LXR linux/drivers/pcmcia/cardbus.c

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * cardbus.c -- 16-bit PCMCIA core support
   4 *
   5 * The initial developer of the original code is David A. Hinds
   6 * <dahinds@users.sourceforge.net>.  Portions created by David A. Hinds
   7 * are Copyright (C) 1999 David A. Hinds.  All Rights Reserved.
   8 *
   9 * (C) 1999             David A. Hinds
  10 */
  11
  12/*
  13 * Cardbus handling has been re-written to be more of a PCI bridge thing,
  14 * and the PCI code basically does all the resource handling.
  15 *
  16 *              Linus, Jan 2000
  17 */
  18
  19
  20#include <linux/kernel.h>
  21#include <linux/module.h>
  22#include <linux/pci.h>
  23
  24#include <pcmcia/ss.h>
  25
  26
  27static void cardbus_config_irq_and_cls(struct pci_bus *bus, int irq)
  28{
  29        struct pci_dev *dev;
  30
  31        list_for_each_entry(dev, &bus->devices, bus_list) {
  32                u8 irq_pin;
  33
  34                /*
  35                 * Since there is only one interrupt available to
  36                 * CardBus devices, all devices downstream of this
  37                 * device must be using this IRQ.
  38                 */
  39                pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &irq_pin);
  40                if (irq_pin) {
  41                        dev->irq = irq;
  42                        pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
  43                }
  44
  45                /*
  46                 * Some controllers transfer very slowly with 0 CLS.
  47                 * Configure it.  This may fail as CLS configuration
  48                 * is mandatory only for MWI.
  49                 */
  50                pci_set_cacheline_size(dev);
  51
  52                if (dev->subordinate)
  53                        cardbus_config_irq_and_cls(dev->subordinate, irq);
  54        }
  55}
  56
  57/**
  58 * cb_alloc() - add CardBus device
  59 * @s:          the pcmcia_socket where the CardBus device is located
  60 *
  61 * cb_alloc() allocates the kernel data structures for a Cardbus device
  62 * and handles the lowest level PCI device setup issues.
  63 */
  64int __ref cb_alloc(struct pcmcia_socket *s)
  65{
  66        struct pci_bus *bus = s->cb_dev->subordinate;
  67        struct pci_dev *dev;
  68        unsigned int max, pass;
  69
  70        pci_lock_rescan_remove();
  71
  72        s->functions = pci_scan_slot(bus, PCI_DEVFN(0, 0));
  73        pci_fixup_cardbus(bus);
  74
  75        max = bus->busn_res.start;
  76        for (pass = 0; pass < 2; pass++)
  77                for_each_pci_bridge(dev, bus)
  78                        max = pci_scan_bridge(bus, dev, max, pass);
  79
  80        /*
  81         * Size all resources below the CardBus controller.
  82         */
  83        pci_bus_size_bridges(bus);
  84        pci_bus_assign_resources(bus);
  85        cardbus_config_irq_and_cls(bus, s->pci_irq);
  86
  87        /* socket specific tune function */
  88        if (s->tune_bridge)
  89                s->tune_bridge(s, bus);
  90
  91        pci_bus_add_devices(bus);
  92
  93        pci_unlock_rescan_remove();
  94        return 0;
  95}
  96
  97/**
  98 * cb_free() - remove CardBus device
  99 * @s:          the pcmcia_socket where the CardBus device was located
 100 *
 101 * cb_free() handles the lowest level PCI device cleanup.
 102 */
 103void cb_free(struct pcmcia_socket *s)
 104{
 105        struct pci_dev *bridge, *dev, *tmp;
 106        struct pci_bus *bus;
 107
 108        bridge = s->cb_dev;
 109        if (!bridge)
 110                return;
 111
 112        bus = bridge->subordinate;
 113        if (!bus)
 114                return;
 115
 116        pci_lock_rescan_remove();
 117
 118        list_for_each_entry_safe(dev, tmp, &bus->devices, bus_list)
 119                pci_stop_and_remove_bus_device(dev);
 120
 121        pci_unlock_rescan_remove();
 122}
 123