1/* SPDX-License-Identifier: GPL-2.0+ */
2/*
3 * Copyright 2010 eXMeritus, A Boeing Company
4 */
5
6#ifndef POWERPC_ASM_MPC85XX_GPIO_H_
7#define POWERPC_ASM_MPC85XX_GPIO_H_
8
9#ifndef CONFIG_DM_GPIO
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{
23	ccsr_gpio_t *gpio = (void *)(CFG_SYS_MPC85xx_GPIO_ADDR);
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
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{
59	ccsr_gpio_t *gpio = (void *)(CFG_SYS_MPC85xx_GPIO_ADDR);
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 */
69static inline int gpio_request(unsigned gpio, const char *label)
70{
71	/* Compatibility shim */
72	return 0;
73}
74
75static inline int gpio_free(unsigned gpio)
76{
77	/* Compatibility shim */
78	return 0;
79}
80
81static inline int gpio_direction_input(unsigned gpio)
82{
83	mpc85xx_gpio_set_in(1U << gpio);
84	return 0;
85}
86
87static inline int gpio_direction_output(unsigned gpio, int value)
88{
89	if (value)
90		mpc85xx_gpio_set_high(1U << gpio);
91	else
92		mpc85xx_gpio_set_low(1U << gpio);
93	return 0;
94}
95
96static inline int gpio_get_value(unsigned gpio)
97{
98	return !!mpc85xx_gpio_get(1U << gpio);
99}
100
101static inline int gpio_set_value(unsigned gpio, int value)
102{
103	if (value)
104		mpc85xx_gpio_set_high(1U << gpio);
105	else
106		mpc85xx_gpio_set_low(1U << gpio);
107	return 0;
108}
109
110static inline int gpio_is_valid(int gpio)
111{
112	return (gpio >= 0) && (gpio < 32);
113}
114#endif /* not CONFIG_DM_GPIO */
115#endif /* not POWERPC_ASM_MPC85XX_GPIO_H_ */
116