select PINMUX
select PINCONF
-config PINCTRL_CYGNUS_GPIO
- bool "Broadcom Cygnus GPIO (with PINCONF) driver"
- depends on OF_GPIO && ARCH_BCM_CYGNUS
+config PINCTRL_IPROC_GPIO
+ bool "Broadcom iProc GPIO (with PINCONF) driver"
+ depends on OF_GPIO && (ARCH_BCM_IPROC || COMPILE_TEST)
select GPIOLIB_IRQCHIP
select PINCONF
select GENERIC_PINCONF
- default ARCH_BCM_CYGNUS
+ default ARCH_BCM_IPROC
help
- Say yes here to enable the Broadcom Cygnus GPIO driver.
+ Say yes here to enable the Broadcom iProc GPIO driver.
+
+ The Broadcom iProc based SoCs- Cygnus, NS2, NSP and Stingray, use
+ same GPIO Controller IP hence this driver could be used for all.
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
+ The Broadcom NSP has two GPIO controllers including the ChipcommonA
+ GPIO, the ChipcommonB GPIO. Later controller is supported by this
+ driver.
+
+ The Broadcom NS2 has two GPIO controller including the CRMU GPIO,
+ the ChipcommonG GPIO. Both controllers are supported by this driver.
+
+ The Broadcom Stingray GPIO controllers are supported by this driver.
+
+ All above SoCs 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.
+ It provides the framework where pins from the individual GPIO can be
+ individually muxed to GPIO function, through interaction with the
+ SoCs IOMUX controller. This features could be used only on SoCs which
+ support individual pin muxing.
config PINCTRL_CYGNUS_MUX
bool "Broadcom Cygnus IOMUX driver"
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_IPROC_GPIO) += pinctrl-iproc-gpio.o
obj-$(CONFIG_PINCTRL_CYGNUS_MUX) += pinctrl-cygnus-mux.o
+++ /dev/null
-/*
- * 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 Iproc GPIO driver that supports 3
- * GPIO controllers on Iproc 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.
- *
- * It provides the functionality where pins from the GPIO can be
- * individually muxed to GPIO function, if individual pad
- * configuration is supported, through the interaction with respective
- * SoCs IOMUX controller.
- */
-
-#include <linux/kernel.h>
-#include <linux/slab.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/pinconf.h>
-#include <linux/pinctrl/pinconf-generic.h>
-
-#include "../pinctrl-utils.h"
-
-#define IPROC_GPIO_DATA_IN_OFFSET 0x00
-#define IPROC_GPIO_DATA_OUT_OFFSET 0x04
-#define IPROC_GPIO_OUT_EN_OFFSET 0x08
-#define IPROC_GPIO_INT_TYPE_OFFSET 0x0c
-#define IPROC_GPIO_INT_DE_OFFSET 0x10
-#define IPROC_GPIO_INT_EDGE_OFFSET 0x14
-#define IPROC_GPIO_INT_MSK_OFFSET 0x18
-#define IPROC_GPIO_INT_STAT_OFFSET 0x1c
-#define IPROC_GPIO_INT_MSTAT_OFFSET 0x20
-#define IPROC_GPIO_INT_CLR_OFFSET 0x24
-#define IPROC_GPIO_PAD_RES_OFFSET 0x34
-#define IPROC_GPIO_RES_EN_OFFSET 0x38
-
-/* drive strength control for ASIU GPIO */
-#define IPROC_GPIO_ASIU_DRV0_CTRL_OFFSET 0x58
-
-/* drive strength control for CCM/CRMU (AON) GPIO */
-#define IPROC_GPIO_DRV0_CTRL_OFFSET 0x00
-
-#define GPIO_BANK_SIZE 0x200
-#define NGPIOS_PER_BANK 32
-#define GPIO_BANK(pin) ((pin) / NGPIOS_PER_BANK)
-
-#define IPROC_GPIO_REG(pin, reg) (GPIO_BANK(pin) * GPIO_BANK_SIZE + (reg))
-#define IPROC_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)
-
-/*
- * Iproc GPIO core
- *
- * @dev: pointer to device
- * @base: I/O register base for Iproc GPIO controller
- * @io_ctrl: I/O register base for certain type of Iproc 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
- */
-struct iproc_gpio {
- struct device *dev;
-
- void __iomem *base;
- void __iomem *io_ctrl;
-
- spinlock_t lock;
-
- struct gpio_chip gc;
- unsigned num_banks;
-
- bool pinmux_is_supported;
-
- struct pinctrl_dev *pctl;
- struct pinctrl_desc pctldesc;
-};
-
-static inline struct iproc_gpio *to_iproc_gpio(struct gpio_chip *gc)
-{
- return container_of(gc, struct iproc_gpio, gc);
-}
-
-/*
- * Mapping from PINCONF pins to GPIO pins is 1-to-1
- */
-static inline unsigned iproc_pin_to_gpio(unsigned pin)
-{
- return pin;
-}
-
-/**
- * iproc_set_bit - set or clear one bit (corresponding to the GPIO pin) in a
- * Iproc GPIO register
- *
- * @iproc_gpio: Iproc GPIO device
- * @reg: register offset
- * @gpio: GPIO pin
- * @set: set or clear
- */
-static inline void iproc_set_bit(struct iproc_gpio *chip, unsigned int reg,
- unsigned gpio, bool set)
-{
- unsigned int offset = IPROC_GPIO_REG(gpio, reg);
- unsigned int shift = IPROC_GPIO_SHIFT(gpio);
- u32 val;
-
- val = readl(chip->base + offset);
- if (set)
- val |= BIT(shift);
- else
- val &= ~BIT(shift);
- writel(val, chip->base + offset);
-}
-
-static inline bool iproc_get_bit(struct iproc_gpio *chip, unsigned int reg,
- unsigned gpio)
-{
- unsigned int offset = IPROC_GPIO_REG(gpio, reg);
- unsigned int shift = IPROC_GPIO_SHIFT(gpio);
-
- return !!(readl(chip->base + offset) & BIT(shift));
-}
-
-static void iproc_gpio_irq_handler(struct irq_desc *desc)
-{
- struct gpio_chip *gc = irq_desc_get_handler_data(desc);
- struct iproc_gpio *chip = to_iproc_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 = readl(chip->base + (i * GPIO_BANK_SIZE) +
- IPROC_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
- */
- writel(BIT(bit), chip->base + (i * GPIO_BANK_SIZE) +
- IPROC_GPIO_INT_CLR_OFFSET);
-
- generic_handle_irq(child_irq);
- }
- }
-
- chained_irq_exit(irq_chip, desc);
-}
-
-
-static void iproc_gpio_irq_ack(struct irq_data *d)
-{
- struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
- struct iproc_gpio *chip = to_iproc_gpio(gc);
- unsigned gpio = d->hwirq;
- unsigned int offset = IPROC_GPIO_REG(gpio,
- IPROC_GPIO_INT_CLR_OFFSET);
- unsigned int shift = IPROC_GPIO_SHIFT(gpio);
- u32 val = BIT(shift);
-
- writel(val, chip->base + offset);
-}
-
-/**
- * iproc_gpio_irq_set_mask - mask/unmask a GPIO interrupt
- *
- * @d: IRQ chip data
- * @unmask: mask/unmask GPIO interrupt
- */
-static void iproc_gpio_irq_set_mask(struct irq_data *d, bool unmask)
-{
- struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
- struct iproc_gpio *chip = to_iproc_gpio(gc);
- unsigned gpio = d->hwirq;
-
- iproc_set_bit(chip, IPROC_GPIO_INT_MSK_OFFSET, gpio, unmask);
-}
-
-static void iproc_gpio_irq_mask(struct irq_data *d)
-{
- struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
- struct iproc_gpio *chip = to_iproc_gpio(gc);
- unsigned long flags;
-
- spin_lock_irqsave(&chip->lock, flags);
- iproc_gpio_irq_set_mask(d, false);
- spin_unlock_irqrestore(&chip->lock, flags);
-}
-
-static void iproc_gpio_irq_unmask(struct irq_data *d)
-{
- struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
- struct iproc_gpio *chip = to_iproc_gpio(gc);
- unsigned long flags;
-
- spin_lock_irqsave(&chip->lock, flags);
- iproc_gpio_irq_set_mask(d, true);
- spin_unlock_irqrestore(&chip->lock, flags);
-}
-
-static int iproc_gpio_irq_set_type(struct irq_data *d, unsigned int type)
-{
- struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
- struct iproc_gpio *chip = to_iproc_gpio(gc);
- unsigned gpio = d->hwirq;
- bool level_triggered = false;
- bool dual_edge = false;
- bool rising_or_high = false;
- unsigned long flags;
-
- switch (type & IRQ_TYPE_SENSE_MASK) {
- case IRQ_TYPE_EDGE_RISING:
- rising_or_high = true;
- break;
-
- case IRQ_TYPE_EDGE_FALLING:
- break;
-
- case IRQ_TYPE_EDGE_BOTH:
- dual_edge = true;
- break;
-
- case IRQ_TYPE_LEVEL_HIGH:
- level_triggered = true;
- rising_or_high = true;
- break;
-
- case IRQ_TYPE_LEVEL_LOW:
- level_triggered = true;
- break;
-
- default:
- dev_err(chip->dev, "invalid GPIO IRQ type 0x%x\n",
- type);
- return -EINVAL;
- }
-
- spin_lock_irqsave(&chip->lock, flags);
- iproc_set_bit(chip, IPROC_GPIO_INT_TYPE_OFFSET, gpio,
- level_triggered);
- iproc_set_bit(chip, IPROC_GPIO_INT_DE_OFFSET, gpio, dual_edge);
- iproc_set_bit(chip, IPROC_GPIO_INT_EDGE_OFFSET, gpio,
- rising_or_high);
- spin_unlock_irqrestore(&chip->lock, flags);
-
- dev_dbg(chip->dev,
- "gpio:%u level_triggered:%d dual_edge:%d rising_or_high:%d\n",
- gpio, level_triggered, dual_edge, rising_or_high);
-
- return 0;
-}
-
-static struct irq_chip iproc_gpio_irq_chip = {
- .name = "bcm-iproc-gpio",
- .irq_ack = iproc_gpio_irq_ack,
- .irq_mask = iproc_gpio_irq_mask,
- .irq_unmask = iproc_gpio_irq_unmask,
- .irq_set_type = iproc_gpio_irq_set_type,
-};
-
-/*
- * Request the Iproc IOMUX pinmux controller to mux individual pins to GPIO
- */
-static int iproc_gpio_request(struct gpio_chip *gc, unsigned offset)
-{
- struct iproc_gpio *chip = to_iproc_gpio(gc);
- unsigned gpio = gc->base + offset;
-
- /* not all Iproc GPIO pins can be muxed individually */
- if (!chip->pinmux_is_supported)
- return 0;
-
- return pinctrl_request_gpio(gpio);
-}
-
-static void iproc_gpio_free(struct gpio_chip *gc, unsigned offset)
-{
- struct iproc_gpio *chip = to_iproc_gpio(gc);
- unsigned gpio = gc->base + offset;
-
- if (!chip->pinmux_is_supported)
- return;
-
- pinctrl_free_gpio(gpio);
-}
-
-static int iproc_gpio_direction_input(struct gpio_chip *gc, unsigned gpio)
-{
- struct iproc_gpio *chip = to_iproc_gpio(gc);
- unsigned long flags;
-
- spin_lock_irqsave(&chip->lock, flags);
- iproc_set_bit(chip, IPROC_GPIO_OUT_EN_OFFSET, gpio, false);
- spin_unlock_irqrestore(&chip->lock, flags);
-
- dev_dbg(chip->dev, "gpio:%u set input\n", gpio);
-
- return 0;
-}
-
-static int iproc_gpio_direction_output(struct gpio_chip *gc, unsigned gpio,
- int val)
-{
- struct iproc_gpio *chip = to_iproc_gpio(gc);
- unsigned long flags;
-
- spin_lock_irqsave(&chip->lock, flags);
- iproc_set_bit(chip, IPROC_GPIO_OUT_EN_OFFSET, gpio, true);
- iproc_set_bit(chip, IPROC_GPIO_DATA_OUT_OFFSET, gpio, !!(val));
- spin_unlock_irqrestore(&chip->lock, flags);
-
- dev_dbg(chip->dev, "gpio:%u set output, value:%d\n", gpio, val);
-
- return 0;
-}
-
-static void iproc_gpio_set(struct gpio_chip *gc, unsigned gpio, int val)
-{
- struct iproc_gpio *chip = to_iproc_gpio(gc);
- unsigned long flags;
-
- spin_lock_irqsave(&chip->lock, flags);
- iproc_set_bit(chip, IPROC_GPIO_DATA_OUT_OFFSET, gpio, !!(val));
- spin_unlock_irqrestore(&chip->lock, flags);
-
- dev_dbg(chip->dev, "gpio:%u set, value:%d\n", gpio, val);
-}
-
-static int iproc_gpio_get(struct gpio_chip *gc, unsigned gpio)
-{
- struct iproc_gpio *chip = to_iproc_gpio(gc);
- unsigned int offset = IPROC_GPIO_REG(gpio,
- IPROC_GPIO_DATA_IN_OFFSET);
- unsigned int shift = IPROC_GPIO_SHIFT(gpio);
-
- return !!(readl(chip->base + offset) & BIT(shift));
-}
-
-static int iproc_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 *iproc_get_group_name(struct pinctrl_dev *pctldev,
- unsigned selector)
-{
- return "gpio_grp";
-}
-
-static const struct pinctrl_ops iproc_pctrl_ops = {
- .get_groups_count = iproc_get_groups_count,
- .get_group_name = iproc_get_group_name,
- .dt_node_to_map = pinconf_generic_dt_node_to_map_pin,
- .dt_free_map = pinctrl_utils_dt_free_map,
-};
-
-static int iproc_gpio_set_pull(struct iproc_gpio *chip, unsigned gpio,
- bool disable, bool pull_up)
-{
- unsigned long flags;
-
- spin_lock_irqsave(&chip->lock, flags);
-
- if (disable) {
- iproc_set_bit(chip, IPROC_GPIO_RES_EN_OFFSET, gpio, false);
- } else {
- iproc_set_bit(chip, IPROC_GPIO_PAD_RES_OFFSET, gpio,
- pull_up);
- iproc_set_bit(chip, IPROC_GPIO_RES_EN_OFFSET, gpio, true);
- }
-
- spin_unlock_irqrestore(&chip->lock, flags);
-
- dev_dbg(chip->dev, "gpio:%u set pullup:%d\n", gpio, pull_up);
-
- return 0;
-}
-
-static void iproc_gpio_get_pull(struct iproc_gpio *chip, unsigned gpio,
- bool *disable, bool *pull_up)
-{
- unsigned long flags;
-
- spin_lock_irqsave(&chip->lock, flags);
- *disable = !iproc_get_bit(chip, IPROC_GPIO_RES_EN_OFFSET, gpio);
- *pull_up = iproc_get_bit(chip, IPROC_GPIO_PAD_RES_OFFSET, gpio);
- spin_unlock_irqrestore(&chip->lock, flags);
-}
-
-static int iproc_gpio_set_strength(struct iproc_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 = IPROC_GPIO_DRV0_CTRL_OFFSET;
- } else {
- base = chip->base;
- offset = IPROC_GPIO_REG(gpio,
- IPROC_GPIO_ASIU_DRV0_CTRL_OFFSET);
- }
-
- shift = IPROC_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 iproc_gpio_get_strength(struct iproc_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 = IPROC_GPIO_DRV0_CTRL_OFFSET;
- } else {
- base = chip->base;
- offset = IPROC_GPIO_REG(gpio,
- IPROC_GPIO_ASIU_DRV0_CTRL_OFFSET);
- }
-
- shift = IPROC_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 iproc_pin_config_get(struct pinctrl_dev *pctldev, unsigned pin,
- unsigned long *config)
-{
- struct iproc_gpio *chip = pinctrl_dev_get_drvdata(pctldev);
- enum pin_config_param param = pinconf_to_config_param(*config);
- unsigned gpio = iproc_pin_to_gpio(pin);
- u16 arg;
- bool disable, pull_up;
- int ret;
-
- switch (param) {
- case PIN_CONFIG_BIAS_DISABLE:
- iproc_gpio_get_pull(chip, gpio, &disable, &pull_up);
- if (disable)
- return 0;
- else
- return -EINVAL;
-
- case PIN_CONFIG_BIAS_PULL_UP:
- iproc_gpio_get_pull(chip, gpio, &disable, &pull_up);
- if (!disable && pull_up)
- return 0;
- else
- return -EINVAL;
-
- case PIN_CONFIG_BIAS_PULL_DOWN:
- iproc_gpio_get_pull(chip, gpio, &disable, &pull_up);
- if (!disable && !pull_up)
- return 0;
- else
- return -EINVAL;
-
- case PIN_CONFIG_DRIVE_STRENGTH:
- ret = iproc_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 iproc_pin_config_set(struct pinctrl_dev *pctldev, unsigned pin,
- unsigned long *configs, unsigned num_configs)
-{
- struct iproc_gpio *chip = pinctrl_dev_get_drvdata(pctldev);
- enum pin_config_param param;
- u16 arg;
- unsigned i, gpio = iproc_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 = iproc_gpio_set_pull(chip, gpio, true, false);
- if (ret < 0)
- goto out;
- break;
-
- case PIN_CONFIG_BIAS_PULL_UP:
- ret = iproc_gpio_set_pull(chip, gpio, false, true);
- if (ret < 0)
- goto out;
- break;
-
- case PIN_CONFIG_BIAS_PULL_DOWN:
- ret = iproc_gpio_set_pull(chip, gpio, false, false);
- if (ret < 0)
- goto out;
- break;
-
- case PIN_CONFIG_DRIVE_STRENGTH:
- ret = iproc_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 iproc_pconf_ops = {
- .is_generic = true,
- .pin_config_get = iproc_pin_config_get,
- .pin_config_set = iproc_pin_config_set,
-};
-
-/*
- * Iproc 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 iproc_gpio_register_pinconf(struct iproc_gpio *chip)
-{
- struct pinctrl_desc *pctldesc = &chip->pctldesc;
- struct pinctrl_pin_desc *pins;
- struct gpio_chip *gc = &chip->gc;
- int i;
-
- pins = devm_kcalloc(chip->dev, gc->ngpio, sizeof(*pins), GFP_KERNEL);
- if (!pins)
- return -ENOMEM;
-
- for (i = 0; i < gc->ngpio; i++) {
- pins[i].number = i;
- pins[i].name = devm_kasprintf(chip->dev, GFP_KERNEL,
- "gpio-%d", i);
- if (!pins[i].name)
- return -ENOMEM;
- }
-
- pctldesc->name = dev_name(chip->dev);
- pctldesc->pctlops = &iproc_pctrl_ops;
- pctldesc->pins = pins;
- pctldesc->npins = gc->ngpio;
- pctldesc->confops = &iproc_pconf_ops;
-
- chip->pctl = pinctrl_register(pctldesc, chip->dev, chip);
- if (IS_ERR(chip->pctl)) {
- dev_err(chip->dev, "unable to register pinctrl device\n");
- return PTR_ERR(chip->pctl);
- }
-
- return 0;
-}
-
-static void iproc_gpio_unregister_pinconf(struct cygnus_gpio *chip)
-{
- pinctrl_unregister(chip->pctl);
-}
-
-static const struct of_device_id iproc_gpio_of_match[] = {
- { .compatible = "brcm,cygnus-ccm-gpio" },
- { .compatible = "brcm,cygnus-asiu-gpio" },
- { .compatible = "brcm,cygnus-crmu-gpio" },
- { .compatible = "brcm,iproc-gpio" },
- { }
-};
-
-static int iproc_gpio_probe(struct platform_device *pdev)
-{
- struct device *dev = &pdev->dev;
- struct resource *res;
- struct iproc_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);
-
- 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);
- }
- }
-
- if (of_property_read_u32(dev->of_node, "ngpios", &ngpios)) {
- dev_err(&pdev->dev, "missing ngpios DT property\n");
- return -ENODEV;
- }
-
- spin_lock_init(&chip->lock);
-
- gc = &chip->gc;
- gc->base = -1;
- gc->ngpio = ngpios;
- chip->num_banks = (ngpios + NGPIOS_PER_BANK - 1) / NGPIOS_PER_BANK;
- gc->label = dev_name(dev);
- gc->dev = dev;
- gc->of_node = dev->of_node;
- gc->request = iproc_gpio_request;
- gc->free = iproc_gpio_free;
- gc->direction_input = iproc_gpio_direction_input;
- gc->direction_output = iproc_gpio_direction_output;
- gc->set = iproc_gpio_set;
- gc->get = iproc_gpio_get;
-
- chip->pinmux_is_supported = of_property_read_bool(dev->of_node,
- "gpio-ranges");
-
- ret = gpiochip_add(gc);
- if (ret < 0) {
- dev_err(dev, "unable to add GPIO chip\n");
- return ret;
- }
-
- ret = iproc_gpio_register_pinconf(chip);
- if (ret) {
- dev_err(dev, "unable to register pinconf\n");
- goto err_rm_gpiochip;
- }
-
- /* optional GPIO interrupt support */
- irq = platform_get_irq(pdev, 0);
- if (irq) {
- ret = gpiochip_irqchip_add(gc, &iproc_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, &iproc_gpio_irq_chip, irq,
- iproc_gpio_irq_handler);
- }
-
- return 0;
-
-err_unregister_pinconf:
- iproc_gpio_unregister_pinconf(chip);
-
-err_rm_gpiochip:
- gpiochip_remove(gc);
-
- return ret;
-}
-
-static struct platform_driver iproc_gpio_driver = {
- .driver = {
- .name = "iproc-gpio",
- .of_match_table = iproc_gpio_of_match,
- },
- .probe = iproc_gpio_probe,
-};
-
-static int __init iproc_gpio_init(void)
-{
- return platform_driver_probe(&iproc_gpio_driver, iproc_gpio_probe);
-}
-arch_initcall_sync(iproc_gpio_init);
--- /dev/null
+/*
+ * 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 Iproc GPIO driver that supports 3
+ * GPIO controllers on Iproc 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.
+ *
+ * It provides the functionality where pins from the GPIO can be
+ * individually muxed to GPIO function, if individual pad
+ * configuration is supported, through the interaction with respective
+ * SoCs IOMUX controller.
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.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/pinconf.h>
+#include <linux/pinctrl/pinconf-generic.h>
+
+#include "../pinctrl-utils.h"
+
+#define IPROC_GPIO_DATA_IN_OFFSET 0x00
+#define IPROC_GPIO_DATA_OUT_OFFSET 0x04
+#define IPROC_GPIO_OUT_EN_OFFSET 0x08
+#define IPROC_GPIO_INT_TYPE_OFFSET 0x0c
+#define IPROC_GPIO_INT_DE_OFFSET 0x10
+#define IPROC_GPIO_INT_EDGE_OFFSET 0x14
+#define IPROC_GPIO_INT_MSK_OFFSET 0x18
+#define IPROC_GPIO_INT_STAT_OFFSET 0x1c
+#define IPROC_GPIO_INT_MSTAT_OFFSET 0x20
+#define IPROC_GPIO_INT_CLR_OFFSET 0x24
+#define IPROC_GPIO_PAD_RES_OFFSET 0x34
+#define IPROC_GPIO_RES_EN_OFFSET 0x38
+
+/* drive strength control for ASIU GPIO */
+#define IPROC_GPIO_ASIU_DRV0_CTRL_OFFSET 0x58
+
+/* drive strength control for CCM/CRMU (AON) GPIO */
+#define IPROC_GPIO_DRV0_CTRL_OFFSET 0x00
+
+#define GPIO_BANK_SIZE 0x200
+#define NGPIOS_PER_BANK 32
+#define GPIO_BANK(pin) ((pin) / NGPIOS_PER_BANK)
+
+#define IPROC_GPIO_REG(pin, reg) (GPIO_BANK(pin) * GPIO_BANK_SIZE + (reg))
+#define IPROC_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)
+
+/*
+ * Iproc GPIO core
+ *
+ * @dev: pointer to device
+ * @base: I/O register base for Iproc GPIO controller
+ * @io_ctrl: I/O register base for certain type of Iproc 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
+ */
+struct iproc_gpio {
+ struct device *dev;
+
+ void __iomem *base;
+ void __iomem *io_ctrl;
+
+ spinlock_t lock;
+
+ struct gpio_chip gc;
+ unsigned num_banks;
+
+ bool pinmux_is_supported;
+
+ struct pinctrl_dev *pctl;
+ struct pinctrl_desc pctldesc;
+};
+
+static inline struct iproc_gpio *to_iproc_gpio(struct gpio_chip *gc)
+{
+ return container_of(gc, struct iproc_gpio, gc);
+}
+
+/*
+ * Mapping from PINCONF pins to GPIO pins is 1-to-1
+ */
+static inline unsigned iproc_pin_to_gpio(unsigned pin)
+{
+ return pin;
+}
+
+/**
+ * iproc_set_bit - set or clear one bit (corresponding to the GPIO pin) in a
+ * Iproc GPIO register
+ *
+ * @iproc_gpio: Iproc GPIO device
+ * @reg: register offset
+ * @gpio: GPIO pin
+ * @set: set or clear
+ */
+static inline void iproc_set_bit(struct iproc_gpio *chip, unsigned int reg,
+ unsigned gpio, bool set)
+{
+ unsigned int offset = IPROC_GPIO_REG(gpio, reg);
+ unsigned int shift = IPROC_GPIO_SHIFT(gpio);
+ u32 val;
+
+ val = readl(chip->base + offset);
+ if (set)
+ val |= BIT(shift);
+ else
+ val &= ~BIT(shift);
+ writel(val, chip->base + offset);
+}
+
+static inline bool iproc_get_bit(struct iproc_gpio *chip, unsigned int reg,
+ unsigned gpio)
+{
+ unsigned int offset = IPROC_GPIO_REG(gpio, reg);
+ unsigned int shift = IPROC_GPIO_SHIFT(gpio);
+
+ return !!(readl(chip->base + offset) & BIT(shift));
+}
+
+static void iproc_gpio_irq_handler(struct irq_desc *desc)
+{
+ struct gpio_chip *gc = irq_desc_get_handler_data(desc);
+ struct iproc_gpio *chip = to_iproc_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 = readl(chip->base + (i * GPIO_BANK_SIZE) +
+ IPROC_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
+ */
+ writel(BIT(bit), chip->base + (i * GPIO_BANK_SIZE) +
+ IPROC_GPIO_INT_CLR_OFFSET);
+
+ generic_handle_irq(child_irq);
+ }
+ }
+
+ chained_irq_exit(irq_chip, desc);
+}
+
+
+static void iproc_gpio_irq_ack(struct irq_data *d)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct iproc_gpio *chip = to_iproc_gpio(gc);
+ unsigned gpio = d->hwirq;
+ unsigned int offset = IPROC_GPIO_REG(gpio,
+ IPROC_GPIO_INT_CLR_OFFSET);
+ unsigned int shift = IPROC_GPIO_SHIFT(gpio);
+ u32 val = BIT(shift);
+
+ writel(val, chip->base + offset);
+}
+
+/**
+ * iproc_gpio_irq_set_mask - mask/unmask a GPIO interrupt
+ *
+ * @d: IRQ chip data
+ * @unmask: mask/unmask GPIO interrupt
+ */
+static void iproc_gpio_irq_set_mask(struct irq_data *d, bool unmask)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct iproc_gpio *chip = to_iproc_gpio(gc);
+ unsigned gpio = d->hwirq;
+
+ iproc_set_bit(chip, IPROC_GPIO_INT_MSK_OFFSET, gpio, unmask);
+}
+
+static void iproc_gpio_irq_mask(struct irq_data *d)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct iproc_gpio *chip = to_iproc_gpio(gc);
+ unsigned long flags;
+
+ spin_lock_irqsave(&chip->lock, flags);
+ iproc_gpio_irq_set_mask(d, false);
+ spin_unlock_irqrestore(&chip->lock, flags);
+}
+
+static void iproc_gpio_irq_unmask(struct irq_data *d)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct iproc_gpio *chip = to_iproc_gpio(gc);
+ unsigned long flags;
+
+ spin_lock_irqsave(&chip->lock, flags);
+ iproc_gpio_irq_set_mask(d, true);
+ spin_unlock_irqrestore(&chip->lock, flags);
+}
+
+static int iproc_gpio_irq_set_type(struct irq_data *d, unsigned int type)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct iproc_gpio *chip = to_iproc_gpio(gc);
+ unsigned gpio = d->hwirq;
+ bool level_triggered = false;
+ bool dual_edge = false;
+ bool rising_or_high = false;
+ unsigned long flags;
+
+ switch (type & IRQ_TYPE_SENSE_MASK) {
+ case IRQ_TYPE_EDGE_RISING:
+ rising_or_high = true;
+ break;
+
+ case IRQ_TYPE_EDGE_FALLING:
+ break;
+
+ case IRQ_TYPE_EDGE_BOTH:
+ dual_edge = true;
+ break;
+
+ case IRQ_TYPE_LEVEL_HIGH:
+ level_triggered = true;
+ rising_or_high = true;
+ break;
+
+ case IRQ_TYPE_LEVEL_LOW:
+ level_triggered = true;
+ break;
+
+ default:
+ dev_err(chip->dev, "invalid GPIO IRQ type 0x%x\n",
+ type);
+ return -EINVAL;
+ }
+
+ spin_lock_irqsave(&chip->lock, flags);
+ iproc_set_bit(chip, IPROC_GPIO_INT_TYPE_OFFSET, gpio,
+ level_triggered);
+ iproc_set_bit(chip, IPROC_GPIO_INT_DE_OFFSET, gpio, dual_edge);
+ iproc_set_bit(chip, IPROC_GPIO_INT_EDGE_OFFSET, gpio,
+ rising_or_high);
+ spin_unlock_irqrestore(&chip->lock, flags);
+
+ dev_dbg(chip->dev,
+ "gpio:%u level_triggered:%d dual_edge:%d rising_or_high:%d\n",
+ gpio, level_triggered, dual_edge, rising_or_high);
+
+ return 0;
+}
+
+static struct irq_chip iproc_gpio_irq_chip = {
+ .name = "bcm-iproc-gpio",
+ .irq_ack = iproc_gpio_irq_ack,
+ .irq_mask = iproc_gpio_irq_mask,
+ .irq_unmask = iproc_gpio_irq_unmask,
+ .irq_set_type = iproc_gpio_irq_set_type,
+};
+
+/*
+ * Request the Iproc IOMUX pinmux controller to mux individual pins to GPIO
+ */
+static int iproc_gpio_request(struct gpio_chip *gc, unsigned offset)
+{
+ struct iproc_gpio *chip = to_iproc_gpio(gc);
+ unsigned gpio = gc->base + offset;
+
+ /* not all Iproc GPIO pins can be muxed individually */
+ if (!chip->pinmux_is_supported)
+ return 0;
+
+ return pinctrl_request_gpio(gpio);
+}
+
+static void iproc_gpio_free(struct gpio_chip *gc, unsigned offset)
+{
+ struct iproc_gpio *chip = to_iproc_gpio(gc);
+ unsigned gpio = gc->base + offset;
+
+ if (!chip->pinmux_is_supported)
+ return;
+
+ pinctrl_free_gpio(gpio);
+}
+
+static int iproc_gpio_direction_input(struct gpio_chip *gc, unsigned gpio)
+{
+ struct iproc_gpio *chip = to_iproc_gpio(gc);
+ unsigned long flags;
+
+ spin_lock_irqsave(&chip->lock, flags);
+ iproc_set_bit(chip, IPROC_GPIO_OUT_EN_OFFSET, gpio, false);
+ spin_unlock_irqrestore(&chip->lock, flags);
+
+ dev_dbg(chip->dev, "gpio:%u set input\n", gpio);
+
+ return 0;
+}
+
+static int iproc_gpio_direction_output(struct gpio_chip *gc, unsigned gpio,
+ int val)
+{
+ struct iproc_gpio *chip = to_iproc_gpio(gc);
+ unsigned long flags;
+
+ spin_lock_irqsave(&chip->lock, flags);
+ iproc_set_bit(chip, IPROC_GPIO_OUT_EN_OFFSET, gpio, true);
+ iproc_set_bit(chip, IPROC_GPIO_DATA_OUT_OFFSET, gpio, !!(val));
+ spin_unlock_irqrestore(&chip->lock, flags);
+
+ dev_dbg(chip->dev, "gpio:%u set output, value:%d\n", gpio, val);
+
+ return 0;
+}
+
+static void iproc_gpio_set(struct gpio_chip *gc, unsigned gpio, int val)
+{
+ struct iproc_gpio *chip = to_iproc_gpio(gc);
+ unsigned long flags;
+
+ spin_lock_irqsave(&chip->lock, flags);
+ iproc_set_bit(chip, IPROC_GPIO_DATA_OUT_OFFSET, gpio, !!(val));
+ spin_unlock_irqrestore(&chip->lock, flags);
+
+ dev_dbg(chip->dev, "gpio:%u set, value:%d\n", gpio, val);
+}
+
+static int iproc_gpio_get(struct gpio_chip *gc, unsigned gpio)
+{
+ struct iproc_gpio *chip = to_iproc_gpio(gc);
+ unsigned int offset = IPROC_GPIO_REG(gpio,
+ IPROC_GPIO_DATA_IN_OFFSET);
+ unsigned int shift = IPROC_GPIO_SHIFT(gpio);
+
+ return !!(readl(chip->base + offset) & BIT(shift));
+}
+
+static int iproc_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 *iproc_get_group_name(struct pinctrl_dev *pctldev,
+ unsigned selector)
+{
+ return "gpio_grp";
+}
+
+static const struct pinctrl_ops iproc_pctrl_ops = {
+ .get_groups_count = iproc_get_groups_count,
+ .get_group_name = iproc_get_group_name,
+ .dt_node_to_map = pinconf_generic_dt_node_to_map_pin,
+ .dt_free_map = pinctrl_utils_dt_free_map,
+};
+
+static int iproc_gpio_set_pull(struct iproc_gpio *chip, unsigned gpio,
+ bool disable, bool pull_up)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&chip->lock, flags);
+
+ if (disable) {
+ iproc_set_bit(chip, IPROC_GPIO_RES_EN_OFFSET, gpio, false);
+ } else {
+ iproc_set_bit(chip, IPROC_GPIO_PAD_RES_OFFSET, gpio,
+ pull_up);
+ iproc_set_bit(chip, IPROC_GPIO_RES_EN_OFFSET, gpio, true);
+ }
+
+ spin_unlock_irqrestore(&chip->lock, flags);
+
+ dev_dbg(chip->dev, "gpio:%u set pullup:%d\n", gpio, pull_up);
+
+ return 0;
+}
+
+static void iproc_gpio_get_pull(struct iproc_gpio *chip, unsigned gpio,
+ bool *disable, bool *pull_up)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&chip->lock, flags);
+ *disable = !iproc_get_bit(chip, IPROC_GPIO_RES_EN_OFFSET, gpio);
+ *pull_up = iproc_get_bit(chip, IPROC_GPIO_PAD_RES_OFFSET, gpio);
+ spin_unlock_irqrestore(&chip->lock, flags);
+}
+
+static int iproc_gpio_set_strength(struct iproc_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 = IPROC_GPIO_DRV0_CTRL_OFFSET;
+ } else {
+ base = chip->base;
+ offset = IPROC_GPIO_REG(gpio,
+ IPROC_GPIO_ASIU_DRV0_CTRL_OFFSET);
+ }
+
+ shift = IPROC_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 iproc_gpio_get_strength(struct iproc_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 = IPROC_GPIO_DRV0_CTRL_OFFSET;
+ } else {
+ base = chip->base;
+ offset = IPROC_GPIO_REG(gpio,
+ IPROC_GPIO_ASIU_DRV0_CTRL_OFFSET);
+ }
+
+ shift = IPROC_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 iproc_pin_config_get(struct pinctrl_dev *pctldev, unsigned pin,
+ unsigned long *config)
+{
+ struct iproc_gpio *chip = pinctrl_dev_get_drvdata(pctldev);
+ enum pin_config_param param = pinconf_to_config_param(*config);
+ unsigned gpio = iproc_pin_to_gpio(pin);
+ u16 arg;
+ bool disable, pull_up;
+ int ret;
+
+ switch (param) {
+ case PIN_CONFIG_BIAS_DISABLE:
+ iproc_gpio_get_pull(chip, gpio, &disable, &pull_up);
+ if (disable)
+ return 0;
+ else
+ return -EINVAL;
+
+ case PIN_CONFIG_BIAS_PULL_UP:
+ iproc_gpio_get_pull(chip, gpio, &disable, &pull_up);
+ if (!disable && pull_up)
+ return 0;
+ else
+ return -EINVAL;
+
+ case PIN_CONFIG_BIAS_PULL_DOWN:
+ iproc_gpio_get_pull(chip, gpio, &disable, &pull_up);
+ if (!disable && !pull_up)
+ return 0;
+ else
+ return -EINVAL;
+
+ case PIN_CONFIG_DRIVE_STRENGTH:
+ ret = iproc_gpio_get_strength(chip, gpio, &arg);
+ if (ret)
+ return ret;
+ *config = pinconf_to_config_packed(param, arg);
+
+ return 0;
+
+ default:
+ return -ENOTSUPP;
+ }
+
+ return -ENOTSUPP;
+}
+
+static int iproc_pin_config_set(struct pinctrl_dev *pctldev, unsigned pin,
+ unsigned long *configs, unsigned num_configs)
+{
+ struct iproc_gpio *chip = pinctrl_dev_get_drvdata(pctldev);
+ enum pin_config_param param;
+ u16 arg;
+ unsigned i, gpio = iproc_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 = iproc_gpio_set_pull(chip, gpio, true, false);
+ if (ret < 0)
+ goto out;
+ break;
+
+ case PIN_CONFIG_BIAS_PULL_UP:
+ ret = iproc_gpio_set_pull(chip, gpio, false, true);
+ if (ret < 0)
+ goto out;
+ break;
+
+ case PIN_CONFIG_BIAS_PULL_DOWN:
+ ret = iproc_gpio_set_pull(chip, gpio, false, false);
+ if (ret < 0)
+ goto out;
+ break;
+
+ case PIN_CONFIG_DRIVE_STRENGTH:
+ ret = iproc_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 iproc_pconf_ops = {
+ .is_generic = true,
+ .pin_config_get = iproc_pin_config_get,
+ .pin_config_set = iproc_pin_config_set,
+};
+
+/*
+ * Iproc 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 iproc_gpio_register_pinconf(struct iproc_gpio *chip)
+{
+ struct pinctrl_desc *pctldesc = &chip->pctldesc;
+ struct pinctrl_pin_desc *pins;
+ struct gpio_chip *gc = &chip->gc;
+ int i;
+
+ pins = devm_kcalloc(chip->dev, gc->ngpio, sizeof(*pins), GFP_KERNEL);
+ if (!pins)
+ return -ENOMEM;
+
+ for (i = 0; i < gc->ngpio; i++) {
+ pins[i].number = i;
+ pins[i].name = devm_kasprintf(chip->dev, GFP_KERNEL,
+ "gpio-%d", i);
+ if (!pins[i].name)
+ return -ENOMEM;
+ }
+
+ pctldesc->name = dev_name(chip->dev);
+ pctldesc->pctlops = &iproc_pctrl_ops;
+ pctldesc->pins = pins;
+ pctldesc->npins = gc->ngpio;
+ pctldesc->confops = &iproc_pconf_ops;
+
+ chip->pctl = pinctrl_register(pctldesc, chip->dev, chip);
+ if (IS_ERR(chip->pctl)) {
+ dev_err(chip->dev, "unable to register pinctrl device\n");
+ return PTR_ERR(chip->pctl);
+ }
+
+ return 0;
+}
+
+static void iproc_gpio_unregister_pinconf(struct cygnus_gpio *chip)
+{
+ pinctrl_unregister(chip->pctl);
+}
+
+static const struct of_device_id iproc_gpio_of_match[] = {
+ { .compatible = "brcm,cygnus-ccm-gpio" },
+ { .compatible = "brcm,cygnus-asiu-gpio" },
+ { .compatible = "brcm,cygnus-crmu-gpio" },
+ { .compatible = "brcm,iproc-gpio" },
+ { }
+};
+
+static int iproc_gpio_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct resource *res;
+ struct iproc_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);
+
+ 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);
+ }
+ }
+
+ if (of_property_read_u32(dev->of_node, "ngpios", &ngpios)) {
+ dev_err(&pdev->dev, "missing ngpios DT property\n");
+ return -ENODEV;
+ }
+
+ spin_lock_init(&chip->lock);
+
+ gc = &chip->gc;
+ gc->base = -1;
+ gc->ngpio = ngpios;
+ chip->num_banks = (ngpios + NGPIOS_PER_BANK - 1) / NGPIOS_PER_BANK;
+ gc->label = dev_name(dev);
+ gc->dev = dev;
+ gc->of_node = dev->of_node;
+ gc->request = iproc_gpio_request;
+ gc->free = iproc_gpio_free;
+ gc->direction_input = iproc_gpio_direction_input;
+ gc->direction_output = iproc_gpio_direction_output;
+ gc->set = iproc_gpio_set;
+ gc->get = iproc_gpio_get;
+
+ chip->pinmux_is_supported = of_property_read_bool(dev->of_node,
+ "gpio-ranges");
+
+ ret = gpiochip_add(gc);
+ if (ret < 0) {
+ dev_err(dev, "unable to add GPIO chip\n");
+ return ret;
+ }
+
+ ret = iproc_gpio_register_pinconf(chip);
+ if (ret) {
+ dev_err(dev, "unable to register pinconf\n");
+ goto err_rm_gpiochip;
+ }
+
+ /* optional GPIO interrupt support */
+ irq = platform_get_irq(pdev, 0);
+ if (irq) {
+ ret = gpiochip_irqchip_add(gc, &iproc_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, &iproc_gpio_irq_chip, irq,
+ iproc_gpio_irq_handler);
+ }
+
+ return 0;
+
+err_unregister_pinconf:
+ iproc_gpio_unregister_pinconf(chip);
+
+err_rm_gpiochip:
+ gpiochip_remove(gc);
+
+ return ret;
+}
+
+static struct platform_driver iproc_gpio_driver = {
+ .driver = {
+ .name = "iproc-gpio",
+ .of_match_table = iproc_gpio_of_match,
+ },
+ .probe = iproc_gpio_probe,
+};
+
+static int __init iproc_gpio_init(void)
+{
+ return platform_driver_probe(&iproc_gpio_driver, iproc_gpio_probe);
+}
+arch_initcall_sync(iproc_gpio_init);
projects / openwrt / staging / blogic.git / commitdiff