1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Broadcom B43 wireless driver
4  * PPR (Power Per Rate) management
5  *
6  * Copyright (c) 2014 Rafał Miłecki <zajec5@gmail.com>
7  */
8 
9 #include "ppr.h"
10 #include "b43.h"
11 
12 #define ppr_for_each_entry(ppr, i, entry)				\
13 	for (i = 0, entry = &(ppr)->__all_rates[i];			\
14 	     i < B43_PPR_RATES_NUM;					\
15 	     i++, entry++)
16 
b43_ppr_clear(struct b43_wldev * dev,struct b43_ppr * ppr)17 void b43_ppr_clear(struct b43_wldev *dev, struct b43_ppr *ppr)
18 {
19 	memset(ppr, 0, sizeof(*ppr));
20 
21 	/* Compile-time PPR check */
22 	BUILD_BUG_ON(sizeof(struct b43_ppr) != B43_PPR_RATES_NUM * sizeof(u8));
23 }
24 
b43_ppr_add(struct b43_wldev * dev,struct b43_ppr * ppr,int diff)25 void b43_ppr_add(struct b43_wldev *dev, struct b43_ppr *ppr, int diff)
26 {
27 	int i;
28 	u8 *rate;
29 
30 	ppr_for_each_entry(ppr, i, rate) {
31 		*rate = clamp_val(*rate + diff, 0, 127);
32 	}
33 }
34 
b43_ppr_apply_max(struct b43_wldev * dev,struct b43_ppr * ppr,u8 max)35 void b43_ppr_apply_max(struct b43_wldev *dev, struct b43_ppr *ppr, u8 max)
36 {
37 	int i;
38 	u8 *rate;
39 
40 	ppr_for_each_entry(ppr, i, rate) {
41 		*rate = min(*rate, max);
42 	}
43 }
44 
b43_ppr_apply_min(struct b43_wldev * dev,struct b43_ppr * ppr,u8 min)45 void b43_ppr_apply_min(struct b43_wldev *dev, struct b43_ppr *ppr, u8 min)
46 {
47 	int i;
48 	u8 *rate;
49 
50 	ppr_for_each_entry(ppr, i, rate) {
51 		*rate = max(*rate, min);
52 	}
53 }
54 
b43_ppr_get_max(struct b43_wldev * dev,struct b43_ppr * ppr)55 u8 b43_ppr_get_max(struct b43_wldev *dev, struct b43_ppr *ppr)
56 {
57 	u8 res = 0;
58 	int i;
59 	u8 *rate;
60 
61 	ppr_for_each_entry(ppr, i, rate) {
62 		res = max(*rate, res);
63 	}
64 
65 	return res;
66 }
67 
b43_ppr_load_max_from_sprom(struct b43_wldev * dev,struct b43_ppr * ppr,enum b43_band band)68 bool b43_ppr_load_max_from_sprom(struct b43_wldev *dev, struct b43_ppr *ppr,
69 				 enum b43_band band)
70 {
71 	struct b43_ppr_rates *rates = &ppr->rates;
72 	struct ssb_sprom *sprom = dev->dev->bus_sprom;
73 	struct b43_phy *phy = &dev->phy;
74 	u8 maxpwr, off;
75 	u32 sprom_ofdm_po;
76 	u16 *sprom_mcs_po;
77 	u8 extra_cdd_po, extra_stbc_po;
78 	int i;
79 
80 	switch (band) {
81 	case B43_BAND_2G:
82 		maxpwr = min(sprom->core_pwr_info[0].maxpwr_2g,
83 			     sprom->core_pwr_info[1].maxpwr_2g);
84 		sprom_ofdm_po = sprom->ofdm2gpo;
85 		sprom_mcs_po = sprom->mcs2gpo;
86 		extra_cdd_po = (sprom->cddpo >> 0) & 0xf;
87 		extra_stbc_po = (sprom->stbcpo >> 0) & 0xf;
88 		break;
89 	case B43_BAND_5G_LO:
90 		maxpwr = min(sprom->core_pwr_info[0].maxpwr_5gl,
91 			     sprom->core_pwr_info[1].maxpwr_5gl);
92 		sprom_ofdm_po = sprom->ofdm5glpo;
93 		sprom_mcs_po = sprom->mcs5glpo;
94 		extra_cdd_po = (sprom->cddpo >> 8) & 0xf;
95 		extra_stbc_po = (sprom->stbcpo >> 8) & 0xf;
96 		break;
97 	case B43_BAND_5G_MI:
98 		maxpwr = min(sprom->core_pwr_info[0].maxpwr_5g,
99 			     sprom->core_pwr_info[1].maxpwr_5g);
100 		sprom_ofdm_po = sprom->ofdm5gpo;
101 		sprom_mcs_po = sprom->mcs5gpo;
102 		extra_cdd_po = (sprom->cddpo >> 4) & 0xf;
103 		extra_stbc_po = (sprom->stbcpo >> 4) & 0xf;
104 		break;
105 	case B43_BAND_5G_HI:
106 		maxpwr = min(sprom->core_pwr_info[0].maxpwr_5gh,
107 			     sprom->core_pwr_info[1].maxpwr_5gh);
108 		sprom_ofdm_po = sprom->ofdm5ghpo;
109 		sprom_mcs_po = sprom->mcs5ghpo;
110 		extra_cdd_po = (sprom->cddpo >> 12) & 0xf;
111 		extra_stbc_po = (sprom->stbcpo >> 12) & 0xf;
112 		break;
113 	default:
114 		WARN_ON_ONCE(1);
115 		return false;
116 	}
117 
118 	if (band == B43_BAND_2G) {
119 		for (i = 0; i < 4; i++) {
120 			off = ((sprom->cck2gpo >> (i * 4)) & 0xf) * 2;
121 			rates->cck[i] = maxpwr - off;
122 		}
123 	}
124 
125 	/* OFDM */
126 	for (i = 0; i < 8; i++) {
127 		off = ((sprom_ofdm_po >> (i * 4)) & 0xf) * 2;
128 		rates->ofdm[i] = maxpwr - off;
129 	}
130 
131 	/* MCS 20 SISO */
132 	rates->mcs_20[0] = rates->ofdm[0];
133 	rates->mcs_20[1] = rates->ofdm[2];
134 	rates->mcs_20[2] = rates->ofdm[3];
135 	rates->mcs_20[3] = rates->ofdm[4];
136 	rates->mcs_20[4] = rates->ofdm[5];
137 	rates->mcs_20[5] = rates->ofdm[6];
138 	rates->mcs_20[6] = rates->ofdm[7];
139 	rates->mcs_20[7] = rates->ofdm[7];
140 
141 	/* MCS 20 CDD */
142 	for (i = 0; i < 4; i++) {
143 		off = ((sprom_mcs_po[0] >> (i * 4)) & 0xf) * 2;
144 		rates->mcs_20_cdd[i] = maxpwr - off;
145 		if (phy->type == B43_PHYTYPE_N && phy->rev >= 3)
146 			rates->mcs_20_cdd[i] -= extra_cdd_po;
147 	}
148 	for (i = 0; i < 4; i++) {
149 		off = ((sprom_mcs_po[1] >> (i * 4)) & 0xf) * 2;
150 		rates->mcs_20_cdd[4 + i] = maxpwr - off;
151 		if (phy->type == B43_PHYTYPE_N && phy->rev >= 3)
152 			rates->mcs_20_cdd[4 + i] -= extra_cdd_po;
153 	}
154 
155 	/* OFDM 20 CDD */
156 	rates->ofdm_20_cdd[0] = rates->mcs_20_cdd[0];
157 	rates->ofdm_20_cdd[1] = rates->mcs_20_cdd[0];
158 	rates->ofdm_20_cdd[2] = rates->mcs_20_cdd[1];
159 	rates->ofdm_20_cdd[3] = rates->mcs_20_cdd[2];
160 	rates->ofdm_20_cdd[4] = rates->mcs_20_cdd[3];
161 	rates->ofdm_20_cdd[5] = rates->mcs_20_cdd[4];
162 	rates->ofdm_20_cdd[6] = rates->mcs_20_cdd[5];
163 	rates->ofdm_20_cdd[7] = rates->mcs_20_cdd[6];
164 
165 	/* MCS 20 STBC */
166 	for (i = 0; i < 4; i++) {
167 		off = ((sprom_mcs_po[0] >> (i * 4)) & 0xf) * 2;
168 		rates->mcs_20_stbc[i] = maxpwr - off;
169 		if (phy->type == B43_PHYTYPE_N && phy->rev >= 3)
170 			rates->mcs_20_stbc[i] -= extra_stbc_po;
171 	}
172 	for (i = 0; i < 4; i++) {
173 		off = ((sprom_mcs_po[1] >> (i * 4)) & 0xf) * 2;
174 		rates->mcs_20_stbc[4 + i] = maxpwr - off;
175 		if (phy->type == B43_PHYTYPE_N && phy->rev >= 3)
176 			rates->mcs_20_stbc[4 + i] -= extra_stbc_po;
177 	}
178 
179 	/* MCS 20 SDM */
180 	for (i = 0; i < 4; i++) {
181 		off = ((sprom_mcs_po[2] >> (i * 4)) & 0xf) * 2;
182 		rates->mcs_20_sdm[i] = maxpwr - off;
183 	}
184 	for (i = 0; i < 4; i++) {
185 		off = ((sprom_mcs_po[3] >> (i * 4)) & 0xf) * 2;
186 		rates->mcs_20_sdm[4 + i] = maxpwr - off;
187 	}
188 
189 	return true;
190 }
191