| Dinh Nguyen | 68a2f73 | 2010-10-12 11:29:01 -0500 | [diff] [blame] | 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 | } |