drivers/staging/vt6655/power.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (c) 1996, 2003 VIA Networking Technologies, Inc.
   4  * All rights reserved.
   5  *
   6  * File: power.c
   7  *
   8  * Purpose: Handles 802.11 power management  functions
   9  *
  10  * Author: Lyndon Chen
  11  *
  12  * Date: July 17, 2002
  13  *
  14  * Functions:
  15  *      PSvEnablePowerSaving - Enable Power Saving Mode
  16  *      PSvDiasblePowerSaving - Disable Power Saving Mode
  17  *      PSbConsiderPowerDown - Decide if we can Power Down
  18  *      PSvSendPSPOLL - Send PS-POLL packet
  19  *      PSbSendNullPacket - Send Null packet
  20  *      PSbIsNextTBTTWakeUp - Decide if we need to wake up at next Beacon
  21  *
  22  * Revision History:
  23  *
  24  */
  25
  26 #include "mac.h"
  27 #include "device.h"
  28 #include "power.h"
  29 #include "card.h"
  30
  31 /*---------------------  Static Definitions -------------------------*/
  32
  33 /*---------------------  Static Classes  ----------------------------*/
  34
  35 /*---------------------  Static Functions  --------------------------*/
  36
  37 /*---------------------  Export Variables  --------------------------*/
  38
  39 /*---------------------  Export Functions  --------------------------*/
  40
  41 /*
  42  *
  43  * Routine Description:
  44  * Enable hw power saving functions
  45  *
  46  * Return Value:
  47  *    None.
  48  *
  49  */
  50
  51 void
  52 PSvEnablePowerSaving(
  53         struct vnt_private *priv,
  54         unsigned short wListenInterval
  55 )
  56 {
  57         u16 wAID = priv->current_aid | BIT(14) | BIT(15);
  58
  59         /* set period of power up before TBTT */
  60         VNSvOutPortW(priv->PortOffset + MAC_REG_PWBT, C_PWBT);
  61         if (priv->op_mode != NL80211_IFTYPE_ADHOC) {
  62                 /* set AID */
  63                 VNSvOutPortW(priv->PortOffset + MAC_REG_AIDATIM, wAID);
  64         } else {
  65                 /* set ATIM Window */
  66 #if 0 /* TODO atim window */
  67                 MACvWriteATIMW(priv->PortOffset, pMgmt->wCurrATIMWindow);
  68 #endif
  69         }
  70         /* Set AutoSleep */
  71         MACvRegBitsOn(priv->PortOffset, MAC_REG_PSCFG, PSCFG_AUTOSLEEP);
  72         /* Set HWUTSF */
  73         MACvRegBitsOn(priv->PortOffset, MAC_REG_TFTCTL, TFTCTL_HWUTSF);
  74
  75         if (wListenInterval >= 2) {
  76                 /* clear always listen beacon */
  77                 MACvRegBitsOff(priv->PortOffset, MAC_REG_PSCTL, PSCTL_ALBCN);
  78                 /* first time set listen next beacon */
  79                 MACvRegBitsOn(priv->PortOffset, MAC_REG_PSCTL, PSCTL_LNBCN);
  80         } else {
  81                 /* always listen beacon */
  82                 MACvRegBitsOn(priv->PortOffset, MAC_REG_PSCTL, PSCTL_ALBCN);
  83         }
  84
  85         /* enable power saving hw function */
  86         MACvRegBitsOn(priv->PortOffset, MAC_REG_PSCTL, PSCTL_PSEN);
  87         priv->bEnablePSMode = true;
  88
  89         priv->bPWBitOn = true;
  90         pr_debug("PS:Power Saving Mode Enable...\n");
  91 }
  92
  93 /*
  94  *
  95  * Routine Description:
  96  * Disable hw power saving functions
  97  *
  98  * Return Value:
  99  *    None.
 100  *
 101  */
 102
 103 void
 104 PSvDisablePowerSaving(
 105         struct vnt_private *priv
 106 )
 107 {
 108         /* disable power saving hw function */
 109         MACbPSWakeup(priv);
 110         /* clear AutoSleep */
 111         MACvRegBitsOff(priv->PortOffset, MAC_REG_PSCFG, PSCFG_AUTOSLEEP);
 112         /* clear HWUTSF */
 113         MACvRegBitsOff(priv->PortOffset, MAC_REG_TFTCTL, TFTCTL_HWUTSF);
 114         /* set always listen beacon */
 115         MACvRegBitsOn(priv->PortOffset, MAC_REG_PSCTL, PSCTL_ALBCN);
 116
 117         priv->bEnablePSMode = false;
 118
 119         priv->bPWBitOn = false;
 120 }
 121
 122 /*
 123  *
 124  * Routine Description:
 125  * Check if Next TBTT must wake up
 126  *
 127  * Return Value:
 128  *    None.
 129  *
 130  */
 131
 132 bool
 133 PSbIsNextTBTTWakeUp(
 134         struct vnt_private *priv
 135 )
 136 {
 137         struct ieee80211_hw *hw = priv->hw;
 138         struct ieee80211_conf *conf = &hw->conf;
 139         bool wake_up = false;
 140
 141         if (conf->listen_interval > 1) {
 142                 if (!priv->wake_up_count)
 143                         priv->wake_up_count = conf->listen_interval;
 144
 145                 --priv->wake_up_count;
 146
 147                 if (priv->wake_up_count == 1) {
 148                         /* Turn on wake up to listen next beacon */
 149                         MACvRegBitsOn(priv->PortOffset,
 150                                       MAC_REG_PSCTL, PSCTL_LNBCN);
 151                         wake_up = true;
 152                 }
 153         }
 154
 155         return wake_up;
 156 }