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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>
#include "exynos4412_gpios.h"
#include "exynos4412_gpios_data.h"
void *mmap_gpio_bank(int debug, 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 = 0x11000000;
size_t len = 0x800000;
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));
errno = rc;
return NULL;
}
virt_addr = map_base_addr + (base_addr & 4095);
if (debug) {
printf("%s: mapped address 0x%x @ %p\n", __func__, 0,
map_base_addr);
printf("%s: mapped 0x%x bytes of address 0x%x @ %p\n", __func__,
len, base_addr, virt_addr);
}
return virt_addr;
}
int dump_gpio_infos(int debug, char *devmem, int fd, size_t page_size,
char *bank, uint32_t gpio_offset)
{
uint32_t *addr;
int rc;
int i = 0;
off_t offset = 0;
char* gpio_registers[] = { "con", "dat", "pud", "drv" };
offset = get_gpio_register_offset(debug, bank, "con");
if (offset == -1) {
rc = errno;
printf("%s: get_gpio_register_offset failed with error %d: %s\n",
__func__, rc, strerror(rc));
return -1;
}
addr = mmap_gpio_bank(debug, devmem, fd, page_size, bank) + offset;
if (debug) {
printf("%s: Mapped at %p\n", __func__, addr);
print_gpio_banks_data();
}
printf("%s: %s[%d]: {\n", __func__, bank, gpio_offset);
for (i=0; i< sizeof(gpio_registers) / sizeof (char*); i++) {
rc = decode_gpio_data(debug, bank, gpio_offset,
gpio_registers[i], addr);
if (rc == -1) {
rc = errno;
printf("%s:"
" decode_gpio_data(debug=%d,"
" bank=%s,"
" gpio_offset=%d,"
" gpio_register_name=%s,"
" addr=%p);"
" failed with with error %d: %s\n",
__func__,
debug,
bank,
gpio_offset,
gpio_registers[i],
addr,
rc, strerror(rc));
return -1;
}
printf(" %s\n", gpio_data_str(gpio_registers[i], rc));
}
printf("}\n");
return 0;
}
int gpio_get_direction(char *devmem, int fd, size_t page_size, char *bank,
uint32_t gpio_offset)
{
int debug = 0;
uint32_t *addr;
int rc;
off_t offset = 0;
offset = get_gpio_register_offset(debug, bank, "con");
if (offset == -1) {
rc = errno;
printf("%s: get_gpio_register_offset failed with error %d: %s\n",
__func__, rc, strerror(rc));
return -1;
}
addr = mmap_gpio_bank(debug, devmem, fd, page_size, bank) + offset;
if (addr == NULL) {
/* mmap_gpio_bank already prints an error */
return -1;
}
if (debug) {
printf("%s: Mapped at %p\n", __func__, addr);
print_gpio_banks_data();
}
rc = decode_gpio_data(debug, bank, gpio_offset,
"con", addr);
if (rc == -1) {
rc = errno;
printf("%s:"
" decode_gpio_data(debug=%d,"
" bank=%s,"
" gpio_offset=%d,"
" gpio_register_name=%s,"
" addr=%p);"
" failed with with error %d: %s\n",
__func__,
debug,
bank,
gpio_offset,
"con",
addr,
rc, strerror(rc));
return -1;
}
return rc;
}
int gpio_get_output_value(char *devmem, int fd, size_t page_size, char *bank,
uint32_t gpio_offset)
{
int debug = 0;
uint32_t *addr;
int rc;
off_t offset = 0;
offset = get_gpio_register_offset(debug, bank, "dat");
if (offset == -1) {
rc = errno;
printf("%s: get_gpio_register_offset failed with error %d: %s\n",
__func__, rc, strerror(rc));
return -1;
}
if (debug){
printf("%s: offset for %s: 0x%lx\n\n",
__func__, bank, offset);
}
addr = mmap_gpio_bank(debug, devmem, fd, page_size, bank) + offset;
if (addr == NULL) {
/* mmap_gpio_bank already prints an error */
return -1;
}
if (debug) {
printf("%s: Mapped at %p\n", __func__, addr);
print_gpio_banks_data();
}
rc = decode_gpio_data(debug, bank, gpio_offset,
"dat", addr);
if (rc == -1) {
rc = errno;
printf("%s:"
" decode_gpio_data(debug=%d,"
" bank=%s,"
" gpio_offset=%d,"
" gpio_register_name=%s,"
" addr=%p);"
" failed with with error %d: %s\n",
__func__,
debug,
bank,
gpio_offset,
"dat",
addr,
rc, strerror(rc));
return -1;
}
return rc;
}
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