2 ** linux/amiga/chipram.c
4 ** Modified 03-May-94 by Geert Uytterhoeven <geert@linux-m68k.org>
5 ** - 64-bit aligned allocations for full AGA compatibility
7 ** Rewritten 15/9/2000 by Geert to use resource management
10 #include <linux/config.h>
11 #include <linux/types.h>
12 #include <linux/kernel.h>
13 #include <linux/init.h>
14 #include <linux/ioport.h>
15 #include <linux/slab.h>
16 #include <asm/amigahw.h>
18 unsigned long amiga_chip_size;
20 static struct resource chipram_res = { "Chip RAM", CHIP_PHYSADDR };
21 static unsigned long chipavail;
24 void __init amiga_chip_init(void)
26 if (!AMIGAHW_PRESENT(CHIP_RAM))
29 #ifndef CONFIG_APUS_FAST_EXCEPT
31 * Remove the first 4 pages where PPC exception handlers will be located
33 amiga_chip_size -= 0x4000;
35 chipram_res.end = amiga_chip_size-1;
36 request_resource(&iomem_resource, &chipram_res);
38 chipavail = amiga_chip_size;
42 void *amiga_chip_alloc(unsigned long size, const char *name)
47 size = PAGE_ALIGN(size);
50 printk("amiga_chip_alloc: allocate %ld bytes\n", size);
52 res = kmalloc(sizeof(struct resource), GFP_KERNEL);
55 memset(res, 0, sizeof(struct resource));
58 if (allocate_resource(&chipram_res, res, size, 0, UINT_MAX, PAGE_SIZE, NULL, NULL) < 0) {
64 printk("amiga_chip_alloc: returning %lx\n", res->start);
66 return (void *)ZTWO_VADDR(res->start);
72 * amiga_chip_alloc_res is meant only for drivers that need to allocate
73 * Chip RAM before kmalloc() is functional. As a consequence, those
74 * drivers must not free that Chip RAM afterwards.
77 void * __init amiga_chip_alloc_res(unsigned long size, struct resource *res)
82 size = PAGE_ALIGN(size);
83 /* dmesg into chipmem prefers memory at the safe end */
84 start = CHIP_PHYSADDR + chipavail - size;
87 printk("amiga_chip_alloc_res: allocate %ld bytes\n", size);
89 if (allocate_resource(&chipram_res, res, size, start, UINT_MAX, PAGE_SIZE, NULL, NULL) < 0) {
90 printk("amiga_chip_alloc_res: first alloc failed!\n");
91 if (allocate_resource(&chipram_res, res, size, 0, UINT_MAX, PAGE_SIZE, NULL, NULL) < 0)
96 printk("amiga_chip_alloc_res: returning %lx\n", res->start);
98 return (void *)ZTWO_VADDR(res->start);
101 void amiga_chip_free(void *ptr)
103 unsigned long start = ZTWO_PADDR(ptr);
104 struct resource **p, *res;
107 for (p = &chipram_res.child; (res = *p); p = &res->sibling) {
108 if (res->start != start)
111 size = res->end-start;
113 printk("amiga_chip_free: free %ld bytes at %p\n", size, ptr);
119 printk("amiga_chip_free: trying to free nonexistent region at %p\n", ptr);
123 unsigned long amiga_chip_avail(void)
126 printk("amiga_chip_avail : %ld bytes\n", chipavail);