diff options
Diffstat (limited to 'drivers/usb/host/ehci-ppc-soc.c')
| -rw-r--r-- | drivers/usb/host/ehci-ppc-soc.c | 182 |
1 files changed, 182 insertions, 0 deletions
diff --git a/drivers/usb/host/ehci-ppc-soc.c b/drivers/usb/host/ehci-ppc-soc.c new file mode 100644 index 00000000000..c2cedb09ed8 --- /dev/null +++ b/drivers/usb/host/ehci-ppc-soc.c @@ -0,0 +1,182 @@ +/* + * EHCI HCD (Host Controller Driver) for USB. + * + * (C) Copyright 2006-2007 Stefan Roese <sr@denx.de>, DENX Software Engineering + * + * Bus Glue for PPC On-Chip EHCI driver + * Tested on AMCC 440EPx + * + * Based on "ehci-au12xx.c" by David Brownell <dbrownell@users.sourceforge.net> + * + * This file is licenced under the GPL. + */ + +#include <linux/platform_device.h> + +extern int usb_disabled(void); + +/** + * usb_ehci_ppc_soc_probe - initialize PPC-SoC-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_ehci_ppc_soc_probe(const struct hc_driver *driver, + struct usb_hcd **hcd_out, + struct platform_device *dev) +{ + int retval; + struct usb_hcd *hcd; + struct ehci_hcd *ehci; + + if (dev->resource[1].flags != IORESOURCE_IRQ) { + pr_debug("resource[1] is not IORESOURCE_IRQ"); + retval = -ENOMEM; + } + hcd = usb_create_hcd(driver, &dev->dev, "PPC-SOC EHCI"); + 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; + } + + ehci = hcd_to_ehci(hcd); + ehci->big_endian_mmio = 1; + ehci->big_endian_desc = 1; + ehci->caps = hcd->regs; + ehci->regs = hcd->regs + HC_LENGTH(ehci_readl(ehci, &ehci->caps->hc_capbase)); + + /* cache this readonly data; minimize chip reads */ + ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params); + +#if defined(CONFIG_440EPX) + /* + * 440EPx Errata USBH_3 + * Fix: Enable Break Memory Transfer (BMT) in INSNREG3 + */ + out_be32((void *)((ulong)(&ehci->regs->command) + 0x8c), (1 << 0)); + ehci_dbg(ehci, "Break Memory Transfer (BMT) has beed enabled!\n"); +#endif + + retval = usb_add_hcd(hcd, dev->resource[1].start, IRQF_DISABLED); + if (retval == 0) + return retval; + + 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_ehci_hcd_ppc_soc_remove - shutdown processing for PPC-SoC-based HCDs + * @dev: USB Host Controller being removed + * Context: !in_interrupt() + * + * Reverses the effect of usb_ehci_hcd_ppc_soc_probe(), first invoking + * the HCD's stop() method. It is always called from a thread + * context, normally "rmmod", "apmd", or something similar. + * + */ +void usb_ehci_ppc_soc_remove(struct usb_hcd *hcd, struct platform_device *dev) +{ + usb_remove_hcd(hcd); + iounmap(hcd->regs); + release_mem_region(hcd->rsrc_start, hcd->rsrc_len); + usb_put_hcd(hcd); +} + +static const struct hc_driver ehci_ppc_soc_hc_driver = { + .description = hcd_name, + .product_desc = "PPC-SOC EHCI", + .hcd_priv_size = sizeof(struct ehci_hcd), + + /* + * generic hardware linkage + */ + .irq = ehci_irq, + .flags = HCD_MEMORY | HCD_USB2, + + /* + * basic lifecycle operations + */ + .reset = ehci_init, + .start = ehci_run, + .stop = ehci_stop, + .shutdown = ehci_shutdown, + + /* + * managing i/o requests and associated device resources + */ + .urb_enqueue = ehci_urb_enqueue, + .urb_dequeue = ehci_urb_dequeue, + .endpoint_disable = ehci_endpoint_disable, + + /* + * scheduling support + */ + .get_frame_number = ehci_get_frame, + + /* + * root hub support + */ + .hub_status_data = ehci_hub_status_data, + .hub_control = ehci_hub_control, +#ifdef CONFIG_PM + .hub_suspend = ehci_hub_suspend, + .hub_resume = ehci_hub_resume, +#endif +}; + +static int ehci_hcd_ppc_soc_drv_probe(struct platform_device *pdev) +{ + struct usb_hcd *hcd = NULL; + int ret; + + pr_debug("In ehci_hcd_ppc_soc_drv_probe\n"); + + if (usb_disabled()) + return -ENODEV; + + ret = usb_ehci_ppc_soc_probe(&ehci_ppc_soc_hc_driver, &hcd, pdev); + return ret; +} + +static int ehci_hcd_ppc_soc_drv_remove(struct platform_device *pdev) +{ + struct usb_hcd *hcd = platform_get_drvdata(pdev); + + usb_ehci_ppc_soc_remove(hcd, pdev); + return 0; +} + +MODULE_ALIAS("ppc-soc-ehci"); +static struct platform_driver ehci_ppc_soc_driver = { + .probe = ehci_hcd_ppc_soc_drv_probe, + .remove = ehci_hcd_ppc_soc_drv_remove, + .shutdown = usb_hcd_platform_shutdown, + .driver = { + .name = "ppc-soc-ehci", + .bus = &platform_bus_type + } +}; |