// SPDX-License-Identifier: GPL-2.0
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/*
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* linux/arch/alpha/kernel/pci-noop.c
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*
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* Stub PCI interfaces for Jensen-specific kernels.
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*/
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#include <linux/pci.h>
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#include <linux/init.h>
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#include <linux/memblock.h>
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#include <linux/gfp.h>
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#include <linux/capability.h>
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#include <linux/mm.h>
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#include <linux/errno.h>
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#include <linux/sched.h>
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#include <linux/dma-mapping.h>
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#include <linux/scatterlist.h>
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#include <linux/syscalls.h>
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#include "proto.h"
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/*
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* The PCI controller list.
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*/
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struct pci_controller *hose_head, **hose_tail = &hose_head;
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struct pci_controller *pci_isa_hose;
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struct pci_controller * __init
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alloc_pci_controller(void)
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{
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struct pci_controller *hose;
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hose = memblock_alloc(sizeof(*hose), SMP_CACHE_BYTES);
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if (!hose)
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panic("%s: Failed to allocate %zu bytes\n", __func__,
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sizeof(*hose));
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*hose_tail = hose;
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hose_tail = &hose->next;
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return hose;
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}
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struct resource * __init
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alloc_resource(void)
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{
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void *ptr = memblock_alloc(sizeof(struct resource), SMP_CACHE_BYTES);
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if (!ptr)
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panic("%s: Failed to allocate %zu bytes\n", __func__,
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sizeof(struct resource));
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return ptr;
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}
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SYSCALL_DEFINE3(pciconfig_iobase, long, which, unsigned long, bus,
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unsigned long, dfn)
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{
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struct pci_controller *hose;
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/* from hose or from bus.devfn */
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if (which & IOBASE_FROM_HOSE) {
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for (hose = hose_head; hose; hose = hose->next)
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if (hose->index == bus)
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break;
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if (!hose)
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return -ENODEV;
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} else {
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/* Special hook for ISA access. */
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if (bus == 0 && dfn == 0)
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hose = pci_isa_hose;
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else
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return -ENODEV;
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}
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switch (which & ~IOBASE_FROM_HOSE) {
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case IOBASE_HOSE:
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return hose->index;
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case IOBASE_SPARSE_MEM:
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return hose->sparse_mem_base;
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case IOBASE_DENSE_MEM:
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return hose->dense_mem_base;
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case IOBASE_SPARSE_IO:
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return hose->sparse_io_base;
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case IOBASE_DENSE_IO:
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return hose->dense_io_base;
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case IOBASE_ROOT_BUS:
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return hose->bus->number;
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}
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return -EOPNOTSUPP;
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}
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SYSCALL_DEFINE5(pciconfig_read, unsigned long, bus, unsigned long, dfn,
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unsigned long, off, unsigned long, len, void __user *, buf)
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{
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if (!capable(CAP_SYS_ADMIN))
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return -EPERM;
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else
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return -ENODEV;
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}
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SYSCALL_DEFINE5(pciconfig_write, unsigned long, bus, unsigned long, dfn,
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unsigned long, off, unsigned long, len, void __user *, buf)
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{
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if (!capable(CAP_SYS_ADMIN))
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return -EPERM;
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else
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return -ENODEV;
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}
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