sparc32: use DMA_DIRECT_REMAP

Use the generic dma remapping allocator instead of open coding it.
This also avoids setting up page tables from irq context which is
generally dangerous and uses the atomic pool instead.

Note that this changes the kernel virtual address at which the
dma coherent memory is mapped from the DVMA_VADDR region to the general
vmalloc pool.  I could not find any indication that this matters
for the hardware.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Tested-by: Andreas Larsson <andreas@gaisler.com>
Acked-by: David S. Miller <davem@davemloft.net>

diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index b120ed947f50b40d1b3b30c03796cea26057a7d8..66fc08646be5e5b446580004b77e67751cc9104e 100644 (file)
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -53,8 +53,9 @@ config SPARC32
        def_bool !64BIT
        select ARCH_32BIT_OFF_T
        select ARCH_HAS_SYNC_DMA_FOR_CPU
-       select GENERIC_ATOMIC64
        select CLZ_TAB
+       select DMA_DIRECT_REMAP
+       select GENERIC_ATOMIC64
        select HAVE_UID16
        select OLD_SIGACTION
        select ZONE_DMA

diff --git a/arch/sparc/kernel/ioport.c b/arch/sparc/kernel/ioport.c
index 3eb748e8622203b19867ce6a57223772209950f3..57a72c46eddb0c76f33a378a7d358a380989ca97 100644 (file)
--- a/arch/sparc/kernel/ioport.c
+++ b/arch/sparc/kernel/ioport.c
@@ -300,60 +300,6 @@ arch_initcall(sparc_register_ioport);
 
 #endif /* CONFIG_SBUS */
 
-
-/* Allocate and map kernel buffer using consistent mode DMA for a device.
- * hwdev should be valid struct pci_dev pointer for PCI devices.
- */
-void *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
-               gfp_t gfp, unsigned long attrs)
-{
-       unsigned long addr;
-       void *va;
-
-       if (!size || size > 256 * 1024) /* __get_free_pages() limit */
-               return NULL;
-
-       size = PAGE_ALIGN(size);
-       va = (void *) __get_free_pages(gfp | __GFP_ZERO, get_order(size));
-       if (!va) {
-               printk("%s: no %zd pages\n", __func__, size >> PAGE_SHIFT);
-               return NULL;
-       }
-
-       addr = sparc_dma_alloc_resource(dev, size);
-       if (!addr)
-               goto err_nomem;
-
-       srmmu_mapiorange(0, virt_to_phys(va), addr, size);
-
-       *dma_handle = virt_to_phys(va);
-       return (void *)addr;
-
-err_nomem:
-       free_pages((unsigned long)va, get_order(size));
-       return NULL;
-}
-
-/* Free and unmap a consistent DMA buffer.
- * cpu_addr is what was returned arch_dma_alloc, size must be the same as what
- * was passed into arch_dma_alloc, and likewise dma_addr must be the same as
- * what *dma_ndler was set to.
- *
- * References to the memory and mappings associated with cpu_addr/dma_addr
- * past this call are illegal.
- */
-void arch_dma_free(struct device *dev, size_t size, void *cpu_addr,
-               dma_addr_t dma_addr, unsigned long attrs)
-{
-       size = PAGE_ALIGN(size);
-
-       if (!sparc_dma_free_resource(cpu_addr, size))
-               return;
-
-       srmmu_unmapiorange((unsigned long)cpu_addr, size);
-       free_pages((unsigned long)phys_to_virt(dma_addr), get_order(size));
-}
-
 /*
  * IIep is write-through, not flushing on cpu to device transfer.
  *