carlfw/src/rf.c

   1 /*
   2  * carl9170 firmware - used by the ar9170 wireless device
   3  *
   4  * PHY and RF functions
   5  *
   6  * Copyright (c) 2000-2005 ZyDAS Technology Corporation
   7  * Copyright (c) 2007-2009 Atheros Communications, Inc.
   8  * Copyright    2009    Johannes Berg <johannes@sipsolutions.net>
   9  * Copyright 2009-2011  Christian Lamparter <chunkeey@googlemail.com>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License along
  22  * with this program; If not, see <http://www.gnu.org/licenses/>.
  23  */
  24
  25 #include "carl9170.h"
  26 #include "timer.h"
  27 #include "printf.h"
  28 #include "rf.h"
  29 #include "shared/phy.h"
  30
  31 #ifdef CONFIG_CARL9170FW_RADIO_FUNCTIONS
  32 static void set_channel_end(void)
  33 {
  34         /* Manipulate CCA threshold to resume transmission */
  35         set(AR9170_PHY_REG_CCA_THRESHOLD, 0x0);
  36         /* Disable Virtual CCA */
  37         andl(AR9170_MAC_REG_QOS_PRIORITY_VIRTUAL_CCA,
  38              ~AR9170_MAC_VIRTUAL_CCA_ALL);
  39
  40         fw.phy.state = CARL9170_PHY_ON;
  41 }
  42
  43 void rf_notify_set_channel(void)
  44 {
  45         /* Manipulate CCA threshold to stop transmission */
  46         set(AR9170_PHY_REG_CCA_THRESHOLD, 0x300);
  47         /* Enable Virtual CCA */
  48         orl(AR9170_MAC_REG_QOS_PRIORITY_VIRTUAL_CCA,
  49             AR9170_MAC_VIRTUAL_CCA_ALL);
  50
  51         /* reset CCA stats */
  52         fw.tally.active = 0;
  53         fw.tally.cca = 0;
  54         fw.tally.tx_time = 0;
  55         fw.phy.state = CARL9170_PHY_OFF;
  56 }
  57
  58 /*
  59  * Update delta slope coeff man and exp
  60  */
  61 static void hw_turn_off_dyn(const uint32_t delta_slope_coeff_exp,
  62                             const uint32_t delta_slope_coeff_man,
  63                             const uint32_t delta_slope_coeff_exp_shgi,
  64                             const uint32_t delta_slope_coeff_man_shgi)
  65 {
  66         uint32_t tmp;
  67
  68         tmp = get_async(AR9170_PHY_REG_TIMING3) & 0x00001fff;
  69         tmp |= (delta_slope_coeff_man << AR9170_PHY_TIMING3_DSC_MAN_S) &
  70                 AR9170_PHY_TIMING3_DSC_MAN;
  71         tmp |= (delta_slope_coeff_exp << AR9170_PHY_TIMING3_DSC_EXP_S) &
  72                 AR9170_PHY_TIMING3_DSC_EXP;
  73
  74         set(AR9170_PHY_REG_TIMING3, tmp);
  75
  76         tmp = (delta_slope_coeff_man_shgi << AR9170_PHY_HALFGI_DSC_MAN_S) &
  77                 AR9170_PHY_HALFGI_DSC_MAN;
  78
  79         tmp |= (delta_slope_coeff_exp_shgi << AR9170_PHY_HALFGI_DSC_EXP_S) &
  80                 AR9170_PHY_HALFGI_DSC_EXP;
  81
  82         set(AR9170_PHY_REG_HALFGI, tmp);
  83 }
  84
  85 static void program_ADDAC(void)
  86 {
  87         /* ??? Select Internal ADDAC ??? (is external radio) */
  88         set(AR9170_PHY_REG_ADC_SERIAL_CTL, AR9170_PHY_ADC_SCTL_SEL_EXTERNAL_RADIO);
  89
  90         delay(10);
  91
  92         set(0x1c589c, 0x00000000);      /*# 7-0 */
  93         set(0x1c589c, 0x00000000);      /*# 15-8 */
  94         set(0x1c589c, 0x00000000);      /*# 23-16 */
  95         set(0x1c589c, 0x00000000);      /*# 31- */
  96
  97         set(0x1c589c, 0x00000000);      /*# 39- */
  98         set(0x1c589c, 0x00000000);      /*# 47- */
  99         set(0x1c589c, 0x00000000);      /*# 55- [48]:doubles the xtalosc bias current */
 100         set(0x1c589c, 0x00000000);      /*# 63- */
 101
 102         set(0x1c589c, 0x00000000);      /*# 71- */
 103         set(0x1c589c, 0x00000000);      /*# 79- */
 104         set(0x1c589c, 0x00000000);      /*# 87- */
 105         set(0x1c589c, 0x00000000);      /*# 95- */
 106
 107         set(0x1c589c, 0x00000000);      /*# 103- */
 108         set(0x1c589c, 0x00000000);      /*# 111- */
 109         set(0x1c589c, 0x00000000);      /*# 119- */
 110         set(0x1c589c, 0x00000000);      /*# 127- */
 111
 112         set(0x1c589c, 0x00000000);      /*# 135- */
 113         set(0x1c589c, 0x00000000);      /*# 143- */
 114         set(0x1c589c, 0x00000000);      /*# 151- */
 115         set(0x1c589c, 0x00000030);      /*# 159- #[158:156]=xlnabufmode */
 116
 117         set(0x1c589c, 0x00000004);      /*# 167-  [162]:disable clkp_driver to flow */
 118         set(0x1c589c, 0x00000000);      /*# 175- */
 119         set(0x1c589c, 0x00000000);      /*# 183-176 */
 120         set(0x1c589c, 0x00000000);      /*# 191-184 */
 121
 122         set(0x1c589c, 0x00000000);      /*# 199- */
 123         set(0x1c589c, 0x00000000);      /*# 207- */
 124         set(0x1c589c, 0x00000000);      /*# 215- */
 125         set(0x1c589c, 0x00000000);      /*# 223- */
 126
 127         set(0x1c589c, 0x00000000);      /*# 231- */
 128         set(0x1c58c4, 0x00000000);      /*# 233-232 */
 129
 130         delay(10);
 131
 132         /* Select External Flow ???? (is internal addac??) */
 133         set(AR9170_PHY_REG_ADC_SERIAL_CTL, AR9170_PHY_ADC_SCTL_SEL_INTERNAL_ADDAC);
 134 }
 135
 136 static uint32_t AGC_calibration(uint32_t loop)
 137 {
 138         uint32_t wrdata;
 139         uint32_t ret;
 140
 141 #define AGC_CAL_NF      (AR9170_PHY_AGC_CONTROL_CAL | AR9170_PHY_AGC_CONTROL_NF)
 142
 143         wrdata = get_async(AR9170_PHY_REG_AGC_CONTROL) | AGC_CAL_NF;
 144         set(AR9170_PHY_REG_AGC_CONTROL, wrdata);
 145
 146         ret = get_async(AR9170_PHY_REG_AGC_CONTROL) & AGC_CAL_NF;
 147
 148         /* sitesurvey : 100 ms / current connected 200 ms */
 149         while ((ret != 0) && loop--) {
 150                 udelay(100);
 151
 152                 ret = get_async(AR9170_PHY_REG_AGC_CONTROL) & AGC_CAL_NF;
 153         }
 154
 155         /* return the AGC/Noise calibration state to the driver */
 156         return ret;
 157 }
 158
 159 #define EIGHTY_FLAG (CARL9170FW_PHY_HT_ENABLE | CARL9170FW_PHY_HT_DYN2040)
 160
 161 static uint32_t rf_init(const uint32_t delta_slope_coeff_exp,
 162                         const uint32_t delta_slope_coeff_man,
 163                         const uint32_t delta_slope_coeff_exp_shgi,
 164                         const uint32_t delta_slope_coeff_man_shgi,
 165                         const uint32_t finiteLoopCount,
 166                         const bool initialize)
 167 {
 168         uint32_t ret;
 169
 170         hw_turn_off_dyn(delta_slope_coeff_exp,
 171                         delta_slope_coeff_man,
 172                         delta_slope_coeff_exp_shgi,
 173                         delta_slope_coeff_man_shgi);
 174
 175         if (initialize) {
 176                 /* Real Chip */
 177                 program_ADDAC();
 178
 179                 /* inverse chain 0 <-> chain 2 */
 180                 set(AR9170_PHY_REG_ANALOG_SWAP, AR9170_PHY_ANALOG_SWAP_AB);
 181
 182                 /* swap chain 0 and chain 2 */
 183                 set(AR9170_PHY_REG_ANALOG_SWAP, AR9170_PHY_ANALOG_SWAP_AB |
 184                                                 AR9170_PHY_ANALOG_SWAP_ALT_CHAIN);
 185
 186                 /* Activate BB */
 187                 set(AR9170_PHY_REG_ACTIVE, AR9170_PHY_ACTIVE_EN);
 188                 delay(10);
 189         }
 190
 191         ret = AGC_calibration(finiteLoopCount);
 192
 193         set_channel_end();
 194         return ret;
 195 }
 196
 197 void rf_cmd(const struct carl9170_cmd *cmd, struct carl9170_rsp *resp)
 198 {
 199         uint32_t ret;
 200
 201         fw.phy.ht_settings = cmd->rf_init.ht_settings;
 202         fw.phy.frequency = cmd->rf_init.freq;
 203
 204         /*
 205          * Is the clock controlled by the PHY?
 206          */
 207 #ifdef CONFIG_CARL9170FW_80MHZ_CLOCK
 208         if ((fw.phy.ht_settings & EIGHTY_FLAG) == EIGHTY_FLAG)
 209                 clock_set(AHB_80_88MHZ, true);
 210         else
 211                 clock_set(AHB_40_44MHZ, true);
 212 #else
 213         clock_set(AHB_40_44MHZ, true);
 214 #endif
 215
 216         ret = rf_init(le32_to_cpu(cmd->rf_init.delta_slope_coeff_exp),
 217                       le32_to_cpu(cmd->rf_init.delta_slope_coeff_man),
 218                       le32_to_cpu(cmd->rf_init.delta_slope_coeff_exp_shgi),
 219                       le32_to_cpu(cmd->rf_init.delta_slope_coeff_man_shgi),
 220                       le32_to_cpu(cmd->rf_init.finiteLoopCount),
 221                       cmd->hdr.cmd == CARL9170_CMD_RF_INIT);
 222
 223         resp->hdr.len = sizeof(struct carl9170_rf_init_result);
 224         resp->rf_init_res.ret = cpu_to_le32(ret);
 225 }
 226
 227 void rf_psm(void)
 228 {
 229         u32 bank3;
 230
 231         if (fw.phy.psm.state == CARL9170_PSM_SOFTWARE) {
 232                 /* not enabled by the driver */
 233                 return;
 234         }
 235
 236         if (fw.phy.psm.state & CARL9170_PSM_SLEEP) {
 237                 fw.phy.psm.state &= ~CARL9170_PSM_SLEEP;
 238
 239                 /* disable all agc gain and offset updates to a2 */
 240                 set(AR9170_PHY_REG_TEST2, 0x8000000);
 241
 242                 /* power down ADDAC */
 243                 set(AR9170_PHY_REG_ADC_CTL,
 244                     AR9170_PHY_ADC_CTL_OFF_PWDDAC |
 245                     AR9170_PHY_ADC_CTL_OFF_PWDADC |
 246                     0xa0000000);
 247
 248                 /* Synthesizer off + RX off */
 249                 bank3 = 0x00400018;
 250
 251                 fw.phy.state = CARL9170_PHY_OFF;
 252         } else {
 253                 /* advance to the next PSM step */
 254                 fw.phy.psm.state--;
 255
 256                 if (fw.phy.psm.state == CARL9170_PSM_WAKE) {
 257                         /* wake up ADDAC */
 258                         set(AR9170_PHY_REG_ADC_CTL,
 259                             AR9170_PHY_ADC_CTL_OFF_PWDDAC |
 260                             AR9170_PHY_ADC_CTL_OFF_PWDADC);
 261
 262                         /* enable all agc gain and offset updates to a2 */
 263                         set(AR9170_PHY_REG_TEST2, 0x0);
 264
 265                         /* Synthesizer on + RX on */
 266                         bank3 = 0x01420098;
 267
 268                         fw.phy.state = CARL9170_PHY_ON;
 269                 } else {
 270                         return ;
 271                 }
 272         }
 273
 274         if (fw.phy.frequency < 3000000)
 275                 bank3 |= 0x00800000;
 276
 277         set(0x1c58f0, bank3);
 278 }
 279
 280 #endif /* CONFIG_CARL9170FW_RADIO_FUNCTIONS */