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      1 /*
      2  * Copyright (c) 2002-2008 Sam Leffler, Errno Consulting
      3  * Copyright (c) 2002-2004 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: ar5210_power.c,v 1.1.1.1 2008/12/11 04:46:27 alc Exp $
     18  */
     19 #include "opt_ah.h"
     20 
     21 #include "ah.h"
     22 #include "ah_internal.h"
     23 
     24 #include "ar5210/ar5210.h"
     25 #include "ar5210/ar5210reg.h"
     26 
     27 /*
     28  * Notify Power Mgt is disabled in self-generated frames.
     29  * If requested, set Power Mode of chip to auto/normal.
     30  */
     31 static void
     32 ar5210SetPowerModeAuto(struct ath_hal *ah, int setChip)
     33 {
     34 	OS_REG_SET_BIT(ah, AR_STA_ID1, AR_STA_ID1_PWR_SV);
     35 	if (setChip)
     36 		OS_REG_RMW_FIELD(ah, AR_SCR, AR_SCR_SLE, AR_SCR_SLE_ALLOW);
     37 }
     38 
     39 /*
     40  * Notify Power Mgt is enabled in self-generated frames.
     41  * If requested, force chip awake.
     42  *
     43  * Returns A_OK if chip is awake or successfully forced awake.
     44  *
     45  * WARNING WARNING WARNING
     46  * There is a problem with the chip where sometimes it will not wake up.
     47  */
     48 static HAL_BOOL
     49 ar5210SetPowerModeAwake(struct ath_hal *ah, int setChip)
     50 {
     51 #define	POWER_UP_TIME	2000
     52 	uint32_t val;
     53 	int i;
     54 
     55 	if (setChip) {
     56 		OS_REG_RMW_FIELD(ah, AR_SCR, AR_SCR_SLE, AR_SCR_SLE_WAKE);
     57 		OS_DELAY(2000);	/* Give chip the chance to awake */
     58 
     59 		for (i = POWER_UP_TIME / 200; i != 0; i--) {
     60 			val = OS_REG_READ(ah, AR_PCICFG);
     61 			if ((val & AR_PCICFG_SPWR_DN) == 0)
     62 				break;
     63 			OS_DELAY(200);
     64 			OS_REG_RMW_FIELD(ah, AR_SCR, AR_SCR_SLE,
     65 				AR_SCR_SLE_WAKE);
     66 		}
     67 		if (i == 0) {
     68 #ifdef AH_DEBUG
     69 			ath_hal_printf(ah, "%s: Failed to wakeup in %ums\n",
     70 				__func__, POWER_UP_TIME/20);
     71 #endif
     72 			return AH_FALSE;
     73 		}
     74 	}
     75 
     76 	OS_REG_CLR_BIT(ah, AR_STA_ID1, AR_STA_ID1_PWR_SV);
     77 	return AH_TRUE;
     78 #undef POWER_UP_TIME
     79 }
     80 
     81 /*
     82  * Notify Power Mgt is disabled in self-generated frames.
     83  * If requested, force chip to sleep.
     84  */
     85 static void
     86 ar5210SetPowerModeSleep(struct ath_hal *ah, int setChip)
     87 {
     88 	OS_REG_SET_BIT(ah, AR_STA_ID1, AR_STA_ID1_PWR_SV);
     89 	if (setChip)
     90 		OS_REG_RMW_FIELD(ah, AR_SCR, AR_SCR_SLE, AR_SCR_SLE_SLP);
     91 }
     92 
     93 HAL_BOOL
     94 ar5210SetPowerMode(struct ath_hal *ah, HAL_POWER_MODE mode, int setChip)
     95 {
     96 	struct ath_hal_5210 *ahp = AH5210(ah);
     97 #ifdef AH_DEBUG
     98 	static const char* modes[] = {
     99 		"AWAKE",
    100 		"FULL-SLEEP",
    101 		"NETWORK SLEEP",
    102 		"UNDEFINED"
    103 	};
    104 #endif
    105 	int status = AH_TRUE;
    106 
    107 	HALDEBUG(ah, HAL_DEBUG_POWER, "%s: %s -> %s (%s)\n", __func__,
    108 		modes[ahp->ah_powerMode], modes[mode],
    109 		setChip ? "set chip " : "");
    110 	switch (mode) {
    111 	case HAL_PM_AWAKE:
    112 		status = ar5210SetPowerModeAwake(ah, setChip);
    113 		break;
    114 	case HAL_PM_FULL_SLEEP:
    115 		ar5210SetPowerModeSleep(ah, setChip);
    116 		break;
    117 	case HAL_PM_NETWORK_SLEEP:
    118 		ar5210SetPowerModeAuto(ah, setChip);
    119 		break;
    120 	default:
    121 		HALDEBUG(ah, HAL_DEBUG_ANY, "%s: unknown power mode %u\n",
    122 		    __func__, mode);
    123 		return AH_FALSE;
    124 	}
    125 	ahp->ah_powerMode = mode;
    126 	return status;
    127 }
    128 
    129 HAL_POWER_MODE
    130 ar5210GetPowerMode(struct ath_hal *ah)
    131 {
    132 	/* Just so happens the h/w maps directly to the abstracted value */
    133 	return MS(OS_REG_READ(ah, AR_SCR), AR_SCR_SLE);
    134 }
    135