summaryrefslogtreecommitdiff
path: root/drivers/gpio/pic32_gpio.c
blob: d8789e76078b9bfa8d4b750d75c46e8362fa9741 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (c) 2015 Microchip Technology Inc
 * Purna Chandra Mandal <purna.mandal@microchip.com>
 */

#include <common.h>
#include <dm.h>
#include <errno.h>
#include <malloc.h>
#include <asm/io.h>
#include <asm/gpio.h>
#include <linux/compat.h>
#include <mach/pic32.h>

DECLARE_GLOBAL_DATA_PTR;

/* Peripheral Pin Control */
struct pic32_reg_port {
	struct pic32_reg_atomic ansel;
	struct pic32_reg_atomic tris;
	struct pic32_reg_atomic port;
	struct pic32_reg_atomic lat;
	struct pic32_reg_atomic open_drain;
	struct pic32_reg_atomic cnpu;
	struct pic32_reg_atomic cnpd;
	struct pic32_reg_atomic cncon;
};

enum {
	MICROCHIP_GPIO_DIR_OUT,
	MICROCHIP_GPIO_DIR_IN,
	MICROCHIP_GPIOS_PER_BANK = 16,
};

struct pic32_gpio_priv {
	struct pic32_reg_port *regs;
	char name[2];
};

static int pic32_gpio_get_value(struct udevice *dev, unsigned offset)
{
	struct pic32_gpio_priv *priv = dev_get_priv(dev);

	return !!(readl(&priv->regs->port.raw) & BIT(offset));
}

static int pic32_gpio_set_value(struct udevice *dev, unsigned offset,
				int value)
{
	struct pic32_gpio_priv *priv = dev_get_priv(dev);
	int mask = BIT(offset);

	if (value)
		writel(mask, &priv->regs->port.set);
	else
		writel(mask, &priv->regs->port.clr);

	return 0;
}

static int pic32_gpio_direction(struct udevice *dev, unsigned offset)
{
	struct pic32_gpio_priv *priv = dev_get_priv(dev);

	/* pin in analog mode ? */
	if (readl(&priv->regs->ansel.raw) & BIT(offset))
		return -EPERM;

	if (readl(&priv->regs->tris.raw) & BIT(offset))
		return MICROCHIP_GPIO_DIR_IN;
	else
		return MICROCHIP_GPIO_DIR_OUT;
}

static int pic32_gpio_direction_input(struct udevice *dev, unsigned offset)
{
	struct pic32_gpio_priv *priv = dev_get_priv(dev);
	int mask = BIT(offset);

	writel(mask, &priv->regs->ansel.clr);
	writel(mask, &priv->regs->tris.set);

	return 0;
}

static int pic32_gpio_direction_output(struct udevice *dev,
				       unsigned offset, int value)
{
	struct pic32_gpio_priv *priv = dev_get_priv(dev);
	int mask = BIT(offset);

	writel(mask, &priv->regs->ansel.clr);
	writel(mask, &priv->regs->tris.clr);

	pic32_gpio_set_value(dev, offset, value);
	return 0;
}

static int pic32_gpio_get_function(struct udevice *dev, unsigned offset)
{
	int ret = GPIOF_UNUSED;

	switch (pic32_gpio_direction(dev, offset)) {
	case MICROCHIP_GPIO_DIR_OUT:
		ret = GPIOF_OUTPUT;
		break;
	case MICROCHIP_GPIO_DIR_IN:
		ret = GPIOF_INPUT;
		break;
	default:
		ret = GPIOF_UNUSED;
		break;
	}
	return ret;
}

static const struct dm_gpio_ops gpio_pic32_ops = {
	.direction_input	= pic32_gpio_direction_input,
	.direction_output	= pic32_gpio_direction_output,
	.get_value		= pic32_gpio_get_value,
	.set_value		= pic32_gpio_set_value,
	.get_function		= pic32_gpio_get_function,
};

static int pic32_gpio_probe(struct udevice *dev)
{
	struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
	struct pic32_gpio_priv *priv = dev_get_priv(dev);
	fdt_addr_t addr;
	fdt_size_t size;
	char *end;
	int bank;

	addr = fdtdec_get_addr_size(gd->fdt_blob, dev_of_offset(dev), "reg",
				    &size);
	if (addr == FDT_ADDR_T_NONE)
		return -EINVAL;

	priv->regs = ioremap(addr, size);

	uc_priv->gpio_count = MICROCHIP_GPIOS_PER_BANK;
	/* extract bank name */
	end = strrchr(dev->name, '@');
	bank = trailing_strtoln(dev->name, end);
	priv->name[0] = 'A' + bank;
	uc_priv->bank_name = priv->name;

	return 0;
}

static const struct udevice_id pic32_gpio_ids[] = {
	{ .compatible = "microchip,pic32mzda-gpio" },
	{ }
};

U_BOOT_DRIVER(gpio_pic32) = {
	.name		= "gpio_pic32",
	.id		= UCLASS_GPIO,
	.of_match	= pic32_gpio_ids,
	.ops		= &gpio_pic32_ops,
	.probe		= pic32_gpio_probe,
	.priv_auto_alloc_size	= sizeof(struct pic32_gpio_priv),
};