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 27 static 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 */ 64 int __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 */ 103 void 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