1#ifndef ASMARM_PCI_H
2#define ASMARM_PCI_H
3
4#ifdef __KERNEL__
5
6#include <asm/arch/hardware.h>
7
8static inline void pcibios_set_master(struct pci_dev *dev)
9{
10	/* No special bus mastering setup handling */
11}
12
13static inline void pcibios_penalize_isa_irq(int irq)
14{
15	/* We don't do dynamic PCI IRQ allocation */
16}
17
18#include <asm/scatterlist.h>
19#include <asm/io.h>
20
21struct pci_dev;
22
23/* Allocate and map kernel buffer using consistent mode DMA for a device.
24 * hwdev should be valid struct pci_dev pointer for PCI devices,
25 * NULL for PCI-like buses (ISA, EISA).
26 * Returns non-NULL cpu-view pointer to the buffer if successful and
27 * sets *dma_addrp to the pci side dma address as well, else *dma_addrp
28 * is undefined.
29 */
30extern void *pci_alloc_consistent(struct pci_dev *hwdev, size_t size, dma_addr_t *handle);
31
32/* Free and unmap a consistent DMA buffer.
33 * cpu_addr is what was returned from pci_alloc_consistent,
34 * size must be the same as what as passed into pci_alloc_consistent,
35 * and likewise dma_addr must be the same as what *dma_addrp was set to.
36 *
37 * References to the memory and mappings associated with cpu_addr/dma_addr
38 * past this call are illegal.
39 */
40static inline void
41pci_free_consistent(struct pci_dev *hwdev, size_t size, void *vaddr,
42		    dma_addr_t dma_handle)
43{
44	consistent_free(vaddr, size, dma_handle);
45}
46
47/* Map a single buffer of the indicated size for DMA in streaming mode.
48 * The 32-bit bus address to use is returned.
49 *
50 * Once the device is given the dma address, the device owns this memory
51 * until either pci_unmap_single or pci_dma_sync_single is performed.
52 */
53static inline dma_addr_t
54pci_map_single(struct pci_dev *hwdev, void *ptr, size_t size, int direction)
55{
56#ifdef CONFIG_SA1111
57	extern dma_addr_t sa1111_map_single(struct pci_dev *, void *, size_t, int);
58
59	/*
60	 * for SA1111 these functions are "magic" and relocate buffers.  We
61	 * only need to do these if hwdev is non-null; otherwise we expect
62	 * the buffer to already be suitable for DMA.
63	 */
64	if (hwdev != NULL)
65		return sa1111_map_single(hwdev, ptr, size, direction);
66#endif
67	consistent_sync(ptr, size, direction);
68	return virt_to_bus(ptr);
69}
70
71/* Unmap a single streaming mode DMA translation.  The dma_addr and size
72 * must match what was provided for in a previous pci_map_single call.  All
73 * other usages are undefined.
74 *
75 * After this call, reads by the cpu to the buffer are guarenteed to see
76 * whatever the device wrote there.
77 */
78static inline void
79pci_unmap_single(struct pci_dev *hwdev, dma_addr_t dma_addr, size_t size, int direction)
80{
81#ifdef CONFIG_SA1111
82	extern void sa1111_unmap_single(struct pci_dev *, dma_addr_t, size_t, int);
83
84	if (hwdev != NULL)
85		sa1111_unmap_single(hwdev, dma_addr, size, direction);
86#endif
87	/* nothing to do */
88}
89
90/* Whether pci_unmap_{single,page} is a nop depends upon the
91 * configuration.
92 */
93#ifdef CONFIG_SA1111
94#define DECLARE_PCI_UNMAP_ADDR(ADDR_NAME)	\
95	dma_addr_t ADDR_NAME;
96#define DECLARE_PCI_UNMAP_LEN(LEN_NAME)		\
97	__u32 LEN_NAME;
98#define pci_unmap_addr(PTR, ADDR_NAME)			\
99	((PTR)->ADDR_NAME)
100#define pci_unmap_addr_set(PTR, ADDR_NAME, VAL)		\
101	(((PTR)->ADDR_NAME) = (VAL))
102#define pci_unmap_len(PTR, LEN_NAME)			\
103	((PTR)->LEN_NAME)
104#define pci_unmap_len_set(PTR, LEN_NAME, VAL)		\
105	(((PTR)->LEN_NAME) = (VAL))
106#else /* !(CONFIG_SA1111) */
107#define DECLARE_PCI_UNMAP_ADDR(ADDR_NAME)
108#define DECLARE_PCI_UNMAP_LEN(LEN_NAME)
109#define pci_unmap_addr(PTR, ADDR_NAME)		(0)
110#define pci_unmap_addr_set(PTR, ADDR_NAME, VAL)	do { } while (0)
111#define pci_unmap_len(PTR, LEN_NAME)		(0)
112#define pci_unmap_len_set(PTR, LEN_NAME, VAL)	do { } while (0)
113#endif /* CONFIG_SA1111 */
114
115/* Map a set of buffers described by scatterlist in streaming
116 * mode for DMA.  This is the scather-gather version of the
117 * above pci_map_single interface.  Here the scatter gather list
118 * elements are each tagged with the appropriate dma address
119 * and length.  They are obtained via sg_dma_{address,length}(SG).
120 *
121 * NOTE: An implementation may be able to use a smaller number of
122 *       DMA address/length pairs than there are SG table elements.
123 *       (for example via virtual mapping capabilities)
124 *       The routine returns the number of addr/length pairs actually
125 *       used, at most nents.
126 *
127 * Device ownership issues as mentioned above for pci_map_single are
128 * the same here.
129 */
130static inline int
131pci_map_sg(struct pci_dev *hwdev, struct scatterlist *sg, int nents, int direction)
132{
133	int i;
134
135	for (i = 0; i < nents; i++, sg++) {
136		consistent_sync(sg->address, sg->length, direction);
137		sg->dma_address = virt_to_bus(sg->address);
138	}
139
140	return nents;
141}
142
143/* Unmap a set of streaming mode DMA translations.
144 * Again, cpu read rules concerning calls here are the same as for
145 * pci_unmap_single() above.
146 */
147static inline void
148pci_unmap_sg(struct pci_dev *hwdev, struct scatterlist *sg, int nents, int direction)
149{
150	/* nothing to do */
151}
152
153/* Make physical memory consistent for a single
154 * streaming mode DMA translation after a transfer.
155 *
156 * If you perform a pci_map_single() but wish to interrogate the
157 * buffer using the cpu, yet do not wish to teardown the PCI dma
158 * mapping, you must call this function before doing so.  At the
159 * next point you give the PCI dma address back to the card, the
160 * device again owns the buffer.
161 */
162static inline void
163pci_dma_sync_single(struct pci_dev *hwdev, dma_addr_t dma_handle, size_t size, int direction)
164{
165	consistent_sync(bus_to_virt(dma_handle), size, direction);
166}
167
168/* Make physical memory consistent for a set of streaming
169 * mode DMA translations after a transfer.
170 *
171 * The same as pci_dma_sync_single but for a scatter-gather list,
172 * same rules and usage.
173 */
174static inline void
175pci_dma_sync_sg(struct pci_dev *hwdev, struct scatterlist *sg, int nelems, int direction)
176{
177	int i;
178
179	for (i = 0; i < nelems; i++, sg++)
180		consistent_sync(sg->address, sg->length, direction);
181}
182
183/* Return whether the given PCI device DMA address mask can
184 * be supported properly.  For example, if your device can
185 * only drive the low 24-bits during PCI bus mastering, then
186 * you would pass 0x00ffffff as the mask to this function.
187 */
188static inline int pci_dma_supported(struct pci_dev *hwdev, u64 mask)
189{
190	return 1;
191}
192
193/* This isn't fine. */
194#define pci_dac_dma_supported(pci_dev, mask)	(0)
195
196/* Return the index of the PCI controller for device PDEV. */
197#define pci_controller_num(PDEV)	(0)
198
199#endif /* __KERNEL__ */
200
201#endif
202