From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ben Hutchings Subject: [PATCH v2 4/6] mmc: sh_mobile_sdhi: Add UHS-I mode support Date: Wed, 10 Jun 2015 00:23:48 +0100 Message-ID: <1433892228.12074.53.camel@codethink.co.uk> References: <1433892104.12074.49.camel@codethink.co.uk> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Return-path: Received: from ducie-dc1.codethink.co.uk ([185.25.241.215]:34375 "EHLO ducie-dc1.codethink.co.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753434AbbFIXXz (ORCPT ); Tue, 9 Jun 2015 19:23:55 -0400 In-Reply-To: <1433892104.12074.49.camel@codethink.co.uk> Sender: linux-gpio-owner@vger.kernel.org List-Id: linux-gpio@vger.kernel.org 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 , Kuninori Morimoto 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 | 60 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 60 insertions(+) diff --git a/drivers/mmc/host/sh_mobile_sdhi.c b/drivers/mmc/host/sh_mobile_sdhi.c index 354f4f335ed5..2e65b855a7f7 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 +141,49 @@ 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; + + 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; @@ -228,6 +276,14 @@ 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 +295,10 @@ 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; -- 2.1.4