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gerrit.devboardsforandroid.linaro.org / platform / external / u-boot / 4886de76080a970a7153ab802cd083f0a97eb115 / . / drivers / gpio / dwapb_gpio.c
blob: 471e18aeaa0b3c54091a100214dab6ab735ff69c [file] [log] [blame]
Marek Vasute30a70c2015-06-23 15:54:19 +0200[diff] [blame]1/*
2 * (C) Copyright 2015 Marek Vasut <marex@denx.de>
3 *
4 * DesignWare APB GPIO driver
5 *
6 * SPDX-License-Identifier: GPL-2.0+
7 */
8
9#include <common.h>
10#include <malloc.h>
11#include <asm/arch/gpio.h>
12#include <asm/gpio.h>
13#include <asm/io.h>
14#include <dm.h>
15#include <dm/device-internal.h>
16#include <dm/lists.h>
17#include <dm/root.h>
18#include <errno.h>
19
20DECLARE_GLOBAL_DATA_PTR;
21
22#define GPIO_SWPORTA_DR 0x00
23#define GPIO_SWPORTA_DDR 0x04
24#define GPIO_INTEN 0x30
25#define GPIO_INTMASK 0x34
26#define GPIO_INTTYPE_LEVEL 0x38
27#define GPIO_INT_POLARITY 0x3c
28#define GPIO_INTSTATUS 0x40
29#define GPIO_PORTA_DEBOUNCE 0x48
30#define GPIO_PORTA_EOI 0x4c
31#define GPIO_EXT_PORTA 0x50
32
33struct gpio_dwapb_platdata {
34 const char *name;
35 int bank;
36 int pins;
37 fdt_addr_t base;
38};
39
40static int dwapb_gpio_direction_input(struct udevice *dev, unsigned pin)
41{
42 struct gpio_dwapb_platdata *plat = dev_get_platdata(dev);
43
44 clrbits_le32(plat->base + GPIO_SWPORTA_DDR, 1 << pin);
45 return 0;
46}
47
48static int dwapb_gpio_direction_output(struct udevice *dev, unsigned pin,
49 int val)
50{
51 struct gpio_dwapb_platdata *plat = dev_get_platdata(dev);
52
53 setbits_le32(plat->base + GPIO_SWPORTA_DDR, 1 << pin);
54
55 if (val)
56 setbits_le32(plat->base + GPIO_SWPORTA_DR, 1 << pin);
57 else
58 clrbits_le32(plat->base + GPIO_SWPORTA_DR, 1 << pin);
59
60 return 0;
61}
62
63static int dwapb_gpio_get_value(struct udevice *dev, unsigned pin)
64{
65 struct gpio_dwapb_platdata *plat = dev_get_platdata(dev);
66 return !!(readl(plat->base + GPIO_EXT_PORTA) & (1 << pin));
67}
68
69
70static int dwapb_gpio_set_value(struct udevice *dev, unsigned pin, int val)
71{
72 struct gpio_dwapb_platdata *plat = dev_get_platdata(dev);
73
74 if (val)
75 setbits_le32(plat->base + GPIO_SWPORTA_DR, 1 << pin);
76 else
77 clrbits_le32(plat->base + GPIO_SWPORTA_DR, 1 << pin);
78
79 return 0;
80}
81
82static const struct dm_gpio_ops gpio_dwapb_ops = {
83 .direction_input = dwapb_gpio_direction_input,
84 .direction_output = dwapb_gpio_direction_output,
85 .get_value = dwapb_gpio_get_value,
86 .set_value = dwapb_gpio_set_value,
87};
88
89static int gpio_dwapb_probe(struct udevice *dev)
90{
91 struct gpio_dev_priv *priv = dev_get_uclass_priv(dev);
92 struct gpio_dwapb_platdata *plat = dev->platdata;
93
94 if (!plat)
95 return 0;
96
97 priv->gpio_count = plat->pins;
98 priv->bank_name = plat->name;
99
100 return 0;
101}
102
103static int gpio_dwapb_bind(struct udevice *dev)
104{
105 struct gpio_dwapb_platdata *plat = dev_get_platdata(dev);
106 const void *blob = gd->fdt_blob;
107 struct udevice *subdev;
108 fdt_addr_t base;
109 int ret, node, bank = 0;
110
111 /* If this is a child device, there is nothing to do here */
112 if (plat)
113 return 0;
114
115 base = fdtdec_get_addr(blob, dev->of_offset, "reg");
116 if (base == FDT_ADDR_T_NONE) {
117 debug("Can't get the GPIO register base address\n");
118 return -ENXIO;
119 }
120
121 for (node = fdt_first_subnode(blob, dev->of_offset);
122 node > 0;
123 node = fdt_next_subnode(blob, node)) {
124 if (!fdtdec_get_bool(blob, node, "gpio-controller"))
125 continue;
126
127 plat = NULL;
128 plat = calloc(1, sizeof(*plat));
129 if (!plat)
130 return -ENOMEM;
131
132 plat->base = base;
133 plat->bank = bank;
134 plat->pins = fdtdec_get_int(blob, node, "snps,nr-gpios", 0);
Simon Glassb02e4042016-10-02 17:59:28 -0600[diff] [blame]135 plat->name = fdt_stringlist_get(blob, node, "bank-name", 0,
136 NULL);
Marek Vasute30a70c2015-06-23 15:54:19 +0200[diff] [blame]137 if (ret)
138 goto err;
139
140 ret = device_bind(dev, dev->driver, plat->name,
141 plat, -1, &subdev);
142 if (ret)
143 goto err;
144
145 subdev->of_offset = node;
146 bank++;
147 }
148
149 return 0;
150
151err:
152 free(plat);
153 return ret;
154}
155
156static const struct udevice_id gpio_dwapb_ids[] = {
157 { .compatible = "snps,dw-apb-gpio" },
158 { }
159};
160
161U_BOOT_DRIVER(gpio_dwapb) = {
162 .name = "gpio-dwapb",
163 .id = UCLASS_GPIO,
164 .of_match = gpio_dwapb_ids,
165 .ops = &gpio_dwapb_ops,
166 .bind = gpio_dwapb_bind,
167 .probe = gpio_dwapb_probe,
168};