--- /dev/null
+/*
+ * 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; 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_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();
+}