altos/stm32f1: Start work on self-flash code

Looks like this uses the same IP block as the stm32f0 series; copied
the code, haven't gotten it working yet.

Signed-off-by: Keith Packard <keithp@keithp.com>

diff --git a/src/stm32f1/ao_flash_stm.c b/src/stm32f1/ao_flash_stm.c
new file mode 100644 (file)
index 0000000..0e873d7
--- /dev/null
+++ b/src/stm32f1/ao_flash_stm.c
@@ -0,0 +1,133 @@
+/*
+ * 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        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(".sdata2.flash"), 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 &= ~(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);
+
+       ao_flash_lock();
+       ao_arch_release_interrupts();
+}

diff --git a/src/stm32f1/stm32f1.h b/src/stm32f1/stm32f1.h
index b3b9773617459962b39bd29d53b8e42a2da7f17f..acb3b39ae14733fbc262b23a96592d3b94459c02 100644 (file)
--- a/src/stm32f1/stm32f1.h
+++ b/src/stm32f1/stm32f1.h
@@ -381,9 +381,25 @@ extern struct stm_flash stm_flash;
 #define  STM_FLASH_ACR_LATENCY_1       1
 #define  STM_FLASH_ACR_LATENCY_2       2
 
+#define STM_FLASH_SR_EOP       5
+#define STM_FLASH_SR_WRPRTERR  4
+#define STM_FLASH_SR_PGERR     2
+#define STM_FLASH_SR_BSY       0
+
+#define STM_FLASH_CR_EOPIE     12
+#define STM_FLASH_CR_ERRIE     10
+#define STM_FLASH_CR_OPTWRE    9
+#define STM_FLASH_CR_LOCK      7
+#define STM_FLASH_CR_STRT      6
+#define STM_FLASH_CR_OPTER     5
+#define STM_FLASH_CR_OPTPG     4
+#define STM_FLASH_CR_MER       2
+#define STM_FLASH_CR_PER       1
+#define STM_FLASH_CR_PG                0
+
 #define STM_FLASH_RDPRT_KEY    0x00A5
-#define STM_FLASH_KEY1         0x45670123
-#define STM_FLASH_KEY2         0xCDEF89AB
+#define STM_FLASH_FPEC_KEY1    0x45670123
+#define STM_FLASH_FPEC_KEY2    0xCDEF89AB
 
 
 struct stm_flash_data {