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gerrit.devboardsforandroid.linaro.org / platform / external / u-boot / b23005cec3b23a4ac8f7336a427febdddc6451e7 / . / drivers / gpio / mvebu_gpio.c
blob: 75dc73e5860b61be65e90ba165526e30ac6b009d [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
Stefan Roeseb23005c2016-04-07 07:41:00 +0200[diff] [blame^]46 if (value)
47 setbits_le32(&regs->data_out, BIT(gpio));
48 else
49 clrbits_le32(&regs->data_out, BIT(gpio));
Stefan Roese704d9a62016-02-12 13:46:50 +0100[diff] [blame]50 clrbits_le32(&regs->io_conf, BIT(gpio));
51
52 return 0;
53}
54
55static int mvebu_gpio_get_function(struct udevice *dev, unsigned gpio)
56{
57 struct mvebu_gpio_priv *priv = dev_get_priv(dev);
58 struct mvebu_gpio_regs *regs = priv->regs;
59 u32 val;
60
61 val = readl(&regs->io_conf) & BIT(gpio);
62 if (val)
63 return GPIOF_INPUT;
64 else
65 return GPIOF_OUTPUT;
66}
67
68static int mvebu_gpio_set_value(struct udevice *dev, unsigned gpio,
69 int value)
70{
71 struct mvebu_gpio_priv *priv = dev_get_priv(dev);
72 struct mvebu_gpio_regs *regs = priv->regs;
73
74 if (value)
75 setbits_le32(&regs->data_out, BIT(gpio));
76 else
77 clrbits_le32(&regs->data_out, BIT(gpio));
78
79 return 0;
80}
81
82static int mvebu_gpio_get_value(struct udevice *dev, unsigned gpio)
83{
84 struct mvebu_gpio_priv *priv = dev_get_priv(dev);
85 struct mvebu_gpio_regs *regs = priv->regs;
86
87 return !!(readl(&regs->data_in) & BIT(gpio));
88}
89
90static int mvebu_gpio_probe(struct udevice *dev)
91{
92 struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
93 struct mvebu_gpio_priv *priv = dev_get_priv(dev);
94
95 priv->regs = (struct mvebu_gpio_regs *)dev_get_addr(dev);
96 uc_priv->gpio_count = MVEBU_GPIOS_PER_BANK;
97 priv->name[0] = 'A' + dev->req_seq;
98 uc_priv->bank_name = priv->name;
99
100 return 0;
101}
102
103static const struct dm_gpio_ops mvebu_gpio_ops = {
104 .direction_input = mvebu_gpio_direction_input,
105 .direction_output = mvebu_gpio_direction_output,
106 .get_function = mvebu_gpio_get_function,
107 .get_value = mvebu_gpio_get_value,
108 .set_value = mvebu_gpio_set_value,
109};
110
111static const struct udevice_id mvebu_gpio_ids[] = {
112 { .compatible = "marvell,orion-gpio" },
113 { }
114};
115
116U_BOOT_DRIVER(gpio_mvebu) = {
117 .name = "gpio_mvebu",
118 .id = UCLASS_GPIO,
119 .of_match = mvebu_gpio_ids,
120 .ops = &mvebu_gpio_ops,
121 .probe = mvebu_gpio_probe,
122 .priv_auto_alloc_size = sizeof(struct mvebu_gpio_priv),
123};