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Kyle Moffett710308e2011-10-19 14:58:15 -04001/*
2 * Copyright 2010 eXMeritus, A Boeing Company
3 *
Wolfgang Denk1a459662013-07-08 09:37:19 +02004 * SPDX-License-Identifier: GPL-2.0+
Kyle Moffett710308e2011-10-19 14:58:15 -04005 */
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 */
20static inline void mpc85xx_gpio_set(unsigned int mask,
21 unsigned int dir, unsigned int val)
22{
Tang Yuantianf40fcfd2013-10-17 10:47:33 +080023 ccsr_gpio_t *gpio = (void *)(CONFIG_SYS_MPC85xx_GPIO_ADDR);
Kyle Moffett710308e2011-10-19 14:58:15 -040024
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
42static inline void mpc85xx_gpio_set_in(unsigned int gpios)
43{
44 mpc85xx_gpio_set(gpios, 0x00000000, 0x00000000);
45}
46
47static inline void mpc85xx_gpio_set_low(unsigned int gpios)
48{
49 mpc85xx_gpio_set(gpios, 0xFFFFFFFF, 0x00000000);
50}
51
52static inline void mpc85xx_gpio_set_high(unsigned int gpios)
53{
54 mpc85xx_gpio_set(gpios, 0xFFFFFFFF, 0xFFFFFFFF);
55}
56
57static inline unsigned int mpc85xx_gpio_get(unsigned int mask)
58{
Tang Yuantianf40fcfd2013-10-17 10:47:33 +080059 ccsr_gpio_t *gpio = (void *)(CONFIG_SYS_MPC85xx_GPIO_ADDR);
Kyle Moffett710308e2011-10-19 14:58:15 -040060
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 */
69static inline int gpio_request(unsigned gpio, const char *label)
70{
71 /* Compatibility shim */
72 return 0;
73}
74
75static inline void gpio_free(unsigned gpio)
76{
77 /* Compatibility shim */
78}
79
80static inline int gpio_direction_input(unsigned gpio)
81{
82 mpc85xx_gpio_set_in(1U << gpio);
83 return 0;
84}
85
86static inline int gpio_direction_output(unsigned gpio, int value)
87{
Chris Packham168e5bc2012-09-06 17:28:35 +000088 if (value)
89 mpc85xx_gpio_set_high(1U << gpio);
90 else
91 mpc85xx_gpio_set_low(1U << gpio);
Kyle Moffett710308e2011-10-19 14:58:15 -040092 return 0;
93}
94
95static inline int gpio_get_value(unsigned gpio)
96{
97 return !!mpc85xx_gpio_get(1U << gpio);
98}
99
100static 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
108static inline int gpio_is_valid(int gpio)
109{
110 return (gpio >= 0) && (gpio < 32);
111}
112
113#endif /* not POWERPC_ASM_MPC85XX_GPIO_H_ */