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3d9edf09 VB |
1 | /* |
2 | * TI DaVinci GPIO Support | |
3 | * | |
4 | * Copyright (c) 2006 David Brownell | |
5 | * Copyright (c) 2007, MontaVista Software, Inc. <source@mvista.com> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | */ | |
12 | ||
13 | #ifndef __DAVINCI_GPIO_H | |
14 | #define __DAVINCI_GPIO_H | |
15 | ||
558de8a7 | 16 | #include <linux/io.h> |
dce1115b | 17 | #include <asm-generic/gpio.h> |
f5c122da | 18 | |
80b02c17 | 19 | #include <mach/irqs.h> |
a994955c | 20 | #include <mach/common.h> |
558de8a7 | 21 | |
f5c122da KH |
22 | #define DAVINCI_GPIO_BASE 0x01C67000 |
23 | ||
686b634a CC |
24 | enum davinci_gpio_type { |
25 | GPIO_TYPE_DAVINCI = 0, | |
26 | }; | |
27 | ||
3d9edf09 VB |
28 | /* |
29 | * basic gpio routines | |
30 | * | |
31 | * board-specific init should be done by arch/.../.../board-XXX.c (maybe | |
32 | * initializing banks together) rather than boot loaders; kexec() won't | |
33 | * go through boot loaders. | |
34 | * | |
35 | * the gpio clock will be turned on when gpios are used, and you may also | |
474dad54 | 36 | * need to pay attention to PINMUX registers to be sure those pins are |
3d9edf09 VB |
37 | * used as gpios, not with other peripherals. |
38 | * | |
dce1115b | 39 | * On-chip GPIOs are numbered 0..(DAVINCI_N_GPIO-1). For documentation, |
474dad54 DB |
40 | * and maybe for later updates, code may write GPIO(N). These may be |
41 | * all 1.8V signals, all 3.3V ones, or a mix of the two. A given chip | |
42 | * may not support all the GPIOs in that range. | |
dce1115b DB |
43 | * |
44 | * GPIOs can also be on external chips, numbered after the ones built-in | |
45 | * to the DaVinci chip. For now, they won't be usable as IRQ sources. | |
3d9edf09 | 46 | */ |
474dad54 | 47 | #define GPIO(X) (X) /* 0 <= X <= (DAVINCI_N_GPIO - 1) */ |
3d9edf09 | 48 | |
b1466376 SR |
49 | /* Convert GPIO signal to GPIO pin number */ |
50 | #define GPIO_TO_PIN(bank, gpio) (16 * (bank) + (gpio)) | |
51 | ||
99e9e52d | 52 | struct davinci_gpio_controller { |
99e9e52d CC |
53 | struct gpio_chip chip; |
54 | int irq_base; | |
c12f415a CC |
55 | void __iomem *regs; |
56 | void __iomem *set_data; | |
57 | void __iomem *clr_data; | |
58 | void __iomem *in_data; | |
99e9e52d CC |
59 | }; |
60 | ||
3d9edf09 VB |
61 | /* The __gpio_to_controller() and __gpio_mask() functions inline to constants |
62 | * with constant parameters; or in outlined code they execute at runtime. | |
63 | * | |
64 | * You'd access the controller directly when reading or writing more than | |
65 | * one gpio value at a time, and to support wired logic where the value | |
66 | * being driven by the cpu need not match the value read back. | |
67 | * | |
68 | * These are NOT part of the cross-platform GPIO interface | |
69 | */ | |
c12f415a | 70 | static inline struct davinci_gpio_controller * |
3d9edf09 VB |
71 | __gpio_to_controller(unsigned gpio) |
72 | { | |
c12f415a CC |
73 | struct davinci_gpio_controller *ctlrs = davinci_soc_info.gpio_ctlrs; |
74 | int index = gpio / 32; | |
75 | ||
76 | if (!ctlrs || index >= davinci_soc_info.gpio_ctlrs_num) | |
77 | return NULL; | |
78 | ||
79 | return ctlrs + index; | |
3d9edf09 VB |
80 | } |
81 | ||
82 | static inline u32 __gpio_mask(unsigned gpio) | |
83 | { | |
84 | return 1 << (gpio % 32); | |
85 | } | |
86 | ||
87 | /* The get/set/clear functions will inline when called with constant | |
dce1115b | 88 | * parameters referencing built-in GPIOs, for low-overhead bitbanging. |
3d9edf09 | 89 | * |
dce1115b DB |
90 | * Otherwise, calls with variable parameters or referencing external |
91 | * GPIOs (e.g. on GPIO expander chips) use outlined functions. | |
3d9edf09 | 92 | */ |
3d9edf09 VB |
93 | static inline void gpio_set_value(unsigned gpio, int value) |
94 | { | |
c12f415a CC |
95 | if (__builtin_constant_p(value) && gpio < davinci_soc_info.gpio_num) { |
96 | struct davinci_gpio_controller *ctlr; | |
97 | u32 mask; | |
3d9edf09 | 98 | |
c12f415a | 99 | ctlr = __gpio_to_controller(gpio); |
3d9edf09 VB |
100 | mask = __gpio_mask(gpio); |
101 | if (value) | |
c12f415a | 102 | __raw_writel(mask, ctlr->set_data); |
3d9edf09 | 103 | else |
c12f415a | 104 | __raw_writel(mask, ctlr->clr_data); |
3d9edf09 VB |
105 | return; |
106 | } | |
107 | ||
dce1115b | 108 | __gpio_set_value(gpio, value); |
3d9edf09 VB |
109 | } |
110 | ||
111 | /* Returns zero or nonzero; works for gpios configured as inputs OR | |
dce1115b | 112 | * as outputs, at least for built-in GPIOs. |
3d9edf09 | 113 | * |
dce1115b DB |
114 | * NOTE: for built-in GPIOs, changes in reported values are synchronized |
115 | * to the GPIO clock. This is easily seen after calling gpio_set_value() | |
116 | * and then immediately gpio_get_value(), where the gpio_get_value() will | |
117 | * return the old value until the GPIO clock ticks and the new value gets | |
118 | * latched. | |
3d9edf09 | 119 | */ |
3d9edf09 VB |
120 | static inline int gpio_get_value(unsigned gpio) |
121 | { | |
c12f415a | 122 | struct davinci_gpio_controller *ctlr; |
3d9edf09 | 123 | |
c12f415a | 124 | if (!__builtin_constant_p(gpio) || gpio >= davinci_soc_info.gpio_num) |
dce1115b | 125 | return __gpio_get_value(gpio); |
3d9edf09 | 126 | |
c12f415a CC |
127 | ctlr = __gpio_to_controller(gpio); |
128 | return __gpio_mask(gpio) & __raw_readl(ctlr->in_data); | |
3d9edf09 VB |
129 | } |
130 | ||
dce1115b DB |
131 | static inline int gpio_cansleep(unsigned gpio) |
132 | { | |
c12f415a | 133 | if (__builtin_constant_p(gpio) && gpio < davinci_soc_info.gpio_num) |
dce1115b DB |
134 | return 0; |
135 | else | |
136 | return __gpio_cansleep(gpio); | |
137 | } | |
3d9edf09 VB |
138 | |
139 | static inline int gpio_to_irq(unsigned gpio) | |
140 | { | |
7a36071e | 141 | return __gpio_to_irq(gpio); |
3d9edf09 VB |
142 | } |
143 | ||
144 | static inline int irq_to_gpio(unsigned irq) | |
145 | { | |
7a36071e DB |
146 | /* don't support the reverse mapping */ |
147 | return -ENOSYS; | |
3d9edf09 VB |
148 | } |
149 | ||
150 | #endif /* __DAVINCI_GPIO_H */ |