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179 lines
4.9 KiB
Diff
179 lines
4.9 KiB
Diff
From dbe94a8daaa63ef81b7414f2a17bca8e36dd6daa Mon Sep 17 00:00:00 2001
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From: Jonas Gorski <jogo@openwrt.org>
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Date: Fri, 20 Feb 2015 19:55:32 +0100
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Subject: [PATCH 1/6] gpio: add a simple GPIO driver for bcm63xx
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Signed-off-by: Jonas Gorski <jogo@openwrt.org>
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---
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drivers/gpio/Kconfig | 8 +++
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drivers/gpio/Makefile | 1 +
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drivers/gpio/gpio-bcm63xx.c | 135 +++++++++++++++++++++++++++++++++++++++++++
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3 files changed, 131 insertions(+)
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create mode 100644 drivers/gpio/gpio-bcm63xx.c
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--- a/drivers/gpio/Kconfig
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+++ b/drivers/gpio/Kconfig
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@@ -147,6 +147,13 @@ config GPIO_BCM_KONA
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help
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Turn on GPIO support for Broadcom "Kona" chips.
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+config GPIO_BCM63XX
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+ bool "Broadcom BCM63XX GPIO"
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+ depends on MIPS || COMPILE_TEST
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+ select GPIO_GENERIC
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+ help
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+ Turn on GPIO support for Broadcom BCM63XX xDSL chips.
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+
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config GPIO_BRCMSTB
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tristate "BRCMSTB GPIO support"
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default y if (ARCH_BRCMSTB || BMIPS_GENERIC)
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--- a/drivers/gpio/Makefile
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+++ b/drivers/gpio/Makefile
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@@ -34,6 +34,7 @@ obj-$(CONFIG_GPIO_ARIZONA) += gpio-ariz
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obj-$(CONFIG_GPIO_ASPEED) += gpio-aspeed.o
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obj-$(CONFIG_GPIO_ATH79) += gpio-ath79.o
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obj-$(CONFIG_GPIO_BCM_KONA) += gpio-bcm-kona.o
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+obj-$(CONFIG_GPIO_BCM63XX) += gpio-bcm63xx.o
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obj-$(CONFIG_GPIO_BD70528) += gpio-bd70528.o
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obj-$(CONFIG_GPIO_BD9571MWV) += gpio-bd9571mwv.o
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obj-$(CONFIG_GPIO_BRCMSTB) += gpio-brcmstb.o
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--- /dev/null
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+++ b/drivers/gpio/gpio-bcm63xx.c
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@@ -0,0 +1,135 @@
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+/*
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+ * Driver for BCM63XX memory-mapped GPIO controllers, based on
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+ * Generic driver for memory-mapped GPIO controllers.
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+ *
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+ * Copyright 2008 MontaVista Software, Inc.
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+ * Copyright 2008,2010 Anton Vorontsov <cbouatmailru@gmail.com>
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+ * Copyright 2015 Jonas Gorski <jogo@openwrt.org>
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+ *
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+ * This program is free software; you can redistribute it and/or modify it
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+ * under the terms of the GNU General Public License as published by the
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+ * Free Software Foundation; either version 2 of the License, or (at your
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+ * option) any later version.
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+ */
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+
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+#include <linux/init.h>
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+#include <linux/err.h>
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+#include <linux/bug.h>
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+#include <linux/kernel.h>
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+#include <linux/module.h>
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+#include <linux/spinlock.h>
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+#include <linux/compiler.h>
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+#include <linux/types.h>
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+#include <linux/errno.h>
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+#include <linux/log2.h>
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+#include <linux/ioport.h>
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+#include <linux/io.h>
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+#include <linux/gpio.h>
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+#include <linux/gpio/driver.h>
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+#include <linux/slab.h>
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+#include <linux/platform_device.h>
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+#include <linux/mod_devicetable.h>
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+#include <linux/of.h>
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+#include <linux/of_irq.h>
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+#include <linux/of_gpio.h>
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+
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+static int bcm63xx_gpio_to_irq(struct gpio_chip *chip, unsigned gpio)
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+{
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+ char irq_name[7]; /* "gpioXX" */
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+
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+ sprintf(irq_name, "gpio%d", gpio);
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+ return of_irq_get_byname(chip->of_node, irq_name);
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+}
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+
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+static int bcm63xx_gpio_probe(struct platform_device *pdev)
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+{
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+ struct device *dev = &pdev->dev;
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+ struct resource *dat_r, *dirout_r;
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+ void __iomem *dat;
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+ void __iomem *dirout;
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+ unsigned long sz;
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+ int err;
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+ struct gpio_chip *gc;
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+ struct bgpio_pdata *pdata = dev_get_platdata(dev);
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+
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+ dirout_r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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+ dat_r = platform_get_resource(pdev, IORESOURCE_MEM, 1);
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+ if (!dat_r || !dirout_r)
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+ return -EINVAL;
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+
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+ if (resource_size(dat_r) != resource_size(dirout_r))
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+ return -EINVAL;
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+
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+ sz = resource_size(dat_r);
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+
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+ dat = devm_ioremap_resource(dev, dat_r);
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+ if (IS_ERR(dat))
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+ return PTR_ERR(dat);
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+
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+ dirout = devm_ioremap_resource(dev, dirout_r);
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+ if (IS_ERR(dirout))
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+ return PTR_ERR(dirout);
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+
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+ gc = devm_kzalloc(&pdev->dev, sizeof(*gc), GFP_KERNEL);
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+ if (!gc)
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+ return -ENOMEM;
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+
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+ err = bgpio_init(gc, dev, sz, dat, NULL, NULL, dirout, NULL,
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+ BGPIOF_BIG_ENDIAN_BYTE_ORDER);
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+ if (err)
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+ return err;
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+
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+ platform_set_drvdata(pdev, gc);
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+
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+ if (dev->of_node) {
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+ int id = of_alias_get_id(dev->of_node, "gpio");
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+ u32 ngpios;
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+
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+ if (id >= 0)
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+ gc->label = devm_kasprintf(dev, GFP_KERNEL,
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+ "bcm63xx-gpio.%d", id);
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+
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+ if (!of_property_read_u32(dev->of_node, "ngpios", &ngpios))
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+ gc->ngpio = ngpios;
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+
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+ if (of_get_property(dev->of_node, "interrupt-names", NULL))
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+ gc->to_irq = bcm63xx_gpio_to_irq;
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+
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+ } else if (pdata) {
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+ gc->base = pdata->base;
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+ if (pdata->ngpio > 0)
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+ gc->ngpio = pdata->ngpio;
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+ }
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+
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+ return gpiochip_add(gc);
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+}
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+
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+static int bcm63xx_gpio_remove(struct platform_device *pdev)
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+{
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+ struct gpio_chip *gc = platform_get_drvdata(pdev);
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+
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+ gpiochip_remove(gc);
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+ return 0;
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+}
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+
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+#ifdef CONFIG_OF
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+static struct of_device_id bcm63xx_gpio_of_match[] = {
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+ { .compatible = "brcm,bcm6345-gpio" },
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+ { },
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+};
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+#endif
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+
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+static struct platform_driver bcm63xx_gpio_driver = {
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+ .probe = bcm63xx_gpio_probe,
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+ .remove = bcm63xx_gpio_remove,
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+ .driver = {
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+ .name = "bcm63xx-gpio",
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+ .of_match_table = of_match_ptr(bcm63xx_gpio_of_match),
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+ },
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+};
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+
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+module_platform_driver(bcm63xx_gpio_driver);
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+
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+MODULE_DESCRIPTION("Driver for BCM63XX memory-mapped GPIO controllers");
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+MODULE_AUTHOR("Jonas Gorski <jogo@openwrt.org>");
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+MODULE_LICENSE("GPL");
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