Robbie Zhang (robbie.zhang@intel.com) just uploaded a new patch set to gerrit, which you can find at https://review.coreboot.org/17958
-gerrit
commit 7280b732a14404aa96ffc77bcfa10f70bbcd6501 Author: Robbie Zhang robbie.zhang@intel.com Date: Fri Dec 23 11:43:07 2016 -0800
chromeos: Implement locating and decoding wifi sar data from VPD
A VPD entry "wifi_sar" needs to be created which contains a heximal encoded string in length of 40 bytes. wifi_sar_limits() function retrieves and decodes the data from the VPD entry, which would later be consumed by platform code.
BUG=chrome-os-partner:60821 TEST=Build and boot lars and reef
Change-Id: I923b58a63dc1f8a7fdd685cf1c618b2fdf4e7061 Signed-off-by: Robbie Zhang robbie.zhang@intel.com --- src/include/sar.h | 28 ++++++++++ src/vendorcode/google/chromeos/Makefile.inc | 1 + src/vendorcode/google/chromeos/cros_vpd.h | 1 + src/vendorcode/google/chromeos/sar.c | 82 +++++++++++++++++++++++++++++ 4 files changed, 112 insertions(+)
diff --git a/src/include/sar.h b/src/include/sar.h new file mode 100644 index 0000000..32e83ec --- /dev/null +++ b/src/include/sar.h @@ -0,0 +1,28 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2016 Intel Corp. + * + * 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 _SAR_H_ +#define _SAR_H_ + +#include <stdint.h> + +/* Wifi SAR limit table structure */ +struct wifi_sar_limit_t{ + uint8_t sar_limit[40]; /* Total 4 SAR limit sets, each has 10 bytes */ +}; + +/* Retrieve the SAR limits data from VPD and decode it */ +void wifi_sar_limits(struct wifi_sar_limit_t *sar_limits); + +#endif /* _SAR_H_ */ diff --git a/src/vendorcode/google/chromeos/Makefile.inc b/src/vendorcode/google/chromeos/Makefile.inc index e84eb3d..878b068 100644 --- a/src/vendorcode/google/chromeos/Makefile.inc +++ b/src/vendorcode/google/chromeos/Makefile.inc @@ -25,6 +25,7 @@ ramstage-$(CONFIG_CHROMEOS_RAMOOPS) += ramoops.c romstage-y += vpd_decode.c ramstage-y += vpd_decode.c cros_vpd.c vpd_mac.c vpd_serialno.c vpd_calibration.c ramstage-$(CONFIG_HAVE_REGULATORY_DOMAIN) += wrdd.c +ramstage-$(CONFIG_USE_SAR) += sar.c ifeq ($(CONFIG_ARCH_MIPS),) bootblock-y += watchdog.c ramstage-y += watchdog.c diff --git a/src/vendorcode/google/chromeos/cros_vpd.h b/src/vendorcode/google/chromeos/cros_vpd.h index 96ca8af..1fa56a4 100644 --- a/src/vendorcode/google/chromeos/cros_vpd.h +++ b/src/vendorcode/google/chromeos/cros_vpd.h @@ -8,6 +8,7 @@ #define __CROS_VPD_H__
#define CROS_VPD_REGION_NAME "region" +#define CROS_VPD_WIFI_SAR_NAME "wifi_sar"
/* * Reads VPD string value by key. diff --git a/src/vendorcode/google/chromeos/sar.c b/src/vendorcode/google/chromeos/sar.c new file mode 100644 index 0000000..c5adbf1 --- /dev/null +++ b/src/vendorcode/google/chromeos/sar.c @@ -0,0 +1,82 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2016 Intel Corp. + * + * 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 <console/console.h> +#include <types.h> +#include <string.h> +#include <sar.h> +#include "cros_vpd.h" + +/* + * Decode string representation of the SAR limits (a string of hex symbols) + * into binary. 'key_name' is the name of the VPD field, it's used if + * it is necessary to report an input data format problem. + */ +static void decode_sar_limit(struct wifi_sar_limit_t *sar_limits, + const char *sar_limit_str, + const char *key_name) +{ + int i; + size_t size = sizeof(struct wifi_sar_limit_t) / sizeof(uint8_t); + + for (i = 0; i < size; i++) { + int j; + int n = 0; + + for (j = 0; j < 2; j++) { + char c = sar_limit_str[i * 2 + j]; + if (isxdigit(c)) { + if (isdigit(c)) + c = c - '0'; + else + c = tolower(c) - 'a' + 10; + } else { + printk(BIOS_ERR, "%s: non hexadecimal symbol " + "%#2.2x in the VPD field %s:%s\n", + __func__, (uint8_t)c, key_name, + sar_limit_str); + } + n <<= 4; + n |= c; + } + sar_limits->sar_limit[i] = n; + } +} + +/* Retrieve the wifi SAR limits from VPD and decode it */ +void wifi_sar_limits(struct wifi_sar_limit_t *sar_limits) +{ + const char *wifi_sar_limit_key = CROS_VPD_WIFI_SAR_NAME; + /* + * cros_vpd_gets() reads in one less than size characters from the VPD + * with a terminating null byte ('\0') stored as the last character into + * the buffer, thus the increasing by 1 for buffer_size. + */ + const size_t buffer_size = (sizeof(struct wifi_sar_limit_t) / + sizeof(uint8_t)) * 2 + 1; + char wifi_sar_limit_str[buffer_size]; + + /* Try to read the SAR limit entry from VPD */ + if (!cros_vpd_gets(wifi_sar_limit_key, wifi_sar_limit_str, + ARRAY_SIZE(wifi_sar_limit_str))) { + printk(BIOS_DEBUG, + "Error: Could not locate '%s' in VPD\n", + wifi_sar_limit_key); + return; + } + printk(BIOS_ERR, "VPD wifi_sar = %s\n", wifi_sar_limit_str); + + /* Decode the heximal encoded string to binary values */ + decode_sar_limit(sar_limits, wifi_sar_limit_str, wifi_sar_limit_key); +}