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authorJan Andersson <jan@gaisler.com>2011-05-06 14:00:18 +0400
committerGreg Kroah-Hartman <gregkh@suse.de>2011-05-07 05:24:02 +0400
commit3db7739c80990ef53621f76f6095a91e70d88546 (patch)
tree334f92bdf51969eb4d7e4daa7dc48f63a421fc5c /drivers/usb/host/uhci-grlib.c
parentd3219d1c4c9ab7cd959f8f294420faf5f936cf55 (diff)
downloadlinux-3db7739c80990ef53621f76f6095a91e70d88546.tar.xz
USB: UHCI: Add support for GRLIB GRUSBHC controller
This patch adds support for the UHCI part of the GRLIB GRUSBHC controller found on some LEON/GRLIB SoCs. The UHCI HCD previously only supported controllers connected over PCI. This patch adds support for the first non-PCI UHCI HC. I have tried to replicate the solution used in ehci-hcd.c. Tested on GR-LEON4-ITX board (LEON4/GRLIB with GRUSBHC) and x86 with Intel UHCI HC. Signed-off-by: Jan Andersson <jan@gaisler.com> Acked-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/host/uhci-grlib.c')
-rw-r--r--drivers/usb/host/uhci-grlib.c194
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 000000000000..b1addd60a1ef
--- /dev/null
+++ b/drivers/usb/host/uhci-grlib.c
@@ -0,0 +1,194 @@
+/*
+ * 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/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);
+
+ 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_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 __devinit 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 = res.end - res.start + 1;
+
+ 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;
+ }
+
+ uhci = hcd_to_uhci(hcd);
+
+ uhci->regs = hcd->regs;
+
+ rv = usb_add_hcd(hcd, irq, 0);
+ if (rv)
+ goto err_uhci;
+
+ return 0;
+
+err_uhci:
+ 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 uhci_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 UHCI 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;
+}
+
+/* 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 = dev_get_drvdata(&op->dev);
+
+ 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",
+ .owner = THIS_MODULE,
+ .of_match_table = uhci_hcd_grlib_of_match,
+ },
+};