forked from luck/tmp_suning_uos_patched
ARM: imx: Add iram allocator functions
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>
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@ -122,4 +122,8 @@ config ARCH_MXC_AUDMUX_V1
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config ARCH_MXC_AUDMUX_V2
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bool
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config IRAM_ALLOC
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bool
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select GENERIC_ALLOCATOR
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endif
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@ -10,6 +10,7 @@ obj-$(CONFIG_MXC_TZIC) += tzic.o
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obj-$(CONFIG_IMX_HAVE_IOMUX_V1) += iomux-v1.o
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obj-$(CONFIG_ARCH_MXC_IOMUX_V3) += iomux-v3.o
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obj-$(CONFIG_IRAM_ALLOC) += iram_alloc.o
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obj-$(CONFIG_MXC_PWM) += pwm.o
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obj-$(CONFIG_USB_EHCI_MXC) += ehci.o
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obj-$(CONFIG_MXC_ULPI) += ulpi.o
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41
arch/arm/plat-mxc/include/mach/iram.h
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41
arch/arm/plat-mxc/include/mach/iram.h
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@ -0,0 +1,41 @@
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/*
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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/errno.h>
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#ifdef CONFIG_IRAM_ALLOC
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int __init iram_init(unsigned long base, unsigned long size);
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void __iomem *iram_alloc(unsigned int size, unsigned long *dma_addr);
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void iram_free(unsigned long dma_addr, unsigned int size);
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#else
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static inline int __init iram_init(unsigned long base, unsigned long size)
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{
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return -ENOMEM;
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}
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static inline void __iomem *iram_alloc(unsigned int size, unsigned long *dma_addr)
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{
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return NULL;
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}
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static inline void iram_free(unsigned long base, unsigned long size) {}
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#endif
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73
arch/arm/plat-mxc/iram_alloc.c
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73
arch/arm/plat-mxc/iram_alloc.c
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@ -0,0 +1,73 @@
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/*
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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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