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>
13 #include <linux/init.h>
14 #include <linux/ioport.h>
15 #include <linux/slab.h>
16 #include <linux/string.h>
17 #include <linux/module.h>
20 #include <asm/amigahw.h>
22 unsigned long amiga_chip_size;
23 EXPORT_SYMBOL(amiga_chip_size);
25 static struct resource chipram_res = {
26 .name = "Chip RAM", .start = CHIP_PHYSADDR
28 static unsigned long chipavail;
31 void __init amiga_chip_init(void)
33 if (!AMIGAHW_PRESENT(CHIP_RAM))
36 chipram_res.end = amiga_chip_size-1;
37 request_resource(&iomem_resource, &chipram_res);
39 chipavail = amiga_chip_size;
43 void *amiga_chip_alloc(unsigned long size, const char *name)
48 size = PAGE_ALIGN(size);
50 pr_debug("amiga_chip_alloc: allocate %lu bytes\n", size);
51 res = kzalloc(sizeof(struct resource), GFP_KERNEL);
56 if (allocate_resource(&chipram_res, res, size, 0, UINT_MAX, PAGE_SIZE,
62 pr_debug("amiga_chip_alloc: returning %pR\n", res);
63 return (void *)ZTWO_VADDR(res->start);
65 EXPORT_SYMBOL(amiga_chip_alloc);
70 * amiga_chip_alloc_res is meant only for drivers that need to
71 * allocate Chip RAM before kmalloc() is functional. As a consequence,
72 * those drivers must not free that Chip RAM afterwards.
75 void * __init amiga_chip_alloc_res(unsigned long size, struct resource *res)
80 size = PAGE_ALIGN(size);
81 /* dmesg into chipmem prefers memory at the safe end */
82 start = CHIP_PHYSADDR + chipavail - size;
84 pr_debug("amiga_chip_alloc_res: allocate %lu bytes\n", size);
85 if (allocate_resource(&chipram_res, res, size, start, UINT_MAX,
86 PAGE_SIZE, NULL, NULL) < 0) {
87 pr_err("amiga_chip_alloc_res: first alloc failed!\n");
88 if (allocate_resource(&chipram_res, res, size, 0, UINT_MAX,
89 PAGE_SIZE, NULL, NULL) < 0)
93 pr_debug("amiga_chip_alloc_res: returning %pR\n", res);
94 return (void *)ZTWO_VADDR(res->start);
97 void amiga_chip_free(void *ptr)
99 unsigned long start = ZTWO_PADDR(ptr);
100 struct resource **p, *res;
103 for (p = &chipram_res.child; (res = *p); p = &res->sibling) {
104 if (res->start != start)
107 size = res->end-start;
108 pr_debug("amiga_chip_free: free %lu bytes at %p\n", size, ptr);
113 pr_err("amiga_chip_free: trying to free nonexistent region at %p\n",
116 EXPORT_SYMBOL(amiga_chip_free);
119 unsigned long amiga_chip_avail(void)
121 pr_debug("amiga_chip_avail : %lu bytes\n", chipavail);
124 EXPORT_SYMBOL(amiga_chip_avail);