/* * Driver for Aeroflex Gaisler GRLIB GRUSBHC EHCI host controller * * GRUSBHC is typically found on LEON/GRLIB SoCs * * (c) Jan Andersson <jan@gaisler.com> * * Based on ehci-ppc-of.c which is: * (c) Valentine Barshak <vbarshak@ru.mvista.com> * and in turn based on "ehci-ppc-soc.c" by Stefan Roese <sr@denx.de> * and "ohci-ppc-of.c" by Sylvain Munaut <tnt@246tNt.com> * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2 of the License, or (at your * option) any later version. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software Foundation, * Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include <linux/signal.h> #include <linux/of_irq.h> #include <linux/of_address.h> #include <linux/of_platform.h> #define GRUSBHC_HCIVERSION 0x0100 /* Known value of cap. reg. HCIVERSION */ /* called during probe() after chip reset completes */ static int ehci_grlib_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; ehci_port_power(ehci, 1); return ehci_reset(ehci); } static const struct hc_driver ehci_grlib_hc_driver = { .description = hcd_name, .product_desc = "GRLIB GRUSBHC EHCI", .hcd_priv_size = sizeof(struct ehci_hcd), /* * generic hardware linkage */ .irq = ehci_irq, .flags = HCD_MEMORY | HCD_USB2, /* * basic lifecycle operations */ .reset = ehci_grlib_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, .endpoint_reset = ehci_endpoint_reset, /* * 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, .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete, }; static int __devinit ehci_hcd_grlib_probe(struct platform_device *op) { struct device_node *dn = op->dev.of_node; struct usb_hcd *hcd; struct ehci_hcd *ehci = NULL; struct resource res; u32 hc_capbase; int irq; int rv; if (usb_disabled()) return -ENODEV; dev_dbg(&op->dev, "initializing GRUSBHC EHCI 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(&ehci_grlib_hc_driver, &op->dev, "GRUSBHC EHCI USB"); if (!hcd) return -ENOMEM; hcd->rsrc_start = res.start; hcd->rsrc_len = resource_size(&res); if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) { printk(KERN_ERR "%s: request_mem_region failed\n", __FILE__); rv = -EBUSY; goto err_rmr; } 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_irq; } hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len); if (!hcd->regs) { printk(KERN_ERR "%s: ioremap failed\n", __FILE__); rv = -ENOMEM; goto err_ioremap; } ehci = hcd_to_ehci(hcd); ehci->caps = hcd->regs; /* determine endianness of this implementation */ hc_capbase = ehci_readl(ehci, &ehci->caps->hc_capbase); if (HC_VERSION(ehci, hc_capbase) != GRUSBHC_HCIVERSION) { ehci->big_endian_mmio = 1; ehci->big_endian_desc = 1; ehci->big_endian_capbase = 1; } ehci->regs = hcd->regs + HC_LENGTH(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase)); /* cache this readonly data; minimize chip reads */ ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params); rv = usb_add_hcd(hcd, irq, 0); if (rv) goto err_ehci; return 0; err_ehci: 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_grlib_remove(struct platform_device *op) { struct usb_hcd *hcd = dev_get_drvdata(&op->dev); dev_set_drvdata(&op->dev, NULL); dev_dbg(&op->dev, "stopping GRLIB GRUSBHC EHCI 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 void ehci_hcd_grlib_shutdown(struct platform_device *op) { struct usb_hcd *hcd = dev_get_drvdata(&op->dev); if (hcd->driver->shutdown) hcd->driver->shutdown(hcd); } static const struct of_device_id ehci_hcd_grlib_of_match[] = { { .name = "GAISLER_EHCI", }, { .name = "01_026", }, {}, }; MODULE_DEVICE_TABLE(of, ehci_hcd_grlib_of_match); static struct platform_driver ehci_grlib_driver = { .probe = ehci_hcd_grlib_probe, .remove = ehci_hcd_grlib_remove, .shutdown = ehci_hcd_grlib_shutdown, .driver = { .name = "grlib-ehci", .owner = THIS_MODULE, .of_match_table = ehci_hcd_grlib_of_match, }, };