1/*
2 *	linux/arch/alpha/kernel/pci-noop.c
3 *
4 * Stub PCI interfaces for Jensen-specific kernels.
5 */
6
7#include <linux/pci.h>
8#include <linux/init.h>
9#include <linux/bootmem.h>
10#include <linux/capability.h>
11#include <linux/mm.h>
12#include <linux/errno.h>
13#include <linux/sched.h>
14#include <linux/dma-mapping.h>
15
16#include "proto.h"
17
18
19/*
20 * The PCI controller list.
21 */
22
23struct pci_controller *hose_head, **hose_tail = &hose_head;
24struct pci_controller *pci_isa_hose;
25
26
27struct pci_controller * __init
28alloc_pci_controller(void)
29{
30	struct pci_controller *hose;
31
32	hose = alloc_bootmem(sizeof(*hose));
33
34	*hose_tail = hose;
35	hose_tail = &hose->next;
36
37	return hose;
38}
39
40struct resource * __init
41alloc_resource(void)
42{
43	struct resource *res;
44
45	res = alloc_bootmem(sizeof(*res));
46
47	return res;
48}
49
50asmlinkage long
51sys_pciconfig_iobase(long which, unsigned long bus, unsigned long dfn)
52{
53	struct pci_controller *hose;
54
55	/* from hose or from bus.devfn */
56	if (which & IOBASE_FROM_HOSE) {
57		for (hose = hose_head; hose; hose = hose->next)
58			if (hose->index == bus)
59				break;
60		if (!hose)
61			return -ENODEV;
62	} else {
63		/* Special hook for ISA access.  */
64		if (bus == 0 && dfn == 0)
65			hose = pci_isa_hose;
66		else
67			return -ENODEV;
68	}
69
70	switch (which & ~IOBASE_FROM_HOSE) {
71	case IOBASE_HOSE:
72		return hose->index;
73	case IOBASE_SPARSE_MEM:
74		return hose->sparse_mem_base;
75	case IOBASE_DENSE_MEM:
76		return hose->dense_mem_base;
77	case IOBASE_SPARSE_IO:
78		return hose->sparse_io_base;
79	case IOBASE_DENSE_IO:
80		return hose->dense_io_base;
81	case IOBASE_ROOT_BUS:
82		return hose->bus->number;
83	}
84
85	return -EOPNOTSUPP;
86}
87
88asmlinkage long
89sys_pciconfig_read(unsigned long bus, unsigned long dfn,
90		   unsigned long off, unsigned long len, void *buf)
91{
92	if (!capable(CAP_SYS_ADMIN))
93		return -EPERM;
94	else
95		return -ENODEV;
96}
97
98asmlinkage long
99sys_pciconfig_write(unsigned long bus, unsigned long dfn,
100		    unsigned long off, unsigned long len, void *buf)
101{
102	if (!capable(CAP_SYS_ADMIN))
103		return -EPERM;
104	else
105		return -ENODEV;
106}
107
108/* Stubs for the routines in pci_iommu.c: */
109
110void *
111pci_alloc_consistent(struct pci_dev *pdev, size_t size, dma_addr_t *dma_addrp)
112{
113	return NULL;
114}
115
116void
117pci_free_consistent(struct pci_dev *pdev, size_t size, void *cpu_addr,
118		    dma_addr_t dma_addr)
119{
120}
121
122dma_addr_t
123pci_map_single(struct pci_dev *pdev, void *cpu_addr, size_t size,
124	       int direction)
125{
126	return (dma_addr_t) 0;
127}
128
129void
130pci_unmap_single(struct pci_dev *pdev, dma_addr_t dma_addr, size_t size,
131		 int direction)
132{
133}
134
135int
136pci_map_sg(struct pci_dev *pdev, struct scatterlist *sg, int nents,
137	   int direction)
138{
139	return 0;
140}
141
142void
143pci_unmap_sg(struct pci_dev *pdev, struct scatterlist *sg, int nents,
144	     int direction)
145{
146}
147
148int
149pci_dma_supported(struct pci_dev *hwdev, dma_addr_t mask)
150{
151	return 0;
152}
153
154/* Generic DMA mapping functions: */
155
156void *
157dma_alloc_coherent(struct device *dev, size_t size,
158		   dma_addr_t *dma_handle, gfp_t gfp)
159{
160	void *ret;
161
162	if (!dev || *dev->dma_mask >= 0xffffffffUL)
163		gfp &= ~GFP_DMA;
164	ret = (void *)__get_free_pages(gfp, get_order(size));
165	if (ret) {
166		memset(ret, 0, size);
167		*dma_handle = virt_to_bus(ret);
168	}
169	return ret;
170}
171
172EXPORT_SYMBOL(dma_alloc_coherent);
173
174int
175dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
176	   enum dma_data_direction direction)
177{
178	int i;
179
180	for (i = 0; i < nents; i++ ) {
181		void *va;
182
183		BUG_ON(!sg[i].page);
184		va = page_address(sg[i].page) + sg[i].offset;
185		sg_dma_address(sg + i) = (dma_addr_t)virt_to_bus(va);
186		sg_dma_len(sg + i) = sg[i].length;
187	}
188
189	return nents;
190}
191
192EXPORT_SYMBOL(dma_map_sg);
193
194int
195dma_set_mask(struct device *dev, u64 mask)
196{
197	if (!dev->dma_mask || !dma_supported(dev, mask))
198		return -EIO;
199
200	*dev->dma_mask = mask;
201
202	return 0;
203}
204EXPORT_SYMBOL(dma_set_mask);
205
206void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
207{
208	return NULL;
209}
210
211void pci_iounmap(struct pci_dev *dev, void __iomem * addr)
212{
213}
214
215EXPORT_SYMBOL(pci_iomap);
216EXPORT_SYMBOL(pci_iounmap);
217