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mb/prodrive/atlas: Rework EEPROM layout structures 

To avoid having to calculate the length of a struct separately, rework
the code to give the struct a tag name, so that `sizeof()` can be used
instead. This involves refactoring the `get_emi_eeprom_vpd()` function
to return a struct instead of a union, so callers can no longer access
the EEPROM data as an array of bytes without additional code, but this
array view is only used inside `get_emi_eeprom_vpd()` when reading the
data from EMI.

Change-Id: Id1bc40939631baa131b5f60eadbfe42838294ebe
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/73983
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Maximilian Brune <maximilian.brune@9elements.com>
Reviewed-by: Lean Sheng Tan <sheng.tan@9elements.com>
This commit is contained in:
Angel Pons 2023-03-27 12:06:08 +02:00 committed by Felix Held
parent 603dd56618
commit d4c5fc0e8e
2 changed files with 26 additions and 32 deletions
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36
src/mainboard/prodrive/atlas/vpd.c
View File

@ -8,22 +8,26 @@
#include "mainboard.h"
#include "vpd.h"
const union emi_eeprom_vpd *get_emi_eeprom_vpd(void)
const struct emi_eeprom_vpd *get_emi_eeprom_vpd(void)
{
static union emi_eeprom_vpd vpd = {0};
static union {
struct emi_eeprom_vpd layout;
uint8_t raw[sizeof(struct emi_eeprom_vpd)];
} vpd = {0};
/* Check if cached VPD is valid */
if (vpd.header.revision == VPD_LATEST_REVISION)
return &vpd;
if (vpd.layout.header.revision == VPD_LATEST_REVISION)
return &vpd.layout;
ec_emi_read(vpd.raw, EMI_0_IO_BASE_ADDR, 0, 0, sizeof(vpd.raw));
/* If the magic value doesn't match, consider EEPROM VPD unreliable */
if (vpd.header.magic != VPD_MAGIC) {
if (vpd.layout.header.magic != VPD_MAGIC) {
printk(BIOS_WARNING, "Atlas VPD: Bad magic value, using fallback defaults\n");
vpd.header.revision = 0;
vpd.layout.header.revision = 0;
} else {
printk(BIOS_DEBUG, "Atlas VPD: Got revision %u from EC\n", vpd.header.revision);
printk(BIOS_DEBUG, "Atlas VPD: Got revision %u from EC\n",
vpd.layout.header.revision);
}
/*
@ -40,21 +44,21 @@ const union emi_eeprom_vpd *get_emi_eeprom_vpd(void)
* of the VPD structure with a reasonable fallback value. Note the
* intentional falling through.
*/
switch (vpd.header.revision) {
switch (vpd.layout.header.revision) {
case 0:
memset(vpd.raw, 0, sizeof(vpd.raw));
vpd.header.magic = VPD_MAGIC;
vpd.serial_number[0] = '\0';
vpd.part_number[0] = '\0';
vpd.profile = ATLAS_PROF_UNPROGRAMMED;
vpd.layout.header.magic = VPD_MAGIC;
vpd.layout.serial_number[0] = '\0';
vpd.layout.part_number[0] = '\0';
vpd.layout.profile = ATLAS_PROF_UNPROGRAMMED;
__fallthrough;
default:
/* Ensure serial numbers are NULL-terminated, update revision last */
vpd.serial_number[ATLAS_SN_PN_LENGTH - 1] = '\0';
vpd.part_number[ATLAS_SN_PN_LENGTH - 1] = '\0';
vpd.header.revision = VPD_LATEST_REVISION;
vpd.layout.serial_number[ATLAS_SN_PN_LENGTH - 1] = '\0';
vpd.layout.part_number[ATLAS_SN_PN_LENGTH - 1] = '\0';
vpd.layout.header.revision = VPD_LATEST_REVISION;
break;
}
return &vpd;
return &vpd.layout;
}

14
src/mainboard/prodrive/atlas/vpd.h
View File

@ -36,24 +36,14 @@ enum atlas_profile {
#define ATLAS_SN_PN_LENGTH 20
#define EMI_EEPROM_LAYOUT_LENGTH ( \
sizeof(struct emi_eeprom_vpd_header) + \
ATLAS_SN_PN_LENGTH + \
ATLAS_SN_PN_LENGTH + \
sizeof(uint16_t) \
)
union emi_eeprom_vpd {
struct __packed {
struct __packed emi_eeprom_vpd {
struct emi_eeprom_vpd_header header;
char serial_number[ATLAS_SN_PN_LENGTH]; /* xx-xx-xxx-xxx */
char part_number[ATLAS_SN_PN_LENGTH]; /* xxx-xxxx-xxxx.Rxx */
uint16_t profile;
};
uint8_t raw[EMI_EEPROM_LAYOUT_LENGTH];
};
/* Always returns a non-NULL pointer to valid data */
const union emi_eeprom_vpd *get_emi_eeprom_vpd(void);
const struct emi_eeprom_vpd *get_emi_eeprom_vpd(void);
#endif /* ATLAS_VPD_H */