1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Copyright (c) 1996, 2003 VIA Networking Technologies, Inc.
4 * All rights reserved.
5 *
6 * Purpose: Handles 802.11 power management functions
7 *
8 * Author: Lyndon Chen
9 *
10 * Date: July 17, 2002
11 *
12 * Functions:
13 * PSvEnablePowerSaving - Enable Power Saving Mode
14 * PSvDiasblePowerSaving - Disable Power Saving Mode
15 * PSbConsiderPowerDown - Decide if we can Power Down
16 * PSvSendPSPOLL - Send PS-POLL packet
17 * PSbSendNullPacket - Send Null packet
18 * PSbIsNextTBTTWakeUp - Decide if we need to wake up at next Beacon
19 *
20 * Revision History:
21 *
22 */
23
24#include "mac.h"
25#include "device.h"
26#include "power.h"
27#include "card.h"
28
29/*--------------------- Static Definitions -------------------------*/
30
31/*--------------------- Static Classes ----------------------------*/
32
33/*--------------------- Static Functions --------------------------*/
34
35/*--------------------- Export Variables --------------------------*/
36
37/*--------------------- Export Functions --------------------------*/
38
39/*
40 *
41 * Routine Description:
42 * Enable hw power saving functions
43 *
44 * Return Value:
45 * None.
46 *
47 */
48
49void PSvEnablePowerSaving(struct vnt_private *priv,
50 unsigned short wListenInterval)
51{
52 u16 wAID = priv->current_aid | BIT(14) | BIT(15);
53
54 /* set period of power up before TBTT */
55 iowrite16(C_PWBT, priv->port_offset + MAC_REG_PWBT);
56 if (priv->op_mode != NL80211_IFTYPE_ADHOC) {
57 /* set AID */
58 iowrite16(wAID, priv->port_offset + MAC_REG_AIDATIM);
59 }
60
61 /* Set AutoSleep */
62 vt6655_mac_reg_bits_on(iobase: priv->port_offset, MAC_REG_PSCFG, PSCFG_AUTOSLEEP);
63
64 /* Set HWUTSF */
65 vt6655_mac_reg_bits_on(iobase: priv->port_offset, MAC_REG_TFTCTL, TFTCTL_HWUTSF);
66
67 if (wListenInterval >= 2) {
68 /* clear always listen beacon */
69 vt6655_mac_reg_bits_off(iobase: priv->port_offset, MAC_REG_PSCTL, PSCTL_ALBCN);
70 /* first time set listen next beacon */
71 vt6655_mac_reg_bits_on(iobase: priv->port_offset, MAC_REG_PSCTL, PSCTL_LNBCN);
72 } else {
73 /* always listen beacon */
74 vt6655_mac_reg_bits_on(iobase: priv->port_offset, MAC_REG_PSCTL, PSCTL_ALBCN);
75 }
76
77 /* enable power saving hw function */
78 vt6655_mac_reg_bits_on(iobase: priv->port_offset, MAC_REG_PSCTL, PSCTL_PSEN);
79 priv->bEnablePSMode = true;
80
81 priv->bPWBitOn = true;
82 pr_debug("PS:Power Saving Mode Enable...\n");
83}
84
85/*
86 *
87 * Routine Description:
88 * Disable hw power saving functions
89 *
90 * Return Value:
91 * None.
92 *
93 */
94
95void PSvDisablePowerSaving(struct vnt_private *priv)
96{
97 /* disable power saving hw function */
98 MACbPSWakeup(priv);
99
100 /* clear AutoSleep */
101 vt6655_mac_reg_bits_off(iobase: priv->port_offset, MAC_REG_PSCFG, PSCFG_AUTOSLEEP);
102
103 /* clear HWUTSF */
104 vt6655_mac_reg_bits_off(iobase: priv->port_offset, MAC_REG_TFTCTL, TFTCTL_HWUTSF);
105
106 /* set always listen beacon */
107 vt6655_mac_reg_bits_on(iobase: priv->port_offset, MAC_REG_PSCTL, PSCTL_ALBCN);
108
109 priv->bEnablePSMode = false;
110
111 priv->bPWBitOn = false;
112}
113
114/*
115 *
116 * Routine Description:
117 * Check if Next TBTT must wake up
118 *
119 * Return Value:
120 * None.
121 *
122 */
123
124bool PSbIsNextTBTTWakeUp(struct vnt_private *priv)
125{
126 struct ieee80211_hw *hw = priv->hw;
127 struct ieee80211_conf *conf = &hw->conf;
128 bool wake_up = false;
129
130 if (conf->listen_interval > 1) {
131 if (!priv->wake_up_count)
132 priv->wake_up_count = conf->listen_interval;
133
134 --priv->wake_up_count;
135
136 if (priv->wake_up_count == 1) {
137 /* Turn on wake up to listen next beacon */
138 vt6655_mac_reg_bits_on(iobase: priv->port_offset, MAC_REG_PSCTL, PSCTL_LNBCN);
139 wake_up = true;
140 }
141 }
142
143 return wake_up;
144}
145

source code of linux/drivers/staging/vt6655/power.c