ehci-exynos.rar_usb host ehci

/* * SAMSUNG EXYNOS USB HOST EHCI Controller * * Copyright (C) 2011 Samsung Electronics Co.Ltd * Author: Jingoo Han <jg1.han@samsung.com> * Author: Joonyoung Shim <jy0922.shim@samsung.com> * * 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 <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/of_gpio.h> #include <linux/phy/phy.h> #include <linux/platform_device.h> #include <linux/usb.h> #include <linux/usb/hcd.h> #include "ehci.h" #define DRIVER_DESC "EHCI EXYNOS driver" #define EHCI_INSNREG00(base) (base + 0x90) #define EHCI_INSNREG00_ENA_INCR16 (0x1 << 25) #define EHCI_INSNREG00_ENA_INCR8 (0x1 << 24) #define EHCI_INSNREG00_ENA_INCR4 (0x1 << 23) #define EHCI_INSNREG00_ENA_INCRX_ALIGN (0x1 << 22) #define EHCI_INSNREG00_ENABLE_DMA_BURST \ (EHCI_INSNREG00_ENA_INCR16 | EHCI_INSNREG00_ENA_INCR8 | \ EHCI_INSNREG00_ENA_INCR4 | EHCI_INSNREG00_ENA_INCRX_ALIGN) static const char hcd_name[] = "ehci-exynos"; static struct hc_driver __read_mostly exynos_ehci_hc_driver; #define PHY_NUMBER 3 struct exynos_ehci_hcd { struct clk *clk; struct phy *phy[PHY_NUMBER]; }; #define to_exynos_ehci(hcd) (struct exynos_ehci_hcd *)(hcd_to_ehci(hcd)->priv) static int exynos_ehci_get_phy(struct device *dev, struct exynos_ehci_hcd *exynos_ehci) { 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_ehci->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_ehci_phy_enable(struct device *dev) { struct usb_hcd *hcd = dev_get_drvdata(dev); struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd); int i; int ret = 0; for (i = 0; ret == 0 && i < PHY_NUMBER; i++) if (!IS_ERR(exynos_ehci->phy[i])) ret = phy_power_on(exynos_ehci->phy[i]); if (ret) for (i--; i >= 0; i--) if (!IS_ERR(exynos_ehci->phy[i])) phy_power_off(exynos_ehci->phy[i]); return ret; } static void exynos_ehci_phy_disable(struct device *dev) { struct usb_hcd *hcd = dev_get_drvdata(dev); struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd); int i; for (i = 0; i < PHY_NUMBER; i++) if (!IS_ERR(exynos_ehci->phy[i])) phy_power_off(exynos_ehci->phy[i]); } static void exynos_setup_vbus_gpio(struct device *dev) { int err; int gpio; if (!dev->of_node) return; gpio = of_get_named_gpio(dev->of_node, "samsung,vbus-gpio", 0); if (!gpio_is_valid(gpio)) return; err = devm_gpio_request_one(dev, gpio, GPIOF_OUT_INIT_HIGH, "ehci_vbus_gpio"); if (err) dev_err(dev, "can't request ehci vbus gpio %d", gpio); } static int exynos_ehci_probe(struct platform_device *pdev) { struct exynos_ehci_hcd *exynos_ehci; struct usb_hcd *hcd; struct ehci_hcd *ehci; 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; exynos_setup_vbus_gpio(&pdev->dev); hcd = usb_create_hcd(&exynos_ehci_hc_driver, &pdev->dev, dev_name(&pdev->dev)); if (!hcd) { dev_err(&pdev->dev, "Unable to create HCD\n"); return -ENOMEM; } exynos_ehci = to_exynos_ehci(hcd); if (of_device_is_compatible(pdev->dev.of_node, "samsung,exynos5440-ehci")) goto skip_phy; err = exynos_ehci_get_phy(&pdev->dev, exynos_ehci); if (err) goto fail_clk; skip_phy: exynos_ehci->clk = devm_clk_get(&pdev->dev, "usbhost"); if (IS_ERR(exynos_ehci->clk)) { dev_err(&pdev->dev, "Failed to get usbhost clock\n"); err = PTR_ERR(exynos_ehci->clk); goto fail_clk; } err = clk_prepare_enable(exynos_ehci->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; } err = exynos_ehci_phy_enable(&pdev->dev); if (err) { dev_err(&pdev->dev, "Failed to enable USB phy\n"); goto fail_io; } ehci = hcd_to_ehci(hcd); ehci->caps = hcd->regs; /* DMA burst Enable */ writel(EHCI_INSNREG00_ENABLE_DMA_BURST, EHCI_INSNREG00(hcd->regs)); 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); platform_set_drvdata(pdev, hcd); return 0; fail_add_hcd: exynos_ehci_phy_disable(&pdev->dev); fail_io: clk_disable_unprepare(exynos_ehci->clk); fail_clk: usb_put_hcd(hcd); return err; } static int exynos_ehci_remove(struct platform_device *pdev) { struct usb_hcd *hcd = platform_get_drvdata(pdev); struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd); usb_remove_hcd(hcd); exynos_ehci_phy_disable(&pdev->dev); clk_disable_unprepare(exynos_ehci->clk); usb_put_hcd(hcd); return 0; } #ifdef CONFIG_PM static int exynos_ehci_suspend(struct device *dev) { struct usb_hcd *hcd = dev_get_drvdata(dev); struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd); bool do_wakeup = device_may_wakeup(dev); int rc; rc = ehci_suspend(hcd, do_wakeup); if (rc) return rc; exynos_ehci_phy_disable(dev); clk_disable_unprepare(exynos_ehci->clk); return rc; } static int exynos_ehci_resume(struct device *dev) { struct usb_hcd *hcd = dev_get_drvdata(dev); struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd); int ret; clk_prepare_enable(exynos_ehci->clk); ret = exynos_ehci_phy_enable(dev); if (ret) { dev_err(dev, "Failed to enable USB phy\n"); clk_disable_unprepare(exynos_ehci->clk); return ret; } /* DMA burst Enable */ writel(EHCI_INSNREG00_ENABLE_DMA_BURST, EHCI_INSNREG00(hcd->regs)); ehci_resume(hcd, false); return 0; } #else #define exynos_ehci_suspend NULL #define exynos_ehci_resume NULL #endif static const struct dev_pm_ops exynos_ehci_pm_ops = { .suspend = exynos_ehci_suspend, .resume = exynos_ehci_resume, }; #ifdef CONFIG_OF static const struct of_device_id exynos_ehci_match[] = { { .compatible = "samsung,exynos4210-ehci" }, { .compatible = "samsung,exynos5440-ehci" }, {}, }; MODULE_DEVICE_TABLE(of, exynos_ehci_match); #endif static struct platform_driver exynos_ehci_driver = { .probe = exynos_ehci_probe, .remove = exynos_ehci_remove, .shutdown = usb_hcd_platform_shutdown, .driver = { .name = "exynos-ehci", .pm = &exynos_ehci_pm_ops, .of_match_table = of_match_ptr(exynos_ehci_match), } }; static const struct ehci_driver_overrides exynos_overrides __initdata = { .extra_priv_size = sizeof(struct exynos_ehci_hcd), }; static int __init ehci_exynos_init(void) { if (usb_disabled()) return -ENODEV; pr_info("%s: " DRIVER_DESC "\n", hcd_name); ehci_init_driver(&exynos_ehci_hc_driver, &exynos_overrides); return platform_driver_register(&exynos_ehci_driver); } module_init(ehci_exynos_init); stat