149 lines
3.6 KiB
C
149 lines
3.6 KiB
C
/*
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* (C) Copyright 2015
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* Alexander Couzens, lynxis@fe80.eu
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (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., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <command.h>
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#ifdef CFG_CMD_BOOTCYCLE
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#ifndef MAX_REBOOTS
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#define MAX_REBOOTS 10
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#endif
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#define SRAM_BOOT_CYCLE 0xbd000100
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#define BOOT_CYCLE_MAGIC 0xfeedb00d
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#define BOOT_CYCLE_VERSION 1
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struct sram_boot_cycle
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{
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uint32_t magic;
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uint32_t version;
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uint32_t counter;
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uint32_t crc;
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};
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static int valid_boot_cycle(struct sram_boot_cycle *sram)
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{
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if (sram->magic != BOOT_CYCLE_MAGIC)
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return 0;
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if (sram->version != BOOT_CYCLE_VERSION)
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return 0;
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uint32_t crc = crc32(0xdeadbeef, (void *)sram, sizeof(*sram) - 4);
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if (crc != sram->crc)
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return 0;
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return 1;
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}
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static void reset_boot_cycle(struct sram_boot_cycle *sram)
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{
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sram->magic = BOOT_CYCLE_MAGIC;
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sram->version = BOOT_CYCLE_VERSION;
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sram->counter = 0;
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sram->crc = (uint32_t) crc32(0xdeadbeef, (void *)sram, sizeof(*sram) - 4);
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}
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void increase_boot_cycle(struct sram_boot_cycle *sram, uint32_t value)
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{
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if (!valid_boot_cycle(sram))
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reset_boot_cycle(sram);
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sram->counter += value;
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sram->crc = (uint32_t) crc32(0xdeadbeef, (void *)sram, sizeof(*sram) - 4);
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}
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int do_inccycle(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]) {
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uint32_t value = 1;
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if (argc == 2) {
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int given_value = (int)simple_strtol(argv[1], NULL, 10);
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if (given_value > 0) {
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value = given_value;
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} else {
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printf("Ignoring invalid argument %s\n", argv[1]);
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}
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}
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increase_boot_cycle((void *) SRAM_BOOT_CYCLE, value);
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return CMD_RET_SUCCESS;
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}
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int do_resetcycle(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]) {
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reset_boot_cycle((void *) SRAM_BOOT_CYCLE);
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return CMD_RET_SUCCESS;
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}
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/* report failure when we need to go to rescue */
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int do_checkcycle(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
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{
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uint32_t threshold = MAX_REBOOTS;
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if (argc == 2) {
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int given_threshold = (int)simple_strtol(argv[1], NULL, 10);
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if (given_threshold > 0) {
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threshold = given_threshold;
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} else {
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printf("Ignoring invalid argument %s\n", argv[1]);
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}
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}
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struct sram_boot_cycle *sram = (void *) SRAM_BOOT_CYCLE;
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/* when called we should ever have a valid boot cycle entry
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* if it's invalid we have most likely a broken bootloader or hw? */
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if (!valid_boot_cycle(sram)) {
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printf("Invalid boot cycle partition!\n");
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return CMD_RET_FAILURE;
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}
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printf("bootcycle counter: %d\n", sram->counter);
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if (sram->counter >= threshold) {
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printf("Reached maximum reboot.\n");
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return CMD_RET_FAILURE;
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}
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return CMD_RET_SUCCESS;
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}
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U_BOOT_CMD(
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checkcycle, 2, 0, do_checkcycle,
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"checkcycle - check if maximum reboots reached.\n",
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"[max_reboots]"
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);
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U_BOOT_CMD(
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inccycle, 2, 0, do_inccycle,
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"inccycle - increase boot cycle counter\n",
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NULL
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);
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U_BOOT_CMD(
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resetcycle, 1, 0, do_resetcycle,
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"resetcycle - reset boot cycle counter to 0\n",
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NULL
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);
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#endif /* CFG_CMD_BOOTCYCLE */
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