From patchwork Tue Aug 25 08:13:56 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lars Povlsen X-Patchwork-Id: 11735103 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 45649138A for ; Tue, 25 Aug 2020 08:14:20 +0000 (UTC) Received: by mail.kernel.org (Postfix) id 4082820706; Tue, 25 Aug 2020 08:14:20 +0000 (UTC) Delivered-To: soc@kernel.org Received: from esa6.microchip.iphmx.com (esa6.microchip.iphmx.com [216.71.154.253]) (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 0081D2065F for ; Tue, 25 Aug 2020 08:14:19 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=microchip.com header.i=@microchip.com header.b="EcUxzVUw" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 0081D2065F Authentication-Results: mail.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=microchip.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=Lars.Povlsen@microchip.com DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=microchip.com; i=@microchip.com; q=dns/txt; s=mchp; t=1598343260; x=1629879260; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=zkvsjFjop1+FJ6vnrQVQRzwFGDsPAxJYj9IAhFfXR2M=; b=EcUxzVUwCGO2e60hJYC0ITd1X6apakyH1vInFDZLMQlbVJ7lcSrvlvpw ykWSxuDbbKcfm4lW5vV9AM+8a6a7LIw5wuPHz02Etl7uP7GT0BmHQn+3S EnDZfiniZIAICMXIB5mJ5y3f4KW5Xryu6u2OZJv0IKgyna+90rs40n+C1 MJvAPuqtr6Sk+D0GXpf+d1Ftlli0bHj6bKLDKUIBVoUplM7VCxhp/pk9l mW+8ttJ1k2gV9jv0fAR7PXoatRK9ol0YBur7zbE+nhAZ7nckzVo5pVdEv xzNPfpkumyMO7Btf1GepPYpWcDa+pIgbUKfGW5sDz+hyuRtPq19Lmvo2/ A==; IronPort-SDR: Y+Kbh6CEKldjYV0VyLuu8vitrX3zSXQGEoHH/6gpEJDjTqW0gBDazZdIDsys4ZvHkjv/zZ6MT3 W6J62Bzk/cuobabQKYkQixvs8bkznB6mASmoYr0pG/K6L5HTHUsGmKscszRMH55hAE43bLBUH/ Uxe3+w8NajBzWnSxA3RMJUnMUkrOySFSTfHwm5z5CBMAPT/cN/CrHEKQukc5Utc2w9GSRDv3bY 5IIGu/o63FJikOsDchEy1GoWPddL5ItM0Mtso0rJhsOYNVclHDBjHqYmxDplqvUeJWrSPWiFM6 jsA= X-IronPort-AV: E=Sophos;i="5.76,351,1592895600"; d="scan'208";a="24141077" Received: from smtpout.microchip.com (HELO email.microchip.com) ([198.175.253.82]) by esa6.microchip.iphmx.com with ESMTP/TLS/AES256-SHA256; 25 Aug 2020 01:14:19 -0700 Received: from chn-vm-ex02.mchp-main.com (10.10.87.72) by chn-vm-ex02.mchp-main.com (10.10.87.72) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1979.3; Tue, 25 Aug 2020 01:13:38 -0700 Received: from soft-dev15.microsemi.net (10.10.115.15) by chn-vm-ex02.mchp-main.com (10.10.85.144) with Microsoft SMTP Server id 15.1.1979.3 via Frontend Transport; Tue, 25 Aug 2020 01:13:36 -0700 From: Lars Povlsen List-Id: To: Ulf Hansson , Adrian Hunter , SoC Team CC: Lars Povlsen , Microchip Linux Driver Support , , , , , Alexandre Belloni Subject: [PATCH v5 2/3] sdhci: sparx5: Add Sparx5 SoC eMMC driver Date: Tue, 25 Aug 2020 10:13:56 +0200 Message-ID: <20200825081357.32354-3-lars.povlsen@microchip.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20200825081357.32354-1-lars.povlsen@microchip.com> References: <20200825081357.32354-1-lars.povlsen@microchip.com> MIME-Version: 1.0 This adds the eMMC driver for the Sparx5 SoC. It is based upon the designware IP, but requires some extra initialization and quirks. Signed-off-by: Lars Povlsen Acked-by: Adrian Hunter --- drivers/mmc/host/Kconfig | 12 ++ drivers/mmc/host/Makefile | 1 + drivers/mmc/host/sdhci-of-sparx5.c | 269 +++++++++++++++++++++++++++++ 3 files changed, 282 insertions(+) create mode 100644 drivers/mmc/host/sdhci-of-sparx5.c diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig index 9c89a5b780e8..14ab8c03e4b8 100644 --- a/drivers/mmc/host/Kconfig +++ b/drivers/mmc/host/Kconfig @@ -213,6 +213,18 @@ config MMC_SDHCI_OF_DWCMSHC If you have a controller with this interface, say Y or M here. If unsure, say N. +config MMC_SDHCI_OF_SPARX5 + tristate "SDHCI OF support for the MCHP Sparx5 SoC" + depends on MMC_SDHCI_PLTFM + depends on ARCH_SPARX5 + help + This selects the Secure Digital Host Controller Interface (SDHCI) + found in the MCHP Sparx5 SoC. + + If you have a Sparx5 SoC with this interface, say Y or M here. + + If unsure, say N. + config MMC_SDHCI_CADENCE tristate "SDHCI support for the Cadence SD/SDIO/eMMC controller" depends on MMC_SDHCI_PLTFM diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile index 4d5bcb0144a0..451c25fc2c69 100644 --- a/drivers/mmc/host/Makefile +++ b/drivers/mmc/host/Makefile @@ -94,6 +94,7 @@ obj-$(CONFIG_MMC_SDHCI_OF_AT91) += sdhci-of-at91.o obj-$(CONFIG_MMC_SDHCI_OF_ESDHC) += sdhci-of-esdhc.o obj-$(CONFIG_MMC_SDHCI_OF_HLWD) += sdhci-of-hlwd.o obj-$(CONFIG_MMC_SDHCI_OF_DWCMSHC) += sdhci-of-dwcmshc.o +obj-$(CONFIG_MMC_SDHCI_OF_SPARX5) += sdhci-of-sparx5.o obj-$(CONFIG_MMC_SDHCI_BCM_KONA) += sdhci-bcm-kona.o obj-$(CONFIG_MMC_SDHCI_IPROC) += sdhci-iproc.o obj-$(CONFIG_MMC_SDHCI_MSM) += sdhci-msm.o diff --git a/drivers/mmc/host/sdhci-of-sparx5.c b/drivers/mmc/host/sdhci-of-sparx5.c new file mode 100644 index 000000000000..14b5dad6575a --- /dev/null +++ b/drivers/mmc/host/sdhci-of-sparx5.c @@ -0,0 +1,269 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * drivers/mmc/host/sdhci-of-sparx5.c + * + * MCHP Sparx5 SoC Secure Digital Host Controller Interface. + * + * Copyright (c) 2019 Microchip Inc. + * + * Author: Lars Povlsen + */ + +#include +#include +#include +#include +#include +#include +#include + +#include "sdhci-pltfm.h" + +#define CPU_REGS_GENERAL_CTRL (0x22 * 4) +#define MSHC_DLY_CC_MASK GENMASK(16, 13) +#define MSHC_DLY_CC_SHIFT 13 +#define MSHC_DLY_CC_MAX 15 + +#define CPU_REGS_PROC_CTRL (0x2C * 4) +#define ACP_CACHE_FORCE_ENA BIT(4) +#define ACP_AWCACHE BIT(3) +#define ACP_ARCACHE BIT(2) +#define ACP_CACHE_MASK (ACP_CACHE_FORCE_ENA|ACP_AWCACHE|ACP_ARCACHE) + +#define MSHC2_VERSION 0x500 /* Off 0x140, reg 0x0 */ +#define MSHC2_TYPE 0x504 /* Off 0x140, reg 0x1 */ +#define MSHC2_EMMC_CTRL 0x52c /* Off 0x140, reg 0xB */ +#define MSHC2_EMMC_CTRL_EMMC_RST_N BIT(2) +#define MSHC2_EMMC_CTRL_IS_EMMC BIT(0) + +struct sdhci_sparx5_data { + struct sdhci_host *host; + struct regmap *cpu_ctrl; + int delay_clock; +}; + +#define BOUNDARY_OK(addr, len) \ + ((addr | (SZ_128M - 1)) == ((addr + len - 1) | (SZ_128M - 1))) + +/* + * If DMA addr spans 128MB boundary, we split the DMA transfer into two + * so that each DMA transfer doesn't exceed the boundary. + */ +static void sdhci_sparx5_adma_write_desc(struct sdhci_host *host, void **desc, + dma_addr_t addr, int len, + unsigned int cmd) +{ + int tmplen, offset; + + if (likely(!len || BOUNDARY_OK(addr, len))) { + sdhci_adma_write_desc(host, desc, addr, len, cmd); + return; + } + + pr_debug("%s: write_desc: splitting dma len %d, offset 0x%0llx\n", + mmc_hostname(host->mmc), len, addr); + + offset = addr & (SZ_128M - 1); + tmplen = SZ_128M - offset; + sdhci_adma_write_desc(host, desc, addr, tmplen, cmd); + + addr += tmplen; + len -= tmplen; + sdhci_adma_write_desc(host, desc, addr, len, cmd); +} + +static void sparx5_set_cacheable(struct sdhci_host *host, u32 value) +{ + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); + struct sdhci_sparx5_data *sdhci_sparx5 = sdhci_pltfm_priv(pltfm_host); + + pr_debug("%s: Set Cacheable = 0x%x\n", mmc_hostname(host->mmc), value); + + /* Update ACP caching attributes in HW */ + regmap_update_bits(sdhci_sparx5->cpu_ctrl, + CPU_REGS_PROC_CTRL, ACP_CACHE_MASK, value); +} + +static void sparx5_set_delay(struct sdhci_host *host, u8 value) +{ + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); + struct sdhci_sparx5_data *sdhci_sparx5 = sdhci_pltfm_priv(pltfm_host); + + pr_debug("%s: Set DLY_CC = %u\n", mmc_hostname(host->mmc), value); + + /* Update DLY_CC in HW */ + regmap_update_bits(sdhci_sparx5->cpu_ctrl, + CPU_REGS_GENERAL_CTRL, + MSHC_DLY_CC_MASK, + (value << MSHC_DLY_CC_SHIFT)); +} + +static void sdhci_sparx5_set_emmc(struct sdhci_host *host) +{ + if (!mmc_card_is_removable(host->mmc)) { + u8 value; + + value = sdhci_readb(host, MSHC2_EMMC_CTRL); + if (!(value & MSHC2_EMMC_CTRL_IS_EMMC)) { + value |= MSHC2_EMMC_CTRL_IS_EMMC; + pr_debug("%s: Set EMMC_CTRL: 0x%08x\n", + mmc_hostname(host->mmc), value); + sdhci_writeb(host, value, MSHC2_EMMC_CTRL); + } + } +} + +static void sdhci_sparx5_reset_emmc(struct sdhci_host *host) +{ + u8 value; + + pr_debug("%s: Toggle EMMC_CTRL.EMMC_RST_N\n", mmc_hostname(host->mmc)); + value = sdhci_readb(host, MSHC2_EMMC_CTRL) & + ~MSHC2_EMMC_CTRL_EMMC_RST_N; + sdhci_writeb(host, value, MSHC2_EMMC_CTRL); + /* For eMMC, minimum is 1us but give it 10us for good measure */ + usleep_range(10, 20); + sdhci_writeb(host, value | MSHC2_EMMC_CTRL_EMMC_RST_N, + MSHC2_EMMC_CTRL); + /* For eMMC, minimum is 200us but give it 300us for good measure */ + usleep_range(300, 400); +} + +static void sdhci_sparx5_reset(struct sdhci_host *host, u8 mask) +{ + pr_debug("%s: *** RESET: mask %d\n", mmc_hostname(host->mmc), mask); + + sdhci_reset(host, mask); + + /* Be sure CARD_IS_EMMC stays set */ + sdhci_sparx5_set_emmc(host); +} + +static const struct sdhci_ops sdhci_sparx5_ops = { + .set_clock = sdhci_set_clock, + .set_bus_width = sdhci_set_bus_width, + .set_uhs_signaling = sdhci_set_uhs_signaling, + .get_max_clock = sdhci_pltfm_clk_get_max_clock, + .reset = sdhci_sparx5_reset, + .adma_write_desc = sdhci_sparx5_adma_write_desc, +}; + +static const struct sdhci_pltfm_data sdhci_sparx5_pdata = { + .quirks = 0, + .quirks2 = SDHCI_QUIRK2_HOST_NO_CMD23 | /* Controller issue */ + SDHCI_QUIRK2_NO_1_8_V, /* No sdr104, ddr50, etc */ + .ops = &sdhci_sparx5_ops, +}; + +static int sdhci_sparx5_probe(struct platform_device *pdev) +{ + int ret; + const char *syscon = "microchip,sparx5-cpu-syscon"; + struct sdhci_host *host; + struct sdhci_pltfm_host *pltfm_host; + struct sdhci_sparx5_data *sdhci_sparx5; + struct device_node *np = pdev->dev.of_node; + u32 value; + u32 extra; + + host = sdhci_pltfm_init(pdev, &sdhci_sparx5_pdata, + sizeof(*sdhci_sparx5)); + + if (IS_ERR(host)) + return PTR_ERR(host); + + /* + * extra adma table cnt for cross 128M boundary handling. + */ + extra = DIV_ROUND_UP_ULL(dma_get_required_mask(&pdev->dev), SZ_128M); + if (extra > SDHCI_MAX_SEGS) + extra = SDHCI_MAX_SEGS; + host->adma_table_cnt += extra; + + pltfm_host = sdhci_priv(host); + sdhci_sparx5 = sdhci_pltfm_priv(pltfm_host); + sdhci_sparx5->host = host; + + pltfm_host->clk = devm_clk_get(&pdev->dev, "core"); + if (IS_ERR(pltfm_host->clk)) { + ret = PTR_ERR(pltfm_host->clk); + dev_err(&pdev->dev, "failed to get core clk: %d\n", ret); + goto free_pltfm; + } + ret = clk_prepare_enable(pltfm_host->clk); + if (ret) + goto free_pltfm; + + if (!of_property_read_u32(np, "microchip,clock-delay", &value) && + (value > 0 && value <= MSHC_DLY_CC_MAX)) + sdhci_sparx5->delay_clock = value; + + sdhci_get_of_property(pdev); + + ret = mmc_of_parse(host->mmc); + if (ret) + goto err_clk; + + sdhci_sparx5->cpu_ctrl = syscon_regmap_lookup_by_compatible(syscon); + if (IS_ERR(sdhci_sparx5->cpu_ctrl)) { + dev_err(&pdev->dev, "No CPU syscon regmap !\n"); + ret = PTR_ERR(sdhci_sparx5->cpu_ctrl); + goto err_clk; + } + + if (sdhci_sparx5->delay_clock >= 0) + sparx5_set_delay(host, sdhci_sparx5->delay_clock); + + if (!mmc_card_is_removable(host->mmc)) { + /* Do a HW reset of eMMC card */ + sdhci_sparx5_reset_emmc(host); + /* Update EMMC_CTRL */ + sdhci_sparx5_set_emmc(host); + /* If eMMC, disable SD and SDIO */ + host->mmc->caps2 |= (MMC_CAP2_NO_SDIO|MMC_CAP2_NO_SD); + } + + ret = sdhci_add_host(host); + if (ret) + goto err_clk; + + /* Set AXI bus master to use un-cached access (for DMA) */ + if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA) && + IS_ENABLED(CONFIG_DMA_DECLARE_COHERENT)) + sparx5_set_cacheable(host, ACP_CACHE_FORCE_ENA); + + pr_debug("%s: SDHC version: 0x%08x\n", + mmc_hostname(host->mmc), sdhci_readl(host, MSHC2_VERSION)); + pr_debug("%s: SDHC type: 0x%08x\n", + mmc_hostname(host->mmc), sdhci_readl(host, MSHC2_TYPE)); + + return ret; + +err_clk: + clk_disable_unprepare(pltfm_host->clk); +free_pltfm: + sdhci_pltfm_free(pdev); + return ret; +} + +static const struct of_device_id sdhci_sparx5_of_match[] = { + { .compatible = "microchip,dw-sparx5-sdhci" }, + { } +}; +MODULE_DEVICE_TABLE(of, sdhci_sparx5_of_match); + +static struct platform_driver sdhci_sparx5_driver = { + .driver = { + .name = "sdhci-sparx5", + .of_match_table = sdhci_sparx5_of_match, + .pm = &sdhci_pltfm_pmops, + }, + .probe = sdhci_sparx5_probe, + .remove = sdhci_pltfm_unregister, +}; + +module_platform_driver(sdhci_sparx5_driver); + +MODULE_DESCRIPTION("Sparx5 SDHCI OF driver"); +MODULE_AUTHOR("Lars Povlsen "); +MODULE_LICENSE("GPL v2");