1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright 2013 Broadcom Corporation.
4 */
5
6 #include <common.h>
7 #include <asm/io.h>
8 #include <asm/arch/sysmap.h>
9
10 #define GPIO_BASE (void *)GPIO2_BASE_ADDR
11
12 #define GPIO_PASSWD 0x00a5a501
13 #define GPIO_PER_BANK 32
14 #define GPIO_MAX_BANK_NUM 8
15
16 #define GPIO_BANK(gpio) ((gpio) >> 5)
17 #define GPIO_BITMASK(gpio) \
18 (1UL << ((gpio) & (GPIO_PER_BANK - 1)))
19
20 #define GPIO_OUT_STATUS(bank) (0x00000000 + ((bank) << 2))
21 #define GPIO_IN_STATUS(bank) (0x00000020 + ((bank) << 2))
22 #define GPIO_OUT_SET(bank) (0x00000040 + ((bank) << 2))
23 #define GPIO_OUT_CLEAR(bank) (0x00000060 + ((bank) << 2))
24 #define GPIO_INT_STATUS(bank) (0x00000080 + ((bank) << 2))
25 #define GPIO_INT_MASK(bank) (0x000000a0 + ((bank) << 2))
26 #define GPIO_INT_MSKCLR(bank) (0x000000c0 + ((bank) << 2))
27 #define GPIO_CONTROL(bank) (0x00000100 + ((bank) << 2))
28 #define GPIO_PWD_STATUS(bank) (0x00000500 + ((bank) << 2))
29
30 #define GPIO_GPPWR_OFFSET 0x00000520
31
32 #define GPIO_GPCTR0_DBR_SHIFT 5
33 #define GPIO_GPCTR0_DBR_MASK 0x000001e0
34
35 #define GPIO_GPCTR0_ITR_SHIFT 3
36 #define GPIO_GPCTR0_ITR_MASK 0x00000018
37 #define GPIO_GPCTR0_ITR_CMD_RISING_EDGE 0x00000001
38 #define GPIO_GPCTR0_ITR_CMD_FALLING_EDGE 0x00000002
39 #define GPIO_GPCTR0_ITR_CMD_BOTH_EDGE 0x00000003
40
41 #define GPIO_GPCTR0_IOTR_MASK 0x00000001
42 #define GPIO_GPCTR0_IOTR_CMD_0UTPUT 0x00000000
43 #define GPIO_GPCTR0_IOTR_CMD_INPUT 0x00000001
44
gpio_request(unsigned gpio,const char * label)45 int gpio_request(unsigned gpio, const char *label)
46 {
47 unsigned int value, off;
48
49 writel(GPIO_PASSWD, GPIO_BASE + GPIO_GPPWR_OFFSET);
50 off = GPIO_PWD_STATUS(GPIO_BANK(gpio));
51 value = readl(GPIO_BASE + off) & ~GPIO_BITMASK(gpio);
52 writel(value, GPIO_BASE + off);
53
54 return 0;
55 }
56
gpio_free(unsigned gpio)57 int gpio_free(unsigned gpio)
58 {
59 unsigned int value, off;
60
61 writel(GPIO_PASSWD, GPIO_BASE + GPIO_GPPWR_OFFSET);
62 off = GPIO_PWD_STATUS(GPIO_BANK(gpio));
63 value = readl(GPIO_BASE + off) | GPIO_BITMASK(gpio);
64 writel(value, GPIO_BASE + off);
65
66 return 0;
67 }
68
gpio_direction_input(unsigned gpio)69 int gpio_direction_input(unsigned gpio)
70 {
71 u32 val;
72
73 val = readl(GPIO_BASE + GPIO_CONTROL(gpio));
74 val &= ~GPIO_GPCTR0_IOTR_MASK;
75 val |= GPIO_GPCTR0_IOTR_CMD_INPUT;
76 writel(val, GPIO_BASE + GPIO_CONTROL(gpio));
77
78 return 0;
79 }
80
gpio_direction_output(unsigned gpio,int value)81 int gpio_direction_output(unsigned gpio, int value)
82 {
83 int bank_id = GPIO_BANK(gpio);
84 int bitmask = GPIO_BITMASK(gpio);
85 u32 val, off;
86
87 val = readl(GPIO_BASE + GPIO_CONTROL(gpio));
88 val &= ~GPIO_GPCTR0_IOTR_MASK;
89 val |= GPIO_GPCTR0_IOTR_CMD_0UTPUT;
90 writel(val, GPIO_BASE + GPIO_CONTROL(gpio));
91 off = value ? GPIO_OUT_SET(bank_id) : GPIO_OUT_CLEAR(bank_id);
92
93 val = readl(GPIO_BASE + off);
94 val |= bitmask;
95 writel(val, GPIO_BASE + off);
96
97 return 0;
98 }
99
gpio_get_value(unsigned gpio)100 int gpio_get_value(unsigned gpio)
101 {
102 int bank_id = GPIO_BANK(gpio);
103 int bitmask = GPIO_BITMASK(gpio);
104 u32 val, off;
105
106 /* determine the GPIO pin direction */
107 val = readl(GPIO_BASE + GPIO_CONTROL(gpio));
108 val &= GPIO_GPCTR0_IOTR_MASK;
109
110 /* read the GPIO bank status */
111 off = (GPIO_GPCTR0_IOTR_CMD_INPUT == val) ?
112 GPIO_IN_STATUS(bank_id) : GPIO_OUT_STATUS(bank_id);
113 val = readl(GPIO_BASE + off);
114
115 /* return the specified bit status */
116 return !!(val & bitmask);
117 }
118
gpio_set_value(unsigned gpio,int value)119 void gpio_set_value(unsigned gpio, int value)
120 {
121 int bank_id = GPIO_BANK(gpio);
122 int bitmask = GPIO_BITMASK(gpio);
123 u32 val, off;
124
125 /* determine the GPIO pin direction */
126 val = readl(GPIO_BASE + GPIO_CONTROL(gpio));
127 val &= GPIO_GPCTR0_IOTR_MASK;
128
129 /* this function only applies to output pin */
130 if (GPIO_GPCTR0_IOTR_CMD_INPUT == val) {
131 printf("%s: Cannot set an input pin %d\n", __func__, gpio);
132 return;
133 }
134
135 off = value ? GPIO_OUT_SET(bank_id) : GPIO_OUT_CLEAR(bank_id);
136
137 val = readl(GPIO_BASE + off);
138 val |= bitmask;
139 writel(val, GPIO_BASE + off);
140 }
141