1 /*- 2 * SPDX-License-Identifier: ISC 3 * 4 * Copyright (c) 2002-2008 Sam Leffler, Errno Consulting 5 * Copyright (c) 2002-2008 Atheros Communications, Inc. 6 * 7 * Permission to use, copy, modify, and/or distribute this software for any 8 * purpose with or without fee is hereby granted, provided that the above 9 * copyright notice and this permission notice appear in all copies. 10 * 11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 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_SLDTP|AR_SCR_SLDWP|\ 42 AR_SCR_SLEPOL|AR_SCR_MIBIE|AR_SCR_UNKNOWN) 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 no one 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 #ifdef AH_DEBUG 123 static const char* modes[] = { 124 "AWAKE", 125 "FULL-SLEEP", 126 "NETWORK SLEEP", 127 "UNDEFINED" 128 }; 129 #endif 130 int status = AH_TRUE; 131 132 HALDEBUG(ah, HAL_DEBUG_POWER, "%s: %s -> %s (%s)\n", __func__, 133 modes[ah->ah_powerMode], modes[mode], 134 setChip ? "set chip " : ""); 135 switch (mode) { 136 case HAL_PM_AWAKE: 137 if (setChip) 138 ah->ah_powerMode = mode; 139 status = ar5212SetPowerModeAwake(ah, setChip); 140 break; 141 case HAL_PM_FULL_SLEEP: 142 ar5212SetPowerModeSleep(ah, setChip); 143 if (setChip) 144 ah->ah_powerMode = mode; 145 break; 146 case HAL_PM_NETWORK_SLEEP: 147 ar5212SetPowerModeNetworkSleep(ah, setChip); 148 if (setChip) 149 ah->ah_powerMode = mode; 150 break; 151 default: 152 HALDEBUG(ah, HAL_DEBUG_ANY, "%s: unknown power mode %u\n", 153 __func__, mode); 154 return AH_FALSE; 155 } 156 return status; 157 } 158 159 /* 160 * Return the current sleep mode of the chip 161 */ 162 HAL_POWER_MODE 163 ar5212GetPowerMode(struct ath_hal *ah) 164 { 165 /* Just so happens the h/w maps directly to the abstracted value */ 166 return MS(OS_REG_READ(ah, AR_SCR), AR_SCR_SLE); 167 } 168 169 #if 0 170 /* 171 * Return the current sleep state of the chip 172 * TRUE = sleeping 173 */ 174 HAL_BOOL 175 ar5212GetPowerStatus(struct ath_hal *ah) 176 { 177 return (OS_REG_READ(ah, AR_PCICFG) & AR_PCICFG_SPWR_DN) != 0; 178 } 179 #endif 180