/**
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******************************************************************************
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*
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* @file rwnx_bfmer.c
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*
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* @brief VHT Beamformer function definitions
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*
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* Copyright (C) RivieraWaves 2016-2019
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*
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******************************************************************************
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*/
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/**
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* INCLUDE FILES
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******************************************************************************
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*/
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#include <linux/slab.h>
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#include "rwnx_bfmer.h"
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/**
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* FUNCTION DEFINITIONS
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******************************************************************************
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*/
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int rwnx_bfmer_report_add(struct rwnx_hw *rwnx_hw, struct rwnx_sta *rwnx_sta,
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unsigned int length)
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{
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gfp_t flags;
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struct rwnx_bfmer_report *bfm_report ;
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if (in_softirq())
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flags = GFP_ATOMIC;
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else
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flags = GFP_KERNEL;
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/* Allocate a structure that will contain the beamforming report */
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bfm_report = kmalloc(sizeof(*bfm_report) + length, flags);
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/* Check report allocation */
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if (!bfm_report) {
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/* Do not use beamforming */
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return -1;
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}
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/* Store report length */
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bfm_report->length = length;
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/*
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* Need to provide a Virtual Address to the MAC so that it can
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* upload the received Beamforming Report in driver memory
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*/
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bfm_report->dma_addr = dma_map_single(rwnx_hw->dev, &bfm_report->report[0],
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length, DMA_FROM_DEVICE);
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/* Check DMA mapping result */
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if (dma_mapping_error(rwnx_hw->dev, bfm_report->dma_addr)) {
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/* Free allocated report */
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kfree(bfm_report);
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/* And leave */
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return -1;
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}
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/* Store report structure */
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rwnx_sta->bfm_report = bfm_report;
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return 0;
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}
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void rwnx_bfmer_report_del(struct rwnx_hw *rwnx_hw, struct rwnx_sta *rwnx_sta)
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{
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/* Verify if a report has been allocated */
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if (rwnx_sta->bfm_report) {
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struct rwnx_bfmer_report *bfm_report = rwnx_sta->bfm_report;
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/* Unmap DMA region */
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dma_unmap_single(rwnx_hw->dev, bfm_report->dma_addr,
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bfm_report->length, DMA_BIDIRECTIONAL);
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/* Free allocated report structure and clean the pointer */
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kfree(bfm_report);
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rwnx_sta->bfm_report = NULL;
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}
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}
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#ifdef CONFIG_RWNX_FULLMAC
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u8 rwnx_bfmer_get_rx_nss(const struct ieee80211_vht_cap *vht_capa)
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{
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int i;
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u8 rx_nss = 0;
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u16 rx_mcs_map = le16_to_cpu(vht_capa->supp_mcs.rx_mcs_map);
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for (i = 7; i >= 0; i--) {
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u8 mcs = (rx_mcs_map >> (2 * i)) & 3;
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if (mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED) {
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rx_nss = i + 1;
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break;
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}
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}
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return rx_nss;
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}
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#endif /* CONFIG_RWNX_FULLMAC */
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