// SPDX-License-Identifier: GPL-2.0-only

  /*
   * rsrc_iodyn.c -- Resource management routines for MEM-static sockets.
   *

   * The initial developer of the original code is David A. Hinds
   * <dahinds@users.sourceforge.net>.  Portions created by David A. Hinds
   * are Copyright (C) 1999 David A. Hinds.  All Rights Reserved.
   *
   * (C) 1999		David A. Hinds
   */

  #include <linux/slab.h>

  #include <linux/module.h>
  #include <linux/kernel.h>

  #include <pcmcia/ss.h>

  #include <pcmcia/cistpl.h>
  #include "cs_internal.h"
  
  
  struct pcmcia_align_data {
  	unsigned long	mask;
  	unsigned long	offset;
  };
  
  static resource_size_t pcmcia_align(void *align_data,
  				const struct resource *res,
  				resource_size_t size, resource_size_t align)
  {
  	struct pcmcia_align_data *data = align_data;
  	resource_size_t start;
  
  	start = (res->start & ~data->mask) + data->offset;
  	if (start < res->start)
  		start += data->mask + 1;
  
  #ifdef CONFIG_X86
  	if (res->flags & IORESOURCE_IO) {
  		if (start & 0x300)
  			start = (start + 0x3ff) & ~0x3ff;
  	}
  #endif
  
  #ifdef CONFIG_M68K
  	if (res->flags & IORESOURCE_IO) {
  		if ((res->start + size - 1) >= 1024)
  			start = res->end;
  	}
  #endif
  
  	return start;
  }

  static struct resource *__iodyn_find_io_region(struct pcmcia_socket *s,
  					unsigned long base, int num,
  					unsigned long align)

  {
  	struct resource *res = pcmcia_make_resource(0, num, IORESOURCE_IO,
  						dev_name(&s->dev));
  	struct pcmcia_align_data data;
  	unsigned long min = base;
  	int ret;

  	data.mask = align - 1;
  	data.offset = base & data.mask;
  
  #ifdef CONFIG_PCI
  	if (s->cb_dev) {
  		ret = pci_bus_alloc_resource(s->cb_dev->bus, res, num, 1,
  					     min, 0, pcmcia_align, &data);
  	} else
  #endif
  		ret = allocate_resource(&ioport_resource, res, num, min, ~0UL,
  					1, pcmcia_align, &data);
  
  	if (ret != 0) {
  		kfree(res);
  		res = NULL;
  	}
  	return res;
  }

  static int iodyn_find_io(struct pcmcia_socket *s, unsigned int attr,
  			unsigned int *base, unsigned int num,

  			unsigned int align, struct resource **parent)

  {
  	int i, ret = 0;
  
  	/* Check for an already-allocated window that must conflict with
  	 * what was asked for.  It is a hack because it does not catch all
  	 * potential conflicts, just the most obvious ones.
  	 */
  	for (i = 0; i < MAX_IO_WIN; i++) {
  		if (!s->io[i].res)
  			continue;
  
  		if (!*base)
  			continue;
  
  		if ((s->io[i].res->start & (align-1)) == *base)
  			return -EBUSY;
  	}
  
  	for (i = 0; i < MAX_IO_WIN; i++) {
  		struct resource *res = s->io[i].res;
  		unsigned int try;
  
  		if (res && (res->flags & IORESOURCE_BITS) !=
  			(attr & IORESOURCE_BITS))
  			continue;
  
  		if (!res) {
  			if (align == 0)
  				align = 0x10000;
  
  			res = s->io[i].res = __iodyn_find_io_region(s, *base,
  								num, align);
  			if (!res)
  				return -EINVAL;
  
  			*base = res->start;
  			s->io[i].res->flags =
  				((res->flags & ~IORESOURCE_BITS) |
  					(attr & IORESOURCE_BITS));
  			s->io[i].InUse = num;

  			*parent = res;

  			return 0;
  		}
  
  		/* Try to extend top of window */
  		try = res->end + 1;
  		if ((*base == 0) || (*base == try)) {
  			if (adjust_resource(s->io[i].res, res->start,

  					    resource_size(res) + num))

  				continue;
  			*base = try;
  			s->io[i].InUse += num;

  			*parent = res;

  			return 0;
  		}
  
  		/* Try to extend bottom of window */
  		try = res->start - num;
  		if ((*base == 0) || (*base == try)) {
  			if (adjust_resource(s->io[i].res,

  					    res->start - num,
  					    resource_size(res) + num))

  				continue;
  			*base = try;
  			s->io[i].InUse += num;

  			*parent = res;

  			return 0;
  		}
  	}
  
  	return -EINVAL;
  }

  struct pccard_resource_ops pccard_iodyn_ops = {
  	.validate_mem = NULL,

  	.find_io = iodyn_find_io,

  	.find_mem = NULL,

  	.init = static_init,
  	.exit = NULL,
  };
  EXPORT_SYMBOL(pccard_iodyn_ops);