ar5210_power.c revision 185377 
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 1.4 2008/11/10 04:08:02 sam Exp $
18 */
19#include "opt_ah.h"
20
21#ifdef AH_SUPPORT_AR5210
22
23#include "ah.h"
24#include "ah_internal.h"
25
26#include "ar5210/ar5210.h"
27#include "ar5210/ar5210reg.h"
28
29/*
30 * Notify Power Mgt is disabled in self-generated frames.
31 * If requested, set Power Mode of chip to auto/normal.
32 */
33static void
34ar5210SetPowerModeAuto(struct ath_hal *ah, int setChip)
35{
36	OS_REG_SET_BIT(ah, AR_STA_ID1, AR_STA_ID1_PWR_SV);
37	if (setChip)
38		OS_REG_RMW_FIELD(ah, AR_SCR, AR_SCR_SLE, AR_SCR_SLE_ALLOW);
39}
40
41/*
42 * Notify Power Mgt is enabled in self-generated frames.
43 * If requested, force chip awake.
44 *
45 * Returns A_OK if chip is awake or successfully forced awake.
46 *
47 * WARNING WARNING WARNING
48 * There is a problem with the chip where sometimes it will not wake up.
49 */
50static HAL_BOOL
51ar5210SetPowerModeAwake(struct ath_hal *ah, int setChip)
52{
53#define	POWER_UP_TIME	2000
54	uint32_t val;
55	int i;
56
57	if (setChip) {
58		OS_REG_RMW_FIELD(ah, AR_SCR, AR_SCR_SLE, AR_SCR_SLE_WAKE);
59		OS_DELAY(2000);	/* Give chip the chance to awake */
60
61		for (i = POWER_UP_TIME / 200; i != 0; i--) {
62			val = OS_REG_READ(ah, AR_PCICFG);
63			if ((val & AR_PCICFG_SPWR_DN) == 0)
64				break;
65			OS_DELAY(200);
66			OS_REG_RMW_FIELD(ah, AR_SCR, AR_SCR_SLE,
67				AR_SCR_SLE_WAKE);
68		}
69		if (i == 0) {
70#ifdef AH_DEBUG
71			ath_hal_printf(ah, "%s: Failed to wakeup in %ums\n",
72				__func__, POWER_UP_TIME/20);
73#endif
74			return AH_FALSE;
75		}
76	}
77
78	OS_REG_CLR_BIT(ah, AR_STA_ID1, AR_STA_ID1_PWR_SV);
79	return AH_TRUE;
80#undef POWER_UP_TIME
81}
82
83/*
84 * Notify Power Mgt is disabled in self-generated frames.
85 * If requested, force chip to sleep.
86 */
87static void
88ar5210SetPowerModeSleep(struct ath_hal *ah, int setChip)
89{
90	OS_REG_SET_BIT(ah, AR_STA_ID1, AR_STA_ID1_PWR_SV);
91	if (setChip)
92		OS_REG_RMW_FIELD(ah, AR_SCR, AR_SCR_SLE, AR_SCR_SLE_SLP);
93}
94
95HAL_BOOL
96ar5210SetPowerMode(struct ath_hal *ah, HAL_POWER_MODE mode, int setChip)
97{
98	struct ath_hal_5210 *ahp = AH5210(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 = ar5210SetPowerModeAwake(ah, setChip);
115		break;
116	case HAL_PM_FULL_SLEEP:
117		ar5210SetPowerModeSleep(ah, setChip);
118		break;
119	case HAL_PM_NETWORK_SLEEP:
120		ar5210SetPowerModeAuto(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
131HAL_POWER_MODE
132ar5210GetPowerMode(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#endif /* AH_SUPPORT_AR5210 */
138