cardbus.c

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/*
 * cardbus.c -- 16-bit PCMCIA core support
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * The initial developer of the original code is David A. Hinds
 * <[email protected]>.  Portions created by David A. Hinds
 * are Copyright (C) 1999 David A. Hinds.  All Rights Reserved.
 *
 * (C) 1999     David A. Hinds
 */

/*
 * Cardbus handling has been re-written to be more of a PCI bridge thing,
 * and the PCI code basically does all the resource handling.
 *
 *      Linus, Jan 2000
 */


#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>

#include <pcmcia/ss.h>


static void cardbus_config_irq_and_cls(struct pci_bus *bus, int irq)
{
    struct pci_dev *dev;

    list_for_each_entry(dev, &bus->devices, bus_list) {
        u8 irq_pin;

        /*
         * Since there is only one interrupt available to
         * CardBus devices, all devices downstream of this
         * device must be using this IRQ.
         */
        pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &irq_pin);
        if (irq_pin) {
            dev->irq = irq;
            pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
        }

        /*
         * Some controllers transfer very slowly with 0 CLS.
         * Configure it.  This may fail as CLS configuration
         * is mandatory only for MWI.
         */
        pci_set_cacheline_size(dev);

        if (dev->subordinate)
            cardbus_config_irq_and_cls(dev->subordinate, irq);
    }
}

int __ref cb_alloc(struct pcmcia_socket *s)
{
    struct pci_bus *bus = s->cb_dev->subordinate;
    struct pci_dev *dev;
    unsigned int max, pass;

    s->functions = pci_scan_slot(bus, PCI_DEVFN(0, 0));
    pci_fixup_cardbus(bus);

    max = bus->busn_res.start;
    for (pass = 0; pass < 2; pass++)
        list_for_each_entry(dev, &bus->devices, bus_list)
            if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
                dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
                max = pci_scan_bridge(bus, dev, max, pass);

    /*
     * Size all resources below the CardBus controller.
     */
    pci_bus_size_bridges(bus);
    pci_bus_assign_resources(bus);
    cardbus_config_irq_and_cls(bus, s->pci_irq);

    /* socket specific tune function */
    if (s->tune_bridge)
        s->tune_bridge(s, bus);

    pci_enable_bridges(bus);
    pci_bus_add_devices(bus);

    return 0;
}

void cb_free(struct pcmcia_socket *s)
{
    struct pci_dev *bridge, *dev, *tmp;
    struct pci_bus *bus;

    bridge = s->cb_dev;
    if (!bridge)
        return;

    bus = bridge->subordinate;
    if (!bus)
        return;

    list_for_each_entry_safe(dev, tmp, &bus->devices, bus_list)
        pci_stop_and_remove_bus_device(dev);
}