| // SPDX-License-Identifier: GPL-1.0+ |
| /* |
| * 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 |
| * (C) Copyright 2006 Sylvain Munaut <tnt@246tNt.com> |
| * |
| * Bus glue for OHCI HC on the of_platform bus |
| * |
| * Modified for of_platform bus from ohci-sa1111.c |
| * |
| * This file is licenced under the GPL. |
| */ |
| |
| #include <linux/signal.h> |
| #include <linux/of_address.h> |
| #include <linux/of_irq.h> |
| #include <linux/of_platform.h> |
| |
| #include <asm/prom.h> |
| |
| |
| static int |
| ohci_ppc_of_start(struct usb_hcd *hcd) |
| { |
| struct ohci_hcd *ohci = hcd_to_ohci(hcd); |
| int ret; |
| |
| if ((ret = ohci_init(ohci)) < 0) |
| return ret; |
| |
| if ((ret = ohci_run(ohci)) < 0) { |
| dev_err(hcd->self.controller, "can't start %s\n", |
| hcd->self.bus_name); |
| ohci_stop(hcd); |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| static const struct hc_driver ohci_ppc_of_hc_driver = { |
| .description = hcd_name, |
| .product_desc = "OF OHCI", |
| .hcd_priv_size = sizeof(struct ohci_hcd), |
| |
| /* |
| * generic hardware linkage |
| */ |
| .irq = ohci_irq, |
| .flags = HCD_USB11 | HCD_MEMORY, |
| |
| /* |
| * basic lifecycle operations |
| */ |
| .start = ohci_ppc_of_start, |
| .stop = ohci_stop, |
| .shutdown = ohci_shutdown, |
| |
| /* |
| * 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, |
| #ifdef CONFIG_PM |
| .bus_suspend = ohci_bus_suspend, |
| .bus_resume = ohci_bus_resume, |
| #endif |
| .start_port_reset = ohci_start_port_reset, |
| }; |
| |
| |
| static int ohci_hcd_ppc_of_probe(struct platform_device *op) |
| { |
| struct device_node *dn = op->dev.of_node; |
| struct usb_hcd *hcd; |
| struct ohci_hcd *ohci; |
| struct resource res; |
| int irq; |
| |
| int rv; |
| int is_bigendian; |
| struct device_node *np; |
| |
| if (usb_disabled()) |
| return -ENODEV; |
| |
| is_bigendian = |
| of_device_is_compatible(dn, "ohci-bigendian") || |
| of_device_is_compatible(dn, "ohci-be"); |
| |
| 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(&ohci_ppc_of_hc_driver, &op->dev, "PPC-OF USB"); |
| if (!hcd) |
| return -ENOMEM; |
| |
| hcd->rsrc_start = res.start; |
| hcd->rsrc_len = resource_size(&res); |
| |
| hcd->regs = devm_ioremap_resource(&op->dev, &res); |
| if (IS_ERR(hcd->regs)) { |
| rv = PTR_ERR(hcd->regs); |
| goto err_rmr; |
| } |
| |
| irq = irq_of_parse_and_map(dn, 0); |
| if (irq == NO_IRQ) { |
| dev_err(&op->dev, "%s: irq_of_parse_and_map failed\n", |
| __FILE__); |
| rv = -EBUSY; |
| goto err_rmr; |
| } |
| |
| ohci = hcd_to_ohci(hcd); |
| if (is_bigendian) { |
| ohci->flags |= OHCI_QUIRK_BE_MMIO | OHCI_QUIRK_BE_DESC; |
| if (of_device_is_compatible(dn, "fsl,mpc5200-ohci")) |
| ohci->flags |= OHCI_QUIRK_FRAME_NO; |
| if (of_device_is_compatible(dn, "mpc5200-ohci")) |
| ohci->flags |= OHCI_QUIRK_FRAME_NO; |
| } |
| |
| ohci_hcd_init(ohci); |
| |
| rv = usb_add_hcd(hcd, irq, 0); |
| if (rv == 0) { |
| device_wakeup_enable(hcd->self.controller); |
| return 0; |
| } |
| |
| /* by now, 440epx is known to show usb_23 erratum */ |
| np = of_find_compatible_node(NULL, NULL, "ibm,usb-ehci-440epx"); |
| |
| /* Work around - At this point ohci_run has executed, the |
| * controller is running, everything, the root ports, etc., is |
| * set up. If the ehci driver is loaded, put the ohci core in |
| * the suspended state. The ehci driver will bring it out of |
| * suspended state when / if a non-high speed USB device is |
| * attached to the USB Host port. If the ehci driver is not |
| * loaded, do nothing. request_mem_region is used to test if |
| * the ehci driver is loaded. |
| */ |
| if (np != NULL) { |
| if (!of_address_to_resource(np, 0, &res)) { |
| if (!request_mem_region(res.start, 0x4, hcd_name)) { |
| writel_be((readl_be(&ohci->regs->control) | |
| OHCI_USB_SUSPEND), &ohci->regs->control); |
| (void) readl_be(&ohci->regs->control); |
| } else |
| release_mem_region(res.start, 0x4); |
| } else |
| pr_debug("%s: cannot get ehci offset from fdt\n", __FILE__); |
| } |
| |
| irq_dispose_mapping(irq); |
| err_rmr: |
| usb_put_hcd(hcd); |
| |
| return rv; |
| } |
| |
| static int ohci_hcd_ppc_of_remove(struct platform_device *op) |
| { |
| struct usb_hcd *hcd = platform_get_drvdata(op); |
| |
| dev_dbg(&op->dev, "stopping PPC-OF USB Controller\n"); |
| |
| usb_remove_hcd(hcd); |
| |
| irq_dispose_mapping(hcd->irq); |
| |
| usb_put_hcd(hcd); |
| |
| return 0; |
| } |
| |
| static const struct of_device_id ohci_hcd_ppc_of_match[] = { |
| #ifdef CONFIG_USB_OHCI_HCD_PPC_OF_BE |
| { |
| .name = "usb", |
| .compatible = "ohci-bigendian", |
| }, |
| { |
| .name = "usb", |
| .compatible = "ohci-be", |
| }, |
| #endif |
| #ifdef CONFIG_USB_OHCI_HCD_PPC_OF_LE |
| { |
| .name = "usb", |
| .compatible = "ohci-littledian", |
| }, |
| { |
| .name = "usb", |
| .compatible = "ohci-le", |
| }, |
| #endif |
| {}, |
| }; |
| MODULE_DEVICE_TABLE(of, ohci_hcd_ppc_of_match); |
| |
| #if !defined(CONFIG_USB_OHCI_HCD_PPC_OF_BE) && \ |
| !defined(CONFIG_USB_OHCI_HCD_PPC_OF_LE) |
| #error "No endianness selected for ppc-of-ohci" |
| #endif |
| |
| |
| static struct platform_driver ohci_hcd_ppc_of_driver = { |
| .probe = ohci_hcd_ppc_of_probe, |
| .remove = ohci_hcd_ppc_of_remove, |
| .shutdown = usb_hcd_platform_shutdown, |
| .driver = { |
| .name = "ppc-of-ohci", |
| .of_match_table = ohci_hcd_ppc_of_match, |
| }, |
| }; |
| |