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soc/intel/cmn/pmc: Add support for early power off

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This commit adds support for early power off on Intel platforms
along with existing PMC based implementation to support power off
at later stage (like ramstage).

A new function, `platform_do_early_poweroff`, is added to the
pmclib to handle platform-specific early power off procedures.
This function is called before memory initialization (in romstage or
earlier).

Note: While Intel chipsets do not support power off before silicon
initialization, this change leverages Chrome EC APIs to enable power off
in romstage for low-battery boot on ChromeOS devices. Power off failures
in ramstage prior to FSP-S are outside the scope of this change.

BUG=b:339673254
TEST=Able to build and boot google/brox.

Change-Id: I39f516640b3f75ab4c6a09826922289c0533f79b
Signed-off-by: Subrata Banik <subratabanik@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/86336
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>
Reviewed-by: Julius Werner <jwerner@chromium.org>
This commit is contained in:
Subrata Banik 2025-02-14 09:42:22 +00:00
commit 0fe338c88b
1 changed files with 16 additions and 1 deletions
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17
src/soc/intel/common/block/pmc/pmclib.c
View file

@ -15,6 +15,7 @@
#include <intelblocks/gpio.h>
#include <intelblocks/tco.h>
#include <option.h>
#include <reset.h>
#include <security/vboot/vboot_common.h>
#include <soc/pci_devs.h>
#include <soc/pm.h>
@ -615,7 +616,8 @@ void vboot_platform_prepare_reboot(void)
pmc_write_pm1_control(pm1_cnt);
}
void poweroff(void)
/* Helper function to perform poweroff operation using PMC chipset register. */
static void pmc_control_poweroff(void)
{
pmc_enable_pm1_control(SLP_EN | (SLP_TYP_S5 << SLP_TYP_SHIFT));
@ -628,6 +630,19 @@ void poweroff(void)
halt();
}
void poweroff(void)
{
if (!ENV_ROMSTAGE_OR_BEFORE) {
pmc_control_poweroff();
} else if (CONFIG(HAVE_EARLY_POWEROFF_SUPPORT)) {
platform_do_early_poweroff();
} else {
printk(BIOS_EMERG, "This platform cannot be powered off until the silicon"
" initialization is complete, hanging!\n");
halt();
}
}
void pmc_gpe_init(void)
{
uint32_t gpio_cfg = 0;