1 /* 2 * Copyright (c) 2010-2011 Atheros Communications Inc. 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 11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 15 */ 16 17 #include "hw.h" 18 #include "hw-ops.h" 19 #include "ar9003_phy.h" 20 #include "ar9003_rtt.h" 21 22 #define RTT_RESTORE_TIMEOUT 1000 23 #define RTT_ACCESS_TIMEOUT 100 24 #define RTT_BAD_VALUE 0x0bad0bad 25 26 /* 27 * RTT (Radio Retention Table) hardware implementation information 28 * 29 * There is an internal table (i.e. the rtt) for each chain (or bank). 30 * Each table contains 6 entries and each entry is corresponding to 31 * a specific calibration parameter as depicted below. 32 * 0~2 - DC offset DAC calibration: loop, low, high (offsetI/Q_...) 33 * 3 - Filter cal (filterfc) 34 * 4 - RX gain settings 35 * 5 - Peak detector offset calibration (agc_caldac) 36 */ 37 38 void ar9003_hw_rtt_enable(struct ath_hw *ah) 39 { 40 REG_WRITE(ah, AR_PHY_RTT_CTRL, 1); 41 } 42 43 void ar9003_hw_rtt_disable(struct ath_hw *ah) 44 { 45 REG_WRITE(ah, AR_PHY_RTT_CTRL, 0); 46 } 47 48 void ar9003_hw_rtt_set_mask(struct ath_hw *ah, u32 rtt_mask) 49 { 50 REG_RMW_FIELD(ah, AR_PHY_RTT_CTRL, 51 AR_PHY_RTT_CTRL_RESTORE_MASK, rtt_mask); 52 } 53 54 bool ar9003_hw_rtt_force_restore(struct ath_hw *ah) 55 { 56 if (!ath9k_hw_wait(ah, AR_PHY_RTT_CTRL, 57 AR_PHY_RTT_CTRL_FORCE_RADIO_RESTORE, 58 0, RTT_RESTORE_TIMEOUT)) 59 return false; 60 61 REG_RMW_FIELD(ah, AR_PHY_RTT_CTRL, 62 AR_PHY_RTT_CTRL_FORCE_RADIO_RESTORE, 1); 63 64 if (!ath9k_hw_wait(ah, AR_PHY_RTT_CTRL, 65 AR_PHY_RTT_CTRL_FORCE_RADIO_RESTORE, 66 0, RTT_RESTORE_TIMEOUT)) 67 return false; 68 69 return true; 70 } 71 72 static void ar9003_hw_rtt_load_hist_entry(struct ath_hw *ah, u8 chain, 73 u32 index, u32 data28) 74 { 75 u32 val; 76 77 val = SM(data28, AR_PHY_RTT_SW_RTT_TABLE_DATA); 78 REG_WRITE(ah, AR_PHY_RTT_TABLE_SW_INTF_1_B(chain), val); 79 80 val = SM(0, AR_PHY_RTT_SW_RTT_TABLE_ACCESS) | 81 SM(1, AR_PHY_RTT_SW_RTT_TABLE_WRITE) | 82 SM(index, AR_PHY_RTT_SW_RTT_TABLE_ADDR); 83 REG_WRITE(ah, AR_PHY_RTT_TABLE_SW_INTF_B(chain), val); 84 udelay(1); 85 86 val |= SM(1, AR_PHY_RTT_SW_RTT_TABLE_ACCESS); 87 REG_WRITE(ah, AR_PHY_RTT_TABLE_SW_INTF_B(chain), val); 88 udelay(1); 89 90 if (!ath9k_hw_wait(ah, AR_PHY_RTT_TABLE_SW_INTF_B(chain), 91 AR_PHY_RTT_SW_RTT_TABLE_ACCESS, 0, 92 RTT_ACCESS_TIMEOUT)) 93 return; 94 95 val &= ~SM(1, AR_PHY_RTT_SW_RTT_TABLE_WRITE); 96 REG_WRITE(ah, AR_PHY_RTT_TABLE_SW_INTF_B(chain), val); 97 udelay(1); 98 99 ath9k_hw_wait(ah, AR_PHY_RTT_TABLE_SW_INTF_B(chain), 100 AR_PHY_RTT_SW_RTT_TABLE_ACCESS, 0, 101 RTT_ACCESS_TIMEOUT); 102 } 103 104 void ar9003_hw_rtt_load_hist(struct ath_hw *ah) 105 { 106 int chain, i; 107 108 for (chain = 0; chain < AR9300_MAX_CHAINS; chain++) { 109 if (!(ah->rxchainmask & (1 << chain))) 110 continue; 111 for (i = 0; i < MAX_RTT_TABLE_ENTRY; i++) { 112 ar9003_hw_rtt_load_hist_entry(ah, chain, i, 113 ah->caldata->rtt_table[chain][i]); 114 ath_dbg(ath9k_hw_common(ah), CALIBRATE, 115 "Load RTT value at idx %d, chain %d: 0x%x\n", 116 i, chain, ah->caldata->rtt_table[chain][i]); 117 } 118 } 119 } 120 121 static int ar9003_hw_rtt_fill_hist_entry(struct ath_hw *ah, u8 chain, u32 index) 122 { 123 u32 val; 124 125 val = SM(0, AR_PHY_RTT_SW_RTT_TABLE_ACCESS) | 126 SM(0, AR_PHY_RTT_SW_RTT_TABLE_WRITE) | 127 SM(index, AR_PHY_RTT_SW_RTT_TABLE_ADDR); 128 129 REG_WRITE(ah, AR_PHY_RTT_TABLE_SW_INTF_B(chain), val); 130 udelay(1); 131 132 val |= SM(1, AR_PHY_RTT_SW_RTT_TABLE_ACCESS); 133 REG_WRITE(ah, AR_PHY_RTT_TABLE_SW_INTF_B(chain), val); 134 udelay(1); 135 136 if (!ath9k_hw_wait(ah, AR_PHY_RTT_TABLE_SW_INTF_B(chain), 137 AR_PHY_RTT_SW_RTT_TABLE_ACCESS, 0, 138 RTT_ACCESS_TIMEOUT)) 139 return RTT_BAD_VALUE; 140 141 val = MS(REG_READ(ah, AR_PHY_RTT_TABLE_SW_INTF_1_B(chain)), 142 AR_PHY_RTT_SW_RTT_TABLE_DATA); 143 144 145 return val; 146 } 147 148 void ar9003_hw_rtt_fill_hist(struct ath_hw *ah) 149 { 150 int chain, i; 151 152 for (chain = 0; chain < AR9300_MAX_CHAINS; chain++) { 153 if (!(ah->rxchainmask & (1 << chain))) 154 continue; 155 for (i = 0; i < MAX_RTT_TABLE_ENTRY; i++) { 156 ah->caldata->rtt_table[chain][i] = 157 ar9003_hw_rtt_fill_hist_entry(ah, chain, i); 158 ath_dbg(ath9k_hw_common(ah), CALIBRATE, 159 "RTT value at idx %d, chain %d is: 0x%x\n", 160 i, chain, ah->caldata->rtt_table[chain][i]); 161 } 162 } 163 164 ah->caldata->rtt_done = true; 165 } 166 167 void ar9003_hw_rtt_clear_hist(struct ath_hw *ah) 168 { 169 int chain, i; 170 171 for (chain = 0; chain < AR9300_MAX_CHAINS; chain++) { 172 if (!(ah->rxchainmask & (1 << chain))) 173 continue; 174 for (i = 0; i < MAX_RTT_TABLE_ENTRY; i++) 175 ar9003_hw_rtt_load_hist_entry(ah, chain, i, 0); 176 } 177 178 if (ah->caldata) 179 ah->caldata->rtt_done = false; 180 } 181 182 bool ar9003_hw_rtt_restore(struct ath_hw *ah, struct ath9k_channel *chan) 183 { 184 bool restore; 185 186 if (!ah->caldata) 187 return false; 188 189 if (!ah->caldata->rtt_done) 190 return false; 191 192 ar9003_hw_rtt_enable(ah); 193 ar9003_hw_rtt_set_mask(ah, 0x10); 194 195 if (!ath9k_hw_rfbus_req(ah)) { 196 ath_err(ath9k_hw_common(ah), "Could not stop baseband\n"); 197 restore = false; 198 goto fail; 199 } 200 201 ar9003_hw_rtt_load_hist(ah); 202 restore = ar9003_hw_rtt_force_restore(ah); 203 204 fail: 205 ath9k_hw_rfbus_done(ah); 206 ar9003_hw_rtt_disable(ah); 207 return restore; 208 } 209