forked from luck/tmp_suning_uos_patched
99532559dc
Patch from Nicolas Pitre Intel PXA27x developers manual section 5.4.1.1 lists a priority distribution for the DMA channels differently than what the code currently assumes. This patch fixes that. Noticed by Simon Vogl <vogl@soft.uni-linz.ac.at> Signed-off-by: Nicolas Pitre <nico@cam.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
65 lines
1.5 KiB
C
65 lines
1.5 KiB
C
/*
|
|
* linux/include/asm-arm/arch-pxa/dma.h
|
|
*
|
|
* Author: Nicolas Pitre
|
|
* Created: Jun 15, 2001
|
|
* Copyright: MontaVista Software, Inc.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
#ifndef __ASM_ARCH_DMA_H
|
|
#define __ASM_ARCH_DMA_H
|
|
|
|
/*
|
|
* Descriptor structure for PXA's DMA engine
|
|
* Note: this structure must always be aligned to a 16-byte boundary.
|
|
*/
|
|
|
|
typedef struct pxa_dma_desc {
|
|
volatile u32 ddadr; /* Points to the next descriptor + flags */
|
|
volatile u32 dsadr; /* DSADR value for the current transfer */
|
|
volatile u32 dtadr; /* DTADR value for the current transfer */
|
|
volatile u32 dcmd; /* DCMD value for the current transfer */
|
|
} pxa_dma_desc;
|
|
|
|
typedef enum {
|
|
DMA_PRIO_HIGH = 0,
|
|
DMA_PRIO_MEDIUM = 1,
|
|
DMA_PRIO_LOW = 2
|
|
} pxa_dma_prio;
|
|
|
|
#if defined(CONFIG_PXA27x)
|
|
|
|
#define PXA_DMA_CHANNELS 32
|
|
|
|
#define pxa_for_each_dma_prio(ch, prio) \
|
|
for ( \
|
|
ch = prio * 4; \
|
|
ch != (4 << prio) + 16; \
|
|
ch = (ch + 1 == (4 << prio)) ? (prio * 4 + 16) : (ch + 1) \
|
|
)
|
|
|
|
#elif defined(CONFIG_PXA25x)
|
|
|
|
#define PXA_DMA_CHANNELS 16
|
|
|
|
#define pxa_for_each_dma_prio(ch, prio) \
|
|
for (ch = prio * 4; ch != (4 << prio); ch++)
|
|
|
|
#endif
|
|
|
|
/*
|
|
* DMA registration
|
|
*/
|
|
|
|
int pxa_request_dma (char *name,
|
|
pxa_dma_prio prio,
|
|
void (*irq_handler)(int, void *, struct pt_regs *),
|
|
void *data);
|
|
|
|
void pxa_free_dma (int dma_ch);
|
|
|
|
#endif /* _ASM_ARCH_DMA_H */
|