From patchwork Mon Nov 2 01:40:39 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Simon Horman X-Patchwork-Id: 7532901 X-Patchwork-Delegate: horms@verge.net.au Return-Path: X-Original-To: patchwork-linux-sh@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id EE77B9F327 for ; Mon, 2 Nov 2015 01:41:07 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 1F34F203EC for ; Mon, 2 Nov 2015 01:41:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id F27D0203DC for ; Mon, 2 Nov 2015 01:41:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751250AbbKBBlF (ORCPT ); Sun, 1 Nov 2015 20:41:05 -0500 Received: from kirsty.vergenet.net ([202.4.237.240]:51578 "EHLO kirsty.vergenet.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751076AbbKBBlD (ORCPT ); Sun, 1 Nov 2015 20:41:03 -0500 Received: from reginn.isobedori.kobe.vergenet.net (p2250-ipbfp1101kobeminato.hyogo.ocn.ne.jp [122.22.210.250]) by kirsty.vergenet.net (Postfix) with ESMTPA id 36CC525B79F; Mon, 2 Nov 2015 12:41:02 +1100 (AEDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=verge.net.au; s=mail; t=1446428462; bh=ZENQv8jG97sSzBqSNQjJ0KKg+xYNepts8CV31CTWuZA=; h=From:To:Cc:Subject:Date:From; b=EvZkdxnVfO90/FrbblVA975e6z19Qr4Z7u4K383QO2SWfyY8mUJh2OE7Qo+I7i0fo LitFlb4LIU1CpQ0LKFWr9Ng+jmKydc6eK5IxAO+ZHqAxmuQuJb+uGNITQiT5zWGuLc 9YTH5NxXg6LguN46hEhnxULaQ/9v+294PTbFCtnQ= Received: by reginn.isobedori.kobe.vergenet.net (Postfix, from userid 7100) id F19E59403CB; Mon, 2 Nov 2015 10:40:58 +0900 (JST) From: Simon Horman To: David Miller , netdev@vger.kernel.org, linux-sh@vger.kernel.org Cc: Magnus Damm Subject: [PATCH/RFC net-next] ravb: use clock rate as basis for GTI.TIV Date: Mon, 2 Nov 2015 10:40:39 +0900 Message-Id: <1446428439-10944-1-git-send-email-horms+renesas@verge.net.au> X-Mailer: git-send-email 2.1.4 Sender: linux-sh-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-sh@vger.kernel.org X-Spam-Status: No, score=-6.8 required=5.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_HI,T_DKIM_INVALID,T_RP_MATCHES_RCVD,UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP The GTI.TIV may be set to 2GHz^2 / rate, where rate is that of the clock of the device. Rather than assuming a rate of 130MHz use the actual rate of the clock. The motivation for this is to use the correct rate on the r8a7795/Slavator-X which is advertised as 133MHz but may differ depending on the extal present on the Slavator-X. Signed-off-by: Simon Horman --- Tested on the topic/gen3-latest branch of Geert Uytterhoeven's renesas-drivers tree on kernel.org: 3f5a88be9fea ("[WIP] arm64: renesas: r8a7795: Convert to new CPG/MSSR bindings") --- drivers/net/ethernet/renesas/ravb.h | 3 +++ drivers/net/ethernet/renesas/ravb_main.c | 35 +++++++++++++++++++++++++++++++- 2 files changed, 37 insertions(+), 1 deletion(-) diff --git a/drivers/net/ethernet/renesas/ravb.h b/drivers/net/ethernet/renesas/ravb.h index 0623fff932e4..f9dee7436e81 100644 --- a/drivers/net/ethernet/renesas/ravb.h +++ b/drivers/net/ethernet/renesas/ravb.h @@ -576,6 +576,9 @@ enum GTI_BIT { GTI_TIV = 0x0FFFFFFF, }; +#define GTI_TIV_MAX GTI_TIV +#define GTI_TIV_MIN 0x20 + /* GIC */ enum GIC_BIT { GIC_PTCE = 0x00000001, /* Undocumented? */ diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c index 8cc5ec5ed19a..af52c88b8b8f 100644 --- a/drivers/net/ethernet/renesas/ravb_main.c +++ b/drivers/net/ethernet/renesas/ravb_main.c @@ -1659,6 +1659,37 @@ static const struct of_device_id ravb_match_table[] = { }; MODULE_DEVICE_TABLE(of, ravb_match_table); +static int ravb_set_gti(struct net_device *ndev) +{ + + struct device *dev = ndev->dev.parent; + struct device_node *np = dev->of_node; + unsigned long long rate; + unsigned long inc; + struct clk *clk; + + clk = of_clk_get(np, 0); + if (IS_ERR(clk)) { + dev_err(dev, "could not get clock\n"); + return PTR_ERR(clk); + } + + rate = clk_get_rate(clk); + clk_put(clk); + + inc = (1000000000ULL << 20) / rate; + + if (inc < GTI_TIV_MIN || inc > GTI_TIV_MAX) { + dev_err(dev, "gti.tiv increment 0x%lx is outside the range 0x%x - 0x%x\n", + inc, GTI_TIV_MIN, GTI_TIV_MAX); + return -EINVAL; + } + + ravb_write(ndev, inc, GTI); + + return 0; +} + static int ravb_probe(struct platform_device *pdev) { struct device_node *np = pdev->dev.of_node; @@ -1755,7 +1786,9 @@ static int ravb_probe(struct platform_device *pdev) CCC); /* Set GTI value */ - ravb_write(ndev, ((1000 << 20) / 130) & GTI_TIV, GTI); + error = ravb_set_gti(ndev); + if (error) + goto out_release; /* Request GTI loading */ ravb_write(ndev, ravb_read(ndev, GCCR) | GCCR_LTI, GCCR);