| 1 | /* $Id: osutils.c,v 1.1 2000/04/23 14:55:45 ktk Exp $ */
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| 2 |
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| 3 |
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| 4 | /*
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| 5 | **********************************************************************
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| 6 | * osutils.c - OS Services layer for emu10k1 driver
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| 7 | * Copyright 1999, 2000 Creative Labs, Inc.
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| 8 | *
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| 9 | **********************************************************************
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| 10 | *
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| 11 | * Date Author Summary of changes
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| 12 | * ---- ------ ------------------
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| 13 | * October 20, 1999 Bertrand Lee base code release
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| 14 | * November 2, 1999 Alan Cox cleaned up
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| 15 | *
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| 16 | **********************************************************************
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| 17 | *
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| 18 | * This program is free software; you can redistribute it and/or
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| 19 | * modify it under the terms of the GNU General Public License as
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| 20 | * published by the Free Software Foundation; either version 2 of
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| 21 | * the License, or (at your option) any later version.
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| 22 | *
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| 23 | * This program is distributed in the hope that it will be useful,
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| 24 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 25 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 26 | * GNU General Public License for more details.
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| 27 | *
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| 28 | * You should have received a copy of the GNU General Public
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| 29 | * License along with this program; if not, write to the Free
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| 30 | * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139,
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| 31 | * USA.
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| 32 | *
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| 33 | **********************************************************************
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| 34 | */
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| 35 |
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| 36 | #include "hwaccess.h"
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| 37 |
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| 38 | struct memhandle *emu10k1_alloc_memphysical(u32 size)
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| 39 | {
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| 40 | struct memhandle *handle;
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| 41 | u32 reqpage, order;
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| 42 |
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| 43 | if ((handle = (struct memhandle *) kmalloc(sizeof(struct memhandle), GFP_KERNEL)) == NULL)
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| 44 | return handle;
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| 45 |
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| 46 | DPD(3, "kmalloc: [%p]\n", handle);
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| 47 |
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| 48 | order = 0;
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| 49 | reqpage = size / PAGE_SIZE;
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| 50 |
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| 51 | if (size % PAGE_SIZE)
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| 52 | reqpage++;
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| 53 |
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| 54 | if (reqpage != 0) {
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| 55 | reqpage--;
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| 56 | while (reqpage > 0) {
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| 57 | reqpage >>= 1;
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| 58 | order++;
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| 59 | }
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| 60 | }
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| 61 |
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| 62 | if ((handle->virtaddx = (void *) __get_free_pages(GFP_KERNEL, order)) == NULL) {
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| 63 | kfree(handle);
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| 64 |
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| 65 | DPD(3, "kfree: [%p]\n", handle);
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| 66 | return (void *) NULL;
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| 67 | }
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| 68 |
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| 69 | /* in linux, we can directly access physical address, don't need to do
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| 70 | * phys_to_virt.
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| 71 | * In linux kernel 2.0.36, virt_to_bus does nothing, get_free_pages
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| 72 | * returns physical address. But in kernel 2.2.1 upwards,
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| 73 | * get_free_pages returns virtual address, we need to convert it
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| 74 | * to physical address. Then this physical address can be used to
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| 75 | * program hardware registers. */
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| 76 | handle->busaddx = virt_to_bus(handle->virtaddx);
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| 77 | handle->order = order;
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| 78 |
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| 79 | DPD(3, "__get_free_pages: [%p] %lx\n", handle->virtaddx, handle->busaddx);
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| 80 |
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| 81 | return handle;
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| 82 | }
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| 83 |
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| 84 | void emu10k1_free_memphysical(struct memhandle *handle)
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| 85 | {
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| 86 | free_pages((unsigned long) handle->virtaddx, handle->order);
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| 87 | kfree(handle);
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| 88 |
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| 89 | DPD(3, "free_pages: [%p]\n", handle->virtaddx);
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| 90 | DPD(3, "kfree: [%p]\n", handle);
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| 91 |
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| 92 | return;
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| 93 | }
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