From patchwork Sun May 17 00:29:09 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ben Hutchings X-Patchwork-Id: 473105 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 0E26714012C for ; Sun, 17 May 2015 10:29:17 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751468AbbEQA3Q (ORCPT ); Sat, 16 May 2015 20:29:16 -0400 Received: from ducie-dc1.codethink.co.uk ([185.25.241.215]:47267 "EHLO ducie-dc1.codethink.co.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751459AbbEQA3P (ORCPT ); Sat, 16 May 2015 20:29:15 -0400 Received: from localhost (localhost [127.0.0.1]) by ducie-dc1.codethink.co.uk (Postfix) with ESMTP id 29E714609A8; Sun, 17 May 2015 01:29:14 +0100 (BST) X-Virus-Scanned: Debian amavisd-new at ducie-dc1.codethink.co.uk Received: from ducie-dc1.codethink.co.uk ([127.0.0.1]) by localhost (ducie-dc1.codethink.co.uk [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id LloUQaPNqx-1; Sun, 17 May 2015 01:29:11 +0100 (BST) Received: from [192.168.25.61] (unknown [192.168.25.61]) by ducie-dc1.codethink.co.uk (Postfix) with ESMTPSA id 91954461721; Sun, 17 May 2015 01:29:10 +0100 (BST) Message-ID: <1431822549.4222.171.camel@xylophone.i.decadent.org.uk> Subject: [PATCH 4/6] mmc: sh_mobile_sdhi: Add UHS-I mode support From: Ben Hutchings To: Ian Molton , linux-mmc@vger.kernel.org Cc: linux-sh@vger.kernel.org, linux-gpio@vger.kernel.org, linux-kernel@lists.codethink.co.uk, Sergei Shtylyov , Simon Horman Date: Sun, 17 May 2015 01:29:09 +0100 In-Reply-To: <1431822459.4222.166.camel@xylophone.i.decadent.org.uk> References: <1431822459.4222.166.camel@xylophone.i.decadent.org.uk> Organization: Codethink Ltd. X-Mailer: Evolution 3.4.4-3 Mime-Version: 1.0 Sender: linux-gpio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org Implement voltage switch, supporting modes up to SDR-50. Based on work by Shinobu Uehara, Rob Taylor, William Towle and Ian Molton. Signed-off-by: Ben Hutchings --- drivers/mmc/host/sh_mobile_sdhi.c | 58 +++++++++++++++++++++++++++++++++++++ 1 file changed, 58 insertions(+) diff --git a/drivers/mmc/host/sh_mobile_sdhi.c b/drivers/mmc/host/sh_mobile_sdhi.c index 354f4f335ed5..b96d7c084c2e 100644 --- a/drivers/mmc/host/sh_mobile_sdhi.c +++ b/drivers/mmc/host/sh_mobile_sdhi.c @@ -30,6 +30,9 @@ #include #include #include +#include +#include +#include #include "tmio_mmc.h" @@ -86,6 +89,8 @@ struct sh_mobile_sdhi { struct clk *clk; struct tmio_mmc_data mmc_data; struct tmio_mmc_dma dma_priv; + struct pinctrl *pinctrl; + struct pinctrl_state *pinctrl_3v3, *pinctrl_1v8; }; static void sh_mobile_sdhi_sdbuf_width(struct tmio_mmc_host *host, int width) @@ -136,6 +141,47 @@ static void sh_mobile_sdhi_clk_disable(struct platform_device *pdev) clk_disable_unprepare(priv->clk); } +static int sh_mobile_sdhi_start_signal_voltage_switch( + struct tmio_mmc_host *host, unsigned char signal_voltage) +{ + struct sh_mobile_sdhi *priv = host_to_priv(host); + struct pinctrl_state *state; + int min_uV, max_uV; + int ret; + + if (IS_ERR(priv->pinctrl) || IS_ERR(host->mmc->supply.vqmmc)) + return -EOPNOTSUPP; + + switch (signal_voltage) { + case MMC_SIGNAL_VOLTAGE_330: + min_uV = 2700000; + max_uV = 3600000; + state = priv->pinctrl_3v3; + break; + case MMC_SIGNAL_VOLTAGE_180: + min_uV = 1700000; + max_uV = 1950000; + state = priv->pinctrl_1v8; + break; + default: + return -EINVAL; + } + + if (IS_ERR(state)) + return PTR_ERR(state); + + ret = regulator_set_voltage(host->mmc->supply.vqmmc, min_uV, max_uV); + if (ret) + return ret; + + ret = pinctrl_select_state(priv->pinctrl, state); + if (ret) + return ret; + + usleep_range(5000, 5500); + return 0; +} + static int sh_mobile_sdhi_wait_idle(struct tmio_mmc_host *host) { int timeout = 1000; @@ -228,6 +274,14 @@ static int sh_mobile_sdhi_probe(struct platform_device *pdev) goto eprobe; } + priv->pinctrl = devm_pinctrl_get(&pdev->dev); + if (!IS_ERR(priv->pinctrl)) { + priv->pinctrl_3v3 = pinctrl_lookup_state(priv->pinctrl, + PINCTRL_STATE_DEFAULT); + priv->pinctrl_1v8 = pinctrl_lookup_state(priv->pinctrl, + "1v8"); + } + host = tmio_mmc_host_alloc(pdev); if (!host) { ret = -ENOMEM; @@ -239,6 +293,10 @@ static int sh_mobile_sdhi_probe(struct platform_device *pdev) host->clk_enable = sh_mobile_sdhi_clk_enable; host->clk_disable = sh_mobile_sdhi_clk_disable; host->multi_io_quirk = sh_mobile_sdhi_multi_io_quirk; + + host->start_signal_voltage_switch + = sh_mobile_sdhi_start_signal_voltage_switch; + /* SD control register space size is 0x100, 0x200 for bus_shift=1 */ if (resource_size(res) > 0x100) host->bus_shift = 1;