drivers/staging/sbe-2t3e3/module.c

   1 /*
   2  * SBE 2T3E3 synchronous serial card driver for Linux
   3  *
   4  * Copyright (C) 2009-2010 Krzysztof Halasa <khc@pm.waw.pl>
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of version 2 of the GNU General Public License
   8  * as published by the Free Software Foundation.
   9  *
  10  * This code is based on a driver written by SBE Inc.
  11  */
  12
  13 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  14
  15 #include <linux/module.h>
  16 #include <linux/slab.h>
  17 #include <linux/delay.h>
  18 #include <linux/netdevice.h>
  19 #include <linux/pci.h>
  20 #include <linux/hdlc.h>
  21 #include <linux/if_arp.h>
  22 #include <linux/interrupt.h>
  23 #include "2t3e3.h"
  24
  25 static void check_leds(unsigned long arg)
  26 {
  27         struct card *card = (struct card *)arg;
  28         struct channel *channel0 = &card->channels[0];
  29         static int blinker;
  30
  31         update_led(channel0, ++blinker);
  32         if (has_two_ports(channel0->pdev))
  33                 update_led(&card->channels[1], blinker);
  34
  35         card->timer.expires = jiffies + HZ / 10;
  36         add_timer(&card->timer);
  37 }
  38
  39 static void t3e3_remove_channel(struct channel *channel)
  40 {
  41         struct pci_dev *pdev = channel->pdev;
  42         struct net_device *dev = channel->dev;
  43
  44         /* system hangs if board asserts irq while module is unloaded */
  45         cpld_stop_intr(channel);
  46         free_irq(dev->irq, dev);
  47         dc_drop_descriptor_list(channel);
  48         unregister_hdlc_device(dev);
  49         free_netdev(dev);
  50         pci_release_regions(pdev);
  51         pci_disable_device(pdev);
  52         pci_set_drvdata(pdev, NULL);
  53 }
  54
  55 static int t3e3_init_channel(struct channel *channel, struct pci_dev *pdev, struct card *card)
  56 {
  57         struct net_device *dev;
  58         unsigned int val;
  59         int err;
  60
  61         err = pci_enable_device(pdev);
  62         if (err)
  63                 return err;
  64
  65         err = pci_request_regions(pdev, "SBE 2T3E3");
  66         if (err)
  67                 goto disable;
  68
  69         dev = alloc_hdlcdev(channel);
  70         if (!dev) {
  71                 pr_err("Out of memory\n");
  72                 err = -ENOMEM;
  73                 goto free_regions;
  74         }
  75
  76         t3e3_sc_init(channel);
  77         dev_to_priv(dev) = channel;
  78
  79         channel->pdev = pdev;
  80         channel->dev = dev;
  81         channel->card = card;
  82         channel->addr = pci_resource_start(pdev, 0);
  83         if (pdev->subsystem_device == PCI_SUBDEVICE_ID_SBE_2T3E3_P1)
  84                 channel->h.slot = 1;
  85         else
  86                 channel->h.slot = 0;
  87
  88         err = setup_device(dev, channel);
  89         if (err)
  90                 goto free_dev;
  91
  92         pci_read_config_dword(channel->pdev, 0x40, &val); /* mask sleep mode */
  93         pci_write_config_dword(channel->pdev, 0x40, val & 0x3FFFFFFF);
  94
  95         pci_read_config_byte(channel->pdev, PCI_CACHE_LINE_SIZE, &channel->h.cache_size);
  96         pci_read_config_dword(channel->pdev, PCI_COMMAND, &channel->h.command);
  97         t3e3_init(channel);
  98
  99         err = request_irq(dev->irq, &t3e3_intr, IRQF_SHARED, dev->name, dev);
 100         if (err) {
 101                 netdev_warn(channel->dev, "%s: could not get irq: %d\n",
 102                             dev->name, dev->irq);
 103                 goto unregister_dev;
 104         }
 105
 106         pci_set_drvdata(pdev, channel);
 107         return 0;
 108
 109 unregister_dev:
 110         unregister_hdlc_device(dev);
 111 free_dev:
 112         free_netdev(dev);
 113 free_regions:
 114         pci_release_regions(pdev);
 115 disable:
 116         pci_disable_device(pdev);
 117         return err;
 118 }
 119
 120 static void t3e3_remove_card(struct pci_dev *pdev)
 121 {
 122         struct channel *channel0 = pci_get_drvdata(pdev);
 123         struct card *card = channel0->card;
 124
 125         del_timer(&card->timer);
 126         if (has_two_ports(channel0->pdev)) {
 127                 t3e3_remove_channel(&card->channels[1]);
 128                 pci_dev_put(card->channels[1].pdev);
 129         }
 130         t3e3_remove_channel(channel0);
 131         kfree(card);
 132 }
 133
 134 static int t3e3_init_card(struct pci_dev *pdev, const struct pci_device_id *ent)
 135 {
 136         /* pdev points to channel #0 */
 137         struct pci_dev *pdev1 = NULL;
 138         struct card *card;
 139         int channels = 1, err;
 140
 141         if (has_two_ports(pdev)) {
 142                 while ((pdev1 = pci_get_subsys(PCI_VENDOR_ID_DEC, PCI_DEVICE_ID_DEC_21142,
 143                                                PCI_VENDOR_ID_SBE, PCI_SUBDEVICE_ID_SBE_2T3E3_P1,
 144                                                pdev1)))
 145                         if (pdev1->bus == pdev->bus &&
 146                             pdev1->devfn == pdev->devfn + 8 /* next device on the same bus */)
 147                                 break; /* found the second channel */
 148
 149                 if (!pdev1) {
 150                         dev_err(&pdev->dev, "Can't find the second channel\n");
 151                         return -EFAULT;
 152                 }
 153                 channels = 2;
 154                 /* holds the reference for pdev1 */
 155         }
 156
 157         card = kzalloc(sizeof(struct card) + channels * sizeof(struct channel),
 158                        GFP_KERNEL);
 159         if (!card)
 160                 return -ENOBUFS;
 161
 162         spin_lock_init(&card->bootrom_lock);
 163         card->bootrom_addr = pci_resource_start(pdev, 0);
 164
 165         err = t3e3_init_channel(&card->channels[0], pdev, card);
 166         if (err)
 167                 goto free_card;
 168
 169         if (channels == 2) {
 170                 err = t3e3_init_channel(&card->channels[1], pdev1, card);
 171                 if (err) {
 172                         t3e3_remove_channel(&card->channels[0]);
 173                         goto free_card;
 174                 }
 175         }
 176
 177         /* start LED timer */
 178         init_timer(&card->timer);
 179         card->timer.function = check_leds;
 180         card->timer.expires = jiffies + HZ / 10;
 181         card->timer.data = (unsigned long)card;
 182         add_timer(&card->timer);
 183         return 0;
 184
 185 free_card:
 186         kfree(card);
 187         return err;
 188 }
 189
 190 static struct pci_device_id t3e3_pci_tbl[] = {
 191         { PCI_VENDOR_ID_DEC, PCI_DEVICE_ID_DEC_21142,
 192           PCI_VENDOR_ID_SBE, PCI_SUBDEVICE_ID_SBE_T3E3, 0, 0, 0 },
 193         { PCI_VENDOR_ID_DEC, PCI_DEVICE_ID_DEC_21142,
 194           PCI_VENDOR_ID_SBE, PCI_SUBDEVICE_ID_SBE_2T3E3_P0, 0, 0, 0 },
 195         /* channel 1 will be initialized after channel 0 */
 196         { 0, }
 197 };
 198
 199 static struct pci_driver t3e3_pci_driver = {
 200         .name     = "SBE T3E3",
 201         .id_table = t3e3_pci_tbl,
 202         .probe    = t3e3_init_card,
 203         .remove   = t3e3_remove_card,
 204 };
 205
 206 module_pci_driver(t3e3_pci_driver);
 207 MODULE_LICENSE("GPL");
 208 MODULE_DEVICE_TABLE(pci, t3e3_pci_tbl);