Commit 70f13579 authored by Tomer Maimon's avatar Tomer Maimon Committed by Greg Kroah-Hartman
Browse files

usb: chipidea: Add support for NPCM 



Add Nuvoton NPCM BMC SoCs support to USB ChipIdea driver.
NPCM SoC includes ChipIdea IP block that is used for USB device controller
mode.

Signed-off-by: default avatarTomer Maimon <tmaimon77@gmail.com>
Acked-by: default avatarPeter Chen <peter.chen@kernel.org>
Link: https://lore.kernel.org/r/20231017195903.1665260-4-tmaimon77@gmail.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent ceae398f

drivers/usb/chipidea/Kconfig

+4 −0
Original line number Diff line number Diff line
@@ -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

drivers/usb/chipidea/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -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

drivers/usb/chipidea/ci_hdrc_npcm.c

0 → 100644
+114 −0
Original line number Diff line number Diff line 
// 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 (%d)\n",event);

		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)

		return dev_err_probe(dev, ret, "failed to enable the clock: %d\n", 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@nuvoton.com>");

MODULE_LICENSE("GPL v2");