diff options
Diffstat (limited to 'drivers/usb/dwc3/dwc3-generic-plat.c')
| -rw-r--r-- | drivers/usb/dwc3/dwc3-generic-plat.c | 166 |
1 files changed, 166 insertions, 0 deletions
diff --git a/drivers/usb/dwc3/dwc3-generic-plat.c b/drivers/usb/dwc3/dwc3-generic-plat.c new file mode 100644 index 000000000000..d96b20570002 --- /dev/null +++ b/drivers/usb/dwc3/dwc3-generic-plat.c @@ -0,0 +1,166 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * dwc3-generic-plat.c - DesignWare USB3 generic platform driver + * + * Copyright (C) 2025 Ze Huang <huang.ze@linux.dev> + * + * Inspired by dwc3-qcom.c and dwc3-of-simple.c + */ + +#include <linux/clk.h> +#include <linux/platform_device.h> +#include <linux/reset.h> +#include "glue.h" + +struct dwc3_generic { + struct device *dev; + struct dwc3 dwc; + struct clk_bulk_data *clks; + int num_clocks; + struct reset_control *resets; +}; + +#define to_dwc3_generic(d) container_of((d), struct dwc3_generic, dwc) + +static void dwc3_generic_reset_control_assert(void *data) +{ + reset_control_assert(data); +} + +static int dwc3_generic_probe(struct platform_device *pdev) +{ + struct dwc3_probe_data probe_data = {}; + struct device *dev = &pdev->dev; + struct dwc3_generic *dwc3g; + struct resource *res; + int ret; + + dwc3g = devm_kzalloc(dev, sizeof(*dwc3g), GFP_KERNEL); + if (!dwc3g) + return -ENOMEM; + + dwc3g->dev = dev; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) { + dev_err(&pdev->dev, "missing memory resource\n"); + return -ENODEV; + } + + dwc3g->resets = devm_reset_control_array_get_optional_exclusive(dev); + if (IS_ERR(dwc3g->resets)) + return dev_err_probe(dev, PTR_ERR(dwc3g->resets), "failed to get resets\n"); + + ret = reset_control_assert(dwc3g->resets); + if (ret) + return dev_err_probe(dev, ret, "failed to assert resets\n"); + + /* Not strict timing, just for safety */ + udelay(2); + + ret = reset_control_deassert(dwc3g->resets); + if (ret) + return dev_err_probe(dev, ret, "failed to deassert resets\n"); + + ret = devm_add_action_or_reset(dev, dwc3_generic_reset_control_assert, dwc3g->resets); + if (ret) + return ret; + + ret = devm_clk_bulk_get_all_enabled(dwc3g->dev, &dwc3g->clks); + if (ret < 0) + return dev_err_probe(dev, ret, "failed to get clocks\n"); + + dwc3g->num_clocks = ret; + dwc3g->dwc.dev = dev; + probe_data.dwc = &dwc3g->dwc; + probe_data.res = res; + probe_data.ignore_clocks_and_resets = true; + ret = dwc3_core_probe(&probe_data); + if (ret) + return dev_err_probe(dev, ret, "failed to register DWC3 Core\n"); + + return 0; +} + +static void dwc3_generic_remove(struct platform_device *pdev) +{ + struct dwc3 *dwc = platform_get_drvdata(pdev); + struct dwc3_generic *dwc3g = to_dwc3_generic(dwc); + + dwc3_core_remove(dwc); + + clk_bulk_disable_unprepare(dwc3g->num_clocks, dwc3g->clks); +} + +static int dwc3_generic_suspend(struct device *dev) +{ + struct dwc3 *dwc = dev_get_drvdata(dev); + struct dwc3_generic *dwc3g = to_dwc3_generic(dwc); + int ret; + + ret = dwc3_pm_suspend(dwc); + if (ret) + return ret; + + clk_bulk_disable_unprepare(dwc3g->num_clocks, dwc3g->clks); + + return 0; +} + +static int dwc3_generic_resume(struct device *dev) +{ + struct dwc3 *dwc = dev_get_drvdata(dev); + struct dwc3_generic *dwc3g = to_dwc3_generic(dwc); + int ret; + + ret = clk_bulk_prepare_enable(dwc3g->num_clocks, dwc3g->clks); + if (ret) + return ret; + + ret = dwc3_pm_resume(dwc); + if (ret) + return ret; + + return 0; +} + +static int dwc3_generic_runtime_suspend(struct device *dev) +{ + return dwc3_runtime_suspend(dev_get_drvdata(dev)); +} + +static int dwc3_generic_runtime_resume(struct device *dev) +{ + return dwc3_runtime_resume(dev_get_drvdata(dev)); +} + +static int dwc3_generic_runtime_idle(struct device *dev) +{ + return dwc3_runtime_idle(dev_get_drvdata(dev)); +} + +static const struct dev_pm_ops dwc3_generic_dev_pm_ops = { + SYSTEM_SLEEP_PM_OPS(dwc3_generic_suspend, dwc3_generic_resume) + RUNTIME_PM_OPS(dwc3_generic_runtime_suspend, dwc3_generic_runtime_resume, + dwc3_generic_runtime_idle) +}; + +static const struct of_device_id dwc3_generic_of_match[] = { + { .compatible = "spacemit,k1-dwc3", }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, dwc3_generic_of_match); + +static struct platform_driver dwc3_generic_driver = { + .probe = dwc3_generic_probe, + .remove = dwc3_generic_remove, + .driver = { + .name = "dwc3-generic-plat", + .of_match_table = dwc3_generic_of_match, + .pm = pm_ptr(&dwc3_generic_dev_pm_ops), + }, +}; +module_platform_driver(dwc3_generic_driver); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("DesignWare USB3 generic platform driver"); |