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antsel.c
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1 /*
2  * Copyright (c) 2010 Broadcom Corporation
3  *
4  * Permission to use, copy, modify, and/or distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
11  * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
13  * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
14  * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include <linux/slab.h>
18 #include <net/mac80211.h>
19 
20 #include "types.h"
21 #include "main.h"
22 #include "phy_shim.h"
23 #include "antsel.h"
24 
25 #define ANT_SELCFG_AUTO 0x80 /* bit indicates antenna sel AUTO */
26 #define ANT_SELCFG_MASK 0x33 /* antenna configuration mask */
27 #define ANT_SELCFG_TX_UNICAST 0 /* unicast tx antenna configuration */
28 #define ANT_SELCFG_RX_UNICAST 1 /* unicast rx antenna configuration */
29 #define ANT_SELCFG_TX_DEF 2 /* default tx antenna configuration */
30 #define ANT_SELCFG_RX_DEF 3 /* default rx antenna configuration */
31 
32 /* useful macros */
33 #define BRCMS_ANTSEL_11N_0(ant) ((((ant) & ANT_SELCFG_MASK) >> 4) & 0xf)
34 #define BRCMS_ANTSEL_11N_1(ant) (((ant) & ANT_SELCFG_MASK) & 0xf)
35 #define BRCMS_ANTIDX_11N(ant) (((BRCMS_ANTSEL_11N_0(ant)) << 2) +\
36  (BRCMS_ANTSEL_11N_1(ant)))
37 #define BRCMS_ANT_ISAUTO_11N(ant) (((ant) & ANT_SELCFG_AUTO) == ANT_SELCFG_AUTO)
38 #define BRCMS_ANTSEL_11N(ant) ((ant) & ANT_SELCFG_MASK)
39 
40 /* antenna switch */
41 /* defines for no boardlevel antenna diversity */
42 #define ANT_SELCFG_DEF_2x2 0x01 /* default antenna configuration */
43 
44 /* 2x3 antdiv defines and tables for GPIO communication */
45 #define ANT_SELCFG_NUM_2x3 3
46 #define ANT_SELCFG_DEF_2x3 0x01 /* default antenna configuration */
47 
48 /* 2x4 antdiv rev4 defines and tables for GPIO communication */
49 #define ANT_SELCFG_NUM_2x4 4
50 #define ANT_SELCFG_DEF_2x4 0x02 /* default antenna configuration */
51 
52 static const u16 mimo_2x4_div_antselpat_tbl[] = {
53  0, 0, 0x9, 0xa, /* ant0: 0 ant1: 2,3 */
54  0, 0, 0x5, 0x6, /* ant0: 1 ant1: 2,3 */
55  0, 0, 0, 0, /* n.a. */
56  0, 0, 0, 0 /* n.a. */
57 };
58 
59 static const u8 mimo_2x4_div_antselid_tbl[16] = {
60  0, 0, 0, 0, 0, 2, 3, 0,
61  0, 0, 1, 0, 0, 0, 0, 0 /* pat to antselid */
62 };
63 
64 static const u16 mimo_2x3_div_antselpat_tbl[] = {
65  16, 0, 1, 16, /* ant0: 0 ant1: 1,2 */
66  16, 16, 16, 16, /* n.a. */
67  16, 2, 16, 16, /* ant0: 2 ant1: 1 */
68  16, 16, 16, 16 /* n.a. */
69 };
70 
71 static const u8 mimo_2x3_div_antselid_tbl[16] = {
72  0, 1, 2, 0, 0, 0, 0, 0,
73  0, 0, 0, 0, 0, 0, 0, 0 /* pat to antselid */
74 };
75 
76 /* boardlevel antenna selection: init antenna selection structure */
77 static void
78 brcms_c_antsel_init_cfg(struct antsel_info *asi, struct brcms_antselcfg *antsel,
79  bool auto_sel)
80 {
81  if (asi->antsel_type == ANTSEL_2x3) {
82  u8 antcfg_def = ANT_SELCFG_DEF_2x3 |
83  ((asi->antsel_avail && auto_sel) ? ANT_SELCFG_AUTO : 0);
84  antsel->ant_config[ANT_SELCFG_TX_DEF] = antcfg_def;
85  antsel->ant_config[ANT_SELCFG_TX_UNICAST] = antcfg_def;
86  antsel->ant_config[ANT_SELCFG_RX_DEF] = antcfg_def;
87  antsel->ant_config[ANT_SELCFG_RX_UNICAST] = antcfg_def;
88  antsel->num_antcfg = ANT_SELCFG_NUM_2x3;
89 
90  } else if (asi->antsel_type == ANTSEL_2x4) {
91 
92  antsel->ant_config[ANT_SELCFG_TX_DEF] = ANT_SELCFG_DEF_2x4;
93  antsel->ant_config[ANT_SELCFG_TX_UNICAST] = ANT_SELCFG_DEF_2x4;
94  antsel->ant_config[ANT_SELCFG_RX_DEF] = ANT_SELCFG_DEF_2x4;
95  antsel->ant_config[ANT_SELCFG_RX_UNICAST] = ANT_SELCFG_DEF_2x4;
96  antsel->num_antcfg = ANT_SELCFG_NUM_2x4;
97 
98  } else { /* no antenna selection available */
99 
100  antsel->ant_config[ANT_SELCFG_TX_DEF] = ANT_SELCFG_DEF_2x2;
101  antsel->ant_config[ANT_SELCFG_TX_UNICAST] = ANT_SELCFG_DEF_2x2;
102  antsel->ant_config[ANT_SELCFG_RX_DEF] = ANT_SELCFG_DEF_2x2;
103  antsel->ant_config[ANT_SELCFG_RX_UNICAST] = ANT_SELCFG_DEF_2x2;
104  antsel->num_antcfg = 0;
105  }
106 }
107 
108 struct antsel_info *brcms_c_antsel_attach(struct brcms_c_info *wlc)
109 {
110  struct antsel_info *asi;
111  struct ssb_sprom *sprom = &wlc->hw->d11core->bus->sprom;
112 
113  asi = kzalloc(sizeof(struct antsel_info), GFP_ATOMIC);
114  if (!asi)
115  return NULL;
116 
117  asi->wlc = wlc;
118  asi->pub = wlc->pub;
119  asi->antsel_type = ANTSEL_NA;
120  asi->antsel_avail = false;
121  asi->antsel_antswitch = sprom->antswitch;
122 
123  if ((asi->pub->sromrev >= 4) && (asi->antsel_antswitch != 0)) {
124  switch (asi->antsel_antswitch) {
125  case ANTSWITCH_TYPE_1:
126  case ANTSWITCH_TYPE_2:
127  case ANTSWITCH_TYPE_3:
128  /* 4321/2 board with 2x3 switch logic */
129  asi->antsel_type = ANTSEL_2x3;
130  /* Antenna selection availability */
131  if ((sprom->ant_available_bg == 7) ||
132  (sprom->ant_available_a == 7)) {
133  asi->antsel_avail = true;
134  } else if (
135  sprom->ant_available_bg == 3 ||
136  sprom->ant_available_a == 3) {
137  asi->antsel_avail = false;
138  } else {
139  asi->antsel_avail = false;
140  wiphy_err(wlc->wiphy, "antsel_attach: 2o3 "
141  "board cfg invalid\n");
142  }
143 
144  break;
145  default:
146  break;
147  }
148  } else if ((asi->pub->sromrev == 4) &&
149  (sprom->ant_available_bg == 7) &&
150  (sprom->ant_available_a == 0)) {
151  /* hack to match old 4321CB2 cards with 2of3 antenna switch */
152  asi->antsel_type = ANTSEL_2x3;
153  asi->antsel_avail = true;
154  } else if (asi->pub->boardflags2 & BFL2_2X4_DIV) {
155  asi->antsel_type = ANTSEL_2x4;
156  asi->antsel_avail = true;
157  }
158 
159  /* Set the antenna selection type for the low driver */
160  brcms_b_antsel_type_set(wlc->hw, asi->antsel_type);
161 
162  /* Init (auto/manual) antenna selection */
163  brcms_c_antsel_init_cfg(asi, &asi->antcfg_11n, true);
164  brcms_c_antsel_init_cfg(asi, &asi->antcfg_cur, true);
165 
166  return asi;
167 }
168 
169 void brcms_c_antsel_detach(struct antsel_info *asi)
170 {
171  kfree(asi);
172 }
173 
174 /*
175  * boardlevel antenna selection:
176  * convert ant_cfg to mimo_antsel (ucode interface)
177  */
178 static u16 brcms_c_antsel_antcfg2antsel(struct antsel_info *asi, u8 ant_cfg)
179 {
180  u8 idx = BRCMS_ANTIDX_11N(BRCMS_ANTSEL_11N(ant_cfg));
181  u16 mimo_antsel = 0;
182 
183  if (asi->antsel_type == ANTSEL_2x4) {
184  /* 2x4 antenna diversity board, 4 cfgs: 0-2 0-3 1-2 1-3 */
185  mimo_antsel = (mimo_2x4_div_antselpat_tbl[idx] & 0xf);
186  return mimo_antsel;
187 
188  } else if (asi->antsel_type == ANTSEL_2x3) {
189  /* 2x3 antenna selection, 3 cfgs: 0-1 0-2 2-1 */
190  mimo_antsel = (mimo_2x3_div_antselpat_tbl[idx] & 0xf);
191  return mimo_antsel;
192  }
193 
194  return mimo_antsel;
195 }
196 
197 /* boardlevel antenna selection: ucode interface control */
198 static int brcms_c_antsel_cfgupd(struct antsel_info *asi,
199  struct brcms_antselcfg *antsel)
200 {
201  struct brcms_c_info *wlc = asi->wlc;
202  u8 ant_cfg;
203  u16 mimo_antsel;
204 
205  /* 1) Update TX antconfig for all frames that are not unicast data
206  * (aka default TX)
207  */
208  ant_cfg = antsel->ant_config[ANT_SELCFG_TX_DEF];
209  mimo_antsel = brcms_c_antsel_antcfg2antsel(asi, ant_cfg);
210  brcms_b_write_shm(wlc->hw, M_MIMO_ANTSEL_TXDFLT, mimo_antsel);
211  /*
212  * Update driver stats for currently selected
213  * default tx/rx antenna config
214  */
215  asi->antcfg_cur.ant_config[ANT_SELCFG_TX_DEF] = ant_cfg;
216 
217  /* 2) Update RX antconfig for all frames that are not unicast data
218  * (aka default RX)
219  */
220  ant_cfg = antsel->ant_config[ANT_SELCFG_RX_DEF];
221  mimo_antsel = brcms_c_antsel_antcfg2antsel(asi, ant_cfg);
222  brcms_b_write_shm(wlc->hw, M_MIMO_ANTSEL_RXDFLT, mimo_antsel);
223  /*
224  * Update driver stats for currently selected
225  * default tx/rx antenna config
226  */
227  asi->antcfg_cur.ant_config[ANT_SELCFG_RX_DEF] = ant_cfg;
228 
229  return 0;
230 }
231 
232 void brcms_c_antsel_init(struct antsel_info *asi)
233 {
234  if ((asi->antsel_type == ANTSEL_2x3) ||
235  (asi->antsel_type == ANTSEL_2x4))
236  brcms_c_antsel_cfgupd(asi, &asi->antcfg_11n);
237 }
238 
239 /* boardlevel antenna selection: convert id to ant_cfg */
240 static u8 brcms_c_antsel_id2antcfg(struct antsel_info *asi, u8 id)
241 {
242  u8 antcfg = ANT_SELCFG_DEF_2x2;
243 
244  if (asi->antsel_type == ANTSEL_2x4) {
245  /* 2x4 antenna diversity board, 4 cfgs: 0-2 0-3 1-2 1-3 */
246  antcfg = (((id & 0x2) << 3) | ((id & 0x1) + 2));
247  return antcfg;
248 
249  } else if (asi->antsel_type == ANTSEL_2x3) {
250  /* 2x3 antenna selection, 3 cfgs: 0-1 0-2 2-1 */
251  antcfg = (((id & 0x02) << 4) | ((id & 0x1) + 1));
252  return antcfg;
253  }
254 
255  return antcfg;
256 }
257 
258 void
259 brcms_c_antsel_antcfg_get(struct antsel_info *asi, bool usedef, bool sel,
260  u8 antselid, u8 fbantselid, u8 *antcfg,
261  u8 *fbantcfg)
262 {
263  u8 ant;
264 
265  /* if use default, assign it and return */
266  if (usedef) {
267  *antcfg = asi->antcfg_11n.ant_config[ANT_SELCFG_TX_DEF];
268  *fbantcfg = *antcfg;
269  return;
270  }
271 
272  if (!sel) {
273  *antcfg = asi->antcfg_11n.ant_config[ANT_SELCFG_TX_UNICAST];
274  *fbantcfg = *antcfg;
275 
276  } else {
277  ant = asi->antcfg_11n.ant_config[ANT_SELCFG_TX_UNICAST];
278  if ((ant & ANT_SELCFG_AUTO) == ANT_SELCFG_AUTO) {
279  *antcfg = brcms_c_antsel_id2antcfg(asi, antselid);
280  *fbantcfg = brcms_c_antsel_id2antcfg(asi, fbantselid);
281  } else {
282  *antcfg =
283  asi->antcfg_11n.ant_config[ANT_SELCFG_TX_UNICAST];
284  *fbantcfg = *antcfg;
285  }
286  }
287  return;
288 }
289 
290 /* boardlevel antenna selection: convert mimo_antsel (ucode interface) to id */
291 u8 brcms_c_antsel_antsel2id(struct antsel_info *asi, u16 antsel)
292 {
293  u8 antselid = 0;
294 
295  if (asi->antsel_type == ANTSEL_2x4) {
296  /* 2x4 antenna diversity board, 4 cfgs: 0-2 0-3 1-2 1-3 */
297  antselid = mimo_2x4_div_antselid_tbl[(antsel & 0xf)];
298  return antselid;
299 
300  } else if (asi->antsel_type == ANTSEL_2x3) {
301  /* 2x3 antenna selection, 3 cfgs: 0-1 0-2 2-1 */
302  antselid = mimo_2x3_div_antselid_tbl[(antsel & 0xf)];
303  return antselid;
304  }
305 
306  return antselid;
307 }
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