011f2c26f1
As usual these patches were extracted and rebased from the raspberry pi repo: https://github.com/raspberrypi/linux/tree/rpi-4.4.y Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
245 lines
7.0 KiB
Diff
245 lines
7.0 KiB
Diff
From 3ffde07f9d0ee50522cb017639c12a83cfd6409b Mon Sep 17 00:00:00 2001
|
|
From: popcornmix <popcornmix@gmail.com>
|
|
Date: Tue, 23 Feb 2016 19:56:04 +0000
|
|
Subject: [PATCH] bcm2835-virtgpio: Virtual GPIO driver
|
|
|
|
Add a virtual GPIO driver that uses the firmware mailbox interface to
|
|
request that the VPU toggles LEDs.
|
|
---
|
|
arch/arm/configs/bcm2709_defconfig | 1 +
|
|
drivers/gpio/Kconfig | 6 +
|
|
drivers/gpio/Makefile | 1 +
|
|
drivers/gpio/gpio-bcm-virt.c | 180 +++++++++++++++++++++++++++++
|
|
include/soc/bcm2835/raspberrypi-firmware.h | 1 +
|
|
5 files changed, 189 insertions(+)
|
|
create mode 100644 drivers/gpio/gpio-bcm-virt.c
|
|
|
|
--- a/arch/arm/configs/bcm2709_defconfig
|
|
+++ b/arch/arm/configs/bcm2709_defconfig
|
|
@@ -607,6 +607,7 @@ CONFIG_PPS=m
|
|
CONFIG_PPS_CLIENT_LDISC=m
|
|
CONFIG_PPS_CLIENT_GPIO=m
|
|
CONFIG_GPIO_SYSFS=y
|
|
+CONFIG_GPIO_BCM_VIRT=y
|
|
CONFIG_GPIO_ARIZONA=m
|
|
CONFIG_GPIO_STMPE=y
|
|
CONFIG_W1=m
|
|
--- a/drivers/gpio/Kconfig
|
|
+++ b/drivers/gpio/Kconfig
|
|
@@ -133,6 +133,12 @@ config GPIO_BCM_KONA
|
|
help
|
|
Turn on GPIO support for Broadcom "Kona" chips.
|
|
|
|
+config GPIO_BCM_VIRT
|
|
+ bool "Broadcom Virt GPIO"
|
|
+ depends on OF_GPIO && RASPBERRYPI_FIRMWARE && (ARCH_BCM2835 || ARCH_BCM2708 || ARCH_BCM2709 || COMPILE_TEST)
|
|
+ help
|
|
+ Turn on virtual GPIO support for Broadcom BCM283X chips.
|
|
+
|
|
config GPIO_BRCMSTB
|
|
tristate "BRCMSTB GPIO support"
|
|
default y if ARCH_BRCMSTB
|
|
--- a/drivers/gpio/Makefile
|
|
+++ b/drivers/gpio/Makefile
|
|
@@ -24,6 +24,7 @@ obj-$(CONFIG_GPIO_AMDPT) += gpio-amdpt.o
|
|
obj-$(CONFIG_GPIO_ARIZONA) += gpio-arizona.o
|
|
obj-$(CONFIG_ATH79) += gpio-ath79.o
|
|
obj-$(CONFIG_GPIO_BCM_KONA) += gpio-bcm-kona.o
|
|
+obj-$(CONFIG_GPIO_BCM_VIRT) += gpio-bcm-virt.o
|
|
obj-$(CONFIG_GPIO_BRCMSTB) += gpio-brcmstb.o
|
|
obj-$(CONFIG_GPIO_BT8XX) += gpio-bt8xx.o
|
|
obj-$(CONFIG_GPIO_CLPS711X) += gpio-clps711x.o
|
|
--- /dev/null
|
|
+++ b/drivers/gpio/gpio-bcm-virt.c
|
|
@@ -0,0 +1,180 @@
|
|
+/*
|
|
+ * brcmvirt GPIO driver
|
|
+ *
|
|
+ * Copyright (C) 2012,2013 Dom Cobley <popcornmix@gmail.com>
|
|
+ * Based on gpio-clps711x.c by Alexander Shiyan <shc_work@mail.ru>
|
|
+ *
|
|
+ * 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/basic_mmio_gpio.h>
|
|
+#include <linux/platform_device.h>
|
|
+#include <soc/bcm2835/raspberrypi-firmware.h>
|
|
+
|
|
+#define MODULE_NAME "brcmvirt-gpio"
|
|
+#define NUM_GPIO 2
|
|
+
|
|
+struct brcmvirt_gpio {
|
|
+ struct gpio_chip gc;
|
|
+ u32 __iomem *ts_base;
|
|
+ /* two packed 16-bit counts of enabled and disables
|
|
+ Allows host to detect a brief enable that was missed */
|
|
+ u32 enables_disables[NUM_GPIO];
|
|
+};
|
|
+
|
|
+static int brcmvirt_gpio_dir_in(struct gpio_chip *gc, unsigned off)
|
|
+{
|
|
+ struct brcmvirt_gpio *gpio;
|
|
+ gpio = container_of(gc, struct brcmvirt_gpio, gc);
|
|
+ return -EINVAL;
|
|
+}
|
|
+
|
|
+static int brcmvirt_gpio_dir_out(struct gpio_chip *gc, unsigned off, int val)
|
|
+{
|
|
+ struct brcmvirt_gpio *gpio;
|
|
+ gpio = container_of(gc, struct brcmvirt_gpio, gc);
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static int brcmvirt_gpio_get(struct gpio_chip *gc, unsigned off)
|
|
+{
|
|
+ struct brcmvirt_gpio *gpio;
|
|
+ unsigned v;
|
|
+ gpio = container_of(gc, struct brcmvirt_gpio, gc);
|
|
+ v = readl(gpio->ts_base + off);
|
|
+ return (v >> off) & 1;
|
|
+}
|
|
+
|
|
+static void brcmvirt_gpio_set(struct gpio_chip *gc, unsigned off, int val)
|
|
+{
|
|
+ struct brcmvirt_gpio *gpio;
|
|
+ u16 enables, disables;
|
|
+ s16 diff;
|
|
+ bool lit;
|
|
+ gpio = container_of(gc, struct brcmvirt_gpio, gc);
|
|
+ enables = gpio->enables_disables[off] >> 16;
|
|
+ disables = gpio->enables_disables[off] >> 0;
|
|
+ diff = (s16)(enables - disables);
|
|
+ lit = diff > 0;
|
|
+ if ((val && lit) || (!val && !lit))
|
|
+ return;
|
|
+ if (val)
|
|
+ enables++;
|
|
+ else
|
|
+ disables++;
|
|
+ diff = (s16)(enables - disables);
|
|
+ BUG_ON(diff != 0 && diff != 1);
|
|
+ gpio->enables_disables[off] = (enables << 16) | (disables << 0);
|
|
+ writel(gpio->enables_disables[off], gpio->ts_base + off);
|
|
+}
|
|
+
|
|
+static int brcmvirt_gpio_probe(struct platform_device *pdev)
|
|
+{
|
|
+ struct device *dev = &pdev->dev;
|
|
+ struct device_node *np = dev->of_node;
|
|
+ struct device_node *fw_node;
|
|
+ struct rpi_firmware *fw;
|
|
+ struct brcmvirt_gpio *ucb;
|
|
+ u32 gpiovirtbuf;
|
|
+ int err = 0;
|
|
+
|
|
+ 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;
|
|
+
|
|
+ err = rpi_firmware_property(fw, RPI_FIRMWARE_FRAMEBUFFER_GET_GPIOVIRTBUF,
|
|
+ &gpiovirtbuf, sizeof(gpiovirtbuf));
|
|
+
|
|
+ if (err) {
|
|
+ dev_err(dev, "Failed to get gpiovirtbuf\n");
|
|
+ goto err;
|
|
+ }
|
|
+
|
|
+ if (!gpiovirtbuf) {
|
|
+ dev_err(dev, "No virtgpio buffer\n");
|
|
+ err = -ENOENT;
|
|
+ goto err;
|
|
+ }
|
|
+
|
|
+ ucb = devm_kzalloc(dev, sizeof *ucb, GFP_KERNEL);
|
|
+ if (!ucb) {
|
|
+ err = -EINVAL;
|
|
+ goto err;
|
|
+ }
|
|
+
|
|
+ // mmap the physical memory
|
|
+ gpiovirtbuf &= ~0xc0000000;
|
|
+ ucb->ts_base = ioremap(gpiovirtbuf, 4096);
|
|
+ if (ucb->ts_base == NULL) {
|
|
+ dev_err(dev, "Failed to map physical address\n");
|
|
+ err = -ENOENT;
|
|
+ goto err;
|
|
+ }
|
|
+
|
|
+ ucb->gc.label = MODULE_NAME;
|
|
+ ucb->gc.owner = THIS_MODULE;
|
|
+ ucb->gc.dev = dev;
|
|
+ ucb->gc.of_node = np;
|
|
+ ucb->gc.base = 100;
|
|
+ ucb->gc.ngpio = NUM_GPIO;
|
|
+
|
|
+ ucb->gc.direction_input = brcmvirt_gpio_dir_in;
|
|
+ ucb->gc.direction_output = brcmvirt_gpio_dir_out;
|
|
+ ucb->gc.get = brcmvirt_gpio_get;
|
|
+ ucb->gc.set = brcmvirt_gpio_set;
|
|
+ ucb->gc.can_sleep = true;
|
|
+
|
|
+ err = gpiochip_add(&ucb->gc);
|
|
+ if (err)
|
|
+ goto err;
|
|
+
|
|
+ platform_set_drvdata(pdev, ucb);
|
|
+
|
|
+err:
|
|
+ return err;
|
|
+
|
|
+}
|
|
+
|
|
+static int brcmvirt_gpio_remove(struct platform_device *pdev)
|
|
+{
|
|
+ int err = 0;
|
|
+ struct brcmvirt_gpio *ucb = platform_get_drvdata(pdev);
|
|
+
|
|
+ gpiochip_remove(&ucb->gc);
|
|
+ iounmap(ucb->ts_base);
|
|
+ return err;
|
|
+}
|
|
+
|
|
+static const struct of_device_id __maybe_unused brcmvirt_gpio_ids[] = {
|
|
+ { .compatible = "brcm,bcm2835-virtgpio" },
|
|
+ { }
|
|
+};
|
|
+MODULE_DEVICE_TABLE(of, brcmvirt_gpio_ids);
|
|
+
|
|
+static struct platform_driver brcmvirt_gpio_driver = {
|
|
+ .driver = {
|
|
+ .name = MODULE_NAME,
|
|
+ .owner = THIS_MODULE,
|
|
+ .of_match_table = of_match_ptr(brcmvirt_gpio_ids),
|
|
+ },
|
|
+ .probe = brcmvirt_gpio_probe,
|
|
+ .remove = brcmvirt_gpio_remove,
|
|
+};
|
|
+module_platform_driver(brcmvirt_gpio_driver);
|
|
+
|
|
+MODULE_LICENSE("GPL");
|
|
+MODULE_AUTHOR("Dom Cobley <popcornmix@gmail.com>");
|
|
+MODULE_DESCRIPTION("brcmvirt GPIO driver");
|
|
+MODULE_ALIAS("platform:brcmvirt-gpio");
|
|
--- a/include/soc/bcm2835/raspberrypi-firmware.h
|
|
+++ b/include/soc/bcm2835/raspberrypi-firmware.h
|
|
@@ -93,6 +93,7 @@ enum rpi_firmware_property_tag {
|
|
RPI_FIRMWARE_FRAMEBUFFER_GET_OVERSCAN = 0x0004000a,
|
|
RPI_FIRMWARE_FRAMEBUFFER_GET_PALETTE = 0x0004000b,
|
|
RPI_FIRMWARE_FRAMEBUFFER_GET_TOUCHBUF = 0x0004000f,
|
|
+ RPI_FIRMWARE_FRAMEBUFFER_GET_GPIOVIRTBUF = 0x00040010,
|
|
RPI_FIRMWARE_FRAMEBUFFER_RELEASE = 0x00048001,
|
|
RPI_FIRMWARE_FRAMEBUFFER_TEST_PHYSICAL_WIDTH_HEIGHT = 0x00044003,
|
|
RPI_FIRMWARE_FRAMEBUFFER_TEST_VIRTUAL_WIDTH_HEIGHT = 0x00044004,
|