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/gfp.h> 11 #include <linux/capability.h> 12 #include <linux/mm.h> 13 #include <linux/errno.h> 14 #include <linux/sched.h> 15 #include <linux/dma-mapping.h> 16 #include <linux/scatterlist.h> 17 18 #include "proto.h" 19 20 21 /* 22 * The PCI controller list. 23 */ 24 25 struct pci_controller *hose_head, **hose_tail = &hose_head; 26 struct pci_controller *pci_isa_hose; 27 28 29 struct pci_controller * __init 30 alloc_pci_controller(void) 31 { 32 struct pci_controller *hose; 33 34 hose = alloc_bootmem(sizeof(*hose)); 35 36 *hose_tail = hose; 37 hose_tail = &hose->next; 38 39 return hose; 40 } 41 42 struct resource * __init 43 alloc_resource(void) 44 { 45 struct resource *res; 46 47 res = alloc_bootmem(sizeof(*res)); 48 49 return res; 50 } 51 52 asmlinkage long 53 sys_pciconfig_iobase(long which, unsigned long bus, unsigned long dfn) 54 { 55 struct pci_controller *hose; 56 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) 61 break; 62 if (!hose) 63 return -ENODEV; 64 } else { 65 /* Special hook for ISA access. */ 66 if (bus == 0 && dfn == 0) 67 hose = pci_isa_hose; 68 else 69 return -ENODEV; 70 } 71 72 switch (which & ~IOBASE_FROM_HOSE) { 73 case IOBASE_HOSE: 74 return hose->index; 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; 81 case IOBASE_DENSE_IO: 82 return hose->dense_io_base; 83 case IOBASE_ROOT_BUS: 84 return hose->bus->number; 85 } 86 87 return -EOPNOTSUPP; 88 } 89 90 asmlinkage long 91 sys_pciconfig_read(unsigned long bus, unsigned long dfn, 92 unsigned long off, unsigned long len, void *buf) 93 { 94 if (!capable(CAP_SYS_ADMIN)) 95 return -EPERM; 96 else 97 return -ENODEV; 98 } 99 100 asmlinkage long 101 sys_pciconfig_write(unsigned long bus, unsigned long dfn, 102 unsigned long off, unsigned long len, void *buf) 103 { 104 if (!capable(CAP_SYS_ADMIN)) 105 return -EPERM; 106 else 107 return -ENODEV; 108 } 109 110 static void *alpha_noop_alloc_coherent(struct device *dev, size_t size, 111 dma_addr_t *dma_handle, gfp_t gfp, 112 struct dma_attrs *attrs) 113 { 114 void *ret; 115 116 if (!dev || *dev->dma_mask >= 0xffffffffUL) 117 gfp &= ~GFP_DMA; 118 ret = (void *)__get_free_pages(gfp, get_order(size)); 119 if (ret) { 120 memset(ret, 0, size); 121 *dma_handle = virt_to_phys(ret); 122 } 123 return ret; 124 } 125 126 static void alpha_noop_free_coherent(struct device *dev, size_t size, 127 void *cpu_addr, dma_addr_t dma_addr, 128 struct dma_attrs *attrs) 129 { 130 free_pages((unsigned long)cpu_addr, get_order(size)); 131 } 132 133 static dma_addr_t alpha_noop_map_page(struct device *dev, struct page *page, 134 unsigned long offset, size_t size, 135 enum dma_data_direction dir, 136 struct dma_attrs *attrs) 137 { 138 return page_to_pa(page) + offset; 139 } 140 141 static int alpha_noop_map_sg(struct device *dev, struct scatterlist *sgl, int nents, 142 enum dma_data_direction dir, struct dma_attrs *attrs) 143 { 144 int i; 145 struct scatterlist *sg; 146 147 for_each_sg(sgl, sg, nents, i) { 148 void *va; 149 150 BUG_ON(!sg_page(sg)); 151 va = sg_virt(sg); 152 sg_dma_address(sg) = (dma_addr_t)virt_to_phys(va); 153 sg_dma_len(sg) = sg->length; 154 } 155 156 return nents; 157 } 158 159 static int alpha_noop_mapping_error(struct device *dev, dma_addr_t dma_addr) 160 { 161 return 0; 162 } 163 164 static int alpha_noop_supported(struct device *dev, u64 mask) 165 { 166 return mask < 0x00ffffffUL ? 0 : 1; 167 } 168 169 struct dma_map_ops alpha_noop_ops = { 170 .alloc = alpha_noop_alloc_coherent, 171 .free = alpha_noop_free_coherent, 172 .map_page = alpha_noop_map_page, 173 .map_sg = alpha_noop_map_sg, 174 .mapping_error = alpha_noop_mapping_error, 175 .dma_supported = alpha_noop_supported, 176 }; 177 178 struct dma_map_ops *dma_ops = &alpha_noop_ops; 179 EXPORT_SYMBOL(dma_ops); 180