drivers/pcmcia/cardbus.c

   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 }