1 /****************************************************************************** 2 * 3 * This file is provided under a dual BSD/GPLv2 license. When using or 4 * redistributing this file, you may do so under either license. 5 * 6 * GPL LICENSE SUMMARY 7 * 8 * Copyright(c) 2017 Intel Deutschland GmbH 9 * Copyright(c) 2018 Intel Corporation 10 * 11 * This program is free software; you can redistribute it and/or modify 12 * it under the terms of version 2 of the GNU General Public License as 13 * published by the Free Software Foundation. 14 * 15 * This program is distributed in the hope that it will be useful, but 16 * WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 18 * General Public License for more details. 19 * 20 * BSD LICENSE 21 * 22 * Copyright(c) 2017 Intel Deutschland GmbH 23 * Copyright(c) 2018 Intel Corporation 24 * All rights reserved. 25 * 26 * Redistribution and use in source and binary forms, with or without 27 * modification, are permitted provided that the following conditions 28 * are met: 29 * 30 * * Redistributions of source code must retain the above copyright 31 * notice, this list of conditions and the following disclaimer. 32 * * Redistributions in binary form must reproduce the above copyright 33 * notice, this list of conditions and the following disclaimer in 34 * the documentation and/or other materials provided with the 35 * distribution. 36 * * Neither the name Intel Corporation nor the names of its 37 * contributors may be used to endorse or promote products derived 38 * from this software without specific prior written permission. 39 * 40 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 41 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 42 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 43 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 44 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 46 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 47 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 48 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 49 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 50 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 51 * 52 *****************************************************************************/ 53 #include "iwl-trans.h" 54 #include "iwl-prph.h" 55 #include "iwl-context-info.h" 56 #include "iwl-context-info-gen3.h" 57 #include "internal.h" 58 #include "fw/dbg.h" 59 60 /* 61 * Start up NIC's basic functionality after it has been reset 62 * (e.g. after platform boot, or shutdown via iwl_pcie_apm_stop()) 63 * NOTE: This does not load uCode nor start the embedded processor 64 */ 65 int iwl_pcie_gen2_apm_init(struct iwl_trans *trans) 66 { 67 int ret = 0; 68 69 IWL_DEBUG_INFO(trans, "Init card's basic functions\n"); 70 71 /* 72 * Use "set_bit" below rather than "write", to preserve any hardware 73 * bits already set by default after reset. 74 */ 75 76 /* 77 * Disable L0s without affecting L1; 78 * don't wait for ICH L0s (ICH bug W/A) 79 */ 80 iwl_set_bit(trans, CSR_GIO_CHICKEN_BITS, 81 CSR_GIO_CHICKEN_BITS_REG_BIT_L1A_NO_L0S_RX); 82 83 /* Set FH wait threshold to maximum (HW error during stress W/A) */ 84 iwl_set_bit(trans, CSR_DBG_HPET_MEM_REG, CSR_DBG_HPET_MEM_REG_VAL); 85 86 /* 87 * Enable HAP INTA (interrupt from management bus) to 88 * wake device's PCI Express link L1a -> L0s 89 */ 90 iwl_set_bit(trans, CSR_HW_IF_CONFIG_REG, 91 CSR_HW_IF_CONFIG_REG_BIT_HAP_WAKE_L1A); 92 93 iwl_pcie_apm_config(trans); 94 95 ret = iwl_finish_nic_init(trans); 96 if (ret) 97 return ret; 98 99 set_bit(STATUS_DEVICE_ENABLED, &trans->status); 100 101 return 0; 102 } 103 104 static void iwl_pcie_gen2_apm_stop(struct iwl_trans *trans, bool op_mode_leave) 105 { 106 IWL_DEBUG_INFO(trans, "Stop card, put in low power state\n"); 107 108 if (op_mode_leave) { 109 if (!test_bit(STATUS_DEVICE_ENABLED, &trans->status)) 110 iwl_pcie_gen2_apm_init(trans); 111 112 /* inform ME that we are leaving */ 113 iwl_set_bit(trans, CSR_DBG_LINK_PWR_MGMT_REG, 114 CSR_RESET_LINK_PWR_MGMT_DISABLED); 115 iwl_set_bit(trans, CSR_HW_IF_CONFIG_REG, 116 CSR_HW_IF_CONFIG_REG_PREPARE | 117 CSR_HW_IF_CONFIG_REG_ENABLE_PME); 118 mdelay(1); 119 iwl_clear_bit(trans, CSR_DBG_LINK_PWR_MGMT_REG, 120 CSR_RESET_LINK_PWR_MGMT_DISABLED); 121 mdelay(5); 122 } 123 124 clear_bit(STATUS_DEVICE_ENABLED, &trans->status); 125 126 /* Stop device's DMA activity */ 127 iwl_pcie_apm_stop_master(trans); 128 129 iwl_trans_sw_reset(trans); 130 131 /* 132 * Clear "initialization complete" bit to move adapter from 133 * D0A* (powered-up Active) --> D0U* (Uninitialized) state. 134 */ 135 iwl_clear_bit(trans, CSR_GP_CNTRL, 136 BIT(trans->cfg->csr->flag_init_done)); 137 } 138 139 void _iwl_trans_pcie_gen2_stop_device(struct iwl_trans *trans, bool low_power) 140 { 141 struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); 142 143 lockdep_assert_held(&trans_pcie->mutex); 144 145 if (trans_pcie->is_down) 146 return; 147 148 trans_pcie->is_down = true; 149 150 /* Stop dbgc before stopping device */ 151 _iwl_fw_dbg_stop_recording(trans, NULL); 152 153 /* tell the device to stop sending interrupts */ 154 iwl_disable_interrupts(trans); 155 156 /* device going down, Stop using ICT table */ 157 iwl_pcie_disable_ict(trans); 158 159 /* 160 * If a HW restart happens during firmware loading, 161 * then the firmware loading might call this function 162 * and later it might be called again due to the 163 * restart. So don't process again if the device is 164 * already dead. 165 */ 166 if (test_and_clear_bit(STATUS_DEVICE_ENABLED, &trans->status)) { 167 IWL_DEBUG_INFO(trans, 168 "DEVICE_ENABLED bit was set and is now cleared\n"); 169 iwl_pcie_gen2_tx_stop(trans); 170 iwl_pcie_rx_stop(trans); 171 } 172 173 iwl_pcie_ctxt_info_free_paging(trans); 174 if (trans->cfg->device_family >= IWL_DEVICE_FAMILY_22560) 175 iwl_pcie_ctxt_info_gen3_free(trans); 176 else 177 iwl_pcie_ctxt_info_free(trans); 178 179 /* Make sure (redundant) we've released our request to stay awake */ 180 iwl_clear_bit(trans, CSR_GP_CNTRL, 181 BIT(trans->cfg->csr->flag_mac_access_req)); 182 183 /* Stop the device, and put it in low power state */ 184 iwl_pcie_gen2_apm_stop(trans, false); 185 186 iwl_trans_sw_reset(trans); 187 188 /* 189 * Upon stop, the IVAR table gets erased, so msi-x won't 190 * work. This causes a bug in RF-KILL flows, since the interrupt 191 * that enables radio won't fire on the correct irq, and the 192 * driver won't be able to handle the interrupt. 193 * Configure the IVAR table again after reset. 194 */ 195 iwl_pcie_conf_msix_hw(trans_pcie); 196 197 /* 198 * Upon stop, the APM issues an interrupt if HW RF kill is set. 199 * This is a bug in certain verions of the hardware. 200 * Certain devices also keep sending HW RF kill interrupt all 201 * the time, unless the interrupt is ACKed even if the interrupt 202 * should be masked. Re-ACK all the interrupts here. 203 */ 204 iwl_disable_interrupts(trans); 205 206 /* clear all status bits */ 207 clear_bit(STATUS_SYNC_HCMD_ACTIVE, &trans->status); 208 clear_bit(STATUS_INT_ENABLED, &trans->status); 209 clear_bit(STATUS_TPOWER_PMI, &trans->status); 210 211 /* 212 * Even if we stop the HW, we still want the RF kill 213 * interrupt 214 */ 215 iwl_enable_rfkill_int(trans); 216 217 /* re-take ownership to prevent other users from stealing the device */ 218 iwl_pcie_prepare_card_hw(trans); 219 } 220 221 void iwl_trans_pcie_gen2_stop_device(struct iwl_trans *trans, bool low_power) 222 { 223 struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); 224 bool was_in_rfkill; 225 226 mutex_lock(&trans_pcie->mutex); 227 trans_pcie->opmode_down = true; 228 was_in_rfkill = test_bit(STATUS_RFKILL_OPMODE, &trans->status); 229 _iwl_trans_pcie_gen2_stop_device(trans, low_power); 230 iwl_trans_pcie_handle_stop_rfkill(trans, was_in_rfkill); 231 mutex_unlock(&trans_pcie->mutex); 232 } 233 234 static int iwl_pcie_gen2_nic_init(struct iwl_trans *trans) 235 { 236 struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); 237 int queue_size = max_t(u32, TFD_CMD_SLOTS, trans->cfg->min_txq_size); 238 239 /* TODO: most of the logic can be removed in A0 - but not in Z0 */ 240 spin_lock(&trans_pcie->irq_lock); 241 iwl_pcie_gen2_apm_init(trans); 242 spin_unlock(&trans_pcie->irq_lock); 243 244 iwl_op_mode_nic_config(trans->op_mode); 245 246 /* Allocate the RX queue, or reset if it is already allocated */ 247 if (iwl_pcie_gen2_rx_init(trans)) 248 return -ENOMEM; 249 250 /* Allocate or reset and init all Tx and Command queues */ 251 if (iwl_pcie_gen2_tx_init(trans, trans_pcie->cmd_queue, queue_size)) 252 return -ENOMEM; 253 254 /* enable shadow regs in HW */ 255 iwl_set_bit(trans, CSR_MAC_SHADOW_REG_CTRL, 0x800FFFFF); 256 IWL_DEBUG_INFO(trans, "Enabling shadow registers in device\n"); 257 258 return 0; 259 } 260 261 void iwl_trans_pcie_gen2_fw_alive(struct iwl_trans *trans, u32 scd_addr) 262 { 263 struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); 264 265 iwl_pcie_reset_ict(trans); 266 267 /* make sure all queue are not stopped/used */ 268 memset(trans_pcie->queue_stopped, 0, sizeof(trans_pcie->queue_stopped)); 269 memset(trans_pcie->queue_used, 0, sizeof(trans_pcie->queue_used)); 270 271 /* now that we got alive we can free the fw image & the context info. 272 * paging memory cannot be freed included since FW will still use it 273 */ 274 iwl_pcie_ctxt_info_free(trans); 275 } 276 277 int iwl_trans_pcie_gen2_start_fw(struct iwl_trans *trans, 278 const struct fw_img *fw, bool run_in_rfkill) 279 { 280 struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); 281 bool hw_rfkill; 282 int ret; 283 284 /* This may fail if AMT took ownership of the device */ 285 if (iwl_pcie_prepare_card_hw(trans)) { 286 IWL_WARN(trans, "Exit HW not ready\n"); 287 ret = -EIO; 288 goto out; 289 } 290 291 iwl_enable_rfkill_int(trans); 292 293 iwl_write32(trans, CSR_INT, 0xFFFFFFFF); 294 295 /* 296 * We enabled the RF-Kill interrupt and the handler may very 297 * well be running. Disable the interrupts to make sure no other 298 * interrupt can be fired. 299 */ 300 iwl_disable_interrupts(trans); 301 302 /* Make sure it finished running */ 303 iwl_pcie_synchronize_irqs(trans); 304 305 mutex_lock(&trans_pcie->mutex); 306 307 /* If platform's RF_KILL switch is NOT set to KILL */ 308 hw_rfkill = iwl_pcie_check_hw_rf_kill(trans); 309 if (hw_rfkill && !run_in_rfkill) { 310 ret = -ERFKILL; 311 goto out; 312 } 313 314 /* Someone called stop_device, don't try to start_fw */ 315 if (trans_pcie->is_down) { 316 IWL_WARN(trans, 317 "Can't start_fw since the HW hasn't been started\n"); 318 ret = -EIO; 319 goto out; 320 } 321 322 /* make sure rfkill handshake bits are cleared */ 323 iwl_write32(trans, CSR_UCODE_DRV_GP1_CLR, CSR_UCODE_SW_BIT_RFKILL); 324 iwl_write32(trans, CSR_UCODE_DRV_GP1_CLR, 325 CSR_UCODE_DRV_GP1_BIT_CMD_BLOCKED); 326 327 /* clear (again), then enable host interrupts */ 328 iwl_write32(trans, CSR_INT, 0xFFFFFFFF); 329 330 ret = iwl_pcie_gen2_nic_init(trans); 331 if (ret) { 332 IWL_ERR(trans, "Unable to init nic\n"); 333 goto out; 334 } 335 336 if (trans->cfg->device_family >= IWL_DEVICE_FAMILY_22560) 337 ret = iwl_pcie_ctxt_info_gen3_init(trans, fw); 338 else 339 ret = iwl_pcie_ctxt_info_init(trans, fw); 340 if (ret) 341 goto out; 342 343 /* re-check RF-Kill state since we may have missed the interrupt */ 344 hw_rfkill = iwl_pcie_check_hw_rf_kill(trans); 345 if (hw_rfkill && !run_in_rfkill) 346 ret = -ERFKILL; 347 348 out: 349 mutex_unlock(&trans_pcie->mutex); 350 return ret; 351 } 352