diff options
Diffstat (limited to 'target/linux/bcm27xx/patches-5.4/950-0082-bcm2835-virtgpio-Virtual-GPIO-driver.patch')
| -rw-r--r-- | target/linux/bcm27xx/patches-5.4/950-0082-bcm2835-virtgpio-Virtual-GPIO-driver.patch | 256 |
1 files changed, 0 insertions, 256 deletions
diff --git a/target/linux/bcm27xx/patches-5.4/950-0082-bcm2835-virtgpio-Virtual-GPIO-driver.patch b/target/linux/bcm27xx/patches-5.4/950-0082-bcm2835-virtgpio-Virtual-GPIO-driver.patch deleted file mode 100644 index 610f46cbb9..0000000000 --- a/target/linux/bcm27xx/patches-5.4/950-0082-bcm2835-virtgpio-Virtual-GPIO-driver.patch +++ /dev/null @@ -1,256 +0,0 @@ -From fce8ca644475a27f51c5c3c155f1786700b246c1 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. ---- - 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 -@@ -147,6 +147,12 @@ 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 -@@ -34,6 +34,7 @@ obj-$(CONFIG_GPIO_ARIZONA) += gpio-ariz - obj-$(CONFIG_GPIO_ASPEED) += gpio-aspeed.o - obj-$(CONFIG_GPIO_ATH79) += gpio-ath79.o - obj-$(CONFIG_GPIO_BCM_KONA) += gpio-bcm-kona.o -+obj-$(CONFIG_GPIO_BCM_VIRT) += gpio-bcm-virt.o - obj-$(CONFIG_GPIO_BD70528) += gpio-bd70528.o - obj-$(CONFIG_GPIO_BD9571MWV) += gpio-bd9571mwv.o - obj-$(CONFIG_GPIO_BRCMSTB) += gpio-brcmstb.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_alloc_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"); |