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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | ** linux/amiga/chipram.c | |
3 | ** | |
4 | ** Modified 03-May-94 by Geert Uytterhoeven <geert@linux-m68k.org> | |
5 | ** - 64-bit aligned allocations for full AGA compatibility | |
6 | ** | |
7 | ** Rewritten 15/9/2000 by Geert to use resource management | |
8 | */ | |
9 | ||
1da177e4 LT |
10 | #include <linux/types.h> |
11 | #include <linux/kernel.h> | |
27ac792c | 12 | #include <linux/mm.h> |
1da177e4 LT |
13 | #include <linux/init.h> |
14 | #include <linux/ioport.h> | |
15 | #include <linux/slab.h> | |
16 | #include <linux/string.h> | |
8b169fa2 AB |
17 | #include <linux/module.h> |
18 | ||
cab49bc9 | 19 | #include <asm/atomic.h> |
1da177e4 LT |
20 | #include <asm/page.h> |
21 | #include <asm/amigahw.h> | |
22 | ||
23 | unsigned long amiga_chip_size; | |
8b169fa2 | 24 | EXPORT_SYMBOL(amiga_chip_size); |
1da177e4 LT |
25 | |
26 | static struct resource chipram_res = { | |
5be32463 | 27 | .name = "Chip RAM", .start = CHIP_PHYSADDR |
1da177e4 | 28 | }; |
cab49bc9 | 29 | static atomic_t chipavail; |
1da177e4 LT |
30 | |
31 | ||
32 | void __init amiga_chip_init(void) | |
33 | { | |
5be32463 GU |
34 | if (!AMIGAHW_PRESENT(CHIP_RAM)) |
35 | return; | |
1da177e4 | 36 | |
1dad6c7b | 37 | chipram_res.end = CHIP_PHYSADDR + amiga_chip_size - 1; |
5be32463 | 38 | request_resource(&iomem_resource, &chipram_res); |
1da177e4 | 39 | |
cab49bc9 | 40 | atomic_set(&chipavail, amiga_chip_size); |
1da177e4 LT |
41 | } |
42 | ||
43 | ||
44 | void *amiga_chip_alloc(unsigned long size, const char *name) | |
45 | { | |
5be32463 | 46 | struct resource *res; |
3a17bfa4 | 47 | void *p; |
1da177e4 | 48 | |
5be32463 GU |
49 | res = kzalloc(sizeof(struct resource), GFP_KERNEL); |
50 | if (!res) | |
51 | return NULL; | |
5be32463 | 52 | |
3a17bfa4 GU |
53 | res->name = name; |
54 | p = amiga_chip_alloc_res(size, res); | |
55 | if (!p) { | |
5be32463 GU |
56 | kfree(res); |
57 | return NULL; | |
58 | } | |
3a17bfa4 GU |
59 | |
60 | return p; | |
1da177e4 | 61 | } |
8b169fa2 | 62 | EXPORT_SYMBOL(amiga_chip_alloc); |
1da177e4 LT |
63 | |
64 | ||
5be32463 GU |
65 | /* |
66 | * Warning: | |
67 | * amiga_chip_alloc_res is meant only for drivers that need to | |
68 | * allocate Chip RAM before kmalloc() is functional. As a consequence, | |
69 | * those drivers must not free that Chip RAM afterwards. | |
70 | */ | |
1da177e4 | 71 | |
3a17bfa4 | 72 | void *amiga_chip_alloc_res(unsigned long size, struct resource *res) |
1da177e4 | 73 | { |
3a17bfa4 | 74 | int error; |
1da177e4 | 75 | |
5be32463 GU |
76 | /* round up */ |
77 | size = PAGE_ALIGN(size); | |
1da177e4 | 78 | |
b4f6f453 | 79 | pr_debug("amiga_chip_alloc_res: allocate %lu bytes\n", size); |
3a17bfa4 GU |
80 | error = allocate_resource(&chipram_res, res, size, 0, UINT_MAX, |
81 | PAGE_SIZE, NULL, NULL); | |
82 | if (error < 0) { | |
83 | pr_err("amiga_chip_alloc_res: allocate_resource() failed %d!\n", | |
84 | error); | |
85 | return NULL; | |
5be32463 | 86 | } |
3a17bfa4 | 87 | |
cab49bc9 | 88 | atomic_sub(size, &chipavail); |
b4f6f453 | 89 | pr_debug("amiga_chip_alloc_res: returning %pR\n", res); |
6112ea08 | 90 | return ZTWO_VADDR(res->start); |
1da177e4 LT |
91 | } |
92 | ||
93 | void amiga_chip_free(void *ptr) | |
94 | { | |
5be32463 | 95 | unsigned long start = ZTWO_PADDR(ptr); |
b7785e95 | 96 | struct resource *res; |
5be32463 GU |
97 | unsigned long size; |
98 | ||
b7785e95 GU |
99 | res = lookup_resource(&chipram_res, start); |
100 | if (!res) { | |
101 | pr_err("amiga_chip_free: trying to free nonexistent region at " | |
102 | "%p\n", ptr); | |
5be32463 GU |
103 | return; |
104 | } | |
b7785e95 GU |
105 | |
106 | size = resource_size(res); | |
107 | pr_debug("amiga_chip_free: free %lu bytes at %p\n", size, ptr); | |
108 | atomic_add(size, &chipavail); | |
109 | release_resource(res); | |
110 | kfree(res); | |
1da177e4 | 111 | } |
8b169fa2 | 112 | EXPORT_SYMBOL(amiga_chip_free); |
1da177e4 LT |
113 | |
114 | ||
115 | unsigned long amiga_chip_avail(void) | |
116 | { | |
cab49bc9 GU |
117 | unsigned long n = atomic_read(&chipavail); |
118 | ||
119 | pr_debug("amiga_chip_avail : %lu bytes\n", n); | |
120 | return n; | |
1da177e4 | 121 | } |
8b169fa2 AB |
122 | EXPORT_SYMBOL(amiga_chip_avail); |
123 |