Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757803AbZCWN5x (ORCPT ); Mon, 23 Mar 2009 09:57:53 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752975AbZCWN5n (ORCPT ); Mon, 23 Mar 2009 09:57:43 -0400 Received: from mx1.emlix.com ([193.175.82.87]:46538 "EHLO mx1.emlix.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752853AbZCWN5n (ORCPT ); Mon, 23 Mar 2009 09:57:43 -0400 From: Oskar Schirmer To: Chris Zankel Cc: linux-kernel@vger.kernel.org, linux-xtensa@linux-xtensa.org, Oskar Schirmer Subject: [patch 1/2] xtensa: cache inquiry and unaligned cache handling functions Date: Mon, 23 Mar 2009 14:58:42 +0100 Message-Id: <1237816723-29041-1-git-send-email-os@emlix.com> Organization: emlix gmbh, Goettingen, Germany" Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3334 Lines: 124 The existing xtensa cache handling functions work on page-aligned memory regions. These functions are needed for the s6000 dma engine which can work on a byte-granularity. Signed-off-by: Oskar Schirmer --- arch/xtensa/include/asm/cacheflush.h | 95 ++++++++++++++++++++++++++++++++++ 1 files changed, 95 insertions(+), 0 deletions(-) diff --git a/arch/xtensa/include/asm/cacheflush.h b/arch/xtensa/include/asm/cacheflush.h index 8fc1c0c..b7b8fbe 100644 --- a/arch/xtensa/include/asm/cacheflush.h +++ b/arch/xtensa/include/asm/cacheflush.h @@ -155,5 +155,100 @@ extern void copy_from_user_page(struct vm_area_struct*, struct page*, #endif +#define XTENSA_CACHEBLK_LOG2 29 +#define XTENSA_CACHEBLK_SIZE (1 << XTENSA_CACHEBLK_LOG2) +#define XTENSA_CACHEBLK_MASK (7 << XTENSA_CACHEBLK_LOG2) + +#if XCHAL_HAVE_CACHEATTR +static inline u32 xtensa_get_cacheattr(void) +{ + u32 r; + asm volatile(" rsr %0, CACHEATTR" : "=a"(r)); + return r; +} + +static inline u32 xtensa_get_dtlb1(u32 addr) +{ + u32 r = addr & XTENSA_CACHEBLK_MASK; + return r | ((xtensa_get_cacheattr() >> (r >> (XTENSA_CACHEBLK_LOG2-2))) + & 0xF); +} +#else +static inline u32 xtensa_get_dtlb1(u32 addr) +{ + u32 r; + asm volatile(" rdtlb1 %0, %1" : "=a"(r) : "a"(addr)); + asm volatile(" dsync"); + return r; +} + +static inline u32 xtensa_get_cacheattr(void) +{ + u32 r = 0; + u32 a = 0; + do { + a -= XTENSA_CACHEBLK_SIZE; + r = (r << 4) | (xtensa_get_dtlb1(a) & 0xF); + } while (a); + return r; +} +#endif + +static inline int xtensa_need_flush_dma_source(u32 addr) +{ + return (xtensa_get_dtlb1(addr) & ((1 << XCHAL_CA_BITS) - 1)) >= 4; +} + +static inline int xtensa_need_invalidate_dma_destination(u32 addr) +{ + return (xtensa_get_dtlb1(addr) & ((1 << XCHAL_CA_BITS) - 1)) != 2; +} + +static inline void flush_dcache_unaligned(u32 addr, u32 size) +{ + u32 cnt; + if (size) { + cnt = (size + ((XCHAL_DCACHE_LINESIZE - 1) & addr) + + XCHAL_DCACHE_LINESIZE - 1) / XCHAL_DCACHE_LINESIZE; + while (cnt--) { + asm volatile(" dhwb %0, 0" : : "a"(addr)); + addr += XCHAL_DCACHE_LINESIZE; + } + asm volatile(" dsync"); + } +} + +static inline void invalidate_dcache_unaligned(u32 addr, u32 size) +{ + int cnt; + if (size) { + asm volatile(" dhwbi %0, 0 ;" : : "a"(addr)); + cnt = (size + ((XCHAL_DCACHE_LINESIZE - 1) & addr) + - XCHAL_DCACHE_LINESIZE - 1) / XCHAL_DCACHE_LINESIZE; + while (cnt-- > 0) { + asm volatile(" dhi %0, %1" : : "a"(addr), + "n"(XCHAL_DCACHE_LINESIZE)); + addr += XCHAL_DCACHE_LINESIZE; + } + asm volatile(" dhwbi %0, %1" : : "a"(addr), + "n"(XCHAL_DCACHE_LINESIZE)); + asm volatile(" dsync"); + } +} + +static inline void flush_invalidate_dcache_unaligned(u32 addr, u32 size) +{ + u32 cnt; + if (size) { + cnt = (size + ((XCHAL_DCACHE_LINESIZE - 1) & addr) + + XCHAL_DCACHE_LINESIZE - 1) / XCHAL_DCACHE_LINESIZE; + while (cnt--) { + asm volatile(" dhwbi %0, 0" : : "a"(addr)); + addr += XCHAL_DCACHE_LINESIZE; + } + asm volatile(" dsync"); + } +} + #endif /* __KERNEL__ */ #endif /* _XTENSA_CACHEFLUSH_H */ -- 1.6.2.107.ge47ee -- 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/