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