Gitiles
Code Review Sign In
gerrit.cesnet.cz / github / trini / u-boot / a7638833b38270c8b64c5c62f6c6ce144ef387c3 / . / drivers / gpio / gpio-uniphier.c
blob: 80bb16ec064227def48a5d2c05ad01e49cf31572 [file] [log] [blame]
Masahiro Yamadab9a66b62016-02-16 17:03:48 +0900[diff] [blame]1/*
2 * Copyright (C) 2016 Masahiro Yamada <yamada.masahiro@socionext.com>
3 *
4 * SPDX-License-Identifier: GPL-2.0+
5 */
6
7#include <common.h>
8#include <dm/device.h>
9#include <mapmem.h>
10#include <linux/bitops.h>
11#include <linux/io.h>
12#include <asm/errno.h>
13#include <asm/gpio.h>
14
15#define UNIPHIER_GPIO_PORTS_PER_BANK 8
16
17#define UNIPHIER_GPIO_REG_DATA 0 /* data */
18#define UNIPHIER_GPIO_REG_DIR 4 /* direction (1:in, 0:out) */
19
20struct uniphier_gpio_priv {
21 void __iomem *base;
22 char bank_name[16];
23};
24
25static void uniphier_gpio_offset_write(struct udevice *dev, unsigned offset,
26 unsigned reg, int value)
27{
28 struct uniphier_gpio_priv *priv = dev_get_priv(dev);
29 u32 tmp;
30
31 tmp = readl(priv->base + reg);
32 if (value)
33 tmp |= BIT(offset);
34 else
35 tmp &= ~BIT(offset);
36 writel(tmp, priv->base + reg);
37}
38
39static int uniphier_gpio_offset_read(struct udevice *dev, unsigned offset,
40 unsigned reg)
41{
42 struct uniphier_gpio_priv *priv = dev_get_priv(dev);
43
44 return !!(readl(priv->base + reg) & BIT(offset));
45}
46
47static int uniphier_gpio_direction_input(struct udevice *dev, unsigned offset)
48{
49 uniphier_gpio_offset_write(dev, offset, UNIPHIER_GPIO_REG_DIR, 1);
50
51 return 0;
52}
53
54static int uniphier_gpio_direction_output(struct udevice *dev, unsigned offset,
55 int value)
56{
57 uniphier_gpio_offset_write(dev, offset, UNIPHIER_GPIO_REG_DATA, value);
58 uniphier_gpio_offset_write(dev, offset, UNIPHIER_GPIO_REG_DIR, 0);
59
60 return 0;
61}
62
63static int uniphier_gpio_get_value(struct udevice *dev, unsigned offset)
64{
65 return uniphier_gpio_offset_read(dev, offset, UNIPHIER_GPIO_REG_DATA);
66}
67
68static int uniphier_gpio_set_value(struct udevice *dev, unsigned offset,
69 int value)
70{
71 uniphier_gpio_offset_write(dev, offset, UNIPHIER_GPIO_REG_DATA, value);
72
73 return 0;
74}
75
76static int uniphier_gpio_get_function(struct udevice *dev, unsigned offset)
77{
78 return uniphier_gpio_offset_read(dev, offset, UNIPHIER_GPIO_REG_DIR) ?
79 GPIOF_INPUT : GPIOF_OUTPUT;
80}
81
82static const struct dm_gpio_ops uniphier_gpio_ops = {
83 .direction_input = uniphier_gpio_direction_input,
84 .direction_output = uniphier_gpio_direction_output,
85 .get_value = uniphier_gpio_get_value,
86 .set_value = uniphier_gpio_set_value,
87 .get_function = uniphier_gpio_get_function,
88};
89
90static int uniphier_gpio_probe(struct udevice *dev)
91{
92 struct uniphier_gpio_priv *priv = dev_get_priv(dev);
93 struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
94 DECLARE_GLOBAL_DATA_PTR;
95 fdt_addr_t addr;
96 fdt_size_t size;
97 unsigned int tmp;
98
99 addr = fdtdec_get_addr_size(gd->fdt_blob, dev->of_offset, "reg",
100 &size);
101 if (addr == FDT_ADDR_T_NONE)
102 return -EINVAL;
103
104 priv->base = map_sysmem(addr, size);
105 if (!priv->base)
106 return -ENOMEM;
107
108 uc_priv->gpio_count = UNIPHIER_GPIO_PORTS_PER_BANK;
109
110 tmp = (addr & 0xfff);
111
112 /* Unfortunately, there is a register hole at offset 0x90-0x9f. */
113 if (tmp > 0x90)
114 tmp -= 0x10;
115
116 snprintf(priv->bank_name, sizeof(priv->bank_name) - 1,
117 "port%d-", (tmp - 8) / 8);
118
119 uc_priv->bank_name = priv->bank_name;
120
121 return 0;
122}
123
124static int uniphier_gpio_remove(struct udevice *dev)
125{
126 struct uniphier_gpio_priv *priv = dev_get_priv(dev);
127
128 unmap_sysmem(priv->base);
129
130 return 0;
131}
132
133/* .data = the number of GPIO banks */
134static const struct udevice_id uniphier_gpio_match[] = {
135 { .compatible = "socionext,uniphier-gpio" },
136 { /* sentinel */ }
137};
138
139U_BOOT_DRIVER(uniphier_gpio) = {
140 .name = "uniphier_gpio",
141 .id = UCLASS_GPIO,
142 .of_match = uniphier_gpio_match,
143 .probe = uniphier_gpio_probe,
144 .remove = uniphier_gpio_remove,
145 .priv_auto_alloc_size = sizeof(struct uniphier_gpio_priv),
146 .ops = &uniphier_gpio_ops,
147};