using a wrapper between the transceiver driver and the controller
driver to signal the controller driver to turn on/off the controller
when VBUS event is detected.
based-on: Heikki Krogerus <ext-heikki.krogerus@xxxxxxxxx>
Signed-off-by: Arnaud Mandy <ext-arnaud.2.mandy@xxxxxxxxx>
---
drivers/usb/musb/musb_core.c | 30 +++++++++++++++++-
drivers/usb/musb/musb_core.h | 17 +++++++++-
drivers/usb/musb/omap2430.c | 66 ++++++++++++++++++++++++++++++++++++++++-
drivers/usb/otg/otg.c | 16 ++++++++++
drivers/usb/otg/twl4030-usb.c | 2 +
include/linux/usb/otg.h | 11 +++++++
6 files changed, 137 insertions(+), 5 deletions(-)
diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c
index 2f59892..ab97a02 100644
--- a/drivers/usb/musb/musb_core.c
+++ b/drivers/usb/musb/musb_core.c
@@ -965,6 +965,8 @@ void musb_start(struct musb *musb)
}
musb_platform_enable(musb);
musb_writeb(regs, MUSB_DEVCTL, devctl);
+
+ musb_save_context(musb);
}
@@ -1948,6 +1950,25 @@ static void musb_free(struct musb *musb)
#endif
}
+int musb_power_controller(struct otg_controller *controller, bool vbus)
+{
+ struct musb *musb = dev_to_musb(controller->dev);
+
+ if (!musb->off_mode_support)
+ return 0;
+
+ if (vbus)
+ musb_power_on_controller(musb);
+ else
+ musb_power_off_controller(musb);
+
+ return 0;
+}
+
+struct otg_controller musb_controller = {
+ .power_controller = musb_power_controller,
+};
+
/*
* Perform generic per-controller initialization.
*
@@ -2044,6 +2065,9 @@ bad_config:
goto fail2;
}
+ musb_controller.dev = dev;
+ musb->xceiv->controller = &musb_controller;
+
#ifndef CONFIG_MUSB_PIO_ONLY
if (use_dma && dev->dma_mask) {
struct dma_controller *c;
@@ -2313,7 +2337,8 @@ void musb_save_context(struct musb *musb)
musb_writeb(musb_base, MUSB_INDEX, musb_context.index);
- musb_platform_save_context(musb, &musb_context);
+ if (!musb->off_mode)
+ musb_platform_save_context(musb, &musb_context);
}
void musb_restore_context(struct musb *musb)
@@ -2322,7 +2347,8 @@ void musb_restore_context(struct musb *musb)
void __iomem *musb_base = musb->mregs;
void __iomem *ep_target_regs;
- musb_platform_restore_context(musb, &musb_context);
+ if (!musb->off_mode)
+ musb_platform_restore_context(musb, &musb_context);
if (is_host_enabled(musb)) {
musb_writew(musb_base, MUSB_FRAME, musb_context.frame);
diff --git a/drivers/usb/musb/musb_core.h b/drivers/usb/musb/musb_core.h
index 1e3da4e..8105a47 100644
--- a/drivers/usb/musb/musb_core.h
+++ b/drivers/usb/musb/musb_core.h
@@ -448,6 +448,11 @@ struct musb {
struct usb_gadget g; /* the gadget */
struct usb_gadget_driver *gadget_driver; /* its driver */
#endif
+ /* true if off-mode is supported */
+ unsigned off_mode_support:1;
+
+ /* true if off-mode is requested */
+ unsigned off_mode:1;
/* true if we're using dma */
unsigned use_dma:1;
@@ -498,8 +503,16 @@ extern void musb_platform_restore_context(struct musb *musb,
#define musb_platform_save_context(m, x) do {} while (0)
#define musb_platform_restore_context(m, x) do {} while (0)
#endif
-
-#endif
+extern void musb_power_on_controller(struct musb *musb);
+extern void musb_power_off_controller(struct musb *musb);
+void musb_save_context(struct musb *musb);
+void musb_restore_context(struct musb *musb);
+#else
+static inline void musb_power_on_controller(struct musb *musb) {};
+static inline void musb_power_off_controller(struct musb *musb) {};
+static inline void musb_save_context(struct musb *musb) {};
+static inline void musb_restore_context(struct musb *musb) {};
+#endif /* CONFIG_PM */
static inline void musb_set_vbus(struct musb *musb, int is_on)
{
diff --git a/drivers/usb/musb/omap2430.c b/drivers/usb/musb/omap2430.c
index 21cff53..3cc894b 100644
--- a/drivers/usb/musb/omap2430.c
+++ b/drivers/usb/musb/omap2430.c
@@ -220,6 +220,9 @@ int __init musb_platform_init(struct musb *musb)
musb_platform_resume(musb);
+#ifdef CONFIG_PM
+ musb->off_mode_support = 1;
+#endif
l = musb_readl(musb->mregs, OTG_SYSCONFIG);
l &= ~ENABLEWAKEUP; /* disable wakeup */
l &= ~NOSTDBY; /* remove possible nostdby */
@@ -271,7 +274,68 @@ void musb_platform_restore_context(struct musb *musb,
musb_writel(musb->mregs, OTG_SYSCONFIG, musb_context->otg_sysconfig);
musb_writel(musb->mregs, OTG_FORCESTDBY, musb_context->otg_forcestandby);
}
-#endif
+
+void musb_power_off_controller(struct musb *musb)
+{
+ u32 l;
+
+ DBG(3, "allow OFF-mode\n");
+
+ l = musb_readl(musb->mregs, OTG_FORCESTDBY);
+ l |= ENABLEFORCE; /* enable MSTANDBY */
+ musb_writel(musb->mregs, OTG_FORCESTDBY, l);
+
+ l = musb_readl(musb->mregs, OTG_FORCESTDBY);
+ l |= ENABLEWAKEUP; /* enable wakeup */
+ l &= ~NOSTDBY; /* disable nostdby */
+ l |= SMARTSTDBY; /* enable smart standby */
+
+ l |= AUTOIDLE; /* enable auto idle */
+ l &= ~NOIDLE; /* disable noidle */
+ l |= SMARTIDLE; /* enable smart idle */
+
+ musb_writel(musb->mregs, OTG_SYSCONFIG, l);
+
+ if (!cpu_is_omap3430())
+ l |= AUTOIDLE; /* enable auto idle */
+ musb_writel(musb->mregs, OTG_SYSCONFIG, l);
+}
+EXPORT_SYMBOL_GPL(musb_power_off_controller);
+
+void musb_power_on_controller(struct musb *musb)
+{
+ u32 l;
+
+ DBG(3, "wake-up from OFF-mode\n");
+
+ l = musb_readl(musb->mregs, OTG_SYSCONFIG);
+ l &= ~ENABLEWAKEUP; /* disable wakeup */
+ musb_writel(musb->mregs, OTG_SYSCONFIG, l);
+
+ l = musb_readl(musb->mregs, OTG_FORCESTDBY);
+ l &= ~ENABLEFORCE; /* disable MSTANDBY */
+ musb_writel(musb->mregs, OTG_FORCESTDBY, l);
+
+ l = musb_readl(musb->mregs, OTG_SYSCONFIG);
+ l |= NOSTDBY; /* enable nostdby */
+ l &= ~SMARTSTDBY; /* disable smart standby */
+
+ l &= ~AUTOIDLE; /* disable auto idle */
+ l |= NOIDLE; /* enable noidle */
+ l &= ~SMARTIDLE; /* disable smart idle */
+ musb_writel(musb->mregs, OTG_SYSCONFIG, l);
+
+ l = musb_readl(musb->mregs, OTG_INTERFSEL);
+ l |= ULPI_12PIN;
+ musb_writel(musb->mregs, OTG_INTERFSEL, l);
+
+ /* Restore register context */
+ musb->off_mode = 1;
+ musb_restore_context(musb);
+ musb->off_mode = 0;
+}
+EXPORT_SYMBOL_GPL(musb_power_on_controller);
+#endif /* CONFIG_PM */
int musb_platform_suspend(struct musb *musb)
{
diff --git a/drivers/usb/otg/otg.c b/drivers/usb/otg/otg.c
index 0a43a7d..8ab45a7 100644
--- a/drivers/usb/otg/otg.c
+++ b/drivers/usb/otg/otg.c
@@ -64,3 +64,19 @@ int otg_set_transceiver(struct otg_transceiver *x)
return 0;
}
EXPORT_SYMBOL(otg_set_transceiver);
+
+/**
+ * otg_power_controller - control power on/off of tranceiver.
+ * @x: the USB OTG transceiver to be used; or NULL
+ * @vbus: VBUS presence.
+ * This call is to save and power off the usb controller based on
+ * VBUS level detected by the transceiver.
+ */
+int otg_power_controller(struct otg_transceiver *x, bool vbus)
+{
+ if (x->controller && x->controller->power_controller)
+ x->controller->power_controller(x->controller, vbus);
+ return 0;
+}
+EXPORT_SYMBOL(otg_power_controller);
+
diff --git a/drivers/usb/otg/twl4030-usb.c b/drivers/usb/otg/twl4030-usb.c
index 488b0a3..3aa84ea 100644
--- a/drivers/usb/otg/twl4030-usb.c
+++ b/drivers/usb/otg/twl4030-usb.c
@@ -503,6 +503,7 @@ static void twl4030_phy_suspend(struct twl4030_usb *twl, int controller_off)
twl4030_phy_power(twl, 0);
twl->asleep = 1;
+ otg_power_controller(&twl->otg, 0);
}
static void twl4030_phy_resume(struct twl4030_usb *twl)
@@ -516,6 +517,7 @@ static void twl4030_phy_resume(struct twl4030_usb *twl)
if (twl->usb_mode == T2_USB_MODE_ULPI)
twl4030_i2c_access(twl, 0);
twl->asleep = 0;
+ otg_power_controller(&twl->otg, 1);
}
static int twl4030_usb_ldo_init(struct twl4030_usb *twl)
diff --git a/include/linux/usb/otg.h b/include/linux/usb/otg.h
index e328a89..77c4bdc 100644
--- a/include/linux/usb/otg.h
+++ b/include/linux/usb/otg.h
@@ -60,6 +60,14 @@ struct otg_io_access_ops {
int (*write)(struct otg_transceiver *otg, u32 val, u32 reg);
};
+/* the otg driver needs to inform the usb controller driver when vbus
+ * is present or not.
+ */
+struct otg_controller {
+ struct device *dev;
+ int (*power_controller)(struct otg_controller *otg, bool vbus);
+};
+
/*
* the otg driver needs to interact with both device side and host side
* usb controllers. it decides which controller is active at a given
@@ -93,6 +101,8 @@ struct otg_transceiver {
u16 port_status;
u16 port_change;
+ struct otg_controller *controller;
+
/* initialize/shutdown the OTG controller */
int (*init)(struct otg_transceiver *otg);
void (*shutdown)(struct otg_transceiver *otg);
@@ -171,6 +181,7 @@ otg_shutdown(struct otg_transceiver *otg)
/* for usb host and peripheral controller drivers */
extern struct otg_transceiver *otg_get_transceiver(void);
extern void otg_put_transceiver(struct otg_transceiver *);
+extern int otg_power_controller(struct otg_transceiver *, bool);
/* Context: can sleep */
static inline int
--
1.6.0.4
--
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