From: "Steven J. Hill" <sjhill@xxxxxxxx>
Add EHCI driver for MIPS SEAD-3 development platform.
Signed-off-by: Chris Dearman <chris@xxxxxxxx>
Signed-off-by: Steven J. Hill <sjhill@xxxxxxxx>
---
drivers/usb/host/Kconfig | 5 +-
drivers/usb/host/ehci-hcd.c | 5 +
drivers/usb/host/ehci-sead3.c | 259 +++++++++++++++++++++++++++++++++++++++++
3 files changed, 267 insertions(+), 2 deletions(-)
create mode 100644 drivers/usb/host/ehci-sead3.c
diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
index f788eb8..dde5a05 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 aede637..d082d9b 100644
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -1371,6 +1371,11 @@ 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 0000000..9e35663
--- /dev/null
+++ b/drivers/usb/host/ehci-sead3.c
@@ -0,0 +1,259 @@
+/*
+ * MIPS CI13320A EHCI Host Controller driver
+ * Based on "ehci-au1xxx.c" by K.Boge <karsten.boge@xxxxxxx>
+ *
+ * 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>
+
+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_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 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(&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;
+ }
+
+ ehci = hcd_to_ehci(hcd);
+ ehci->caps = hcd->regs + 0x100;
+ ehci->regs = hcd->regs + 0x100 +
+ HC_LENGTH(ehci, readl(&ehci->caps->hc_capbase));
+ /* cache this readonly data; minimize chip reads */
+ ehci->hcs_params = readl(&ehci->caps->hcs_params);
+
+ /* Root hub has integrated TT. */
+ hcd->has_tt = 1;
+
+ /* SEAD-3 EHCI matches CPU endianness. */
+#ifdef __BIG_ENDIAN
+ ehci->big_endian_mmio = 1;
+ ehci->big_endian_desc = 1;
+#endif
+
+ /* Set burst length to 16 words */
+ /* FIXME: should be tunable */
+ ehci_writel(ehci, 0x1010, &ehci->regs->reserved[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(10);
+
+ /* 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");
--
1.7.9.6
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