1 // SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause 2 /* 3 * Copyright (C) 2017 Intel Deutschland GmbH 4 * Copyright (C) 2018-2021 Intel Corporation 5 */ 6 #if defined(__FreeBSD__) 7 #include <linux/delay.h> 8 #endif 9 #include "iwl-trans.h" 10 #include "iwl-prph.h" 11 #include "iwl-context-info.h" 12 #include "iwl-context-info-gen3.h" 13 #include "internal.h" 14 #include "fw/dbg.h" 15 16 #define FW_RESET_TIMEOUT (HZ / 5) 17 18 /* 19 * Start up NIC's basic functionality after it has been reset 20 * (e.g. after platform boot, or shutdown via iwl_pcie_apm_stop()) 21 * NOTE: This does not load uCode nor start the embedded processor 22 */ 23 int iwl_pcie_gen2_apm_init(struct iwl_trans *trans) 24 { 25 int ret = 0; 26 27 IWL_DEBUG_INFO(trans, "Init card's basic functions\n"); 28 29 /* 30 * Use "set_bit" below rather than "write", to preserve any hardware 31 * bits already set by default after reset. 32 */ 33 34 /* 35 * Disable L0s without affecting L1; 36 * don't wait for ICH L0s (ICH bug W/A) 37 */ 38 iwl_set_bit(trans, CSR_GIO_CHICKEN_BITS, 39 CSR_GIO_CHICKEN_BITS_REG_BIT_L1A_NO_L0S_RX); 40 41 /* Set FH wait threshold to maximum (HW error during stress W/A) */ 42 iwl_set_bit(trans, CSR_DBG_HPET_MEM_REG, CSR_DBG_HPET_MEM_REG_VAL); 43 44 /* 45 * Enable HAP INTA (interrupt from management bus) to 46 * wake device's PCI Express link L1a -> L0s 47 */ 48 iwl_set_bit(trans, CSR_HW_IF_CONFIG_REG, 49 CSR_HW_IF_CONFIG_REG_BIT_HAP_WAKE_L1A); 50 51 iwl_pcie_apm_config(trans); 52 53 ret = iwl_finish_nic_init(trans); 54 if (ret) 55 return ret; 56 57 set_bit(STATUS_DEVICE_ENABLED, &trans->status); 58 59 return 0; 60 } 61 62 static void iwl_pcie_gen2_apm_stop(struct iwl_trans *trans, bool op_mode_leave) 63 { 64 IWL_DEBUG_INFO(trans, "Stop card, put in low power state\n"); 65 66 if (op_mode_leave) { 67 if (!test_bit(STATUS_DEVICE_ENABLED, &trans->status)) 68 iwl_pcie_gen2_apm_init(trans); 69 70 /* inform ME that we are leaving */ 71 iwl_set_bit(trans, CSR_DBG_LINK_PWR_MGMT_REG, 72 CSR_RESET_LINK_PWR_MGMT_DISABLED); 73 iwl_set_bit(trans, CSR_HW_IF_CONFIG_REG, 74 CSR_HW_IF_CONFIG_REG_PREPARE | 75 CSR_HW_IF_CONFIG_REG_ENABLE_PME); 76 mdelay(1); 77 iwl_clear_bit(trans, CSR_DBG_LINK_PWR_MGMT_REG, 78 CSR_RESET_LINK_PWR_MGMT_DISABLED); 79 mdelay(5); 80 } 81 82 clear_bit(STATUS_DEVICE_ENABLED, &trans->status); 83 84 /* Stop device's DMA activity */ 85 iwl_pcie_apm_stop_master(trans); 86 87 iwl_trans_sw_reset(trans); 88 89 /* 90 * Clear "initialization complete" bit to move adapter from 91 * D0A* (powered-up Active) --> D0U* (Uninitialized) state. 92 */ 93 if (trans->trans_cfg->device_family >= IWL_DEVICE_FAMILY_BZ) 94 iwl_clear_bit(trans, CSR_GP_CNTRL, 95 CSR_GP_CNTRL_REG_FLAG_MAC_INIT); 96 else 97 iwl_clear_bit(trans, CSR_GP_CNTRL, 98 CSR_GP_CNTRL_REG_FLAG_INIT_DONE); 99 } 100 101 static void iwl_trans_pcie_fw_reset_handshake(struct iwl_trans *trans) 102 { 103 struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); 104 int ret; 105 106 trans_pcie->fw_reset_state = FW_RESET_REQUESTED; 107 108 if (trans->trans_cfg->device_family < IWL_DEVICE_FAMILY_AX210) 109 iwl_write_umac_prph(trans, UREG_NIC_SET_NMI_DRIVER, 110 UREG_NIC_SET_NMI_DRIVER_RESET_HANDSHAKE); 111 else 112 iwl_write_umac_prph(trans, UREG_DOORBELL_TO_ISR6, 113 UREG_DOORBELL_TO_ISR6_RESET_HANDSHAKE); 114 115 /* wait 200ms */ 116 ret = wait_event_timeout(trans_pcie->fw_reset_waitq, 117 trans_pcie->fw_reset_state != FW_RESET_REQUESTED, 118 FW_RESET_TIMEOUT); 119 if (!ret || trans_pcie->fw_reset_state == FW_RESET_ERROR) { 120 IWL_INFO(trans, 121 "firmware didn't ACK the reset - continue anyway\n"); 122 iwl_trans_fw_error(trans, true); 123 } 124 125 trans_pcie->fw_reset_state = FW_RESET_IDLE; 126 } 127 128 void _iwl_trans_pcie_gen2_stop_device(struct iwl_trans *trans) 129 { 130 struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); 131 132 lockdep_assert_held(&trans_pcie->mutex); 133 134 if (trans_pcie->is_down) 135 return; 136 137 if (trans->state >= IWL_TRANS_FW_STARTED) 138 if (trans_pcie->fw_reset_handshake) 139 iwl_trans_pcie_fw_reset_handshake(trans); 140 141 trans_pcie->is_down = true; 142 143 /* tell the device to stop sending interrupts */ 144 iwl_disable_interrupts(trans); 145 146 /* device going down, Stop using ICT table */ 147 iwl_pcie_disable_ict(trans); 148 149 /* 150 * If a HW restart happens during firmware loading, 151 * then the firmware loading might call this function 152 * and later it might be called again due to the 153 * restart. So don't process again if the device is 154 * already dead. 155 */ 156 if (test_and_clear_bit(STATUS_DEVICE_ENABLED, &trans->status)) { 157 IWL_DEBUG_INFO(trans, 158 "DEVICE_ENABLED bit was set and is now cleared\n"); 159 iwl_txq_gen2_tx_free(trans); 160 iwl_pcie_rx_stop(trans); 161 } 162 163 iwl_pcie_ctxt_info_free_paging(trans); 164 if (trans->trans_cfg->device_family >= IWL_DEVICE_FAMILY_AX210) 165 iwl_pcie_ctxt_info_gen3_free(trans, false); 166 else 167 iwl_pcie_ctxt_info_free(trans); 168 169 /* Stop the device, and put it in low power state */ 170 iwl_pcie_gen2_apm_stop(trans, false); 171 172 iwl_trans_sw_reset(trans); 173 174 /* 175 * Upon stop, the IVAR table gets erased, so msi-x won't 176 * work. This causes a bug in RF-KILL flows, since the interrupt 177 * that enables radio won't fire on the correct irq, and the 178 * driver won't be able to handle the interrupt. 179 * Configure the IVAR table again after reset. 180 */ 181 iwl_pcie_conf_msix_hw(trans_pcie); 182 183 /* 184 * Upon stop, the APM issues an interrupt if HW RF kill is set. 185 * This is a bug in certain verions of the hardware. 186 * Certain devices also keep sending HW RF kill interrupt all 187 * the time, unless the interrupt is ACKed even if the interrupt 188 * should be masked. Re-ACK all the interrupts here. 189 */ 190 iwl_disable_interrupts(trans); 191 192 /* clear all status bits */ 193 clear_bit(STATUS_SYNC_HCMD_ACTIVE, &trans->status); 194 clear_bit(STATUS_INT_ENABLED, &trans->status); 195 clear_bit(STATUS_TPOWER_PMI, &trans->status); 196 197 /* 198 * Even if we stop the HW, we still want the RF kill 199 * interrupt 200 */ 201 iwl_enable_rfkill_int(trans); 202 203 /* re-take ownership to prevent other users from stealing the device */ 204 iwl_pcie_prepare_card_hw(trans); 205 } 206 207 void iwl_trans_pcie_gen2_stop_device(struct iwl_trans *trans) 208 { 209 struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); 210 bool was_in_rfkill; 211 212 iwl_op_mode_time_point(trans->op_mode, 213 IWL_FW_INI_TIME_POINT_HOST_DEVICE_DISABLE, 214 NULL); 215 216 mutex_lock(&trans_pcie->mutex); 217 trans_pcie->opmode_down = true; 218 was_in_rfkill = test_bit(STATUS_RFKILL_OPMODE, &trans->status); 219 _iwl_trans_pcie_gen2_stop_device(trans); 220 iwl_trans_pcie_handle_stop_rfkill(trans, was_in_rfkill); 221 mutex_unlock(&trans_pcie->mutex); 222 } 223 224 static int iwl_pcie_gen2_nic_init(struct iwl_trans *trans) 225 { 226 struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); 227 int queue_size = max_t(u32, IWL_CMD_QUEUE_SIZE, 228 trans->cfg->min_txq_size); 229 230 /* TODO: most of the logic can be removed in A0 - but not in Z0 */ 231 spin_lock_bh(&trans_pcie->irq_lock); 232 iwl_pcie_gen2_apm_init(trans); 233 spin_unlock_bh(&trans_pcie->irq_lock); 234 235 iwl_op_mode_nic_config(trans->op_mode); 236 237 /* Allocate the RX queue, or reset if it is already allocated */ 238 if (iwl_pcie_gen2_rx_init(trans)) 239 return -ENOMEM; 240 241 /* Allocate or reset and init all Tx and Command queues */ 242 if (iwl_txq_gen2_init(trans, trans->txqs.cmd.q_id, queue_size)) 243 return -ENOMEM; 244 245 /* enable shadow regs in HW */ 246 iwl_set_bit(trans, CSR_MAC_SHADOW_REG_CTRL, 0x800FFFFF); 247 IWL_DEBUG_INFO(trans, "Enabling shadow registers in device\n"); 248 249 return 0; 250 } 251 252 static void iwl_pcie_get_rf_name(struct iwl_trans *trans) 253 { 254 struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); 255 char *buf = trans_pcie->rf_name; 256 size_t buflen = sizeof(trans_pcie->rf_name); 257 size_t pos; 258 u32 version; 259 260 if (buf[0]) 261 return; 262 263 switch (CSR_HW_RFID_TYPE(trans->hw_rf_id)) { 264 case CSR_HW_RFID_TYPE(CSR_HW_RF_ID_TYPE_JF): 265 pos = scnprintf(buf, buflen, "JF"); 266 break; 267 case CSR_HW_RFID_TYPE(CSR_HW_RF_ID_TYPE_GF): 268 pos = scnprintf(buf, buflen, "GF"); 269 break; 270 case CSR_HW_RFID_TYPE(CSR_HW_RF_ID_TYPE_GF4): 271 pos = scnprintf(buf, buflen, "GF4"); 272 break; 273 case CSR_HW_RFID_TYPE(CSR_HW_RF_ID_TYPE_HR): 274 pos = scnprintf(buf, buflen, "HR"); 275 break; 276 case CSR_HW_RFID_TYPE(CSR_HW_RF_ID_TYPE_HR1): 277 pos = scnprintf(buf, buflen, "HR1"); 278 break; 279 case CSR_HW_RFID_TYPE(CSR_HW_RF_ID_TYPE_HRCDB): 280 pos = scnprintf(buf, buflen, "HRCDB"); 281 break; 282 default: 283 return; 284 } 285 286 switch (CSR_HW_RFID_TYPE(trans->hw_rf_id)) { 287 case CSR_HW_RFID_TYPE(CSR_HW_RF_ID_TYPE_HR): 288 case CSR_HW_RFID_TYPE(CSR_HW_RF_ID_TYPE_HR1): 289 case CSR_HW_RFID_TYPE(CSR_HW_RF_ID_TYPE_HRCDB): 290 version = iwl_read_prph(trans, CNVI_MBOX_C); 291 switch (version) { 292 case 0x20000: 293 pos += scnprintf(buf + pos, buflen - pos, " B3"); 294 break; 295 case 0x120000: 296 pos += scnprintf(buf + pos, buflen - pos, " B5"); 297 break; 298 default: 299 pos += scnprintf(buf + pos, buflen - pos, 300 " (0x%x)", version); 301 break; 302 } 303 break; 304 default: 305 break; 306 } 307 308 pos += scnprintf(buf + pos, buflen - pos, ", rfid=0x%x", 309 trans->hw_rf_id); 310 311 IWL_INFO(trans, "Detected RF %s\n", buf); 312 313 /* 314 * also add a \n for debugfs - need to do it after printing 315 * since our IWL_INFO machinery wants to see a static \n at 316 * the end of the string 317 */ 318 pos += scnprintf(buf + pos, buflen - pos, "\n"); 319 } 320 321 void iwl_trans_pcie_gen2_fw_alive(struct iwl_trans *trans, u32 scd_addr) 322 { 323 struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); 324 325 iwl_pcie_reset_ict(trans); 326 327 /* make sure all queue are not stopped/used */ 328 memset(trans->txqs.queue_stopped, 0, 329 sizeof(trans->txqs.queue_stopped)); 330 memset(trans->txqs.queue_used, 0, sizeof(trans->txqs.queue_used)); 331 332 /* now that we got alive we can free the fw image & the context info. 333 * paging memory cannot be freed included since FW will still use it 334 */ 335 if (trans->trans_cfg->device_family >= IWL_DEVICE_FAMILY_AX210) 336 iwl_pcie_ctxt_info_gen3_free(trans, true); 337 else 338 iwl_pcie_ctxt_info_free(trans); 339 340 /* 341 * Re-enable all the interrupts, including the RF-Kill one, now that 342 * the firmware is alive. 343 */ 344 iwl_enable_interrupts(trans); 345 mutex_lock(&trans_pcie->mutex); 346 iwl_pcie_check_hw_rf_kill(trans); 347 348 iwl_pcie_get_rf_name(trans); 349 mutex_unlock(&trans_pcie->mutex); 350 } 351 352 static void iwl_pcie_set_ltr(struct iwl_trans *trans) 353 { 354 u32 ltr_val = CSR_LTR_LONG_VAL_AD_NO_SNOOP_REQ | 355 u32_encode_bits(CSR_LTR_LONG_VAL_AD_SCALE_USEC, 356 CSR_LTR_LONG_VAL_AD_NO_SNOOP_SCALE) | 357 u32_encode_bits(250, 358 CSR_LTR_LONG_VAL_AD_NO_SNOOP_VAL) | 359 CSR_LTR_LONG_VAL_AD_SNOOP_REQ | 360 u32_encode_bits(CSR_LTR_LONG_VAL_AD_SCALE_USEC, 361 CSR_LTR_LONG_VAL_AD_SNOOP_SCALE) | 362 u32_encode_bits(250, CSR_LTR_LONG_VAL_AD_SNOOP_VAL); 363 364 /* 365 * To workaround hardware latency issues during the boot process, 366 * initialize the LTR to ~250 usec (see ltr_val above). 367 * The firmware initializes this again later (to a smaller value). 368 */ 369 if ((trans->trans_cfg->device_family == IWL_DEVICE_FAMILY_AX210 || 370 trans->trans_cfg->device_family == IWL_DEVICE_FAMILY_22000) && 371 !trans->trans_cfg->integrated) { 372 iwl_write32(trans, CSR_LTR_LONG_VAL_AD, ltr_val); 373 } else if (trans->trans_cfg->integrated && 374 trans->trans_cfg->device_family == IWL_DEVICE_FAMILY_22000) { 375 iwl_write_prph(trans, HPM_MAC_LTR_CSR, HPM_MAC_LRT_ENABLE_ALL); 376 iwl_write_prph(trans, HPM_UMAC_LTR, ltr_val); 377 } 378 } 379 380 int iwl_trans_pcie_gen2_start_fw(struct iwl_trans *trans, 381 const struct fw_img *fw, bool run_in_rfkill) 382 { 383 struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); 384 bool hw_rfkill; 385 int ret; 386 387 /* This may fail if AMT took ownership of the device */ 388 if (iwl_pcie_prepare_card_hw(trans)) { 389 IWL_WARN(trans, "Exit HW not ready\n"); 390 ret = -EIO; 391 goto out; 392 } 393 394 iwl_enable_rfkill_int(trans); 395 396 iwl_write32(trans, CSR_INT, 0xFFFFFFFF); 397 398 /* 399 * We enabled the RF-Kill interrupt and the handler may very 400 * well be running. Disable the interrupts to make sure no other 401 * interrupt can be fired. 402 */ 403 iwl_disable_interrupts(trans); 404 405 /* Make sure it finished running */ 406 iwl_pcie_synchronize_irqs(trans); 407 408 mutex_lock(&trans_pcie->mutex); 409 410 /* If platform's RF_KILL switch is NOT set to KILL */ 411 hw_rfkill = iwl_pcie_check_hw_rf_kill(trans); 412 if (hw_rfkill && !run_in_rfkill) { 413 ret = -ERFKILL; 414 goto out; 415 } 416 417 /* Someone called stop_device, don't try to start_fw */ 418 if (trans_pcie->is_down) { 419 IWL_WARN(trans, 420 "Can't start_fw since the HW hasn't been started\n"); 421 ret = -EIO; 422 goto out; 423 } 424 425 /* make sure rfkill handshake bits are cleared */ 426 iwl_write32(trans, CSR_UCODE_DRV_GP1_CLR, CSR_UCODE_SW_BIT_RFKILL); 427 iwl_write32(trans, CSR_UCODE_DRV_GP1_CLR, 428 CSR_UCODE_DRV_GP1_BIT_CMD_BLOCKED); 429 430 /* clear (again), then enable host interrupts */ 431 iwl_write32(trans, CSR_INT, 0xFFFFFFFF); 432 433 ret = iwl_pcie_gen2_nic_init(trans); 434 if (ret) { 435 IWL_ERR(trans, "Unable to init nic\n"); 436 goto out; 437 } 438 439 if (trans->trans_cfg->device_family >= IWL_DEVICE_FAMILY_AX210) 440 ret = iwl_pcie_ctxt_info_gen3_init(trans, fw); 441 else 442 ret = iwl_pcie_ctxt_info_init(trans, fw); 443 if (ret) 444 goto out; 445 446 iwl_pcie_set_ltr(trans); 447 448 if (trans->trans_cfg->device_family >= IWL_DEVICE_FAMILY_BZ) { 449 iwl_write32(trans, CSR_FUNC_SCRATCH, CSR_FUNC_SCRATCH_INIT_VALUE); 450 iwl_set_bit(trans, CSR_GP_CNTRL, 451 CSR_GP_CNTRL_REG_FLAG_ROM_START); 452 } else if (trans->trans_cfg->device_family >= IWL_DEVICE_FAMILY_AX210) { 453 iwl_write_umac_prph(trans, UREG_CPU_INIT_RUN, 1); 454 } else { 455 iwl_write_prph(trans, UREG_CPU_INIT_RUN, 1); 456 } 457 458 /* re-check RF-Kill state since we may have missed the interrupt */ 459 hw_rfkill = iwl_pcie_check_hw_rf_kill(trans); 460 if (hw_rfkill && !run_in_rfkill) 461 ret = -ERFKILL; 462 463 out: 464 mutex_unlock(&trans_pcie->mutex); 465 return ret; 466 } 467