1 // SPDX-License-Identifier: GPL-2.0
3 * linux/arch/alpha/kernel/pci-noop.c
5 * Stub PCI interfaces for Jensen-specific kernels.
9 #include <linux/init.h>
10 #include <linux/memblock.h>
11 #include <linux/gfp.h>
12 #include <linux/capability.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>
24 * The PCI controller list.
27 struct pci_controller *hose_head, **hose_tail = &hose_head;
28 struct pci_controller *pci_isa_hose;
31 struct pci_controller * __init
32 alloc_pci_controller(void)
34 struct pci_controller *hose;
36 hose = memblock_alloc(sizeof(*hose), SMP_CACHE_BYTES);
38 panic("%s: Failed to allocate %zu bytes\n", __func__,
42 hose_tail = &hose->next;
47 struct resource * __init
50 void *ptr = memblock_alloc(sizeof(struct resource), SMP_CACHE_BYTES);
53 panic("%s: Failed to allocate %zu bytes\n", __func__,
54 sizeof(struct resource));
59 SYSCALL_DEFINE3(pciconfig_iobase, long, which, unsigned long, bus,
62 struct pci_controller *hose;
64 /* from hose or from bus.devfn */
65 if (which & IOBASE_FROM_HOSE) {
66 for (hose = hose_head; hose; hose = hose->next)
67 if (hose->index == bus)
72 /* Special hook for ISA access. */
73 if (bus == 0 && dfn == 0)
79 switch (which & ~IOBASE_FROM_HOSE) {
82 case IOBASE_SPARSE_MEM:
83 return hose->sparse_mem_base;
84 case IOBASE_DENSE_MEM:
85 return hose->dense_mem_base;
86 case IOBASE_SPARSE_IO:
87 return hose->sparse_io_base;
89 return hose->dense_io_base;
91 return hose->bus->number;
97 SYSCALL_DEFINE5(pciconfig_read, unsigned long, bus, unsigned long, dfn,
98 unsigned long, off, unsigned long, len, void __user *, buf)
100 if (!capable(CAP_SYS_ADMIN))
106 SYSCALL_DEFINE5(pciconfig_write, unsigned long, bus, unsigned long, dfn,
107 unsigned long, off, unsigned long, len, void __user *, buf)
109 if (!capable(CAP_SYS_ADMIN))