blob: 93a35321ef7b6003c55835358dc1ff2aeb00e1ac [file] [log] [blame]
/*
* pcimem.c: Simple program to read/write from/to a pci device from userspace.
*
* Copyright (C) 2010, Bill Farrow (bfarrow@beyondelectronics.us)
*
* Based on the devmem2.c code
* Copyright (C) 2000, Jan-Derk Bakker (J.D.Bakker@its.tudelft.nl)
*
* 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 2 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, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <signal.h>
#include <fcntl.h>
#include <ctype.h>
#include <termios.h>
#include <sys/types.h>
#include <sys/mman.h>
#define PRINT_ERROR \
do { \
fprintf(stderr, "Error at line %d, file %s (%d) [%s]\n", \
__LINE__, __FILE__, errno, strerror(errno)); exit(1); \
} while(0)
#define MAP_SIZE 4096UL
#define MAP_MASK (MAP_SIZE - 1)
void dump_page(uint32_t *vaddr, uint32_t *vbase, uint32_t *pbase){
int i =0;
uint32_t *end = vaddr + (MAP_SIZE >> 6);
uint32_t *start = vaddr;
while(start < end) {
printf("%p:%08x %08x %08x %08x\n",
start - vbase + pbase, start[0], start[1] , start[2], start[3]);
start+=4;
}
}
void reg_mod_bits(uint32_t *virt_addr, int data, int start_bit, int data_len)
{
int mask=0;
int value;
int i;
for (i = 0; i < data_len; i++) {
mask |= 1 << (start_bit + i);
}
value = *((volatile uint32_t *) virt_addr);
value &= ~mask;
value |= (data << start_bit) & mask;;
*((uint32_t *) virt_addr) = value;
}
void usage(void)
{
fprintf(stderr, "\nUsage:\tregs [Type] [ Offset:Hex ] [ Data:Hex ] [StartBit:Dec] [DataLen:Dec]\n"
"\tType : access operation type : [m]odify, [w]wite, [d]ump\n"
"\tOffset : offset into memory region to act upon\n"
"\tData : data to be written\n"
"\tStartbit: Startbit of Addr that want to be modified\n"
"\tDataLen : Data length of Data\n\n"
"Example:\tRead/Write/Modify register \n"
"\tRead : regs d 0x1b100000 //dump 0x1b100000~0x1b1000f0 \n"
"\tWrite : regs w 0x1b100000 0x1234 //write 0x1b100000=0x1234\n"
"\tModify : regs m 0x1b100000 0x0 29 3 //modify 0x1b100000[29:31]=0\n");
}
int main(int argc, char **argv) {
int fd;
void *map_base = NULL;
void *virt_addr = NULL;
uint32_t read_result =0;
uint32_t writeval = 0;
uint32_t startbit = 0;
uint32_t datalen = 0;
char *filename = NULL;
off_t offset = 0;
int access_type = 0;
if(argc < 2) {
usage();
exit(1);
}
access_type = tolower(argv[1][0]);
if((access_type == 'd' && argc < 3) || (access_type == 'w' && argc < 4) || (access_type == 'm' && argc < 6)) {
usage();
exit(1);
}
filename = "/dev/mem";
if((fd = open(filename, O_RDWR | O_SYNC)) == -1)
PRINT_ERROR;
/* Map one page */
offset = strtoul(argv[2], NULL, 16);
map_base = mmap(0, 2*MAP_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED, fd, offset & ~MAP_MASK);
if(map_base == (void *) -1)
PRINT_ERROR;
virt_addr = map_base + (offset & MAP_MASK);
read_result = *((volatile uint32_t *) virt_addr);
printf("Value at 0x%X (%p): 0x%X\n", offset, virt_addr, read_result);
switch(access_type) {
case 'm':
writeval = strtoul(argv[3], 0, 16);
startbit = strtoul(argv[4], 0, 10);
datalen = strtoul(argv[5], 0, 10);
reg_mod_bits((uint32_t *)virt_addr, writeval, startbit, datalen);
break;
case 'w':
writeval = strtoul(argv[3], 0, 16);
*((uint32_t *) virt_addr) = writeval;
break;
case 'd':
dump_page(virt_addr, map_base, (uint32_t *)(offset & ~MAP_MASK));
return;
default:
fprintf(stderr, "Illegal data type '%c'.\n", access_type);
exit(2);
}
read_result = *((volatile uint32_t *) virt_addr);
printf("Written 0x%X; Readback 0x%X\n", writeval, read_result);
if(munmap(map_base, MAP_SIZE) == -1)
PRINT_ERROR;
close(fd);
return 0;
}