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Diffstat (limited to 'arch/m68k/amiga/chipram.c')
-rw-r--r--arch/m68k/amiga/chipram.c136
1 files changed, 63 insertions, 73 deletions
diff --git a/arch/m68k/amiga/chipram.c b/arch/m68k/amiga/chipram.c
index dd0447d..99449fb 100644
--- 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 = CHIP_PHYSADDR + 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;
+ struct resource *res;
+ void *p;
- /* round up */
- size = PAGE_ALIGN(size);
+ res = kzalloc(sizeof(struct resource), GFP_KERNEL);
+ if (!res)
+ return NULL;
-#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;
+ res->name = name;
+ p = amiga_chip_alloc_res(size, res);
+ if (!p) {
+ kfree(res);
+ return NULL;
+ }
- 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);
+ 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;
+ unsigned long start = ZTWO_PADDR(ptr);
+ struct resource *res;
+ unsigned long size;
+
+ res = lookup_resource(&chipram_res, start);
+ if (!res) {
+ pr_err("amiga_chip_free: trying to free nonexistent region at "
+ "%p\n", ptr);
+ return;
+ }
+
+ size = resource_size(res);
+ pr_debug("amiga_chip_free: free %lu bytes at %p\n", size, ptr);
+ atomic_add(size, &chipavail);
+ release_resource(res);
kfree(res);
- return;
- }
- printk("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);