From mboxrd@z Thu Jan 1 00:00:00 1970 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=-9.9 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham 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 7E2D2C4CEC4 for ; Wed, 18 Sep 2019 13:39:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 52344208C0 for ; Wed, 18 Sep 2019 13:39:22 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=ti.com header.i=@ti.com header.b="DkaJsqsv" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728633AbfIRNjV (ORCPT ); Wed, 18 Sep 2019 09:39:21 -0400 Received: from lelv0143.ext.ti.com ([198.47.23.248]:53984 "EHLO lelv0143.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730220AbfIRNjU (ORCPT ); Wed, 18 Sep 2019 09:39:20 -0400 Received: from lelv0265.itg.ti.com ([10.180.67.224]) by lelv0143.ext.ti.com (8.15.2/8.15.2) with ESMTP id x8IDd3Q0063141; Wed, 18 Sep 2019 08:39:03 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1568813943; bh=vkbh30yrcTCJfdINM2lP7OAypyq1xtHtfVYZDkgedpI=; h=From:To:CC:Subject:Date:In-Reply-To:References; b=DkaJsqsvrA56bw6yvKDhdB7f/dpGcLTj2F7l5rJpC6belqMlpY6HRUoaPGZ745n+T brAerETOSwQDssM4dNfqjp2TpkE9dZUSuhKJ2Cgje4BmDCD88SLgCdGZ4CbnCxIuoH Lx1DZfbt9nwmc6wf+4mFgLK3/7QBH+UncwLBHFLA= Received: from DFLE109.ent.ti.com (dfle109.ent.ti.com [10.64.6.30]) by lelv0265.itg.ti.com (8.15.2/8.15.2) with ESMTPS id x8IDd35g029671 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=FAIL); Wed, 18 Sep 2019 08:39:03 -0500 Received: from DFLE112.ent.ti.com (10.64.6.33) by DFLE109.ent.ti.com (10.64.6.30) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1713.5; Wed, 18 Sep 2019 08:38:59 -0500 Received: from lelv0326.itg.ti.com (10.180.67.84) by DFLE112.ent.ti.com (10.64.6.33) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1713.5 via Frontend Transport; Wed, 18 Sep 2019 08:38:59 -0500 Received: from a0132425.dhcp.ti.com (ileax41-snat.itg.ti.com [10.172.224.153]) by lelv0326.itg.ti.com (8.15.2/8.15.2) with ESMTP id x8IDcocF047879; Wed, 18 Sep 2019 08:38:59 -0500 From: Vignesh Raghavendra To: Rob Herring , Mark Rutland , , Martin K Petersen CC: Alim Akhtar , Avri Altman , Pedro Sousa , Janek Kotas , , , , Vignesh Raghavendra , Subject: [PATCH 2/2] scsi: ufs: Add driver for TI wrapper for Cadence UFS IP Date: Wed, 18 Sep 2019 19:09:21 +0530 Message-ID: <20190918133921.25844-3-vigneshr@ti.com> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20190918133921.25844-1-vigneshr@ti.com> References: <20190918133921.25844-1-vigneshr@ti.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org TI's J721e SoC has a Cadence UFS IP with a TI specific wrapper. This is a minimal driver to configure the wrapper. It releases the UFS slave device out of reset and sets up registers to indicate PHY reference clock input frequency before probing child Cadence UFS driver. Signed-off-by: Vignesh Raghavendra --- drivers/scsi/ufs/Kconfig | 10 ++++ drivers/scsi/ufs/Makefile | 1 + drivers/scsi/ufs/ti-j721e-ufs.c | 90 +++++++++++++++++++++++++++++++++ 3 files changed, 101 insertions(+) create mode 100644 drivers/scsi/ufs/ti-j721e-ufs.c diff --git a/drivers/scsi/ufs/Kconfig b/drivers/scsi/ufs/Kconfig index 0b845ab7c3bf..d14c2243e02a 100644 --- a/drivers/scsi/ufs/Kconfig +++ b/drivers/scsi/ufs/Kconfig @@ -132,6 +132,16 @@ config SCSI_UFS_HISI Select this if you have UFS controller on Hisilicon chipset. If unsure, say N. +config SCSI_UFS_TI_J721E + tristate "TI glue layer for Cadence UFS Controller" + depends on OF && HAS_IOMEM && (ARCH_K3 || COMPILE_TEST) + help + This selects driver for TI glue layer for Cadence UFS Host + Controller IP. + + Selects this if you have TI platform with UFS controller. + If unsure, say N. + config SCSI_UFS_BSG bool "Universal Flash Storage BSG device node" depends on SCSI_UFSHCD diff --git a/drivers/scsi/ufs/Makefile b/drivers/scsi/ufs/Makefile index 2a9097939bcb..94c6c5d7334b 100644 --- a/drivers/scsi/ufs/Makefile +++ b/drivers/scsi/ufs/Makefile @@ -11,3 +11,4 @@ obj-$(CONFIG_SCSI_UFSHCD_PCI) += ufshcd-pci.o obj-$(CONFIG_SCSI_UFSHCD_PLATFORM) += ufshcd-pltfrm.o obj-$(CONFIG_SCSI_UFS_HISI) += ufs-hisi.o obj-$(CONFIG_SCSI_UFS_MEDIATEK) += ufs-mediatek.o +obj-$(CONFIG_SCSI_UFS_TI_J721E) += ti-j721e-ufs.o diff --git a/drivers/scsi/ufs/ti-j721e-ufs.c b/drivers/scsi/ufs/ti-j721e-ufs.c new file mode 100644 index 000000000000..a653bf1902f3 --- /dev/null +++ b/drivers/scsi/ufs/ti-j721e-ufs.c @@ -0,0 +1,90 @@ +// SPDX-License-Identifier: GPL-2.0 +// +// Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com/ +// + +#include +#include +#include +#include +#include +#include +#include + +#define UFS_SS_CTRL 0x4 +#define UFS_SS_RST_N_PCS BIT(0) +#define UFS_SS_CLK_26MHZ BIT(4) + +static int ti_j721e_ufs_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + unsigned long clk_rate; + void __iomem *regbase; + struct clk *clk; + u32 reg = 0; + int ret; + + regbase = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(regbase)) + return PTR_ERR(regbase); + + /* Select MPHY refclk frequency */ + clk = devm_clk_get(dev, NULL); + if (IS_ERR(clk)) { + dev_err(dev, "Cannot claim MPHY clock.\n"); + return PTR_ERR(clk); + } + clk_rate = clk_get_rate(clk); + if (clk_rate == 26000000) + reg |= UFS_SS_CLK_26MHZ; + devm_clk_put(dev, clk); + + pm_runtime_enable(dev); + ret = pm_runtime_get_sync(dev); + if (ret < 0) { + pm_runtime_put_noidle(dev); + return ret; + } + + /* Take UFS slave device out of reset */ + reg |= UFS_SS_RST_N_PCS; + writel(reg, regbase + UFS_SS_CTRL); + + ret = of_platform_populate(pdev->dev.of_node, NULL, NULL, + dev); + if (ret) { + dev_err(dev, "failed to populate child nodes %d\n", ret); + pm_runtime_put_sync(dev); + } + + return ret; +} + +static int ti_j721e_ufs_remove(struct platform_device *pdev) +{ + of_platform_depopulate(&pdev->dev); + pm_runtime_put_sync(&pdev->dev); + + return 0; +} + +static const struct of_device_id ti_j721e_ufs_of_match[] = { + { + .compatible = "ti,j721e-ufs", + }, + { }, +}; + +static struct platform_driver ti_j721e_ufs_driver = { + .probe = ti_j721e_ufs_probe, + .remove = ti_j721e_ufs_remove, + .driver = { + .name = "ti-j721e-ufs", + .of_match_table = ti_j721e_ufs_of_match, + }, +}; +module_platform_driver(ti_j721e_ufs_driver); + +MODULE_AUTHOR("Vignesh Raghavendra "); +MODULE_DESCRIPTION("TI UFS host controller glue driver"); +MODULE_LICENSE("GPL v2"); -- 2.23.0