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

   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
  24 static int use_msi = 1;
  25 module_param(use_msi, int, S_IRUGO);
  26 MODULE_PARM_DESC(use_msi,
  27                  " Use MSI interrupt: "
  28                  "0 - don't, 1 - (default) - single, or 3");
  29
  30 /* Bus ops */
  31 static 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
  88 static 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
 102 static 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
 189 static 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 }
 201
 202 static DEFINE_PCI_DEVICE_TABLE(wil6210_pcie_ids) = {
 203         { PCI_DEVICE(0x1ae9, 0x0301) },
 204         { /* end: all zeroes */ },
 205 };
 206 MODULE_DEVICE_TABLE(pci, wil6210_pcie_ids);
 207
 208 static struct pci_driver wil6210_driver = {
 209         .probe          = wil_pcie_probe,
 210         .remove         = wil_pcie_remove,
 211         .id_table       = wil6210_pcie_ids,
 212         .name           = WIL_NAME,
 213 };
 214
 215 module_pci_driver(wil6210_driver);
 216
 217 MODULE_LICENSE("Dual BSD/GPL");
 218 MODULE_AUTHOR("Qualcomm Atheros <wil6210@qca.qualcomm.com>");
 219 MODULE_DESCRIPTION("Driver for 60g WiFi WIL6210 card");