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Message-ID: <1A428C77-982A-4EB8-8FDD-A33979753660@global.cadence.com>
Date: Tue, 6 Nov 2018 13:37:21 +0000
From: Janek Kotas <jank@...ence.com>
To: "vinholikatti@...il.com" <vinholikatti@...il.com>,
"jejb@...ux.vnet.ibm.com" <jejb@...ux.vnet.ibm.com>,
"martin.petersen@...cle.com" <martin.petersen@...cle.com>
CC: "robh+dt@...nel.org" <robh+dt@...nel.org>,
"mark.rutland@....com" <mark.rutland@....com>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>
Subject: Re: [PATCH v4 2/2] scsi: ufs: Add UFS platform driver for Cadence UFS
A very gentle ping.
Could you please take a look at the proposed patch?
Thanks,
Jan
> On 20 Sep 2018, at 15:08, Janek Kotas <jank@...ence.com> wrote:
>
> This patch adds a device tree platform driver for
> Cadence UFS Host Controller.
> It can be enabled with SCSI_UFS_CDNS_PLATFORM Kconfig option.
>
> Signed-off-by: Jan Kotas <jank@...ence.com>
> ---
> drivers/scsi/ufs/Kconfig | 8 +++
> drivers/scsi/ufs/Makefile | 1 +
> drivers/scsi/ufs/cdns-pltfrm.c | 149 +++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 158 insertions(+)
> create mode 100644 drivers/scsi/ufs/cdns-pltfrm.c
>
> diff --git a/drivers/scsi/ufs/Kconfig b/drivers/scsi/ufs/Kconfig
> index e09fe6a..8f884c3 100644
> --- a/drivers/scsi/ufs/Kconfig
> +++ b/drivers/scsi/ufs/Kconfig
> @@ -80,6 +80,14 @@ config SCSI_UFSHCD_PLATFORM
>
> If unsure, say N.
>
> +config SCSI_UFS_CDNS_PLATFORM
> + tristate "Cadence UFS Controller platform driver"
> + depends on SCSI_UFSHCD_PLATFORM
> + help
> + This selects the Cadence specific additions to UFSHCD platform driver.
> +
> + If unsure, say N.
> +
> config SCSI_UFS_DWC_TC_PLATFORM
> tristate "DesignWare platform support using a G210 Test Chip"
> depends on SCSI_UFSHCD_PLATFORM
> diff --git a/drivers/scsi/ufs/Makefile b/drivers/scsi/ufs/Makefile
> index 2c50f03..e17d14a 100644
> --- a/drivers/scsi/ufs/Makefile
> +++ b/drivers/scsi/ufs/Makefile
> @@ -2,6 +2,7 @@
> # UFSHCD makefile
> obj-$(CONFIG_SCSI_UFS_DWC_TC_PCI) += tc-dwc-g210-pci.o ufshcd-dwc.o tc-dwc-g210.o
> obj-$(CONFIG_SCSI_UFS_DWC_TC_PLATFORM) += tc-dwc-g210-pltfrm.o ufshcd-dwc.o tc-dwc-g210.o
> +obj-$(CONFIG_SCSI_UFS_CDNS_PLATFORM) += cdns-pltfrm.o
> obj-$(CONFIG_SCSI_UFS_QCOM) += ufs-qcom.o
> obj-$(CONFIG_SCSI_UFSHCD) += ufshcd-core.o
> ufshcd-core-objs := ufshcd.o ufs-sysfs.o
> diff --git a/drivers/scsi/ufs/cdns-pltfrm.c b/drivers/scsi/ufs/cdns-pltfrm.c
> new file mode 100644
> index 0000000..8bcf863
> --- /dev/null
> +++ b/drivers/scsi/ufs/cdns-pltfrm.c
> @@ -0,0 +1,149 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Platform UFS Host driver for Cadence controller
> + *
> + * Copyright (C) 2018 Cadence Design Systems, Inc.
> + *
> + * Authors:
> + * Jan Kotas <jank@...ence.com>
> + *
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/of.h>
> +#include <linux/time.h>
> +
> +#include "ufshcd-pltfrm.h"
> +
> +#define CDNS_UFS_REG_HCLKDIV 0xFC
> +
> +/**
> + * Sets HCLKDIV register value based on the core_clk
> + * @hba: host controller instance
> + *
> + * Return zero for success and non-zero for failure
> + */
> +static int cdns_ufs_set_hclkdiv(struct ufs_hba *hba)
> +{
> + struct ufs_clk_info *clki;
> + struct list_head *head = &hba->clk_list_head;
> + unsigned long core_clk_rate = 0;
> + u32 core_clk_div = 0;
> +
> + if (list_empty(head))
> + return 0;
> +
> + list_for_each_entry(clki, head, list) {
> + if (IS_ERR_OR_NULL(clki->clk))
> + continue;
> + if (!strcmp(clki->name, "core_clk"))
> + core_clk_rate = clk_get_rate(clki->clk);
> + }
> +
> + if (!core_clk_rate) {
> + dev_err(hba->dev, "%s: unable to find core_clk rate\n",
> + __func__);
> + return -EINVAL;
> + }
> +
> + core_clk_div = core_clk_rate / USEC_PER_SEC;
> +
> + ufshcd_writel(hba, core_clk_div, CDNS_UFS_REG_HCLKDIV);
> + /**
> + * Make sure the register was updated,
> + * UniPro layer will not work with an incorrect value.
> + */
> + mb();
> +
> + return 0;
> +}
> +
> +/**
> + * Sets clocks used by the controller
> + * @hba: host controller instance
> + * @on: if true, enable clocks, otherwise disable
> + * @status: notify stage (pre, post change)
> + *
> + * Return zero for success and non-zero for failure
> + */
> +static int cdns_ufs_setup_clocks(struct ufs_hba *hba, bool on,
> + enum ufs_notify_change_status status)
> +{
> + if ((!on) || (status == PRE_CHANGE))
> + return 0;
> +
> + return cdns_ufs_set_hclkdiv(hba);
> +}
> +
> +static struct ufs_hba_variant_ops cdns_pltfm_hba_vops = {
> + .name = "cdns-ufs-pltfm",
> + .setup_clocks = cdns_ufs_setup_clocks,
> +};
> +
> +/**
> + * cdns_ufs_pltfrm_probe - probe routine of the driver
> + * @pdev: pointer to platform device handle
> + *
> + * Return zero for success and non-zero for failure
> + */
> +static int cdns_ufs_pltfrm_probe(struct platform_device *pdev)
> +{
> + int err;
> + struct device *dev = &pdev->dev;
> +
> + /* Perform generic probe */
> + err = ufshcd_pltfrm_init(pdev, &cdns_pltfm_hba_vops);
> + if (err)
> + dev_err(dev, "ufshcd_pltfrm_init() failed %d\n", err);
> +
> + return err;
> +}
> +
> +/**
> + * cdns_ufs_pltfrm_remove - removes the ufs driver
> + * @pdev: pointer to platform device handle
> + *
> + * Always returns 0
> + */
> +static int cdns_ufs_pltfrm_remove(struct platform_device *pdev)
> +{
> + struct ufs_hba *hba = platform_get_drvdata(pdev);
> +
> + ufshcd_remove(hba);
> + return 0;
> +}
> +
> +static const struct of_device_id cdns_ufs_of_match[] = {
> + { .compatible = "cdns,ufshc" },
> + {},
> +};
> +
> +MODULE_DEVICE_TABLE(of, cdns_ufs_of_match);
> +
> +static const struct dev_pm_ops cdns_ufs_dev_pm_ops = {
> + .suspend = ufshcd_pltfrm_suspend,
> + .resume = ufshcd_pltfrm_resume,
> + .runtime_suspend = ufshcd_pltfrm_runtime_suspend,
> + .runtime_resume = ufshcd_pltfrm_runtime_resume,
> + .runtime_idle = ufshcd_pltfrm_runtime_idle,
> +};
> +
> +static struct platform_driver cdns_ufs_pltfrm_driver = {
> + .probe = cdns_ufs_pltfrm_probe,
> + .remove = cdns_ufs_pltfrm_remove,
> + .driver = {
> + .name = "cdns-ufshcd",
> + .owner = THIS_MODULE,
> + .pm = &cdns_ufs_dev_pm_ops,
> + .of_match_table = cdns_ufs_of_match,
> + },
> +};
> +
> +module_platform_driver(cdns_ufs_pltfrm_driver);
> +
> +MODULE_AUTHOR("Jan Kotas <jank@...ence.com>");
> +MODULE_DESCRIPTION("Cadence UFS host controller platform driver");
> +MODULE_LICENSE("GPL v2");
> +MODULE_VERSION(UFSHCD_DRIVER_VERSION);
> --
> 1.9.0
>
>
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