linux-kernel - Re: [PATCH] ARM: imx: Add iram allocator functions

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Message-ID: <20101004121410.GC2529@matterhorn.lan>
Date:	Mon, 4 Oct 2010 15:14:10 +0300
From:	Amit Kucheria <amit.kucheria@...onical.com>
To:	Lothar Waßmann <LW@...O-electronics.de>
Cc:	Dinh.Nguyen@...escale.com, s.hauer@...gutronix.de,
	linux-kernel@...r.kernel.org, grant.likely@...retlab.ca,
	valentin.longchamp@...l.ch, daniel@...aq.de,
	xiao-lizhang@...escale.com, r.schwebel@...gutronix.de,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] ARM: imx: Add iram allocator functions

On 10 Oct 04, Lothar Waßmann wrote:
> Amit Kucheria writes:
> > On 10 Oct 01, Dinh.Nguyen@...escale.com wrote:
> > > From: Dinh Nguyen <Dinh.Nguyen@...escale.com>
> > > 
> > > Add iram 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-rc6
> > > 
> > > Signed-off-by: Dinh Nguyen <Dinh.Nguyen@...escale.com>
> > > ---
> > >  arch/arm/plat-mxc/Kconfig                   |    5 ++
> > >  arch/arm/plat-mxc/Makefile                  |    1 +
> > >  arch/arm/plat-mxc/include/mach/iram_alloc.h |   35 +++++++++++++++
> > >  arch/arm/plat-mxc/iram.c                    |   62 +++++++++++++++++++++++++++
> > >  4 files changed, 103 insertions(+), 0 deletions(-)
> > >  create mode 100644 arch/arm/plat-mxc/include/mach/iram_alloc.h
> > >  create mode 100644 arch/arm/plat-mxc/iram.c
> > > 
> > > diff --git a/arch/arm/plat-mxc/Kconfig b/arch/arm/plat-mxc/Kconfig
> > > index 6785db4..283d5bc 100644
> > > --- a/arch/arm/plat-mxc/Kconfig
> > > +++ b/arch/arm/plat-mxc/Kconfig
> > > @@ -57,6 +57,11 @@ source "arch/arm/mach-mx5/Kconfig"
> > >  
> > >  endmenu
> > >  
> > > +config IRAM_ALLOC
> > > +	bool
> > 
> > If it is a bool, shouldn't it need a description entry so it shows up in the
> > menuconfig?
> > 
> > It can't be disabled currently.
> > 
> > > +	default y
> > > +	select GENERIC_ALLOCATOR
> > > +
> > >  config MXC_IRQ_PRIOR
> > >  	bool "Use IRQ priority"
> > >  	help
> > > diff --git a/arch/arm/plat-mxc/Makefile b/arch/arm/plat-mxc/Makefile
> > > index 78d405e..35cf07b 100644
> > > --- a/arch/arm/plat-mxc/Makefile
> > > +++ b/arch/arm/plat-mxc/Makefile
> > > @@ -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.o
> > >  obj-$(CONFIG_MXC_PWM)  += pwm.o
> > >  obj-$(CONFIG_USB_EHCI_MXC) += ehci.o
> > >  obj-$(CONFIG_MXC_ULPI) += ulpi.o
> > > diff --git a/arch/arm/plat-mxc/include/mach/iram_alloc.h b/arch/arm/plat-mxc/include/mach/iram_alloc.h
> > > new file mode 100644
> > > index 0000000..12881aa
> > > --- /dev/null
> > > +++ b/arch/arm/plat-mxc/include/mach/iram_alloc.h
> > > @@ -0,0 +1,35 @@
> > > +/*
> > > + * 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.
> > > + */
> > > +
> > > +#ifdef CONFIG_IRAM_ALLOC
> > > +int __init iram_init(unsigned long base, unsigned long size);
> > > +void *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 *iram_alloc(unsigned int size, unsigned long *dma_addr)
>                         ^
> > > +{
> > > +	return NULL;
> > 
> > Return for a void function
> > 
> Not quite. You obviously missed the one and only star in the void. ;)

Heh :) Indeed.

Dinh, you can add a reviewed-by after addressing the Kconfig entry.

/Amit
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