211 lines
5.3 KiB
C
211 lines
5.3 KiB
C
/*
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* SBE 2T3E3 synchronous serial card driver for Linux
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*
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* Copyright (C) 2009-2010 Krzysztof Halasa <khc@pm.waw.pl>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of version 2 of the GNU General Public License
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* as published by the Free Software Foundation.
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*
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* This code is based on a driver written by SBE Inc.
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*/
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/delay.h>
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#include <linux/netdevice.h>
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#include <linux/pci.h>
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#include <linux/hdlc.h>
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#include <linux/if_arp.h>
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#include <linux/interrupt.h>
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#include "2t3e3.h"
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static void check_leds(unsigned long arg)
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{
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struct card *card = (struct card *)arg;
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struct channel *channel0 = &card->channels[0];
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static int blinker;
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update_led(channel0, ++blinker);
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if (has_two_ports(channel0->pdev))
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update_led(&card->channels[1], blinker);
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card->timer.expires = jiffies + HZ / 10;
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add_timer(&card->timer);
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}
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static void t3e3_remove_channel(struct channel *channel)
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{
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struct pci_dev *pdev = channel->pdev;
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struct net_device *dev = channel->dev;
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/* system hangs if board asserts irq while module is unloaded */
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cpld_stop_intr(channel);
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free_irq(dev->irq, dev);
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dc_drop_descriptor_list(channel);
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unregister_hdlc_device(dev);
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free_netdev(dev);
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pci_release_regions(pdev);
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pci_disable_device(pdev);
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pci_set_drvdata(pdev, NULL);
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}
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static int __devinit t3e3_init_channel(struct channel *channel, struct pci_dev *pdev, struct card *card)
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{
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struct net_device *dev;
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unsigned int val;
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int err;
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err = pci_enable_device(pdev);
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if (err)
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return err;
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err = pci_request_regions(pdev, "SBE 2T3E3");
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if (err)
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goto disable;
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dev = alloc_hdlcdev(channel);
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if (!dev) {
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printk(KERN_ERR "SBE 2T3E3" ": Out of memory\n");
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goto free_regions;
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}
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t3e3_sc_init(channel);
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dev_to_priv(dev) = channel;
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channel->pdev = pdev;
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channel->dev = dev;
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channel->card = card;
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channel->addr = pci_resource_start(pdev, 0);
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if (pdev->subsystem_device == PCI_SUBDEVICE_ID_SBE_2T3E3_P1)
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channel->h.slot = 1;
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else
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channel->h.slot = 0;
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if (setup_device(dev, channel))
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goto free_regions;
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pci_read_config_dword(channel->pdev, 0x40, &val); /* mask sleep mode */
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pci_write_config_dword(channel->pdev, 0x40, val & 0x3FFFFFFF);
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pci_read_config_byte(channel->pdev, PCI_CACHE_LINE_SIZE, &channel->h.cache_size);
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pci_read_config_dword(channel->pdev, PCI_COMMAND, &channel->h.command);
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t3e3_init(channel);
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if (request_irq(dev->irq, &t3e3_intr, IRQF_SHARED, dev->name, dev)) {
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printk(KERN_WARNING "%s: could not get irq: %d\n", dev->name, dev->irq);
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goto free_regions;
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}
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pci_set_drvdata(pdev, channel);
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return 0;
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free_regions:
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pci_release_regions(pdev);
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disable:
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pci_disable_device(pdev);
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return err;
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}
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static void __devexit t3e3_remove_card(struct pci_dev *pdev)
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{
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struct channel *channel0 = pci_get_drvdata(pdev);
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struct card *card = channel0->card;
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del_timer(&card->timer);
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if (has_two_ports(channel0->pdev)) {
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t3e3_remove_channel(&card->channels[1]);
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pci_dev_put(card->channels[1].pdev);
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}
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t3e3_remove_channel(channel0);
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kfree(card);
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}
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static int __devinit t3e3_init_card(struct pci_dev *pdev, const struct pci_device_id *ent)
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{
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/* pdev points to channel #0 */
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struct pci_dev *pdev1 = NULL;
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struct card *card;
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int channels = 1, err;
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if (has_two_ports(pdev)) {
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while ((pdev1 = pci_get_subsys(PCI_VENDOR_ID_DEC, PCI_DEVICE_ID_DEC_21142,
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PCI_VENDOR_ID_SBE, PCI_SUBDEVICE_ID_SBE_2T3E3_P1,
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pdev1)))
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if (pdev1->bus == pdev->bus &&
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pdev1->devfn == pdev->devfn + 8 /* next device on the same bus */)
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break; /* found the second channel */
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if (!pdev1) {
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printk(KERN_ERR "SBE 2T3E3" ": Can't find the second channel\n");
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return -EFAULT;
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}
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channels = 2;
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/* holds the reference for pdev1 */
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}
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card = kzalloc(sizeof(struct card) + channels * sizeof(struct channel), GFP_KERNEL);
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if (!card) {
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printk(KERN_ERR "SBE 2T3E3" ": Out of memory\n");
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return -ENOBUFS;
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}
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spin_lock_init(&card->bootrom_lock);
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card->bootrom_addr = pci_resource_start(pdev, 0);
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err = t3e3_init_channel(&card->channels[0], pdev, card);
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if (err)
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goto free_card;
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if (channels == 2) {
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err = t3e3_init_channel(&card->channels[1], pdev1, card);
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if (err) {
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t3e3_remove_channel(&card->channels[0]);
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goto free_card;
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}
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}
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/* start LED timer */
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init_timer(&card->timer);
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card->timer.function = check_leds;
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card->timer.expires = jiffies + HZ / 10;
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card->timer.data = (unsigned long)card;
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add_timer(&card->timer);
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return 0;
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free_card:
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kfree(card);
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return err;
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}
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static struct pci_device_id t3e3_pci_tbl[] __devinitdata = {
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{ PCI_VENDOR_ID_DEC, PCI_DEVICE_ID_DEC_21142,
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PCI_VENDOR_ID_SBE, PCI_SUBDEVICE_ID_SBE_T3E3, 0, 0, 0 },
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{ PCI_VENDOR_ID_DEC, PCI_DEVICE_ID_DEC_21142,
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PCI_VENDOR_ID_SBE, PCI_SUBDEVICE_ID_SBE_2T3E3_P0, 0, 0, 0 },
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/* channel 1 will be initialized after channel 0 */
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{ 0, }
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};
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static struct pci_driver t3e3_pci_driver = {
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.name = "SBE T3E3",
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.id_table = t3e3_pci_tbl,
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.probe = t3e3_init_card,
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.remove = t3e3_remove_card,
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};
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static int __init t3e3_init_module(void)
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{
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return pci_register_driver(&t3e3_pci_driver);
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}
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static void __exit t3e3_cleanup_module(void)
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{
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pci_unregister_driver(&t3e3_pci_driver);
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}
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module_init(t3e3_init_module);
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module_exit(t3e3_cleanup_module);
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MODULE_LICENSE("GPL");
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MODULE_DEVICE_TABLE(pci, t3e3_pci_tbl);
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