m68k/amiga: Chip RAM - Change chipavail to an atomic_t

[pandora-kernel.git] / arch / m68k / amiga / chipram.c

diff --git a/arch/m68k/amiga/chipram.c b/arch/m68k/amiga/chipram.c
index dd0447d..c3fe451 100644 (file)
--- a/arch/m68k/amiga/chipram.c
+++ b/arch/m68k/amiga/chipram.c
@@ -16,6 +16,7 @@
 #include <linux/string.h>
 #include <linux/module.h>
 
+#include <asm/atomic.h>
 #include <asm/page.h>
 #include <asm/amigahw.h>
 
@@ -23,111 +24,100 @@ unsigned long amiga_chip_size;
 EXPORT_SYMBOL(amiga_chip_size);
 
 static struct resource chipram_res = {
-    .name = "Chip RAM", .start = CHIP_PHYSADDR
+       .name = "Chip RAM", .start = CHIP_PHYSADDR
 };
-static unsigned long chipavail;
+static atomic_t chipavail;
 
 
 void __init amiga_chip_init(void)
 {
-    if (!AMIGAHW_PRESENT(CHIP_RAM))
-       return;
+       if (!AMIGAHW_PRESENT(CHIP_RAM))
+               return;
 
-    chipram_res.end = amiga_chip_size-1;
-    request_resource(&iomem_resource, &chipram_res);
+       chipram_res.end = amiga_chip_size-1;
+       request_resource(&iomem_resource, &chipram_res);
 
-    chipavail = amiga_chip_size;
+       atomic_set(&chipavail, amiga_chip_size);
 }
 
 
 void *amiga_chip_alloc(unsigned long size, const char *name)
 {
-    struct resource *res;
-
-    /* round up */
-    size = PAGE_ALIGN(size);
-
-#ifdef DEBUG
-    printk("amiga_chip_alloc: allocate %ld bytes\n", size);
-#endif
-    res = kzalloc(sizeof(struct resource), GFP_KERNEL);
-    if (!res)
-       return NULL;
-    res->name = name;
-
-    if (allocate_resource(&chipram_res, res, size, 0, UINT_MAX, PAGE_SIZE, NULL, NULL) < 0) {
-       kfree(res);
-       return NULL;
-    }
-    chipavail -= size;
-#ifdef DEBUG
-    printk("amiga_chip_alloc: returning %lx\n", res->start);
-#endif
-    return (void *)ZTWO_VADDR(res->start);
+       struct resource *res;
+       void *p;
+
+       res = kzalloc(sizeof(struct resource), GFP_KERNEL);
+       if (!res)
+               return NULL;
+
+       res->name = name;
+       p = amiga_chip_alloc_res(size, res);
+       if (!p) {
+               kfree(res);
+               return NULL;
+       }
+
+       return p;
 }
 EXPORT_SYMBOL(amiga_chip_alloc);
 
 
-    /*
-     *  Warning:
-     *  amiga_chip_alloc_res is meant only for drivers that need to allocate
-     *  Chip RAM before kmalloc() is functional. As a consequence, those
-     *  drivers must not free that Chip RAM afterwards.
-     */
+       /*
+        *  Warning:
+        *  amiga_chip_alloc_res is meant only for drivers that need to
+        *  allocate Chip RAM before kmalloc() is functional. As a consequence,
+        *  those drivers must not free that Chip RAM afterwards.
+        */
 
-void * __init amiga_chip_alloc_res(unsigned long size, struct resource *res)
+void *amiga_chip_alloc_res(unsigned long size, struct resource *res)
 {
-    unsigned long start;
-
-    /* round up */
-    size = PAGE_ALIGN(size);
-    /* dmesg into chipmem prefers memory at the safe end */
-    start = CHIP_PHYSADDR + chipavail - size;
-
-#ifdef DEBUG
-    printk("amiga_chip_alloc_res: allocate %ld bytes\n", size);
-#endif
-    if (allocate_resource(&chipram_res, res, size, start, UINT_MAX, PAGE_SIZE, NULL, NULL) < 0) {
-       printk("amiga_chip_alloc_res: first alloc failed!\n");
-       if (allocate_resource(&chipram_res, res, size, 0, UINT_MAX, PAGE_SIZE, NULL, NULL) < 0)
-           return NULL;
-    }
-    chipavail -= size;
-#ifdef DEBUG
-    printk("amiga_chip_alloc_res: returning %lx\n", res->start);
-#endif
-    return (void *)ZTWO_VADDR(res->start);
+       int error;
+
+       /* round up */
+       size = PAGE_ALIGN(size);
+
+       pr_debug("amiga_chip_alloc_res: allocate %lu bytes\n", size);
+       error = allocate_resource(&chipram_res, res, size, 0, UINT_MAX,
+                                 PAGE_SIZE, NULL, NULL);
+       if (error < 0) {
+               pr_err("amiga_chip_alloc_res: allocate_resource() failed %d!\n",
+                      error);
+               return NULL;
+       }
+
+       atomic_sub(size, &chipavail);
+       pr_debug("amiga_chip_alloc_res: returning %pR\n", res);
+       return (void *)ZTWO_VADDR(res->start);
 }
 
 void amiga_chip_free(void *ptr)
 {
-    unsigned long start = ZTWO_PADDR(ptr);
-    struct resource **p, *res;
-    unsigned long size;
-
-    for (p = &chipram_res.child; (res = *p); p = &res->sibling) {
-       if (res->start != start)
-           continue;
-       *p = res->sibling;
-       size = res->end-start;
-#ifdef DEBUG
-       printk("amiga_chip_free: free %ld bytes at %p\n", size, ptr);
-#endif
-       chipavail += size;
-       kfree(res);
-       return;
-    }
-    printk("amiga_chip_free: trying to free nonexistent region at %p\n", ptr);
+       unsigned long start = ZTWO_PADDR(ptr);
+       struct resource **p, *res;
+       unsigned long size;
+
+       for (p = &chipram_res.child; (res = *p); p = &res->sibling) {
+               if (res->start != start)
+                       continue;
+               *p = res->sibling;
+               size = res->end-start;
+               pr_debug("amiga_chip_free: free %lu bytes at %p\n", size, ptr);
+               atomic_add(size, &chipavail);
+               kfree(res);
+               return;
+       }
+       pr_err("amiga_chip_free: trying to free nonexistent region at %p\n",
+              ptr);
 }
 EXPORT_SYMBOL(amiga_chip_free);
 
 
 unsigned long amiga_chip_avail(void)
 {
-#ifdef DEBUG
-       printk("amiga_chip_avail : %ld bytes\n", chipavail);
-#endif
-       return chipavail;
+       unsigned long n = atomic_read(&chipavail);
+
+       pr_debug("amiga_chip_avail : %lu bytes\n", n);
+       return n;
 }
 EXPORT_SYMBOL(amiga_chip_avail);