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Message-ID: <20230928095544.GB2081690@nchen-desktop>
Date: Thu, 28 Sep 2023 17:55:44 +0800
From: Peter Chen <peter.chen@...nel.org>
To: Tomer Maimon <tmaimon77@...il.com>
Cc: gregkh@...uxfoundation.org, robh+dt@...nel.org,
krzysztof.kozlowski+dt@...aro.org, xu.yang_2@....com,
peng.fan@....com, avifishman70@...il.com, tali.perry1@...il.com,
joel@....id.au, venture@...gle.com, yuenn@...gle.com,
benjaminfair@...gle.com, j.neuschaefer@....net,
openbmc@...ts.ozlabs.org, linux-usb@...r.kernel.org,
linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v2 3/3] usb: chipidea: Add support for NPCM
On 23-09-27 12:55:09, Tomer Maimon wrote:
> Add Nuvoton NPCM BMC SoCs support to USB ChipIdea driver.
> NPCM SoC include ChipIdea IP block that used for USB device controller
> mode.
>
> Signed-off-by: Tomer Maimon <tmaimon77@...il.com>
Acked-by: Peter Chen <peter.chen@...nel.org>
Peter
> ---
> drivers/usb/chipidea/Kconfig | 4 +
> drivers/usb/chipidea/Makefile | 1 +
> drivers/usb/chipidea/ci_hdrc_npcm.c | 117 ++++++++++++++++++++++++++++
> 3 files changed, 122 insertions(+)
> create mode 100644 drivers/usb/chipidea/ci_hdrc_npcm.c
>
> diff --git a/drivers/usb/chipidea/Kconfig b/drivers/usb/chipidea/Kconfig
> index c815824a0b2d..bab45bc62361 100644
> --- a/drivers/usb/chipidea/Kconfig
> +++ b/drivers/usb/chipidea/Kconfig
> @@ -43,6 +43,10 @@ config USB_CHIPIDEA_MSM
> tristate "Enable MSM hsusb glue driver" if EXPERT
> default USB_CHIPIDEA
>
> +config USB_CHIPIDEA_NPCM
> + tristate "Enable NPCM hsusb glue driver" if EXPERT
> + default USB_CHIPIDEA
> +
> config USB_CHIPIDEA_IMX
> tristate "Enable i.MX USB glue driver" if EXPERT
> depends on OF
> diff --git a/drivers/usb/chipidea/Makefile b/drivers/usb/chipidea/Makefile
> index 71afeab97e83..718cb24603dd 100644
> --- a/drivers/usb/chipidea/Makefile
> +++ b/drivers/usb/chipidea/Makefile
> @@ -13,6 +13,7 @@ ci_hdrc-$(CONFIG_USB_OTG_FSM) += otg_fsm.o
>
> obj-$(CONFIG_USB_CHIPIDEA_GENERIC) += ci_hdrc_usb2.o
> obj-$(CONFIG_USB_CHIPIDEA_MSM) += ci_hdrc_msm.o
> +obj-$(CONFIG_USB_CHIPIDEA_NPCM) += ci_hdrc_npcm.o
> obj-$(CONFIG_USB_CHIPIDEA_PCI) += ci_hdrc_pci.o
> obj-$(CONFIG_USB_CHIPIDEA_IMX) += usbmisc_imx.o ci_hdrc_imx.o
> obj-$(CONFIG_USB_CHIPIDEA_TEGRA) += ci_hdrc_tegra.o
> diff --git a/drivers/usb/chipidea/ci_hdrc_npcm.c b/drivers/usb/chipidea/ci_hdrc_npcm.c
> new file mode 100644
> index 000000000000..4169855e7940
> --- /dev/null
> +++ b/drivers/usb/chipidea/ci_hdrc_npcm.c
> @@ -0,0 +1,117 @@
> +// SPDX-License-Identifier: GPL-2.0
> +// Copyright (c) 2023 Nuvoton Technology corporation.
> +
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/usb/chipidea.h>
> +#include <linux/clk.h>
> +#include <linux/io.h>
> +#include <linux/reset-controller.h>
> +#include <linux/of.h>
> +
> +#include "ci.h"
> +
> +struct npcm_udc_data {
> + struct platform_device *ci;
> + struct clk *core_clk;
> + struct ci_hdrc_platform_data pdata;
> +};
> +
> +static int npcm_udc_notify_event(struct ci_hdrc *ci, unsigned event)
> +{
> + struct device *dev = ci->dev->parent;
> +
> + switch (event) {
> + case CI_HDRC_CONTROLLER_RESET_EVENT:
> + /* clear all mode bits */
> + hw_write(ci, OP_USBMODE, 0xffffffff, 0x0);
> + break;
> + default:
> + dev_dbg(dev, "unknown ci_hdrc event\n");
> + break;
> + }
> +
> + return 0;
> +}
> +
> +static int npcm_udc_probe(struct platform_device *pdev)
> +{
> + int ret;
> + struct npcm_udc_data *ci;
> + struct platform_device *plat_ci;
> + struct device *dev = &pdev->dev;
> +
> + ci = devm_kzalloc(&pdev->dev, sizeof(*ci), GFP_KERNEL);
> + if (!ci)
> + return -ENOMEM;
> + platform_set_drvdata(pdev, ci);
> +
> + ci->core_clk = devm_clk_get_optional(dev, NULL);
> + if (IS_ERR(ci->core_clk))
> + return PTR_ERR(ci->core_clk);
> +
> + ret = clk_prepare_enable(ci->core_clk);
> + if (ret) {
> + dev_err(dev, "failed to enable the clock: %d\n", ret);
> + return ret;
> + }
> +
> + ci->pdata.name = dev_name(dev);
> + ci->pdata.capoffset = DEF_CAPOFFSET;
> + ci->pdata.flags = CI_HDRC_REQUIRES_ALIGNED_DMA |
> + CI_HDRC_FORCE_VBUS_ACTIVE_ALWAYS;
> + ci->pdata.phy_mode = USBPHY_INTERFACE_MODE_UTMI;
> + ci->pdata.notify_event = npcm_udc_notify_event;
> +
> + plat_ci = ci_hdrc_add_device(dev, pdev->resource, pdev->num_resources,
> + &ci->pdata);
> + if (IS_ERR(plat_ci)) {
> + ret = PTR_ERR(plat_ci);
> + dev_err(dev, "failed to register HDRC NPCM device: %d\n", ret);
> + goto clk_err;
> + }
> +
> + pm_runtime_no_callbacks(dev);
> + pm_runtime_enable(dev);
> +
> + return 0;
> +
> +clk_err:
> + clk_disable_unprepare(ci->core_clk);
> + return ret;
> +}
> +
> +static int npcm_udc_remove(struct platform_device *pdev)
> +{
> + struct npcm_udc_data *ci = platform_get_drvdata(pdev);
> +
> + pm_runtime_disable(&pdev->dev);
> + ci_hdrc_remove_device(ci->ci);
> + clk_disable_unprepare(ci->core_clk);
> +
> + return 0;
> +}
> +
> +static const struct of_device_id npcm_udc_dt_match[] = {
> + { .compatible = "nuvoton,npcm750-udc", },
> + { .compatible = "nuvoton,npcm845-udc", },
> + { }
> +};
> +MODULE_DEVICE_TABLE(of, npcm_udc_dt_match);
> +
> +static struct platform_driver npcm_udc_driver = {
> + .probe = npcm_udc_probe,
> + .remove = npcm_udc_remove,
> + .driver = {
> + .name = "npcm_udc",
> + .of_match_table = npcm_udc_dt_match,
> + },
> +};
> +
> +module_platform_driver(npcm_udc_driver);
> +
> +MODULE_DESCRIPTION("NPCM USB device controller driver");
> +MODULE_AUTHOR("Tomer Maimon <tomer.maimon@...oton.com>");
> +MODULE_ALIAS("platform:npcm-udc");
> +MODULE_LICENSE("GPL v2");
> --
> 2.33.0
>
--
Thanks,
Peter Chen
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