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/*
* Copyright © 2012 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; version 2 of the License.
*
* 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_storage.h>
/* Total bytes of available storage */
ao_pos_t ao_storage_total = 4096;
/* Block size - device is erased in these units. */
ao_pos_t ao_storage_block = 1024;
/* Byte offset of config block. Will be ao_storage_block bytes long */
ao_pos_t ao_storage_config = 0;
/* Storage unit size - device reads and writes must be within blocks of this size. */
uint16_t ao_storage_unit = 1024;
/* Location of eeprom in address space */
#define stm_eeprom ((uint8_t *) 0x08080000)
/*
* The internal flash chip is arranged in 8 byte sectors; the
* chip cannot erase in units smaller than that.
*
* Writing happens in units of 2 bytes and
* can only change bits from 1 to 0. So, you can rewrite
* the same contents, or append to an existing page easily enough
*/
/*
* Erase the specified sector
*/
uint8_t
ao_storage_erase(ao_pos_t pos) __reentrant
{
/* Not necessary */
return 1;
}
static void
ao_intflash_unlock(void)
{
/* Unlock Data EEPROM and FLASH_PECR register */
stm_flash.pekeyr = STM_FLASH_PEKEYR_PEKEY1;
stm_flash.pekeyr = STM_FLASH_PEKEYR_PEKEY2;
/* Configure the FTDW bit (FLASH_PECR[8]) to execute
* word write, whatever the previous value of the word
* being written to
*/
stm_flash.pecr = ((0 << STM_FLASH_PECR_OBL_LAUNCH) |
(0 << STM_FLASH_PECR_ERRIE) |
(0 << STM_FLASH_PECR_EOPIE) |
(0 << STM_FLASH_PECR_FPRG) |
(0 << STM_FLASH_PECR_ERASE) |
(0 << STM_FLASH_PECR_FTDW) |
(1 << STM_FLASH_PECR_DATA) |
(0 << STM_FLASH_PECR_PROG) |
(0 << STM_FLASH_PECR_OPTLOCK) |
(0 << STM_FLASH_PECR_PRGLOCK) |
(0 << STM_FLASH_PECR_PELOCK));
}
static void
ao_intflash_lock(void)
{
stm_flash.pecr |= (1 << STM_FLASH_PECR_PELOCK);
}
static void
ao_intflash_wait(void)
{
/* Wait for the flash unit to go idle */
while (stm_flash.sr & (1 << STM_FLASH_SR_BSY))
;
}
static void
ao_intflash_write32(uint16_t pos, uint32_t w)
{
volatile uint32_t *addr;
addr = (uint32_t *) (stm_eeprom + pos);
/* Erase previous word */
*addr = 0;
ao_intflash_wait();
if (w) {
/* Write a word to a valid address in the data EEPROM */
*addr = w;
ao_intflash_wait();
}
}
static void
ao_intflash_write8(uint16_t pos, uint8_t d)
{
uint32_t w, *addr, mask;
uint8_t shift;
addr = (uint32_t *) (stm_eeprom + (pos & ~3));
/* Compute word to be written */
shift = (pos & 3) << 3;
mask = 0xff << shift;
w = (*addr & ~mask) | (d << shift);
ao_intflash_write32(pos & ~3, w);
}
static uint8_t
ao_intflash_read(uint16_t pos)
{
return stm_eeprom[pos];
}
/*
* Write to flash
*/
uint8_t
ao_storage_device_write(ao_pos_t pos32, __xdata void *v, uint16_t len) __reentrant
{
uint16_t pos = pos32;
__xdata uint8_t *d = v;
if (pos >= ao_storage_total || pos + len > ao_storage_total)
return 0;
ao_intflash_unlock();
while (len) {
if ((pos & 3) == 0 && len >= 4) {
uint32_t w;
w = d[0] | (d[1] << 8) | (d[2] << 16) | (d[3] << 24);
ao_intflash_write32(pos, w);
pos += 4;
d += 4;
len -= 4;
} else {
ao_intflash_write8(pos, *d);
pos += 1;
d += 1;
len -= 1;
}
}
ao_intflash_lock();
return 1;
}
/*
* Read from flash
*/
uint8_t
ao_storage_device_read(ao_pos_t pos, __xdata void *v, uint16_t len) __reentrant
{
uint8_t *d = v;
if (pos >= ao_storage_total || pos + len > ao_storage_total)
return 0;
while (len--)
*d++ = ao_intflash_read(pos++);
return 1;
}
void
ao_storage_flush(void) __reentrant
{
}
void
ao_storage_setup(void)
{
}
void
ao_storage_device_info(void) __reentrant
{
uint8_t i;
printf ("Using internal flash\n");
}
void
ao_storage_device_init(void)
{
}
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