From patchwork Tue Jan 28 09:06:33 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ludovic BARRE X-Patchwork-Id: 211232 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 04544C35246 for ; Tue, 28 Jan 2020 09:07:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C58892467E for ; Tue, 28 Jan 2020 09:07:15 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=st.com header.i=@st.com header.b="e9PL7h5J" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726254AbgA1JHE (ORCPT ); Tue, 28 Jan 2020 04:07:04 -0500 Received: from mx08-00178001.pphosted.com ([91.207.212.93]:6246 "EHLO mx07-00178001.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726182AbgA1JHE (ORCPT ); Tue, 28 Jan 2020 04:07:04 -0500 Received: from pps.filterd (m0046660.ppops.net [127.0.0.1]) by mx07-00178001.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id 00S93bqr014416; Tue, 28 Jan 2020 10:06:52 +0100 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=st.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-type; s=STMicroelectronics; bh=KcQ1VJ9VyVuhQMCM59rAixh8H5s1dcn6fTo0KkBt7w0=; b=e9PL7h5Jm8zg/uktPwq+PrMYe2OPWSTqgiu0PbBPj4TYYdYwUWTRj7j19HPgDxDe1NCS CerYjaT5NsFcenMaj9Zwue9oPpgHwvsg9MYrVvEPUIPhhMtVDsR3VXA8d8AnM2/a1tSW wOBeAAg1Xtl73RP/mNqxnk5rBYZ+1f5634SJlGOPqfEO9ku/9CPtfb/qL7cHC5xmdMgH oX8HlfncNNrwJjMtoeKlfENVvSzgAMewBWzDU7gbmBZ3bjdEZ02mo4Xu0m92AHDviUBD 6c/OGonvQpiyLWo1GzmhhuY4c+S4kl6MxBoi8tRLN371mfKPoO0Nn5v3RUA/iwvRgwok Dg== Received: from beta.dmz-eu.st.com (beta.dmz-eu.st.com [164.129.1.35]) by mx07-00178001.pphosted.com with ESMTP id 2xrbpaw4td-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 28 Jan 2020 10:06:52 +0100 Received: from euls16034.sgp.st.com (euls16034.sgp.st.com [10.75.44.20]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id DAECB100034; Tue, 28 Jan 2020 10:06:45 +0100 (CET) Received: from Webmail-eu.st.com (sfhdag6node1.st.com [10.75.127.16]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id CD84E212A35; Tue, 28 Jan 2020 10:06:45 +0100 (CET) Received: from localhost (10.75.127.45) by SFHDAG6NODE1.st.com (10.75.127.16) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Tue, 28 Jan 2020 10:06:45 +0100 From: Ludovic Barre To: Ulf Hansson , Rob Herring CC: , Maxime Coquelin , Alexandre Torgue , , , , , , Ludovic Barre Subject: [PATCH V2 6/9] mmc: mmci: sdmmc: add execute tuning with delay block Date: Tue, 28 Jan 2020 10:06:33 +0100 Message-ID: <20200128090636.13689-7-ludovic.barre@st.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200128090636.13689-1-ludovic.barre@st.com> References: <20200128090636.13689-1-ludovic.barre@st.com> MIME-Version: 1.0 X-Originating-IP: [10.75.127.45] X-ClientProxiedBy: SFHDAG3NODE3.st.com (10.75.127.9) To SFHDAG6NODE1.st.com (10.75.127.16) X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.138, 18.0.572 definitions=2020-01-28_02:2020-01-24,2020-01-28 signatures=0 Sender: linux-mmc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mmc@vger.kernel.org The hardware delay block is used to align the sampling clock on the data received by SDMMC. It is mandatory for SDMMC to support the SDR104 mode. The delay block is used to generate an output clock which is dephased from the input clock. The phase of the output clock must be programmed by the execute tuning interface. Signed-off-by: Ludovic Barre --- drivers/mmc/host/mmci_stm32_sdmmc.c | 149 ++++++++++++++++++++++++++++ 1 file changed, 149 insertions(+) diff --git a/drivers/mmc/host/mmci_stm32_sdmmc.c b/drivers/mmc/host/mmci_stm32_sdmmc.c index df08f6662431..fa875febcc85 100644 --- a/drivers/mmc/host/mmci_stm32_sdmmc.c +++ b/drivers/mmc/host/mmci_stm32_sdmmc.c @@ -3,10 +3,13 @@ * Copyright (C) STMicroelectronics 2018 - All Rights Reserved * Author: Ludovic.barre@st.com for STMicroelectronics. */ +#include #include #include +#include #include #include +#include #include #include #include "mmci.h" @@ -14,6 +17,22 @@ #define SDMMC_LLI_BUF_LEN PAGE_SIZE #define SDMMC_IDMA_BURST BIT(MMCI_STM32_IDMABNDT_SHIFT) +#define DLYB_CR 0x0 +#define DLYB_CR_DEN BIT(0) +#define DLYB_CR_SEN BIT(1) + +#define DLYB_CFGR 0x4 +#define DLYB_CFGR_SEL_MASK GENMASK(3, 0) +#define DLYB_CFGR_UNIT_MASK GENMASK(14, 8) +#define DLYB_CFGR_LNG_MASK GENMASK(27, 16) +#define DLYB_CFGR_LNGF BIT(31) + +#define DLYB_NB_DELAY 11 +#define DLYB_CFGR_SEL_MAX (DLYB_NB_DELAY + 1) +#define DLYB_CFGR_UNIT_MAX 127 + +#define DLYB_LNG_TIMEOUT_US 1000 + struct sdmmc_lli_desc { u32 idmalar; u32 idmabase; @@ -25,6 +44,12 @@ struct sdmmc_idma { void *sg_cpu; }; +struct sdmmc_dlyb { + void __iomem *base; + u32 unit; + u32 max; +}; + static int sdmmc_idma_validate_data(struct mmci_host *host, struct mmc_data *data) { @@ -226,12 +251,24 @@ static void mmci_sdmmc_set_clkreg(struct mmci_host *host, unsigned int desired) mmci_write_clkreg(host, clk); } +static void sdmmc_dlyb_input_ck(struct sdmmc_dlyb *dlyb) +{ + if (!dlyb || !dlyb->base) + return; + + /* Output clock = Input clock */ + writel_relaxed(0, dlyb->base + DLYB_CR); +} + static void mmci_sdmmc_set_pwrreg(struct mmci_host *host, unsigned int pwr) { struct mmc_ios ios = host->mmc->ios; + struct sdmmc_dlyb *dlyb = host->variant_priv; pwr = host->pwr_reg_add; + sdmmc_dlyb_input_ck(dlyb); + if (ios.power_mode == MMC_POWER_OFF) { /* Only a reset could power-off sdmmc */ reset_control_assert(host->rst); @@ -323,6 +360,102 @@ static bool sdmmc_busy_complete(struct mmci_host *host, u32 status, u32 err_msk) return true; } +static void sdmmc_dlyb_set_cfgr(struct sdmmc_dlyb *dlyb, + int unit, int phase, bool sampler) +{ + u32 cfgr; + + writel_relaxed(DLYB_CR_SEN | DLYB_CR_DEN, dlyb->base + DLYB_CR); + + cfgr = FIELD_PREP(DLYB_CFGR_UNIT_MASK, unit) | + FIELD_PREP(DLYB_CFGR_SEL_MASK, phase); + writel_relaxed(cfgr, dlyb->base + DLYB_CFGR); + + if (!sampler) + writel_relaxed(DLYB_CR_DEN, dlyb->base + DLYB_CR); +} + +static int sdmmc_dlyb_lng_tuning(struct mmci_host *host) +{ + struct sdmmc_dlyb *dlyb = host->variant_priv; + u32 cfgr; + int i, lng, ret; + + for (i = 0; i <= DLYB_CFGR_UNIT_MAX; i++) { + sdmmc_dlyb_set_cfgr(dlyb, i, DLYB_CFGR_SEL_MAX, true); + + ret = readl_relaxed_poll_timeout(dlyb->base + DLYB_CFGR, cfgr, + (cfgr & DLYB_CFGR_LNGF), + 1, DLYB_LNG_TIMEOUT_US); + if (ret) { + dev_warn(mmc_dev(host->mmc), + "delay line cfg timeout unit:%d cfgr:%d\n", + i, cfgr); + continue; + } + + lng = FIELD_GET(DLYB_CFGR_LNG_MASK, cfgr); + if (lng < BIT(DLYB_NB_DELAY) && lng > 0) + break; + } + + if (i > DLYB_CFGR_UNIT_MAX) + return -EINVAL; + + dlyb->unit = i; + dlyb->max = __fls(lng); + + return 0; +} + +static int sdmmc_dlyb_phase_tuning(struct mmci_host *host, u32 opcode) +{ + struct sdmmc_dlyb *dlyb = host->variant_priv; + int cur_len = 0, max_len = 0, end_of_len = 0; + int phase; + + for (phase = 0; phase <= dlyb->max; phase++) { + sdmmc_dlyb_set_cfgr(dlyb, dlyb->unit, phase, false); + + if (mmc_send_tuning(host->mmc, opcode, NULL)) { + cur_len = 0; + } else { + cur_len++; + if (cur_len > max_len) { + max_len = cur_len; + end_of_len = phase; + } + } + } + + if (!max_len) { + dev_err(mmc_dev(host->mmc), "no tuning point found\n"); + return -EINVAL; + } + + phase = end_of_len - max_len / 2; + sdmmc_dlyb_set_cfgr(dlyb, dlyb->unit, phase, false); + + dev_dbg(mmc_dev(host->mmc), "unit:%d max_dly:%d phase:%d\n", + dlyb->unit, dlyb->max, phase); + + return 0; +} + +static int sdmmc_execute_tuning(struct mmc_host *mmc, u32 opcode) +{ + struct mmci_host *host = mmc_priv(mmc); + struct sdmmc_dlyb *dlyb = host->variant_priv; + + if (!dlyb || !dlyb->base) + return -EINVAL; + + if (sdmmc_dlyb_lng_tuning(host)) + return -EINVAL; + + return sdmmc_dlyb_phase_tuning(host, opcode); +} + static struct mmci_host_ops sdmmc_variant_ops = { .validate_data = sdmmc_idma_validate_data, .prep_data = sdmmc_idma_prep_data, @@ -338,5 +471,21 @@ static struct mmci_host_ops sdmmc_variant_ops = { void sdmmc_variant_init(struct mmci_host *host) { + struct device_node *np = host->mmc->parent->of_node; + void __iomem *base_dlyb; + struct sdmmc_dlyb *dlyb; + host->ops = &sdmmc_variant_ops; + + base_dlyb = devm_of_iomap(mmc_dev(host->mmc), np, 1, NULL); + if (IS_ERR(base_dlyb)) + return; + + dlyb = devm_kzalloc(mmc_dev(host->mmc), sizeof(*dlyb), GFP_KERNEL); + if (!dlyb) + return; + + dlyb->base = base_dlyb; + host->variant_priv = dlyb; + host->mmc_ops->execute_tuning = sdmmc_execute_tuning; }