/* * SAMSUNG EXYNOS USB HOST OHCI Controller * * Copyright (C) 2011 Samsung Electronics Co.Ltd * Author: Jingoo Han * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2 of the License, or (at your * option) any later version. * */ #include #include #include #include #include #include #include #include #include #include #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 phy *phy[PHY_NUMBER]; }; 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; int ret; /* Get PHYs for the controller */ 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) { return ret; } else if (ret != -ENOSYS && ret != -ENODEV) { dev_err(dev, "Error retrieving usb2 phy: %d\n", ret); return ret; } } } 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); if (of_device_is_compatible(pdev->dev.of_node, "samsung,exynos5440-ohci")) goto skip_phy; err = exynos_ohci_get_phy(&pdev->dev, exynos_ohci); if (err) goto fail_clk; skip_phy: 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) { dev_err(&pdev->dev, "Failed to get IRQ\n"); err = -ENODEV; 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; } 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); 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); 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" }, { .compatible = "samsung,exynos5440-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 "); MODULE_LICENSE("GPL v2"); use the BIOS also neglects to provide the ACPI/CPPC table, that Windows requires to enable HWP, and so Windows runs in legacy P-state mode, where this setting has no effect. Linux' intel_pstate driver does not require ACPI/CPPC to enable HWP, and so it runs in HWP mode, exposing this incorrect BIOS configuration. There are several ways to address this problem. First, Linux can also run in legacy P-state mode on this system. As intel_pstate is how Linux enables HWP, booting with "intel_pstate=disable" will run in acpi-cpufreq/ondemand legacy p-state mode. Or second, the "performance" governor can be used with intel_pstate, which will modify HWP.EPP to 0. Or third, starting in 4.10, the /sys/devices/system/cpu/cpufreq/policy*/energy_performance_preference attribute in can be updated from "balance_power" to "performance". Or fourth, apply this patch, which fixes the erroneous setting of MSR_IA32_POWER_CTL BIT_EE on this model, allowing the default configuration to function as designed. Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> Reviewed-by: Len Brown <len.brown@intel.com> Cc: 4.6+ <stable@vger.kernel.org> # 4.6+ Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'sound/soc/txx9/txx9aclc.h')