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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _PARISC_DMA_MAPPING_H
#define _PARISC_DMA_MAPPING_H
#include <asm/cacheflush.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;
}
static inline void *
parisc_walk_tree(struct device *dev)
{
struct device *otherdev;
if(likely(dev->platform_data != NULL))
return dev->platform_data;
/* OK, just traverse the bus to find it */
for(otherdev = dev->parent; otherdev;
otherdev = otherdev->parent) {
if(otherdev->platform_data) {
dev->platform_data = otherdev->platform_data;
break;
}
}
return dev->platform_data;
}
#define GET_IOC(dev) ({ \
void *__pdata = parisc_walk_tree(dev); \
__pdata ? HBA_DATA(__pdata)->iommu : NULL; \
})
#ifdef CONFIG_IOMMU_CCIO
struct parisc_device;
struct ioc;
void * ccio_get_iommu(const struct parisc_device *dev);
int ccio_request_resource(const struct parisc_device *dev,
struct resource *res);
int ccio_allocate_resource(const struct parisc_device *dev,
struct resource *res, unsigned long size,
unsigned long min, unsigned long max, unsigned long align);
#else /* !CONFIG_IOMMU_CCIO */
#define ccio_get_iommu(dev) NULL
#define ccio_request_resource(dev, res) insert_resource(&iomem_resource, res)
#define ccio_allocate_resource(dev, res, size, min, max, align) \
allocate_resource(&iomem_resource, res, size, min, max, \
align, NULL, NULL)
#endif /* !CONFIG_IOMMU_CCIO */
#ifdef CONFIG_IOMMU_SBA
struct parisc_device;
void * sba_get_iommu(struct parisc_device *dev);
#endif
#endif
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