drivers/net/wireless/ath/wil6210/pcie_bus.c

   1 /*
   2  * Copyright (c) 2012-2016 Qualcomm Atheros, 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 <linux/module.h>
  18 #include <linux/pci.h>
  19 #include <linux/moduleparam.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/suspend.h>
  22 #include "wil6210.h"
  23 #include <linux/rtnetlink.h>
  24
  25 static bool use_msi = true;
  26 module_param(use_msi, bool, S_IRUGO);
  27 MODULE_PARM_DESC(use_msi, " Use MSI interrupt, default - true");
  28
  29 #ifdef CONFIG_PM
  30 #ifdef CONFIG_PM_SLEEP
  31 static int wil6210_pm_notify(struct notifier_block *notify_block,
  32                              unsigned long mode, void *unused);
  33 #endif /* CONFIG_PM_SLEEP */
  34 #endif /* CONFIG_PM */
  35
  36 static
  37 void wil_set_capabilities(struct wil6210_priv *wil)
  38 {
  39         u32 rev_id = wil_r(wil, RGF_USER_JTAG_DEV_ID);
  40
  41         bitmap_zero(wil->hw_capabilities, hw_capability_last);
  42         bitmap_zero(wil->fw_capabilities, WMI_FW_CAPABILITY_MAX);
  43
  44         switch (rev_id) {
  45         case JTAG_DEV_ID_SPARROW_B0:
  46                 wil->hw_name = "Sparrow B0";
  47                 wil->hw_version = HW_VER_SPARROW_B0;
  48                 break;
  49         default:
  50                 wil_err(wil, "Unknown board hardware 0x%08x\n", rev_id);
  51                 wil->hw_name = "Unknown";
  52                 wil->hw_version = HW_VER_UNKNOWN;
  53         }
  54
  55         wil_info(wil, "Board hardware is %s\n", wil->hw_name);
  56
  57         /* extract FW capabilities from file without loading the FW */
  58         wil_request_firmware(wil, WIL_FW_NAME, false);
  59 }
  60
  61 void wil_disable_irq(struct wil6210_priv *wil)
  62 {
  63         disable_irq(wil->pdev->irq);
  64 }
  65
  66 void wil_enable_irq(struct wil6210_priv *wil)
  67 {
  68         enable_irq(wil->pdev->irq);
  69 }
  70
  71 /* Bus ops */
  72 static int wil_if_pcie_enable(struct wil6210_priv *wil)
  73 {
  74         struct pci_dev *pdev = wil->pdev;
  75         int rc;
  76         /* on platforms with buggy ACPI, pdev->msi_enabled may be set to
  77          * allow pci_enable_device to work. This indicates INTx was not routed
  78          * and only MSI should be used
  79          */
  80         int msi_only = pdev->msi_enabled;
  81         bool _use_msi = use_msi;
  82
  83         wil_dbg_misc(wil, "%s()\n", __func__);
  84
  85         pdev->msi_enabled = 0;
  86
  87         pci_set_master(pdev);
  88
  89         wil_dbg_misc(wil, "Setup %s interrupt\n", use_msi ? "MSI" : "INTx");
  90
  91         if (use_msi && pci_enable_msi(pdev)) {
  92                 wil_err(wil, "pci_enable_msi failed, use INTx\n");
  93                 _use_msi = false;
  94         }
  95
  96         if (!_use_msi && msi_only) {
  97                 wil_err(wil, "Interrupt pin not routed, unable to use INTx\n");
  98                 rc = -ENODEV;
  99                 goto stop_master;
 100         }
 101
 102         rc = wil6210_init_irq(wil, pdev->irq, _use_msi);
 103         if (rc)
 104                 goto stop_master;
 105
 106         /* need reset here to obtain MAC */
 107         mutex_lock(&wil->mutex);
 108         rc = wil_reset(wil, false);
 109         mutex_unlock(&wil->mutex);
 110         if (rc)
 111                 goto release_irq;
 112
 113         return 0;
 114
 115  release_irq:
 116         wil6210_fini_irq(wil, pdev->irq);
 117         /* safe to call if no MSI */
 118         pci_disable_msi(pdev);
 119  stop_master:
 120         pci_clear_master(pdev);
 121         return rc;
 122 }
 123
 124 static int wil_if_pcie_disable(struct wil6210_priv *wil)
 125 {
 126         struct pci_dev *pdev = wil->pdev;
 127
 128         wil_dbg_misc(wil, "%s()\n", __func__);
 129
 130         pci_clear_master(pdev);
 131         /* disable and release IRQ */
 132         wil6210_fini_irq(wil, pdev->irq);
 133         /* safe to call if no MSI */
 134         pci_disable_msi(pdev);
 135         /* TODO: disable HW */
 136
 137         return 0;
 138 }
 139
 140 static int wil_platform_rop_ramdump(void *wil_handle, void *buf, uint32_t size)
 141 {
 142         struct wil6210_priv *wil = wil_handle;
 143
 144         if (!wil)
 145                 return -EINVAL;
 146
 147         return wil_fw_copy_crash_dump(wil, buf, size);
 148 }
 149
 150 static int wil_platform_rop_fw_recovery(void *wil_handle)
 151 {
 152         struct wil6210_priv *wil = wil_handle;
 153
 154         if (!wil)
 155                 return -EINVAL;
 156
 157         wil_fw_error_recovery(wil);
 158
 159         return 0;
 160 }
 161
 162 static int wil_pcie_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 163 {
 164         struct wil6210_priv *wil;
 165         struct device *dev = &pdev->dev;
 166         int rc;
 167         const struct wil_platform_rops rops = {
 168                 .ramdump = wil_platform_rop_ramdump,
 169                 .fw_recovery = wil_platform_rop_fw_recovery,
 170         };
 171
 172         /* check HW */
 173         dev_info(&pdev->dev, WIL_NAME
 174                  " device found [%04x:%04x] (rev %x)\n",
 175                  (int)pdev->vendor, (int)pdev->device, (int)pdev->revision);
 176
 177         if (pci_resource_len(pdev, 0) != WIL6210_MEM_SIZE) {
 178                 dev_err(&pdev->dev, "Not " WIL_NAME "? "
 179                         "BAR0 size is %lu while expecting %lu\n",
 180                         (ulong)pci_resource_len(pdev, 0), WIL6210_MEM_SIZE);
 181                 return -ENODEV;
 182         }
 183
 184         wil = wil_if_alloc(dev);
 185         if (IS_ERR(wil)) {
 186                 rc = (int)PTR_ERR(wil);
 187                 dev_err(dev, "wil_if_alloc failed: %d\n", rc);
 188                 return rc;
 189         }
 190         wil->pdev = pdev;
 191         pci_set_drvdata(pdev, wil);
 192         /* rollback to if_free */
 193
 194         wil->platform_handle =
 195                 wil_platform_init(&pdev->dev, &wil->platform_ops, &rops, wil);
 196         if (!wil->platform_handle) {
 197                 rc = -ENODEV;
 198                 wil_err(wil, "wil_platform_init failed\n");
 199                 goto if_free;
 200         }
 201         /* rollback to err_plat */
 202
 203         rc = pci_enable_device(pdev);
 204         if (rc) {
 205                 wil_err(wil,
 206                         "pci_enable_device failed, retry with MSI only\n");
 207                 /* Work around for platforms that can't allocate IRQ:
 208                  * retry with MSI only
 209                  */
 210                 pdev->msi_enabled = 1;
 211                 rc = pci_enable_device(pdev);
 212         }
 213         if (rc) {
 214                 wil_err(wil,
 215                         "pci_enable_device failed, even with MSI only\n");
 216                 goto err_plat;
 217         }
 218         /* rollback to err_disable_pdev */
 219
 220         rc = pci_request_region(pdev, 0, WIL_NAME);
 221         if (rc) {
 222                 wil_err(wil, "pci_request_region failed\n");
 223                 goto err_disable_pdev;
 224         }
 225         /* rollback to err_release_reg */
 226
 227         wil->csr = pci_ioremap_bar(pdev, 0);
 228         if (!wil->csr) {
 229                 wil_err(wil, "pci_ioremap_bar failed\n");
 230                 rc = -ENODEV;
 231                 goto err_release_reg;
 232         }
 233         /* rollback to err_iounmap */
 234         wil_info(wil, "CSR at %pR -> 0x%p\n", &pdev->resource[0], wil->csr);
 235
 236         wil_set_capabilities(wil);
 237         wil6210_clear_irq(wil);
 238
 239         /* FW should raise IRQ when ready */
 240         rc = wil_if_pcie_enable(wil);
 241         if (rc) {
 242                 wil_err(wil, "Enable device failed\n");
 243                 goto err_iounmap;
 244         }
 245         /* rollback to bus_disable */
 246
 247         rc = wil_if_add(wil);
 248         if (rc) {
 249                 wil_err(wil, "wil_if_add failed: %d\n", rc);
 250                 goto bus_disable;
 251         }
 252
 253 #ifdef CONFIG_PM
 254 #ifdef CONFIG_PM_SLEEP
 255         wil->pm_notify.notifier_call = wil6210_pm_notify;
 256         rc = register_pm_notifier(&wil->pm_notify);
 257         if (rc)
 258                 /* Do not fail the driver initialization, as suspend can
 259                  * be prevented in a later phase if needed
 260                  */
 261                 wil_err(wil, "register_pm_notifier failed: %d\n", rc);
 262 #endif /* CONFIG_PM_SLEEP */
 263 #endif /* CONFIG_PM */
 264
 265         wil6210_debugfs_init(wil);
 266
 267
 268         return 0;
 269
 270 bus_disable:
 271         wil_if_pcie_disable(wil);
 272 err_iounmap:
 273         pci_iounmap(pdev, wil->csr);
 274 err_release_reg:
 275         pci_release_region(pdev, 0);
 276 err_disable_pdev:
 277         pci_disable_device(pdev);
 278 err_plat:
 279         if (wil->platform_ops.uninit)
 280                 wil->platform_ops.uninit(wil->platform_handle);
 281 if_free:
 282         wil_if_free(wil);
 283
 284         return rc;
 285 }
 286
 287 static void wil_pcie_remove(struct pci_dev *pdev)
 288 {
 289         struct wil6210_priv *wil = pci_get_drvdata(pdev);
 290         void __iomem *csr = wil->csr;
 291
 292         wil_dbg_misc(wil, "%s()\n", __func__);
 293
 294 #ifdef CONFIG_PM
 295 #ifdef CONFIG_PM_SLEEP
 296         unregister_pm_notifier(&wil->pm_notify);
 297 #endif /* CONFIG_PM_SLEEP */
 298 #endif /* CONFIG_PM */
 299
 300         wil6210_debugfs_remove(wil);
 301         rtnl_lock();
 302         wil_p2p_wdev_free(wil);
 303         rtnl_unlock();
 304         wil_if_remove(wil);
 305         wil_if_pcie_disable(wil);
 306         pci_iounmap(pdev, csr);
 307         pci_release_region(pdev, 0);
 308         pci_disable_device(pdev);
 309         if (wil->platform_ops.uninit)
 310                 wil->platform_ops.uninit(wil->platform_handle);
 311         wil_if_free(wil);
 312 }
 313
 314 static const struct pci_device_id wil6210_pcie_ids[] = {
 315         { PCI_DEVICE(0x1ae9, 0x0310) },
 316         { PCI_DEVICE(0x1ae9, 0x0302) }, /* same as above, firmware broken */
 317         { /* end: all zeroes */ },
 318 };
 319 MODULE_DEVICE_TABLE(pci, wil6210_pcie_ids);
 320
 321 #ifdef CONFIG_PM
 322 #ifdef CONFIG_PM_SLEEP
 323
 324 static int wil6210_suspend(struct device *dev, bool is_runtime)
 325 {
 326         int rc = 0;
 327         struct pci_dev *pdev = to_pci_dev(dev);
 328         struct wil6210_priv *wil = pci_get_drvdata(pdev);
 329
 330         wil_dbg_pm(wil, "%s(%s)\n", __func__,
 331                    is_runtime ? "runtime" : "system");
 332
 333         rc = wil_can_suspend(wil, is_runtime);
 334         if (rc)
 335                 goto out;
 336
 337         rc = wil_suspend(wil, is_runtime);
 338         if (rc)
 339                 goto out;
 340
 341         /* TODO: how do I bring card in low power state? */
 342
 343         /* disable bus mastering */
 344         pci_clear_master(pdev);
 345         /* PCI will call pci_save_state(pdev) and pci_prepare_to_sleep(pdev) */
 346
 347 out:
 348         return rc;
 349 }
 350
 351 static int wil6210_resume(struct device *dev, bool is_runtime)
 352 {
 353         int rc = 0;
 354         struct pci_dev *pdev = to_pci_dev(dev);
 355         struct wil6210_priv *wil = pci_get_drvdata(pdev);
 356
 357         wil_dbg_pm(wil, "%s(%s)\n", __func__,
 358                    is_runtime ? "runtime" : "system");
 359
 360         /* allow master */
 361         pci_set_master(pdev);
 362
 363         rc = wil_resume(wil, is_runtime);
 364         if (rc)
 365                 pci_clear_master(pdev);
 366
 367         return rc;
 368 }
 369
 370 static int wil6210_pm_notify(struct notifier_block *notify_block,
 371                              unsigned long mode, void *unused)
 372 {
 373         struct wil6210_priv *wil = container_of(
 374                 notify_block, struct wil6210_priv, pm_notify);
 375         int rc = 0;
 376         enum wil_platform_event evt;
 377
 378         wil_dbg_pm(wil, "%s: mode (%ld)\n", __func__, mode);
 379
 380         switch (mode) {
 381         case PM_HIBERNATION_PREPARE:
 382         case PM_SUSPEND_PREPARE:
 383         case PM_RESTORE_PREPARE:
 384                 rc = wil_can_suspend(wil, false);
 385                 if (rc)
 386                         break;
 387                 evt = WIL_PLATFORM_EVT_PRE_SUSPEND;
 388                 if (wil->platform_ops.notify)
 389                         rc = wil->platform_ops.notify(wil->platform_handle,
 390                                                       evt);
 391                 break;
 392         case PM_POST_SUSPEND:
 393         case PM_POST_HIBERNATION:
 394         case PM_POST_RESTORE:
 395                 evt = WIL_PLATFORM_EVT_POST_SUSPEND;
 396                 if (wil->platform_ops.notify)
 397                         rc = wil->platform_ops.notify(wil->platform_handle,
 398                                                       evt);
 399                 break;
 400         default:
 401                 wil_dbg_pm(wil, "unhandled notify mode %ld\n", mode);
 402                 break;
 403         }
 404
 405         wil_dbg_pm(wil, "notification mode %ld: rc (%d)\n", mode, rc);
 406         return rc;
 407 }
 408
 409 static int wil6210_pm_suspend(struct device *dev)
 410 {
 411         return wil6210_suspend(dev, false);
 412 }
 413
 414 static int wil6210_pm_resume(struct device *dev)
 415 {
 416         return wil6210_resume(dev, false);
 417 }
 418 #endif /* CONFIG_PM_SLEEP */
 419
 420 #endif /* CONFIG_PM */
 421
 422 static const struct dev_pm_ops wil6210_pm_ops = {
 423         SET_SYSTEM_SLEEP_PM_OPS(wil6210_pm_suspend, wil6210_pm_resume)
 424 };
 425
 426 static struct pci_driver wil6210_driver = {
 427         .probe          = wil_pcie_probe,
 428         .remove         = wil_pcie_remove,
 429         .id_table       = wil6210_pcie_ids,
 430         .name           = WIL_NAME,
 431         .driver         = {
 432                 .pm = &wil6210_pm_ops,
 433         },
 434 };
 435
 436 static int __init wil6210_driver_init(void)
 437 {
 438         int rc;
 439
 440         rc = wil_platform_modinit();
 441         if (rc)
 442                 return rc;
 443
 444         rc = pci_register_driver(&wil6210_driver);
 445         if (rc)
 446                 wil_platform_modexit();
 447         return rc;
 448 }
 449 module_init(wil6210_driver_init);
 450
 451 static void __exit wil6210_driver_exit(void)
 452 {
 453         pci_unregister_driver(&wil6210_driver);
 454         wil_platform_modexit();
 455 }
 456 module_exit(wil6210_driver_exit);
 457
 458 MODULE_LICENSE("Dual BSD/GPL");
 459 MODULE_AUTHOR("Qualcomm Atheros <wil6210@qca.qualcomm.com>");
 460 MODULE_DESCRIPTION("Driver for 60g WiFi WIL6210 card");