496 lines
13 KiB
C
496 lines
13 KiB
C
/*
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* Copyright (c) 2013 Broadcom Corporation
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
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* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <linux/slab.h>
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#include <linux/netdevice.h>
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#include <net/cfg80211.h>
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#include <brcmu_wifi.h>
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#include <brcmu_utils.h>
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#include <defs.h>
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#include "core.h"
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#include "debug.h"
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#include "fwil.h"
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#include "fwil_types.h"
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#include "btcoex.h"
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#include "p2p.h"
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#include "cfg80211.h"
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/* T1 start SCO/eSCO priority suppression */
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#define BRCMF_BTCOEX_OPPR_WIN_TIME msecs_to_jiffies(2000)
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/* BT registers values during DHCP */
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#define BRCMF_BT_DHCP_REG50 0x8022
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#define BRCMF_BT_DHCP_REG51 0
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#define BRCMF_BT_DHCP_REG64 0
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#define BRCMF_BT_DHCP_REG65 0
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#define BRCMF_BT_DHCP_REG71 0
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#define BRCMF_BT_DHCP_REG66 0x2710
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#define BRCMF_BT_DHCP_REG41 0x33
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#define BRCMF_BT_DHCP_REG68 0x190
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/* number of samples for SCO detection */
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#define BRCMF_BT_SCO_SAMPLES 12
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/**
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* enum brcmf_btcoex_state - BT coex DHCP state machine states
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* @BRCMF_BT_DHCP_IDLE: DCHP is idle
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* @BRCMF_BT_DHCP_START: DHCP started, wait before
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* boosting wifi priority
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* @BRCMF_BT_DHCP_OPPR_WIN: graceful DHCP opportunity ended,
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* boost wifi priority
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* @BRCMF_BT_DHCP_FLAG_FORCE_TIMEOUT: wifi priority boost end,
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* restore defaults
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*/
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enum brcmf_btcoex_state {
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BRCMF_BT_DHCP_IDLE,
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BRCMF_BT_DHCP_START,
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BRCMF_BT_DHCP_OPPR_WIN,
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BRCMF_BT_DHCP_FLAG_FORCE_TIMEOUT
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};
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/**
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* struct brcmf_btcoex_info - BT coex related information
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* @vif: interface for which request was done.
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* @timer: timer for DHCP state machine
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* @timeout: configured timeout.
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* @timer_on: DHCP timer active
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* @dhcp_done: DHCP finished before T1/T2 timer expiration
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* @bt_state: DHCP state machine state
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* @work: DHCP state machine work
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* @cfg: driver private data for cfg80211 interface
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* @reg66: saved value of btc_params 66
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* @reg41: saved value of btc_params 41
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* @reg68: saved value of btc_params 68
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* @saved_regs_part1: flag indicating regs 66,41,68
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* have been saved
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* @reg51: saved value of btc_params 51
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* @reg64: saved value of btc_params 64
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* @reg65: saved value of btc_params 65
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* @reg71: saved value of btc_params 71
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* @saved_regs_part1: flag indicating regs 50,51,64,65,71
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* have been saved
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*/
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struct brcmf_btcoex_info {
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struct brcmf_cfg80211_vif *vif;
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struct timer_list timer;
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u16 timeout;
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bool timer_on;
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bool dhcp_done;
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enum brcmf_btcoex_state bt_state;
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struct work_struct work;
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struct brcmf_cfg80211_info *cfg;
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u32 reg66;
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u32 reg41;
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u32 reg68;
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bool saved_regs_part1;
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u32 reg50;
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u32 reg51;
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u32 reg64;
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u32 reg65;
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u32 reg71;
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bool saved_regs_part2;
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};
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/**
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* brcmf_btcoex_params_write() - write btc_params firmware variable
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* @ifp: interface
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* @addr: btc_params register number
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* @data: data to write
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*/
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static s32 brcmf_btcoex_params_write(struct brcmf_if *ifp, u32 addr, u32 data)
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{
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struct {
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__le32 addr;
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__le32 data;
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} reg_write;
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reg_write.addr = cpu_to_le32(addr);
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reg_write.data = cpu_to_le32(data);
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return brcmf_fil_iovar_data_set(ifp, "btc_params",
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®_write, sizeof(reg_write));
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}
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/**
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* brcmf_btcoex_params_read() - read btc_params firmware variable
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* @ifp: interface
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* @addr: btc_params register number
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* @data: read data
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*/
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static s32 brcmf_btcoex_params_read(struct brcmf_if *ifp, u32 addr, u32 *data)
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{
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*data = addr;
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return brcmf_fil_iovar_int_get(ifp, "btc_params", data);
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}
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/**
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* brcmf_btcoex_boost_wifi() - control BT SCO/eSCO parameters
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* @btci: BT coex info
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* @trump_sco:
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* true - set SCO/eSCO parameters for compatibility
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* during DHCP window
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* false - restore saved parameter values
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*
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* Enhanced BT COEX settings for eSCO compatibility during DHCP window
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*/
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static void brcmf_btcoex_boost_wifi(struct brcmf_btcoex_info *btci,
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bool trump_sco)
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{
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struct brcmf_if *ifp = brcmf_get_ifp(btci->cfg->pub, 0);
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if (trump_sco && !btci->saved_regs_part2) {
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/* this should reduce eSCO agressive
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* retransmit w/o breaking it
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*/
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/* save current */
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brcmf_dbg(INFO, "new SCO/eSCO coex algo {save & override}\n");
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brcmf_btcoex_params_read(ifp, 50, &btci->reg50);
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brcmf_btcoex_params_read(ifp, 51, &btci->reg51);
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brcmf_btcoex_params_read(ifp, 64, &btci->reg64);
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brcmf_btcoex_params_read(ifp, 65, &btci->reg65);
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brcmf_btcoex_params_read(ifp, 71, &btci->reg71);
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btci->saved_regs_part2 = true;
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brcmf_dbg(INFO,
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"saved bt_params[50,51,64,65,71]: 0x%x 0x%x 0x%x 0x%x 0x%x\n",
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btci->reg50, btci->reg51, btci->reg64,
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btci->reg65, btci->reg71);
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/* pacify the eSco */
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brcmf_btcoex_params_write(ifp, 50, BRCMF_BT_DHCP_REG50);
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brcmf_btcoex_params_write(ifp, 51, BRCMF_BT_DHCP_REG51);
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brcmf_btcoex_params_write(ifp, 64, BRCMF_BT_DHCP_REG64);
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brcmf_btcoex_params_write(ifp, 65, BRCMF_BT_DHCP_REG65);
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brcmf_btcoex_params_write(ifp, 71, BRCMF_BT_DHCP_REG71);
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} else if (btci->saved_regs_part2) {
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/* restore previously saved bt params */
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brcmf_dbg(INFO, "Do new SCO/eSCO coex algo {restore}\n");
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brcmf_btcoex_params_write(ifp, 50, btci->reg50);
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brcmf_btcoex_params_write(ifp, 51, btci->reg51);
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brcmf_btcoex_params_write(ifp, 64, btci->reg64);
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brcmf_btcoex_params_write(ifp, 65, btci->reg65);
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brcmf_btcoex_params_write(ifp, 71, btci->reg71);
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brcmf_dbg(INFO,
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"restored bt_params[50,51,64,65,71]: 0x%x 0x%x 0x%x 0x%x 0x%x\n",
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btci->reg50, btci->reg51, btci->reg64,
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btci->reg65, btci->reg71);
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btci->saved_regs_part2 = false;
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} else {
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brcmf_dbg(INFO, "attempted to restore not saved BTCOEX params\n");
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}
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}
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/**
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* brcmf_btcoex_is_sco_active() - check if SCO/eSCO is active
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* @ifp: interface
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*
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* return: true if SCO/eSCO session is active
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*/
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static bool brcmf_btcoex_is_sco_active(struct brcmf_if *ifp)
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{
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int ioc_res = 0;
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bool res = false;
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int sco_id_cnt = 0;
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u32 param27;
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int i;
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for (i = 0; i < BRCMF_BT_SCO_SAMPLES; i++) {
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ioc_res = brcmf_btcoex_params_read(ifp, 27, ¶m27);
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if (ioc_res < 0) {
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brcmf_err("ioc read btc params error\n");
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break;
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}
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brcmf_dbg(INFO, "sample[%d], btc_params 27:%x\n", i, param27);
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if ((param27 & 0x6) == 2) { /* count both sco & esco */
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sco_id_cnt++;
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}
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if (sco_id_cnt > 2) {
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brcmf_dbg(INFO,
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"sco/esco detected, pkt id_cnt:%d samples:%d\n",
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sco_id_cnt, i);
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res = true;
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break;
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}
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}
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brcmf_dbg(TRACE, "exit: result=%d\n", res);
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return res;
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}
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/**
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* btcmf_btcoex_save_part1() - save first step parameters.
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*/
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static void btcmf_btcoex_save_part1(struct brcmf_btcoex_info *btci)
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{
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struct brcmf_if *ifp = btci->vif->ifp;
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if (!btci->saved_regs_part1) {
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/* Retrieve and save original reg value */
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brcmf_btcoex_params_read(ifp, 66, &btci->reg66);
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brcmf_btcoex_params_read(ifp, 41, &btci->reg41);
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brcmf_btcoex_params_read(ifp, 68, &btci->reg68);
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btci->saved_regs_part1 = true;
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brcmf_dbg(INFO,
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"saved btc_params regs (66,41,68) 0x%x 0x%x 0x%x\n",
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btci->reg66, btci->reg41,
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btci->reg68);
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}
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}
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/**
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* brcmf_btcoex_restore_part1() - restore first step parameters.
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*/
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static void brcmf_btcoex_restore_part1(struct brcmf_btcoex_info *btci)
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{
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struct brcmf_if *ifp;
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if (btci->saved_regs_part1) {
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btci->saved_regs_part1 = false;
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ifp = btci->vif->ifp;
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brcmf_btcoex_params_write(ifp, 66, btci->reg66);
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brcmf_btcoex_params_write(ifp, 41, btci->reg41);
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brcmf_btcoex_params_write(ifp, 68, btci->reg68);
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brcmf_dbg(INFO,
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"restored btc_params regs {66,41,68} 0x%x 0x%x 0x%x\n",
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btci->reg66, btci->reg41,
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btci->reg68);
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}
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}
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/**
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* brcmf_btcoex_timerfunc() - BT coex timer callback
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*/
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static void brcmf_btcoex_timerfunc(ulong data)
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{
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struct brcmf_btcoex_info *bt_local = (struct brcmf_btcoex_info *)data;
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brcmf_dbg(TRACE, "enter\n");
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bt_local->timer_on = false;
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schedule_work(&bt_local->work);
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}
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/**
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* brcmf_btcoex_handler() - BT coex state machine work handler
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* @work: work
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*/
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static void brcmf_btcoex_handler(struct work_struct *work)
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{
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struct brcmf_btcoex_info *btci;
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btci = container_of(work, struct brcmf_btcoex_info, work);
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if (btci->timer_on) {
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btci->timer_on = false;
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del_timer_sync(&btci->timer);
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}
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switch (btci->bt_state) {
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case BRCMF_BT_DHCP_START:
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/* DHCP started provide OPPORTUNITY window
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to get DHCP address
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*/
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brcmf_dbg(INFO, "DHCP started\n");
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btci->bt_state = BRCMF_BT_DHCP_OPPR_WIN;
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if (btci->timeout < BRCMF_BTCOEX_OPPR_WIN_TIME) {
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mod_timer(&btci->timer, btci->timer.expires);
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} else {
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btci->timeout -= BRCMF_BTCOEX_OPPR_WIN_TIME;
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mod_timer(&btci->timer,
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jiffies + BRCMF_BTCOEX_OPPR_WIN_TIME);
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}
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btci->timer_on = true;
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break;
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case BRCMF_BT_DHCP_OPPR_WIN:
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if (btci->dhcp_done) {
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brcmf_dbg(INFO, "DHCP done before T1 expiration\n");
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goto idle;
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}
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/* DHCP is not over yet, start lowering BT priority */
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brcmf_dbg(INFO, "DHCP T1:%d expired\n",
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jiffies_to_msecs(BRCMF_BTCOEX_OPPR_WIN_TIME));
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brcmf_btcoex_boost_wifi(btci, true);
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btci->bt_state = BRCMF_BT_DHCP_FLAG_FORCE_TIMEOUT;
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mod_timer(&btci->timer, jiffies + btci->timeout);
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btci->timer_on = true;
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break;
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case BRCMF_BT_DHCP_FLAG_FORCE_TIMEOUT:
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if (btci->dhcp_done)
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brcmf_dbg(INFO, "DHCP done before T2 expiration\n");
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else
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brcmf_dbg(INFO, "DHCP T2:%d expired\n",
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BRCMF_BT_DHCP_FLAG_FORCE_TIMEOUT);
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goto idle;
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default:
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brcmf_err("invalid state=%d !!!\n", btci->bt_state);
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goto idle;
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}
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return;
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idle:
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btci->bt_state = BRCMF_BT_DHCP_IDLE;
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btci->timer_on = false;
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brcmf_btcoex_boost_wifi(btci, false);
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cfg80211_crit_proto_stopped(&btci->vif->wdev, GFP_KERNEL);
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brcmf_btcoex_restore_part1(btci);
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btci->vif = NULL;
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}
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/**
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* brcmf_btcoex_attach() - initialize BT coex data
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* @cfg: driver private cfg80211 data
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*
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* return: 0 on success
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*/
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int brcmf_btcoex_attach(struct brcmf_cfg80211_info *cfg)
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{
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struct brcmf_btcoex_info *btci = NULL;
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brcmf_dbg(TRACE, "enter\n");
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btci = kmalloc(sizeof(struct brcmf_btcoex_info), GFP_KERNEL);
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if (!btci)
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return -ENOMEM;
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btci->bt_state = BRCMF_BT_DHCP_IDLE;
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/* Set up timer for BT */
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btci->timer_on = false;
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btci->timeout = BRCMF_BTCOEX_OPPR_WIN_TIME;
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init_timer(&btci->timer);
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btci->timer.data = (ulong)btci;
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btci->timer.function = brcmf_btcoex_timerfunc;
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btci->cfg = cfg;
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btci->saved_regs_part1 = false;
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btci->saved_regs_part2 = false;
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INIT_WORK(&btci->work, brcmf_btcoex_handler);
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cfg->btcoex = btci;
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return 0;
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}
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/**
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* brcmf_btcoex_detach - clean BT coex data
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* @cfg: driver private cfg80211 data
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*/
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void brcmf_btcoex_detach(struct brcmf_cfg80211_info *cfg)
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{
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brcmf_dbg(TRACE, "enter\n");
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if (!cfg->btcoex)
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return;
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if (cfg->btcoex->timer_on) {
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cfg->btcoex->timer_on = false;
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del_timer_sync(&cfg->btcoex->timer);
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}
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cancel_work_sync(&cfg->btcoex->work);
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brcmf_btcoex_boost_wifi(cfg->btcoex, false);
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brcmf_btcoex_restore_part1(cfg->btcoex);
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kfree(cfg->btcoex);
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cfg->btcoex = NULL;
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}
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static void brcmf_btcoex_dhcp_start(struct brcmf_btcoex_info *btci)
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{
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struct brcmf_if *ifp = btci->vif->ifp;
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btcmf_btcoex_save_part1(btci);
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/* set new regs values */
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brcmf_btcoex_params_write(ifp, 66, BRCMF_BT_DHCP_REG66);
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brcmf_btcoex_params_write(ifp, 41, BRCMF_BT_DHCP_REG41);
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brcmf_btcoex_params_write(ifp, 68, BRCMF_BT_DHCP_REG68);
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btci->dhcp_done = false;
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btci->bt_state = BRCMF_BT_DHCP_START;
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schedule_work(&btci->work);
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brcmf_dbg(TRACE, "enable BT DHCP Timer\n");
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}
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static void brcmf_btcoex_dhcp_end(struct brcmf_btcoex_info *btci)
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{
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/* Stop any bt timer because DHCP session is done */
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btci->dhcp_done = true;
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if (btci->timer_on) {
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brcmf_dbg(INFO, "disable BT DHCP Timer\n");
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btci->timer_on = false;
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del_timer_sync(&btci->timer);
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/* schedule worker if transition to IDLE is needed */
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if (btci->bt_state != BRCMF_BT_DHCP_IDLE) {
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brcmf_dbg(INFO, "bt_state:%d\n",
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btci->bt_state);
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schedule_work(&btci->work);
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}
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} else {
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/* Restore original values */
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brcmf_btcoex_restore_part1(btci);
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}
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}
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/**
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* brcmf_btcoex_set_mode - set BT coex mode
|
|
* @cfg: driver private cfg80211 data
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|
* @mode: Wifi-Bluetooth coexistence mode
|
|
*
|
|
* return: 0 on success
|
|
*/
|
|
int brcmf_btcoex_set_mode(struct brcmf_cfg80211_vif *vif,
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|
enum brcmf_btcoex_mode mode, u16 duration)
|
|
{
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|
struct brcmf_cfg80211_info *cfg = wiphy_priv(vif->wdev.wiphy);
|
|
struct brcmf_btcoex_info *btci = cfg->btcoex;
|
|
struct brcmf_if *ifp = brcmf_get_ifp(cfg->pub, 0);
|
|
|
|
switch (mode) {
|
|
case BRCMF_BTCOEX_DISABLED:
|
|
brcmf_dbg(INFO, "DHCP session starts\n");
|
|
if (btci->bt_state != BRCMF_BT_DHCP_IDLE)
|
|
return -EBUSY;
|
|
/* Start BT timer only for SCO connection */
|
|
if (brcmf_btcoex_is_sco_active(ifp)) {
|
|
btci->timeout = msecs_to_jiffies(duration);
|
|
btci->vif = vif;
|
|
brcmf_btcoex_dhcp_start(btci);
|
|
}
|
|
break;
|
|
|
|
case BRCMF_BTCOEX_ENABLED:
|
|
brcmf_dbg(INFO, "DHCP session ends\n");
|
|
if (btci->bt_state != BRCMF_BT_DHCP_IDLE &&
|
|
vif == btci->vif) {
|
|
brcmf_btcoex_dhcp_end(btci);
|
|
}
|
|
break;
|
|
default:
|
|
brcmf_dbg(INFO, "Unknown mode, ignored\n");
|
|
}
|
|
return 0;
|
|
}
|