1// SPDX-License-Identifier: GPL-2.0
2/*
3 *  linux/arch/arm/kernel/dma-ebsa285.c
4 *
5 *  Copyright (C) 1998 Phil Blundell
6 *
7 * DMA functions specific to EBSA-285/CATS architectures
8 *
9 *  Changelog:
10 *   09-Nov-1998 RMK	Split out ISA DMA functions to dma-isa.c
11 *   17-Mar-1999 RMK	Allow any EBSA285-like architecture to have
12 *			ISA DMA controllers.
13 */
14#include <linux/init.h>
15#include <linux/io.h>
16#include <linux/spinlock.h>
17#include <linux/scatterlist.h>
18
19#include <asm/dma.h>
20
21#include <asm/mach/dma.h>
22#include <asm/hardware/dec21285.h>
23
24#if 0
25static int fb_dma_request(unsigned int chan, dma_t *dma)
26{
27	return -EINVAL;
28}
29
30static void fb_dma_enable(unsigned int chan, dma_t *dma)
31{
32}
33
34static void fb_dma_disable(unsigned int chan, dma_t *dma)
35{
36}
37
38static struct dma_ops fb_dma_ops = {
39	.type		= "fb",
40	.request	= fb_dma_request,
41	.enable		= fb_dma_enable,
42	.disable	= fb_dma_disable,
43};
44#endif
45
46static int __init fb_dma_init(void)
47{
48#if 0
49	dma[_DC21285_DMA(0)].d_ops = &fb_dma_ops;
50	dma[_DC21285_DMA(1)].d_ops = &fb_dma_ops;
51#endif
52#ifdef CONFIG_ISA_DMA
53	if (footbridge_cfn_mode())
54		isa_init_dma();
55#endif
56	return 0;
57}
58core_initcall(fb_dma_init);
59