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 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of version 2 of the GNU General Public License as 12 * published by the Free Software Foundation. 13 * 14 * This program is distributed in the hope that it will be useful, but 15 * WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 17 * General Public License for more details. 18 * 19 * BSD LICENSE 20 * 21 * Copyright(c) 2017 Intel Deutschland GmbH 22 * All rights reserved. 23 * 24 * Redistribution and use in source and binary forms, with or without 25 * modification, are permitted provided that the following conditions 26 * are met: 27 * 28 * * Redistributions of source code must retain the above copyright 29 * notice, this list of conditions and the following disclaimer. 30 * * Redistributions in binary form must reproduce the above copyright 31 * notice, this list of conditions and the following disclaimer in 32 * the documentation and/or other materials provided with the 33 * distribution. 34 * * Neither the name Intel Corporation nor the names of its 35 * contributors may be used to endorse or promote products derived 36 * from this software without specific prior written permission. 37 * 38 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 39 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 40 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 41 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 42 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 43 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 44 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 45 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 46 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 47 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 48 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 49 * 50 *****************************************************************************/ 51 #include "iwl-trans.h" 52 #include "iwl-context-info.h" 53 #include "internal.h" 54 55 /* 56 * Start up NIC's basic functionality after it has been reset 57 * (e.g. after platform boot, or shutdown via iwl_pcie_apm_stop()) 58 * NOTE: This does not load uCode nor start the embedded processor 59 */ 60 static int iwl_pcie_gen2_apm_init(struct iwl_trans *trans) 61 { 62 int ret = 0; 63 64 IWL_DEBUG_INFO(trans, "Init card's basic functions\n"); 65 66 /* 67 * Use "set_bit" below rather than "write", to preserve any hardware 68 * bits already set by default after reset. 69 */ 70 71 /* 72 * Disable L0s without affecting L1; 73 * don't wait for ICH L0s (ICH bug W/A) 74 */ 75 iwl_set_bit(trans, CSR_GIO_CHICKEN_BITS, 76 CSR_GIO_CHICKEN_BITS_REG_BIT_L1A_NO_L0S_RX); 77 78 /* Set FH wait threshold to maximum (HW error during stress W/A) */ 79 iwl_set_bit(trans, CSR_DBG_HPET_MEM_REG, CSR_DBG_HPET_MEM_REG_VAL); 80 81 /* 82 * Enable HAP INTA (interrupt from management bus) to 83 * wake device's PCI Express link L1a -> L0s 84 */ 85 iwl_set_bit(trans, CSR_HW_IF_CONFIG_REG, 86 CSR_HW_IF_CONFIG_REG_BIT_HAP_WAKE_L1A); 87 88 iwl_pcie_apm_config(trans); 89 90 /* 91 * Set "initialization complete" bit to move adapter from 92 * D0U* --> D0A* (powered-up active) state. 93 */ 94 iwl_set_bit(trans, CSR_GP_CNTRL, CSR_GP_CNTRL_REG_FLAG_INIT_DONE); 95 96 /* 97 * Wait for clock stabilization; once stabilized, access to 98 * device-internal resources is supported, e.g. iwl_write_prph() 99 * and accesses to uCode SRAM. 100 */ 101 ret = iwl_poll_bit(trans, CSR_GP_CNTRL, 102 CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY, 103 CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY, 25000); 104 if (ret < 0) { 105 IWL_DEBUG_INFO(trans, "Failed to init the card\n"); 106 return ret; 107 } 108 109 set_bit(STATUS_DEVICE_ENABLED, &trans->status); 110 111 return 0; 112 } 113 114 static void iwl_pcie_gen2_apm_stop(struct iwl_trans *trans, bool op_mode_leave) 115 { 116 IWL_DEBUG_INFO(trans, "Stop card, put in low power state\n"); 117 118 if (op_mode_leave) { 119 if (!test_bit(STATUS_DEVICE_ENABLED, &trans->status)) 120 iwl_pcie_gen2_apm_init(trans); 121 122 /* inform ME that we are leaving */ 123 iwl_set_bit(trans, CSR_DBG_LINK_PWR_MGMT_REG, 124 CSR_RESET_LINK_PWR_MGMT_DISABLED); 125 iwl_set_bit(trans, CSR_HW_IF_CONFIG_REG, 126 CSR_HW_IF_CONFIG_REG_PREPARE | 127 CSR_HW_IF_CONFIG_REG_ENABLE_PME); 128 mdelay(1); 129 iwl_clear_bit(trans, CSR_DBG_LINK_PWR_MGMT_REG, 130 CSR_RESET_LINK_PWR_MGMT_DISABLED); 131 mdelay(5); 132 } 133 134 clear_bit(STATUS_DEVICE_ENABLED, &trans->status); 135 136 /* Stop device's DMA activity */ 137 iwl_pcie_apm_stop_master(trans); 138 139 /* Reset the entire device */ 140 iwl_set_bit(trans, CSR_RESET, CSR_RESET_REG_FLAG_SW_RESET); 141 usleep_range(1000, 2000); 142 143 /* 144 * Clear "initialization complete" bit to move adapter from 145 * D0A* (powered-up Active) --> D0U* (Uninitialized) state. 146 */ 147 iwl_clear_bit(trans, CSR_GP_CNTRL, CSR_GP_CNTRL_REG_FLAG_INIT_DONE); 148 } 149 150 void _iwl_trans_pcie_gen2_stop_device(struct iwl_trans *trans, bool low_power) 151 { 152 struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); 153 bool hw_rfkill, was_hw_rfkill; 154 155 lockdep_assert_held(&trans_pcie->mutex); 156 157 if (trans_pcie->is_down) 158 return; 159 160 trans_pcie->is_down = true; 161 162 was_hw_rfkill = iwl_is_rfkill_set(trans); 163 164 /* tell the device to stop sending interrupts */ 165 iwl_disable_interrupts(trans); 166 167 /* device going down, Stop using ICT table */ 168 iwl_pcie_disable_ict(trans); 169 170 /* 171 * If a HW restart happens during firmware loading, 172 * then the firmware loading might call this function 173 * and later it might be called again due to the 174 * restart. So don't process again if the device is 175 * already dead. 176 */ 177 if (test_and_clear_bit(STATUS_DEVICE_ENABLED, &trans->status)) { 178 IWL_DEBUG_INFO(trans, 179 "DEVICE_ENABLED bit was set and is now cleared\n"); 180 iwl_pcie_gen2_tx_stop(trans); 181 iwl_pcie_rx_stop(trans); 182 } 183 184 iwl_pcie_ctxt_info_free_paging(trans); 185 iwl_pcie_ctxt_info_free(trans); 186 187 /* Make sure (redundant) we've released our request to stay awake */ 188 iwl_clear_bit(trans, CSR_GP_CNTRL, 189 CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ); 190 191 /* Stop the device, and put it in low power state */ 192 iwl_pcie_gen2_apm_stop(trans, false); 193 194 /* stop and reset the on-board processor */ 195 iwl_write32(trans, CSR_RESET, CSR_RESET_REG_FLAG_SW_RESET); 196 usleep_range(1000, 2000); 197 198 /* 199 * Upon stop, the IVAR table gets erased, so msi-x won't 200 * work. This causes a bug in RF-KILL flows, since the interrupt 201 * that enables radio won't fire on the correct irq, and the 202 * driver won't be able to handle the interrupt. 203 * Configure the IVAR table again after reset. 204 */ 205 iwl_pcie_conf_msix_hw(trans_pcie); 206 207 /* 208 * Upon stop, the APM issues an interrupt if HW RF kill is set. 209 * This is a bug in certain verions of the hardware. 210 * Certain devices also keep sending HW RF kill interrupt all 211 * the time, unless the interrupt is ACKed even if the interrupt 212 * should be masked. Re-ACK all the interrupts here. 213 */ 214 iwl_disable_interrupts(trans); 215 216 /* clear all status bits */ 217 clear_bit(STATUS_SYNC_HCMD_ACTIVE, &trans->status); 218 clear_bit(STATUS_INT_ENABLED, &trans->status); 219 clear_bit(STATUS_TPOWER_PMI, &trans->status); 220 clear_bit(STATUS_RFKILL, &trans->status); 221 222 /* 223 * Even if we stop the HW, we still want the RF kill 224 * interrupt 225 */ 226 iwl_enable_rfkill_int(trans); 227 228 /* 229 * Check again since the RF kill state may have changed while 230 * all the interrupts were disabled, in this case we couldn't 231 * receive the RF kill interrupt and update the state in the 232 * op_mode. 233 * Don't call the op_mode if the rkfill state hasn't changed. 234 * This allows the op_mode to call stop_device from the rfkill 235 * notification without endless recursion. Under very rare 236 * circumstances, we might have a small recursion if the rfkill 237 * state changed exactly now while we were called from stop_device. 238 * This is very unlikely but can happen and is supported. 239 */ 240 hw_rfkill = iwl_is_rfkill_set(trans); 241 if (hw_rfkill) 242 set_bit(STATUS_RFKILL, &trans->status); 243 else 244 clear_bit(STATUS_RFKILL, &trans->status); 245 if (hw_rfkill != was_hw_rfkill) 246 iwl_trans_pcie_rf_kill(trans, hw_rfkill); 247 248 /* re-take ownership to prevent other users from stealing the device */ 249 iwl_pcie_prepare_card_hw(trans); 250 } 251 252 void iwl_trans_pcie_gen2_stop_device(struct iwl_trans *trans, bool low_power) 253 { 254 struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); 255 256 mutex_lock(&trans_pcie->mutex); 257 _iwl_trans_pcie_gen2_stop_device(trans, low_power); 258 mutex_unlock(&trans_pcie->mutex); 259 } 260 261 static int iwl_pcie_gen2_nic_init(struct iwl_trans *trans) 262 { 263 struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); 264 265 /* TODO: most of the logic can be removed in A0 - but not in Z0 */ 266 spin_lock(&trans_pcie->irq_lock); 267 iwl_pcie_gen2_apm_init(trans); 268 spin_unlock(&trans_pcie->irq_lock); 269 270 iwl_op_mode_nic_config(trans->op_mode); 271 272 /* Allocate the RX queue, or reset if it is already allocated */ 273 if (iwl_pcie_gen2_rx_init(trans)) 274 return -ENOMEM; 275 276 /* Allocate or reset and init all Tx and Command queues */ 277 if (iwl_pcie_gen2_tx_init(trans)) 278 return -ENOMEM; 279 280 /* enable shadow regs in HW */ 281 iwl_set_bit(trans, CSR_MAC_SHADOW_REG_CTRL, 0x800FFFFF); 282 IWL_DEBUG_INFO(trans, "Enabling shadow registers in device\n"); 283 284 return 0; 285 } 286 287 void iwl_trans_pcie_gen2_fw_alive(struct iwl_trans *trans, u32 scd_addr) 288 { 289 struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); 290 291 iwl_pcie_reset_ict(trans); 292 293 /* make sure all queue are not stopped/used */ 294 memset(trans_pcie->queue_stopped, 0, sizeof(trans_pcie->queue_stopped)); 295 memset(trans_pcie->queue_used, 0, sizeof(trans_pcie->queue_used)); 296 297 /* now that we got alive we can free the fw image & the context info. 298 * paging memory cannot be freed included since FW will still use it 299 */ 300 iwl_pcie_ctxt_info_free(trans); 301 } 302 303 int iwl_trans_pcie_gen2_start_fw(struct iwl_trans *trans, 304 const struct fw_img *fw, bool run_in_rfkill) 305 { 306 struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); 307 bool hw_rfkill; 308 int ret; 309 310 /* This may fail if AMT took ownership of the device */ 311 if (iwl_pcie_prepare_card_hw(trans)) { 312 IWL_WARN(trans, "Exit HW not ready\n"); 313 ret = -EIO; 314 goto out; 315 } 316 317 iwl_enable_rfkill_int(trans); 318 319 iwl_write32(trans, CSR_INT, 0xFFFFFFFF); 320 321 /* 322 * We enabled the RF-Kill interrupt and the handler may very 323 * well be running. Disable the interrupts to make sure no other 324 * interrupt can be fired. 325 */ 326 iwl_disable_interrupts(trans); 327 328 /* Make sure it finished running */ 329 iwl_pcie_synchronize_irqs(trans); 330 331 mutex_lock(&trans_pcie->mutex); 332 333 /* If platform's RF_KILL switch is NOT set to KILL */ 334 hw_rfkill = iwl_trans_check_hw_rf_kill(trans); 335 if (hw_rfkill && !run_in_rfkill) { 336 ret = -ERFKILL; 337 goto out; 338 } 339 340 /* Someone called stop_device, don't try to start_fw */ 341 if (trans_pcie->is_down) { 342 IWL_WARN(trans, 343 "Can't start_fw since the HW hasn't been started\n"); 344 ret = -EIO; 345 goto out; 346 } 347 348 /* make sure rfkill handshake bits are cleared */ 349 iwl_write32(trans, CSR_UCODE_DRV_GP1_CLR, CSR_UCODE_SW_BIT_RFKILL); 350 iwl_write32(trans, CSR_UCODE_DRV_GP1_CLR, 351 CSR_UCODE_DRV_GP1_BIT_CMD_BLOCKED); 352 353 /* clear (again), then enable host interrupts */ 354 iwl_write32(trans, CSR_INT, 0xFFFFFFFF); 355 356 ret = iwl_pcie_gen2_nic_init(trans); 357 if (ret) { 358 IWL_ERR(trans, "Unable to init nic\n"); 359 goto out; 360 } 361 362 ret = iwl_pcie_ctxt_info_init(trans, fw); 363 if (ret) 364 goto out; 365 366 /* re-check RF-Kill state since we may have missed the interrupt */ 367 hw_rfkill = iwl_trans_check_hw_rf_kill(trans); 368 if (hw_rfkill && !run_in_rfkill) 369 ret = -ERFKILL; 370 371 out: 372 mutex_unlock(&trans_pcie->mutex); 373 return ret; 374 } 375