hp/pavilion_m6_1035dx: Add basic EC initialization

The EC is now set to ACPI mode, and properly generates SCIs on
external events. This fixes the issue where battery notifications were
not working.
The keyboard matrix type is also explicitly set up.

Change-Id: Ib6f0d23984d4ed1320340282469b8325c83547d1
Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Reviewed-on: http://review.coreboot.org/5471
Tested-by: build bot (Jenkins)
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>

src/mainboard/hp/pavilion_m6_1035dx/Makefile.inc

@@ -26,3 +26,4 @@ ramstage-y += buildOpts.c
 ramstage-y += agesawrapper.c
 ramstage-y += BiosCallOuts.c
 ramstage-y += PlatformGnbPcie.c
+ramstage-y += ec.c

src/mainboard/hp/pavilion_m6_1035dx/ec.c

@@ -0,0 +1,28 @@
+/*
+ * Copyright (C) 2014 Alexandru Gagniuc <mr.nuke.me@gmail.com>
+ * Subject to the GNU GPL v2, or (at your option) any later version.
+ */
+
+#include "ec.h"
+#include <ec/compal/ene932/ec.h>
+
+/* The keyboard matrix tells the EC how the keyboard is wired internally */
+static void set_keyboard_matrix_us(void)
+{
+	ec_kbc_write_cmd(0x59);
+	ec_kbc_write_ib(0xE5);
+}
+
+/* Tell EC to operate in ACPI mode, thus generating SCIs on events, not SMIs */
+static void enter_acpi_mode(void)
+{
+	ec_kbc_write_cmd(0x59);
+	ec_kbc_write_ib(0xE8);
+}
+
+void pavilion_m6_1035dx_ec_init(void)
+{
+	set_keyboard_matrix_us();
+	/* This could also be done in an SMI, should we decide to use SMM */
+	enter_acpi_mode();
+}

src/mainboard/hp/pavilion_m6_1035dx/ec.h

@@ -0,0 +1,11 @@
+/*
+ * Copyright (C) 2014 Alexandru Gagniuc <mr.nuke.me@gmail.com>
+ * Subject to the GNU GPL v2, or (at your option) any later version.
+ */
+
+#ifndef _MAINBOARD_HP_PAVILION_M6_1035DX_EC_H
+#define _MAINBOARD_HP_PAVILION_M6_1035DX_EC_H
+
+void pavilion_m6_1035dx_ec_init(void);
+
+#endif /* _MAINBOARD_HP_PAVILION_M6_1035DX_EC_H   */

src/mainboard/hp/pavilion_m6_1035dx/mainboard.c

@@ -19,6 +19,7 @@
 
 #include "agesawrapper.h"
 #include "BiosCallOuts.h"
+#include "ec.h"
 
 #include <arch/acpi.h>
 #include <arch/io.h>
@@ -35,6 +36,9 @@
 static void mainboard_enable(device_t dev)
 {
 	printk(BIOS_INFO, "Mainboard " CONFIG_MAINBOARD_PART_NUMBER " Enable.\n");
+
+	pavilion_m6_1035dx_ec_init();
+
 	/*
 	 * The mainboard is the first place that we get control in ramstage. Check
 	 * for S3 resume and call the approriate AGESA/CIMx resume functions.