| /* |
| * OHCI HCD (Host Controller Driver) for USB. |
| * |
| * Copyright (C) 2010 ST Microelectronics. |
| * Deepak Sikri<deepak.sikri@st.com> |
| * |
| * Based on various ohci-*.c drivers |
| * |
| * This file is licensed under the terms of the GNU General Public |
| * License version 2. This program is licensed "as is" without any |
| * warranty of any kind, whether express or implied. |
| */ |
| |
| #include <linux/signal.h> |
| #include <linux/platform_device.h> |
| #include <linux/clk.h> |
| #include <linux/of.h> |
| |
| struct spear_ohci { |
| struct ohci_hcd ohci; |
| struct clk *clk; |
| }; |
| |
| #define to_spear_ohci(hcd) (struct spear_ohci *)hcd_to_ohci(hcd) |
| |
| static void spear_start_ohci(struct spear_ohci *ohci) |
| { |
| clk_enable(ohci->clk); |
| } |
| |
| static void spear_stop_ohci(struct spear_ohci *ohci) |
| { |
| clk_disable(ohci->clk); |
| } |
| |
| static int __devinit ohci_spear_start(struct usb_hcd *hcd) |
| { |
| struct ohci_hcd *ohci = hcd_to_ohci(hcd); |
| int ret; |
| |
| ret = ohci_init(ohci); |
| if (ret < 0) |
| return ret; |
| ohci->regs = hcd->regs; |
| |
| ret = ohci_run(ohci); |
| if (ret < 0) { |
| dev_err(hcd->self.controller, "can't start\n"); |
| ohci_stop(hcd); |
| return ret; |
| } |
| |
| create_debug_files(ohci); |
| |
| #ifdef DEBUG |
| ohci_dump(ohci, 1); |
| #endif |
| return 0; |
| } |
| |
| static const struct hc_driver ohci_spear_hc_driver = { |
| .description = hcd_name, |
| .product_desc = "SPEAr OHCI", |
| .hcd_priv_size = sizeof(struct spear_ohci), |
| |
| /* generic hardware linkage */ |
| .irq = ohci_irq, |
| .flags = HCD_USB11 | HCD_MEMORY, |
| |
| /* basic lifecycle operations */ |
| .start = ohci_spear_start, |
| .stop = ohci_stop, |
| .shutdown = ohci_shutdown, |
| #ifdef CONFIG_PM |
| .bus_suspend = ohci_bus_suspend, |
| .bus_resume = ohci_bus_resume, |
| #endif |
| |
| /* managing i/o requests and associated device resources */ |
| .urb_enqueue = ohci_urb_enqueue, |
| .urb_dequeue = ohci_urb_dequeue, |
| .endpoint_disable = ohci_endpoint_disable, |
| |
| /* scheduling support */ |
| .get_frame_number = ohci_get_frame, |
| |
| /* root hub support */ |
| .hub_status_data = ohci_hub_status_data, |
| .hub_control = ohci_hub_control, |
| |
| .start_port_reset = ohci_start_port_reset, |
| }; |
| |
| static u64 spear_ohci_dma_mask = DMA_BIT_MASK(32); |
| |
| static int spear_ohci_hcd_drv_probe(struct platform_device *pdev) |
| { |
| const struct hc_driver *driver = &ohci_spear_hc_driver; |
| struct usb_hcd *hcd = NULL; |
| struct clk *usbh_clk; |
| struct spear_ohci *ohci_p; |
| struct resource *res; |
| int retval, irq; |
| char clk_name[20] = "usbh_clk"; |
| static int instance = -1; |
| |
| irq = platform_get_irq(pdev, 0); |
| if (irq < 0) { |
| retval = irq; |
| goto fail_irq_get; |
| } |
| |
| /* |
| * 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 have dma capability bindings this can go away. |
| */ |
| if (!pdev->dev.dma_mask) |
| pdev->dev.dma_mask = &spear_ohci_dma_mask; |
| |
| /* |
| * Increment the device instance, when probing via device-tree |
| */ |
| if (pdev->id < 0) |
| instance++; |
| else |
| instance = pdev->id; |
| sprintf(clk_name, "usbh.%01d_clk", instance); |
| |
| 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 = pdev->resource[0].start; |
| hcd->rsrc_len = resource_size(res); |
| if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) { |
| dev_dbg(&pdev->dev, "request_mem_region failed\n"); |
| retval = -EBUSY; |
| goto fail_request_resource; |
| } |
| |
| hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len); |
| if (!hcd->regs) { |
| dev_dbg(&pdev->dev, "ioremap failed\n"); |
| retval = -ENOMEM; |
| goto fail_ioremap; |
| } |
| |
| ohci_p = (struct spear_ohci *)hcd_to_ohci(hcd); |
| ohci_p->clk = usbh_clk; |
| spear_start_ohci(ohci_p); |
| ohci_hcd_init(hcd_to_ohci(hcd)); |
| |
| retval = usb_add_hcd(hcd, platform_get_irq(pdev, 0), 0); |
| if (retval == 0) |
| return retval; |
| |
| spear_stop_ohci(ohci_p); |
| 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_ohci_hcd_drv_remove(struct platform_device *pdev) |
| { |
| struct usb_hcd *hcd = platform_get_drvdata(pdev); |
| struct spear_ohci *ohci_p = to_spear_ohci(hcd); |
| |
| usb_remove_hcd(hcd); |
| if (ohci_p->clk) |
| spear_stop_ohci(ohci_p); |
| |
| iounmap(hcd->regs); |
| release_mem_region(hcd->rsrc_start, hcd->rsrc_len); |
| usb_put_hcd(hcd); |
| |
| if (ohci_p->clk) |
| clk_put(ohci_p->clk); |
| platform_set_drvdata(pdev, NULL); |
| return 0; |
| } |
| |
| #if defined(CONFIG_PM) |
| static int spear_ohci_hcd_drv_suspend(struct platform_device *dev, |
| pm_message_t message) |
| { |
| struct usb_hcd *hcd = platform_get_drvdata(dev); |
| struct ohci_hcd *ohci = hcd_to_ohci(hcd); |
| struct spear_ohci *ohci_p = to_spear_ohci(hcd); |
| |
| if (time_before(jiffies, ohci->next_statechange)) |
| msleep(5); |
| ohci->next_statechange = jiffies; |
| |
| spear_stop_ohci(ohci_p); |
| return 0; |
| } |
| |
| static int spear_ohci_hcd_drv_resume(struct platform_device *dev) |
| { |
| struct usb_hcd *hcd = platform_get_drvdata(dev); |
| struct ohci_hcd *ohci = hcd_to_ohci(hcd); |
| struct spear_ohci *ohci_p = to_spear_ohci(hcd); |
| |
| if (time_before(jiffies, ohci->next_statechange)) |
| msleep(5); |
| ohci->next_statechange = jiffies; |
| |
| spear_start_ohci(ohci_p); |
| ohci_finish_controller_resume(hcd); |
| return 0; |
| } |
| #endif |
| |
| static struct of_device_id spear_ohci_id_table[] __devinitdata = { |
| { .compatible = "st,spear600-ohci", }, |
| { }, |
| }; |
| |
| /* Driver definition to register with the platform bus */ |
| static struct platform_driver spear_ohci_hcd_driver = { |
| .probe = spear_ohci_hcd_drv_probe, |
| .remove = spear_ohci_hcd_drv_remove, |
| #ifdef CONFIG_PM |
| .suspend = spear_ohci_hcd_drv_suspend, |
| .resume = spear_ohci_hcd_drv_resume, |
| #endif |
| .driver = { |
| .owner = THIS_MODULE, |
| .name = "spear-ohci", |
| .of_match_table = of_match_ptr(spear_ohci_id_table), |
| }, |
| }; |
| |
| MODULE_ALIAS("platform:spear-ohci"); |