298 lines
6.9 KiB
C
298 lines
6.9 KiB
C
/*
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* xhci-plat.c - xHCI host controller driver platform Bus Glue.
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*
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* Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com
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* Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
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*
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* A lot of code borrowed from the Linux xHCI driver.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*/
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#include <linux/clk.h>
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#include <linux/dma-mapping.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include "xhci.h"
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#include "xhci-mvebu.h"
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static void xhci_plat_quirks(struct device *dev, struct xhci_hcd *xhci)
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{
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/*
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* As of now platform drivers don't provide MSI support so we ensure
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* here that the generic code does not try to make a pci_dev from our
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* dev struct in order to setup MSI
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*/
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xhci->quirks |= XHCI_PLAT;
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}
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/* called during probe() after chip reset completes */
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static int xhci_plat_setup(struct usb_hcd *hcd)
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{
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return xhci_gen_setup(hcd, xhci_plat_quirks);
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}
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static int xhci_plat_start(struct usb_hcd *hcd)
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{
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return xhci_run(hcd);
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}
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static const struct hc_driver xhci_plat_xhci_driver = {
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.description = "xhci-hcd",
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.product_desc = "xHCI Host Controller",
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.hcd_priv_size = sizeof(struct xhci_hcd *),
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/*
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* generic hardware linkage
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*/
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.irq = xhci_irq,
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.flags = HCD_MEMORY | HCD_USB3 | HCD_SHARED,
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/*
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* basic lifecycle operations
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*/
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.reset = xhci_plat_setup,
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.start = xhci_plat_start,
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.stop = xhci_stop,
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.shutdown = xhci_shutdown,
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/*
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* managing i/o requests and associated device resources
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*/
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.urb_enqueue = xhci_urb_enqueue,
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.urb_dequeue = xhci_urb_dequeue,
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.alloc_dev = xhci_alloc_dev,
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.free_dev = xhci_free_dev,
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.alloc_streams = xhci_alloc_streams,
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.free_streams = xhci_free_streams,
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.add_endpoint = xhci_add_endpoint,
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.drop_endpoint = xhci_drop_endpoint,
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.endpoint_reset = xhci_endpoint_reset,
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.check_bandwidth = xhci_check_bandwidth,
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.reset_bandwidth = xhci_reset_bandwidth,
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.address_device = xhci_address_device,
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.enable_device = xhci_enable_device,
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.update_hub_device = xhci_update_hub_device,
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.reset_device = xhci_discover_or_reset_device,
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/*
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* scheduling support
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*/
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.get_frame_number = xhci_get_frame,
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/* Root hub support */
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.hub_control = xhci_hub_control,
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.hub_status_data = xhci_hub_status_data,
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.bus_suspend = xhci_bus_suspend,
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.bus_resume = xhci_bus_resume,
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};
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static int xhci_plat_probe(struct platform_device *pdev)
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{
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const struct hc_driver *driver;
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struct xhci_hcd *xhci;
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struct resource *res;
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struct usb_hcd *hcd;
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struct clk *clk;
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int ret;
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int irq;
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if (usb_disabled())
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return -ENODEV;
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driver = &xhci_plat_xhci_driver;
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irq = platform_get_irq(pdev, 0);
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if (irq < 0)
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return -ENODEV;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!res)
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return -ENODEV;
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if (of_device_is_compatible(pdev->dev.of_node,
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"marvell,armada-375-xhci") ||
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of_device_is_compatible(pdev->dev.of_node,
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"marvell,armada-380-xhci")) {
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ret = xhci_mvebu_mbus_init_quirk(pdev);
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if (ret)
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return ret;
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}
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/* Initialize dma_mask and coherent_dma_mask to 32-bits */
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ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
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if (ret)
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return ret;
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if (!pdev->dev.dma_mask)
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pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
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else
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dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
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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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return -ENOMEM;
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hcd->rsrc_start = res->start;
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hcd->rsrc_len = resource_size(res);
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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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ret = -EBUSY;
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goto put_hcd;
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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) {
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dev_dbg(&pdev->dev, "error mapping memory\n");
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ret = -EFAULT;
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goto release_mem_region;
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}
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/*
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* Not all platforms have a clk so it is not an error if the
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* clock does not exists.
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*/
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clk = devm_clk_get(&pdev->dev, NULL);
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if (!IS_ERR(clk)) {
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ret = clk_prepare_enable(clk);
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if (ret)
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goto unmap_registers;
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}
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ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
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if (ret)
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goto disable_clk;
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device_wakeup_enable(hcd->self.controller);
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/* USB 2.0 roothub is stored in the platform_device now. */
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hcd = platform_get_drvdata(pdev);
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xhci = hcd_to_xhci(hcd);
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xhci->clk = clk;
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xhci->shared_hcd = usb_create_shared_hcd(driver, &pdev->dev,
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dev_name(&pdev->dev), hcd);
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if (!xhci->shared_hcd) {
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ret = -ENOMEM;
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goto dealloc_usb2_hcd;
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}
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/*
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* Set the xHCI pointer before xhci_plat_setup() (aka hcd_driver.reset)
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* is called by usb_add_hcd().
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*/
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*((struct xhci_hcd **) xhci->shared_hcd->hcd_priv) = xhci;
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if (HCC_MAX_PSA(xhci->hcc_params) >= 4)
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xhci->shared_hcd->can_do_streams = 1;
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ret = usb_add_hcd(xhci->shared_hcd, irq, IRQF_SHARED);
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if (ret)
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goto put_usb3_hcd;
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return 0;
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put_usb3_hcd:
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usb_put_hcd(xhci->shared_hcd);
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dealloc_usb2_hcd:
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usb_remove_hcd(hcd);
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disable_clk:
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if (!IS_ERR(clk))
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clk_disable_unprepare(clk);
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unmap_registers:
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iounmap(hcd->regs);
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release_mem_region:
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release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
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put_hcd:
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usb_put_hcd(hcd);
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return ret;
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}
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static int xhci_plat_remove(struct platform_device *dev)
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{
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struct usb_hcd *hcd = platform_get_drvdata(dev);
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struct xhci_hcd *xhci = hcd_to_xhci(hcd);
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struct clk *clk = xhci->clk;
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usb_remove_hcd(xhci->shared_hcd);
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usb_put_hcd(xhci->shared_hcd);
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usb_remove_hcd(hcd);
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if (!IS_ERR(clk))
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clk_disable_unprepare(clk);
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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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kfree(xhci);
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return 0;
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}
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#ifdef CONFIG_PM_SLEEP
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static int xhci_plat_suspend(struct device *dev)
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{
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struct usb_hcd *hcd = dev_get_drvdata(dev);
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struct xhci_hcd *xhci = hcd_to_xhci(hcd);
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return xhci_suspend(xhci);
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}
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static int xhci_plat_resume(struct device *dev)
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{
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struct usb_hcd *hcd = dev_get_drvdata(dev);
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struct xhci_hcd *xhci = hcd_to_xhci(hcd);
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return xhci_resume(xhci, 0);
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}
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static const struct dev_pm_ops xhci_plat_pm_ops = {
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SET_SYSTEM_SLEEP_PM_OPS(xhci_plat_suspend, xhci_plat_resume)
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};
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#define DEV_PM_OPS (&xhci_plat_pm_ops)
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#else
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#define DEV_PM_OPS NULL
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#endif /* CONFIG_PM */
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#ifdef CONFIG_OF
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static const struct of_device_id usb_xhci_of_match[] = {
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{ .compatible = "generic-xhci" },
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{ .compatible = "xhci-platform" },
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{ .compatible = "marvell,armada-375-xhci"},
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{ .compatible = "marvell,armada-380-xhci"},
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{ },
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};
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MODULE_DEVICE_TABLE(of, usb_xhci_of_match);
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#endif
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static struct platform_driver usb_xhci_driver = {
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.probe = xhci_plat_probe,
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.remove = xhci_plat_remove,
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.driver = {
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.name = "xhci-hcd",
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.pm = DEV_PM_OPS,
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.of_match_table = of_match_ptr(usb_xhci_of_match),
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},
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};
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MODULE_ALIAS("platform:xhci-hcd");
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int xhci_register_plat(void)
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{
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return platform_driver_register(&usb_xhci_driver);
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}
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void xhci_unregister_plat(void)
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{
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platform_driver_unregister(&usb_xhci_driver);
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}
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