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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_is_locked(void)
{
return (stm_flash.cr & (1 << STM_FLASH_CR_LOCK)) != 0;
}
static void
ao_flash_unlock(void)
{
if (!ao_flash_is_locked())
return;
/* Unlock FLASH_CR register */
stm_flash.keyr = STM_FLASH_KEYR_KEY1;
stm_flash.keyr = STM_FLASH_KEYR_KEY2;
if (ao_flash_is_locked())
ao_panic(AO_PANIC_FLASH);
}
static void
ao_flash_lock(void)
{
stm_flash.cr |= (1 << STM_FLASH_CR_LOCK);
}
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.cr |= (1 << STM_FLASH_CR_PER);
stm_flash.ar = (uintptr_t) page;
stm_flash.cr |= (1 << STM_FLASH_CR_STRT);
ao_flash_wait_bsy();
stm_flash.cr &= ~(1 << STM_FLASH_CR_PER);
}
static uint32_t
stm_flash_page_size(void)
{
uint16_t dev_id = stm_dev_id();
switch (dev_id) {
case 0x440: /* stm32f05x */
case 0x444: /* stm32f03x */
case 0x445: /* stm32f04x */
return 1024;
case 0x442: /* stm32f09x */
case 0x448: /* stm32f07x */
return 2048;
}
ao_panic(AO_PANIC_FLASH);
return 0;
}
void
ao_flash_erase_page(uint32_t *page)
{
/* Erase the whole page at the start. This assumes we'll be flashing things
* in memory order
*/
if ((uintptr_t) page & (stm_flash_page_size() - 1))
return;
ao_arch_block_interrupts();
ao_flash_unlock();
_ao_flash_erase_page(page);
ao_flash_lock();
ao_arch_release_interrupts();
}
static void __attribute__ ((section(".ramtext"), noinline))
_ao_flash_page(uint16_t *dst, uint16_t *src)
{
uint8_t i;
stm_flash.cr |= (1 << STM_FLASH_CR_PG);
for (i = 0; i < 128; i++) {
*dst++ = *src++;
ao_flash_wait_bsy();
}
stm_flash.cr &= ~(1 << STM_FLASH_CR_PG);
}
void
ao_flash_page(uint32_t *page, uint32_t *src)
{
ao_flash_erase_page(page);
ao_arch_block_interrupts();
ao_flash_unlock();
_ao_flash_page((uint16_t *) page, (uint16_t *) src);
ao_flash_lock();
ao_arch_release_interrupts();
}
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