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gerrit.devboardsforandroid.linaro.org / platform / external / u-boot / d348a943e77ed72dd809cecf03365552545382b2 / . / drivers / gpio / vybrid_gpio.c
blob: 6eaf0a9ad4ca9c8fb290ec90173f75fb0e5bfd3d [file] [log] [blame]
Bhuvanchandra DVd348a942015-06-01 18:37:16 +0530[diff] [blame^]1/*
2 * Copyright (C) 2015
3 * Bhuvanchandra DV, Toradex, Inc.
4 *
5 * SPDX-License-Identifier: GPL-2.0+
6 */
7
8#include <common.h>
9#include <dm.h>
10#include <errno.h>
11#include <fdtdec.h>
12#include <asm/gpio.h>
13#include <asm/imx-common/iomux-v3.h>
14#include <asm/io.h>
15#include <malloc.h>
16
17DECLARE_GLOBAL_DATA_PTR;
18
19struct vybrid_gpios {
20 unsigned int chip;
21 struct vybrid_gpio_regs *reg;
22};
23
24static int vybrid_gpio_direction_input(struct udevice *dev, unsigned gpio)
25{
26 const struct vybrid_gpios *gpios = dev_get_priv(dev);
27
28 gpio = gpio + (gpios->chip * VYBRID_GPIO_COUNT);
29 imx_iomux_gpio_set_direction(gpio, VF610_GPIO_DIRECTION_IN);
30
31 return 0;
32}
33
34static int vybrid_gpio_direction_output(struct udevice *dev, unsigned gpio,
35 int value)
36{
37 const struct vybrid_gpios *gpios = dev_get_priv(dev);
38
39 gpio = gpio + (gpios->chip * VYBRID_GPIO_COUNT);
40 gpio_set_value(gpio, value);
41 imx_iomux_gpio_set_direction(gpio, VF610_GPIO_DIRECTION_OUT);
42
43 return 0;
44}
45
46static int vybrid_gpio_get_value(struct udevice *dev, unsigned gpio)
47{
48 const struct vybrid_gpios *gpios = dev_get_priv(dev);
49
50 return ((readl(&gpios->reg->gpio_pdir) & (1 << gpio))) ? 1 : 0;
51}
52
53static int vybrid_gpio_set_value(struct udevice *dev, unsigned gpio,
54 int value)
55{
56 const struct vybrid_gpios *gpios = dev_get_priv(dev);
57 if (value)
58 writel((1 << gpio), &gpios->reg->gpio_psor);
59 else
60 writel((1 << gpio), &gpios->reg->gpio_pcor);
61
62 return 0;
63}
64
65static int vybrid_gpio_get_function(struct udevice *dev, unsigned gpio)
66{
67 const struct vybrid_gpios *gpios = dev_get_priv(dev);
68 u32 g_state = 0;
69
70 gpio = gpio + (gpios->chip * VYBRID_GPIO_COUNT);
71
72 imx_iomux_gpio_get_function(gpio, &g_state);
73
74 if (((g_state & (0x07 << PAD_MUX_MODE_SHIFT)) >> PAD_MUX_MODE_SHIFT) > 0)
75 return GPIOF_FUNC;
76 if (g_state & PAD_CTL_OBE_ENABLE)
77 return GPIOF_OUTPUT;
78 if (g_state & PAD_CTL_IBE_ENABLE)
79 return GPIOF_INPUT;
80 if (!(g_state & PAD_CTL_OBE_IBE_ENABLE))
81 return GPIOF_UNUSED;
82
83 return GPIOF_UNKNOWN;
84}
85
86static const struct dm_gpio_ops gpio_vybrid_ops = {
87 .direction_input = vybrid_gpio_direction_input,
88 .direction_output = vybrid_gpio_direction_output,
89 .get_value = vybrid_gpio_get_value,
90 .set_value = vybrid_gpio_set_value,
91 .get_function = vybrid_gpio_get_function,
92};
93
94static int vybrid_gpio_probe(struct udevice *dev)
95{
96 struct vybrid_gpios *gpios = dev_get_priv(dev);
97 struct vybrid_gpio_platdata *plat = dev_get_platdata(dev);
98 struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
99
100 uc_priv->bank_name = plat->port_name;
101 uc_priv->gpio_count = VYBRID_GPIO_COUNT;
102 gpios->reg = (struct vybrid_gpio_regs *)plat->base;
103 gpios->chip = plat->chip;
104
105 return 0;
106}
107
108static int vybrid_gpio_bind(struct udevice *dev)
109{
110 struct vybrid_gpio_platdata *plat = dev->platdata;
111 fdt_addr_t base_addr;
112
113 if (plat)
114 return 0;
115
116 base_addr = dev_get_addr(dev);
117 if (base_addr == FDT_ADDR_T_NONE)
118 return -ENODEV;
119
120 /*
121 * TODO:
122 * When every board is converted to driver model and DT is
123 * supported, this can be done by auto-alloc feature, but
124 * not using calloc to alloc memory for platdata.
125 */
126 plat = calloc(1, sizeof(*plat));
127 if (!plat)
128 return -ENOMEM;
129
130 plat->base = base_addr;
131 plat->chip = dev->req_seq;
132 plat->port_name = fdt_get_name(gd->fdt_blob, dev->of_offset, NULL);
133 dev->platdata = plat;
134
135 return 0;
136}
137
138#ifndef CONFIG_OF_CONTROL
139static const struct vybrid_gpio_platdata vybrid_gpio[] = {
140 {0, GPIO0_BASE_ADDR, "GPIO0 "},
141 {1, GPIO1_BASE_ADDR, "GPIO1 "},
142 {2, GPIO2_BASE_ADDR, "GPIO2 "},
143 {3, GPIO3_BASE_ADDR, "GPIO3 "},
144 {4, GPIO4_BASE_ADDR, "GPIO4 "},
145};
146
147U_BOOT_DEVICES(vybrid_gpio) = {
148 { "gpio_vybrid", &vybrid_gpio[0] },
149 { "gpio_vybrid", &vybrid_gpio[1] },
150 { "gpio_vybrid", &vybrid_gpio[2] },
151 { "gpio_vybrid", &vybrid_gpio[3] },
152 { "gpio_vybrid", &vybrid_gpio[4] },
153};
154#endif
155
156static const struct udevice_id vybrid_gpio_ids[] = {
157 { .compatible = "fsl,vf610-gpio" },
158 { }
159};
160
161U_BOOT_DRIVER(gpio_vybrid) = {
162 .name = "gpio_vybrid",
163 .id = UCLASS_GPIO,
164 .ops = &gpio_vybrid_ops,
165 .probe = vybrid_gpio_probe,
166 .priv_auto_alloc_size = sizeof(struct vybrid_gpios),
167 .of_match = vybrid_gpio_ids,
168 .bind = vybrid_gpio_bind,
169};