| /* |
| * xhci-brcm.c - xHCI host controller driver platform Bus Glue. |
| * |
| * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com |
| * Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de> |
| * |
| * A lot of code borrowed from the Linux xHCI driver. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * version 2 as published by the Free Software Foundation. |
| */ |
| |
| #include <linux/platform_device.h> |
| #include <linux/module.h> |
| #include <linux/slab.h> |
| #include <linux/of.h> |
| #include <linux/dma-mapping.h> |
| #include <linux/clk.h> |
| |
| #include "xhci.h" |
| #include "usb-brcm.h" |
| |
| static struct hc_driver __read_mostly xhci_brcm_hc_driver; |
| |
| |
| #define BRCM_DRIVER_DESC "xHCI BRCM driver" |
| #define BRCM_DRIVER_NAME "xhci-brcm" |
| |
| struct brcm_hcd { |
| /* |
| * xhci_hcd_ptr must always be the first entry |
| * because the XHCI driver expects this pointer |
| * to be at the beginning of the hcd_priv area |
| * in the usb_hcd structure. |
| */ |
| struct xhci_hcd *xhci_hcd_ptr; |
| struct clk *hcd_clk; |
| }; |
| |
| static struct brcm_hcd *hcd_to_brcm(struct usb_hcd *hcd) |
| { |
| return (struct brcm_hcd *)hcd->hcd_priv; |
| } |
| |
| static void xhci_brcm_quirks(struct device *dev, struct xhci_hcd *xhci) |
| { |
| /* |
| * As of now platform drivers don't provide MSI support so we ensure |
| * here that the generic code does not try to make a pci_dev from our |
| * dev struct in order to setup MSI |
| */ |
| xhci->quirks |= XHCI_PLAT; |
| |
| /* |
| * The Broadcom XHCI core does not support save/restore state |
| * so we need to reset on resume. |
| */ |
| xhci->quirks |= XHCI_RESET_ON_RESUME; |
| } |
| |
| /* called during probe() after chip reset completes */ |
| static int xhci_brcm_setup(struct usb_hcd *hcd) |
| { |
| return xhci_gen_setup(hcd, xhci_brcm_quirks); |
| } |
| |
| static int xhci_brcm_probe(struct platform_device *pdev) |
| { |
| struct xhci_hcd *xhci; |
| struct usb_hcd *hcd; |
| struct clk *usb_clk; |
| struct brcm_hcd *brcm_hcd_ptr; |
| int ret; |
| |
| ret = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64)); |
| if (ret) |
| return ret; |
| |
| ret = brcm_usb_probe(pdev, &xhci_brcm_hc_driver, &hcd, &usb_clk); |
| if (ret) |
| return ret; |
| brcm_hcd_ptr = hcd_to_brcm(hcd); |
| brcm_hcd_ptr->hcd_clk = usb_clk; |
| |
| /* USB 2.0 roothub is stored in the platform_device now. */ |
| hcd = platform_get_drvdata(pdev); |
| xhci = hcd_to_xhci(hcd); |
| xhci->shared_hcd = usb_create_shared_hcd(&xhci_brcm_hc_driver, |
| &pdev->dev, dev_name(&pdev->dev), hcd); |
| if (!xhci->shared_hcd) { |
| ret = -ENOMEM; |
| goto dealloc_usb2_hcd; |
| } |
| |
| /* |
| * Set the xHCI pointer before xhci_brcm_setup() (aka hcd_driver.reset) |
| * is called by usb_add_hcd(). |
| */ |
| *((struct xhci_hcd **) xhci->shared_hcd->hcd_priv) = xhci; |
| |
| ret = usb_add_hcd(xhci->shared_hcd, hcd->irq, IRQF_SHARED); |
| if (ret) |
| goto put_usb3_hcd; |
| brcm_hcd_ptr = hcd_to_brcm(hcd); |
| brcm_hcd_ptr->hcd_clk = usb_clk; |
| |
| return 0; |
| |
| put_usb3_hcd: |
| usb_put_hcd(xhci->shared_hcd); |
| |
| dealloc_usb2_hcd: |
| usb_remove_hcd(hcd); |
| usb_put_hcd(hcd); |
| |
| return ret; |
| } |
| |
| static int xhci_brcm_remove(struct platform_device *dev) |
| { |
| struct usb_hcd *hcd = platform_get_drvdata(dev); |
| struct xhci_hcd *xhci = hcd_to_xhci(hcd); |
| struct brcm_hcd *brcm_hcd_ptr = hcd_to_brcm(hcd); |
| |
| usb_remove_hcd(xhci->shared_hcd); |
| usb_put_hcd(xhci->shared_hcd); |
| |
| brcm_usb_remove(dev, brcm_hcd_ptr->hcd_clk); |
| kfree(xhci); |
| |
| return 0; |
| } |
| |
| #ifdef CONFIG_PM_SLEEP |
| static int xhci_brcm_suspend(struct device *dev) |
| { |
| int ret; |
| struct usb_hcd *hcd = dev_get_drvdata(dev); |
| struct xhci_hcd *xhci = hcd_to_xhci(hcd); |
| struct brcm_hcd *brcm_hcd_ptr = hcd_to_brcm(hcd); |
| |
| ret = xhci_suspend(xhci, device_may_wakeup(dev)); |
| clk_disable(brcm_hcd_ptr->hcd_clk); |
| return ret; |
| } |
| |
| static int xhci_brcm_resume(struct device *dev) |
| { |
| struct usb_hcd *hcd = dev_get_drvdata(dev); |
| struct xhci_hcd *xhci = hcd_to_xhci(hcd); |
| struct brcm_hcd *brcm_hcd_ptr = hcd_to_brcm(hcd); |
| int err; |
| |
| err = clk_enable(brcm_hcd_ptr->hcd_clk); |
| if (err) |
| return err; |
| return xhci_resume(xhci, 0); |
| } |
| |
| #endif /* CONFIG_PM_SLEEP */ |
| |
| static SIMPLE_DEV_PM_OPS(xhci_brcm_pm_ops, xhci_brcm_suspend, |
| xhci_brcm_resume); |
| |
| #ifdef CONFIG_OF |
| static const struct of_device_id brcm_xhci_of_match[] = { |
| { .compatible = "xhci-platform" }, |
| { .compatible = "brcm,xhci-brcm" }, |
| { }, |
| }; |
| MODULE_DEVICE_TABLE(of, brcm_xhci_of_match); |
| #endif |
| |
| static struct platform_driver xhci_brcm_driver = { |
| .probe = xhci_brcm_probe, |
| .remove = xhci_brcm_remove, |
| .driver = { |
| .name = BRCM_DRIVER_NAME, |
| .pm = &xhci_brcm_pm_ops, |
| .of_match_table = of_match_ptr(brcm_xhci_of_match), |
| }, |
| }; |
| |
| static int __init xhci_brcm_init(void) |
| { |
| if (usb_disabled()) |
| return -ENODEV; |
| pr_info("%s: " BRCM_DRIVER_DESC "\n", BRCM_DRIVER_NAME); |
| xhci_init_driver(&xhci_brcm_hc_driver, xhci_brcm_setup); |
| xhci_brcm_hc_driver.hcd_priv_size = sizeof(struct brcm_hcd); |
| return platform_driver_register(&xhci_brcm_driver); |
| } |
| module_init(xhci_brcm_init); |
| |
| static void __exit xhci_brcm_cleanup(void) |
| { |
| platform_driver_unregister(&xhci_brcm_driver); |
| } |
| module_exit(xhci_brcm_cleanup); |
| |
| MODULE_DESCRIPTION(BRCM_DRIVER_DESC); |
| MODULE_AUTHOR("Al Cooper"); |
| MODULE_LICENSE("GPL"); |