Messages in this thread | | | Date | Wed, 13 Oct 2010 10:57:48 +0200 | From | Uwe Kleine-König <> | Subject | Re: [PATCHv7] ARM: imx: Add iram allocator functions |
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Hello Dinh,
On Tue, Oct 12, 2010 at 11:29:01AM -0500, Dinh.Nguyen@freescale.com wrote: > From: Dinh Nguyen <Dinh.Nguyen@freescale.com> > > 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>
Thanks Uwe
> --- > arch/arm/plat-mxc/Kconfig | 4 ++ > arch/arm/plat-mxc/Makefile | 1 + > arch/arm/plat-mxc/include/mach/iram.h | 41 ++++++++++++++++++ > arch/arm/plat-mxc/iram_alloc.c | 73 +++++++++++++++++++++++++++++++++ > 4 files changed, 119 insertions(+), 0 deletions(-) > create mode 100644 arch/arm/plat-mxc/include/mach/iram.h > create mode 100644 arch/arm/plat-mxc/iram_alloc.c > > diff --git a/arch/arm/plat-mxc/Kconfig b/arch/arm/plat-mxc/Kconfig > index 6785db4..0e99bb4 100644 > --- a/arch/arm/plat-mxc/Kconfig > +++ b/arch/arm/plat-mxc/Kconfig > @@ -110,4 +110,8 @@ config ARCH_MXC_AUDMUX_V1 > config ARCH_MXC_AUDMUX_V2 > bool > > +config IRAM_ALLOC > + bool > + select GENERIC_ALLOCATOR > + > endif > diff --git a/arch/arm/plat-mxc/Makefile b/arch/arm/plat-mxc/Makefile > index 78d405e..1ddfb13 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_alloc.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.h b/arch/arm/plat-mxc/include/mach/iram.h > new file mode 100644 > index 0000000..022690c > --- /dev/null > +++ b/arch/arm/plat-mxc/include/mach/iram.h > @@ -0,0 +1,41 @@ > +/* > + * 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 > diff --git a/arch/arm/plat-mxc/iram_alloc.c b/arch/arm/plat-mxc/iram_alloc.c > new file mode 100644 > index 0000000..074c386 > --- /dev/null > +++ b/arch/arm/plat-mxc/iram_alloc.c > @@ -0,0 +1,73 @@ > +/* > + * 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; > +} > -- > 1.6.0.4 > > > > _______________________________________________ > linux-arm-kernel mailing list > linux-arm-kernel@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel >
-- Pengutronix e.K. | Uwe Kleine-König | Industrial Linux Solutions | http://www.pengutronix.de/ | -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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