diff options
Diffstat (limited to 'drivers/usb/host/ohci-au1xxx.c')
| -rw-r--r-- | drivers/usb/host/ohci-au1xxx.c | 284 |
1 files changed, 284 insertions, 0 deletions
diff --git a/drivers/usb/host/ohci-au1xxx.c b/drivers/usb/host/ohci-au1xxx.c new file mode 100644 index 000000000000..3981bf15c8c7 --- /dev/null +++ b/drivers/usb/host/ohci-au1xxx.c @@ -0,0 +1,284 @@ +/* + * OHCI HCD (Host Controller Driver) for USB. + * + * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at> + * (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net> + * (C) Copyright 2002 Hewlett-Packard Company + * + * Bus Glue for AMD Alchemy Au1xxx + * + * Written by Christopher Hoover <ch@hpl.hp.com> + * Based on fragments of previous driver by Rusell King et al. + * + * Modified for LH7A404 from ohci-sa1111.c + * by Durgesh Pattamatta <pattamattad@sharpsec.com> + * Modified for AMD Alchemy Au1xxx + * by Matt Porter <mporter@kernel.crashing.org> + * + * This file is licenced under the GPL. + */ + +#include <asm/mach-au1x00/au1000.h> + +#define USBH_ENABLE_BE (1<<0) +#define USBH_ENABLE_C (1<<1) +#define USBH_ENABLE_E (1<<2) +#define USBH_ENABLE_CE (1<<3) +#define USBH_ENABLE_RD (1<<4) + +#ifdef __LITTLE_ENDIAN +#define USBH_ENABLE_INIT (USBH_ENABLE_CE | USBH_ENABLE_E | USBH_ENABLE_C) +#elif __BIG_ENDIAN +#define USBH_ENABLE_INIT (USBH_ENABLE_CE | USBH_ENABLE_E | USBH_ENABLE_C | USBH_ENABLE_BE) +#else +#error not byte order defined +#endif + +extern int usb_disabled(void); + +/*-------------------------------------------------------------------------*/ + +static void au1xxx_start_hc(struct platform_device *dev) +{ + printk(KERN_DEBUG __FILE__ + ": starting Au1xxx OHCI USB Controller\n"); + + /* enable host controller */ + au_writel(USBH_ENABLE_CE, USB_HOST_CONFIG); + udelay(1000); + au_writel(USBH_ENABLE_INIT, USB_HOST_CONFIG); + udelay(1000); + + /* wait for reset complete (read register twice; see au1500 errata) */ + while (au_readl(USB_HOST_CONFIG), + !(au_readl(USB_HOST_CONFIG) & USBH_ENABLE_RD)) + udelay(1000); + + printk(KERN_DEBUG __FILE__ + ": Clock to USB host has been enabled \n"); +} + +static void au1xxx_stop_hc(struct platform_device *dev) +{ + printk(KERN_DEBUG __FILE__ + ": stopping Au1xxx OHCI USB Controller\n"); + + /* Disable clock */ + au_writel(readl((void *)USB_HOST_CONFIG) & ~USBH_ENABLE_CE, USB_HOST_CONFIG); +} + + +/*-------------------------------------------------------------------------*/ + +/* configure so an HC device and id are always provided */ +/* always called with process context; sleeping is OK */ + + +/** + * usb_hcd_au1xxx_probe - initialize Au1xxx-based HCDs + * Context: !in_interrupt() + * + * Allocates basic resources for this USB host controller, and + * then invokes the start() method for the HCD associated with it + * through the hotplug entry's driver_data. + * + */ +int usb_hcd_au1xxx_probe (const struct hc_driver *driver, + struct platform_device *dev) +{ + int retval; + struct usb_hcd *hcd; + + if(dev->resource[1].flags != IORESOURCE_IRQ) { + pr_debug ("resource[1] is not IORESOURCE_IRQ"); + return -ENOMEM; + } + + hcd = usb_create_hcd(driver, &dev->dev, "au1xxx"); + if (!hcd) + return -ENOMEM; + hcd->rsrc_start = dev->resource[0].start; + hcd->rsrc_len = dev->resource[0].end - dev->resource[0].start + 1; + + if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) { + pr_debug("request_mem_region failed"); + retval = -EBUSY; + goto err1; + } + + hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len); + if (!hcd->regs) { + pr_debug("ioremap failed"); + retval = -ENOMEM; + goto err2; + } + + au1xxx_start_hc(dev); + ohci_hcd_init(hcd_to_ohci(hcd)); + + retval = usb_add_hcd(hcd, dev->resource[1].start, SA_INTERRUPT); + if (retval == 0) + return retval; + + au1xxx_stop_hc(dev); + iounmap(hcd->regs); + err2: + release_mem_region(hcd->rsrc_start, hcd->rsrc_len); + err1: + usb_put_hcd(hcd); + return retval; +} + + +/* may be called without controller electrically present */ +/* may be called with controller, bus, and devices active */ + +/** + * usb_hcd_au1xxx_remove - shutdown processing for Au1xxx-based HCDs + * @dev: USB Host Controller being removed + * Context: !in_interrupt() + * + * Reverses the effect of usb_hcd_au1xxx_probe(), first invoking + * the HCD's stop() method. It is always called from a thread + * context, normally "rmmod", "apmd", or something similar. + * + */ +void usb_hcd_au1xxx_remove (struct usb_hcd *hcd, struct platform_device *dev) +{ + usb_remove_hcd(hcd); + au1xxx_stop_hc(dev); + iounmap(hcd->regs); + release_mem_region(hcd->rsrc_start, hcd->rsrc_len); + usb_put_hcd(hcd); +} + +/*-------------------------------------------------------------------------*/ + +static int __devinit +ohci_au1xxx_start (struct usb_hcd *hcd) +{ + struct ohci_hcd *ohci = hcd_to_ohci (hcd); + int ret; + + ohci_dbg (ohci, "ohci_au1xxx_start, ohci:%p", ohci); + + if ((ret = ohci_init (ohci)) < 0) + return ret; + + if ((ret = ohci_run (ohci)) < 0) { + err ("can't start %s", hcd->self.bus_name); + ohci_stop (hcd); + return ret; + } + + return 0; +} + +/*-------------------------------------------------------------------------*/ + +static const struct hc_driver ohci_au1xxx_hc_driver = { + .description = hcd_name, + .product_desc = "Au1xxx OHCI", + .hcd_priv_size = sizeof(struct ohci_hcd), + + /* + * generic hardware linkage + */ + .irq = ohci_irq, + .flags = HCD_USB11 | HCD_MEMORY, + + /* + * basic lifecycle operations + */ + .start = ohci_au1xxx_start, +#ifdef CONFIG_PM + /* suspend: ohci_au1xxx_suspend, -- tbd */ + /* resume: ohci_au1xxx_resume, -- tbd */ +#endif /*CONFIG_PM*/ + .stop = ohci_stop, + + /* + * managing i/o requests and associated device resources + */ + .urb_enqueue = ohci_urb_enqueue, + .urb_dequeue = ohci_urb_dequeue, + .endpoint_disable = ohci_endpoint_disable, + + /* + * scheduling support + */ + .get_frame_number = ohci_get_frame, + + /* + * root hub support + */ + .hub_status_data = ohci_hub_status_data, + .hub_control = ohci_hub_control, +}; + +/*-------------------------------------------------------------------------*/ + +static int ohci_hcd_au1xxx_drv_probe(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + int ret; + + pr_debug ("In ohci_hcd_au1xxx_drv_probe"); + + if (usb_disabled()) + return -ENODEV; + + ret = usb_hcd_au1xxx_probe(&ohci_au1xxx_hc_driver, pdev); + return ret; +} + +static int ohci_hcd_au1xxx_drv_remove(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct usb_hcd *hcd = dev_get_drvdata(dev); + + usb_hcd_au1xxx_remove(hcd, pdev); + return 0; +} + /*TBD*/ +/*static int ohci_hcd_au1xxx_drv_suspend(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct usb_hcd *hcd = dev_get_drvdata(dev); + + return 0; +} +static int ohci_hcd_au1xxx_drv_resume(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct usb_hcd *hcd = dev_get_drvdata(dev); + + return 0; +} +*/ + +static struct device_driver ohci_hcd_au1xxx_driver = { + .name = "au1xxx-ohci", + .bus = &platform_bus_type, + .probe = ohci_hcd_au1xxx_drv_probe, + .remove = ohci_hcd_au1xxx_drv_remove, + /*.suspend = ohci_hcd_au1xxx_drv_suspend, */ + /*.resume = ohci_hcd_au1xxx_drv_resume, */ +}; + +static int __init ohci_hcd_au1xxx_init (void) +{ + pr_debug (DRIVER_INFO " (Au1xxx)"); + pr_debug ("block sizes: ed %d td %d\n", + sizeof (struct ed), sizeof (struct td)); + + return driver_register(&ohci_hcd_au1xxx_driver); +} + +static void __exit ohci_hcd_au1xxx_cleanup (void) +{ + driver_unregister(&ohci_hcd_au1xxx_driver); +} + +module_init (ohci_hcd_au1xxx_init); +module_exit (ohci_hcd_au1xxx_cleanup); |