265 lines
6.3 KiB
C
265 lines
6.3 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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*
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* Bus Glue for Sharp LH7A404
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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 Rusell 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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* This file is licenced under the GPL.
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*/
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#include <asm/hardware.h>
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extern int usb_disabled(void);
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/*-------------------------------------------------------------------------*/
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static void lh7a404_start_hc(struct platform_device *dev)
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{
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printk(KERN_DEBUG __FILE__
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": starting LH7A404 OHCI USB Controller\n");
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/*
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* Now, carefully enable the USB clock, and take
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* the USB host controller out of reset.
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*/
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CSC_PWRCNT |= CSC_PWRCNT_USBH_EN; /* Enable clock */
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udelay(1000);
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USBH_CMDSTATUS = OHCI_HCR;
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printk(KERN_DEBUG __FILE__
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": Clock to USB host has been enabled \n");
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}
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static void lh7a404_stop_hc(struct platform_device *dev)
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{
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printk(KERN_DEBUG __FILE__
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": stopping LH7A404 OHCI USB Controller\n");
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CSC_PWRCNT &= ~CSC_PWRCNT_USBH_EN; /* Disable clock */
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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_lh7a404_probe - initialize LH7A404-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_lh7a404_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[1].flags != IORESOURCE_IRQ) {
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pr_debug("resource[1] is not IORESOURCE_IRQ");
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return -ENOMEM;
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}
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hcd = usb_create_hcd(driver, &dev->dev, "lh7a404");
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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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lh7a404_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, SA_INTERRUPT);
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if (retval == 0)
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return retval;
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lh7a404_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_lh7a404_remove - shutdown processing for LH7A404-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_lh7a404_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_lh7a404_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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lh7a404_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_lh7a404_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_lh7a404_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_lh7a404_hc_driver = {
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.description = hcd_name,
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.product_desc = "LH7A404 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_lh7a404_start,
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#ifdef CONFIG_PM
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/* suspend: ohci_lh7a404_suspend, -- tbd */
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/* resume: ohci_lh7a404_resume, -- tbd */
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#endif /*CONFIG_PM*/
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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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};
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/*-------------------------------------------------------------------------*/
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static int ohci_hcd_lh7a404_drv_probe(struct device *dev)
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{
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struct platform_device *pdev = to_platform_device(dev);
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int ret;
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pr_debug ("In ohci_hcd_lh7a404_drv_probe");
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if (usb_disabled())
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return -ENODEV;
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ret = usb_hcd_lh7a404_probe(&ohci_lh7a404_hc_driver, pdev);
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return ret;
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}
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static int ohci_hcd_lh7a404_drv_remove(struct device *dev)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct usb_hcd *hcd = dev_get_drvdata(dev);
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usb_hcd_lh7a404_remove(hcd, pdev);
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return 0;
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}
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/*TBD*/
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/*static int ohci_hcd_lh7a404_drv_suspend(struct device *dev)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct usb_hcd *hcd = dev_get_drvdata(dev);
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return 0;
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}
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static int ohci_hcd_lh7a404_drv_resume(struct device *dev)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct usb_hcd *hcd = dev_get_drvdata(dev);
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return 0;
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}
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*/
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static struct device_driver ohci_hcd_lh7a404_driver = {
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.name = "lh7a404-ohci",
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.bus = &platform_bus_type,
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.probe = ohci_hcd_lh7a404_drv_probe,
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.remove = ohci_hcd_lh7a404_drv_remove,
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/*.suspend = ohci_hcd_lh7a404_drv_suspend, */
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/*.resume = ohci_hcd_lh7a404_drv_resume, */
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};
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static int __init ohci_hcd_lh7a404_init (void)
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{
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pr_debug (DRIVER_INFO " (LH7A404)");
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pr_debug ("block sizes: ed %d td %d\n",
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sizeof (struct ed), sizeof (struct td));
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return driver_register(&ohci_hcd_lh7a404_driver);
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}
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static void __exit ohci_hcd_lh7a404_cleanup (void)
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{
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driver_unregister(&ohci_hcd_lh7a404_driver);
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}
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module_init (ohci_hcd_lh7a404_init);
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module_exit (ohci_hcd_lh7a404_cleanup);
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