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af39bb8b | 1 | /* |
2 | * Coldfire generic GPIO support. | |
3 | * | |
4 | * (C) Copyright 2009, Steven King <sfking@fdwdc.com> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; version 2 of the License. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | */ | |
15 | ||
16 | #include <linux/kernel.h> | |
17 | #include <linux/init.h> | |
18 | #include <linux/sysdev.h> | |
19 | ||
20 | #include <asm/gpio.h> | |
21 | #include <asm/pinmux.h> | |
22 | #include <asm/mcfgpio.h> | |
23 | ||
24 | #define MCF_CHIP(chip) container_of(chip, struct mcf_gpio_chip, gpio_chip) | |
25 | ||
26 | int mcf_gpio_direction_input(struct gpio_chip *chip, unsigned offset) | |
27 | { | |
28 | unsigned long flags; | |
29 | MCFGPIO_PORTTYPE dir; | |
30 | struct mcf_gpio_chip *mcf_chip = MCF_CHIP(chip); | |
31 | ||
32 | local_irq_save(flags); | |
33 | dir = mcfgpio_read(mcf_chip->pddr); | |
34 | dir &= ~mcfgpio_bit(chip->base + offset); | |
35 | mcfgpio_write(dir, mcf_chip->pddr); | |
36 | local_irq_restore(flags); | |
37 | ||
38 | return 0; | |
39 | } | |
40 | ||
41 | int mcf_gpio_get_value(struct gpio_chip *chip, unsigned offset) | |
42 | { | |
43 | struct mcf_gpio_chip *mcf_chip = MCF_CHIP(chip); | |
44 | ||
45 | return mcfgpio_read(mcf_chip->ppdr) & mcfgpio_bit(chip->base + offset); | |
46 | } | |
47 | ||
48 | int mcf_gpio_direction_output(struct gpio_chip *chip, unsigned offset, | |
49 | int value) | |
50 | { | |
51 | unsigned long flags; | |
52 | MCFGPIO_PORTTYPE data; | |
53 | struct mcf_gpio_chip *mcf_chip = MCF_CHIP(chip); | |
54 | ||
55 | local_irq_save(flags); | |
56 | /* write the value to the output latch */ | |
57 | data = mcfgpio_read(mcf_chip->podr); | |
58 | if (value) | |
59 | data |= mcfgpio_bit(chip->base + offset); | |
60 | else | |
61 | data &= ~mcfgpio_bit(chip->base + offset); | |
62 | mcfgpio_write(data, mcf_chip->podr); | |
63 | ||
64 | /* now set the direction to output */ | |
65 | data = mcfgpio_read(mcf_chip->pddr); | |
66 | data |= mcfgpio_bit(chip->base + offset); | |
67 | mcfgpio_write(data, mcf_chip->pddr); | |
68 | local_irq_restore(flags); | |
69 | ||
70 | return 0; | |
71 | } | |
72 | ||
73 | void mcf_gpio_set_value(struct gpio_chip *chip, unsigned offset, int value) | |
74 | { | |
75 | struct mcf_gpio_chip *mcf_chip = MCF_CHIP(chip); | |
76 | ||
77 | unsigned long flags; | |
78 | MCFGPIO_PORTTYPE data; | |
79 | ||
80 | local_irq_save(flags); | |
81 | data = mcfgpio_read(mcf_chip->podr); | |
82 | if (value) | |
83 | data |= mcfgpio_bit(chip->base + offset); | |
84 | else | |
85 | data &= ~mcfgpio_bit(chip->base + offset); | |
86 | mcfgpio_write(data, mcf_chip->podr); | |
87 | local_irq_restore(flags); | |
88 | } | |
89 | ||
90 | void mcf_gpio_set_value_fast(struct gpio_chip *chip, unsigned offset, int value) | |
91 | { | |
92 | struct mcf_gpio_chip *mcf_chip = MCF_CHIP(chip); | |
93 | ||
94 | if (value) | |
95 | mcfgpio_write(mcfgpio_bit(chip->base + offset), mcf_chip->setr); | |
96 | else | |
97 | mcfgpio_write(~mcfgpio_bit(chip->base + offset), mcf_chip->clrr); | |
98 | } | |
99 | ||
100 | int mcf_gpio_request(struct gpio_chip *chip, unsigned offset) | |
101 | { | |
102 | struct mcf_gpio_chip *mcf_chip = MCF_CHIP(chip); | |
103 | ||
104 | return mcf_chip->gpio_to_pinmux ? | |
105 | mcf_pinmux_request(mcf_chip->gpio_to_pinmux[offset], 0) : 0; | |
106 | } | |
107 | ||
108 | void mcf_gpio_free(struct gpio_chip *chip, unsigned offset) | |
109 | { | |
110 | struct mcf_gpio_chip *mcf_chip = MCF_CHIP(chip); | |
111 | ||
112 | mcf_gpio_direction_input(chip, offset); | |
113 | ||
114 | if (mcf_chip->gpio_to_pinmux) | |
115 | mcf_pinmux_release(mcf_chip->gpio_to_pinmux[offset], 0); | |
116 | } | |
117 | ||
118 | struct sysdev_class mcf_gpio_sysclass = { | |
119 | .name = "gpio", | |
120 | }; | |
121 | ||
122 | static int __init mcf_gpio_sysinit(void) | |
123 | { | |
124 | return sysdev_class_register(&mcf_gpio_sysclass); | |
125 | } | |
126 | ||
127 | core_initcall(mcf_gpio_sysinit); |