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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 <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include "memory.h"
struct gpio_block {
off_t mmap_phys_base;
off_t *mmap_virt_base;
off_t mmap_length;
};
struct memory_mapping {
struct gpio_block gpio_left;
struct gpio_block gpio_right;
};
static bool addr_is_gpioleft(struct memory_mapping *memory_mapping, off_t addr)
{
if (addr < memory_mapping->gpio_left.mmap_phys_base)
return false;
if (addr > (memory_mapping->gpio_left.mmap_phys_base +
memory_mapping->gpio_left.mmap_length))
return false;
return true;
}
static bool addr_is_gpioright(struct memory_mapping *memory_mapping, off_t addr)
{
if (addr < memory_mapping->gpio_right.mmap_phys_base)
return false;
if (addr > (memory_mapping->gpio_right.mmap_phys_base +
memory_mapping->gpio_right.mmap_length))
return false;
return true;
}
int init_memory_mapping(int debug, struct memory_mapping **memory_mapping_pp)
{
int fd;
int rc;
char *devmem = "/dev/mem";
struct memory_mapping *memory_mapping;
memory_mapping = malloc(sizeof(struct memory_mapping));
if (memory_mapping == NULL) {
rc = errno;
printf("%s: malloc failed with error %d: %s\n",
__func__, rc, strerror(rc));
return -1;
}
fd = open(devmem, O_RDWR | O_SYNC);
if (fd == -1) {
rc = errno;
printf("%s: opening %s failed with error %d: %s\n",
__func__, devmem, rc, strerror(rc));
return -1;
}
memory_mapping->gpio_right.mmap_phys_base = 0x11000000UL;
memory_mapping->gpio_right.mmap_length = 0x400000UL;
memory_mapping->gpio_right.mmap_virt_base = mmap(
0,
memory_mapping->gpio_right.mmap_length,
PROT_READ|PROT_WRITE,
MAP_SHARED, fd,
memory_mapping->gpio_right.mmap_phys_base);
if (memory_mapping->gpio_right.mmap_virt_base == MAP_FAILED) {
rc = errno;
printf("%s: mmap on %s failed with error %d: %s\n",
__func__, devmem, rc, strerror(rc));
return -1;
}
memory_mapping->gpio_left.mmap_phys_base = 0x11400000UL;
memory_mapping->gpio_left.mmap_length = 0x400000UL;
memory_mapping->gpio_left.mmap_virt_base = mmap(
0,
memory_mapping->gpio_left.mmap_length,
PROT_READ|PROT_WRITE,
MAP_SHARED, fd,
memory_mapping->gpio_left.mmap_phys_base);
if (memory_mapping->gpio_left.mmap_virt_base == MAP_FAILED) {
rc = errno;
printf("%s: mmap on %s failed with error %d: %s\n",
__func__, devmem, rc, strerror(rc));
return -1;
}
rc = close(fd);
if (rc == -1) {
rc = errno;
printf("Closing %s failed with error %d: %s\n",
devmem, rc, strerror(rc));
return -1;
}
*memory_mapping_pp = memory_mapping;
if (debug) {
printf("%s: %s(%p) mapped at %p. Length: %p\n",
__func__,
"gpio_right",
(void*)memory_mapping->gpio_right.mmap_phys_base,
(void*)memory_mapping->gpio_right.mmap_virt_base,
(void*)memory_mapping->gpio_right.mmap_length);
printf("%s: %s(%p) mapped at %p. Length: %p\n",
__func__,
"gpio_left",
(void*)memory_mapping->gpio_left.mmap_phys_base,
(void*)memory_mapping->gpio_left.mmap_virt_base,
(void*)memory_mapping->gpio_left.mmap_length);
}
return 0;
}
int exit_memory_mapping(int debug, struct memory_mapping *memory_mapping)
{
int rc;
rc = munmap(memory_mapping->gpio_right.mmap_virt_base,
memory_mapping->gpio_right.mmap_length);
if (rc == -1) {
rc = errno;
printf("%s: munmap of %s failed with error %d: %s\n",
__func__, "gpio_right", rc, strerror(rc));
return -1;
}
rc = munmap(memory_mapping->gpio_left.mmap_virt_base,
memory_mapping->gpio_left.mmap_length);
if (rc == -1) {
rc = errno;
printf("%s: munmap of %s failed with error %d: %s\n",
__func__, "gpio_left", rc, strerror(rc));
return -1;
}
free(memory_mapping);
return 0;
}
off_t *phys_to_virt(int debug, struct memory_mapping *memory_mapping, off_t phys_addr)
{
off_t offset = 0;
if (addr_is_gpioleft(memory_mapping, phys_addr)) {
/* we mmap with mmap_phys_base as offset, and the resulting
* virtual address points directly at mmap_phys_base
*/
offset = phys_addr - memory_mapping->gpio_left.mmap_phys_base;
if (debug)
printf("%s: addrress %p is valid. Offset: %p\n",
__func__, (void*)phys_addr, (void*)offset);
return memory_mapping->gpio_left.mmap_virt_base + offset;
} else if (addr_is_gpioright(memory_mapping, phys_addr)) {
/* we mmap with mmap_phys_base as offset, and the resulting
* virtual address points directly at mmap_phys_base
*/
offset = phys_addr - memory_mapping->gpio_right.mmap_phys_base;
if (debug)
printf("%s: addrress %p is valid. Offset: %p\n",
__func__, (void*)phys_addr, (void*)offset);
return memory_mapping->gpio_right.mmap_virt_base + offset;
} else {
printf("%s: failed: invalid address %p\n",
__func__, (void*)phys_addr);
errno = EDOM;
return 0;
}
}
int read_word(int debug, struct memory_mapping *memory_mapping,
off_t addr, unsigned long *result)
{
off_t *virt_addr;
virt_addr = phys_to_virt(debug, memory_mapping, addr);
if (virt_addr == NULL)
return -1;
*result = *virt_addr;
if (debug)
printf("%s: addr=0x%llx, result=0x%lx\n",
__func__, (long long int)addr, *result);
return 0;
}
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