Commit | Line | Data |
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ec43b08b HM |
1 | /* |
2 | * Sonics Silicon Backplane | |
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/ssb/ssb.h> | |
14 | ||
15 | #include "ssb_private.h" | |
16 | ||
17 | static struct ssb_bus *ssb_gpio_get_bus(struct gpio_chip *chip) | |
18 | { | |
19 | return container_of(chip, struct ssb_bus, gpio); | |
20 | } | |
21 | ||
22 | static int ssb_gpio_chipco_get_value(struct gpio_chip *chip, unsigned gpio) | |
23 | { | |
24 | struct ssb_bus *bus = ssb_gpio_get_bus(chip); | |
25 | ||
26 | return !!ssb_chipco_gpio_in(&bus->chipco, 1 << gpio); | |
27 | } | |
28 | ||
29 | static void ssb_gpio_chipco_set_value(struct gpio_chip *chip, unsigned gpio, | |
30 | int value) | |
31 | { | |
32 | struct ssb_bus *bus = ssb_gpio_get_bus(chip); | |
33 | ||
34 | ssb_chipco_gpio_out(&bus->chipco, 1 << gpio, value ? 1 << gpio : 0); | |
35 | } | |
36 | ||
37 | static int ssb_gpio_chipco_direction_input(struct gpio_chip *chip, | |
38 | unsigned gpio) | |
39 | { | |
40 | struct ssb_bus *bus = ssb_gpio_get_bus(chip); | |
41 | ||
42 | ssb_chipco_gpio_outen(&bus->chipco, 1 << gpio, 0); | |
43 | return 0; | |
44 | } | |
45 | ||
46 | static int ssb_gpio_chipco_direction_output(struct gpio_chip *chip, | |
47 | unsigned gpio, int value) | |
48 | { | |
49 | struct ssb_bus *bus = ssb_gpio_get_bus(chip); | |
50 | ||
51 | ssb_chipco_gpio_outen(&bus->chipco, 1 << gpio, 1 << gpio); | |
52 | ssb_chipco_gpio_out(&bus->chipco, 1 << gpio, value ? 1 << gpio : 0); | |
53 | return 0; | |
54 | } | |
55 | ||
56 | static int ssb_gpio_chipco_request(struct gpio_chip *chip, unsigned gpio) | |
57 | { | |
58 | struct ssb_bus *bus = ssb_gpio_get_bus(chip); | |
59 | ||
60 | ssb_chipco_gpio_control(&bus->chipco, 1 << gpio, 0); | |
61 | /* clear pulldown */ | |
62 | ssb_chipco_gpio_pulldown(&bus->chipco, 1 << gpio, 0); | |
63 | /* Set pullup */ | |
64 | ssb_chipco_gpio_pullup(&bus->chipco, 1 << gpio, 1 << gpio); | |
65 | ||
66 | return 0; | |
67 | } | |
68 | ||
69 | static void ssb_gpio_chipco_free(struct gpio_chip *chip, unsigned gpio) | |
70 | { | |
71 | struct ssb_bus *bus = ssb_gpio_get_bus(chip); | |
72 | ||
73 | /* clear pullup */ | |
74 | ssb_chipco_gpio_pullup(&bus->chipco, 1 << gpio, 0); | |
75 | } | |
76 | ||
77 | static int ssb_gpio_chipco_init(struct ssb_bus *bus) | |
78 | { | |
79 | struct gpio_chip *chip = &bus->gpio; | |
80 | ||
81 | chip->label = "ssb_chipco_gpio"; | |
82 | chip->owner = THIS_MODULE; | |
83 | chip->request = ssb_gpio_chipco_request; | |
84 | chip->free = ssb_gpio_chipco_free; | |
85 | chip->get = ssb_gpio_chipco_get_value; | |
86 | chip->set = ssb_gpio_chipco_set_value; | |
87 | chip->direction_input = ssb_gpio_chipco_direction_input; | |
88 | chip->direction_output = ssb_gpio_chipco_direction_output; | |
89 | chip->ngpio = 16; | |
90 | /* There is just one SoC in one device and its GPIO addresses should be | |
91 | * deterministic to address them more easily. The other buses could get | |
92 | * a random base number. */ | |
93 | if (bus->bustype == SSB_BUSTYPE_SSB) | |
94 | chip->base = 0; | |
95 | else | |
96 | chip->base = -1; | |
97 | ||
98 | return gpiochip_add(chip); | |
99 | } | |
100 | ||
101 | #ifdef CONFIG_SSB_DRIVER_EXTIF | |
102 | ||
103 | static int ssb_gpio_extif_get_value(struct gpio_chip *chip, unsigned gpio) | |
104 | { | |
105 | struct ssb_bus *bus = ssb_gpio_get_bus(chip); | |
106 | ||
107 | return !!ssb_extif_gpio_in(&bus->extif, 1 << gpio); | |
108 | } | |
109 | ||
110 | static void ssb_gpio_extif_set_value(struct gpio_chip *chip, unsigned gpio, | |
111 | int value) | |
112 | { | |
113 | struct ssb_bus *bus = ssb_gpio_get_bus(chip); | |
114 | ||
115 | ssb_extif_gpio_out(&bus->extif, 1 << gpio, value ? 1 << gpio : 0); | |
116 | } | |
117 | ||
118 | static int ssb_gpio_extif_direction_input(struct gpio_chip *chip, | |
119 | unsigned gpio) | |
120 | { | |
121 | struct ssb_bus *bus = ssb_gpio_get_bus(chip); | |
122 | ||
123 | ssb_extif_gpio_outen(&bus->extif, 1 << gpio, 0); | |
124 | return 0; | |
125 | } | |
126 | ||
127 | static int ssb_gpio_extif_direction_output(struct gpio_chip *chip, | |
128 | unsigned gpio, int value) | |
129 | { | |
130 | struct ssb_bus *bus = ssb_gpio_get_bus(chip); | |
131 | ||
132 | ssb_extif_gpio_outen(&bus->extif, 1 << gpio, 1 << gpio); | |
133 | ssb_extif_gpio_out(&bus->extif, 1 << gpio, value ? 1 << gpio : 0); | |
134 | return 0; | |
135 | } | |
136 | ||
137 | static int ssb_gpio_extif_init(struct ssb_bus *bus) | |
138 | { | |
139 | struct gpio_chip *chip = &bus->gpio; | |
140 | ||
141 | chip->label = "ssb_extif_gpio"; | |
142 | chip->owner = THIS_MODULE; | |
143 | chip->get = ssb_gpio_extif_get_value; | |
144 | chip->set = ssb_gpio_extif_set_value; | |
145 | chip->direction_input = ssb_gpio_extif_direction_input; | |
146 | chip->direction_output = ssb_gpio_extif_direction_output; | |
147 | chip->ngpio = 5; | |
148 | /* There is just one SoC in one device and its GPIO addresses should be | |
149 | * deterministic to address them more easily. The other buses could get | |
150 | * a random base number. */ | |
151 | if (bus->bustype == SSB_BUSTYPE_SSB) | |
152 | chip->base = 0; | |
153 | else | |
154 | chip->base = -1; | |
155 | ||
156 | return gpiochip_add(chip); | |
157 | } | |
158 | ||
159 | #else | |
160 | static int ssb_gpio_extif_init(struct ssb_bus *bus) | |
161 | { | |
162 | return -ENOTSUPP; | |
163 | } | |
164 | #endif | |
165 | ||
166 | int ssb_gpio_init(struct ssb_bus *bus) | |
167 | { | |
168 | if (ssb_chipco_available(&bus->chipco)) | |
169 | return ssb_gpio_chipco_init(bus); | |
170 | else if (ssb_extif_available(&bus->extif)) | |
171 | return ssb_gpio_extif_init(bus); | |
172 | else | |
173 | SSB_WARN_ON(1); | |
174 | ||
175 | return -1; | |
176 | } |