<commit_before>/* 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 "registers.h"
#include "switch.h"
#include "system.h"
#include "timer.h"
#include "util.h"
#include "watchdog.h"

#define FLASH_FWB_WORDS 32
#define FLASH_FWB_BYTES (FLASH_FWB_WORDS * 4)

#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))

/* Flash timeouts.  These are 2x the spec sheet max. */
#define ERASE_TIMEOUT_MS 200
#define WRITE_TIMEOUT_US 300

int stuck_locked;  /* Is physical flash stuck protected? */
int all_protected; /* Has all-flash protection been requested? */

/**
 * Protect flash banks until reboot.
 *
 * @param start_bank    Start bank to protect
 * @param bank_count    Number of banks to protect
 */
static void protect_banks(int start_bank, int bank_count)
{
	int bank;
	for (bank = start_bank; bank < start_bank + bank_count; bank++)
		LM4_FLASH_FMPPE[F_BANK(bank)] &= ~F_BIT(bank);
}

/**
 * Perform a write-buffer operation.  Buffer (FWB) and address (FMA) must be
 * pre-loaded.
 *
 * @return EC_SUCCESS, or nonzero if error.
 */
static int write_buffer(void)
{
	int t;

	if (all_protected)
		return EC_ERROR_ACCESS_DENIED;

	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;

	/*
	 * Reload the watchdog timer, so that writing a large amount of flash
	 * doesn't cause a watchdog reset.
	 */
	watchdog_reload();

	/* Wait for write to complete */
	for (t = 0; LM4_FLASH_FMC2 & 0x01; t += 10) {
		if (t > WRITE_TIMEOUT_US)
			return EC_ERROR_TIMEOUT;
		udelay(10);
	}

	/* Check for error conditions - program failed, erase needed,
	 * voltage error. */
	if (LM4_FLASH_FCRIS & 0x2e01)
		return EC_ERROR_UNKNOWN;

	return EC_SUCCESS;
}

/*****************************************************************************/
/* Physical layer APIs */

int flash_physical_write(int offset, int size, const char *data)
{
	const uint32_t *data32 = (const uint32_t *)data;
	int rv;
	int i;

	if (all_protected)
		return EC_ERROR_ACCESS_DENIED;

	/* 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;
		}
	}<commit_msg>lm4: Verify data buffer is aligned for flash writes<commit_after>/* 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 "registers.h"
#include "switch.h"
#include "system.h"
#include "timer.h"
#include "util.h"
#include "watchdog.h"

#define FLASH_FWB_WORDS 32
#define FLASH_FWB_BYTES (FLASH_FWB_WORDS * 4)

#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))

/* Flash timeouts.  These are 2x the spec sheet max. */
#define ERASE_TIMEOUT_MS 200
#define WRITE_TIMEOUT_US 300

int stuck_locked;  /* Is physical flash stuck protected? */
int all_protected; /* Has all-flash protection been requested? */

/**
 * Protect flash banks until reboot.
 *
 * @param start_bank    Start bank to protect
 * @param bank_count    Number of banks to protect
 */
static void protect_banks(int start_bank, int bank_count)
{
	int bank;
	for (bank = start_bank; bank < start_bank + bank_count; bank++)
		LM4_FLASH_FMPPE[F_BANK(bank)] &= ~F_BIT(bank);
}

/**
 * Perform a write-buffer operation.  Buffer (FWB) and address (FMA) must be
 * pre-loaded.
 *
 * @return EC_SUCCESS, or nonzero if error.
 */
static int write_buffer(void)
{
	int t;

	if (all_protected)
		return EC_ERROR_ACCESS_DENIED;

	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;

	/*
	 * Reload the watchdog timer, so that writing a large amount of flash
	 * doesn't cause a watchdog reset.
	 */
	watchdog_reload();

	/* Wait for write to complete */
	for (t = 0; LM4_FLASH_FMC2 & 0x01; t += 10) {
		if (t > WRITE_TIMEOUT_US)
			return EC_ERROR_TIMEOUT;
		udelay(10);
	}

	/* Check for error conditions - program failed, erase needed,
	 * voltage error. */
	if (LM4_FLASH_FCRIS & 0x2e01)
		return EC_ERROR_UNKNOWN;

	return EC_SUCCESS;
}

/*****************************************************************************/
/* Physical layer APIs */

int flash_physical_write(int offset, int size, const char *data)
{
	const uint32_t *data32 = (const uint32_t *)data;
	int rv;
	int i;

	if (all_protected)
		return EC_ERROR_ACCESS_DENIED;

	/* Fail if offset, size, and data aren't at least word-aligned */
	if ((offset | size | (uint32_t)(uintptr_t)data) & 3)
		return EC_ERROR_INVAL;

	/* 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;
		}
	}
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