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// SPDX-License-Identifier: GPL-2.0
/*
* cdns3-starfive.c - StarFive specific Glue layer for Cadence USB Controller
*
* Copyright (C) 2023 StarFive Technology Co., Ltd.
*
* Author: Minda Chen <minda.chen@starfivetech.com>
*/
#include <linux/bits.h>
#include <linux/clk.h>
#include <linux/module.h>
#include <linux/mfd/syscon.h>
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/of_platform.h>
#include <linux/reset.h>
#include <linux/regmap.h>
#include <linux/usb/otg.h>
#include "core.h"
#define USB_STRAP_HOST BIT(17)
#define USB_STRAP_DEVICE BIT(18)
#define USB_STRAP_MASK GENMASK(18, 16)
#define USB_SUSPENDM_HOST BIT(19)
#define USB_SUSPENDM_MASK BIT(19)
#define USB_MISC_CFG_MASK GENMASK(23, 20)
#define USB_SUSPENDM_BYPS BIT(20)
#define USB_PLL_EN BIT(22)
#define USB_REFCLK_MODE BIT(23)
struct cdns_starfive {
struct device *dev;
struct regmap *stg_syscon;
struct reset_control *resets;
struct clk_bulk_data *clks;
int num_clks;
u32 stg_usb_mode;
};
static void cdns_mode_init(struct platform_device *pdev,
struct cdns_starfive *data)
{
enum usb_dr_mode mode;
regmap_update_bits(data->stg_syscon, data->stg_usb_mode,
USB_MISC_CFG_MASK,
USB_SUSPENDM_BYPS | USB_PLL_EN | USB_REFCLK_MODE);
/* dr mode setting */
mode = usb_get_dr_mode(&pdev->dev);
switch (mode) {
case USB_DR_MODE_HOST:
regmap_update_bits(data->stg_syscon,
data->stg_usb_mode,
USB_STRAP_MASK,
USB_STRAP_HOST);
regmap_update_bits(data->stg_syscon,
data->stg_usb_mode,
USB_SUSPENDM_MASK,
USB_SUSPENDM_HOST);
break;
case USB_DR_MODE_PERIPHERAL:
regmap_update_bits(data->stg_syscon, data->stg_usb_mode,
USB_STRAP_MASK, USB_STRAP_DEVICE);
regmap_update_bits(data->stg_syscon, data->stg_usb_mode,
USB_SUSPENDM_MASK, 0);
break;
default:
break;
}
}
static int cdns_clk_rst_init(struct cdns_starfive *data)
{
int ret;
ret = clk_bulk_prepare_enable(data->num_clks, data->clks);
if (ret)
return dev_err_probe(data->dev, ret,
"failed to enable clocks\n");
ret = reset_control_deassert(data->resets);
if (ret) {
dev_err(data->dev, "failed to reset clocks\n");
goto err_clk_init;
}
return ret;
err_clk_init:
clk_bulk_disable_unprepare(data->num_clks, data->clks);
return ret;
}
static void cdns_clk_rst_deinit(struct cdns_starfive *data)
{
reset_control_assert(data->resets);
clk_bulk_disable_unprepare(data->num_clks, data->clks);
}
static int cdns_starfive_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct cdns_starfive *data;
unsigned int args;
int ret;
data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
data->dev = dev;
data->stg_syscon =
syscon_regmap_lookup_by_phandle_args(pdev->dev.of_node,
"starfive,stg-syscon", 1, &args);
if (IS_ERR(data->stg_syscon))
return dev_err_probe(dev, PTR_ERR(data->stg_syscon),
"Failed to parse starfive,stg-syscon\n");
data->stg_usb_mode = args;
data->num_clks = devm_clk_bulk_get_all(data->dev, &data->clks);
if (data->num_clks < 0)
return dev_err_probe(data->dev, -ENODEV,
"Failed to get clocks\n");
data->resets = devm_reset_control_array_get_exclusive(data->dev);
if (IS_ERR(data->resets))
return dev_err_probe(data->dev, PTR_ERR(data->resets),
"Failed to get resets");
cdns_mode_init(pdev, data);
ret = cdns_clk_rst_init(data);
if (ret)
return ret;
ret = of_platform_populate(dev->of_node, NULL, NULL, dev);
if (ret) {
dev_err(dev, "Failed to create children\n");
cdns_clk_rst_deinit(data);
return ret;
}
device_set_wakeup_capable(dev, true);
pm_runtime_set_active(dev);
pm_runtime_enable(dev);
platform_set_drvdata(pdev, data);
return 0;
}
static int cdns_starfive_remove_core(struct device *dev, void *c)
{
struct platform_device *pdev = to_platform_device(dev);
platform_device_unregister(pdev);
return 0;
}
static void cdns_starfive_remove(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct cdns_starfive *data = dev_get_drvdata(dev);
pm_runtime_get_sync(dev);
device_for_each_child(dev, NULL, cdns_starfive_remove_core);
pm_runtime_disable(dev);
pm_runtime_put_noidle(dev);
cdns_clk_rst_deinit(data);
platform_set_drvdata(pdev, NULL);
}
#ifdef CONFIG_PM
static int cdns_starfive_runtime_resume(struct device *dev)
{
struct cdns_starfive *data = dev_get_drvdata(dev);
return clk_bulk_prepare_enable(data->num_clks, data->clks);
}
static int cdns_starfive_runtime_suspend(struct device *dev)
{
struct cdns_starfive *data = dev_get_drvdata(dev);
clk_bulk_disable_unprepare(data->num_clks, data->clks);
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int cdns_starfive_resume(struct device *dev)
{
struct cdns_starfive *data = dev_get_drvdata(dev);
return cdns_clk_rst_init(data);
}
static int cdns_starfive_suspend(struct device *dev)
{
struct cdns_starfive *data = dev_get_drvdata(dev);
cdns_clk_rst_deinit(data);
return 0;
}
#endif
#endif
static const struct dev_pm_ops cdns_starfive_pm_ops = {
SET_RUNTIME_PM_OPS(cdns_starfive_runtime_suspend,
cdns_starfive_runtime_resume, NULL)
SET_SYSTEM_SLEEP_PM_OPS(cdns_starfive_suspend, cdns_starfive_resume)
};
static const struct of_device_id cdns_starfive_of_match[] = {
{ .compatible = "starfive,jh7110-usb", },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, cdns_starfive_of_match);
static struct platform_driver cdns_starfive_driver = {
.probe = cdns_starfive_probe,
.remove_new = cdns_starfive_remove,
.driver = {
.name = "cdns3-starfive",
.of_match_table = cdns_starfive_of_match,
.pm = &cdns_starfive_pm_ops,
},
};
module_platform_driver(cdns_starfive_driver);
MODULE_ALIAS("platform:cdns3-starfive");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("Cadence USB3 StarFive Glue Layer");
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