linux/drivers/net/wireless/ath/wil6210/pcie_bus.c
<<
>>
Prefs
   1/*
   2 * Copyright (c) 2012-2015 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
  22#include "wil6210.h"
  23
  24static bool use_msi = true;
  25module_param(use_msi, bool, S_IRUGO);
  26MODULE_PARM_DESC(use_msi, " Use MSI interrupt, default - true");
  27
  28static
  29void wil_set_capabilities(struct wil6210_priv *wil)
  30{
  31        u32 rev_id = wil_r(wil, RGF_USER_JTAG_DEV_ID);
  32
  33        bitmap_zero(wil->hw_capabilities, hw_capability_last);
  34
  35        switch (rev_id) {
  36        case JTAG_DEV_ID_SPARROW_B0:
  37                wil->hw_name = "Sparrow B0";
  38                wil->hw_version = HW_VER_SPARROW_B0;
  39                break;
  40        default:
  41                wil_err(wil, "Unknown board hardware 0x%08x\n", rev_id);
  42                wil->hw_name = "Unknown";
  43                wil->hw_version = HW_VER_UNKNOWN;
  44        }
  45
  46        wil_info(wil, "Board hardware is %s\n", wil->hw_name);
  47}
  48
  49void wil_disable_irq(struct wil6210_priv *wil)
  50{
  51        disable_irq(wil->pdev->irq);
  52}
  53
  54void wil_enable_irq(struct wil6210_priv *wil)
  55{
  56        enable_irq(wil->pdev->irq);
  57}
  58
  59/* Bus ops */
  60static int wil_if_pcie_enable(struct wil6210_priv *wil)
  61{
  62        struct pci_dev *pdev = wil->pdev;
  63        int rc;
  64        /* on platforms with buggy ACPI, pdev->msi_enabled may be set to
  65         * allow pci_enable_device to work. This indicates INTx was not routed
  66         * and only MSI should be used
  67         */
  68        int msi_only = pdev->msi_enabled;
  69        bool _use_msi = use_msi;
  70
  71        wil_dbg_misc(wil, "%s()\n", __func__);
  72
  73        pdev->msi_enabled = 0;
  74
  75        pci_set_master(pdev);
  76
  77        wil_dbg_misc(wil, "Setup %s interrupt\n", use_msi ? "MSI" : "INTx");
  78
  79        if (use_msi && pci_enable_msi(pdev)) {
  80                wil_err(wil, "pci_enable_msi failed, use INTx\n");
  81                _use_msi = false;
  82        }
  83
  84        if (!_use_msi && msi_only) {
  85                wil_err(wil, "Interrupt pin not routed, unable to use INTx\n");
  86                rc = -ENODEV;
  87                goto stop_master;
  88        }
  89
  90        rc = wil6210_init_irq(wil, pdev->irq, _use_msi);
  91        if (rc)
  92                goto stop_master;
  93
  94        /* need reset here to obtain MAC */
  95        mutex_lock(&wil->mutex);
  96        rc = wil_reset(wil, false);
  97        mutex_unlock(&wil->mutex);
  98        if (rc)
  99                goto release_irq;
 100
 101        return 0;
 102
 103 release_irq:
 104        wil6210_fini_irq(wil, pdev->irq);
 105        /* safe to call if no MSI */
 106        pci_disable_msi(pdev);
 107 stop_master:
 108        pci_clear_master(pdev);
 109        return rc;
 110}
 111
 112static int wil_if_pcie_disable(struct wil6210_priv *wil)
 113{
 114        struct pci_dev *pdev = wil->pdev;
 115
 116        wil_dbg_misc(wil, "%s()\n", __func__);
 117
 118        pci_clear_master(pdev);
 119        /* disable and release IRQ */
 120        wil6210_fini_irq(wil, pdev->irq);
 121        /* safe to call if no MSI */
 122        pci_disable_msi(pdev);
 123        /* TODO: disable HW */
 124
 125        return 0;
 126}
 127
 128static int wil_platform_rop_ramdump(void *wil_handle, void *buf, uint32_t size)
 129{
 130        struct wil6210_priv *wil = wil_handle;
 131
 132        if (!wil)
 133                return -EINVAL;
 134
 135        return wil_fw_copy_crash_dump(wil, buf, size);
 136}
 137
 138static int wil_platform_rop_fw_recovery(void *wil_handle)
 139{
 140        struct wil6210_priv *wil = wil_handle;
 141
 142        if (!wil)
 143                return -EINVAL;
 144
 145        wil_fw_error_recovery(wil);
 146
 147        return 0;
 148}
 149
 150static int wil_pcie_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 151{
 152        struct wil6210_priv *wil;
 153        struct device *dev = &pdev->dev;
 154        int rc;
 155        const struct wil_platform_rops rops = {
 156                .ramdump = wil_platform_rop_ramdump,
 157                .fw_recovery = wil_platform_rop_fw_recovery,
 158        };
 159
 160        /* check HW */
 161        dev_info(&pdev->dev, WIL_NAME
 162                 " device found [%04x:%04x] (rev %x)\n",
 163                 (int)pdev->vendor, (int)pdev->device, (int)pdev->revision);
 164
 165        if (pci_resource_len(pdev, 0) != WIL6210_MEM_SIZE) {
 166                dev_err(&pdev->dev, "Not " WIL_NAME "? "
 167                        "BAR0 size is %lu while expecting %lu\n",
 168                        (ulong)pci_resource_len(pdev, 0), WIL6210_MEM_SIZE);
 169                return -ENODEV;
 170        }
 171
 172        wil = wil_if_alloc(dev);
 173        if (IS_ERR(wil)) {
 174                rc = (int)PTR_ERR(wil);
 175                dev_err(dev, "wil_if_alloc failed: %d\n", rc);
 176                return rc;
 177        }
 178        wil->pdev = pdev;
 179        pci_set_drvdata(pdev, wil);
 180        /* rollback to if_free */
 181
 182        wil->platform_handle =
 183                wil_platform_init(&pdev->dev, &wil->platform_ops, &rops, wil);
 184        if (!wil->platform_handle) {
 185                rc = -ENODEV;
 186                wil_err(wil, "wil_platform_init failed\n");
 187                goto if_free;
 188        }
 189        /* rollback to err_plat */
 190
 191        rc = pci_enable_device(pdev);
 192        if (rc) {
 193                wil_err(wil,
 194                        "pci_enable_device failed, retry with MSI only\n");
 195                /* Work around for platforms that can't allocate IRQ:
 196                 * retry with MSI only
 197                 */
 198                pdev->msi_enabled = 1;
 199                rc = pci_enable_device(pdev);
 200        }
 201        if (rc) {
 202                wil_err(wil,
 203                        "pci_enable_device failed, even with MSI only\n");
 204                goto err_plat;
 205        }
 206        /* rollback to err_disable_pdev */
 207
 208        rc = pci_request_region(pdev, 0, WIL_NAME);
 209        if (rc) {
 210                wil_err(wil, "pci_request_region failed\n");
 211                goto err_disable_pdev;
 212        }
 213        /* rollback to err_release_reg */
 214
 215        wil->csr = pci_ioremap_bar(pdev, 0);
 216        if (!wil->csr) {
 217                wil_err(wil, "pci_ioremap_bar failed\n");
 218                rc = -ENODEV;
 219                goto err_release_reg;
 220        }
 221        /* rollback to err_iounmap */
 222        wil_info(wil, "CSR at %pR -> 0x%p\n", &pdev->resource[0], wil->csr);
 223
 224        wil_set_capabilities(wil);
 225        wil6210_clear_irq(wil);
 226
 227        /* FW should raise IRQ when ready */
 228        rc = wil_if_pcie_enable(wil);
 229        if (rc) {
 230                wil_err(wil, "Enable device failed\n");
 231                goto err_iounmap;
 232        }
 233        /* rollback to bus_disable */
 234
 235        rc = wil_if_add(wil);
 236        if (rc) {
 237                wil_err(wil, "wil_if_add failed: %d\n", rc);
 238                goto bus_disable;
 239        }
 240
 241        wil6210_debugfs_init(wil);
 242
 243
 244        return 0;
 245
 246bus_disable:
 247        wil_if_pcie_disable(wil);
 248err_iounmap:
 249        pci_iounmap(pdev, wil->csr);
 250err_release_reg:
 251        pci_release_region(pdev, 0);
 252err_disable_pdev:
 253        pci_disable_device(pdev);
 254err_plat:
 255        if (wil->platform_ops.uninit)
 256                wil->platform_ops.uninit(wil->platform_handle);
 257if_free:
 258        wil_if_free(wil);
 259
 260        return rc;
 261}
 262
 263static void wil_pcie_remove(struct pci_dev *pdev)
 264{
 265        struct wil6210_priv *wil = pci_get_drvdata(pdev);
 266        void __iomem *csr = wil->csr;
 267
 268        wil_dbg_misc(wil, "%s()\n", __func__);
 269
 270        wil6210_debugfs_remove(wil);
 271        wil_if_remove(wil);
 272        wil_if_pcie_disable(wil);
 273        pci_iounmap(pdev, csr);
 274        pci_release_region(pdev, 0);
 275        pci_disable_device(pdev);
 276        if (wil->platform_ops.uninit)
 277                wil->platform_ops.uninit(wil->platform_handle);
 278        wil_p2p_wdev_free(wil);
 279        wil_if_free(wil);
 280}
 281
 282static const struct pci_device_id wil6210_pcie_ids[] = {
 283        { PCI_DEVICE(0x1ae9, 0x0310) },
 284        { PCI_DEVICE(0x1ae9, 0x0302) }, /* same as above, firmware broken */
 285        { /* end: all zeroes */ },
 286};
 287MODULE_DEVICE_TABLE(pci, wil6210_pcie_ids);
 288
 289#ifdef CONFIG_PM
 290#ifdef CONFIG_PM_SLEEP
 291
 292static int wil6210_suspend(struct device *dev, bool is_runtime)
 293{
 294        int rc = 0;
 295        struct pci_dev *pdev = to_pci_dev(dev);
 296        struct wil6210_priv *wil = pci_get_drvdata(pdev);
 297
 298        wil_dbg_pm(wil, "%s(%s)\n", __func__,
 299                   is_runtime ? "runtime" : "system");
 300
 301        rc = wil_can_suspend(wil, is_runtime);
 302        if (rc)
 303                goto out;
 304
 305        rc = wil_suspend(wil, is_runtime);
 306        if (rc)
 307                goto out;
 308
 309        /* TODO: how do I bring card in low power state? */
 310
 311        /* disable bus mastering */
 312        pci_clear_master(pdev);
 313        /* PCI will call pci_save_state(pdev) and pci_prepare_to_sleep(pdev) */
 314
 315out:
 316        return rc;
 317}
 318
 319static int wil6210_resume(struct device *dev, bool is_runtime)
 320{
 321        int rc = 0;
 322        struct pci_dev *pdev = to_pci_dev(dev);
 323        struct wil6210_priv *wil = pci_get_drvdata(pdev);
 324
 325        wil_dbg_pm(wil, "%s(%s)\n", __func__,
 326                   is_runtime ? "runtime" : "system");
 327
 328        /* allow master */
 329        pci_set_master(pdev);
 330
 331        rc = wil_resume(wil, is_runtime);
 332        if (rc)
 333                pci_clear_master(pdev);
 334
 335        return rc;
 336}
 337
 338static int wil6210_pm_suspend(struct device *dev)
 339{
 340        return wil6210_suspend(dev, false);
 341}
 342
 343static int wil6210_pm_resume(struct device *dev)
 344{
 345        return wil6210_resume(dev, false);
 346}
 347#endif /* CONFIG_PM_SLEEP */
 348
 349#endif /* CONFIG_PM */
 350
 351static const struct dev_pm_ops wil6210_pm_ops = {
 352        SET_SYSTEM_SLEEP_PM_OPS(wil6210_pm_suspend, wil6210_pm_resume)
 353};
 354
 355static struct pci_driver wil6210_driver = {
 356        .probe          = wil_pcie_probe,
 357        .remove         = wil_pcie_remove,
 358        .id_table       = wil6210_pcie_ids,
 359        .name           = WIL_NAME,
 360        .driver         = {
 361                .pm = &wil6210_pm_ops,
 362        },
 363};
 364
 365static int __init wil6210_driver_init(void)
 366{
 367        int rc;
 368
 369        rc = wil_platform_modinit();
 370        if (rc)
 371                return rc;
 372
 373        rc = pci_register_driver(&wil6210_driver);
 374        if (rc)
 375                wil_platform_modexit();
 376        return rc;
 377}
 378module_init(wil6210_driver_init);
 379
 380static void __exit wil6210_driver_exit(void)
 381{
 382        pci_unregister_driver(&wil6210_driver);
 383        wil_platform_modexit();
 384}
 385module_exit(wil6210_driver_exit);
 386
 387MODULE_LICENSE("Dual BSD/GPL");
 388MODULE_AUTHOR("Qualcomm Atheros <wil6210@qca.qualcomm.com>");
 389MODULE_DESCRIPTION("Driver for 60g WiFi WIL6210 card");
 390
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.