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