1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * linux/arch/alpha/kernel/pci-noop.c 4 * 5 * Stub PCI interfaces for Jensen-specific kernels. 6 */ 7 8 #include <linux/pci.h> 9 #include <linux/init.h> 10 #include <linux/bootmem.h> 11 #include <linux/gfp.h> 12 #include <linux/capability.h> 13 #include <linux/mm.h> 14 #include <linux/errno.h> 15 #include <linux/sched.h> 16 #include <linux/dma-mapping.h> 17 #include <linux/scatterlist.h> 18 19 #include "proto.h" 20 21 22 /* 23 * The PCI controller list. 24 */ 25 26 struct pci_controller *hose_head, **hose_tail = &hose_head; 27 struct pci_controller *pci_isa_hose; 28 29 30 struct pci_controller * __init 31 alloc_pci_controller(void) 32 { 33 struct pci_controller *hose; 34 35 hose = alloc_bootmem(sizeof(*hose)); 36 37 *hose_tail = hose; 38 hose_tail = &hose->next; 39 40 return hose; 41 } 42 43 struct resource * __init 44 alloc_resource(void) 45 { 46 return alloc_bootmem(sizeof(struct resource)); 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 static void *alpha_noop_alloc_coherent(struct device *dev, size_t size, 108 dma_addr_t *dma_handle, gfp_t gfp, 109 unsigned long attrs) 110 { 111 void *ret; 112 113 if (!dev || *dev->dma_mask >= 0xffffffffUL) 114 gfp &= ~GFP_DMA; 115 ret = (void *)__get_free_pages(gfp, get_order(size)); 116 if (ret) { 117 memset(ret, 0, size); 118 *dma_handle = virt_to_phys(ret); 119 } 120 return ret; 121 } 122 123 static int alpha_noop_supported(struct device *dev, u64 mask) 124 { 125 return mask < 0x00ffffffUL ? 0 : 1; 126 } 127 128 const struct dma_map_ops alpha_noop_ops = { 129 .alloc = alpha_noop_alloc_coherent, 130 .free = dma_noop_free_coherent, 131 .map_page = dma_noop_map_page, 132 .map_sg = dma_noop_map_sg, 133 .mapping_error = dma_noop_mapping_error, 134 .dma_supported = alpha_noop_supported, 135 }; 136 137 const struct dma_map_ops *dma_ops = &alpha_noop_ops; 138 EXPORT_SYMBOL(dma_ops); 139