linux/drivers/pcmcia/cardbus.c
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   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#include <pcmcia/cistpl.h>
  26
  27#include "cs_internal.h"
  28
  29static void cardbus_config_irq_and_cls(struct pci_bus *bus, int irq)
  30{
  31        struct pci_dev *dev;
  32
  33        list_for_each_entry(dev, &bus->devices, bus_list) {
  34                u8 irq_pin;
  35
  36                /*
  37                 * Since there is only one interrupt available to
  38                 * CardBus devices, all devices downstream of this
  39                 * device must be using this IRQ.
  40                 */
  41                pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &irq_pin);
  42                if (irq_pin) {
  43                        dev->irq = irq;
  44                        pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
  45                }
  46
  47                /*
  48                 * Some controllers transfer very slowly with 0 CLS.
  49                 * Configure it.  This may fail as CLS configuration
  50                 * is mandatory only for MWI.
  51                 */
  52                pci_set_cacheline_size(dev);
  53
  54                if (dev->subordinate)
  55                        cardbus_config_irq_and_cls(dev->subordinate, irq);
  56        }
  57}
  58
  59/**
  60 * cb_alloc() - add CardBus device
  61 * @s:          the pcmcia_socket where the CardBus device is located
  62 *
  63 * cb_alloc() allocates the kernel data structures for a Cardbus device
  64 * and handles the lowest level PCI device setup issues.
  65 */
  66int __ref cb_alloc(struct pcmcia_socket *s)
  67{
  68        struct pci_bus *bus = s->cb_dev->subordinate;
  69        struct pci_dev *dev;
  70        unsigned int max, pass;
  71
  72        pci_lock_rescan_remove();
  73
  74        s->functions = pci_scan_slot(bus, PCI_DEVFN(0, 0));
  75        pci_fixup_cardbus(bus);
  76
  77        max = bus->busn_res.start;
  78        for (pass = 0; pass < 2; pass++)
  79                for_each_pci_bridge(dev, bus)
  80                        max = pci_scan_bridge(bus, dev, max, pass);
  81
  82        /*
  83         * Size all resources below the CardBus controller.
  84         */
  85        pci_bus_size_bridges(bus);
  86        pci_bus_assign_resources(bus);
  87        cardbus_config_irq_and_cls(bus, s->pci_irq);
  88
  89        /* socket specific tune function */
  90        if (s->tune_bridge)
  91                s->tune_bridge(s, bus);
  92
  93        pci_bus_add_devices(bus);
  94
  95        pci_unlock_rescan_remove();
  96        return 0;
  97}
  98
  99/**
 100 * cb_free() - remove CardBus device
 101 * @s:          the pcmcia_socket where the CardBus device was located
 102 *
 103 * cb_free() handles the lowest level PCI device cleanup.
 104 */
 105void cb_free(struct pcmcia_socket *s)
 106{
 107        struct pci_dev *bridge, *dev, *tmp;
 108        struct pci_bus *bus;
 109
 110        bridge = s->cb_dev;
 111        if (!bridge)
 112                return;
 113
 114        bus = bridge->subordinate;
 115        if (!bus)
 116                return;
 117
 118        pci_lock_rescan_remove();
 119
 120        list_for_each_entry_safe(dev, tmp, &bus->devices, bus_list)
 121                pci_stop_and_remove_bus_device(dev);
 122
 123        pci_unlock_rescan_remove();
 124}
 125