brcm63xx: probe gpio controllers through DT
[openwrt/svn-archive/archive.git] / target / linux / brcm63xx / patches-3.18 / 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 @@ -892,6 +892,14 @@ 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 @@ -19,6 +19,7 @@ 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 + dat_r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
91 + dirout_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");