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      1 /*
      2  * Copyright (c) 2002-2008 Sam Leffler, Errno Consulting
      3  * Copyright (c) 2002-2006 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: ar5211_power.c,v 1.1.1.1 2008/12/11 04:46:32 alc Exp $
     18  */
     19 #include "opt_ah.h"
     20 
     21 #include "ah.h"
     22 #include "ah_internal.h"
     23 
     24 #include "ar5211/ar5211.h"
     25 #include "ar5211/ar5211reg.h"
     26 #include "ar5211/ar5211desc.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 ar5211SetPowerModeAwake(struct ath_hal *ah, int setChip)
     39 {
     40 #define	POWER_UP_TIME	2000
     41 	uint32_t val;
     42 	int i;
     43 
     44 	if (setChip) {
     45 		OS_REG_RMW_FIELD(ah, AR_SCR, AR_SCR_SLE, AR_SCR_SLE_WAKE);
     46 		OS_DELAY(10);	/* Give chip the chance to awake */
     47 
     48 		for (i = POWER_UP_TIME / 200; i != 0; i--) {
     49 			val = OS_REG_READ(ah, AR_PCICFG);
     50 			if ((val & AR_PCICFG_SPWR_DN) == 0)
     51 				break;
     52 			OS_DELAY(200);
     53 			OS_REG_RMW_FIELD(ah, AR_SCR, AR_SCR_SLE,
     54 				AR_SCR_SLE_WAKE);
     55 		}
     56 		if (i == 0) {
     57 #ifdef AH_DEBUG
     58 			ath_hal_printf(ah, "%s: Failed to wakeup in %ums\n",
     59 				__func__, POWER_UP_TIME/20);
     60 #endif
     61 			return AH_FALSE;
     62 		}
     63 	}
     64 
     65 	OS_REG_CLR_BIT(ah, AR_STA_ID1, AR_STA_ID1_PWR_SAV);
     66 	return AH_TRUE;
     67 #undef POWER_UP_TIME
     68 }
     69 
     70 /*
     71  * Notify Power Mgt is disabled in self-generated frames.
     72  * If requested, force chip to sleep.
     73  */
     74 static void
     75 ar5211SetPowerModeSleep(struct ath_hal *ah, int setChip)
     76 {
     77 	OS_REG_SET_BIT(ah, AR_STA_ID1, AR_STA_ID1_PWR_SAV);
     78 	if (setChip)
     79 		OS_REG_RMW_FIELD(ah, AR_SCR, AR_SCR_SLE, AR_SCR_SLE_SLP);
     80 }
     81 
     82 /*
     83  * Notify Power Management is enabled in self-generating
     84  * fames.  If request, set power mode of chip to
     85  * auto/normal.  Duration in units of 128us (1/8 TU).
     86  */
     87 static void
     88 ar5211SetPowerModeNetworkSleep(struct ath_hal *ah, int setChip)
     89 {
     90 	OS_REG_SET_BIT(ah, AR_STA_ID1, AR_STA_ID1_PWR_SAV);
     91 	if (setChip)
     92 		OS_REG_RMW_FIELD(ah, AR_SCR, AR_SCR_SLE, AR_SCR_SLE_NORM);
     93 }
     94 
     95 HAL_BOOL
     96 ar5211SetPowerMode(struct ath_hal *ah, HAL_POWER_MODE mode, int setChip)
     97 {
     98 	struct ath_hal_5211 *ahp = AH5211(ah);
     99 #ifdef AH_DEBUG
    100 	static const char* modes[] = {
    101 		"AWAKE",
    102 		"FULL-SLEEP",
    103 		"NETWORK SLEEP",
    104 		"UNDEFINED"
    105 	};
    106 #endif
    107 	int status = AH_TRUE;
    108 
    109 	HALDEBUG(ah, HAL_DEBUG_POWER, "%s: %s -> %s (%s)\n", __func__,
    110 		modes[ahp->ah_powerMode], modes[mode],
    111 		setChip ? "set chip " : "");
    112 	switch (mode) {
    113 	case HAL_PM_AWAKE:
    114 		status = ar5211SetPowerModeAwake(ah, setChip);
    115 		break;
    116 	case HAL_PM_FULL_SLEEP:
    117 		ar5211SetPowerModeSleep(ah, setChip);
    118 		break;
    119 	case HAL_PM_NETWORK_SLEEP:
    120 		ar5211SetPowerModeNetworkSleep(ah, setChip);
    121 		break;
    122 	default:
    123 		HALDEBUG(ah, HAL_DEBUG_ANY, "%s: unknown power mode %u\n",
    124 		    __func__, mode);
    125 		return AH_FALSE;
    126 	}
    127 	ahp->ah_powerMode = mode;
    128 	return status;
    129 }
    130 
    131 HAL_POWER_MODE
    132 ar5211GetPowerMode(struct ath_hal *ah)
    133 {
    134 	/* Just so happens the h/w maps directly to the abstracted value */
    135 	return MS(OS_REG_READ(ah, AR_SCR), AR_SCR_SLE);
    136 }
    137