xtensa: support ioremap for memory outside KIO region

Map physical memory outside KIO region into the vmalloc area.
Unmap it with vunmap.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>

diff --git a/arch/xtensa/include/asm/io.h b/arch/xtensa/include/asm/io.h
index 74fed0b..c38e5a7 100644 (file)
--- a/arch/xtensa/include/asm/io.h
+++ b/arch/xtensa/include/asm/io.h
@@ -25,9 +25,12 @@
 
 #ifdef CONFIG_MMU
 
+void __iomem *xtensa_ioremap_nocache(unsigned long addr, unsigned long size);
+void __iomem *xtensa_ioremap_cache(unsigned long addr, unsigned long size);
+void xtensa_iounmap(volatile void __iomem *addr);
+
 /*
  * Return the virtual address for the specified bus memory.
- * Note that we currently don't support any address outside the KIO segment.
  */
 static inline void __iomem *ioremap_nocache(unsigned long offset,
                unsigned long size)
@@ -36,7 +39,7 @@ static inline void __iomem *ioremap_nocache(unsigned long offset,
            && offset - XCHAL_KIO_PADDR < XCHAL_KIO_SIZE)
                return (void*)(offset-XCHAL_KIO_PADDR+XCHAL_KIO_BYPASS_VADDR);
        else
-               BUG();
+               return xtensa_ioremap_nocache(offset, size);
 }
 
 static inline void __iomem *ioremap_cache(unsigned long offset,
@@ -46,7 +49,7 @@ static inline void __iomem *ioremap_cache(unsigned long offset,
            && offset - XCHAL_KIO_PADDR < XCHAL_KIO_SIZE)
                return (void*)(offset-XCHAL_KIO_PADDR+XCHAL_KIO_CACHED_VADDR);
        else
-               BUG();
+               return xtensa_ioremap_cache(offset, size);
 }
 #define ioremap_cache ioremap_cache
 
@@ -60,6 +63,13 @@ static inline void __iomem *ioremap(unsigned long offset, unsigned long size)
 
 static inline void iounmap(volatile void __iomem *addr)
 {
+       unsigned long va = (unsigned long) addr;
+
+       if (!(va >= XCHAL_KIO_CACHED_VADDR &&
+             va - XCHAL_KIO_CACHED_VADDR < XCHAL_KIO_SIZE) &&
+           !(va >= XCHAL_KIO_BYPASS_VADDR &&
+             va - XCHAL_KIO_BYPASS_VADDR < XCHAL_KIO_SIZE))
+               xtensa_iounmap(addr);
 }
 
 #define virt_to_bus     virt_to_phys

diff --git a/arch/xtensa/mm/Makefile b/arch/xtensa/mm/Makefile
index e601e2f..0b3d296 100644 (file)
--- a/arch/xtensa/mm/Makefile
+++ b/arch/xtensa/mm/Makefile
@@ -3,5 +3,5 @@
 #
 
 obj-y                  := init.o misc.o
-obj-$(CONFIG_MMU)      += cache.o fault.o mmu.o tlb.o
+obj-$(CONFIG_MMU)      += cache.o fault.o ioremap.o mmu.o tlb.o
 obj-$(CONFIG_HIGHMEM)  += highmem.o

diff --git a/arch/xtensa/mm/ioremap.c b/arch/xtensa/mm/ioremap.c
new file mode 100644 (file)
index 0000000..d89c3c5
--- /dev/null
+++ b/arch/xtensa/mm/ioremap.c
@@ -0,0 +1,68 @@
+/*
+ * ioremap implementation.
+ *
+ * Copyright (C) 2015 Cadence Design Systems Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/io.h>
+#include <linux/vmalloc.h>
+#include <asm/cacheflush.h>
+#include <asm/io.h>
+#include <asm/pgtable.h>
+
+static void __iomem *xtensa_ioremap(unsigned long paddr, unsigned long size,
+                                   pgprot_t prot)
+{
+       unsigned long offset = paddr & ~PAGE_MASK;
+       unsigned long pfn = __phys_to_pfn(paddr);
+       struct vm_struct *area;
+       unsigned long vaddr;
+       int err;
+
+       paddr &= PAGE_MASK;
+
+       WARN_ON(pfn_valid(pfn));
+
+       size = PAGE_ALIGN(offset + size);
+
+       area = get_vm_area(size, VM_IOREMAP);
+       if (!area)
+               return NULL;
+
+       vaddr = (unsigned long)area->addr;
+       area->phys_addr = paddr;
+
+       err = ioremap_page_range(vaddr, vaddr + size, paddr, prot);
+
+       if (err) {
+               vunmap((void *)vaddr);
+               return NULL;
+       }
+
+       flush_cache_vmap(vaddr, vaddr + size);
+       return (void __iomem *)(offset + vaddr);
+}
+
+void __iomem *xtensa_ioremap_nocache(unsigned long addr, unsigned long size)
+{
+       return xtensa_ioremap(addr, size, pgprot_noncached(PAGE_KERNEL));
+}
+EXPORT_SYMBOL(xtensa_ioremap_nocache);
+
+void __iomem *xtensa_ioremap_cache(unsigned long addr, unsigned long size)
+{
+       return xtensa_ioremap(addr, size, PAGE_KERNEL);
+}
+EXPORT_SYMBOL(xtensa_ioremap_cache);
+
+void xtensa_iounmap(volatile void __iomem *io_addr)
+{
+       void *addr = (void *)(PAGE_MASK & (unsigned long)io_addr);
+
+       vunmap(addr);
+}
+EXPORT_SYMBOL(xtensa_iounmap);