/* * SAMSUNG S5P USB HOST EHCI Controller * * Copyright (C) 2011 Samsung Electronics Co.Ltd * Author: Jingoo Han * Author: Joonyoung Shim * * 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 #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) struct s5p_ehci_hcd { struct device *dev; struct usb_hcd *hcd; struct clk *clk; }; static const struct hc_driver s5p_ehci_hc_driver = { .description = hcd_name, .product_desc = "S5P EHCI Host Controller", .hcd_priv_size = sizeof(struct ehci_hcd), .irq = ehci_irq, .flags = HCD_MEMORY | HCD_USB2, .reset = ehci_setup, .start = ehci_run, .stop = ehci_stop, .shutdown = ehci_shutdown, .get_frame_number = ehci_get_frame, .urb_enqueue = ehci_urb_enqueue, .urb_dequeue = ehci_urb_dequeue, .endpoint_disable = ehci_endpoint_disable, .endpoint_reset = ehci_endpoint_reset, .hub_status_data = ehci_hub_status_data, .hub_control = ehci_hub_control, .bus_suspend = ehci_bus_suspend, .bus_resume = ehci_bus_resume, .relinquish_port = ehci_relinquish_port, .port_handed_over = ehci_port_handed_over, .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete, }; static void s5p_setup_vbus_gpio(struct platform_device *pdev) { int err; int gpio; if (!pdev->dev.of_node) return; gpio = of_get_named_gpio(pdev->dev.of_node, "samsung,vbus-gpio", 0); if (!gpio_is_valid(gpio)) return; err = gpio_request_one(gpio, GPIOF_OUT_INIT_HIGH, "ehci_vbus_gpio"); if (err) dev_err(&pdev->dev, "can't request ehci vbus gpio %d", gpio); } static u64 ehci_s5p_dma_mask = DMA_BIT_MASK(32); static int __devinit s5p_ehci_probe(struct platform_device *pdev) { struct s5p_ehci_platdata *pdata; struct s5p_ehci_hcd *s5p_ehci; struct usb_hcd *hcd; struct ehci_hcd *ehci; struct resource *res; int irq; int err; pdata = pdev->dev.platform_data; if (!pdata) { dev_err(&pdev->dev, "No platform data defined\n"); return -EINVAL; } /* * 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 = &ehci_s5p_dma_mask; if (!pdev->dev.coherent_dma_mask) pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32); s5p_setup_vbus_gpio(pdev); s5p_ehci = devm_kzalloc(&pdev->dev, sizeof(struct s5p_ehci_hcd), GFP_KERNEL); if (!s5p_ehci) return -ENOMEM; s5p_ehci->dev = &pdev->dev; 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->hcd = hcd; 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_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 (pdata->phy_init) pdata->phy_init(pdev, S5P_USB_PHY_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_io; } platform_set_drvdata(pdev, s5p_ehci); return 0; fail_io: clk_disable(s5p_ehci->clk); fail_clk: usb_put_hcd(hcd); return err; } static int __devexit s5p_ehci_remove(struct platform_device *pdev) { struct s5p_ehci_platdata *pdata = pdev->dev.platform_data; struct s5p_ehci_hcd *s5p_ehci = platform_get_drvdata(pdev); struct usb_hcd *hcd = s5p_ehci->hcd; usb_remove_hcd(hcd); if (pdata && pdata->phy_exit) pdata->phy_exit(pdev, S5P_USB_PHY_HOST); clk_disable(s5p_ehci->clk); usb_put_hcd(hcd); return 0; } static void s5p_ehci_shutdown(struct platform_device *pdev) { struct s5p_ehci_hcd *s5p_ehci = platform_get_drvdata(pdev); struct usb_hcd *hcd = s5p_ehci->hcd; if (hcd->driver->shutdown) hcd->driver->shutdown(hcd); } #ifdef CONFIG_PM static int s5p_ehci_suspend(struct device *dev) { struct s5p_ehci_hcd *s5p_ehci = dev_get_drvdata(dev); struct usb_hcd *hcd = s5p_ehci->hcd; bool do_wakeup = device_may_wakeup(dev); struct platform_device *pdev = to_platform_device(dev); struct s5p_ehci_platdata *pdata = pdev->dev.platform_data; int rc; rc = ehci_suspend(hcd, do_wakeup); if (pdata && pdata->phy_exit) pdata->phy_exit(pdev, S5P_USB_PHY_HOST); clk_disable(s5p_ehci->clk); return rc; } static int s5p_ehci_resume(struct device *dev) { struct s5p_ehci_hcd *s5p_ehci = dev_get_drvdata(dev); struct usb_hcd *hcd = s5p_ehci->hcd; struct platform_device *pdev = to_platform_device(dev); struct s5p_ehci_platdata *pdata = pdev->dev.platform_data; clk_enable(s5p_ehci->clk); if (pdata && pdata->phy_init) pdata->phy_init(pdev, S5P_USB_PHY_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,exynos-ehci" }, {}, }; MODULE_DEVICE_TABLE(of, exynos_ehci_match); #endif static struct platform_driver s5p_ehci_driver = { .probe = s5p_ehci_probe, .remove = __devexit_p(s5p_ehci_remove), .shutdown = s5p_ehci_shutdown, .driver = { .name = "s5p-ehci", .owner = THIS_MODULE, .pm = &s5p_ehci_pm_ops, .of_match_table = of_match_ptr(exynos_ehci_match), } }; MODULE_ALIAS("platform:s5p-ehci");