LXR linux/drivers/pcmcia/rsrc

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * rsrc_iodyn.c -- Resource management routines for MEM-static sockets.
   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#include <linux/slab.h>
  13#include <linux/module.h>
  14#include <linux/kernel.h>
  15
  16#include <pcmcia/ss.h>
  17#include <pcmcia/cistpl.h>
  18#include "cs_internal.h"
  19
  20
  21struct pcmcia_align_data {
  22        unsigned long   mask;
  23        unsigned long   offset;
  24};
  25
  26static resource_size_t pcmcia_align(void *align_data,
  27                                const struct resource *res,
  28                                resource_size_t size, resource_size_t align)
  29{
  30        struct pcmcia_align_data *data = align_data;
  31        resource_size_t start;
  32
  33        start = (res->start & ~data->mask) + data->offset;
  34        if (start < res->start)
  35                start += data->mask + 1;
  36
  37#ifdef CONFIG_X86
  38        if (res->flags & IORESOURCE_IO) {
  39                if (start & 0x300)
  40                        start = (start + 0x3ff) & ~0x3ff;
  41        }
  42#endif
  43
  44#ifdef CONFIG_M68K
  45        if (res->flags & IORESOURCE_IO) {
  46                if ((res->start + size - 1) >= 1024)
  47                        start = res->end;
  48        }
  49#endif
  50
  51        return start;
  52}
  53
  54
  55static struct resource *__iodyn_find_io_region(struct pcmcia_socket *s,
  56                                        unsigned long base, int num,
  57                                        unsigned long align)
  58{
  59        struct resource *res = pcmcia_make_resource(0, num, IORESOURCE_IO,
  60                                                dev_name(&s->dev));
  61        struct pcmcia_align_data data;
  62        unsigned long min = base;
  63        int ret;
  64
  65        data.mask = align - 1;
  66        data.offset = base & data.mask;
  67
  68#ifdef CONFIG_PCI
  69        if (s->cb_dev) {
  70                ret = pci_bus_alloc_resource(s->cb_dev->bus, res, num, 1,
  71                                             min, 0, pcmcia_align, &data);
  72        } else
  73#endif
  74                ret = allocate_resource(&ioport_resource, res, num, min, ~0UL,
  75                                        1, pcmcia_align, &data);
  76
  77        if (ret != 0) {
  78                kfree(res);
  79                res = NULL;
  80        }
  81        return res;
  82}
  83
  84static int iodyn_find_io(struct pcmcia_socket *s, unsigned int attr,
  85                        unsigned int *base, unsigned int num,
  86                        unsigned int align, struct resource **parent)
  87{
  88        int i, ret = 0;
  89
  90        /* Check for an already-allocated window that must conflict with
  91         * what was asked for.  It is a hack because it does not catch all
  92         * potential conflicts, just the most obvious ones.
  93         */
  94        for (i = 0; i < MAX_IO_WIN; i++) {
  95                if (!s->io[i].res)
  96                        continue;
  97
  98                if (!*base)
  99                        continue;
 100
 101                if ((s->io[i].res->start & (align-1)) == *base)
 102                        return -EBUSY;
 103        }
 104
 105        for (i = 0; i < MAX_IO_WIN; i++) {
 106                struct resource *res = s->io[i].res;
 107                unsigned int try;
 108
 109                if (res && (res->flags & IORESOURCE_BITS) !=
 110                        (attr & IORESOURCE_BITS))
 111                        continue;
 112
 113                if (!res) {
 114                        if (align == 0)
 115                                align = 0x10000;
 116
 117                        res = s->io[i].res = __iodyn_find_io_region(s, *base,
 118                                                                num, align);
 119                        if (!res)
 120                                return -EINVAL;
 121
 122                        *base = res->start;
 123                        s->io[i].res->flags =
 124                                ((res->flags & ~IORESOURCE_BITS) |
 125                                        (attr & IORESOURCE_BITS));
 126                        s->io[i].InUse = num;
 127                        *parent = res;
 128                        return 0;
 129                }
 130
 131                /* Try to extend top of window */
 132                try = res->end + 1;
 133                if ((*base == 0) || (*base == try)) {
 134                        if (adjust_resource(s->io[i].res, res->start,
 135                                            resource_size(res) + num))
 136                                continue;
 137                        *base = try;
 138                        s->io[i].InUse += num;
 139                        *parent = res;
 140                        return 0;
 141                }
 142
 143                /* Try to extend bottom of window */
 144                try = res->start - num;
 145                if ((*base == 0) || (*base == try)) {
 146                        if (adjust_resource(s->io[i].res,
 147                                            res->start - num,
 148                                            resource_size(res) + num))
 149                                continue;
 150                        *base = try;
 151                        s->io[i].InUse += num;
 152                        *parent = res;
 153                        return 0;
 154                }
 155        }
 156
 157        return -EINVAL;
 158}
 159
 160
 161struct pccard_resource_ops pccard_iodyn_ops = {
 162        .validate_mem = NULL,
 163        .find_io = iodyn_find_io,
 164        .find_mem = NULL,
 165        .init = static_init,
 166        .exit = NULL,
 167};
 168EXPORT_SYMBOL(pccard_iodyn_ops);
 169