1 /*
2 * (C) Copyright 2008 Stefan Roese <sr@denx.de>, DENX Software Engineering
3 *
4 * SPDX-License-Identifier: GPL-2.0+
5 */
6
7 #include <common.h>
8 #include <asm/io.h>
9 #include "vct.h"
10
11 /*
12 * Find out to which of the 2 gpio modules the pin specified in the
13 * argument belongs:
14 * GPIO_MODULE yields 0 for pins 0 to 31,
15 * 1 for pins 32 to 63
16 */
17 #define GPIO_MODULE(pin) ((pin) >> 5)
18
19 /*
20 * Bit position within a 32-bit peripheral register (where every
21 * bit is one bitslice)
22 */
23 #define MASK(pin) (1 << ((pin) & 0x1F))
24 #define BASE_ADDR(mod) module_base[mod]
25
26 /*
27 * Lookup table for transforming gpio module number 0 to 2 to
28 * address offsets
29 */
30 static u32 module_base[] = {
31 GPIO1_BASE,
32 GPIO2_BASE
33 };
34
clrsetbits(u32 addr,u32 and_mask,u32 or_mask)35 static void clrsetbits(u32 addr, u32 and_mask, u32 or_mask)
36 {
37 reg_write(addr, (reg_read(addr) & ~and_mask) | or_mask);
38 }
39
vct_gpio_dir(int pin,int dir)40 int vct_gpio_dir(int pin, int dir)
41 {
42 u32 gpio_base;
43
44 gpio_base = BASE_ADDR(GPIO_MODULE(pin));
45
46 if (dir == 0)
47 clrsetbits(GPIO_SWPORTA_DDR(gpio_base), MASK(pin), 0);
48 else
49 clrsetbits(GPIO_SWPORTA_DDR(gpio_base), 0, MASK(pin));
50
51 return 0;
52 }
53
vct_gpio_set(int pin,int val)54 void vct_gpio_set(int pin, int val)
55 {
56 u32 gpio_base;
57
58 gpio_base = BASE_ADDR(GPIO_MODULE(pin));
59
60 if (val == 0)
61 clrsetbits(GPIO_SWPORTA_DR(gpio_base), MASK(pin), 0);
62 else
63 clrsetbits(GPIO_SWPORTA_DR(gpio_base), 0, MASK(pin));
64 }
65
vct_gpio_get(int pin)66 int vct_gpio_get(int pin)
67 {
68 u32 gpio_base;
69 u32 value;
70
71 gpio_base = BASE_ADDR(GPIO_MODULE(pin));
72 value = reg_read(GPIO_EXT_PORTA(gpio_base));
73
74 return ((value & MASK(pin)) ? 1 : 0);
75 }
76