diff options
author | Rob Herring <r.herring@freescale.com> | 2010-01-22 14:55:59 -0200 |
---|---|---|
committer | Rob Herring <r.herring@freescale.com> | 2010-02-04 10:50:49 -0600 |
commit | 34de1b36e15c5e38f70bdcad050667052598d769 (patch) | |
tree | 45f4ba0547cfc1ad42e77f4c314b8133e0781447 | |
parent | 964a5efab3fc3b1e74e6ad3b40df5d75fb13e41c (diff) |
ENGR00120393-1 imx: Add iram allocator functions
Add iram allocation functions using GENERIC_ALLOCATOR. The
allocation size is 4KB multiples to guarantee alignment.
Signed-off-by: Rob Herring <r.herring@freescale.com>
-rw-r--r-- | arch/arm/plat-mxc/Kconfig | 5 | ||||
-rw-r--r-- | arch/arm/plat-mxc/Makefile | 2 | ||||
-rw-r--r-- | arch/arm/plat-mxc/iram.c | 62 | ||||
-rw-r--r-- | include/linux/iram_alloc.h | 35 |
4 files changed, 104 insertions, 0 deletions
diff --git a/arch/arm/plat-mxc/Kconfig b/arch/arm/plat-mxc/Kconfig index 45bd4b79187b..58dd1434b39c 100644 --- a/arch/arm/plat-mxc/Kconfig +++ b/arch/arm/plat-mxc/Kconfig @@ -60,6 +60,11 @@ source "arch/arm/mach-mx51/Kconfig" endmenu +config IRAM_ALLOC + bool + default y + select GENERIC_ALLOCATOR + config MXC_TZIC bool depends on ARCH_MXC diff --git a/arch/arm/plat-mxc/Makefile b/arch/arm/plat-mxc/Makefile index 7a1b935ff19f..203c29928df4 100644 --- a/arch/arm/plat-mxc/Makefile +++ b/arch/arm/plat-mxc/Makefile @@ -5,6 +5,8 @@ # Common support obj-y := cpu.o cpu_common.o gpio.o clock.o wdog.o snoop.o io.o time.o +obj-$(CONFIG_IRAM_ALLOC) += iram.o + obj-$(CONFIG_ARCH_MX1) += iomux-mx1-mx2.o dma-mx1-mx2.o obj-$(CONFIG_ARCH_MX2) += iomux-mx1-mx2.o dma-mx1-mx2.o obj-$(CONFIG_ARCH_MXC_IOMUX_V3) += iomux-v3.o diff --git a/arch/arm/plat-mxc/iram.c b/arch/arm/plat-mxc/iram.c new file mode 100644 index 000000000000..3d2a391bd2d1 --- /dev/null +++ b/arch/arm/plat-mxc/iram.c @@ -0,0 +1,62 @@ +/* + * 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> + +static unsigned long iram_phys_base; +static __iomem void *iram_virt_base; +static struct gen_pool *iram_pool; + +#define iram_phys_to_virt(p) (iram_virt_base + ((p) - iram_phys_base)) + +void *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%p\n", size, (void *)*dma_addr); + 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(12, -1); + gen_pool_add(iram_pool, base, size, -1); + iram_virt_base = ioremap(iram_phys_base, size); + + pr_info("i.MX IRAM pool: %ld KB@0x%p\n", size / 1024, iram_virt_base); + return 0; +} diff --git a/include/linux/iram_alloc.h b/include/linux/iram_alloc.h new file mode 100644 index 000000000000..12881aaa3d21 --- /dev/null +++ b/include/linux/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; +} +static inline void iram_free(unsigned long base, unsigned long size) {} +#endif + |