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1 /*
2  * Broadcom B43 wireless driver
3  * PPR (Power Per Rate) management
4  *
5  * Copyright (c) 2014 Rafał Miłecki <zajec5@gmail.com>
6  *
7  * This program is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License as published by
9  * the Free Software Foundation; either version 2 of the License, or
10  * (at your option) any later version.
11  *
12  * This program is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15  * GNU General Public License for more details.
16  */
17 
18 #include "ppr.h"
19 #include "b43.h"
20 
21 #define ppr_for_each_entry(ppr, i, entry)				\
22 	for (i = 0, entry = &(ppr)->__all_rates[i];			\
23 	     i < B43_PPR_RATES_NUM;					\
24 	     i++, entry++)
25 
b43_ppr_clear(struct b43_wldev * dev,struct b43_ppr * ppr)26 void b43_ppr_clear(struct b43_wldev *dev, struct b43_ppr *ppr)
27 {
28 	memset(ppr, 0, sizeof(*ppr));
29 
30 	/* Compile-time PPR check */
31 	BUILD_BUG_ON(sizeof(struct b43_ppr) != B43_PPR_RATES_NUM * sizeof(u8));
32 }
33 
b43_ppr_add(struct b43_wldev * dev,struct b43_ppr * ppr,int diff)34 void b43_ppr_add(struct b43_wldev *dev, struct b43_ppr *ppr, int diff)
35 {
36 	int i;
37 	u8 *rate;
38 
39 	ppr_for_each_entry(ppr, i, rate) {
40 		*rate = clamp_val(*rate + diff, 0, 127);
41 	}
42 }
43 
b43_ppr_apply_max(struct b43_wldev * dev,struct b43_ppr * ppr,u8 max)44 void b43_ppr_apply_max(struct b43_wldev *dev, struct b43_ppr *ppr, u8 max)
45 {
46 	int i;
47 	u8 *rate;
48 
49 	ppr_for_each_entry(ppr, i, rate) {
50 		*rate = min(*rate, max);
51 	}
52 }
53 
b43_ppr_apply_min(struct b43_wldev * dev,struct b43_ppr * ppr,u8 min)54 void b43_ppr_apply_min(struct b43_wldev *dev, struct b43_ppr *ppr, u8 min)
55 {
56 	int i;
57 	u8 *rate;
58 
59 	ppr_for_each_entry(ppr, i, rate) {
60 		*rate = max(*rate, min);
61 	}
62 }
63 
b43_ppr_get_max(struct b43_wldev * dev,struct b43_ppr * ppr)64 u8 b43_ppr_get_max(struct b43_wldev *dev, struct b43_ppr *ppr)
65 {
66 	u8 res = 0;
67 	int i;
68 	u8 *rate;
69 
70 	ppr_for_each_entry(ppr, i, rate) {
71 		res = max(*rate, res);
72 	}
73 
74 	return res;
75 }
76 
b43_ppr_load_max_from_sprom(struct b43_wldev * dev,struct b43_ppr * ppr,enum b43_band band)77 bool b43_ppr_load_max_from_sprom(struct b43_wldev *dev, struct b43_ppr *ppr,
78 				 enum b43_band band)
79 {
80 	struct b43_ppr_rates *rates = &ppr->rates;
81 	struct ssb_sprom *sprom = dev->dev->bus_sprom;
82 	struct b43_phy *phy = &dev->phy;
83 	u8 maxpwr, off;
84 	u32 sprom_ofdm_po;
85 	u16 *sprom_mcs_po;
86 	u8 extra_cdd_po, extra_stbc_po;
87 	int i;
88 
89 	switch (band) {
90 	case B43_BAND_2G:
91 		maxpwr = min(sprom->core_pwr_info[0].maxpwr_2g,
92 			     sprom->core_pwr_info[1].maxpwr_2g);
93 		sprom_ofdm_po = sprom->ofdm2gpo;
94 		sprom_mcs_po = sprom->mcs2gpo;
95 		extra_cdd_po = (sprom->cddpo >> 0) & 0xf;
96 		extra_stbc_po = (sprom->stbcpo >> 0) & 0xf;
97 		break;
98 	case B43_BAND_5G_LO:
99 		maxpwr = min(sprom->core_pwr_info[0].maxpwr_5gl,
100 			     sprom->core_pwr_info[1].maxpwr_5gl);
101 		sprom_ofdm_po = sprom->ofdm5glpo;
102 		sprom_mcs_po = sprom->mcs5glpo;
103 		extra_cdd_po = (sprom->cddpo >> 8) & 0xf;
104 		extra_stbc_po = (sprom->stbcpo >> 8) & 0xf;
105 		break;
106 	case B43_BAND_5G_MI:
107 		maxpwr = min(sprom->core_pwr_info[0].maxpwr_5g,
108 			     sprom->core_pwr_info[1].maxpwr_5g);
109 		sprom_ofdm_po = sprom->ofdm5gpo;
110 		sprom_mcs_po = sprom->mcs5gpo;
111 		extra_cdd_po = (sprom->cddpo >> 4) & 0xf;
112 		extra_stbc_po = (sprom->stbcpo >> 4) & 0xf;
113 		break;
114 	case B43_BAND_5G_HI:
115 		maxpwr = min(sprom->core_pwr_info[0].maxpwr_5gh,
116 			     sprom->core_pwr_info[1].maxpwr_5gh);
117 		sprom_ofdm_po = sprom->ofdm5ghpo;
118 		sprom_mcs_po = sprom->mcs5ghpo;
119 		extra_cdd_po = (sprom->cddpo >> 12) & 0xf;
120 		extra_stbc_po = (sprom->stbcpo >> 12) & 0xf;
121 		break;
122 	default:
123 		WARN_ON_ONCE(1);
124 		return false;
125 	}
126 
127 	if (band == B43_BAND_2G) {
128 		for (i = 0; i < 4; i++) {
129 			off = ((sprom->cck2gpo >> (i * 4)) & 0xf) * 2;
130 			rates->cck[i] = maxpwr - off;
131 		}
132 	}
133 
134 	/* OFDM */
135 	for (i = 0; i < 8; i++) {
136 		off = ((sprom_ofdm_po >> (i * 4)) & 0xf) * 2;
137 		rates->ofdm[i] = maxpwr - off;
138 	}
139 
140 	/* MCS 20 SISO */
141 	rates->mcs_20[0] = rates->ofdm[0];
142 	rates->mcs_20[1] = rates->ofdm[2];
143 	rates->mcs_20[2] = rates->ofdm[3];
144 	rates->mcs_20[3] = rates->ofdm[4];
145 	rates->mcs_20[4] = rates->ofdm[5];
146 	rates->mcs_20[5] = rates->ofdm[6];
147 	rates->mcs_20[6] = rates->ofdm[7];
148 	rates->mcs_20[7] = rates->ofdm[7];
149 
150 	/* MCS 20 CDD */
151 	for (i = 0; i < 4; i++) {
152 		off = ((sprom_mcs_po[0] >> (i * 4)) & 0xf) * 2;
153 		rates->mcs_20_cdd[i] = maxpwr - off;
154 		if (phy->type == B43_PHYTYPE_N && phy->rev >= 3)
155 			rates->mcs_20_cdd[i] -= extra_cdd_po;
156 	}
157 	for (i = 0; i < 4; i++) {
158 		off = ((sprom_mcs_po[1] >> (i * 4)) & 0xf) * 2;
159 		rates->mcs_20_cdd[4 + i] = maxpwr - off;
160 		if (phy->type == B43_PHYTYPE_N && phy->rev >= 3)
161 			rates->mcs_20_cdd[4 + i] -= extra_cdd_po;
162 	}
163 
164 	/* OFDM 20 CDD */
165 	rates->ofdm_20_cdd[0] = rates->mcs_20_cdd[0];
166 	rates->ofdm_20_cdd[1] = rates->mcs_20_cdd[0];
167 	rates->ofdm_20_cdd[2] = rates->mcs_20_cdd[1];
168 	rates->ofdm_20_cdd[3] = rates->mcs_20_cdd[2];
169 	rates->ofdm_20_cdd[4] = rates->mcs_20_cdd[3];
170 	rates->ofdm_20_cdd[5] = rates->mcs_20_cdd[4];
171 	rates->ofdm_20_cdd[6] = rates->mcs_20_cdd[5];
172 	rates->ofdm_20_cdd[7] = rates->mcs_20_cdd[6];
173 
174 	/* MCS 20 STBC */
175 	for (i = 0; i < 4; i++) {
176 		off = ((sprom_mcs_po[0] >> (i * 4)) & 0xf) * 2;
177 		rates->mcs_20_stbc[i] = maxpwr - off;
178 		if (phy->type == B43_PHYTYPE_N && phy->rev >= 3)
179 			rates->mcs_20_stbc[i] -= extra_stbc_po;
180 	}
181 	for (i = 0; i < 4; i++) {
182 		off = ((sprom_mcs_po[1] >> (i * 4)) & 0xf) * 2;
183 		rates->mcs_20_stbc[4 + i] = maxpwr - off;
184 		if (phy->type == B43_PHYTYPE_N && phy->rev >= 3)
185 			rates->mcs_20_stbc[4 + i] -= extra_stbc_po;
186 	}
187 
188 	/* MCS 20 SDM */
189 	for (i = 0; i < 4; i++) {
190 		off = ((sprom_mcs_po[2] >> (i * 4)) & 0xf) * 2;
191 		rates->mcs_20_sdm[i] = maxpwr - off;
192 	}
193 	for (i = 0; i < 4; i++) {
194 		off = ((sprom_mcs_po[3] >> (i * 4)) & 0xf) * 2;
195 		rates->mcs_20_sdm[4 + i] = maxpwr - off;
196 	}
197 
198 	return true;
199 }
200