202 lines
4.8 KiB
C
202 lines
4.8 KiB
C
/*
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* EHCI HCD (Host Controller Driver) for USB.
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*
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* (C) Copyright 2006-2007 Stefan Roese <sr@denx.de>, DENX Software Engineering
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*
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* Bus Glue for PPC On-Chip EHCI driver
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* Tested on AMCC 440EPx
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*
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* Based on "ehci-au1xxx.c" by K.Boge <karsten.boge@amd.com>
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*
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* This file is licenced under the GPL.
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*/
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#include <linux/platform_device.h>
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extern int usb_disabled(void);
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/* called during probe() after chip reset completes */
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static int ehci_ppc_soc_setup(struct usb_hcd *hcd)
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{
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struct ehci_hcd *ehci = hcd_to_ehci(hcd);
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int retval;
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retval = ehci_halt(ehci);
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if (retval)
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return retval;
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retval = ehci_init(hcd);
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if (retval)
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return retval;
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ehci->sbrn = 0x20;
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return ehci_reset(ehci);
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}
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/**
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* usb_ehci_ppc_soc_probe - initialize PPC-SoC-based HCDs
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* Context: !in_interrupt()
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*
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* Allocates basic resources for this USB host controller, and
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* then invokes the start() method for the HCD associated with it
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* through the hotplug entry's driver_data.
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*
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*/
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int usb_ehci_ppc_soc_probe(const struct hc_driver *driver,
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struct usb_hcd **hcd_out,
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struct platform_device *dev)
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{
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int retval;
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struct usb_hcd *hcd;
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struct ehci_hcd *ehci;
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if (dev->resource[1].flags != IORESOURCE_IRQ) {
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pr_debug("resource[1] is not IORESOURCE_IRQ");
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retval = -ENOMEM;
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}
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hcd = usb_create_hcd(driver, &dev->dev, "PPC-SOC EHCI");
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if (!hcd)
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return -ENOMEM;
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hcd->rsrc_start = dev->resource[0].start;
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hcd->rsrc_len = dev->resource[0].end - dev->resource[0].start + 1;
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if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
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pr_debug("request_mem_region failed");
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retval = -EBUSY;
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goto err1;
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}
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hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
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if (!hcd->regs) {
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pr_debug("ioremap failed");
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retval = -ENOMEM;
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goto err2;
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}
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ehci = hcd_to_ehci(hcd);
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ehci->big_endian_mmio = 1;
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ehci->big_endian_desc = 1;
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ehci->caps = hcd->regs;
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ehci->regs = hcd->regs + HC_LENGTH(ehci_readl(ehci, &ehci->caps->hc_capbase));
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/* cache this readonly data; minimize chip reads */
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ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
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#if defined(CONFIG_440EPX)
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/*
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* 440EPx Errata USBH_3
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* Fix: Enable Break Memory Transfer (BMT) in INSNREG3
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*/
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out_be32((void *)((ulong)(&ehci->regs->command) + 0x8c), (1 << 0));
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ehci_dbg(ehci, "Break Memory Transfer (BMT) has beed enabled!\n");
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#endif
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retval = usb_add_hcd(hcd, dev->resource[1].start, IRQF_DISABLED);
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if (retval == 0)
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return retval;
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iounmap(hcd->regs);
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err2:
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release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
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err1:
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usb_put_hcd(hcd);
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return retval;
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}
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/* may be called without controller electrically present */
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/* may be called with controller, bus, and devices active */
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/**
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* usb_ehci_hcd_ppc_soc_remove - shutdown processing for PPC-SoC-based HCDs
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* @dev: USB Host Controller being removed
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* Context: !in_interrupt()
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*
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* Reverses the effect of usb_ehci_hcd_ppc_soc_probe(), first invoking
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* the HCD's stop() method. It is always called from a thread
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* context, normally "rmmod", "apmd", or something similar.
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*
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*/
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void usb_ehci_ppc_soc_remove(struct usb_hcd *hcd, struct platform_device *dev)
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{
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usb_remove_hcd(hcd);
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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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}
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static const struct hc_driver ehci_ppc_soc_hc_driver = {
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.description = hcd_name,
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.product_desc = "PPC-SOC EHCI",
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.hcd_priv_size = sizeof(struct ehci_hcd),
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/*
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* generic hardware linkage
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*/
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.irq = ehci_irq,
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.flags = HCD_MEMORY | HCD_USB2,
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/*
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* basic lifecycle operations
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*/
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.reset = ehci_ppc_soc_setup,
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.start = ehci_run,
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.stop = ehci_stop,
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.shutdown = ehci_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 = ehci_urb_enqueue,
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.urb_dequeue = ehci_urb_dequeue,
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.endpoint_disable = ehci_endpoint_disable,
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/*
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* scheduling support
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*/
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.get_frame_number = ehci_get_frame,
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/*
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* root hub support
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*/
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.hub_status_data = ehci_hub_status_data,
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.hub_control = ehci_hub_control,
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.bus_suspend = ehci_bus_suspend,
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.bus_resume = ehci_bus_resume,
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.relinquish_port = ehci_relinquish_port,
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.port_handed_over = ehci_port_handed_over,
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};
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static int ehci_hcd_ppc_soc_drv_probe(struct platform_device *pdev)
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{
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struct usb_hcd *hcd = NULL;
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int ret;
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pr_debug("In ehci_hcd_ppc_soc_drv_probe\n");
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if (usb_disabled())
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return -ENODEV;
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/* FIXME we only want one one probe() not two */
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ret = usb_ehci_ppc_soc_probe(&ehci_ppc_soc_hc_driver, &hcd, pdev);
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return ret;
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}
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static int ehci_hcd_ppc_soc_drv_remove(struct platform_device *pdev)
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{
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struct usb_hcd *hcd = platform_get_drvdata(pdev);
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/* FIXME we only want one one remove() not two */
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usb_ehci_ppc_soc_remove(hcd, pdev);
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return 0;
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}
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MODULE_ALIAS("platform:ppc-soc-ehci");
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static struct platform_driver ehci_ppc_soc_driver = {
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.probe = ehci_hcd_ppc_soc_drv_probe,
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.remove = ehci_hcd_ppc_soc_drv_remove,
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.shutdown = usb_hcd_platform_shutdown,
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.driver = {
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.name = "ppc-soc-ehci",
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}
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};
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