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 #include <linux/scatterlist.h> 16 17 #include "proto.h" 18 19 20 /* 21 * The PCI controller list. 22 */ 23 24 struct pci_controller *hose_head, **hose_tail = &hose_head; 25 struct pci_controller *pci_isa_hose; 26 27 28 struct pci_controller * __init 29 alloc_pci_controller(void) 30 { 31 struct pci_controller *hose; 32 33 hose = alloc_bootmem(sizeof(*hose)); 34 35 *hose_tail = hose; 36 hose_tail = &hose->next; 37 38 return hose; 39 } 40 41 struct resource * __init 42 alloc_resource(void) 43 { 44 struct resource *res; 45 46 res = alloc_bootmem(sizeof(*res)); 47 48 return res; 49 } 50 51 asmlinkage long 52 sys_pciconfig_iobase(long which, unsigned long bus, unsigned long dfn) 53 { 54 struct pci_controller *hose; 55 56 /* from hose or from bus.devfn */ 57 if (which & IOBASE_FROM_HOSE) { 58 for (hose = hose_head; hose; hose = hose->next) 59 if (hose->index == bus) 60 break; 61 if (!hose) 62 return -ENODEV; 63 } else { 64 /* Special hook for ISA access. */ 65 if (bus == 0 && dfn == 0) 66 hose = pci_isa_hose; 67 else 68 return -ENODEV; 69 } 70 71 switch (which & ~IOBASE_FROM_HOSE) { 72 case IOBASE_HOSE: 73 return hose->index; 74 case IOBASE_SPARSE_MEM: 75 return hose->sparse_mem_base; 76 case IOBASE_DENSE_MEM: 77 return hose->dense_mem_base; 78 case IOBASE_SPARSE_IO: 79 return hose->sparse_io_base; 80 case IOBASE_DENSE_IO: 81 return hose->dense_io_base; 82 case IOBASE_ROOT_BUS: 83 return hose->bus->number; 84 } 85 86 return -EOPNOTSUPP; 87 } 88 89 asmlinkage long 90 sys_pciconfig_read(unsigned long bus, unsigned long dfn, 91 unsigned long off, unsigned long len, void *buf) 92 { 93 if (!capable(CAP_SYS_ADMIN)) 94 return -EPERM; 95 else 96 return -ENODEV; 97 } 98 99 asmlinkage long 100 sys_pciconfig_write(unsigned long bus, unsigned long dfn, 101 unsigned long off, unsigned long len, void *buf) 102 { 103 if (!capable(CAP_SYS_ADMIN)) 104 return -EPERM; 105 else 106 return -ENODEV; 107 } 108 109 /* Stubs for the routines in pci_iommu.c: */ 110 111 void * 112 pci_alloc_consistent(struct pci_dev *pdev, size_t size, dma_addr_t *dma_addrp) 113 { 114 return NULL; 115 } 116 117 void 118 pci_free_consistent(struct pci_dev *pdev, size_t size, void *cpu_addr, 119 dma_addr_t dma_addr) 120 { 121 } 122 123 dma_addr_t 124 pci_map_single(struct pci_dev *pdev, void *cpu_addr, size_t size, 125 int direction) 126 { 127 return (dma_addr_t) 0; 128 } 129 130 void 131 pci_unmap_single(struct pci_dev *pdev, dma_addr_t dma_addr, size_t size, 132 int direction) 133 { 134 } 135 136 int 137 pci_map_sg(struct pci_dev *pdev, struct scatterlist *sg, int nents, 138 int direction) 139 { 140 return 0; 141 } 142 143 void 144 pci_unmap_sg(struct pci_dev *pdev, struct scatterlist *sg, int nents, 145 int direction) 146 { 147 } 148 149 int 150 pci_dma_supported(struct pci_dev *hwdev, dma_addr_t mask) 151 { 152 return 0; 153 } 154 155 /* Generic DMA mapping functions: */ 156 157 void * 158 dma_alloc_coherent(struct device *dev, size_t size, 159 dma_addr_t *dma_handle, gfp_t gfp) 160 { 161 void *ret; 162 163 if (!dev || *dev->dma_mask >= 0xffffffffUL) 164 gfp &= ~GFP_DMA; 165 ret = (void *)__get_free_pages(gfp, get_order(size)); 166 if (ret) { 167 memset(ret, 0, size); 168 *dma_handle = virt_to_phys(ret); 169 } 170 return ret; 171 } 172 173 EXPORT_SYMBOL(dma_alloc_coherent); 174 175 int 176 dma_map_sg(struct device *dev, struct scatterlist *sgl, int nents, 177 enum dma_data_direction direction) 178 { 179 int i; 180 struct scatterlist *sg; 181 182 for_each_sg(sgl, sg, nents, i) { 183 void *va; 184 185 BUG_ON(!sg_page(sg)); 186 va = sg_virt(sg); 187 sg_dma_address(sg) = (dma_addr_t)virt_to_phys(va); 188 sg_dma_len(sg) = sg->length; 189 } 190 191 return nents; 192 } 193 194 EXPORT_SYMBOL(dma_map_sg); 195 196 int 197 dma_set_mask(struct device *dev, u64 mask) 198 { 199 if (!dev->dma_mask || !dma_supported(dev, mask)) 200 return -EIO; 201 202 *dev->dma_mask = mask; 203 204 return 0; 205 } 206 EXPORT_SYMBOL(dma_set_mask); 207 208 void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen) 209 { 210 return NULL; 211 } 212 213 void pci_iounmap(struct pci_dev *dev, void __iomem * addr) 214 { 215 } 216 217 EXPORT_SYMBOL(pci_iomap); 218 EXPORT_SYMBOL(pci_iounmap); 219