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/*
* Copyright (C) 2021 Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include <errno.h>
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <sys/mman.h>
/* uint32_t bank_con_addr; */
/* uint32_t bank_dat_addr; */
/* uint32_t bank_pud_addr; */
/* uint32_t bank_drv_addr; */
/* uint32_t bank_con_pdn_addr; */
/* uint32_t bank_pud_pdn_addr; */
/* if (!strcmp(bank, "gpj1")){ */
/* bank_con_addr = 0x11400260; /\* GPJ1CON *\/ */
/* bank_dat_addr = 0x11400264; /\* GPJ1DAT *\/ */
/* bank_pud_addr = 0x11400268; /\* GPJ1PUD *\/ */
/* bank_drv_addr = 0x1140026c; /\* GPJ1DRV *\/ */
/* bank_con_pdn_addr = 0x11440270; /\* GPJ1CONPDN *\/ */
/* bank_pud_pdn_addr = 0x11440274; /\* GPJ1PUDPDN *\/ */
/* } else { */
/* errno = -EINVAL; */
/* return NULL; */
/* } */
enum gpio_direction {
GPIO_INPUT = 0,
GPIO_OUTPUT = 1,
/* The rest of the values up to 0xf seem to be dependent on the pin */
};
static char *gpio_direction_str(int value)
{
/* The GP<x>CON field size is 4 bits. So the maximum value it can take
* is 0xf. So to convert that to string, if we add the trailing \0, the
* size of the the string is 4.
*/
static char result[4] = { 0 };
switch (value) {
case GPIO_INPUT:
return "GPIO_INPUT";
case GPIO_OUTPUT:
return "GPIO_OUTPUT";
default:
snprintf(result, sizeof(result), "0x%x", value);
return (char*)result;
}
}
static int decode_bank_con(char *bank, uint32_t gpio_offset, uint32_t *virt_addr)
{
int shift = 0;
int result = 0;
char* direction;
uint32_t *addr;
uint32_t value;
printf("%s: Mapped at %p\n", __func__, virt_addr);
if (!strcmp(bank, "gpj1")) {
addr = virt_addr + 0x260;
value = *virt_addr;
printf("%s: %s: offset %p value: 0x%x\n", __func__, bank,
addr - virt_addr, value);
} else {
errno = EINVAL;
return -1;
}
result = ((value >> (gpio_offset * 4)) & 0xf);
direction = gpio_direction_str(result);
printf("%s: %s[%d]: %s\n", __func__, bank, gpio_offset,
gpio_direction_str(result));
return 0;
}
static void *mmap_gpio_bank(char *devmem, int fd, size_t page_size, char *bank)
{
/* TODO: also map GPIO_right
* GPIO_right: base_addr: 0x11000000 len: 0x400000
* GPIO_left: base_addr: 0x11400000 len: 0x400000
*/
uint32_t base_addr = 0x11400000;
size_t len = 0x400000;
void *map_base_addr;
uint32_t *virt_addr;
int rc;
map_base_addr = mmap(0, len, PROT_READ|PROT_WRITE, MAP_SHARED, fd,
base_addr & ~(page_size -1));
if (map_base_addr == MAP_FAILED) {
rc = errno;
printf("mmap on %s failed with error %d: %s\n",
devmem, rc, strerror(rc));
}
virt_addr = map_base_addr + (base_addr & 4095) + 0x260;
return virt_addr;
}
int dump_gpio_infos(char *devmem, int fd, size_t page_size, char *bank,
uint32_t gpio_offset)
{
uint32_t *addr;
int rc;
addr = mmap_gpio_bank(devmem, fd, page_size, "gpj1");
printf("%s: Mapped at %p\n", __func__, addr);
rc = decode_bank_con("gpj1", 1, addr);
if (rc == -1) {
rc = errno;
printf("decode_gpio(\"%s\", %d, 0x%x); "
"failed with with error %d: %s\n",
"gpj1", 1, *addr, rc, strerror(rc));
return -1;
}
}
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