topic: STM32W support added to em357 driver

The em357 driver only supported one page configuration (192k in 96 2048k)
pages. This is fine for em357 chips since that's the size they have, but
ST's STM32W chips (pretty much the same) have different flash
configurations available (64, 128, 192, 256k). I can't find anywhere
that would indicate the size of the chip anywhere in memory so the
selection must be manual, using the 'size' parameter. For backwards
compatibility, any size not known to be in use defaults to the 192k
configuration. I don't have any em357 devices to test, but I also found
that I had to re-assert the FPEC clock enable before performing an
erase. This is a single line and shouldn't break any configurations.

My testing so far has only been with a 64k device with 8k of RAM.

Change-Id: Ic0ac400a9696efaa09d1407dd4a4d456bc2c318b
Signed-off-by: Ben Nahill <bnahill@gmail.com>
Reviewed-on: http://openocd.zylin.com/1336
Tested-by: jenkins
Reviewed-by: Peter Stuge <peter@stuge.se>

1 files changed, 36 insertions, 3 deletions

diff --git a/src/flash/nor/em357.c b/src/flash/nor/em357.c
index cbb71fc..664306c 100644
--- a/src/flash/nor/em357.c
+++ b/src/flash/nor/em357.c
@@ -358,6 +358,9 @@ static int em357_erase(struct flash_bank *bank, int first, int last)
 	if ((first == 0) && (last == (bank->num_sectors - 1)))
 		return em357_mass_erase(bank);
 
+	/* Enable FPEC clock */
+	target_write_u32(target, EM357_FPEC_CLK, 0x00000001);
+
 	/* unlock flash registers */
 	int retval = target_write_u32(target, EM357_FLASH_KEYR, KEY1);
 	if (retval != ERROR_OK)
@@ -519,7 +522,6 @@ static int em357_write_block(struct flash_bank *bank, uint8_t *buffer,
 			return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
 		}
 	}
-	;
 
 	armv7m_info.common_magic = ARMV7M_COMMON_MAGIC;
 	armv7m_info.core_mode = ARM_MODE_THREAD;
@@ -609,6 +611,8 @@ static int em357_write(struct flash_bank *bank, uint8_t *buffer,
 	if (retval != ERROR_OK)
 		return retval;
 
+	target_write_u32(target, EM357_FPEC_CLK, 0x00000001);
+
 	/* multiple half words (2-byte) to be programmed? */
 	if (words_remaining > 0) {
 		/* try using a block write */
@@ -680,14 +684,40 @@ static int em357_probe(struct flash_bank *bank)
 
 	em357_info->probed = 0;
 
+	switch (bank->size) {
+		case 0x10000:
+			/* 64k -- 64 1k pages */
+			num_pages = 64;
+			page_size = 1024;
+			break;
+		case 0x20000:
+			/* 128k -- 128 1k pages */
+			num_pages = 128;
+			page_size = 1024;
+			break;
+		case 0x30000:
+			/* 192k -- 96 2k pages */
+			num_pages = 96;
+			page_size = 2048;
+			break;
+		case 0x40000:
+			/* 256k -- 128 2k pages */
+			num_pages = 128;
+			page_size = 2048;
+			break;
+		default:
+			LOG_WARNING("No size specified for em357 flash driver, assuming 192k!");
+			num_pages = 96;
+			page_size = 2048;
+			break;
+	}
+
 	/* Enable FPEC CLK */
 	int retval = target_write_u32(target, EM357_FPEC_CLK, 0x00000001);
 	if (retval != ERROR_OK)
 		return retval;
 
-	page_size = 2048;
 	em357_info->ppage_size = 4;
-	num_pages = 96;
 
 	LOG_INFO("flash size = %dkbytes", num_pages*page_size/1024);
 
@@ -813,6 +843,9 @@ static int em357_mass_erase(struct flash_bank *bank)
 		return ERROR_TARGET_NOT_HALTED;
 	}
 
+	/* Make sure the flash clock is on */
+	target_write_u32(target, EM357_FPEC_CLK, 0x00000001);
+
 	/* unlock option flash registers */
 	int retval = target_write_u32(target, EM357_FLASH_KEYR, KEY1);
 	if (retval != ERROR_OK)