target/linux/brcm63xx/patches-3.14/374-gpio-add-a-simple-GPIO-driver-for-bcm63xx.patch

   1 From dbe94a8daaa63ef81b7414f2a17bca8e36dd6daa Mon Sep 17 00:00:00 2001
   2 From: Jonas Gorski <jogo@openwrt.org>
   3 Date: Fri, 20 Feb 2015 19:55:32 +0100
   4 Subject: [PATCH 1/6] gpio: add a simple GPIO driver for bcm63xx
   5
   6
   7 Signed-off-by: Jonas Gorski <jogo@openwrt.org>
   8 ---
   9  drivers/gpio/Kconfig        |    8 +++
  10  drivers/gpio/Makefile       |    1 +
  11  drivers/gpio/gpio-bcm63xx.c |  117 +++++++++++++++++++++++++++++++++++++++++++
  12  3 files changed, 126 insertions(+)
  13  create mode 100644 drivers/gpio/gpio-bcm63xx.c
  14
  15 --- a/drivers/gpio/Kconfig
  16 +++ b/drivers/gpio/Kconfig
  17 @@ -821,6 +821,14 @@ config GPIO_BCM_KONA
  18         help
  19           Turn on GPIO support for Broadcom "Kona" chips.
  20
  21 +config GPIO_BCM63XX
  22 +       bool "Broadcom BCM63XX GPIO"
  23 +       depends on MIPS || COMPILE_TEST
  24 +       select GPIO_GENERIC
  25 +       help
  26 +         Turn on GPIO support for Broadcom BCM63XX xDSL chips.
  27 +
  28 +
  29  comment "USB GPIO expanders:"
  30
  31  config GPIO_VIPERBOARD
  32 --- a/drivers/gpio/Makefile
  33 +++ b/drivers/gpio/Makefile
  34 @@ -17,6 +17,7 @@ obj-$(CONFIG_GPIO_ADP5588)    += gpio-adp55
  35  obj-$(CONFIG_GPIO_AMD8111)     += gpio-amd8111.o
  36  obj-$(CONFIG_GPIO_ARIZONA)     += gpio-arizona.o
  37  obj-$(CONFIG_GPIO_BCM_KONA)    += gpio-bcm-kona.o
  38 +obj-$(CONFIG_GPIO_BCM63XX)     += gpio-bcm63xx.o
  39  obj-$(CONFIG_GPIO_BT8XX)       += gpio-bt8xx.o
  40  obj-$(CONFIG_GPIO_CLPS711X)    += gpio-clps711x.o
  41  obj-$(CONFIG_GPIO_CS5535)      += gpio-cs5535.o
  42 --- /dev/null
  43 +++ b/drivers/gpio/gpio-bcm63xx.c
  44 @@ -0,0 +1,117 @@
  45 +/*
  46 + * Driver for BCM63XX memory-mapped GPIO controllers, based on
  47 + * Generic driver for memory-mapped GPIO controllers.
  48 + *
  49 + * Copyright 2008 MontaVista Software, Inc.
  50 + * Copyright 2008,2010 Anton Vorontsov <cbouatmailru@gmail.com>
  51 + * Copyright 2015 Jonas Gorski <jogo@openwrt.org>
  52 + *
  53 + * This program is free software; you can redistribute  it and/or modify it
  54 + * under  the terms of  the GNU General  Public License as published by the
  55 + * Free Software Foundation;  either version 2 of the  License, or (at your
  56 + * option) any later version.
  57 + */
  58 +
  59 +#include <linux/init.h>
  60 +#include <linux/err.h>
  61 +#include <linux/bug.h>
  62 +#include <linux/kernel.h>
  63 +#include <linux/module.h>
  64 +#include <linux/spinlock.h>
  65 +#include <linux/compiler.h>
  66 +#include <linux/types.h>
  67 +#include <linux/errno.h>
  68 +#include <linux/log2.h>
  69 +#include <linux/ioport.h>
  70 +#include <linux/io.h>
  71 +#include <linux/gpio.h>
  72 +#include <linux/slab.h>
  73 +#include <linux/platform_device.h>
  74 +#include <linux/mod_devicetable.h>
  75 +#include <linux/basic_mmio_gpio.h>
  76 +#include <linux/of.h>
  77 +#include <linux/of_gpio.h>
  78 +
  79 +static int bcm63xx_gpio_probe(struct platform_device *pdev)
  80 +{
  81 +       struct device *dev = &pdev->dev;
  82 +       struct resource *dat_r, *dirout_r;
  83 +       void __iomem *dat;
  84 +       void __iomem *dirout;
  85 +       unsigned long sz;
  86 +       int err;
  87 +       struct bgpio_chip *bgc;
  88 +       struct bgpio_pdata *pdata = dev_get_platdata(dev);
  89 +
  90 +       dirout_r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  91 +       dat_r = platform_get_resource(pdev, IORESOURCE_MEM, 1);
  92 +       if (!dat_r || !dirout_r)
  93 +               return -EINVAL;
  94 +
  95 +       if (resource_size(dat_r) != resource_size(dirout_r))
  96 +               return -EINVAL;
  97 +
  98 +       sz = resource_size(dat_r);
  99 +
 100 +       dat = devm_ioremap_resource(dev, dat_r);
 101 +       if (IS_ERR(dat))
 102 +               return PTR_ERR(dat);
 103 +
 104 +       dirout = devm_ioremap_resource(dev, dirout_r);
 105 +       if (IS_ERR(dirout))
 106 +               return PTR_ERR(dirout);
 107 +
 108 +       bgc = devm_kzalloc(&pdev->dev, sizeof(*bgc), GFP_KERNEL);
 109 +       if (!bgc)
 110 +               return -ENOMEM;
 111 +
 112 +       err = bgpio_init(bgc, dev, sz, dat, NULL, NULL, dirout, NULL,
 113 +                        BGPIOF_BIG_ENDIAN_BYTE_ORDER);
 114 +       if (err)
 115 +               return err;
 116 +
 117 +       platform_set_drvdata(pdev, bgc);
 118 +
 119 +       if (dev->of_node) {
 120 +               u32 ngpios;
 121 +
 122 +               if (!of_property_read_u32(dev->of_node, "ngpios", &ngpios))
 123 +                       bgc->gc.ngpio = ngpios;
 124 +
 125 +       } else if (pdata) {
 126 +               bgc->gc.base = pdata->base;
 127 +               if (pdata->ngpio > 0)
 128 +                       bgc->gc.ngpio = pdata->ngpio;
 129 +       }
 130 +
 131 +       return gpiochip_add(&bgc->gc);
 132 +}
 133 +
 134 +static int bcm63xx_gpio_remove(struct platform_device *pdev)
 135 +{
 136 +       struct bgpio_chip *bgc = platform_get_drvdata(pdev);
 137 +
 138 +       return bgpio_remove(bgc);
 139 +}
 140 +
 141 +#ifdef CONFIG_OF
 142 +static struct of_device_id bcm63xx_gpio_of_match[] = {
 143 +       { .compatible = "brcm,bcm6345-gpio" },
 144 +       { },
 145 +};
 146 +#endif
 147 +
 148 +static struct platform_driver bcm63xx_gpio_driver = {
 149 +       .probe = bcm63xx_gpio_probe,
 150 +       .remove = bcm63xx_gpio_remove,
 151 +       .driver = {
 152 +               .name = "bcm63xx-gpio",
 153 +               .of_match_table = of_match_ptr(bcm63xx_gpio_of_match),
 154 +       },
 155 +};
 156 +
 157 +module_platform_driver(bcm63xx_gpio_driver);
 158 +
 159 +MODULE_DESCRIPTION("Driver for BCM63XX memory-mapped GPIO controllers");
 160 +MODULE_AUTHOR("Jonas Gorski <jogo@openwrt.org>");
 161 +MODULE_LICENSE("GPL");