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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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+ * This program is free software; you can redistribute it and/or modify it
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+ * under the terms of the GNU General Public License as published by the
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+ * Free Software Foundation; either version 2 of the License, or (at your
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+ * option) any later version.
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+ *
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+ * This program is distributed in the hope that it will be useful, but
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+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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+ * for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License
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+ * along with this program; if not, write to the Free Software Foundation,
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+ * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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+ */
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+
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+
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+#include <linux/signal.h>
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+
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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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+
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+#define GRUSBHC_HCIVERSION 0x0100 /* Known value of cap. reg. HCIVERSION */
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+
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+/* called during probe() after chip reset completes */
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+static int ehci_grlib_setup(struct usb_hcd *hcd)
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+{
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+ struct ehci_hcd *ehci = hcd_to_ehci(hcd);
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+ int retval;
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+
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+ retval = ehci_halt(ehci);
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+ if (retval)
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+ return retval;
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+
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+ retval = ehci_init(hcd);
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+ if (retval)
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+ return retval;
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+
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+ ehci->sbrn = 0x20;
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+ ehci_port_power(ehci, 1);
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+
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+ return ehci_reset(ehci);
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+}
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+
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+
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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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+ /*
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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_USB2,
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+
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+ /*
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+ * basic lifecycle operations
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+ */
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+ .reset = ehci_grlib_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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+ /*
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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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+ /*
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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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+ /*
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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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+
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+ .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
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+};
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+
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+
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+static int __devinit 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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+
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+ if (usb_disabled())
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+ return -ENODEV;
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+
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+ dev_dbg(&op->dev, "initializing GRUSBHC EHCI USB Controller\n");
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+
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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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+
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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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+
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+ hcd->rsrc_start = res.start;
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+ hcd->rsrc_len = res.end - res.start + 1;
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+
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+ if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
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+ printk(KERN_ERR "%s: request_mem_region failed\n", __FILE__);
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+ rv = -EBUSY;
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+ goto err_rmr;
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+ }
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+
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+ irq = irq_of_parse_and_map(dn, 0);
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+ if (irq == NO_IRQ) {
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+ printk(KERN_ERR "%s: irq_of_parse_and_map failed\n", __FILE__);
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+ rv = -EBUSY;
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+ goto err_irq;
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+ }
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+
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+ hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
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+ if (!hcd->regs) {
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+ printk(KERN_ERR "%s: ioremap failed\n", __FILE__);
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+ rv = -ENOMEM;
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+ goto err_ioremap;
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+ }
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+
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+ ehci = hcd_to_ehci(hcd);
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+
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+ ehci->caps = hcd->regs;
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+
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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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+
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+ ehci->regs = hcd->regs +
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+ HC_LENGTH(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase));
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+
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+ /* cache this readonly data; minimize chip reads */
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+ ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
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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_ehci;
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+
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+ return 0;
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+
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+err_ehci:
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+ iounmap(hcd->regs);
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+err_ioremap:
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+ irq_dispose_mapping(irq);
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+err_irq:
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+ release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
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+err_rmr:
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+ usb_put_hcd(hcd);
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+
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+ return rv;
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+}
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+
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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 = dev_get_drvdata(&op->dev);
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+
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+ dev_set_drvdata(&op->dev, NULL);
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+
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+ dev_dbg(&op->dev, "stopping GRLIB GRUSBHC EHCI USB Controller\n");
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+
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+ usb_remove_hcd(hcd);
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+
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+ iounmap(hcd->regs);
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+ irq_dispose_mapping(hcd->irq);
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+ release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
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+
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+ usb_put_hcd(hcd);
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+
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+ return 0;
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+}
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+
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+
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+static void ehci_hcd_grlib_shutdown(struct platform_device *op)
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+{
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+ struct usb_hcd *hcd = dev_get_drvdata(&op->dev);
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+
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+ if (hcd->driver->shutdown)
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+ hcd->driver->shutdown(hcd);
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+}
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+
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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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+
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+
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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 = ehci_hcd_grlib_shutdown,
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+ .driver = {
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+ .name = "grlib-ehci",
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+ .owner = THIS_MODULE,
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+ .of_match_table = ehci_hcd_grlib_of_match,
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+ },
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+};
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Jan Andersson