[PATCH] USB: ohci bits for the cirrus ep93xx

This patch adds OHCI glue bits for the USB host interface in the
Cirrus ep93xx (arm920t) CPU.

Signed-off-by: Lennert Buytenhek <buytenh@wantstofly.org>
Acked-by: David Brownell <david-b@pacbell.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 225 insertions, 0 deletions

diff --git a/drivers/usb/host/ohci-ep93xx.c b/drivers/usb/host/ohci-ep93xx.c
new file mode 100644
index 000000000000..6531c4d26527
--- /dev/null
+++ b/drivers/usb/host/ohci-ep93xx.c
@@ -0,0 +1,225 @@
+/*
+ * OHCI HCD (Host Controller Driver) for USB.
+ *
+ * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
+ * (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net>
+ * (C) Copyright 2002 Hewlett-Packard Company
+ *
+ * Bus Glue for ep93xx.
+ *
+ * Written by Christopher Hoover <ch@hpl.hp.com>
+ * Based on fragments of previous driver by Russell King et al.
+ *
+ * Modified for LH7A404 from ohci-sa1111.c
+ *  by Durgesh Pattamatta <pattamattad@sharpsec.com>
+ *
+ * Modified for pxa27x from ohci-lh7a404.c
+ *  by Nick Bane <nick@cecomputing.co.uk> 26-8-2004
+ *
+ * Modified for ep93xx from ohci-pxa27x.c
+ *  by Lennert Buytenhek <buytenh@wantstofly.org> 28-2-2006
+ *  Based on an earlier driver by Ray Lehtiniemi
+ *
+ * This file is licenced under the GPL.
+ */
+
+#include <linux/clk.h>
+#include <linux/device.h>
+#include <linux/signal.h>
+#include <linux/platform_device.h>
+
+#include <asm/mach-types.h>
+#include <asm/hardware.h>
+
+static struct clk *usb_host_clock;
+
+static void ep93xx_start_hc(struct device *dev)
+{
+        clk_enable(usb_host_clock);
+}
+
+static void ep93xx_stop_hc(struct device *dev)
+{
+        clk_disable(usb_host_clock);
+}
+
+static int usb_hcd_ep93xx_probe(const struct hc_driver *driver,
+                         struct platform_device *pdev)
+{
+        int retval;
+        struct usb_hcd *hcd;
+
+        if (pdev->resource[1].flags != IORESOURCE_IRQ) {
+                pr_debug("resource[1] is not IORESOURCE_IRQ");
+                return -ENOMEM;
+        }
+
+        hcd = usb_create_hcd(driver, &pdev->dev, "ep93xx");
+        if (hcd == NULL)
+                return -ENOMEM;
+
+        hcd->rsrc_start = pdev->resource[0].start;
+        hcd->rsrc_len = pdev->resource[0].end - pdev->resource[0].start + 1;
+        if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
+                usb_put_hcd(hcd);
+                retval = -EBUSY;
+                goto err1;
+        }
+
+        hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
+        if (hcd->regs == NULL) {
+                pr_debug("ioremap failed");
+                retval = -ENOMEM;
+                goto err2;
+        }
+
+        usb_host_clock = clk_get(&pdev->dev, "usb_host");
+        ep93xx_start_hc(&pdev->dev);
+
+        ohci_hcd_init(hcd_to_ohci(hcd));
+
+        retval = usb_add_hcd(hcd, pdev->resource[1].start, SA_INTERRUPT);
+        if (retval == 0)
+                return retval;
+
+        ep93xx_stop_hc(&pdev->dev);
+        iounmap(hcd->regs);
+err2:
+        release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
+err1:
+        usb_put_hcd(hcd);
+
+        return retval;
+}
+
+static void usb_hcd_ep93xx_remove(struct usb_hcd *hcd,
+                        struct platform_device *pdev)
+{
+        usb_remove_hcd(hcd);
+        ep93xx_stop_hc(&pdev->dev);
+        clk_put(usb_host_clock);
+        iounmap(hcd->regs);
+        release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
+        usb_put_hcd(hcd);
+}
+
+static int __devinit ohci_ep93xx_start(struct usb_hcd *hcd)
+{
+        struct ohci_hcd *ohci = hcd_to_ohci(hcd);
+        int ret;
+
+        if ((ret = ohci_init(ohci)) < 0)
+                return ret;
+
+        if ((ret = ohci_run(ohci)) < 0) {
+                err("can't start %s", hcd->self.bus_name);
+                ohci_stop(hcd);
+                return ret;
+        }
+
+        return 0;
+}
+
+static struct hc_driver ohci_ep93xx_hc_driver = {
+        .description            = hcd_name,
+        .product_desc           = "EP93xx OHCI",
+        .hcd_priv_size          = sizeof(struct ohci_hcd),
+        .irq                    = ohci_irq,
+        .flags                  = HCD_USB11 | HCD_MEMORY,
+        .start                  = ohci_ep93xx_start,
+        .stop                   = ohci_stop,
+        .urb_enqueue            = ohci_urb_enqueue,
+        .urb_dequeue            = ohci_urb_dequeue,
+        .endpoint_disable       = ohci_endpoint_disable,
+        .get_frame_number       = ohci_get_frame,
+        .hub_status_data        = ohci_hub_status_data,
+        .hub_control            = ohci_hub_control,
+#ifdef CONFIG_PM
+        .bus_suspend            = ohci_bus_suspend,
+        .bus_resume             = ohci_bus_resume,
+#endif
+        .start_port_reset       = ohci_start_port_reset,
+};
+
+extern int usb_disabled(void);
+
+static int ohci_hcd_ep93xx_drv_probe(struct platform_device *pdev)
+{
+        int ret;
+
+        ret = -ENODEV;
+        if (!usb_disabled())
+                ret = usb_hcd_ep93xx_probe(&ohci_ep93xx_hc_driver, pdev);
+
+        return ret;
+}
+
+static int ohci_hcd_ep93xx_drv_remove(struct platform_device *pdev)
+{
+        struct usb_hcd *hcd = platform_get_drvdata(pdev);
+
+        usb_hcd_ep93xx_remove(hcd, pdev);
+
+        return 0;
+}
+
+#ifdef CONFIG_PM
+static int ohci_hcd_ep93xx_drv_suspend(struct platform_device *pdev, pm_message_t state)
+{
+        struct usb_hcd *hcd = platform_get_drvdata(pdev);
+        struct ochi_hcd *ohci = hcd_to_ohci(hcd);
+
+        if (time_before(jiffies, ohci->next_statechange))
+                msleep(5);
+        ohci->next_statechange = jiffies;
+
+        ep93xx_stop_hc(&pdev->dev);
+        hcd->state = HC_STATE_SUSPENDED;
+        pdev->dev.power.power_state = PMSG_SUSPEND;
+
+        return 0;
+}
+
+static int ohci_hcd_ep93xx_drv_resume(struct platform_device *pdev)
+{
+        struct usb_hcd *hcd = platform_get_drvdata(pdev);
+        struct ohci_hcd *ohci = hcd_to_ohci(hcd);
+        int status;
+
+        if (time_before(jiffies, ohci->next_statechange))
+                msleep(5);
+        ohci->next_statechange = jiffies;
+
+        ep93xx_start_hc(&pdev->dev);
+        pdev->dev.power.power_state = PMSG_ON;
+        usb_hcd_resume_root_hub(hcd);
+
+        return 0;
+}
+#endif
+
+
+static struct platform_driver ohci_hcd_ep93xx_driver = {
+        .probe          = ohci_hcd_ep93xx_drv_probe,
+        .remove         = ohci_hcd_ep93xx_drv_remove,
+#ifdef CONFIG_PM
+        .suspend        = ohci_hcd_ep93xx_drv_suspend,
+        .resume         = ohci_hcd_ep93xx_drv_resume,
+#endif
+        .driver         = {
+                .name   = "ep93xx-ohci",
+        },
+};
+
+static int __init ohci_hcd_ep93xx_init(void)
+{
+        return platform_driver_register(&ohci_hcd_ep93xx_driver);
+}
+
+static void __exit ohci_hcd_ep93xx_cleanup(void)
+{
+        platform_driver_unregister(&ohci_hcd_ep93xx_driver);
+}
+
+module_init(ohci_hcd_ep93xx_init);
+module_exit(ohci_hcd_ep93xx_cleanup);