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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * rsrc_iodyn.c -- Resource management routines for MEM-static sockets.4 *5 * The initial developer of the original code is David A. Hinds6 * <dahinds@users.sourceforge.net>. Portions created by David A. Hinds7 * are Copyright (C) 1999 David A. Hinds. All Rights Reserved.8 *9 * (C) 1999 David A. Hinds10 */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_X8638 if (res->flags & IORESOURCE_IO) {39 if (start & 0x300)40 start = (start + 0x3ff) & ~0x3ff;41 }42#endif43 44#ifdef CONFIG_M68K45 if (res->flags & IORESOURCE_IO) {46 if ((res->start + size - 1) >= 1024)47 start = res->end;48 }49#endif50 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_PCI69 if (s->cb_dev) {70 ret = pci_bus_alloc_resource(s->cb_dev->bus, res, num, 1,71 min, 0, pcmcia_align, &data);72 } else73#endif74 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 with91 * what was asked for. It is a hack because it does not catch all92 * 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