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                 goto free_regions;
  71         }
  72
  73         t3e3_sc_init(channel);
  74         dev_to_priv(dev) = channel;
  75
  76         channel->pdev = pdev;
  77         channel->dev = dev;
  78         channel->card = card;
  79         channel->addr = pci_resource_start(pdev, 0);
  80         if (pdev->subsystem_device == PCI_SUBDEVICE_ID_SBE_2T3E3_P1)
  81                 channel->h.slot = 1;
  82         else
  83                 channel->h.slot = 0;
  84
  85         if (setup_device(dev, channel))
  86                 goto free_regions;
  87
  88         pci_read_config_dword(channel->pdev, 0x40, &val); /* mask sleep mode */
  89         pci_write_config_dword(channel->pdev, 0x40, val & 0x3FFFFFFF);
  90
  91         pci_read_config_byte(channel->pdev, PCI_CACHE_LINE_SIZE, &channel->h.cache_size);
  92         pci_read_config_dword(channel->pdev, PCI_COMMAND, &channel->h.command);
  93         t3e3_init(channel);
  94
  95         if (request_irq(dev->irq, &t3e3_intr, IRQF_SHARED, dev->name, dev)) {
  96                 printk(KERN_WARNING "%s: could not get irq: %d\n", dev->name, dev->irq);
  97                 goto free_regions;
  98         }
  99
 100         pci_set_drvdata(pdev, channel);
 101         return 0;
 102
 103 free_regions:
 104         pci_release_regions(pdev);
 105 disable:
 106         pci_disable_device(pdev);
 107         return err;
 108 }
 109
 110 static void __devexit t3e3_remove_card(struct pci_dev *pdev)
 111 {
 112         struct channel *channel0 = pci_get_drvdata(pdev);
 113         struct card *card = channel0->card;
 114
 115         del_timer(&card->timer);
 116         if (has_two_ports(channel0->pdev)) {
 117                 t3e3_remove_channel(&card->channels[1]);
 118                 pci_dev_put(card->channels[1].pdev);
 119         }
 120         t3e3_remove_channel(channel0);
 121         kfree(card);
 122 }
 123
 124 static int __devinit t3e3_init_card(struct pci_dev *pdev, const struct pci_device_id *ent)
 125 {
 126         /* pdev points to channel #0 */
 127         struct pci_dev *pdev1 = NULL;
 128         struct card *card;
 129         int channels = 1, err;
 130
 131         if (has_two_ports(pdev)) {
 132                 while ((pdev1 = pci_get_subsys(PCI_VENDOR_ID_DEC, PCI_DEVICE_ID_DEC_21142,
 133                                                PCI_VENDOR_ID_SBE, PCI_SUBDEVICE_ID_SBE_2T3E3_P1,
 134                                                pdev1)))
 135                         if (pdev1->bus == pdev->bus &&
 136                             pdev1->devfn == pdev->devfn + 8 /* next device on the same bus */)
 137                                 break; /* found the second channel */
 138
 139                 if (!pdev1) {
 140                         printk(KERN_ERR "SBE 2T3E3" ": Can't find the second channel\n");
 141                         return -EFAULT;
 142                 }
 143                 channels = 2;
 144                 /* holds the reference for pdev1 */
 145         }
 146
 147         card = kzalloc(sizeof(struct card) + channels * sizeof(struct channel), GFP_KERNEL);
 148         if (!card) {
 149                 printk(KERN_ERR "SBE 2T3E3" ": Out of memory\n");
 150                 return -ENOBUFS;
 151         }
 152
 153         spin_lock_init(&card->bootrom_lock);
 154         card->bootrom_addr = pci_resource_start(pdev, 0);
 155
 156         err = t3e3_init_channel(&card->channels[0], pdev, card);
 157         if (err)
 158                 goto free_card;
 159
 160         if (channels == 2) {
 161                 err = t3e3_init_channel(&card->channels[1], pdev1, card);
 162                 if (err) {
 163                         t3e3_remove_channel(&card->channels[0]);
 164                         goto free_card;
 165                 }
 166         }
 167
 168         /* start LED timer */
 169         init_timer(&card->timer);
 170         card->timer.function = check_leds;
 171         card->timer.expires = jiffies + HZ / 10;
 172         card->timer.data = (unsigned long)card;
 173         add_timer(&card->timer);
 174         return 0;
 175
 176 free_card:
 177         kfree(card);
 178         return err;
 179 }
 180
 181 static struct pci_device_id t3e3_pci_tbl[] __devinitdata = {
 182         { PCI_VENDOR_ID_DEC, PCI_DEVICE_ID_DEC_21142,
 183           PCI_VENDOR_ID_SBE, PCI_SUBDEVICE_ID_SBE_T3E3, 0, 0, 0 },
 184         { PCI_VENDOR_ID_DEC, PCI_DEVICE_ID_DEC_21142,
 185           PCI_VENDOR_ID_SBE, PCI_SUBDEVICE_ID_SBE_2T3E3_P0, 0, 0, 0 },
 186         /* channel 1 will be initialized after channel 0 */
 187         { 0, }
 188 };
 189
 190 static struct pci_driver t3e3_pci_driver = {
 191         .name     = "SBE T3E3",
 192         .id_table = t3e3_pci_tbl,
 193         .probe    = t3e3_init_card,
 194         .remove   = t3e3_remove_card,
 195 };
 196
 197 static int __init t3e3_init_module(void)
 198 {
 199         return pci_register_driver(&t3e3_pci_driver);
 200 }
 201
 202 static void __exit t3e3_cleanup_module(void)
 203 {
 204         pci_unregister_driver(&t3e3_pci_driver);
 205 }
 206
 207 module_init(t3e3_init_module);
 208 module_exit(t3e3_cleanup_module);
 209 MODULE_LICENSE("GPL");
 210 MODULE_DEVICE_TABLE(pci, t3e3_pci_tbl);