1 files changed, 276 insertions, 0 deletions

diff --git a/src/flash/nor/core.c b/src/flash/nor/core.c
index a69c3f49..2dbf1142 100644
--- a/src/flash/nor/core.c
+++ b/src/flash/nor/core.c
@@ -22,6 +22,7 @@
 #endif
 #include <flash/flash.h>
 #include <flash/nor/imp.h>
+#include <target/image.h>
 
 // in flash.c, to be moved here
 extern struct flash_driver *flash_drivers[];
@@ -37,6 +38,48 @@ struct flash_driver *flash_driver_find_by_name(const char *name)
 	return NULL;
 }
 
+int flash_driver_erase(struct flash_bank *bank, int first, int last)
+{
+	int retval;
+
+	retval = bank->driver->erase(bank, first, last);
+	if (retval != ERROR_OK)
+	{
+		LOG_ERROR("failed erasing sectors %d to %d (%d)", first, last, retval);
+	}
+
+	return retval;
+}
+
+int flash_driver_protect(struct flash_bank *bank, int set, int first, int last)
+{
+	int retval;
+
+	retval = bank->driver->protect(bank, set, first, last);
+	if (retval != ERROR_OK)
+	{
+		LOG_ERROR("failed setting protection for areas %d to %d (%d)", first, last, retval);
+	}
+
+	return retval;
+}
+
+int flash_driver_write(struct flash_bank *bank,
+		uint8_t *buffer, uint32_t offset, uint32_t count)
+{
+	int retval;
+
+	retval = bank->driver->write(bank, buffer, offset, count);
+	if (retval != ERROR_OK)
+	{
+		LOG_ERROR("error writing to flash at address 0x%08" PRIx32 " at offset 0x%8.8" PRIx32 " (%d)",
+			  bank->base, offset, retval);
+	}
+
+	return retval;
+}
+
+
 void flash_bank_add(struct flash_bank *bank)
 {
 	/* put flash bank in linked list */
@@ -63,3 +106,236 @@ struct flash_bank *flash_bank_list(void)
 {
 	return flash_banks;
 }
+
+/* erase given flash region, selects proper bank according to target and address */
+static int flash_iterate_address_range(struct target *target, uint32_t addr, uint32_t length,
+		int (*callback)(struct flash_bank *bank, int first, int last))
+{
+	struct flash_bank *c;
+	int first = -1;
+	int last = -1;
+	int i;
+
+	if ((c = get_flash_bank_by_addr(target, addr)) == NULL)
+		return ERROR_FLASH_DST_OUT_OF_BANK; /* no corresponding bank found */
+
+	if (c->size == 0 || c->num_sectors == 0)
+	{
+		LOG_ERROR("Bank is invalid");
+		return ERROR_FLASH_BANK_INVALID;
+	}
+
+	if (length == 0)
+	{
+		/* special case, erase whole bank when length is zero */
+		if (addr != c->base)
+			return ERROR_FLASH_DST_BREAKS_ALIGNMENT;
+
+		return callback(c, 0, c->num_sectors - 1);
+	}
+
+	/* check whether it fits */
+	if (addr + length - 1 > c->base + c->size - 1)
+		return ERROR_FLASH_DST_BREAKS_ALIGNMENT;
+
+	addr -= c->base;
+
+	for (i = 0; i < c->num_sectors; i++)
+	{
+		/* check whether sector overlaps with the given range and is not yet erased */
+		if (addr < c->sectors[i].offset + c->sectors[i].size && addr + length > c->sectors[i].offset && c->sectors[i].is_erased != 1) {
+			/* if first is not set yet then this is the first sector */
+			if (first == -1)
+				first = i;
+			last = i; /* and it is the last one so far in any case */
+		}
+	}
+
+	if (first == -1 || last == -1)
+		return ERROR_OK;
+
+	return callback(c, first, last);
+}
+
+int flash_erase_address_range(struct target *target, uint32_t addr, uint32_t length)
+{
+	return flash_iterate_address_range(target,
+			addr, length, &flash_driver_erase);
+}
+
+static int flash_driver_unprotect(struct flash_bank *bank, int first, int last)
+{
+	return flash_driver_protect(bank, 0, first, last);
+}
+
+static int flash_unlock_address_range(struct target *target, uint32_t addr, uint32_t length)
+{
+	return flash_iterate_address_range(target,
+			addr, length, &flash_driver_unprotect);
+}
+
+int flash_write_unlock(struct target *target, struct image *image,
+		uint32_t *written, int erase, bool unlock)
+{
+	int retval = ERROR_OK;
+
+	int section;
+	uint32_t section_offset;
+	struct flash_bank *c;
+	int *padding;
+
+	section = 0;
+	section_offset = 0;
+
+	if (written)
+		*written = 0;
+
+	if (erase)
+	{
+		/* assume all sectors need erasing - stops any problems
+		 * when flash_write is called multiple times */
+
+		flash_set_dirty();
+	}
+
+	/* allocate padding array */
+	padding = malloc(image->num_sections * sizeof(padding));
+
+	/* loop until we reach end of the image */
+	while (section < image->num_sections)
+	{
+		uint32_t buffer_size;
+		uint8_t *buffer;
+		int section_first;
+		int section_last;
+		uint32_t run_address = image->sections[section].base_address + section_offset;
+		uint32_t run_size = image->sections[section].size - section_offset;
+		int pad_bytes = 0;
+
+		if (image->sections[section].size ==  0)
+		{
+			LOG_WARNING("empty section %d", section);
+			section++;
+			section_offset = 0;
+			continue;
+		}
+
+		/* find the corresponding flash bank */
+		if ((c = get_flash_bank_by_addr(target, run_address)) == NULL)
+		{
+			section++; /* and skip it */
+			section_offset = 0;
+			continue;
+		}
+
+		/* collect consecutive sections which fall into the same bank */
+		section_first = section;
+		section_last = section;
+		padding[section] = 0;
+		while ((run_address + run_size - 1 < c->base + c->size - 1)
+				&& (section_last + 1 < image->num_sections))
+		{
+			if (image->sections[section_last + 1].base_address < (run_address + run_size))
+			{
+				LOG_DEBUG("section %d out of order(very slightly surprising, but supported)", section_last + 1);
+				break;
+			}
+			/* if we have multiple sections within our image, flash programming could fail due to alignment issues
+			 * attempt to rebuild a consecutive buffer for the flash loader */
+			pad_bytes = (image->sections[section_last + 1].base_address) - (run_address + run_size);
+			if ((run_address + run_size + pad_bytes) > (c->base + c->size))
+				break;
+			padding[section_last] = pad_bytes;
+			run_size += image->sections[++section_last].size;
+			run_size += pad_bytes;
+			padding[section_last] = 0;
+
+			LOG_INFO("Padding image section %d with %d bytes", section_last-1, pad_bytes);
+		}
+
+		/* fit the run into bank constraints */
+		if (run_address + run_size - 1 > c->base + c->size - 1)
+		{
+			LOG_WARNING("writing %d bytes only - as image section is %d bytes and bank is only %d bytes", \
+				    (int)(c->base + c->size - run_address), (int)(run_size), (int)(c->size));
+			run_size = c->base + c->size - run_address;
+		}
+
+		/* allocate buffer */
+		buffer = malloc(run_size);
+		buffer_size = 0;
+
+		/* read sections to the buffer */
+		while (buffer_size < run_size)
+		{
+			size_t size_read;
+
+			size_read = run_size - buffer_size;
+			if (size_read > image->sections[section].size - section_offset)
+			    size_read = image->sections[section].size - section_offset;
+
+			if ((retval = image_read_section(image, section, section_offset,
+					size_read, buffer + buffer_size, &size_read)) != ERROR_OK || size_read == 0)
+			{
+				free(buffer);
+				free(padding);
+				return retval;
+			}
+
+			/* see if we need to pad the section */
+			while (padding[section]--)
+				 (buffer + buffer_size)[size_read++] = 0xff;
+
+			buffer_size += size_read;
+			section_offset += size_read;
+
+			if (section_offset >= image->sections[section].size)
+			{
+				section++;
+				section_offset = 0;
+			}
+		}
+
+		retval = ERROR_OK;
+
+		if (unlock)
+		{
+			retval = flash_unlock_address_range(target, run_address, run_size);
+		}
+		if (retval == ERROR_OK)
+		{
+			if (erase)
+			{
+				/* calculate and erase sectors */
+				retval = flash_erase_address_range(target, run_address, run_size);
+			}
+		}
+
+		if (retval == ERROR_OK)
+		{
+			/* write flash sectors */
+			retval = flash_driver_write(c, buffer, run_address - c->base, run_size);
+		}
+
+		free(buffer);
+
+		if (retval != ERROR_OK)
+		{
+			free(padding);
+			return retval; /* abort operation */
+		}
+
+		if (written != NULL)
+			*written += run_size; /* add run size to total written counter */
+	}
+
+	free(padding);
+
+	return retval;
+}
+
+int flash_write(struct target *target, struct image *image,
+		uint32_t *written, int erase)
+{
+	return flash_write_unlock(target, image, written, erase, false);
+}