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