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ioport.c

/* $Id: ioport.c,v 1.45 2001/10/30 04:54:21 davem 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/module.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/slab.h>
#include <linux/pci.h>        /* struct pci_dev */
#include <linux/proc_fs.h>
#include <linux/scatterlist.h>

#include <asm/io.h>
#include <asm/vaddrs.h>
#include <asm/oplib.h>
#include <asm/prom.h>
#include <asm/of_device.h>
#include <asm/sbus.h>
#include <asm/page.h>
#include <asm/pgalloc.h>
#include <asm/dma.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 __iomem *_sparc_ioremap(struct resource *res, u32 bus, u32 pa, int sz);
static void __iomem *_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 = {
      .name = "sparc_dvma", .start = DVMA_VADDR, .end = DVMA_END - 1
};
/* This points to the start of I/O mappings, cluable from outside. */
/*ext*/ struct resource sparc_iomap = {
      .name = "sparc_iomap", .start = IOBASE_VADDR, .end = IOBASE_END - 1
};

/*
 * 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 __iomem *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(volatile void __iomem *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);
      }
}

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

void __iomem *of_ioremap(struct resource *res, unsigned long offset,
                   unsigned long size, char *name)
{
      return _sparc_alloc_io(res->flags & 0xF,
                         res->start + offset,
                         size, name);
}
EXPORT_SYMBOL(of_ioremap);

void of_iounmap(struct resource *res, void __iomem *base, unsigned long size)
{
      iounmap(base);
}
EXPORT_SYMBOL(of_iounmap);

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

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

      strlcpy(tack, name, XNMLN+1);
      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 __iomem *
_sparc_ioremap(struct resource *res, u32 bus, u32 pa, int sz)
{
      unsigned long offset = ((unsigned long) pa) & (~PAGE_MASK);

      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();
      }

      pa &= PAGE_MASK;
      sparc_mapiorange(bus, pa, res->start, res->end - res->start + 1);

      return (void __iomem *)(unsigned long)(res->start + offset);
}

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

      plen = res->end - res->start + 1;
      BUG_ON((plen & (PAGE_SIZE-1)) != 0);
      sparc_unmapiorange(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");
}

extern unsigned int sun4d_build_irq(struct sbus_dev *sdev, int irq);
void __init sbus_fill_device_irq(struct sbus_dev *sdev)
{
      struct linux_prom_irqs irqs[PROMINTR_MAX];
      int len;

      len = prom_getproperty(sdev->prom_node, "intr",
                         (char *)irqs, sizeof(irqs));
      if (len != -1) {
            sdev->num_irqs = len / 8;
            if (sdev->num_irqs == 0) {
                  sdev->irqs[0] = 0;
            } else if (sparc_cpu_model == sun4d) {
                  for (len = 0; len < sdev->num_irqs; len++)
                        sdev->irqs[len] =
                              sun4d_build_irq(sdev, irqs[len].pri);
            } else {
                  for (len = 0; len < sdev->num_irqs; len++)
                        sdev->irqs[len] = irqs[len].pri;
            }
      } else {
            int interrupts[PROMINTR_MAX];

            /* No "intr" node found-- check for "interrupts" node.
             * This node contains SBus interrupt levels, not IPLs
             * as in "intr", and no vector values.  We convert
             * SBus interrupt levels to PILs (platform specific).
             */
            len = prom_getproperty(sdev->prom_node, "interrupts",
                               (char *)interrupts, sizeof(interrupts));
            if (len == -1) {
                  sdev->irqs[0] = 0;
                  sdev->num_irqs = 0;
            } else {
                  sdev->num_irqs = len / sizeof(int);
                  for (len = 0; len < sdev->num_irqs; len++) {
                        sdev->irqs[len] =
                              sbint_to_irq(sdev, interrupts[len]);
                  }
            }
      } 
}

/*
 * 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);
      if ((va = __get_free_pages(GFP_KERNEL|__GFP_COMP, order)) == 0)
            goto err_nopages;

      if ((res = kzalloc(sizeof(struct resource), GFP_KERNEL)) == NULL)
            goto err_nomem;

      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);
            goto err_nova;
      }
      mmu_inval_dma_area(va, len_total);
      // XXX The mmu_map_dma_area does this for us below, see comments.
      // sparc_mapiorange(0, virt_to_phys(va), res->start, len_total);
      /*
       * XXX That's where sdev would be used. Currently we load
       * all iommu tables with the same translations.
       */
      if (mmu_map_dma_area(dma_addrp, va, res->start, len_total) != 0)
            goto err_noiommu;

      /* Set the resource name, if known. */
      if (sdev) {
            res->name = sdev->prom_name;
      }

      return (void *)(unsigned long)res->start;

err_noiommu:
      release_resource(res);
err_nova:
      free_pages(va, order);
err_nomem:
      kfree(res);
err_nopages:
      return NULL;
}

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

      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 */
      pgv = mmu_translate_dvma(ba);
      mmu_unmap_dma_area(ba, n);

      __free_pages(pgv, 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.
 */
dma_addr_t sbus_map_single(struct sbus_dev *sdev, void *va, size_t len, int direction)
{
      /* 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);
}

void sbus_unmap_single(struct sbus_dev *sdev, dma_addr_t ba, size_t n, int direction)
{
      mmu_release_scsi_one(ba, n, sdev->bus);
}

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_for_cpu(struct sbus_dev *sdev, dma_addr_t ba, size_t 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 = page_address(mmu_translate_dvma(ba)); /* XXX higmem */
      /*
       * 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_single_for_device(struct sbus_dev *sdev, dma_addr_t ba, size_t 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 = page_address(mmu_translate_dvma(ba)); /* XXX higmem */
      /*
       * 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_for_cpu(struct sbus_dev *sdev, struct scatterlist *sg, int n, int direction)
{
      printk("sbus_dma_sync_sg_for_cpu: not implemented yet\n");
}

void sbus_dma_sync_sg_for_device(struct sbus_dev *sdev, struct scatterlist *sg, int n, int direction)
{
      printk("sbus_dma_sync_sg_for_device: not implemented yet\n");
}

/* Support code for sbus_init().  */
/*
 * XXX This functions appears to be a distorted version of
 * prom_sbus_ranges_init(), with all sun4d stuff cut away.
 * Ask DaveM what is going on here, how is sun4d supposed to work... XXX
 */
/* added back sun4d patch from Thomas Bogendoerfer - should be OK (crn) */
void __init sbus_arch_bus_ranges_init(struct device_node *pn, struct sbus_bus *sbus)
{
      int parent_node = pn->node;

      if (sparc_cpu_model == sun4d) {
            struct linux_prom_ranges iounit_ranges[PROMREG_MAX];
            int num_iounit_ranges, len;

            len = prom_getproperty(parent_node, "ranges",
                               (char *) iounit_ranges,
                               sizeof (iounit_ranges));
            if (len != -1) {
                  num_iounit_ranges =
                        (len / sizeof(struct linux_prom_ranges));
                  prom_adjust_ranges(sbus->sbus_ranges,
                                 sbus->num_sbus_ranges,
                                 iounit_ranges, num_iounit_ranges);
            }
      }
}

void __init sbus_setup_iommu(struct sbus_bus *sbus, struct device_node *dp)
{
#ifndef CONFIG_SUN4
      struct device_node *parent = dp->parent;

      if (sparc_cpu_model != sun4d &&
          parent != NULL &&
          !strcmp(parent->name, "iommu")) {
            extern void iommu_init(int iommu_node, struct sbus_bus *sbus);

            iommu_init(parent->node, sbus);
      }

      if (sparc_cpu_model == sun4d) {
            extern void iounit_init(int sbi_node, int iounit_node,
                              struct sbus_bus *sbus);

            iounit_init(dp->node, parent->node, sbus);
      }
#endif
}

void __init sbus_setup_arch_props(struct sbus_bus *sbus, struct device_node *dp)
{
      if (sparc_cpu_model == sun4d) {
            struct device_node *parent = dp->parent;

            sbus->devid = of_getintprop_default(parent, "device-id", 0);
            sbus->board = of_getintprop_default(parent, "board#", 0);
      }
}

int __init sbus_arch_preinit(void)
{
      extern void register_proc_sparc_ioport(void);

      register_proc_sparc_ioport();

#ifdef CONFIG_SUN4
      {
            extern void sun4_dvma_init(void);
            sun4_dvma_init();
      }
      return 1;
#else
      return 0;
#endif
}

void __init sbus_arch_postinit(void)
{
      if (sparc_cpu_model == sun4d) {
            extern void sun4d_init_sbi_irq(void);
            sun4d_init_sbi_irq();
      }
}
#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 = kzalloc(sizeof(struct resource), GFP_KERNEL)) == NULL) {
            free_pages(va, order);
            printk("pci_alloc_consistent: no core\n");
            return NULL;
      }

      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 0
/* P3 */ printk("pci_alloc_consistent: kva %lx uncva %lx phys %lx size %lx\n",
  (long)va, (long)res->start, (long)virt_to_phys(va), len_total);
#endif
      sparc_mapiorange(0, virt_to_phys(va), res->start, len_total);

      *pba = virt_to_phys(va); /* equals virt_to_bus (R.I.P.) for us. */
      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 associated 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) phys_to_virt(ba);   /* bus_to_virt actually */
      mmu_inval_dma_area(pgp, n);
      sparc_unmapiorange((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)
{
      BUG_ON(direction == PCI_DMA_NONE);
      /* IIep is write-through, not flushing. */
      return virt_to_phys(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 guaranteed to see
 * whatever the device wrote there.
 */
void pci_unmap_single(struct pci_dev *hwdev, dma_addr_t ba, size_t size,
    int direction)
{
      BUG_ON(direction == PCI_DMA_NONE);
      if (direction != PCI_DMA_TODEVICE) {
            mmu_inval_dma_area((unsigned long)phys_to_virt(ba),
                (size + PAGE_SIZE-1) & PAGE_MASK);
      }
}

/*
 * Same as pci_map_single, but with pages.
 */
dma_addr_t pci_map_page(struct pci_dev *hwdev, struct page *page,
                  unsigned long offset, size_t size, int direction)
{
      BUG_ON(direction == PCI_DMA_NONE);
      /* IIep is write-through, not flushing. */
      return page_to_phys(page) + offset;
}

void pci_unmap_page(struct pci_dev *hwdev,
                  dma_addr_t dma_address, size_t size, int direction)
{
      BUG_ON(direction == PCI_DMA_NONE);
      /* mmu_inval_dma_area XXX */
}

/* 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 *sgl, int nents,
    int direction)
{
      struct scatterlist *sg;
      int n;

      BUG_ON(direction == PCI_DMA_NONE);
      /* IIep is write-through, not flushing. */
      for_each_sg(sgl, sg, nents, n) {
            BUG_ON(page_address(sg_page(sg)) == NULL);
            sg->dvma_address = virt_to_phys(sg_virt(sg));
            sg->dvma_length = sg->length;
      }
      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 *sgl, int nents,
    int direction)
{
      struct scatterlist *sg;
      int n;

      BUG_ON(direction == PCI_DMA_NONE);
      if (direction != PCI_DMA_TODEVICE) {
            for_each_sg(sgl, sg, nents, n) {
                  BUG_ON(page_address(sg_page(sg)) == NULL);
                  mmu_inval_dma_area(
                      (unsigned long) page_address(sg_page(sg)),
                      (sg->length + PAGE_SIZE-1) & PAGE_MASK);
            }
      }
}

/* 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, you
 * must first perform a pci_dma_sync_for_device, and then the
 * device again owns the buffer.
 */
void pci_dma_sync_single_for_cpu(struct pci_dev *hwdev, dma_addr_t ba, size_t size, int direction)
{
      BUG_ON(direction == PCI_DMA_NONE);
      if (direction != PCI_DMA_TODEVICE) {
            mmu_inval_dma_area((unsigned long)phys_to_virt(ba),
                (size + PAGE_SIZE-1) & PAGE_MASK);
      }
}

void pci_dma_sync_single_for_device(struct pci_dev *hwdev, dma_addr_t ba, size_t size, int direction)
{
      BUG_ON(direction == PCI_DMA_NONE);
      if (direction != PCI_DMA_TODEVICE) {
            mmu_inval_dma_area((unsigned long)phys_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_for_cpu(struct pci_dev *hwdev, struct scatterlist *sgl, int nents, int direction)
{
      struct scatterlist *sg;
      int n;

      BUG_ON(direction == PCI_DMA_NONE);
      if (direction != PCI_DMA_TODEVICE) {
            for_each_sg(sgl, sg, nents, n) {
                  BUG_ON(page_address(sg_page(sg)) == NULL);
                  mmu_inval_dma_area(
                      (unsigned long) page_address(sg_page(sg)),
                      (sg->length + PAGE_SIZE-1) & PAGE_MASK);
            }
      }
}

void pci_dma_sync_sg_for_device(struct pci_dev *hwdev, struct scatterlist *sgl, int nents, int direction)
{
      struct scatterlist *sg;
      int n;

      BUG_ON(direction == PCI_DMA_NONE);
      if (direction != PCI_DMA_TODEVICE) {
            for_each_sg(sgl, sg, nents, n) {
                  BUG_ON(page_address(sg_page(sg)) == NULL);
                  mmu_inval_dma_area(
                      (unsigned long) page_address(sg_page(sg)),
                      (sg->length + PAGE_SIZE-1) & PAGE_MASK);
            }
      }
}
#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, "%016llx-%016llx: %s\n",
                        (unsigned long long)r->start,
                        (unsigned long long)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;
}

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

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