1 files changed, 83 insertions, 0 deletions

diff --git a/drivers/usb/host/ehci-lpm.c b/drivers/usb/host/ehci-lpm.c
new file mode 100644
index 000000000000..b4d4d63c13ed
--- /dev/null
+++ b/drivers/usb/host/ehci-lpm.c
@@ -0,0 +1,83 @@
+/* ehci-lpm.c EHCI HCD LPM support code
+ * Copyright (c) 2008 - 2010,  Intel Corporation.
+ * Author: Jacob Pan <jacob.jun.pan@intel.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * 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.
+*/
+
+/* this file is part of ehci-hcd.c */
+static int ehci_lpm_set_da(struct ehci_hcd *ehci, int dev_addr, int port_num)
+{
+        u32 __iomem portsc;
+
+        ehci_dbg(ehci, "set dev address %d for port %d\n", dev_addr, port_num);
+        if (port_num > HCS_N_PORTS(ehci->hcs_params)) {
+                ehci_dbg(ehci, "invalid port number %d\n", port_num);
+                return -ENODEV;
+        }
+        portsc = ehci_readl(ehci, &ehci->regs->port_status[port_num-1]);
+        portsc &= ~PORT_DEV_ADDR;
+        portsc |= dev_addr<<25;
+        ehci_writel(ehci, portsc, &ehci->regs->port_status[port_num-1]);
+        return 0;
+}
+
+/*
+ * this function is used to check if the device support LPM
+ * if yes, mark the PORTSC register with PORT_LPM bit
+ */
+static int ehci_lpm_check(struct ehci_hcd *ehci, int port)
+{
+        u32 __iomem     *portsc ;
+        u32 val32;
+        int retval;
+
+        portsc = &ehci->regs->port_status[port-1];
+        val32 = ehci_readl(ehci, portsc);
+        if (!(val32 & PORT_DEV_ADDR)) {
+                ehci_dbg(ehci, "LPM: no device attached\n");
+                return -ENODEV;
+        }
+        val32 |= PORT_LPM;
+        ehci_writel(ehci, val32, portsc);
+        msleep(5);
+        val32 |= PORT_SUSPEND;
+        ehci_dbg(ehci, "Sending LPM 0x%08x to port %d\n", val32, port);
+        ehci_writel(ehci, val32, portsc);
+        /* wait for ACK */
+        msleep(10);
+        retval = handshake(ehci, &ehci->regs->port_status[port-1], PORT_SSTS,
+                        PORTSC_SUSPEND_STS_ACK, 125);
+        dbg_port(ehci, "LPM", port, val32);
+        if (retval != -ETIMEDOUT) {
+                ehci_dbg(ehci, "LPM: device ACK for LPM\n");
+                val32 |= PORT_LPM;
+                /*
+                 * now device should be in L1 sleep, let's wake up the device
+                 * so that we can complete enumeration.
+                 */
+                ehci_writel(ehci, val32, portsc);
+                msleep(10);
+                val32 |= PORT_RESUME;
+                ehci_writel(ehci, val32, portsc);
+        } else {
+                ehci_dbg(ehci, "LPM: device does not ACK, disable LPM %d\n",
+                        retval);
+                val32 &= ~PORT_LPM;
+                retval = -ETIMEDOUT;
+                ehci_writel(ehci, val32, portsc);
+        }
+
+        return retval;
+}