usb: Add support for VIA VT8500 and compatibles in EHCI HCD

VIA and WonderMedia Systems-on-Chip feature a standard EHCI host
controller. This adds necessary glue to use the standard driver
with these systems.

Signed-off-by: Alexey Charkov <alchark@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

3 files changed, 178 insertions, 0 deletions

diff --git a/drivers/usb/Kconfig b/drivers/usb/Kconfig
index 67eb3770868f..7d13506cc383 100644
--- a/drivers/usb/Kconfig
+++ b/drivers/usb/Kconfig
@@ -66,6 +66,7 @@ config USB_ARCH_HAS_EHCI
         default y if ARCH_AT91SAM9G45
         default y if ARCH_MXC
         default y if ARCH_OMAP3
+        default y if ARCH_VT8500
         default PCI
 
 # ARM SA1111 chips have a non-PCI based "OHCI-compatible" USB host interface.
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
index 502a7e6fef42..10f985def70f 100644
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -1216,6 +1216,11 @@ MODULE_LICENSE ("GPL");
 #define PLATFORM_DRIVER         ehci_octeon_driver
 #endif
 
+#ifdef CONFIG_ARCH_VT8500
+#include "ehci-vt8500.c"
+#define PLATFORM_DRIVER         vt8500_ehci_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-vt8500.c b/drivers/usb/host/ehci-vt8500.c
new file mode 100644
index 000000000000..20168062035a
--- /dev/null
+++ b/drivers/usb/host/ehci-vt8500.c
@@ -0,0 +1,172 @@
+/*
+ * drivers/usb/host/ehci-vt8500.c
+ *
+ * Copyright (C) 2010 Alexey Charkov <alchark@gmail.com>
+ *
+ * Based on ehci-au1xxx.c
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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.
+ *
+ */
+
+#include <linux/platform_device.h>
+
+static int ehci_update_device(struct usb_hcd *hcd, struct usb_device *udev)
+{
+        struct ehci_hcd *ehci = hcd_to_ehci(hcd);
+        int rc = 0;
+
+        if (!udev->parent) /* udev is root hub itself, impossible */
+                rc = -1;
+        /* we only support lpm device connected to root hub yet */
+        if (ehci->has_lpm && !udev->parent->parent) {
+                rc = ehci_lpm_set_da(ehci, udev->devnum, udev->portnum);
+                if (!rc)
+                        rc = ehci_lpm_check(ehci, udev->portnum);
+        }
+        return rc;
+}
+
+static const struct hc_driver vt8500_ehci_hc_driver = {
+        .description            = hcd_name,
+        .product_desc           = "VT8500 EHCI",
+        .hcd_priv_size          = sizeof(struct ehci_hcd),
+
+        /*
+         * generic hardware linkage
+         */
+        .irq                    = ehci_irq,
+        .flags                  = HCD_MEMORY | HCD_USB2,
+
+        /*
+         * basic lifecycle operations
+         */
+        .reset                  = ehci_init,
+        .start                  = ehci_run,
+        .stop                   = ehci_stop,
+        .shutdown               = ehci_shutdown,
+
+        /*
+         * managing i/o requests and associated device resources
+         */
+        .urb_enqueue            = ehci_urb_enqueue,
+        .urb_dequeue            = ehci_urb_dequeue,
+        .endpoint_disable       = ehci_endpoint_disable,
+        .endpoint_reset         = ehci_endpoint_reset,
+
+        /*
+         * scheduling support
+         */
+        .get_frame_number       = ehci_get_frame,
+
+        /*
+         * root hub support
+         */
+        .hub_status_data        = ehci_hub_status_data,
+        .hub_control            = ehci_hub_control,
+        .bus_suspend            = ehci_bus_suspend,
+        .bus_resume             = ehci_bus_resume,
+        .relinquish_port        = ehci_relinquish_port,
+        .port_handed_over       = ehci_port_handed_over,
+
+        /*
+         * call back when device connected and addressed
+         */
+        .update_device =        ehci_update_device,
+
+        .clear_tt_buffer_complete       = ehci_clear_tt_buffer_complete,
+};
+
+static int vt8500_ehci_drv_probe(struct platform_device *pdev)
+{
+        struct usb_hcd *hcd;
+        struct ehci_hcd *ehci;
+        struct resource *res;
+        int ret;
+
+        if (usb_disabled())
+                return -ENODEV;
+
+        if (pdev->resource[1].flags != IORESOURCE_IRQ) {
+                pr_debug("resource[1] is not IORESOURCE_IRQ");
+                return -ENOMEM;
+        }
+        hcd = usb_create_hcd(&vt8500_ehci_hc_driver, &pdev->dev, "VT8500");
+        if (!hcd)
+                return -ENOMEM;
+
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        hcd->rsrc_start = res->start;
+        hcd->rsrc_len = resource_size(res);
+
+        if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
+                pr_debug("request_mem_region failed");
+                ret = -EBUSY;
+                goto err1;
+        }
+
+        hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
+        if (!hcd->regs) {
+                pr_debug("ioremap failed");
+                ret = -ENOMEM;
+                goto err2;
+        }
+
+        ehci = hcd_to_ehci(hcd);
+        ehci->caps = hcd->regs;
+        ehci->regs = hcd->regs + HC_LENGTH(readl(&ehci->caps->hc_capbase));
+
+        dbg_hcs_params(ehci, "reset");
+        dbg_hcc_params(ehci, "reset");
+
+        /* cache this readonly data; minimize chip reads */
+        ehci->hcs_params = readl(&ehci->caps->hcs_params);
+
+        ehci_port_power(ehci, 1);
+
+        ret = usb_add_hcd(hcd, pdev->resource[1].start,
+                          IRQF_DISABLED | IRQF_SHARED);
+        if (ret == 0) {
+                platform_set_drvdata(pdev, hcd);
+                return ret;
+        }
+
+        iounmap(hcd->regs);
+err2:
+        release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
+err1:
+        usb_put_hcd(hcd);
+        return ret;
+}
+
+static int vt8500_ehci_drv_remove(struct platform_device *pdev)
+{
+        struct usb_hcd *hcd = platform_get_drvdata(pdev);
+
+        usb_remove_hcd(hcd);
+        iounmap(hcd->regs);
+        release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
+        usb_put_hcd(hcd);
+        platform_set_drvdata(pdev, NULL);
+
+        return 0;
+}
+
+static struct platform_driver vt8500_ehci_driver = {
+        .probe          = vt8500_ehci_drv_probe,
+        .remove         = vt8500_ehci_drv_remove,
+        .shutdown       = usb_hcd_platform_shutdown,
+        .driver = {
+                .name   = "vt8500-ehci",
+                .owner  = THIS_MODULE,
+        }
+};
+
+MODULE_ALIAS("platform:vt8500-ehci");