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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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5d9df8eeac
This patch fixes the DMA cascade by masking the correct bits. Tested and working with Dreamcast PVR2 DMA. With this patch applied the existing mainline code in arch/sh/drivers/dma/dma-sh.c works, whereas before I was patching that to get round this problem. Signed-off-by: Adrian McMenamin <adrian@mcmen.demon.co.uk> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
66 lines
1.3 KiB
C
66 lines
1.3 KiB
C
#ifndef __ASM_CPU_SH4_DMA_H
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#define __ASM_CPU_SH4_DMA_H
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#define DMAOR_INIT ( 0x8000 | DMAOR_DME )
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/* SH7751/7760/7780 DMA IRQ sources */
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#define DMTE0_IRQ 34
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#define DMTE1_IRQ 35
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#define DMTE2_IRQ 36
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#define DMTE3_IRQ 37
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#define DMTE4_IRQ 44
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#define DMTE5_IRQ 45
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#define DMTE6_IRQ 46
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#define DMTE7_IRQ 47
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#define DMAE_IRQ 38
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#ifdef CONFIG_CPU_SH4A
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#define SH_DMAC_BASE 0xfc808020
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#define CHCR_TS_MASK 0x18
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#define CHCR_TS_SHIFT 3
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#include <asm/cpu/dma-sh7780.h>
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#else
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#define SH_DMAC_BASE 0xffa00000
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/* Definitions for the SuperH DMAC */
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#define TM_BURST 0x0000080
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#define TS_8 0x00000010
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#define TS_16 0x00000020
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#define TS_32 0x00000030
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#define TS_64 0x00000000
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#define CHCR_TS_MASK 0x70
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#define CHCR_TS_SHIFT 4
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#define DMAOR_COD 0x00000008
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/*
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* The SuperH DMAC supports a number of transmit sizes, we list them here,
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* with their respective values as they appear in the CHCR registers.
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*
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* Defaults to a 64-bit transfer size.
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*/
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enum {
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XMIT_SZ_64BIT,
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XMIT_SZ_8BIT,
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XMIT_SZ_16BIT,
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XMIT_SZ_32BIT,
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XMIT_SZ_256BIT,
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};
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/*
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* The DMA count is defined as the number of bytes to transfer.
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*/
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static unsigned int ts_shift[] __maybe_unused = {
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[XMIT_SZ_64BIT] = 3,
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[XMIT_SZ_8BIT] = 0,
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[XMIT_SZ_16BIT] = 1,
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[XMIT_SZ_32BIT] = 2,
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[XMIT_SZ_256BIT] = 5,
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};
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#endif
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#endif /* __ASM_CPU_SH4_DMA_H */
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