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710308ee KM |
1 | /* |
2 | * Copyright 2010 eXMeritus, A Boeing Company | |
3 | * | |
1a459660 | 4 | * SPDX-License-Identifier: GPL-2.0+ |
710308ee KM |
5 | */ |
6 | ||
7 | #ifndef POWERPC_ASM_MPC85XX_GPIO_H_ | |
8 | #define POWERPC_ASM_MPC85XX_GPIO_H_ | |
9 | ||
10 | # include <asm/immap_85xx.h> | |
11 | ||
12 | /* | |
13 | * The following internal functions are an MPC85XX-specific GPIO API which | |
14 | * allows setting and querying multiple GPIOs in a single operation. | |
15 | * | |
16 | * All of these look relatively large, but the arguments are almost always | |
17 | * constants, so they compile down to just a few instructions and a | |
18 | * memory-mapped IO operation or two. | |
19 | */ | |
20 | static inline void mpc85xx_gpio_set(unsigned int mask, | |
21 | unsigned int dir, unsigned int val) | |
22 | { | |
f40fcfd9 | 23 | ccsr_gpio_t *gpio = (void *)(CONFIG_SYS_MPC85xx_GPIO_ADDR); |
710308ee KM |
24 | |
25 | /* First mask off the unwanted parts of "dir" and "val" */ | |
26 | dir &= mask; | |
27 | val &= mask; | |
28 | ||
29 | /* Now read in the values we're supposed to preserve */ | |
30 | dir |= (in_be32(&gpio->gpdir) & ~mask); | |
31 | val |= (in_be32(&gpio->gpdat) & ~mask); | |
32 | ||
33 | /* | |
34 | * Poke the new output values first, then set the direction. This | |
35 | * helps to avoid transient data when switching from input to output | |
36 | * and vice versa. | |
37 | */ | |
38 | out_be32(&gpio->gpdat, val); | |
39 | out_be32(&gpio->gpdir, dir); | |
40 | } | |
41 | ||
42 | static inline void mpc85xx_gpio_set_in(unsigned int gpios) | |
43 | { | |
44 | mpc85xx_gpio_set(gpios, 0x00000000, 0x00000000); | |
45 | } | |
46 | ||
47 | static inline void mpc85xx_gpio_set_low(unsigned int gpios) | |
48 | { | |
49 | mpc85xx_gpio_set(gpios, 0xFFFFFFFF, 0x00000000); | |
50 | } | |
51 | ||
52 | static inline void mpc85xx_gpio_set_high(unsigned int gpios) | |
53 | { | |
54 | mpc85xx_gpio_set(gpios, 0xFFFFFFFF, 0xFFFFFFFF); | |
55 | } | |
56 | ||
57 | static inline unsigned int mpc85xx_gpio_get(unsigned int mask) | |
58 | { | |
f40fcfd9 | 59 | ccsr_gpio_t *gpio = (void *)(CONFIG_SYS_MPC85xx_GPIO_ADDR); |
710308ee KM |
60 | |
61 | /* Read the requested values */ | |
62 | return in_be32(&gpio->gpdat) & mask; | |
63 | } | |
64 | ||
65 | /* | |
66 | * These implement the generic Linux GPIO API on top of the other functions | |
67 | * in this header. | |
68 | */ | |
69 | static inline int gpio_request(unsigned gpio, const char *label) | |
70 | { | |
71 | /* Compatibility shim */ | |
72 | return 0; | |
73 | } | |
74 | ||
75 | static inline void gpio_free(unsigned gpio) | |
76 | { | |
77 | /* Compatibility shim */ | |
78 | } | |
79 | ||
80 | static inline int gpio_direction_input(unsigned gpio) | |
81 | { | |
82 | mpc85xx_gpio_set_in(1U << gpio); | |
83 | return 0; | |
84 | } | |
85 | ||
86 | static inline int gpio_direction_output(unsigned gpio, int value) | |
87 | { | |
168e5bc4 CP |
88 | if (value) |
89 | mpc85xx_gpio_set_high(1U << gpio); | |
90 | else | |
91 | mpc85xx_gpio_set_low(1U << gpio); | |
710308ee KM |
92 | return 0; |
93 | } | |
94 | ||
95 | static inline int gpio_get_value(unsigned gpio) | |
96 | { | |
97 | return !!mpc85xx_gpio_get(1U << gpio); | |
98 | } | |
99 | ||
100 | static inline void gpio_set_value(unsigned gpio, int value) | |
101 | { | |
102 | if (value) | |
103 | mpc85xx_gpio_set_high(1U << gpio); | |
104 | else | |
105 | mpc85xx_gpio_set_low(1U << gpio); | |
106 | } | |
107 | ||
108 | static inline int gpio_is_valid(int gpio) | |
109 | { | |
110 | return (gpio >= 0) && (gpio < 32); | |
111 | } | |
112 | ||
113 | #endif /* not POWERPC_ASM_MPC85XX_GPIO_H_ */ |