This patch introduces support for the PIO mapping API on the ARM architecture. It is currently only meant as an example for discussions and it can be further optimised. Signed-off-by: Catalin Marinas <catalin.marinas@xxxxxxx> --- arch/arm/Kconfig | 3 ++ arch/arm/include/asm/pio-mapping.h | 52 ++++++++++++++++++++++++++++++++++++ 2 files changed, 55 insertions(+), 0 deletions(-) create mode 100644 arch/arm/include/asm/pio-mapping.h diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 4c33ca8..e48adcf 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -161,6 +161,9 @@ config ARCH_MTD_XIP config GENERIC_HARDIRQS_NO__DO_IRQ def_bool y +config HAVE_ARCH_PIO + def_bool y + if OPROFILE config OPROFILE_ARMV6 diff --git a/arch/arm/include/asm/pio-mapping.h b/arch/arm/include/asm/pio-mapping.h new file mode 100644 index 0000000..d7c866a --- /dev/null +++ b/arch/arm/include/asm/pio-mapping.h @@ -0,0 +1,52 @@ +/* + * include/linux/pio-mapping.h + * + * Copyright (C) 2010 ARM Ltd. + * Written by Catalin Marinas <catalin.marinas@xxxxxxx> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#ifndef ASM_PIO_MAPPING_H +#define ASM_PIO_MAPPING_H + +#include <asm/cacheflush.h> + +static inline void *pio_map_single(void *addr, size_t size, + enum pio_data_direction dir) +{ + return addr; +} + +static inline void pio_unmap_single(void *addr, size_t size, + enum pio_data_direction dir) +{ + if (dir == PIO_FROM_DEVICE) + __cpuc_flush_dcache_area(addr, size); +} + +static inline void *pio_map_page(struct page *page, unsigned long offset, + size_t size, enum pio_data_direction dir) +{ + return page_address(page) + offset; +} + +static inline void pio_unmap_page(void *addr, size_t size, + enum pio_data_direction dir) +{ + if (dir == PIO_FROM_DEVICE) + __cpuc_flush_dcache_area(addr, size); +} + +#endif /* ASM_PIO_MAPPING_H */ -- To unsubscribe from this list: send the line "unsubscribe linux-arch" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html