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, 113 dma_addr_t *dma_addrp, gfp_t gfp) 114 { 115 return NULL; 116 } 117 118 void 119 pci_free_consistent(struct pci_dev *pdev, size_t size, void *cpu_addr, 120 dma_addr_t dma_addr) 121 { 122 } 123 124 dma_addr_t 125 pci_map_single(struct pci_dev *pdev, void *cpu_addr, size_t size, 126 int direction) 127 { 128 return (dma_addr_t) 0; 129 } 130 131 void 132 pci_unmap_single(struct pci_dev *pdev, dma_addr_t dma_addr, size_t size, 133 int direction) 134 { 135 } 136 137 int 138 pci_map_sg(struct pci_dev *pdev, struct scatterlist *sg, int nents, 139 int direction) 140 { 141 return 0; 142 } 143 144 void 145 pci_unmap_sg(struct pci_dev *pdev, struct scatterlist *sg, int nents, 146 int direction) 147 { 148 } 149 150 int 151 pci_dma_supported(struct pci_dev *hwdev, dma_addr_t mask) 152 { 153 return 0; 154 } 155 156 /* Generic DMA mapping functions: */ 157 158 void * 159 dma_alloc_coherent(struct device *dev, size_t size, 160 dma_addr_t *dma_handle, gfp_t gfp) 161 { 162 void *ret; 163 164 if (!dev || *dev->dma_mask >= 0xffffffffUL) 165 gfp &= ~GFP_DMA; 166 ret = (void *)__get_free_pages(gfp, get_order(size)); 167 if (ret) { 168 memset(ret, 0, size); 169 *dma_handle = virt_to_phys(ret); 170 } 171 return ret; 172 } 173 174 EXPORT_SYMBOL(dma_alloc_coherent); 175 176 int 177 dma_map_sg(struct device *dev, struct scatterlist *sgl, int nents, 178 enum dma_data_direction direction) 179 { 180 int i; 181 struct scatterlist *sg; 182 183 for_each_sg(sgl, sg, nents, i) { 184 void *va; 185 186 BUG_ON(!sg_page(sg)); 187 va = sg_virt(sg); 188 sg_dma_address(sg) = (dma_addr_t)virt_to_phys(va); 189 sg_dma_len(sg) = sg->length; 190 } 191 192 return nents; 193 } 194 195 EXPORT_SYMBOL(dma_map_sg); 196 197 int 198 dma_set_mask(struct device *dev, u64 mask) 199 { 200 if (!dev->dma_mask || !dma_supported(dev, mask)) 201 return -EIO; 202 203 *dev->dma_mask = mask; 204 205 return 0; 206 } 207 EXPORT_SYMBOL(dma_set_mask); 208 209 void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen) 210 { 211 return NULL; 212 } 213 214 void pci_iounmap(struct pci_dev *dev, void __iomem * addr) 215 { 216 } 217 218 EXPORT_SYMBOL(pci_iomap); 219 EXPORT_SYMBOL(pci_iounmap); 220