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Enable continuous SPI reads

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Previous unnecessary page-by-page reading is repurposed to
read by big naturally aligned areas (now chip size limited
to 16MB for future-proofing of 4 byte addressed multi-die chips)
and serprog hack for continuous reads is removed.

Change-Id: Iadf909c9216578b1c5dacd4c4991bb436e32edc9
Signed-off-by: Urja Rannikko <urjaman@gmail.com>
Reviewed-on: https://review.coreboot.org/20223
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Urja Rannikko
2017-06-15 13:32:01 +03:00
committed by Nico Huber
parent 026c741651
commit 731316a912
2 changed files with 15 additions and 35 deletions
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23
serprog.c
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@ -303,15 +303,13 @@ static int serprog_spi_send_command(struct flashctx *flash,
unsigned int writecnt, unsigned int readcnt,
const unsigned char *writearr,
unsigned char *readarr);
static int serprog_spi_read(struct flashctx *flash, uint8_t *buf,
unsigned int start, unsigned int len);
static struct spi_master spi_master_serprog = {
.type = SPI_CONTROLLER_SERPROG,
.max_data_read = MAX_DATA_READ_UNLIMITED,
.max_data_write = MAX_DATA_WRITE_UNLIMITED,
.command = serprog_spi_send_command,
.multicommand = default_spi_send_multicommand,
.read = serprog_spi_read,
.read = default_spi_read,
.write_256 = default_spi_write_256,
.write_aai = default_spi_write_aai,
};
@ -933,25 +931,6 @@ static int serprog_spi_send_command(struct flashctx *flash,
return ret;
}
/* FIXME: This function is optimized so that it does not split each transaction
* into chip page_size long blocks unnecessarily like spi_read_chunked. This has
* the advantage that it is much faster for most chips, but breaks those with
* non-continuous reads. When spi_read_chunked is fixed this method can be removed. */
static int serprog_spi_read(struct flashctx *flash, uint8_t *buf,
unsigned int start, unsigned int len)
{
unsigned int i, cur_len;
const unsigned int max_read = spi_master_serprog.max_data_read;
for (i = 0; i < len; i += cur_len) {
int ret;
cur_len = min(max_read, (len - i));
ret = spi_nbyte_read(flash, start + i, buf + i, cur_len);
if (ret)
return ret;
}
return 0;
}
void *serprog_map(const char *descr, uintptr_t phys_addr, size_t len)
{
/* Serprog transmits 24 bits only and assumes the underlying implementation handles any remaining bits