1 /* 2 * cardbus.c -- 16-bit PCMCIA core support 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License version 2 as 6 * published by the Free Software Foundation. 7 * 8 * The initial developer of the original code is David A. Hinds 9 * <dahinds@users.sourceforge.net>. Portions created by David A. Hinds 10 * are Copyright (C) 1999 David A. Hinds. All Rights Reserved. 11 * 12 * (C) 1999 David A. Hinds 13 */ 14 15 /* 16 * Cardbus handling has been re-written to be more of a PCI bridge thing, 17 * and the PCI code basically does all the resource handling. 18 * 19 * Linus, Jan 2000 20 */ 21 22 23 #include <linux/kernel.h> 24 #include <linux/module.h> 25 #include <linux/pci.h> 26 27 #include <pcmcia/ss.h> 28 29 30 static void cardbus_config_irq_and_cls(struct pci_bus *bus, int irq) 31 { 32 struct pci_dev *dev; 33 34 list_for_each_entry(dev, &bus->devices, bus_list) { 35 u8 irq_pin; 36 37 /* 38 * Since there is only one interrupt available to 39 * CardBus devices, all devices downstream of this 40 * device must be using this IRQ. 41 */ 42 pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &irq_pin); 43 if (irq_pin) { 44 dev->irq = irq; 45 pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq); 46 } 47 48 /* 49 * Some controllers transfer very slowly with 0 CLS. 50 * Configure it. This may fail as CLS configuration 51 * is mandatory only for MWI. 52 */ 53 pci_set_cacheline_size(dev); 54 55 if (dev->subordinate) 56 cardbus_config_irq_and_cls(dev->subordinate, irq); 57 } 58 } 59 60 /** 61 * cb_alloc() - add CardBus device 62 * @s: the pcmcia_socket where the CardBus device is located 63 * 64 * cb_alloc() allocates the kernel data structures for a Cardbus device 65 * and handles the lowest level PCI device setup issues. 66 */ 67 int __ref cb_alloc(struct pcmcia_socket *s) 68 { 69 struct pci_bus *bus = s->cb_dev->subordinate; 70 struct pci_dev *dev; 71 unsigned int max, pass; 72 73 pci_lock_rescan_remove(); 74 75 s->functions = pci_scan_slot(bus, PCI_DEVFN(0, 0)); 76 pci_fixup_cardbus(bus); 77 78 max = bus->busn_res.start; 79 for (pass = 0; pass < 2; pass++) 80 for_each_pci_bridge(dev, bus) 81 max = pci_scan_bridge(bus, dev, max, pass); 82 83 /* 84 * Size all resources below the CardBus controller. 85 */ 86 pci_bus_size_bridges(bus); 87 pci_bus_assign_resources(bus); 88 cardbus_config_irq_and_cls(bus, s->pci_irq); 89 90 /* socket specific tune function */ 91 if (s->tune_bridge) 92 s->tune_bridge(s, bus); 93 94 pci_bus_add_devices(bus); 95 96 pci_unlock_rescan_remove(); 97 return 0; 98 } 99 100 /** 101 * cb_free() - remove CardBus device 102 * @s: the pcmcia_socket where the CardBus device was located 103 * 104 * cb_free() handles the lowest level PCI device cleanup. 105 */ 106 void cb_free(struct pcmcia_socket *s) 107 { 108 struct pci_dev *bridge, *dev, *tmp; 109 struct pci_bus *bus; 110 111 bridge = s->cb_dev; 112 if (!bridge) 113 return; 114 115 bus = bridge->subordinate; 116 if (!bus) 117 return; 118 119 pci_lock_rescan_remove(); 120 121 list_for_each_entry_safe(dev, tmp, &bus->devices, bus_list) 122 pci_stop_and_remove_bus_device(dev); 123 124 pci_unlock_rescan_remove(); 125 } 126