1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (c) 1996, 2003 VIA Networking Technologies, Inc.
4 * All rights reserved.
5 *
6 * File: power.c
7 *
8 * Purpose: Handles 802.11 power management functions
9 *
10 * Author: Lyndon Chen
11 *
12 * Date: July 17, 2002
13 *
14 * Functions:
15 * PSvEnablePowerSaving - Enable Power Saving Mode
16 * PSvDiasblePowerSaving - Disable Power Saving Mode
17 * PSbConsiderPowerDown - Decide if we can Power Down
18 * PSvSendPSPOLL - Send PS-POLL packet
19 * PSbSendNullPacket - Send Null packet
20 * PSbIsNextTBTTWakeUp - Decide if we need to wake up at next Beacon
21 *
22 * Revision History:
23 *
24 */
25
26 #include "mac.h"
27 #include "device.h"
28 #include "power.h"
29 #include "card.h"
30
31 /*--------------------- Static Definitions -------------------------*/
32
33 /*--------------------- Static Classes ----------------------------*/
34
35 /*--------------------- Static Functions --------------------------*/
36
37 /*--------------------- Export Variables --------------------------*/
38
39 /*--------------------- Export Functions --------------------------*/
40
41 /*
42 *
43 * Routine Description:
44 * Enable hw power saving functions
45 *
46 * Return Value:
47 * None.
48 *
49 */
50
51 void PSvEnablePowerSaving(struct vnt_private *priv,
52 unsigned short wListenInterval)
53 {
54 u16 wAID = priv->current_aid | BIT(14) | BIT(15);
55
56 /* set period of power up before TBTT */
57 VNSvOutPortW(priv->PortOffset + MAC_REG_PWBT, C_PWBT);
58 if (priv->op_mode != NL80211_IFTYPE_ADHOC) {
59 /* set AID */
60 VNSvOutPortW(priv->PortOffset + MAC_REG_AIDATIM, wAID);
61 } else {
62 /* set ATIM Window */
63 #if 0 /* TODO atim window */
64 MACvWriteATIMW(priv->PortOffset, pMgmt->wCurrATIMWindow);
65 #endif
66 }
67 /* Set AutoSleep */
68 MACvRegBitsOn(priv->PortOffset, MAC_REG_PSCFG, PSCFG_AUTOSLEEP);
69 /* Set HWUTSF */
70 MACvRegBitsOn(priv->PortOffset, MAC_REG_TFTCTL, TFTCTL_HWUTSF);
71
72 if (wListenInterval >= 2) {
73 /* clear always listen beacon */
74 MACvRegBitsOff(priv->PortOffset, MAC_REG_PSCTL, PSCTL_ALBCN);
75 /* first time set listen next beacon */
76 MACvRegBitsOn(priv->PortOffset, MAC_REG_PSCTL, PSCTL_LNBCN);
77 } else {
78 /* always listen beacon */
79 MACvRegBitsOn(priv->PortOffset, MAC_REG_PSCTL, PSCTL_ALBCN);
80 }
81
82 /* enable power saving hw function */
83 MACvRegBitsOn(priv->PortOffset, MAC_REG_PSCTL, PSCTL_PSEN);
84 priv->bEnablePSMode = true;
85
86 priv->bPWBitOn = true;
87 pr_debug("PS:Power Saving Mode Enable...\n");
88 }
89
90 /*
91 *
92 * Routine Description:
93 * Disable hw power saving functions
94 *
95 * Return Value:
96 * None.
97 *
98 */
99
100 void
101 PSvDisablePowerSaving(
102 struct vnt_private *priv
103 )
104 {
105 /* disable power saving hw function */
106 MACbPSWakeup(priv);
107 /* clear AutoSleep */
108 MACvRegBitsOff(priv->PortOffset, MAC_REG_PSCFG, PSCFG_AUTOSLEEP);
109 /* clear HWUTSF */
110 MACvRegBitsOff(priv->PortOffset, MAC_REG_TFTCTL, TFTCTL_HWUTSF);
111 /* set always listen beacon */
112 MACvRegBitsOn(priv->PortOffset, MAC_REG_PSCTL, PSCTL_ALBCN);
113
114 priv->bEnablePSMode = false;
115
116 priv->bPWBitOn = false;
117 }
118
119 /*
120 *
121 * Routine Description:
122 * Check if Next TBTT must wake up
123 *
124 * Return Value:
125 * None.
126 *
127 */
128
129 bool
130 PSbIsNextTBTTWakeUp(
131 struct vnt_private *priv
132 )
133 {
134 struct ieee80211_hw *hw = priv->hw;
135 struct ieee80211_conf *conf = &hw->conf;
136 bool wake_up = false;
137
138 if (conf->listen_interval > 1) {
139 if (!priv->wake_up_count)
140 priv->wake_up_count = conf->listen_interval;
141
142 --priv->wake_up_count;
143
144 if (priv->wake_up_count == 1) {
145 /* Turn on wake up to listen next beacon */
146 MACvRegBitsOn(priv->PortOffset,
147 MAC_REG_PSCTL, PSCTL_LNBCN);
148 wake_up = true;
149 }
150 }
151
152 return wake_up;
153 }