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gerrit.cesnet.cz / github / trini / u-boot / 99de254e8de9a73ac6baee05786e2e3f70e4813b / . / drivers / gpio / mvebu_gpio.c
blob: 9564ce2b13ea9f313f006d5e6a5448fad36bbd76 [file] [log] [blame]
Stefan Roese704d9a62016-02-12 13:46:50 +0100[diff] [blame]1/*
2 * Copyright (C) 2016 Stefan Roese <sr@denx.de>
3 *
4 * SPDX-License-Identifier: GPL-2.0+
5 */
6
7#include <common.h>
8#include <dm.h>
9#include <asm/gpio.h>
10#include <asm/io.h>
11#include <errno.h>
12
13DECLARE_GLOBAL_DATA_PTR;
14
15#define MVEBU_GPIOS_PER_BANK 32
16
17struct mvebu_gpio_regs {
18 u32 data_out;
19 u32 io_conf;
20 u32 blink_en;
21 u32 in_pol;
22 u32 data_in;
23};
24
25struct mvebu_gpio_priv {
26 struct mvebu_gpio_regs *regs;
27 char name[2];
28};
29
30static int mvebu_gpio_direction_input(struct udevice *dev, unsigned int gpio)
31{
32 struct mvebu_gpio_priv *priv = dev_get_priv(dev);
33 struct mvebu_gpio_regs *regs = priv->regs;
34
35 setbits_le32(&regs->io_conf, BIT(gpio));
36
37 return 0;
38}
39
40static int mvebu_gpio_direction_output(struct udevice *dev, unsigned gpio,
41 int value)
42{
43 struct mvebu_gpio_priv *priv = dev_get_priv(dev);
44 struct mvebu_gpio_regs *regs = priv->regs;
45
46 clrbits_le32(&regs->io_conf, BIT(gpio));
47
48 return 0;
49}
50
51static int mvebu_gpio_get_function(struct udevice *dev, unsigned gpio)
52{
53 struct mvebu_gpio_priv *priv = dev_get_priv(dev);
54 struct mvebu_gpio_regs *regs = priv->regs;
55 u32 val;
56
57 val = readl(&regs->io_conf) & BIT(gpio);
58 if (val)
59 return GPIOF_INPUT;
60 else
61 return GPIOF_OUTPUT;
62}
63
64static int mvebu_gpio_set_value(struct udevice *dev, unsigned gpio,
65 int value)
66{
67 struct mvebu_gpio_priv *priv = dev_get_priv(dev);
68 struct mvebu_gpio_regs *regs = priv->regs;
69
70 if (value)
71 setbits_le32(&regs->data_out, BIT(gpio));
72 else
73 clrbits_le32(&regs->data_out, BIT(gpio));
74
75 return 0;
76}
77
78static int mvebu_gpio_get_value(struct udevice *dev, unsigned gpio)
79{
80 struct mvebu_gpio_priv *priv = dev_get_priv(dev);
81 struct mvebu_gpio_regs *regs = priv->regs;
82
83 return !!(readl(&regs->data_in) & BIT(gpio));
84}
85
86static int mvebu_gpio_probe(struct udevice *dev)
87{
88 struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
89 struct mvebu_gpio_priv *priv = dev_get_priv(dev);
90
91 priv->regs = (struct mvebu_gpio_regs *)dev_get_addr(dev);
92 uc_priv->gpio_count = MVEBU_GPIOS_PER_BANK;
93 priv->name[0] = 'A' + dev->req_seq;
94 uc_priv->bank_name = priv->name;
95
96 return 0;
97}
98
99static const struct dm_gpio_ops mvebu_gpio_ops = {
100 .direction_input = mvebu_gpio_direction_input,
101 .direction_output = mvebu_gpio_direction_output,
102 .get_function = mvebu_gpio_get_function,
103 .get_value = mvebu_gpio_get_value,
104 .set_value = mvebu_gpio_set_value,
105};
106
107static const struct udevice_id mvebu_gpio_ids[] = {
108 { .compatible = "marvell,orion-gpio" },
109 { }
110};
111
112U_BOOT_DRIVER(gpio_mvebu) = {
113 .name = "gpio_mvebu",
114 .id = UCLASS_GPIO,
115 .of_match = mvebu_gpio_ids,
116 .ops = &mvebu_gpio_ops,
117 .probe = mvebu_gpio_probe,
118 .priv_auto_alloc_size = sizeof(struct mvebu_gpio_priv),
119};