Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754932Ab2H3S3r (ORCPT ); Thu, 30 Aug 2012 14:29:47 -0400 Received: from bosmailout13.eigbox.net ([66.96.188.13]:35575 "EHLO bosmailout13.eigbox.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754920Ab2H3S3n (ORCPT ); Thu, 30 Aug 2012 14:29:43 -0400 X-Greylist: delayed 2375 seconds by postgrey-1.27 at vger.kernel.org; Thu, 30 Aug 2012 14:29:43 EDT X-Authority-Analysis: v=2.0 cv=aPZHX8Bm c=1 sm=1 a=EVDLJLhrg0sUKeqAW2r0xw==:17 a=bc2JKO6qiGsA:10 a=tW0haWE2Y5YA:10 a=W6MEt8fMaIAA:10 a=8nJEP1OIZ-IA:10 a=B_w90FyZ_4cA:10 a=bJ0fqD8TFZgqkSadqForXVIPBlU=:19 a=LfFflyyhb7Rfm_sXAqwA:9 a=wPNLvfGTeEIA:10 a=jcMFiYeD4Gz02xRQ37rMPA==:117 X-EN-OrigOutIP: 10.20.18.4 X-EN-IMPSID: t5q61j00H05GATN015q65f Message-ID: <503FA259.3090602@yahoo.es> Date: Fri, 31 Aug 2012 01:26:49 +0800 From: Hein Tibosch User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:15.0) Gecko/20120824 Thunderbird/15.0 MIME-Version: 1.0 To: viresh kumar CC: spear-devel , Linux Kernel Mailing List , "ludovic.desroches" , Havard Skinnemoen , Nicolas Ferre , Hans-Christian Egtvedt , Andrew Morton , Arnd Bergmann Subject: [PATCH v2 1/2] dw_dmac: make driver endianness configurable Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit X-EN-UserInfo: 3946c951b80c12a8be5482963a0b1232:e0ae43bc192b431f8b69f09a37527cbc X-EN-AuthUser: hein@htibosch.net X-EN-OrigIP: 114.79.60.254 X-EN-OrigHost: unknown Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2838 Lines: 84 The dw_dmac was originally developed for avr32 to be used with the Synopsys DesignWare AHB DMA controller. After 2.6.38, device access was done with the little-endian readl/writel functions. This didn't work on the avr32 platform, because it needs native-endian (i.e. big-endian) accessors. This patch makes the endianness configurable using 'DW_DMAC_BIG_ENDIAN_IO', which will default be true for AVR32 Signed-off-by: Hein Tibosch --- drivers/dma/Kconfig | 11 +++++++++++ drivers/dma/dw_dmac_regs.h | 14 ++++++++++++++ 2 files changed, 25 insertions(+), 0 deletions(-) diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig index aadeb5b..a9f6781 100644 --- a/drivers/dma/Kconfig +++ b/drivers/dma/Kconfig @@ -89,6 +89,17 @@ config DW_DMAC Support the Synopsys DesignWare AHB DMA controller. This can be integrated in chips such as the Atmel AT32ap7000. +config DW_DMAC_BIG_ENDIAN_IO + bool "Use big endian I/O register access" + default y if AVR32 + depends on DW_DMAC + help + Say yes here to use big endian I/O access when reading and writing + to the DMA controller registers. This is needed on some platforms, + like the Atmel AVR32 architecture. + + If unsure, use the default setting. + config AT_HDMAC tristate "Atmel AHB DMA support" depends on ARCH_AT91 diff --git a/drivers/dma/dw_dmac_regs.h b/drivers/dma/dw_dmac_regs.h index f298f69..9758651 100644 --- a/drivers/dma/dw_dmac_regs.h +++ b/drivers/dma/dw_dmac_regs.h @@ -175,10 +175,17 @@ __dwc_regs(struct dw_dma_chan *dwc) return dwc->ch_regs; } +#ifdef CONFIG_DW_DMAC_BIG_ENDIAN_IO +#define channel_readl(dwc, name) \ + ioread32be(&(__dwc_regs(dwc)->name)) +#define channel_writel(dwc, name, val) \ + iowrite32be((val), &(__dwc_regs(dwc)->name)) +#else #define channel_readl(dwc, name) \ readl(&(__dwc_regs(dwc)->name)) #define channel_writel(dwc, name, val) \ writel((val), &(__dwc_regs(dwc)->name)) +#endif static inline struct dw_dma_chan *to_dw_dma_chan(struct dma_chan *chan) { @@ -201,10 +208,17 @@ static inline struct dw_dma_regs __iomem *__dw_regs(struct dw_dma *dw) return dw->regs; } +#ifdef CONFIG_DW_DMAC_BIG_ENDIAN_IO +#define dma_readl(dwc, name) \ + ioread32be(&(__dw_regs(dw)->name)) +#define dma_writel(dwc, name, val) \ + iowrite32be((val), &(__dw_regs(dw)->name)) +#else #define dma_readl(dw, name) \ readl(&(__dw_regs(dw)->name)) #define dma_writel(dw, name, val) \ writel((val), &(__dw_regs(dw)->name)) +#endif #define channel_set_bit(dw, reg, mask) \ dma_writel(dw, reg, ((mask) << 8) | (mask)) -- 1.7.8.0 -- 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/