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/*
* Copyright © 2017 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.
*/
#include <ao.h>
#include <ao_storage.h>
uint32_t ao_storage_block;
ao_pos_t ao_storage_total;
uint16_t ao_storage_unit;
/* Note that the HSI clock must be running for this code to work.
* Also, special care must be taken with the linker to ensure that the
* functions marked 'ramtext' land in ram and not rom. An example of that
* can be found in altos-loader.ld
*/
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 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;
}
#define ao_flash_wait_bsy() do { while (stm_flash.sr & (1 << STM_FLASH_SR_BSY)); } while (0)
static void __attribute__ ((section(".ramtext"),noinline))
_ao_flash_erase_page(uint16_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);
}
#define _ao_flash_addr(pos) ((uint16_t *) (void *) ((uint8_t *) __flash__ + (pos)))
static void __attribute ((section(".ramtext"), noinline)) _ao_flash_byte(uint32_t pos, uint8_t b)
{
uint16_t v;
uint16_t *a = _ao_flash_addr(pos & ~1);
if (pos & 1)
v = (*a & 0xff) | (b << 8);
else
v = (*a & 0xff00) | b;
*a = v;
ao_flash_wait_bsy();
}
static void __attribute__ ((section(".ramtext"), noinline))
_ao_flash_write(uint32_t pos, void *sv, uint16_t len)
{
uint8_t *s = sv;
uint16_t *f16;
uint16_t v;
stm_flash.cr |= (1 << STM_FLASH_CR_PG);
if (pos & 1) {
_ao_flash_byte(pos++, *s++);
len--;
}
f16 = _ao_flash_addr(pos);
while(len > 1) {
v = s[0] | (s[1] << 8);
s += 2;
*f16++ = v;
ao_flash_wait_bsy();
len -= 2;
pos += 2;
}
if (len)
_ao_flash_byte(pos, *s++);
stm_flash.cr &= ~(1 << STM_FLASH_CR_PG);
}
static bool
ao_storage_is_erased(uint32_t pos)
{
uint16_t *flash = _ao_flash_addr(pos);
uint32_t i = ao_storage_block >> 1;
while (i--)
if (*flash++ != 0xffff)
return false;
return true;
}
uint8_t
ao_storage_erase(uint32_t pos)
{
if (ao_storage_is_erased(pos))
return 1;
ao_arch_block_interrupts();
ao_flash_unlock();
_ao_flash_erase_page(_ao_flash_addr(pos));
ao_flash_lock();
ao_arch_release_interrupts();
return 1;
}
uint8_t
ao_storage_device_write(uint32_t pos, void *v, uint16_t len)
{
if (len == 0)
return 1;
ao_arch_block_interrupts();
ao_flash_unlock();
_ao_flash_write(pos, v, len);
ao_flash_lock();
ao_arch_release_interrupts();
return 1;
}
uint8_t
ao_storage_device_read(uint32_t pos, void *d, uint16_t len)
{
if (pos >= ao_storage_total || pos + len > ao_storage_total)
return 0;
memcpy(d, _ao_flash_addr(pos), len);
return 1;
}
void
ao_storage_flush(void)
{
}
void
ao_storage_setup(void)
{
ao_storage_block = stm_flash_page_size();
ao_storage_total = ((uint8_t *) __flash_end__) - ((uint8_t *) __flash__);
ao_storage_unit = ao_storage_total;
}
void
ao_storage_device_info(void)
{
printf ("Using internal flash, page %d bytes, total %d bytes\n",
ao_storage_block, ao_storage_total);
}
void
ao_storage_device_init(void)
{
}
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