FreeBSD/Linux Kernel Cross Reference
sys/dev/ath/if_ath_btcoex.c

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright (c) 2013 Adrian Chadd <adrian@FreeBSD.org>
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer,
     *    without modification.
     * 2. Redistributions in binary form must reproduce at minimum a disclaimer
     *    similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any
     *    redistribution must be conditioned upon including a substantially
     *    similar Disclaimer requirement for further binary redistribution.
     *
     * NO WARRANTY
     * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     * LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY
     * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
     * THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY,
     * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
     * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
     * THE POSSIBILITY OF SUCH DAMAGES.
     *
     * $FreeBSD$
     */
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    /*
     * This implements some very basic bluetooth coexistence methods for
     * the ath(4) hardware.
     */
    #include "opt_ath.h"
    #include "opt_inet.h"
    #include "opt_wlan.h"
    
    #include <sys/param.h>
    #include <sys/systm.h> 
    #include <sys/sysctl.h>
    #include <sys/kernel.h>
    #include <sys/lock.h>
    #include <sys/malloc.h>
    #include <sys/mutex.h>
    #include <sys/errno.h>
    #include <machine/bus.h>
    #include <machine/resource.h>
    
    #include <sys/bus.h>
    
    #include <sys/socket.h>
    
    #include <net/if.h>
    #include <net/if_var.h>
    #include <net/if_media.h>
    #include <net/if_arp.h>
    #include <net/ethernet.h>               /* XXX for ether_sprintf */
    
    #include <net80211/ieee80211_var.h>
    
    #include <net/bpf.h>
    
    #ifdef INET
    #include <netinet/in.h>
    #include <netinet/if_ether.h>
    #endif
    
    #include <dev/ath/if_athvar.h>
    #include <dev/ath/if_ath_btcoex.h>
    #include <dev/ath/if_ath_btcoex_mci.h>
    
    MALLOC_DECLARE(M_ATHDEV);
    
    /*
     * Initial AR9285 / (WB195) bluetooth coexistence settings,
     * just for experimentation.
     *
     * Return 0 for OK; errno for error.
     *
     * XXX TODO: There needs to be a PCIe workaround to disable ASPM if
     * bluetooth coexistence is enabled.
     */
    static int
    ath_btcoex_cfg_wb195(struct ath_softc *sc)
    {
            HAL_BT_COEX_INFO btinfo;
            HAL_BT_COEX_CONFIG btconfig;
            struct ath_hal *ah = sc->sc_ah;
    
            if (! ath_hal_btcoex_supported(ah))
                    return (EINVAL);
    
            bzero(&btinfo, sizeof(btinfo));
           bzero(&btconfig, sizeof(btconfig));
   
           device_printf(sc->sc_dev, "Enabling WB195 BTCOEX\n");
   
           btinfo.bt_module = HAL_BT_MODULE_JANUS;
           btinfo.bt_coex_config = HAL_BT_COEX_CFG_3WIRE;
           /*
            * These are the three GPIO pins hooked up between the AR9285 and
            * the AR3011.
            */
           btinfo.bt_gpio_bt_active = 6;
           btinfo.bt_gpio_bt_priority = 7;
           btinfo.bt_gpio_wlan_active = 5;
           btinfo.bt_active_polarity = 1;  /* XXX not used */
           btinfo.bt_single_ant = 1;       /* 1 antenna on ar9285 ? */
           btinfo.bt_isolation = 0;        /* in dB, not used */
   
           ath_hal_btcoex_set_info(ah, &btinfo);
   
           btconfig.bt_time_extend = 0;
           btconfig.bt_txstate_extend = 1; /* true */
           btconfig.bt_txframe_extend = 1; /* true */
           btconfig.bt_mode = HAL_BT_COEX_MODE_SLOTTED;
           btconfig.bt_quiet_collision = 1;        /* true */
           btconfig.bt_rxclear_polarity = 1;       /* true */
           btconfig.bt_priority_time = 2;
           btconfig.bt_first_slot_time = 5;
           btconfig.bt_hold_rxclear = 1;   /* true */
   
           ath_hal_btcoex_set_config(ah, &btconfig);
   
           /*
            * Enable antenna diversity.
            */
           ath_hal_btcoex_set_parameter(ah, HAL_BT_COEX_ANTENNA_DIVERSITY, 1);
   
           return (0);
   }
   
   /*
    * Initial AR9485 / (WB225) bluetooth coexistence settings,
    * just for experimentation.
    *
    * Return 0 for OK; errno for error.
    */
   static int
   ath_btcoex_cfg_wb225(struct ath_softc *sc)
   {
           HAL_BT_COEX_INFO btinfo;
           HAL_BT_COEX_CONFIG btconfig;
           struct ath_hal *ah = sc->sc_ah;
   
           if (! ath_hal_btcoex_supported(ah))
                   return (EINVAL);
   
           bzero(&btinfo, sizeof(btinfo));
           bzero(&btconfig, sizeof(btconfig));
   
           device_printf(sc->sc_dev, "Enabling WB225 BTCOEX\n");
   
           btinfo.bt_module = HAL_BT_MODULE_JANUS; /* XXX not used? */
           btinfo.bt_coex_config = HAL_BT_COEX_CFG_3WIRE;
           /*
            * These are the three GPIO pins hooked up between the AR9485 and
            * the bluetooth module.
            */
           btinfo.bt_gpio_bt_active = 4;
           btinfo.bt_gpio_bt_priority = 8;
           btinfo.bt_gpio_wlan_active = 5;
   
           btinfo.bt_active_polarity = 1;  /* XXX not used */
           btinfo.bt_single_ant = 1;       /* 1 antenna on ar9285 ? */
           btinfo.bt_isolation = 0;        /* in dB, not used */
   
           ath_hal_btcoex_set_info(ah, &btinfo);
   
           btconfig.bt_time_extend = 0;
           btconfig.bt_txstate_extend = 1; /* true */
           btconfig.bt_txframe_extend = 1; /* true */
           btconfig.bt_mode = HAL_BT_COEX_MODE_SLOTTED;
           btconfig.bt_quiet_collision = 1;        /* true */
           btconfig.bt_rxclear_polarity = 1;       /* true */
           btconfig.bt_priority_time = 2;
           btconfig.bt_first_slot_time = 5;
           btconfig.bt_hold_rxclear = 1;   /* true */
   
           ath_hal_btcoex_set_config(ah, &btconfig);
   
           /*
            * Enable antenna diversity.
            */
           ath_hal_btcoex_set_parameter(ah, HAL_BT_COEX_ANTENNA_DIVERSITY, 1);
   
           return (0);
   }
   
   static int
   ath_btcoex_cfg_mci(struct ath_softc *sc, uint32_t mci_cfg, int do_btdiv)
   {
           HAL_BT_COEX_INFO btinfo;
           HAL_BT_COEX_CONFIG btconfig;
           struct ath_hal *ah = sc->sc_ah;
   
           if (! ath_hal_btcoex_supported(ah))
                   return (EINVAL);
   
           bzero(&btinfo, sizeof(btinfo));
           bzero(&btconfig, sizeof(btconfig));
   
           sc->sc_ah->ah_config.ath_hal_mci_config = mci_cfg;
   
           if (ath_btcoex_mci_attach(sc) != 0) {
                   device_printf(sc->sc_dev, "Failed to setup btcoex\n");
                   return (EINVAL);
           }
   
           btinfo.bt_module = HAL_BT_MODULE_JANUS; /* XXX not used? */
           btinfo.bt_coex_config = HAL_BT_COEX_CFG_MCI;
   
           /*
            * MCI uses a completely different interface to speak
            * to the bluetooth module - it's a command based
            * thing over a serial line, rather than
            * state pins to/from the bluetooth module.
            *
            * So, the GPIO configuration, polarity, etc
            * doesn't matter on MCI devices; it's just
            * completely ignored by the HAL.
            */
           btinfo.bt_gpio_bt_active = 4;
           btinfo.bt_gpio_bt_priority = 8;
           btinfo.bt_gpio_wlan_active = 5;
   
           btinfo.bt_active_polarity = 1;  /* XXX not used */
           btinfo.bt_single_ant = 0;       /* 2 antenna on WB335 */
           btinfo.bt_isolation = 0;        /* in dB, not used */
   
           ath_hal_btcoex_set_info(ah, &btinfo);
   
           btconfig.bt_time_extend = 0;
           btconfig.bt_txstate_extend = 1; /* true */
           btconfig.bt_txframe_extend = 1; /* true */
           btconfig.bt_mode = HAL_BT_COEX_MODE_SLOTTED;
           btconfig.bt_quiet_collision = 1;        /* true */
           btconfig.bt_rxclear_polarity = 1;       /* true */
           btconfig.bt_priority_time = 2;
           btconfig.bt_first_slot_time = 5;
           btconfig.bt_hold_rxclear = 1;   /* true */
   
           ath_hal_btcoex_set_config(ah, &btconfig);
   
           /* Enable */
           ath_hal_btcoex_enable(sc->sc_ah);
   
           /* Stomp */
           ath_hal_btcoex_set_weights(ah, HAL_BT_COEX_STOMP_NONE);
   
           /*
            * Enable antenna diversity.
            */
           ath_hal_btcoex_set_parameter(ah, HAL_BT_COEX_ANTENNA_DIVERSITY,
               do_btdiv);
   
           return (0);
   }
   
   /*
    * Initial AR9462 / (WB222) bluetooth coexistence settings.
    *
    * Return 0 for OK; errno for error.
    */
   static int
   ath_btcoex_cfg_wb222(struct ath_softc *sc)
   {
   
           device_printf(sc->sc_dev, "Enabling WB222 BTCOEX\n");
           /* XXX from ath9k */
           return (ath_btcoex_cfg_mci(sc, 0x2201, 1));
   }
   
   /*
    * Initial QCA9565 / (WB335B) bluetooth coexistence settings.
    *
    * Return 0 for OK; errno for error.
    */
   static int
   ath_btcoex_cfg_wb335b(struct ath_softc *sc)
   {
           uint32_t flags;
           int do_btdiv = 0;
   
           /* ath9k default */
           flags = 0xa4c1;
   
           /* 1-ant and 2-ant AR9565 */
           /*
            * XXX TODO: ensure these actually make it down to the
            * HAL correctly!
            */
           if (sc->sc_pci_devinfo & ATH_PCI_AR9565_1ANT) {
                   flags &= ~ATH_MCI_CONFIG_ANT_ARCH;
                   flags |= ATH_MCI_ANT_ARCH_1_ANT_PA_LNA_SHARED <<
                       ATH_MCI_CONFIG_ANT_ARCH_S;
           } else if (sc->sc_pci_devinfo & ATH_PCI_AR9565_2ANT) {
                   flags &= ~ATH_MCI_CONFIG_ANT_ARCH;
                   flags |= ATH_MCI_ANT_ARCH_2_ANT_PA_LNA_NON_SHARED <<
                       ATH_MCI_CONFIG_ANT_ARCH_S;
           }
   
           if (sc->sc_pci_devinfo & ATH_PCI_BT_ANT_DIV) {
                   do_btdiv = 1;
           }
   
           device_printf(sc->sc_dev, "Enabling WB335 BTCOEX\n");
           /* XXX from ath9k */
           return (ath_btcoex_cfg_mci(sc, flags, do_btdiv));
   }
   
   #if 0
   /*
    * When using bluetooth coexistence, ASPM needs to be disabled
    * otherwise the sleeping interferes with the bluetooth (USB)
    * operation and the MAC sleep/wakeup hardware.
    *
    * The PCIe powersave routine also needs to not be called
    * by the driver during suspend/resume, else things will get
    * a little odd.  Check Linux ath9k for more details.
    */
   static int
   ath_btcoex_aspm_wb195(struct ath_softc *sc)
   {
   
           /* XXX TODO: clear device ASPM L0S and L1 */
           /* XXX TODO: clear _parent_ ASPM L0S and L1 */
   }
   #endif
   
   /*
    * Methods which are required
    */
   
   /*
    * Attach btcoex to the given interface
    */
   int
   ath_btcoex_attach(struct ath_softc *sc)
   {
           int ret;
           struct ath_hal *ah = sc->sc_ah;
           const char *profname;
   
           /*
            * No chipset bluetooth coexistence? Then do nothing.
            */
           if (! ath_hal_btcoex_supported(ah))
                   return (0);
   
           /*
            * Look at the hints to determine which bluetooth
            * profile to configure.
            */
           ret = resource_string_value(device_get_name(sc->sc_dev),
               device_get_unit(sc->sc_dev),
               "btcoex_profile",
               &profname);
           if (ret != 0) {
                   /* nothing to do */
                   return (0);
           }
   
           if (strncmp(profname, "wb195", 5) == 0) {
                   ret = ath_btcoex_cfg_wb195(sc);
           } else if (strncmp(profname, "wb222", 5) == 0) {
                   ret = ath_btcoex_cfg_wb222(sc);
           } else if (strncmp(profname, "wb225", 5) == 0) {
                   ret = ath_btcoex_cfg_wb225(sc);
           } else if (strncmp(profname, "wb335", 5) == 0) {
                   ret = ath_btcoex_cfg_wb335b(sc);
           } else {
                   return (0);
           }
   
           /*
            * Propagate up failure from the actual attach phase.
            */
           if (ret != 0)
                   return (ret);
   
           return (0);
   }
   
   /*
    * Detach btcoex from the given interface
    */
   int
   ath_btcoex_detach(struct ath_softc *sc)
   {
           if (sc->sc_btcoex_mci) {
                   ath_btcoex_mci_detach(sc);
           }
   
           return (0);
   }
   
   /*
    * Configure or disable bluetooth coexistence on the given channel.
    *
    * For AR9285/AR9287/AR9485, we'll never see a 5GHz channel, so we just
    * assume bluetooth coexistence is always on.
    *
    * For AR9462, we may see a 5GHz channel; bluetooth coexistence should
    * not be enabled on those channels.
    */
   int
   ath_btcoex_enable(struct ath_softc *sc, const struct ieee80211_channel *chan)
   {
           if (sc->sc_btcoex_mci) {
                   ath_btcoex_mci_enable(sc, chan);
           }
   
           return (0);
   }
   
   /*
    * Handle ioctl requests from the diagnostic interface.
    *
    * The initial part of this code resembles ath_ioctl_diag();
    * it's likely a good idea to reduce duplication between
    * these two routines.
    */
   int
   ath_btcoex_ioctl(struct ath_softc *sc, struct ath_diag *ad)
   {
           unsigned int id = ad->ad_id & ATH_DIAG_ID;
           void *indata = NULL;
           void *outdata = NULL;
           u_int32_t insize = ad->ad_in_size;
           u_int32_t outsize = ad->ad_out_size;
           int error = 0;
   //      int val;
   
           if (ad->ad_id & ATH_DIAG_IN) {
                   /*
                    * Copy in data.
                    */
                   indata = malloc(insize, M_TEMP, M_NOWAIT);
                   if (indata == NULL) {
                           error = ENOMEM;
                           goto bad;
                   }
                   error = copyin(ad->ad_in_data, indata, insize);
                   if (error)
                           goto bad;
           }
           if (ad->ad_id & ATH_DIAG_DYN) {
                   /*
                    * Allocate a buffer for the results (otherwise the HAL
                    * returns a pointer to a buffer where we can read the
                    * results).  Note that we depend on the HAL leaving this
                    * pointer for us to use below in reclaiming the buffer;
                    * may want to be more defensive.
                    */
                   outdata = malloc(outsize, M_TEMP, M_NOWAIT | M_ZERO);
                   if (outdata == NULL) {
                           error = ENOMEM;
                           goto bad;
                   }
           }
           switch (id) {
                   default:
                           error = EINVAL;
                           goto bad;
           }
           if (outsize < ad->ad_out_size)
                   ad->ad_out_size = outsize;
           if (outdata && copyout(outdata, ad->ad_out_data, ad->ad_out_size))
                   error = EFAULT;
   bad:
           if ((ad->ad_id & ATH_DIAG_IN) && indata != NULL)
                   free(indata, M_TEMP);
           if ((ad->ad_id & ATH_DIAG_DYN) && outdata != NULL)
                   free(outdata, M_TEMP);
           return (error);
   }

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