forked from mirrors/linux
9b8eeab019
Move everything that is not required for the public facing DMA API out of <asm/dma-mapping.h> and into a new drivers/parisc/iommu.h header. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Helge Deller <deller@gmx.de>
29 lines
1,012 B
C
29 lines
1,012 B
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef _PARISC_DMA_MAPPING_H
|
|
#define _PARISC_DMA_MAPPING_H
|
|
|
|
/*
|
|
** We need to support 4 different coherent dma models with one binary:
|
|
**
|
|
** I/O MMU consistent method dma_sync behavior
|
|
** ============= ====================== =======================
|
|
** a) PA-7x00LC uncachable host memory flush/purge
|
|
** b) U2/Uturn cachable host memory NOP
|
|
** c) Ike/Astro cachable host memory NOP
|
|
** d) EPIC/SAGA memory on EPIC/SAGA flush/reset DMA channel
|
|
**
|
|
** PA-7[13]00LC processors have a GSC bus interface and no I/O MMU.
|
|
**
|
|
** Systems (eg PCX-T workstations) that don't fall into the above
|
|
** categories will need to modify the needed drivers to perform
|
|
** flush/purge and allocate "regular" cacheable pages for everything.
|
|
*/
|
|
|
|
extern const struct dma_map_ops *hppa_dma_ops;
|
|
|
|
static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
|
|
{
|
|
return hppa_dma_ops;
|
|
}
|
|
|
|
#endif
|