e872154921
This patch (as1069b) changes the way OHCI root-hub status-change interrupts are enabled. Currently a special HCD method, hub_irq_enable(), is called when the hub driver is finished using a root hub. This approach turns out to be subject to races, resulting in unnecessary polling. The patch does away with the method entirely. Instead, the driver automatically enables the RHSC interrupt when no more status changes are present. This scheme is safe with controllers using level-triggered semantics for their interrupt flags. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
243 lines
5.7 KiB
C
243 lines
5.7 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 2005 Embedded Alley Solutions, Inc.
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*
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* Bus Glue for PNX8550
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*
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* Written by Christopher Hoover <ch@hpl.hp.com>
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* Based on fragments of previous driver by Russell King et al.
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*
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* Modified for LH7A404 from ohci-sa1111.c
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* by Durgesh Pattamatta <pattamattad@sharpsec.com>
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*
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* Modified for PNX8550 from ohci-sa1111.c and sa-omap.c
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* by Vitaly Wool <vitalywool@gmail.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/device.h>
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#include <linux/platform_device.h>
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#include <asm/mach-pnx8550/usb.h>
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#include <asm/mach-pnx8550/int.h>
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#include <asm/mach-pnx8550/pci.h>
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#ifndef CONFIG_PNX8550
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#error "This file is PNX8550 bus glue. CONFIG_PNX8550 must be defined."
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#endif
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extern int usb_disabled(void);
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/*-------------------------------------------------------------------------*/
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static void pnx8550_start_hc(struct platform_device *dev)
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{
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/*
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* Set register CLK48CTL to enable and 48MHz
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*/
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outl(0x00000003, PCI_BASE | 0x0004770c);
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/*
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* Set register CLK12CTL to enable and 48MHz
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*/
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outl(0x00000003, PCI_BASE | 0x00047710);
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udelay(100);
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}
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static void pnx8550_stop_hc(struct platform_device *dev)
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{
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udelay(10);
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}
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/*-------------------------------------------------------------------------*/
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/* configure so an HC device and id are always provided */
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/* always called with process context; sleeping is OK */
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/**
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* usb_hcd_pnx8550_probe - initialize pnx8550-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_hcd_pnx8550_probe (const struct hc_driver *driver,
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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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if (dev->resource[0].flags != IORESOURCE_MEM ||
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dev->resource[1].flags != IORESOURCE_IRQ) {
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dev_err (&dev->dev,"invalid resource type\n");
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return -ENOMEM;
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}
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hcd = usb_create_hcd (driver, &dev->dev, "pnx8550");
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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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dev_err(&dev->dev, "request_mem_region [0x%08llx, 0x%08llx] "
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"failed\n", hcd->rsrc_start, hcd->rsrc_len);
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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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dev_err(&dev->dev, "ioremap [[0x%08llx, 0x%08llx] failed\n",
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hcd->rsrc_start, hcd->rsrc_len);
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retval = -ENOMEM;
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goto err2;
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}
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pnx8550_start_hc(dev);
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ohci_hcd_init(hcd_to_ohci(hcd));
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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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pnx8550_stop_hc(dev);
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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_hcd_pnx8550_remove - shutdown processing for pnx8550-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_hcd_pnx8550_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_hcd_pnx8550_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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pnx8550_stop_hc(dev);
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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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/*-------------------------------------------------------------------------*/
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static int __devinit
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ohci_pnx8550_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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ohci_dbg (ohci, "ohci_pnx8550_start, ohci:%p", ohci);
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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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err ("can't start %s", 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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/*-------------------------------------------------------------------------*/
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static const struct hc_driver ohci_pnx8550_hc_driver = {
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.description = hcd_name,
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.product_desc = "PNX8550 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_pnx8550_start,
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.stop = ohci_stop,
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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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/*-------------------------------------------------------------------------*/
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static int ohci_hcd_pnx8550_drv_probe(struct platform_device *pdev)
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{
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int ret;
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if (usb_disabled())
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return -ENODEV;
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ret = usb_hcd_pnx8550_probe(&ohci_pnx8550_hc_driver, pdev);
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return ret;
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}
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static int ohci_hcd_pnx8550_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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usb_hcd_pnx8550_remove(hcd, pdev);
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return 0;
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}
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MODULE_ALIAS("platform:pnx8550-ohci");
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static struct platform_driver ohci_hcd_pnx8550_driver = {
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.driver = {
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.name = "pnx8550-ohci",
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.owner = THIS_MODULE,
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},
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.probe = ohci_hcd_pnx8550_drv_probe,
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.remove = ohci_hcd_pnx8550_drv_remove,
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};
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