sys/dev/netif/ath/hal/ath_hal/ar5416/ar5416_power.c

   1 /*
   2  * Copyright (c) 2002-2008 Sam Leffler, Errno Consulting
   3  * Copyright (c) 2002-2008 Atheros Communications, Inc.
   4  *
   5  * Permission to use, copy, modify, and/or distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  16  *
  17  * $FreeBSD: head/sys/dev/ath/ath_hal/ar5416/ar5416_power.c 203156 2010-01-29 10:02:50Z rpaulo $
  18  */
  19 #include "opt_ah.h"
  20
  21 #include "ah.h"
  22 #include "ah_internal.h"
  23
  24 #include "ar5416/ar5416.h"
  25 #include "ar5416/ar5416reg.h"
  26
  27 /*
  28  * Notify Power Mgt is enabled in self-generated frames.
  29  * If requested, force chip awake.
  30  *
  31  * Returns A_OK if chip is awake or successfully forced awake.
  32  *
  33  * WARNING WARNING WARNING
  34  * There is a problem with the chip where sometimes it will not wake up.
  35  */
  36 static HAL_BOOL
  37 ar5416SetPowerModeAwake(struct ath_hal *ah, int setChip)
  38 {
  39 #define POWER_UP_TIME   200000
  40         uint32_t val;
  41         int i = 0;
  42
  43         if (setChip) {
  44                 /*
  45                  * Do a Power-On-Reset if OWL is shutdown
  46                  * the NetBSD driver  power-cycles the Cardbus slot
  47                  * as part of the reset procedure.
  48                  */
  49                 if ((OS_REG_READ(ah, AR_RTC_STATUS)
  50                         & AR_RTC_PM_STATUS_M) == AR_RTC_STATUS_SHUTDOWN) {
  51                         if (!ar5416SetResetReg(ah, HAL_RESET_POWER_ON))
  52                                 goto bad;
  53                 }
  54
  55                 OS_REG_SET_BIT(ah, AR_RTC_FORCE_WAKE, AR_RTC_FORCE_WAKE_EN);
  56                 OS_DELAY(50);   /* Give chip the chance to awake */
  57
  58                 for (i = POWER_UP_TIME / 50; i != 0; i--) {
  59                         val = OS_REG_READ(ah, AR_RTC_STATUS) & AR_RTC_STATUS_M;
  60                         if (val == AR_RTC_STATUS_ON)
  61                                 break;
  62                         OS_DELAY(50);
  63                         OS_REG_SET_BIT(ah, AR_RTC_FORCE_WAKE, AR_RTC_FORCE_WAKE_EN);
  64                 }
  65         bad:
  66                 if (i == 0) {
  67 #ifdef AH_DEBUG
  68                         ath_hal_printf(ah, "%s: Failed to wakeup in %ums\n",
  69                                 __func__, POWER_UP_TIME/1000);
  70 #endif
  71                         return AH_FALSE;
  72                 }
  73         }
  74
  75         OS_REG_CLR_BIT(ah, AR_STA_ID1, AR_STA_ID1_PWR_SAV);
  76         return AH_TRUE;
  77 #undef POWER_UP_TIME
  78 }
  79
  80 /*
  81  * Notify Power Mgt is disabled in self-generated frames.
  82  * If requested, force chip to sleep.
  83  */
  84 static void
  85 ar5416SetPowerModeSleep(struct ath_hal *ah, int setChip)
  86 {
  87         OS_REG_SET_BIT(ah, AR_STA_ID1, AR_STA_ID1_PWR_SAV);
  88         if (setChip) {
  89                 /* Clear the RTC force wake bit to allow the mac to sleep */
  90                 OS_REG_CLR_BIT(ah, AR_RTC_FORCE_WAKE, AR_RTC_FORCE_WAKE_EN);
  91                 OS_REG_WRITE(ah, AR_RC, AR_RC_AHB|AR_RC_HOSTIF);
  92                 /* Shutdown chip. Active low */
  93                 OS_REG_CLR_BIT(ah, AR_RTC_RESET, AR_RTC_RESET_EN);
  94         }
  95 }
  96
  97 /*
  98  * Notify Power Management is enabled in self-generating
  99  * fames.  If request, set power mode of chip to
 100  * auto/normal.  Duration in units of 128us (1/8 TU).
 101  */
 102 static void
 103 ar5416SetPowerModeNetworkSleep(struct ath_hal *ah, int setChip)
 104 {
 105         OS_REG_SET_BIT(ah, AR_STA_ID1, AR_STA_ID1_PWR_SAV);
 106
 107         if (setChip)
 108                 OS_REG_CLR_BIT(ah, AR_RTC_FORCE_WAKE, AR_RTC_FORCE_WAKE_EN);
 109 }
 110
 111 /*
 112  * Set power mgt to the requested mode, and conditionally set
 113  * the chip as well
 114  */
 115 HAL_BOOL
 116 ar5416SetPowerMode(struct ath_hal *ah, HAL_POWER_MODE mode, int setChip)
 117 {
 118         struct ath_hal_5212 *ahp = AH5212(ah);
 119 #ifdef AH_DEBUG
 120         static const char* modes[] = {
 121                 "AWAKE",
 122                 "FULL-SLEEP",
 123                 "NETWORK SLEEP",
 124                 "UNDEFINED"
 125         };
 126 #endif
 127         int status = AH_TRUE;
 128         if (!setChip)
 129                 return AH_TRUE;
 130
 131         HALDEBUG(ah, HAL_DEBUG_POWER, "%s: %s -> %s (%s)\n", __func__,
 132             modes[ahp->ah_powerMode], modes[mode], setChip ? "set chip " : "");
 133         switch (mode) {
 134         case HAL_PM_AWAKE:
 135                 status = ar5416SetPowerModeAwake(ah, setChip);
 136                 break;
 137         case HAL_PM_FULL_SLEEP:
 138                 ar5416SetPowerModeSleep(ah, setChip);
 139                 break;
 140         case HAL_PM_NETWORK_SLEEP:
 141                 ar5416SetPowerModeNetworkSleep(ah, setChip);
 142                 break;
 143         default:
 144                 HALDEBUG(ah, HAL_DEBUG_ANY, "%s: unknown power mode 0x%x\n",
 145                     __func__, mode);
 146                 return AH_FALSE;
 147         }
 148         ahp->ah_powerMode = mode;
 149         return status;
 150 }
 151
 152 /*
 153  * Return the current sleep mode of the chip
 154  */
 155 HAL_POWER_MODE
 156 ar5416GetPowerMode(struct ath_hal *ah)
 157 {
 158         int mode = OS_REG_READ(ah, AR_RTC_STATUS);
 159         switch (mode & AR_RTC_PM_STATUS_M) {
 160         case AR_RTC_STATUS_ON:
 161         case AR_RTC_STATUS_WAKEUP:
 162                 return HAL_PM_AWAKE;
 163         case AR_RTC_STATUS_SLEEP:
 164                 return HAL_PM_NETWORK_SLEEP;
 165         case AR_RTC_STATUS_SHUTDOWN:
 166                 return HAL_PM_FULL_SLEEP;
 167         default:
 168                 HALDEBUG(ah, HAL_DEBUG_ANY,
 169                     "%s: unknown power mode, RTC_STATUS 0x%x\n",
 170                     __func__, mode);
 171                 return HAL_PM_UNDEFINED;
 172         }
 173 }