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306 lines
8.7 KiB
Diff
306 lines
8.7 KiB
Diff
From 4fa3face95f1ca2e396dd59324a6c6ef01df24cc Mon Sep 17 00:00:00 2001
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From: Hauke Mehrtens <hauke@hauke-m.de>
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Date: Tue, 13 Mar 2012 01:04:48 +0100
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Subject: [PATCH 02/47] USB: EHCI: Add a generic platform device driver
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This adds a generic driver for platform devices. It works like the PCI
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driver and is based on it. This is for devices which do not have an own
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bus but their EHCI controller works like a PCI controller. It will be
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used for the Broadcom bcma and ssb USB EHCI controller.
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Acked-by: Alan Stern <stern@rowland.harvard.edu>
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Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
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Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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---
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drivers/usb/host/Kconfig | 10 ++
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drivers/usb/host/ehci-hcd.c | 5 +
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drivers/usb/host/ehci-platform.c | 198 ++++++++++++++++++++++++++++++++++++++
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include/linux/usb/ehci_pdriver.h | 46 +++++++++
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4 files changed, 259 insertions(+), 0 deletions(-)
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create mode 100644 drivers/usb/host/ehci-platform.c
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create mode 100644 include/linux/usb/ehci_pdriver.h
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--- a/drivers/usb/host/Kconfig
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+++ b/drivers/usb/host/Kconfig
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@@ -403,6 +403,16 @@ config USB_OHCI_HCD_PLATFORM
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If unsure, say N.
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+config USB_EHCI_HCD_PLATFORM
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+ bool "Generic EHCI driver for a platform device"
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+ depends on USB_EHCI_HCD && EXPERIMENTAL
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+ default n
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+ ---help---
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+ Adds an EHCI host driver for a generic platform device, which
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+ provieds a memory space and an irq.
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+
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+ If unsure, say N.
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+
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config USB_OHCI_BIG_ENDIAN_DESC
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bool
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depends on USB_OHCI_HCD
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--- a/drivers/usb/host/ehci-hcd.c
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+++ b/drivers/usb/host/ehci-hcd.c
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@@ -1381,6 +1381,11 @@ MODULE_LICENSE ("GPL");
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#define PLATFORM_DRIVER ehci_mv_driver
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#endif
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+#ifdef CONFIG_USB_EHCI_HCD_PLATFORM
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+#include "ehci-platform.c"
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+#define PLATFORM_DRIVER ehci_platform_driver
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+#endif
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+
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#if !defined(PCI_DRIVER) && !defined(PLATFORM_DRIVER) && \
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!defined(PS3_SYSTEM_BUS_DRIVER) && !defined(OF_PLATFORM_DRIVER) && \
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!defined(XILINX_OF_PLATFORM_DRIVER)
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--- /dev/null
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+++ b/drivers/usb/host/ehci-platform.c
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@@ -0,0 +1,198 @@
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+/*
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+ * Generic platform ehci driver
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+ *
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+ * Copyright 2007 Steven Brown <sbrown@cortland.com>
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+ * Copyright 2010-2012 Hauke Mehrtens <hauke@hauke-m.de>
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+ *
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+ * Derived from the ohci-ssb driver
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+ * Copyright 2007 Michael Buesch <m@bues.ch>
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+ *
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+ * Derived from the EHCI-PCI driver
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+ * Copyright (c) 2000-2004 by David Brownell
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+ *
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+ * Derived from the ohci-pci driver
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+ * Copyright 1999 Roman Weissgaerber
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+ * Copyright 2000-2002 David Brownell
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+ * Copyright 1999 Linus Torvalds
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+ * Copyright 1999 Gregory P. Smith
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+ *
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+ * Licensed under the GNU/GPL. See COPYING for details.
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+ */
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+#include <linux/platform_device.h>
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+#include <linux/usb/ehci_pdriver.h>
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+
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+static int ehci_platform_reset(struct usb_hcd *hcd)
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+{
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+ struct platform_device *pdev = to_platform_device(hcd->self.controller);
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+ struct usb_ehci_pdata *pdata = pdev->dev.platform_data;
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+ struct ehci_hcd *ehci = hcd_to_ehci(hcd);
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+ int retval;
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+
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+ hcd->has_tt = pdata->has_tt;
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+ ehci->has_synopsys_hc_bug = pdata->has_synopsys_hc_bug;
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+ ehci->big_endian_desc = pdata->big_endian_desc;
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+ ehci->big_endian_mmio = pdata->big_endian_mmio;
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+
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+ ehci->caps = hcd->regs + pdata->caps_offset;
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+ retval = ehci_setup(hcd);
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+ if (retval)
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+ return retval;
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+
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+ if (pdata->port_power_on)
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+ ehci_port_power(ehci, 1);
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+ if (pdata->port_power_off)
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+ ehci_port_power(ehci, 0);
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+
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+ return 0;
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+}
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+
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+static const struct hc_driver ehci_platform_hc_driver = {
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+ .description = hcd_name,
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+ .product_desc = "Generic Platform EHCI Controller",
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+ .hcd_priv_size = sizeof(struct ehci_hcd),
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+
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+ .irq = ehci_irq,
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+ .flags = HCD_MEMORY | HCD_USB2,
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+
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+ .reset = ehci_platform_reset,
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+ .start = ehci_run,
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+ .stop = ehci_stop,
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+ .shutdown = ehci_shutdown,
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+
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+ .urb_enqueue = ehci_urb_enqueue,
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+ .urb_dequeue = ehci_urb_dequeue,
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+ .endpoint_disable = ehci_endpoint_disable,
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+ .endpoint_reset = ehci_endpoint_reset,
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+
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+ .get_frame_number = ehci_get_frame,
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+
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+ .hub_status_data = ehci_hub_status_data,
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+ .hub_control = ehci_hub_control,
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+#if defined(CONFIG_PM)
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+ .bus_suspend = ehci_bus_suspend,
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+ .bus_resume = ehci_bus_resume,
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+#endif
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+ .relinquish_port = ehci_relinquish_port,
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+ .port_handed_over = ehci_port_handed_over,
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+
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+ .update_device = ehci_update_device,
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+
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+ .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
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+};
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+
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+static int __devinit ehci_platform_probe(struct platform_device *dev)
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+{
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+ struct usb_hcd *hcd;
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+ struct resource *res_mem;
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+ int irq;
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+ int err = -ENOMEM;
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+
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+ BUG_ON(!dev->dev.platform_data);
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+
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+ if (usb_disabled())
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+ return -ENODEV;
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+
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+ irq = platform_get_irq(dev, 0);
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+ if (irq < 0) {
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+ pr_err("no irq provieded");
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+ return irq;
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+ }
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+ res_mem = platform_get_resource(dev, IORESOURCE_MEM, 0);
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+ if (!res_mem) {
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+ pr_err("no memory recourse provieded");
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+ return -ENXIO;
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+ }
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+
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+ hcd = usb_create_hcd(&ehci_platform_hc_driver, &dev->dev,
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+ dev_name(&dev->dev));
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+ if (!hcd)
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+ return -ENOMEM;
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+
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+ hcd->rsrc_start = res_mem->start;
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+ hcd->rsrc_len = resource_size(res_mem);
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+
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+ if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
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+ pr_err("controller already in use");
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+ err = -EBUSY;
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+ goto err_put_hcd;
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+ }
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+
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+ hcd->regs = ioremap_nocache(hcd->rsrc_start, hcd->rsrc_len);
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+ if (!hcd->regs)
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+ goto err_release_region;
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+ err = usb_add_hcd(hcd, irq, IRQF_SHARED);
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+ if (err)
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+ goto err_iounmap;
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+
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+ platform_set_drvdata(dev, hcd);
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+
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+ return err;
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+
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+err_iounmap:
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+ iounmap(hcd->regs);
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+err_release_region:
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+ release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
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+err_put_hcd:
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+ usb_put_hcd(hcd);
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+ return err;
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+}
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+
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+static int __devexit ehci_platform_remove(struct platform_device *dev)
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+{
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+ struct usb_hcd *hcd = platform_get_drvdata(dev);
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+
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+ usb_remove_hcd(hcd);
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+ iounmap(hcd->regs);
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+ release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
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+ usb_put_hcd(hcd);
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+ platform_set_drvdata(dev, NULL);
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+
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+ return 0;
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+}
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+
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+#ifdef CONFIG_PM
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+
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+static int ehci_platform_suspend(struct device *dev)
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+{
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+ struct usb_hcd *hcd = dev_get_drvdata(dev);
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+ bool wakeup = device_may_wakeup(dev);
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+
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+ ehci_prepare_ports_for_controller_suspend(hcd_to_ehci(hcd), wakeup);
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+ return 0;
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+}
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+
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+static int ehci_platform_resume(struct device *dev)
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+{
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+ struct usb_hcd *hcd = dev_get_drvdata(dev);
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+
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+ ehci_prepare_ports_for_controller_resume(hcd_to_ehci(hcd));
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+ return 0;
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+}
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+
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+#else /* !CONFIG_PM */
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+#define ehci_platform_suspend NULL
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+#define ehci_platform_resume NULL
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+#endif /* CONFIG_PM */
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+
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+static const struct platform_device_id ehci_platform_table[] = {
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+ { "ehci-platform", 0 },
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+ { }
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+};
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+MODULE_DEVICE_TABLE(platform, ehci_platform_table);
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+
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+static const struct dev_pm_ops ehci_platform_pm_ops = {
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+ .suspend = ehci_platform_suspend,
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+ .resume = ehci_platform_resume,
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+};
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+
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+static struct platform_driver ehci_platform_driver = {
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+ .id_table = ehci_platform_table,
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+ .probe = ehci_platform_probe,
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+ .remove = __devexit_p(ehci_platform_remove),
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+ .shutdown = usb_hcd_platform_shutdown,
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+ .driver = {
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+ .owner = THIS_MODULE,
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+ .name = "ehci-platform",
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+ .pm = &ehci_platform_pm_ops,
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+ }
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+};
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--- /dev/null
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+++ b/include/linux/usb/ehci_pdriver.h
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@@ -0,0 +1,46 @@
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+/*
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+ * Copyright (C) 2012 Hauke Mehrtens <hauke@hauke-m.de>
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+ *
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+ * This program is free software; you can redistribute it and/or modify it
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+ * under the terms of the GNU General Public License as published by the
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+ * Free Software Foundation; either version 2 of the License, or (at your
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+ * option) any later version.
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+ *
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+ * This program is distributed in the hope that it will be useful, but
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+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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+ * for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License
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+ * along with this program; if not, write to the Free Software Foundation,
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+ * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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+ */
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+
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+#ifndef __USB_CORE_EHCI_PDRIVER_H
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+#define __USB_CORE_EHCI_PDRIVER_H
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+
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+/**
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+ * struct usb_ehci_pdata - platform_data for generic ehci driver
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+ *
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+ * @caps_offset: offset of the EHCI Capability Registers to the start of
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+ * the io memory region provided to the driver.
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+ * @has_tt: set to 1 if TT is integrated in root hub.
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+ * @port_power_on: set to 1 if the controller needs a power up after
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+ * initialization.
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+ * @port_power_off: set to 1 if the controller needs to be powered down
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+ * after initialization.
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+ *
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+ * These are general configuration options for the EHCI controller. All of
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+ * these options are activating more or less workarounds for some hardware.
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+ */
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+struct usb_ehci_pdata {
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+ int caps_offset;
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+ unsigned has_tt:1;
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+ unsigned has_synopsys_hc_bug:1;
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+ unsigned big_endian_desc:1;
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+ unsigned big_endian_mmio:1;
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+ unsigned port_power_on:1;
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+ unsigned port_power_off:1;
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+};
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+
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+#endif /* __USB_CORE_EHCI_PDRIVER_H */
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