[S] Change in coreboot[main]: superio/nuvoton/nct6779d: Add power_on_after_fail support

[Keith Hui (Code Review)]

Keith Hui has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/81883?usp=email )

Change subject: superio/nuvoton/nct6779d: Add power_on_after_fail support
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superio/nuvoton/nct6779d: Add power_on_after_fail support

Using code from superio/nuvoton/nct5572d (which has the same registers
as '6779), add support for configuring power state after power failure
using power_on_after_fail nvram option.

TEST=Set nvram option to "enable" on mainboard/asus/p8z77-m, pulled
power plug, board powers on after restoring power. Board remains off
after power restore with nvram option set to "keep". Super I/O
configured correctly per datasheet and superiotool -d.

Change-Id: Ia08cf8daac971397e832996ed364d41e9e7b1c5d
Signed-off-by: Keith Hui 
---
M src/superio/nuvoton/nct6779d/Kconfig
M src/superio/nuvoton/nct6779d/superio.c
2 files changed, 31 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/83/81883/1

diff --git a/src/superio/nuvoton/nct6779d/Kconfig b/src/superio/nuvoton/nct6779d/Kconfig
index ce2af16..f60cf1c 100644
--- a/src/superio/nuvoton/nct6779d/Kconfig
+++ b/src/superio/nuvoton/nct6779d/Kconfig
@@ -3,3 +3,5 @@
 config SUPERIO_NUVOTON_NCT6779D
    bool
    select SUPERIO_NUVOTON_COMMON_PRE_RAM
+	select HAVE_POWER_STATE_AFTER_FAILURE
+	select HAVE_POWER_STATE_PREVIOUS_AFTER_FAILURE
diff --git a/src/superio/nuvoton/nct6779d/superio.c b/src/superio/nuvoton/nct6779d/superio.c
index 1360476..e908c9c 100644
--- a/src/superio/nuvoton/nct6779d/superio.c
+++ b/src/superio/nuvoton/nct6779d/superio.c
@@ -3,12 +3,16 @@
 #include <device/device.h>
 #include <device/pnp.h>
 #include <pc80/keyboard.h>
+#include <option.h>
 #include <superio/conf_mode.h>

#include "nct6779d.h"

static void nct6779d_init(struct device *dev)
 {
+	uint8_t byte;
+	uint8_t power_status;
+
    if (!dev->enabled)
    	return;

@@ -17,6 +21,31 @@
    case NCT6779D_KBC:
    	pc_keyboard_init(NO_AUX_DEVICE);
    	break;
+	case NCT6779D_ACPI:
+		/* Set power state after power fail.
+		 * NOTE: This depends on CONFIG_MAINBOARD_POWER_FAILURE_STATE to be defined as:
+		 *
+		 * config MAINBOARD_POWER_FAILURE_STATE
+		 *     int
+		 *     default 2 if POWER_STATE_PREVIOUS_AFTER_FAILURE
+		 *     default 1 if POWER_STATE_ON_AFTER_FAILURE
+		 *     default 0
+		 *
+		 * ... matching this hardware.
+		 * If this definition changes, this code has to be adapted similar to
+		 * NCT5572D.
+		 */
+
+		power_status = get_uint_option("power_on_after_fail",
+				CONFIG_MAINBOARD_POWER_FAILURE_STATE) & 0x03;
+		pnp_enter_conf_mode(dev);
+		pnp_set_logical_device(dev);
+		byte = pnp_read_config(dev, 0xe4);
+		byte &= ~0x60;
+		byte |= (power_status << 5);
+		pnp_write_config(dev, 0xe4, byte);
+		pnp_exit_conf_mode(dev);
+		break;
    }
 }