From patchwork Fri Feb 19 20:16:41 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wolfram Sang X-Patchwork-Id: 8363761 Return-Path: X-Original-To: patchwork-linux-mmc@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 8850CC0553 for ; Fri, 19 Feb 2016 20:17:25 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id AA3EC2047D for ; Fri, 19 Feb 2016 20:17:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B56DF204A9 for ; Fri, 19 Feb 2016 20:17:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2993513AbcBSURU (ORCPT ); Fri, 19 Feb 2016 15:17:20 -0500 Received: from sauhun.de ([89.238.76.85]:40801 "EHLO pokefinder.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2993498AbcBSURT (ORCPT ); Fri, 19 Feb 2016 15:17:19 -0500 Received: from p4fe2573c.dip0.t-ipconnect.de ([79.226.87.60]:49136 helo=localhost) by pokefinder.org with esmtpsa (TLS1.2:RSA_AES_128_CBC_SHA1:128) (Exim 4.80) (envelope-from ) id 1aWrUM-0007iN-17; Fri, 19 Feb 2016 21:17:18 +0100 From: Wolfram Sang To: linux-renesas-soc@vger.kernel.org Cc: linux-mmc@vger.kernel.org, Ben Hutchings , Dirk Behme , Wolfram Sang Subject: [RFC 5/7] mmc: sh_mobile_sdhi: Add UHS-I mode support Date: Fri, 19 Feb 2016 21:16:41 +0100 Message-Id: <1455913003-6140-6-git-send-email-wsa@the-dreams.de> X-Mailer: git-send-email 2.7.0 In-Reply-To: <1455913003-6140-1-git-send-email-wsa@the-dreams.de> References: <1455913003-6140-1-git-send-email-wsa@the-dreams.de> Sender: linux-mmc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mmc@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, 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 From: Ben Hutchings 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 Signed-off-by: Wolfram Sang --- drivers/mmc/host/sh_mobile_sdhi.c | 57 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 57 insertions(+) diff --git a/drivers/mmc/host/sh_mobile_sdhi.c b/drivers/mmc/host/sh_mobile_sdhi.c index 4e2ac0e5e5d415..d044fed2736a15 100644 --- a/drivers/mmc/host/sh_mobile_sdhi.c +++ b/drivers/mmc/host/sh_mobile_sdhi.c @@ -32,6 +32,9 @@ #include #include #include +#include +#include +#include #include "tmio_mmc.h" @@ -97,6 +100,8 @@ 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) @@ -205,6 +210,49 @@ static void sh_mobile_sdhi_clk_disable(struct tmio_mmc_host *host) 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; + + 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 anything is missing, assume signal voltage is fixed at + * 3.3V and succeed/fail accordingly. + */ + if (IS_ERR(host->mmc->supply.vqmmc) || + IS_ERR(priv->pinctrl) || IS_ERR(state)) + return signal_voltage == MMC_SIGNAL_VOLTAGE_330 ? 0 : -EINVAL; + + 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; @@ -296,6 +344,14 @@ 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; @@ -319,6 +375,7 @@ static int sh_mobile_sdhi_probe(struct platform_device *pdev) host->clk_update = sh_mobile_sdhi_clk_update; 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; /* Orginally registers were 16 bit apart, could be 32 or 64 nowadays */ if (!host->bus_shift && resource_size(res) > 0x100) /* old way to determine the shift */