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/*
* devmem2.c: Simple program to read/write from/to any location in memory.
*
* Copyright (C) 2000 Jan-Derk Bakker (J.D.Bakker@its.tudelft.nl)
* Copyright (C) 2009 Carl-Daniel Hailfinger
* Copyright (C) 2016-2018 Raptor Engineering, LLC
*
*
* This software has been developed for the LART computing board
* (http://www.lart.tudelft.nl/). The development has been sponsored by
* the Mobile MultiMedia Communications (http://www.mmc.tudelft.nl/)
* and Ubiquitous Communications (http://www.ubicom.tudelft.nl/)
* projects.
*
* The author can be reached at:
*
* Jan-Derk Bakker
* Information and Communication Theory Group
* Faculty of Information Technology and Systems
* Delft University of Technology
* P.O. Box 5031
* 2600 GA Delft
* The Netherlands
*
*
* 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 <stdint.h>
#include <stdlib.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>
#include <pci/pci.h>
#define FATAL do { pci_cleanup(pacc);; fprintf(stderr, "Error at line %d, file %s (%d) [%s]\n", \
__LINE__, __FILE__, errno, strerror(errno)); exit(1); } while(0)
#define MAP_SIZE (128 * 1024)
#define MAP_MASK (MAP_SIZE - 1)
#define ASPEED_P2A_OFFSET 0x10000
struct pci_access *pacc;
uintptr_t aspeed_bar_offset = 0;
void *aspeed_control_bar = NULL;
void *aspeed_bar = NULL;
struct pci_dev *pci_dev_find(uint16_t vendor, uint16_t device)
{
struct pci_dev *temp;
struct pci_filter filter;
pci_filter_init(NULL, &filter);
filter.vendor = vendor;
filter.device = device;
for (temp = pacc->devices; temp; temp = temp->next)
if (pci_filter_match(&filter, temp))
return temp;
return NULL;
}
void sync_primitive(void)
{
#if defined(__PPC__) || defined(__PPC64__)
asm("eieio" : : : "memory");
#endif
}
static int ast2400_set_a2b_bridge_dest_address(uintptr_t address)
{
aspeed_bar_offset = address & 0xffff;
*((volatile uint32_t *)(aspeed_control_bar + 0xf000)) = 0x0;
sync_primitive();
*((volatile uint32_t *)(aspeed_control_bar + 0xf004)) = address & 0xffff0000;
sync_primitive();
*((volatile uint32_t *)(aspeed_control_bar + 0xf000)) = 0x1;
sync_primitive();
return 0;
}
static int ast2400_disable_a2b_bridge(void)
{
*((volatile uint32_t *)(aspeed_control_bar + 0xf000)) = 0x0;
sync_primitive();
return 0;
}
int main(int argc, char **argv) {
int fd;
void *bar_addr = NULL;
void *virt_addr;
uint32_t read_result, writeval;
uintptr_t target;
struct pci_dev* aspeed_dev = NULL;
int access_type = 'w';
if(argc < 2) {
fprintf(stderr, "\nUsage:\t%s { address } [ type [ data ] ]\n"
"\taddress : memory address to act upon\n"
"\ttype : access operation type : [b]yte, [h]alfword, [w]ord\n"
"\tdata : data to be written\n\n",
argv[0]);
exit(1);
}
target = strtoul(argv[1], 0, 0);
if(argc > 2) {
access_type = tolower(argv[2][0]);
}
pacc = pci_alloc();
pci_init(pacc);
pci_scan_bus(pacc);
aspeed_dev = pci_dev_find(0x1a03, 0x2000);
if (!aspeed_dev) FATAL;
bar_addr = (void *)(aspeed_dev->base_addr[1] & PCI_BASE_ADDRESS_MEM_MASK);
if((fd = open("/dev/mem", O_RDWR | O_SYNC)) == -1) FATAL;
/* Map control page */
aspeed_control_bar = mmap(0, MAP_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED, fd, (uintptr_t)bar_addr);
if(aspeed_control_bar == (void *) -1) FATAL;
bar_addr += ASPEED_P2A_OFFSET;
/* Map data page */
aspeed_bar = mmap(0, MAP_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED, fd, (uintptr_t)bar_addr);
if(aspeed_bar == (void *) -1) FATAL;
ast2400_set_a2b_bridge_dest_address(target);
virt_addr = aspeed_bar + (aspeed_bar_offset & MAP_MASK);
switch(access_type) {
case 'b':
read_result = *((volatile uint8_t *) virt_addr);
break;
case 'h':
read_result = *((volatile uint16_t *) virt_addr);
break;
case 'w':
read_result = *((volatile uint32_t *) virt_addr);
break;
default:
ast2400_disable_a2b_bridge();
fprintf(stderr, "Illegal data type '%c'.\n", access_type);
exit(2);
}
printf("0x%08X\n", read_result);
fflush(stdout);
if(argc > 3) {
writeval = strtoul(argv[3], 0, 0);
switch(access_type) {
case 'b':
*((volatile uint8_t *) virt_addr) = writeval;
sync_primitive();
read_result = *((volatile uint8_t *) virt_addr);
break;
case 'h':
*((volatile uint16_t *) virt_addr) = writeval;
sync_primitive();
read_result = *((volatile uint16_t *) virt_addr);
break;
case 'w':
*((volatile uint32_t *) virt_addr) = writeval;
sync_primitive();
read_result = *((volatile uint32_t *) virt_addr);
break;
}
}
ast2400_disable_a2b_bridge();
if(munmap(aspeed_bar, MAP_SIZE) == -1) FATAL;
if(munmap(aspeed_control_bar, MAP_SIZE) == -1) FATAL;
close(fd);
return 0;
}
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