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gerrit.devboardsforandroid.linaro.org / platform / external / u-boot / d024236e5a31a2b4b82cbcc98b31b8170fc88d28 / . / drivers / gpio / mvebu_gpio.c
blob: 79942ff76a363d541a3aa63dba3c0c6d8664f3d4 [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
Stefan Roese704d9a62016-02-12 13:46:50 +0100[diff] [blame]13#define MVEBU_GPIOS_PER_BANK 32
14
15struct mvebu_gpio_regs {
16 u32 data_out;
17 u32 io_conf;
18 u32 blink_en;
19 u32 in_pol;
20 u32 data_in;
21};
22
23struct mvebu_gpio_priv {
24 struct mvebu_gpio_regs *regs;
25 char name[2];
26};
27
28static int mvebu_gpio_direction_input(struct udevice *dev, unsigned int gpio)
29{
30 struct mvebu_gpio_priv *priv = dev_get_priv(dev);
31 struct mvebu_gpio_regs *regs = priv->regs;
32
33 setbits_le32(&regs->io_conf, BIT(gpio));
34
35 return 0;
36}
37
38static int mvebu_gpio_direction_output(struct udevice *dev, unsigned gpio,
39 int value)
40{
41 struct mvebu_gpio_priv *priv = dev_get_priv(dev);
42 struct mvebu_gpio_regs *regs = priv->regs;
43
Stefan Roeseb23005c2016-04-07 07:41:00 +0200[diff] [blame]44 if (value)
45 setbits_le32(&regs->data_out, BIT(gpio));
46 else
47 clrbits_le32(&regs->data_out, BIT(gpio));
Stefan Roese704d9a62016-02-12 13:46:50 +0100[diff] [blame]48 clrbits_le32(&regs->io_conf, BIT(gpio));
49
50 return 0;
51}
52
53static int mvebu_gpio_get_function(struct udevice *dev, unsigned gpio)
54{
55 struct mvebu_gpio_priv *priv = dev_get_priv(dev);
56 struct mvebu_gpio_regs *regs = priv->regs;
57 u32 val;
58
59 val = readl(&regs->io_conf) & BIT(gpio);
60 if (val)
61 return GPIOF_INPUT;
62 else
63 return GPIOF_OUTPUT;
64}
65
66static int mvebu_gpio_set_value(struct udevice *dev, unsigned gpio,
67 int value)
68{
69 struct mvebu_gpio_priv *priv = dev_get_priv(dev);
70 struct mvebu_gpio_regs *regs = priv->regs;
71
72 if (value)
73 setbits_le32(&regs->data_out, BIT(gpio));
74 else
75 clrbits_le32(&regs->data_out, BIT(gpio));
76
77 return 0;
78}
79
80static int mvebu_gpio_get_value(struct udevice *dev, unsigned gpio)
81{
82 struct mvebu_gpio_priv *priv = dev_get_priv(dev);
83 struct mvebu_gpio_regs *regs = priv->regs;
84
85 return !!(readl(&regs->data_in) & BIT(gpio));
86}
87
88static int mvebu_gpio_probe(struct udevice *dev)
89{
90 struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
91 struct mvebu_gpio_priv *priv = dev_get_priv(dev);
92
Simon Glassa821c4a2017-05-17 17:18:05 -0600[diff] [blame]93 priv->regs = (struct mvebu_gpio_regs *)devfdt_get_addr(dev);
Stefan Roese704d9a62016-02-12 13:46:50 +0100[diff] [blame]94 uc_priv->gpio_count = MVEBU_GPIOS_PER_BANK;
95 priv->name[0] = 'A' + dev->req_seq;
96 uc_priv->bank_name = priv->name;
97
98 return 0;
99}
100
101static const struct dm_gpio_ops mvebu_gpio_ops = {
102 .direction_input = mvebu_gpio_direction_input,
103 .direction_output = mvebu_gpio_direction_output,
104 .get_function = mvebu_gpio_get_function,
105 .get_value = mvebu_gpio_get_value,
106 .set_value = mvebu_gpio_set_value,
107};
108
109static const struct udevice_id mvebu_gpio_ids[] = {
110 { .compatible = "marvell,orion-gpio" },
111 { }
112};
113
114U_BOOT_DRIVER(gpio_mvebu) = {
115 .name = "gpio_mvebu",
116 .id = UCLASS_GPIO,
117 .of_match = mvebu_gpio_ids,
118 .ops = &mvebu_gpio_ops,
119 .probe = mvebu_gpio_probe,
120 .priv_auto_alloc_size = sizeof(struct mvebu_gpio_priv),
121};