From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mail-la0-x230.google.com ([2a00:1450:4010:c03::230]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1ZV5bA-0004AA-QI for barebox@lists.infradead.org; Thu, 27 Aug 2015 22:24:45 +0000 Received: by labia3 with SMTP id ia3so21640420lab.3 for ; Thu, 27 Aug 2015 15:24:23 -0700 (PDT) From: Antony Pavlov Date: Fri, 28 Aug 2015 01:24:04 +0300 Message-Id: <1440714250-28080-4-git-send-email-antonynpavlov@gmail.com> In-Reply-To: <1440714250-28080-1-git-send-email-antonynpavlov@gmail.com> References: <1440714250-28080-1-git-send-email-antonynpavlov@gmail.com> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "barebox" Errors-To: barebox-bounces+u.kleine-koenig=pengutronix.de@lists.infradead.org Subject: [RFC 3/9] MIPS: add virt_to_phys() and phys_to_virt() To: barebox@lists.infradead.org Cc: Peter Mamonov N.B. phys_to_virt() translates phys address to KSEG1 (uncached) address as barebox mips has no cache support. Signed-off-by: Antony Pavlov --- arch/mips/include/asm/io.h | 35 +++++++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+) diff --git a/arch/mips/include/asm/io.h b/arch/mips/include/asm/io.h index 4832be6..26605a7 100644 --- a/arch/mips/include/asm/io.h +++ b/arch/mips/include/asm/io.h @@ -12,8 +12,43 @@ #include #include +#include #include +/* + * virt_to_phys - map virtual addresses to physical + * @address: address to remap + * + * The returned physical address is the physical (CPU) mapping for + * the memory address given. It is only valid to use this function on + * addresses directly mapped or allocated via kmalloc. + * + * This function does not give bus mappings for DMA transfers. In + * almost all conceivable cases a device driver should not be using + * this function + */ +static inline unsigned long virt_to_phys(const void *address) +{ + return (unsigned long)address & 0x3fffffff; +} + +/* + * phys_to_virt - map physical address to virtual + * @address: address to remap + * + * The returned virtual address is a current CPU mapping for + * the memory address given. It is only valid to use this function on + * addresses that have a kernel mapping + * + * This function does not handle bus mappings for DMA transfers. In + * almost all conceivable cases a device driver should not be using + * this function + */ +static inline void *phys_to_virt(unsigned long address) +{ + return (void *)(KSEG1 | (address & 0x3fffffff)); +} + #define IO_SPACE_LIMIT 0 /*****************************************************************************/ -- 2.5.0 _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox