openwrt/target/linux/brcm47xx/patches-3.2/182-USB-EHCI-Add-a-generic-platform-device-driver.patch

From 1be00523336ac484c52681f838dfb8a76e8531cd Mon Sep 17 00:00:00 2001
From: Hauke Mehrtens <hauke@hauke-m.de>
Date: Sat, 26 Nov 2011 21:28:56 +0100
Subject: [PATCH 182/186] USB: EHCI: Add a generic platform device driver

This adds a generic driver for platform devices. It works like the PCI
driver and is based on it. This is for devices which do not have an own
bus but their EHCI controller works like a PCI controller. It will be
used for the Broadcom bcma and ssb USB EHCI controller.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
---
 drivers/usb/host/Kconfig         |   10 ++
 drivers/usb/host/ehci-hcd.c      |    5 +
 drivers/usb/host/ehci-platform.c |  199 ++++++++++++++++++++++++++++++++++++++
 3 files changed, 214 insertions(+), 0 deletions(-)
 create mode 100644 drivers/usb/host/ehci-platform.c

--- a/drivers/usb/host/Kconfig
+++ b/drivers/usb/host/Kconfig
@@ -388,6 +388,16 @@ config USB_OHCI_HCD_PLATFORM
 
 	  If unsure, say N.
 
+config USB_EHCI_HCD_PLATFORM
+	bool "Generic EHCI driver for a platform device"
+	depends on USB_EHCI_HCD && EXPERIMENTAL
+	default n
+	---help---
+	  Adds an EHCI host driver for a generic platform device, which
+	  provieds a memory space and an irq.
+
+	  If unsure, say N.
+
 config USB_OHCI_BIG_ENDIAN_DESC
 	bool
 	depends on USB_OHCI_HCD
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -1329,6 +1329,11 @@ MODULE_LICENSE ("GPL");
 #define PLATFORM_DRIVER		ehci_xls_driver
 #endif
 
+#ifdef CONFIG_USB_EHCI_HCD_PLATFORM
+#include "ehci-platform.c"
+#define PLATFORM_DRIVER		ehci_platform_driver
+#endif
+
 #if !defined(PCI_DRIVER) && !defined(PLATFORM_DRIVER) && \
     !defined(PS3_SYSTEM_BUS_DRIVER) && !defined(OF_PLATFORM_DRIVER) && \
     !defined(XILINX_OF_PLATFORM_DRIVER)
--- /dev/null
+++ b/drivers/usb/host/ehci-platform.c
@@ -0,0 +1,199 @@
+/*
+ * Generic platform ehci driver
+ *
+ * Copyright 2007 Steven Brown <sbrown@cortland.com>
+ * Copyright 2010-2012 Hauke Mehrtens <hauke@hauke-m.de>
+ *
+ * Derived from the ohci-ssb driver
+ * Copyright 2007 Michael Buesch <m@bues.ch>
+ *
+ * Derived from the EHCI-PCI driver
+ * Copyright (c) 2000-2004 by David Brownell
+ *
+ * Derived from the ohci-pci driver
+ * Copyright 1999 Roman Weissgaerber
+ * Copyright 2000-2002 David Brownell
+ * Copyright 1999 Linus Torvalds
+ * Copyright 1999 Gregory P. Smith
+ *
+ * Licensed under the GNU/GPL. See COPYING for details.
+ */
+#include <linux/platform_device.h>
+#include <linux/usb/hci_driver.h>
+
+static int ehci_platform_reset(struct usb_hcd *hcd)
+{
+	struct platform_device *pdev = to_platform_device(hcd->self.controller);
+	struct usb_hci_pdata *pdata = pdev->dev.platform_data;
+	struct ehci_hcd *ehci = hcd_to_ehci(hcd);
+	int caps_offset = 0;
+	int flags = 0;
+	int retval;
+
+	if (pdata) {
+		caps_offset = pdata->caps_offset;
+		flags = pdata->flags;
+	}
+
+	if (flags & USB_HCI_PDATA_HAS_TT_SET)
+		hcd->has_tt = pdata->has_tt;
+
+	ehci->caps = hcd->regs + caps_offset;
+	retval = ehci_setup(hcd);
+	if (retval)
+		return retval;
+
+	if (flags & USB_HCI_PDATA_PORT_POWER_SET)
+		ehci_port_power(ehci, pdata->power_set_is_on);
+
+	return 0;
+}
+
+static const struct hc_driver ehci_platform_hc_driver = {
+	.description		= hcd_name,
+	.product_desc		= "Generic Platform EHCI Controller",
+	.hcd_priv_size		= sizeof(struct ehci_hcd),
+
+	.irq			= ehci_irq,
+	.flags			= HCD_MEMORY | HCD_USB2,
+
+	.reset			= ehci_platform_reset,
+	.start			= ehci_run,
+	.stop			= ehci_stop,
+	.shutdown		= ehci_shutdown,
+
+	.urb_enqueue		= ehci_urb_enqueue,
+	.urb_dequeue		= ehci_urb_dequeue,
+	.endpoint_disable	= ehci_endpoint_disable,
+	.endpoint_reset		= ehci_endpoint_reset,
+
+	.get_frame_number	= ehci_get_frame,
+
+	.hub_status_data	= ehci_hub_status_data,
+	.hub_control		= ehci_hub_control,
+#if defined(CONFIG_PM)
+	.bus_suspend		= ehci_bus_suspend,
+	.bus_resume		= ehci_bus_resume,
+#endif
+	.relinquish_port	= ehci_relinquish_port,
+	.port_handed_over	= ehci_port_handed_over,
+
+	.update_device		= ehci_update_device,
+
+	.clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
+};
+
+static int __devinit ehci_platform_probe(struct platform_device *dev)
+{
+	struct usb_hcd *hcd;
+	struct resource *res_mem;
+	int irq;
+	int err = -ENOMEM;
+
+	if (usb_disabled())
+		return -ENODEV;
+
+	irq = platform_get_irq(dev, 0);
+	if (irq < 0) {
+		pr_err("no irq provieded");
+		return irq;
+	}
+	res_mem = platform_get_resource(dev, IORESOURCE_MEM, 0);
+	if (!res_mem) {
+		pr_err("no memory recourse provieded");
+		return -ENXIO;
+	}
+
+	hcd = usb_create_hcd(&ehci_platform_hc_driver, &dev->dev,
+			     dev_name(&dev->dev));
+	if (!hcd)
+		return -ENOMEM;
+
+	hcd->rsrc_start = res_mem->start;
+	hcd->rsrc_len = resource_size(res_mem);
+
+	if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
+		pr_err("controller already in use");
+		err = -EBUSY;
+		goto err_put_hcd;
+	}
+
+	hcd->regs = ioremap_nocache(hcd->rsrc_start, hcd->rsrc_len);
+	if (!hcd->regs)
+		goto err_release_region;
+	err = usb_add_hcd(hcd, irq, IRQF_SHARED);
+	if (err)
+		goto err_iounmap;
+
+	platform_set_drvdata(dev, hcd);
+
+	return err;
+
+err_iounmap:
+	iounmap(hcd->regs);
+err_release_region:
+	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
+err_put_hcd:
+	usb_put_hcd(hcd);
+	return err;
+}
+
+static int __devexit ehci_platform_remove(struct platform_device *dev)
+{
+	struct usb_hcd *hcd = platform_get_drvdata(dev);
+
+	usb_remove_hcd(hcd);
+	iounmap(hcd->regs);
+	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
+	usb_put_hcd(hcd);
+	platform_set_drvdata(dev, NULL);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM
+
+static int ehci_platform_suspend(struct device *dev)
+{
+	struct usb_hcd *hcd = dev_get_drvdata(dev);
+	bool wakeup = device_may_wakeup(dev);
+
+	ehci_prepare_ports_for_controller_suspend(hcd_to_ehci(hcd), wakeup);
+	return 0;
+}
+
+static int ehci_platform_resume(struct device *dev)
+{
+	struct usb_hcd *hcd = dev_get_drvdata(dev);
+
+	ehci_prepare_ports_for_controller_resume(hcd_to_ehci(hcd));
+	return 0;
+}
+
+#else /* !CONFIG_PM */
+#define ehci_platform_suspend	NULL
+#define ehci_platform_resume	NULL
+#endif /* CONFIG_PM */
+
+static const struct platform_device_id ehci_platform_table[] = {
+	{ "ehci-platform", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(platform, ehci_platform_table);
+
+static const struct dev_pm_ops ehci_platform_pm_ops = {
+	.suspend	= ehci_platform_suspend,
+	.resume		= ehci_platform_resume,
+};
+
+static struct platform_driver ehci_platform_driver = {
+	.id_table	= ehci_platform_table,
+	.probe		= ehci_platform_probe,
+	.remove		= __devexit_p(ehci_platform_remove),
+	.shutdown	= usb_hcd_platform_shutdown,
+	.driver		= {
+		.owner	= THIS_MODULE,
+		.name	= "ehci-platform",
+		.pm	= &ehci_platform_pm_ops,
+	}
+};