diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/usb/host/ohci-exynos.c | 327 |
1 files changed, 327 insertions, 0 deletions
diff --git a/drivers/usb/host/ohci-exynos.c b/drivers/usb/host/ohci-exynos.c new file mode 100644 index 000000000..5f5e8a64c --- /dev/null +++ b/drivers/usb/host/ohci-exynos.c @@ -0,0 +1,327 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * SAMSUNG EXYNOS USB HOST OHCI Controller + * + * Copyright (C) 2011 Samsung Electronics Co.Ltd + * Author: Jingoo Han <jg1.han@samsung.com> + */ + +#include <linux/clk.h> +#include <linux/dma-mapping.h> +#include <linux/io.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/phy/phy.h> +#include <linux/usb.h> +#include <linux/usb/hcd.h> + +#include "ohci.h" + +#define DRIVER_DESC "OHCI Exynos driver" + +static const char hcd_name[] = "ohci-exynos"; +static struct hc_driver __read_mostly exynos_ohci_hc_driver; + +#define to_exynos_ohci(hcd) (struct exynos_ohci_hcd *)(hcd_to_ohci(hcd)->priv) + +#define PHY_NUMBER 3 + +struct exynos_ohci_hcd { + struct clk *clk; + struct device_node *of_node; + struct phy *phy[PHY_NUMBER]; + bool legacy_phy; +}; + +static int exynos_ohci_get_phy(struct device *dev, + struct exynos_ohci_hcd *exynos_ohci) +{ + struct device_node *child; + struct phy *phy; + int phy_number, num_phys; + int ret; + + /* Get PHYs for the controller */ + num_phys = of_count_phandle_with_args(dev->of_node, "phys", + "#phy-cells"); + for (phy_number = 0; phy_number < num_phys; phy_number++) { + phy = devm_of_phy_get_by_index(dev, dev->of_node, phy_number); + if (IS_ERR(phy)) + return PTR_ERR(phy); + exynos_ohci->phy[phy_number] = phy; + } + if (num_phys > 0) + return 0; + + /* Get PHYs using legacy bindings */ + for_each_available_child_of_node(dev->of_node, child) { + ret = of_property_read_u32(child, "reg", &phy_number); + if (ret) { + dev_err(dev, "Failed to parse device tree\n"); + of_node_put(child); + return ret; + } + + if (phy_number >= PHY_NUMBER) { + dev_err(dev, "Invalid number of PHYs\n"); + of_node_put(child); + return -EINVAL; + } + + phy = devm_of_phy_get(dev, child, NULL); + exynos_ohci->phy[phy_number] = phy; + if (IS_ERR(phy)) { + ret = PTR_ERR(phy); + if (ret == -EPROBE_DEFER) { + of_node_put(child); + return ret; + } else if (ret != -ENOSYS && ret != -ENODEV) { + dev_err(dev, + "Error retrieving usb2 phy: %d\n", ret); + of_node_put(child); + return ret; + } + } + } + + exynos_ohci->legacy_phy = true; + return 0; +} + +static int exynos_ohci_phy_enable(struct device *dev) +{ + struct usb_hcd *hcd = dev_get_drvdata(dev); + struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd); + int i; + int ret = 0; + + for (i = 0; ret == 0 && i < PHY_NUMBER; i++) + if (!IS_ERR(exynos_ohci->phy[i])) + ret = phy_power_on(exynos_ohci->phy[i]); + if (ret) + for (i--; i >= 0; i--) + if (!IS_ERR(exynos_ohci->phy[i])) + phy_power_off(exynos_ohci->phy[i]); + + return ret; +} + +static void exynos_ohci_phy_disable(struct device *dev) +{ + struct usb_hcd *hcd = dev_get_drvdata(dev); + struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd); + int i; + + for (i = 0; i < PHY_NUMBER; i++) + if (!IS_ERR(exynos_ohci->phy[i])) + phy_power_off(exynos_ohci->phy[i]); +} + +static int exynos_ohci_probe(struct platform_device *pdev) +{ + struct exynos_ohci_hcd *exynos_ohci; + struct usb_hcd *hcd; + struct resource *res; + int irq; + int err; + + /* + * Right now device-tree probed devices don't get dma_mask set. + * Since shared usb code relies on it, set it here for now. + * Once we move to full device tree support this will vanish off. + */ + err = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32)); + if (err) + return err; + + hcd = usb_create_hcd(&exynos_ohci_hc_driver, + &pdev->dev, dev_name(&pdev->dev)); + if (!hcd) { + dev_err(&pdev->dev, "Unable to create HCD\n"); + return -ENOMEM; + } + + exynos_ohci = to_exynos_ohci(hcd); + + err = exynos_ohci_get_phy(&pdev->dev, exynos_ohci); + if (err) + goto fail_clk; + + exynos_ohci->clk = devm_clk_get(&pdev->dev, "usbhost"); + + if (IS_ERR(exynos_ohci->clk)) { + dev_err(&pdev->dev, "Failed to get usbhost clock\n"); + err = PTR_ERR(exynos_ohci->clk); + goto fail_clk; + } + + err = clk_prepare_enable(exynos_ohci->clk); + if (err) + goto fail_clk; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + hcd->regs = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(hcd->regs)) { + err = PTR_ERR(hcd->regs); + goto fail_io; + } + hcd->rsrc_start = res->start; + hcd->rsrc_len = resource_size(res); + + irq = platform_get_irq(pdev, 0); + if (irq < 0) { + err = irq; + goto fail_io; + } + + platform_set_drvdata(pdev, hcd); + + err = exynos_ohci_phy_enable(&pdev->dev); + if (err) { + dev_err(&pdev->dev, "Failed to enable USB phy\n"); + goto fail_io; + } + + /* + * Workaround: reset of_node pointer to avoid conflict between legacy + * Exynos OHCI port subnodes and generic USB device bindings + */ + exynos_ohci->of_node = pdev->dev.of_node; + if (exynos_ohci->legacy_phy) + pdev->dev.of_node = NULL; + + err = usb_add_hcd(hcd, irq, IRQF_SHARED); + if (err) { + dev_err(&pdev->dev, "Failed to add USB HCD\n"); + goto fail_add_hcd; + } + device_wakeup_enable(hcd->self.controller); + return 0; + +fail_add_hcd: + exynos_ohci_phy_disable(&pdev->dev); + pdev->dev.of_node = exynos_ohci->of_node; +fail_io: + clk_disable_unprepare(exynos_ohci->clk); +fail_clk: + usb_put_hcd(hcd); + return err; +} + +static int exynos_ohci_remove(struct platform_device *pdev) +{ + struct usb_hcd *hcd = platform_get_drvdata(pdev); + struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd); + + pdev->dev.of_node = exynos_ohci->of_node; + + usb_remove_hcd(hcd); + + exynos_ohci_phy_disable(&pdev->dev); + + clk_disable_unprepare(exynos_ohci->clk); + + usb_put_hcd(hcd); + + return 0; +} + +static void exynos_ohci_shutdown(struct platform_device *pdev) +{ + struct usb_hcd *hcd = platform_get_drvdata(pdev); + + if (hcd->driver->shutdown) + hcd->driver->shutdown(hcd); +} + +#ifdef CONFIG_PM +static int exynos_ohci_suspend(struct device *dev) +{ + struct usb_hcd *hcd = dev_get_drvdata(dev); + struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd); + bool do_wakeup = device_may_wakeup(dev); + int rc = ohci_suspend(hcd, do_wakeup); + + if (rc) + return rc; + + exynos_ohci_phy_disable(dev); + + clk_disable_unprepare(exynos_ohci->clk); + + return 0; +} + +static int exynos_ohci_resume(struct device *dev) +{ + struct usb_hcd *hcd = dev_get_drvdata(dev); + struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd); + int ret; + + clk_prepare_enable(exynos_ohci->clk); + + ret = exynos_ohci_phy_enable(dev); + if (ret) { + dev_err(dev, "Failed to enable USB phy\n"); + clk_disable_unprepare(exynos_ohci->clk); + return ret; + } + + ohci_resume(hcd, false); + + return 0; +} +#else +#define exynos_ohci_suspend NULL +#define exynos_ohci_resume NULL +#endif + +static const struct ohci_driver_overrides exynos_overrides __initconst = { + .extra_priv_size = sizeof(struct exynos_ohci_hcd), +}; + +static const struct dev_pm_ops exynos_ohci_pm_ops = { + .suspend = exynos_ohci_suspend, + .resume = exynos_ohci_resume, +}; + +#ifdef CONFIG_OF +static const struct of_device_id exynos_ohci_match[] = { + { .compatible = "samsung,exynos4210-ohci" }, + {}, +}; +MODULE_DEVICE_TABLE(of, exynos_ohci_match); +#endif + +static struct platform_driver exynos_ohci_driver = { + .probe = exynos_ohci_probe, + .remove = exynos_ohci_remove, + .shutdown = exynos_ohci_shutdown, + .driver = { + .name = "exynos-ohci", + .pm = &exynos_ohci_pm_ops, + .of_match_table = of_match_ptr(exynos_ohci_match), + } +}; +static int __init ohci_exynos_init(void) +{ + if (usb_disabled()) + return -ENODEV; + + pr_info("%s: " DRIVER_DESC "\n", hcd_name); + ohci_init_driver(&exynos_ohci_hc_driver, &exynos_overrides); + return platform_driver_register(&exynos_ohci_driver); +} +module_init(ohci_exynos_init); + +static void __exit ohci_exynos_cleanup(void) +{ + platform_driver_unregister(&exynos_ohci_driver); +} +module_exit(ohci_exynos_cleanup); + +MODULE_ALIAS("platform:exynos-ohci"); +MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>"); +MODULE_LICENSE("GPL v2"); |