/* * EHCI HCD (Host Controller Driver) for USB. * * Bus Glue for PPC On-Chip EHCI driver on the of_platform bus * Tested on AMCC PPC 440EPx * * Valentine Barshak <vbarshak@ru.mvista.com> * * Based on "ehci-ppc-soc.c" by Stefan Roese <sr@denx.de> * and "ohci-ppc-of.c" by Sylvain Munaut <tnt@246tNt.com> * * This file is licenced under the GPL. */ #include <linux/signal.h> #include <linux/of.h> #include <linux/of_platform.h> /* called during probe() after chip reset completes */ static int ehci_ppc_of_setup(struct usb_hcd *hcd) { struct ehci_hcd *ehci = hcd_to_ehci(hcd); int retval; retval = ehci_halt(ehci); if (retval) return retval; retval = ehci_init(hcd); if (retval) return retval; ehci->sbrn = 0x20; return ehci_reset(ehci); } static const struct hc_driver ehci_ppc_of_hc_driver = { .description = hcd_name, .product_desc = "OF EHCI", .hcd_priv_size = sizeof(struct ehci_hcd), /* * generic hardware linkage */ .irq = ehci_irq, .flags = HCD_MEMORY | HCD_USB2, /* * basic lifecycle operations */ .reset = ehci_ppc_of_setup, .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 .bus_suspend = ehci_bus_suspend, .bus_resume = ehci_bus_resume, #endif .relinquish_port = ehci_relinquish_port, .port_handed_over = ehci_port_handed_over, }; /* * 440EPx Errata USBH_3 * Fix: Enable Break Memory Transfer (BMT) in INSNREG3 */ #define PPC440EPX_EHCI0_INSREG_BMT (0x1 << 0) static int __devinit ppc44x_enable_bmt(struct device_node *dn) { __iomem u32 *insreg_virt; insreg_virt = of_iomap(dn, 1); if (!insreg_virt) return -EINVAL; out_be32(insreg_virt + 3, PPC440EPX_EHCI0_INSREG_BMT); iounmap(insreg_virt); return 0; } static int __devinit ehci_hcd_ppc_of_probe(struct of_device *op, const struct of_device_id *match) { struct device_node *dn = op->node; struct usb_hcd *hcd; struct ehci_hcd *ehci; struct resource res; int irq; int rv; if (usb_disabled()) return -ENODEV; dev_dbg(&op->dev, "initializing PPC-OF USB Controller\n"); rv = of_address_to_resource(dn, 0, &res); if (rv) return rv; hcd = usb_create_hcd(&ehci_ppc_of_hc_driver, &op->dev, "PPC-OF USB"); if (!hcd) return -ENOMEM; hcd->rsrc_start = res.start; hcd->rsrc_len = res.end - res.start + 1; if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) { printk(KERN_ERR __FILE__ ": request_mem_region failed\n"); rv = -EBUSY; goto err_rmr; } irq = irq_of_parse_and_map(dn, 0); if (irq == NO_IRQ) { printk(KERN_ERR __FILE__ ": irq_of_parse_and_map failed\n"); rv = -EBUSY; goto err_irq; } hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len); if (!hcd->regs) { printk(KERN_ERR __FILE__ ": ioremap failed\n"); rv = -ENOMEM; goto err_ioremap; } ehci = hcd_to_ehci(hcd); if (of_get_property(dn, "big-endian", NULL)) { ehci->big_endian_mmio = 1; ehci->big_endian_desc = 1; } if (of_get_property(dn, "big-endian-regs", NULL)) ehci->big_endian_mmio = 1; if (of_get_property(dn, "big-endian-desc", NULL)) 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 (of_device_is_compatible(dn, "ibm,usb-ehci-440epx")) { rv = ppc44x_enable_bmt(dn); ehci_dbg(ehci, "Break Memory Transfer (BMT) is %senabled!\n", rv ? "NOT ": ""); } rv = usb_add_hcd(hcd, irq, 0); if (rv == 0) return 0; iounmap(hcd->regs); err_ioremap: irq_dispose_mapping(irq); err_irq: release_mem_region(hcd->rsrc_start, hcd->rsrc_len); err_rmr: usb_put_hcd(hcd); return rv; } static int ehci_hcd_ppc_of_remove(struct of_device *op) { struct usb_hcd *hcd = dev_get_drvdata(&op->dev); dev_set_drvdata(&op->dev, NULL); dev_dbg(&op->dev, "stopping PPC-OF USB Controller\n"); usb_remove_hcd(hcd); iounmap(hcd->regs); irq_dispose_mapping(hcd->irq); release_mem_region(hcd->rsrc_start, hcd->rsrc_len); usb_put_hcd(hcd); return 0; } static int ehci_hcd_ppc_of_shutdown(struct of_device *op) { struct usb_hcd *hcd = dev_get_drvdata(&op->dev); if (hcd->driver->shutdown) hcd->driver->shutdown(hcd); return 0; } static struct of_device_id ehci_hcd_ppc_of_match[] = { { .compatible = "usb-ehci", }, {}, }; MODULE_DEVICE_TABLE(of, ehci_hcd_ppc_of_match); static struct of_platform_driver ehci_hcd_ppc_of_driver = { .name = "ppc-of-ehci", .match_table = ehci_hcd_ppc_of_match, .probe = ehci_hcd_ppc_of_probe, .remove = ehci_hcd_ppc_of_remove, .shutdown = ehci_hcd_ppc_of_shutdown, .driver = { .name = "ppc-of-ehci", .owner = THIS_MODULE, }, };