summaryrefslogtreecommitdiffstats
path: root/include/asm-sparc64/pci.h
blob: e1ea67bc32f22f515db611a2874358679932133a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
#ifndef __SPARC64_PCI_H
#define __SPARC64_PCI_H

#ifdef __KERNEL__

#include <linux/fs.h>
#include <linux/mm.h>

/* Can be used to override the logic in pci_scan_bus for skipping
 * already-configured bus numbers - to be used for buggy BIOSes
 * or architectures with incomplete PCI setup by the loader.
 */
#define pcibios_assign_all_busses()	0
#define pcibios_scan_all_fns(a, b)	0

#define PCIBIOS_MIN_IO		0UL
#define PCIBIOS_MIN_MEM		0UL

#define PCI_IRQ_NONE		0xffffffff

static inline void pcibios_set_master(struct pci_dev *dev)
{
	/* No special bus mastering setup handling */
}

static inline void pcibios_penalize_isa_irq(int irq, int active)
{
	/* We don't do dynamic PCI IRQ allocation */
}

/* Dynamic DMA mapping stuff.
 */

/* The PCI address space does not equal the physical memory
 * address space.  The networking and block device layers use
 * this boolean for bounce buffer decisions.
 */
#define PCI_DMA_BUS_IS_PHYS	(0)

#include <asm/scatterlist.h>

struct pci_dev;

struct pci_iommu_ops {
	void *(*alloc_consistent)(struct pci_dev *, size_t, dma_addr_t *, gfp_t);
	void (*free_consistent)(struct pci_dev *, size_t, void *, dma_addr_t);
	dma_addr_t (*map_single)(struct pci_dev *, void *, size_t, int);
	void (*unmap_single)(struct pci_dev *, dma_addr_t, size_t, int);
	int (*map_sg)(struct pci_dev *, struct scatterlist *, int, int);
	void (*unmap_sg)(struct pci_dev *, struct scatterlist *, int, int);
	void (*dma_sync_single_for_cpu)(struct pci_dev *, dma_addr_t, size_t, int);
	void (*dma_sync_sg_for_cpu)(struct pci_dev *, struct scatterlist *, int, int);
};

extern struct pci_iommu_ops *pci_iommu_ops;

/* Allocate and map kernel buffer using consistent mode DMA for a device.
 * hwdev should be valid struct pci_dev pointer for PCI devices.
 */
static inline void *pci_alloc_consistent(struct pci_dev *hwdev, size_t size, dma_addr_t *dma_handle)
{
	return pci_iommu_ops->alloc_consistent(hwdev, size, dma_handle, GFP_ATOMIC);
}

/* Free and unmap a consistent DMA buffer.
 * cpu_addr is what was returned from pci_alloc_consistent,
 * size must be the same as what as passed into pci_alloc_consistent,
 * and likewise dma_addr must be the same as what *dma_addrp was set to.
 *
 * References to the memory and mappings associated with cpu_addr/dma_addr
 * past this call are illegal.
 */
static inline void pci_free_consistent(struct pci_dev *hwdev, size_t size, void *vaddr, dma_addr_t dma_handle)
{
	return pci_iommu_ops->free_consistent(hwdev, size, vaddr, dma_handle);
}

/* Map a single buffer of the indicated size for DMA in streaming mode.
 * The 32-bit bus address to use is returned.
 *
 * Once the device is given the dma address, the device owns this memory
 * until either pci_unmap_single or pci_dma_sync_single_for_cpu is performed.
 */
static inline dma_addr_t pci_map_single(struct pci_dev *hwdev, void *ptr, size_t size, int direction)
{
	return pci_iommu_ops->map_single(hwdev, ptr, size, direction);
}

/* Unmap a single streaming mode DMA translation.  The dma_addr and size
 * must match what was provided for in a previous pci_map_single call.  All
 * other usages are undefined.
 *
 * After this call, reads by the cpu to the buffer are guaranteed to see
 * whatever the device wrote there.
 */
static inline void pci_unmap_single(struct pci_dev *hwdev, dma_addr_t dma_addr, size_t size, int direction)
{
	pci_iommu_ops->unmap_single(hwdev, dma_addr, size, direction);
}

/* No highmem on sparc64, plus we have an IOMMU, so mapping pages is easy. */
#define pci_map_page(dev, page, off, size, dir) \
	pci_map_single(dev, (page_address(page) + (off)), size, dir)
#define pci_unmap_page(dev,addr,sz,dir) pci_unmap_single(dev,addr,sz,dir)

/* pci_unmap_{single,page} is not a nop, thus... */
#define DECLARE_PCI_UNMAP_ADDR(ADDR_NAME)	\
	dma_addr_t ADDR_NAME;
#define DECLARE_PCI_UNMAP_LEN(LEN_NAME)		\
	__u32 LEN_NAME;
#define pci_unmap_addr(PTR, ADDR_NAME)			\
	((PTR)->ADDR_NAME)
#define pci_unmap_addr_set(PTR, ADDR_NAME, VAL)		\
	(((PTR)->ADDR_NAME) = (VAL))
#define pci_unmap_len(PTR, LEN_NAME)			\
	((PTR)->LEN_NAME)
#define pci_unmap_len_set(PTR, LEN_NAME, VAL)		\
	(((PTR)->LEN_NAME) = (VAL))

/* Map a set of buffers described by scatterlist in streaming
 * mode for DMA.  This is the scatter-gather version of the
 * above pci_map_single interface.  Here the scatter gather list
 * elements are each tagged with the appropriate dma address
 * and length.  They are obtained via sg_dma_{address,length}(SG).
 *
 * NOTE: An implementation may be able to use a smaller number of
 *       DMA address/length pairs than there are SG table elements.
 *       (for example via virtual mapping capabilities)
 *       The routine returns the number of addr/length pairs actually
 *       used, at most nents.
 *
 * Device ownership issues as mentioned above for pci_map_single are
 * the same here.
 */
static inline int pci_map_sg(struct pci_dev *hwdev, struct scatterlist *sg, int nents, int direction)
{
	return pci_iommu_ops->map_sg(hwdev, sg, nents, direction);
}

/* Unmap a set of streaming mode DMA translations.
 * Again, cpu read rules concerning calls here are the same as for
 * pci_unmap_single() above.
 */
static inline void pci_unmap_sg(struct pci_dev *hwdev, struct scatterlist *sg, int nhwents, int direction)
{
	pci_iommu_ops->unmap_sg(hwdev, sg, nhwents, direction);
}

/* Make physical memory consistent for a single
 * streaming mode DMA translation after a transfer.
 *
 * If you perform a pci_map_single() but wish to interrogate the
 * buffer using the cpu, yet do not wish to teardown the PCI dma
 * mapping, you must call this function before doing so.  At the
 * next point you give the PCI dma address back to the card, you
 * must first perform a pci_dma_sync_for_device, and then the
 * device again owns the buffer.
 */
static inline void pci_dma_sync_single_for_cpu(struct pci_dev *hwdev, dma_addr_t dma_handle, size_t size, int direction)
{
	pci_iommu_ops->dma_sync_single_for_cpu(hwdev, dma_handle, size, direction);
}

static inline void
pci_dma_sync_single_for_device(struct pci_dev *hwdev, dma_addr_t dma_handle,
			       size_t size, int direction)
{
	/* No flushing needed to sync cpu writes to the device.  */
	BUG_ON(direction == PCI_DMA_NONE);
}

/* Make physical memory consistent for a set of streaming
 * mode DMA translations after a transfer.
 *
 * The same as pci_dma_sync_single_* but for a scatter-gather list,
 * same rules and usage.
 */
static inline void pci_dma_sync_sg_for_cpu(struct pci_dev *hwdev, struct scatterlist *sg, int nelems, int direction)
{
	pci_iommu_ops->dma_sync_sg_for_cpu(hwdev, sg, nelems, direction);
}

static inline void
pci_dma_sync_sg_for_device(struct pci_dev *hwdev, struct scatterlist *sg,
			int nelems, int direction)
{
	/* No flushing needed to sync cpu writes to the device.  */
	BUG_ON(direction == PCI_DMA_NONE);
}

/* Return whether the given PCI device DMA address mask can
 * be supported properly.  For example, if your device can
 * only drive the low 24-bits during PCI bus mastering, then
 * you would pass 0x00ffffff as the mask to this function.
 */
extern int pci_dma_supported(struct pci_dev *hwdev, u64 mask);

/* PCI IOMMU mapping bypass support. */

/* PCI 64-bit addressing works for all slots on all controller
 * types on sparc64.  However, it requires that the device
 * can drive enough of the 64 bits.
 */
#define PCI64_REQUIRED_MASK	(~(dma64_addr_t)0)
#define PCI64_ADDR_BASE		0xfffc000000000000UL

/* Usage of the pci_dac_foo interfaces is only valid if this
 * test passes.
 */
#define pci_dac_dma_supported(pci_dev, mask) \
	((((mask) & PCI64_REQUIRED_MASK) == PCI64_REQUIRED_MASK) ? 1 : 0)

static inline dma64_addr_t
pci_dac_page_to_dma(struct pci_dev *pdev, struct page *page, unsigned long offset, int direction)
{
	return (PCI64_ADDR_BASE +
		__pa(page_address(page)) + offset);
}

static inline struct page *
pci_dac_dma_to_page(struct pci_dev *pdev, dma64_addr_t dma_addr)
{
	unsigned long paddr = (dma_addr & PAGE_MASK) - PCI64_ADDR_BASE;

	return virt_to_page(__va(paddr));
}

static inline unsigned long
pci_dac_dma_to_offset(struct pci_dev *pdev, dma64_addr_t dma_addr)
{
	return (dma_addr & ~PAGE_MASK);
}

static inline void
pci_dac_dma_sync_single_for_cpu(struct pci_dev *pdev, dma64_addr_t dma_addr, size_t len, int direction)
{
	/* DAC cycle addressing does not make use of the
	 * PCI controller's streaming cache, so nothing to do.
	 */
}

static inline void
pci_dac_dma_sync_single_for_device(struct pci_dev *pdev, dma64_addr_t dma_addr, size_t len, int direction)
{
	/* DAC cycle addressing does not make use of the
	 * PCI controller's streaming cache, so nothing to do.
	 */
}

#define PCI_DMA_ERROR_CODE	(~(dma_addr_t)0x0)

static inline int pci_dma_mapping_error(dma_addr_t dma_addr)
{
	return (dma_addr == PCI_DMA_ERROR_CODE);
}

#ifdef CONFIG_PCI
static inline void pci_dma_burst_advice(struct pci_dev *pdev,
					enum pci_dma_burst_strategy *strat,
					unsigned long *strategy_parameter)
{
	unsigned long cacheline_size;
	u8 byte;

	pci_read_config_byte(pdev, PCI_CACHE_LINE_SIZE, &byte);
	if (byte == 0)
		cacheline_size = 1024;
	else
		cacheline_size = (int) byte * 4;

	*strat = PCI_DMA_BURST_BOUNDARY;
	*strategy_parameter = cacheline_size;
}
#endif

/* Return the index of the PCI controller for device PDEV. */

extern int pci_domain_nr(struct pci_bus *bus);
static inline int pci_proc_domain(struct pci_bus *bus)
{
	return 1;
}

/* Platform support for /proc/bus/pci/X/Y mmap()s. */

#define HAVE_PCI_MMAP
#define HAVE_ARCH_PCI_GET_UNMAPPED_AREA
#define get_pci_unmapped_area get_fb_unmapped_area

extern int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
			       enum pci_mmap_state mmap_state,
			       int write_combine);

/* Platform specific MWI support. */
#define HAVE_ARCH_PCI_MWI
extern int pcibios_prep_mwi(struct pci_dev *dev);

extern void
pcibios_resource_to_bus(struct pci_dev *dev, struct pci_bus_region *region,
			struct resource *res);

extern void
pcibios_bus_to_resource(struct pci_dev *dev, struct resource *res,
			struct pci_bus_region *region);

extern struct resource *pcibios_select_root(struct pci_dev *, struct resource *);

static inline void pcibios_add_platform_entries(struct pci_dev *dev)
{
}

static inline int pci_get_legacy_ide_irq(struct pci_dev *dev, int channel)
{
	return PCI_IRQ_NONE;
}

#endif /* __KERNEL__ */

#endif /* __SPARC64_PCI_H */