From patchwork Fri Jun 14 08:06:22 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Huang Shijie X-Patchwork-Id: 251266 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:770:15f::2]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id 412F12C007B for ; Fri, 14 Jun 2013 18:33:41 +1000 (EST) Received: from merlin.infradead.org ([2001:4978:20e::2]) by casper.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1UnPPI-0003Zv-Dm; Fri, 14 Jun 2013 08:30:52 +0000 Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1UnPOe-0001LV-Ep; Fri, 14 Jun 2013 08:30:12 +0000 Received: from co9ehsobe005.messaging.microsoft.com ([207.46.163.28] helo=co9outboundpool.messaging.microsoft.com) by merlin.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1UnPNo-0001EI-Di; Fri, 14 Jun 2013 08:29:22 +0000 Received: from mail145-co9-R.bigfish.com (10.236.132.229) by CO9EHSOBE018.bigfish.com (10.236.130.81) with Microsoft SMTP Server id 14.1.225.23; Fri, 14 Jun 2013 08:28:53 +0000 Received: from mail145-co9 (localhost [127.0.0.1]) by mail145-co9-R.bigfish.com (Postfix) with ESMTP id 39B18480391; Fri, 14 Jun 2013 08:28:53 +0000 (UTC) X-Forefront-Antispam-Report: CIP:70.37.183.190; KIP:(null); UIP:(null); IPV:NLI; H:mail.freescale.net; RD:none; EFVD:NLI X-SpamScore: 3 X-BigFish: VS3(zzzz1f42h1ee6h1de0h1fdah1202h1e76h1d1ah1d2ah1fc6h1082kzz8275bhz2dh2a8h668h839hd24he5bhf0ah1288h12a5h12a9h12bdh12e5h137ah139eh13b6h1441h1504h1537h162dh1631h1758h1898h18e1h1946h19b5h1ad9h1b0ah1d0ch1d2eh1d3fh1dfeh1dffh1e23h1155h) Received: from mail145-co9 (localhost.localdomain [127.0.0.1]) by mail145-co9 (MessageSwitch) id 137119853140355_9031; Fri, 14 Jun 2013 08:28:51 +0000 (UTC) Received: from CO9EHSMHS005.bigfish.com (unknown [10.236.132.246]) by mail145-co9.bigfish.com (Postfix) with ESMTP id 075603C005E; Fri, 14 Jun 2013 08:28:51 +0000 (UTC) Received: from mail.freescale.net (70.37.183.190) by CO9EHSMHS005.bigfish.com (10.236.130.15) with Microsoft SMTP Server (TLS) id 14.1.225.23; Fri, 14 Jun 2013 08:28:50 +0000 Received: from tx30smr01.am.freescale.net (10.81.153.31) by 039-SN1MMR1-003.039d.mgd.msft.net (10.84.1.16) with Microsoft SMTP Server (TLS) id 14.2.328.11; Fri, 14 Jun 2013 08:28:50 +0000 Received: from shlinux2.ap.freescale.net (shlinux2.ap.freescale.net [10.192.224.44]) by tx30smr01.am.freescale.net (8.14.3/8.14.0) with ESMTP id r5E8SelG024613; Fri, 14 Jun 2013 01:28:47 -0700 From: Huang Shijie To: Subject: [PATCH 1/4] mtd: gpmi: decouple the chip select from the DMA channel Date: Fri, 14 Jun 2013 16:06:22 +0800 Message-ID: <1371197185-27491-2-git-send-email-b32955@freescale.com> X-Mailer: git-send-email 1.7.1 In-Reply-To: <1371197185-27491-1-git-send-email-b32955@freescale.com> References: <1371197185-27491-1-git-send-email-b32955@freescale.com> MIME-Version: 1.0 X-OriginatorOrg: freescale.com X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20130614_042920_846127_FAF9A506 X-CRM114-Status: GOOD ( 10.55 ) X-Spam-Score: -4.2 (----) X-Spam-Report: SpamAssassin version 3.3.2 on merlin.infradead.org summary: Content analysis details: (-4.2 points) pts rule name description ---- ---------------------- -------------------------------------------------- -2.3 RCVD_IN_DNSWL_MED RBL: Sender listed at http://www.dnswl.org/, medium trust [207.46.163.28 listed in list.dnswl.org] -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] Cc: Huang Shijie , linux-mtd@lists.infradead.org, linux-arm-kernel@lists.infradead.org, dedekind1@gmail.com X-BeenThere: linux-mtd@lists.infradead.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-mtd" Errors-To: linux-mtd-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org Decouple the chip select from the DMA channel, we use the DMA channel 0 to accecc all the nand devices. Signed-off-by: Huang Shijie --- drivers/mtd/nand/gpmi-nand/gpmi-lib.c | 6 ++++++ drivers/mtd/nand/gpmi-nand/gpmi-regs.h | 3 +++ 2 files changed, 9 insertions(+), 0 deletions(-) diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-lib.c b/drivers/mtd/nand/gpmi-nand/gpmi-lib.c index 4f8857f..7d56d87 100644 --- a/drivers/mtd/nand/gpmi-nand/gpmi-lib.c +++ b/drivers/mtd/nand/gpmi-nand/gpmi-lib.c @@ -187,6 +187,12 @@ int gpmi_init(struct gpmi_nand_data *this) /* Select BCH ECC. */ writel(BM_GPMI_CTRL1_BCH_MODE, r->gpmi_regs + HW_GPMI_CTRL1_SET); + /* + * Decouple the chip select from dma channel. We use dma0 for all + * the chips. + */ + writel(BM_GPMI_CTRL1_DECOUPLE_CS, r->gpmi_regs + HW_GPMI_CTRL1_SET); + gpmi_disable_clk(this); return 0; err_out: diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-regs.h b/drivers/mtd/nand/gpmi-nand/gpmi-regs.h index 53397cc..82114cd 100644 --- a/drivers/mtd/nand/gpmi-nand/gpmi-regs.h +++ b/drivers/mtd/nand/gpmi-nand/gpmi-regs.h @@ -108,6 +108,9 @@ #define HW_GPMI_CTRL1_CLR 0x00000068 #define HW_GPMI_CTRL1_TOG 0x0000006c +#define BP_GPMI_CTRL1_DECOUPLE_CS 24 +#define BM_GPMI_CTRL1_DECOUPLE_CS (1 << BP_GPMI_CTRL1_DECOUPLE_CS) + #define BP_GPMI_CTRL1_WRN_DLY_SEL 22 #define BM_GPMI_CTRL1_WRN_DLY_SEL (0x3 << BP_GPMI_CTRL1_WRN_DLY_SEL) #define BF_GPMI_CTRL1_WRN_DLY_SEL(v) \