diff options
| -rw-r--r-- | arch/sh/include/asm/sram.h | 38 | ||||
| -rw-r--r-- | arch/sh/mm/Kconfig | 4 | ||||
| -rw-r--r-- | arch/sh/mm/Makefile | 1 | ||||
| -rw-r--r-- | arch/sh/mm/sram.c | 34 |
4 files changed, 77 insertions, 0 deletions
diff --git a/arch/sh/include/asm/sram.h b/arch/sh/include/asm/sram.h new file mode 100644 index 00000000000..a2808ce4c0a --- /dev/null +++ b/arch/sh/include/asm/sram.h @@ -0,0 +1,38 @@ +#ifndef __ASM_SRAM_H +#define __ASM_SRAM_H + +#ifdef CONFIG_HAVE_SRAM_POOL + +#include <linux/spinlock.h> +#include <linux/genalloc.h> + +/* arch/sh/mm/sram.c */ +extern struct gen_pool *sram_pool; + +static inline unsigned long sram_alloc(size_t len) +{ + if (!sram_pool) + return 0UL; + + return gen_pool_alloc(sram_pool, len); +} + +static inline void sram_free(unsigned long addr, size_t len) +{ + return gen_pool_free(sram_pool, addr, len); +} + +#else + +static inline unsigned long sram_alloc(size_t len) +{ + return 0; +} + +static inline void sram_free(unsigned long addr, size_t len) +{ +} + +#endif /* CONFIG_HAVE_SRAM_POOL */ + +#endif /* __ASM_SRAM_H */ diff --git a/arch/sh/mm/Kconfig b/arch/sh/mm/Kconfig index 1445ca6257d..09370392aff 100644 --- a/arch/sh/mm/Kconfig +++ b/arch/sh/mm/Kconfig @@ -168,6 +168,10 @@ config IOREMAP_FIXED config UNCACHED_MAPPING bool +config HAVE_SRAM_POOL + bool + select GENERIC_ALLOCATOR + choice prompt "Kernel page size" default PAGE_SIZE_4KB diff --git a/arch/sh/mm/Makefile b/arch/sh/mm/Makefile index 939663c5591..ab89ea4f941 100644 --- a/arch/sh/mm/Makefile +++ b/arch/sh/mm/Makefile @@ -40,6 +40,7 @@ obj-$(CONFIG_PMB) += pmb.o obj-$(CONFIG_NUMA) += numa.o obj-$(CONFIG_IOREMAP_FIXED) += ioremap_fixed.o obj-$(CONFIG_UNCACHED_MAPPING) += uncached.o +obj-$(CONFIG_HAVE_SRAM_POOL) += sram.o # Special flags for fault_64.o. This puts restrictions on the number of # caller-save registers that the compiler can target when building this file. diff --git a/arch/sh/mm/sram.c b/arch/sh/mm/sram.c new file mode 100644 index 00000000000..bc156ec4545 --- /dev/null +++ b/arch/sh/mm/sram.c @@ -0,0 +1,34 @@ +/* + * SRAM pool for tiny memories not otherwise managed. + * + * Copyright (C) 2010 Paul Mundt + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ +#include <linux/init.h> +#include <linux/kernel.h> +#include <asm/sram.h> + +/* + * This provides a standard SRAM pool for tiny memories that can be + * added either by the CPU or the platform code. Typical SRAM sizes + * to be inserted in to the pool will generally be less than the page + * size, with anything more reasonably sized handled as a NUMA memory + * node. + */ +struct gen_pool *sram_pool; + +static int __init sram_pool_init(void) +{ + /* + * This is a global pool, we don't care about node locality. + */ + sram_pool = gen_pool_create(1, -1); + if (unlikely(!sram_pool)) + return -ENOMEM; + + return 0; +} +core_initcall(sram_pool_init); |