| /* |
| * Driver for EHCI HCD on SPEAR SOC |
| * |
| * Copyright (C) 2010 ST Micro Electronics, |
| * Deepak Sikri <deepak.sikri@st.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/platform_device.h> |
| #include <linux/clk.h> |
| |
| struct spear_ehci { |
| struct ehci_hcd ehci; |
| struct clk *clk; |
| }; |
| |
| #define to_spear_ehci(hcd) (struct spear_ehci *)hcd_to_ehci(hcd) |
| |
| static void spear_start_ehci(struct spear_ehci *ehci) |
| { |
| clk_enable(ehci->clk); |
| } |
| |
| static void spear_stop_ehci(struct spear_ehci *ehci) |
| { |
| clk_disable(ehci->clk); |
| } |
| |
| static int ehci_spear_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, ehci_readl(ehci, |
| &ehci->caps->hc_capbase)); |
| /* 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; |
| |
| retval = ehci_init(hcd); |
| if (retval) |
| return retval; |
| |
| ehci_reset(ehci); |
| ehci_port_power(ehci, 0); |
| |
| return retval; |
| } |
| |
| static const struct hc_driver ehci_spear_hc_driver = { |
| .description = hcd_name, |
| .product_desc = "SPEAr EHCI", |
| .hcd_priv_size = sizeof(struct spear_ehci), |
| |
| /* generic hardware linkage */ |
| .irq = ehci_irq, |
| .flags = HCD_MEMORY | HCD_USB2, |
| |
| /* basic lifecycle operations */ |
| .reset = ehci_spear_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, |
| .endpoint_reset = ehci_endpoint_reset, |
| |
| /* 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, |
| .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete, |
| }; |
| |
| static int spear_ehci_hcd_drv_probe(struct platform_device *pdev) |
| { |
| struct usb_hcd *hcd ; |
| struct spear_ehci *ehci; |
| struct resource *res; |
| struct clk *usbh_clk; |
| const struct hc_driver *driver = &ehci_spear_hc_driver; |
| int *pdata = pdev->dev.platform_data; |
| int irq, retval; |
| char clk_name[20] = "usbh_clk"; |
| |
| if (pdata == NULL) |
| return -EFAULT; |
| |
| if (usb_disabled()) |
| return -ENODEV; |
| |
| irq = platform_get_irq(pdev, 0); |
| if (irq < 0) { |
| retval = irq; |
| goto fail_irq_get; |
| } |
| |
| if (*pdata >= 0) |
| sprintf(clk_name, "usbh.%01d_clk", *pdata); |
| |
| usbh_clk = clk_get(NULL, clk_name); |
| if (IS_ERR(usbh_clk)) { |
| dev_err(&pdev->dev, "Error getting interface clock\n"); |
| retval = PTR_ERR(usbh_clk); |
| goto fail_get_usbh_clk; |
| } |
| |
| 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) { |
| retval = -ENODEV; |
| goto fail_request_resource; |
| } |
| |
| hcd->rsrc_start = res->start; |
| hcd->rsrc_len = resource_size(res); |
| if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, |
| driver->description)) { |
| retval = -EBUSY; |
| goto fail_request_resource; |
| } |
| |
| hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len); |
| if (hcd->regs == NULL) { |
| dev_dbg(&pdev->dev, "error mapping memory\n"); |
| retval = -ENOMEM; |
| goto fail_ioremap; |
| } |
| |
| ehci = (struct spear_ehci *)hcd_to_ehci(hcd); |
| ehci->clk = usbh_clk; |
| |
| spear_start_ehci(ehci); |
| retval = usb_add_hcd(hcd, irq, IRQF_SHARED | IRQF_DISABLED); |
| if (retval) |
| goto fail_add_hcd; |
| |
| return retval; |
| |
| fail_add_hcd: |
| spear_stop_ehci(ehci); |
| iounmap(hcd->regs); |
| fail_ioremap: |
| release_mem_region(hcd->rsrc_start, hcd->rsrc_len); |
| fail_request_resource: |
| usb_put_hcd(hcd); |
| fail_create_hcd: |
| clk_put(usbh_clk); |
| fail_get_usbh_clk: |
| fail_irq_get: |
| dev_err(&pdev->dev, "init fail, %d\n", retval); |
| |
| return retval ; |
| } |
| |
| static int spear_ehci_hcd_drv_remove(struct platform_device *pdev) |
| { |
| struct usb_hcd *hcd = platform_get_drvdata(pdev); |
| struct spear_ehci *ehci_p = to_spear_ehci(hcd); |
| |
| if (!hcd) |
| return 0; |
| if (in_interrupt()) |
| BUG(); |
| usb_remove_hcd(hcd); |
| |
| if (ehci_p->clk) |
| spear_stop_ehci(ehci_p); |
| iounmap(hcd->regs); |
| release_mem_region(hcd->rsrc_start, hcd->rsrc_len); |
| usb_put_hcd(hcd); |
| |
| if (ehci_p->clk) |
| clk_put(ehci_p->clk); |
| |
| return 0; |
| } |
| |
| static struct platform_driver spear_ehci_hcd_driver = { |
| .probe = spear_ehci_hcd_drv_probe, |
| .remove = spear_ehci_hcd_drv_remove, |
| .shutdown = usb_hcd_platform_shutdown, |
| .driver = { |
| .name = "spear-ehci", |
| .bus = &platform_bus_type |
| } |
| }; |
| |
| MODULE_ALIAS("platform:spear-ehci"); |