From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail1.bemta3.messagelabs.com (mail1.bemta3.messagelabs.com [195.245.230.164]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 407732C0078 for ; Mon, 3 Feb 2014 18:24:17 +1100 (EST) From: Michael Moese To: Benjamin Herrenschmidt , Paul Mackerras Subject: [RFC PATCH] powerpc: add ioremap_wt Date: Mon, 3 Feb 2014 08:16:49 +0100 Message-ID: <1391411809-1845-1-git-send-email-michael.moese@men.de> MIME-Version: 1.0 Content-Type: text/plain Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, Michael Moese List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Allow for IO memory to be mapped cacheable for performing PCI read bursts. Signed-off-by: Michael Moese --- arch/powerpc/include/asm/io.h | 3 +++ arch/powerpc/mm/pgtable_32.c | 8 ++++++++ 2 files changed, 11 insertions(+) diff --git a/arch/powerpc/include/asm/io.h b/arch/powerpc/include/asm/io.h index 45698d5..9591fff 100644 --- a/arch/powerpc/include/asm/io.h +++ b/arch/powerpc/include/asm/io.h @@ -631,6 +631,8 @@ static inline void iosync(void) * * * ioremap_wc enables write combining * + * * ioremap_wc enables write thru + * * * iounmap undoes such a mapping and can be hooked * * * __ioremap_at (and the pending __iounmap_at) are low level functions to @@ -652,6 +654,7 @@ extern void __iomem *ioremap(phys_addr_t address, unsigned long size); extern void __iomem *ioremap_prot(phys_addr_t address, unsigned long size, unsigned long flags); extern void __iomem *ioremap_wc(phys_addr_t address, unsigned long size); +extern void __iomem *ioremap_wt(phys_addr_t address, unsigned long size); #define ioremap_nocache(addr, size) ioremap((addr), (size)) extern void iounmap(volatile void __iomem *addr); diff --git a/arch/powerpc/mm/pgtable_32.c b/arch/powerpc/mm/pgtable_32.c index 51f8795..9ab0a54 100644 --- a/arch/powerpc/mm/pgtable_32.c +++ b/arch/powerpc/mm/pgtable_32.c @@ -141,6 +141,14 @@ ioremap_wc(phys_addr_t addr, unsigned long size) EXPORT_SYMBOL(ioremap_wc); void __iomem * +ioremap_wt(phys_addr_t addr, unsigned long size) +{ + return __ioremap_caller(addr, size, _PAGE_WRITETHRU, + __builtin_return_address(0)); +} +EXPORT_SYMBOL(ioremap_wt); + +void __iomem * ioremap_prot(phys_addr_t addr, unsigned long size, unsigned long flags) { /* writeable implies dirty for kernel addresses */ -- 1.8.5.3