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68a2f730 DN |
1 | /* |
2 | * Copyright (C) 2010 Freescale Semiconductor, Inc. All Rights Reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation; either version 2 | |
7 | * of the License, or (at your option) any later version. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, write to the Free Software | |
16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, | |
17 | * MA 02110-1301, USA. | |
18 | */ | |
19 | ||
20 | #include <linux/kernel.h> | |
21 | #include <linux/io.h> | |
22 | #include <linux/module.h> | |
23 | #include <linux/spinlock.h> | |
24 | #include <linux/genalloc.h> | |
25 | #include <mach/iram.h> | |
26 | ||
27 | static unsigned long iram_phys_base; | |
28 | static void __iomem *iram_virt_base; | |
29 | static struct gen_pool *iram_pool; | |
30 | ||
31 | static inline void __iomem *iram_phys_to_virt(unsigned long p) | |
32 | { | |
33 | return iram_virt_base + (p - iram_phys_base); | |
34 | } | |
35 | ||
36 | void __iomem *iram_alloc(unsigned int size, unsigned long *dma_addr) | |
37 | { | |
38 | if (!iram_pool) | |
39 | return NULL; | |
40 | ||
41 | *dma_addr = gen_pool_alloc(iram_pool, size); | |
42 | pr_debug("iram alloc - %dB@0x%lX\n", size, *dma_addr); | |
43 | if (!*dma_addr) | |
44 | return NULL; | |
45 | return iram_phys_to_virt(*dma_addr); | |
46 | } | |
47 | EXPORT_SYMBOL(iram_alloc); | |
48 | ||
49 | void iram_free(unsigned long addr, unsigned int size) | |
50 | { | |
51 | if (!iram_pool) | |
52 | return; | |
53 | ||
54 | gen_pool_free(iram_pool, addr, size); | |
55 | } | |
56 | EXPORT_SYMBOL(iram_free); | |
57 | ||
58 | int __init iram_init(unsigned long base, unsigned long size) | |
59 | { | |
60 | iram_phys_base = base; | |
61 | ||
62 | iram_pool = gen_pool_create(PAGE_SHIFT, -1); | |
63 | if (!iram_pool) | |
64 | return -ENOMEM; | |
65 | ||
66 | gen_pool_add(iram_pool, base, size, -1); | |
67 | iram_virt_base = ioremap(iram_phys_base, size); | |
68 | if (!iram_virt_base) | |
69 | return -EIO; | |
70 | ||
71 | pr_debug("i.MX IRAM pool: %ld KB@0x%p\n", size / 1024, iram_virt_base); | |
72 | return 0; | |
73 | } |