sys/external/isc/atheros_hal/dist/ar5212/ar5212_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  * $Id: ar5212_power.c,v 1.1.1.1 2008/12/11 04:46:41 alc Exp $
  18  */
  19 #include "opt_ah.h"
  20
  21 #include "ah.h"
  22 #include "ah_internal.h"
  23
  24 #include "ar5212/ar5212.h"
  25 #include "ar5212/ar5212reg.h"
  26 #include "ar5212/ar5212desc.h"
  27
  28 /*
  29  * Notify Power Mgt is enabled in self-generated frames.
  30  * If requested, force chip awake.
  31  *
  32  * Returns A_OK if chip is awake or successfully forced awake.
  33  *
  34  * WARNING WARNING WARNING
  35  * There is a problem with the chip where sometimes it will not wake up.
  36  */
  37 static HAL_BOOL
  38 ar5212SetPowerModeAwake(struct ath_hal *ah, int setChip)
  39 {
  40 #define AR_SCR_MASK \
  41     (AR_SCR_SLDUR|AR_SCR_SLE|AR_SCR_SLE|AR_SCR_SLDTP|AR_SCR_SLDWP|\
  42      AR_SCR_SLEPOL|AR_SCR_MIBIE)
  43 #define POWER_UP_TIME   2000
  44         uint32_t scr, val;
  45         int i;
  46
  47         if (setChip) {
  48                 /*
  49                  * Be careful setting the AWAKE mode.  When we are called
  50                  * with the chip powered down the read returns 0xffffffff
  51                  * which when blindly written back with OS_REG_RMW_FIELD
  52                  * enables the MIB interrupt for the sleep performance
  53                  * counters.  This can result in an interrupt storm when
  54                  * ANI is in operation as noone knows to turn off the MIB
  55                  * interrupt cause.
  56                  */
  57                 scr = OS_REG_READ(ah, AR_SCR);
  58                 if (scr & ~AR_SCR_MASK) {
  59                         HALDEBUG(ah, HAL_DEBUG_ANY,
  60                             "%s: bogus SCR 0x%x, PCICFG 0x%x\n",
  61                             __func__, scr, OS_REG_READ(ah, AR_PCICFG));
  62                         scr = 0;
  63                 }
  64                 scr = (scr &~ AR_SCR_SLE) | AR_SCR_SLE_WAKE;
  65                 OS_REG_WRITE(ah, AR_SCR, scr);
  66                 OS_DELAY(10);   /* Give chip the chance to awake */
  67
  68                 for (i = POWER_UP_TIME / 50; i != 0; i--) {
  69                         val = OS_REG_READ(ah, AR_PCICFG);
  70                         if ((val & AR_PCICFG_SPWR_DN) == 0)
  71                                 break;
  72                         OS_DELAY(50);
  73                         OS_REG_WRITE(ah, AR_SCR, scr);
  74                 }
  75                 if (i == 0) {
  76 #ifdef AH_DEBUG
  77                         ath_hal_printf(ah, "%s: Failed to wakeup in %ums\n",
  78                                 __func__, POWER_UP_TIME/50);
  79 #endif
  80                         return AH_FALSE;
  81                 }
  82         }
  83
  84         OS_REG_CLR_BIT(ah, AR_STA_ID1, AR_STA_ID1_PWR_SAV);
  85         return AH_TRUE;
  86 #undef POWER_UP_TIME
  87 #undef AR_SCR_MASK
  88 }
  89
  90 /*
  91  * Notify Power Mgt is disabled in self-generated frames.
  92  * If requested, force chip to sleep.
  93  */
  94 static void
  95 ar5212SetPowerModeSleep(struct ath_hal *ah, int setChip)
  96 {
  97         OS_REG_SET_BIT(ah, AR_STA_ID1, AR_STA_ID1_PWR_SAV);
  98         if (setChip)
  99                 OS_REG_RMW_FIELD(ah, AR_SCR, AR_SCR_SLE, AR_SCR_SLE_SLP);
 100 }
 101
 102 /*
 103  * Notify Power Management is enabled in self-generating
 104  * fames.  If request, set power mode of chip to
 105  * auto/normal.  Duration in units of 128us (1/8 TU).
 106  */
 107 static void
 108 ar5212SetPowerModeNetworkSleep(struct ath_hal *ah, int setChip)
 109 {
 110         OS_REG_SET_BIT(ah, AR_STA_ID1, AR_STA_ID1_PWR_SAV);
 111         if (setChip)
 112                 OS_REG_RMW_FIELD(ah, AR_SCR, AR_SCR_SLE, AR_SCR_SLE_NORM);
 113 }
 114
 115 /*
 116  * Set power mgt to the requested mode, and conditionally set
 117  * the chip as well
 118  */
 119 HAL_BOOL
 120 ar5212SetPowerMode(struct ath_hal *ah, HAL_POWER_MODE mode, int setChip)
 121 {
 122         struct ath_hal_5212 *ahp = AH5212(ah);
 123 #ifdef AH_DEBUG
 124         static const char* modes[] = {
 125                 "AWAKE",
 126                 "FULL-SLEEP",
 127                 "NETWORK SLEEP",
 128                 "UNDEFINED"
 129         };
 130 #endif
 131         int status = AH_TRUE;
 132
 133         HALDEBUG(ah, HAL_DEBUG_POWER, "%s: %s -> %s (%s)\n", __func__,
 134                 modes[ahp->ah_powerMode], modes[mode],
 135                 setChip ? "set chip " : "");
 136         switch (mode) {
 137         case HAL_PM_AWAKE:
 138                 status = ar5212SetPowerModeAwake(ah, setChip);
 139                 break;
 140         case HAL_PM_FULL_SLEEP:
 141                 ar5212SetPowerModeSleep(ah, setChip);
 142                 break;
 143         case HAL_PM_NETWORK_SLEEP:
 144                 ar5212SetPowerModeNetworkSleep(ah, setChip);
 145                 break;
 146         default:
 147                 HALDEBUG(ah, HAL_DEBUG_ANY, "%s: unknown power mode %u\n",
 148                     __func__, mode);
 149                 return AH_FALSE;
 150         }
 151         ahp->ah_powerMode = mode;
 152         return status;
 153 }
 154
 155 /*
 156  * Return the current sleep mode of the chip
 157  */
 158 HAL_POWER_MODE
 159 ar5212GetPowerMode(struct ath_hal *ah)
 160 {
 161         /* Just so happens the h/w maps directly to the abstracted value */
 162         return MS(OS_REG_READ(ah, AR_SCR), AR_SCR_SLE);
 163 }
 164
 165 #if 0
 166 /*
 167  * Return the current sleep state of the chip
 168  * TRUE = sleeping
 169  */
 170 HAL_BOOL
 171 ar5212GetPowerStatus(struct ath_hal *ah)
 172 {
 173         return (OS_REG_READ(ah, AR_PCICFG) & AR_PCICFG_SPWR_DN) != 0;
 174 }
 175 #endif