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gerrit.devboardsforandroid.linaro.org / platform / external / u-boot / 724368928c889bf754bea176f3e0aea5c1ec01b9 / . / drivers / gpio / stm32f7_gpio.c
blob: 653e9bef4b3ae0270aae5947ace98f03b3d7c99b [file] [log] [blame]
Vikas Manocha77417102017-04-10 15:02:57 -0700[diff] [blame]1/*
2 * (C) Copyright 2017
3 * Vikas Manocha, <vikas.manocha@st.com>
4 *
5 * SPDX-License-Identifier: GPL-2.0+
6 */
7
8#include <common.h>
9#include <clk.h>
10#include <dm.h>
11#include <fdtdec.h>
12#include <asm/arch/gpio.h>
13#include <asm/arch/stm32.h>
14#include <asm/gpio.h>
15#include <asm/io.h>
16#include <linux/errno.h>
17#include <linux/io.h>
18
19#define MAX_SIZE_BANK_NAME 5
20#define STM32_GPIOS_PER_BANK 16
21#define MODE_BITS(gpio_pin) (gpio_pin * 2)
22#define MODE_BITS_MASK 3
23#define IN_OUT_BIT_INDEX(gpio_pin) (1UL << (gpio_pin))
24
25DECLARE_GLOBAL_DATA_PTR;
26
27static int stm32_gpio_direction_input(struct udevice *dev, unsigned offset)
28{
29 struct stm32_gpio_priv *priv = dev_get_priv(dev);
30 struct stm32_gpio_regs *regs = priv->regs;
31 int bits_index = MODE_BITS(offset);
32 int mask = MODE_BITS_MASK << bits_index;
33
34 clrsetbits_le32(&regs->moder, mask, STM32_GPIO_MODE_IN << bits_index);
35
36 return 0;
37}
38
39static int stm32_gpio_direction_output(struct udevice *dev, unsigned offset,
40 int value)
41{
42 struct stm32_gpio_priv *priv = dev_get_priv(dev);
43 struct stm32_gpio_regs *regs = priv->regs;
44 int bits_index = MODE_BITS(offset);
45 int mask = MODE_BITS_MASK << bits_index;
46
47 clrsetbits_le32(&regs->moder, mask, STM32_GPIO_MODE_OUT << bits_index);
48 mask = IN_OUT_BIT_INDEX(offset);
49 clrsetbits_le32(&regs->odr, mask, value ? mask : 0);
50
51 return 0;
52}
53
54static int stm32_gpio_get_value(struct udevice *dev, unsigned offset)
55{
56 struct stm32_gpio_priv *priv = dev_get_priv(dev);
57 struct stm32_gpio_regs *regs = priv->regs;
58
59 return readl(&regs->idr) & IN_OUT_BIT_INDEX(offset) ? 1 : 0;
60}
61
62static int stm32_gpio_set_value(struct udevice *dev, unsigned offset, int value)
63{
64 struct stm32_gpio_priv *priv = dev_get_priv(dev);
65 struct stm32_gpio_regs *regs = priv->regs;
66 int mask = IN_OUT_BIT_INDEX(offset);
67
68 clrsetbits_le32(&regs->odr, mask, value ? mask : 0);
69
70 return 0;
71}
72
73static const struct dm_gpio_ops gpio_stm32_ops = {
74 .direction_input = stm32_gpio_direction_input,
75 .direction_output = stm32_gpio_direction_output,
76 .get_value = stm32_gpio_get_value,
77 .set_value = stm32_gpio_set_value,
78};
79
80static int gpio_stm32_probe(struct udevice *dev)
81{
82 struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
83 struct stm32_gpio_priv *priv = dev_get_priv(dev);
84 fdt_addr_t addr;
85 char *name;
86
Simon Glassa821c4a2017-05-17 17:18:05 -0600[diff] [blame]87 addr = devfdt_get_addr(dev);
Vikas Manocha77417102017-04-10 15:02:57 -0700[diff] [blame]88 if (addr == FDT_ADDR_T_NONE)
89 return -EINVAL;
90
91 priv->regs = (struct stm32_gpio_regs *)addr;
92 name = (char *)fdtdec_locate_byte_array(gd->fdt_blob,
93 dev_of_offset(dev),
94 "st,bank-name",
95 MAX_SIZE_BANK_NAME);
96 if (!name)
97 return -EINVAL;
98 uc_priv->bank_name = name;
99 uc_priv->gpio_count = STM32_GPIOS_PER_BANK;
100 debug("%s, addr = 0x%p, bank_name = %s\n", __func__, (u32 *)priv->regs,
101 uc_priv->bank_name);
102
103#ifdef CONFIG_CLK
104 struct clk clk;
105 int ret;
106 ret = clk_get_by_index(dev, 0, &clk);
107 if (ret < 0)
108 return ret;
109
110 ret = clk_enable(&clk);
111
112 if (ret) {
113 dev_err(dev, "failed to enable clock\n");
114 return ret;
115 }
116 debug("clock enabled for device %s\n", dev->name);
117#endif
118
119 return 0;
120}
121
122static const struct udevice_id stm32_gpio_ids[] = {
123 { .compatible = "st,stm32-gpio" },
124 { }
125};
126
127U_BOOT_DRIVER(gpio_stm32) = {
128 .name = "gpio_stm32",
129 .id = UCLASS_GPIO,
130 .of_match = stm32_gpio_ids,
131 .probe = gpio_stm32_probe,
132 .ops = &gpio_stm32_ops,
133 .flags = DM_FLAG_PRE_RELOC | DM_UC_FLAG_SEQ_ALIAS,
134 .priv_auto_alloc_size = sizeof(struct stm32_gpio_priv),
135};