LXR linux/drivers/net/wireless/ath/wil6210/pcie

   1/*
   2 * Copyright (c) 2012 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/debugfs.h>
  19#include <linux/pci.h>
  20#include <linux/moduleparam.h>
  21
  22#include "wil6210.h"
  23
  24static int use_msi = 1;
  25module_param(use_msi, int, S_IRUGO);
  26MODULE_PARM_DESC(use_msi,
  27                 " Use MSI interrupt: "
  28                 "0 - don't, 1 - (default) - single, or 3");
  29
  30/* Bus ops */
  31static int wil_if_pcie_enable(struct wil6210_priv *wil)
  32{
  33        struct pci_dev *pdev = wil->pdev;
  34        int rc;
  35
  36        pci_set_master(pdev);
  37
  38        /*
  39         * how many MSI interrupts to request?
  40         */
  41        switch (use_msi) {
  42        case 3:
  43        case 1:
  44        case 0:
  45                break;
  46        default:
  47                wil_err(wil, "Invalid use_msi=%d, default to 1\n",
  48                        use_msi);
  49                use_msi = 1;
  50        }
  51        wil->n_msi = use_msi;
  52        if (wil->n_msi) {
  53                wil_dbg_misc(wil, "Setup %d MSI interrupts\n", use_msi);
  54                rc = pci_enable_msi_block(pdev, wil->n_msi);
  55                if (rc && (wil->n_msi == 3)) {
  56                        wil_err(wil, "3 MSI mode failed, try 1 MSI\n");
  57                        wil->n_msi = 1;
  58                        rc = pci_enable_msi_block(pdev, wil->n_msi);
  59                }
  60                if (rc) {
  61                        wil_err(wil, "pci_enable_msi failed, use INTx\n");
  62                        wil->n_msi = 0;
  63                }
  64        } else {
  65                wil_dbg_misc(wil, "MSI interrupts disabled, use INTx\n");
  66        }
  67
  68        rc = wil6210_init_irq(wil, pdev->irq);
  69        if (rc)
  70                goto stop_master;
  71
  72        /* need reset here to obtain MAC */
  73        rc = wil_reset(wil);
  74        if (rc)
  75                goto release_irq;
  76
  77        return 0;
  78
  79 release_irq:
  80        wil6210_fini_irq(wil, pdev->irq);
  81        /* safe to call if no MSI */
  82        pci_disable_msi(pdev);
  83 stop_master:
  84        pci_clear_master(pdev);
  85        return rc;
  86}
  87
  88static int wil_if_pcie_disable(struct wil6210_priv *wil)
  89{
  90        struct pci_dev *pdev = wil->pdev;
  91
  92        pci_clear_master(pdev);
  93        /* disable and release IRQ */
  94        wil6210_fini_irq(wil, pdev->irq);
  95        /* safe to call if no MSI */
  96        pci_disable_msi(pdev);
  97        /* TODO: disable HW */
  98
  99        return 0;
 100}
 101
 102static int wil_pcie_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 103{
 104        struct wil6210_priv *wil;
 105        struct device *dev = &pdev->dev;
 106        void __iomem *csr;
 107        int rc;
 108
 109        /* check HW */
 110        dev_info(&pdev->dev, WIL_NAME " device found [%04x:%04x] (rev %x)\n",
 111                 (int)pdev->vendor, (int)pdev->device, (int)pdev->revision);
 112
 113        if (pci_resource_len(pdev, 0) != WIL6210_MEM_SIZE) {
 114                dev_err(&pdev->dev, "Not " WIL_NAME "? "
 115                        "BAR0 size is %lu while expecting %lu\n",
 116                        (ulong)pci_resource_len(pdev, 0), WIL6210_MEM_SIZE);
 117                return -ENODEV;
 118        }
 119
 120        rc = pci_enable_device(pdev);
 121        if (rc) {
 122                dev_err(&pdev->dev, "pci_enable_device failed\n");
 123                return -ENODEV;
 124        }
 125        /* rollback to err_disable_pdev */
 126
 127        rc = pci_request_region(pdev, 0, WIL_NAME);
 128        if (rc) {
 129                dev_err(&pdev->dev, "pci_request_region failed\n");
 130                goto err_disable_pdev;
 131        }
 132        /* rollback to err_release_reg */
 133
 134        csr = pci_ioremap_bar(pdev, 0);
 135        if (!csr) {
 136                dev_err(&pdev->dev, "pci_ioremap_bar failed\n");
 137                rc = -ENODEV;
 138                goto err_release_reg;
 139        }
 140        /* rollback to err_iounmap */
 141        dev_info(&pdev->dev, "CSR at %pR -> %p\n", &pdev->resource[0], csr);
 142
 143        wil = wil_if_alloc(dev, csr);
 144        if (IS_ERR(wil)) {
 145                rc = (int)PTR_ERR(wil);
 146                dev_err(dev, "wil_if_alloc failed: %d\n", rc);
 147                goto err_iounmap;
 148        }
 149        /* rollback to if_free */
 150
 151        pci_set_drvdata(pdev, wil);
 152        wil->pdev = pdev;
 153
 154        /* FW should raise IRQ when ready */
 155        rc = wil_if_pcie_enable(wil);
 156        if (rc) {
 157                wil_err(wil, "Enable device failed\n");
 158                goto if_free;
 159        }
 160        /* rollback to bus_disable */
 161
 162        rc = wil_if_add(wil);
 163        if (rc) {
 164                wil_err(wil, "wil_if_add failed: %d\n", rc);
 165                goto bus_disable;
 166        }
 167
 168        wil6210_debugfs_init(wil);
 169
 170        /* check FW is alive */
 171        wmi_echo(wil);
 172
 173        return 0;
 174
 175 bus_disable:
 176        wil_if_pcie_disable(wil);
 177 if_free:
 178        wil_if_free(wil);
 179 err_iounmap:
 180        pci_iounmap(pdev, csr);
 181 err_release_reg:
 182        pci_release_region(pdev, 0);
 183 err_disable_pdev:
 184        pci_disable_device(pdev);
 185
 186        return rc;
 187}
 188
 189static void wil_pcie_remove(struct pci_dev *pdev)
 190{
 191        struct wil6210_priv *wil = pci_get_drvdata(pdev);
 192
 193        wil6210_debugfs_remove(wil);
 194        wil_if_pcie_disable(wil);
 195        wil_if_remove(wil);
 196        wil_if_free(wil);
 197        pci_iounmap(pdev, wil->csr);
 198        pci_release_region(pdev, 0);
 199        pci_disable_device(pdev);
 200        pci_set_drvdata(pdev, NULL);
 201}
 202
 203static DEFINE_PCI_DEVICE_TABLE(wil6210_pcie_ids) = {
 204        { PCI_DEVICE(0x1ae9, 0x0301) },
 205        { /* end: all zeroes */ },
 206};
 207MODULE_DEVICE_TABLE(pci, wil6210_pcie_ids);
 208
 209static struct pci_driver wil6210_driver = {
 210        .probe          = wil_pcie_probe,
 211        .remove         = wil_pcie_remove,
 212        .id_table       = wil6210_pcie_ids,
 213        .name           = WIL_NAME,
 214};
 215
 216module_pci_driver(wil6210_driver);
 217
 218MODULE_LICENSE("Dual BSD/GPL");
 219MODULE_AUTHOR("Qualcomm Atheros <wil6210@qca.qualcomm.com>");
 220MODULE_DESCRIPTION("Driver for 60g WiFi WIL6210 card");
 221