tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _PARISC_DMA_MAPPING_H
3#define _PARISC_DMA_MAPPING_H
4
5#include <asm/cacheflush.h>
6
7/*
8** We need to support 4 different coherent dma models with one binary:
9**
10** I/O MMU consistent method dma_sync behavior
11** ============= ====================== =======================
12** a) PA-7x00LC uncachable host memory flush/purge
13** b) U2/Uturn cachable host memory NOP
14** c) Ike/Astro cachable host memory NOP
15** d) EPIC/SAGA memory on EPIC/SAGA flush/reset DMA channel
16**
17** PA-7[13]00LC processors have a GSC bus interface and no I/O MMU.
18**
19** Systems (eg PCX-T workstations) that don't fall into the above
20** categories will need to modify the needed drivers to perform
21** flush/purge and allocate "regular" cacheable pages for everything.
22*/
23
24#ifdef CONFIG_PA11
25extern const struct dma_map_ops pcxl_dma_ops;
26extern const struct dma_map_ops pcx_dma_ops;
27#endif
28
29extern const struct dma_map_ops *hppa_dma_ops;
30
31static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
32{
33 return hppa_dma_ops;
34}
35
36static inline void *
37parisc_walk_tree(struct device *dev)
38{
39 struct device *otherdev;
40 if(likely(dev->platform_data != NULL))
41 return dev->platform_data;
42 /* OK, just traverse the bus to find it */
43 for(otherdev = dev->parent; otherdev;
44 otherdev = otherdev->parent) {
45 if(otherdev->platform_data) {
46 dev->platform_data = otherdev->platform_data;
47 break;
48 }
49 }
50 return dev->platform_data;
51}
52
53#define GET_IOC(dev) ({ \
54 void *__pdata = parisc_walk_tree(dev); \
55 __pdata ? HBA_DATA(__pdata)->iommu : NULL; \
56})
57
58#ifdef CONFIG_IOMMU_CCIO
59struct parisc_device;
60struct ioc;
61void * ccio_get_iommu(const struct parisc_device *dev);
62int ccio_request_resource(const struct parisc_device *dev,
63 struct resource *res);
64int ccio_allocate_resource(const struct parisc_device *dev,
65 struct resource *res, unsigned long size,
66 unsigned long min, unsigned long max, unsigned long align);
67#else /* !CONFIG_IOMMU_CCIO */
68#define ccio_get_iommu(dev) NULL
69#define ccio_request_resource(dev, res) insert_resource(&iomem_resource, res)
70#define ccio_allocate_resource(dev, res, size, min, max, align) \
71 allocate_resource(&iomem_resource, res, size, min, max, \
72 align, NULL, NULL)
73#endif /* !CONFIG_IOMMU_CCIO */
74
75#ifdef CONFIG_IOMMU_SBA
76struct parisc_device;
77void * sba_get_iommu(struct parisc_device *dev);
78#endif
79
80#endif