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/*
**********************************************************************
* osutils.c - OS Services layer for emu10k1 driver
* Copyright 1999, 2000 Creative Labs, Inc.
*
**********************************************************************
*
* Date Author Summary of changes
* ---- ------ ------------------
* October 20, 1999 Bertrand Lee base code release
* November 2, 1999 Alan Cox cleaned up
*
**********************************************************************
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this program; if not, write to the Free
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139,
* USA.
*
**********************************************************************
*/
#include "hwaccess.h"
struct memhandle *emu10k1_alloc_memphysical(u32 size)
{
struct memhandle *handle;
u32 reqpage, order;
if ((handle = (struct memhandle *) kmalloc(sizeof(struct memhandle), GFP_KERNEL)) == NULL)
return handle;
DPD(3, "kmalloc: [%p]\n", handle);
order = 0;
reqpage = size / PAGE_SIZE;
if (size % PAGE_SIZE)
reqpage++;
if (reqpage != 0) {
reqpage--;
while (reqpage > 0) {
reqpage >>= 1;
order++;
}
}
if ((handle->virtaddx = (void *) __get_free_pages(GFP_KERNEL, order)) == NULL) {
kfree(handle);
DPD(3, "kfree: [%p]\n", handle);
return (void *) NULL;
}
/* in linux, we can directly access physical address, don't need to do
* phys_to_virt.
* In linux kernel 2.0.36, virt_to_bus does nothing, get_free_pages
* returns physical address. But in kernel 2.2.1 upwards,
* get_free_pages returns virtual address, we need to convert it
* to physical address. Then this physical address can be used to
* program hardware registers. */
handle->busaddx = virt_to_bus(handle->virtaddx);
handle->order = order;
DPD(3, "__get_free_pages: [%p] %lx\n", handle->virtaddx, handle->busaddx);
return handle;
}
void emu10k1_free_memphysical(struct memhandle *handle)
{
free_pages((unsigned long) handle->virtaddx, handle->order);
kfree(handle);
DPD(3, "free_pages: [%p]\n", handle->virtaddx);
DPD(3, "kfree: [%p]\n", handle);
return;
}
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