From a411e81e61df24023f40255145d8f023402002c9 Mon Sep 17 00:00:00 2001 From: Bartosz Golaszewski Date: Tue, 10 Apr 2018 22:30:28 +0200 Subject: gpiolib: add hogs support for machine code Board files constitute a significant part of the users of the legacy GPIO framework. In many cases they only export a line and set its desired value. We could use GPIO hogs for that like we do for DT and ACPI but there's no support for that in machine code. This patch proposes to extend the machine.h API with support for registering hog tables in board files. Signed-off-by: Bartosz Golaszewski Signed-off-by: Linus Walleij --- include/linux/gpio/machine.h | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) (limited to 'include') diff --git a/include/linux/gpio/machine.h b/include/linux/gpio/machine.h index b2f2dc638463..daa44eac9241 100644 --- a/include/linux/gpio/machine.h +++ b/include/linux/gpio/machine.h @@ -39,6 +39,23 @@ struct gpiod_lookup_table { struct gpiod_lookup table[]; }; +/** + * struct gpiod_hog - GPIO line hog table + * @chip_label: name of the chip the GPIO belongs to + * @chip_hwnum: hardware number (i.e. relative to the chip) of the GPIO + * @line_name: consumer name for the hogged line + * @lflags: mask of GPIO lookup flags + * @dflags: GPIO flags used to specify the direction and value + */ +struct gpiod_hog { + struct list_head list; + const char *chip_label; + u16 chip_hwnum; + const char *line_name; + enum gpio_lookup_flags lflags; + int dflags; +}; + /* * Simple definition of a single GPIO under a con_id */ @@ -59,10 +76,23 @@ struct gpiod_lookup_table { .flags = _flags, \ } +/* + * Simple definition of a single GPIO hog in an array. + */ +#define GPIO_HOG(_chip_label, _chip_hwnum, _line_name, _lflags, _dflags) \ +{ \ + .chip_label = _chip_label, \ + .chip_hwnum = _chip_hwnum, \ + .line_name = _line_name, \ + .lflags = _lflags, \ + .dflags = _dflags, \ +} + #ifdef CONFIG_GPIOLIB void gpiod_add_lookup_table(struct gpiod_lookup_table *table); void gpiod_add_lookup_tables(struct gpiod_lookup_table **tables, size_t n); void gpiod_remove_lookup_table(struct gpiod_lookup_table *table); +void gpiod_add_hogs(struct gpiod_hog *hogs); #else static inline void gpiod_add_lookup_table(struct gpiod_lookup_table *table) {} @@ -70,6 +100,7 @@ static inline void gpiod_add_lookup_tables(struct gpiod_lookup_table **tables, size_t n) {} static inline void gpiod_remove_lookup_table(struct gpiod_lookup_table *table) {} +static inline void gpiod_add_hogs(struct gpiod_hog *hogs) {} #endif #endif /* __LINUX_GPIO_MACHINE_H */ -- cgit v1.2.3 From e6ca26abd37606ba4864f20c85d3fe4a2173b93f Mon Sep 17 00:00:00 2001 From: Phil Edworthy Date: Thu, 26 Apr 2018 17:19:47 +0100 Subject: gpio: dwapb: Add support for 1 interrupt per port A GPIO The DesignWare GPIO IP can be configured for either 1 interrupt or 1 per GPIO in port A, but the driver currently only supports 1 interrupt. See the DesignWare DW_apb_gpio Databook description of the 'GPIO_INTR_IO' parameter. This change allows the driver to work with up to 32 interrupts, it will get as many interrupts as specified in the DT 'interrupts' property. It doesn't do anything clever with the different interrupts, it just calls the same handler used for single interrupt hardware. ACPI companion code provided by Hoan Tran . This was tested on X-Gene by Hoan. Signed-off-by: Phil Edworthy Reviewed-by: Rob Herring Acked-by: Lee Jones Acked-by: Hoan Tran Signed-off-by: Linus Walleij --- .../devicetree/bindings/gpio/snps-dwapb-gpio.txt | 9 ++++- drivers/gpio/gpio-dwapb.c | 46 +++++++++++++++++----- drivers/mfd/intel_quark_i2c_gpio.c | 3 +- include/linux/platform_data/gpio-dwapb.h | 3 +- 4 files changed, 48 insertions(+), 13 deletions(-) (limited to 'include') diff --git a/Documentation/devicetree/bindings/gpio/snps-dwapb-gpio.txt b/Documentation/devicetree/bindings/gpio/snps-dwapb-gpio.txt index 4a75da7051bd..3c1118bc67f5 100644 --- a/Documentation/devicetree/bindings/gpio/snps-dwapb-gpio.txt +++ b/Documentation/devicetree/bindings/gpio/snps-dwapb-gpio.txt @@ -26,8 +26,13 @@ controller. the second encodes the triger flags encoded as described in Documentation/devicetree/bindings/interrupt-controller/interrupts.txt - interrupt-parent : The parent interrupt controller. -- interrupts : The interrupt to the parent controller raised when GPIOs - generate the interrupts. +- interrupts : The interrupts to the parent controller raised when GPIOs + generate the interrupts. If the controller provides one combined interrupt + for all GPIOs, specify a single interrupt. If the controller provides one + interrupt for each GPIO, provide a list of interrupts that correspond to each + of the GPIO pins. When specifying multiple interrupts, if any are unconnected, + use the interrupts-extended property to specify the interrupts and set the + interrupt controller handle for unused interrupts to 0. - snps,nr-gpios : The number of pins in the port, a single cell. - resets : Reset line for the controller. diff --git a/drivers/gpio/gpio-dwapb.c b/drivers/gpio/gpio-dwapb.c index 226977f78482..7dcd06b11570 100644 --- a/drivers/gpio/gpio-dwapb.c +++ b/drivers/gpio/gpio-dwapb.c @@ -441,14 +441,19 @@ static void dwapb_configure_irqs(struct dwapb_gpio *gpio, irq_gc->chip_types[1].handler = handle_edge_irq; if (!pp->irq_shared) { - irq_set_chained_handler_and_data(pp->irq, dwapb_irq_handler, - gpio); + int i; + + for (i = 0; i < pp->ngpio; i++) { + if (pp->irq[i]) + irq_set_chained_handler_and_data(pp->irq[i], + dwapb_irq_handler, gpio); + } } else { /* * Request a shared IRQ since where MFD would have devices * using the same irq pin */ - err = devm_request_irq(gpio->dev, pp->irq, + err = devm_request_irq(gpio->dev, pp->irq[0], dwapb_irq_handler_mfd, IRQF_SHARED, "gpio-dwapb-mfd", gpio); if (err) { @@ -524,7 +529,7 @@ static int dwapb_gpio_add_port(struct dwapb_gpio *gpio, if (pp->idx == 0) port->gc.set_config = dwapb_gpio_set_config; - if (pp->irq) + if (pp->has_irq) dwapb_configure_irqs(gpio, port, pp); err = gpiochip_add_data(&port->gc, port); @@ -535,7 +540,7 @@ static int dwapb_gpio_add_port(struct dwapb_gpio *gpio, port->is_registered = true; /* Add GPIO-signaled ACPI event support */ - if (pp->irq) + if (pp->has_irq) acpi_gpiochip_request_interrupts(&port->gc); return err; @@ -601,13 +606,36 @@ dwapb_gpio_get_pdata(struct device *dev) if (dev->of_node && pp->idx == 0 && fwnode_property_read_bool(fwnode, "interrupt-controller")) { - pp->irq = irq_of_parse_and_map(to_of_node(fwnode), 0); - if (!pp->irq) + struct device_node *np = to_of_node(fwnode); + unsigned int j; + + /* + * The IP has configuration options to allow a single + * combined interrupt or one per gpio. If one per gpio, + * some might not be used. + */ + for (j = 0; j < pp->ngpio; j++) { + int irq = of_irq_get(np, j); + if (irq < 0) + continue; + + pp->irq[j] = irq; + pp->has_irq = true; + } + + if (!pp->has_irq) dev_warn(dev, "no irq for port%d\n", pp->idx); } - if (has_acpi_companion(dev) && pp->idx == 0) - pp->irq = platform_get_irq(to_platform_device(dev), 0); + if (has_acpi_companion(dev) && pp->idx == 0) { + unsigned int j; + + for (j = 0; j < pp->ngpio; j++) { + pp->irq[j] = platform_get_irq(to_platform_device(dev), j); + if (pp->irq[j]) + pp->has_irq = true; + } + } pp->irq_shared = false; pp->gpio_base = -1; diff --git a/drivers/mfd/intel_quark_i2c_gpio.c b/drivers/mfd/intel_quark_i2c_gpio.c index 90e35dec8648..5bddb84cfc1f 100644 --- a/drivers/mfd/intel_quark_i2c_gpio.c +++ b/drivers/mfd/intel_quark_i2c_gpio.c @@ -233,7 +233,8 @@ static int intel_quark_gpio_setup(struct pci_dev *pdev, struct mfd_cell *cell) pdata->properties->idx = 0; pdata->properties->ngpio = INTEL_QUARK_MFD_NGPIO; pdata->properties->gpio_base = INTEL_QUARK_MFD_GPIO_BASE; - pdata->properties->irq = pdev->irq; + pdata->properties->irq[0] = pdev->irq; + pdata->properties->has_irq = true; pdata->properties->irq_shared = true; cell->platform_data = pdata; diff --git a/include/linux/platform_data/gpio-dwapb.h b/include/linux/platform_data/gpio-dwapb.h index 2dc7f4a8ab09..5a52d69c13f3 100644 --- a/include/linux/platform_data/gpio-dwapb.h +++ b/include/linux/platform_data/gpio-dwapb.h @@ -19,7 +19,8 @@ struct dwapb_port_property { unsigned int idx; unsigned int ngpio; unsigned int gpio_base; - unsigned int irq; + unsigned int irq[32]; + bool has_irq; bool irq_shared; }; -- cgit v1.2.3 From 3027743f83f867d85662f5134e835c2e199cb9be Mon Sep 17 00:00:00 2001 From: Laura Abbott Date: Mon, 21 May 2018 10:57:07 -0700 Subject: gpio: Remove VLA from gpiolib The new challenge is to remove VLAs from the kernel (see https://lkml.org/lkml/2018/3/7/621) to eventually turn on -Wvla. Using a kmalloc array is the easy way to fix this but kmalloc is still more expensive than stack allocation. Introduce a fast path with a fixed size stack array to cover most chip with gpios below some fixed amount. The slow path dynamically allocates an array to cover those chips with a large number of gpios. Reviewed-by: Geert Uytterhoeven Reviewed-by: Phil Reid Reviewed-and-tested-by: Lukas Wunner Signed-off-by: Lukas Wunner Signed-off-by: Laura Abbott Reviewed-by: Andy Shevchenko Signed-off-by: Linus Walleij --- drivers/gpio/Kconfig | 12 +++++++ drivers/gpio/gpiolib.c | 76 +++++++++++++++++++++++++++++++++---------- drivers/gpio/gpiolib.h | 2 +- include/linux/gpio/consumer.h | 10 +++--- 4 files changed, 78 insertions(+), 22 deletions(-) (limited to 'include') diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index b960f6f35abd..71c0ab46f216 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -22,6 +22,18 @@ menuconfig GPIOLIB if GPIOLIB +config GPIOLIB_FASTPATH_LIMIT + int "Maximum number of GPIOs for fast path" + range 32 512 + default 512 + help + This adjusts the point at which certain APIs will switch from + using a stack allocated buffer to a dynamically allocated buffer. + + You shouldn't need to change this unless you really need to + optimize either stack space or performance. Change this carefully + since setting an incorrect value could cause stack corruption. + config OF_GPIO def_bool y depends on OF diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index d1171db66c30..487edf188138 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -61,6 +61,11 @@ static struct bus_type gpio_bus_type = { .name = "gpio", }; +/* + * Number of GPIOs to use for the fast path in set array + */ +#define FASTPATH_NGPIO CONFIG_GPIOLIB_FASTPATH_LIMIT + /* gpio_lock prevents conflicts during gpio_desc[] table updates. * While any GPIO is requested, its gpio_chip is not removable; * each GPIO's "requested" flag serves as a lock and refcount. @@ -453,12 +458,11 @@ static long linehandle_ioctl(struct file *filep, unsigned int cmd, vals[i] = !!ghd.values[i]; /* Reuse the array setting function */ - gpiod_set_array_value_complex(false, + return gpiod_set_array_value_complex(false, true, lh->numdescs, lh->descs, vals); - return 0; } return -EINVAL; } @@ -1281,6 +1285,10 @@ int gpiochip_add_data_with_key(struct gpio_chip *chip, void *data, goto err_free_descs; } + if (chip->ngpio > FASTPATH_NGPIO) + chip_warn(chip, "line cnt %u is greater than fast path cnt %u\n", + chip->ngpio, FASTPATH_NGPIO); + gdev->label = kstrdup_const(chip->label ?: "unknown", GFP_KERNEL); if (!gdev->label) { status = -ENOMEM; @@ -2758,16 +2766,28 @@ int gpiod_get_array_value_complex(bool raw, bool can_sleep, while (i < array_size) { struct gpio_chip *chip = desc_array[i]->gdev->chip; - unsigned long mask[BITS_TO_LONGS(chip->ngpio)]; - unsigned long bits[BITS_TO_LONGS(chip->ngpio)]; + unsigned long fastpath[2 * BITS_TO_LONGS(FASTPATH_NGPIO)]; + unsigned long *mask, *bits; int first, j, ret; + if (likely(chip->ngpio <= FASTPATH_NGPIO)) { + mask = fastpath; + } else { + mask = kmalloc_array(2 * BITS_TO_LONGS(chip->ngpio), + sizeof(*mask), + can_sleep ? GFP_KERNEL : GFP_ATOMIC); + if (!mask) + return -ENOMEM; + } + + bits = mask + BITS_TO_LONGS(chip->ngpio); + bitmap_zero(mask, chip->ngpio); + if (!can_sleep) WARN_ON(chip->can_sleep); /* collect all inputs belonging to the same chip */ first = i; - memset(mask, 0, sizeof(mask)); do { const struct gpio_desc *desc = desc_array[i]; int hwgpio = gpio_chip_hwgpio(desc); @@ -2778,8 +2798,11 @@ int gpiod_get_array_value_complex(bool raw, bool can_sleep, (desc_array[i]->gdev->chip == chip)); ret = gpio_chip_get_multiple(chip, mask, bits); - if (ret) + if (ret) { + if (mask != fastpath) + kfree(mask); return ret; + } for (j = first; j < i; j++) { const struct gpio_desc *desc = desc_array[j]; @@ -2791,6 +2814,9 @@ int gpiod_get_array_value_complex(bool raw, bool can_sleep, value_array[j] = value; trace_gpio_value(desc_to_gpio(desc), 1, value); } + + if (mask != fastpath) + kfree(mask); } return 0; } @@ -2974,7 +3000,7 @@ static void gpio_chip_set_multiple(struct gpio_chip *chip, } } -void gpiod_set_array_value_complex(bool raw, bool can_sleep, +int gpiod_set_array_value_complex(bool raw, bool can_sleep, unsigned int array_size, struct gpio_desc **desc_array, int *value_array) @@ -2983,14 +3009,26 @@ void gpiod_set_array_value_complex(bool raw, bool can_sleep, while (i < array_size) { struct gpio_chip *chip = desc_array[i]->gdev->chip; - unsigned long mask[BITS_TO_LONGS(chip->ngpio)]; - unsigned long bits[BITS_TO_LONGS(chip->ngpio)]; + unsigned long fastpath[2 * BITS_TO_LONGS(FASTPATH_NGPIO)]; + unsigned long *mask, *bits; int count = 0; + if (likely(chip->ngpio <= FASTPATH_NGPIO)) { + mask = fastpath; + } else { + mask = kmalloc_array(2 * BITS_TO_LONGS(chip->ngpio), + sizeof(*mask), + can_sleep ? GFP_KERNEL : GFP_ATOMIC); + if (!mask) + return -ENOMEM; + } + + bits = mask + BITS_TO_LONGS(chip->ngpio); + bitmap_zero(mask, chip->ngpio); + if (!can_sleep) WARN_ON(chip->can_sleep); - memset(mask, 0, sizeof(mask)); do { struct gpio_desc *desc = desc_array[i]; int hwgpio = gpio_chip_hwgpio(desc); @@ -3021,7 +3059,11 @@ void gpiod_set_array_value_complex(bool raw, bool can_sleep, /* push collected bits to outputs */ if (count != 0) gpio_chip_set_multiple(chip, mask, bits); + + if (mask != fastpath) + kfree(mask); } + return 0; } /** @@ -3096,13 +3138,13 @@ EXPORT_SYMBOL_GPL(gpiod_set_value); * This function should be called from contexts where we cannot sleep, and will * complain if the GPIO chip functions potentially sleep. */ -void gpiod_set_raw_array_value(unsigned int array_size, +int gpiod_set_raw_array_value(unsigned int array_size, struct gpio_desc **desc_array, int *value_array) { if (!desc_array) - return; - gpiod_set_array_value_complex(true, false, array_size, desc_array, - value_array); + return -EINVAL; + return gpiod_set_array_value_complex(true, false, array_size, + desc_array, value_array); } EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value); @@ -3422,14 +3464,14 @@ EXPORT_SYMBOL_GPL(gpiod_set_value_cansleep); * * This function is to be called from contexts that can sleep. */ -void gpiod_set_raw_array_value_cansleep(unsigned int array_size, +int gpiod_set_raw_array_value_cansleep(unsigned int array_size, struct gpio_desc **desc_array, int *value_array) { might_sleep_if(extra_checks); if (!desc_array) - return; - gpiod_set_array_value_complex(true, true, array_size, desc_array, + return -EINVAL; + return gpiod_set_array_value_complex(true, true, array_size, desc_array, value_array); } EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value_cansleep); diff --git a/drivers/gpio/gpiolib.h b/drivers/gpio/gpiolib.h index ad456b6f9d8b..1a8e20363861 100644 --- a/drivers/gpio/gpiolib.h +++ b/drivers/gpio/gpiolib.h @@ -188,7 +188,7 @@ int gpiod_get_array_value_complex(bool raw, bool can_sleep, unsigned int array_size, struct gpio_desc **desc_array, int *value_array); -void gpiod_set_array_value_complex(bool raw, bool can_sleep, +int gpiod_set_array_value_complex(bool raw, bool can_sleep, unsigned int array_size, struct gpio_desc **desc_array, int *value_array); diff --git a/include/linux/gpio/consumer.h b/include/linux/gpio/consumer.h index dbd065963296..243112c7fa7d 100644 --- a/include/linux/gpio/consumer.h +++ b/include/linux/gpio/consumer.h @@ -116,7 +116,7 @@ int gpiod_get_raw_array_value(unsigned int array_size, struct gpio_desc **desc_array, int *value_array); void gpiod_set_raw_value(struct gpio_desc *desc, int value); -void gpiod_set_raw_array_value(unsigned int array_size, +int gpiod_set_raw_array_value(unsigned int array_size, struct gpio_desc **desc_array, int *value_array); @@ -134,7 +134,7 @@ int gpiod_get_raw_array_value_cansleep(unsigned int array_size, struct gpio_desc **desc_array, int *value_array); void gpiod_set_raw_value_cansleep(struct gpio_desc *desc, int value); -void gpiod_set_raw_array_value_cansleep(unsigned int array_size, +int gpiod_set_raw_array_value_cansleep(unsigned int array_size, struct gpio_desc **desc_array, int *value_array); @@ -369,12 +369,13 @@ static inline void gpiod_set_raw_value(struct gpio_desc *desc, int value) /* GPIO can never have been requested */ WARN_ON(1); } -static inline void gpiod_set_raw_array_value(unsigned int array_size, +static inline int gpiod_set_raw_array_value(unsigned int array_size, struct gpio_desc **desc_array, int *value_array) { /* GPIO can never have been requested */ WARN_ON(1); + return 0; } static inline int gpiod_get_value_cansleep(const struct gpio_desc *desc) @@ -423,12 +424,13 @@ static inline void gpiod_set_raw_value_cansleep(struct gpio_desc *desc, /* GPIO can never have been requested */ WARN_ON(1); } -static inline void gpiod_set_raw_array_value_cansleep(unsigned int array_size, +static inline int gpiod_set_raw_array_value_cansleep(unsigned int array_size, struct gpio_desc **desc_array, int *value_array) { /* GPIO can never have been requested */ WARN_ON(1); + return 0; } static inline int gpiod_set_debounce(struct gpio_desc *desc, unsigned debounce) -- cgit v1.2.3 From 02f6bf8717a359cabe042c632f3d03fc772450bf Mon Sep 17 00:00:00 2001 From: Phil Edworthy Date: Fri, 25 May 2018 16:11:34 +0100 Subject: gpio: dwapb: Fix rework support for 1 interrupt per port A GPIO Commit da069d5d2b814d9887989dcdb29fb0202eac8b38 ("gpio: dwapb: Rework support for 1 interrupt per port A GPIO"), was an incremental patch that was supposed to provide the delta between v5 and v6 patch set for adding support for 1 interupt per port A GPIO. v5 was applied, then some other feedback came afterwards. However, in my haste I managed to drop the changes made to dwapb_port_property struct. This patch includes those missing changes. Signed-off-by: Phil Edworthy Signed-off-by: Linus Walleij --- include/linux/platform_data/gpio-dwapb.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'include') diff --git a/include/linux/platform_data/gpio-dwapb.h b/include/linux/platform_data/gpio-dwapb.h index 5a52d69c13f3..419cfacb4b42 100644 --- a/include/linux/platform_data/gpio-dwapb.h +++ b/include/linux/platform_data/gpio-dwapb.h @@ -19,7 +19,7 @@ struct dwapb_port_property { unsigned int idx; unsigned int ngpio; unsigned int gpio_base; - unsigned int irq[32]; + int irq[32]; bool has_irq; bool irq_shared; }; -- cgit v1.2.3