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// SPDX-License-Identifier: BSD-3-Clause
/******************************************************************************
*
* @file ambiqmicro.c
*
* @brief Ambiq Micro flash driver.
*
*****************************************************************************/
/******************************************************************************
* Copyright (c) 2015, David Racine <dracine at ambiqmicro.com>
*
* Copyright (c) 2016, Rick Foos <rfoos at solengtech.com>
*
* Copyright (c) 2015-2016, Ambiq Micro, Inc.
*
* All rights reserved.
*****************************************************************************/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "jtag/interface.h"
#include "imp.h"
#include "target/algorithm.h"
#include "target/armv7m.h"
#include "target/cortex_m.h"
/** Check error, log error. */
#define CHECK_STATUS(rc, msg) { \
if (rc != ERROR_OK) { \
LOG_ERROR("status(%d):%s\n", rc, msg); } }
/*
* Address and Key defines.
*/
#define PROGRAM_KEY (0x12344321)
#define OTP_PROGRAM_KEY (0x87655678)
#define FLASH_PROGRAM_MAIN_FROM_SRAM 0x0800005d
#define FLASH_PROGRAM_OTP_FROM_SRAM 0x08000061
#define FLASH_ERASE_LIST_MAIN_PAGES_FROM_SRAM 0x08000065
#define FLASH_MASS_ERASE_MAIN_PAGES_FROM_SRAM 0x08000069
static const uint32_t apollo_flash_size[] = {
1 << 15,
1 << 16,
1 << 17,
1 << 18,
1 << 19,
1 << 20,
1 << 21
};
static const uint32_t apollo_sram_size[] = {
1 << 15,
1 << 16,
1 << 17,
1 << 18,
1 << 19,
1 << 20,
1 << 21
};
struct ambiqmicro_flash_bank {
/* chip id register */
bool probed;
const char *target_name;
uint8_t target_class;
uint32_t sramsiz;
uint32_t flshsiz;
/* flash geometry */
uint32_t num_pages;
uint32_t pagesize;
uint32_t pages_in_lockregion;
/* nv memory bits */
uint16_t num_lockbits;
/* main clock status */
uint32_t rcc;
uint32_t rcc2;
uint8_t mck_valid;
uint8_t xtal_mask;
uint32_t iosc_freq;
uint32_t mck_freq;
const char *iosc_desc;
const char *mck_desc;
};
static struct {
uint8_t class;
uint8_t partno;
const char *partname;
} ambiqmicro_parts[6] = {
{0xFF, 0x00, "Unknown"},
{0x01, 0x00, "Apollo"},
{0x02, 0x00, "Apollo2"},
{0x03, 0x00, "Unknown"},
{0x04, 0x00, "Unknown"},
{0x05, 0x00, "Apollo"},
};
static char *ambiqmicro_classname[6] = {
"Unknown", "Apollo", "Apollo2", "Unknown", "Unknown", "Apollo"
};
/***************************************************************************
* openocd command interface *
***************************************************************************/
/* flash_bank ambiqmicro <base> <size> 0 0 <target#>
*/
FLASH_BANK_COMMAND_HANDLER(ambiqmicro_flash_bank_command)
{
struct ambiqmicro_flash_bank *ambiqmicro_info;
if (CMD_ARGC < 6)
return ERROR_COMMAND_SYNTAX_ERROR;
ambiqmicro_info = calloc(1, sizeof(struct ambiqmicro_flash_bank));
bank->driver_priv = ambiqmicro_info;
ambiqmicro_info->target_name = "Unknown target";
/* part wasn't probed yet */
ambiqmicro_info->probed = false;
return ERROR_OK;
}
static int get_ambiqmicro_info(struct flash_bank *bank, struct command_invocation *cmd)
{
struct ambiqmicro_flash_bank *ambiqmicro_info = bank->driver_priv;
char *classname;
if (!ambiqmicro_info->probed) {
LOG_ERROR("Target not probed");
return ERROR_FLASH_BANK_NOT_PROBED;
}
/* Check class name in range. */
if (ambiqmicro_info->target_class < sizeof(ambiqmicro_classname))
classname = ambiqmicro_classname[ambiqmicro_info->target_class];
else
classname = ambiqmicro_classname[0];
command_print_sameline(cmd, "\nAmbiq Micro information: Chip is "
"class %d (%s) %s\n",
ambiqmicro_info->target_class,
classname,
ambiqmicro_info->target_name);
return ERROR_OK;
}
/***************************************************************************
* chip identification and status *
***************************************************************************/
/* Fill in driver info structure */
static int ambiqmicro_read_part_info(struct flash_bank *bank)
{
struct ambiqmicro_flash_bank *ambiqmicro_info = bank->driver_priv;
struct target *target = bank->target;
uint32_t part_num = 0;
int retval;
/*
* Read Part Number.
*/
retval = target_read_u32(target, 0x40020000, &part_num);
if (retval != ERROR_OK) {
LOG_ERROR("status(0x%x):Could not read part_num.\n", retval);
/* Set part_num to default device */
part_num = 0;
}
LOG_DEBUG("Part number: 0x%" PRIx32, part_num);
/*
* Determine device class.
*/
ambiqmicro_info->target_class = (part_num & 0xFF000000) >> 24;
switch (ambiqmicro_info->target_class) {
case 1: /* 1 - Apollo */
case 5: /* 5 - Apollo Bootloader */
bank->base = bank->bank_number * 0x40000;
ambiqmicro_info->pagesize = 2048;
ambiqmicro_info->flshsiz =
apollo_flash_size[(part_num & 0x00F00000) >> 20];
ambiqmicro_info->sramsiz =
apollo_sram_size[(part_num & 0x000F0000) >> 16];
ambiqmicro_info->num_pages = ambiqmicro_info->flshsiz /
ambiqmicro_info->pagesize;
if (ambiqmicro_info->num_pages > 128) {
ambiqmicro_info->num_pages = 128;
ambiqmicro_info->flshsiz = 1024 * 256;
}
break;
default:
LOG_INFO("Unknown Class. Using Apollo-64 as default.");
bank->base = bank->bank_number * 0x40000;
ambiqmicro_info->pagesize = 2048;
ambiqmicro_info->flshsiz = apollo_flash_size[1];
ambiqmicro_info->sramsiz = apollo_sram_size[0];
ambiqmicro_info->num_pages = ambiqmicro_info->flshsiz /
ambiqmicro_info->pagesize;
if (ambiqmicro_info->num_pages > 128) {
ambiqmicro_info->num_pages = 128;
ambiqmicro_info->flshsiz = 1024 * 256;
}
break;
}
if (ambiqmicro_info->target_class < ARRAY_SIZE(ambiqmicro_parts))
ambiqmicro_info->target_name =
ambiqmicro_parts[ambiqmicro_info->target_class].partname;
else
ambiqmicro_info->target_name =
ambiqmicro_parts[0].partname;
LOG_DEBUG("num_pages: %" PRIu32 ", pagesize: %" PRIu32 ", flash: %" PRIu32 ", sram: %" PRIu32,
ambiqmicro_info->num_pages,
ambiqmicro_info->pagesize,
ambiqmicro_info->flshsiz,
ambiqmicro_info->sramsiz);
return ERROR_OK;
}
/***************************************************************************
* flash operations *
***************************************************************************/
static int ambiqmicro_protect_check(struct flash_bank *bank)
{
struct ambiqmicro_flash_bank *ambiqmicro = bank->driver_priv;
int status = ERROR_OK;
uint32_t i;
if (!ambiqmicro->probed) {
LOG_ERROR("Target not probed");
return ERROR_FLASH_BANK_NOT_PROBED;
}
for (i = 0; i < (unsigned) bank->num_sectors; i++)
bank->sectors[i].is_protected = -1;
return status;
}
/** Read flash status from bootloader. */
static int check_flash_status(struct target *target, uint32_t address)
{
uint32_t retflash;
int rc;
rc = target_read_u32(target, address, &retflash);
/* target connection failed. */
if (rc != ERROR_OK) {
LOG_DEBUG("%s:%d:%s(): status(0x%x)\n",
__FILE__, __LINE__, __func__, rc);
return rc;
}
/* target flash failed, unknown cause. */
if (retflash != 0) {
LOG_ERROR("Flash not happy: status(0x%" PRIx32 ")", retflash);
return ERROR_FLASH_OPERATION_FAILED;
}
return ERROR_OK;
}
static int ambiqmicro_exec_command(struct target *target,
uint32_t command,
uint32_t flash_return_address)
{
int retval, retflash;
retval = target_resume(
target,
false,
command,
true,
true);
CHECK_STATUS(retval, "error executing ambiqmicro command");
/*
* Wait for halt.
*/
for (;; ) {
target_poll(target);
if (target->state == TARGET_HALTED)
break;
else if (target->state == TARGET_RUNNING ||
target->state == TARGET_DEBUG_RUNNING) {
/*
* Keep polling until target halts.
*/
target_poll(target);
alive_sleep(100);
LOG_DEBUG("state = %d", target->state);
} else {
LOG_ERROR("Target not halted or running %d", target->state);
break;
}
}
/*
* Read return value, flash error takes precedence.
*/
retflash = check_flash_status(target, flash_return_address);
if (retflash != ERROR_OK)
retval = retflash;
/* Return code from target_resume OR flash. */
return retval;
}
static int ambiqmicro_mass_erase(struct flash_bank *bank)
{
struct target *target = NULL;
struct ambiqmicro_flash_bank *ambiqmicro_info = NULL;
int retval = ERROR_OK;
ambiqmicro_info = bank->driver_priv;
target = bank->target;
if (target->state != TARGET_HALTED) {
LOG_ERROR("Target not halted");
return ERROR_TARGET_NOT_HALTED;
}
if (!ambiqmicro_info->probed) {
LOG_ERROR("Target not probed");
return ERROR_FLASH_BANK_NOT_PROBED;
}
/*
* Clear Bootloader bit.
*/
retval = target_write_u32(target, 0x400201a0, 0x0);
CHECK_STATUS(retval, "error clearing bootloader bit.");
/*
* Set up the SRAM.
*/
/*
* Bank.
*/
retval = target_write_u32(target, 0x10000000, bank->bank_number);
CHECK_STATUS(retval, "error writing target SRAM parameters.");
/*
* Write Key.
*/
retval = target_write_u32(target, 0x10000004, PROGRAM_KEY);
CHECK_STATUS(retval, "error writing target SRAM parameters.");
/*
* Breakpoint.
*/
retval = target_write_u32(target, 0x10000008, 0xfffffffe);
CHECK_STATUS(retval, "error writing target SRAM parameters.");
/*
* Erase the main array.
*/
LOG_INFO("Mass erase on bank %d.", bank->bank_number);
/*
* passed pc, addr = ROM function, handle breakpoints, not debugging.
*/
retval = ambiqmicro_exec_command(target, FLASH_MASS_ERASE_MAIN_PAGES_FROM_SRAM, 0x10000008);
CHECK_STATUS(retval, "error executing ambiqmicro flash mass erase.");
if (retval != ERROR_OK)
return retval;
/*
* Set Bootloader bit, regardless of command execution.
*/
retval = target_write_u32(target, 0x400201a0, 0x1);
CHECK_STATUS(retval, "error setting bootloader bit.");
return retval;
}
static int ambiqmicro_erase(struct flash_bank *bank, unsigned int first,
unsigned int last)
{
struct ambiqmicro_flash_bank *ambiqmicro_info = bank->driver_priv;
struct target *target = bank->target;
int retval;
if (bank->target->state != TARGET_HALTED) {
LOG_ERROR("Target not halted");
return ERROR_TARGET_NOT_HALTED;
}
if (!ambiqmicro_info->probed) {
LOG_ERROR("Target not probed");
return ERROR_FLASH_BANK_NOT_PROBED;
}
/*
* Check pages.
* Fix num_pages for the device.
*/
if ((last < first) || (last >= ambiqmicro_info->num_pages))
return ERROR_FLASH_SECTOR_INVALID;
/*
* Just Mass Erase if all pages are given.
* TODO: Fix num_pages for the device
*/
if ((first == 0) && (last == (ambiqmicro_info->num_pages - 1)))
return ambiqmicro_mass_erase(bank);
/*
* Clear Bootloader bit.
*/
retval = target_write_u32(target, 0x400201a0, 0x0);
CHECK_STATUS(retval, "error clearing bootloader bit.");
/*
* Set up the SRAM.
*/
/*
* Bank.
*/
retval = target_write_u32(target, 0x10000000, bank->bank_number);
CHECK_STATUS(retval, "error writing target SRAM parameters.");
/*
* Number of pages to erase.
*/
retval = target_write_u32(target, 0x10000004, 1 + (last-first));
CHECK_STATUS(retval, "error writing target SRAM parameters.");
/*
* Write Key.
*/
retval = target_write_u32(target, 0x10000008, PROGRAM_KEY);
CHECK_STATUS(retval, "error writing target SRAM parameters.");
/*
* Breakpoint.
*/
retval = target_write_u32(target, 0x1000000c, 0xfffffffe);
CHECK_STATUS(retval, "error writing target SRAM parameters.");
/*
* Pointer to flash address.
*/
retval = target_write_u32(target, 0x10000010, first);
CHECK_STATUS(retval, "error writing target SRAM parameters.");
if (retval != ERROR_OK)
return retval;
/*
* Erase the pages.
*/
LOG_INFO("Erasing pages %u to %u on bank %u", first, last, bank->bank_number);
/*
* passed pc, addr = ROM function, handle breakpoints, not debugging.
*/
retval = ambiqmicro_exec_command(target, FLASH_ERASE_LIST_MAIN_PAGES_FROM_SRAM, 0x1000000C);
CHECK_STATUS(retval, "error executing flash page erase");
if (retval != ERROR_OK)
return retval;
LOG_INFO("%u pages erased!", 1+(last-first));
if (first == 0) {
/*
* Set Bootloader bit.
*/
retval = target_write_u32(target, 0x400201a0, 0x1);
CHECK_STATUS(retval, "error setting bootloader bit.");
if (retval != ERROR_OK)
return retval;
}
return retval;
}
static int ambiqmicro_protect(struct flash_bank *bank, int set,
unsigned int first, unsigned int last)
{
/* struct ambiqmicro_flash_bank *ambiqmicro_info = bank->driver_priv;
* struct target *target = bank->target; */
/*
* TODO
*/
LOG_INFO("Not yet implemented");
if (bank->target->state != TARGET_HALTED) {
LOG_ERROR("Target not halted");
return ERROR_TARGET_NOT_HALTED;
}
return ERROR_OK;
}
static int ambiqmicro_write_block(struct flash_bank *bank,
const uint8_t *buffer, uint32_t offset, uint32_t count)
{
/* struct ambiqmicro_flash_bank *ambiqmicro_info = bank->driver_priv; */
struct target *target = bank->target;
uint32_t address = bank->base + offset;
uint32_t buffer_pointer = 0x10000010;
uint32_t maxbuffer;
uint32_t thisrun_count;
int retval = ERROR_OK;
if (((count%4) != 0) || ((offset%4) != 0)) {
LOG_ERROR("write block must be multiple of 4 bytes in offset & length");
return ERROR_FAIL;
}
/*
* Max buffer size for this device.
* Hard code 6kB for the buffer.
*/
maxbuffer = 0x1800;
LOG_INFO("Flashing main array");
while (count > 0) {
if (count > maxbuffer)
thisrun_count = maxbuffer;
else
thisrun_count = count;
/*
* Set up the SRAM.
*/
/*
* Pointer to flash.
*/
retval = target_write_u32(target, 0x10000000, address);
CHECK_STATUS(retval, "error writing target SRAM parameters.");
/*
* Number of 32-bit words to program.
*/
retval = target_write_u32(target, 0x10000004, thisrun_count/4);
CHECK_STATUS(retval, "error writing target SRAM parameters.");
/*
* Write Key.
*/
retval = target_write_u32(target, 0x10000008, PROGRAM_KEY);
CHECK_STATUS(retval, "error writing target SRAM parameters.");
/*
* Breakpoint.
*/
retval = target_write_u32(target, 0x1000000c, 0xfffffffe);
CHECK_STATUS(retval, "error writing target SRAM parameters.");
/*
* Write Buffer.
*/
retval = target_write_buffer(target, buffer_pointer, thisrun_count, buffer);
if (retval != ERROR_OK) {
CHECK_STATUS(retval, "error writing target SRAM parameters.");
break;
}
LOG_DEBUG("address = 0x%08" PRIx32, address);
retval = ambiqmicro_exec_command(target, FLASH_PROGRAM_MAIN_FROM_SRAM, 0x1000000c);
CHECK_STATUS(retval, "error executing ambiqmicro flash write algorithm");
if (retval != ERROR_OK)
break;
buffer += thisrun_count;
address += thisrun_count;
count -= thisrun_count;
}
LOG_INFO("Main array flashed");
/*
* Clear Bootloader bit.
*/
retval = target_write_u32(target, 0x400201a0, 0x0);
CHECK_STATUS(retval, "error clearing bootloader bit");
return retval;
}
static int ambiqmicro_write(struct flash_bank *bank, const uint8_t *buffer,
uint32_t offset, uint32_t count)
{
int retval;
/* try using a block write */
retval = ambiqmicro_write_block(bank, buffer, offset, count);
if (retval != ERROR_OK)
LOG_ERROR("write failed");
return retval;
}
static int ambiqmicro_probe(struct flash_bank *bank)
{
struct ambiqmicro_flash_bank *ambiqmicro_info = bank->driver_priv;
int retval;
/* If this is a ambiqmicro chip, it has flash; probe() is just
* to figure out how much is present. Only do it once.
*/
if (ambiqmicro_info->probed) {
LOG_INFO("Target already probed");
return ERROR_OK;
}
/* ambiqmicro_read_part_info() already handled error checking and
* reporting. Note that it doesn't write, so we don't care about
* whether the target is halted or not.
*/
retval = ambiqmicro_read_part_info(bank);
if (retval != ERROR_OK)
return retval;
free(bank->sectors);
/* provide this for the benefit of the NOR flash framework */
bank->size = ambiqmicro_info->pagesize * ambiqmicro_info->num_pages;
bank->num_sectors = ambiqmicro_info->num_pages;
bank->sectors = malloc(sizeof(struct flash_sector) * bank->num_sectors);
for (unsigned int i = 0; i < bank->num_sectors; i++) {
bank->sectors[i].offset = i * ambiqmicro_info->pagesize;
bank->sectors[i].size = ambiqmicro_info->pagesize;
bank->sectors[i].is_erased = -1;
bank->sectors[i].is_protected = -1;
}
/*
* Part has been probed.
*/
ambiqmicro_info->probed = true;
return retval;
}
static int ambiqmicro_otp_program(struct flash_bank *bank,
uint32_t offset, uint32_t count)
{
struct target *target = NULL;
struct ambiqmicro_flash_bank *ambiqmicro_info = NULL;
int retval;
ambiqmicro_info = bank->driver_priv;
target = bank->target;
if (target->state != TARGET_HALTED) {
LOG_ERROR("Target not halted");
return ERROR_TARGET_NOT_HALTED;
}
if (!ambiqmicro_info->probed) {
LOG_ERROR("Target not probed");
return ERROR_FLASH_BANK_NOT_PROBED;
}
if (count > 256) {
LOG_ERROR("Count must be < 256");
return ERROR_FLASH_DST_BREAKS_ALIGNMENT;
}
/*
* Clear Bootloader bit.
*/
retval = target_write_u32(target, 0x400201a0, 0x0);
CHECK_STATUS(retval, "error clearing bootloader bit.");
/*
* Set up the SRAM.
*/
/*
* Bank.
*/
retval = target_write_u32(target, 0x10000000, offset);
CHECK_STATUS(retval, "error setting target SRAM parameters.");
/*
* Num of words to program.
*/
retval = target_write_u32(target, 0x10000004, count);
CHECK_STATUS(retval, "error setting target SRAM parameters.");
/*
* Write Key.
*/
retval = target_write_u32(target, 0x10000008, OTP_PROGRAM_KEY);
CHECK_STATUS(retval, "error setting target SRAM parameters.");
/*
* Breakpoint.
*/
retval = target_write_u32(target, 0x1000000c, 0xfffffffe);
CHECK_STATUS(retval, "error setting target SRAM parameters.");
if (retval != ERROR_OK)
return retval;
/*
* Program OTP.
*/
LOG_INFO("Programming OTP offset 0x%08" PRIx32, offset);
/*
* passed pc, addr = ROM function, handle breakpoints, not debugging.
*/
retval = ambiqmicro_exec_command(target, FLASH_PROGRAM_OTP_FROM_SRAM, 0x1000000C);
CHECK_STATUS(retval, "error executing ambiqmicro otp program algorithm");
LOG_INFO("Programming OTP finished.");
return retval;
}
COMMAND_HANDLER(ambiqmicro_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;
if (ambiqmicro_mass_erase(bank) == ERROR_OK)
command_print(CMD, "ambiqmicro mass erase complete");
else
command_print(CMD, "ambiqmicro mass erase failed");
return ERROR_OK;
}
COMMAND_HANDLER(ambiqmicro_handle_page_erase_command)
{
struct flash_bank *bank;
uint32_t first, last;
int retval;
if (CMD_ARGC < 3)
return ERROR_COMMAND_SYNTAX_ERROR;
COMMAND_PARSE_NUMBER(u32, CMD_ARGV[1], first);
COMMAND_PARSE_NUMBER(u32, CMD_ARGV[2], last);
retval = CALL_COMMAND_HANDLER(flash_command_get_bank, 0, &bank);
if (retval != ERROR_OK)
return retval;
if (ambiqmicro_erase(bank, first, last) == ERROR_OK)
command_print(CMD, "ambiqmicro page erase complete");
else
command_print(CMD, "ambiqmicro page erase failed");
return ERROR_OK;
}
/**
* Program the otp block.
*/
COMMAND_HANDLER(ambiqmicro_handle_program_otp_command)
{
struct flash_bank *bank;
uint32_t offset, count;
int retval;
if (CMD_ARGC < 3)
return ERROR_COMMAND_SYNTAX_ERROR;
COMMAND_PARSE_NUMBER(u32, CMD_ARGV[1], offset);
COMMAND_PARSE_NUMBER(u32, CMD_ARGV[2], count);
command_print(CMD, "offset=0x%08" PRIx32 " count=%" PRIu32, offset, count);
CALL_COMMAND_HANDLER(flash_command_get_bank, 0, &bank);
retval = ambiqmicro_otp_program(bank, offset, count);
if (retval != ERROR_OK)
LOG_ERROR("error check log");
return ERROR_OK;
}
static const struct command_registration ambiqmicro_exec_command_handlers[] = {
{
.name = "mass_erase",
.usage = "<bank>",
.handler = ambiqmicro_handle_mass_erase_command,
.mode = COMMAND_EXEC,
.help = "Erase entire device",
},
{
.name = "page_erase",
.usage = "<bank> <first> <last>",
.handler = ambiqmicro_handle_page_erase_command,
.mode = COMMAND_EXEC,
.help = "Erase device pages",
},
{
.name = "program_otp",
.handler = ambiqmicro_handle_program_otp_command,
.mode = COMMAND_EXEC,
.usage = "<bank> <offset> <count>",
.help =
"Program OTP (assumes you have already written array starting at 0x10000010)",
},
COMMAND_REGISTRATION_DONE
};
static const struct command_registration ambiqmicro_command_handlers[] = {
{
.name = "ambiqmicro",
.mode = COMMAND_EXEC,
.help = "ambiqmicro flash command group",
.usage = "Support for Ambiq Micro parts.",
.chain = ambiqmicro_exec_command_handlers,
},
COMMAND_REGISTRATION_DONE
};
const struct flash_driver ambiqmicro_flash = {
.name = "ambiqmicro",
.commands = ambiqmicro_command_handlers,
.flash_bank_command = ambiqmicro_flash_bank_command,
.erase = ambiqmicro_erase,
.protect = ambiqmicro_protect,
.write = ambiqmicro_write,
.read = default_flash_read,
.probe = ambiqmicro_probe,
.auto_probe = ambiqmicro_probe,
.erase_check = default_flash_blank_check,
.protect_check = ambiqmicro_protect_check,
.info = get_ambiqmicro_info,
.free_driver_priv = default_flash_free_driver_priv,
};
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