diff options
Diffstat (limited to 'drivers/usb/host/uhci-grlib.c')
| -rw-r--r-- | drivers/usb/host/uhci-grlib.c | 194 |
1 files changed, 194 insertions, 0 deletions
diff --git a/drivers/usb/host/uhci-grlib.c b/drivers/usb/host/uhci-grlib.c new file mode 100644 index 000000000..0a201a73b --- /dev/null +++ b/drivers/usb/host/uhci-grlib.c @@ -0,0 +1,194 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * UHCI HCD (Host Controller Driver) for GRLIB GRUSBHC + * + * Copyright (c) 2011 Jan Andersson <jan@gaisler.com> + * + * This file is based on UHCI PCI HCD: + * (C) Copyright 1999 Linus Torvalds + * (C) Copyright 1999-2002 Johannes Erdfelt, johannes@erdfelt.com + * (C) Copyright 1999 Randy Dunlap + * (C) Copyright 1999 Georg Acher, acher@in.tum.de + * (C) Copyright 1999 Deti Fliegl, deti@fliegl.de + * (C) Copyright 1999 Thomas Sailer, sailer@ife.ee.ethz.ch + * (C) Copyright 1999 Roman Weissgaerber, weissg@vienna.at + * (C) Copyright 2000 Yggdrasil Computing, Inc. (port of new PCI interface + * support from usb-ohci.c by Adam Richter, adam@yggdrasil.com). + * (C) Copyright 1999 Gregory P. Smith (from usb-ohci.c) + * (C) Copyright 2004-2007 Alan Stern, stern@rowland.harvard.edu + */ + +#include <linux/device.h> +#include <linux/of_irq.h> +#include <linux/of_address.h> +#include <linux/of_platform.h> + +static int uhci_grlib_init(struct usb_hcd *hcd) +{ + struct uhci_hcd *uhci = hcd_to_uhci(hcd); + + /* + * Probe to determine the endianness of the controller. + * We know that bit 7 of the PORTSC1 register is always set + * and bit 15 is always clear. If uhci_readw() yields a value + * with bit 7 (0x80) turned on then the current little-endian + * setting is correct. Otherwise we assume the value was + * byte-swapped; hence the register interface and presumably + * also the descriptors are big-endian. + */ + if (!(uhci_readw(uhci, USBPORTSC1) & 0x80)) { + uhci->big_endian_mmio = 1; + uhci->big_endian_desc = 1; + } + + uhci->rh_numports = uhci_count_ports(hcd); + + /* Set up pointers to to generic functions */ + uhci->reset_hc = uhci_generic_reset_hc; + uhci->check_and_reset_hc = uhci_generic_check_and_reset_hc; + /* No special actions need to be taken for the functions below */ + uhci->configure_hc = NULL; + uhci->resume_detect_interrupts_are_broken = NULL; + uhci->global_suspend_mode_is_broken = NULL; + + /* Reset if the controller isn't already safely quiescent. */ + check_and_reset_hc(uhci); + return 0; +} + +static const struct hc_driver uhci_grlib_hc_driver = { + .description = hcd_name, + .product_desc = "GRLIB GRUSBHC UHCI Host Controller", + .hcd_priv_size = sizeof(struct uhci_hcd), + + /* Generic hardware linkage */ + .irq = uhci_irq, + .flags = HCD_MEMORY | HCD_DMA | HCD_USB11, + + /* Basic lifecycle operations */ + .reset = uhci_grlib_init, + .start = uhci_start, +#ifdef CONFIG_PM + .pci_suspend = NULL, + .pci_resume = NULL, + .bus_suspend = uhci_rh_suspend, + .bus_resume = uhci_rh_resume, +#endif + .stop = uhci_stop, + + .urb_enqueue = uhci_urb_enqueue, + .urb_dequeue = uhci_urb_dequeue, + + .endpoint_disable = uhci_hcd_endpoint_disable, + .get_frame_number = uhci_hcd_get_frame_number, + + .hub_status_data = uhci_hub_status_data, + .hub_control = uhci_hub_control, +}; + + +static int uhci_hcd_grlib_probe(struct platform_device *op) +{ + struct device_node *dn = op->dev.of_node; + struct usb_hcd *hcd; + struct uhci_hcd *uhci = NULL; + struct resource res; + int irq; + int rv; + + if (usb_disabled()) + return -ENODEV; + + dev_dbg(&op->dev, "initializing GRUSBHC UHCI USB Controller\n"); + + rv = of_address_to_resource(dn, 0, &res); + if (rv) + return rv; + + /* usb_create_hcd requires dma_mask != NULL */ + op->dev.dma_mask = &op->dev.coherent_dma_mask; + hcd = usb_create_hcd(&uhci_grlib_hc_driver, &op->dev, + "GRUSBHC UHCI USB"); + if (!hcd) + return -ENOMEM; + + hcd->rsrc_start = res.start; + hcd->rsrc_len = resource_size(&res); + + irq = irq_of_parse_and_map(dn, 0); + if (irq == NO_IRQ) { + printk(KERN_ERR "%s: irq_of_parse_and_map failed\n", __FILE__); + rv = -EBUSY; + goto err_usb; + } + + hcd->regs = devm_ioremap_resource(&op->dev, &res); + if (IS_ERR(hcd->regs)) { + rv = PTR_ERR(hcd->regs); + goto err_irq; + } + + uhci = hcd_to_uhci(hcd); + + uhci->regs = hcd->regs; + + rv = usb_add_hcd(hcd, irq, 0); + if (rv) + goto err_irq; + + device_wakeup_enable(hcd->self.controller); + return 0; + +err_irq: + irq_dispose_mapping(irq); +err_usb: + usb_put_hcd(hcd); + + return rv; +} + +static int uhci_hcd_grlib_remove(struct platform_device *op) +{ + struct usb_hcd *hcd = platform_get_drvdata(op); + + dev_dbg(&op->dev, "stopping GRLIB GRUSBHC UHCI USB Controller\n"); + + usb_remove_hcd(hcd); + + irq_dispose_mapping(hcd->irq); + usb_put_hcd(hcd); + + return 0; +} + +/* Make sure the controller is quiescent and that we're not using it + * any more. This is mainly for the benefit of programs which, like kexec, + * expect the hardware to be idle: not doing DMA or generating IRQs. + * + * This routine may be called in a damaged or failing kernel. Hence we + * do not acquire the spinlock before shutting down the controller. + */ +static void uhci_hcd_grlib_shutdown(struct platform_device *op) +{ + struct usb_hcd *hcd = platform_get_drvdata(op); + + uhci_hc_died(hcd_to_uhci(hcd)); +} + +static const struct of_device_id uhci_hcd_grlib_of_match[] = { + { .name = "GAISLER_UHCI", }, + { .name = "01_027", }, + {}, +}; +MODULE_DEVICE_TABLE(of, uhci_hcd_grlib_of_match); + + +static struct platform_driver uhci_grlib_driver = { + .probe = uhci_hcd_grlib_probe, + .remove = uhci_hcd_grlib_remove, + .shutdown = uhci_hcd_grlib_shutdown, + .driver = { + .name = "grlib-uhci", + .of_match_table = uhci_hcd_grlib_of_match, + }, +}; |