Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752863AbaBCHYJ (ORCPT ); Mon, 3 Feb 2014 02:24:09 -0500 Received: from mail1.bemta3.messagelabs.com ([195.245.230.164]:30180 "EHLO mail1.bemta3.messagelabs.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751211AbaBCHYH (ORCPT ); Mon, 3 Feb 2014 02:24:07 -0500 X-Greylist: delayed 422 seconds by postgrey-1.27 at vger.kernel.org; Mon, 03 Feb 2014 02:24:07 EST X-Env-Sender: michael.moese@men.de X-Msg-Ref: server-12.tower-38.messagelabs.com!1391411820!12479082!1 X-Originating-IP: [80.255.6.145] X-StarScan-Received: X-StarScan-Version: 6.9.16; banners=-,-,- X-VirusChecked: Checked X-PGP-Universal: processed; by keys.men.de on Mon, 03 Feb 2014 08:17:01 +0100 From: Michael Moese To: Benjamin Herrenschmidt , Paul Mackerras CC: Michael Moese , , 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> X-Mailer: git-send-email 1.8.5.3 MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [192.168.6.61] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 -- 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/