Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wirel...
[linux-2.6.git] / drivers / net / wireless / iwlwifi / iwl-agn-hcmd.c
1 /******************************************************************************
2  *
3  * GPL LICENSE SUMMARY
4  *
5  * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
6  *
7  * This program is free software; you can redistribute it and/or modify
8  * it under the terms of version 2 of the GNU General Public License as
9  * published by the Free Software Foundation.
10  *
11  * This program is distributed in the hope that it will be useful, but
12  * WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14  * General Public License for more details.
15  *
16  * You should have received a copy of the GNU General Public License
17  * along with this program; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
19  * USA
20  *
21  * The full GNU General Public License is included in this distribution
22  * in the file called LICENSE.GPL.
23  *
24  * Contact Information:
25  *  Intel Linux Wireless <ilw@linux.intel.com>
26  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
27  *
28  *****************************************************************************/
29
30 #include <linux/kernel.h>
31 #include <linux/module.h>
32 #include <linux/init.h>
33 #include <linux/sched.h>
34
35 #include "iwl-dev.h"
36 #include "iwl-core.h"
37 #include "iwl-io.h"
38 #include "iwl-agn.h"
39
40 int iwlagn_send_tx_ant_config(struct iwl_priv *priv, u8 valid_tx_ant)
41 {
42         struct iwl_tx_ant_config_cmd tx_ant_cmd = {
43           .valid = cpu_to_le32(valid_tx_ant),
44         };
45
46         if (IWL_UCODE_API(priv->ucode_ver) > 1) {
47                 IWL_DEBUG_HC(priv, "select valid tx ant: %u\n", valid_tx_ant);
48                 return iwl_send_cmd_pdu(priv, TX_ANT_CONFIGURATION_CMD,
49                                         sizeof(struct iwl_tx_ant_config_cmd),
50                                         &tx_ant_cmd);
51         } else {
52                 IWL_DEBUG_HC(priv, "TX_ANT_CONFIGURATION_CMD not supported\n");
53                 return -EOPNOTSUPP;
54         }
55 }
56
57 static u16 iwlagn_build_addsta_hcmd(const struct iwl_addsta_cmd *cmd, u8 *data)
58 {
59         u16 size = (u16)sizeof(struct iwl_addsta_cmd);
60         struct iwl_addsta_cmd *addsta = (struct iwl_addsta_cmd *)data;
61         memcpy(addsta, cmd, size);
62         /* resrved in 5000 */
63         addsta->rate_n_flags = cpu_to_le16(0);
64         return size;
65 }
66
67 static void iwlagn_gain_computation(struct iwl_priv *priv,
68                 u32 average_noise[NUM_RX_CHAINS],
69                 u16 min_average_noise_antenna_i,
70                 u32 min_average_noise,
71                 u8 default_chain)
72 {
73         int i;
74         s32 delta_g;
75         struct iwl_chain_noise_data *data = &priv->chain_noise_data;
76
77         /*
78          * Find Gain Code for the chains based on "default chain"
79          */
80         for (i = default_chain + 1; i < NUM_RX_CHAINS; i++) {
81                 if ((data->disconn_array[i])) {
82                         data->delta_gain_code[i] = 0;
83                         continue;
84                 }
85
86                 delta_g = (priv->cfg->base_params->chain_noise_scale *
87                         ((s32)average_noise[default_chain] -
88                         (s32)average_noise[i])) / 1500;
89
90                 /* bound gain by 2 bits value max, 3rd bit is sign */
91                 data->delta_gain_code[i] =
92                         min(abs(delta_g), (long) CHAIN_NOISE_MAX_DELTA_GAIN_CODE);
93
94                 if (delta_g < 0)
95                         /*
96                          * set negative sign ...
97                          * note to Intel developers:  This is uCode API format,
98                          *   not the format of any internal device registers.
99                          *   Do not change this format for e.g. 6050 or similar
100                          *   devices.  Change format only if more resolution
101                          *   (i.e. more than 2 bits magnitude) is needed.
102                          */
103                         data->delta_gain_code[i] |= (1 << 2);
104         }
105
106         IWL_DEBUG_CALIB(priv, "Delta gains: ANT_B = %d  ANT_C = %d\n",
107                         data->delta_gain_code[1], data->delta_gain_code[2]);
108
109         if (!data->radio_write) {
110                 struct iwl_calib_chain_noise_gain_cmd cmd;
111
112                 memset(&cmd, 0, sizeof(cmd));
113
114                 cmd.hdr.op_code = priv->_agn.phy_calib_chain_noise_gain_cmd;
115                 cmd.hdr.first_group = 0;
116                 cmd.hdr.groups_num = 1;
117                 cmd.hdr.data_valid = 1;
118                 cmd.delta_gain_1 = data->delta_gain_code[1];
119                 cmd.delta_gain_2 = data->delta_gain_code[2];
120                 iwl_send_cmd_pdu_async(priv, REPLY_PHY_CALIBRATION_CMD,
121                         sizeof(cmd), &cmd, NULL);
122
123                 data->radio_write = 1;
124                 data->state = IWL_CHAIN_NOISE_CALIBRATED;
125         }
126 }
127
128 static void iwlagn_chain_noise_reset(struct iwl_priv *priv)
129 {
130         struct iwl_chain_noise_data *data = &priv->chain_noise_data;
131         int ret;
132
133         if ((data->state == IWL_CHAIN_NOISE_ALIVE) &&
134             iwl_is_any_associated(priv)) {
135                 struct iwl_calib_chain_noise_reset_cmd cmd;
136
137                 /* clear data for chain noise calibration algorithm */
138                 data->chain_noise_a = 0;
139                 data->chain_noise_b = 0;
140                 data->chain_noise_c = 0;
141                 data->chain_signal_a = 0;
142                 data->chain_signal_b = 0;
143                 data->chain_signal_c = 0;
144                 data->beacon_count = 0;
145
146                 memset(&cmd, 0, sizeof(cmd));
147                 cmd.hdr.op_code = priv->_agn.phy_calib_chain_noise_reset_cmd;
148                 cmd.hdr.first_group = 0;
149                 cmd.hdr.groups_num = 1;
150                 cmd.hdr.data_valid = 1;
151                 ret = iwl_send_cmd_pdu(priv, REPLY_PHY_CALIBRATION_CMD,
152                                         sizeof(cmd), &cmd);
153                 if (ret)
154                         IWL_ERR(priv,
155                                 "Could not send REPLY_PHY_CALIBRATION_CMD\n");
156                 data->state = IWL_CHAIN_NOISE_ACCUMULATE;
157                 IWL_DEBUG_CALIB(priv, "Run chain_noise_calibrate\n");
158         }
159 }
160
161 static void iwlagn_tx_cmd_protection(struct iwl_priv *priv,
162                                      struct ieee80211_tx_info *info,
163                                      __le16 fc, __le32 *tx_flags)
164 {
165         if (info->control.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS ||
166             info->control.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT ||
167             info->flags & IEEE80211_TX_CTL_AMPDU)
168                 *tx_flags |= TX_CMD_FLG_PROT_REQUIRE_MSK;
169 }
170
171 /* Calc max signal level (dBm) among 3 possible receivers */
172 static int iwlagn_calc_rssi(struct iwl_priv *priv,
173                              struct iwl_rx_phy_res *rx_resp)
174 {
175         /* data from PHY/DSP regarding signal strength, etc.,
176          *   contents are always there, not configurable by host
177          */
178         struct iwlagn_non_cfg_phy *ncphy =
179                 (struct iwlagn_non_cfg_phy *)rx_resp->non_cfg_phy_buf;
180         u32 val, rssi_a, rssi_b, rssi_c, max_rssi;
181         u8 agc;
182
183         val  = le32_to_cpu(ncphy->non_cfg_phy[IWLAGN_RX_RES_AGC_IDX]);
184         agc = (val & IWLAGN_OFDM_AGC_MSK) >> IWLAGN_OFDM_AGC_BIT_POS;
185
186         /* Find max rssi among 3 possible receivers.
187          * These values are measured by the digital signal processor (DSP).
188          * They should stay fairly constant even as the signal strength varies,
189          *   if the radio's automatic gain control (AGC) is working right.
190          * AGC value (see below) will provide the "interesting" info.
191          */
192         val = le32_to_cpu(ncphy->non_cfg_phy[IWLAGN_RX_RES_RSSI_AB_IDX]);
193         rssi_a = (val & IWLAGN_OFDM_RSSI_INBAND_A_BITMSK) >>
194                 IWLAGN_OFDM_RSSI_A_BIT_POS;
195         rssi_b = (val & IWLAGN_OFDM_RSSI_INBAND_B_BITMSK) >>
196                 IWLAGN_OFDM_RSSI_B_BIT_POS;
197         val = le32_to_cpu(ncphy->non_cfg_phy[IWLAGN_RX_RES_RSSI_C_IDX]);
198         rssi_c = (val & IWLAGN_OFDM_RSSI_INBAND_C_BITMSK) >>
199                 IWLAGN_OFDM_RSSI_C_BIT_POS;
200
201         max_rssi = max_t(u32, rssi_a, rssi_b);
202         max_rssi = max_t(u32, max_rssi, rssi_c);
203
204         IWL_DEBUG_STATS(priv, "Rssi In A %d B %d C %d Max %d AGC dB %d\n",
205                 rssi_a, rssi_b, rssi_c, max_rssi, agc);
206
207         /* dBm = max_rssi dB - agc dB - constant.
208          * Higher AGC (higher radio gain) means lower signal. */
209         return max_rssi - agc - IWLAGN_RSSI_OFFSET;
210 }
211
212 static int iwlagn_set_pan_params(struct iwl_priv *priv)
213 {
214         struct iwl_wipan_params_cmd cmd;
215         struct iwl_rxon_context *ctx_bss, *ctx_pan;
216         int slot0 = 300, slot1 = 0;
217         int ret;
218
219         if (priv->valid_contexts == BIT(IWL_RXON_CTX_BSS))
220                 return 0;
221
222         BUILD_BUG_ON(NUM_IWL_RXON_CTX != 2);
223
224         lockdep_assert_held(&priv->mutex);
225
226         ctx_bss = &priv->contexts[IWL_RXON_CTX_BSS];
227         ctx_pan = &priv->contexts[IWL_RXON_CTX_PAN];
228
229         /*
230          * If the PAN context is inactive, then we don't need
231          * to update the PAN parameters, the last thing we'll
232          * have done before it goes inactive is making the PAN
233          * parameters be WLAN-only.
234          */
235         if (!ctx_pan->is_active)
236                 return 0;
237
238         memset(&cmd, 0, sizeof(cmd));
239
240         /* only 2 slots are currently allowed */
241         cmd.num_slots = 2;
242
243         cmd.slots[0].type = 0; /* BSS */
244         cmd.slots[1].type = 1; /* PAN */
245
246         if (priv->_agn.hw_roc_channel) {
247                 /* both contexts must be used for this to happen */
248                 slot1 = priv->_agn.hw_roc_duration;
249                 slot0 = IWL_MIN_SLOT_TIME;
250         } else if (ctx_bss->vif && ctx_pan->vif) {
251                 int bcnint = ctx_pan->vif->bss_conf.beacon_int;
252                 int dtim = ctx_pan->vif->bss_conf.dtim_period ?: 1;
253
254                 /* should be set, but seems unused?? */
255                 cmd.flags |= cpu_to_le16(IWL_WIPAN_PARAMS_FLG_SLOTTED_MODE);
256
257                 if (ctx_pan->vif->type == NL80211_IFTYPE_AP &&
258                     bcnint &&
259                     bcnint != ctx_bss->vif->bss_conf.beacon_int) {
260                         IWL_ERR(priv,
261                                 "beacon intervals don't match (%d, %d)\n",
262                                 ctx_bss->vif->bss_conf.beacon_int,
263                                 ctx_pan->vif->bss_conf.beacon_int);
264                 } else
265                         bcnint = max_t(int, bcnint,
266                                        ctx_bss->vif->bss_conf.beacon_int);
267                 if (!bcnint)
268                         bcnint = DEFAULT_BEACON_INTERVAL;
269                 slot0 = bcnint / 2;
270                 slot1 = bcnint - slot0;
271
272                 if (test_bit(STATUS_SCAN_HW, &priv->status) ||
273                     (!ctx_bss->vif->bss_conf.idle &&
274                      !ctx_bss->vif->bss_conf.assoc)) {
275                         slot0 = dtim * bcnint * 3 - IWL_MIN_SLOT_TIME;
276                         slot1 = IWL_MIN_SLOT_TIME;
277                 } else if (!ctx_pan->vif->bss_conf.idle &&
278                            !ctx_pan->vif->bss_conf.assoc) {
279                         slot1 = bcnint * 3 - IWL_MIN_SLOT_TIME;
280                         slot0 = IWL_MIN_SLOT_TIME;
281                 }
282         } else if (ctx_pan->vif) {
283                 slot0 = 0;
284                 slot1 = max_t(int, 1, ctx_pan->vif->bss_conf.dtim_period) *
285                                         ctx_pan->vif->bss_conf.beacon_int;
286                 slot1 = max_t(int, DEFAULT_BEACON_INTERVAL, slot1);
287
288                 if (test_bit(STATUS_SCAN_HW, &priv->status)) {
289                         slot0 = slot1 * 3 - IWL_MIN_SLOT_TIME;
290                         slot1 = IWL_MIN_SLOT_TIME;
291                 }
292         }
293
294         cmd.slots[0].width = cpu_to_le16(slot0);
295         cmd.slots[1].width = cpu_to_le16(slot1);
296
297         ret = iwl_send_cmd_pdu(priv, REPLY_WIPAN_PARAMS, sizeof(cmd), &cmd);
298         if (ret)
299                 IWL_ERR(priv, "Error setting PAN parameters (%d)\n", ret);
300
301         return ret;
302 }
303
304 struct iwl_hcmd_ops iwlagn_hcmd = {
305         .set_rxon_chain = iwlagn_set_rxon_chain,
306         .set_tx_ant = iwlagn_send_tx_ant_config,
307         .send_bt_config = iwl_send_bt_config,
308         .set_pan_params = iwlagn_set_pan_params,
309 };
310
311 struct iwl_hcmd_ops iwlagn_bt_hcmd = {
312         .set_rxon_chain = iwlagn_set_rxon_chain,
313         .set_tx_ant = iwlagn_send_tx_ant_config,
314         .send_bt_config = iwlagn_send_advance_bt_config,
315         .set_pan_params = iwlagn_set_pan_params,
316 };
317
318 struct iwl_hcmd_utils_ops iwlagn_hcmd_utils = {
319         .build_addsta_hcmd = iwlagn_build_addsta_hcmd,
320         .gain_computation = iwlagn_gain_computation,
321         .chain_noise_reset = iwlagn_chain_noise_reset,
322         .tx_cmd_protection = iwlagn_tx_cmd_protection,
323         .calc_rssi = iwlagn_calc_rssi,
324         .request_scan = iwlagn_request_scan,
325 };