1*4882a593Smuzhiyun /*
2*4882a593Smuzhiyun * Copyright 2010 eXMeritus, A Boeing Company
3*4882a593Smuzhiyun *
4*4882a593Smuzhiyun * SPDX-License-Identifier: GPL-2.0+
5*4882a593Smuzhiyun */
6*4882a593Smuzhiyun
7*4882a593Smuzhiyun #ifndef POWERPC_ASM_MPC85XX_GPIO_H_
8*4882a593Smuzhiyun #define POWERPC_ASM_MPC85XX_GPIO_H_
9*4882a593Smuzhiyun
10*4882a593Smuzhiyun # include <asm/immap_85xx.h>
11*4882a593Smuzhiyun
12*4882a593Smuzhiyun /*
13*4882a593Smuzhiyun * The following internal functions are an MPC85XX-specific GPIO API which
14*4882a593Smuzhiyun * allows setting and querying multiple GPIOs in a single operation.
15*4882a593Smuzhiyun *
16*4882a593Smuzhiyun * All of these look relatively large, but the arguments are almost always
17*4882a593Smuzhiyun * constants, so they compile down to just a few instructions and a
18*4882a593Smuzhiyun * memory-mapped IO operation or two.
19*4882a593Smuzhiyun */
mpc85xx_gpio_set(unsigned int mask,unsigned int dir,unsigned int val)20*4882a593Smuzhiyun static inline void mpc85xx_gpio_set(unsigned int mask,
21*4882a593Smuzhiyun unsigned int dir, unsigned int val)
22*4882a593Smuzhiyun {
23*4882a593Smuzhiyun ccsr_gpio_t *gpio = (void *)(CONFIG_SYS_MPC85xx_GPIO_ADDR);
24*4882a593Smuzhiyun
25*4882a593Smuzhiyun /* First mask off the unwanted parts of "dir" and "val" */
26*4882a593Smuzhiyun dir &= mask;
27*4882a593Smuzhiyun val &= mask;
28*4882a593Smuzhiyun
29*4882a593Smuzhiyun /* Now read in the values we're supposed to preserve */
30*4882a593Smuzhiyun dir |= (in_be32(&gpio->gpdir) & ~mask);
31*4882a593Smuzhiyun val |= (in_be32(&gpio->gpdat) & ~mask);
32*4882a593Smuzhiyun
33*4882a593Smuzhiyun /*
34*4882a593Smuzhiyun * Poke the new output values first, then set the direction. This
35*4882a593Smuzhiyun * helps to avoid transient data when switching from input to output
36*4882a593Smuzhiyun * and vice versa.
37*4882a593Smuzhiyun */
38*4882a593Smuzhiyun out_be32(&gpio->gpdat, val);
39*4882a593Smuzhiyun out_be32(&gpio->gpdir, dir);
40*4882a593Smuzhiyun }
41*4882a593Smuzhiyun
mpc85xx_gpio_set_in(unsigned int gpios)42*4882a593Smuzhiyun static inline void mpc85xx_gpio_set_in(unsigned int gpios)
43*4882a593Smuzhiyun {
44*4882a593Smuzhiyun mpc85xx_gpio_set(gpios, 0x00000000, 0x00000000);
45*4882a593Smuzhiyun }
46*4882a593Smuzhiyun
mpc85xx_gpio_set_low(unsigned int gpios)47*4882a593Smuzhiyun static inline void mpc85xx_gpio_set_low(unsigned int gpios)
48*4882a593Smuzhiyun {
49*4882a593Smuzhiyun mpc85xx_gpio_set(gpios, 0xFFFFFFFF, 0x00000000);
50*4882a593Smuzhiyun }
51*4882a593Smuzhiyun
mpc85xx_gpio_set_high(unsigned int gpios)52*4882a593Smuzhiyun static inline void mpc85xx_gpio_set_high(unsigned int gpios)
53*4882a593Smuzhiyun {
54*4882a593Smuzhiyun mpc85xx_gpio_set(gpios, 0xFFFFFFFF, 0xFFFFFFFF);
55*4882a593Smuzhiyun }
56*4882a593Smuzhiyun
mpc85xx_gpio_get(unsigned int mask)57*4882a593Smuzhiyun static inline unsigned int mpc85xx_gpio_get(unsigned int mask)
58*4882a593Smuzhiyun {
59*4882a593Smuzhiyun ccsr_gpio_t *gpio = (void *)(CONFIG_SYS_MPC85xx_GPIO_ADDR);
60*4882a593Smuzhiyun
61*4882a593Smuzhiyun /* Read the requested values */
62*4882a593Smuzhiyun return in_be32(&gpio->gpdat) & mask;
63*4882a593Smuzhiyun }
64*4882a593Smuzhiyun
65*4882a593Smuzhiyun /*
66*4882a593Smuzhiyun * These implement the generic Linux GPIO API on top of the other functions
67*4882a593Smuzhiyun * in this header.
68*4882a593Smuzhiyun */
gpio_request(unsigned gpio,const char * label)69*4882a593Smuzhiyun static inline int gpio_request(unsigned gpio, const char *label)
70*4882a593Smuzhiyun {
71*4882a593Smuzhiyun /* Compatibility shim */
72*4882a593Smuzhiyun return 0;
73*4882a593Smuzhiyun }
74*4882a593Smuzhiyun
gpio_free(unsigned gpio)75*4882a593Smuzhiyun static inline int gpio_free(unsigned gpio)
76*4882a593Smuzhiyun {
77*4882a593Smuzhiyun /* Compatibility shim */
78*4882a593Smuzhiyun return 0;
79*4882a593Smuzhiyun }
80*4882a593Smuzhiyun
gpio_direction_input(unsigned gpio)81*4882a593Smuzhiyun static inline int gpio_direction_input(unsigned gpio)
82*4882a593Smuzhiyun {
83*4882a593Smuzhiyun mpc85xx_gpio_set_in(1U << gpio);
84*4882a593Smuzhiyun return 0;
85*4882a593Smuzhiyun }
86*4882a593Smuzhiyun
gpio_direction_output(unsigned gpio,int value)87*4882a593Smuzhiyun static inline int gpio_direction_output(unsigned gpio, int value)
88*4882a593Smuzhiyun {
89*4882a593Smuzhiyun if (value)
90*4882a593Smuzhiyun mpc85xx_gpio_set_high(1U << gpio);
91*4882a593Smuzhiyun else
92*4882a593Smuzhiyun mpc85xx_gpio_set_low(1U << gpio);
93*4882a593Smuzhiyun return 0;
94*4882a593Smuzhiyun }
95*4882a593Smuzhiyun
gpio_get_value(unsigned gpio)96*4882a593Smuzhiyun static inline int gpio_get_value(unsigned gpio)
97*4882a593Smuzhiyun {
98*4882a593Smuzhiyun return !!mpc85xx_gpio_get(1U << gpio);
99*4882a593Smuzhiyun }
100*4882a593Smuzhiyun
gpio_set_value(unsigned gpio,int value)101*4882a593Smuzhiyun static inline int gpio_set_value(unsigned gpio, int value)
102*4882a593Smuzhiyun {
103*4882a593Smuzhiyun if (value)
104*4882a593Smuzhiyun mpc85xx_gpio_set_high(1U << gpio);
105*4882a593Smuzhiyun else
106*4882a593Smuzhiyun mpc85xx_gpio_set_low(1U << gpio);
107*4882a593Smuzhiyun return 0;
108*4882a593Smuzhiyun }
109*4882a593Smuzhiyun
gpio_is_valid(int gpio)110*4882a593Smuzhiyun static inline int gpio_is_valid(int gpio)
111*4882a593Smuzhiyun {
112*4882a593Smuzhiyun return (gpio >= 0) && (gpio < 32);
113*4882a593Smuzhiyun }
114*4882a593Smuzhiyun
115*4882a593Smuzhiyun #endif /* not POWERPC_ASM_MPC85XX_GPIO_H_ */
116