pci-noop.c
上传用户:lgb322
上传日期:2013-02-24
资源大小:30529k
文件大小:3k
- /*
- * linux/arch/alpha/kernel/pci-noop.c
- *
- * Stub PCI interfaces for Jensen-specific kernels.
- */
- #include <linux/pci.h>
- #include <linux/init.h>
- #include <linux/bootmem.h>
- #include <linux/errno.h>
- #include <linux/sched.h>
- #include "proto.h"
- /*
- * The PCI controller list.
- */
- struct pci_controller *hose_head, **hose_tail = &hose_head;
- struct pci_controller *pci_isa_hose;
- struct pci_controller * __init
- alloc_pci_controller(void)
- {
- struct pci_controller *hose;
- hose = alloc_bootmem(sizeof(*hose));
- *hose_tail = hose;
- hose_tail = &hose->next;
- return hose;
- }
- struct resource * __init
- alloc_resource(void)
- {
- struct resource *res;
- res = alloc_bootmem(sizeof(*res));
- return res;
- }
- asmlinkage long
- sys_pciconfig_iobase(long which, unsigned long bus, unsigned long dfn)
- {
- struct pci_controller *hose;
- struct pci_dev *dev;
- /* from hose or from bus.devfn */
- if (which & IOBASE_FROM_HOSE) {
- for (hose = hose_head; hose; hose = hose->next)
- if (hose->index == bus)
- break;
- if (!hose)
- return -ENODEV;
- } else {
- /* Special hook for ISA access. */
- if (bus == 0 && dfn == 0)
- hose = pci_isa_hose;
- else
- return -ENODEV;
- }
- switch (which & ~IOBASE_FROM_HOSE) {
- case IOBASE_HOSE:
- return hose->index;
- case IOBASE_SPARSE_MEM:
- return hose->sparse_mem_base;
- case IOBASE_DENSE_MEM:
- return hose->dense_mem_base;
- case IOBASE_SPARSE_IO:
- return hose->sparse_io_base;
- case IOBASE_DENSE_IO:
- return hose->dense_io_base;
- case IOBASE_ROOT_BUS:
- return hose->bus->number;
- }
- return -EOPNOTSUPP;
- }
- asmlinkage long
- sys_pciconfig_read(unsigned long bus, unsigned long dfn,
- unsigned long off, unsigned long len, void *buf)
- {
- if (!capable(CAP_SYS_ADMIN))
- return -EPERM;
- else
- return -ENODEV;
- }
- asmlinkage long
- sys_pciconfig_write(unsigned long bus, unsigned long dfn,
- unsigned long off, unsigned long len, void *buf)
- {
- if (!capable(CAP_SYS_ADMIN))
- return -EPERM;
- else
- return -ENODEV;
- }
- /* stubs for the routines in pci_iommu.c */
- void *
- pci_alloc_consistent(struct pci_dev *pdev, size_t size, dma_addr_t *dma_addrp)
- {
- return (void *)0;
- }
- void
- pci_free_consistent(struct pci_dev *pdev, size_t size, void *cpu_addr,
- dma_addr_t dma_addr)
- {
- }
- dma_addr_t
- pci_map_single(struct pci_dev *pdev, void *cpu_addr, size_t size,
- int direction)
- {
- return (dma_addr_t)0;
- }
- void
- pci_unmap_single(struct pci_dev *pdev, dma_addr_t dma_addr, size_t size,
- int direction)
- {
- }
- int
- pci_map_sg(struct pci_dev *pdev, struct scatterlist *sg, int nents,
- int direction)
- {
- return 0;
- }
- void
- pci_unmap_sg(struct pci_dev *pdev, struct scatterlist *sg, int nents,
- int direction)
- {
- }
- int
- pci_dma_supported(struct pci_dev *hwdev, dma_addr_t mask)
- {
- return 0;
- }