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-rw-r--r--contrib/loaders/flash/stm32f1x.S (renamed from contrib/loaders/flash/stm32x.S)71
-rw-r--r--src/flash/nor/stm32f1x.c210
2 files changed, 201 insertions, 80 deletions
diff --git a/contrib/loaders/flash/stm32x.S b/contrib/loaders/flash/stm32f1x.S
index 01494b86..125c76a6 100644
--- a/contrib/loaders/flash/stm32x.S
+++ b/contrib/loaders/flash/stm32f1x.S
@@ -1,6 +1,6 @@
/***************************************************************************
- * Copyright (C) 2010 by Spencer Oliver *
- * spen@spen-soft.co.uk *
+ * Copyright (C) 2011 by Andreas Fritiofson *
+ * andreas.fritiofson@gmail.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 *
@@ -25,34 +25,47 @@
.thumb_func
.global write
-/*
- r0 - source address
- r1 - target address
- r2 - count (halfword-16bit)
- r3 - sector offet in : result out
- r4 - flash base
-*/
+ /* Params:
+ * r0 - flash base (in), status (out)
+ * r1 - count (halfword-16bit)
+ * r2 - workarea start
+ * r3 - workarea end
+ * r4 - target address
+ * Clobbered:
+ * r5 - rp
+ * r6 - wp, tmp
+ */
-#define STM32_FLASH_CR_OFFSET 0x10 /* offset of CR register in FLASH struct */
-#define STM32_FLASH_SR_OFFSET 0x0c /* offset of CR register in FLASH struct */
+#define STM32_FLASH_CR_OFFSET 0x10 /* offset of CR register from flash reg base */
+#define STM32_FLASH_SR_OFFSET 0x0c /* offset of SR register from flash reg base */
-write:
- ldr r4, STM32_FLASH_BASE
- add r4, r3 /* add offset 0x00 for sector 0 : 0x40 for sector 1 */
-write_half_word:
- movs r3, #0x01
- str r3, [r4, #STM32_FLASH_CR_OFFSET] /* PG (bit0) == 1 => flash programming enabled */
- ldrh r3, [r0], #0x02 /* read one half-word from src, increment ptr */
- strh r3, [r1], #0x02 /* write one half-word from src, increment ptr */
+wait_fifo:
+ ldr r6, [r2, #0] /* read wp */
+ cmp r6, #0 /* abort if wp == 0 */
+ beq exit
+ ldr r5, [r2, #4] /* read rp */
+ cmp r5, r6 /* wait until rp != wp */
+ beq wait_fifo
+ movs r6, #1 /* set PG flag to enable flash programming */
+ str r6, [r0, #STM32_FLASH_CR_OFFSET]
+ ldrh r6, [r5], #2 /* "*target_address++ = *rp++" */
+ strh r6, [r4], #2
busy:
- ldr r3, [r4, #STM32_FLASH_SR_OFFSET]
- tst r3, #0x01 /* BSY (bit0) == 1 => operation in progress */
- beq busy /* wait more... */
- tst r3, #0x14 /* PGERR (bit2) == 1 or WRPRTERR (bit4) == 1 => error */
- bne exit /* fail... */
- subs r2, r2, #0x01 /* decrement counter */
- bne write_half_word /* write next half-word if anything left */
+ ldr r6, [r0, #STM32_FLASH_SR_OFFSET] /* wait until BSY flag is reset */
+ tst r6, #1
+ bne busy
+ tst r6, #0x14 /* check the error bits */
+ bne error
+ cmp r5, r3 /* wrap rp at end of buffer */
+ it cs
+ addcs r5, r2, #8
+ str r5, [r2, #4] /* store rp */
+ subs r1, r1, #1 /* decrement halfword count */
+ cbz r1, exit /* loop if not done */
+ b wait_fifo
+error:
+ movs r0, #0
+ str r0, [r2, #2] /* set rp = 0 on error */
exit:
- bkpt #0x00
-
-STM32_FLASH_BASE: .word 0x40022000 /* base address of FLASH struct */
+ mov r0, r6 /* return status in r0 */
+ bkpt #0
diff --git a/src/flash/nor/stm32f1x.c b/src/flash/nor/stm32f1x.c
index 142b03e8..a0520c79 100644
--- a/src/flash/nor/stm32f1x.c
+++ b/src/flash/nor/stm32f1x.c
@@ -5,6 +5,9 @@
* Copyright (C) 2008 by Spencer Oliver *
* spen@spen-soft.co.uk *
* *
+ * Copyright (C) 2011 by Andreas Fritiofson *
+ * andreas.fritiofson@gmail.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 *
@@ -623,34 +626,45 @@ static int stm32x_write_block(struct flash_bank *bank, uint8_t *buffer,
uint32_t buffer_size = 16384;
struct working_area *source;
uint32_t address = bank->base + offset;
- struct reg_param reg_params[4];
+ struct reg_param reg_params[5];
struct armv7m_algorithm armv7m_info;
int retval = ERROR_OK;
- /* see contib/loaders/flash/stm32x.s for src */
+ /* see contrib/loaders/flash/stm32f1x.S for src */
static const uint8_t stm32x_flash_write_code[] = {
- /* #define STM32_FLASH_CR_OFFSET 0x10 */
- /* #define STM32_FLASH_SR_OFFSET 0x0C */
- /* write: */
- 0x08, 0x4c, /* ldr r4, STM32_FLASH_BASE */
- 0x1c, 0x44, /* add r4, r3 */
- /* write_half_word: */
- 0x01, 0x23, /* movs r3, #0x01 */
- 0x23, 0x61, /* str r3, [r4, #STM32_FLASH_CR_OFFSET] */
- 0x30, 0xf8, 0x02, 0x3b, /* ldrh r3, [r0], #0x02 */
- 0x21, 0xf8, 0x02, 0x3b, /* strh r3, [r1], #0x02 */
- /* busy: */
- 0xe3, 0x68, /* ldr r3, [r4, #STM32_FLASH_SR_OFFSET] */
- 0x13, 0xf0, 0x01, 0x0f, /* tst r3, #0x01 */
- 0xfb, 0xd0, /* beq busy */
- 0x13, 0xf0, 0x14, 0x0f, /* tst r3, #0x14 */
- 0x01, 0xd1, /* bne exit */
- 0x01, 0x3a, /* subs r2, r2, #0x01 */
- 0xf0, 0xd1, /* bne write_half_word */
- /* exit: */
- 0x00, 0xbe, /* bkpt #0x00 */
- 0x00, 0x20, 0x02, 0x40, /* STM32_FLASH_BASE: .word 0x40022000 */
+ /* #define STM32_FLASH_CR_OFFSET 0x10 */
+ /* #define STM32_FLASH_SR_OFFSET 0x0C */
+ /* wait_fifo: */
+ 0x16, 0x68, /* ldr r6, [r2, #0] */
+ 0x00, 0x2e, /* cmp r6, #0 */
+ 0x1a, 0xd0, /* beq exit */
+ 0x55, 0x68, /* ldr r5, [r2, #4] */
+ 0xb5, 0x42, /* cmp r5, r6 */
+ 0xf9, 0xd0, /* beq wait_fifo */
+ 0x01, 0x26, /* movs r6, #1 */
+ 0x06, 0x61, /* str r6, [r0, #STM32_FLASH_CR_OFFSET] */
+ 0x35, 0xf8, 0x02, 0x6b, /* ldrh r6, [r5], #2 */
+ 0x24, 0xf8, 0x02, 0x6b, /* strh r6, [r4], #2 */
+ /* busy: */
+ 0xc6, 0x68, /* ldr r6, [r0, #STM32_FLASH_SR_OFFSET] */
+ 0x16, 0xf0, 0x01, 0x0f, /* tst r6, #1 */
+ 0xfb, 0xd1, /* bne busy */
+ 0x16, 0xf0, 0x14, 0x0f, /* tst r6, #0x14 */
+ 0x07, 0xd1, /* bne error */
+ 0x9d, 0x42, /* cmp r5, r3 */
+ 0x28, 0xbf, /* it cs */
+ 0x02, 0xf1, 0x08, 0x05, /* addcs r5, r2, #8 */
+ 0x55, 0x60, /* str r5, [r2, #4] */
+ 0x01, 0x39, /* subs r1, r1, #1 */
+ 0x19, 0xb1, /* cbz r1, exit */
+ 0xe4, 0xe7, /* b wait_fifo */
+ /* error: */
+ 0x00, 0x20, /* movs r0, #0 */
+ 0xc2, 0xf8, 0x02, 0x00, /* str r0, [r2, #2] */
+ /* exit: */
+ 0x30, 0x46, /* mov r0, r6 */
+ 0x00, 0xbe, /* bkpt #0 */
};
/* flash write code */
@@ -670,6 +684,7 @@ static int stm32x_write_block(struct flash_bank *bank, uint8_t *buffer,
while (target_alloc_working_area_try(target, buffer_size, &source) != ERROR_OK)
{
buffer_size /= 2;
+ buffer_size &= ~3UL; // Make sure it's 4 byte aligned
if (buffer_size <= 256)
{
/* if we already allocated the writing code, but failed to get a
@@ -682,60 +697,152 @@ static int stm32x_write_block(struct flash_bank *bank, uint8_t *buffer,
}
};
+ /* Set up working area. First word is write pointer, second word is read pointer,
+ * rest is fifo data area. */
+ uint32_t wp_addr = source->address;
+ uint32_t rp_addr = source->address + 4;
+ uint32_t fifo_start_addr = source->address + 8;
+ uint32_t fifo_end_addr = source->address + source->size;
+
+ uint32_t wp = fifo_start_addr;
+ uint32_t rp = fifo_start_addr;
+
+ retval = target_write_u32(target, wp_addr, wp);
+ if (retval != ERROR_OK)
+ return retval;
+ retval = target_write_u32(target, rp_addr, rp);
+ if (retval != ERROR_OK)
+ return retval;
+
+ init_reg_param(&reg_params[0], "r0", 32, PARAM_IN_OUT); /* flash base (in), status (out) */
+ init_reg_param(&reg_params[1], "r1", 32, PARAM_OUT); /* count (halfword-16bit) */
+ init_reg_param(&reg_params[2], "r2", 32, PARAM_OUT); /* buffer start */
+ init_reg_param(&reg_params[3], "r3", 32, PARAM_OUT); /* buffer end */
+ init_reg_param(&reg_params[4], "r4", 32, PARAM_IN_OUT); /* target address */
+
+ buf_set_u32(reg_params[0].value, 0, 32, stm32x_info->register_base);
+ buf_set_u32(reg_params[1].value, 0, 32, count);
+ buf_set_u32(reg_params[2].value, 0, 32, source->address);
+ buf_set_u32(reg_params[3].value, 0, 32, source->address + source->size);
+ buf_set_u32(reg_params[4].value, 0, 32, address);
+
armv7m_info.common_magic = ARMV7M_COMMON_MAGIC;
armv7m_info.core_mode = ARMV7M_MODE_ANY;
- init_reg_param(&reg_params[0], "r0", 32, PARAM_OUT);
- init_reg_param(&reg_params[1], "r1", 32, PARAM_OUT);
- init_reg_param(&reg_params[2], "r2", 32, PARAM_OUT);
- init_reg_param(&reg_params[3], "r3", 32, PARAM_IN_OUT);
+ /* Start up algorithm on target and let it idle while writing the first chunk */
+ if ((retval = target_start_algorithm(target, 0, NULL, 5, reg_params,
+ stm32x_info->write_algorithm->address,
+ 0,
+ &armv7m_info)) != ERROR_OK)
+ {
+ LOG_ERROR("error starting stm32x flash write algorithm");
+ goto cleanup;
+ }
while (count > 0)
{
- uint32_t thisrun_count = (count > (buffer_size / 2)) ?
- (buffer_size / 2) : count;
-
- if ((retval = target_write_buffer(target, source->address,
- thisrun_count * 2, buffer)) != ERROR_OK)
+ retval = target_read_u32(target, rp_addr, &rp);
+ if (retval != ERROR_OK)
+ {
+ LOG_ERROR("failed to get read pointer");
break;
+ }
- buf_set_u32(reg_params[0].value, 0, 32, source->address);
- buf_set_u32(reg_params[1].value, 0, 32, address);
- buf_set_u32(reg_params[2].value, 0, 32, thisrun_count);
- buf_set_u32(reg_params[3].value, 0, 32, stm32x_info->register_base - FLASH_REG_BASE_B0);
+ LOG_DEBUG("count 0x%"PRIx32" wp 0x%"PRIx32" rp 0x%"PRIx32, count, wp, rp);
- if ((retval = target_run_algorithm(target, 0, NULL, 4, reg_params,
- stm32x_info->write_algorithm->address,
- 0,
- 10000, &armv7m_info)) != ERROR_OK)
+ if (rp == 0)
{
- LOG_ERROR("error executing stm32x flash write algorithm");
+ LOG_ERROR("flash write algorithm aborted by target");
+ retval = ERROR_FLASH_OPERATION_FAILED;
break;
}
- if (buf_get_u32(reg_params[3].value, 0, 32) & FLASH_PGERR)
+ if ((rp & 1) || rp < fifo_start_addr || rp >= fifo_end_addr)
+ {
+ LOG_ERROR("corrupted fifo read pointer 0x%"PRIx32, rp);
+ break;
+ }
+
+ /* Count the number of bytes available in the fifo without
+ * crossing the wrap around. Make sure to not fill it completely,
+ * because that would make wp == rp and that's the empty condition. */
+ uint32_t thisrun_bytes;
+ if (rp > wp)
+ thisrun_bytes = rp - wp - 2;
+ else if (rp > fifo_start_addr)
+ thisrun_bytes = fifo_end_addr - wp;
+ else
+ thisrun_bytes = fifo_end_addr - wp - 2;
+
+ if (thisrun_bytes == 0)
+ {
+ /* Throttle polling a bit if transfer is (much) faster than flash
+ * programming. The exact delay shouldn't matter as long as it's
+ * less than buffer size / flash speed. This is very unlikely to
+ * run when using high latency connections such as USB. */
+ alive_sleep(10);
+ continue;
+ }
+
+ /* Limit to the amount of data we actually want to write */
+ if (thisrun_bytes > count * 2)
+ thisrun_bytes = count * 2;
+
+ /* Write data to fifo */
+ retval = target_write_buffer(target, wp, thisrun_bytes, buffer);
+ if (retval != ERROR_OK)
+ break;
+
+ /* Update counters and wrap write pointer */
+ buffer += thisrun_bytes;
+ count -= thisrun_bytes / 2;
+ wp += thisrun_bytes;
+ if (wp >= fifo_end_addr)
+ wp = fifo_start_addr;
+
+ /* Store updated write pointer to target */
+ retval = target_write_u32(target, wp_addr, wp);
+ if (retval != ERROR_OK)
+ break;
+ }
+
+ if (retval != ERROR_OK)
+ {
+ /* abort flash write algorithm on target */
+ target_write_u32(target, wp_addr, 0);
+ }
+
+ int retval2;
+ if ((retval2 = target_wait_algorithm(target, 0, NULL, 5, reg_params,
+ 0,
+ 10000,
+ &armv7m_info)) != ERROR_OK)
+ {
+ LOG_ERROR("error waiting for stm32x flash write algorithm");
+ retval = retval2;
+ }
+
+ if (retval == ERROR_FLASH_OPERATION_FAILED)
+ {
+ LOG_ERROR("flash write failed at address 0x%"PRIx32,
+ buf_get_u32(reg_params[4].value, 0, 32));
+
+ if (buf_get_u32(reg_params[0].value, 0, 32) & FLASH_PGERR)
{
LOG_ERROR("flash memory not erased before writing");
/* Clear but report errors */
target_write_u32(target, STM32_FLASH_SR_B0, FLASH_PGERR);
- retval = ERROR_FAIL;
- break;
}
- if (buf_get_u32(reg_params[3].value, 0, 32) & FLASH_WRPRTERR)
+ if (buf_get_u32(reg_params[0].value, 0, 32) & FLASH_WRPRTERR)
{
LOG_ERROR("flash memory write protected");
/* Clear but report errors */
target_write_u32(target, STM32_FLASH_SR_B0, FLASH_WRPRTERR);
- retval = ERROR_FAIL;
- break;
}
-
- buffer += thisrun_count * 2;
- address += thisrun_count * 2;
- count -= thisrun_count;
}
+cleanup:
target_free_working_area(target, source);
target_free_working_area(target, stm32x_info->write_algorithm);
@@ -743,6 +850,7 @@ static int stm32x_write_block(struct flash_bank *bank, uint8_t *buffer,
destroy_reg_param(&reg_params[1]);
destroy_reg_param(&reg_params[2]);
destroy_reg_param(&reg_params[3]);
+ destroy_reg_param(&reg_params[4]);
return retval;
}
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