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