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twiboot/linux/twi.c

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/***************************************************************************
* Copyright (C) 10/2010 by Olaf Rempel *
* razzor@kopf-tisch.de *
* *
* 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; version 2 of the License, *
* *
* 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 <unistd.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <dirent.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <linux/i2c.h>
#include <linux/i2c-dev.h>
#include "chipinfo_avr.h"
#include "filedata.h"
#include "list.h"
#include "multiboot.h"
#include "optarg.h"
#define MIN(a, b) ((a) < (b) ? (a) : (b))
#define ARRAY_SIZE(x) (sizeof(x) / sizeof(*x))
#define TWI_DEFAULT_DEVICE "/dev/i2c-0"
#define READ_BLOCK_SIZE 128 /* bytes in one flash/eeprom read request */
#define WRITE_BLOCK_SIZE 16 /* bytes in one eeprom write request */
/* SLA+R */
#define CMD_WAIT 0x00
#define CMD_READ_VERSION 0x01
#define CMD_READ_MEMORY 0x02
/* SLA+W */
#define CMD_SWITCH_APPLICATION CMD_READ_VERSION
#define CMD_WRITE_MEMORY CMD_READ_MEMORY
/* CMD_SWITCH_APPLICATION parameter */
#define BOOTTYPE_BOOTLOADER 0x00 /* only in APP */
#define BOOTTYPE_APPLICATION 0x80
/* CMD_{READ|WRITE}_* parameter */
#define MEMTYPE_CHIPINFO 0x00
#define MEMTYPE_FLASH 0x01
#define MEMTYPE_EEPROM 0x02
#define MEMTYPE_PARAMETERS 0x03 /* only in APP */
struct multiboot_ops twi_ops;
struct twi_privdata {
char *device;
uint8_t address;
int fd;
int connected;
uint8_t pagesize;
uint16_t flashsize;
uint16_t eepromsize;
};
static struct option twi_optargs[] = {
{"address", 1, 0, 'a'}, /* -a <addr> */
{"device", 1, 0, 'd'}, /* [ -d <device> ] */
};
static int twi_switch_application(struct twi_privdata *twi, uint8_t application)
{
uint8_t cmd[] = { CMD_SWITCH_APPLICATION, application };
return (write(twi->fd, cmd, sizeof(cmd)) != sizeof(cmd));
}
static int twi_read_version(struct twi_privdata *twi, char *version, int length)
{
uint8_t cmd[] = { CMD_READ_VERSION };
if (write(twi->fd, cmd, sizeof(cmd)) != sizeof(cmd))
return -1;
memset(version, 0, length);
if (read(twi->fd, version, length) != length)
return -1;
int i;
for (i = 0; i < length; i++)
version[i] &= ~0x80;
return 0;
}
static int twi_read_memory(struct twi_privdata *twi, uint8_t *buffer, uint8_t size, uint8_t memtype, uint16_t address)
{
uint8_t cmd[] = { CMD_READ_MEMORY, memtype, (address >> 8) & 0xFF, (address & 0xFF) };
if (write(twi->fd, cmd, sizeof(cmd)) != sizeof(cmd))
return -1;
return (read(twi->fd, buffer, size) != size);
}
static int twi_write_memory(struct twi_privdata *twi, uint8_t *buffer, uint8_t size, uint8_t memtype, uint16_t address)
{
int bufsize;
if (memtype == MEMTYPE_FLASH) {
if ((address & (twi->pagesize -1)) != 0x00) {
fprintf(stderr, "twi_write_memory(): address 0x%04x not aligned to pagesize 0x%02x\n", address, twi->pagesize);
return -1;
}
bufsize = 4 + twi->pagesize;
} else {
bufsize = 4 + size;
}
uint8_t *cmd = malloc(bufsize);
if (cmd == NULL)
return -1;
cmd[0] = CMD_WRITE_MEMORY;
cmd[1] = memtype;
cmd[2] = (address >> 8) & 0xFF;
cmd[3] = (address & 0xFF);
memcpy(cmd +4, buffer, size);
if (memtype == MEMTYPE_FLASH) {
memset(cmd +4 +size, 0xFF, twi->pagesize - size);
}
int result = write(twi->fd, cmd, bufsize);
free(cmd);
return (result != bufsize);
}
static void twi_close_device(struct twi_privdata *twi)
{
if (twi->connected)
close(twi->fd);
twi->connected = 0;
}
static int twi_open_device(struct twi_privdata *twi)
{
twi->fd = open(twi->device, O_RDWR);
if (twi->fd < 0) {
fprintf(stderr, "failed to open '%s': %s\n", twi->device, strerror(errno));
return -1;
}
unsigned long funcs;
if (ioctl(twi->fd, I2C_FUNCS, &funcs)) {
perror("ioctl(I2C_FUNCS)");
close(twi->fd);
return -1;
}
if (!(funcs & I2C_FUNC_I2C)) {
fprintf(stderr, "I2C_FUNC_I2C not supported on '%s'!\n", twi->device);
close(twi->fd);
return -1;
}
if (ioctl(twi->fd, I2C_SLAVE, twi->address) < 0) {
fprintf(stderr, "failed to select slave address '%d': %s\n", twi->address, strerror(errno));
close(twi->fd);
return -1;
}
twi->connected = 1;
return 0;
}
static int twi_close(struct multiboot *mboot)
{
struct twi_privdata *twi = (struct twi_privdata *)mboot->privdata;
if (twi->connected)
twi_switch_application(twi, BOOTTYPE_APPLICATION);
twi_close_device(twi);
return 0;
}
static int twi_open(struct multiboot *mboot)
{
struct twi_privdata *twi = (struct twi_privdata *)mboot->privdata;
if (twi->address == 0) {
fprintf(stderr, "abort: no address given\n");
return -1;
}
if (twi->device == NULL) {
twi->device = strdup(TWI_DEFAULT_DEVICE);
if (twi->device == NULL) {
perror("strdup()");
return -1;
}
}
if (twi_open_device(twi) != 0)
return -1;
if (twi_switch_application(twi, BOOTTYPE_BOOTLOADER)) {
fprintf(stderr, "failed to switch to bootloader (invalid address?): %s\n", strerror(errno));
twi_close(mboot);
return -1;
}
/* wait for watchdog and startup time */
usleep(100000);
char version[16];
if (twi_read_version(twi, version, sizeof(version))) {
fprintf(stderr, "failed to get bootloader version: %s\n", strerror(errno));
twi_close(mboot);
return -1;
}
uint8_t chipinfo[8];
if (twi_read_memory(twi, chipinfo, sizeof(chipinfo), MEMTYPE_CHIPINFO, 0x0000)) {
fprintf(stderr, "failed to get chipinfo: %s\n", strerror(errno));
twi_close(mboot);
return -1;
}
const char *chipname = chipinfo_get_avr_name(chipinfo);
twi->pagesize = chipinfo[3];
twi->flashsize = (chipinfo[4] << 8) + chipinfo[5];
twi->eepromsize = (chipinfo[6] << 8) + chipinfo[7];
printf("device : %-16s (address: 0x%02X)\n", twi->device, twi->address);
printf("version : %-16s (sig: 0x%02x 0x%02x 0x%02x => %s)\n", version, chipinfo[0], chipinfo[1], chipinfo[2], chipname);
printf("flash size : 0x%04x / %5d (0x%02x bytes/page)\n", twi->flashsize, twi->flashsize, twi->pagesize);
printf("eeprom size : 0x%04x / %5d\n", twi->eepromsize, twi->eepromsize);
return 0;
}
static int twi_read(struct multiboot *mboot, struct databuf *dbuf, int memtype)
{
struct twi_privdata *twi = (struct twi_privdata *)mboot->privdata;
char *progress_msg = (memtype == MEMTYPE_FLASH) ? "reading flash" : "reading eeprom";
int pos = 0;
int size = (memtype == MEMTYPE_FLASH) ? twi->flashsize : twi->eepromsize;
while (pos < size) {
mboot->progress_cb(progress_msg, pos, size);
int len = MIN(READ_BLOCK_SIZE, size - pos);
if (twi_read_memory(twi, dbuf->data + pos, len, memtype, pos)) {
mboot->progress_cb(progress_msg, -1, -1);
return -1;
}
pos += len;
}
dbuf->length = pos;
mboot->progress_cb(progress_msg, pos, size);
return 0;
}
static int twi_write(struct multiboot *mboot, struct databuf *dbuf, int memtype)
{
struct twi_privdata *twi = (struct twi_privdata *)mboot->privdata;
char *progress_msg = (memtype == MEMTYPE_FLASH) ? "writing flash" : "writing eeprom";
int pos = 0;
while (pos < dbuf->length) {
mboot->progress_cb(progress_msg, pos, dbuf->length);
int len = (memtype == MEMTYPE_FLASH) ? twi->pagesize : WRITE_BLOCK_SIZE;
len = MIN(len, dbuf->length - pos);
if (twi_write_memory(twi, dbuf->data + pos, len, memtype, pos)) {
mboot->progress_cb(progress_msg, -1, -1);
return -1;
}
pos += len;
}
mboot->progress_cb(progress_msg, pos, dbuf->length);
return 0;
}
static int twi_verify(struct multiboot *mboot, struct databuf *dbuf, int memtype)
{
struct twi_privdata *twi = (struct twi_privdata *)mboot->privdata;
char *progress_msg = (memtype == MEMTYPE_FLASH) ? "verifing flash" : "verifing eeprom";
int pos = 0;
uint8_t comp[READ_BLOCK_SIZE];
while (pos < dbuf->length) {
mboot->progress_cb(progress_msg, pos, dbuf->length);
int len = MIN(READ_BLOCK_SIZE, dbuf->length - pos);
if (twi_read_memory(twi, comp, len, memtype, pos)) {
mboot->progress_cb(progress_msg, -1, -1);
return -1;
}
if (memcmp(comp, dbuf->data + pos, len) != 0x00) {
mboot->progress_cb(progress_msg, -1, -1);
fprintf(stderr, "verify failed at page 0x%04x!!\n", pos);
return -1;
}
pos += len;
}
dbuf->length = pos;
mboot->progress_cb(progress_msg, pos, dbuf->length);
return 0;
}
static int twi_optarg_cb(int val, const char *arg, void *privdata)
{
struct twi_privdata *twi = (struct twi_privdata *)privdata;
switch (val) {
case 'a': /* address */
{
char *endptr;
twi->address = strtol(arg, &endptr, 16);
if (*endptr != '\0' || twi->address < 0x01 || twi->address > 0x7F) {
fprintf(stderr, "invalid address: '%s'\n", arg);
return -1;
}
}
break;
case 'd': /* device */
{
if (twi->device != NULL) {
fprintf(stderr, "invalid device: '%s'\n", optarg);
return -1;
}
twi->device = strdup(optarg);
if (twi->device == NULL) {
perror("strdup()");
return -1;
}
}
break;
case 'h':
case '?': /* error */
fprintf(stderr, "Usage: twiboot [options]\n"
" -a <address> - selects i2c address (0x01 - 0x7F)\n"
" -d <device> - selects i2c device (default: /dev/i2c-0)\n"
" -r <flash|eeprom>:<file> - reads flash/eeprom to file (.bin | .hex | -)\n"
" -w <flash|eeprom>:<file> - write flash/eeprom from file (.bin | .hex)\n"
" -n - disable verify after write\n"
" -p <0|1|2> - progress bar mode\n"
"\n"
"Example: twiboot -a 0x22 -w flash:blmc.hex -w flash:blmc_eeprom.hex\n"
"\n");
return -1;
default:
return 1;
}
return 0;
}
static struct multiboot * twi_alloc(void)
{
struct multiboot * mboot = malloc(sizeof(struct multiboot));
if (mboot == NULL)
return NULL;
memset(mboot, 0x00, sizeof(struct multiboot));
mboot->ops = &twi_ops;
struct twi_privdata *twi = malloc(sizeof(struct twi_privdata));
if (twi == NULL) {
free(mboot);
return NULL;
}
memset(twi, 0x00, sizeof(struct twi_privdata));
twi->device = NULL;
twi->address = 0;
optarg_register(twi_optargs, ARRAY_SIZE(twi_optargs), twi_optarg_cb, (void *)twi);
mboot->privdata = twi;
return mboot;
}
static void twi_free(struct multiboot *mboot)
{
struct twi_privdata *twi = (struct twi_privdata *)mboot->privdata;
if (twi->device != NULL)
free(twi->device);
free(twi);
free(mboot);
}
static int twi_get_memtype(struct multiboot *mboot, const char *memname)
{
if (strcmp(memname, "flash") == 0)
return MEMTYPE_FLASH;
else if (strcmp(memname, "eeprom") == 0)
return MEMTYPE_EEPROM;
return -1;
}
static int twi_get_memsize(struct multiboot *mboot, int memtype)
{
struct twi_privdata *twi = (struct twi_privdata *)mboot->privdata;
if (!twi->connected)
return 0;
switch (memtype) {
case MEMTYPE_FLASH:
return twi->flashsize;
case MEMTYPE_EEPROM:
return twi->eepromsize;
default:
return 0;
}
}
struct multiboot_ops twi_ops = {
.alloc = twi_alloc,
.free = twi_free,
.get_memtype = twi_get_memtype,
.get_memsize = twi_get_memsize,
.open = twi_open,
.close = twi_close,
.read = twi_read,
.write = twi_write,
.verify = twi_verify,
};
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