGNUS_PINRANGE(136, 71, 1),
+ CYGNUS_PINRANGE(137, 73, 1),
+ CYGNUS_PINRANGE(138, 77, 1),
+ CYGNUS_PINRANGE(139, 79, 1),
+ CYGNUS_PINRANGE(140, 81, 1),
+ CYGNUS_PINRANGE(141, 83, 1),
+ CYGNUS_PINRANGE(142, 10, 1)
+};
+
+/*
+ * The Cygnus IOMUX controller mainly supports group based mux configuration,
+ * but certain pins can be muxed to GPIO individually. Only the ASIU GPIO
+ * controller can support this, so it's an optional configuration
+ *
+ * Return -ENODEV means no support and that's fine
+ */
+static int cygnus_gpio_pinmux_add_range(struct cygnus_gpio *chip)
+{
+ struct device_node *node = chip->dev->of_node;
+ struct device_node *pinmux_node;
+ struct platform_device *pinmux_pdev;
+ struct gpio_chip *gc = &chip->gc;
+ int i, ret;
+
+ /* parse DT to find the phandle to the pinmux controller */
+ pinmux_node = of_parse_phandle(node, "pinmux", 0);
+ if (!pinmux_node)
+ return -ENODEV;
+
+ pinmux_pdev = of_find_device_by_node(pinmux_node);
+ if (!pinmux_pdev) {
+ dev_err(chip->dev, "failed to get pinmux device\n");
+ return -EINVAL;
+ }
+
+ /* now need to create the mapping between local GPIO and PINMUX pins */
+ for (i = 0; i < ARRAY_SIZE(cygnus_gpio_pintable); i++) {
+ ret = gpiochip_add_pin_range(gc, dev_name(&pinmux_pdev->dev),
+ cygnus_gpio_pintable[i].offset,
+ cygnus_gpio_pintable[i].pin_base,
+ cygnus_gpio_pintable[i].num_pins);
+ if (ret) {
+ dev_err(chip->dev, "unable to add GPIO pin range\n");
+ goto err_rm_pin_range;
+ }
+ }
+
+ chip->pinmux_is_supported = 1;
+ return 0;
+
+err_rm_pin_range:
+ gpiochip_remove_pin_ranges(gc);
+ return ret;
+}
+
+static void cygnus_gpio_pinmux_remove_range(struct cygnus_gpio *chip)
+{
+ struct gpio_chip *gc = &chip->gc;
+
+ if (chip->pinmux_is_supported)
+ gpiochip_remove_pin_ranges(gc);
+}
+
+/*
+ * Cygnus GPIO controller supports some PINCONF related configurations such as
+ * pull up, pull down, and drive strength, when the pin is configured to GPIO
+ *
+ * Here a local pinctrl device is created with simple 1-to-1 pin mapping to the
+ * local GPIO pins
+ */
+static int cygnus_gpio_register_pinconf(struct cygnus_gpio *chip)
+{
+ struct pinctrl_desc *pctldesc = &chip->pctldesc;
+ struct pinctrl_pin_desc *pins;
+ struct gpio_chip *gc = &chip->gc;
+ int i, ret;
+
+ pins = devm_kcalloc(chip->dev, gc->ngpio, sizeof(*pins), GFP_KERNEL);
+ if (!pins)
+ return -ENOMEM;
+ chip->pins = pins;
+
+ for (i = 0; i < gc->ngpio; i++) {
+ pins[i].number = i;
+ pins[i].name = kasprintf(GFP_KERNEL, "gpio-%d", i);
+ if (!pins[i].name) {
+ ret = -ENOMEM;
+ goto err_kfree;
+ }
+ }
+
+ pctldesc->name = dev_name(chip->dev);
+ pctldesc->pctlops = &cygnus_pctrl_ops;
+ pctldesc->pins = pins;
+ pctldesc->npins = gc->ngpio;
+ pctldesc->confops = &cygnus_pconf_ops;
+
+ chip->pctl = pinctrl_register(pctldesc, chip->dev, chip);
+ if (!chip->pctl) {
+ dev_err(chip->dev, "unable to register pinctrl device\n");
+ ret = -EINVAL;
+ goto err_kfree;
+ }
+
+ return 0;
+
+err_kfree:
+ for (i = 0; i < gc->ngpio; i++)
+ kfree(pins[i].name);
+
+ return ret;
+}
+
+static void cygnus_gpio_unregister_pinconf(struct cygnus_gpio *chip)
+{
+ struct gpio_chip *gc = &chip->gc;
+ int i;
+
+ if (chip->pctl)
+ pinctrl_unregister(chip->pctl);
+
+ for (i = 0; i < gc->ngpio; i++)
+ kfree(chip->pins[i].name);
+}
+
+static const struct of_device_id cygnus_gpio_of_match[] = {
+ { .compatible = "brcm,cygnus-gpio" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, cygnus_gpio_of_match);
+
+static int cygnus_gpio_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct resource *res;
+ struct cygnus_gpio *chip;
+ struct gpio_chip *gc;
+ u32 ngpios;
+ int irq, ret;
+
+ chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
+ if (!chip)
+ return -ENOMEM;
+
+ chip->dev = dev;
+ platform_set_drvdata(pdev, chip);
+
+ if (of_property_read_u32(dev->of_node, "ngpios", &ngpios)) {
+ dev_err(dev, "missing ngpios DT property\n");
+ return -ENODEV;
+ }
+ chip->num_banks = (ngpios + NGPIOS_PER_BANK - 1) / NGPIOS_PER_BANK;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ chip->base = devm_ioremap_resource(dev, res);
+ if (IS_ERR(chip->base)) {
+ dev_err(dev, "unable to map I/O memory\n");
+ return PTR_ERR(chip->base);
+ }
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ if (res) {
+ chip->io_ctrl = devm_ioremap_resource(dev, res);
+ if (IS_ERR(chip->io_ctrl)) {
+ dev_err(dev, "unable to map I/O memory\n");
+ return PTR_ERR(chip->io_ctrl);
+ }
+ }
+
+ spin_lock_init(&chip->lock);
+
+ gc = &chip->gc;
+ gc->base = -1;
+ gc->ngpio = ngpios;
+ gc->label = dev_name(dev);
+ gc->dev = dev;
+ gc->of_node = dev->of_node;
+ gc->request = cygnus_gpio_request;
+ gc->free = cygnus_gpio_free;
+ gc->direction_input = cygnus_gpio_direction_input;
+ gc->direction_output = cygnus_gpio_direction_output;
+ gc->set = cygnus_gpio_set;
+ gc->get = cygnus_gpio_get;
+
+ ret = gpiochip_add(gc);
+ if (ret < 0) {
+ dev_err(dev, "unable to add GPIO chip\n");
+ return ret;
+ }
+
+ ret = cygnus_gpio_pinmux_add_range(chip);
+ if (ret && ret != -ENODEV) {
+ dev_err(dev, "unable to add GPIO pin range\n");
+ goto err_rm_gpiochip;
+ }
+
+ ret = cygnus_gpio_register_pinconf(chip);
+ if (ret) {
+ dev_err(dev, "unable to register pinconf\n");
+ goto err_rm_range;
+ }
+
+ /* optional GPIO interrupt support */
+ irq = platform_get_irq(pdev, 0);
+ if (irq) {
+ ret = gpiochip_irqchip_add(gc, &cygnus_gpio_irq_chip, 0,
+ handle_simple_irq, IRQ_TYPE_NONE);
+ if (ret) {
+ dev_err(dev, "no GPIO irqchip\n");
+ goto err_unregister_pinconf;
+ }
+
+ gpiochip_set_chained_irqchip(gc, &cygnus_gpio_irq_chip, irq,
+ cygnus_gpio_irq_handler);
+ }
+
+ return 0;
+
+err_unregister_pinconf:
+ cygnus_gpio_unregister_pinconf(chip);
+
+err_rm_range:
+ cygnus_gpio_pinmux_remove_range(chip);
+
+err_rm_gpiochip:
+ gpiochip_remove(gc);
+
+ return ret;
+}
+
+static struct platform_driver cygnus_gpio_driver = {
+ .driver = {
+ .name = "cygnus-gpio",
+ .of_match_table = cygnus_gpio_of_match,
+ },
+ .probe = cygnus_gpio_probe,
+};
+
+static int __init cygnus_gpio_init(void)
+{
+ return platform_driver_probe(&cygnus_gpio_driver, cygnus_gpio_probe);
+}
+arch_initcall_sync(cygnus_gpio_init);
+
+MODULE_AUTHOR("Ray Jui <rjui at broadcom.com>");
+MODULE_DESCRIPTION("Broadcom Cygnus GPIO Driver");
+MODULE_LICENSE("GPL v2");
--
1.7.9.5
More information about the linux-arm-kernel
mailing list