/* * Driver for EHCI UHP on Atmel chips * * Copyright (C) 2009 Atmel Corporation, * Nicolas Ferre <nicolas.ferre@atmel.com> * * Based on various ehci-*.c drivers * * This file is subject to the terms and conditions of the GNU General Public * License. See the file COPYING in the main directory of this archive for * more details. */ #include <linux/clk.h> #include <linux/platform_device.h> /* interface and function clocks */ static struct clk *iclk, *fclk; static int clocked; /*-------------------------------------------------------------------------*/ static void atmel_start_clock(void) { clk_enable(iclk); clk_enable(fclk); clocked = 1; } static void atmel_stop_clock(void) { clk_disable(fclk); clk_disable(iclk); clocked = 0; } static void atmel_start_ehci(struct platform_device *pdev) { dev_dbg(&pdev->dev, "start\n"); atmel_start_clock(); } static void atmel_stop_ehci(struct platform_device *pdev) { dev_dbg(&pdev->dev, "stop\n"); atmel_stop_clock(); } /*-------------------------------------------------------------------------*/ static int ehci_atmel_setup(struct usb_hcd *hcd) { struct ehci_hcd *ehci = hcd_to_ehci(hcd); int retval = 0; /* registers start at offset 0x0 */ ehci->caps = hcd->regs; ehci->regs = hcd->regs + HC_LENGTH(ehci_readl(ehci, &ehci->caps->hc_capbase)); dbg_hcs_params(ehci, "reset"); dbg_hcc_params(ehci, "reset"); /* cache this readonly data; minimize chip reads */ ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params); retval = ehci_halt(ehci); if (retval) return retval; /* data structure init */ retval = ehci_init(hcd); if (retval) return retval; ehci->sbrn = 0x20; ehci_reset(ehci); ehci_port_power(ehci, 0); return retval; } static const struct hc_driver ehci_atmel_hc_driver = { .description = hcd_name, .product_desc = "Atmel EHCI UHP HS", .hcd_priv_size = sizeof(struct ehci_hcd), /* generic hardware linkage */ .irq = ehci_irq, .flags = HCD_MEMORY | HCD_USB2, /* basic lifecycle operations */ .reset = ehci_atmel_setup, .start = ehci_run, .stop = ehci_stop, .shutdown = ehci_shutdown, /* managing i/o requests and associated device resources */ .urb_enqueue = ehci_urb_enqueue, .urb_dequeue = ehci_urb_dequeue, .endpoint_disable = ehci_endpoint_disable, /* scheduling support */ .get_frame_number = ehci_get_frame, /* root hub support */ .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, }; static int __init ehci_atmel_drv_probe(struct platform_device *pdev) { struct usb_hcd *hcd; const struct hc_driver *driver = &ehci_atmel_hc_driver; struct resource *res; int irq; int retval; if (usb_disabled()) return -ENODEV; pr_debug("Initializing Atmel-SoC USB Host Controller\n"); irq = platform_get_irq(pdev, 0); if (irq <= 0) { dev_err(&pdev->dev, "Found HC with no IRQ. Check %s setup!\n", dev_name(&pdev->dev)); retval = -ENODEV; goto fail_create_hcd; } hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev)); if (!hcd) { retval = -ENOMEM; goto fail_create_hcd; } res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!res) { dev_err(&pdev->dev, "Found HC with no register addr. Check %s setup!\n", dev_name(&pdev->dev)); retval = -ENODEV; goto fail_request_resource; } hcd->rsrc_start = res->start; hcd->rsrc_len = res->end - res->start + 1; if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, driver->description)) { dev_dbg(&pdev->dev, "controller already in use\n"); retval = -EBUSY; goto fail_request_resource; } hcd->regs = ioremap_nocache(hcd->rsrc_start, hcd->rsrc_len); if (hcd->regs == NULL) { dev_dbg(&pdev->dev, "error mapping memory\n"); retval = -EFAULT; goto fail_ioremap; } iclk = clk_get(&pdev->dev, "ehci_clk"); if (IS_ERR(iclk)) { dev_err(&pdev->dev, "Error getting interface clock\n"); retval = -ENOENT; goto fail_get_iclk; } fclk = clk_get(&pdev->dev, "uhpck"); if (IS_ERR(fclk)) { dev_err(&pdev->dev, "Error getting function clock\n"); retval = -ENOENT; goto fail_get_fclk; } atmel_start_ehci(pdev); retval = usb_add_hcd(hcd, irq, IRQF_SHARED); if (retval) goto fail_add_hcd; return retval; fail_add_hcd: atmel_stop_ehci(pdev); clk_put(fclk); fail_get_fclk: clk_put(iclk); fail_get_iclk: iounmap(hcd->regs); fail_ioremap: release_mem_region(hcd->rsrc_start, hcd->rsrc_len); fail_request_resource: usb_put_hcd(hcd); fail_create_hcd: dev_err(&pdev->dev, "init %s fail, %d\n", dev_name(&pdev->dev), retval); return retval; } static int __exit ehci_atmel_drv_remove(struct platform_device *pdev) { struct usb_hcd *hcd = platform_get_drvdata(pdev); ehci_shutdown(hcd); usb_remove_hcd(hcd); iounmap(hcd->regs); release_mem_region(hcd->rsrc_start, hcd->rsrc_len); usb_put_hcd(hcd); atmel_stop_ehci(pdev); clk_put(fclk); clk_put(iclk); fclk = iclk = NULL; return 0; } static struct platform_driver ehci_atmel_driver = { .probe = ehci_atmel_drv_probe, .remove = __exit_p(ehci_atmel_drv_remove), .shutdown = usb_hcd_platform_shutdown, .driver.name = "atmel-ehci", };