236 lines
5.2 KiB
C
236 lines
5.2 KiB
C
/*
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* OHCI HCD (Host Controller Driver) for USB.
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*
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* (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
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* (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net>
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* (C) Copyright 2002 Hewlett-Packard Company
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* (C) Copyright 2006 Sylvain Munaut <tnt@246tNt.com>
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*
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* Bus glue for OHCI HC on the of_platform bus
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*
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* Modified for of_platform bus from ohci-sa1111.c
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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/signal.h>
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#include <linux/of_address.h>
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#include <linux/of_irq.h>
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#include <linux/of_platform.h>
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#include <asm/prom.h>
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static int
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ohci_ppc_of_start(struct usb_hcd *hcd)
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{
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struct ohci_hcd *ohci = hcd_to_ohci(hcd);
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int ret;
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if ((ret = ohci_init(ohci)) < 0)
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return ret;
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if ((ret = ohci_run(ohci)) < 0) {
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dev_err(hcd->self.controller, "can't start %s\n",
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hcd->self.bus_name);
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ohci_stop(hcd);
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return ret;
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}
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return 0;
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}
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static const struct hc_driver ohci_ppc_of_hc_driver = {
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.description = hcd_name,
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.product_desc = "OF OHCI",
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.hcd_priv_size = sizeof(struct ohci_hcd),
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/*
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* generic hardware linkage
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*/
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.irq = ohci_irq,
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.flags = HCD_USB11 | HCD_MEMORY,
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/*
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* basic lifecycle operations
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*/
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.start = ohci_ppc_of_start,
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.stop = ohci_stop,
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.shutdown = ohci_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 = ohci_urb_enqueue,
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.urb_dequeue = ohci_urb_dequeue,
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.endpoint_disable = ohci_endpoint_disable,
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/*
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* scheduling support
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*/
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.get_frame_number = ohci_get_frame,
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/*
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* root hub support
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*/
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.hub_status_data = ohci_hub_status_data,
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.hub_control = ohci_hub_control,
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#ifdef CONFIG_PM
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.bus_suspend = ohci_bus_suspend,
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.bus_resume = ohci_bus_resume,
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#endif
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.start_port_reset = ohci_start_port_reset,
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};
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static int ohci_hcd_ppc_of_probe(struct platform_device *op)
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{
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struct device_node *dn = op->dev.of_node;
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struct usb_hcd *hcd;
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struct ohci_hcd *ohci;
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struct resource res;
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int irq;
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int rv;
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int is_bigendian;
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struct device_node *np;
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if (usb_disabled())
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return -ENODEV;
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is_bigendian =
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of_device_is_compatible(dn, "ohci-bigendian") ||
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of_device_is_compatible(dn, "ohci-be");
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dev_dbg(&op->dev, "initializing PPC-OF USB Controller\n");
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rv = of_address_to_resource(dn, 0, &res);
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if (rv)
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return rv;
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hcd = usb_create_hcd(&ohci_ppc_of_hc_driver, &op->dev, "PPC-OF USB");
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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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hcd->regs = devm_ioremap_resource(&op->dev, &res);
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if (IS_ERR(hcd->regs)) {
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rv = PTR_ERR(hcd->regs);
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goto err_rmr;
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}
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irq = irq_of_parse_and_map(dn, 0);
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if (irq == NO_IRQ) {
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dev_err(&op->dev, "%s: irq_of_parse_and_map failed\n",
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__FILE__);
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rv = -EBUSY;
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goto err_rmr;
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}
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ohci = hcd_to_ohci(hcd);
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if (is_bigendian) {
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ohci->flags |= OHCI_QUIRK_BE_MMIO | OHCI_QUIRK_BE_DESC;
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if (of_device_is_compatible(dn, "fsl,mpc5200-ohci"))
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ohci->flags |= OHCI_QUIRK_FRAME_NO;
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if (of_device_is_compatible(dn, "mpc5200-ohci"))
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ohci->flags |= OHCI_QUIRK_FRAME_NO;
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}
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ohci_hcd_init(ohci);
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rv = usb_add_hcd(hcd, irq, 0);
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if (rv == 0) {
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device_wakeup_enable(hcd->self.controller);
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return 0;
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}
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/* by now, 440epx is known to show usb_23 erratum */
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np = of_find_compatible_node(NULL, NULL, "ibm,usb-ehci-440epx");
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/* Work around - At this point ohci_run has executed, the
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* controller is running, everything, the root ports, etc., is
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* set up. If the ehci driver is loaded, put the ohci core in
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* the suspended state. The ehci driver will bring it out of
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* suspended state when / if a non-high speed USB device is
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* attached to the USB Host port. If the ehci driver is not
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* loaded, do nothing. request_mem_region is used to test if
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* the ehci driver is loaded.
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*/
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if (np != NULL) {
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if (!of_address_to_resource(np, 0, &res)) {
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if (!request_mem_region(res.start, 0x4, hcd_name)) {
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writel_be((readl_be(&ohci->regs->control) |
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OHCI_USB_SUSPEND), &ohci->regs->control);
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(void) readl_be(&ohci->regs->control);
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} else
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release_mem_region(res.start, 0x4);
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} else
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pr_debug("%s: cannot get ehci offset from fdt\n", __FILE__);
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}
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irq_dispose_mapping(irq);
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err_rmr:
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usb_put_hcd(hcd);
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return rv;
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}
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static int ohci_hcd_ppc_of_remove(struct platform_device *op)
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{
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struct usb_hcd *hcd = platform_get_drvdata(op);
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dev_dbg(&op->dev, "stopping PPC-OF USB Controller\n");
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usb_remove_hcd(hcd);
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irq_dispose_mapping(hcd->irq);
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usb_put_hcd(hcd);
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return 0;
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}
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static const struct of_device_id ohci_hcd_ppc_of_match[] = {
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#ifdef CONFIG_USB_OHCI_HCD_PPC_OF_BE
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{
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.name = "usb",
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.compatible = "ohci-bigendian",
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},
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{
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.name = "usb",
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.compatible = "ohci-be",
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},
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#endif
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#ifdef CONFIG_USB_OHCI_HCD_PPC_OF_LE
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{
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.name = "usb",
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.compatible = "ohci-littledian",
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},
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{
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.name = "usb",
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.compatible = "ohci-le",
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},
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#endif
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{},
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};
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MODULE_DEVICE_TABLE(of, ohci_hcd_ppc_of_match);
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#if !defined(CONFIG_USB_OHCI_HCD_PPC_OF_BE) && \
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!defined(CONFIG_USB_OHCI_HCD_PPC_OF_LE)
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#error "No endianness selected for ppc-of-ohci"
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#endif
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static struct platform_driver ohci_hcd_ppc_of_driver = {
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.probe = ohci_hcd_ppc_of_probe,
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.remove = ohci_hcd_ppc_of_remove,
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.shutdown = usb_hcd_platform_shutdown,
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.driver = {
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.name = "ppc-of-ohci",
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.of_match_table = ohci_hcd_ppc_of_match,
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},
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};
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