180 lines
3.8 KiB
C
180 lines
3.8 KiB
C
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// SPDX-License-Identifier: GPL-2.0+
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/*
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* Driver for Aeroflex Gaisler GRLIB GRUSBHC EHCI host controller
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*
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* GRUSBHC is typically found on LEON/GRLIB SoCs
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*
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* (c) Jan Andersson <jan@gaisler.com>
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*
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* Based on ehci-ppc-of.c which is:
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* (c) Valentine Barshak <vbarshak@ru.mvista.com>
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* and in turn based on "ehci-ppc-soc.c" by Stefan Roese <sr@denx.de>
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* and "ohci-ppc-of.c" by Sylvain Munaut <tnt@246tNt.com>
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*/
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#include <linux/err.h>
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#include <linux/signal.h>
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#include <linux/of_irq.h>
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#include <linux/of_address.h>
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#include <linux/of_platform.h>
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#define GRUSBHC_HCIVERSION 0x0100 /* Known value of cap. reg. HCIVERSION */
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static const struct hc_driver ehci_grlib_hc_driver = {
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.description = hcd_name,
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.product_desc = "GRLIB GRUSBHC EHCI",
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.hcd_priv_size = sizeof(struct ehci_hcd),
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/*
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* generic hardware linkage
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*/
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.irq = ehci_irq,
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.flags = HCD_MEMORY | HCD_DMA | HCD_USB2 | HCD_BH,
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/*
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* basic lifecycle operations
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*/
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.reset = ehci_setup,
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.start = ehci_run,
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.stop = ehci_stop,
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.shutdown = ehci_shutdown,
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/*
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* managing i/o requests and associated device resources
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*/
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.urb_enqueue = ehci_urb_enqueue,
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.urb_dequeue = ehci_urb_dequeue,
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.endpoint_disable = ehci_endpoint_disable,
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.endpoint_reset = ehci_endpoint_reset,
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/*
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* scheduling support
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*/
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.get_frame_number = ehci_get_frame,
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/*
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* root hub support
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*/
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.hub_status_data = ehci_hub_status_data,
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.hub_control = ehci_hub_control,
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#ifdef CONFIG_PM
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.bus_suspend = ehci_bus_suspend,
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.bus_resume = ehci_bus_resume,
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#endif
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.relinquish_port = ehci_relinquish_port,
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.port_handed_over = ehci_port_handed_over,
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.clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
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};
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static int ehci_hcd_grlib_probe(struct platform_device *op)
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{
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struct device_node *dn = op->dev.of_node;
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struct usb_hcd *hcd;
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struct ehci_hcd *ehci = NULL;
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struct resource res;
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u32 hc_capbase;
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int irq;
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int rv;
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if (usb_disabled())
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return -ENODEV;
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dev_dbg(&op->dev, "initializing GRUSBHC EHCI USB Controller\n");
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rv = of_address_to_resource(dn, 0, &res);
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if (rv)
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return rv;
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/* usb_create_hcd requires dma_mask != NULL */
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op->dev.dma_mask = &op->dev.coherent_dma_mask;
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hcd = usb_create_hcd(&ehci_grlib_hc_driver, &op->dev,
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"GRUSBHC EHCI USB");
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if (!hcd)
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return -ENOMEM;
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hcd->rsrc_start = res.start;
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hcd->rsrc_len = resource_size(&res);
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irq = irq_of_parse_and_map(dn, 0);
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if (!irq) {
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dev_err(&op->dev, "%s: irq_of_parse_and_map failed\n",
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__FILE__);
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rv = -EBUSY;
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goto err_irq;
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}
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hcd->regs = devm_ioremap_resource(&op->dev, &res);
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if (IS_ERR(hcd->regs)) {
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rv = PTR_ERR(hcd->regs);
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goto err_ioremap;
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}
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ehci = hcd_to_ehci(hcd);
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ehci->caps = hcd->regs;
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/* determine endianness of this implementation */
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hc_capbase = ehci_readl(ehci, &ehci->caps->hc_capbase);
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if (HC_VERSION(ehci, hc_capbase) != GRUSBHC_HCIVERSION) {
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ehci->big_endian_mmio = 1;
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ehci->big_endian_desc = 1;
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ehci->big_endian_capbase = 1;
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}
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rv = usb_add_hcd(hcd, irq, 0);
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if (rv)
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goto err_ioremap;
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device_wakeup_enable(hcd->self.controller);
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return 0;
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err_ioremap:
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irq_dispose_mapping(irq);
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err_irq:
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usb_put_hcd(hcd);
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return rv;
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}
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static int ehci_hcd_grlib_remove(struct platform_device *op)
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{
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struct usb_hcd *hcd = platform_get_drvdata(op);
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dev_dbg(&op->dev, "stopping GRLIB GRUSBHC EHCI USB Controller\n");
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usb_remove_hcd(hcd);
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irq_dispose_mapping(hcd->irq);
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usb_put_hcd(hcd);
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return 0;
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}
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static const struct of_device_id ehci_hcd_grlib_of_match[] = {
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{
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.name = "GAISLER_EHCI",
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},
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{
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.name = "01_026",
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},
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{},
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};
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MODULE_DEVICE_TABLE(of, ehci_hcd_grlib_of_match);
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static struct platform_driver ehci_grlib_driver = {
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.probe = ehci_hcd_grlib_probe,
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.remove = ehci_hcd_grlib_remove,
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.shutdown = usb_hcd_platform_shutdown,
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.driver = {
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.name = "grlib-ehci",
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.of_match_table = ehci_hcd_grlib_of_match,
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},
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};
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