drivers/pcmcia/rsrc_mgr.c

   1 /*
   2  * rsrc_mgr.c -- Resource management routines and/or wrappers
   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 #include <linux/module.h>
  16 #include <linux/kernel.h>
  17
  18 #include <pcmcia/cs_types.h>
  19 #include <pcmcia/ss.h>
  20 #include <pcmcia/cs.h>
  21 #include <pcmcia/cistpl.h>
  22 #include "cs_internal.h"
  23
  24 static int static_init(struct pcmcia_socket *s)
  25 {
  26         unsigned long flags;
  27
  28         /* the good thing about SS_CAP_STATIC_MAP sockets is
  29          * that they don't need a resource database */
  30
  31         spin_lock_irqsave(&s->lock, flags);
  32         s->resource_setup_done = 1;
  33         spin_unlock_irqrestore(&s->lock, flags);
  34
  35         return 0;
  36 }
  37
  38
  39 struct pccard_resource_ops pccard_static_ops = {
  40         .validate_mem = NULL,
  41         .adjust_io_region = NULL,
  42         .find_io = NULL,
  43         .find_mem = NULL,
  44         .add_io = NULL,
  45         .add_mem = NULL,
  46         .init = static_init,
  47         .exit = NULL,
  48 };
  49 EXPORT_SYMBOL(pccard_static_ops);
  50
  51
  52 #ifdef CONFIG_PCCARD_IODYN
  53
  54 static struct resource *
  55 make_resource(unsigned long b, unsigned long n, int flags, char *name)
  56 {
  57         struct resource *res = kzalloc(sizeof(*res), GFP_KERNEL);
  58
  59         if (res) {
  60                 res->name = name;
  61                 res->start = b;
  62                 res->end = b + n - 1;
  63                 res->flags = flags;
  64         }
  65         return res;
  66 }
  67
  68 struct pcmcia_align_data {
  69         unsigned long   mask;
  70         unsigned long   offset;
  71 };
  72
  73 static void pcmcia_align(void *align_data, struct resource *res,
  74                         unsigned long size, unsigned long align)
  75 {
  76         struct pcmcia_align_data *data = align_data;
  77         unsigned long start;
  78
  79         start = (res->start & ~data->mask) + data->offset;
  80         if (start < res->start)
  81                 start += data->mask + 1;
  82         res->start = start;
  83
  84 #ifdef CONFIG_X86
  85         if (res->flags & IORESOURCE_IO) {
  86                 if (start & 0x300) {
  87                         start = (start + 0x3ff) & ~0x3ff;
  88                         res->start = start;
  89                 }
  90         }
  91 #endif
  92
  93 #ifdef CONFIG_M68K
  94         if (res->flags & IORESOURCE_IO) {
  95                 if ((res->start + size - 1) >= 1024)
  96                         res->start = res->end;
  97         }
  98 #endif
  99 }
 100
 101
 102 static int iodyn_adjust_io_region(struct resource *res, unsigned long r_start,
 103                                       unsigned long r_end, struct pcmcia_socket *s)
 104 {
 105         return adjust_resource(res, r_start, r_end - r_start + 1);
 106 }
 107
 108
 109 static struct resource *iodyn_find_io_region(unsigned long base, int num,
 110                 unsigned long align, struct pcmcia_socket *s)
 111 {
 112         struct resource *res = make_resource(0, num, IORESOURCE_IO,
 113                                              dev_name(&s->dev));
 114         struct pcmcia_align_data data;
 115         unsigned long min = base;
 116         int ret;
 117
 118         if (align == 0)
 119                 align = 0x10000;
 120
 121         data.mask = align - 1;
 122         data.offset = base & data.mask;
 123
 124 #ifdef CONFIG_PCI
 125         if (s->cb_dev) {
 126                 ret = pci_bus_alloc_resource(s->cb_dev->bus, res, num, 1,
 127                                              min, 0, pcmcia_align, &data);
 128         } else
 129 #endif
 130                 ret = allocate_resource(&ioport_resource, res, num, min, ~0UL,
 131                                         1, pcmcia_align, &data);
 132
 133         if (ret != 0) {
 134                 kfree(res);
 135                 res = NULL;
 136         }
 137         return res;
 138 }
 139
 140 struct pccard_resource_ops pccard_iodyn_ops = {
 141         .validate_mem = NULL,
 142         .adjust_io_region = iodyn_adjust_io_region,
 143         .find_io = iodyn_find_io_region,
 144         .find_mem = NULL,
 145         .add_io = NULL,
 146         .add_mem = NULL,
 147         .init = static_init,
 148         .exit = NULL,
 149 };
 150 EXPORT_SYMBOL(pccard_iodyn_ops);
 151
 152 #endif /* CONFIG_PCCARD_IODYN */