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util/pmh7tool: Add tool to dump PMH7 registers 

Change-Id: I05ccb5a9a861fe44efec794aafe1805062543d53
Signed-off-by: Evgeny Zinoviev <me@ch1p.com>
Reviewed-on: https://review.coreboot.org/27776
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
This commit is contained in:
Evgeny Zinoviev 2018-08-01 15:53:18 +03:00 committed by Felix Held
parent 289e6ce252
commit d54f825ed1
3 changed files with 281 additions and 0 deletions
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38
util/pmh7tool/Makefile Normal file
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##
## Makefile for pmh7tool
##
## Copyright (C) 2018 Evgeny Zinoviev <me@ch1p.com>
##
## 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.
##
CC = gcc
CFLAGS = -O2 -Wall -W -Werror
PROGRAM = pmh7tool
INSTALL = /usr/bin/install
PREFIX = /usr/local
all: $(PROGRAM)
$(PROGRAM): pmh7tool.o
$(CC) $(CFLAGS) -o $@ $^ $(LDFLAGS)
install: $(PROGRAM)
$(INSTALL) $(PROGRAM) $(PREFIX)/sbin
clean:
rm -f *.o $(PROGRAM)
distclean: clean
%.o: %.c
$(CC) $(CFLAGS) -c $^ -I. -o $@
.PHONY: all install clean distclean

214
util/pmh7tool/pmh7tool.c Normal file
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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2018 Evgeny Zinoviev <me@ch1p.com>
*
* 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.
*/
#include <stdio.h>
#include <stdlib.h>
#include <getopt.h>
#include <sys/io.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <stdint.h>
#include "pmh7tool.h"
uint8_t pmh7_register_read(uint16_t reg)
{
outb(reg & 0xff, EC_LENOVO_PMH7_ADDR_L);
outb((reg & 0xff00) >> 8, EC_LENOVO_PMH7_ADDR_H);
return inb(EC_LENOVO_PMH7_DATA);
}
void pmh7_register_write(uint16_t reg, uint8_t val)
{
outb(reg & 0xff, EC_LENOVO_PMH7_ADDR_L);
outb((reg & 0xff00) >> 8, EC_LENOVO_PMH7_ADDR_H);
outb(val, EC_LENOVO_PMH7_DATA);
}
void pmh7_register_set_bit(uint16_t reg, uint8_t bit)
{
uint8_t val;
val = pmh7_register_read(reg);
pmh7_register_write(reg, val | (1 << bit));
}
void pmh7_register_clear_bit(uint16_t reg, uint8_t bit)
{
uint8_t val;
val = pmh7_register_read(reg);
pmh7_register_write(reg, val & ~(1 << bit));
}
void print_usage(const char *name)
{
printf("usage: %s\n", name);
printf("\n"
" -h, --help: print this help\n"
" -d, --dump: print registers\n"
" -w, --write <addr> <data>: write to register\n"
" -r, --read <addr>: read from register\n"
" -c, --clear-bit <addr> <bit>\n"
" -s, --set-bit <addr> <bit>\n"
"\n"
"Attention! Writing to PMH7 registers is very dangerous, as you\n"
" directly manipulate the power rails, enable lines,\n"
" interrupt lines or something else of the device.\n"
" Proceed with caution."
"\n");
}
enum action {HELP, DUMP, WRITE, READ, CLEAR, SET};
int main(int argc, char *argv[])
{
enum action act = HELP;
int opt, option_index = 0;
long input_addr = 0, input_data = 0;
static struct option long_options[] = {
{"help", 0, 0, 'h'},
{"dump", 0, 0, 'd'},
{"write", 1, 0, 'w'},
{"read", 1, 0, 'r'},
{"clear-bit", 1, 0, 'c'},
{"set-bit", 1, 0, 's'},
{0, 0, 0, 0}
};
if (argv[1] == NULL) {
print_usage(argv[0]);
exit(0);
}
while ((opt = getopt_long(argc, argv, "hdw:r:c:s:",
long_options, &option_index)) != EOF) {
switch (opt) {
case 'd':
act = DUMP;
break;
case 'r':
input_addr = strtoul(optarg, NULL, 16);
act = READ;
break;
case 'w':
case 'c':
case 's':
input_addr = strtoul(optarg, NULL, 16);
if (optind < argc && *argv[optind] != '-') {
input_data = strtoul(argv[optind], NULL, 16);
optind++;
} else {
fprintf(stderr,
"Error: -%c option requires two arguments\n",
opt);
exit(1);
}
switch (opt) {
case 'w':
act = WRITE;
break;
case 'c':
act = CLEAR;
break;
case 's':
act = SET;
break;
}
break;
}
}
if (optind < argc) {
fprintf(stderr, "Error: Extra parameter found.\n");
print_usage(argv[0]);
exit(1);
}
if (act == HELP) {
print_usage(argv[0]);
exit(0);
}
if (input_addr > 0x1ff) {
fprintf(stderr,
"Error: <addr> cannot be greater than 9 bits long.\n");
exit(1);
}
if (act == SET || act == CLEAR) {
if (input_data > 7) {
fprintf(stderr,
"Error: <bit> cannot be greater than 7.\n");
exit(1);
}
} else {
if (input_data > 0xff) {
fprintf(stderr,
"Error: <data> cannot be greater than 8 bits long.\n");
exit(1);
}
}
if (geteuid() != 0) {
fprintf(stderr, "You must be root.\n");
exit(1);
}
if (ioperm(EC_LENOVO_PMH7_BASE, 0x10, 1)) {
fprintf(stderr, "ioperm: %s\n", strerror(errno));
exit(1);
}
switch (act) {
case DUMP:
for (int i = 0; i < 0x200; i++) {
if ((i % 0x10) == 0) {
if (i != 0)
printf("\n");
printf("%04x: ", i);
}
printf("%02x ", pmh7_register_read(i));
}
printf("\n");
break;
case READ:
printf("%02x\n", pmh7_register_read(input_addr));
break;
case WRITE:
pmh7_register_write(input_addr, input_data);
break;
case CLEAR:
pmh7_register_clear_bit(input_addr, input_data);
break;
case SET:
pmh7_register_set_bit(input_addr, input_data);
break;
default:
break;
}
return 0;
}

29
util/pmh7tool/pmh7tool.h Normal file
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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2018 Evgeny Zinoviev <me@ch1p.com>
*
* 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.
*/
#ifndef PMH7TOOL_H
#define PMH7TOOL_H
#define EC_LENOVO_PMH7_BASE 0x15e0
#define EC_LENOVO_PMH7_ADDR_L (EC_LENOVO_PMH7_BASE + 0x0c)
#define EC_LENOVO_PMH7_ADDR_H (EC_LENOVO_PMH7_BASE + 0x0d)
#define EC_LENOVO_PMH7_DATA (EC_LENOVO_PMH7_BASE + 0x0e)
uint8_t pmh7_register_read(uint16_t reg);
void pmh7_register_write(uint16_t reg, uint8_t val);
void pmh7_register_set_bit(uint16_t reg, uint8_t bit);
void pmh7_register_clear_bit(uint16_t reg, uint8_t bit);
#endif /* PMH7TOOL_H */