ARM: imx: Add iram allocator functions (68a2f730) · Commits · 戴 / test

arch/arm/plat-mxc/Kconfig

+4 −0

Original line number	Diff line number	Diff line
		@@ -122,4 +122,8 @@ config ARCH_MXC_AUDMUX_V1
		config ARCH_MXC_AUDMUX_V2
		bool

		config IRAM_ALLOC
		bool
		select GENERIC_ALLOCATOR

		endif

arch/arm/plat-mxc/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -10,6 +10,7 @@ obj-$(CONFIG_MXC_TZIC) += tzic.o

		obj-$(CONFIG_IMX_HAVE_IOMUX_V1) += iomux-v1.o
		obj-$(CONFIG_ARCH_MXC_IOMUX_V3) += iomux-v3.o
		obj-$(CONFIG_IRAM_ALLOC) += iram_alloc.o
		obj-$(CONFIG_MXC_PWM) += pwm.o
		obj-$(CONFIG_USB_EHCI_MXC) += ehci.o
		obj-$(CONFIG_MXC_ULPI) += ulpi.o

arch/arm/plat-mxc/include/mach/iram.h

0 → 100644

+41 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright (C) 2010 Freescale Semiconductor, Inc. All Rights Reserved.
		*
		* This program is free software; you can redistribute it and/or
		* modify it under the terms of the GNU General Public License
		* as published by the Free Software Foundation; either version 2
		* of the License, or (at your option) any later version.
		*
		* This program is distributed in the hope that it will be useful,
		* but WITHOUT ANY WARRANTY; without even the implied warranty of
		* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
		* GNU General Public License for more details.
		*
		* You should have received a copy of the GNU General Public License
		* along with this program; if not, write to the Free Software
		* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
		* MA 02110-1301, USA.
		*/
		#include <linux/errno.h>

		#ifdef CONFIG_IRAM_ALLOC

		int __init iram_init(unsigned long base, unsigned long size);
		void __iomem iram_alloc(unsigned int size, unsigned long dma_addr);
		void iram_free(unsigned long dma_addr, unsigned int size);

		#else

		static inline int __init iram_init(unsigned long base, unsigned long size)
		{
		return -ENOMEM;
		}

		static inline void __iomem iram_alloc(unsigned int size, unsigned long dma_addr)
		{
		return NULL;
		}

		static inline void iram_free(unsigned long base, unsigned long size) {}

		#endif

arch/arm/plat-mxc/iram_alloc.c

0 → 100644

+73 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright (C) 2010 Freescale Semiconductor, Inc. All Rights Reserved.
		*
		* This program is free software; you can redistribute it and/or
		* modify it under the terms of the GNU General Public License
		* as published by the Free Software Foundation; either version 2
		* of the License, or (at your option) any later version.
		*
		* This program is distributed in the hope that it will be useful,
		* but WITHOUT ANY WARRANTY; without even the implied warranty of
		* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
		* GNU General Public License for more details.
		*
		* You should have received a copy of the GNU General Public License
		* along with this program; if not, write to the Free Software
		* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
		* MA 02110-1301, USA.
		*/

		#include <linux/kernel.h>
		#include <linux/io.h>
		#include <linux/module.h>
		#include <linux/spinlock.h>
		#include <linux/genalloc.h>
		#include <mach/iram.h>

		static unsigned long iram_phys_base;
		static void __iomem *iram_virt_base;
		static struct gen_pool *iram_pool;

		static inline void __iomem *iram_phys_to_virt(unsigned long p)
		{
		return iram_virt_base + (p - iram_phys_base);
		}

		void __iomem iram_alloc(unsigned int size, unsigned long dma_addr)
		{
		if (!iram_pool)
		return NULL;

		*dma_addr = gen_pool_alloc(iram_pool, size);
		pr_debug("iram alloc - %dB@0x%lX\n", size, *dma_addr);
		if (!*dma_addr)
		return NULL;
		return iram_phys_to_virt(*dma_addr);
		}
		EXPORT_SYMBOL(iram_alloc);

		void iram_free(unsigned long addr, unsigned int size)
		{
		if (!iram_pool)
		return;

		gen_pool_free(iram_pool, addr, size);
		}
		EXPORT_SYMBOL(iram_free);

		int __init iram_init(unsigned long base, unsigned long size)
		{
		iram_phys_base = base;

		iram_pool = gen_pool_create(PAGE_SHIFT, -1);
		if (!iram_pool)
		return -ENOMEM;

		gen_pool_add(iram_pool, base, size, -1);
		iram_virt_base = ioremap(iram_phys_base, size);
		if (!iram_virt_base)
		return -EIO;

		pr_debug("i.MX IRAM pool: %ld KB@0x%p\n", size / 1024, iram_virt_base);
		return 0;
		}

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