| /* |
| * 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/clk.h> |
| #include <linux/dma-mapping.h> |
| #include <linux/io.h> |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/of.h> |
| #include <linux/platform_device.h> |
| #include <linux/signal.h> |
| #include <linux/usb.h> |
| #include <linux/usb/hcd.h> |
| |
| #include "ohci.h" |
| |
| #define DRIVER_DESC "OHCI SPEAr driver" |
| |
| static const char hcd_name[] = "SPEAr-ohci"; |
| struct spear_ohci { |
| struct clk *clk; |
| }; |
| |
| #define to_spear_ohci(hcd) (struct spear_ohci *)(hcd_to_ohci(hcd)->priv) |
| |
| static struct hc_driver __read_mostly ohci_spear_hc_driver; |
| |
| static int spear_ohci_hcd_drv_probe(struct platform_device *pdev) |
| { |
| const struct hc_driver *driver = &ohci_spear_hc_driver; |
| struct ohci_hcd *ohci; |
| struct usb_hcd *hcd = NULL; |
| struct clk *usbh_clk; |
| struct spear_ohci *sohci_p; |
| struct resource *res; |
| int retval, irq; |
| |
| irq = platform_get_irq(pdev, 0); |
| if (irq < 0) { |
| retval = irq; |
| goto fail; |
| } |
| |
| /* |
| * 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. |
| */ |
| retval = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32)); |
| if (retval) |
| goto fail; |
| |
| usbh_clk = devm_clk_get(&pdev->dev, NULL); |
| if (IS_ERR(usbh_clk)) { |
| dev_err(&pdev->dev, "Error getting interface clock\n"); |
| retval = PTR_ERR(usbh_clk); |
| goto fail; |
| } |
| |
| hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev)); |
| if (!hcd) { |
| retval = -ENOMEM; |
| goto fail; |
| } |
| |
| res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| hcd->regs = devm_ioremap_resource(&pdev->dev, res); |
| if (IS_ERR(hcd->regs)) { |
| retval = PTR_ERR(hcd->regs); |
| goto err_put_hcd; |
| } |
| |
| hcd->rsrc_start = pdev->resource[0].start; |
| hcd->rsrc_len = resource_size(res); |
| |
| sohci_p = to_spear_ohci(hcd); |
| sohci_p->clk = usbh_clk; |
| |
| clk_prepare_enable(sohci_p->clk); |
| |
| ohci = hcd_to_ohci(hcd); |
| |
| retval = usb_add_hcd(hcd, platform_get_irq(pdev, 0), 0); |
| if (retval == 0) { |
| device_wakeup_enable(hcd->self.controller); |
| return retval; |
| } |
| |
| clk_disable_unprepare(sohci_p->clk); |
| err_put_hcd: |
| usb_put_hcd(hcd); |
| fail: |
| 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 *sohci_p = to_spear_ohci(hcd); |
| |
| usb_remove_hcd(hcd); |
| if (sohci_p->clk) |
| clk_disable_unprepare(sohci_p->clk); |
| |
| usb_put_hcd(hcd); |
| return 0; |
| } |
| |
| #if defined(CONFIG_PM) |
| static int spear_ohci_hcd_drv_suspend(struct platform_device *pdev, |
| pm_message_t message) |
| { |
| struct usb_hcd *hcd = platform_get_drvdata(pdev); |
| struct ohci_hcd *ohci = hcd_to_ohci(hcd); |
| struct spear_ohci *sohci_p = to_spear_ohci(hcd); |
| bool do_wakeup = device_may_wakeup(&pdev->dev); |
| int ret; |
| |
| if (time_before(jiffies, ohci->next_statechange)) |
| msleep(5); |
| ohci->next_statechange = jiffies; |
| |
| ret = ohci_suspend(hcd, do_wakeup); |
| if (ret) |
| return ret; |
| |
| clk_disable_unprepare(sohci_p->clk); |
| |
| return ret; |
| } |
| |
| 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 *sohci_p = to_spear_ohci(hcd); |
| |
| if (time_before(jiffies, ohci->next_statechange)) |
| msleep(5); |
| ohci->next_statechange = jiffies; |
| |
| clk_prepare_enable(sohci_p->clk); |
| ohci_resume(hcd, false); |
| return 0; |
| } |
| #endif |
| |
| static const struct of_device_id spear_ohci_id_table[] = { |
| { .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 = spear_ohci_id_table, |
| }, |
| }; |
| |
| static const struct ohci_driver_overrides spear_overrides __initconst = { |
| .extra_priv_size = sizeof(struct spear_ohci), |
| }; |
| static int __init ohci_spear_init(void) |
| { |
| if (usb_disabled()) |
| return -ENODEV; |
| |
| pr_info("%s: " DRIVER_DESC "\n", hcd_name); |
| |
| ohci_init_driver(&ohci_spear_hc_driver, &spear_overrides); |
| return platform_driver_register(&spear_ohci_hcd_driver); |
| } |
| module_init(ohci_spear_init); |
| |
| static void __exit ohci_spear_cleanup(void) |
| { |
| platform_driver_unregister(&spear_ohci_hcd_driver); |
| } |
| module_exit(ohci_spear_cleanup); |
| |
| MODULE_DESCRIPTION(DRIVER_DESC); |
| MODULE_AUTHOR("Deepak Sikri"); |
| MODULE_LICENSE("GPL v2"); |
| MODULE_ALIAS("platform:spear-ohci"); |