From patchwork Thu Oct 8 02:09:33 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Zulkifli, Muhammad Husaini" X-Patchwork-Id: 11822049 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 980B3109B for ; Thu, 8 Oct 2020 02:14:18 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 5BEFD207C3 for ; Thu, 8 Oct 2020 02:14:18 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="tKVJ9Iaz" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 5BEFD207C3 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=intel.com Authentication-Results: mail.kernel.org; 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07 Oct 2020 19:12:47 -0700 From: muhammad.husaini.zulkifli@intel.com To: adrian.hunter@intel.com, michal.simek@xilinx.com, andriy.shevchenko@intel.com, ulf.hansson@linaro.org, linux-mmc@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH v4 1/4] firmware: keembay: Add support for Arm Trusted Firmware Service call Date: Thu, 8 Oct 2020 10:09:33 +0800 Message-Id: <20201008020936.19894-2-muhammad.husaini.zulkifli@intel.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20201008020936.19894-1-muhammad.husaini.zulkifli@intel.com> References: <20201008020936.19894-1-muhammad.husaini.zulkifli@intel.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201007_221252_852333_BD6597E7 X-CRM114-Status: GOOD ( 17.78 ) X-Spam-Score: -2.3 (--) X-Spam-Report: SpamAssassin version 3.4.4 on merlin.infradead.org summary: Content analysis details: (-2.3 points) pts rule name description ---- ---------------------- -------------------------------------------------- -2.3 RCVD_IN_DNSWL_MED RBL: Sender listed at https://www.dnswl.org/, medium trust [134.134.136.20 listed in list.dnswl.org] 0.0 RCVD_IN_MSPIKE_H3 RBL: Good reputation (+3) [134.134.136.20 listed in wl.mailspike.net] -0.0 SPF_PASS SPF: sender matches SPF record 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record 0.0 RCVD_IN_MSPIKE_WL Mailspike good senders X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: lakshmi.bai.raja.subramanian@intel.com, muhammad.husaini.zulkifli@intel.com, arnd@arndb.de, wan.ahmad.zainie.wan.mohamad@intel.com MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org From: Muhammad Husaini Zulkifli Add header file to handle API function for device driver to communicate with Arm Trusted Firmware. Signed-off-by: Muhammad Husaini Zulkifli Acked-by: Michal Simek --- .../linux/firmware/intel/keembay_firmware.h | 47 +++++++++++++++++++ 1 file changed, 47 insertions(+) create mode 100644 include/linux/firmware/intel/keembay_firmware.h diff --git a/include/linux/firmware/intel/keembay_firmware.h b/include/linux/firmware/intel/keembay_firmware.h new file mode 100644 index 000000000000..8a62abcdfead --- /dev/null +++ b/include/linux/firmware/intel/keembay_firmware.h @@ -0,0 +1,47 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Intel Keembay SOC Firmware API Layer + * + * Copyright (C) 2020-2021, Intel Corporation + * + * Muhammad Husaini Zulkifli + */ + +#ifndef __FIRMWARE_KEEMBAY_SMC_H__ +#define __FIRMWARE_KEEMBAY_SMC_H__ + +#include + +/* + * This file defines API function that can be called by device driver in order to + * communicate with Arm Trusted Firmware. + */ + +/* Setting for Keem Bay IO Pad Line Voltage Selection */ +#define ARM_SMCCC_SIP_KEEMBAY_SET_SD_VOLTAGE \ + ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \ + ARM_SMCCC_SMC_32, \ + ARM_SMCCC_OWNER_SIP, \ + 0xFF26) + +#define KEEMBAY_SET_1V8_VOLT 1 +#define KEEMBAY_SET_3V3_VOLT 0 + +#if IS_ENABLED(CONFIG_HAVE_ARM_SMCCC_DISCOVERY) +static inline int keembay_sd_voltage_selection(int volt) +{ + struct arm_smccc_res res; + + arm_smccc_1_1_invoke(ARM_SMCCC_SIP_KEEMBAY_SET_SD_VOLTAGE, volt, &res); + if ((int)res.a0 < 0) + return -EINVAL; + + return 0; +} +#else +static inline int keembay_sd_voltage_selection(int volt) +{ + return -ENODEV; +} +#endif +#endif /* __FIRMWARE_KEEMBAY_SMC_H__ */ From patchwork Thu Oct 8 02:09:34 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Zulkifli, Muhammad Husaini" X-Patchwork-Id: 11822045 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 562D213B2 for ; Thu, 8 Oct 2020 02:13:15 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 1E606207C3 for ; Thu, 8 Oct 2020 02:13:15 +0000 (UTC) Authentication-Results: mail.kernel.org; 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d="scan'208";a="355211196" Received: from zulkifl3-ilbpg0.png.intel.com ([10.88.229.114]) by orsmga007.jf.intel.com with ESMTP; 07 Oct 2020 19:12:50 -0700 From: muhammad.husaini.zulkifli@intel.com To: adrian.hunter@intel.com, michal.simek@xilinx.com, andriy.shevchenko@intel.com, ulf.hansson@linaro.org, linux-mmc@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH v4 2/4] dt-bindings: mmc: Add uhs-gpio for Keem Bay UHS-1 Support Date: Thu, 8 Oct 2020 10:09:34 +0800 Message-Id: <20201008020936.19894-3-muhammad.husaini.zulkifli@intel.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20201008020936.19894-1-muhammad.husaini.zulkifli@intel.com> References: <20201008020936.19894-1-muhammad.husaini.zulkifli@intel.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201007_221254_298363_A4793095 X-CRM114-Status: GOOD ( 13.46 ) X-Spam-Score: -2.3 (--) X-Spam-Report: SpamAssassin version 3.4.4 on merlin.infradead.org summary: Content analysis details: (-2.3 points) pts rule name description ---- ---------------------- -------------------------------------------------- 0.0 RCVD_IN_MSPIKE_H3 RBL: Good reputation (+3) [134.134.136.20 listed in wl.mailspike.net] -2.3 RCVD_IN_DNSWL_MED RBL: Sender listed at https://www.dnswl.org/, medium trust [134.134.136.20 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record 0.0 RCVD_IN_MSPIKE_WL Mailspike good senders X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: lakshmi.bai.raja.subramanian@intel.com, muhammad.husaini.zulkifli@intel.com, arnd@arndb.de, wan.ahmad.zainie.wan.mohamad@intel.com MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org From: Muhammad Husaini Zulkifli Add DT bindings of uhs-gpio for Keem Bay SOC UHS Mode Support Signed-off-by: Muhammad Husaini Zulkifli Acked-by: Michal Simek --- Documentation/devicetree/bindings/mmc/arasan,sdhci.yaml | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/Documentation/devicetree/bindings/mmc/arasan,sdhci.yaml b/Documentation/devicetree/bindings/mmc/arasan,sdhci.yaml index 58fe9d02a781..320566a673f0 100644 --- a/Documentation/devicetree/bindings/mmc/arasan,sdhci.yaml +++ b/Documentation/devicetree/bindings/mmc/arasan,sdhci.yaml @@ -83,7 +83,7 @@ properties: - const: intel,keembay-sdhci-5.1-sd # Intel Keem Bay SD controller description: For this device it is strongly suggested to include - arasan,soc-ctl-syscon. + arasan,soc-ctl-syscon and uhs-gpio. - const: intel,keembay-sdhci-5.1-sdio # Intel Keem Bay SDIO controller description: For this device it is strongly suggested to include @@ -152,6 +152,11 @@ properties: description: The MIO bank number in which the command and data lines are configured. + uhs-gpio: + description: + The power mux input will be configure using the GPIO provided + to generate either 1.8v or 3.3v output. + dependencies: clock-output-names: [ '#clock-cells' ] '#clock-cells': [ clock-output-names ] @@ -300,4 +305,5 @@ examples: clocks = <&scmi_clk KEEM_BAY_PSS_AUX_SD0>, <&scmi_clk KEEM_BAY_PSS_SD0>; arasan,soc-ctl-syscon = <&sd0_phy_syscon>; + uhs-gpio = <&pca0 17 0>; }; From patchwork Thu Oct 8 02:09:35 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Zulkifli, Muhammad Husaini" X-Patchwork-Id: 11822051 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 5E9FA109B for ; Thu, 8 Oct 2020 02:14:28 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 2357A207C3 for ; Thu, 8 Oct 2020 02:14:28 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="DA1p615c" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2357A207C3 Authentication-Results: mail.kernel.org; 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d="scan'208";a="355211218" Received: from zulkifl3-ilbpg0.png.intel.com ([10.88.229.114]) by orsmga007.jf.intel.com with ESMTP; 07 Oct 2020 19:12:53 -0700 From: muhammad.husaini.zulkifli@intel.com To: adrian.hunter@intel.com, michal.simek@xilinx.com, andriy.shevchenko@intel.com, ulf.hansson@linaro.org, linux-mmc@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH v4 3/4] mmc: sdhci-of-arasan: Add structure device pointer in probe Date: Thu, 8 Oct 2020 10:09:35 +0800 Message-Id: <20201008020936.19894-4-muhammad.husaini.zulkifli@intel.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20201008020936.19894-1-muhammad.husaini.zulkifli@intel.com> References: <20201008020936.19894-1-muhammad.husaini.zulkifli@intel.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201007_221256_869423_1F64A615 X-CRM114-Status: GOOD ( 13.43 ) X-Spam-Score: -2.3 (--) X-Spam-Report: SpamAssassin version 3.4.4 on merlin.infradead.org summary: Content analysis details: (-2.3 points) pts rule name description ---- ---------------------- -------------------------------------------------- 0.0 RCVD_IN_MSPIKE_H3 RBL: Good reputation (+3) [134.134.136.20 listed in wl.mailspike.net] -2.3 RCVD_IN_DNSWL_MED RBL: Sender listed at https://www.dnswl.org/, medium trust [134.134.136.20 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record 0.0 RCVD_IN_MSPIKE_WL Mailspike good senders X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: lakshmi.bai.raja.subramanian@intel.com, muhammad.husaini.zulkifli@intel.com, arnd@arndb.de, wan.ahmad.zainie.wan.mohamad@intel.com MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org From: Muhammad Husaini Zulkifli Add struct device *dev in probe func() so that it can widely use in probe to make code more readable. Signed-off-by: Muhammad Husaini Zulkifli --- drivers/mmc/host/sdhci-of-arasan.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/mmc/host/sdhci-of-arasan.c b/drivers/mmc/host/sdhci-of-arasan.c index f186fbd016b1..46aea6516133 100644 --- a/drivers/mmc/host/sdhci-of-arasan.c +++ b/drivers/mmc/host/sdhci-of-arasan.c @@ -1521,6 +1521,7 @@ static int sdhci_arasan_probe(struct platform_device *pdev) struct sdhci_pltfm_host *pltfm_host; struct sdhci_arasan_data *sdhci_arasan; struct device_node *np = pdev->dev.of_node; + struct device *dev = &pdev->dev; const struct sdhci_arasan_of_data *data; match = of_match_node(sdhci_arasan_of_match, pdev->dev.of_node); From patchwork Thu Oct 8 02:09:36 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Zulkifli, Muhammad Husaini" X-Patchwork-Id: 11822047 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 007D613B2 for ; 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d="scan'208";a="152154731" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga007.jf.intel.com ([10.7.209.58]) by orsmga101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 Oct 2020 19:12:59 -0700 IronPort-SDR: gIWl9Y8g5C5DaHgq5cgaqniAKlfQoeYj4GtL2AFjCaz+7Owr2fKVl7SIFPp81lIW2iSw5w7m6F SHaMjBDQf5rw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.77,349,1596524400"; d="scan'208";a="355211247" Received: from zulkifl3-ilbpg0.png.intel.com ([10.88.229.114]) by orsmga007.jf.intel.com with ESMTP; 07 Oct 2020 19:12:56 -0700 From: muhammad.husaini.zulkifli@intel.com To: adrian.hunter@intel.com, michal.simek@xilinx.com, andriy.shevchenko@intel.com, ulf.hansson@linaro.org, linux-mmc@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH v4 4/4] mmc: sdhci-of-arasan: Enable UHS-1 support for Keem Bay SOC Date: Thu, 8 Oct 2020 10:09:36 +0800 Message-Id: <20201008020936.19894-5-muhammad.husaini.zulkifli@intel.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20201008020936.19894-1-muhammad.husaini.zulkifli@intel.com> References: <20201008020936.19894-1-muhammad.husaini.zulkifli@intel.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201007_221300_058074_2C7BE10E X-CRM114-Status: GOOD ( 21.00 ) X-Spam-Score: -2.3 (--) X-Spam-Report: SpamAssassin version 3.4.4 on merlin.infradead.org summary: Content analysis details: (-2.3 points) pts rule name description ---- ---------------------- -------------------------------------------------- 0.0 RCVD_IN_MSPIKE_H3 RBL: Good reputation (+3) [134.134.136.20 listed in wl.mailspike.net] -2.3 RCVD_IN_DNSWL_MED RBL: Sender listed at https://www.dnswl.org/, medium trust [134.134.136.20 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record 0.0 RCVD_IN_MSPIKE_WL Mailspike good senders X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: lakshmi.bai.raja.subramanian@intel.com, muhammad.husaini.zulkifli@intel.com, arnd@arndb.de, wan.ahmad.zainie.wan.mohamad@intel.com MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org From: Muhammad Husaini Zulkifli Voltage switching sequence is needed to support UHS-1 interface. There are 2 places to control the voltage. 1) By setting the AON register using firmware driver calling system-level platform management layer (SMC) to set the register. 2) By controlling the GPIO expander value to drive either 1.8V or 3.3V for power mux input. Signed-off-by: Muhammad Husaini Zulkifli Reviewed-by: Andy Shevchenko Reviewed-by: Adrian Hunter Acked-by: Michal Simek --- drivers/mmc/host/sdhci-of-arasan.c | 126 +++++++++++++++++++++++++++++ 1 file changed, 126 insertions(+) diff --git a/drivers/mmc/host/sdhci-of-arasan.c b/drivers/mmc/host/sdhci-of-arasan.c index 46aea6516133..ea2467b0073d 100644 --- a/drivers/mmc/host/sdhci-of-arasan.c +++ b/drivers/mmc/host/sdhci-of-arasan.c @@ -16,6 +16,7 @@ */ #include +#include #include #include #include @@ -23,6 +24,7 @@ #include #include #include +#include #include "cqhci.h" #include "sdhci-pltfm.h" @@ -136,6 +138,7 @@ struct sdhci_arasan_clk_data { * @soc_ctl_base: Pointer to regmap for syscon for soc_ctl registers. * @soc_ctl_map: Map to get offsets into soc_ctl registers. * @quirks: Arasan deviations from spec. + * @uhs_gpio: Pointer to the uhs gpio. */ struct sdhci_arasan_data { struct sdhci_host *host; @@ -150,6 +153,7 @@ struct sdhci_arasan_data { struct regmap *soc_ctl_base; const struct sdhci_arasan_soc_ctl_map *soc_ctl_map; unsigned int quirks; + struct gpio_desc *uhs_gpio; /* Controller does not have CD wired and will not function normally without */ #define SDHCI_ARASAN_QUIRK_FORCE_CDTEST BIT(0) @@ -361,6 +365,112 @@ static int sdhci_arasan_voltage_switch(struct mmc_host *mmc, return -EINVAL; } +static int sdhci_arasan_keembay_voltage_switch(struct mmc_host *mmc, + struct mmc_ios *ios) +{ + struct sdhci_host *host = mmc_priv(mmc); + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); + struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host); + u16 ctrl_2, clk; + int ret; + + switch (ios->signal_voltage) { + case MMC_SIGNAL_VOLTAGE_180: + clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL); + clk &= ~SDHCI_CLOCK_CARD_EN; + sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL); + + clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL); + if (clk & SDHCI_CLOCK_CARD_EN) + return -EAGAIN; + + sdhci_writeb(host, SDHCI_POWER_ON | SDHCI_POWER_180, + SDHCI_POWER_CONTROL); + + /* + * Set VDDIO_B voltage to Low for 1.8V + * which is controlling by GPIO Expander. + */ + gpiod_set_value_cansleep(sdhci_arasan->uhs_gpio, 0); + + /* + * This is like a final gatekeeper. Need to ensure changed voltage + * is settled before and after turn on this bit. + */ + usleep_range(1000, 1100); + + ret = keembay_sd_voltage_selection(KEEMBAY_SET_1V8_VOLT); + if (ret) + return ret; + + usleep_range(1000, 1100); + + ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2); + ctrl_2 |= SDHCI_CTRL_VDD_180; + sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2); + + /* Sleep for 5ms to stabilize 1.8V regulator */ + usleep_range(5000, 5500); + + /* 1.8V regulator output should be stable within 5 ms */ + ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2); + if (!(ctrl_2 & SDHCI_CTRL_VDD_180)) + return -EAGAIN; + + clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL); + clk |= SDHCI_CLOCK_CARD_EN; + sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL); + break; + case MMC_SIGNAL_VOLTAGE_330: + /* + * Set VDDIO_B voltage to High for 3.3V + * which is controlling by GPIO Expander. + */ + gpiod_set_value_cansleep(sdhci_arasan->uhs_gpio, 1); + + /* + * This is like a final gatekeeper. Need to ensure changed voltage + * is settled before and after turn on this bit. + */ + usleep_range(1000, 1100); + + ret = keembay_sd_voltage_selection(KEEMBAY_SET_3V3_VOLT); + if (ret) + return ret; + + usleep_range(1000, 1100); + + /* Set 1.8V Signal Enable in the Host Control2 register to 0 */ + ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2); + ctrl_2 &= ~SDHCI_CTRL_VDD_180; + sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2); + + /* Sleep for 5ms to stabilize 3.3V regulator */ + usleep_range(5000, 5500); + + /* 3.3V regulator output should be stable within 5 ms */ + ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2); + if (ctrl_2 & SDHCI_CTRL_VDD_180) + return -EAGAIN; + + break; + default: + return -EINVAL; + } + + return 0; +} + +static int sdhci_arasan_keembay_select_drive_strength(struct mmc_card *card, + unsigned int max_dtr, int host_drv, + int card_drv, int *drv_type) +{ + if (card->host->ios.signal_voltage == MMC_SIGNAL_VOLTAGE_180) + *drv_type = MMC_SET_DRIVER_TYPE_C; + + return 0; +} + static const struct sdhci_ops sdhci_arasan_ops = { .set_clock = sdhci_arasan_set_clock, .get_max_clock = sdhci_pltfm_clk_get_max_clock, @@ -1601,6 +1711,22 @@ static int sdhci_arasan_probe(struct platform_device *pdev) host->mmc->caps |= MMC_CAP_WAIT_WHILE_BUSY; } + if (of_device_is_compatible(np, "intel,keembay-sdhci-5.1-sd")) { + struct gpio_desc *uhs; + + uhs = devm_gpiod_get_optional(dev, "uhs", GPIOD_OUT_HIGH); + if (IS_ERR(uhs)) + return dev_err_probe(dev, PTR_ERR(uhs), "can't get uhs gpio\n"); + + sdhci_arasan->uhs_gpio = uhs; + + host->mmc_host_ops.start_signal_voltage_switch = + sdhci_arasan_keembay_voltage_switch; + + host->mmc_host_ops.select_drive_strength = + sdhci_arasan_keembay_select_drive_strength; + } + sdhci_arasan_update_baseclkfreq(host); ret = sdhci_arasan_register_sdclk(sdhci_arasan, clk_xin, &pdev->dev);