From patchwork Tue Nov 8 14:13:33 2011 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jamie Iles X-Patchwork-Id: 124379 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 B22EEB6F94 for ; Wed, 9 Nov 2011 01:14:25 +1100 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932599Ab1KHOOP (ORCPT ); Tue, 8 Nov 2011 09:14:15 -0500 Received: from mail-wy0-f174.google.com ([74.125.82.174]:63521 "EHLO mail-wy0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932546Ab1KHOOC (ORCPT ); Tue, 8 Nov 2011 09:14:02 -0500 Received: by mail-wy0-f174.google.com with SMTP id 15so512103wyh.19 for ; Tue, 08 Nov 2011 06:14:02 -0800 (PST) Received: by 10.180.18.165 with SMTP id x5mr11158505wid.24.1320761642106; Tue, 08 Nov 2011 06:14:02 -0800 (PST) Received: from localhost ([94.72.250.67]) by mx.google.com with ESMTPS id z5sm933934wix.5.2011.11.08.06.14.01 (version=TLSv1/SSLv3 cipher=OTHER); Tue, 08 Nov 2011 06:14:01 -0800 (PST) From: Jamie Iles To: netdev@vger.kernel.org Cc: arnd@arndb.de, Jamie Iles Subject: [PATCHv4 9/9] macb: allow GEM to have configurable receive buffer size Date: Tue, 8 Nov 2011 14:13:33 +0000 Message-Id: <1320761613-18641-10-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 GEM has configurable receive buffer sizes so requires this to be programmed up. Any size < 2048 and a multiple of 64 bytes is permitted. Signed-off-by: Jamie Iles Acked-by: David S. Miller Acked-by: Nicolas Ferre --- drivers/net/ethernet/cadence/macb.c | 17 +++++++++++++++++ drivers/net/ethernet/cadence/macb.h | 5 +++++ 2 files changed, 22 insertions(+), 0 deletions(-) diff --git a/drivers/net/ethernet/cadence/macb.c b/drivers/net/ethernet/cadence/macb.c index 3194af2..c792f59 100644 --- a/drivers/net/ethernet/cadence/macb.c +++ b/drivers/net/ethernet/cadence/macb.c @@ -857,6 +857,21 @@ static u32 macb_dbw(struct macb *bp) } } +/* + * Configure the receive DMA engine to use the correct receive buffer size. + * This is a configurable parameter for GEM. + */ +static void macb_configure_dma(struct macb *bp) +{ + u32 dmacfg; + + if (macb_is_gem(bp)) { + dmacfg = gem_readl(bp, DMACFG) & ~GEM_BF(RXBS, -1L); + dmacfg |= GEM_BF(RXBS, RX_BUFFER_SIZE / 64); + gem_writel(bp, DMACFG, dmacfg); + } +} + static void macb_init_hw(struct macb *bp) { u32 config; @@ -875,6 +890,8 @@ static void macb_init_hw(struct macb *bp) config |= macb_dbw(bp); macb_writel(bp, NCFGR, config); + macb_configure_dma(bp); + /* Initialize TX and RX buffers */ macb_writel(bp, RBQP, bp->rx_ring_dma); macb_writel(bp, TBQP, bp->tx_ring_dma); diff --git a/drivers/net/ethernet/cadence/macb.h b/drivers/net/ethernet/cadence/macb.h index 71424aa..1931078 100644 --- a/drivers/net/ethernet/cadence/macb.h +++ b/drivers/net/ethernet/cadence/macb.h @@ -64,6 +64,7 @@ /* GEM register offsets. */ #define GEM_NCFGR 0x0004 #define GEM_USRIO 0x000c +#define GEM_DMACFG 0x0010 #define GEM_HRB 0x0080 #define GEM_HRT 0x0084 #define GEM_SA1B 0x0088 @@ -154,6 +155,10 @@ #define GEM_DBW64 1 #define GEM_DBW128 2 +/* Bitfields in DMACFG. */ +#define GEM_RXBS_OFFSET 16 +#define GEM_RXBS_SIZE 8 + /* Bitfields in NSR */ #define MACB_NSR_LINK_OFFSET 0 #define MACB_NSR_LINK_SIZE 1