Commit | Line | Data |
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cf0936b0 HM |
1 | /* |
2 | * Broadcom specific AMBA | |
3 | * GPIO driver | |
4 | * | |
5 | * Copyright 2011, Broadcom Corporation | |
6 | * Copyright 2012, Hauke Mehrtens <hauke@hauke-m.de> | |
7 | * | |
8 | * Licensed under the GNU/GPL. See COPYING for details. | |
9 | */ | |
10 | ||
11 | #include <linux/gpio.h> | |
12 | #include <linux/export.h> | |
13 | #include <linux/bcma/bcma.h> | |
14 | ||
15 | #include "bcma_private.h" | |
16 | ||
17 | static inline struct bcma_drv_cc *bcma_gpio_get_cc(struct gpio_chip *chip) | |
18 | { | |
19 | return container_of(chip, struct bcma_drv_cc, gpio); | |
20 | } | |
21 | ||
22 | static int bcma_gpio_get_value(struct gpio_chip *chip, unsigned gpio) | |
23 | { | |
24 | struct bcma_drv_cc *cc = bcma_gpio_get_cc(chip); | |
25 | ||
26 | return !!bcma_chipco_gpio_in(cc, 1 << gpio); | |
27 | } | |
28 | ||
29 | static void bcma_gpio_set_value(struct gpio_chip *chip, unsigned gpio, | |
30 | int value) | |
31 | { | |
32 | struct bcma_drv_cc *cc = bcma_gpio_get_cc(chip); | |
33 | ||
34 | bcma_chipco_gpio_out(cc, 1 << gpio, value ? 1 << gpio : 0); | |
35 | } | |
36 | ||
37 | static int bcma_gpio_direction_input(struct gpio_chip *chip, unsigned gpio) | |
38 | { | |
39 | struct bcma_drv_cc *cc = bcma_gpio_get_cc(chip); | |
40 | ||
41 | bcma_chipco_gpio_outen(cc, 1 << gpio, 0); | |
42 | return 0; | |
43 | } | |
44 | ||
45 | static int bcma_gpio_direction_output(struct gpio_chip *chip, unsigned gpio, | |
46 | int value) | |
47 | { | |
48 | struct bcma_drv_cc *cc = bcma_gpio_get_cc(chip); | |
49 | ||
50 | bcma_chipco_gpio_outen(cc, 1 << gpio, 1 << gpio); | |
51 | bcma_chipco_gpio_out(cc, 1 << gpio, value ? 1 << gpio : 0); | |
52 | return 0; | |
53 | } | |
54 | ||
55 | static int bcma_gpio_request(struct gpio_chip *chip, unsigned gpio) | |
56 | { | |
57 | struct bcma_drv_cc *cc = bcma_gpio_get_cc(chip); | |
58 | ||
59 | bcma_chipco_gpio_control(cc, 1 << gpio, 0); | |
60 | /* clear pulldown */ | |
61 | bcma_chipco_gpio_pulldown(cc, 1 << gpio, 0); | |
62 | /* Set pullup */ | |
63 | bcma_chipco_gpio_pullup(cc, 1 << gpio, 1 << gpio); | |
64 | ||
65 | return 0; | |
66 | } | |
67 | ||
68 | static void bcma_gpio_free(struct gpio_chip *chip, unsigned gpio) | |
69 | { | |
70 | struct bcma_drv_cc *cc = bcma_gpio_get_cc(chip); | |
71 | ||
72 | /* clear pullup */ | |
73 | bcma_chipco_gpio_pullup(cc, 1 << gpio, 0); | |
74 | } | |
75 | ||
8f1ca268 HM |
76 | static int bcma_gpio_to_irq(struct gpio_chip *chip, unsigned gpio) |
77 | { | |
78 | struct bcma_drv_cc *cc = bcma_gpio_get_cc(chip); | |
79 | ||
80 | if (cc->core->bus->hosttype == BCMA_HOSTTYPE_SOC) | |
81 | return bcma_core_irq(cc->core); | |
82 | else | |
83 | return -EINVAL; | |
84 | } | |
85 | ||
cf0936b0 HM |
86 | int bcma_gpio_init(struct bcma_drv_cc *cc) |
87 | { | |
88 | struct gpio_chip *chip = &cc->gpio; | |
89 | ||
90 | chip->label = "bcma_gpio"; | |
91 | chip->owner = THIS_MODULE; | |
92 | chip->request = bcma_gpio_request; | |
93 | chip->free = bcma_gpio_free; | |
94 | chip->get = bcma_gpio_get_value; | |
95 | chip->set = bcma_gpio_set_value; | |
96 | chip->direction_input = bcma_gpio_direction_input; | |
97 | chip->direction_output = bcma_gpio_direction_output; | |
8f1ca268 | 98 | chip->to_irq = bcma_gpio_to_irq; |
cf0936b0 HM |
99 | chip->ngpio = 16; |
100 | /* There is just one SoC in one device and its GPIO addresses should be | |
101 | * deterministic to address them more easily. The other buses could get | |
102 | * a random base number. */ | |
103 | if (cc->core->bus->hosttype == BCMA_HOSTTYPE_SOC) | |
104 | chip->base = 0; | |
105 | else | |
106 | chip->base = -1; | |
107 | ||
108 | return gpiochip_add(chip); | |
109 | } | |
c50ae947 HM |
110 | |
111 | int bcma_gpio_unregister(struct bcma_drv_cc *cc) | |
112 | { | |
113 | return gpiochip_remove(&cc->gpio); | |
114 | } |