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/*
* Copyright © 2013 Keith Packard <keithp@keithp.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#include <ao.h>
#include <ao_flash.h>
static uint8_t
ao_flash_pecr_is_locked(void)
{
return (stm_flash.pecr & (1 << STM_FLASH_PECR_PELOCK)) != 0;
}
static uint8_t
ao_flash_pgr_is_locked(void)
{
return (stm_flash.pecr & (1 << STM_FLASH_PECR_PRGLOCK)) != 0;
}
static void
ao_flash_pecr_unlock(void)
{
if (!ao_flash_pecr_is_locked())
return;
/* Unlock Data EEPROM and FLASH_PECR register */
stm_flash.pekeyr = STM_FLASH_PEKEYR_PEKEY1;
stm_flash.pekeyr = STM_FLASH_PEKEYR_PEKEY2;
if (ao_flash_pecr_is_locked())
ao_panic(AO_PANIC_FLASH);
}
static void
ao_flash_pgr_unlock(void)
{
if (!ao_flash_pgr_is_locked())
return;
/* Unlock program memory */
stm_flash.prgkeyr = STM_FLASH_PRGKEYR_PRGKEY1;
stm_flash.prgkeyr = STM_FLASH_PRGKEYR_PRGKEY2;
if (ao_flash_pgr_is_locked())
ao_panic(AO_PANIC_FLASH);
}
static void
ao_flash_lock(void)
{
stm_flash.pecr |= (1 << STM_FLASH_PECR_OPTLOCK) | (1 << STM_FLASH_PECR_PRGLOCK) | (1 << STM_FLASH_PECR_PELOCK);
}
static void
ao_flash_wait_bsy(void)
{
while (stm_flash.sr & (1 << STM_FLASH_SR_BSY))
;
}
static void __attribute__ ((section(".ramtext"),noinline))
_ao_flash_erase_page(uint32_t *page)
{
stm_flash.pecr |= (1 << STM_FLASH_PECR_ERASE) | (1 << STM_FLASH_PECR_PROG);
*page = 0x00000000;
ao_flash_wait_bsy();
}
void
ao_flash_erase_page(uint32_t *page)
{
ao_arch_block_interrupts();
ao_flash_pecr_unlock();
ao_flash_pgr_unlock();
_ao_flash_erase_page(page);
ao_flash_lock();
ao_arch_release_interrupts();
}
static void __attribute__ ((section(".ramtext"), noinline))
_ao_flash_half_page(uint32_t *dst, uint32_t *src)
{
uint8_t i;
stm_flash.pecr |= (1 << STM_FLASH_PECR_FPRG);
stm_flash.pecr |= (1 << STM_FLASH_PECR_PROG);
ao_flash_wait_bsy();
for (i = 0; i < 32; i++) {
*dst++ = *src++;
}
while (stm_flash.sr & (1 << STM_FLASH_SR_BSY))
;
}
void
ao_flash_page(uint32_t *page, uint32_t *src)
{
uint8_t h;
ao_flash_erase_page(page);
ao_arch_block_interrupts();
ao_flash_pecr_unlock();
ao_flash_pgr_unlock();
for (h = 0; h < 2; h++) {
_ao_flash_half_page(page, src);
page += 32;
src += 32;
}
ao_flash_lock();
ao_arch_release_interrupts();
}
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