diff options
| -rw-r--r-- | src/include/sar.h | 38 | ||||
| -rw-r--r-- | src/vendorcode/google/chromeos/Makefile.inc | 1 | ||||
| -rw-r--r-- | src/vendorcode/google/chromeos/cros_vpd.h | 1 | ||||
| -rw-r--r-- | src/vendorcode/google/chromeos/sar.c | 60 |
4 files changed, 100 insertions, 0 deletions
diff --git a/src/include/sar.h b/src/include/sar.h new file mode 100644 index 0000000000..4653dd33ae --- /dev/null +++ b/src/include/sar.h @@ -0,0 +1,38 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2017 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> + +#define NUM_SAR_LIMITS 4 +#define BYTES_PER_SAR_LIMIT 10 + +/* Wifi SAR limit table structure */ +struct wifi_sar_limits { + /* Total 4 SAR limit sets, each has 10 bytes */ + uint8_t sar_limit[NUM_SAR_LIMITS][BYTES_PER_SAR_LIMIT]; +}; + +/* + * Retrieve the SAR limits data from VPD and decode it. + * sar_limits: Pointer to wifi_sar_limits where the resulted data is stored + * + * Returns: 0 on success, -1 on errors (The VPD entry doesn't exist, or the + * VPD entry contains non-heximal value.) + */ +int get_wifi_sar_limits(struct wifi_sar_limits *sar_limits); + +#endif /* _SAR_H_ */ diff --git a/src/vendorcode/google/chromeos/Makefile.inc b/src/vendorcode/google/chromeos/Makefile.inc index e84eb3d231..878b0684c0 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 96ca8af329..1fa56a4725 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 0000000000..2b61e223d5 --- /dev/null +++ b/src/vendorcode/google/chromeos/sar.c @@ -0,0 +1,60 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2017 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" + +/* Retrieve the wifi SAR limits data from VPD and decode it */ +int get_wifi_sar_limits(struct wifi_sar_limits *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_limits) / + sizeof(uint8_t)) * 2 + 1; + char wifi_sar_limit_str[buffer_size]; + uint8_t bin_buffer[sizeof(struct wifi_sar_limits)]; + + /* 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_ERR, + "Error: Could not locate '%s' in VPD\n", + wifi_sar_limit_key); + return -1; + } + printk(BIOS_DEBUG, "VPD wifi_sar = %s\n", wifi_sar_limit_str); + + /* Decode the heximal encoded string to binary values */ + if (hexstrtobin(wifi_sar_limit_str, bin_buffer, + sizeof(struct wifi_sar_limits)) + < sizeof(struct wifi_sar_limits)) { + printk(BIOS_ERR, + "Error: VPD wifi_sar contains non-heximal value!\n"); + return -1; + } + + /* Fill the sar_limits structure with the decoded data */ + for (int i = 0; i < NUM_SAR_LIMITS; i++) + memcpy(sar_limits->sar_limit[i], + &bin_buffer[BYTES_PER_SAR_LIMIT * i], + BYTES_PER_SAR_LIMIT); + return 0; +} |