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// 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 int 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 void 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);
}
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");
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