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68a2f7301a
Add IRAM(Internal RAM) allocation functions using GENERIC_ALLOCATOR. The allocation size is 4KB multiples to guarantee alignment. The idea for these functions is for i.MX platforms to use them to dynamically allocate IRAM usage. Applies on 2.6.36-rc7 Signed-off-by: Dinh Nguyen <Dinh.Nguyen@freescale.com> Reviewed-by: Amit Kucheria <amit.kucheria@canonical.com> Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
73 lines
2 KiB
C
73 lines
2 KiB
C
/*
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* Copyright (C) 2010 Freescale Semiconductor, Inc. All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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*/
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#include <linux/kernel.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/spinlock.h>
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#include <linux/genalloc.h>
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#include <mach/iram.h>
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static unsigned long iram_phys_base;
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static void __iomem *iram_virt_base;
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static struct gen_pool *iram_pool;
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static inline void __iomem *iram_phys_to_virt(unsigned long p)
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{
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return iram_virt_base + (p - iram_phys_base);
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}
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void __iomem *iram_alloc(unsigned int size, unsigned long *dma_addr)
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{
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if (!iram_pool)
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return NULL;
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*dma_addr = gen_pool_alloc(iram_pool, size);
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pr_debug("iram alloc - %dB@0x%lX\n", size, *dma_addr);
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if (!*dma_addr)
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return NULL;
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return iram_phys_to_virt(*dma_addr);
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}
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EXPORT_SYMBOL(iram_alloc);
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void iram_free(unsigned long addr, unsigned int size)
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{
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if (!iram_pool)
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return;
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gen_pool_free(iram_pool, addr, size);
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}
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EXPORT_SYMBOL(iram_free);
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int __init iram_init(unsigned long base, unsigned long size)
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{
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iram_phys_base = base;
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iram_pool = gen_pool_create(PAGE_SHIFT, -1);
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if (!iram_pool)
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return -ENOMEM;
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gen_pool_add(iram_pool, base, size, -1);
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iram_virt_base = ioremap(iram_phys_base, size);
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if (!iram_virt_base)
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return -EIO;
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pr_debug("i.MX IRAM pool: %ld KB@0x%p\n", size / 1024, iram_virt_base);
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return 0;
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}
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