--- /dev/null
+/*
+ * 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 <dhd.h>
+#include <dhd_dbg.h>
+#include "fwil.h"
+#include "fwil_types.h"
+#include "btcoex.h"
+#include "p2p.h"
+#include "wl_cfg80211.h"
+
+/* T1 start SCO/eSCO priority suppression */
+#define BRCMF_BTCOEX_OPPR_WIN_TIME 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 = btci->cfg->pub->iflist[0];
+
+ if (trump_sco && !btci->saved_regs_part2) {
+ /* this should reduce eSCO agressive
+ * retransmit w/o breaking it
+ */
+
+ /* save current */
+ brcmf_dbg(TRACE, "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(TRACE,
+ "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(TRACE, "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(TRACE,
+ "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_err("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(TRACE, "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(TRACE,
+ "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(TRACE,
+ "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(TRACE,
+ "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(TRACE, "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 +
+ msecs_to_jiffies(BRCMF_BTCOEX_OPPR_WIN_TIME));
+ }
+ btci->timer_on = true;
+ break;
+
+ case BRCMF_BT_DHCP_OPPR_WIN:
+ if (btci->dhcp_done) {
+ brcmf_dbg(TRACE, "DHCP done before T1 expiration\n");
+ goto idle;
+ }
+
+ /* DHCP is not over yet, start lowering BT priority */
+ brcmf_dbg(TRACE, "DHCP T1:%d expired\n",
+ 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 + msecs_to_jiffies(btci->timeout));
+ btci->timer_on = true;
+ break;
+
+ case BRCMF_BT_DHCP_FLAG_FORCE_TIMEOUT:
+ if (btci->dhcp_done)
+ brcmf_dbg(TRACE, "DHCP done before T2 expiration\n");
+ else
+ brcmf_dbg(TRACE, "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(TRACE, "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(TRACE, "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 = cfg->pub->iflist[0];
+
+ switch (mode) {
+ case BRCMF_BTCOEX_DISABLED:
+ brcmf_dbg(TRACE, "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 = duration;
+ btci->vif = vif;
+ brcmf_btcoex_dhcp_start(btci);
+ }
+ break;
+
+ case BRCMF_BTCOEX_ENABLED:
+ brcmf_dbg(TRACE, "DHCP session ends\n");
+ if (btci->bt_state != BRCMF_BT_DHCP_IDLE &&
+ vif == btci->vif) {
+ brcmf_btcoex_dhcp_end(btci);
+ }
+ break;
+ default:
+ brcmf_dbg(TRACE, "Unknown mode, ignored\n");
+ }
+ return 0;
+}
projects / linux-2.6-microblaze.git / commitdiff