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