usb: musb: Add 'extvbus' in musb_hdrc_platform_data

Some of the board might use external Vbus power supply on musb
interface which would require to program ULPI_BUSCONTROL register.

Adding 'extvbus' flag which can be set from such boards which will
be checked at musb driver files before programming ULPI_BUSCONTROL.

Signed-off-by: Ajay Kumar Gupta <ajay.gupta@ti.com>
Signed-off-by: Felipe Balbi <felipe.balbi@nokia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c
index 4c8962f..074d380 100644 (file)
--- a/drivers/usb/musb/musb_core.c
+++ b/drivers/usb/musb/musb_core.c
@@ -2031,6 +2031,7 @@ bad_config:
        /* host side needs more setup */
        if (is_host_enabled(musb)) {
                struct usb_hcd  *hcd = musb_to_hcd(musb);
+               u8 busctl;
 
                otg_set_host(musb->xceiv, &hcd->self);
 
@@ -2038,6 +2039,13 @@ bad_config:
                        hcd->self.otg_port = 1;
                musb->xceiv->host = &hcd->self;
                hcd->power_budget = 2 * (plat->power ? : 250);
+
+               /* program PHY to use external vBus if required */
+               if (plat->extvbus) {
+                       busctl = musb_readb(musb->mregs, MUSB_ULPI_BUSCONTROL);
+                       busctl |= MUSB_ULPI_USE_EXTVBUS;
+                       musb_writeb(musb->mregs, MUSB_ULPI_BUSCONTROL, busctl);
+               }
        }
 
        /* For the host-only role, we can activate right away.

diff --git a/drivers/usb/musb/musb_regs.h b/drivers/usb/musb/musb_regs.h
index 473a94e..9a8621a 100644 (file)
--- a/drivers/usb/musb/musb_regs.h
+++ b/drivers/usb/musb/musb_regs.h
@@ -72,6 +72,10 @@
 #define MUSB_DEVCTL_HR         0x02
 #define MUSB_DEVCTL_SESSION    0x01
 
+/* MUSB ULPI VBUSCONTROL */
+#define MUSB_ULPI_USE_EXTVBUS  0x01
+#define MUSB_ULPI_USE_EXTVBUSIND 0x02
+
 /* TESTMODE */
 #define MUSB_TEST_FORCE_HOST   0x80
 #define MUSB_TEST_FIFO_ACCESS  0x40
@@ -246,6 +250,7 @@
 
 /* REVISIT: vctrl/vstatus: optional vendor utmi+phy register at 0x68 */
 #define MUSB_HWVERS            0x6C    /* 8 bit */
+#define MUSB_ULPI_BUSCONTROL   0x70    /* 8 bit */
 
 #define MUSB_EPINFO            0x78    /* 8 bit */
 #define MUSB_RAMINFO           0x79    /* 8 bit */

diff --git a/include/linux/usb/musb.h b/include/linux/usb/musb.h
index d437556..4b7f8fa 100644 (file)
--- a/include/linux/usb/musb.h
+++ b/include/linux/usb/musb.h
@@ -76,6 +76,9 @@ struct musb_hdrc_platform_data {
        /* (HOST or OTG) msec/2 after VBUS on till power good */
        u8              potpgt;
 
+       /* (HOST or OTG) program PHY for external Vbus */
+       unsigned        extvbus:1;
+
        /* Power the device on or off */
        int             (*set_power)(int state);