release/src-rt-6.x.4708/linux/linux-2.6.36/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
  30 static 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  */
  67 int __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->secondary;
  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  */
 106 void cb_free(struct pcmcia_socket *s)
 107 {
 108         struct pci_dev *bridge = s->cb_dev;
 109
 110         if (bridge)
 111                 pci_remove_behind_bridge(bridge);
 112 }