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drivers/pc80/rtc: Remove CMOS spinlock 

This was only used with amdfam10h-15h, and only in romstage
while commentary elsewhere says concurrent CMOS and CBFS
access caused issues.

We would want a cleaner approach on this, if re-implemented.

Change-Id: I8512196cb55ff2b4542b1421a1bbae540450115a
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/37074
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
This commit is contained in:
Kyösti Mälkki 2019-08-19 16:14:15 +03:00
parent 3382e53c64
commit 9bb16cd9c5
1 changed files with 0 additions and 21 deletions
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21
src/drivers/pc80/rtc/mc146818rtc.c
View File

@ -37,17 +37,6 @@
/* Don't warn for checking >= LB_CKS_RANGE_START even though it may be 0. */
#pragma GCC diagnostic ignored "-Wtype-limits"
#include <smp/spinlock.h>
#if (defined(__PRE_RAM__) && \
CONFIG(HAVE_ROMSTAGE_NVRAM_CBFS_SPINLOCK))
#define LOCK_NVRAM_CBFS_SPINLOCK() spin_lock(romstage_nvram_cbfs_lock())
#define UNLOCK_NVRAM_CBFS_SPINLOCK() spin_unlock(romstage_nvram_cbfs_lock())
#else
#define LOCK_NVRAM_CBFS_SPINLOCK() { }
#define UNLOCK_NVRAM_CBFS_SPINLOCK() { }
#endif
static void cmos_reset_date(void)
{
/* Now setup a default date equals to the build date */
@ -274,13 +263,10 @@ enum cb_err get_option(void *dest, const char *name)
if (!CONFIG(USE_OPTION_TABLE))
return CB_CMOS_OTABLE_DISABLED;
LOCK_NVRAM_CBFS_SPINLOCK();
/* Figure out how long name is */
namelen = strnlen(name, CMOS_MAX_NAME_LENGTH);
if (locate_cmos_layout(&rdev) != CB_SUCCESS) {
UNLOCK_NVRAM_CBFS_SPINLOCK();
return CB_CMOS_LAYOUT_NOT_FOUND;
}
ct = rdev_mmap_full(&rdev);
@ -288,7 +274,6 @@ enum cb_err get_option(void *dest, const char *name)
printk(BIOS_ERR, "RTC: cmos_layout.bin could not be mapped. "
"Options are disabled\n");
UNLOCK_NVRAM_CBFS_SPINLOCK();
return CB_CMOS_LAYOUT_NOT_FOUND;
}
@ -304,22 +289,18 @@ enum cb_err get_option(void *dest, const char *name)
if (!found) {
printk(BIOS_DEBUG, "No CMOS option '%s'.\n", name);
rdev_munmap(&rdev, ct);
UNLOCK_NVRAM_CBFS_SPINLOCK();
return CB_CMOS_OPTION_NOT_FOUND;
}
if (!cmos_checksum_valid(LB_CKS_RANGE_START, LB_CKS_RANGE_END, LB_CKS_LOC)) {
rdev_munmap(&rdev, ct);
UNLOCK_NVRAM_CBFS_SPINLOCK();
return CB_CMOS_CHECKSUM_INVALID;
}
if (get_cmos_value(ce->bit, ce->length, dest) != CB_SUCCESS) {
rdev_munmap(&rdev, ct);
UNLOCK_NVRAM_CBFS_SPINLOCK();
return CB_CMOS_ACCESS_ERROR;
}
rdev_munmap(&rdev, ct);
UNLOCK_NVRAM_CBFS_SPINLOCK();
return CB_SUCCESS;
}
@ -392,7 +373,6 @@ enum cb_err set_option(const char *name, void *value)
namelen = strnlen(name, CMOS_MAX_NAME_LENGTH);
if (locate_cmos_layout(&rdev) != CB_SUCCESS) {
UNLOCK_NVRAM_CBFS_SPINLOCK();
return CB_CMOS_LAYOUT_NOT_FOUND;
}
ct = rdev_mmap_full(&rdev);
@ -400,7 +380,6 @@ enum cb_err set_option(const char *name, void *value)
printk(BIOS_ERR, "RTC: cmos_layout.bin could not be mapped. "
"Options are disabled\n");
UNLOCK_NVRAM_CBFS_SPINLOCK();
return CB_CMOS_LAYOUT_NOT_FOUND;
}