LXR linux/drivers/pcmcia/cardbus.c

   1/*
   2 * cardbus.c -- 16-bit PCMCIA core support
   3 *
   4 * This program is free software; you can redistribute it and/or modify
   5 * it under the terms of the GNU General Public License version 2 as
   6 * published by the Free Software Foundation.
   7 *
   8 * The initial developer of the original code is David A. Hinds
   9 * <dahinds@users.sourceforge.net>.  Portions created by David A. Hinds
  10 * are Copyright (C) 1999 David A. Hinds.  All Rights Reserved.
  11 *
  12 * (C) 1999             David A. Hinds
  13 */
  14
  15/*
  16 * Cardbus handling has been re-written to be more of a PCI bridge thing,
  17 * and the PCI code basically does all the resource handling.
  18 *
  19 *              Linus, Jan 2000
  20 */
  21
  22
  23#include <linux/kernel.h>
  24#include <linux/module.h>
  25#include <linux/pci.h>
  26
  27#include <pcmcia/ss.h>
  28
  29
  30static void cardbus_config_irq_and_cls(struct pci_bus *bus, int irq)
  31{
  32        struct pci_dev *dev;
  33
  34        list_for_each_entry(dev, &bus->devices, bus_list) {
  35                u8 irq_pin;
  36
  37                /*
  38                 * Since there is only one interrupt available to
  39                 * CardBus devices, all devices downstream of this
  40                 * device must be using this IRQ.
  41                 */
  42                pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &irq_pin);
  43                if (irq_pin) {
  44                        dev->irq = irq;
  45                        pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
  46                }
  47
  48                /*
  49                 * Some controllers transfer very slowly with 0 CLS.
  50                 * Configure it.  This may fail as CLS configuration
  51                 * is mandatory only for MWI.
  52                 */
  53                pci_set_cacheline_size(dev);
  54
  55                if (dev->subordinate)
  56                        cardbus_config_irq_and_cls(dev->subordinate, irq);
  57        }
  58}
  59
  60/**
  61 * cb_alloc() - add CardBus device
  62 * @s:          the pcmcia_socket where the CardBus device is located
  63 *
  64 * cb_alloc() allocates the kernel data structures for a Cardbus device
  65 * and handles the lowest level PCI device setup issues.
  66 */
  67int __ref cb_alloc(struct pcmcia_socket *s)
  68{
  69        struct pci_bus *bus = s->cb_dev->subordinate;
  70        struct pci_dev *dev;
  71        unsigned int max, pass;
  72
  73        s->functions = pci_scan_slot(bus, PCI_DEVFN(0, 0));
  74        pci_fixup_cardbus(bus);
  75
  76        max = bus->busn_res.start;
  77        for (pass = 0; pass < 2; pass++)
  78                list_for_each_entry(dev, &bus->devices, bus_list)
  79                        if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
  80                            dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
  81                                max = pci_scan_bridge(bus, dev, max, pass);
  82
  83        /*
  84         * Size all resources below the CardBus controller.
  85         */
  86        pci_bus_size_bridges(bus);
  87        pci_bus_assign_resources(bus);
  88        cardbus_config_irq_and_cls(bus, s->pci_irq);
  89
  90        /* socket specific tune function */
  91        if (s->tune_bridge)
  92                s->tune_bridge(s, bus);
  93
  94        pci_enable_bridges(bus);
  95        pci_bus_add_devices(bus);
  96
  97        return 0;
  98}
  99
 100/**
 101 * cb_free() - remove CardBus device
 102 * @s:          the pcmcia_socket where the CardBus device was located
 103 *
 104 * cb_free() handles the lowest level PCI device cleanup.
 105 */
 106void cb_free(struct pcmcia_socket *s)
 107{
 108        struct pci_dev *bridge, *dev, *tmp;
 109        struct pci_bus *bus;
 110
 111        bridge = s->cb_dev;
 112        if (!bridge)
 113                return;
 114
 115        bus = bridge->subordinate;
 116        if (!bus)
 117                return;
 118
 119        list_for_each_entry_safe(dev, tmp, &bus->devices, bus_list)
 120                pci_stop_and_remove_bus_device(dev);
 121}
 122