From patchwork Tue Nov 8 14:13:32 2011 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jamie Iles X-Patchwork-Id: 124378 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 2B5BFB6F92 for ; Wed, 9 Nov 2011 01:14:25 +1100 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932593Ab1KHOOO (ORCPT ); Tue, 8 Nov 2011 09:14:14 -0500 Received: from mail-ey0-f174.google.com ([209.85.215.174]:37644 "EHLO mail-ey0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932544Ab1KHOOC (ORCPT ); Tue, 8 Nov 2011 09:14:02 -0500 Received: by eye27 with SMTP id 27so372674eye.19 for ; Tue, 08 Nov 2011 06:14:00 -0800 (PST) Received: by 10.180.75.204 with SMTP id e12mr12993030wiw.61.1320761640063; Tue, 08 Nov 2011 06:14:00 -0800 (PST) Received: from localhost ([94.72.250.67]) by mx.google.com with ESMTPS id ca18sm928695wib.13.2011.11.08.06.13.59 (version=TLSv1/SSLv3 cipher=OTHER); Tue, 08 Nov 2011 06:13:59 -0800 (PST) From: Jamie Iles To: netdev@vger.kernel.org Cc: arnd@arndb.de, Jamie Iles Subject: [PATCHv4 8/9] macb: support DMA bus widths > 32 bits Date: Tue, 8 Nov 2011 14:13:32 +0000 Message-Id: <1320761613-18641-9-git-send-email-jamie@jamieiles.com> X-Mailer: git-send-email 1.7.4.1 In-Reply-To: <1320761613-18641-1-git-send-email-jamie@jamieiles.com> References: <1320761613-18641-1-git-send-email-jamie@jamieiles.com> Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Some GEM implementations may support DMA bus widths up to 128 bits. We can get the maximum supported DMA bus width from the design configuration register so use that to program the device up. Signed-off-by: Jamie Iles Acked-by: David S. Miller Acked-by: Nicolas Ferre --- drivers/net/ethernet/cadence/macb.c | 23 +++++++++++++++++++++++ drivers/net/ethernet/cadence/macb.h | 19 +++++++++++++++++++ 2 files changed, 42 insertions(+), 0 deletions(-) diff --git a/drivers/net/ethernet/cadence/macb.c b/drivers/net/ethernet/cadence/macb.c index ecfe98a..3194af2 100644 --- a/drivers/net/ethernet/cadence/macb.c +++ b/drivers/net/ethernet/cadence/macb.c @@ -836,6 +836,27 @@ static u32 macb_mdc_clk_div(struct macb *bp) return config; } +/* + * Get the DMA bus width field of the network configuration register that we + * should program. We find the width from decoding the design configuration + * register to find the maximum supported data bus width. + */ +static u32 macb_dbw(struct macb *bp) +{ + if (!macb_is_gem(bp)) + return 0; + + switch (GEM_BFEXT(DBWDEF, gem_readl(bp, DCFG1))) { + case 4: + return GEM_BF(DBW, GEM_DBW128); + case 2: + return GEM_BF(DBW, GEM_DBW64); + case 1: + default: + return GEM_BF(DBW, GEM_DBW32); + } +} + static void macb_init_hw(struct macb *bp) { u32 config; @@ -851,6 +872,7 @@ static void macb_init_hw(struct macb *bp) config |= MACB_BIT(CAF); /* Copy All Frames */ if (!(bp->dev->flags & IFF_BROADCAST)) config |= MACB_BIT(NBC); /* No BroadCast */ + config |= macb_dbw(bp); macb_writel(bp, NCFGR, config); /* Initialize TX and RX buffers */ @@ -1277,6 +1299,7 @@ static int __init macb_probe(struct platform_device *pdev) /* Set MII management clock divider */ config = macb_mdc_clk_div(bp); + config |= macb_dbw(bp); macb_writel(bp, NCFGR, config); macb_get_hwaddr(bp); diff --git a/drivers/net/ethernet/cadence/macb.h b/drivers/net/ethernet/cadence/macb.h index 1367b92..71424aa 100644 --- a/drivers/net/ethernet/cadence/macb.h +++ b/drivers/net/ethernet/cadence/macb.h @@ -69,6 +69,13 @@ #define GEM_SA1B 0x0088 #define GEM_SA1T 0x008C #define GEM_OTX 0x0100 +#define GEM_DCFG1 0x0280 +#define GEM_DCFG2 0x0284 +#define GEM_DCFG3 0x0288 +#define GEM_DCFG4 0x028c +#define GEM_DCFG5 0x0290 +#define GEM_DCFG6 0x0294 +#define GEM_DCFG7 0x0298 /* Bitfields in NCR */ #define MACB_LB_OFFSET 0 @@ -139,6 +146,14 @@ /* GEM specific NCFGR bitfields. */ #define GEM_CLK_OFFSET 18 #define GEM_CLK_SIZE 3 +#define GEM_DBW_OFFSET 21 +#define GEM_DBW_SIZE 2 + +/* Constants for data bus width. */ +#define GEM_DBW32 0 +#define GEM_DBW64 1 +#define GEM_DBW128 2 + /* Bitfields in NSR */ #define MACB_NSR_LINK_OFFSET 0 #define MACB_NSR_LINK_SIZE 1 @@ -247,6 +262,10 @@ #define MACB_REV_OFFSET 0 #define MACB_REV_SIZE 16 +/* Bitfields in DCFG1. */ +#define GEM_DBWDEF_OFFSET 25 +#define GEM_DBWDEF_SIZE 3 + /* Constants for CLK */ #define MACB_CLK_DIV8 0 #define MACB_CLK_DIV16 1