1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * Copyright 2002 Integrated Device Technology, Inc.
4 * All rights reserved.
5 *
6 * DMA register definition.
7 *
8 * Author : ryan.holmQVist@idt.com
9 * Date : 20011005
10 */
11
12 #ifndef _ASM_RC32434_DMA_V_H_
13 #define _ASM_RC32434_DMA_V_H_
14
15 #include <asm/mach-rc32434/dma.h>
16 #include <asm/mach-rc32434/rc32434.h>
17
18 #define DMA_CHAN_OFFSET 0x14
19 #define IS_DMA_USED(X) (((X) & \
20 (DMA_DESC_FINI | DMA_DESC_DONE | DMA_DESC_TERM)) \
21 != 0)
22 #define DMA_COUNT(count) ((count) & DMA_DESC_COUNT_MSK)
23
24 #define DMA_HALT_TIMEOUT 500
25
26 static inline int rc32434_halt_dma(struct dma_reg *ch)
27 {
28 int timeout = 1;
29 if (__raw_readl(&ch->dmac) & DMA_CHAN_RUN_BIT) {
30 __raw_writel(0, &ch->dmac);
31 for (timeout = DMA_HALT_TIMEOUT; timeout > 0; timeout--) {
32 if (__raw_readl(&ch->dmas) & DMA_STAT_HALT) {
33 __raw_writel(0, &ch->dmas);
34 break;
35 }
36 }
37 }
38
39 return timeout ? 0 : 1;
40 }
41
42 static inline void rc32434_start_dma(struct dma_reg *ch, u32 dma_addr)
43 {
44 __raw_writel(0, &ch->dmandptr);
45 __raw_writel(dma_addr, &ch->dmadptr);
46 }
47
48 static inline void rc32434_chain_dma(struct dma_reg *ch, u32 dma_addr)
49 {
50 __raw_writel(dma_addr, &ch->dmandptr);
51 }
52
53 #endif /* _ASM_RC32434_DMA_V_H_ */
54
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