USB: ohci SSB bus glue

This adds SSB bus glue for the USB OHCI HCD. 

Signed-off-by: Michael Buesch <mb@bu3sch.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

3 files changed, 280 insertions, 1 deletions

diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
index 565d6ef4c4cf..c978d622fa8a 100644
--- a/drivers/usb/host/Kconfig
+++ b/drivers/usb/host/Kconfig
@@ -154,6 +154,19 @@ config USB_OHCI_HCD_PCI
           Enables support for PCI-bus plug-in USB controller cards.
           If unsure, say Y.
 
+config USB_OHCI_HCD_SSB
+        bool "OHCI support for Broadcom SSB OHCI core"
+        depends on USB_OHCI_HCD && SSB && EXPERIMENTAL
+        default n
+        ---help---
+          Support for the Sonics Silicon Backplane (SSB) attached
+          Broadcom USB OHCI core.
+
+          This device is present in some embedded devices with
+          Broadcom based SSB bus.
+
+          If unsure, say N.
+
 config USB_OHCI_BIG_ENDIAN_DESC
         bool
         depends on USB_OHCI_HCD
diff --git a/drivers/usb/host/ohci-hcd.c b/drivers/usb/host/ohci-hcd.c
index f7c6ced2bc03..240c7f507541 100644
--- a/drivers/usb/host/ohci-hcd.c
+++ b/drivers/usb/host/ohci-hcd.c
@@ -1033,11 +1033,17 @@ MODULE_LICENSE ("GPL");
 #define PS3_SYSTEM_BUS_DRIVER   ps3_ohci_driver
 #endif
 
+#ifdef CONFIG_USB_OHCI_HCD_SSB
+#include "ohci-ssb.c"
+#define SSB_OHCI_DRIVER         ssb_ohci_driver
+#endif
+
 #if     !defined(PCI_DRIVER) &&         \
         !defined(PLATFORM_DRIVER) &&    \
         !defined(OF_PLATFORM_DRIVER) && \
         !defined(SA1111_DRIVER) &&      \
-        !defined(PS3_SYSTEM_BUS_DRIVER)
+        !defined(PS3_SYSTEM_BUS_DRIVER) && \
+        !defined(SSB_OHCI_DRIVER)
 #error "missing bus glue for ohci-hcd"
 #endif
 
@@ -1082,10 +1088,20 @@ static int __init ohci_hcd_mod_init(void)
                 goto error_pci;
 #endif
 
+#ifdef SSB_OHCI_DRIVER
+        retval = ssb_driver_register(&SSB_OHCI_DRIVER);
+        if (retval)
+                goto error_ssb;
+#endif
+
         return retval;
 
         /* Error path */
+#ifdef SSB_OHCI_DRIVER
+ error_ssb:
+#endif
 #ifdef PCI_DRIVER
+        pci_unregister_driver(&PCI_DRIVER);
  error_pci:
 #endif
 #ifdef SA1111_DRIVER
@@ -1110,6 +1126,9 @@ module_init(ohci_hcd_mod_init);
 
 static void __exit ohci_hcd_mod_exit(void)
 {
+#ifdef SSB_OHCI_DRIVER
+        ssb_driver_unregister(&SSB_OHCI_DRIVER);
+#endif
 #ifdef PCI_DRIVER
         pci_unregister_driver(&PCI_DRIVER);
 #endif
diff --git a/drivers/usb/host/ohci-ssb.c b/drivers/usb/host/ohci-ssb.c
new file mode 100644
index 000000000000..bc3e785d8c00
--- /dev/null
+++ b/drivers/usb/host/ohci-ssb.c
@@ -0,0 +1,247 @@
+/*
+ * Sonics Silicon Backplane
+ * Broadcom USB-core OHCI driver
+ *
+ * Copyright 2007 Michael Buesch <mb@bu3sch.de>
+ *
+ * Derived from the OHCI-PCI driver
+ * Copyright 1999 Roman Weissgaerber
+ * Copyright 2000-2002 David Brownell
+ * Copyright 1999 Linus Torvalds
+ * Copyright 1999 Gregory P. Smith
+ *
+ * Derived from the USBcore related parts of Broadcom-SB
+ * Copyright 2005 Broadcom Corporation
+ *
+ * Licensed under the GNU/GPL. See COPYING for details.
+ */
+#include <linux/ssb/ssb.h>
+
+
+#define SSB_OHCI_TMSLOW_HOSTMODE        (1 << 29)
+
+struct ssb_ohci_device {
+        struct ohci_hcd ohci; /* _must_ be at the beginning. */
+
+        u32 enable_flags;
+};
+
+static inline
+struct ssb_ohci_device *hcd_to_ssb_ohci(struct usb_hcd *hcd)
+{
+        return (struct ssb_ohci_device *)(hcd->hcd_priv);
+}
+
+
+static int ssb_ohci_reset(struct usb_hcd *hcd)
+{
+        struct ssb_ohci_device *ohcidev = hcd_to_ssb_ohci(hcd);
+        struct ohci_hcd *ohci = &ohcidev->ohci;
+        int err;
+
+        ohci_hcd_init(ohci);
+        err = ohci_init(ohci);
+
+        return err;
+}
+
+static int ssb_ohci_start(struct usb_hcd *hcd)
+{
+        struct ssb_ohci_device *ohcidev = hcd_to_ssb_ohci(hcd);
+        struct ohci_hcd *ohci = &ohcidev->ohci;
+        int err;
+
+        err = ohci_run(ohci);
+        if (err < 0) {
+                ohci_err(ohci, "can't start\n");
+                ohci_stop(hcd);
+        }
+
+        return err;
+}
+
+#ifdef CONFIG_PM
+static int ssb_ohci_hcd_suspend(struct usb_hcd *hcd, pm_message_t message)
+{
+        struct ssb_ohci_device *ohcidev = hcd_to_ssb_ohci(hcd);
+        struct ohci_hcd *ohci = &ohcidev->ohci;
+        unsigned long flags;
+
+        spin_lock_irqsave(&ohci->lock, flags);
+
+        ohci_writel(ohci, OHCI_INTR_MIE, &ohci->regs->intrdisable);
+        ohci_readl(ohci, &ohci->regs->intrdisable); /* commit write */
+
+        /* make sure snapshot being resumed re-enumerates everything */
+        if (message.event == PM_EVENT_PRETHAW)
+                ohci_usb_reset(ohci);
+
+        clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
+
+        spin_unlock_irqrestore(&ohci->lock, flags);
+        return 0;
+}
+
+static int ssb_ohci_hcd_resume(struct usb_hcd *hcd)
+{
+        set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
+        usb_hcd_resume_root_hub(hcd);
+        return 0;
+}
+#endif /* CONFIG_PM */
+
+static const struct hc_driver ssb_ohci_hc_driver = {
+        .description            = "ssb-usb-ohci",
+        .product_desc           = "SSB OHCI Controller",
+        .hcd_priv_size          = sizeof(struct ssb_ohci_device),
+
+        .irq                    = ohci_irq,
+        .flags                  = HCD_MEMORY | HCD_USB11,
+
+        .reset                  = ssb_ohci_reset,
+        .start                  = ssb_ohci_start,
+        .stop                   = ohci_stop,
+        .shutdown               = ohci_shutdown,
+
+#ifdef CONFIG_PM
+        .suspend                = ssb_ohci_hcd_suspend,
+        .resume                 = ssb_ohci_hcd_resume,
+#endif
+
+        .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,
+        .hub_irq_enable         = ohci_rhsc_enable,
+        .bus_suspend            = ohci_bus_suspend,
+        .bus_resume             = ohci_bus_resume,
+
+        .start_port_reset       = ohci_start_port_reset,
+};
+
+static void ssb_ohci_detach(struct ssb_device *dev)
+{
+        struct usb_hcd *hcd = ssb_get_drvdata(dev);
+
+        usb_remove_hcd(hcd);
+        iounmap(hcd->regs);
+        usb_put_hcd(hcd);
+        ssb_device_disable(dev, 0);
+}
+
+static int ssb_ohci_attach(struct ssb_device *dev)
+{
+        struct ssb_ohci_device *ohcidev;
+        struct usb_hcd *hcd;
+        int err = -ENOMEM;
+        u32 tmp, flags = 0;
+
+        if (dev->id.coreid == SSB_DEV_USB11_HOSTDEV)
+                flags |= SSB_OHCI_TMSLOW_HOSTMODE;
+
+        ssb_device_enable(dev, flags);
+
+        hcd = usb_create_hcd(&ssb_ohci_hc_driver, dev->dev,
+                        dev->dev->bus_id);
+        if (!hcd)
+                goto err_dev_disable;
+        ohcidev = hcd_to_ssb_ohci(hcd);
+        ohcidev->enable_flags = flags;
+
+        tmp = ssb_read32(dev, SSB_ADMATCH0);
+        hcd->rsrc_start = ssb_admatch_base(tmp);
+        hcd->rsrc_len = ssb_admatch_size(tmp);
+        hcd->regs = ioremap_nocache(hcd->rsrc_start, hcd->rsrc_len);
+        if (!hcd->regs)
+                goto err_put_hcd;
+        err = usb_add_hcd(hcd, dev->irq, IRQF_SHARED);
+        if (err)
+                goto err_iounmap;
+
+        ssb_set_drvdata(dev, hcd);
+
+        return err;
+
+err_iounmap:
+        iounmap(hcd->regs);
+err_put_hcd:
+        usb_put_hcd(hcd);
+err_dev_disable:
+        ssb_device_disable(dev, flags);
+        return err;
+}
+
+static int ssb_ohci_probe(struct ssb_device *dev,
+                const struct ssb_device_id *id)
+{
+        int err;
+        u16 chipid_top;
+
+        /* USBcores are only connected on embedded devices. */
+        chipid_top = (dev->bus->chip_id & 0xFF00);
+        if (chipid_top != 0x4700 && chipid_top != 0x5300)
+                return -ENODEV;
+
+        /* TODO: Probably need checks here; is the core connected? */
+
+        if (usb_disabled())
+                return -ENODEV;
+
+        /* We currently always attach SSB_DEV_USB11_HOSTDEV
+         * as HOST OHCI. If we want to attach it as Client device,
+         * we must branch here and call into the (yet to
+         * be written) Client mode driver. Same for remove(). */
+
+        err = ssb_ohci_attach(dev);
+
+        return err;
+}
+
+static void ssb_ohci_remove(struct ssb_device *dev)
+{
+        ssb_ohci_detach(dev);
+}
+
+#ifdef CONFIG_PM
+
+static int ssb_ohci_suspend(struct ssb_device *dev, pm_message_t state)
+{
+        ssb_device_disable(dev, 0);
+
+        return 0;
+}
+
+static int ssb_ohci_resume(struct ssb_device *dev)
+{
+        struct usb_hcd *hcd = ssb_get_drvdata(dev);
+        struct ssb_ohci_device *ohcidev = hcd_to_ssb_ohci(hcd);
+
+        ssb_device_enable(dev, ohcidev->enable_flags);
+
+        return 0;
+}
+
+#else /* !CONFIG_PM */
+#define ssb_ohci_suspend        NULL
+#define ssb_ohci_resume NULL
+#endif /* CONFIG_PM */
+
+static const struct ssb_device_id ssb_ohci_table[] = {
+        SSB_DEVICE(SSB_VENDOR_BROADCOM, SSB_DEV_USB11_HOSTDEV, SSB_ANY_REV),
+        SSB_DEVICE(SSB_VENDOR_BROADCOM, SSB_DEV_USB11_HOST, SSB_ANY_REV),
+        SSB_DEVTABLE_END
+};
+MODULE_DEVICE_TABLE(ssb, ssb_ohci_table);
+
+static struct ssb_driver ssb_ohci_driver = {
+        .name           = KBUILD_MODNAME,
+        .id_table       = ssb_ohci_table,
+        .probe          = ssb_ohci_probe,
+        .remove         = ssb_ohci_remove,
+        .suspend        = ssb_ohci_suspend,
+        .resume         = ssb_ohci_resume,
+};