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[PATCH v4 2/7] USB: EHCI: Add a generic platform device driver

To: gregkh@linuxfoundation.org
Subject: [PATCH v4 2/7] USB: EHCI: Add a generic platform device driver
From: Hauke Mehrtens <hauke@hauke-m.de>
Date: Tue, 13 Mar 2012 01:04:48 +0100
Cc: stern@rowland.harvard.edu, linux-mips@linux-mips.org, ralf@linux-mips.org, m@bues.ch, linux-usb@vger.kernel.org, linux-wireless@vger.kernel.org, Hauke Mehrtens <hauke@hauke-m.de>
In-reply-to: <1331597093-425-1-git-send-email-hauke@hauke-m.de>
References: <1331597093-425-1-git-send-email-hauke@hauke-m.de>
Sender: linux-mips-bounce@linux-mips.org
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.

Acked-by: Alan Stern <stern@rowland.harvard.edu>
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 |  198 ++++++++++++++++++++++++++++++++++++++
 include/linux/usb/ehci_pdriver.h |   46 +++++++++
 4 files changed, 259 insertions(+), 0 deletions(-)
 create mode 100644 drivers/usb/host/ehci-platform.c
 create mode 100644 include/linux/usb/ehci_pdriver.h

diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
index fd521f3..5f46342 100644
--- a/drivers/usb/host/Kconfig
+++ b/drivers/usb/host/Kconfig
@@ -403,6 +403,16 @@ 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
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
index a007a9f..afe0984 100644
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -1376,6 +1376,11 @@ MODULE_LICENSE ("GPL");
 #define        PLATFORM_DRIVER         ehci_mv_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)
diff --git a/drivers/usb/host/ehci-platform.c b/drivers/usb/host/ehci-platform.c
new file mode 100644
index 0000000..d238b4e2
--- /dev/null
+++ b/drivers/usb/host/ehci-platform.c
@@ -0,0 +1,198 @@
+/*
+ * 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/ehci_pdriver.h>
+
+static int ehci_platform_reset(struct usb_hcd *hcd)
+{
+       struct platform_device *pdev = to_platform_device(hcd->self.controller);
+       struct usb_ehci_pdata *pdata = pdev->dev.platform_data;
+       struct ehci_hcd *ehci = hcd_to_ehci(hcd);
+       int retval;
+
+       hcd->has_tt = pdata->has_tt;
+       ehci->has_synopsys_hc_bug = pdata->has_synopsys_hc_bug;
+       ehci->big_endian_desc = pdata->big_endian_desc;
+       ehci->big_endian_mmio = pdata->big_endian_mmio;
+
+       ehci->caps = hcd->regs + pdata->caps_offset;
+       retval = ehci_setup(hcd);
+       if (retval)
+               return retval;
+
+       if (pdata->port_power_on)
+               ehci_port_power(ehci, 1);
+       if (pdata->port_power_off)
+               ehci_port_power(ehci, 0);
+
+       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;
+
+       BUG_ON(!dev->dev.platform_data);
+
+       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,
+       }
+};
diff --git a/include/linux/usb/ehci_pdriver.h b/include/linux/usb/ehci_pdriver.h
new file mode 100644
index 0000000..1894f42
--- /dev/null
+++ b/include/linux/usb/ehci_pdriver.h
@@ -0,0 +1,46 @@
+/*
+ * Copyright (C) 2012 Hauke Mehrtens <hauke@hauke-m.de>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#ifndef __USB_CORE_EHCI_PDRIVER_H
+#define __USB_CORE_EHCI_PDRIVER_H
+
+/**
+ * struct usb_ehci_pdata - platform_data for generic ehci driver
+ *
+ * @caps_offset:       offset of the EHCI Capability Registers to the start of
+ *                     the io memory region provided to the driver.
+ * @has_tt:            set to 1 if TT is integrated in root hub.
+ * @port_power_on:     set to 1 if the controller needs a power up after
+ *                     initialization.
+ * @port_power_off:    set to 1 if the controller needs to be powered down
+ *                     after initialization.
+ *
+ * These are general configuration options for the EHCI controller. All of
+ * these options are activating more or less workarounds for some hardware.
+ */
+struct usb_ehci_pdata {
+       int             caps_offset;
+       unsigned        has_tt:1;
+       unsigned        has_synopsys_hc_bug:1;
+       unsigned        big_endian_desc:1;
+       unsigned        big_endian_mmio:1;
+       unsigned        port_power_on:1;
+       unsigned        port_power_off:1;
+};
+
+#endif /* __USB_CORE_EHCI_PDRIVER_H */
-- 
1.7.5.4


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