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/memblock.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 = memblock_alloc(sizeof(*hose), SMP_CACHE_BYTES); 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 memblock_alloc(sizeof(struct resource), SMP_CACHE_BYTES); 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