X-Git-Url: https://git.gag.com/?a=blobdiff_plain;f=src%2Fstm32f1%2Fao_flash_stm.c;fp=src%2Fstm32f1%2Fao_flash_stm.c;h=1e35545cffa5783c3478c6286473546edf55fe55;hb=c2b775a6cd8888f98f086b4b730edb31bb846f91;hp=0000000000000000000000000000000000000000;hpb=f856f20b31c542caeb5decbf3546c6a0242ab33d;p=fw%2Faltos

diff --git a/src/stm32f1/ao_flash_stm.c b/src/stm32f1/ao_flash_stm.c
new file mode 100644
index 00000000..1e35545c
--- /dev/null
+++ b/src/stm32f1/ao_flash_stm.c
@@ -0,0 +1,149 @@
+/*
+ * Copyright © 2023 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>
+
+/* 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);
+}
+
+#define ao_flash_wait_bsy() do { while (stm_flash.sr & (1 << STM_FLASH_SR_BSY)); } while (0)
+
+static void __attribute__ ((section(".sdata2.flash"), 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 &= ~(1UL << STM_FLASH_CR_PER);
+}
+
+static uint32_t
+stm_flash_page_size(void)
+{
+	uint16_t	f_size = stm_flash_data.f_size;
+
+	if (f_size <= 128) {
+		/* low-density and medium-density devices */
+		return 1024;
+	} else {
+		/*
+		 * high-density devices, XL-density devices and
+		 * Connectivity devices
+		 */
+		return 2048;
+	}
+}
+
+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(".sdata2.flash"), noinline))
+_ao_flash_page(uint16_t *dst, uint16_t *src, unsigned int shorts)
+{
+	uint8_t		i;
+
+	stm_flash.cr |= (1 << STM_FLASH_CR_PG);
+
+	for (i = 0; i < shorts; i++) {
+		*dst++ = *src++;
+		ao_flash_wait_bsy();
+	}
+
+	stm_flash.cr &= ~(1UL << 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, 128);
+
+	ao_flash_lock();
+	ao_arch_release_interrupts();
+}
+
+/* Stores less than a full page while still smashing the full page */
+void
+ao_flash_bytes(void *page, void *src, size_t size)
+{
+	unsigned int shorts = (unsigned int) ((size + 1) >> 1);
+
+	ao_flash_erase_page(page);
+
+	ao_arch_block_interrupts();
+	ao_flash_unlock();
+
+	_ao_flash_page((uint16_t *) page, (uint16_t *) src, shorts);
+
+	ao_flash_lock();
+	ao_arch_release_interrupts();
+}