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/types.h>
11 #include <linux/kernel.h>
12 #include <linux/init.h>
13 #include <linux/ioport.h>
14 #include <linux/slab.h>
15 #include <linux/string.h>
16 #include <linux/module.h>
19 #include <asm/amigahw.h>
21 unsigned long amiga_chip_size;
22 EXPORT_SYMBOL(amiga_chip_size);
24 static struct resource chipram_res = {
25 .name = "Chip RAM", .start = CHIP_PHYSADDR
27 static unsigned long chipavail;
30 void __init amiga_chip_init(void)
32 if (!AMIGAHW_PRESENT(CHIP_RAM))
35 #ifndef CONFIG_APUS_FAST_EXCEPT
37 * Remove the first 4 pages where PPC exception handlers will be located
39 amiga_chip_size -= 0x4000;
41 chipram_res.end = amiga_chip_size-1;
42 request_resource(&iomem_resource, &chipram_res);
44 chipavail = amiga_chip_size;
48 void *amiga_chip_alloc(unsigned long size, const char *name)
53 size = PAGE_ALIGN(size);
56 printk("amiga_chip_alloc: allocate %ld bytes\n", size);
58 res = kzalloc(sizeof(struct resource), GFP_KERNEL);
63 if (allocate_resource(&chipram_res, res, size, 0, UINT_MAX, PAGE_SIZE, NULL, NULL) < 0) {
69 printk("amiga_chip_alloc: returning %lx\n", res->start);
71 return (void *)ZTWO_VADDR(res->start);
73 EXPORT_SYMBOL(amiga_chip_alloc);
78 * amiga_chip_alloc_res is meant only for drivers that need to allocate
79 * Chip RAM before kmalloc() is functional. As a consequence, those
80 * drivers must not free that Chip RAM afterwards.
83 void * __init amiga_chip_alloc_res(unsigned long size, struct resource *res)
88 size = PAGE_ALIGN(size);
89 /* dmesg into chipmem prefers memory at the safe end */
90 start = CHIP_PHYSADDR + chipavail - size;
93 printk("amiga_chip_alloc_res: allocate %ld bytes\n", size);
95 if (allocate_resource(&chipram_res, res, size, start, UINT_MAX, PAGE_SIZE, NULL, NULL) < 0) {
96 printk("amiga_chip_alloc_res: first alloc failed!\n");
97 if (allocate_resource(&chipram_res, res, size, 0, UINT_MAX, PAGE_SIZE, NULL, NULL) < 0)
102 printk("amiga_chip_alloc_res: returning %lx\n", res->start);
104 return (void *)ZTWO_VADDR(res->start);
107 void amiga_chip_free(void *ptr)
109 unsigned long start = ZTWO_PADDR(ptr);
110 struct resource **p, *res;
113 for (p = &chipram_res.child; (res = *p); p = &res->sibling) {
114 if (res->start != start)
117 size = res->end-start;
119 printk("amiga_chip_free: free %ld bytes at %p\n", size, ptr);
125 printk("amiga_chip_free: trying to free nonexistent region at %p\n", ptr);
127 EXPORT_SYMBOL(amiga_chip_free);
130 unsigned long amiga_chip_avail(void)
133 printk("amiga_chip_avail : %ld bytes\n", chipavail);
137 EXPORT_SYMBOL(amiga_chip_avail);