// SPDX-License-Identifier: GPL-2.0-only /* * cardbus.c -- 16-bit PCMCIA core support * * The initial developer of the original code is David A. Hinds * <dahinds@users.sourceforge.net>. 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> #include <pcmcia/cistpl.h> #include "cs_internal.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); } } /** * cb_alloc() - add CardBus device * @s: the pcmcia_socket where the CardBus device is located * * cb_alloc() allocates the kernel data structures for a Cardbus device * and handles the lowest level PCI device setup issues. */ int __ref cb_alloc(struct pcmcia_socket *s) { struct pci_bus *bus = s->cb_dev->subordinate; struct pci_dev *dev; unsigned int max, pass; pci_lock_rescan_remove(); 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++) for_each_pci_bridge(dev, bus) 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_bus_add_devices(bus); pci_unlock_rescan_remove(); return 0; } /** * cb_free() - remove CardBus device * @s: the pcmcia_socket where the CardBus device was located * * cb_free() handles the lowest level PCI device cleanup. */ 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; pci_lock_rescan_remove(); list_for_each_entry_safe(dev, tmp, &bus->devices, bus_list) pci_stop_and_remove_bus_device(dev); pci_unlock_rescan_remove(); }