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                 iwl_set_calib_hdr(&cmd.hdr,
 115                         priv->_agn.phy_calib_chain_noise_gain_cmd);
 116                 cmd.delta_gain_1 = data->delta_gain_code[1];
 117                 cmd.delta_gain_2 = data->delta_gain_code[2];
 118                 iwl_send_cmd_pdu_async(priv, REPLY_PHY_CALIBRATION_CMD,
 119                         sizeof(cmd), &cmd, NULL);
 120
 121                 data->radio_write = 1;
 122                 data->state = IWL_CHAIN_NOISE_CALIBRATED;
 123         }
 124 }
 125
 126 static void iwlagn_chain_noise_reset(struct iwl_priv *priv)
 127 {
 128         struct iwl_chain_noise_data *data = &priv->chain_noise_data;
 129         int ret;
 130
 131         if ((data->state == IWL_CHAIN_NOISE_ALIVE) &&
 132             iwl_is_any_associated(priv)) {
 133                 struct iwl_calib_chain_noise_reset_cmd cmd;
 134
 135                 /* clear data for chain noise calibration algorithm */
 136                 data->chain_noise_a = 0;
 137                 data->chain_noise_b = 0;
 138                 data->chain_noise_c = 0;
 139                 data->chain_signal_a = 0;
 140                 data->chain_signal_b = 0;
 141                 data->chain_signal_c = 0;
 142                 data->beacon_count = 0;
 143
 144                 memset(&cmd, 0, sizeof(cmd));
 145                 iwl_set_calib_hdr(&cmd.hdr,
 146                         priv->_agn.phy_calib_chain_noise_reset_cmd);
 147                 ret = iwl_send_cmd_pdu(priv, REPLY_PHY_CALIBRATION_CMD,
 148                                         sizeof(cmd), &cmd);
 149                 if (ret)
 150                         IWL_ERR(priv,
 151                                 "Could not send REPLY_PHY_CALIBRATION_CMD\n");
 152                 data->state = IWL_CHAIN_NOISE_ACCUMULATE;
 153                 IWL_DEBUG_CALIB(priv, "Run chain_noise_calibrate\n");
 154         }
 155 }
 156
 157 static void iwlagn_tx_cmd_protection(struct iwl_priv *priv,
 158                                      struct ieee80211_tx_info *info,
 159                                      __le16 fc, __le32 *tx_flags)
 160 {
 161         if (info->control.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS ||
 162             info->control.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT ||
 163             info->flags & IEEE80211_TX_CTL_AMPDU)
 164                 *tx_flags |= TX_CMD_FLG_PROT_REQUIRE_MSK;
 165 }
 166
 167 /* Calc max signal level (dBm) among 3 possible receivers */
 168 static int iwlagn_calc_rssi(struct iwl_priv *priv,
 169                              struct iwl_rx_phy_res *rx_resp)
 170 {
 171         /* data from PHY/DSP regarding signal strength, etc.,
 172          *   contents are always there, not configurable by host
 173          */
 174         struct iwlagn_non_cfg_phy *ncphy =
 175                 (struct iwlagn_non_cfg_phy *)rx_resp->non_cfg_phy_buf;
 176         u32 val, rssi_a, rssi_b, rssi_c, max_rssi;
 177         u8 agc;
 178
 179         val  = le32_to_cpu(ncphy->non_cfg_phy[IWLAGN_RX_RES_AGC_IDX]);
 180         agc = (val & IWLAGN_OFDM_AGC_MSK) >> IWLAGN_OFDM_AGC_BIT_POS;
 181
 182         /* Find max rssi among 3 possible receivers.
 183          * These values are measured by the digital signal processor (DSP).
 184          * They should stay fairly constant even as the signal strength varies,
 185          *   if the radio's automatic gain control (AGC) is working right.
 186          * AGC value (see below) will provide the "interesting" info.
 187          */
 188         val = le32_to_cpu(ncphy->non_cfg_phy[IWLAGN_RX_RES_RSSI_AB_IDX]);
 189         rssi_a = (val & IWLAGN_OFDM_RSSI_INBAND_A_BITMSK) >>
 190                 IWLAGN_OFDM_RSSI_A_BIT_POS;
 191         rssi_b = (val & IWLAGN_OFDM_RSSI_INBAND_B_BITMSK) >>
 192                 IWLAGN_OFDM_RSSI_B_BIT_POS;
 193         val = le32_to_cpu(ncphy->non_cfg_phy[IWLAGN_RX_RES_RSSI_C_IDX]);
 194         rssi_c = (val & IWLAGN_OFDM_RSSI_INBAND_C_BITMSK) >>
 195                 IWLAGN_OFDM_RSSI_C_BIT_POS;
 196
 197         max_rssi = max_t(u32, rssi_a, rssi_b);
 198         max_rssi = max_t(u32, max_rssi, rssi_c);
 199
 200         IWL_DEBUG_STATS(priv, "Rssi In A %d B %d C %d Max %d AGC dB %d\n",
 201                 rssi_a, rssi_b, rssi_c, max_rssi, agc);
 202
 203         /* dBm = max_rssi dB - agc dB - constant.
 204          * Higher AGC (higher radio gain) means lower signal. */
 205         return max_rssi - agc - IWLAGN_RSSI_OFFSET;
 206 }
 207
 208 static int iwlagn_set_pan_params(struct iwl_priv *priv)
 209 {
 210         struct iwl_wipan_params_cmd cmd;
 211         struct iwl_rxon_context *ctx_bss, *ctx_pan;
 212         int slot0 = 300, slot1 = 0;
 213         int ret;
 214
 215         if (priv->valid_contexts == BIT(IWL_RXON_CTX_BSS))
 216                 return 0;
 217
 218         BUILD_BUG_ON(NUM_IWL_RXON_CTX != 2);
 219
 220         lockdep_assert_held(&priv->mutex);
 221
 222         ctx_bss = &priv->contexts[IWL_RXON_CTX_BSS];
 223         ctx_pan = &priv->contexts[IWL_RXON_CTX_PAN];
 224
 225         /*
 226          * If the PAN context is inactive, then we don't need
 227          * to update the PAN parameters, the last thing we'll
 228          * have done before it goes inactive is making the PAN
 229          * parameters be WLAN-only.
 230          */
 231         if (!ctx_pan->is_active)
 232                 return 0;
 233
 234         memset(&cmd, 0, sizeof(cmd));
 235
 236         /* only 2 slots are currently allowed */
 237         cmd.num_slots = 2;
 238
 239         cmd.slots[0].type = 0; /* BSS */
 240         cmd.slots[1].type = 1; /* PAN */
 241
 242         if (priv->_agn.hw_roc_channel) {
 243                 /* both contexts must be used for this to happen */
 244                 slot1 = priv->_agn.hw_roc_duration;
 245                 slot0 = IWL_MIN_SLOT_TIME;
 246         } else if (ctx_bss->vif && ctx_pan->vif) {
 247                 int bcnint = ctx_pan->vif->bss_conf.beacon_int;
 248                 int dtim = ctx_pan->vif->bss_conf.dtim_period ?: 1;
 249
 250                 /* should be set, but seems unused?? */
 251                 cmd.flags |= cpu_to_le16(IWL_WIPAN_PARAMS_FLG_SLOTTED_MODE);
 252
 253                 if (ctx_pan->vif->type == NL80211_IFTYPE_AP &&
 254                     bcnint &&
 255                     bcnint != ctx_bss->vif->bss_conf.beacon_int) {
 256                         IWL_ERR(priv,
 257                                 "beacon intervals don't match (%d, %d)\n",
 258                                 ctx_bss->vif->bss_conf.beacon_int,
 259                                 ctx_pan->vif->bss_conf.beacon_int);
 260                 } else
 261                         bcnint = max_t(int, bcnint,
 262                                        ctx_bss->vif->bss_conf.beacon_int);
 263                 if (!bcnint)
 264                         bcnint = DEFAULT_BEACON_INTERVAL;
 265                 slot0 = bcnint / 2;
 266                 slot1 = bcnint - slot0;
 267
 268                 if (test_bit(STATUS_SCAN_HW, &priv->status) ||
 269                     (!ctx_bss->vif->bss_conf.idle &&
 270                      !ctx_bss->vif->bss_conf.assoc)) {
 271                         slot0 = dtim * bcnint * 3 - IWL_MIN_SLOT_TIME;
 272                         slot1 = IWL_MIN_SLOT_TIME;
 273                 } else if (!ctx_pan->vif->bss_conf.idle &&
 274                            !ctx_pan->vif->bss_conf.assoc) {
 275                         slot1 = bcnint * 3 - IWL_MIN_SLOT_TIME;
 276                         slot0 = IWL_MIN_SLOT_TIME;
 277                 }
 278         } else if (ctx_pan->vif) {
 279                 slot0 = 0;
 280                 slot1 = max_t(int, 1, ctx_pan->vif->bss_conf.dtim_period) *
 281                                         ctx_pan->vif->bss_conf.beacon_int;
 282                 slot1 = max_t(int, DEFAULT_BEACON_INTERVAL, slot1);
 283
 284                 if (test_bit(STATUS_SCAN_HW, &priv->status)) {
 285                         slot0 = slot1 * 3 - IWL_MIN_SLOT_TIME;
 286                         slot1 = IWL_MIN_SLOT_TIME;
 287                 }
 288         }
 289
 290         cmd.slots[0].width = cpu_to_le16(slot0);
 291         cmd.slots[1].width = cpu_to_le16(slot1);
 292
 293         ret = iwl_send_cmd_pdu(priv, REPLY_WIPAN_PARAMS, sizeof(cmd), &cmd);
 294         if (ret)
 295                 IWL_ERR(priv, "Error setting PAN parameters (%d)\n", ret);
 296
 297         return ret;
 298 }
 299
 300 struct iwl_hcmd_ops iwlagn_hcmd = {
 301         .set_rxon_chain = iwlagn_set_rxon_chain,
 302         .set_tx_ant = iwlagn_send_tx_ant_config,
 303         .send_bt_config = iwl_send_bt_config,
 304         .set_pan_params = iwlagn_set_pan_params,
 305 };
 306
 307 struct iwl_hcmd_ops iwlagn_bt_hcmd = {
 308         .set_rxon_chain = iwlagn_set_rxon_chain,
 309         .set_tx_ant = iwlagn_send_tx_ant_config,
 310         .send_bt_config = iwlagn_send_advance_bt_config,
 311         .set_pan_params = iwlagn_set_pan_params,
 312 };
 313
 314 struct iwl_hcmd_utils_ops iwlagn_hcmd_utils = {
 315         .build_addsta_hcmd = iwlagn_build_addsta_hcmd,
 316         .gain_computation = iwlagn_gain_computation,
 317         .chain_noise_reset = iwlagn_chain_noise_reset,
 318         .tx_cmd_protection = iwlagn_tx_cmd_protection,
 319         .calc_rssi = iwlagn_calc_rssi,
 320         .request_scan = iwlagn_request_scan,
 321 };