- David Miller: sparc and net updates. Fix merge_segments.

[davej-history.git] / arch / sparc / kernel / ioport.c

/* $Id: ioport.c,v 1.42 2000/12/05 00:56:36 anton Exp $
 * ioport.c:  Simple io mapping allocator.
 *
 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
 * Copyright (C) 1995 Miguel de Icaza (miguel@nuclecu.unam.mx)
 *
 * 1996: sparc_free_io, 1999: ioremap()/iounmap() by Pete Zaitcev.
 *
 * 2000/01/29
 * <rth> zait: as long as pci_alloc_consistent produces something addressable, 
 *      things are ok.
 * <zaitcev> rth: no, it is relevant, because get_free_pages returns you a
 *      pointer into the big page mapping
 * <rth> zait: so what?
 * <rth> zait: remap_it_my_way(virt_to_phys(get_free_page()))
 * <zaitcev> Hmm
 * <zaitcev> Suppose I did this remap_it_my_way(virt_to_phys(get_free_page())).
 *      So far so good.
 * <zaitcev> Now, driver calls pci_free_consistent(with result of
 *      remap_it_my_way()).
 * <zaitcev> How do you find the address to pass to free_pages()?
 * <rth> zait: walk the page tables?  It's only two or three level after all.
 * <rth> zait: you have to walk them anyway to remove the mapping.
 * <zaitcev> Hmm
 * <zaitcev> Sounds reasonable
 */

#include <linux/config.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/ioport.h>
#include <linux/mm.h>
#include <linux/malloc.h>
#include <linux/pci.h>          /* struct pci_dev */
#include <linux/proc_fs.h>

#include <asm/io.h>
#include <asm/vaddrs.h>
#include <asm/oplib.h>
#include <asm/page.h>
#include <asm/pgalloc.h>
#include <asm/pgtable.h>

#define mmu_inval_dma_area(p, l)        /* Anton pulled it out for 2.4.0-xx */

struct resource *_sparc_find_resource(struct resource *r, unsigned long);

static void *_sparc_ioremap(struct resource *res, u32 bus, u32 pa, int sz);
static void *_sparc_alloc_io(unsigned int busno, unsigned long phys,
    unsigned long size, char *name);
static void _sparc_free_io(struct resource *res);

/* This points to the next to use virtual memory for DVMA mappings */
static struct resource _sparc_dvma = {
        "sparc_dvma", DVMA_VADDR, DVMA_END - 1
};
/* This points to the start of I/O mappings, cluable from outside. */
/*ext*/ struct resource sparc_iomap = {
        "sparc_iomap", IOBASE_VADDR, IOBASE_END - 1
};

/*
 * BTFIXUP would do as well but it seems overkill for the case.
 */
static void (*_sparc_mapioaddr)(unsigned long pa, unsigned long va,
    int bus, int ro);
static void (*_sparc_unmapioaddr)(unsigned long va);

/*
 * Our mini-allocator...
 * Boy this is gross! We need it because we must map I/O for
 * timers and interrupt controller before the kmalloc is available.
 */

#define XNMLN  15
#define XNRES  10       /* SS-10 uses 8 */

struct xresource {
        struct resource xres;   /* Must be first */
        int xflag;              /* 1 == used */
        char xname[XNMLN+1];
};

static struct xresource xresv[XNRES];

static struct xresource *xres_alloc(void) {
        struct xresource *xrp;
        int n;

        xrp = xresv;
        for (n = 0; n < XNRES; n++) {
                if (xrp->xflag == 0) {
                        xrp->xflag = 1;
                        return xrp;
                }
                xrp++;
        }
        return NULL;
}

static void xres_free(struct xresource *xrp) {
        xrp->xflag = 0;
}

/*
 * These are typically used in PCI drivers
 * which are trying to be cross-platform.
 *
 * Bus type is always zero on IIep.
 */
void *ioremap(unsigned long offset, unsigned long size)
{
        char name[14];

        sprintf(name, "phys_%08x", (u32)offset);
        return _sparc_alloc_io(0, offset, size, name);
}

/*
 * Comlimentary to ioremap().
 */
void iounmap(void *virtual)
{
        unsigned long vaddr = (unsigned long) virtual & PAGE_MASK;
        struct resource *res;

        if ((res = _sparc_find_resource(&sparc_iomap, vaddr)) == NULL) {
                printk("free_io/iounmap: cannot free %lx\n", vaddr);
                return;
        }
        _sparc_free_io(res);

        if ((char *)res >= (char*)xresv && (char *)res < (char *)&xresv[XNRES]) {
                xres_free((struct xresource *)res);
        } else {
                kfree(res);
        }
}

/*
 */
unsigned long sbus_ioremap(struct resource *phyres, unsigned long offset,
    unsigned long size, char *name)
{
        return (unsigned long) _sparc_alloc_io(phyres->flags & 0xF,
            phyres->start + offset, size, name);
}

/*
 */
void sbus_iounmap(unsigned long addr, unsigned long size)
{
        iounmap((void *)addr);
}

/*
 * Meat of mapping
 */
static void *_sparc_alloc_io(unsigned int busno, unsigned long phys,
    unsigned long size, char *name)
{
        static int printed_full = 0;
        struct xresource *xres;
        struct resource *res;
        char *tack;
        int tlen;
        void *va;       /* P3 diag */

        if (name == NULL) name = "???";

        if ((xres = xres_alloc()) != 0) {
                tack = xres->xname;
                res = &xres->xres;
        } else {
                if (!printed_full) {
                        printk("ioremap: done with statics, switching to malloc\n");
                        printed_full = 1;
                }
                tlen = strlen(name);
                tack = kmalloc(sizeof (struct resource) + tlen + 1, GFP_KERNEL);
                if (tack == NULL) return NULL;
                memset(tack, 0, sizeof(struct resource));
                res = (struct resource *) tack;
                tack += sizeof (struct resource);
        }

        strncpy(tack, name, XNMLN);
        tack[XNMLN] = 0;
        res->name = tack;

        va = _sparc_ioremap(res, busno, phys, size);
        /* printk("ioremap(0x%x:%08lx[0x%lx])=%p\n", busno, phys, size, va); */ /* P3 diag */
        return va;
}

/*
 */
static void *
_sparc_ioremap(struct resource *res, u32 bus, u32 pa, int sz)
{
        unsigned long offset = ((unsigned long) pa) & (~PAGE_MASK);
        unsigned long va;
        unsigned int psz;

        if (allocate_resource(&sparc_iomap, res,
            (offset + sz + PAGE_SIZE-1) & PAGE_MASK,
            sparc_iomap.start, sparc_iomap.end, PAGE_SIZE, NULL, NULL) != 0) {
                /* Usually we cannot see printks in this case. */
                prom_printf("alloc_io_res(%s): cannot occupy\n",
                    (res->name != NULL)? res->name: "???");
                prom_halt();
        }

        va = res->start;
        pa &= PAGE_MASK;
        for (psz = res->end - res->start + 1; psz != 0; psz -= PAGE_SIZE) {
                (*_sparc_mapioaddr)(pa, va, bus, 0);
                va += PAGE_SIZE;
                pa += PAGE_SIZE;
        }

        /*
         * XXX Playing with implementation details here.
         * On sparc64 Ebus has resources with precise boundaries.
         * We share drivers with sparc64. Too clever drivers use
         * start of a resource instead of a base adress.
         *
         * XXX-2 This may be not valid anymore, clean when
         * interface to sbus_ioremap() is resolved.
         */
        res->start += offset;
        res->end = res->start + sz - 1;         /* not strictly necessary.. */

        return (void *) res->start;
}

/*
 * Comlimentary to _sparc_ioremap().
 */
static void _sparc_free_io(struct resource *res)
{
        unsigned long plen;

        plen = res->end - res->start + 1;
        plen = (plen + PAGE_SIZE-1) & PAGE_MASK;
        while (plen != 0) {
                plen -= PAGE_SIZE;
                (*_sparc_unmapioaddr)(res->start + plen);
        }

        release_resource(res);
}

#ifdef CONFIG_SBUS

void sbus_set_sbus64(struct sbus_dev *sdev, int x) {
        printk("sbus_set_sbus64: unsupported\n");
}

/*
 * Allocate a chunk of memory suitable for DMA.
 * Typically devices use them for control blocks.
 * CPU may access them without any explicit flushing.
 *
 * XXX Some clever people know that sdev is not used and supply NULL. Watch.
 */
void *sbus_alloc_consistent(struct sbus_dev *sdev, long len, u32 *dma_addrp)
{
        unsigned long len_total = (len + PAGE_SIZE-1) & PAGE_MASK;
        unsigned long va;
        struct resource *res;
        int order;

        /* XXX why are some lenghts signed, others unsigned? */
        if (len <= 0) {
                return NULL;
        }
        /* XXX So what is maxphys for us and how do drivers know it? */
        if (len > 256*1024) {                   /* __get_free_pages() limit */
                return NULL;
        }

        order = get_order(len_total);
        va = __get_free_pages(GFP_KERNEL, order);
        if (va == 0) {
                /*
                 * printk here may be flooding... Consider removal XXX.
                 */
                printk("sbus_alloc_consistent: no %ld pages\n", len_total>>PAGE_SHIFT);
                return NULL;
        }

        if ((res = kmalloc(sizeof(struct resource), GFP_KERNEL)) == NULL) {
                free_pages(va, order);
                printk("sbus_alloc_consistent: no core\n");
                return NULL;
        }
        memset((char*)res, 0, sizeof(struct resource));

        if (allocate_resource(&_sparc_dvma, res, len_total,
            _sparc_dvma.start, _sparc_dvma.end, PAGE_SIZE, NULL, NULL) != 0) {
                printk("sbus_alloc_consistent: cannot occupy 0x%lx", len_total);
                free_pages(va, order);
                kfree(res);
                return NULL;
        }

        mmu_map_dma_area(va, res->start, len_total);

        *dma_addrp = res->start;
        return (void *)res->start;
}

void sbus_free_consistent(struct sbus_dev *sdev, long n, void *p, u32 ba)
{
        struct resource *res;
        unsigned long pgp;

        if ((res = _sparc_find_resource(&_sparc_dvma,
            (unsigned long)p)) == NULL) {
                printk("sbus_free_consistent: cannot free %p\n", p);
                return;
        }

        if (((unsigned long)p & (PAGE_SIZE-1)) != 0) {
                printk("sbus_free_consistent: unaligned va %p\n", p);
                return;
        }

        n = (n + PAGE_SIZE-1) & PAGE_MASK;
        if ((res->end-res->start)+1 != n) {
                printk("sbus_free_consistent: region 0x%lx asked 0x%lx\n",
                    (long)((res->end-res->start)+1), n);
                return;
        }

        release_resource(res);
        kfree(res);

        /* mmu_inval_dma_area(va, n); */ /* it's consistent, isn't it */
        pgp = (unsigned long) phys_to_virt(mmu_translate_dvma(ba));
        mmu_unmap_dma_area(ba, n);

        free_pages(pgp, get_order(n));
}

/*
 * Map a chunk of memory so that devices can see it.
 * CPU view of this memory may be inconsistent with
 * a device view and explicit flushing is necessary.
 */
u32 sbus_map_single(struct sbus_dev *sdev, void *va, long len, int direction)
{
#if 0 /* This is the version that abuses consistent space */
        unsigned long len_total = (len + PAGE_SIZE-1) & PAGE_MASK;
        struct resource *res;

        /* XXX why are some lenghts signed, others unsigned? */
        if (len <= 0) {
                return 0;
        }
        /* XXX So what is maxphys for us and how do drivers know it? */
        if (len > 256*1024) {                   /* __get_free_pages() limit */
                return 0;
        }

        if ((res = kmalloc(sizeof(struct resource), GFP_KERNEL)) == NULL) {
                printk("sbus_map_single: no core\n");
                return 0;
        }
        memset((char*)res, 0, sizeof(struct resource));
        res->name = va; /* XXX */

        if (allocate_resource(&_sparc_dvma, res, len_total,
            _sparc_dvma.start, _sparc_dvma.end, PAGE_SIZE) != 0) {
                printk("sbus_map_single: cannot occupy 0x%lx", len);
                kfree(res);
                return 0;
        }

        mmu_map_dma_area(va, res->start, len_total);
        mmu_flush_dma_area((unsigned long)va, len_total); /* in all contexts? */

        return res->start;
#endif
#if 1 /* "trampoline" version */
        /* XXX why are some lenghts signed, others unsigned? */
        if (len <= 0) {
                return 0;
        }
        /* XXX So what is maxphys for us and how do drivers know it? */
        if (len > 256*1024) {                   /* __get_free_pages() limit */
                return 0;
        }
        return mmu_get_scsi_one(va, len, sdev->bus);
#endif
}

void sbus_unmap_single(struct sbus_dev *sdev, u32 ba, long n, int direction)
{
#if 0 /* This is the version that abuses consistent space */
        struct resource *res;
        unsigned long va;

        if ((res = _sparc_find_resource(&_sparc_dvma, ba)) == NULL) {
                printk("sbus_unmap_single: cannot find %08x\n", (unsigned)ba);
                return;
        }

        n = (n + PAGE_SIZE-1) & PAGE_MASK;
        if ((res->end-res->start)+1 != n) {
                printk("sbus_unmap_single: region 0x%lx asked 0x%lx\n",
                    (long)((res->end-res->start)+1), n);
                return;
        }

        va = (unsigned long) res->name; /* XXX Ouch */
        mmu_inval_dma_area(va, n);      /* in all contexts, mm's?... */
        mmu_unmap_dma_area(ba, n);      /* iounit cache flush is here */
        release_resource(res);
        kfree(res);
#endif
#if 1 /* "trampoline" version */
        mmu_release_scsi_one(ba, n, sdev->bus);
#endif
}

int sbus_map_sg(struct sbus_dev *sdev, struct scatterlist *sg, int n, int direction)
{
        mmu_get_scsi_sgl(sg, n, sdev->bus);

        /*
         * XXX sparc64 can return a partial length here. sun4c should do this
         * but it currently panics if it can't fulfill the request - Anton
         */
        return n;
}

void sbus_unmap_sg(struct sbus_dev *sdev, struct scatterlist *sg, int n, int direction)
{
        mmu_release_scsi_sgl(sg, n, sdev->bus);
}

/*
 */
void sbus_dma_sync_single(struct sbus_dev *sdev, u32 ba, long size, int direction)
{
#if 0
        unsigned long va;
        struct resource *res;

        /* We do not need the resource, just print a message if invalid. */
        res = _sparc_find_resource(&_sparc_dvma, ba);
        if (res == NULL)
                panic("sbus_dma_sync_single: 0x%x\n", ba);

        va = (unsigned long) phys_to_virt(mmu_translate_dvma(ba));
        /*
         * XXX This bogosity will be fixed with the iommu rewrite coming soon
         * to a kernel near you. - Anton
         */
        /* mmu_inval_dma_area(va, (size + PAGE_SIZE-1) & PAGE_MASK); */
#endif
}

void sbus_dma_sync_sg(struct sbus_dev *sdev, struct scatterlist *sg, int n, int direction)
{
        printk("sbus_dma_sync_sg: not implemented yet\n");
}
#endif /* CONFIG_SBUS */

#ifdef CONFIG_PCI

/* Allocate and map kernel buffer using consistent mode DMA for a device.
 * hwdev should be valid struct pci_dev pointer for PCI devices.
 */
void *pci_alloc_consistent(struct pci_dev *pdev, size_t len, dma_addr_t *pba)
{
        unsigned long len_total = (len + PAGE_SIZE-1) & PAGE_MASK;
        unsigned long va;
        struct resource *res;
        int order;

        if (len == 0) {
                return NULL;
        }
        if (len > 256*1024) {                   /* __get_free_pages() limit */
                return NULL;
        }

        order = get_order(len_total);
        va = __get_free_pages(GFP_KERNEL, order);
        if (va == 0) {
                printk("pci_alloc_consistent: no %ld pages\n", len_total>>PAGE_SHIFT);
                return NULL;
        }

        if ((res = kmalloc(sizeof(struct resource), GFP_KERNEL)) == NULL) {
                free_pages(va, order);
                printk("pci_alloc_consistent: no core\n");
                return NULL;
        }
        memset((char*)res, 0, sizeof(struct resource));

        if (allocate_resource(&_sparc_dvma, res, len_total,
            _sparc_dvma.start, _sparc_dvma.end, PAGE_SIZE, NULL, NULL) != 0) {
                printk("pci_alloc_consistent: cannot occupy 0x%lx", len_total);
                free_pages(va, order);
                kfree(res);
                return NULL;
        }

        mmu_inval_dma_area(va, len_total);

#if 1
/* P3 */ printk("pci_alloc_consistent: kva %lx uncva %lx phys %lx size %x\n",
  (long)va, (long)res->start, (long)virt_to_phys(va), len_total);
#endif
        {
                unsigned long xva, xpa;
                xva = res->start;
                xpa = virt_to_phys(va);
                while (len_total != 0) {
                        len_total -= PAGE_SIZE;
                        (*_sparc_mapioaddr)(xpa, xva, 0, 0);
                        xva += PAGE_SIZE;
                        xpa += PAGE_SIZE;
                }
        }

        *pba = virt_to_bus(va);
        return (void *) res->start;
}

/* Free and unmap a consistent DMA buffer.
 * cpu_addr is what was returned from pci_alloc_consistent,
 * size must be the same as what as passed into pci_alloc_consistent,
 * and likewise dma_addr must be the same as what *dma_addrp was set to.
 *
 * References to the memory and mappings assosciated with cpu_addr/dma_addr
 * past this call are illegal.
 */
void pci_free_consistent(struct pci_dev *pdev, size_t n, void *p, dma_addr_t ba)
{
        struct resource *res;
        unsigned long pgp;

        if ((res = _sparc_find_resource(&_sparc_dvma,
            (unsigned long)p)) == NULL) {
                printk("pci_free_consistent: cannot free %p\n", p);
                return;
        }

        if (((unsigned long)p & (PAGE_SIZE-1)) != 0) {
                printk("pci_free_consistent: unaligned va %p\n", p);
                return;
        }

        n = (n + PAGE_SIZE-1) & PAGE_MASK;
        if ((res->end-res->start)+1 != n) {
                printk("pci_free_consistent: region 0x%lx asked 0x%lx\n",
                    (long)((res->end-res->start)+1), (long)n);
                return;
        }

        pgp = (unsigned long) bus_to_virt(ba);
        mmu_inval_dma_area(pgp, n);
        {
                int x;
                for (x = 0; x < n; x += PAGE_SIZE) {
                        (*_sparc_unmapioaddr)((unsigned long)p + n);
                }
        }

        release_resource(res);
        kfree(res);

        free_pages(pgp, get_order(n));
}

/* Map a single buffer of the indicated size for DMA in streaming mode.
 * The 32-bit bus address to use is returned.
 *
 * Once the device is given the dma address, the device owns this memory
 * until either pci_unmap_single or pci_dma_sync_single is performed.
 */
dma_addr_t pci_map_single(struct pci_dev *hwdev, void *ptr, size_t size,
    int direction)
{
        if (direction == PCI_DMA_NONE)
                BUG();
        /* IIep is write-through, not flushing. */
        return virt_to_bus(ptr);
}

/* Unmap a single streaming mode DMA translation.  The dma_addr and size
 * must match what was provided for in a previous pci_map_single call.  All
 * other usages are undefined.
 *
 * After this call, reads by the cpu to the buffer are guarenteed to see
 * whatever the device wrote there.
 */
void pci_unmap_single(struct pci_dev *hwdev, dma_addr_t ba, size_t size,
    int direction)
{
        if (direction == PCI_DMA_NONE)
                BUG();
        if (direction != PCI_DMA_TODEVICE) {
                mmu_inval_dma_area((unsigned long)bus_to_virt(ba),
                    (size + PAGE_SIZE-1) & PAGE_MASK);
        }
}

/* Map a set of buffers described by scatterlist in streaming
 * mode for DMA.  This is the scather-gather version of the
 * above pci_map_single interface.  Here the scatter gather list
 * elements are each tagged with the appropriate dma address
 * and length.  They are obtained via sg_dma_{address,length}(SG).
 *
 * NOTE: An implementation may be able to use a smaller number of
 *       DMA address/length pairs than there are SG table elements.
 *       (for example via virtual mapping capabilities)
 *       The routine returns the number of addr/length pairs actually
 *       used, at most nents.
 *
 * Device ownership issues as mentioned above for pci_map_single are
 * the same here.
 */
int pci_map_sg(struct pci_dev *hwdev, struct scatterlist *sg, int nents,
    int direction)
{
        int n;

        if (direction == PCI_DMA_NONE)
                BUG();
        /* IIep is write-through, not flushing. */
        for (n = 0; n < nents; n++) {
                sg->dvma_address = virt_to_bus(sg->address);
                sg->dvma_length = sg->length;
                sg++;
        }
        return nents;
}

/* Unmap a set of streaming mode DMA translations.
 * Again, cpu read rules concerning calls here are the same as for
 * pci_unmap_single() above.
 */
void pci_unmap_sg(struct pci_dev *hwdev, struct scatterlist *sg, int nents,
    int direction)
{
        int n;

        if (direction == PCI_DMA_NONE)
                BUG();
        if (direction != PCI_DMA_TODEVICE) {
                for (n = 0; n < nents; n++) {
                        mmu_inval_dma_area((unsigned long)sg->address,
                            (sg->length + PAGE_SIZE-1) & PAGE_MASK);
                        sg++;
                }
        }
}

/* Make physical memory consistent for a single
 * streaming mode DMA translation before or after a transfer.
 *
 * If you perform a pci_map_single() but wish to interrogate the
 * buffer using the cpu, yet do not wish to teardown the PCI dma
 * mapping, you must call this function before doing so.  At the
 * next point you give the PCI dma address back to the card, the
 * device again owns the buffer.
 */
void pci_dma_sync_single(struct pci_dev *hwdev, dma_addr_t ba, size_t size, int direction)
{
        if (direction == PCI_DMA_NONE)
                BUG();
        if (direction != PCI_DMA_TODEVICE) {
                mmu_inval_dma_area((unsigned long)bus_to_virt(ba),
                    (size + PAGE_SIZE-1) & PAGE_MASK);
        }
}

/* Make physical memory consistent for a set of streaming
 * mode DMA translations after a transfer.
 *
 * The same as pci_dma_sync_single but for a scatter-gather list,
 * same rules and usage.
 */
void pci_dma_sync_sg(struct pci_dev *hwdev, struct scatterlist *sg, int nents, int direction)
{
        int n;

        if (direction == PCI_DMA_NONE)
                BUG();
        if (direction != PCI_DMA_TODEVICE) {
                for (n = 0; n < nents; n++) {
                        mmu_inval_dma_area((unsigned long)sg->address,
                            (sg->length + PAGE_SIZE-1) & PAGE_MASK);
                        sg++;
                }
        }
}
#endif CONFIG_PCI

#ifdef CONFIG_PROC_FS

static int
_sparc_io_get_info(char *buf, char **start, off_t fpos, int length, int *eof,
    void *data)
{
        char *p = buf, *e = buf + length;
        struct resource *r;
        const char *nm;

        for (r = ((struct resource *)data)->child; r != NULL; r = r->sibling) {
                if (p + 32 >= e)        /* Better than nothing */
                        break;
                if ((nm = r->name) == 0) nm = "???";
                p += sprintf(p, "%08lx-%08lx: %s\n", r->start, r->end, nm);
        }

        return p-buf;
}

#endif CONFIG_PROC_FS

/*
 * This is a version of find_resource and it belongs to kernel/resource.c.
 * Until we have agreement with Linus and Martin, it lingers here.
 *
 * XXX Too slow. Can have 8192 DVMA pages on sun4m in the worst case.
 * This probably warrants some sort of hashing.
 */
struct resource *
_sparc_find_resource(struct resource *root, unsigned long hit)
{
        struct resource *tmp;

        for (tmp = root->child; tmp != 0; tmp = tmp->sibling) {
                if (tmp->start <= hit && tmp->end >= hit)
                        return tmp;
        }
        return NULL;
}

/*
 * Necessary boot time initializations.
 */

void ioport_init(void)
{
        extern void sun4c_mapioaddr(unsigned long, unsigned long, int, int);
        extern void srmmu_mapioaddr(unsigned long, unsigned long, int, int);
        extern void sun4c_unmapioaddr(unsigned long);
        extern void srmmu_unmapioaddr(unsigned long);

        switch(sparc_cpu_model) {
        case sun4c:
        case sun4:
        case sun4e:
                _sparc_mapioaddr = sun4c_mapioaddr;
                _sparc_unmapioaddr = sun4c_unmapioaddr;
                break;
        case sun4m:
        case sun4d:
                _sparc_mapioaddr = srmmu_mapioaddr;
                _sparc_unmapioaddr = srmmu_unmapioaddr;
                break;
        default:
                printk("ioport_init: cpu type %d is unknown.\n",
                    sparc_cpu_model);
                halt();
        };

}

void register_proc_sparc_ioport(void)
{
#ifdef CONFIG_PROC_FS
        create_proc_read_entry("io_map",0,0,_sparc_io_get_info,&sparc_iomap);
        create_proc_read_entry("dvma_map",0,0,_sparc_io_get_info,&_sparc_dvma);
#endif
}