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path: root/target/linux/brcm2708/patches-4.14/950-0091-bcm2835-gpio-exp-Driver-for-GPIO-expander-via-mailbo.patch
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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.patch304
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");
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-15 01:54:53 +0000