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: ar5416_power.c,v 1.6 2008/11/11 00:11:30 sam Exp $ 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 } 174