nexmon – Rev 1
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/*
* Copyright (c) 2013 Broadcom Corporation
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <linux/slab.h>
#include <linux/netdevice.h>
#include <net/cfg80211.h>
#include <brcmu_wifi.h>
#include <brcmu_utils.h>
#include <defs.h>
#include "core.h"
#include "debug.h"
#include "fwil.h"
#include "fwil_types.h"
#include "btcoex.h"
#include "p2p.h"
#include "cfg80211.h"
/* T1 start SCO/eSCO priority suppression */
#define BRCMF_BTCOEX_OPPR_WIN_TIME msecs_to_jiffies(2000)
/* BT registers values during DHCP */
#define BRCMF_BT_DHCP_REG50 0x8022
#define BRCMF_BT_DHCP_REG51 0
#define BRCMF_BT_DHCP_REG64 0
#define BRCMF_BT_DHCP_REG65 0
#define BRCMF_BT_DHCP_REG71 0
#define BRCMF_BT_DHCP_REG66 0x2710
#define BRCMF_BT_DHCP_REG41 0x33
#define BRCMF_BT_DHCP_REG68 0x190
/* number of samples for SCO detection */
#define BRCMF_BT_SCO_SAMPLES 12
/**
* enum brcmf_btcoex_state - BT coex DHCP state machine states
* @BRCMF_BT_DHCP_IDLE: DCHP is idle
* @BRCMF_BT_DHCP_START: DHCP started, wait before
* boosting wifi priority
* @BRCMF_BT_DHCP_OPPR_WIN: graceful DHCP opportunity ended,
* boost wifi priority
* @BRCMF_BT_DHCP_FLAG_FORCE_TIMEOUT: wifi priority boost end,
* restore defaults
*/
enum brcmf_btcoex_state {
BRCMF_BT_DHCP_IDLE,
BRCMF_BT_DHCP_START,
BRCMF_BT_DHCP_OPPR_WIN,
BRCMF_BT_DHCP_FLAG_FORCE_TIMEOUT
};
/**
* struct brcmf_btcoex_info - BT coex related information
* @vif: interface for which request was done.
* @timer: timer for DHCP state machine
* @timeout: configured timeout.
* @timer_on: DHCP timer active
* @dhcp_done: DHCP finished before T1/T2 timer expiration
* @bt_state: DHCP state machine state
* @work: DHCP state machine work
* @cfg: driver private data for cfg80211 interface
* @reg66: saved value of btc_params 66
* @reg41: saved value of btc_params 41
* @reg68: saved value of btc_params 68
* @saved_regs_part1: flag indicating regs 66,41,68
* have been saved
* @reg51: saved value of btc_params 51
* @reg64: saved value of btc_params 64
* @reg65: saved value of btc_params 65
* @reg71: saved value of btc_params 71
* @saved_regs_part1: flag indicating regs 50,51,64,65,71
* have been saved
*/
struct brcmf_btcoex_info {
struct brcmf_cfg80211_vif *vif;
struct timer_list timer;
u16 timeout;
bool timer_on;
bool dhcp_done;
enum brcmf_btcoex_state bt_state;
struct work_struct work;
struct brcmf_cfg80211_info *cfg;
u32 reg66;
u32 reg41;
u32 reg68;
bool saved_regs_part1;
u32 reg50;
u32 reg51;
u32 reg64;
u32 reg65;
u32 reg71;
bool saved_regs_part2;
};
/**
* brcmf_btcoex_params_write() - write btc_params firmware variable
* @ifp: interface
* @addr: btc_params register number
* @data: data to write
*/
static s32 brcmf_btcoex_params_write(struct brcmf_if *ifp, u32 addr, u32 data)
{
struct {
__le32 addr;
__le32 data;
} reg_write;
reg_write.addr = cpu_to_le32(addr);
reg_write.data = cpu_to_le32(data);
return brcmf_fil_iovar_data_set(ifp, "btc_params",
®_write, sizeof(reg_write));
}
/**
* brcmf_btcoex_params_read() - read btc_params firmware variable
* @ifp: interface
* @addr: btc_params register number
* @data: read data
*/
static s32 brcmf_btcoex_params_read(struct brcmf_if *ifp, u32 addr, u32 *data)
{
*data = addr;
return brcmf_fil_iovar_int_get(ifp, "btc_params", data);
}
/**
* brcmf_btcoex_boost_wifi() - control BT SCO/eSCO parameters
* @btci: BT coex info
* @trump_sco:
* true - set SCO/eSCO parameters for compatibility
* during DHCP window
* false - restore saved parameter values
*
* Enhanced BT COEX settings for eSCO compatibility during DHCP window
*/
static void brcmf_btcoex_boost_wifi(struct brcmf_btcoex_info *btci,
bool trump_sco)
{
struct brcmf_if *ifp = brcmf_get_ifp(btci->cfg->pub, 0);
if (trump_sco && !btci->saved_regs_part2) {
/* this should reduce eSCO agressive
* retransmit w/o breaking it
*/
/* save current */
brcmf_dbg(INFO, "new SCO/eSCO coex algo {save & override}\n");
brcmf_btcoex_params_read(ifp, 50, &btci->reg50);
brcmf_btcoex_params_read(ifp, 51, &btci->reg51);
brcmf_btcoex_params_read(ifp, 64, &btci->reg64);
brcmf_btcoex_params_read(ifp, 65, &btci->reg65);
brcmf_btcoex_params_read(ifp, 71, &btci->reg71);
btci->saved_regs_part2 = true;
brcmf_dbg(INFO,
"saved bt_params[50,51,64,65,71]: 0x%x 0x%x 0x%x 0x%x 0x%x\n",
btci->reg50, btci->reg51, btci->reg64,
btci->reg65, btci->reg71);
/* pacify the eSco */
brcmf_btcoex_params_write(ifp, 50, BRCMF_BT_DHCP_REG50);
brcmf_btcoex_params_write(ifp, 51, BRCMF_BT_DHCP_REG51);
brcmf_btcoex_params_write(ifp, 64, BRCMF_BT_DHCP_REG64);
brcmf_btcoex_params_write(ifp, 65, BRCMF_BT_DHCP_REG65);
brcmf_btcoex_params_write(ifp, 71, BRCMF_BT_DHCP_REG71);
} else if (btci->saved_regs_part2) {
/* restore previously saved bt params */
brcmf_dbg(INFO, "Do new SCO/eSCO coex algo {restore}\n");
brcmf_btcoex_params_write(ifp, 50, btci->reg50);
brcmf_btcoex_params_write(ifp, 51, btci->reg51);
brcmf_btcoex_params_write(ifp, 64, btci->reg64);
brcmf_btcoex_params_write(ifp, 65, btci->reg65);
brcmf_btcoex_params_write(ifp, 71, btci->reg71);
brcmf_dbg(INFO,
"restored bt_params[50,51,64,65,71]: 0x%x 0x%x 0x%x 0x%x 0x%x\n",
btci->reg50, btci->reg51, btci->reg64,
btci->reg65, btci->reg71);
btci->saved_regs_part2 = false;
} else {
brcmf_dbg(INFO, "attempted to restore not saved BTCOEX params\n");
}
}
/**
* brcmf_btcoex_is_sco_active() - check if SCO/eSCO is active
* @ifp: interface
*
* return: true if SCO/eSCO session is active
*/
static bool brcmf_btcoex_is_sco_active(struct brcmf_if *ifp)
{
int ioc_res = 0;
bool res = false;
int sco_id_cnt = 0;
u32 param27;
int i;
for (i = 0; i < BRCMF_BT_SCO_SAMPLES; i++) {
ioc_res = brcmf_btcoex_params_read(ifp, 27, ¶m27);
if (ioc_res < 0) {
brcmf_err("ioc read btc params error\n");
break;
}
brcmf_dbg(INFO, "sample[%d], btc_params 27:%x\n", i, param27);
if ((param27 & 0x6) == 2) { /* count both sco & esco */
sco_id_cnt++;
}
if (sco_id_cnt > 2) {
brcmf_dbg(INFO,
"sco/esco detected, pkt id_cnt:%d samples:%d\n",
sco_id_cnt, i);
res = true;
break;
}
}
brcmf_dbg(TRACE, "exit: result=%d\n", res);
return res;
}
/**
* btcmf_btcoex_save_part1() - save first step parameters.
*/
static void btcmf_btcoex_save_part1(struct brcmf_btcoex_info *btci)
{
struct brcmf_if *ifp = btci->vif->ifp;
if (!btci->saved_regs_part1) {
/* Retrieve and save original reg value */
brcmf_btcoex_params_read(ifp, 66, &btci->reg66);
brcmf_btcoex_params_read(ifp, 41, &btci->reg41);
brcmf_btcoex_params_read(ifp, 68, &btci->reg68);
btci->saved_regs_part1 = true;
brcmf_dbg(INFO,
"saved btc_params regs (66,41,68) 0x%x 0x%x 0x%x\n",
btci->reg66, btci->reg41,
btci->reg68);
}
}
/**
* brcmf_btcoex_restore_part1() - restore first step parameters.
*/
static void brcmf_btcoex_restore_part1(struct brcmf_btcoex_info *btci)
{
struct brcmf_if *ifp;
if (btci->saved_regs_part1) {
btci->saved_regs_part1 = false;
ifp = btci->vif->ifp;
brcmf_btcoex_params_write(ifp, 66, btci->reg66);
brcmf_btcoex_params_write(ifp, 41, btci->reg41);
brcmf_btcoex_params_write(ifp, 68, btci->reg68);
brcmf_dbg(INFO,
"restored btc_params regs {66,41,68} 0x%x 0x%x 0x%x\n",
btci->reg66, btci->reg41,
btci->reg68);
}
}
/**
* brcmf_btcoex_timerfunc() - BT coex timer callback
*/
static void brcmf_btcoex_timerfunc(ulong data)
{
struct brcmf_btcoex_info *bt_local = (struct brcmf_btcoex_info *)data;
brcmf_dbg(TRACE, "enter\n");
bt_local->timer_on = false;
schedule_work(&bt_local->work);
}
/**
* brcmf_btcoex_handler() - BT coex state machine work handler
* @work: work
*/
static void brcmf_btcoex_handler(struct work_struct *work)
{
struct brcmf_btcoex_info *btci;
btci = container_of(work, struct brcmf_btcoex_info, work);
if (btci->timer_on) {
btci->timer_on = false;
del_timer_sync(&btci->timer);
}
switch (btci->bt_state) {
case BRCMF_BT_DHCP_START:
/* DHCP started provide OPPORTUNITY window
to get DHCP address
*/
brcmf_dbg(INFO, "DHCP started\n");
btci->bt_state = BRCMF_BT_DHCP_OPPR_WIN;
if (btci->timeout < BRCMF_BTCOEX_OPPR_WIN_TIME) {
mod_timer(&btci->timer, btci->timer.expires);
} else {
btci->timeout -= BRCMF_BTCOEX_OPPR_WIN_TIME;
mod_timer(&btci->timer,
jiffies + BRCMF_BTCOEX_OPPR_WIN_TIME);
}
btci->timer_on = true;
break;
case BRCMF_BT_DHCP_OPPR_WIN:
if (btci->dhcp_done) {
brcmf_dbg(INFO, "DHCP done before T1 expiration\n");
goto idle;
}
/* DHCP is not over yet, start lowering BT priority */
brcmf_dbg(INFO, "DHCP T1:%d expired\n",
jiffies_to_msecs(BRCMF_BTCOEX_OPPR_WIN_TIME));
brcmf_btcoex_boost_wifi(btci, true);
btci->bt_state = BRCMF_BT_DHCP_FLAG_FORCE_TIMEOUT;
mod_timer(&btci->timer, jiffies + btci->timeout);
btci->timer_on = true;
break;
case BRCMF_BT_DHCP_FLAG_FORCE_TIMEOUT:
if (btci->dhcp_done)
brcmf_dbg(INFO, "DHCP done before T2 expiration\n");
else
brcmf_dbg(INFO, "DHCP T2:%d expired\n",
BRCMF_BT_DHCP_FLAG_FORCE_TIMEOUT);
goto idle;
default:
brcmf_err("invalid state=%d !!!\n", btci->bt_state);
goto idle;
}
return;
idle:
btci->bt_state = BRCMF_BT_DHCP_IDLE;
btci->timer_on = false;
brcmf_btcoex_boost_wifi(btci, false);
cfg80211_crit_proto_stopped(&btci->vif->wdev, GFP_KERNEL);
brcmf_btcoex_restore_part1(btci);
btci->vif = NULL;
}
/**
* brcmf_btcoex_attach() - initialize BT coex data
* @cfg: driver private cfg80211 data
*
* return: 0 on success
*/
int brcmf_btcoex_attach(struct brcmf_cfg80211_info *cfg)
{
struct brcmf_btcoex_info *btci = NULL;
brcmf_dbg(TRACE, "enter\n");
btci = kmalloc(sizeof(struct brcmf_btcoex_info), GFP_KERNEL);
if (!btci)
return -ENOMEM;
btci->bt_state = BRCMF_BT_DHCP_IDLE;
/* Set up timer for BT */
btci->timer_on = false;
btci->timeout = BRCMF_BTCOEX_OPPR_WIN_TIME;
init_timer(&btci->timer);
btci->timer.data = (ulong)btci;
btci->timer.function = brcmf_btcoex_timerfunc;
btci->cfg = cfg;
btci->saved_regs_part1 = false;
btci->saved_regs_part2 = false;
INIT_WORK(&btci->work, brcmf_btcoex_handler);
cfg->btcoex = btci;
return 0;
}
/**
* brcmf_btcoex_detach - clean BT coex data
* @cfg: driver private cfg80211 data
*/
void brcmf_btcoex_detach(struct brcmf_cfg80211_info *cfg)
{
brcmf_dbg(TRACE, "enter\n");
if (!cfg->btcoex)
return;
if (cfg->btcoex->timer_on) {
cfg->btcoex->timer_on = false;
del_timer_sync(&cfg->btcoex->timer);
}
cancel_work_sync(&cfg->btcoex->work);
brcmf_btcoex_boost_wifi(cfg->btcoex, false);
brcmf_btcoex_restore_part1(cfg->btcoex);
kfree(cfg->btcoex);
cfg->btcoex = NULL;
}
static void brcmf_btcoex_dhcp_start(struct brcmf_btcoex_info *btci)
{
struct brcmf_if *ifp = btci->vif->ifp;
btcmf_btcoex_save_part1(btci);
/* set new regs values */
brcmf_btcoex_params_write(ifp, 66, BRCMF_BT_DHCP_REG66);
brcmf_btcoex_params_write(ifp, 41, BRCMF_BT_DHCP_REG41);
brcmf_btcoex_params_write(ifp, 68, BRCMF_BT_DHCP_REG68);
btci->dhcp_done = false;
btci->bt_state = BRCMF_BT_DHCP_START;
schedule_work(&btci->work);
brcmf_dbg(TRACE, "enable BT DHCP Timer\n");
}
static void brcmf_btcoex_dhcp_end(struct brcmf_btcoex_info *btci)
{
/* Stop any bt timer because DHCP session is done */
btci->dhcp_done = true;
if (btci->timer_on) {
brcmf_dbg(INFO, "disable BT DHCP Timer\n");
btci->timer_on = false;
del_timer_sync(&btci->timer);
/* schedule worker if transition to IDLE is needed */
if (btci->bt_state != BRCMF_BT_DHCP_IDLE) {
brcmf_dbg(INFO, "bt_state:%d\n",
btci->bt_state);
schedule_work(&btci->work);
}
} else {
/* Restore original values */
brcmf_btcoex_restore_part1(btci);
}
}
/**
* brcmf_btcoex_set_mode - set BT coex mode
* @cfg: driver private cfg80211 data
* @mode: Wifi-Bluetooth coexistence mode
*
* return: 0 on success
*/
int brcmf_btcoex_set_mode(struct brcmf_cfg80211_vif *vif,
enum brcmf_btcoex_mode mode, u16 duration)
{
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;
}