518 lines
11 KiB
C
518 lines
11 KiB
C
/* MSPDebug - debugging tool for the eZ430
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* Copyright (C) 2009-2014 Daniel Beer
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdint.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include "rom_bsl.h"
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#include "util.h"
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#include "output.h"
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#include "bsllib.h"
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#include "util/sport.h"
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struct rom_bsl_device {
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struct device base;
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sport_t fd;
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const char *seq;
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uint8_t reply_buf[256];
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int reply_len;
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};
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#define DATA_HDR 0x80
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#define DATA_ACK 0x90
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#define DATA_NAK 0xA0
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static int rom_bsl_ack(struct rom_bsl_device *dev)
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{
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uint8_t reply;
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if (sport_read_all(dev->fd, &reply, 1) < 0) {
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pr_error("rom_bsl: failed to receive reply");
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return -1;
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}
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if (reply == DATA_NAK) {
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printc_err("rom_bsl: received NAK\n");
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return -1;
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}
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if (reply != DATA_ACK) {
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printc_err("rom_bsl: bad ack character: %x\n", reply);
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return -1;
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}
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return 0;
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}
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static int rom_bsl_sync(struct rom_bsl_device *dev)
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{
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static const uint8_t c = DATA_HDR;
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int tries = 2;
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if (sport_flush(dev->fd) < 0) {
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pr_error("rom_bsl: tcflush");
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return -1;
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}
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while (tries--) {
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if (sport_write_all(dev->fd, &c, 1) < 0) {
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pr_error("rom_bsl: write error");
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continue;
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}
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if (!rom_bsl_ack(dev))
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return 0;
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}
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printc_err("rom_bsl: sync failed\n");
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return -1;
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}
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static int send_command(struct rom_bsl_device *dev,
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int code, uint16_t addr,
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const uint8_t *data, int len)
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{
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uint8_t pktbuf[256];
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uint8_t cklow = 0xff;
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uint8_t ckhigh = 0xff;
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int pktlen;
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int evenlen = len;
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int i;
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if (len % 2 != 0) {
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printc_dbg("Making length even\n");
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evenlen = len + 1;
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}
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pktlen = data ? evenlen + 4 : 4;
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if (pktlen + 6 > sizeof(pktbuf)) {
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printc_err("rom_bsl: payload too large: %d\n", len);
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return -1;
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}
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pktbuf[0] = DATA_HDR;
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pktbuf[1] = code;
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pktbuf[2] = pktlen;
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pktbuf[3] = pktlen;
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pktbuf[4] = addr & 0xff;
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pktbuf[5] = addr >> 8;
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pktbuf[6] = evenlen & 0xff;
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pktbuf[7] = evenlen >> 8;
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if (data) {
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memcpy(pktbuf + 8, data, len);
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if (len != evenlen)
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pktbuf[8 + len] = 0xff;
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}
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for (i = 0; i < pktlen + 4; i += 2)
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cklow ^= pktbuf[i];
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for (i = 1; i < pktlen + 4; i += 2)
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ckhigh ^= pktbuf[i];
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pktbuf[pktlen + 4] = cklow;
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pktbuf[pktlen + 5] = ckhigh;
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#ifdef DEBUG_ROM_BSL
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debug_hexdump("Send", pktbuf, pktlen + 6);
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#endif
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if (sport_write_all(dev->fd, pktbuf, pktlen + 6) < 0) {
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pr_error("rom_bsl: write error");
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return -1;
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}
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return 0;
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}
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static int verify_checksum(struct rom_bsl_device *dev)
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{
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uint8_t cklow = 0xff;
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uint8_t ckhigh = 0xff;
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int i;
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for (i = 0; i < dev->reply_len; i += 2)
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cklow ^= dev->reply_buf[i];
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for (i = 1; i < dev->reply_len; i += 2)
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ckhigh ^= dev->reply_buf[i];
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if (cklow || ckhigh) {
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printc_err("rom_bsl: checksum invalid (%02x %02x)\n",
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cklow, ckhigh);
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return -1;
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}
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return 0;
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}
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static int fetch_reply(struct rom_bsl_device *dev)
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{
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dev->reply_len = 0;
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for (;;) {
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int r = sport_read(dev->fd,
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dev->reply_buf + dev->reply_len,
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sizeof(dev->reply_buf) - dev->reply_len);
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if (!r) {
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printc_err("rom_bsl: read timeout\n");
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return -1;
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}
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if (r < 0) {
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pr_error("rom_bsl: read error");
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return -1;
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}
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#ifdef DEBUG_ROM_BSL
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debug_hexdump("Receive", dev->reply_buf + dev->reply_len, r);
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#endif
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dev->reply_len += r;
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if (dev->reply_buf[0] == DATA_ACK) {
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return 0;
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} else if (dev->reply_buf[0] == DATA_HDR) {
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if (dev->reply_len >= 6 &&
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dev->reply_len == dev->reply_buf[2] + 6)
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return verify_checksum(dev);
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} else if (dev->reply_buf[0] == DATA_NAK) {
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printc_err("rom_bsl: received NAK\n");
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return -1;
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} else {
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printc_err("rom_bsl: unknown reply type: %02x\n",
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dev->reply_buf[0]);
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return -1;
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}
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if (dev->reply_len >= sizeof(dev->reply_buf)) {
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printc_err("rom_bsl: reply buffer overflow\n");
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return -1;
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}
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}
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}
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static int rom_bsl_xfer(struct rom_bsl_device *dev,
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int command_code, uint16_t addr, const uint8_t *txdata,
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int len)
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{
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if (rom_bsl_sync(dev) < 0 ||
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send_command(dev, command_code, addr, txdata, len) < 0 ||
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fetch_reply(dev) < 0) {
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printc_err("rom_bsl: failed on command 0x%02x "
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"(addr = 0x%04x, len = 0x%04x)\n",
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command_code, addr, len);
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return -1;
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}
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return 0;
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}
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#define CMD_MASS_ERASE 0x18
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#define CMD_ERASE_SEGMENT 0x16
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#define CMD_TX_DATA 0x14
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#define CMD_RX_DATA 0x12
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#define CMD_TX_VERSION 0x1e
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#define CMD_RX_PASSWORD 0x10
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static void rom_bsl_destroy(device_t dev_base)
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{
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struct rom_bsl_device *dev = (struct rom_bsl_device *)dev_base;
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if (bsllib_seq_do(dev->fd, bsllib_seq_next(dev->seq)) < 0)
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pr_error("warning: rom_bsl: exit sequence failed");
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sport_close(dev->fd);
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free(dev);
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}
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static int rom_bsl_ctl(device_t dev_base, device_ctl_t type)
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{
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(void)dev_base;
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switch (type) {
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case DEVICE_CTL_HALT:
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/* Ignore halt requests */
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return 0;
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case DEVICE_CTL_RESET:
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/* Ignore reset requests */
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return 0;
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default:
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printc_err("rom_bsl: CPU control is not possible\n");
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}
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return -1;
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}
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static device_status_t rom_bsl_poll(device_t dev_base)
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{
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(void)dev_base;
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return DEVICE_STATUS_HALTED;
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}
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static int rom_bsl_getregs(device_t dev_base, address_t *regs)
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{
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(void)dev_base;
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(void)regs;
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printc_err("rom_bsl: register fetch is not implemented\n");
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return -1;
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}
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static int rom_bsl_setregs(device_t dev_base, const address_t *regs)
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{
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(void)dev_base;
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(void)regs;
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printc_err("rom_bsl: register store is not implemented\n");
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return -1;
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}
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static int rom_bsl_writemem(device_t dev_base,
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address_t addr, const uint8_t *mem, address_t len)
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{
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struct rom_bsl_device *dev = (struct rom_bsl_device *)dev_base;
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if (addr >= 0x10000 || len > 0x10000 || addr + len > 0x10000) {
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printc_err("rom_bsl: memory write out of range\n");
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return -1;
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}
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while (len) {
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int wlen = len > 100 ? 100 : len;
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int r;
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uint8_t memtmp[256];
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const uint8_t *memptr;
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if (addr % 2) {
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printc_dbg("Memory aligning\n");
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memcpy(memtmp + 1, mem, wlen);
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memtmp[0] = 0xff;
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memptr = memtmp;
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wlen++;
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len++;
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addr--;
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mem--;
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}
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else {
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memptr = mem;
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}
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r = rom_bsl_xfer(dev, CMD_RX_DATA, addr, memptr, wlen);
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if (r < 0) {
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printc_err("rom_bsl: failed to write to 0x%04x\n",
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addr);
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return -1;
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}
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mem += wlen;
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len -= wlen;
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addr += wlen;
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}
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return 0;
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}
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static int rom_bsl_readmem(device_t dev_base,
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address_t addr, uint8_t *mem, address_t len)
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{
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struct rom_bsl_device *dev = (struct rom_bsl_device *)dev_base;
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if (addr >= 0x10000 || len > 0x10000 || addr + len > 0x10000) {
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printc_err("rom_bsl: memory read out of range\n");
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return -1;
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}
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while (len) {
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address_t count = len;
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int align = 0;
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if (addr % 2 != 0) {
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printc_dbg("Memory aligning\n");
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count++;
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addr--;
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align = 1;
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}
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if (count > 220)
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count = 220;
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if (rom_bsl_xfer(dev, CMD_TX_DATA, addr, NULL, count) < 0) {
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printc_err("rom_bsl: failed to read memory\n");
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return -1;
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}
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if (count > dev->reply_buf[2])
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count = dev->reply_buf[2];
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memcpy(mem, dev->reply_buf + 4 + align, count - align);
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mem += (count - align);
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len -= (count - align);
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addr += (count - align);
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}
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return 0;
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}
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static int rom_bsl_erase(device_t dev_base, device_erase_type_t type,
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address_t addr)
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{
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struct rom_bsl_device *dev = (struct rom_bsl_device *)dev_base;
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(void)addr;
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switch (type) {
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case DEVICE_ERASE_MAIN:
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return rom_bsl_xfer(dev, CMD_ERASE_SEGMENT,
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0xfffe, NULL, 0xa504);
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case DEVICE_ERASE_SEGMENT:
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return rom_bsl_xfer(dev, CMD_ERASE_SEGMENT,
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addr, NULL, 0xa502);
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case DEVICE_ERASE_ALL:
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return rom_bsl_xfer(dev, CMD_MASS_ERASE,
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0xfffe, NULL, 0xa506);
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}
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return 0;
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}
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static int unlock_device(struct rom_bsl_device *dev)
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{
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const static uint8_t password[32] = {
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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};
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printc_dbg("Performing mass erase...\n");
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if (rom_bsl_xfer(dev, CMD_MASS_ERASE, 0xfffe, NULL, 0xa506) < 0) {
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printc_err("rom_bsl: initial mass erase failed\n");
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return -1;
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}
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printc_dbg("Sending password...\n");
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if (rom_bsl_xfer(dev, CMD_RX_PASSWORD, 0,
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password, sizeof(password)) < 0) {
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printc_err("rom_bsl: RX password failed\n");
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return -1;
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}
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return 0;
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}
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static device_t rom_bsl_open(const struct device_args *args)
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{
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struct rom_bsl_device *dev;
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if (!(args->flags & DEVICE_FLAG_TTY)) {
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printc_err("rom_bsl: raw USB access is not supported");
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return NULL;
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}
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dev = malloc(sizeof(*dev));
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if (!dev) {
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pr_error("rom_bsl: can't allocate memory");
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return NULL;
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}
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memset(dev, 0, sizeof(*dev));
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dev->base.type = &device_rom_bsl;
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dev->fd = sport_open(args->path, 9600, SPORT_EVEN_PARITY);
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if (SPORT_ISERR(dev->fd)) {
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pr_error("sport_open");
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free(dev);
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return NULL;
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}
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dev->seq = args->bsl_entry_seq;
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if (!dev->seq)
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dev->seq = "DR,r,R,r,d,R:DR,r";
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if ( args->bsl_gpio_used )
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{
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if (bsllib_seq_do_gpio(args->bsl_gpio_rts, args->bsl_gpio_dtr, dev->seq) < 0) {
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pr_error("rom_bsl: entry sequence failed");
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goto fail;
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}
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}
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else
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{
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if (bsllib_seq_do(dev->fd, dev->seq) < 0) {
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pr_error("rom_bsl: entry sequence failed");
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goto fail;
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}
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}
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delay_ms(500);
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/* Show BSL version */
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if (rom_bsl_xfer(dev, CMD_TX_VERSION, 0, NULL, 0) < 0)
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printc_err("warning: rom_bsl: failed to read version\n");
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else if (dev->reply_len < 19)
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printc_err("warning: rom_bsl: short reply\n");
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else
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printc_dbg("BSL version is %x.%02x\n",
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dev->reply_buf[15],
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dev->reply_buf[16]);
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if (unlock_device(dev) < 0) {
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printc_err("rom_bsl: failed to unlock\n");
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goto fail;
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}
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return (device_t)dev;
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fail:
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sport_close(dev->fd);
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free(dev);
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return NULL;
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}
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const struct device_class device_rom_bsl = {
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.name = "rom-bsl",
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.help = "ROM bootstrap loader",
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.open = rom_bsl_open,
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.destroy = rom_bsl_destroy,
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.readmem = rom_bsl_readmem,
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.writemem = rom_bsl_writemem,
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.erase = rom_bsl_erase,
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.getregs = rom_bsl_getregs,
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.setregs = rom_bsl_setregs,
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.ctl = rom_bsl_ctl,
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.poll = rom_bsl_poll,
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.getconfigfuses = NULL
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};
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