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/* Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
/* EEPROM module for Chrome EC */
#include "eeprom.h"
#include "console.h"
#include "uart.h"
#include "registers.h"
#include "util.h"
/* Size of EEPROM block in bytes */
#define EEPROM_BLOCK_SIZE 64
/* Count of EEPROM blocks */
static int block_count;
/* Waits for the current EEPROM operation to finish. */
static int wait_for_done(void)
{
/* TODO: how long is a reasonable timeout? */
int i;
for (i = 0; i < 1000000; i++) {
if (!(LM4_EEPROM_EEDONE & 0x01))
return EC_SUCCESS;
}
return EC_ERROR_UNKNOWN;
}
int eeprom_get_block_count(void)
{
return block_count;
}
int eeprom_get_block_size(void)
{
return EEPROM_BLOCK_SIZE;
}
int eeprom_read(int block, int offset, int size, char *data)
{
uint32_t *d = (uint32_t *)data;
int rv;
if (block < 0 || block >= block_count ||
offset < 0 || offset > EEPROM_BLOCK_SIZE || offset & 3 ||
size < 0 || offset + size >= EEPROM_BLOCK_SIZE || size & 3)
return EC_ERROR_UNKNOWN;
rv = wait_for_done();
if (rv)
return rv;
LM4_EEPROM_EEBLOCK = block;
if (LM4_EEPROM_EEBLOCK != block)
return EC_ERROR_UNKNOWN; /* Error setting block */
LM4_EEPROM_EEOFFSET = offset >> 2;
for ( ; size; size -= sizeof(uint32_t))
*(d++) = LM4_EEPROM_EERDWRINC;
return EC_SUCCESS;
}
int eeprom_write(int block, int offset, int size, const char *data)
{
uint32_t *d = (uint32_t *)data;
int rv;
if (block < 0 || block >= block_count ||
offset < 0 || offset > EEPROM_BLOCK_SIZE || offset & 3 ||
size < 0 || offset + size >= EEPROM_BLOCK_SIZE || size & 3)
return EC_ERROR_UNKNOWN;
rv = wait_for_done();
if (rv)
return rv;
LM4_EEPROM_EEBLOCK = block;
if (LM4_EEPROM_EEBLOCK != block)
return EC_ERROR_UNKNOWN; /* Error setting block */
LM4_EEPROM_EEOFFSET = offset >> 2;
/* Write 32 bits at a time; wait for each write to complete */
for ( ; size; size -= sizeof(uint32_t)) {
LM4_EEPROM_EERDWRINC = *(d++);
rv = wait_for_done();
if (rv)
return rv;
if (LM4_EEPROM_EEDONE)
return EC_ERROR_UNKNOWN;
}
return EC_SUCCESS;
}
int eeprom_hide(int block)
{
/* Block 0 can't be hidden */
if (block <= 0 || block >= block_count)
return EC_ERROR_UNKNOWN;
LM4_EEPROM_EEHIDE |= 1 << block;
return EC_SUCCESS;
}
/*****************************************************************************/
/* Console commands */
static int command_eeprom_info(int argc, char **argv)
{
uart_printf("EEPROM: %d blocks of %d bytes\n",
eeprom_get_block_count(), eeprom_get_block_size());
uart_printf(" Block-hide flags: 0x%08x\n", LM4_EEPROM_EEHIDE);
return EC_SUCCESS;
}
DECLARE_CONSOLE_COMMAND(eeinfo, command_eeprom_info);
static int command_eeprom_read(int argc, char **argv)
{
int block = 0;
int offset = 0;
char *e;
int rv;
uint32_t d;
if (argc < 2) {
uart_puts("Usage: eeread <block> [offset]\n");
return EC_ERROR_UNKNOWN;
}
block = strtoi(argv[1], &e, 0);
if (*e) {
uart_puts("Invalid block\n");
return EC_ERROR_UNKNOWN;
}
if (argc > 2) {
offset = strtoi(argv[2], &e, 0);
if (*e) {
uart_puts("Invalid offset\n");
return EC_ERROR_UNKNOWN;
}
}
rv = eeprom_read(block, offset, sizeof(d), (char *)&d);
if (rv == EC_SUCCESS)
uart_printf("Block %d offset %d = 0x%08x\n",
block, offset, d);
return rv;
}
DECLARE_CONSOLE_COMMAND(eeread, command_eeprom_read);
static int command_eeprom_write(int argc, char **argv)
{
int block = 0;
int offset = 0;
char *e;
int rv;
uint32_t d;
if (argc < 4) {
uart_puts("Usage: eeread <block> <offset> <data>\n");
return EC_ERROR_UNKNOWN;
}
block = strtoi(argv[1], &e, 0);
if (*e) {
uart_puts("Invalid block\n");
return EC_ERROR_UNKNOWN;
}
offset = strtoi(argv[2], &e, 0);
if (*e) {
uart_puts("Invalid offset\n");
return EC_ERROR_UNKNOWN;
}
d = strtoi(argv[3], &e, 0);
if (*e) {
uart_puts("Invalid data\n");
return EC_ERROR_UNKNOWN;
}
uart_printf("Writing 0x%08x to block %d offset %d...\n",
d, block, offset);
rv = eeprom_write(block, offset, sizeof(d), (char *)&d);
if (rv == EC_SUCCESS)
uart_puts("done.\n");
return rv;
}
DECLARE_CONSOLE_COMMAND(eewrite, command_eeprom_write);
static int command_eeprom_hide(int argc, char **argv)
{
int block = 0;
char *e;
int rv;
if (argc < 2) {
uart_puts("Usage: eehide <block>\n");
return EC_ERROR_UNKNOWN;
}
block = strtoi(argv[1], &e, 0);
if (*e) {
uart_puts("Invalid block\n");
return EC_ERROR_UNKNOWN;
}
uart_printf("Hiding EEPROM block %d...\n", block);
rv = eeprom_hide(block);
if (rv == EC_SUCCESS)
uart_printf("Done.\n");
return rv;
}
DECLARE_CONSOLE_COMMAND(eehide, command_eeprom_hide);
/*****************************************************************************/
/* Initialization */
int eeprom_init(void)
{
volatile uint32_t scratch __attribute__((unused));
/* Enable the EEPROM module and delay a few clocks */
LM4_SYSTEM_RCGCEEPROM = 1;
scratch = LM4_SYSTEM_RCGCEEPROM;
wait_for_done();
block_count = LM4_EEPROM_EESIZE >> 16;
return EC_SUCCESS;
}
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