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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * cardbus.c -- 16-bit PCMCIA core support4 *5 * The initial developer of the original code is David A. Hinds6 * <dahinds@users.sourceforge.net>. Portions created by David A. Hinds7 * are Copyright (C) 1999 David A. Hinds. All Rights Reserved.8 *9 * (C) 1999 David A. Hinds10 */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 200017 */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 to38 * CardBus devices, all devices downstream of this39 * 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 configuration50 * 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 device61 * @s: the pcmcia_socket where the CardBus device is located62 *63 * cb_alloc() allocates the kernel data structures for a Cardbus device64 * 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 device101 * @s: the pcmcia_socket where the CardBus device was located102 *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