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 565d6ef4c4c..c978d622fa8 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 f7c6ced2bc0..240c7f50754 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 00000000000..bc3e785d8c0
--- /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,
+};