Patch set updated for coreboot: 12434f3 hp/pavilion_m6_1035dx: Shutdown on low battery with non-ACPI OS

[Alexandru Gagniuc]

Alexandru Gagniuc ([e-mail]) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/5527

-gerrit

commit 12434f3fca5c3ed8d31d0192f959da6e2ff6bd84
Author: Alexandru Gagniuc 
Date:   Thu Apr 17 00:47:47 2014 -0500

hp/pavilion_m6_1035dx: Shutdown on low battery with non-ACPI OS

Intercept the low battery SMI from the EC, and shut down the system
    immediately. The EC only sends this SMI when the OS did not enable
    ACPI mode, so ACPI OSes are not affected by this.
    On the other hand, payloads such as GRUB or SeaBIOS will experience
    the shutdown. This behavior is helpful for protecting the battery, for
    example, when the OS fails to boot and we are stuck in the payload.
    The low battery SMI is triggered at 10% charge, at which point the risk
    of cell degradation exists.

Change-Id: I4c6c1a4feed8576cbdbb1945768de0805a1f5e42
    Signed-off-by: Alexandru Gagniuc 
---
 src/mainboard/hp/pavilion_m6_1035dx/mainboard_smi.c | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

diff --git a/src/mainboard/hp/pavilion_m6_1035dx/mainboard_smi.c b/src/mainboard/hp/pavilion_m6_1035dx/mainboard_smi.c
index bb9cc2e..7c1a602 100644
--- a/src/mainboard/hp/pavilion_m6_1035dx/mainboard_smi.c
+++ b/src/mainboard/hp/pavilion_m6_1035dx/mainboard_smi.c
@@ -6,14 +6,18 @@
  */
 #include "ec.h"

+#include <arch/io.h>
 #include <console/console.h>
 #include <cpu/x86/smm.h>
 #include <delay.h>
 #include <ec/compal/ene932/ec.h>
 #include <southbridge/amd/agesa/hudson/hudson.h>

+#define ACPI_PM1_CNT_SLEEP(state) ((1 << 13) | (state & 0x7) << 10)
+
 enum ec_smi_event {
    EC_SMI_EVENT_IDLE = 0x80,
+	EC_SMI_BATTERY_LOW = 0xb3,
 };

/* Tell EC to operate in APM mode. Events generate SMIs instead of SCIs */
@@ -37,12 +41,18 @@ static uint8_t ec_get_smi_event(void)

static void ec_process_smi(uint8_t src)
 {
-	/*
-	 * Stub: We aren't processing any events yet, but reading the SMI source
-	 * satisfies the EC in terms of responding to the event.
+	/* Reading the SMI source satisfies the EC in terms of responding to
+	 * the event, regardless of whether we take an action or not.
     */

-	printk(BIOS_DEBUG, "EC_SMI event 0x%x\n", src);
+	switch (src) {
+	case EC_SMI_BATTERY_LOW:
+		printk(BIOS_DEBUG, "Battery low. Shutting down\n");
+		outl(ACPI_PM1_CNT_SLEEP(5), ACPI_PM1_CNT_BLK);
+		break;
+	default:
+		printk(BIOS_DEBUG, "EC_SMI event 0x%x\n", src);
+	}
 }

static void handle_ec_smi(void)