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 #include <pcmcia/cistpl.h>
  26
  27 #include "cs_internal.h"
  28
  29 static 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 to
  38                  * CardBus devices, all devices downstream of this
  39                  * 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 configuration
  50                  * 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 device
  61  * @s:          the pcmcia_socket where the CardBus device is located
  62  *
  63  * cb_alloc() allocates the kernel data structures for a Cardbus device
  64  * and handles the lowest level PCI device setup issues.
  65  */
  66 int __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 device
 101  * @s:          the pcmcia_socket where the CardBus device was located
 102  *
 103  * cb_free() handles the lowest level PCI device cleanup.
 104  */
 105 void 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 }