usb: host: mips: sead3: USB Host controller support for SEAD-3 platform.

Add EHCI driver for MIPS SEAD-3 development platform.

Signed-off-by: Chris Dearman <chris@mips.com>
Signed-off-by: Steven J. Hill <sjhill@mips.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

3 files changed, 274 insertions, 2 deletions

diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
index 00b6fc81c80e..896fc91c54ab 100644
--- a/drivers/usb/host/Kconfig
+++ b/drivers/usb/host/Kconfig
@@ -110,13 +110,14 @@ config USB_EHCI_BIG_ENDIAN_MMIO
         depends on USB_EHCI_HCD && (PPC_CELLEB || PPC_PS3 || 440EPX || \
                                     ARCH_IXP4XX || XPS_USB_HCD_XILINX || \
                                     PPC_MPC512x || CPU_CAVIUM_OCTEON || \
-                                    PMC_MSP || SPARC_LEON)
+                                    PMC_MSP || SPARC_LEON || MIPS_SEAD3)
         default y
 
 config USB_EHCI_BIG_ENDIAN_DESC
         bool
         depends on USB_EHCI_HCD && (440EPX || ARCH_IXP4XX || XPS_USB_HCD_XILINX || \
-                                    PPC_MPC512x || PMC_MSP || SPARC_LEON)
+                                    PPC_MPC512x || PMC_MSP || SPARC_LEON || \
+                                    MIPS_SEAD3)
         default y
 
 config XPS_USB_HCD_XILINX
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
index 343f40c23b5f..9ca6359c4ff1 100644
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -1364,6 +1364,11 @@ MODULE_LICENSE ("GPL");
 #define PLATFORM_DRIVER         ehci_ls1x_driver
 #endif
 
+#ifdef CONFIG_MIPS_SEAD3
+#include "ehci-sead3.c"
+#define PLATFORM_DRIVER         ehci_hcd_sead3_driver
+#endif
+
 #ifdef CONFIG_USB_EHCI_HCD_PLATFORM
 #include "ehci-platform.c"
 #define PLATFORM_DRIVER         ehci_platform_driver
diff --git a/drivers/usb/host/ehci-sead3.c b/drivers/usb/host/ehci-sead3.c
new file mode 100644
index 000000000000..4c164308ed20
--- /dev/null
+++ b/drivers/usb/host/ehci-sead3.c
@@ -0,0 +1,266 @@
+/*
+ * MIPS CI13320A EHCI Host Controller driver
+ * Based on "ehci-au1xxx.c" by K.Boge <karsten.boge@amd.com>
+ *
+ * Copyright (C) 2012 MIPS Technologies, Inc.
+ *
+ * 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.
+ */
+
+#include <linux/platform_device.h>
+
+static int ehci_sead3_setup(struct usb_hcd *hcd)
+{
+        int ret;
+        struct ehci_hcd *ehci = hcd_to_ehci(hcd);
+
+        ehci->caps = hcd->regs + 0x100;
+
+        ret = ehci_setup(hcd);
+        if (ret)
+                return ret;
+
+        ehci->need_io_watchdog = 0;
+
+#ifdef __BIG_ENDIAN
+        ehci->big_endian_mmio = 1;
+        ehci->big_endian_desc = 1;
+#endif
+
+        /* Set burst length to 16 words. */
+        ehci_writel(ehci, 0x1010, &ehci->regs->reserved[1]);
+
+        return ret;
+}
+
+const struct hc_driver ehci_sead3_hc_driver = {
+        .description            = hcd_name,
+        .product_desc           = "SEAD-3 EHCI",
+        .hcd_priv_size          = sizeof(struct ehci_hcd),
+
+        /*
+         * generic hardware linkage
+         */
+        .irq                    = ehci_irq,
+        .flags                  = HCD_MEMORY | HCD_USB2,
+
+        /*
+         * basic lifecycle operations
+         *
+         */
+        .reset                  = ehci_sead3_setup,
+        .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,
+
+        .clear_tt_buffer_complete       = ehci_clear_tt_buffer_complete,
+};
+
+static int ehci_hcd_sead3_drv_probe(struct platform_device *pdev)
+{
+        struct usb_hcd *hcd;
+        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(&ehci_sead3_hc_driver, &pdev->dev, "SEAD-3");
+        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;
+        }
+
+        /* Root hub has integrated TT. */
+        hcd->has_tt = 1;
+
+        ret = usb_add_hcd(hcd, pdev->resource[1].start,
+                          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 ehci_hcd_sead3_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;
+}
+
+#ifdef CONFIG_PM
+static int ehci_hcd_sead3_drv_suspend(struct device *dev)
+{
+        struct usb_hcd *hcd = dev_get_drvdata(dev);
+        struct ehci_hcd *ehci = hcd_to_ehci(hcd);
+        unsigned long flags;
+        int rc = 0;
+
+        if (time_before(jiffies, ehci->next_statechange))
+                msleep(20);
+
+        /* Root hub was already suspended. Disable irq emission and
+         * mark HW unaccessible.  The PM and USB cores make sure that
+         * the root hub is either suspended or stopped.
+         */
+        ehci_prepare_ports_for_controller_suspend(ehci, device_may_wakeup(dev));
+        spin_lock_irqsave(&ehci->lock, flags);
+        ehci_writel(ehci, 0, &ehci->regs->intr_enable);
+        (void)ehci_readl(ehci, &ehci->regs->intr_enable);
+
+        clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
+        spin_unlock_irqrestore(&ehci->lock, flags);
+
+        /* could save FLADJ in case of Vaux power loss
+         * ... we'd only use it to handle clock skew
+         */
+
+        return rc;
+}
+
+static int ehci_hcd_sead3_drv_resume(struct device *dev)
+{
+        struct usb_hcd *hcd = dev_get_drvdata(dev);
+        struct ehci_hcd *ehci = hcd_to_ehci(hcd);
+
+        /* maybe restore FLADJ. */
+
+        if (time_before(jiffies, ehci->next_statechange))
+                msleep(100);
+
+        /* Mark hardware accessible again as we are out of D3 state by now */
+        set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
+
+        /* If CF is still set, we maintained PCI Vaux power.
+         * Just undo the effect of ehci_pci_suspend().
+         */
+        if (ehci_readl(ehci, &ehci->regs->configured_flag) == FLAG_CF) {
+                int     mask = INTR_MASK;
+
+                ehci_prepare_ports_for_controller_resume(ehci);
+                if (!hcd->self.root_hub->do_remote_wakeup)
+                        mask &= ~STS_PCD;
+                ehci_writel(ehci, mask, &ehci->regs->intr_enable);
+                ehci_readl(ehci, &ehci->regs->intr_enable);
+                return 0;
+        }
+
+        ehci_dbg(ehci, "lost power, restarting\n");
+        usb_root_hub_lost_power(hcd->self.root_hub);
+
+        /* Else reset, to cope with power loss or flush-to-storage
+         * style "resume" having let BIOS kick in during reboot.
+         */
+        (void) ehci_halt(ehci);
+        (void) ehci_reset(ehci);
+
+        /* emptying the schedule aborts any urbs */
+        spin_lock_irq(&ehci->lock);
+        if (ehci->reclaim)
+                end_unlink_async(ehci);
+        ehci_work(ehci);
+        spin_unlock_irq(&ehci->lock);
+
+        ehci_writel(ehci, ehci->command, &ehci->regs->command);
+        ehci_writel(ehci, FLAG_CF, &ehci->regs->configured_flag);
+        ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
+
+        /* here we "know" root ports should always stay powered */
+        ehci_port_power(ehci, 1);
+
+        ehci->rh_state = EHCI_RH_SUSPENDED;
+
+        return 0;
+}
+
+static const struct dev_pm_ops sead3_ehci_pmops = {
+        .suspend        = ehci_hcd_sead3_drv_suspend,
+        .resume         = ehci_hcd_sead3_drv_resume,
+};
+
+#define SEAD3_EHCI_PMOPS (&sead3_ehci_pmops)
+
+#else
+#define SEAD3_EHCI_PMOPS NULL
+#endif
+
+static struct platform_driver ehci_hcd_sead3_driver = {
+        .probe          = ehci_hcd_sead3_drv_probe,
+        .remove         = ehci_hcd_sead3_drv_remove,
+        .shutdown       = usb_hcd_platform_shutdown,
+        .driver = {
+                .name   = "sead3-ehci",
+                .owner  = THIS_MODULE,
+                .pm     = SEAD3_EHCI_PMOPS,
+        }
+};
+
+MODULE_ALIAS("platform:sead3-ehci");