Change in coreboot[master]: drvs/ec/lenovo/h8: Add ssdt generator

[Patrick Rudolph (Code Review)]

Patrick Rudolph has uploaded this change for review. ( https://review.coreboot.org/20985

Change subject: drvs/ec/lenovo/h8: Add ssdt generator
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drvs/ec/lenovo/h8: Add ssdt generator

Add SSDT generator to add dynamic ACPI code.
Implement GBDC and SBDC for thinkpad_acpi kernel module.

Tested on Lenovo T430:
The bluetooth module is detected and can be powercycled using network manager.

Change-Id: Ida825196650966194a883945896a038b0790fe45
Signed-off-by: Patrick Rudolph 
---
M src/ec/lenovo/h8/Makefile.inc
M src/ec/lenovo/h8/h8.c
M src/ec/lenovo/h8/h8.h
A src/ec/lenovo/h8/ssdt.c
4 files changed, 136 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/85/20985/1

diff --git a/src/ec/lenovo/h8/Makefile.inc b/src/ec/lenovo/h8/Makefile.inc
index a02543a..5c85e6f 100644
--- a/src/ec/lenovo/h8/Makefile.inc
+++ b/src/ec/lenovo/h8/Makefile.inc
@@ -3,6 +3,7 @@
 ramstage-y += h8.c
 ramstage-y += bluetooth.c
 ramstage-y += wwan.c
+ramstage-$(CONFIG_HAVE_ACPI_TABLES) += ssdt.c
 smm-y += smm.c

endif
diff --git a/src/ec/lenovo/h8/h8.c b/src/ec/lenovo/h8/h8.c
index 882ac02..8b8f49f 100644
--- a/src/ec/lenovo/h8/h8.c
+++ b/src/ec/lenovo/h8/h8.c
@@ -181,10 +181,21 @@
    pc_keyboard_init(NO_AUX_DEVICE);
 }

+#if IS_ENABLED(CONFIG_HAVE_ACPI_TABLES)
+static const char* h8_acpi_name(struct device *dev)
+{
+	return "EC";
+}
+#endif
+
 struct device_operations h8_dev_ops = {
 #if IS_ENABLED(CONFIG_GENERATE_SMBIOS_TABLES)
    .get_smbios_strings = h8_smbios_strings,
 #endif
+#if IS_ENABLED(CONFIG_HAVE_ACPI_TABLES)
+	.acpi_fill_ssdt_generator = h8_ssdt_generator,
+	.acpi_name = h8_acpi_name,
+#endif
    .init = h8_init,
 };

diff --git a/src/ec/lenovo/h8/h8.h b/src/ec/lenovo/h8/h8.h
index 4175463..951d22f 100644
--- a/src/ec/lenovo/h8/h8.h
+++ b/src/ec/lenovo/h8/h8.h
@@ -39,6 +39,8 @@
 bool h8_wwan_nv_enable(void);
 bool h8_has_wwan(struct device *dev);

+void h8_ssdt_generator(struct device *dev);
+
 /* EC registers */
 #define H8_CONFIG0 0x00
 #define H8_CONFIG0_EVENTS_ENABLE	0x02
diff --git a/src/ec/lenovo/h8/ssdt.c b/src/ec/lenovo/h8/ssdt.c
new file mode 100644
index 0000000..eb9f2c1
--- /dev/null
+++ b/src/ec/lenovo/h8/ssdt.c
@@ -0,0 +1,122 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2017 Patrick Rudolph 
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <southbridge/intel/common/gpio.h>
+#include <console/console.h>
+#include <device/device.h>
+#include <ec/acpi/ec.h>
+#include <arch/acpigen.h>
+#include <option.h>
+#include <string.h>
+
+#include "h8.h"
+#include "chip.h"
+
+static char *h8_dsdt_scope(struct device *dev, const char *scope)
+{
+	static char buf[DEVICE_PATH_MAX] = {};
+	const char *path = acpi_device_path(dev);
+
+	memset(buf, 0, sizeof(buf));
+	snprintf(buf, sizeof(buf) - 1, "%s.%s", path, scope);
+
+	return buf;
+}
+
+/* Generate ACPI methods GBDC and SBDC */
+static void h8_dsdt_bluetooth(struct device *dev)
+{
+	const bool has_bdc = h8_has_bdc(dev);
+
+	/* Method (GBDC, 0) */
+	acpigen_write_method("GBDC", 0);
+	/* Store(Zero, Local0) */
+	acpigen_write_store_ops(ZERO_OP, LOCAL0_OP);
+	if (has_bdc) {
+		/* BDC present */
+		/* Or(Local0, One, Local0) */
+		acpigen_write_or(LOCAL0_OP, ONE_OP, LOCAL0_OP);
+
+		/* If(LEqual(_SB.PCI0.LPCB.EC.BTEB, One)) */
+		acpigen_write_if();
+		acpigen_emit_byte(LEQUAL_OP);
+		acpigen_emit_namestring(h8_dsdt_scope(dev, "BTEB"));
+		acpigen_emit_byte(ONE_OP);
+
+		/* Or(Local0, 2, Local0) */
+		acpigen_emit_byte(OR_OP);
+		acpigen_emit_byte(LOCAL0_OP);
+		acpigen_write_integer(2);
+		acpigen_emit_byte(LOCAL0_OP);
+		acpigen_pop_len(); /* If */
+
+		/* State at resume: Enabled */
+		/* Or(Local0, 4, Local0) */
+		acpigen_emit_byte(OR_OP);
+		acpigen_emit_byte(LOCAL0_OP);
+		acpigen_write_integer(4);
+		acpigen_emit_byte(LOCAL0_OP);
+	}
+	/* Return(Local0) */
+	acpigen_emit_byte(RETURN_OP);
+	acpigen_emit_byte(LOCAL0_OP);
+	acpigen_pop_len(); /* Method */
+
+	/* Method (SBDC, 0) */
+	acpigen_write_method("SBDC", 1);
+	if (has_bdc) {
+		/* And(Arg0, 2, Local0) */
+		acpigen_emit_byte(AND_OP);
+		acpigen_emit_byte(ARG0_OP);
+		acpigen_write_integer(2);
+		acpigen_emit_byte(LOCAL0_OP);
+		/* If(Lequal(Local0, 2)) */
+		acpigen_write_if_lequal_op_int(LOCAL0_OP, 2);
+		/* Store(One, _SB.PCI0.LPCB.EC.BTEB) */
+		acpigen_write_store();
+		acpigen_emit_byte(ONE_OP);
+		acpigen_emit_namestring(h8_dsdt_scope(dev, "BTEB"));
+		acpigen_pop_len(); /* If */
+		/* Else */
+		acpigen_write_else();
+		/* Store(Zero, _SB.PCI0.LPCB.EC.BTEB) */
+		acpigen_write_store();
+		acpigen_emit_byte(ZERO_OP);
+		acpigen_emit_namestring(h8_dsdt_scope(dev, "BTEB"));
+		acpigen_pop_len(); /* Else */
+
+		/* FIXME: Implement state at resume */
+	}
+	acpigen_pop_len(); /* Method */
+}
+
+/*
+ * Generates EC SSDT.
+ */
+void h8_ssdt_generator(struct device *dev)
+{
+	if (!acpi_device_path(dev))
+		return;
+
+	printk(BIOS_INFO, "ACPI:    * H8\n");
+
+	/* Scope HKEY */
+	acpigen_write_scope(h8_dsdt_scope(dev, "HKEY"));
+
+	/* Used by thinkpad_acpi */
+	h8_dsdt_bluetooth(dev);
+
+	acpigen_pop_len(); /* Scope HKEY */
+}