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Commit 68a2f730 authored by Dinh Nguyen's avatar Dinh Nguyen Committed by Sascha Hauer
Browse files

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: default avatarDinh Nguyen <Dinh.Nguyen@freescale.com>
Reviewed-by: default avatarAmit Kucheria <amit.kucheria@canonical.com>
Acked-by: default avatarUwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: default avatarSascha Hauer <s.hauer@pengutronix.de>
parent 81490fcd

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;

}