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// SPDX-License-Identifier: GPL-2.0-or-later
/***************************************************************************
* Copyright (C) 2005 by Dominic Rath *
* Dominic.Rath@gmx.de *
* *
* Copyright (C) 2008 by Spencer Oliver *
* spen@spen-soft.co.uk *
*
* Copyright (C) 2011 by Erik Botö
* erik.boto@pelagicore.com
***************************************************************************/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "imp.h"
#include <helper/binarybuffer.h>
#include <target/algorithm.h>
#include <target/armv7m.h>
/* em357 register locations */
#define EM357_FLASH_ACR 0x40008000
#define EM357_FLASH_KEYR 0x40008004
#define EM357_FLASH_OPTKEYR 0x40008008
#define EM357_FLASH_SR 0x4000800C
#define EM357_FLASH_CR 0x40008010
#define EM357_FLASH_AR 0x40008014
#define EM357_FLASH_OBR 0x4000801C
#define EM357_FLASH_WRPR 0x40008020
#define EM357_FPEC_CLK 0x4000402c
/* option byte location */
#define EM357_OB_RDP 0x08040800
#define EM357_OB_WRP0 0x08040808
#define EM357_OB_WRP1 0x0804080A
#define EM357_OB_WRP2 0x0804080C
/* FLASH_CR register bits */
#define FLASH_PG (1 << 0)
#define FLASH_PER (1 << 1)
#define FLASH_MER (1 << 2)
#define FLASH_OPTPG (1 << 4)
#define FLASH_OPTER (1 << 5)
#define FLASH_STRT (1 << 6)
#define FLASH_LOCK (1 << 7)
#define FLASH_OPTWRE (1 << 9)
/* FLASH_SR register bits */
#define FLASH_BSY (1 << 0)
#define FLASH_PGERR (1 << 2)
#define FLASH_WRPRTERR (1 << 4)
#define FLASH_EOP (1 << 5)
/* EM357_FLASH_OBR bit definitions (reading) */
#define OPT_ERROR 0
#define OPT_READOUT 1
/* register unlock keys */
#define KEY1 0x45670123
#define KEY2 0xCDEF89AB
struct em357_options {
uint16_t RDP;
uint16_t user_options;
uint16_t protection[3];
};
struct em357_flash_bank {
struct em357_options option_bytes;
int ppage_size;
bool probed;
};
static int em357_mass_erase(struct flash_bank *bank);
/* flash bank em357 <base> <size> 0 0 <target#>
*/
FLASH_BANK_COMMAND_HANDLER(em357_flash_bank_command)
{
struct em357_flash_bank *em357_info;
if (CMD_ARGC < 6)
return ERROR_COMMAND_SYNTAX_ERROR;
em357_info = malloc(sizeof(struct em357_flash_bank));
bank->driver_priv = em357_info;
em357_info->probed = false;
return ERROR_OK;
}
static inline int em357_get_flash_status(struct flash_bank *bank, uint32_t *status)
{
struct target *target = bank->target;
return target_read_u32(target, EM357_FLASH_SR, status);
}
static int em357_wait_status_busy(struct flash_bank *bank, int timeout)
{
struct target *target = bank->target;
uint32_t status;
int retval = ERROR_OK;
/* wait for busy to clear */
for (;; ) {
retval = em357_get_flash_status(bank, &status);
if (retval != ERROR_OK)
return retval;
LOG_DEBUG("status: 0x%" PRIx32 "", status);
if ((status & FLASH_BSY) == 0)
break;
if (timeout-- <= 0) {
LOG_ERROR("timed out waiting for flash");
return ERROR_FAIL;
}
alive_sleep(1);
}
if (status & FLASH_WRPRTERR) {
LOG_ERROR("em357 device protected");
retval = ERROR_FAIL;
}
if (status & FLASH_PGERR) {
LOG_ERROR("em357 device programming failed");
retval = ERROR_FAIL;
}
/* Clear but report errors */
if (status & (FLASH_WRPRTERR | FLASH_PGERR)) {
/* If this operation fails, we ignore it and report the original
* retval
*/
target_write_u32(target, EM357_FLASH_SR, FLASH_WRPRTERR | FLASH_PGERR);
}
return retval;
}
static int em357_read_options(struct flash_bank *bank)
{
uint32_t optiondata;
struct em357_flash_bank *em357_info = NULL;
struct target *target = bank->target;
em357_info = bank->driver_priv;
/* read current option bytes */
int retval = target_read_u32(target, EM357_FLASH_OBR, &optiondata);
if (retval != ERROR_OK)
return retval;
em357_info->option_bytes.user_options = (uint16_t)0xFFFC | ((optiondata >> 2) & 0x03);
em357_info->option_bytes.RDP = (optiondata & (1 << OPT_READOUT)) ? 0xFFFF : 0x5AA5;
if (optiondata & (1 << OPT_READOUT))
LOG_INFO("Device Security Bit Set");
/* each bit refers to a 4bank protection */
retval = target_read_u32(target, EM357_FLASH_WRPR, &optiondata);
if (retval != ERROR_OK)
return retval;
em357_info->option_bytes.protection[0] = (uint16_t)optiondata;
em357_info->option_bytes.protection[1] = (uint16_t)(optiondata >> 8);
em357_info->option_bytes.protection[2] = (uint16_t)(optiondata >> 16);
return ERROR_OK;
}
static int em357_erase_options(struct flash_bank *bank)
{
struct em357_flash_bank *em357_info = NULL;
struct target *target = bank->target;
em357_info = bank->driver_priv;
/* read current options */
em357_read_options(bank);
/* unlock flash registers */
int retval = target_write_u32(target, EM357_FLASH_KEYR, KEY1);
if (retval != ERROR_OK)
return retval;
retval = target_write_u32(target, EM357_FLASH_KEYR, KEY2);
if (retval != ERROR_OK)
return retval;
/* unlock option flash registers */
retval = target_write_u32(target, EM357_FLASH_OPTKEYR, KEY1);
if (retval != ERROR_OK)
return retval;
retval = target_write_u32(target, EM357_FLASH_OPTKEYR, KEY2);
if (retval != ERROR_OK)
return retval;
/* erase option bytes */
retval = target_write_u32(target, EM357_FLASH_CR, FLASH_OPTER | FLASH_OPTWRE);
if (retval != ERROR_OK)
return retval;
retval = target_write_u32(target, EM357_FLASH_CR, FLASH_OPTER | FLASH_STRT | FLASH_OPTWRE);
if (retval != ERROR_OK)
return retval;
retval = em357_wait_status_busy(bank, 10);
if (retval != ERROR_OK)
return retval;
/* clear readout protection and complementary option bytes
* this will also force a device unlock if set */
em357_info->option_bytes.RDP = 0x5AA5;
return ERROR_OK;
}
static int em357_write_options(struct flash_bank *bank)
{
struct em357_flash_bank *em357_info = NULL;
struct target *target = bank->target;
em357_info = bank->driver_priv;
/* unlock flash registers */
int retval = target_write_u32(target, EM357_FLASH_KEYR, KEY1);
if (retval != ERROR_OK)
return retval;
retval = target_write_u32(target, EM357_FLASH_KEYR, KEY2);
if (retval != ERROR_OK)
return retval;
/* unlock option flash registers */
retval = target_write_u32(target, EM357_FLASH_OPTKEYR, KEY1);
if (retval != ERROR_OK)
return retval;
retval = target_write_u32(target, EM357_FLASH_OPTKEYR, KEY2);
if (retval != ERROR_OK)
return retval;
/* program option bytes */
retval = target_write_u32(target, EM357_FLASH_CR, FLASH_OPTPG | FLASH_OPTWRE);
if (retval != ERROR_OK)
return retval;
retval = em357_wait_status_busy(bank, 10);
if (retval != ERROR_OK)
return retval;
/* write protection byte 1 */
retval = target_write_u16(target, EM357_OB_WRP0, em357_info->option_bytes.protection[0]);
if (retval != ERROR_OK)
return retval;
retval = em357_wait_status_busy(bank, 10);
if (retval != ERROR_OK)
return retval;
/* write protection byte 2 */
retval = target_write_u16(target, EM357_OB_WRP1, em357_info->option_bytes.protection[1]);
if (retval != ERROR_OK)
return retval;
retval = em357_wait_status_busy(bank, 10);
if (retval != ERROR_OK)
return retval;
/* write protection byte 3 */
retval = target_write_u16(target, EM357_OB_WRP2, em357_info->option_bytes.protection[2]);
if (retval != ERROR_OK)
return retval;
retval = em357_wait_status_busy(bank, 10);
if (retval != ERROR_OK)
return retval;
/* write readout protection bit */
retval = target_write_u16(target, EM357_OB_RDP, em357_info->option_bytes.RDP);
if (retval != ERROR_OK)
return retval;
retval = em357_wait_status_busy(bank, 10);
if (retval != ERROR_OK)
return retval;
retval = target_write_u32(target, EM357_FLASH_CR, FLASH_LOCK);
if (retval != ERROR_OK)
return retval;
return ERROR_OK;
}
static int em357_protect_check(struct flash_bank *bank)
{
struct target *target = bank->target;
struct em357_flash_bank *em357_info = bank->driver_priv;
uint32_t protection;
int i, s;
int num_bits;
int set;
if (target->state != TARGET_HALTED) {
LOG_ERROR("Target not halted");
return ERROR_TARGET_NOT_HALTED;
}
/* each bit refers to a 4bank protection (bit 0-23) */
int retval = target_read_u32(target, EM357_FLASH_WRPR, &protection);
if (retval != ERROR_OK)
return retval;
/* each protection bit is for 4 * 2K pages */
num_bits = (bank->num_sectors / em357_info->ppage_size);
for (i = 0; i < num_bits; i++) {
set = 1;
if (protection & (1 << i))
set = 0;
for (s = 0; s < em357_info->ppage_size; s++)
bank->sectors[(i * em357_info->ppage_size) + s].is_protected = set;
}
return ERROR_OK;
}
static int em357_erase(struct flash_bank *bank, unsigned int first,
unsigned int last)
{
struct target *target = bank->target;
if (bank->target->state != TARGET_HALTED) {
LOG_ERROR("Target not halted");
return ERROR_TARGET_NOT_HALTED;
}
if ((first == 0) && (last == (bank->num_sectors - 1)))
return em357_mass_erase(bank);
/* Enable FPEC clock */
target_write_u32(target, EM357_FPEC_CLK, 0x00000001);
/* unlock flash registers */
int retval = target_write_u32(target, EM357_FLASH_KEYR, KEY1);
if (retval != ERROR_OK)
return retval;
retval = target_write_u32(target, EM357_FLASH_KEYR, KEY2);
if (retval != ERROR_OK)
return retval;
for (unsigned int i = first; i <= last; i++) {
retval = target_write_u32(target, EM357_FLASH_CR, FLASH_PER);
if (retval != ERROR_OK)
return retval;
retval = target_write_u32(target, EM357_FLASH_AR,
bank->base + bank->sectors[i].offset);
if (retval != ERROR_OK)
return retval;
retval = target_write_u32(target, EM357_FLASH_CR, FLASH_PER | FLASH_STRT);
if (retval != ERROR_OK)
return retval;
retval = em357_wait_status_busy(bank, 100);
if (retval != ERROR_OK)
return retval;
}
retval = target_write_u32(target, EM357_FLASH_CR, FLASH_LOCK);
if (retval != ERROR_OK)
return retval;
return ERROR_OK;
}
static int em357_protect(struct flash_bank *bank, int set, unsigned int first,
unsigned int last)
{
struct em357_flash_bank *em357_info = NULL;
struct target *target = bank->target;
uint16_t prot_reg[4] = {0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF};
int reg, bit;
int status;
uint32_t protection;
em357_info = bank->driver_priv;
if (target->state != TARGET_HALTED) {
LOG_ERROR("Target not halted");
return ERROR_TARGET_NOT_HALTED;
}
if ((first % em357_info->ppage_size) != 0) {
LOG_WARNING("aligned start protect sector to a %d sector boundary",
em357_info->ppage_size);
first = first - (first % em357_info->ppage_size);
}
if (((last + 1) % em357_info->ppage_size) != 0) {
LOG_WARNING("aligned end protect sector to a %d sector boundary",
em357_info->ppage_size);
last++;
last = last - (last % em357_info->ppage_size);
last--;
}
/* each bit refers to a 4bank protection */
int retval = target_read_u32(target, EM357_FLASH_WRPR, &protection);
if (retval != ERROR_OK)
return retval;
prot_reg[0] = (uint16_t)protection;
prot_reg[1] = (uint16_t)(protection >> 8);
prot_reg[2] = (uint16_t)(protection >> 16);
for (unsigned int i = first; i <= last; i++) {
reg = (i / em357_info->ppage_size) / 8;
bit = (i / em357_info->ppage_size) - (reg * 8);
LOG_WARNING("reg, bit: %d, %d", reg, bit);
if (set)
prot_reg[reg] &= ~(1 << bit);
else
prot_reg[reg] |= (1 << bit);
}
status = em357_erase_options(bank);
if (retval != ERROR_OK)
return status;
em357_info->option_bytes.protection[0] = prot_reg[0];
em357_info->option_bytes.protection[1] = prot_reg[1];
em357_info->option_bytes.protection[2] = prot_reg[2];
return em357_write_options(bank);
}
static int em357_write_block(struct flash_bank *bank, const uint8_t *buffer,
uint32_t offset, uint32_t count)
{
struct target *target = bank->target;
uint32_t buffer_size = 16384;
struct working_area *write_algorithm;
struct working_area *source;
uint32_t address = bank->base + offset;
struct reg_param reg_params[4];
struct armv7m_algorithm armv7m_info;
int retval = ERROR_OK;
/* see contrib/loaders/flash/stm32x.s for src, the same is used here except for
* a modified *_FLASH_BASE */
static const uint8_t em357_flash_write_code[] = {
/* #define EM357_FLASH_CR_OFFSET 0x10
* #define EM357_FLASH_SR_OFFSET 0x0C
* write: */
0x08, 0x4c, /* ldr r4, EM357_FLASH_BASE */
0x1c, 0x44, /* add r4, r3 */
/* write_half_word: */
0x01, 0x23, /* movs r3, #0x01 */
0x23, 0x61, /* str r3, [r4,
*#EM357_FLASH_CR_OFFSET] */
0x30, 0xf8, 0x02, 0x3b, /* ldrh r3, [r0], #0x02 */
0x21, 0xf8, 0x02, 0x3b, /* strh r3, [r1], #0x02 */
/* busy: */
0xe3, 0x68, /* ldr r3, [r4,
*#EM357_FLASH_SR_OFFSET] */
0x13, 0xf0, 0x01, 0x0f, /* tst r3, #0x01 */
0xfb, 0xd0, /* beq busy */
0x13, 0xf0, 0x14, 0x0f, /* tst r3, #0x14 */
0x01, 0xd1, /* bne exit */
0x01, 0x3a, /* subs r2, r2, #0x01 */
0xf0, 0xd1, /* bne write_half_word */
/* exit: */
0x00, 0xbe, /* bkpt #0x00 */
0x00, 0x80, 0x00, 0x40, /* EM357_FLASH_BASE: .word 0x40008000 */
};
/* flash write code */
if (target_alloc_working_area(target, sizeof(em357_flash_write_code),
&write_algorithm) != ERROR_OK) {
LOG_WARNING("no working area available, can't do block memory writes");
return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
}
retval = target_write_buffer(target, write_algorithm->address,
sizeof(em357_flash_write_code), em357_flash_write_code);
if (retval != ERROR_OK)
return retval;
/* memory buffer */
while (target_alloc_working_area_try(target, buffer_size, &source) != ERROR_OK) {
buffer_size /= 2;
if (buffer_size <= 256) {
/* we already allocated the writing code, but failed to get a
* buffer, free the algorithm */
target_free_working_area(target, write_algorithm);
LOG_WARNING(
"no large enough working area available, can't do block memory writes");
return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
}
}
armv7m_info.common_magic = ARMV7M_COMMON_MAGIC;
armv7m_info.core_mode = ARM_MODE_THREAD;
init_reg_param(®_params[0], "r0", 32, PARAM_OUT);
init_reg_param(®_params[1], "r1", 32, PARAM_OUT);
init_reg_param(®_params[2], "r2", 32, PARAM_OUT);
init_reg_param(®_params[3], "r3", 32, PARAM_IN_OUT);
while (count > 0) {
uint32_t thisrun_count = (count > (buffer_size / 2)) ?
(buffer_size / 2) : count;
retval = target_write_buffer(target, source->address, thisrun_count * 2, buffer);
if (retval != ERROR_OK)
break;
buf_set_u32(reg_params[0].value, 0, 32, source->address);
buf_set_u32(reg_params[1].value, 0, 32, address);
buf_set_u32(reg_params[2].value, 0, 32, thisrun_count);
buf_set_u32(reg_params[3].value, 0, 32, 0);
retval = target_run_algorithm(target, 0, NULL, 4, reg_params,
write_algorithm->address, 0, 10000, &armv7m_info);
if (retval != ERROR_OK) {
LOG_ERROR("error executing em357 flash write algorithm");
break;
}
if (buf_get_u32(reg_params[3].value, 0, 32) & FLASH_PGERR) {
LOG_ERROR("flash memory not erased before writing");
/* Clear but report errors */
target_write_u32(target, EM357_FLASH_SR, FLASH_PGERR);
retval = ERROR_FAIL;
break;
}
if (buf_get_u32(reg_params[3].value, 0, 32) & FLASH_WRPRTERR) {
LOG_ERROR("flash memory write protected");
/* Clear but report errors */
target_write_u32(target, EM357_FLASH_SR, FLASH_WRPRTERR);
retval = ERROR_FAIL;
break;
}
buffer += thisrun_count * 2;
address += thisrun_count * 2;
count -= thisrun_count;
}
target_free_working_area(target, source);
target_free_working_area(target, write_algorithm);
destroy_reg_param(®_params[0]);
destroy_reg_param(®_params[1]);
destroy_reg_param(®_params[2]);
destroy_reg_param(®_params[3]);
return retval;
}
static int em357_write(struct flash_bank *bank, const uint8_t *buffer,
uint32_t offset, uint32_t count)
{
struct target *target = bank->target;
uint32_t words_remaining = (count / 2);
uint32_t bytes_remaining = (count & 0x00000001);
uint32_t address = bank->base + offset;
uint32_t bytes_written = 0;
int retval;
if (bank->target->state != TARGET_HALTED) {
LOG_ERROR("Target not halted");
return ERROR_TARGET_NOT_HALTED;
}
if (offset & 0x1) {
LOG_WARNING("offset 0x%" PRIx32 " breaks required 2-byte alignment", offset);
return ERROR_FLASH_DST_BREAKS_ALIGNMENT;
}
/* unlock flash registers */
retval = target_write_u32(target, EM357_FLASH_KEYR, KEY1);
if (retval != ERROR_OK)
return retval;
retval = target_write_u32(target, EM357_FLASH_KEYR, KEY2);
if (retval != ERROR_OK)
return retval;
target_write_u32(target, EM357_FPEC_CLK, 0x00000001);
/* multiple half words (2-byte) to be programmed? */
if (words_remaining > 0) {
/* try using a block write */
retval = em357_write_block(bank, buffer, offset, words_remaining);
if (retval != ERROR_OK) {
if (retval == ERROR_TARGET_RESOURCE_NOT_AVAILABLE) {
/* if block write failed (no sufficient working area),
* we use normal (slow) single dword accesses */
LOG_WARNING(
"couldn't use block writes, falling back to single memory accesses");
}
} else {
buffer += words_remaining * 2;
address += words_remaining * 2;
words_remaining = 0;
}
}
if ((retval != ERROR_OK) && (retval != ERROR_TARGET_RESOURCE_NOT_AVAILABLE))
return retval;
while (words_remaining > 0) {
uint16_t value;
memcpy(&value, buffer + bytes_written, sizeof(uint16_t));
retval = target_write_u32(target, EM357_FLASH_CR, FLASH_PG);
if (retval != ERROR_OK)
return retval;
retval = target_write_u16(target, address, value);
if (retval != ERROR_OK)
return retval;
retval = em357_wait_status_busy(bank, 5);
if (retval != ERROR_OK)
return retval;
bytes_written += 2;
words_remaining--;
address += 2;
}
if (bytes_remaining) {
uint16_t value = 0xffff;
memcpy(&value, buffer + bytes_written, bytes_remaining);
retval = target_write_u32(target, EM357_FLASH_CR, FLASH_PG);
if (retval != ERROR_OK)
return retval;
retval = target_write_u16(target, address, value);
if (retval != ERROR_OK)
return retval;
retval = em357_wait_status_busy(bank, 5);
if (retval != ERROR_OK)
return retval;
}
return target_write_u32(target, EM357_FLASH_CR, FLASH_LOCK);
}
static int em357_probe(struct flash_bank *bank)
{
struct target *target = bank->target;
struct em357_flash_bank *em357_info = bank->driver_priv;
int i;
uint16_t num_pages;
int page_size;
uint32_t base_address = 0x08000000;
em357_info->probed = false;
switch (bank->size) {
case 0x10000:
/* 64k -- 64 1k pages */
num_pages = 64;
page_size = 1024;
break;
case 0x20000:
/* 128k -- 128 1k pages */
num_pages = 128;
page_size = 1024;
break;
case 0x30000:
/* 192k -- 96 2k pages */
num_pages = 96;
page_size = 2048;
break;
case 0x40000:
/* 256k -- 128 2k pages */
num_pages = 128;
page_size = 2048;
break;
case 0x80000:
/* 512k -- 256 2k pages */
num_pages = 256;
page_size = 2048;
break;
default:
LOG_WARNING("No size specified for em357 flash driver, assuming 192k!");
num_pages = 96;
page_size = 2048;
break;
}
/* Enable FPEC CLK */
int retval = target_write_u32(target, EM357_FPEC_CLK, 0x00000001);
if (retval != ERROR_OK)
return retval;
em357_info->ppage_size = 4;
LOG_INFO("flash size = %d KiB", num_pages * page_size / 1024);
free(bank->sectors);
bank->base = base_address;
bank->size = (num_pages * page_size);
bank->num_sectors = num_pages;
bank->sectors = malloc(sizeof(struct flash_sector) * num_pages);
for (i = 0; i < num_pages; i++) {
bank->sectors[i].offset = i * page_size;
bank->sectors[i].size = page_size;
bank->sectors[i].is_erased = -1;
bank->sectors[i].is_protected = 1;
}
em357_info->probed = true;
return ERROR_OK;
}
static int em357_auto_probe(struct flash_bank *bank)
{
struct em357_flash_bank *em357_info = bank->driver_priv;
if (em357_info->probed)
return ERROR_OK;
return em357_probe(bank);
}
COMMAND_HANDLER(em357_handle_lock_command)
{
struct target *target = NULL;
struct em357_flash_bank *em357_info = NULL;
if (CMD_ARGC < 1)
return ERROR_COMMAND_SYNTAX_ERROR;
struct flash_bank *bank;
int retval = CALL_COMMAND_HANDLER(flash_command_get_bank, 0, &bank);
if (retval != ERROR_OK)
return retval;
em357_info = bank->driver_priv;
target = bank->target;
if (target->state != TARGET_HALTED) {
LOG_ERROR("Target not halted");
return ERROR_TARGET_NOT_HALTED;
}
if (em357_erase_options(bank) != ERROR_OK) {
command_print(CMD, "em357 failed to erase options");
return ERROR_OK;
}
/* set readout protection */
em357_info->option_bytes.RDP = 0;
if (em357_write_options(bank) != ERROR_OK) {
command_print(CMD, "em357 failed to lock device");
return ERROR_OK;
}
command_print(CMD, "em357 locked");
return ERROR_OK;
}
COMMAND_HANDLER(em357_handle_unlock_command)
{
struct target *target = NULL;
if (CMD_ARGC < 1)
return ERROR_COMMAND_SYNTAX_ERROR;
struct flash_bank *bank;
int retval = CALL_COMMAND_HANDLER(flash_command_get_bank, 0, &bank);
if (retval != ERROR_OK)
return retval;
target = bank->target;
if (target->state != TARGET_HALTED) {
LOG_ERROR("Target not halted");
return ERROR_TARGET_NOT_HALTED;
}
if (em357_erase_options(bank) != ERROR_OK) {
command_print(CMD, "em357 failed to unlock device");
return ERROR_OK;
}
if (em357_write_options(bank) != ERROR_OK) {
command_print(CMD, "em357 failed to lock device");
return ERROR_OK;
}
command_print(CMD, "em357 unlocked.\n"
"INFO: a reset or power cycle is required "
"for the new settings to take effect.");
return ERROR_OK;
}
static int em357_mass_erase(struct flash_bank *bank)
{
struct target *target = bank->target;
if (target->state != TARGET_HALTED) {
LOG_ERROR("Target not halted");
return ERROR_TARGET_NOT_HALTED;
}
/* Make sure the flash clock is on */
target_write_u32(target, EM357_FPEC_CLK, 0x00000001);
/* unlock option flash registers */
int retval = target_write_u32(target, EM357_FLASH_KEYR, KEY1);
if (retval != ERROR_OK)
return retval;
retval = target_write_u32(target, EM357_FLASH_KEYR, KEY2);
if (retval != ERROR_OK)
return retval;
/* mass erase flash memory */
retval = target_write_u32(target, EM357_FLASH_CR, FLASH_MER);
if (retval != ERROR_OK)
return retval;
retval = target_write_u32(target, EM357_FLASH_CR, FLASH_MER | FLASH_STRT);
if (retval != ERROR_OK)
return retval;
retval = em357_wait_status_busy(bank, 100);
if (retval != ERROR_OK)
return retval;
retval = target_write_u32(target, EM357_FLASH_CR, FLASH_LOCK);
if (retval != ERROR_OK)
return retval;
return ERROR_OK;
}
COMMAND_HANDLER(em357_handle_mass_erase_command)
{
if (CMD_ARGC < 1)
return ERROR_COMMAND_SYNTAX_ERROR;
struct flash_bank *bank;
int retval = CALL_COMMAND_HANDLER(flash_command_get_bank, 0, &bank);
if (retval != ERROR_OK)
return retval;
retval = em357_mass_erase(bank);
if (retval == ERROR_OK)
command_print(CMD, "em357 mass erase complete");
else
command_print(CMD, "em357 mass erase failed");
return retval;
}
static const struct command_registration em357_exec_command_handlers[] = {
{
.name = "lock",
.usage = "<bank>",
.handler = em357_handle_lock_command,
.mode = COMMAND_EXEC,
.help = "Lock entire flash device.",
},
{
.name = "unlock",
.usage = "<bank>",
.handler = em357_handle_unlock_command,
.mode = COMMAND_EXEC,
.help = "Unlock entire protected flash device.",
},
{
.name = "mass_erase",
.usage = "<bank>",
.handler = em357_handle_mass_erase_command,
.mode = COMMAND_EXEC,
.help = "Erase entire flash device.",
},
COMMAND_REGISTRATION_DONE
};
static const struct command_registration em357_command_handlers[] = {
{
.name = "em357",
.mode = COMMAND_ANY,
.help = "em357 flash command group",
.usage = "",
.chain = em357_exec_command_handlers,
},
COMMAND_REGISTRATION_DONE
};
const struct flash_driver em357_flash = {
.name = "em357",
.commands = em357_command_handlers,
.flash_bank_command = em357_flash_bank_command,
.erase = em357_erase,
.protect = em357_protect,
.write = em357_write,
.read = default_flash_read,
.probe = em357_probe,
.auto_probe = em357_auto_probe,
.erase_check = default_flash_blank_check,
.protect_check = em357_protect_check,
.free_driver_priv = default_flash_free_driver_priv,
};
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