[coreboot-gerrit] Patch set updated for coreboot: intel/wifi: Create ACPI objects for wifi SAR configuration

[Robbie Zhang (robbie.zhang@intel.com)]

Robbie Zhang (robbie.zhang at intel.com) just uploaded a new patch set to gerrit, which you can find at https://review.coreboot.org/17959

-gerrit

commit 01988c41050a294c3e71653ed540ca6c828230ff
Author: Robbie Zhang <robbie.zhang at intel.com>
Date:   Fri Dec 23 12:20:47 2016 -0800

    intel/wifi: Create ACPI objects for wifi SAR configuration
    
    To support intel wifi SAR configuration, it is required coreboot
    to publish two ACPI objects (WRDS and EWRD) to supply SAR limit
    data sets. VPD entry "wifi_sar" is required to supply the raw SAR
    limit data.
    
    BUG=chrome-os-partner:60821
    TEST=Build and boot lars and reef
    
    Change-Id: I6be345735292d0ca46f2f7e7ea61924990d338a8
    Signed-off-by: Robbie Zhang <robbie.zhang at intel.com>
---
 src/drivers/intel/wifi/Kconfig | 24 ++++++++++++++++
 src/drivers/intel/wifi/chip.h  | 32 +++++++++++++++++++++
 src/drivers/intel/wifi/wifi.c  | 64 ++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 120 insertions(+)

diff --git a/src/drivers/intel/wifi/Kconfig b/src/drivers/intel/wifi/Kconfig
index 330de6c..1e6be6d 100644
--- a/src/drivers/intel/wifi/Kconfig
+++ b/src/drivers/intel/wifi/Kconfig
@@ -5,3 +5,27 @@ config DRIVERS_INTEL_WIFI
 	help
 	   When enabled, add identifiers in ACPI and SMBIOS tables to
 	   make OS drivers work with certain Intel PCI-e WiFi chipsets.
+
+config USE_SAR
+	bool
+	default n
+	help
+	  Enable it when wifi driver uses SAR configuration feature.
+	  VPD entry "wifi_sar" is required to support it.
+
+config SAR_ENABLE
+	bool
+	default n
+	depends on USE_SAR
+
+config DSAR_ENABLE
+	bool
+	default n
+	depends on USE_SAR
+
+config DSAR_SET_NUM
+	hex "Number of SAR sets when D-SAR is enabled"
+	default 0x3
+	depends on USE_SAR
+	help
+	  There can be up to 3 optional SAR table sets.
diff --git a/src/drivers/intel/wifi/chip.h b/src/drivers/intel/wifi/chip.h
index 117d39c..0871874 100644
--- a/src/drivers/intel/wifi/chip.h
+++ b/src/drivers/intel/wifi/chip.h
@@ -1,3 +1,35 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2016-2017 Intel Corporation
+ *
+ * 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.
+ */
+
+#ifndef _WIFI_CHIP_H_
+#define _WIFI_CHIP_H_
+
+/* WRDS Spec Revision */
+#define WRDS_REVISION 0x0
+
+/* EWRD Spec Revision */
+#define EWRD_REVISION 0x0
+
+/* WRDS Domain type */
+#define WRDS_DOMAIN_TYPE_WIFI 0x7
+
+/* EWRD Domain type */
+#define EWRD_DOMAIN_TYPE_WIFI 0x7
+
 struct drivers_intel_wifi_config {
 	unsigned wake; /* Wake pin for ACPI _PRW */
 };
+
+#endif /* _WIFI_CHIP_H_ */
diff --git a/src/drivers/intel/wifi/wifi.c b/src/drivers/intel/wifi/wifi.c
index 789d0d5..db67c42 100644
--- a/src/drivers/intel/wifi/wifi.c
+++ b/src/drivers/intel/wifi/wifi.c
@@ -20,6 +20,7 @@
 #include <device/device.h>
 #include <device/pci.h>
 #include <device/pci_ids.h>
+#include <sar.h>
 #include <smbios.h>
 #include <string.h>
 #include <wrdd.h>
@@ -59,6 +60,65 @@ static int smbios_write_wifi(struct device *dev, int *handle,
 #endif
 
 #if IS_ENABLED(CONFIG_HAVE_ACPI_TABLES)
+static void emit_sar_acpi_structures(void)
+{
+	int i, j;
+	struct wifi_sar_limits sar_limits;
+
+	/* Retrieve the sar limits data */
+	if (get_wifi_sar_limits(&sar_limits) < 0) {
+		printk(BIOS_ERR, "Error: failed from getting SAR limits!\n");
+		return;
+	}
+
+	/*
+	 * Name ("WRDS", Package () {
+	 *   Revision,
+	 *   Package () {
+	 *     Domain Type,	// 0x7:WiFi
+	 *     WiFi SAR BIOS,	// BIOS SAR Enable/disable
+	 *     SAR Table Set	// Set#1 of SAR Table (10 bytes)
+	 *   }
+	 * })
+	 */
+	acpigen_write_name("WRDS");
+	acpigen_write_package(2);
+	acpigen_write_dword(WRDS_REVISION);
+	acpigen_write_package(12);
+	acpigen_write_dword(WRDS_DOMAIN_TYPE_WIFI);
+	acpigen_write_dword(CONFIG_SAR_ENABLE);
+	for (i = 0; i < BYTES_PER_SAR_LIMIT; i++)
+		acpigen_write_byte(sar_limits.sar_limit[0][i]);
+	acpigen_pop_len();
+	acpigen_pop_len();
+
+	/*
+	 * Name ("EWRD", Package () {
+	 *   Revision,
+	 *   Package () {
+	 *     Domain Type,		// 0x7:WiFi
+	 *     Dynamic SAR Enable,	// Dynamic SAR Enable/disable
+	 *     Extended SAR sets,	// Number of optional SAR table sets
+	 *     SAR Table Set,		// Set#2 of SAR Table (10 bytes)
+	 *     SAR Table Set,		// Set#3 of SAR Table (10 bytes)
+	 *     SAR Table Set		// Set#4 of SAR Table (10 bytes)
+	 *   }
+	 * })
+	 */
+	acpigen_write_name("EWRD");
+	acpigen_write_package(2);
+	acpigen_write_dword(EWRD_REVISION);
+	acpigen_write_package(33);
+	acpigen_write_dword(EWRD_DOMAIN_TYPE_WIFI);
+	acpigen_write_dword(CONFIG_DSAR_ENABLE);
+	acpigen_write_dword(CONFIG_DSAR_SET_NUM);
+	for (i = 1; i < NUM_SAR_LIMITS; i++)
+		for (j = 0; j < BYTES_PER_SAR_LIMIT; j++)
+			acpigen_write_byte(sar_limits.sar_limit[i][j]);
+	acpigen_pop_len();
+	acpigen_pop_len();
+}
+
 static void intel_wifi_fill_ssdt(struct device *dev)
 {
 	struct drivers_intel_wifi_config *config = dev->chip_info;
@@ -105,6 +165,10 @@ static void intel_wifi_fill_ssdt(struct device *dev)
 		acpigen_pop_len();
 	}
 
+	/* Fill Wifi sar related ACPI structures */
+	if (IS_ENABLED(CONFIG_USE_SAR))
+		emit_sar_acpi_structures();
+
 	acpigen_pop_len(); /* Device */
 	acpigen_pop_len(); /* Scope */