| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * Generic platform ohci driver |
| * |
| * Copyright 2007 Michael Buesch <m@bues.ch> |
| * Copyright 2011-2012 Hauke Mehrtens <hauke@hauke-m.de> |
| * Copyright 2014 Hans de Goede <hdegoede@redhat.com> |
| * |
| * Derived from the OCHI-SSB driver |
| * Derived from the OHCI-PCI driver |
| * Copyright 1999 Roman Weissgaerber |
| * Copyright 2000-2002 David Brownell |
| * Copyright 1999 Linus Torvalds |
| * Copyright 1999 Gregory P. Smith |
| */ |
| |
| #include <linux/clk.h> |
| #include <linux/dma-mapping.h> |
| #include <linux/hrtimer.h> |
| #include <linux/io.h> |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/err.h> |
| #include <linux/of.h> |
| #include <linux/platform_device.h> |
| #include <linux/pm_runtime.h> |
| #include <linux/reset.h> |
| #include <linux/usb/ohci_pdriver.h> |
| #include <linux/usb.h> |
| #include <linux/usb/hcd.h> |
| |
| #include "ohci.h" |
| |
| #define DRIVER_DESC "OHCI generic platform driver" |
| #define OHCI_MAX_CLKS 3 |
| #define hcd_to_ohci_priv(h) ((struct ohci_platform_priv *)hcd_to_ohci(h)->priv) |
| |
| struct ohci_platform_priv { |
| struct clk *clks[OHCI_MAX_CLKS]; |
| struct reset_control *resets; |
| }; |
| |
| static const char hcd_name[] = "ohci-platform"; |
| |
| static int ohci_platform_power_on(struct platform_device *dev) |
| { |
| struct usb_hcd *hcd = platform_get_drvdata(dev); |
| struct ohci_platform_priv *priv = hcd_to_ohci_priv(hcd); |
| int clk, ret; |
| |
| for (clk = 0; clk < OHCI_MAX_CLKS && priv->clks[clk]; clk++) { |
| ret = clk_prepare_enable(priv->clks[clk]); |
| if (ret) |
| goto err_disable_clks; |
| } |
| |
| return 0; |
| |
| err_disable_clks: |
| while (--clk >= 0) |
| clk_disable_unprepare(priv->clks[clk]); |
| |
| return ret; |
| } |
| |
| static void ohci_platform_power_off(struct platform_device *dev) |
| { |
| struct usb_hcd *hcd = platform_get_drvdata(dev); |
| struct ohci_platform_priv *priv = hcd_to_ohci_priv(hcd); |
| int clk; |
| |
| for (clk = OHCI_MAX_CLKS - 1; clk >= 0; clk--) |
| if (priv->clks[clk]) |
| clk_disable_unprepare(priv->clks[clk]); |
| } |
| |
| static struct hc_driver __read_mostly ohci_platform_hc_driver; |
| |
| static const struct ohci_driver_overrides platform_overrides __initconst = { |
| .product_desc = "Generic Platform OHCI controller", |
| .extra_priv_size = sizeof(struct ohci_platform_priv), |
| }; |
| |
| static struct usb_ohci_pdata ohci_platform_defaults = { |
| .power_on = ohci_platform_power_on, |
| .power_suspend = ohci_platform_power_off, |
| .power_off = ohci_platform_power_off, |
| }; |
| |
| static int ohci_platform_probe(struct platform_device *dev) |
| { |
| struct usb_hcd *hcd; |
| struct resource *res_mem; |
| struct usb_ohci_pdata *pdata = dev_get_platdata(&dev->dev); |
| struct ohci_platform_priv *priv; |
| struct ohci_hcd *ohci; |
| int err, irq, clk = 0; |
| |
| if (usb_disabled()) |
| return -ENODEV; |
| |
| /* |
| * Use reasonable defaults so platforms don't have to provide these |
| * with DT probing on ARM. |
| */ |
| if (!pdata) |
| pdata = &ohci_platform_defaults; |
| |
| err = dma_coerce_mask_and_coherent(&dev->dev, DMA_BIT_MASK(32)); |
| if (err) |
| return err; |
| |
| irq = platform_get_irq(dev, 0); |
| if (irq < 0) { |
| dev_err(&dev->dev, "no irq provided"); |
| return irq; |
| } |
| |
| hcd = usb_create_hcd(&ohci_platform_hc_driver, &dev->dev, |
| dev_name(&dev->dev)); |
| if (!hcd) |
| return -ENOMEM; |
| |
| platform_set_drvdata(dev, hcd); |
| dev->dev.platform_data = pdata; |
| priv = hcd_to_ohci_priv(hcd); |
| ohci = hcd_to_ohci(hcd); |
| |
| if (pdata == &ohci_platform_defaults && dev->dev.of_node) { |
| if (of_property_read_bool(dev->dev.of_node, "big-endian-regs")) |
| ohci->flags |= OHCI_QUIRK_BE_MMIO; |
| |
| if (of_property_read_bool(dev->dev.of_node, "big-endian-desc")) |
| ohci->flags |= OHCI_QUIRK_BE_DESC; |
| |
| if (of_property_read_bool(dev->dev.of_node, "big-endian")) |
| ohci->flags |= OHCI_QUIRK_BE_MMIO | OHCI_QUIRK_BE_DESC; |
| |
| if (of_property_read_bool(dev->dev.of_node, "no-big-frame-no")) |
| ohci->flags |= OHCI_QUIRK_FRAME_NO; |
| |
| if (of_property_read_bool(dev->dev.of_node, |
| "remote-wakeup-connected")) |
| ohci->hc_control = OHCI_CTRL_RWC; |
| |
| of_property_read_u32(dev->dev.of_node, "num-ports", |
| &ohci->num_ports); |
| |
| for (clk = 0; clk < OHCI_MAX_CLKS; clk++) { |
| priv->clks[clk] = of_clk_get(dev->dev.of_node, clk); |
| if (IS_ERR(priv->clks[clk])) { |
| err = PTR_ERR(priv->clks[clk]); |
| if (err == -EPROBE_DEFER) |
| goto err_put_clks; |
| priv->clks[clk] = NULL; |
| break; |
| } |
| } |
| |
| priv->resets = devm_reset_control_array_get_optional_shared( |
| &dev->dev); |
| if (IS_ERR(priv->resets)) { |
| err = PTR_ERR(priv->resets); |
| goto err_put_clks; |
| } |
| |
| err = reset_control_deassert(priv->resets); |
| if (err) |
| goto err_put_clks; |
| } |
| |
| if (pdata->big_endian_desc) |
| ohci->flags |= OHCI_QUIRK_BE_DESC; |
| if (pdata->big_endian_mmio) |
| ohci->flags |= OHCI_QUIRK_BE_MMIO; |
| if (pdata->no_big_frame_no) |
| ohci->flags |= OHCI_QUIRK_FRAME_NO; |
| if (pdata->num_ports) |
| ohci->num_ports = pdata->num_ports; |
| |
| #ifndef CONFIG_USB_OHCI_BIG_ENDIAN_MMIO |
| if (ohci->flags & OHCI_QUIRK_BE_MMIO) { |
| dev_err(&dev->dev, |
| "Error: CONFIG_USB_OHCI_BIG_ENDIAN_MMIO not set\n"); |
| err = -EINVAL; |
| goto err_reset; |
| } |
| #endif |
| #ifndef CONFIG_USB_OHCI_BIG_ENDIAN_DESC |
| if (ohci->flags & OHCI_QUIRK_BE_DESC) { |
| dev_err(&dev->dev, |
| "Error: CONFIG_USB_OHCI_BIG_ENDIAN_DESC not set\n"); |
| err = -EINVAL; |
| goto err_reset; |
| } |
| #endif |
| |
| pm_runtime_set_active(&dev->dev); |
| pm_runtime_enable(&dev->dev); |
| if (pdata->power_on) { |
| err = pdata->power_on(dev); |
| if (err < 0) |
| goto err_reset; |
| } |
| |
| res_mem = platform_get_resource(dev, IORESOURCE_MEM, 0); |
| hcd->regs = devm_ioremap_resource(&dev->dev, res_mem); |
| if (IS_ERR(hcd->regs)) { |
| err = PTR_ERR(hcd->regs); |
| goto err_power; |
| } |
| hcd->rsrc_start = res_mem->start; |
| hcd->rsrc_len = resource_size(res_mem); |
| |
| err = usb_add_hcd(hcd, irq, IRQF_SHARED); |
| if (err) |
| goto err_power; |
| |
| device_wakeup_enable(hcd->self.controller); |
| |
| platform_set_drvdata(dev, hcd); |
| |
| return err; |
| |
| err_power: |
| if (pdata->power_off) |
| pdata->power_off(dev); |
| err_reset: |
| pm_runtime_disable(&dev->dev); |
| reset_control_assert(priv->resets); |
| err_put_clks: |
| while (--clk >= 0) |
| clk_put(priv->clks[clk]); |
| |
| if (pdata == &ohci_platform_defaults) |
| dev->dev.platform_data = NULL; |
| |
| usb_put_hcd(hcd); |
| |
| return err; |
| } |
| |
| static int ohci_platform_remove(struct platform_device *dev) |
| { |
| struct usb_hcd *hcd = platform_get_drvdata(dev); |
| struct usb_ohci_pdata *pdata = dev_get_platdata(&dev->dev); |
| struct ohci_platform_priv *priv = hcd_to_ohci_priv(hcd); |
| int clk; |
| |
| pm_runtime_get_sync(&dev->dev); |
| usb_remove_hcd(hcd); |
| |
| if (pdata->power_off) |
| pdata->power_off(dev); |
| |
| reset_control_assert(priv->resets); |
| |
| for (clk = 0; clk < OHCI_MAX_CLKS && priv->clks[clk]; clk++) |
| clk_put(priv->clks[clk]); |
| |
| usb_put_hcd(hcd); |
| |
| pm_runtime_put_sync(&dev->dev); |
| pm_runtime_disable(&dev->dev); |
| |
| if (pdata == &ohci_platform_defaults) |
| dev->dev.platform_data = NULL; |
| |
| return 0; |
| } |
| |
| #ifdef CONFIG_PM_SLEEP |
| static int ohci_platform_suspend(struct device *dev) |
| { |
| struct usb_hcd *hcd = dev_get_drvdata(dev); |
| struct usb_ohci_pdata *pdata = dev->platform_data; |
| struct platform_device *pdev = to_platform_device(dev); |
| bool do_wakeup = device_may_wakeup(dev); |
| int ret; |
| |
| ret = ohci_suspend(hcd, do_wakeup); |
| if (ret) |
| return ret; |
| |
| if (pdata->power_suspend) |
| pdata->power_suspend(pdev); |
| |
| return ret; |
| } |
| |
| static int ohci_platform_resume(struct device *dev) |
| { |
| struct usb_hcd *hcd = dev_get_drvdata(dev); |
| struct usb_ohci_pdata *pdata = dev_get_platdata(dev); |
| struct platform_device *pdev = to_platform_device(dev); |
| |
| if (pdata->power_on) { |
| int err = pdata->power_on(pdev); |
| if (err < 0) |
| return err; |
| } |
| |
| ohci_resume(hcd, false); |
| return 0; |
| } |
| #endif /* CONFIG_PM_SLEEP */ |
| |
| static const struct of_device_id ohci_platform_ids[] = { |
| { .compatible = "generic-ohci", }, |
| { .compatible = "cavium,octeon-6335-ohci", }, |
| { .compatible = "ti,ohci-omap3", }, |
| { } |
| }; |
| MODULE_DEVICE_TABLE(of, ohci_platform_ids); |
| |
| static const struct platform_device_id ohci_platform_table[] = { |
| { "ohci-platform", 0 }, |
| { } |
| }; |
| MODULE_DEVICE_TABLE(platform, ohci_platform_table); |
| |
| static SIMPLE_DEV_PM_OPS(ohci_platform_pm_ops, ohci_platform_suspend, |
| ohci_platform_resume); |
| |
| static struct platform_driver ohci_platform_driver = { |
| .id_table = ohci_platform_table, |
| .probe = ohci_platform_probe, |
| .remove = ohci_platform_remove, |
| .shutdown = usb_hcd_platform_shutdown, |
| .driver = { |
| .name = "ohci-platform", |
| .pm = &ohci_platform_pm_ops, |
| .of_match_table = ohci_platform_ids, |
| } |
| }; |
| |
| static int __init ohci_platform_init(void) |
| { |
| if (usb_disabled()) |
| return -ENODEV; |
| |
| pr_info("%s: " DRIVER_DESC "\n", hcd_name); |
| |
| ohci_init_driver(&ohci_platform_hc_driver, &platform_overrides); |
| return platform_driver_register(&ohci_platform_driver); |
| } |
| module_init(ohci_platform_init); |
| |
| static void __exit ohci_platform_cleanup(void) |
| { |
| platform_driver_unregister(&ohci_platform_driver); |
| } |
| module_exit(ohci_platform_cleanup); |
| |
| MODULE_DESCRIPTION(DRIVER_DESC); |
| MODULE_AUTHOR("Hauke Mehrtens"); |
| MODULE_AUTHOR("Alan Stern"); |
| MODULE_LICENSE("GPL"); |
