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/* Copyright (c) 2012 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.
*/
/* Flash memory module for Chrome EC */
#include "flash.h"
#include "uart.h"
#include "registers.h"
#include "util.h"
#define FLASH_WRITE_BYTES 4
#define FLASH_FWB_WORDS 32
#define FLASH_FWB_BYTES (FLASH_FWB_WORDS * 4)
#define FLASH_ERASE_BYTES 1024
#define FLASH_PROTECT_BYTES 2048
#define BANK_SHIFT 5 /* bank registers have 32bits each, 2^32 */
#define BANK_MASK ((1 << BANK_SHIFT) - 1) /* 5 bits */
#define F_BANK(b) ((b) >> BANK_SHIFT)
#define F_BIT(b) (1 << ((b) & BANK_MASK))
int flash_get_write_block_size(void)
{
return FLASH_WRITE_BYTES;
}
int flash_get_erase_block_size(void)
{
return FLASH_ERASE_BYTES;
}
int flash_get_protect_block_size(void)
{
BUILD_ASSERT(FLASH_PROTECT_BYTES == CONFIG_FLASH_BANK_SIZE);
return FLASH_PROTECT_BYTES;
}
int flash_physical_size(void)
{
return (LM4_FLASH_FSIZE + 1) * FLASH_PROTECT_BYTES;
}
int flash_physical_read(int offset, int size, char *data)
{
/* Just read the flash from its memory window. */
/* TODO: (crosbug.com/p/7473) is this affected by data cache?
* That is, if we read a block, then alter it, then read it
* again, do we get the old data? */
memcpy(data, (char *)offset, size);
return EC_SUCCESS;
}
/* Perform a write-buffer operation. Buffer (FWB) and address (FMA) must be
* pre-loaded. */
static int write_buffer(void)
{
if (!LM4_FLASH_FWBVAL)
return EC_SUCCESS; /* Nothing to do */
/* Clear previous error status */
LM4_FLASH_FCMISC = LM4_FLASH_FCRIS;
/* Start write operation at page boundary */
LM4_FLASH_FMC2 = 0xa4420001;
/* Wait for write to complete */
/* TODO: timeout */
while (LM4_FLASH_FMC2 & 0x01) {}
/* Check for error conditions - program failed, erase needed,
* voltage error. */
if (LM4_FLASH_FCRIS & 0x2e01)
return EC_ERROR_UNKNOWN;
return EC_SUCCESS;
}
int flash_physical_write(int offset, int size, const char *data)
{
const uint32_t *data32 = (const uint32_t *)data;
int rv;
int i;
/* Get initial write buffer index and page */
LM4_FLASH_FMA = offset & ~(FLASH_FWB_BYTES - 1);
i = (offset >> 2) & (FLASH_FWB_WORDS - 1);
/* Copy words into buffer */
for ( ; size > 0; size -= 4) {
LM4_FLASH_FWB[i++] = *data32++;
if (i == FLASH_FWB_WORDS) {
rv = write_buffer();
if (rv != EC_SUCCESS)
return rv;
/* Advance to next page */
i = 0;
LM4_FLASH_FMA += FLASH_FWB_BYTES;
}
}
/* Handle final partial page, if any */
if (i > 0) {
rv = write_buffer();
if (rv != EC_SUCCESS)
return rv;
}
return EC_SUCCESS;
}
int flash_physical_erase(int offset, int size)
{
LM4_FLASH_FCMISC = LM4_FLASH_FCRIS; /* Clear previous error status */
LM4_FLASH_FMA = offset;
for ( ; size > 0; size -= FLASH_ERASE_BYTES) {
/* Start erase */
LM4_FLASH_FMC = 0xa4420002;
/* Wait for erase to complete */
/* TODO: timeout */
while (LM4_FLASH_FMC & 0x02) {}
/* Check for error conditions - erase failed, voltage error,
* protection error */
if (LM4_FLASH_FCRIS & 0x0a01)
return EC_ERROR_UNKNOWN;
LM4_FLASH_FMA += FLASH_ERASE_BYTES;
}
return EC_SUCCESS;
}
int flash_physical_get_protect(int block)
{
return (LM4_FLASH_FMPPE[F_BANK(block)] & F_BIT(block)) ? 0 : 1;
}
void flash_physical_set_protect(int block)
{
LM4_FLASH_FMPPE[F_BANK(block)] &= ~F_BIT(block);
}
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