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 */
mpc85xx_gpio_set(unsigned int mask,unsigned int dir,unsigned int val)20 static inline void mpc85xx_gpio_set(unsigned int mask,
21 unsigned int dir, unsigned int val)
22 {
23 ccsr_gpio_t *gpio = (void *)(CONFIG_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
mpc85xx_gpio_set_in(unsigned int gpios)42 static inline void mpc85xx_gpio_set_in(unsigned int gpios)
43 {
44 mpc85xx_gpio_set(gpios, 0x00000000, 0x00000000);
45 }
46
mpc85xx_gpio_set_low(unsigned int gpios)47 static inline void mpc85xx_gpio_set_low(unsigned int gpios)
48 {
49 mpc85xx_gpio_set(gpios, 0xFFFFFFFF, 0x00000000);
50 }
51
mpc85xx_gpio_set_high(unsigned int gpios)52 static inline void mpc85xx_gpio_set_high(unsigned int gpios)
53 {
54 mpc85xx_gpio_set(gpios, 0xFFFFFFFF, 0xFFFFFFFF);
55 }
56
mpc85xx_gpio_get(unsigned int mask)57 static inline unsigned int mpc85xx_gpio_get(unsigned int mask)
58 {
59 ccsr_gpio_t *gpio = (void *)(CONFIG_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 */
gpio_request(unsigned gpio,const char * label)69 static inline int gpio_request(unsigned gpio, const char *label)
70 {
71 /* Compatibility shim */
72 return 0;
73 }
74
gpio_free(unsigned gpio)75 static inline int gpio_free(unsigned gpio)
76 {
77 /* Compatibility shim */
78 return 0;
79 }
80
gpio_direction_input(unsigned gpio)81 static inline int gpio_direction_input(unsigned gpio)
82 {
83 mpc85xx_gpio_set_in(1U << gpio);
84 return 0;
85 }
86
gpio_direction_output(unsigned gpio,int value)87 static 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
gpio_get_value(unsigned gpio)96 static inline int gpio_get_value(unsigned gpio)
97 {
98 return !!mpc85xx_gpio_get(1U << gpio);
99 }
100
gpio_set_value(unsigned gpio,int value)101 static 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
gpio_is_valid(int gpio)110 static 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