| /* |
| * SAMSUNG S5P 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/platform_device.h> |
| #include <linux/platform_data/usb-ehci-s5p.h> |
| #include <linux/usb/phy.h> |
| #include <linux/usb/samsung_usb_phy.h> |
| #include <linux/usb.h> |
| #include <linux/usb/hcd.h> |
| #include <linux/usb/otg.h> |
| |
| #include "ehci.h" |
| |
| #define DRIVER_DESC "EHCI s5p 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-s5p"; |
| static struct hc_driver __read_mostly s5p_ehci_hc_driver; |
| |
| struct s5p_ehci_hcd { |
| struct clk *clk; |
| struct usb_phy *phy; |
| struct usb_otg *otg; |
| struct s5p_ehci_platdata *pdata; |
| }; |
| |
| static struct s5p_ehci_platdata empty_platdata; |
| |
| #define to_s5p_ehci(hcd) (struct s5p_ehci_hcd *)(hcd_to_ehci(hcd)->priv) |
| |
| static void s5p_setup_vbus_gpio(struct platform_device *pdev) |
| { |
| struct device *dev = &pdev->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 s5p_ehci_probe(struct platform_device *pdev) |
| { |
| struct s5p_ehci_platdata *pdata = pdev->dev.platform_data; |
| struct s5p_ehci_hcd *s5p_ehci; |
| struct usb_hcd *hcd; |
| struct ehci_hcd *ehci; |
| struct resource *res; |
| struct usb_phy *phy; |
| 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. |
| */ |
| if (!pdev->dev.dma_mask) |
| pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask; |
| if (!pdev->dev.coherent_dma_mask) |
| pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32); |
| |
| s5p_setup_vbus_gpio(pdev); |
| |
| hcd = usb_create_hcd(&s5p_ehci_hc_driver, |
| &pdev->dev, dev_name(&pdev->dev)); |
| if (!hcd) { |
| dev_err(&pdev->dev, "Unable to create HCD\n"); |
| return -ENOMEM; |
| } |
| s5p_ehci = to_s5p_ehci(hcd); |
| |
| if (of_device_is_compatible(pdev->dev.of_node, |
| "samsung,exynos5440-ehci")) { |
| s5p_ehci->pdata = &empty_platdata; |
| goto skip_phy; |
| } |
| |
| phy = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2); |
| if (IS_ERR(phy)) { |
| /* Fallback to pdata */ |
| if (!pdata) { |
| usb_put_hcd(hcd); |
| dev_warn(&pdev->dev, "no platform data or transceiver defined\n"); |
| return -EPROBE_DEFER; |
| } else { |
| s5p_ehci->pdata = pdata; |
| } |
| } else { |
| s5p_ehci->phy = phy; |
| s5p_ehci->otg = phy->otg; |
| } |
| |
| skip_phy: |
| |
| s5p_ehci->clk = devm_clk_get(&pdev->dev, "usbhost"); |
| |
| if (IS_ERR(s5p_ehci->clk)) { |
| dev_err(&pdev->dev, "Failed to get usbhost clock\n"); |
| err = PTR_ERR(s5p_ehci->clk); |
| goto fail_clk; |
| } |
| |
| err = clk_prepare_enable(s5p_ehci->clk); |
| if (err) |
| goto fail_clk; |
| |
| res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| if (!res) { |
| dev_err(&pdev->dev, "Failed to get I/O memory\n"); |
| err = -ENXIO; |
| goto fail_io; |
| } |
| |
| hcd->rsrc_start = res->start; |
| hcd->rsrc_len = resource_size(res); |
| hcd->regs = devm_ioremap(&pdev->dev, res->start, hcd->rsrc_len); |
| if (!hcd->regs) { |
| dev_err(&pdev->dev, "Failed to remap I/O memory\n"); |
| err = -ENOMEM; |
| goto fail_io; |
| } |
| |
| irq = platform_get_irq(pdev, 0); |
| if (!irq) { |
| dev_err(&pdev->dev, "Failed to get IRQ\n"); |
| err = -ENODEV; |
| goto fail_io; |
| } |
| |
| if (s5p_ehci->otg) |
| s5p_ehci->otg->set_host(s5p_ehci->otg, &hcd->self); |
| |
| if (s5p_ehci->phy) |
| usb_phy_init(s5p_ehci->phy); |
| else if (s5p_ehci->pdata->phy_init) |
| s5p_ehci->pdata->phy_init(pdev, USB_PHY_TYPE_HOST); |
| |
| 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; |
| } |
| |
| platform_set_drvdata(pdev, hcd); |
| |
| return 0; |
| |
| fail_add_hcd: |
| if (s5p_ehci->phy) |
| usb_phy_shutdown(s5p_ehci->phy); |
| else if (s5p_ehci->pdata->phy_exit) |
| s5p_ehci->pdata->phy_exit(pdev, USB_PHY_TYPE_HOST); |
| fail_io: |
| clk_disable_unprepare(s5p_ehci->clk); |
| fail_clk: |
| usb_put_hcd(hcd); |
| return err; |
| } |
| |
| static int s5p_ehci_remove(struct platform_device *pdev) |
| { |
| struct usb_hcd *hcd = platform_get_drvdata(pdev); |
| struct s5p_ehci_hcd *s5p_ehci = to_s5p_ehci(hcd); |
| |
| usb_remove_hcd(hcd); |
| |
| if (s5p_ehci->otg) |
| s5p_ehci->otg->set_host(s5p_ehci->otg, &hcd->self); |
| |
| if (s5p_ehci->phy) |
| usb_phy_shutdown(s5p_ehci->phy); |
| else if (s5p_ehci->pdata->phy_exit) |
| s5p_ehci->pdata->phy_exit(pdev, USB_PHY_TYPE_HOST); |
| |
| clk_disable_unprepare(s5p_ehci->clk); |
| |
| usb_put_hcd(hcd); |
| |
| return 0; |
| } |
| |
| #ifdef CONFIG_PM |
| static int s5p_ehci_suspend(struct device *dev) |
| { |
| struct usb_hcd *hcd = dev_get_drvdata(dev); |
| struct s5p_ehci_hcd *s5p_ehci = to_s5p_ehci(hcd); |
| struct platform_device *pdev = to_platform_device(dev); |
| |
| bool do_wakeup = device_may_wakeup(dev); |
| int rc; |
| |
| rc = ehci_suspend(hcd, do_wakeup); |
| |
| if (s5p_ehci->otg) |
| s5p_ehci->otg->set_host(s5p_ehci->otg, &hcd->self); |
| |
| if (s5p_ehci->phy) |
| usb_phy_shutdown(s5p_ehci->phy); |
| else if (s5p_ehci->pdata->phy_exit) |
| s5p_ehci->pdata->phy_exit(pdev, USB_PHY_TYPE_HOST); |
| |
| clk_disable_unprepare(s5p_ehci->clk); |
| |
| return rc; |
| } |
| |
| static int s5p_ehci_resume(struct device *dev) |
| { |
| struct usb_hcd *hcd = dev_get_drvdata(dev); |
| struct s5p_ehci_hcd *s5p_ehci = to_s5p_ehci(hcd); |
| struct platform_device *pdev = to_platform_device(dev); |
| |
| clk_prepare_enable(s5p_ehci->clk); |
| |
| if (s5p_ehci->otg) |
| s5p_ehci->otg->set_host(s5p_ehci->otg, &hcd->self); |
| |
| if (s5p_ehci->phy) |
| usb_phy_init(s5p_ehci->phy); |
| else if (s5p_ehci->pdata->phy_init) |
| s5p_ehci->pdata->phy_init(pdev, USB_PHY_TYPE_HOST); |
| |
| /* DMA burst Enable */ |
| writel(EHCI_INSNREG00_ENABLE_DMA_BURST, EHCI_INSNREG00(hcd->regs)); |
| |
| ehci_resume(hcd, false); |
| return 0; |
| } |
| #else |
| #define s5p_ehci_suspend NULL |
| #define s5p_ehci_resume NULL |
| #endif |
| |
| static const struct dev_pm_ops s5p_ehci_pm_ops = { |
| .suspend = s5p_ehci_suspend, |
| .resume = s5p_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 s5p_ehci_driver = { |
| .probe = s5p_ehci_probe, |
| .remove = s5p_ehci_remove, |
| .shutdown = usb_hcd_platform_shutdown, |
| .driver = { |
| .name = "s5p-ehci", |
| .owner = THIS_MODULE, |
| .pm = &s5p_ehci_pm_ops, |
| .of_match_table = of_match_ptr(exynos_ehci_match), |
| } |
| }; |
| static const struct ehci_driver_overrides s5p_overrides __initdata = { |
| .extra_priv_size = sizeof(struct s5p_ehci_hcd), |
| }; |
| |
| static int __init ehci_s5p_init(void) |
| { |
| if (usb_disabled()) |
| return -ENODEV; |
| |
| pr_info("%s: " DRIVER_DESC "\n", hcd_name); |
| ehci_init_driver(&s5p_ehci_hc_driver, &s5p_overrides); |
| return platform_driver_register(&s5p_ehci_driver); |
| } |
| module_init(ehci_s5p_init); |
| |
| static void __exit ehci_s5p_cleanup(void) |
| { |
| platform_driver_unregister(&s5p_ehci_driver); |
| } |
| module_exit(ehci_s5p_cleanup); |
| |
| MODULE_DESCRIPTION(DRIVER_DESC); |
| MODULE_ALIAS("platform:s5p-ehci"); |
| MODULE_AUTHOR("Jingoo Han"); |
| MODULE_AUTHOR("Joonyoung Shim"); |
| MODULE_LICENSE("GPL v2"); |