diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.14/950-0091-bcm2835-gpio-exp-Driver-for-GPIO-expander-via-mailbo.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.14/950-0091-bcm2835-gpio-exp-Driver-for-GPIO-expander-via-mailbo.patch | 304 |
1 files changed, 304 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.14/950-0091-bcm2835-gpio-exp-Driver-for-GPIO-expander-via-mailbo.patch b/target/linux/brcm2708/patches-4.14/950-0091-bcm2835-gpio-exp-Driver-for-GPIO-expander-via-mailbo.patch new file mode 100644 index 0000000000..1a58fd261f --- /dev/null +++ b/target/linux/brcm2708/patches-4.14/950-0091-bcm2835-gpio-exp-Driver-for-GPIO-expander-via-mailbo.patch @@ -0,0 +1,304 @@ +From 74e1aacb52fcaf5d07b5d765dca1287e4234f34d Mon Sep 17 00:00:00 2001 +From: Dave Stevenson <dave.stevenson@raspberrypi.org> +Date: Mon, 20 Feb 2017 17:01:21 +0000 +Subject: [PATCH 091/454] bcm2835-gpio-exp: Driver for GPIO expander via + mailbox service + +Pi3 and Compute Module 3 have a GPIO expander that the +VPU communicates with. +There is a mailbox service that now allows control of this +expander, so add a kernel driver that can make use of it. + +Pwr_led node added to device-tree for Pi3. + +Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org> +--- + drivers/gpio/Kconfig | 7 + + drivers/gpio/Makefile | 1 + + drivers/gpio/gpio-bcm-exp.c | 254 ++++++++++++++++++++++++++++++++++++ + 3 files changed, 262 insertions(+) + create mode 100644 drivers/gpio/gpio-bcm-exp.c + +--- a/drivers/gpio/Kconfig ++++ b/drivers/gpio/Kconfig +@@ -128,6 +128,13 @@ config GPIO_AXP209 + help + Say yes to enable GPIO support for the AXP209 PMIC + ++config GPIO_BCM_EXP ++ bool "Broadcom Exp GPIO" ++ depends on OF_GPIO && RASPBERRYPI_FIRMWARE && (ARCH_BCM2835 || COMPILE_TEST) ++ help ++ Turn on GPIO support for Broadcom chips using the firmware mailbox ++ to communicate with VideoCore on BCM283x chips. ++ + config GPIO_BCM_KONA + bool "Broadcom Kona GPIO" + depends on OF_GPIO && (ARCH_BCM_MOBILE || COMPILE_TEST) +--- a/drivers/gpio/Makefile ++++ b/drivers/gpio/Makefile +@@ -33,6 +33,7 @@ obj-$(CONFIG_GPIO_ARIZONA) += gpio-arizo + obj-$(CONFIG_GPIO_ATH79) += gpio-ath79.o + obj-$(CONFIG_GPIO_ASPEED) += gpio-aspeed.o + obj-$(CONFIG_GPIO_AXP209) += gpio-axp209.o ++obj-$(CONFIG_GPIO_BCM_EXP) += gpio-bcm-exp.o + obj-$(CONFIG_GPIO_BCM_KONA) += gpio-bcm-kona.o + obj-$(CONFIG_GPIO_BD9571MWV) += gpio-bd9571mwv.o + obj-$(CONFIG_GPIO_BCM_VIRT) += gpio-bcm-virt.o +--- /dev/null ++++ b/drivers/gpio/gpio-bcm-exp.c +@@ -0,0 +1,254 @@ ++/* ++ * Broadcom expander GPIO driver ++ * ++ * Uses the firmware mailbox service to communicate with the ++ * GPIO expander on the VPU. ++ * ++ * Copyright (C) 2017 Raspberry Pi Trading Ltd. ++ * ++ * Author: Dave Stevenson <dave.stevenson@raspberrypi.org> ++ * Based on gpio-bcm-virt.c by Dom Cobley <popcornmix@gmail.com> ++ * ++ * This program is free software; you can redistribute it and/or modify ++ * it under the terms of the GNU General Public License as published by ++ * the Free Software Foundation; either version 2 of the License, or ++ * (at your option) any later version. ++ */ ++ ++#include <linux/err.h> ++#include <linux/gpio.h> ++#include <linux/module.h> ++#include <linux/platform_device.h> ++#include <linux/dma-mapping.h> ++#include <soc/bcm2835/raspberrypi-firmware.h> ++ ++#define MODULE_NAME "brcmexp-gpio" ++#define NUM_GPIO 8 ++ ++struct brcmexp_gpio { ++ struct gpio_chip gc; ++ struct device *dev; ++ struct rpi_firmware *fw; ++}; ++ ++struct gpio_set_config { ++ u32 gpio, direction, polarity, term_en, term_pull_up, state; ++}; ++ ++struct gpio_get_config { ++ u32 gpio, direction, polarity, term_en, term_pull_up; ++}; ++ ++struct gpio_get_set_state { ++ u32 gpio, state; ++}; ++ ++static int brcmexp_gpio_get_polarity(struct gpio_chip *gc, unsigned int off) ++{ ++ struct brcmexp_gpio *gpio; ++ struct gpio_get_config get; ++ int ret; ++ ++ gpio = container_of(gc, struct brcmexp_gpio, gc); ++ ++ get.gpio = off + gpio->gc.base; /* GPIO to update */ ++ ++ ret = rpi_firmware_property(gpio->fw, RPI_FIRMWARE_GET_GPIO_CONFIG, ++ &get, sizeof(get)); ++ if (ret) { ++ dev_err(gpio->dev, ++ "Failed to get GPIO %u config (%d)\n", off, ret); ++ return ret; ++ } ++ return get.polarity; ++} ++ ++static int brcmexp_gpio_dir_in(struct gpio_chip *gc, unsigned int off) ++{ ++ struct brcmexp_gpio *gpio; ++ struct gpio_set_config set_in; ++ int ret; ++ ++ gpio = container_of(gc, struct brcmexp_gpio, gc); ++ ++ set_in.gpio = off + gpio->gc.base; /* GPIO to update */ ++ set_in.direction = 0; /* Input */ ++ set_in.polarity = brcmexp_gpio_get_polarity(gc, off); ++ /* Retain existing setting */ ++ set_in.term_en = 0; /* termination disabled */ ++ set_in.term_pull_up = 0; /* n/a as termination disabled */ ++ set_in.state = 0; /* n/a as configured as an input */ ++ ++ ret = rpi_firmware_property(gpio->fw, RPI_FIRMWARE_SET_GPIO_CONFIG, ++ &set_in, sizeof(set_in)); ++ if (ret) { ++ dev_err(gpio->dev, ++ "Failed to set GPIO %u to input (%d)\n", ++ off, ret); ++ return ret; ++ } ++ return 0; ++} ++ ++static int brcmexp_gpio_dir_out(struct gpio_chip *gc, unsigned int off, int val) ++{ ++ struct brcmexp_gpio *gpio; ++ struct gpio_set_config set_out; ++ int ret; ++ ++ gpio = container_of(gc, struct brcmexp_gpio, gc); ++ ++ set_out.gpio = off + gpio->gc.base; /* GPIO to update */ ++ set_out.direction = 1; /* Output */ ++ set_out.polarity = brcmexp_gpio_get_polarity(gc, off); ++ /* Retain existing setting */ ++ set_out.term_en = 0; /* n/a as an output */ ++ set_out.term_pull_up = 0; /* n/a as termination disabled */ ++ set_out.state = val; /* Output state */ ++ ++ ret = rpi_firmware_property(gpio->fw, RPI_FIRMWARE_SET_GPIO_CONFIG, ++ &set_out, sizeof(set_out)); ++ if (ret) { ++ dev_err(gpio->dev, ++ "Failed to set GPIO %u to output (%d)\n", off, ret); ++ return ret; ++ } ++ return 0; ++} ++ ++static int brcmexp_gpio_get_direction(struct gpio_chip *gc, unsigned int off) ++{ ++ struct brcmexp_gpio *gpio; ++ struct gpio_get_config get; ++ int ret; ++ ++ gpio = container_of(gc, struct brcmexp_gpio, gc); ++ ++ get.gpio = off + gpio->gc.base; /* GPIO to update */ ++ ++ ret = rpi_firmware_property(gpio->fw, RPI_FIRMWARE_GET_GPIO_CONFIG, ++ &get, sizeof(get)); ++ if (ret) { ++ dev_err(gpio->dev, ++ "Failed to get GPIO %u config (%d)\n", off, ret); ++ return ret; ++ } ++ return get.direction ? GPIOF_DIR_OUT : GPIOF_DIR_IN; ++} ++ ++static int brcmexp_gpio_get(struct gpio_chip *gc, unsigned int off) ++{ ++ struct brcmexp_gpio *gpio; ++ struct gpio_get_set_state get; ++ int ret; ++ ++ gpio = container_of(gc, struct brcmexp_gpio, gc); ++ ++ get.gpio = off + gpio->gc.base; /* GPIO to update */ ++ get.state = 0; /* storage for returned value */ ++ ++ ret = rpi_firmware_property(gpio->fw, RPI_FIRMWARE_GET_GPIO_STATE, ++ &get, sizeof(get)); ++ if (ret) { ++ dev_err(gpio->dev, ++ "Failed to get GPIO %u state (%d)\n", off, ret); ++ return ret; ++ } ++ return !!get.state; ++} ++ ++static void brcmexp_gpio_set(struct gpio_chip *gc, unsigned int off, int val) ++{ ++ struct brcmexp_gpio *gpio; ++ struct gpio_get_set_state set; ++ int ret; ++ ++ gpio = container_of(gc, struct brcmexp_gpio, gc); ++ ++ set.gpio = off + gpio->gc.base; /* GPIO to update */ ++ set.state = val; /* Output state */ ++ ++ ret = rpi_firmware_property(gpio->fw, RPI_FIRMWARE_SET_GPIO_STATE, ++ &set, sizeof(set)); ++ if (ret) ++ dev_err(gpio->dev, ++ "Failed to set GPIO %u state (%d)\n", off, ret); ++} ++ ++static int brcmexp_gpio_probe(struct platform_device *pdev) ++{ ++ int err = 0; ++ struct device *dev = &pdev->dev; ++ struct device_node *np = dev->of_node; ++ struct device_node *fw_node; ++ struct rpi_firmware *fw; ++ struct brcmexp_gpio *ucb; ++ ++ fw_node = of_parse_phandle(np, "firmware", 0); ++ if (!fw_node) { ++ dev_err(dev, "Missing firmware node\n"); ++ return -ENOENT; ++ } ++ ++ fw = rpi_firmware_get(fw_node); ++ if (!fw) ++ return -EPROBE_DEFER; ++ ++ ucb = devm_kzalloc(dev, sizeof(*ucb), GFP_KERNEL); ++ if (!ucb) ++ return -EINVAL; ++ ++ ucb->fw = fw; ++ ucb->dev = dev; ++ ucb->gc.label = MODULE_NAME; ++ ucb->gc.owner = THIS_MODULE; ++ ucb->gc.of_node = np; ++ ucb->gc.base = 128; ++ ucb->gc.ngpio = NUM_GPIO; ++ ++ ucb->gc.direction_input = brcmexp_gpio_dir_in; ++ ucb->gc.direction_output = brcmexp_gpio_dir_out; ++ ucb->gc.get_direction = brcmexp_gpio_get_direction; ++ ucb->gc.get = brcmexp_gpio_get; ++ ucb->gc.set = brcmexp_gpio_set; ++ ucb->gc.can_sleep = true; ++ ++ err = gpiochip_add(&ucb->gc); ++ if (err) ++ return err; ++ ++ platform_set_drvdata(pdev, ucb); ++ ++ return 0; ++} ++ ++static int brcmexp_gpio_remove(struct platform_device *pdev) ++{ ++ struct brcmexp_gpio *ucb = platform_get_drvdata(pdev); ++ ++ gpiochip_remove(&ucb->gc); ++ ++ return 0; ++} ++ ++static const struct of_device_id __maybe_unused brcmexp_gpio_ids[] = { ++ { .compatible = "brcm,bcm2835-expgpio" }, ++ { } ++}; ++MODULE_DEVICE_TABLE(of, brcmexp_gpio_ids); ++ ++static struct platform_driver brcmexp_gpio_driver = { ++ .driver = { ++ .name = MODULE_NAME, ++ .owner = THIS_MODULE, ++ .of_match_table = of_match_ptr(brcmexp_gpio_ids), ++ }, ++ .probe = brcmexp_gpio_probe, ++ .remove = brcmexp_gpio_remove, ++}; ++module_platform_driver(brcmexp_gpio_driver); ++ ++MODULE_LICENSE("GPL"); ++MODULE_AUTHOR("Dave Stevenson <dave.stevenson@raspberrypi.org>"); ++MODULE_DESCRIPTION("brcm-exp GPIO driver"); ++MODULE_ALIAS("platform:brcmexp-gpio"); |