Review and simplify computation of bufferwsize.
Add comments about variables' meaning.
The same code is present 3 times in the file.
Current patch updates all the 3 instances.
Step 1)
Replace "switch(bank->chip_width) {...}".
Illegal values of bank->chip_width are already dropped.
For legal values, the code is equivalent to:
bufferwsize = buffersize / bank->chip_width;
Step 2)
The above code replacement plus the following line:
bufferwsize /= (bank->bus_width / bank->chip_width);
is merged in a single formula:
bufferwsize = (buffersize / bank->chip_width) /
(bank->bus_width / bank->chip_width);
and simplified as:
bufferwsize = buffersize / bank->bus_width;
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
struct target *target = bank->target;
/* Calculate buffer size and boundary mask */
struct target *target = bank->target;
/* Calculate buffer size and boundary mask */
+ /* buffersize is (buffer size per chip) * (number of chips) */
+ /* bufferwsize is buffersize in words */
uint32_t buffersize = (1UL << cfi_info->max_buf_write_size) * (bank->bus_width / bank->chip_width);
uint32_t buffermask = buffersize-1;
uint32_t buffersize = (1UL << cfi_info->max_buf_write_size) * (bank->bus_width / bank->chip_width);
uint32_t buffermask = buffersize-1;
+ uint32_t bufferwsize = buffersize / bank->bus_width;
/* Check for valid range */
if (address & buffermask)
/* Check for valid range */
if (address & buffermask)
bank->base, address, cfi_info->max_buf_write_size);
return ERROR_FLASH_OPERATION_FAILED;
}
bank->base, address, cfi_info->max_buf_write_size);
return ERROR_FLASH_OPERATION_FAILED;
}
- switch (bank->chip_width)
- {
- case 4 : bufferwsize = buffersize / 4; break;
- case 2 : bufferwsize = buffersize / 2; break;
- case 1 : bufferwsize = buffersize; break;
- default:
- LOG_ERROR("Unsupported chip width %d", bank->chip_width);
- return ERROR_FLASH_OPERATION_FAILED;
- }
-
- bufferwsize/=(bank->bus_width / bank->chip_width);
-
/* Check for valid size */
if (wordcount > bufferwsize)
/* Check for valid size */
if (wordcount > bufferwsize)
struct cfi_spansion_pri_ext *pri_ext = cfi_info->pri_ext;
/* Calculate buffer size and boundary mask */
struct cfi_spansion_pri_ext *pri_ext = cfi_info->pri_ext;
/* Calculate buffer size and boundary mask */
+ /* buffersize is (buffer size per chip) * (number of chips) */
+ /* bufferwsize is buffersize in words */
uint32_t buffersize = (1UL << cfi_info->max_buf_write_size) * (bank->bus_width / bank->chip_width);
uint32_t buffermask = buffersize-1;
uint32_t buffersize = (1UL << cfi_info->max_buf_write_size) * (bank->bus_width / bank->chip_width);
uint32_t buffermask = buffersize-1;
+ uint32_t bufferwsize = buffersize / bank->bus_width;
/* Check for valid range */
if (address & buffermask)
/* Check for valid range */
if (address & buffermask)
LOG_ERROR("Write address at base 0x%" PRIx32 ", address %" PRIx32 " not aligned to 2^%d boundary", bank->base, address, cfi_info->max_buf_write_size);
return ERROR_FLASH_OPERATION_FAILED;
}
LOG_ERROR("Write address at base 0x%" PRIx32 ", address %" PRIx32 " not aligned to 2^%d boundary", bank->base, address, cfi_info->max_buf_write_size);
return ERROR_FLASH_OPERATION_FAILED;
}
- switch (bank->chip_width)
- {
- case 4 : bufferwsize = buffersize / 4; break;
- case 2 : bufferwsize = buffersize / 2; break;
- case 1 : bufferwsize = buffersize; break;
- default:
- LOG_ERROR("Unsupported chip width %d", bank->chip_width);
- return ERROR_FLASH_OPERATION_FAILED;
- }
-
- bufferwsize/=(bank->bus_width / bank->chip_width);
/* Check for valid size */
if (wordcount > bufferwsize)
/* Check for valid size */
if (wordcount > bufferwsize)
{
if (retval == ERROR_TARGET_RESOURCE_NOT_AVAILABLE)
{
{
if (retval == ERROR_TARGET_RESOURCE_NOT_AVAILABLE)
{
- //adjust buffersize for chip width
+ /* Calculate buffer size and boundary mask */
+ /* buffersize is (buffer size per chip) * (number of chips) */
+ /* bufferwsize is buffersize in words */
uint32_t buffersize = (1UL << cfi_info->max_buf_write_size) * (bank->bus_width / bank->chip_width);
uint32_t buffermask = buffersize-1;
uint32_t buffersize = (1UL << cfi_info->max_buf_write_size) * (bank->bus_width / bank->chip_width);
uint32_t buffermask = buffersize-1;
- uint32_t bufferwsize;
-
- switch (bank->chip_width)
- {
- case 4 : bufferwsize = buffersize / 4; break;
- case 2 : bufferwsize = buffersize / 2; break;
- case 1 : bufferwsize = buffersize; break;
- default:
- LOG_ERROR("Unsupported chip width %d", bank->chip_width);
- return ERROR_FLASH_OPERATION_FAILED;
- }
-
- bufferwsize/=(bank->bus_width / bank->chip_width);
+ uint32_t bufferwsize = buffersize / bank->bus_width;
/* fall back to memory writes */
while (count >= (uint32_t)bank->bus_width)
/* fall back to memory writes */
while (count >= (uint32_t)bank->bus_width)