[PATCH] cleanup hardcoding __pa/__va macros etc.

[girish <girishvg@gmail.com>]

hello.

here is a patch to cleanup some hard coded lines.
plese let me know if these are valid changes.

thanks.


diff -uprN -X linux-vanilla/Documentation/dontdiff
linux-vanilla/arch/mips/mm/dma-noncoherent.c
linux/arch/mips/mm/dma-noncoherent.c
--- linux-vanilla/arch/mips/mm/dma-noncoherent.c        2006-09-24
12:22:46.000000000 +0900
+++ linux/arch/mips/mm/dma-noncoherent.c        2006-09-24 12:20:35.000000000 
+0900
@@ -334,7 +334,7 @@ EXPORT_SYMBOL(pci_dac_page_to_dma);
struct page *pci_dac_dma_to_page(struct pci_dev *pdev,
        dma64_addr_t dma_addr)
{
-       return mem_map + (dma_addr >> PAGE_SHIFT);
+       return pfn_to_page (dma_addr >> PAGE_SHIFT);
}

EXPORT_SYMBOL(pci_dac_dma_to_page);
diff -uprN -X linux-vanilla/Documentation/dontdiff
linux-vanilla/arch/mips/mm/init.c linux/arch/mips/mm/init.c
--- linux-vanilla/arch/mips/mm/init.c   2006-09-24 12:22:46.000000000 +0900
+++ linux/arch/mips/mm/init.c   2006-09-24 14:23:56.000000000 +0900
@@ -155,24 +155,22 @@ void __init paging_init(void)
        low = max_low_pfn;
        high = highend_pfn;

-#ifdef CONFIG_ISA
-       if (low < max_dma)
+       if (low < max_dma) {
                zones_size[ZONE_DMA] = low;
-       else {
+       } else {
                zones_size[ZONE_DMA] = max_dma;
                zones_size[ZONE_NORMAL] = low - max_dma;
        }
-#else
-       zones_size[ZONE_DMA] = low;
-#endif
+
#ifdef CONFIG_HIGHMEM
        if (cpu_has_dc_aliases) {
                printk(KERN_WARNING "This processor doesn't support highmem.");
                if (high - low)
                        printk(" %ldk highmem ignored", high - low);
                printk("\n");
-       } else
-               zones_size[ZONE_HIGHMEM] = high - low;
+       } else {
+               zones_size[ZONE_HIGHMEM] = high - highstart_pfn;
+       }
#endif

        free_area_init(zones_size);
@@ -233,7 +231,7 @@ void __init mem_init(void)

#ifdef CONFIG_HIGHMEM
        for (tmp = highstart_pfn; tmp < highend_pfn; tmp++) {
-               struct page *page = mem_map + tmp;
+               struct page *page = pfn_to_page(tmp);

                if (!page_is_ram(tmp)) {
                        SetPageReserved(page);
diff -uprN -X linux-vanilla/Documentation/dontdiff
linux-vanilla/include/asm-mips/dma.h linux/include/asm-mips/dma.h
--- linux-vanilla/include/asm-mips/dma.h        2006-09-24 12:23:34.000000000 
+0900
+++ linux/include/asm-mips/dma.h        2006-09-24 14:14:28.000000000 +0900
@@ -87,8 +87,13 @@
/* Horrible hack to have a correct DMA window on IP22 */
#include <asm/sgi/mc.h>
#define MAX_DMA_ADDRESS         (PAGE_OFFSET + SGIMC_SEG0_BADDR + 0x01000000)
-#else
+#elif defined(CONFIG_ISA)
#define MAX_DMA_ADDRESS         (PAGE_OFFSET + 0x01000000)
+#else
+#ifndef PLAT_MAX_DMA_SIZE
+#define PLAT_MAX_DMA_SIZE       0x10000000    /* 256MB: true for most
of the MIPS32 systems */
+#endif
+#define MAX_DMA_ADDRESS                (PAGE_OFFSET + PLAT_MAX_DMA_SIZE)
#endif

/* 8237 DMA controllers */
diff -uprN -X linux-vanilla/Documentation/dontdiff
linux-vanilla/include/asm-mips/io.h linux/include/asm-mips/io.h
--- linux-vanilla/include/asm-mips/io.h 2006-09-24 12:23:34.000000000 +0900
+++ linux/include/asm-mips/io.h 2006-09-24 12:40:12.000000000 +0900
@@ -116,7 +116,7 @@ static inline void set_io_port_base(unsi
 */
static inline unsigned long virt_to_phys(volatile void * address)
{
-       return (unsigned long)address - PAGE_OFFSET;
+  return (unsigned long) __pa(address);
}

/*
@@ -133,7 +133,7 @@ static inline unsigned long virt_to_phys
 */
static inline void * phys_to_virt(unsigned long address)
{
-       return (void *)(address + PAGE_OFFSET);
+  return (void *) __va(address);
}

/*
@@ -141,12 +141,12 @@ static inline void * phys_to_virt(unsign
 */
static inline unsigned long isa_virt_to_bus(volatile void * address)
{
-       return (unsigned long)address - PAGE_OFFSET;
+  return (unsigned long) __pa(address);
}

static inline void * isa_bus_to_virt(unsigned long address)
{
-       return (void *)(address + PAGE_OFFSET);
+  return (void *) __va(address);
}

#define isa_page_to_bus page_to_phys
diff -uprN -X linux-vanilla/Documentation/dontdiff
linux-vanilla/include/asm-mips/page.h linux/include/asm-mips/page.h
--- linux-vanilla/include/asm-mips/page.h       2006-09-24 12:23:34.000000000 
+0900
+++ linux/include/asm-mips/page.h       2006-09-24 14:00:53.000000000 +0900
@@ -134,8 +134,13 @@ typedef struct { unsigned long pgprot; }
/* to align the pointer to the (next) page boundary */
#define PAGE_ALIGN(addr)        (((addr) + PAGE_SIZE - 1) & PAGE_MASK)

-#define __pa(x)                        ((unsigned long) (x) - PAGE_OFFSET)
-#define __va(x)                        ((void *)((unsigned long) (x) + 
PAGE_OFFSET))
+#define UNMAPLIMIT              (UNCAC_BASE - CAC_BASE) /*HIGHMEM_START*/
+#define ISMAPPED(x)             (KSEGX((x)) > UNMAPLIMIT)
+#define ___pa(x)               ((unsigned long) (x) - PAGE_OFFSET)
+#define __pa(x)                        (ISMAPPED(x) ? (x) : ___pa(x))
+
+#define ___va(x)               ((void *)((unsigned long) (x) + PAGE_OFFSET))
+#define __va(x)                        (ISMAPPED(x) ? (x) : ___va(x))

#define pfn_to_kaddr(pfn)       __va((pfn) << PAGE_SHIFT)