summaryrefslogtreecommitdiff
path: root/arch/sparc/mm/io-unit.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/sparc/mm/io-unit.c')
-rw-r--r--arch/sparc/mm/io-unit.c63
1 files changed, 30 insertions, 33 deletions
diff --git a/arch/sparc/mm/io-unit.c b/arch/sparc/mm/io-unit.c
index f770ee7229d8..d409cb450de4 100644
--- a/arch/sparc/mm/io-unit.c
+++ b/arch/sparc/mm/io-unit.c
@@ -10,14 +10,12 @@
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/mm.h>
-#include <linux/highmem.h> /* pte_offset_map => kmap_atomic */
#include <linux/bitops.h>
-#include <linux/dma-mapping.h>
+#include <linux/dma-map-ops.h>
#include <linux/of.h>
-#include <linux/of_device.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
-#include <asm/pgalloc.h>
-#include <asm/pgtable.h>
#include <asm/io.h>
#include <asm/io-unit.h>
#include <asm/mxcc.h>
@@ -38,6 +36,8 @@
#define IOPERM (IOUPTE_CACHE | IOUPTE_WRITE | IOUPTE_VALID)
#define MKIOPTE(phys) __iopte((((phys)>>4) & IOUPTE_PAGE) | IOPERM)
+static const struct dma_map_ops iounit_dma_ops;
+
static void __init iounit_iommu_init(struct platform_device *op)
{
struct iounit_struct *iounit;
@@ -70,6 +70,8 @@ static void __init iounit_iommu_init(struct platform_device *op)
xptend = iounit->page_table + (16 * PAGE_SIZE) / sizeof(iopte_t);
for (; xpt < xptend; xpt++)
sbus_writel(0, xpt);
+
+ op->dev.dma_ops = &iounit_dma_ops;
}
static int __init iounit_init(void)
@@ -92,13 +94,14 @@ static int __init iounit_init(void)
subsys_initcall(iounit_init);
/* One has to hold iounit->lock to call this */
-static unsigned long iounit_get_area(struct iounit_struct *iounit, unsigned long vaddr, int size)
+static dma_addr_t iounit_get_area(struct iounit_struct *iounit,
+ phys_addr_t phys, int size)
{
int i, j, k, npages;
unsigned long rotor, scan, limit;
iopte_t iopte;
- npages = ((vaddr & ~PAGE_MASK) + size + (PAGE_SIZE-1)) >> PAGE_SHIFT;
+ npages = (offset_in_page(phys) + size + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
/* A tiny bit of magic ingredience :) */
switch (npages) {
@@ -107,7 +110,7 @@ static unsigned long iounit_get_area(struct iounit_struct *iounit, unsigned long
default: i = 0x0213; break;
}
- IOD(("iounit_get_area(%08lx,%d[%d])=", vaddr, size, npages));
+ IOD(("%s(%pa,%d[%d])=", __func__, &phys, size, npages));
next: j = (i & 15);
rotor = iounit->rotor[j - 1];
@@ -122,7 +125,8 @@ nexti: scan = find_next_zero_bit(iounit->bmap, limit, scan);
}
i >>= 4;
if (!(i & 15))
- panic("iounit_get_area: Couldn't find free iopte slots for (%08lx,%d)\n", vaddr, size);
+ panic("iounit_get_area: Couldn't find free iopte slots for (%pa,%d)\n",
+ &phys, size);
goto next;
}
for (k = 1, scan++; k < npages; k++)
@@ -130,30 +134,29 @@ nexti: scan = find_next_zero_bit(iounit->bmap, limit, scan);
goto nexti;
iounit->rotor[j - 1] = (scan < limit) ? scan : iounit->limit[j - 1];
scan -= npages;
- iopte = MKIOPTE(__pa(vaddr & PAGE_MASK));
- vaddr = IOUNIT_DMA_BASE + (scan << PAGE_SHIFT) + (vaddr & ~PAGE_MASK);
+ iopte = MKIOPTE(phys & PAGE_MASK);
+ phys = IOUNIT_DMA_BASE + (scan << PAGE_SHIFT) + offset_in_page(phys);
for (k = 0; k < npages; k++, iopte = __iopte(iopte_val(iopte) + 0x100), scan++) {
set_bit(scan, iounit->bmap);
sbus_writel(iopte_val(iopte), &iounit->page_table[scan]);
}
- IOD(("%08lx\n", vaddr));
- return vaddr;
+ IOD(("%pa\n", &phys));
+ return phys;
}
-static dma_addr_t iounit_map_page(struct device *dev, struct page *page,
- unsigned long offset, size_t len, enum dma_data_direction dir,
- unsigned long attrs)
+static dma_addr_t iounit_map_phys(struct device *dev, phys_addr_t phys,
+ size_t len, enum dma_data_direction dir, unsigned long attrs)
{
- void *vaddr = page_address(page) + offset;
struct iounit_struct *iounit = dev->archdata.iommu;
- unsigned long ret, flags;
+ unsigned long flags;
+ dma_addr_t ret;
/* XXX So what is maxphys for us and how do drivers know it? */
if (!len || len > 256 * 1024)
return DMA_MAPPING_ERROR;
spin_lock_irqsave(&iounit->lock, flags);
- ret = iounit_get_area(iounit, (unsigned long)vaddr, len);
+ ret = iounit_get_area(iounit, phys, len);
spin_unlock_irqrestore(&iounit->lock, flags);
return ret;
}
@@ -169,14 +172,15 @@ static int iounit_map_sg(struct device *dev, struct scatterlist *sgl, int nents,
/* FIXME: Cache some resolved pages - often several sg entries are to the same page */
spin_lock_irqsave(&iounit->lock, flags);
for_each_sg(sgl, sg, nents, i) {
- sg->dma_address = iounit_get_area(iounit, (unsigned long) sg_virt(sg), sg->length);
+ sg->dma_address =
+ iounit_get_area(iounit, sg_phys(sg), sg->length);
sg->dma_length = sg->length;
}
spin_unlock_irqrestore(&iounit->lock, flags);
return nents;
}
-static void iounit_unmap_page(struct device *dev, dma_addr_t vaddr, size_t len,
+static void iounit_unmap_phys(struct device *dev, dma_addr_t vaddr, size_t len,
enum dma_data_direction dir, unsigned long attrs)
{
struct iounit_struct *iounit = dev->archdata.iommu;
@@ -238,17 +242,15 @@ static void *iounit_alloc(struct device *dev, size_t len,
while(addr < end) {
page = va;
{
- pgd_t *pgdp;
pmd_t *pmdp;
pte_t *ptep;
long i;
- pgdp = pgd_offset(&init_mm, addr);
- pmdp = pmd_offset(pgdp, addr);
- ptep = pte_offset_map(pmdp, addr);
+ pmdp = pmd_off_k(addr);
+ ptep = pte_offset_kernel(pmdp, addr);
set_pte(ptep, mk_pte(virt_to_page(page), dvma_prot));
-
+
i = ((addr - IOUNIT_DMA_BASE) >> PAGE_SHIFT);
iopte = iounit->page_table + i;
@@ -279,13 +281,8 @@ static const struct dma_map_ops iounit_dma_ops = {
.alloc = iounit_alloc,
.free = iounit_free,
#endif
- .map_page = iounit_map_page,
- .unmap_page = iounit_unmap_page,
+ .map_phys = iounit_map_phys,
+ .unmap_phys = iounit_unmap_phys,
.map_sg = iounit_map_sg,
.unmap_sg = iounit_unmap_sg,
};
-
-void __init ld_mmu_iounit(void)
-{
- dma_ops = &iounit_dma_ops;
-}
generated by cgit (git 2.34.1) at 2025-12-24 22:55:04 +0000