From patchwork Wed Jan 11 17:19:11 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Gregory CLEMENT X-Patchwork-Id: 9510715 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 71AD060762 for ; Wed, 11 Jan 2017 17:22:12 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 79E6228609 for ; Wed, 11 Jan 2017 17:22:12 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 6E6A028630; Wed, 11 Jan 2017 17:22:12 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id DC6C428626 for ; Wed, 11 Jan 2017 17:22:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1030785AbdAKRVi (ORCPT ); Wed, 11 Jan 2017 12:21:38 -0500 Received: from mail.free-electrons.com ([62.4.15.54]:56241 "EHLO mail.free-electrons.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1760610AbdAKRVL (ORCPT ); Wed, 11 Jan 2017 12:21:11 -0500 Received: by mail.free-electrons.com (Postfix, from userid 110) id 1140C207D2; Wed, 11 Jan 2017 18:20:15 +0100 (CET) Received: from localhost (83.146.29.93.rev.sfr.net [93.29.146.83]) by mail.free-electrons.com (Postfix) with ESMTPSA id C8148203FA; Wed, 11 Jan 2017 18:20:14 +0100 (CET) From: Gregory CLEMENT To: Ulf Hansson , Adrian Hunter , linux-mmc@vger.kernel.org Cc: Jason Cooper , Andrew Lunn , Sebastian Hesselbarth , Gregory CLEMENT , Thomas Petazzoni , linux-arm-kernel@lists.infradead.org, Mike Turquette , Stephen Boyd , linux-clk@vger.kernel.org, linux-kernel@vger.kernel.org, Rob Herring , devicetree@vger.kernel.org, Ziji Hu , Jimmy Xu , Jisheng Zhang , Nadav Haklai , Ryan Gao , Doug Jones , Victor Gu , "Wei(SOCP) Liu" , Wilson Ding , Yehuda Yitschak , Marcin Wojtas , Hanna Hawa , Kostya Porotchkin Subject: [PATCH v5 08/12] mmc: sdhci-xenon: Add SoC PHY PAD voltage control Date: Wed, 11 Jan 2017 18:19:11 +0100 Message-Id: <09eb14b06f2745c155202b694289c22b495809fb.1484154449.git-series.gregory.clement@free-electrons.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: References: In-Reply-To: References: Sender: linux-mmc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mmc@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Hu Ziji Some SoCs have PHY PAD outside Xenon IP. PHY PAD voltage should match signalling voltage in use. Add generic SoC PHY PAD voltage control interface. Implement Aramda-3700 SoC PHY PAD voltage control. Signed-off-by: Hu Ziji Tested-by: Russell King Signed-off-by: Gregory CLEMENT --- drivers/mmc/host/sdhci-xenon-phy.c | 116 +++++++++++++++++++++++++++++- drivers/mmc/host/sdhci-xenon.c | 2 +- drivers/mmc/host/sdhci-xenon.h | 2 +- 3 files changed, 119 insertions(+), 1 deletion(-) diff --git a/drivers/mmc/host/sdhci-xenon-phy.c b/drivers/mmc/host/sdhci-xenon-phy.c index f410712d24ea..1221754b7a3d 100644 --- a/drivers/mmc/host/sdhci-xenon-phy.c +++ b/drivers/mmc/host/sdhci-xenon-phy.c @@ -143,6 +143,27 @@ enum phy_type_enum { NR_PHY_TYPES }; +enum soc_pad_ctrl_type { + SOC_PAD_SD, + SOC_PAD_FIXED_1_8V, +}; + +struct soc_pad_ctrl_table { + const char *soc; + void (*set_soc_pad)(struct sdhci_host *host, + unsigned char signal_voltage); +}; + +struct soc_pad_ctrl { + /* Register address of SOC PHY PAD ctrl */ + void __iomem *reg; + /* SOC PHY PAD ctrl type */ + enum soc_pad_ctrl_type pad_type; + /* SOC specific operation to set SOC PHY PAD */ + void (*set_soc_pad)(struct sdhci_host *host, + unsigned char signal_voltage); +}; + static struct xenon_emmc_phy_regs xenon_emmc_5_0_phy_regs = { .timing_adj = XENON_EMMC_5_0_PHY_TIMING_ADJUST, .func_ctrl = XENON_EMMC_5_0_PHY_FUNC_CONTROL, @@ -176,6 +197,8 @@ struct emmc_phy_params { u8 nr_tun_times; /* Divider for calculating Tuning Step */ u8 tun_step_divider; + + struct soc_pad_ctrl pad_ctrl; }; static int alloc_emmc_phy(struct sdhci_xenon_priv *priv) @@ -252,6 +275,45 @@ static int emmc_phy_init(struct sdhci_host *host) return 0; } +#define ARMADA_3700_SOC_PAD_1_8V 0x1 +#define ARMADA_3700_SOC_PAD_3_3V 0x0 + +static void armada_3700_soc_pad_voltage_set(struct sdhci_host *host, + unsigned char signal_voltage) +{ + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); + struct sdhci_xenon_priv *priv = sdhci_pltfm_priv(pltfm_host); + struct emmc_phy_params *params = priv->phy_params; + + if (params->pad_ctrl.pad_type == SOC_PAD_FIXED_1_8V) { + writel(ARMADA_3700_SOC_PAD_1_8V, params->pad_ctrl.reg); + } else if (params->pad_ctrl.pad_type == SOC_PAD_SD) { + if (signal_voltage == MMC_SIGNAL_VOLTAGE_180) + writel(ARMADA_3700_SOC_PAD_1_8V, params->pad_ctrl.reg); + else if (signal_voltage == MMC_SIGNAL_VOLTAGE_330) + writel(ARMADA_3700_SOC_PAD_3_3V, params->pad_ctrl.reg); + } +} + +/* + * Set SOC PHY voltage PAD control register, + * according to the operation voltage on PAD. + * The detailed operation depends on SOC implementaion. + */ +static void emmc_phy_set_soc_pad(struct sdhci_host *host, + unsigned char signal_voltage) +{ + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); + struct sdhci_xenon_priv *priv = sdhci_pltfm_priv(pltfm_host); + struct emmc_phy_params *params = priv->phy_params; + + if (!params->pad_ctrl.reg) + return; + + if (params->pad_ctrl.set_soc_pad) + params->pad_ctrl.set_soc_pad(host, signal_voltage); +} + /* * Enable eMMC PHY HW DLL * DLL should be enabled and stable before HS200/SDR104 tuning, @@ -621,6 +683,51 @@ static void emmc_phy_set(struct sdhci_host *host, dev_dbg(mmc_dev(host->mmc), "eMMC PHY setting completes\n"); } +static int get_dt_pad_ctrl_data(struct sdhci_host *host, + struct device_node *np, + struct emmc_phy_params *params) +{ + int ret = 0; + const char *name; + struct resource iomem; + + if (of_device_is_compatible(np, "marvell,armada-3700-sdhci")) + params->pad_ctrl.set_soc_pad = armada_3700_soc_pad_voltage_set; + else + return 0; + + if (of_address_to_resource(np, 1, &iomem)) { + dev_err(mmc_dev(host->mmc), "Unable to find SOC PAD ctrl register address for %s\n", + np->name); + return -EINVAL; + } + + params->pad_ctrl.reg = devm_ioremap_resource(mmc_dev(host->mmc), + &iomem); + if (IS_ERR(params->pad_ctrl.reg)) { + dev_err(mmc_dev(host->mmc), "Unable to get SOC PHY PAD ctrl regiser for %s\n", + np->name); + return PTR_ERR(params->pad_ctrl.reg); + } + + ret = of_property_read_string(np, "marvell,pad-type", &name); + if (ret) { + dev_err(mmc_dev(host->mmc), "Unable to determine SOC PHY PAD ctrl type\n"); + return ret; + } + if (!strcmp(name, "sd")) { + params->pad_ctrl.pad_type = SOC_PAD_SD; + } else if (!strcmp(name, "fixed-1-8v")) { + params->pad_ctrl.pad_type = SOC_PAD_FIXED_1_8V; + } else { + dev_err(mmc_dev(host->mmc), "Unsupported SOC PHY PAD ctrl type %s\n", + name); + return -EINVAL; + } + + return ret; +} + static int emmc_phy_parse_param_dt(struct sdhci_host *host, struct device_node *np, struct emmc_phy_params *params) @@ -654,7 +761,14 @@ static int emmc_phy_parse_param_dt(struct sdhci_host *host, else params->tun_step_divider = XENON_TUNING_STEP_DIVIDER; - return 0; + return get_dt_pad_ctrl_data(host, np, params); +} + +/* Set SOC PHY Voltage PAD */ +void xenon_soc_pad_ctrl(struct sdhci_host *host, + unsigned char signal_voltage) +{ + emmc_phy_set_soc_pad(host, signal_voltage); } /* diff --git a/drivers/mmc/host/sdhci-xenon.c b/drivers/mmc/host/sdhci-xenon.c index e51079b2d01c..be93af56c348 100644 --- a/drivers/mmc/host/sdhci-xenon.c +++ b/drivers/mmc/host/sdhci-xenon.c @@ -335,6 +335,8 @@ static int xenon_start_signal_voltage_switch(struct mmc_host *mmc, */ enable_xenon_internal_clk(host); + xenon_soc_pad_ctrl(host, ios->signal_voltage); + if (priv->init_card_type == MMC_TYPE_MMC) return xenon_emmc_signal_voltage_switch(mmc, ios); diff --git a/drivers/mmc/host/sdhci-xenon.h b/drivers/mmc/host/sdhci-xenon.h index e87639774bca..57e7cb463413 100644 --- a/drivers/mmc/host/sdhci-xenon.h +++ b/drivers/mmc/host/sdhci-xenon.h @@ -104,4 +104,6 @@ struct sdhci_xenon_priv { int xenon_phy_adj(struct sdhci_host *host, struct mmc_ios *ios); int xenon_phy_parse_dt(struct device_node *np, struct sdhci_host *host); +void xenon_soc_pad_ctrl(struct sdhci_host *host, + unsigned char signal_voltage); #endif