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/*
* 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/gfp.h>
#include <linux/capability.h>
#include <linux/mm.h>
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/dma-mapping.h>
#include <linux/scatterlist.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;
/* 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;
}
static void *alpha_noop_alloc_coherent(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t gfp,
struct dma_attrs *attrs)
{
void *ret;
if (!dev || *dev->dma_mask >= 0xffffffffUL)
gfp &= ~GFP_DMA;
ret = (void *)__get_free_pages(gfp, get_order(size));
if (ret) {
memset(ret, 0, size);
*dma_handle = virt_to_phys(ret);
}
return ret;
}
static void alpha_noop_free_coherent(struct device *dev, size_t size,
void *cpu_addr, dma_addr_t dma_addr,
struct dma_attrs *attrs)
{
free_pages((unsigned long)cpu_addr, get_order(size));
}
static dma_addr_t alpha_noop_map_page(struct device *dev, struct page *page,
unsigned long offset, size_t size,
enum dma_data_direction dir,
struct dma_attrs *attrs)
{
return page_to_pa(page) + offset;
}
static int alpha_noop_map_sg(struct device *dev, struct scatterlist *sgl, int nents,
enum dma_data_direction dir, struct dma_attrs *attrs)
{
int i;
struct scatterlist *sg;
for_each_sg(sgl, sg, nents, i) {
void *va;
BUG_ON(!sg_page(sg));
va = sg_virt(sg);
sg_dma_address(sg) = (dma_addr_t)virt_to_phys(va);
sg_dma_len(sg) = sg->length;
}
return nents;
}
static int alpha_noop_mapping_error(struct device *dev, dma_addr_t dma_addr)
{
return 0;
}
static int alpha_noop_supported(struct device *dev, u64 mask)
{
return mask < 0x00ffffffUL ? 0 : 1;
}
static int alpha_noop_set_mask(struct device *dev, u64 mask)
{
if (!dev->dma_mask || !dma_supported(dev, mask))
return -EIO;
*dev->dma_mask = mask;
return 0;
}
struct dma_map_ops alpha_noop_ops = {
.alloc = alpha_noop_alloc_coherent,
.free = alpha_noop_free_coherent,
.map_page = alpha_noop_map_page,
.map_sg = alpha_noop_map_sg,
.mapping_error = alpha_noop_mapping_error,
.dma_supported = alpha_noop_supported,
.set_dma_mask = alpha_noop_set_mask,
};
struct dma_map_ops *dma_ops = &alpha_noop_ops;
EXPORT_SYMBOL(dma_ops);
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