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 #include <linux/syscalls.h> 19 20 #include "proto.h" 21 22 23 /* 24 * The PCI controller list. 25 */ 26 27 struct pci_controller *hose_head, **hose_tail = &hose_head; 28 struct pci_controller *pci_isa_hose; 29 30 31 struct pci_controller * __init 32 alloc_pci_controller(void) 33 { 34 struct pci_controller *hose; 35 36 hose = alloc_bootmem(sizeof(*hose)); 37 38 *hose_tail = hose; 39 hose_tail = &hose->next; 40 41 return hose; 42 } 43 44 struct resource * __init 45 alloc_resource(void) 46 { 47 return alloc_bootmem(sizeof(struct resource)); 48 } 49 50 SYSCALL_DEFINE3(pciconfig_iobase, long, which, unsigned long, bus, 51 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 SYSCALL_DEFINE5(pciconfig_read, unsigned long, bus, unsigned long, dfn, 89 unsigned long, off, unsigned long, len, void __user *, buf) 90 { 91 if (!capable(CAP_SYS_ADMIN)) 92 return -EPERM; 93 else 94 return -ENODEV; 95 } 96 97 SYSCALL_DEFINE5(pciconfig_write, unsigned long, bus, unsigned long, dfn, 98 unsigned long, off, unsigned long, len, void __user *, buf) 99 { 100 if (!capable(CAP_SYS_ADMIN)) 101 return -EPERM; 102 else 103 return -ENODEV; 104 } 105 106 static void *alpha_noop_alloc_coherent(struct device *dev, size_t size, 107 dma_addr_t *dma_handle, gfp_t gfp, 108 unsigned long attrs) 109 { 110 void *ret; 111 112 if (!dev || *dev->dma_mask >= 0xffffffffUL) 113 gfp &= ~GFP_DMA; 114 ret = (void *)__get_free_pages(gfp, get_order(size)); 115 if (ret) { 116 memset(ret, 0, size); 117 *dma_handle = virt_to_phys(ret); 118 } 119 return ret; 120 } 121 122 static int alpha_noop_supported(struct device *dev, u64 mask) 123 { 124 return mask < 0x00ffffffUL ? 0 : 1; 125 } 126 127 const struct dma_map_ops alpha_noop_ops = { 128 .alloc = alpha_noop_alloc_coherent, 129 .free = dma_noop_free_coherent, 130 .map_page = dma_noop_map_page, 131 .map_sg = dma_noop_map_sg, 132 .mapping_error = dma_noop_mapping_error, 133 .dma_supported = alpha_noop_supported, 134 }; 135 136 const struct dma_map_ops *dma_ops = &alpha_noop_ops; 137 EXPORT_SYMBOL(dma_ops); 138