usb: ehci: add ehci_port_power interface

The current EHCI implementation is prepared to toggle the
PORT_POWER bit to enable or disable a USB-Port. In some
cases this port power can not be just toggled by the PORT_POWER
bit, and the gpio-regulator is needed to be toggled too.

This patch defines a port power control interface ehci_port_power for
ehci core use, it toggles PORT_POWER bit as well as calls platform
defined .port_power if it is defined.

Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
Signed-off-by: Peter Chen <peter.chen@freescale.com>
Acked-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

4 files changed, 45 insertions, 14 deletions

diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
index 15feaf924b71..df75b8e7d157 100644
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -311,6 +311,7 @@ static void unlink_empty_async_suspended(struct ehci_hcd *ehci);
 static void ehci_work(struct ehci_hcd *ehci);
 static void start_unlink_intr(struct ehci_hcd *ehci, struct ehci_qh *qh);
 static void end_unlink_intr(struct ehci_hcd *ehci, struct ehci_qh *qh);
+static int ehci_port_power(struct ehci_hcd *ehci, int portnum, bool enable);
 
 #include "ehci-timer.c"
 #include "ehci-hub.c"
@@ -329,9 +330,13 @@ static void ehci_turn_off_all_ports(struct ehci_hcd *ehci)
 {
         int     port = HCS_N_PORTS(ehci->hcs_params);
 
-        while (port--)
+        while (port--) {
                 ehci_writel(ehci, PORT_RWC_BITS,
                                 &ehci->regs->port_status[port]);
+                spin_unlock_irq(&ehci->lock);
+                ehci_port_power(ehci, port, false);
+                spin_lock_irq(&ehci->lock);
+        }
 }
 
 /*
@@ -1233,6 +1238,8 @@ void ehci_init_driver(struct hc_driver *drv,
                 drv->hcd_priv_size += over->extra_priv_size;
                 if (over->reset)
                         drv->reset = over->reset;
+                if (over->port_power)
+                        drv->port_power = over->port_power;
         }
 }
 EXPORT_SYMBOL_GPL(ehci_init_driver);
diff --git a/drivers/usb/host/ehci-hub.c b/drivers/usb/host/ehci-hub.c
index 5728829cf6ef..118edb7bdca2 100644
--- a/drivers/usb/host/ehci-hub.c
+++ b/drivers/usb/host/ehci-hub.c
@@ -69,10 +69,8 @@ static void ehci_handover_companion_ports(struct ehci_hcd *ehci)
                 if (test_bit(port, &ehci->owned_ports)) {
                         reg = &ehci->regs->port_status[port];
                         status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
-                        if (!(status & PORT_POWER)) {
-                                status |= PORT_POWER;
-                                ehci_writel(ehci, status, reg);
-                        }
+                        if (!(status & PORT_POWER))
+                                ehci_port_power(ehci, port, true);
                 }
         }
 
@@ -952,9 +950,11 @@ int ehci_hub_control(
                         clear_bit(wIndex, &ehci->port_c_suspend);
                         break;
                 case USB_PORT_FEAT_POWER:
-                        if (HCS_PPC (ehci->hcs_params))
-                                ehci_writel(ehci, temp & ~PORT_POWER,
-                                                status_reg);
+                        if (HCS_PPC(ehci->hcs_params)) {
+                                spin_unlock_irqrestore(&ehci->lock, flags);
+                                ehci_port_power(ehci, wIndex, false);
+                                spin_lock_irqsave(&ehci->lock, flags);
+                        }
                         break;
                 case USB_PORT_FEAT_C_CONNECTION:
                         ehci_writel(ehci, temp | PORT_CSC, status_reg);
@@ -1004,9 +1004,9 @@ int ehci_hub_control(
                          */
                         if (((temp & PORT_OC) || (ehci->need_oc_pp_cycle))
                                         && HCS_PPC(ehci->hcs_params)) {
-                                ehci_writel(ehci,
-                                        temp & ~(PORT_RWC_BITS | PORT_POWER),
-                                        status_reg);
+                                spin_unlock_irqrestore(&ehci->lock, flags);
+                                ehci_port_power(ehci, wIndex, false);
+                                spin_lock_irqsave(&ehci->lock, flags);
                                 temp = ehci_readl(ehci, status_reg);
                         }
                 }
@@ -1187,9 +1187,11 @@ int ehci_hub_control(
                         set_bit(wIndex, &ehci->suspended_ports);
                         break;
                 case USB_PORT_FEAT_POWER:
-                        if (HCS_PPC (ehci->hcs_params))
-                                ehci_writel(ehci, temp | PORT_POWER,
-                                                status_reg);
+                        if (HCS_PPC(ehci->hcs_params)) {
+                                spin_unlock_irqrestore(&ehci->lock, flags);
+                                ehci_port_power(ehci, wIndex, true);
+                                spin_lock_irqsave(&ehci->lock, flags);
+                        }
                         break;
                 case USB_PORT_FEAT_RESET:
                         if (temp & (PORT_SUSPEND|PORT_RESUME))
@@ -1297,3 +1299,20 @@ static int ehci_port_handed_over(struct usb_hcd *hcd, int portnum)
         reg = &ehci->regs->port_status[portnum - 1];
         return ehci_readl(ehci, reg) & PORT_OWNER;
 }
+
+static int ehci_port_power(struct ehci_hcd *ehci, int portnum, bool enable)
+{
+        struct usb_hcd *hcd = ehci_to_hcd(ehci);
+        u32 __iomem *status_reg = &ehci->regs->port_status[portnum];
+        u32 temp = ehci_readl(ehci, status_reg) & ~PORT_RWC_BITS;
+
+        if (enable)
+                ehci_writel(ehci, temp | PORT_POWER, status_reg);
+        else
+                ehci_writel(ehci, temp & ~PORT_POWER, status_reg);
+
+        if (hcd->driver->port_power)
+                hcd->driver->port_power(hcd, portnum, enable);
+
+        return 0;
+}
diff --git a/drivers/usb/host/ehci.h b/drivers/usb/host/ehci.h
index eee228a26a0e..6f0577b0a5ae 100644
--- a/drivers/usb/host/ehci.h
+++ b/drivers/usb/host/ehci.h
@@ -859,6 +859,8 @@ static inline u32 hc32_to_cpup (const struct ehci_hcd *ehci, const __hc32 *x)
 struct ehci_driver_overrides {
         size_t          extra_priv_size;
         int             (*reset)(struct usb_hcd *hcd);
+        int             (*port_power)(struct usb_hcd *hcd,
+                                int portnum, bool enable);
 };
 
 extern void     ehci_init_driver(struct hc_driver *drv,
diff --git a/include/linux/usb/hcd.h b/include/linux/usb/hcd.h
index cd96a2bc3388..9cf7e3594609 100644
--- a/include/linux/usb/hcd.h
+++ b/include/linux/usb/hcd.h
@@ -379,6 +379,9 @@ struct hc_driver {
         int     (*disable_usb3_lpm_timeout)(struct usb_hcd *,
                         struct usb_device *, enum usb3_link_state state);
         int     (*find_raw_port_number)(struct usb_hcd *, int);
+        /* Call for power on/off the port if necessary */
+        int     (*port_power)(struct usb_hcd *hcd, int portnum, bool enable);
+
 };
 
 static inline int hcd_giveback_urb_in_bh(struct usb_hcd *hcd)