diff options
Diffstat (limited to 'meta-openbmc-mods/meta-common/recipes-kernel/linux/linux-aspeed/0041-Enable-passthrough-based-gpio-character-device.patch')
| -rw-r--r-- | meta-openbmc-mods/meta-common/recipes-kernel/linux/linux-aspeed/0041-Enable-passthrough-based-gpio-character-device.patch | 287 |
1 files changed, 287 insertions, 0 deletions
diff --git a/meta-openbmc-mods/meta-common/recipes-kernel/linux/linux-aspeed/0041-Enable-passthrough-based-gpio-character-device.patch b/meta-openbmc-mods/meta-common/recipes-kernel/linux/linux-aspeed/0041-Enable-passthrough-based-gpio-character-device.patch new file mode 100644 index 000000000..9e7757011 --- /dev/null +++ b/meta-openbmc-mods/meta-common/recipes-kernel/linux/linux-aspeed/0041-Enable-passthrough-based-gpio-character-device.patch @@ -0,0 +1,287 @@ +From d34efc982a9206db87da49be3d9b1e20f59be56f Mon Sep 17 00:00:00 2001 +From: Kuiying Wang <kuiying.wang@intel.com> +Date: Thu, 31 Jan 2019 17:47:39 +0800 +Subject: [PATCH] Enable passthrough based gpio character device. + +Signed-off-by: Kuiying Wang <kuiying.wang@intel.com> +--- + drivers/gpio/gpio-aspeed.c | 47 ++++++++++++++++++++++- + drivers/gpio/gpiolib.c | 51 +++++++++++++++++++++++-- + drivers/gpio/gpiolib.h | 1 + + include/linux/gpio/consumer.h | 9 +++++ + include/linux/pinctrl/pinconf-generic.h | 2 + + include/uapi/linux/gpio.h | 1 + + 6 files changed, 106 insertions(+), 5 deletions(-) + +diff --git a/drivers/gpio/gpio-aspeed.c b/drivers/gpio/gpio-aspeed.c +index 2342e154029b..06fd95197684 100644 +--- a/drivers/gpio/gpio-aspeed.c ++++ b/drivers/gpio/gpio-aspeed.c +@@ -17,9 +17,11 @@ + #include <linux/init.h> + #include <linux/io.h> + #include <linux/kernel.h> ++#include <linux/mfd/syscon.h> + #include <linux/module.h> + #include <linux/pinctrl/consumer.h> + #include <linux/platform_device.h> ++#include <linux/regmap.h> + #include <linux/spinlock.h> + #include <linux/string.h> + +@@ -58,6 +60,7 @@ struct aspeed_gpio { + struct gpio_chip chip; + spinlock_t lock; + void __iomem *base; ++ struct regmap *scu; + int irq; + const struct aspeed_gpio_config *config; + +@@ -91,6 +94,13 @@ struct aspeed_gpio_bank { + * and thus can be used to read back what was last written + * reliably. + */ ++#define SCU8C 0x8C /* Multi-function Pin Control #4 */ ++#define PASS_THROUGH1 32 ++#define PASS_THROUGH2 34 ++#define PASS_THROUGH2_MASK 0x2000 ++#define PASS_THROUGH1_MASK 0x1000 ++#define PASS_THROUGH2_ON 0x2000 ++#define PASS_THROUGH1_ON 0x1000 + + static const int debounce_timers[4] = { 0x00, 0x50, 0x54, 0x58 }; + +@@ -988,12 +998,38 @@ static int set_debounce(struct gpio_chip *chip, unsigned int offset, + return disable_debounce(chip, offset); + } + ++static int aspeed_gpio_pass_through(struct gpio_chip *chip, unsigned int offset, ++ unsigned long param) ++{ ++ struct aspeed_gpio *gpio = gpiochip_get_data(chip); ++ u32 value; ++ ++ if (!gpio->scu) ++ return -ENOTSUPP; ++ if (param == PIN_CONFIG_PASS_THROUGH_ENABLE){ ++ if (offset == PASS_THROUGH2){ ++ regmap_update_bits(gpio->scu, SCU8C, PASS_THROUGH2_MASK, PASS_THROUGH2_ON); ++ } else if (offset == PASS_THROUGH1){ ++ regmap_update_bits(gpio->scu, SCU8C, PASS_THROUGH1_MASK, PASS_THROUGH1_ON); ++ } ++ } else if (param == PIN_CONFIG_PASS_THROUGH_DISABLE){ ++ if (offset == PASS_THROUGH2){ ++ regmap_update_bits(gpio->scu, SCU8C, PASS_THROUGH2_MASK, ~(PASS_THROUGH2_ON)); ++ } else if (offset == PASS_THROUGH1){ ++ regmap_update_bits(gpio->scu, SCU8C, PASS_THROUGH1_MASK, ~(PASS_THROUGH1_ON)); ++ } ++ } else { ++ return -ENOTSUPP; ++ } ++ ++ return 0; ++} ++ + static int aspeed_gpio_set_config(struct gpio_chip *chip, unsigned int offset, + unsigned long config) + { + unsigned long param = pinconf_to_config_param(config); + u32 arg = pinconf_to_config_argument(config); +- + if (param == PIN_CONFIG_INPUT_DEBOUNCE) + return set_debounce(chip, offset, arg); + else if (param == PIN_CONFIG_BIAS_DISABLE || +@@ -1006,6 +1042,9 @@ static int aspeed_gpio_set_config(struct gpio_chip *chip, unsigned int offset, + return -ENOTSUPP; + else if (param == PIN_CONFIG_PERSIST_STATE) + return aspeed_gpio_reset_tolerance(chip, offset, arg); ++ else if (param == PIN_CONFIG_PASS_THROUGH_ENABLE || ++ param == PIN_CONFIG_PASS_THROUGH_DISABLE) ++ return aspeed_gpio_pass_through(chip, offset, param); + + return -ENOTSUPP; + } +@@ -1167,7 +1206,11 @@ static int __init aspeed_gpio_probe(struct platform_device *pdev) + gpio->base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(gpio->base)) + return PTR_ERR(gpio->base); +- ++ gpio->scu = syscon_regmap_lookup_by_compatible("aspeed,ast2500-scu"); ++ if (IS_ERR(gpio->scu)) { ++ dev_err(&pdev->dev, "Failed to find SCU regmap\n"); ++ gpio->scu = NULL; ++ } + spin_lock_init(&gpio->lock); + + gpio_id = of_match_node(aspeed_gpio_of_table, pdev->dev.of_node); +diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c +index a8e01d99919c..21eeca17583d 100644 +--- a/drivers/gpio/gpiolib.c ++++ b/drivers/gpio/gpiolib.c +@@ -419,6 +419,7 @@ struct linehandle_state { + GPIOHANDLE_REQUEST_OUTPUT | \ + GPIOHANDLE_REQUEST_ACTIVE_LOW | \ + GPIOHANDLE_REQUEST_OPEN_DRAIN | \ ++ GPIOHANDLE_REQUEST_PASS_THROUGH | \ + GPIOHANDLE_REQUEST_OPEN_SOURCE) + + static long linehandle_ioctl(struct file *filep, unsigned int cmd, +@@ -519,7 +520,6 @@ static int linehandle_create(struct gpio_device *gdev, void __user *ip) + return -EINVAL; + + lflags = handlereq.flags; +- + /* Return an error if an unknown flag is set */ + if (lflags & ~GPIOHANDLE_REQUEST_VALID_FLAGS) + return -EINVAL; +@@ -579,6 +579,8 @@ static int linehandle_create(struct gpio_device *gdev, void __user *ip) + set_bit(FLAG_OPEN_DRAIN, &desc->flags); + if (lflags & GPIOHANDLE_REQUEST_OPEN_SOURCE) + set_bit(FLAG_OPEN_SOURCE, &desc->flags); ++ if (lflags & GPIOHANDLE_REQUEST_PASS_THROUGH) ++ set_bit(FLAG_PASS_THROUGH, &desc->flags); + + ret = gpiod_set_transitory(desc, false); + if (ret < 0) +@@ -598,6 +600,11 @@ static int linehandle_create(struct gpio_device *gdev, void __user *ip) + ret = gpiod_direction_input(desc); + if (ret) + goto out_free_descs; ++ } else if (lflags & GPIOHANDLE_REQUEST_PASS_THROUGH) { ++ int val = !!handlereq.default_values[i]; ++ ret = gpiod_direction_pass_through(desc, val); ++ if (ret) ++ goto out_free_descs; + } + dev_dbg(&gdev->dev, "registered chardev handle for line %d\n", + offset); +@@ -1010,7 +1017,6 @@ static long gpio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) + struct gpio_device *gdev = filp->private_data; + struct gpio_chip *chip = gdev->chip; + void __user *ip = (void __user *)arg; +- + /* We fail any subsequent ioctl():s when the chip is gone */ + if (!chip) + return -ENODEV; +@@ -1018,7 +1024,6 @@ static long gpio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) + /* Fill in the struct and pass to userspace */ + if (cmd == GPIO_GET_CHIPINFO_IOCTL) { + struct gpiochip_info chipinfo; +- + memset(&chipinfo, 0, sizeof(chipinfo)); + + strncpy(chipinfo.name, dev_name(&gdev->dev), +@@ -2643,6 +2648,46 @@ int gpiod_direction_output(struct gpio_desc *desc, int value) + } + EXPORT_SYMBOL_GPL(gpiod_direction_output); + ++/** ++ * gpiod_direction_pass_through - set the GPIO direction to pass-through ++ * @desc: GPIO to set to pass-through ++ * ++ * Set the direction of the passed GPIO to passthrough. ++ * ++ * Return 0 in case of success, else an error code. ++ */ ++int gpiod_direction_pass_through(struct gpio_desc *desc, int val) ++{ ++ struct gpio_chip *gc; ++ ++ VALIDATE_DESC(desc); ++ /* GPIOs used for IRQs shall not be set as pass-through */ ++ if (test_bit(FLAG_USED_AS_IRQ, &desc->flags)) { ++ gpiod_err(desc, ++ "%s: tried to set a GPIO tied to an IRQ as pass-through\n", ++ __func__); ++ return -EIO; ++ } ++ gc = desc->gdev->chip; ++ val = !!val; ++ if (test_bit(FLAG_PASS_THROUGH, &desc->flags)) { ++ if (val) ++ gpio_set_drive_single_ended(gc, gpio_chip_hwgpio(desc), ++ PIN_CONFIG_PASS_THROUGH_ENABLE); ++ else ++ gpio_set_drive_single_ended(gc, gpio_chip_hwgpio(desc), ++ PIN_CONFIG_PASS_THROUGH_DISABLE); ++ } else { ++ gpiod_err(desc, ++ "%s: desc->flags is not set to FLAG_PASS_THROUGH\n", ++ __func__); ++ return -EIO; ++ } ++ ++ return 0; ++} ++EXPORT_SYMBOL_GPL(gpiod_direction_pass_through); ++ + /** + * gpiod_set_debounce - sets @debounce time for a GPIO + * @desc: descriptor of the GPIO for which to set debounce time +diff --git a/drivers/gpio/gpiolib.h b/drivers/gpio/gpiolib.h +index a7e49fef73d4..b143ee47870a 100644 +--- a/drivers/gpio/gpiolib.h ++++ b/drivers/gpio/gpiolib.h +@@ -210,6 +210,7 @@ struct gpio_desc { + #define FLAG_IS_OUT 1 + #define FLAG_EXPORT 2 /* protected by sysfs_lock */ + #define FLAG_SYSFS 3 /* exported via /sys/class/gpio/control */ ++#define FLAG_PASS_THROUGH 4 /*Gpio is passthrough type*/ + #define FLAG_ACTIVE_LOW 6 /* value has active low */ + #define FLAG_OPEN_DRAIN 7 /* Gpio is open drain type */ + #define FLAG_OPEN_SOURCE 8 /* Gpio is open source type */ +diff --git a/include/linux/gpio/consumer.h b/include/linux/gpio/consumer.h +index 21ddbe440030..96551839c191 100644 +--- a/include/linux/gpio/consumer.h ++++ b/include/linux/gpio/consumer.h +@@ -99,6 +99,7 @@ void devm_gpiod_put_array(struct device *dev, struct gpio_descs *descs); + int gpiod_get_direction(struct gpio_desc *desc); + int gpiod_direction_input(struct gpio_desc *desc); + int gpiod_direction_output(struct gpio_desc *desc, int value); ++int gpiod_direction_pass_through(struct gpio_desc *desc, int val); + int gpiod_direction_output_raw(struct gpio_desc *desc, int value); + + /* Value get/set from non-sleeping context */ +@@ -314,6 +315,14 @@ static inline int gpiod_direction_output(struct gpio_desc *desc, int value) + WARN_ON(1); + return -ENOSYS; + } ++ ++static inline int gpiod_direction_pass_through(struct gpio_desc *desc, int val) ++{ ++ /* GPIO can never have been requested */ ++ WARN_ON(1); ++ return -ENOSYS; ++} ++ + static inline int gpiod_direction_output_raw(struct gpio_desc *desc, int value) + { + /* GPIO can never have been requested */ +diff --git a/include/linux/pinctrl/pinconf-generic.h b/include/linux/pinctrl/pinconf-generic.h +index 6c0680641108..59f0cbabb685 100644 +--- a/include/linux/pinctrl/pinconf-generic.h ++++ b/include/linux/pinctrl/pinconf-generic.h +@@ -124,6 +124,8 @@ enum pin_config_param { + PIN_CONFIG_SLEW_RATE, + PIN_CONFIG_SKEW_DELAY, + PIN_CONFIG_PERSIST_STATE, ++ PIN_CONFIG_PASS_THROUGH_ENABLE, ++ PIN_CONFIG_PASS_THROUGH_DISABLE, + PIN_CONFIG_END = 0x7F, + PIN_CONFIG_MAX = 0xFF, + }; +diff --git a/include/uapi/linux/gpio.h b/include/uapi/linux/gpio.h +index 1bf6e6df084b..384ced158412 100644 +--- a/include/uapi/linux/gpio.h ++++ b/include/uapi/linux/gpio.h +@@ -62,6 +62,7 @@ struct gpioline_info { + #define GPIOHANDLE_REQUEST_ACTIVE_LOW (1UL << 2) + #define GPIOHANDLE_REQUEST_OPEN_DRAIN (1UL << 3) + #define GPIOHANDLE_REQUEST_OPEN_SOURCE (1UL << 4) ++#define GPIOHANDLE_REQUEST_PASS_THROUGH (1UL << 5) + + /** + * struct gpiohandle_request - Information about a GPIO handle request +-- +2.19.1 + |