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soc/amd/common/block/spi/fch_spi_ctrl.c: Fix SPI vendor id code 

All solid state devices have vendor id defined by JEDEC specification JEP106,
which originally allocated only 7 bits for it plus parity. When number of
vendors exploded beyond 126, a banking proposition came maintaining
compatibility with older vendors while allowing for 4 extra bits (16 banks)
through the introduction of the concept "Continuation code", denoted by the
byte value of 0x7f.
Examples:
0xfe, 0x60, 0x18, 0x00, 0x00 => vendor 0xfe of bank o
0x7f, 0x7f, 0xfe, 0x60, 0x18 => vendor 0xfe of bank 2

BUG=b:141535133
TEST=Build and boot grunt.

Change-Id: I16c5df70b8ba65017d1a45c79e90a76d1f78550c
Signed-off-by: Richard Spiegel <richard.spiegel@silverbackltd.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/35589
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Edward O'Callaghan <quasisec@chromium.org>
This commit is contained in:
Richard Spiegel 2019-09-24 17:56:34 -07:00 committed by Patrick Georgi
parent 6aea9f9923
commit 7ae4a268eb
3 changed files with 27 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
src/soc/amd/common/block/include/amdblocks/fch_spi.h
View File

@ -23,7 +23,14 @@
#define WORD_TO_DWORD_UPPER(x) ((x << 16) & 0xffff0000)
#define SPI_PAGE_WRITE 0x02
#define SPI_WRITE_ENABLE 0x06
#define IDCODE_CONT_LEN 0
/*
* IDCODE_CONT_LEN may be redefined if a device needs to declare a
* larger "shift" value. IDCODE_PART_LEN generally shouldn't be
* changed. This is the max number of bytes probe functions may
* examine when looking up part-specific identification info.
*/
#define IDCODE_CONT_CODE 0x7f
#define IDCODE_CONT_LEN 1 /* currently support only bank 0 */
#define IDCODE_PART_LEN 5
#define IDCODE_LEN (IDCODE_CONT_LEN + IDCODE_PART_LEN)

22
src/soc/amd/common/block/spi/fch_spi_ctrl.c
View File

@ -278,12 +278,26 @@ static int fch_spi_flash_probe(const struct spi_slave *spi, struct spi_flash *fl
printk(BIOS_SPEW, "\n");
}
/* count the number of continuation bytes */
for (shift = 0, idp = idcode; shift < IDCODE_CONT_LEN && *idp == 0x7f;
++shift, ++idp)
/*
* All solid state devices have vendor id defined by JEDEC specification JEP106,
* which originally allocated only 7 bits for it plus parity. When number of
* vendors exploded beyond 126, a banking proposition came maintaining
* compatibility with older vendors while allowing for 4 extra bits (16 banks)
* through the introduction of the concept "Continuation Code", denoted by the
* byte value of 0x7f.
* Examples:
* 0xfe, 0x60, 0x18, 0x00, 0x00, 0x00 => vendor 0xfe of bank o
* 0x7f, 0x7f, 0xfe, 0x60, 0x18, 0x00 => vendor 0xfe of bank 2
* count the number of continuation code bytes
*/
for (shift = 0, idp = idcode; *idp == IDCODE_CONT_CODE; ++shift, ++idp) {
if (shift < IDCODE_CONT_LEN)
continue;
printk(BIOS_ERR, "unsupported ID code bank\n");
return -1;
}
printk(BIOS_INFO, "Manufacturer: %02x\n", *idp);
printk(BIOS_INFO, "Manufacturer: %02x on bank %d\n", *idp, shift);
/* search the table for matches in shift and id */
for (i = 0; i < table_size; ++i) {

5
src/soc/amd/common/block/spi/fch_spi_table.c
View File

@ -30,11 +30,6 @@
* Several matching entries are permitted, they will be tried
* in sequence until a probe function returns non NULL.
*
* IDCODE_CONT_LEN may be redefined if a device needs to declare a
* larger "shift" value. IDCODE_PART_LEN generally shouldn't be
* changed. This is the max number of bytes probe functions may
* examine when looking up part-specific identification info.
*
* Probe functions will be given the idcode buffer starting at their
* manu id byte (the "idcode" in the table below). In other words,
* all of the continuation bytes will be skipped (the "shift" below).