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-rw-r--r--arch/m68k/amiga/chipram.c133
1 files changed, 133 insertions, 0 deletions
diff --git a/arch/m68k/amiga/chipram.c b/arch/m68k/amiga/chipram.c
new file mode 100644
index 000000000000..558d5fd2d2ba
--- /dev/null
+++ b/arch/m68k/amiga/chipram.c
@@ -0,0 +1,133 @@
+/*
+** linux/amiga/chipram.c
+**
+** Modified 03-May-94 by Geert Uytterhoeven <geert@linux-m68k.org>
+** - 64-bit aligned allocations for full AGA compatibility
+**
+** Rewritten 15/9/2000 by Geert to use resource management
+*/
+
+#include <linux/config.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <asm/page.h>
+#include <asm/amigahw.h>
+
+unsigned long amiga_chip_size;
+
+static struct resource chipram_res = {
+ .name = "Chip RAM", .start = CHIP_PHYSADDR
+};
+static unsigned long chipavail;
+
+
+void __init amiga_chip_init(void)
+{
+ if (!AMIGAHW_PRESENT(CHIP_RAM))
+ return;
+
+#ifndef CONFIG_APUS_FAST_EXCEPT
+ /*
+ * Remove the first 4 pages where PPC exception handlers will be located
+ */
+ amiga_chip_size -= 0x4000;
+#endif
+ chipram_res.end = amiga_chip_size-1;
+ request_resource(&iomem_resource, &chipram_res);
+
+ 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 = kmalloc(sizeof(struct resource), GFP_KERNEL);
+ if (!res)
+ return NULL;
+ memset(res, 0, sizeof(struct resource));
+ 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);
+}
+
+
+ /*
+ * 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)
+{
+ 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);
+}
+
+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 amiga_chip_avail(void)
+{
+#ifdef DEBUG
+ printk("amiga_chip_avail : %ld bytes\n", chipavail);
+#endif
+ return chipavail;
+}