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 23 struct pci_controller *hose_head, **hose_tail = &hose_head; 24 struct pci_controller *pci_isa_hose; 25 26 27 struct pci_controller * __init 28 alloc_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 40 struct resource * __init 41 alloc_resource(void) 42 { 43 struct resource *res; 44 45 res = alloc_bootmem(sizeof(*res)); 46 47 return res; 48 } 49 50 asmlinkage long 51 sys_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 88 asmlinkage long 89 sys_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 98 asmlinkage long 99 sys_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: */ 109 110 void * 111 pci_alloc_consistent(struct pci_dev *pdev, size_t size, dma_addr_t *dma_addrp) 112 { 113 return NULL; 114 } 115 116 void 117 pci_free_consistent(struct pci_dev *pdev, size_t size, void *cpu_addr, 118 dma_addr_t dma_addr) 119 { 120 } 121 122 dma_addr_t 123 pci_map_single(struct pci_dev *pdev, void *cpu_addr, size_t size, 124 int direction) 125 { 126 return (dma_addr_t) 0; 127 } 128 129 void 130 pci_unmap_single(struct pci_dev *pdev, dma_addr_t dma_addr, size_t size, 131 int direction) 132 { 133 } 134 135 int 136 pci_map_sg(struct pci_dev *pdev, struct scatterlist *sg, int nents, 137 int direction) 138 { 139 return 0; 140 } 141 142 void 143 pci_unmap_sg(struct pci_dev *pdev, struct scatterlist *sg, int nents, 144 int direction) 145 { 146 } 147 148 int 149 pci_dma_supported(struct pci_dev *hwdev, dma_addr_t mask) 150 { 151 return 0; 152 } 153 154 /* Generic DMA mapping functions: */ 155 156 void * 157 dma_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 } 171 172 EXPORT_SYMBOL(dma_alloc_coherent); 173 174 int 175 dma_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 } 191 192 EXPORT_SYMBOL(dma_map_sg); 193 194 int 195 dma_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 } 204 EXPORT_SYMBOL(dma_set_mask); 205 206 void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen) 207 { 208 return NULL; 209 } 210 211 void pci_iounmap(struct pci_dev *dev, void __iomem * addr) 212 { 213 } 214 215 EXPORT_SYMBOL(pci_iomap); 216 EXPORT_SYMBOL(pci_iounmap); 217