2 * linux/arch/alpha/kernel/pci-noop.c
4 * Stub PCI interfaces for Jensen-specific kernels.
8 #include <linux/init.h>
9 #include <linux/bootmem.h>
10 #include <linux/gfp.h>
11 #include <linux/capability.h>
13 #include <linux/errno.h>
14 #include <linux/sched.h>
15 #include <linux/dma-mapping.h>
16 #include <linux/scatterlist.h>
22 * The PCI controller list.
25 struct pci_controller *hose_head, **hose_tail = &hose_head;
26 struct pci_controller *pci_isa_hose;
29 struct pci_controller * __init
30 alloc_pci_controller(void)
32 struct pci_controller *hose;
34 hose = alloc_bootmem(sizeof(*hose));
37 hose_tail = &hose->next;
42 struct resource * __init
47 res = alloc_bootmem(sizeof(*res));
53 sys_pciconfig_iobase(long which, unsigned long bus, unsigned long dfn)
55 struct pci_controller *hose;
57 /* from hose or from bus.devfn */
58 if (which & IOBASE_FROM_HOSE) {
59 for (hose = hose_head; hose; hose = hose->next)
60 if (hose->index == bus)
65 /* Special hook for ISA access. */
66 if (bus == 0 && dfn == 0)
72 switch (which & ~IOBASE_FROM_HOSE) {
75 case IOBASE_SPARSE_MEM:
76 return hose->sparse_mem_base;
77 case IOBASE_DENSE_MEM:
78 return hose->dense_mem_base;
79 case IOBASE_SPARSE_IO:
80 return hose->sparse_io_base;
82 return hose->dense_io_base;
84 return hose->bus->number;
91 sys_pciconfig_read(unsigned long bus, unsigned long dfn,
92 unsigned long off, unsigned long len, void *buf)
94 if (!capable(CAP_SYS_ADMIN))
101 sys_pciconfig_write(unsigned long bus, unsigned long dfn,
102 unsigned long off, unsigned long len, void *buf)
104 if (!capable(CAP_SYS_ADMIN))
110 static void *alpha_noop_alloc_coherent(struct device *dev, size_t size,
111 dma_addr_t *dma_handle, gfp_t gfp)
115 if (!dev || *dev->dma_mask >= 0xffffffffUL)
117 ret = (void *)__get_free_pages(gfp, get_order(size));
119 memset(ret, 0, size);
120 *dma_handle = virt_to_phys(ret);
125 static void alpha_noop_free_coherent(struct device *dev, size_t size,
126 void *cpu_addr, dma_addr_t dma_addr)
128 free_pages((unsigned long)cpu_addr, get_order(size));
131 static dma_addr_t alpha_noop_map_page(struct device *dev, struct page *page,
132 unsigned long offset, size_t size,
133 enum dma_data_direction dir,
134 struct dma_attrs *attrs)
136 return page_to_pa(page) + offset;
139 static int alpha_noop_map_sg(struct device *dev, struct scatterlist *sgl, int nents,
140 enum dma_data_direction dir, struct dma_attrs *attrs)
143 struct scatterlist *sg;
145 for_each_sg(sgl, sg, nents, i) {
148 BUG_ON(!sg_page(sg));
150 sg_dma_address(sg) = (dma_addr_t)virt_to_phys(va);
151 sg_dma_len(sg) = sg->length;
157 static int alpha_noop_mapping_error(struct device *dev, dma_addr_t dma_addr)
162 static int alpha_noop_supported(struct device *dev, u64 mask)
164 return mask < 0x00ffffffUL ? 0 : 1;
167 static int alpha_noop_set_mask(struct device *dev, u64 mask)
169 if (!dev->dma_mask || !dma_supported(dev, mask))
172 *dev->dma_mask = mask;
176 struct dma_map_ops alpha_noop_ops = {
177 .alloc_coherent = alpha_noop_alloc_coherent,
178 .free_coherent = alpha_noop_free_coherent,
179 .map_page = alpha_noop_map_page,
180 .map_sg = alpha_noop_map_sg,
181 .mapping_error = alpha_noop_mapping_error,
182 .dma_supported = alpha_noop_supported,
183 .set_dma_mask = alpha_noop_set_mask,
186 struct dma_map_ops *dma_ops = &alpha_noop_ops;
187 EXPORT_SYMBOL(dma_ops);
189 void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
194 void pci_iounmap(struct pci_dev *dev, void __iomem * addr)
198 EXPORT_SYMBOL(pci_iomap);
199 EXPORT_SYMBOL(pci_iounmap);