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gerrit-public.fairphone.software / kernel / msm-4.9 / 621dd2474399237ca556a54037c3b8557e80d021 / . / arch / blackfin / mach-bf538 / ext-gpio.c
blob: 180b1252679ff7e227a9490fad7c5a6d91a4c5d5 [file] [log] [blame]
Michael Hennerich621dd242009-09-28 12:23:41 +0000[diff] [blame^]1/*
2 * GPIOLIB interface for BF538/9 PORT C, D, and E GPIOs
3 *
4 * Copyright 2009 Analog Devices Inc.
5 *
6 * Licensed under the GPL-2 or later.
7 */
8
9#include <linux/module.h>
10#include <linux/err.h>
11#include <asm/blackfin.h>
12#include <asm/gpio.h>
13#include <asm/portmux.h>
14
15#define DEFINE_REG(reg, off) \
16static inline u16 read_##reg(void __iomem *port) \
17 { return bfin_read16(port + off); } \
18static inline void write_##reg(void __iomem *port, u16 v) \
19 { bfin_write16(port + off, v); }
20
21DEFINE_REG(PORTIO, 0x00)
22DEFINE_REG(PORTIO_CLEAR, 0x10)
23DEFINE_REG(PORTIO_SET, 0x20)
24DEFINE_REG(PORTIO_DIR, 0x40)
25DEFINE_REG(PORTIO_INEN, 0x50)
26
27static void __iomem *gpio_chip_to_mmr(struct gpio_chip *chip)
28{
29 switch (chip->base) {
30 default: /* not really needed, but keeps gcc happy */
31 case GPIO_PC0: return (void __iomem *)PORTCIO;
32 case GPIO_PD0: return (void __iomem *)PORTDIO;
33 case GPIO_PE0: return (void __iomem *)PORTEIO;
34 }
35}
36
37static int bf538_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
38{
39 void __iomem *port = gpio_chip_to_mmr(chip);
40 return !!(read_PORTIO(port) & (1u << gpio));
41}
42
43static void bf538_gpio_set_value(struct gpio_chip *chip, unsigned gpio, int value)
44{
45 void __iomem *port = gpio_chip_to_mmr(chip);
46 if (value)
47 write_PORTIO_SET(port, (1u << gpio));
48 else
49 write_PORTIO_CLEAR(port, (1u << gpio));
50}
51
52static int bf538_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
53{
54 void __iomem *port = gpio_chip_to_mmr(chip);
55 write_PORTIO_DIR(port, read_PORTIO_DIR(port) & ~(1u << gpio));
56 write_PORTIO_INEN(port, read_PORTIO_INEN(port) | (1u << gpio));
57 return 0;
58}
59
60static int bf538_gpio_direction_output(struct gpio_chip *chip, unsigned gpio, int value)
61{
62 void __iomem *port = gpio_chip_to_mmr(chip);
63 write_PORTIO_INEN(port, read_PORTIO_INEN(port) & ~(1u << gpio));
64 bf538_gpio_set_value(port, gpio, value);
65 write_PORTIO_DIR(port, read_PORTIO_DIR(port) | (1u << gpio));
66 return 0;
67}
68
69static int bf538_gpio_request(struct gpio_chip *chip, unsigned gpio)
70{
71 return bfin_special_gpio_request(chip->base + gpio, chip->label);
72}
73
74static void bf538_gpio_free(struct gpio_chip *chip, unsigned gpio)
75{
76 return bfin_special_gpio_free(chip->base + gpio);
77}
78
79/* We don't set the irq fields as these banks cannot generate interrupts */
80
81static struct gpio_chip bf538_portc_chip = {
82 .label = "GPIO-PC",
83 .direction_input = bf538_gpio_direction_input,
84 .get = bf538_gpio_get_value,
85 .direction_output = bf538_gpio_direction_output,
86 .set = bf538_gpio_set_value,
87 .request = bf538_gpio_request,
88 .free = bf538_gpio_free,
89 .base = GPIO_PC0,
90 .ngpio = GPIO_PC9 - GPIO_PC0 + 1,
91};
92
93static struct gpio_chip bf538_portd_chip = {
94 .label = "GPIO-PD",
95 .direction_input = bf538_gpio_direction_input,
96 .get = bf538_gpio_get_value,
97 .direction_output = bf538_gpio_direction_output,
98 .set = bf538_gpio_set_value,
99 .request = bf538_gpio_request,
100 .free = bf538_gpio_free,
101 .base = GPIO_PD0,
102 .ngpio = GPIO_PD13 - GPIO_PD0 + 1,
103};
104
105static struct gpio_chip bf538_porte_chip = {
106 .label = "GPIO-PE",
107 .direction_input = bf538_gpio_direction_input,
108 .get = bf538_gpio_get_value,
109 .direction_output = bf538_gpio_direction_output,
110 .set = bf538_gpio_set_value,
111 .request = bf538_gpio_request,
112 .free = bf538_gpio_free,
113 .base = GPIO_PE0,
114 .ngpio = GPIO_PE15 - GPIO_PE0 + 1,
115};
116
117static int __init bf538_extgpio_setup(void)
118{
119 return gpiochip_add(&bf538_portc_chip) |
120 gpiochip_add(&bf538_portd_chip) |
121 gpiochip_add(&bf538_porte_chip);
122}
123arch_initcall(bf538_extgpio_setup);