diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.19/950-0090-bcm2835-virtgpio-Virtual-GPIO-driver.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.19/950-0090-bcm2835-virtgpio-Virtual-GPIO-driver.patch | 256 |
1 files changed, 256 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.19/950-0090-bcm2835-virtgpio-Virtual-GPIO-driver.patch b/target/linux/brcm2708/patches-4.19/950-0090-bcm2835-virtgpio-Virtual-GPIO-driver.patch new file mode 100644 index 0000000000..8aee6c7840 --- /dev/null +++ b/target/linux/brcm2708/patches-4.19/950-0090-bcm2835-virtgpio-Virtual-GPIO-driver.patch @@ -0,0 +1,256 @@ +From ae7c0b0955e96a7231ad4b6d909124fa7f7713e8 Mon Sep 17 00:00:00 2001 +From: popcornmix <popcornmix@gmail.com> +Date: Tue, 23 Feb 2016 19:56:04 +0000 +Subject: [PATCH 090/703] bcm2835-virtgpio: Virtual GPIO driver + +Add a virtual GPIO driver that uses the firmware mailbox interface to +request that the VPU toggles LEDs. +--- + drivers/gpio/Kconfig | 6 + + drivers/gpio/Makefile | 1 + + drivers/gpio/gpio-bcm-virt.c | 214 +++++++++++++++++++++++++++++++++++ + 3 files changed, 221 insertions(+) + create mode 100644 drivers/gpio/gpio-bcm-virt.c + +--- a/drivers/gpio/Kconfig ++++ b/drivers/gpio/Kconfig +@@ -151,6 +151,12 @@ 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 || COMPILE_TEST) ++ help ++ Turn on virtual GPIO support for Broadcom BCM283X chips. ++ + config GPIO_BRCMSTB + tristate "BRCMSTB GPIO support" + default y if (ARCH_BRCMSTB || BMIPS_GENERIC) +--- a/drivers/gpio/Makefile ++++ b/drivers/gpio/Makefile +@@ -35,6 +35,7 @@ obj-$(CONFIG_GPIO_ASPEED) += gpio-aspeed + obj-$(CONFIG_GPIO_RASPBERRYPI_EXP) += gpio-raspberrypi-exp.o + obj-$(CONFIG_GPIO_BCM_KONA) += gpio-bcm-kona.o + obj-$(CONFIG_GPIO_BD9571MWV) += gpio-bd9571mwv.o ++obj-$(CONFIG_GPIO_BCM_VIRT) += gpio-bcm-virt.o + obj-$(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 +1,214 @@ ++/* ++ * 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/platform_device.h> ++#include <linux/dma-mapping.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]; ++ dma_addr_t bus_addr; ++}; ++ ++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) ++{ ++ 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 brcmvirt_gpio *ucb; ++ u32 gpiovirtbuf; ++ ++ 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) { ++ err = -EINVAL; ++ goto out; ++ } ++ ++ ucb->ts_base = dma_zalloc_coherent(dev, PAGE_SIZE, &ucb->bus_addr, GFP_KERNEL); ++ if (!ucb->ts_base) { ++ pr_err("[%s]: failed to dma_alloc_coherent(%ld)\n", ++ __func__, PAGE_SIZE); ++ err = -ENOMEM; ++ goto out; ++ } ++ ++ gpiovirtbuf = (u32)ucb->bus_addr; ++ err = rpi_firmware_property(fw, RPI_FIRMWARE_FRAMEBUFFER_SET_GPIOVIRTBUF, ++ &gpiovirtbuf, sizeof(gpiovirtbuf)); ++ ++ if (err || gpiovirtbuf != 0) { ++ dev_warn(dev, "Failed to set gpiovirtbuf, trying to get err:%x\n", err); ++ dma_free_coherent(dev, PAGE_SIZE, ucb->ts_base, ucb->bus_addr); ++ ucb->ts_base = 0; ++ ucb->bus_addr = 0; ++ } ++ ++ if (!ucb->ts_base) { ++ err = rpi_firmware_property(fw, RPI_FIRMWARE_FRAMEBUFFER_GET_GPIOVIRTBUF, ++ &gpiovirtbuf, sizeof(gpiovirtbuf)); ++ ++ if (err) { ++ dev_err(dev, "Failed to get gpiovirtbuf\n"); ++ goto out; ++ } ++ ++ if (!gpiovirtbuf) { ++ dev_err(dev, "No virtgpio buffer\n"); ++ err = -ENOENT; ++ goto out; ++ } ++ ++ // 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 out; ++ } ++ ucb->bus_addr = 0; ++ } ++ 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 out; ++ ++ platform_set_drvdata(pdev, ucb); ++ ++ return 0; ++out: ++ if (ucb->bus_addr) { ++ dma_free_coherent(dev, PAGE_SIZE, ucb->ts_base, ucb->bus_addr); ++ ucb->bus_addr = 0; ++ ucb->ts_base = NULL; ++ } else if (ucb->ts_base) { ++ iounmap(ucb->ts_base); ++ ucb->ts_base = NULL; ++ } ++ return err; ++} ++ ++static int brcmvirt_gpio_remove(struct platform_device *pdev) ++{ ++ struct device *dev = &pdev->dev; ++ int err = 0; ++ struct brcmvirt_gpio *ucb = platform_get_drvdata(pdev); ++ ++ gpiochip_remove(&ucb->gc); ++ if (ucb->bus_addr) ++ dma_free_coherent(dev, PAGE_SIZE, ucb->ts_base, ucb->bus_addr); ++ else if (ucb->ts_base) ++ 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"); |