[PATCH v2 0/4] Add MediaTek MUSB Controller Driver

[PATCH v2 0/4] Add MediaTek MUSB Controller Driver

[min.guo]

From: Min Guo <min.guo@mediatek.com>

These patches introduce the MediaTek MUSB controller driver.

The driver can be configured as Dual-Role Device (DRD),
Peripheral Only and Host Only modes. This has beed tested on
MT2701 with a variety of devices in host mode and with the 
f_mass gadget driver in peripheral mode, plugging otg cables
in/out a lot of times in all possible imaginable plug orders.

changes in v2:
changes of dt-bindings suggested by Rob and Bin:
1. Modify DRC to DRD
2. Drop the "<soc-model>-musb" in compatible
3. Remove phy-names
4. Add space after comma in clock-names
dtsi:
1. Remove phy-names
changes of driver suggested by Bin:
1. Add a new patch for musb_set_toggle
2. Add summarize of MediaTek musb controller differences in the commit log
3. Abondon patch "usb: musb: Move musbhsdma macro definition to musb_dma.h"
4. Add "|| COMPILE_TEST" in Kconfig
5. Add musb_clearb() and musb_clearw() hooks
6. Add get_toggle() and set_toggle() hooks
7. Replace musb_readl() with musb_readw() to read 16bit toggle register
8. Move MediaTek's private toggle registers from musb_regs.h to mediatek.c
9. Create musbhs_dma_controller_create_noirq()

Min Guo (4):
  dt-bindings: usb: musb: Add support for MediaTek musb controller
  arm: dts: mt2701: Add usb2 device nodes
  usb: musb: Extract set toggle as a separate interface
  usb: musb: Add support for MediaTek musb controller

 .../devicetree/bindings/usb/mediatek,musb.txt      |  43 ++
 arch/arm/boot/dts/mt2701-evb.dts                   |  21 +
 arch/arm/boot/dts/mt2701.dtsi                      |  33 ++
 drivers/usb/musb/Kconfig                           |   8 +-
 drivers/usb/musb/Makefile                          |   1 +
 drivers/usb/musb/mediatek.c                        | 617 +++++++++++++++++++++
 drivers/usb/musb/musb_core.c                       |  69 +++
 drivers/usb/musb/musb_core.h                       |   9 +
 drivers/usb/musb/musb_dma.h                        |   9 +
 drivers/usb/musb/musb_host.c                       |  35 +-
 drivers/usb/musb/musb_io.h                         |   6 +
 drivers/usb/musb/musbhsdma.c                       |  55 +-
 12 files changed, 868 insertions(+), 38 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/usb/mediatek,musb.txt
 create mode 100644 drivers/usb/musb/mediatek.c

-- 
1.9.1

[PATCH v2 1/4] dt-bindings: usb: musb: Add support for MediaTek musb controller

[min.guo]

From: Min Guo <min.guo@mediatek.com>

This adds support for MediaTek musb controller in
host, peripheral and otg mode.

Signed-off-by: Min Guo <min.guo@mediatek.com>
---
 .../devicetree/bindings/usb/mediatek,musb.txt      | 43 ++++++++++++++++++++++
 1 file changed, 43 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/usb/mediatek,musb.txt

diff --git a/Documentation/devicetree/bindings/usb/mediatek,musb.txt b/Documentation/devicetree/bindings/usb/mediatek,musb.txt
new file mode 100644
index 0000000..3e3f671
--- /dev/null
+++ b/Documentation/devicetree/bindings/usb/mediatek,musb.txt
@@ -0,0 +1,43 @@
+MediaTek musb DRD/OTG controller
+-------------------------------------------
+
+Required properties:
+ - compatible      : should be "mediatek,mtk-musb"
+ - reg             : specifies physical base address and size of
+   the registers
+ - interrupts      : interrupt used by musb controller
+ - interrupt-names : must be "mc"
+ - phys            : PHY specifier for the OTG phy
+ - dr_mode         : should be one of "host", "peripheral" or "otg",
+   refer to usb/generic.txt
+ - clocks          : a list of phandle + clock-specifier pairs, one for
+   each entry in clock-names
+ - clock-names     : must contain "main", "mcu", "univpll"
+   for clocks of controller
+
+Optional properties:
+ - extcon : external connector for VBUS and IDPIN changes detection,
+   needed when supports dual-role mode.
+ - vbus-supply : reference to the VBUS regulator, needed when supports
+   dual-role mode.
+ - power-domains   : a phandle to USB power domain node to control USB's
+   MTCMOS
+
+Example:
+
+usb2: usb@11200000 {
+	compatible = "mediatek,mt2701-musb",
+		     "mediatek,mtk-musb";
+	reg = <0 0x11200000 0 0x1000>;
+	interrupts = <GIC_SPI 32 IRQ_TYPE_LEVEL_LOW>;
+	interrupt-names = "mc";
+	phys = <&u2port2 PHY_TYPE_USB2>;
+	vbus-supply = <&usb_vbus>;
+	extcon = <&extcon_usb>;
+	dr_mode = "otg";
+	clocks = <&pericfg CLK_PERI_USB0>,
+		 <&pericfg CLK_PERI_USB0_MCU>,
+		 <&pericfg CLK_PERI_USB_SLV>;
+	clock-names = "main","mcu","univpll";
+	power-domains = <&scpsys MT2701_POWER_DOMAIN_IFR_MSC>;
+};
-- 
1.9.1

[PATCH v2 2/4] arm: dts: mt2701: Add usb2 device nodes

[min.guo]

From: Min Guo <min.guo@mediatek.com>

Add musb nodes and usb2 phy nodes for MT2701

Signed-off-by: Min Guo <min.guo@mediatek.com>
---
 arch/arm/boot/dts/mt2701-evb.dts | 21 +++++++++++++++++++++
 arch/arm/boot/dts/mt2701.dtsi    | 33 +++++++++++++++++++++++++++++++++
 2 files changed, 54 insertions(+)

diff --git a/arch/arm/boot/dts/mt2701-evb.dts b/arch/arm/boot/dts/mt2701-evb.dts
index be0edb3..2635911 100644
--- a/arch/arm/boot/dts/mt2701-evb.dts
+++ b/arch/arm/boot/dts/mt2701-evb.dts
@@ -6,6 +6,7 @@
  */
 
 /dts-v1/;
+#include <dt-bindings/gpio/gpio.h>
 #include "mt2701.dtsi"
 
 / {
@@ -60,6 +61,20 @@
 		>;
 		default-brightness-level = <9>;
 	};
+
+	extcon_usb: extcon_iddig {
+		compatible = "linux,extcon-usb-gpio";
+		id-gpio = <&pio 44 GPIO_ACTIVE_HIGH>;
+	};
+
+	usb_vbus: regulator@0 {
+		compatible = "regulator-fixed";
+		regulator-name = "usb_vbus";
+		regulator-min-microvolt = <5000000>;
+		regulator-max-microvolt = <5000000>;
+		gpio = <&pio 45 GPIO_ACTIVE_HIGH>;
+		enable-active-high;
+	};
 };
 
 &auxadc {
@@ -229,3 +244,9 @@
 &uart0 {
 	status = "okay";
 };
+
+&usb2 {
+	vbus-supply = <&usb_vbus>;
+	extcon = <&extcon_usb>;
+	status = "okay";
+};
diff --git a/arch/arm/boot/dts/mt2701.dtsi b/arch/arm/boot/dts/mt2701.dtsi
index 180377e..a6b1434 100644
--- a/arch/arm/boot/dts/mt2701.dtsi
+++ b/arch/arm/boot/dts/mt2701.dtsi
@@ -670,6 +670,39 @@
 		};
 	};
 
+	usb2: usb@11200000 {
+		compatible = "mediatek,mt2701-musb",
+			     "mediatek,mtk-musb";
+		reg = <0 0x11200000 0 0x1000>;
+		interrupts = <GIC_SPI 32 IRQ_TYPE_LEVEL_LOW>;
+		interrupt-names = "mc";
+		phys = <&u2port2 PHY_TYPE_USB2>;
+		dr_mode = "otg";
+		clocks = <&pericfg CLK_PERI_USB0>,
+			 <&pericfg CLK_PERI_USB0_MCU>,
+			 <&pericfg CLK_PERI_USB_SLV>;
+		clock-names = "main","mcu","univpll";
+		power-domains = <&scpsys MT2701_POWER_DOMAIN_IFR_MSC>;
+		status = "disabled";
+	};
+
+	u2phy0: usb-phy@11210000 {
+		compatible = "mediatek,generic-tphy-v1";
+		reg = <0 0x11210000 0 0x0800>;
+		#address-cells = <2>;
+		#size-cells = <2>;
+		ranges;
+		status = "okay";
+
+		u2port2: usb-phy@1a1c4800 {
+			reg = <0 0x11210800 0 0x0100>;
+			clocks = <&topckgen CLK_TOP_USB_PHY48M>;
+			clock-names = "ref";
+			#phy-cells = <1>;
+			status = "okay";
+		};
+	};
+
 	ethsys: syscon@1b000000 {
 		compatible = "mediatek,mt2701-ethsys", "syscon";
 		reg = <0 0x1b000000 0 0x1000>;
-- 
1.9.1

[PATCH v2 3/4] usb: musb: Extract set toggle as a separate interface

[min.guo]

From: Min Guo <min.guo@mediatek.com>

Add a common interface for set data toggle

Signed-off-by: Min Guo <min.guo@mediatek.com>
---
 drivers/usb/musb/musb_host.c | 37 +++++++++++++++++++++++--------------
 1 file changed, 23 insertions(+), 14 deletions(-)

diff --git a/drivers/usb/musb/musb_host.c b/drivers/usb/musb/musb_host.c
index b59ce9a..16d0ba4 100644
--- a/drivers/usb/musb/musb_host.c
+++ b/drivers/usb/musb/musb_host.c
@@ -306,6 +306,25 @@ static inline void musb_save_toggle(struct musb_qh *qh, int is_in,
 	usb_settoggle(urb->dev, qh->epnum, !is_in, csr ? 1 : 0);
 }
 
+static inline u16 musb_set_toggle(struct musb_qh *qh, int is_in,
+	struct urb *urb)
+{
+	u16 csr = 0;
+	u16 toggle = 0;
+
+	toggle = usb_gettoggle(urb->dev, qh->epnum, !is_in);
+
+	if (is_in)
+		csr = toggle ? (MUSB_RXCSR_H_WR_DATATOGGLE
+				| MUSB_RXCSR_H_DATATOGGLE) : 0;
+	else
+		csr = toggle ? (MUSB_TXCSR_H_WR_DATATOGGLE
+				| MUSB_TXCSR_H_DATATOGGLE)
+				: MUSB_TXCSR_CLRDATATOG;
+
+	return csr;
+}
+
 /*
  * Advance this hardware endpoint's queue, completing the specified URB and
  * advancing to either the next URB queued to that qh, or else invalidating
@@ -772,13 +791,8 @@ static void musb_ep_program(struct musb *musb, u8 epnum,
 					);
 			csr |= MUSB_TXCSR_MODE;
 
-			if (!hw_ep->tx_double_buffered) {
-				if (usb_gettoggle(urb->dev, qh->epnum, 1))
-					csr |= MUSB_TXCSR_H_WR_DATATOGGLE
-						| MUSB_TXCSR_H_DATATOGGLE;
-				else
-					csr |= MUSB_TXCSR_CLRDATATOG;
-			}
+			if (!hw_ep->tx_double_buffered)
+				csr |= musb_set_toggle(qh, !is_out, urb);
 
 			musb_writew(epio, MUSB_TXCSR, csr);
 			/* REVISIT may need to clear FLUSHFIFO ... */
@@ -860,17 +874,12 @@ static void musb_ep_program(struct musb *musb, u8 epnum,
 
 	/* IN/receive */
 	} else {
-		u16	csr;
+		u16 csr = 0;
 
 		if (hw_ep->rx_reinit) {
 			musb_rx_reinit(musb, qh, epnum);
+			csr |= musb_set_toggle(qh, !is_out, urb);
 
-			/* init new state: toggle and NYET, maybe DMA later */
-			if (usb_gettoggle(urb->dev, qh->epnum, 0))
-				csr = MUSB_RXCSR_H_WR_DATATOGGLE
-					| MUSB_RXCSR_H_DATATOGGLE;
-			else
-				csr = 0;
 			if (qh->type == USB_ENDPOINT_XFER_INT)
 				csr |= MUSB_RXCSR_DISNYET;
 
-- 
1.9.1

Re: [PATCH v2 3/4] usb: musb: Extract set toggle as a separate interface

[Matthias Brugger]

On 15/01/2019 02:43, min.guo@mediatek.com wrote:
> From: Min Guo <min.guo@mediatek.com>
> 
> Add a common interface for set data toggle
> 
> Signed-off-by: Min Guo <min.guo@mediatek.com>
> ---
>  drivers/usb/musb/musb_host.c | 37 +++++++++++++++++++++++--------------
>  1 file changed, 23 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/usb/musb/musb_host.c b/drivers/usb/musb/musb_host.c
> index b59ce9a..16d0ba4 100644
> --- a/drivers/usb/musb/musb_host.c
> +++ b/drivers/usb/musb/musb_host.c
> @@ -306,6 +306,25 @@ static inline void musb_save_toggle(struct musb_qh *qh, int is_in,
>  	usb_settoggle(urb->dev, qh->epnum, !is_in, csr ? 1 : 0);
>  }
>  
> +static inline u16 musb_set_toggle(struct musb_qh *qh, int is_in,
> +	struct urb *urb)
> +{
> +	u16 csr = 0;
> +	u16 toggle = 0;
> +
> +	toggle = usb_gettoggle(urb->dev, qh->epnum, !is_in);
> +
> +	if (is_in)
> +		csr = toggle ? (MUSB_RXCSR_H_WR_DATATOGGLE
> +				| MUSB_RXCSR_H_DATATOGGLE) : 0;
> +	else
> +		csr = toggle ? (MUSB_TXCSR_H_WR_DATATOGGLE
> +				| MUSB_TXCSR_H_DATATOGGLE)
> +				: MUSB_TXCSR_CLRDATATOG;

Can we switch the if and use is_out logic as function parameter. This would make
the code easier to understand.

Regards,
Matthias

> +
> +	return csr;
> +}
> +
>  /*
>   * Advance this hardware endpoint's queue, completing the specified URB and
>   * advancing to either the next URB queued to that qh, or else invalidating
> @@ -772,13 +791,8 @@ static void musb_ep_program(struct musb *musb, u8 epnum,
>  					);
>  			csr |= MUSB_TXCSR_MODE;
>  
> -			if (!hw_ep->tx_double_buffered) {
> -				if (usb_gettoggle(urb->dev, qh->epnum, 1))
> -					csr |= MUSB_TXCSR_H_WR_DATATOGGLE
> -						| MUSB_TXCSR_H_DATATOGGLE;
> -				else
> -					csr |= MUSB_TXCSR_CLRDATATOG;
> -			}
> +			if (!hw_ep->tx_double_buffered)
> +				csr |= musb_set_toggle(qh, !is_out, urb);
>  
>  			musb_writew(epio, MUSB_TXCSR, csr);
>  			/* REVISIT may need to clear FLUSHFIFO ... */
> @@ -860,17 +874,12 @@ static void musb_ep_program(struct musb *musb, u8 epnum,
>  
>  	/* IN/receive */
>  	} else {
> -		u16	csr;
> +		u16 csr = 0;
>  
>  		if (hw_ep->rx_reinit) {
>  			musb_rx_reinit(musb, qh, epnum);
> +			csr |= musb_set_toggle(qh, !is_out, urb);
>  
> -			/* init new state: toggle and NYET, maybe DMA later */
> -			if (usb_gettoggle(urb->dev, qh->epnum, 0))
> -				csr = MUSB_RXCSR_H_WR_DATATOGGLE
> -					| MUSB_RXCSR_H_DATATOGGLE;
> -			else
> -				csr = 0;
>  			if (qh->type == USB_ENDPOINT_XFER_INT)
>  				csr |= MUSB_RXCSR_DISNYET;
>  
> 

Re: [PATCH v2 3/4] usb: musb: Extract set toggle as a separate interface

[Bin Liu]

Hi Min,

On Tue, Jan 15, 2019 at 04:19:42PM +0100, Matthias Brugger wrote:
> 
> 
> On 15/01/2019 02:43, min.guo@mediatek.com wrote:
> > From: Min Guo <min.guo@mediatek.com>
> > 
> > Add a common interface for set data toggle
> > 
> > Signed-off-by: Min Guo <min.guo@mediatek.com>
> > ---
> >  drivers/usb/musb/musb_host.c | 37 +++++++++++++++++++++++--------------
> >  1 file changed, 23 insertions(+), 14 deletions(-)
> > 
> > diff --git a/drivers/usb/musb/musb_host.c b/drivers/usb/musb/musb_host.c
> > index b59ce9a..16d0ba4 100644
> > --- a/drivers/usb/musb/musb_host.c
> > +++ b/drivers/usb/musb/musb_host.c
> > @@ -306,6 +306,25 @@ static inline void musb_save_toggle(struct musb_qh *qh, int is_in,
> >  	usb_settoggle(urb->dev, qh->epnum, !is_in, csr ? 1 : 0);
> >  }
> >  
> > +static inline u16 musb_set_toggle(struct musb_qh *qh, int is_in,
> > +	struct urb *urb)
> > +{
> > +	u16 csr = 0;
> > +	u16 toggle = 0;
> > +
> > +	toggle = usb_gettoggle(urb->dev, qh->epnum, !is_in);
> > +
> > +	if (is_in)
> > +		csr = toggle ? (MUSB_RXCSR_H_WR_DATATOGGLE
> > +				| MUSB_RXCSR_H_DATATOGGLE) : 0;
> > +	else
> > +		csr = toggle ? (MUSB_TXCSR_H_WR_DATATOGGLE
> > +				| MUSB_TXCSR_H_DATATOGGLE)
> > +				: MUSB_TXCSR_CLRDATATOG;
> 
> Can we switch the if and use is_out logic as function parameter. This would make
> the code easier to understand.

based on the current implementation in patch 4/4, I don't think we need
this separate patch any more, but Matthias' comments still apply.

Regards,
-Bin.

Re: [PATCH v2 3/4] usb: musb: Extract set toggle as a separate interface

[Min Guo]

Hi Bin,

On Tue, 2019-01-15 at 14:40 -0600, Bin Liu wrote:
> Hi Min,
> 
> On Tue, Jan 15, 2019 at 04:19:42PM +0100, Matthias Brugger wrote:
> > 
> > 
> > On 15/01/2019 02:43, min.guo@mediatek.com wrote:
> > > From: Min Guo <min.guo@mediatek.com>
> > > 
> > > Add a common interface for set data toggle
> > > 
> > > Signed-off-by: Min Guo <min.guo@mediatek.com>
> > > ---
> > >  drivers/usb/musb/musb_host.c | 37 +++++++++++++++++++++++--------------
> > >  1 file changed, 23 insertions(+), 14 deletions(-)
> > > 
> > > diff --git a/drivers/usb/musb/musb_host.c b/drivers/usb/musb/musb_host.c
> > > index b59ce9a..16d0ba4 100644
> > > --- a/drivers/usb/musb/musb_host.c
> > > +++ b/drivers/usb/musb/musb_host.c
> > > @@ -306,6 +306,25 @@ static inline void musb_save_toggle(struct musb_qh *qh, int is_in,
> > >  	usb_settoggle(urb->dev, qh->epnum, !is_in, csr ? 1 : 0);
> > >  }
> > >  
> > > +static inline u16 musb_set_toggle(struct musb_qh *qh, int is_in,
> > > +	struct urb *urb)
> > > +{
> > > +	u16 csr = 0;
> > > +	u16 toggle = 0;
> > > +
> > > +	toggle = usb_gettoggle(urb->dev, qh->epnum, !is_in);
> > > +
> > > +	if (is_in)
> > > +		csr = toggle ? (MUSB_RXCSR_H_WR_DATATOGGLE
> > > +				| MUSB_RXCSR_H_DATATOGGLE) : 0;
> > > +	else
> > > +		csr = toggle ? (MUSB_TXCSR_H_WR_DATATOGGLE
> > > +				| MUSB_TXCSR_H_DATATOGGLE)
> > > +				: MUSB_TXCSR_CLRDATATOG;
> > 
> > Can we switch the if and use is_out logic as function parameter. This would make
> > the code easier to understand.
> 
> based on the current implementation in patch 4/4, I don't think we need
> this separate patch any more, but Matthias' comments still apply.

Okay.

> Regards,
> -Bin.

Re: [PATCH v2 3/4] usb: musb: Extract set toggle as a separate interface

[Min Guo]

Hi Matthias,

On Tue, 2019-01-15 at 16:19 +0100, Matthias Brugger wrote:
> 
> On 15/01/2019 02:43, min.guo@mediatek.com wrote:
> > From: Min Guo <min.guo@mediatek.com>
> > 
> > Add a common interface for set data toggle
> > 
> > Signed-off-by: Min Guo <min.guo@mediatek.com>
> > ---
> >  drivers/usb/musb/musb_host.c | 37 +++++++++++++++++++++++--------------
> >  1 file changed, 23 insertions(+), 14 deletions(-)
> > 
> > diff --git a/drivers/usb/musb/musb_host.c b/drivers/usb/musb/musb_host.c
> > index b59ce9a..16d0ba4 100644
> > --- a/drivers/usb/musb/musb_host.c
> > +++ b/drivers/usb/musb/musb_host.c
> > @@ -306,6 +306,25 @@ static inline void musb_save_toggle(struct musb_qh *qh, int is_in,
> >  	usb_settoggle(urb->dev, qh->epnum, !is_in, csr ? 1 : 0);
> >  }
> >  
> > +static inline u16 musb_set_toggle(struct musb_qh *qh, int is_in,
> > +	struct urb *urb)
> > +{
> > +	u16 csr = 0;
> > +	u16 toggle = 0;
> > +
> > +	toggle = usb_gettoggle(urb->dev, qh->epnum, !is_in);
> > +
> > +	if (is_in)
> > +		csr = toggle ? (MUSB_RXCSR_H_WR_DATATOGGLE
> > +				| MUSB_RXCSR_H_DATATOGGLE) : 0;
> > +	else
> > +		csr = toggle ? (MUSB_TXCSR_H_WR_DATATOGGLE
> > +				| MUSB_TXCSR_H_DATATOGGLE)
> > +				: MUSB_TXCSR_CLRDATATOG;
> 
> Can we switch the if and use is_out logic as function parameter. This would make
> the code easier to understand.

Okay.

> Regards,
> Matthias
> 
> > +
> > +	return csr;
> > +}
> > +
> >  /*
> >   * Advance this hardware endpoint's queue, completing the specified URB and
> >   * advancing to either the next URB queued to that qh, or else invalidating
> > @@ -772,13 +791,8 @@ static void musb_ep_program(struct musb *musb, u8 epnum,
> >  					);
> >  			csr |= MUSB_TXCSR_MODE;
> >  
> > -			if (!hw_ep->tx_double_buffered) {
> > -				if (usb_gettoggle(urb->dev, qh->epnum, 1))
> > -					csr |= MUSB_TXCSR_H_WR_DATATOGGLE
> > -						| MUSB_TXCSR_H_DATATOGGLE;
> > -				else
> > -					csr |= MUSB_TXCSR_CLRDATATOG;
> > -			}
> > +			if (!hw_ep->tx_double_buffered)
> > +				csr |= musb_set_toggle(qh, !is_out, urb);
> >  
> >  			musb_writew(epio, MUSB_TXCSR, csr);
> >  			/* REVISIT may need to clear FLUSHFIFO ... */
> > @@ -860,17 +874,12 @@ static void musb_ep_program(struct musb *musb, u8 epnum,
> >  
> >  	/* IN/receive */
> >  	} else {
> > -		u16	csr;
> > +		u16 csr = 0;
> >  
> >  		if (hw_ep->rx_reinit) {
> >  			musb_rx_reinit(musb, qh, epnum);
> > +			csr |= musb_set_toggle(qh, !is_out, urb);
> >  
> > -			/* init new state: toggle and NYET, maybe DMA later */
> > -			if (usb_gettoggle(urb->dev, qh->epnum, 0))
> > -				csr = MUSB_RXCSR_H_WR_DATATOGGLE
> > -					| MUSB_RXCSR_H_DATATOGGLE;
> > -			else
> > -				csr = 0;
> >  			if (qh->type == USB_ENDPOINT_XFER_INT)
> >  				csr |= MUSB_RXCSR_DISNYET;
> >  
> > 

[PATCH v2 4/4] usb: musb: Add support for MediaTek musb controller

[min.guo]

From: Min Guo <min.guo@mediatek.com>

This adds support for MediaTek musb controller in
host, peripheral and otg mode.
There are some quirk of MediaTek musb controller, such as:
 -W1C interrupt status registers
 -Private data toggle registers
 -No dedicated DMA interrupt line

Signed-off-by: Min Guo <min.guo@mediatek.com>
Signed-off-by: Yonglong Wu <yonglong.wu@mediatek.com>
---
 drivers/usb/musb/Kconfig     |   8 +-
 drivers/usb/musb/Makefile    |   1 +
 drivers/usb/musb/mediatek.c  | 617 +++++++++++++++++++++++++++++++++++++++++++
 drivers/usb/musb/musb_core.c |  69 +++++
 drivers/usb/musb/musb_core.h |   9 +
 drivers/usb/musb/musb_dma.h  |   9 +
 drivers/usb/musb/musb_host.c |  26 +-
 drivers/usb/musb/musb_io.h   |   6 +
 drivers/usb/musb/musbhsdma.c |  55 ++--
 9 files changed, 762 insertions(+), 38 deletions(-)
 create mode 100644 drivers/usb/musb/mediatek.c

diff --git a/drivers/usb/musb/Kconfig b/drivers/usb/musb/Kconfig
index ad08895..b72b7c1 100644
--- a/drivers/usb/musb/Kconfig
+++ b/drivers/usb/musb/Kconfig
@@ -115,6 +115,12 @@ config USB_MUSB_JZ4740
 	depends on USB_MUSB_GADGET
 	depends on USB_OTG_BLACKLIST_HUB
 
+config USB_MUSB_MEDIATEK
+	tristate "MediaTek platforms"
+	depends on ARCH_MEDIATEK || COMPILE_TEST
+	depends on NOP_USB_XCEIV
+	depends on GENERIC_PHY
+
 config USB_MUSB_AM335X_CHILD
 	tristate
 
@@ -141,7 +147,7 @@ config USB_UX500_DMA
 
 config USB_INVENTRA_DMA
 	bool 'Inventra'
-	depends on USB_MUSB_OMAP2PLUS
+	depends on USB_MUSB_OMAP2PLUS || USB_MUSB_MEDIATEK
 	help
 	  Enable DMA transfers using Mentor's engine.
 
diff --git a/drivers/usb/musb/Makefile b/drivers/usb/musb/Makefile
index 3a88c79..63d82d0 100644
--- a/drivers/usb/musb/Makefile
+++ b/drivers/usb/musb/Makefile
@@ -24,6 +24,7 @@ obj-$(CONFIG_USB_MUSB_DA8XX)			+= da8xx.o
 obj-$(CONFIG_USB_MUSB_UX500)			+= ux500.o
 obj-$(CONFIG_USB_MUSB_JZ4740)			+= jz4740.o
 obj-$(CONFIG_USB_MUSB_SUNXI)			+= sunxi.o
+obj-$(CONFIG_USB_MUSB_MEDIATEK)      		+= mediatek.o
 
 
 obj-$(CONFIG_USB_MUSB_AM335X_CHILD)		+= musb_am335x.o
diff --git a/drivers/usb/musb/mediatek.c b/drivers/usb/musb/mediatek.c
new file mode 100644
index 0000000..7221989
--- /dev/null
+++ b/drivers/usb/musb/mediatek.c
@@ -0,0 +1,617 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2018 MediaTek Inc.
+ *
+ * Author:
+ *  Min Guo <min.guo@mediatek.com>
+ *  Yonglong Wu <yonglong.wu@mediatek.com>
+ */
+
+#include <linux/clk.h>
+#include <linux/dma-mapping.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/usb/usb_phy_generic.h>
+#include "musb_core.h"
+#include "musb_dma.h"
+
+#define USB_L1INTS	0x00a0
+#define USB_L1INTM	0x00a4
+#define MTK_MUSB_TXFUNCADDR	0x0480
+
+/* MediaTek controller toggle enable and status reg */
+#define MUSB_RXTOG		0x80
+#define MUSB_RXTOGEN		0x82
+#define MUSB_TXTOG		0x84
+#define MUSB_TXTOGEN		0x86
+
+#define TX_INT_STATUS		BIT(0)
+#define RX_INT_STATUS		BIT(1)
+#define USBCOM_INT_STATUS	BIT(2)
+#define DMA_INT_STATUS		BIT(3)
+
+#define DMA_INTR_STATUS_MSK		GENMASK(7, 0)
+#define DMA_INTR_UNMASK_SET_MSK	GENMASK(31, 24)
+
+enum mtk_vbus_id_state {
+	MTK_ID_FLOAT = 1,
+	MTK_ID_GROUND,
+	MTK_VBUS_OFF,
+	MTK_VBUS_VALID,
+};
+
+struct mtk_glue {
+	struct device *dev;
+	struct musb *musb;
+	struct platform_device *musb_pdev;
+	struct platform_device *usb_phy;
+	struct phy *phy;
+	struct usb_phy *xceiv;
+	enum phy_mode phy_mode;
+	struct clk *main;
+	struct clk *mcu;
+	struct clk *univpll;
+	struct regulator *vbus;
+	struct extcon_dev *edev;
+	struct notifier_block vbus_nb;
+	struct notifier_block id_nb;
+};
+
+static int mtk_musb_clks_get(struct mtk_glue *glue)
+{
+	struct device *dev = glue->dev;
+
+	glue->main = devm_clk_get(dev, "main");
+	if (IS_ERR(glue->main)) {
+		dev_err(dev, "fail to get main clock\n");
+		return PTR_ERR(glue->main);
+	}
+
+	glue->mcu = devm_clk_get(dev, "mcu");
+	if (IS_ERR(glue->mcu)) {
+		dev_err(dev, "fail to get mcu clock\n");
+		return PTR_ERR(glue->mcu);
+	}
+
+	glue->univpll = devm_clk_get(dev, "univpll");
+	if (IS_ERR(glue->univpll)) {
+		dev_err(dev, "fail to get univpll clock\n");
+		return PTR_ERR(glue->univpll);
+	}
+
+	return 0;
+}
+
+static int mtk_musb_clks_enable(struct mtk_glue *glue)
+{
+	int ret;
+
+	ret = clk_prepare_enable(glue->main);
+	if (ret) {
+		dev_err(glue->dev, "failed to enable main clock\n");
+		goto err_main_clk;
+	}
+
+	ret = clk_prepare_enable(glue->mcu);
+	if (ret) {
+		dev_err(glue->dev, "failed to enable mcu clock\n");
+		goto err_mcu_clk;
+	}
+
+	ret = clk_prepare_enable(glue->univpll);
+	if (ret) {
+		dev_err(glue->dev, "failed to enable univpll clock\n");
+		goto err_univpll_clk;
+	}
+
+	return 0;
+
+err_univpll_clk:
+	clk_disable_unprepare(glue->mcu);
+err_mcu_clk:
+	clk_disable_unprepare(glue->main);
+err_main_clk:
+	return ret;
+}
+
+static void mtk_musb_clks_disable(struct mtk_glue *glue)
+{
+	clk_disable_unprepare(glue->univpll);
+	clk_disable_unprepare(glue->mcu);
+	clk_disable_unprepare(glue->main);
+}
+
+static void mtk_musb_set_vbus(struct musb *musb, int is_on)
+{
+	struct device *dev = musb->controller;
+	struct mtk_glue *glue = dev_get_drvdata(dev->parent);
+	int ret;
+
+	/* vbus is optional */
+	if (!glue->vbus)
+		return;
+
+	dev_dbg(musb->controller, "%s, is_on=%d\r\n", __func__, is_on);
+	if (is_on) {
+		ret = regulator_enable(glue->vbus);
+		if (ret) {
+			dev_err(glue->dev, "fail to enable vbus regulator\n");
+			return;
+		}
+	} else {
+		regulator_disable(glue->vbus);
+	}
+}
+
+/*
+ * switch to host: -> MTK_VBUS_OFF --> MTK_ID_GROUND
+ * switch to device: -> MTK_ID_FLOAT --> MTK_VBUS_VALID
+ */
+static void mtk_musb_set_mailbox(struct mtk_glue *glue,
+	enum mtk_vbus_id_state status)
+{
+	struct musb *musb = glue->musb;
+	u8 devctl = 0;
+
+	dev_dbg(glue->dev, "mailbox state(%d)\n", status);
+	switch (status) {
+	case MTK_ID_GROUND:
+		phy_power_on(glue->phy);
+		devctl = readb(musb->mregs + MUSB_DEVCTL);
+		musb->xceiv->otg->state = OTG_STATE_A_WAIT_VRISE;
+		mtk_musb_set_vbus(musb, 1);
+		glue->phy_mode = PHY_MODE_USB_HOST;
+		phy_set_mode(glue->phy, glue->phy_mode);
+		devctl |= MUSB_DEVCTL_SESSION;
+		musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
+		MUSB_HST_MODE(musb);
+		break;
+	/*
+	 * MTK_ID_FLOAT process is the same as MTK_VBUS_VALID
+	 * except that turn off VBUS
+	 */
+	case MTK_ID_FLOAT:
+		mtk_musb_set_vbus(musb, 0);
+		/* fall through */
+	case MTK_VBUS_OFF:
+		musb->xceiv->otg->state = OTG_STATE_B_IDLE;
+		devctl &= ~MUSB_DEVCTL_SESSION;
+		musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
+		phy_power_off(glue->phy);
+		break;
+	case MTK_VBUS_VALID:
+		phy_power_on(glue->phy);
+		glue->phy_mode = PHY_MODE_USB_DEVICE;
+		phy_set_mode(glue->phy, glue->phy_mode);
+		MUSB_DEV_MODE(musb);
+		break;
+	default:
+		dev_err(glue->dev, "invalid state\n");
+	}
+}
+
+static int mtk_musb_id_notifier(struct notifier_block *nb,
+	unsigned long event, void *ptr)
+{
+	struct mtk_glue *glue = container_of(nb, struct mtk_glue, id_nb);
+
+	if (event)
+		mtk_musb_set_mailbox(glue, MTK_ID_GROUND);
+	else
+		mtk_musb_set_mailbox(glue, MTK_ID_FLOAT);
+
+	return NOTIFY_DONE;
+}
+
+static int mtk_musb_vbus_notifier(struct notifier_block *nb,
+	unsigned long event, void *ptr)
+{
+	struct mtk_glue *glue = container_of(nb, struct mtk_glue, vbus_nb);
+
+	if (event)
+		mtk_musb_set_mailbox(glue, MTK_VBUS_VALID);
+	else
+		mtk_musb_set_mailbox(glue, MTK_VBUS_OFF);
+
+	return NOTIFY_DONE;
+}
+
+static void mtk_otg_switch_init(struct mtk_glue *glue)
+{
+	int ret;
+
+	/* extcon is optional */
+	if (!glue->edev)
+		return;
+
+	glue->vbus_nb.notifier_call = mtk_musb_vbus_notifier;
+	ret = devm_extcon_register_notifier(glue->dev, glue->edev, EXTCON_USB,
+					&glue->vbus_nb);
+	if (ret < 0)
+		dev_err(glue->dev, "failed to register notifier for USB\n");
+
+	glue->id_nb.notifier_call = mtk_musb_id_notifier;
+	ret = devm_extcon_register_notifier(glue->dev, glue->edev,
+					EXTCON_USB_HOST, &glue->id_nb);
+	if (ret < 0)
+		dev_err(glue->dev, "failed to register notifier for USB-HOST\n");
+
+	dev_dbg(glue->dev, "EXTCON_USB: %d, EXTCON_USB_HOST: %d\n",
+		extcon_get_state(glue->edev, EXTCON_USB),
+		extcon_get_state(glue->edev, EXTCON_USB_HOST));
+
+	/* default as host, switch to device mode if needed */
+	if (extcon_get_state(glue->edev, EXTCON_USB_HOST) == false)
+		mtk_musb_set_mailbox(glue, MTK_ID_FLOAT);
+	if (extcon_get_state(glue->edev, EXTCON_USB) == true)
+		mtk_musb_set_mailbox(glue, MTK_VBUS_VALID);
+}
+
+static irqreturn_t generic_interrupt(int irq, void *__hci)
+{
+	unsigned long flags;
+	irqreturn_t retval = IRQ_NONE;
+	struct musb *musb = __hci;
+
+	spin_lock_irqsave(&musb->lock, flags);
+	musb->int_usb = musb_readb(musb->mregs, MUSB_INTRUSB) &
+	    musb_readb(musb->mregs, MUSB_INTRUSBE);
+	musb->int_tx = musb_readw(musb->mregs, MUSB_INTRTX)
+	    & musb_readw(musb->mregs, MUSB_INTRTXE);
+	musb->int_rx = musb_readw(musb->mregs, MUSB_INTRRX)
+	    & musb_readw(musb->mregs, MUSB_INTRRXE);
+	/* MediaTek controller interrupt status is W1C */
+	musb_clearw(musb->mregs, MUSB_INTRRX, musb->int_rx);
+	musb_clearw(musb->mregs, MUSB_INTRTX, musb->int_tx);
+	musb_clearb(musb->mregs, MUSB_INTRUSB, musb->int_usb);
+
+	if (musb->int_usb || musb->int_tx || musb->int_rx)
+		retval = musb_interrupt(musb);
+
+	spin_unlock_irqrestore(&musb->lock, flags);
+
+	return retval;
+}
+
+static irqreturn_t mtk_musb_interrupt(int irq, void *dev_id)
+{
+	irqreturn_t retval = IRQ_NONE;
+	struct musb *musb = (struct musb *)dev_id;
+	u32 l1_ints;
+
+	l1_ints = musb_readl(musb->mregs, USB_L1INTS) &
+			musb_readl(musb->mregs, USB_L1INTM);
+
+	if (l1_ints & (TX_INT_STATUS | RX_INT_STATUS | USBCOM_INT_STATUS))
+		retval = generic_interrupt(irq, musb);
+
+#if defined(CONFIG_USB_INVENTRA_DMA)
+	if (l1_ints & DMA_INT_STATUS)
+		retval = dma_controller_irq(irq, musb->dma_controller);
+#endif
+	return retval;
+}
+
+static u32 mtk_musb_busctl_offset(u8 epnum, u16 offset)
+{
+	return MTK_MUSB_TXFUNCADDR + offset + 8 * epnum;
+}
+
+static void mtk_musb_clearb(void __iomem *addr, unsigned int offset, u8 data)
+{
+	/* W1C */
+	musb_writeb(addr, offset, data);
+}
+
+static void mtk_musb_clearw(void __iomem *addr, unsigned int offset, u16 data)
+{
+	/* W1C */
+	musb_writew(addr, offset, data);
+}
+
+static int mtk_musb_init(struct musb *musb)
+{
+	struct device *dev = musb->controller;
+	struct mtk_glue *glue = dev_get_drvdata(dev->parent);
+	int ret;
+
+	glue->musb = musb;
+	musb->phy = glue->phy;
+	musb->xceiv = glue->xceiv;
+	musb->is_host = false;
+	musb->isr = mtk_musb_interrupt;
+	ret = phy_init(glue->phy);
+	if (ret)
+		return ret;
+
+	ret = phy_power_on(glue->phy);
+	if (ret) {
+		phy_exit(glue->phy);
+		return ret;
+	}
+
+	phy_set_mode(glue->phy, glue->phy_mode);
+
+#if defined(CONFIG_USB_INVENTRA_DMA)
+	musb_writel(musb->mregs, MUSB_HSDMA_INTR,
+		    DMA_INTR_STATUS_MSK | DMA_INTR_UNMASK_SET_MSK);
+#endif
+	musb_writel(musb->mregs, USB_L1INTM, TX_INT_STATUS | RX_INT_STATUS |
+		    USBCOM_INT_STATUS | DMA_INT_STATUS);
+	return 0;
+}
+
+static u16 mtk_musb_get_toggle(struct musb_qh *qh, int is_in)
+{
+	struct musb *musb = qh->hw_ep->musb;
+	u8 epnum = qh->hw_ep->epnum;
+	u16 toggle;
+
+	if (is_in)
+		toggle = musb_readw(musb->mregs, MUSB_RXTOG);
+	else
+		toggle = musb_readw(musb->mregs, MUSB_TXTOG);
+
+	return toggle & (1 << epnum);
+}
+
+static u16 mtk_musb_set_toggle(struct musb_qh *qh, int is_in, struct urb *urb)
+{
+	struct musb *musb = qh->hw_ep->musb;
+	u8 epnum = qh->hw_ep->epnum;
+	u16 toggle = 0;
+
+	toggle = usb_gettoggle(urb->dev, qh->epnum, !is_in);
+
+	if (is_in) {
+		musb_writew(musb->mregs, MUSB_RXTOGEN, (1 << epnum));
+		musb_writew(musb->mregs, MUSB_RXTOG, (toggle << epnum));
+	} else {
+		musb_writew(musb->mregs, MUSB_TXTOGEN, (1 << epnum));
+		musb_writew(musb->mregs, MUSB_TXTOG, (toggle << epnum));
+	}
+
+	return 0;
+}
+
+static int mtk_musb_set_mode(struct musb *musb, u8 mode)
+{
+	struct device *dev = musb->controller;
+	struct mtk_glue *glue = dev_get_drvdata(dev->parent);
+	enum phy_mode new_mode;
+
+	switch (mode) {
+	case MUSB_HOST:
+		new_mode = PHY_MODE_USB_HOST;
+		mtk_musb_set_vbus(musb, 1);
+		break;
+	case MUSB_PERIPHERAL:
+		new_mode = PHY_MODE_USB_DEVICE;
+		break;
+	case MUSB_OTG:
+		new_mode = PHY_MODE_USB_HOST;
+		break;
+	default:
+		dev_err(musb->controller->parent,
+			"Error requested mode not supported by this kernel\n");
+		return -EINVAL;
+	}
+	if (glue->phy_mode == new_mode)
+		return 0;
+
+	mtk_musb_set_mailbox(glue, MTK_ID_GROUND);
+	return 0;
+}
+
+static int mtk_musb_exit(struct musb *musb)
+{
+	struct device *dev = musb->controller;
+	struct mtk_glue *glue = dev_get_drvdata(dev->parent);
+
+	phy_power_off(glue->phy);
+	phy_exit(glue->phy);
+	mtk_musb_clks_disable(glue);
+
+	pm_runtime_put_sync(dev);
+	pm_runtime_disable(dev);
+	return 0;
+}
+
+static const struct musb_platform_ops mtk_musb_ops = {
+	.quirks = MUSB_DMA_INVENTRA,
+	.init = mtk_musb_init,
+	.get_toggle = mtk_musb_get_toggle,
+	.set_toggle = mtk_musb_set_toggle,
+	.exit = mtk_musb_exit,
+#ifdef CONFIG_USB_INVENTRA_DMA
+	.dma_init = musbhs_dma_controller_create_noirq,
+	.dma_exit = musbhs_dma_controller_destroy,
+#endif
+	.clearb = mtk_musb_clearb,
+	.clearw = mtk_musb_clearw,
+	.busctl_offset = mtk_musb_busctl_offset,
+	.set_mode = mtk_musb_set_mode,
+	.set_vbus = mtk_musb_set_vbus,
+};
+
+#define MTK_MUSB_MAX_EP_NUM	8
+#define MTK_MUSB_RAM_BITS	11
+
+static struct musb_fifo_cfg mtk_musb_mode_cfg[] = {
+	{ .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, },
+	{ .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, },
+	{ .hw_ep_num = 2, .style = FIFO_TX, .maxpacket = 512, },
+	{ .hw_ep_num = 2, .style = FIFO_RX, .maxpacket = 512, },
+	{ .hw_ep_num = 3, .style = FIFO_TX, .maxpacket = 512, },
+	{ .hw_ep_num = 3, .style = FIFO_RX, .maxpacket = 512, },
+	{ .hw_ep_num = 4, .style = FIFO_TX, .maxpacket = 512, },
+	{ .hw_ep_num = 4, .style = FIFO_RX, .maxpacket = 512, },
+	{ .hw_ep_num = 5, .style = FIFO_TX, .maxpacket = 512, },
+	{ .hw_ep_num = 5, .style = FIFO_RX, .maxpacket = 512, },
+	{ .hw_ep_num = 6, .style = FIFO_TX, .maxpacket = 1024, },
+	{ .hw_ep_num = 6, .style = FIFO_RX, .maxpacket = 1024, },
+	{ .hw_ep_num = 7, .style = FIFO_TX, .maxpacket = 512, },
+	{ .hw_ep_num = 7, .style = FIFO_RX, .maxpacket = 64, },
+};
+
+static const struct musb_hdrc_config mtk_musb_hdrc_config = {
+	.fifo_cfg = mtk_musb_mode_cfg,
+	.fifo_cfg_size = ARRAY_SIZE(mtk_musb_mode_cfg),
+	.multipoint = true,
+	.dyn_fifo = true,
+	.num_eps = MTK_MUSB_MAX_EP_NUM,
+	.ram_bits = MTK_MUSB_RAM_BITS,
+};
+
+static const struct platform_device_info mtk_dev_info = {
+	.name = "musb-hdrc",
+	.id = PLATFORM_DEVID_AUTO,
+	.dma_mask = DMA_BIT_MASK(32),
+};
+
+static int mtk_musb_probe(struct platform_device *pdev)
+{
+	struct musb_hdrc_platform_data *pdata;
+	struct mtk_glue *glue;
+	struct platform_device_info pinfo;
+	struct device *dev = &pdev->dev;
+	struct device_node *np = dev->of_node;
+	int ret = -ENOMEM;
+
+	glue = devm_kzalloc(dev, sizeof(*glue), GFP_KERNEL);
+	if (!glue)
+		return -ENOMEM;
+
+	glue->dev = dev;
+	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+	if (!pdata)
+		return -ENOMEM;
+
+	ret = mtk_musb_clks_get(glue);
+	if (ret)
+		return ret;
+
+	glue->vbus = devm_regulator_get(dev, "vbus");
+	if (IS_ERR(glue->vbus)) {
+		dev_err(dev, "fail to get vbus\n");
+		return PTR_ERR(glue->vbus);
+	}
+
+	pdata->config = &mtk_musb_hdrc_config;
+	pdata->platform_ops = &mtk_musb_ops;
+	if (of_property_read_bool(np, "extcon")) {
+		glue->edev = extcon_get_edev_by_phandle(dev, 0);
+		if (IS_ERR(glue->edev)) {
+			dev_err(dev, "fail to get extcon\n");
+			return PTR_ERR(glue->edev);
+		}
+	}
+
+	pdata->mode = usb_get_dr_mode(dev);
+	switch (pdata->mode) {
+	case USB_DR_MODE_HOST:
+		glue->phy_mode = PHY_MODE_USB_HOST;
+		break;
+	case USB_DR_MODE_PERIPHERAL:
+		glue->phy_mode = PHY_MODE_USB_DEVICE;
+		break;
+	default:
+		pdata->mode = USB_DR_MODE_OTG;
+		/* FALL THROUGH */
+	case USB_DR_MODE_OTG:
+		glue->phy_mode = PHY_MODE_USB_OTG;
+		break;
+	}
+
+	glue->phy = devm_of_phy_get_by_index(dev, np, 0);
+	if (IS_ERR(glue->phy)) {
+		dev_err(dev, "fail to getting phy %ld\n",
+			PTR_ERR(glue->phy));
+		return PTR_ERR(glue->phy);
+	}
+
+	glue->usb_phy = usb_phy_generic_register();
+	if (IS_ERR(glue->usb_phy)) {
+		dev_err(dev, "fail to registering usb-phy %ld\n",
+			PTR_ERR(glue->usb_phy));
+		return PTR_ERR(glue->usb_phy);
+	}
+
+	glue->xceiv = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2);
+	if (IS_ERR(glue->xceiv)) {
+		dev_err(dev, "fail to getting usb-phy %d\n", ret);
+		ret = PTR_ERR(glue->xceiv);
+		goto err_unregister_usb_phy;
+	}
+
+	platform_set_drvdata(pdev, glue);
+	pm_runtime_enable(dev);
+	pm_runtime_get_sync(dev);
+
+	ret = mtk_musb_clks_enable(glue);
+	if (ret)
+		goto err_enable_clk;
+
+	pinfo = mtk_dev_info;
+	pinfo.parent = dev;
+	pinfo.res = pdev->resource;
+	pinfo.num_res = pdev->num_resources;
+	pinfo.data = pdata;
+	pinfo.size_data = sizeof(*pdata);
+
+	glue->musb_pdev = platform_device_register_full(&pinfo);
+	if (IS_ERR(glue->musb_pdev)) {
+		ret = PTR_ERR(glue->musb_pdev);
+		dev_err(dev, "failed to register musb device: %d\n", ret);
+		goto err_device_register;
+	}
+
+	if (pdata->mode == USB_DR_MODE_OTG)
+		mtk_otg_switch_init(glue);
+
+	dev_info(dev, "USB probe done!\n");
+	return 0;
+
+err_device_register:
+	mtk_musb_clks_disable(glue);
+err_enable_clk:
+	pm_runtime_put_sync(dev);
+	pm_runtime_disable(dev);
+err_unregister_usb_phy:
+	usb_phy_generic_unregister(glue->usb_phy);
+	return ret;
+}
+
+static int mtk_musb_remove(struct platform_device *pdev)
+{
+	struct mtk_glue *glue = platform_get_drvdata(pdev);
+	struct platform_device *usb_phy = glue->usb_phy;
+
+	platform_device_unregister(glue->musb_pdev);
+	usb_phy_generic_unregister(usb_phy);
+
+	return 0;
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id mtk_musb_match[] = {
+	{.compatible = "mediatek,mtk-musb",},
+	{},
+};
+MODULE_DEVICE_TABLE(of, mtk_musb_match);
+#endif
+
+static struct platform_driver mtk_musb_driver = {
+	.probe = mtk_musb_probe,
+	.remove = mtk_musb_remove,
+	.driver = {
+		   .name = "musb-mtk",
+		   .of_match_table = of_match_ptr(mtk_musb_match),
+	},
+};
+
+module_platform_driver(mtk_musb_driver);
+
+MODULE_DESCRIPTION("MediaTek MUSB Glue Layer");
+MODULE_AUTHOR("Min Guo <min.guo@mediatek.com>");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c
index b7d5627..2c0d102 100644
--- a/drivers/usb/musb/musb_core.c
+++ b/drivers/usb/musb/musb_core.c
@@ -260,6 +260,11 @@ static void musb_default_writeb(void __iomem *addr, unsigned offset, u8 data)
 	__raw_writeb(data, addr + offset);
 }
 
+static void
+musb_default_clearb(void __iomem *addr, unsigned int offset, u8 data)
+{
+}
+
 static u16 musb_default_readw(const void __iomem *addr, unsigned offset)
 {
 	u16 data = __raw_readw(addr + offset);
@@ -274,6 +279,43 @@ static void musb_default_writew(void __iomem *addr, unsigned offset, u16 data)
 	__raw_writew(data, addr + offset);
 }
 
+static void
+musb_default_clearw(void __iomem *addr, unsigned int offset, u16 data)
+{
+}
+
+static u16 musb_default_get_toggle(struct musb_qh *qh, int is_in)
+{
+	void __iomem *epio = qh->hw_ep->regs;
+	u16 csr;
+
+	if (is_in)
+		csr = musb_readw(epio, MUSB_RXCSR) & MUSB_RXCSR_H_DATATOGGLE;
+	else
+		csr = musb_readw(epio, MUSB_TXCSR) & MUSB_TXCSR_H_DATATOGGLE;
+
+	return csr;
+}
+
+static u16 musb_default_set_toggle(struct musb_qh *qh, int is_in,
+	struct urb *urb)
+{
+	u16 csr = 0;
+	u16 toggle = 0;
+
+	toggle = usb_gettoggle(urb->dev, qh->epnum, !is_in);
+
+	if (is_in)
+		csr = toggle ? (MUSB_RXCSR_H_WR_DATATOGGLE
+				| MUSB_RXCSR_H_DATATOGGLE) : 0;
+	else
+		csr |= toggle ? (MUSB_TXCSR_H_WR_DATATOGGLE
+				| MUSB_TXCSR_H_DATATOGGLE)
+				: MUSB_TXCSR_CLRDATATOG;
+
+	return csr;
+}
+
 /*
  * Load an endpoint's FIFO
  */
@@ -370,12 +412,18 @@ static void musb_default_read_fifo(struct musb_hw_ep *hw_ep, u16 len, u8 *dst)
 void (*musb_writeb)(void __iomem *addr, unsigned offset, u8 data);
 EXPORT_SYMBOL_GPL(musb_writeb);
 
+void (*musb_clearb)(void __iomem *addr, unsigned int offset, u8 data);
+EXPORT_SYMBOL_GPL(musb_clearb);
+
 u16 (*musb_readw)(const void __iomem *addr, unsigned offset);
 EXPORT_SYMBOL_GPL(musb_readw);
 
 void (*musb_writew)(void __iomem *addr, unsigned offset, u16 data);
 EXPORT_SYMBOL_GPL(musb_writew);
 
+void (*musb_clearw)(void __iomem *addr, unsigned int offset, u16 data);
+EXPORT_SYMBOL_GPL(musb_clearw);
+
 u32 musb_readl(const void __iomem *addr, unsigned offset)
 {
 	u32 data = __raw_readl(addr + offset);
@@ -1028,6 +1076,11 @@ static void musb_disable_interrupts(struct musb *musb)
 	temp = musb_readb(mbase, MUSB_INTRUSB);
 	temp = musb_readw(mbase, MUSB_INTRTX);
 	temp = musb_readw(mbase, MUSB_INTRRX);
+
+	/* some platform needs clear pending interrupts by manual */
+	musb_clearb(mbase, MUSB_INTRUSB, musb_readb(mbase, MUSB_INTRUSB));
+	musb_clearw(mbase, MUSB_INTRRX, musb_readw(mbase, MUSB_INTRRX));
+	musb_clearw(mbase, MUSB_INTRTX, musb_readw(mbase, MUSB_INTRTX));
 }
 
 static void musb_enable_interrupts(struct musb *musb)
@@ -2192,6 +2245,8 @@ static void musb_deassert_reset(struct work_struct *work)
 	musb_writeb = musb_default_writeb;
 	musb_readw = musb_default_readw;
 	musb_writew = musb_default_writew;
+	musb_clearb = musb_default_clearb;
+	musb_clearw = musb_default_clearw;
 
 	/* The musb_platform_init() call:
 	 *   - adjusts musb->mregs
@@ -2252,10 +2307,14 @@ static void musb_deassert_reset(struct work_struct *work)
 		musb_readb = musb->ops->readb;
 	if (musb->ops->writeb)
 		musb_writeb = musb->ops->writeb;
+	if (musb->ops->clearb)
+		musb_clearb = musb->ops->clearb;
 	if (musb->ops->readw)
 		musb_readw = musb->ops->readw;
 	if (musb->ops->writew)
 		musb_writew = musb->ops->writew;
+	if (musb->ops->clearw)
+		musb_clearw = musb->ops->clearw;
 
 #ifndef CONFIG_MUSB_PIO_ONLY
 	if (!musb->ops->dma_init || !musb->ops->dma_exit) {
@@ -2277,6 +2336,16 @@ static void musb_deassert_reset(struct work_struct *work)
 	else
 		musb->io.write_fifo = musb_default_write_fifo;
 
+	if (musb->ops->get_toggle)
+		musb->io.get_toggle = musb->ops->get_toggle;
+	else
+		musb->io.get_toggle = musb_default_get_toggle;
+
+	if (musb->ops->set_toggle)
+		musb->io.set_toggle = musb->ops->set_toggle;
+	else
+		musb->io.set_toggle = musb_default_set_toggle;
+
 	if (!musb->xceiv->io_ops) {
 		musb->xceiv->io_dev = musb->controller;
 		musb->xceiv->io_priv = musb->mregs;
diff --git a/drivers/usb/musb/musb_core.h b/drivers/usb/musb/musb_core.h
index 04203b7..71dca80 100644
--- a/drivers/usb/musb/musb_core.h
+++ b/drivers/usb/musb/musb_core.h
@@ -27,6 +27,7 @@
 struct musb;
 struct musb_hw_ep;
 struct musb_ep;
+struct musb_qh;
 
 /* Helper defines for struct musb->hwvers */
 #define MUSB_HWVERS_MAJOR(x)	((x >> 10) & 0x1f)
@@ -119,10 +120,14 @@ enum musb_g_ep0_state {
  * @fifo_offset: returns the fifo offset
  * @readb:	read 8 bits
  * @writeb:	write 8 bits
+ * @clearb:	clear 8 bits
  * @readw:	read 16 bits
  * @writew:	write 16 bits
+ * @clearw:	clear 16 bits
  * @read_fifo:	reads the fifo
  * @write_fifo:	writes to fifo
+ * @get_toggle:	platform specific get toggle function
+ * @set_toggle:	platform specific set toggle function
  * @dma_init:	platform specific dma init function
  * @dma_exit:	platform specific dma exit function
  * @init:	turns on clocks, sets up platform-specific registers, etc
@@ -163,10 +168,14 @@ struct musb_platform_ops {
 	u32	(*busctl_offset)(u8 epnum, u16 offset);
 	u8	(*readb)(const void __iomem *addr, unsigned offset);
 	void	(*writeb)(void __iomem *addr, unsigned offset, u8 data);
+	void	(*clearb)(void __iomem *addr, unsigned int offset, u8 data);
 	u16	(*readw)(const void __iomem *addr, unsigned offset);
 	void	(*writew)(void __iomem *addr, unsigned offset, u16 data);
+	void	(*clearw)(void __iomem *addr, unsigned int offset, u16 data);
 	void	(*read_fifo)(struct musb_hw_ep *hw_ep, u16 len, u8 *buf);
 	void	(*write_fifo)(struct musb_hw_ep *hw_ep, u16 len, const u8 *buf);
+	u16	(*get_toggle)(struct musb_qh *qh, int is_in);
+	u16	(*set_toggle)(struct musb_qh *qh, int is_in, struct urb *urb);
 	struct dma_controller *
 		(*dma_init) (struct musb *musb, void __iomem *base);
 	void	(*dma_exit)(struct dma_controller *c);
diff --git a/drivers/usb/musb/musb_dma.h b/drivers/usb/musb/musb_dma.h
index 8f60271..05103ea 100644
--- a/drivers/usb/musb/musb_dma.h
+++ b/drivers/usb/musb/musb_dma.h
@@ -35,6 +35,12 @@
  *    whether shared with the Inventra core or separate.
  */
 
+#define MUSB_HSDMA_BASE		0x200
+#define MUSB_HSDMA_INTR		(MUSB_HSDMA_BASE + 0)
+#define MUSB_HSDMA_CONTROL		0x4
+#define MUSB_HSDMA_ADDRESS		0x8
+#define MUSB_HSDMA_COUNT		0xc
+
 #define	DMA_ADDR_INVALID	(~(dma_addr_t)0)
 
 #ifdef CONFIG_MUSB_PIO_ONLY
@@ -191,6 +197,9 @@ static inline void musb_dma_controller_destroy(struct dma_controller *d) { }
 extern struct dma_controller *
 musbhs_dma_controller_create(struct musb *musb, void __iomem *base);
 extern void musbhs_dma_controller_destroy(struct dma_controller *c);
+extern struct dma_controller *
+musbhs_dma_controller_create_noirq(struct musb *musb, void __iomem *base);
+extern irqreturn_t dma_controller_irq(int irq, void *private_data);
 
 extern struct dma_controller *
 tusb_dma_controller_create(struct musb *musb, void __iomem *base);
diff --git a/drivers/usb/musb/musb_host.c b/drivers/usb/musb/musb_host.c
index 16d0ba4..ba66f44 100644
--- a/drivers/usb/musb/musb_host.c
+++ b/drivers/usb/musb/musb_host.c
@@ -290,39 +290,23 @@ static void musb_giveback(struct musb *musb, struct urb *urb, int status)
 static inline void musb_save_toggle(struct musb_qh *qh, int is_in,
 				    struct urb *urb)
 {
-	void __iomem		*epio = qh->hw_ep->regs;
-	u16			csr;
+	struct musb *musb = qh->hw_ep->musb;
+	u16 csr;
 
 	/*
 	 * FIXME: the current Mentor DMA code seems to have
 	 * problems getting toggle correct.
 	 */
-
-	if (is_in)
-		csr = musb_readw(epio, MUSB_RXCSR) & MUSB_RXCSR_H_DATATOGGLE;
-	else
-		csr = musb_readw(epio, MUSB_TXCSR) & MUSB_TXCSR_H_DATATOGGLE;
-
+	csr = musb->io.get_toggle(qh, is_in);
 	usb_settoggle(urb->dev, qh->epnum, !is_in, csr ? 1 : 0);
 }
 
 static inline u16 musb_set_toggle(struct musb_qh *qh, int is_in,
 	struct urb *urb)
 {
-	u16 csr = 0;
-	u16 toggle = 0;
-
-	toggle = usb_gettoggle(urb->dev, qh->epnum, !is_in);
-
-	if (is_in)
-		csr = toggle ? (MUSB_RXCSR_H_WR_DATATOGGLE
-				| MUSB_RXCSR_H_DATATOGGLE) : 0;
-	else
-		csr = toggle ? (MUSB_TXCSR_H_WR_DATATOGGLE
-				| MUSB_TXCSR_H_DATATOGGLE)
-				: MUSB_TXCSR_CLRDATATOG;
+	struct musb *musb = qh->hw_ep->musb;
 
-	return csr;
+	return musb->io.set_toggle(qh, is_in, urb);
 }
 
 /*
diff --git a/drivers/usb/musb/musb_io.h b/drivers/usb/musb/musb_io.h
index 8058a58..9bae09b 100644
--- a/drivers/usb/musb/musb_io.h
+++ b/drivers/usb/musb/musb_io.h
@@ -22,6 +22,8 @@
  * @read_fifo:	platform specific function to read fifo
  * @write_fifo:	platform specific function to write fifo
  * @busctl_offset: platform specific function to get busctl offset
+ * @get_toggle: platform specific function to get toggle
+ * @set_toggle: platform specific function to set toggle
  */
 struct musb_io {
 	u32	(*ep_offset)(u8 epnum, u16 offset);
@@ -30,13 +32,17 @@ struct musb_io {
 	void	(*read_fifo)(struct musb_hw_ep *hw_ep, u16 len, u8 *buf);
 	void	(*write_fifo)(struct musb_hw_ep *hw_ep, u16 len, const u8 *buf);
 	u32	(*busctl_offset)(u8 epnum, u16 offset);
+	u16	(*get_toggle)(struct musb_qh *qh, int is_in);
+	u16	(*set_toggle)(struct musb_qh *qh, int is_in, struct urb *urb);
 };
 
 /* Do not add new entries here, add them the struct musb_io instead */
 extern u8 (*musb_readb)(const void __iomem *addr, unsigned offset);
 extern void (*musb_writeb)(void __iomem *addr, unsigned offset, u8 data);
+extern void (*musb_clearb)(void __iomem *addr, unsigned int offset, u8 data);
 extern u16 (*musb_readw)(const void __iomem *addr, unsigned offset);
 extern void (*musb_writew)(void __iomem *addr, unsigned offset, u16 data);
+extern void (*musb_clearw)(void __iomem *addr, unsigned int offset, u16 data);
 extern u32 musb_readl(const void __iomem *addr, unsigned offset);
 extern void musb_writel(void __iomem *addr, unsigned offset, u32 data);
 
diff --git a/drivers/usb/musb/musbhsdma.c b/drivers/usb/musb/musbhsdma.c
index a688f7f..b05fe68 100644
--- a/drivers/usb/musb/musbhsdma.c
+++ b/drivers/usb/musb/musbhsdma.c
@@ -10,12 +10,7 @@
 #include <linux/platform_device.h>
 #include <linux/slab.h>
 #include "musb_core.h"
-
-#define MUSB_HSDMA_BASE		0x200
-#define MUSB_HSDMA_INTR		(MUSB_HSDMA_BASE + 0)
-#define MUSB_HSDMA_CONTROL		0x4
-#define MUSB_HSDMA_ADDRESS		0x8
-#define MUSB_HSDMA_COUNT		0xc
+#include "musb_dma.h"
 
 #define MUSB_HSDMA_CHANNEL_OFFSET(_bchannel, _offset)		\
 		(MUSB_HSDMA_BASE + (_bchannel << 4) + _offset)
@@ -268,7 +263,7 @@ static int dma_channel_abort(struct dma_channel *channel)
 	return 0;
 }
 
-static irqreturn_t dma_controller_irq(int irq, void *private_data)
+irqreturn_t dma_controller_irq(int irq, void *private_data)
 {
 	struct musb_dma_controller *controller = private_data;
 	struct musb *musb = controller->private_data;
@@ -291,6 +286,9 @@ static irqreturn_t dma_controller_irq(int irq, void *private_data)
 
 	int_hsdma = musb_readb(mbase, MUSB_HSDMA_INTR);
 
+	/* some platform needs clear pending interrupts by manual */
+	musb_clearb(musb->mregs, MUSB_HSDMA_INTR, int_hsdma);
+
 	if (!int_hsdma) {
 		musb_dbg(musb, "spurious DMA irq");
 
@@ -382,6 +380,7 @@ static irqreturn_t dma_controller_irq(int irq, void *private_data)
 	spin_unlock_irqrestore(&musb->lock, flags);
 	return retval;
 }
+EXPORT_SYMBOL_GPL(dma_controller_irq);
 
 void musbhs_dma_controller_destroy(struct dma_controller *c)
 {
@@ -397,18 +396,10 @@ void musbhs_dma_controller_destroy(struct dma_controller *c)
 }
 EXPORT_SYMBOL_GPL(musbhs_dma_controller_destroy);
 
-struct dma_controller *musbhs_dma_controller_create(struct musb *musb,
+static struct musb_dma_controller *dma_controller_alloc(struct musb *musb,
 						    void __iomem *base)
 {
 	struct musb_dma_controller *controller;
-	struct device *dev = musb->controller;
-	struct platform_device *pdev = to_platform_device(dev);
-	int irq = platform_get_irq_byname(pdev, "dma");
-
-	if (irq <= 0) {
-		dev_err(dev, "No DMA interrupt line!\n");
-		return NULL;
-	}
 
 	controller = kzalloc(sizeof(*controller), GFP_KERNEL);
 	if (!controller)
@@ -422,6 +413,25 @@ struct dma_controller *musbhs_dma_controller_create(struct musb *musb,
 	controller->controller.channel_release = dma_channel_release;
 	controller->controller.channel_program = dma_channel_program;
 	controller->controller.channel_abort = dma_channel_abort;
+	return controller;
+}
+
+struct dma_controller *musbhs_dma_controller_create(struct musb *musb,
+						    void __iomem *base)
+{
+	struct musb_dma_controller *controller;
+	struct device *dev = musb->controller;
+	struct platform_device *pdev = to_platform_device(dev);
+	int irq = platform_get_irq_byname(pdev, "dma");
+
+	if (irq <= 0) {
+		dev_err(dev, "No DMA interrupt line!\n");
+		return NULL;
+	}
+
+	controller = dma_controller_alloc(musb, base);
+	if (!controller)
+		return NULL;
 
 	if (request_irq(irq, dma_controller_irq, 0,
 			dev_name(musb->controller), &controller->controller)) {
@@ -436,3 +446,16 @@ struct dma_controller *musbhs_dma_controller_create(struct musb *musb,
 	return &controller->controller;
 }
 EXPORT_SYMBOL_GPL(musbhs_dma_controller_create);
+
+struct dma_controller *musbhs_dma_controller_create_noirq(struct musb *musb,
+						    void __iomem *base)
+{
+	struct musb_dma_controller *controller;
+
+	controller = dma_controller_alloc(musb, base);
+	if (!controller)
+		return NULL;
+
+	return &controller->controller;
+}
+EXPORT_SYMBOL_GPL(musbhs_dma_controller_create_noirq);
-- 
1.9.1

Re: [PATCH v2 4/4] usb: musb: Add support for MediaTek musb controller

[Bin Liu]

Hi Min,

very close, thanks.
Below I tried to explain a further cleanup in musb_clearb/w() and
musb_get/set_toggle() implementation. Please let me know if it is not
clear.

Basically, we don't need musb_default_clearb/w(), just assign the
musb_io function pointers to musb_readb/w().

Then the mtk platform musb_clearb/w() calls musb_readb/w() and
musb_writeb/w() to handle W1C.

On Tue, Jan 15, 2019 at 09:43:46AM +0800, min.guo@mediatek.com wrote:
> From: Min Guo <min.guo@mediatek.com>
> 
> This adds support for MediaTek musb controller in
> host, peripheral and otg mode.
> There are some quirk of MediaTek musb controller, such as:
>  -W1C interrupt status registers
>  -Private data toggle registers
>  -No dedicated DMA interrupt line
> 
> Signed-off-by: Min Guo <min.guo@mediatek.com>
> Signed-off-by: Yonglong Wu <yonglong.wu@mediatek.com>
> ---
>  drivers/usb/musb/Kconfig     |   8 +-
>  drivers/usb/musb/Makefile    |   1 +
>  drivers/usb/musb/mediatek.c  | 617 +++++++++++++++++++++++++++++++++++++++++++
>  drivers/usb/musb/musb_core.c |  69 +++++
>  drivers/usb/musb/musb_core.h |   9 +
>  drivers/usb/musb/musb_dma.h  |   9 +
>  drivers/usb/musb/musb_host.c |  26 +-
>  drivers/usb/musb/musb_io.h   |   6 +
>  drivers/usb/musb/musbhsdma.c |  55 ++--
>  9 files changed, 762 insertions(+), 38 deletions(-)
>  create mode 100644 drivers/usb/musb/mediatek.c
> 
> diff --git a/drivers/usb/musb/Kconfig b/drivers/usb/musb/Kconfig
> index ad08895..b72b7c1 100644
> --- a/drivers/usb/musb/Kconfig
> +++ b/drivers/usb/musb/Kconfig
> @@ -115,6 +115,12 @@ config USB_MUSB_JZ4740
>  	depends on USB_MUSB_GADGET
>  	depends on USB_OTG_BLACKLIST_HUB
>  
> +config USB_MUSB_MEDIATEK
> +	tristate "MediaTek platforms"
> +	depends on ARCH_MEDIATEK || COMPILE_TEST
> +	depends on NOP_USB_XCEIV
> +	depends on GENERIC_PHY
> +
>  config USB_MUSB_AM335X_CHILD
>  	tristate
>  
> @@ -141,7 +147,7 @@ config USB_UX500_DMA
>  
>  config USB_INVENTRA_DMA
>  	bool 'Inventra'
> -	depends on USB_MUSB_OMAP2PLUS
> +	depends on USB_MUSB_OMAP2PLUS || USB_MUSB_MEDIATEK
>  	help
>  	  Enable DMA transfers using Mentor's engine.
>  
> diff --git a/drivers/usb/musb/Makefile b/drivers/usb/musb/Makefile
> index 3a88c79..63d82d0 100644
> --- a/drivers/usb/musb/Makefile
> +++ b/drivers/usb/musb/Makefile
> @@ -24,6 +24,7 @@ obj-$(CONFIG_USB_MUSB_DA8XX)			+= da8xx.o
>  obj-$(CONFIG_USB_MUSB_UX500)			+= ux500.o
>  obj-$(CONFIG_USB_MUSB_JZ4740)			+= jz4740.o
>  obj-$(CONFIG_USB_MUSB_SUNXI)			+= sunxi.o
> +obj-$(CONFIG_USB_MUSB_MEDIATEK)      		+= mediatek.o
>  
>  
>  obj-$(CONFIG_USB_MUSB_AM335X_CHILD)		+= musb_am335x.o
> diff --git a/drivers/usb/musb/mediatek.c b/drivers/usb/musb/mediatek.c
> new file mode 100644
> index 0000000..7221989
> --- /dev/null
> +++ b/drivers/usb/musb/mediatek.c
> @@ -0,0 +1,617 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (C) 2018 MediaTek Inc.
> + *
> + * Author:
> + *  Min Guo <min.guo@mediatek.com>
> + *  Yonglong Wu <yonglong.wu@mediatek.com>
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/dma-mapping.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/usb/usb_phy_generic.h>
> +#include "musb_core.h"
> +#include "musb_dma.h"
> +
> +#define USB_L1INTS	0x00a0
> +#define USB_L1INTM	0x00a4
> +#define MTK_MUSB_TXFUNCADDR	0x0480
> +
> +/* MediaTek controller toggle enable and status reg */
> +#define MUSB_RXTOG		0x80
> +#define MUSB_RXTOGEN		0x82
> +#define MUSB_TXTOG		0x84
> +#define MUSB_TXTOGEN		0x86
> +
> +#define TX_INT_STATUS		BIT(0)
> +#define RX_INT_STATUS		BIT(1)
> +#define USBCOM_INT_STATUS	BIT(2)

missing a TAB for the alignment?

> +#define DMA_INT_STATUS		BIT(3)
> +
> +#define DMA_INTR_STATUS_MSK		GENMASK(7, 0)
> +#define DMA_INTR_UNMASK_SET_MSK	GENMASK(31, 24)
> +
> +enum mtk_vbus_id_state {
> +	MTK_ID_FLOAT = 1,
> +	MTK_ID_GROUND,
> +	MTK_VBUS_OFF,
> +	MTK_VBUS_VALID,
> +};
> +
> +struct mtk_glue {
> +	struct device *dev;
> +	struct musb *musb;
> +	struct platform_device *musb_pdev;
> +	struct platform_device *usb_phy;
> +	struct phy *phy;
> +	struct usb_phy *xceiv;
> +	enum phy_mode phy_mode;
> +	struct clk *main;
> +	struct clk *mcu;
> +	struct clk *univpll;
> +	struct regulator *vbus;
> +	struct extcon_dev *edev;
> +	struct notifier_block vbus_nb;
> +	struct notifier_block id_nb;
> +};
> +
> +static int mtk_musb_clks_get(struct mtk_glue *glue)
> +{
> +	struct device *dev = glue->dev;
> +
> +	glue->main = devm_clk_get(dev, "main");
> +	if (IS_ERR(glue->main)) {
> +		dev_err(dev, "fail to get main clock\n");
> +		return PTR_ERR(glue->main);
> +	}
> +
> +	glue->mcu = devm_clk_get(dev, "mcu");
> +	if (IS_ERR(glue->mcu)) {
> +		dev_err(dev, "fail to get mcu clock\n");
> +		return PTR_ERR(glue->mcu);
> +	}
> +
> +	glue->univpll = devm_clk_get(dev, "univpll");
> +	if (IS_ERR(glue->univpll)) {
> +		dev_err(dev, "fail to get univpll clock\n");
> +		return PTR_ERR(glue->univpll);
> +	}
> +
> +	return 0;
> +}
> +
> +static int mtk_musb_clks_enable(struct mtk_glue *glue)
> +{
> +	int ret;
> +
> +	ret = clk_prepare_enable(glue->main);
> +	if (ret) {
> +		dev_err(glue->dev, "failed to enable main clock\n");
> +		goto err_main_clk;
> +	}
> +
> +	ret = clk_prepare_enable(glue->mcu);
> +	if (ret) {
> +		dev_err(glue->dev, "failed to enable mcu clock\n");
> +		goto err_mcu_clk;
> +	}
> +
> +	ret = clk_prepare_enable(glue->univpll);
> +	if (ret) {
> +		dev_err(glue->dev, "failed to enable univpll clock\n");
> +		goto err_univpll_clk;
> +	}
> +
> +	return 0;
> +
> +err_univpll_clk:
> +	clk_disable_unprepare(glue->mcu);
> +err_mcu_clk:
> +	clk_disable_unprepare(glue->main);
> +err_main_clk:
> +	return ret;
> +}
> +
> +static void mtk_musb_clks_disable(struct mtk_glue *glue)
> +{
> +	clk_disable_unprepare(glue->univpll);
> +	clk_disable_unprepare(glue->mcu);
> +	clk_disable_unprepare(glue->main);
> +}
> +
> +static void mtk_musb_set_vbus(struct musb *musb, int is_on)
> +{
> +	struct device *dev = musb->controller;
> +	struct mtk_glue *glue = dev_get_drvdata(dev->parent);
> +	int ret;
> +
> +	/* vbus is optional */
> +	if (!glue->vbus)
> +		return;
> +
> +	dev_dbg(musb->controller, "%s, is_on=%d\r\n", __func__, is_on);
> +	if (is_on) {
> +		ret = regulator_enable(glue->vbus);
> +		if (ret) {
> +			dev_err(glue->dev, "fail to enable vbus regulator\n");
> +			return;
> +		}
> +	} else {
> +		regulator_disable(glue->vbus);
> +	}
> +}
> +
> +/*
> + * switch to host: -> MTK_VBUS_OFF --> MTK_ID_GROUND
> + * switch to device: -> MTK_ID_FLOAT --> MTK_VBUS_VALID
> + */
> +static void mtk_musb_set_mailbox(struct mtk_glue *glue,
> +	enum mtk_vbus_id_state status)

add one more TAB for params.

> +{
> +	struct musb *musb = glue->musb;
> +	u8 devctl = 0;
> +
> +	dev_dbg(glue->dev, "mailbox state(%d)\n", status);
> +	switch (status) {
> +	case MTK_ID_GROUND:
> +		phy_power_on(glue->phy);
> +		devctl = readb(musb->mregs + MUSB_DEVCTL);
> +		musb->xceiv->otg->state = OTG_STATE_A_WAIT_VRISE;
> +		mtk_musb_set_vbus(musb, 1);
> +		glue->phy_mode = PHY_MODE_USB_HOST;
> +		phy_set_mode(glue->phy, glue->phy_mode);
> +		devctl |= MUSB_DEVCTL_SESSION;
> +		musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
> +		MUSB_HST_MODE(musb);
> +		break;
> +	/*
> +	 * MTK_ID_FLOAT process is the same as MTK_VBUS_VALID
> +	 * except that turn off VBUS
> +	 */
> +	case MTK_ID_FLOAT:
> +		mtk_musb_set_vbus(musb, 0);
> +		/* fall through */
> +	case MTK_VBUS_OFF:
> +		musb->xceiv->otg->state = OTG_STATE_B_IDLE;
> +		devctl &= ~MUSB_DEVCTL_SESSION;
> +		musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
> +		phy_power_off(glue->phy);
> +		break;
> +	case MTK_VBUS_VALID:
> +		phy_power_on(glue->phy);
> +		glue->phy_mode = PHY_MODE_USB_DEVICE;
> +		phy_set_mode(glue->phy, glue->phy_mode);
> +		MUSB_DEV_MODE(musb);
> +		break;
> +	default:
> +		dev_err(glue->dev, "invalid state\n");
> +	}
> +}
> +
> +static int mtk_musb_id_notifier(struct notifier_block *nb,
> +	unsigned long event, void *ptr)
> +{
> +	struct mtk_glue *glue = container_of(nb, struct mtk_glue, id_nb);
> +
> +	if (event)
> +		mtk_musb_set_mailbox(glue, MTK_ID_GROUND);
> +	else
> +		mtk_musb_set_mailbox(glue, MTK_ID_FLOAT);
> +
> +	return NOTIFY_DONE;
> +}
> +
> +static int mtk_musb_vbus_notifier(struct notifier_block *nb,
> +	unsigned long event, void *ptr)
> +{
> +	struct mtk_glue *glue = container_of(nb, struct mtk_glue, vbus_nb);
> +
> +	if (event)
> +		mtk_musb_set_mailbox(glue, MTK_VBUS_VALID);
> +	else
> +		mtk_musb_set_mailbox(glue, MTK_VBUS_OFF);
> +
> +	return NOTIFY_DONE;
> +}
> +
> +static void mtk_otg_switch_init(struct mtk_glue *glue)
> +{
> +	int ret;
> +
> +	/* extcon is optional */
> +	if (!glue->edev)
> +		return;
> +
> +	glue->vbus_nb.notifier_call = mtk_musb_vbus_notifier;
> +	ret = devm_extcon_register_notifier(glue->dev, glue->edev, EXTCON_USB,
> +					&glue->vbus_nb);
> +	if (ret < 0)
> +		dev_err(glue->dev, "failed to register notifier for USB\n");
> +
> +	glue->id_nb.notifier_call = mtk_musb_id_notifier;
> +	ret = devm_extcon_register_notifier(glue->dev, glue->edev,
> +					EXTCON_USB_HOST, &glue->id_nb);
> +	if (ret < 0)
> +		dev_err(glue->dev, "failed to register notifier for USB-HOST\n");
> +
> +	dev_dbg(glue->dev, "EXTCON_USB: %d, EXTCON_USB_HOST: %d\n",
> +		extcon_get_state(glue->edev, EXTCON_USB),
> +		extcon_get_state(glue->edev, EXTCON_USB_HOST));
> +
> +	/* default as host, switch to device mode if needed */
> +	if (extcon_get_state(glue->edev, EXTCON_USB_HOST) == false)
> +		mtk_musb_set_mailbox(glue, MTK_ID_FLOAT);
> +	if (extcon_get_state(glue->edev, EXTCON_USB) == true)
> +		mtk_musb_set_mailbox(glue, MTK_VBUS_VALID);
> +}
> +
> +static irqreturn_t generic_interrupt(int irq, void *__hci)
> +{
> +	unsigned long flags;
> +	irqreturn_t retval = IRQ_NONE;
> +	struct musb *musb = __hci;
> +
> +	spin_lock_irqsave(&musb->lock, flags);
> +	musb->int_usb = musb_readb(musb->mregs, MUSB_INTRUSB) &
> +	    musb_readb(musb->mregs, MUSB_INTRUSBE);
> +	musb->int_tx = musb_readw(musb->mregs, MUSB_INTRTX)
> +	    & musb_readw(musb->mregs, MUSB_INTRTXE);
> +	musb->int_rx = musb_readw(musb->mregs, MUSB_INTRRX)
> +	    & musb_readw(musb->mregs, MUSB_INTRRXE);
> +	/* MediaTek controller interrupt status is W1C */
> +	musb_clearw(musb->mregs, MUSB_INTRRX, musb->int_rx);
> +	musb_clearw(musb->mregs, MUSB_INTRTX, musb->int_tx);
> +	musb_clearb(musb->mregs, MUSB_INTRUSB, musb->int_usb);
> +
> +	if (musb->int_usb || musb->int_tx || musb->int_rx)
> +		retval = musb_interrupt(musb);
> +
> +	spin_unlock_irqrestore(&musb->lock, flags);
> +
> +	return retval;
> +}
> +
> +static irqreturn_t mtk_musb_interrupt(int irq, void *dev_id)
> +{
> +	irqreturn_t retval = IRQ_NONE;
> +	struct musb *musb = (struct musb *)dev_id;
> +	u32 l1_ints;
> +
> +	l1_ints = musb_readl(musb->mregs, USB_L1INTS) &
> +			musb_readl(musb->mregs, USB_L1INTM);
> +
> +	if (l1_ints & (TX_INT_STATUS | RX_INT_STATUS | USBCOM_INT_STATUS))
> +		retval = generic_interrupt(irq, musb);
> +
> +#if defined(CONFIG_USB_INVENTRA_DMA)
> +	if (l1_ints & DMA_INT_STATUS)
> +		retval = dma_controller_irq(irq, musb->dma_controller);
> +#endif
> +	return retval;
> +}
> +
> +static u32 mtk_musb_busctl_offset(u8 epnum, u16 offset)
> +{
> +	return MTK_MUSB_TXFUNCADDR + offset + 8 * epnum;
> +}
> +
> +static void mtk_musb_clearb(void __iomem *addr, unsigned int offset, u8 data)

remove 'u8 data' parameter, then add:

> +{

	u8 data;

> +	/* W1C */
	data = musb_readb(addr, offset);
> +	musb_writeb(addr, offset, data);
> +}
> +
> +static void mtk_musb_clearw(void __iomem *addr, unsigned int offset, u16 data)
> +{
> +	/* W1C */
> +	musb_writew(addr, offset, data);
> +}

similar as mtk_musb_clearb() above.

> +
> +static int mtk_musb_init(struct musb *musb)
> +{
> +	struct device *dev = musb->controller;
> +	struct mtk_glue *glue = dev_get_drvdata(dev->parent);
> +	int ret;

[snip]

> +	if (pdata->mode == USB_DR_MODE_OTG)
> +		mtk_otg_switch_init(glue);
> +
> +	dev_info(dev, "USB probe done!\n");

not really useful, can be removed.

> +	return 0;
> +
> +err_device_register:
> +	mtk_musb_clks_disable(glue);
> +err_enable_clk:
> +	pm_runtime_put_sync(dev);
> +	pm_runtime_disable(dev);
> +err_unregister_usb_phy:
> +	usb_phy_generic_unregister(glue->usb_phy);
> +	return ret;
> +}
> +
> +static int mtk_musb_remove(struct platform_device *pdev)
> +{
> +	struct mtk_glue *glue = platform_get_drvdata(pdev);
> +	struct platform_device *usb_phy = glue->usb_phy;
> +
> +	platform_device_unregister(glue->musb_pdev);
> +	usb_phy_generic_unregister(usb_phy);
> +
> +	return 0;
> +}
> +
> +#ifdef CONFIG_OF
> +static const struct of_device_id mtk_musb_match[] = {
> +	{.compatible = "mediatek,mtk-musb",},
> +	{},
> +};
> +MODULE_DEVICE_TABLE(of, mtk_musb_match);
> +#endif
> +
> +static struct platform_driver mtk_musb_driver = {
> +	.probe = mtk_musb_probe,
> +	.remove = mtk_musb_remove,
> +	.driver = {
> +		   .name = "musb-mtk",
> +		   .of_match_table = of_match_ptr(mtk_musb_match),
> +	},
> +};
> +
> +module_platform_driver(mtk_musb_driver);
> +
> +MODULE_DESCRIPTION("MediaTek MUSB Glue Layer");
> +MODULE_AUTHOR("Min Guo <min.guo@mediatek.com>");
> +MODULE_LICENSE("GPL v2");
> diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c
> index b7d5627..2c0d102 100644
> --- a/drivers/usb/musb/musb_core.c
> +++ b/drivers/usb/musb/musb_core.c
> @@ -260,6 +260,11 @@ static void musb_default_writeb(void __iomem *addr, unsigned offset, u8 data)
>  	__raw_writeb(data, addr + offset);
>  }
>  
> +static void
> +musb_default_clearb(void __iomem *addr, unsigned int offset, u8 data)
> +{
> +}

don't need this, use musb_readb() for the function pointer.

> +
>  static u16 musb_default_readw(const void __iomem *addr, unsigned offset)
>  {
>  	u16 data = __raw_readw(addr + offset);
> @@ -274,6 +279,43 @@ static void musb_default_writew(void __iomem *addr, unsigned offset, u16 data)
>  	__raw_writew(data, addr + offset);
>  }
>  
> +static void
> +musb_default_clearw(void __iomem *addr, unsigned int offset, u16 data)
> +{
> +}

don't need this, use musb_readw() for the function pointer.

> +
> +static u16 musb_default_get_toggle(struct musb_qh *qh, int is_in)
> +{
> +	void __iomem *epio = qh->hw_ep->regs;
> +	u16 csr;
> +
> +	if (is_in)
> +		csr = musb_readw(epio, MUSB_RXCSR) & MUSB_RXCSR_H_DATATOGGLE;
> +	else
> +		csr = musb_readw(epio, MUSB_TXCSR) & MUSB_TXCSR_H_DATATOGGLE;
> +
> +	return csr;
> +}
> +
> +static u16 musb_default_set_toggle(struct musb_qh *qh, int is_in,
> +	struct urb *urb)
> +{
> +	u16 csr = 0;
> +	u16 toggle = 0;

no need to assign them 0.

> +
> +	toggle = usb_gettoggle(urb->dev, qh->epnum, !is_in);
> +
> +	if (is_in)
> +		csr = toggle ? (MUSB_RXCSR_H_WR_DATATOGGLE
> +				| MUSB_RXCSR_H_DATATOGGLE) : 0;
> +	else
> +		csr |= toggle ? (MUSB_TXCSR_H_WR_DATATOGGLE
> +				| MUSB_TXCSR_H_DATATOGGLE)
> +				: MUSB_TXCSR_CLRDATATOG;
> +
> +	return csr;
> +}
> +
>  /*
>   * Load an endpoint's FIFO
>   */
> @@ -370,12 +412,18 @@ static void musb_default_read_fifo(struct musb_hw_ep *hw_ep, u16 len, u8 *dst)
>  void (*musb_writeb)(void __iomem *addr, unsigned offset, u8 data);
>  EXPORT_SYMBOL_GPL(musb_writeb);
>  
> +void (*musb_clearb)(void __iomem *addr, unsigned int offset, u8 data);
> +EXPORT_SYMBOL_GPL(musb_clearb);
> +
>  u16 (*musb_readw)(const void __iomem *addr, unsigned offset);
>  EXPORT_SYMBOL_GPL(musb_readw);
>  
>  void (*musb_writew)(void __iomem *addr, unsigned offset, u16 data);
>  EXPORT_SYMBOL_GPL(musb_writew);
>  
> +void (*musb_clearw)(void __iomem *addr, unsigned int offset, u16 data);
> +EXPORT_SYMBOL_GPL(musb_clearw);
> +
>  u32 musb_readl(const void __iomem *addr, unsigned offset)
>  {
>  	u32 data = __raw_readl(addr + offset);
> @@ -1028,6 +1076,11 @@ static void musb_disable_interrupts(struct musb *musb)
>  	temp = musb_readb(mbase, MUSB_INTRUSB);
>  	temp = musb_readw(mbase, MUSB_INTRTX);
>  	temp = musb_readw(mbase, MUSB_INTRRX);

replace the 3 line above with
	musb_clearb/w();

> +
> +	/* some platform needs clear pending interrupts by manual */
> +	musb_clearb(mbase, MUSB_INTRUSB, musb_readb(mbase, MUSB_INTRUSB));
> +	musb_clearw(mbase, MUSB_INTRRX, musb_readw(mbase, MUSB_INTRRX));
> +	musb_clearw(mbase, MUSB_INTRTX, musb_readw(mbase, MUSB_INTRTX));

then those are no longer needed.

>  }
>  
>  static void musb_enable_interrupts(struct musb *musb)
> @@ -2192,6 +2245,8 @@ static void musb_deassert_reset(struct work_struct *work)
>  	musb_writeb = musb_default_writeb;
>  	musb_readw = musb_default_readw;
>  	musb_writew = musb_default_writew;
> +	musb_clearb = musb_default_clearb;
> +	musb_clearw = musb_default_clearw;
>  
>  	/* The musb_platform_init() call:
>  	 *   - adjusts musb->mregs
> @@ -2252,10 +2307,14 @@ static void musb_deassert_reset(struct work_struct *work)
>  		musb_readb = musb->ops->readb;
>  	if (musb->ops->writeb)
>  		musb_writeb = musb->ops->writeb;
> +	if (musb->ops->clearb)
> +		musb_clearb = musb->ops->clearb;
	else
		musb_clearb = musb_readb;

>  	if (musb->ops->readw)
>  		musb_readw = musb->ops->readw;
>  	if (musb->ops->writew)
>  		musb_writew = musb->ops->writew;
> +	if (musb->ops->clearw)
> +		musb_clearw = musb->ops->clearw;
	else
		musb_clearw = musb_readw;
>  
>  #ifndef CONFIG_MUSB_PIO_ONLY
>  	if (!musb->ops->dma_init || !musb->ops->dma_exit) {
> @@ -2277,6 +2336,16 @@ static void musb_deassert_reset(struct work_struct *work)
>  	else
>  		musb->io.write_fifo = musb_default_write_fifo;
>  
> +	if (musb->ops->get_toggle)
> +		musb->io.get_toggle = musb->ops->get_toggle;
> +	else
> +		musb->io.get_toggle = musb_default_get_toggle;
> +
> +	if (musb->ops->set_toggle)
> +		musb->io.set_toggle = musb->ops->set_toggle;
> +	else
> +		musb->io.set_toggle = musb_default_set_toggle;
> +
>  	if (!musb->xceiv->io_ops) {
>  		musb->xceiv->io_dev = musb->controller;
>  		musb->xceiv->io_priv = musb->mregs;
> diff --git a/drivers/usb/musb/musb_core.h b/drivers/usb/musb/musb_core.h
> index 04203b7..71dca80 100644
> --- a/drivers/usb/musb/musb_core.h
> +++ b/drivers/usb/musb/musb_core.h
> @@ -27,6 +27,7 @@
>  struct musb;
>  struct musb_hw_ep;
>  struct musb_ep;
> +struct musb_qh;
>  
>  /* Helper defines for struct musb->hwvers */
>  #define MUSB_HWVERS_MAJOR(x)	((x >> 10) & 0x1f)
> @@ -119,10 +120,14 @@ enum musb_g_ep0_state {
>   * @fifo_offset: returns the fifo offset
>   * @readb:	read 8 bits
>   * @writeb:	write 8 bits
> + * @clearb:	clear 8 bits,

add "could be clear-on-read or W1C" to give more info.

>   * @readw:	read 16 bits
>   * @writew:	write 16 bits
> + * @clearw:	clear 16 bits
>   * @read_fifo:	reads the fifo
>   * @write_fifo:	writes to fifo
> + * @get_toggle:	platform specific get toggle function
> + * @set_toggle:	platform specific set toggle function
>   * @dma_init:	platform specific dma init function
>   * @dma_exit:	platform specific dma exit function
>   * @init:	turns on clocks, sets up platform-specific registers, etc
> @@ -163,10 +168,14 @@ struct musb_platform_ops {
>  	u32	(*busctl_offset)(u8 epnum, u16 offset);
>  	u8	(*readb)(const void __iomem *addr, unsigned offset);
>  	void	(*writeb)(void __iomem *addr, unsigned offset, u8 data);
> +	void	(*clearb)(void __iomem *addr, unsigned int offset, u8 data);
>  	u16	(*readw)(const void __iomem *addr, unsigned offset);
>  	void	(*writew)(void __iomem *addr, unsigned offset, u16 data);
> +	void	(*clearw)(void __iomem *addr, unsigned int offset, u16 data);
>  	void	(*read_fifo)(struct musb_hw_ep *hw_ep, u16 len, u8 *buf);
>  	void	(*write_fifo)(struct musb_hw_ep *hw_ep, u16 len, const u8 *buf);
> +	u16	(*get_toggle)(struct musb_qh *qh, int is_in);
> +	u16	(*set_toggle)(struct musb_qh *qh, int is_in, struct urb *urb);
>  	struct dma_controller *
>  		(*dma_init) (struct musb *musb, void __iomem *base);
>  	void	(*dma_exit)(struct dma_controller *c);
> diff --git a/drivers/usb/musb/musb_dma.h b/drivers/usb/musb/musb_dma.h
> index 8f60271..05103ea 100644
> --- a/drivers/usb/musb/musb_dma.h
> +++ b/drivers/usb/musb/musb_dma.h
> @@ -35,6 +35,12 @@
>   *    whether shared with the Inventra core or separate.
>   */
>  
> +#define MUSB_HSDMA_BASE		0x200
> +#define MUSB_HSDMA_INTR		(MUSB_HSDMA_BASE + 0)
> +#define MUSB_HSDMA_CONTROL		0x4
> +#define MUSB_HSDMA_ADDRESS		0x8
> +#define MUSB_HSDMA_COUNT		0xc
> +
>  #define	DMA_ADDR_INVALID	(~(dma_addr_t)0)
>  
>  #ifdef CONFIG_MUSB_PIO_ONLY
> @@ -191,6 +197,9 @@ static inline void musb_dma_controller_destroy(struct dma_controller *d) { }
>  extern struct dma_controller *
>  musbhs_dma_controller_create(struct musb *musb, void __iomem *base);
>  extern void musbhs_dma_controller_destroy(struct dma_controller *c);
> +extern struct dma_controller *
> +musbhs_dma_controller_create_noirq(struct musb *musb, void __iomem *base);
> +extern irqreturn_t dma_controller_irq(int irq, void *private_data);
>  
>  extern struct dma_controller *
>  tusb_dma_controller_create(struct musb *musb, void __iomem *base);
> diff --git a/drivers/usb/musb/musb_host.c b/drivers/usb/musb/musb_host.c
> index 16d0ba4..ba66f44 100644
> --- a/drivers/usb/musb/musb_host.c
> +++ b/drivers/usb/musb/musb_host.c
> @@ -290,39 +290,23 @@ static void musb_giveback(struct musb *musb, struct urb *urb, int status)
>  static inline void musb_save_toggle(struct musb_qh *qh, int is_in,
>  				    struct urb *urb)
>  {
> -	void __iomem		*epio = qh->hw_ep->regs;
> -	u16			csr;
> +	struct musb *musb = qh->hw_ep->musb;
> +	u16 csr;
>  
>  	/*
>  	 * FIXME: the current Mentor DMA code seems to have
>  	 * problems getting toggle correct.
>  	 */
> -
> -	if (is_in)
> -		csr = musb_readw(epio, MUSB_RXCSR) & MUSB_RXCSR_H_DATATOGGLE;
> -	else
> -		csr = musb_readw(epio, MUSB_TXCSR) & MUSB_TXCSR_H_DATATOGGLE;
> -
> +	csr = musb->io.get_toggle(qh, is_in);
>  	usb_settoggle(urb->dev, qh->epnum, !is_in, csr ? 1 : 0);
>  }
>  
>  static inline u16 musb_set_toggle(struct musb_qh *qh, int is_in,
>  	struct urb *urb)
>  {
> -	u16 csr = 0;
> -	u16 toggle = 0;
> -
> -	toggle = usb_gettoggle(urb->dev, qh->epnum, !is_in);
> -
> -	if (is_in)
> -		csr = toggle ? (MUSB_RXCSR_H_WR_DATATOGGLE
> -				| MUSB_RXCSR_H_DATATOGGLE) : 0;
> -	else
> -		csr = toggle ? (MUSB_TXCSR_H_WR_DATATOGGLE
> -				| MUSB_TXCSR_H_DATATOGGLE)
> -				: MUSB_TXCSR_CLRDATATOG;
> +	struct musb *musb = qh->hw_ep->musb;
>  
> -	return csr;
> +	return musb->io.set_toggle(qh, is_in, urb);
>  }

Those two functions - musb_save_toggle() and musb_set_toggle() are very
short now, we can get rid of them, and directly use
musb->io.get/set_toggle().

>  
>  /*
> diff --git a/drivers/usb/musb/musb_io.h b/drivers/usb/musb/musb_io.h
> index 8058a58..9bae09b 100644
> --- a/drivers/usb/musb/musb_io.h
> +++ b/drivers/usb/musb/musb_io.h
> @@ -22,6 +22,8 @@
>   * @read_fifo:	platform specific function to read fifo
>   * @write_fifo:	platform specific function to write fifo
>   * @busctl_offset: platform specific function to get busctl offset
> + * @get_toggle: platform specific function to get toggle
> + * @set_toggle: platform specific function to set toggle
>   */
>  struct musb_io {
>  	u32	(*ep_offset)(u8 epnum, u16 offset);
> @@ -30,13 +32,17 @@ struct musb_io {
>  	void	(*read_fifo)(struct musb_hw_ep *hw_ep, u16 len, u8 *buf);
>  	void	(*write_fifo)(struct musb_hw_ep *hw_ep, u16 len, const u8 *buf);
>  	u32	(*busctl_offset)(u8 epnum, u16 offset);
> +	u16	(*get_toggle)(struct musb_qh *qh, int is_in);
> +	u16	(*set_toggle)(struct musb_qh *qh, int is_in, struct urb *urb);
>  };
>  
>  /* Do not add new entries here, add them the struct musb_io instead */
>  extern u8 (*musb_readb)(const void __iomem *addr, unsigned offset);
>  extern void (*musb_writeb)(void __iomem *addr, unsigned offset, u8 data);
> +extern void (*musb_clearb)(void __iomem *addr, unsigned int offset, u8 data);
>  extern u16 (*musb_readw)(const void __iomem *addr, unsigned offset);
>  extern void (*musb_writew)(void __iomem *addr, unsigned offset, u16 data);
> +extern void (*musb_clearw)(void __iomem *addr, unsigned int offset, u16 data);
>  extern u32 musb_readl(const void __iomem *addr, unsigned offset);
>  extern void musb_writel(void __iomem *addr, unsigned offset, u32 data);
>  
> diff --git a/drivers/usb/musb/musbhsdma.c b/drivers/usb/musb/musbhsdma.c
> index a688f7f..b05fe68 100644
> --- a/drivers/usb/musb/musbhsdma.c
> +++ b/drivers/usb/musb/musbhsdma.c
> @@ -10,12 +10,7 @@
>  #include <linux/platform_device.h>
>  #include <linux/slab.h>
>  #include "musb_core.h"
> -
> -#define MUSB_HSDMA_BASE		0x200
> -#define MUSB_HSDMA_INTR		(MUSB_HSDMA_BASE + 0)
> -#define MUSB_HSDMA_CONTROL		0x4
> -#define MUSB_HSDMA_ADDRESS		0x8
> -#define MUSB_HSDMA_COUNT		0xc
> +#include "musb_dma.h"
>  
>  #define MUSB_HSDMA_CHANNEL_OFFSET(_bchannel, _offset)		\
>  		(MUSB_HSDMA_BASE + (_bchannel << 4) + _offset)
> @@ -268,7 +263,7 @@ static int dma_channel_abort(struct dma_channel *channel)
>  	return 0;
>  }
>  
> -static irqreturn_t dma_controller_irq(int irq, void *private_data)
> +irqreturn_t dma_controller_irq(int irq, void *private_data)
>  {
>  	struct musb_dma_controller *controller = private_data;
>  	struct musb *musb = controller->private_data;
> @@ -291,6 +286,9 @@ static irqreturn_t dma_controller_irq(int irq, void *private_data)
>  
>  	int_hsdma = musb_readb(mbase, MUSB_HSDMA_INTR);
>  
> +	/* some platform needs clear pending interrupts by manual */
> +	musb_clearb(musb->mregs, MUSB_HSDMA_INTR, int_hsdma);
> +
>  	if (!int_hsdma) {
>  		musb_dbg(musb, "spurious DMA irq");
>  
> @@ -382,6 +380,7 @@ static irqreturn_t dma_controller_irq(int irq, void *private_data)
>  	spin_unlock_irqrestore(&musb->lock, flags);
>  	return retval;
>  }
> +EXPORT_SYMBOL_GPL(dma_controller_irq);
>  
>  void musbhs_dma_controller_destroy(struct dma_controller *c)
>  {
> @@ -397,18 +396,10 @@ void musbhs_dma_controller_destroy(struct dma_controller *c)
>  }
>  EXPORT_SYMBOL_GPL(musbhs_dma_controller_destroy);
>  
> -struct dma_controller *musbhs_dma_controller_create(struct musb *musb,
> +static struct musb_dma_controller *dma_controller_alloc(struct musb *musb,
>  						    void __iomem *base)
>  {
>  	struct musb_dma_controller *controller;
> -	struct device *dev = musb->controller;
> -	struct platform_device *pdev = to_platform_device(dev);
> -	int irq = platform_get_irq_byname(pdev, "dma");
> -
> -	if (irq <= 0) {
> -		dev_err(dev, "No DMA interrupt line!\n");
> -		return NULL;
> -	}
>  
>  	controller = kzalloc(sizeof(*controller), GFP_KERNEL);
>  	if (!controller)
> @@ -422,6 +413,25 @@ struct dma_controller *musbhs_dma_controller_create(struct musb *musb,
>  	controller->controller.channel_release = dma_channel_release;
>  	controller->controller.channel_program = dma_channel_program;
>  	controller->controller.channel_abort = dma_channel_abort;
> +	return controller;
> +}
> +
> +struct dma_controller *musbhs_dma_controller_create(struct musb *musb,
> +						    void __iomem *base)
> +{
> +	struct musb_dma_controller *controller;
> +	struct device *dev = musb->controller;
> +	struct platform_device *pdev = to_platform_device(dev);
> +	int irq = platform_get_irq_byname(pdev, "dma");
> +
> +	if (irq <= 0) {
> +		dev_err(dev, "No DMA interrupt line!\n");
> +		return NULL;
> +	}
> +
> +	controller = dma_controller_alloc(musb, base);
> +	if (!controller)
> +		return NULL;
>  
>  	if (request_irq(irq, dma_controller_irq, 0,
>  			dev_name(musb->controller), &controller->controller)) {
> @@ -436,3 +446,16 @@ struct dma_controller *musbhs_dma_controller_create(struct musb *musb,
>  	return &controller->controller;
>  }
>  EXPORT_SYMBOL_GPL(musbhs_dma_controller_create);
> +
> +struct dma_controller *musbhs_dma_controller_create_noirq(struct musb *musb,
> +						    void __iomem *base)
> +{
> +	struct musb_dma_controller *controller;
> +
> +	controller = dma_controller_alloc(musb, base);
> +	if (!controller)
> +		return NULL;
> +
> +	return &controller->controller;
> +}
> +EXPORT_SYMBOL_GPL(musbhs_dma_controller_create_noirq);

regards,
-Bin.

Re: [PATCH v2 4/4] usb: musb: Add support for MediaTek musb controller

[Min Guo]

Hi Bin,

On Tue, 2019-01-15 at 14:38 -0600, Bin Liu wrote:
> Hi Min,
> 
> very close, thanks.
> Below I tried to explain a further cleanup in musb_clearb/w() and
> musb_get/set_toggle() implementation. Please let me know if it is not
> clear.
> 
> Basically, we don't need musb_default_clearb/w(), just assign the
> musb_io function pointers to musb_readb/w().
> 
> Then the mtk platform musb_clearb/w() calls musb_readb/w() and
> musb_writeb/w() to handle W1C.

Okay.

> On Tue, Jan 15, 2019 at 09:43:46AM +0800, min.guo@mediatek.com wrote:
> > From: Min Guo <min.guo@mediatek.com>
> > 
> > This adds support for MediaTek musb controller in
> > host, peripheral and otg mode.
> > There are some quirk of MediaTek musb controller, such as:
> >  -W1C interrupt status registers
> >  -Private data toggle registers
> >  -No dedicated DMA interrupt line
> > 
> > Signed-off-by: Min Guo <min.guo@mediatek.com>
> > Signed-off-by: Yonglong Wu <yonglong.wu@mediatek.com>
> > ---
> >  drivers/usb/musb/Kconfig     |   8 +-
> >  drivers/usb/musb/Makefile    |   1 +
> >  drivers/usb/musb/mediatek.c  | 617 +++++++++++++++++++++++++++++++++++++++++++
> >  drivers/usb/musb/musb_core.c |  69 +++++
> >  drivers/usb/musb/musb_core.h |   9 +
> >  drivers/usb/musb/musb_dma.h  |   9 +
> >  drivers/usb/musb/musb_host.c |  26 +-
> >  drivers/usb/musb/musb_io.h   |   6 +
> >  drivers/usb/musb/musbhsdma.c |  55 ++--
> >  9 files changed, 762 insertions(+), 38 deletions(-)
> >  create mode 100644 drivers/usb/musb/mediatek.c
> > 
> > diff --git a/drivers/usb/musb/Kconfig b/drivers/usb/musb/Kconfig
> > index ad08895..b72b7c1 100644
> > --- a/drivers/usb/musb/Kconfig
> > +++ b/drivers/usb/musb/Kconfig
> > @@ -115,6 +115,12 @@ config USB_MUSB_JZ4740
> >  	depends on USB_MUSB_GADGET
> >  	depends on USB_OTG_BLACKLIST_HUB
> >  
> > +config USB_MUSB_MEDIATEK
> > +	tristate "MediaTek platforms"
> > +	depends on ARCH_MEDIATEK || COMPILE_TEST
> > +	depends on NOP_USB_XCEIV
> > +	depends on GENERIC_PHY
> > +
> >  config USB_MUSB_AM335X_CHILD
> >  	tristate
> >  
> > @@ -141,7 +147,7 @@ config USB_UX500_DMA
> >  
> >  config USB_INVENTRA_DMA
> >  	bool 'Inventra'
> > -	depends on USB_MUSB_OMAP2PLUS
> > +	depends on USB_MUSB_OMAP2PLUS || USB_MUSB_MEDIATEK
> >  	help
> >  	  Enable DMA transfers using Mentor's engine.
> >  
> > diff --git a/drivers/usb/musb/Makefile b/drivers/usb/musb/Makefile
> > index 3a88c79..63d82d0 100644
> > --- a/drivers/usb/musb/Makefile
> > +++ b/drivers/usb/musb/Makefile
> > @@ -24,6 +24,7 @@ obj-$(CONFIG_USB_MUSB_DA8XX)			+= da8xx.o
> >  obj-$(CONFIG_USB_MUSB_UX500)			+= ux500.o
> >  obj-$(CONFIG_USB_MUSB_JZ4740)			+= jz4740.o
> >  obj-$(CONFIG_USB_MUSB_SUNXI)			+= sunxi.o
> > +obj-$(CONFIG_USB_MUSB_MEDIATEK)      		+= mediatek.o
> >  
> >  
> >  obj-$(CONFIG_USB_MUSB_AM335X_CHILD)		+= musb_am335x.o
> > diff --git a/drivers/usb/musb/mediatek.c b/drivers/usb/musb/mediatek.c
> > new file mode 100644
> > index 0000000..7221989
> > --- /dev/null
> > +++ b/drivers/usb/musb/mediatek.c
> > @@ -0,0 +1,617 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * Copyright (C) 2018 MediaTek Inc.
> > + *
> > + * Author:
> > + *  Min Guo <min.guo@mediatek.com>
> > + *  Yonglong Wu <yonglong.wu@mediatek.com>
> > + */
> > +
> > +#include <linux/clk.h>
> > +#include <linux/dma-mapping.h>
> > +#include <linux/module.h>
> > +#include <linux/platform_device.h>
> > +#include <linux/usb/usb_phy_generic.h>
> > +#include "musb_core.h"
> > +#include "musb_dma.h"
> > +
> > +#define USB_L1INTS	0x00a0
> > +#define USB_L1INTM	0x00a4
> > +#define MTK_MUSB_TXFUNCADDR	0x0480
> > +
> > +/* MediaTek controller toggle enable and status reg */
> > +#define MUSB_RXTOG		0x80
> > +#define MUSB_RXTOGEN		0x82
> > +#define MUSB_TXTOG		0x84
> > +#define MUSB_TXTOGEN		0x86
> > +
> > +#define TX_INT_STATUS		BIT(0)
> > +#define RX_INT_STATUS		BIT(1)
> > +#define USBCOM_INT_STATUS	BIT(2)
> 
> missing a TAB for the alignment?

Okay.

> > +#define DMA_INT_STATUS		BIT(3)
> > +
> > +#define DMA_INTR_STATUS_MSK		GENMASK(7, 0)
> > +#define DMA_INTR_UNMASK_SET_MSK	GENMASK(31, 24)
> > +
> > +enum mtk_vbus_id_state {
> > +	MTK_ID_FLOAT = 1,
> > +	MTK_ID_GROUND,
> > +	MTK_VBUS_OFF,
> > +	MTK_VBUS_VALID,
> > +};
> > +
> > +struct mtk_glue {
> > +	struct device *dev;
> > +	struct musb *musb;
> > +	struct platform_device *musb_pdev;
> > +	struct platform_device *usb_phy;
> > +	struct phy *phy;
> > +	struct usb_phy *xceiv;
> > +	enum phy_mode phy_mode;
> > +	struct clk *main;
> > +	struct clk *mcu;
> > +	struct clk *univpll;
> > +	struct regulator *vbus;
> > +	struct extcon_dev *edev;
> > +	struct notifier_block vbus_nb;
> > +	struct notifier_block id_nb;
> > +};
> > +
> > +static int mtk_musb_clks_get(struct mtk_glue *glue)
> > +{
> > +	struct device *dev = glue->dev;
> > +
> > +	glue->main = devm_clk_get(dev, "main");
> > +	if (IS_ERR(glue->main)) {
> > +		dev_err(dev, "fail to get main clock\n");
> > +		return PTR_ERR(glue->main);
> > +	}
> > +
> > +	glue->mcu = devm_clk_get(dev, "mcu");
> > +	if (IS_ERR(glue->mcu)) {
> > +		dev_err(dev, "fail to get mcu clock\n");
> > +		return PTR_ERR(glue->mcu);
> > +	}
> > +
> > +	glue->univpll = devm_clk_get(dev, "univpll");
> > +	if (IS_ERR(glue->univpll)) {
> > +		dev_err(dev, "fail to get univpll clock\n");
> > +		return PTR_ERR(glue->univpll);
> > +	}
> > +
> > +	return 0;
> > +}
> > +
> > +static int mtk_musb_clks_enable(struct mtk_glue *glue)
> > +{
> > +	int ret;
> > +
> > +	ret = clk_prepare_enable(glue->main);
> > +	if (ret) {
> > +		dev_err(glue->dev, "failed to enable main clock\n");
> > +		goto err_main_clk;
> > +	}
> > +
> > +	ret = clk_prepare_enable(glue->mcu);
> > +	if (ret) {
> > +		dev_err(glue->dev, "failed to enable mcu clock\n");
> > +		goto err_mcu_clk;
> > +	}
> > +
> > +	ret = clk_prepare_enable(glue->univpll);
> > +	if (ret) {
> > +		dev_err(glue->dev, "failed to enable univpll clock\n");
> > +		goto err_univpll_clk;
> > +	}
> > +
> > +	return 0;
> > +
> > +err_univpll_clk:
> > +	clk_disable_unprepare(glue->mcu);
> > +err_mcu_clk:
> > +	clk_disable_unprepare(glue->main);
> > +err_main_clk:
> > +	return ret;
> > +}
> > +
> > +static void mtk_musb_clks_disable(struct mtk_glue *glue)
> > +{
> > +	clk_disable_unprepare(glue->univpll);
> > +	clk_disable_unprepare(glue->mcu);
> > +	clk_disable_unprepare(glue->main);
> > +}
> > +
> > +static void mtk_musb_set_vbus(struct musb *musb, int is_on)
> > +{
> > +	struct device *dev = musb->controller;
> > +	struct mtk_glue *glue = dev_get_drvdata(dev->parent);
> > +	int ret;
> > +
> > +	/* vbus is optional */
> > +	if (!glue->vbus)
> > +		return;
> > +
> > +	dev_dbg(musb->controller, "%s, is_on=%d\r\n", __func__, is_on);
> > +	if (is_on) {
> > +		ret = regulator_enable(glue->vbus);
> > +		if (ret) {
> > +			dev_err(glue->dev, "fail to enable vbus regulator\n");
> > +			return;
> > +		}
> > +	} else {
> > +		regulator_disable(glue->vbus);
> > +	}
> > +}
> > +
> > +/*
> > + * switch to host: -> MTK_VBUS_OFF --> MTK_ID_GROUND
> > + * switch to device: -> MTK_ID_FLOAT --> MTK_VBUS_VALID
> > + */
> > +static void mtk_musb_set_mailbox(struct mtk_glue *glue,
> > +	enum mtk_vbus_id_state status)
> 
> add one more TAB for params.

Okay.

> > +{
> > +	struct musb *musb = glue->musb;
> > +	u8 devctl = 0;
> > +
> > +	dev_dbg(glue->dev, "mailbox state(%d)\n", status);
> > +	switch (status) {
> > +	case MTK_ID_GROUND:
> > +		phy_power_on(glue->phy);
> > +		devctl = readb(musb->mregs + MUSB_DEVCTL);
> > +		musb->xceiv->otg->state = OTG_STATE_A_WAIT_VRISE;
> > +		mtk_musb_set_vbus(musb, 1);
> > +		glue->phy_mode = PHY_MODE_USB_HOST;
> > +		phy_set_mode(glue->phy, glue->phy_mode);
> > +		devctl |= MUSB_DEVCTL_SESSION;
> > +		musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
> > +		MUSB_HST_MODE(musb);
> > +		break;
> > +	/*
> > +	 * MTK_ID_FLOAT process is the same as MTK_VBUS_VALID
> > +	 * except that turn off VBUS
> > +	 */
> > +	case MTK_ID_FLOAT:
> > +		mtk_musb_set_vbus(musb, 0);
> > +		/* fall through */
> > +	case MTK_VBUS_OFF:
> > +		musb->xceiv->otg->state = OTG_STATE_B_IDLE;
> > +		devctl &= ~MUSB_DEVCTL_SESSION;
> > +		musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
> > +		phy_power_off(glue->phy);
> > +		break;
> > +	case MTK_VBUS_VALID:
> > +		phy_power_on(glue->phy);
> > +		glue->phy_mode = PHY_MODE_USB_DEVICE;
> > +		phy_set_mode(glue->phy, glue->phy_mode);
> > +		MUSB_DEV_MODE(musb);
> > +		break;
> > +	default:
> > +		dev_err(glue->dev, "invalid state\n");
> > +	}
> > +}
> > +
> > +static int mtk_musb_id_notifier(struct notifier_block *nb,
> > +	unsigned long event, void *ptr)
> > +{
> > +	struct mtk_glue *glue = container_of(nb, struct mtk_glue, id_nb);
> > +
> > +	if (event)
> > +		mtk_musb_set_mailbox(glue, MTK_ID_GROUND);
> > +	else
> > +		mtk_musb_set_mailbox(glue, MTK_ID_FLOAT);
> > +
> > +	return NOTIFY_DONE;
> > +}
> > +
> > +static int mtk_musb_vbus_notifier(struct notifier_block *nb,
> > +	unsigned long event, void *ptr)
> > +{
> > +	struct mtk_glue *glue = container_of(nb, struct mtk_glue, vbus_nb);
> > +
> > +	if (event)
> > +		mtk_musb_set_mailbox(glue, MTK_VBUS_VALID);
> > +	else
> > +		mtk_musb_set_mailbox(glue, MTK_VBUS_OFF);
> > +
> > +	return NOTIFY_DONE;
> > +}
> > +
> > +static void mtk_otg_switch_init(struct mtk_glue *glue)
> > +{
> > +	int ret;
> > +
> > +	/* extcon is optional */
> > +	if (!glue->edev)
> > +		return;
> > +
> > +	glue->vbus_nb.notifier_call = mtk_musb_vbus_notifier;
> > +	ret = devm_extcon_register_notifier(glue->dev, glue->edev, EXTCON_USB,
> > +					&glue->vbus_nb);
> > +	if (ret < 0)
> > +		dev_err(glue->dev, "failed to register notifier for USB\n");
> > +
> > +	glue->id_nb.notifier_call = mtk_musb_id_notifier;
> > +	ret = devm_extcon_register_notifier(glue->dev, glue->edev,
> > +					EXTCON_USB_HOST, &glue->id_nb);
> > +	if (ret < 0)
> > +		dev_err(glue->dev, "failed to register notifier for USB-HOST\n");
> > +
> > +	dev_dbg(glue->dev, "EXTCON_USB: %d, EXTCON_USB_HOST: %d\n",
> > +		extcon_get_state(glue->edev, EXTCON_USB),
> > +		extcon_get_state(glue->edev, EXTCON_USB_HOST));
> > +
> > +	/* default as host, switch to device mode if needed */
> > +	if (extcon_get_state(glue->edev, EXTCON_USB_HOST) == false)
> > +		mtk_musb_set_mailbox(glue, MTK_ID_FLOAT);
> > +	if (extcon_get_state(glue->edev, EXTCON_USB) == true)
> > +		mtk_musb_set_mailbox(glue, MTK_VBUS_VALID);
> > +}
> > +
> > +static irqreturn_t generic_interrupt(int irq, void *__hci)
> > +{
> > +	unsigned long flags;
> > +	irqreturn_t retval = IRQ_NONE;
> > +	struct musb *musb = __hci;
> > +
> > +	spin_lock_irqsave(&musb->lock, flags);
> > +	musb->int_usb = musb_readb(musb->mregs, MUSB_INTRUSB) &
> > +	    musb_readb(musb->mregs, MUSB_INTRUSBE);
> > +	musb->int_tx = musb_readw(musb->mregs, MUSB_INTRTX)
> > +	    & musb_readw(musb->mregs, MUSB_INTRTXE);
> > +	musb->int_rx = musb_readw(musb->mregs, MUSB_INTRRX)
> > +	    & musb_readw(musb->mregs, MUSB_INTRRXE);
> > +	/* MediaTek controller interrupt status is W1C */
> > +	musb_clearw(musb->mregs, MUSB_INTRRX, musb->int_rx);
> > +	musb_clearw(musb->mregs, MUSB_INTRTX, musb->int_tx);
> > +	musb_clearb(musb->mregs, MUSB_INTRUSB, musb->int_usb);
> > +
> > +	if (musb->int_usb || musb->int_tx || musb->int_rx)
> > +		retval = musb_interrupt(musb);
> > +
> > +	spin_unlock_irqrestore(&musb->lock, flags);
> > +
> > +	return retval;
> > +}
> > +
> > +static irqreturn_t mtk_musb_interrupt(int irq, void *dev_id)
> > +{
> > +	irqreturn_t retval = IRQ_NONE;
> > +	struct musb *musb = (struct musb *)dev_id;
> > +	u32 l1_ints;
> > +
> > +	l1_ints = musb_readl(musb->mregs, USB_L1INTS) &
> > +			musb_readl(musb->mregs, USB_L1INTM);
> > +
> > +	if (l1_ints & (TX_INT_STATUS | RX_INT_STATUS | USBCOM_INT_STATUS))
> > +		retval = generic_interrupt(irq, musb);
> > +
> > +#if defined(CONFIG_USB_INVENTRA_DMA)
> > +	if (l1_ints & DMA_INT_STATUS)
> > +		retval = dma_controller_irq(irq, musb->dma_controller);
> > +#endif
> > +	return retval;
> > +}
> > +
> > +static u32 mtk_musb_busctl_offset(u8 epnum, u16 offset)
> > +{
> > +	return MTK_MUSB_TXFUNCADDR + offset + 8 * epnum;
> > +}
> > +
> > +static void mtk_musb_clearb(void __iomem *addr, unsigned int offset, u8 data)
> 
> remove 'u8 data' parameter, then add:

Okay.

> > +{
> 
> 	u8 data;
> 
> > +	/* W1C */
> 	data = musb_readb(addr, offset);
> > +	musb_writeb(addr, offset, data);
> > +}
> > +
> > +static void mtk_musb_clearw(void __iomem *addr, unsigned int offset, u16 data)
> > +{
> > +	/* W1C */
> > +	musb_writew(addr, offset, data);
> > +}
> 
> similar as mtk_musb_clearb() above.

Okay.

> > +
> > +static int mtk_musb_init(struct musb *musb)
> > +{
> > +	struct device *dev = musb->controller;
> > +	struct mtk_glue *glue = dev_get_drvdata(dev->parent);
> > +	int ret;
> 
> [snip]
> 
> > +	if (pdata->mode == USB_DR_MODE_OTG)
> > +		mtk_otg_switch_init(glue);
> > +
> > +	dev_info(dev, "USB probe done!\n");
> 
> not really useful, can be removed.

Okay.

> > +	return 0;
> > +
> > +err_device_register:
> > +	mtk_musb_clks_disable(glue);
> > +err_enable_clk:
> > +	pm_runtime_put_sync(dev);
> > +	pm_runtime_disable(dev);
> > +err_unregister_usb_phy:
> > +	usb_phy_generic_unregister(glue->usb_phy);
> > +	return ret;
> > +}
> > +
> > +static int mtk_musb_remove(struct platform_device *pdev)
> > +{
> > +	struct mtk_glue *glue = platform_get_drvdata(pdev);
> > +	struct platform_device *usb_phy = glue->usb_phy;
> > +
> > +	platform_device_unregister(glue->musb_pdev);
> > +	usb_phy_generic_unregister(usb_phy);
> > +
> > +	return 0;
> > +}
> > +
> > +#ifdef CONFIG_OF
> > +static const struct of_device_id mtk_musb_match[] = {
> > +	{.compatible = "mediatek,mtk-musb",},
> > +	{},
> > +};
> > +MODULE_DEVICE_TABLE(of, mtk_musb_match);
> > +#endif
> > +
> > +static struct platform_driver mtk_musb_driver = {
> > +	.probe = mtk_musb_probe,
> > +	.remove = mtk_musb_remove,
> > +	.driver = {
> > +		   .name = "musb-mtk",
> > +		   .of_match_table = of_match_ptr(mtk_musb_match),
> > +	},
> > +};
> > +
> > +module_platform_driver(mtk_musb_driver);
> > +
> > +MODULE_DESCRIPTION("MediaTek MUSB Glue Layer");
> > +MODULE_AUTHOR("Min Guo <min.guo@mediatek.com>");
> > +MODULE_LICENSE("GPL v2");
> > diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c
> > index b7d5627..2c0d102 100644
> > --- a/drivers/usb/musb/musb_core.c
> > +++ b/drivers/usb/musb/musb_core.c
> > @@ -260,6 +260,11 @@ static void musb_default_writeb(void __iomem *addr, unsigned offset, u8 data)
> >  	__raw_writeb(data, addr + offset);
> >  }
> >  
> > +static void
> > +musb_default_clearb(void __iomem *addr, unsigned int offset, u8 data)
> > +{
> > +}
> 
> don't need this, use musb_readb() for the function pointer.

Okay.

> > +
> >  static u16 musb_default_readw(const void __iomem *addr, unsigned offset)
> >  {
> >  	u16 data = __raw_readw(addr + offset);
> > @@ -274,6 +279,43 @@ static void musb_default_writew(void __iomem *addr, unsigned offset, u16 data)
> >  	__raw_writew(data, addr + offset);
> >  }
> >  
> > +static void
> > +musb_default_clearw(void __iomem *addr, unsigned int offset, u16 data)
> > +{
> > +}
> 
> don't need this, use musb_readw() for the function pointer.

Okay.

> > +
> > +static u16 musb_default_get_toggle(struct musb_qh *qh, int is_in)
> > +{
> > +	void __iomem *epio = qh->hw_ep->regs;
> > +	u16 csr;
> > +
> > +	if (is_in)
> > +		csr = musb_readw(epio, MUSB_RXCSR) & MUSB_RXCSR_H_DATATOGGLE;
> > +	else
> > +		csr = musb_readw(epio, MUSB_TXCSR) & MUSB_TXCSR_H_DATATOGGLE;
> > +
> > +	return csr;
> > +}
> > +
> > +static u16 musb_default_set_toggle(struct musb_qh *qh, int is_in,
> > +	struct urb *urb)
> > +{
> > +	u16 csr = 0;
> > +	u16 toggle = 0;
> 
> no need to assign them 0.

Okay.

> > +
> > +	toggle = usb_gettoggle(urb->dev, qh->epnum, !is_in);
> > +
> > +	if (is_in)
> > +		csr = toggle ? (MUSB_RXCSR_H_WR_DATATOGGLE
> > +				| MUSB_RXCSR_H_DATATOGGLE) : 0;
> > +	else
> > +		csr |= toggle ? (MUSB_TXCSR_H_WR_DATATOGGLE
> > +				| MUSB_TXCSR_H_DATATOGGLE)
> > +				: MUSB_TXCSR_CLRDATATOG;
> > +
> > +	return csr;
> > +}
> > +
> >  /*
> >   * Load an endpoint's FIFO
> >   */
> > @@ -370,12 +412,18 @@ static void musb_default_read_fifo(struct musb_hw_ep *hw_ep, u16 len, u8 *dst)
> >  void (*musb_writeb)(void __iomem *addr, unsigned offset, u8 data);
> >  EXPORT_SYMBOL_GPL(musb_writeb);
> >  
> > +void (*musb_clearb)(void __iomem *addr, unsigned int offset, u8 data);
> > +EXPORT_SYMBOL_GPL(musb_clearb);
> > +
> >  u16 (*musb_readw)(const void __iomem *addr, unsigned offset);
> >  EXPORT_SYMBOL_GPL(musb_readw);
> >  
> >  void (*musb_writew)(void __iomem *addr, unsigned offset, u16 data);
> >  EXPORT_SYMBOL_GPL(musb_writew);
> >  
> > +void (*musb_clearw)(void __iomem *addr, unsigned int offset, u16 data);
> > +EXPORT_SYMBOL_GPL(musb_clearw);
> > +
> >  u32 musb_readl(const void __iomem *addr, unsigned offset)
> >  {
> >  	u32 data = __raw_readl(addr + offset);
> > @@ -1028,6 +1076,11 @@ static void musb_disable_interrupts(struct musb *musb)
> >  	temp = musb_readb(mbase, MUSB_INTRUSB);
> >  	temp = musb_readw(mbase, MUSB_INTRTX);
> >  	temp = musb_readw(mbase, MUSB_INTRRX);
> 
> replace the 3 line above with
> 	musb_clearb/w();

Okay.

> > +
> > +	/* some platform needs clear pending interrupts by manual */
> > +	musb_clearb(mbase, MUSB_INTRUSB, musb_readb(mbase, MUSB_INTRUSB));
> > +	musb_clearw(mbase, MUSB_INTRRX, musb_readw(mbase, MUSB_INTRRX));
> > +	musb_clearw(mbase, MUSB_INTRTX, musb_readw(mbase, MUSB_INTRTX));
> 
> then those are no longer needed.

Okay.

> >  }
> >  
> >  static void musb_enable_interrupts(struct musb *musb)
> > @@ -2192,6 +2245,8 @@ static void musb_deassert_reset(struct work_struct *work)
> >  	musb_writeb = musb_default_writeb;
> >  	musb_readw = musb_default_readw;
> >  	musb_writew = musb_default_writew;
> > +	musb_clearb = musb_default_clearb;
> > +	musb_clearw = musb_default_clearw;
> >  
> >  	/* The musb_platform_init() call:
> >  	 *   - adjusts musb->mregs
> > @@ -2252,10 +2307,14 @@ static void musb_deassert_reset(struct work_struct *work)
> >  		musb_readb = musb->ops->readb;
> >  	if (musb->ops->writeb)
> >  		musb_writeb = musb->ops->writeb;
> > +	if (musb->ops->clearb)
> > +		musb_clearb = musb->ops->clearb;
> 	else
> 		musb_clearb = musb_readb;

Okay.

> >  	if (musb->ops->readw)
> >  		musb_readw = musb->ops->readw;
> >  	if (musb->ops->writew)
> >  		musb_writew = musb->ops->writew;
> > +	if (musb->ops->clearw)
> > +		musb_clearw = musb->ops->clearw;
> 	else
> 		musb_clearw = musb_readw;

Okay.

> >  
> >  #ifndef CONFIG_MUSB_PIO_ONLY
> >  	if (!musb->ops->dma_init || !musb->ops->dma_exit) {
> > @@ -2277,6 +2336,16 @@ static void musb_deassert_reset(struct work_struct *work)
> >  	else
> >  		musb->io.write_fifo = musb_default_write_fifo;
> >  
> > +	if (musb->ops->get_toggle)
> > +		musb->io.get_toggle = musb->ops->get_toggle;
> > +	else
> > +		musb->io.get_toggle = musb_default_get_toggle;
> > +
> > +	if (musb->ops->set_toggle)
> > +		musb->io.set_toggle = musb->ops->set_toggle;
> > +	else
> > +		musb->io.set_toggle = musb_default_set_toggle;
> > +
> >  	if (!musb->xceiv->io_ops) {
> >  		musb->xceiv->io_dev = musb->controller;
> >  		musb->xceiv->io_priv = musb->mregs;
> > diff --git a/drivers/usb/musb/musb_core.h b/drivers/usb/musb/musb_core.h
> > index 04203b7..71dca80 100644
> > --- a/drivers/usb/musb/musb_core.h
> > +++ b/drivers/usb/musb/musb_core.h
> > @@ -27,6 +27,7 @@
> >  struct musb;
> >  struct musb_hw_ep;
> >  struct musb_ep;
> > +struct musb_qh;
> >  
> >  /* Helper defines for struct musb->hwvers */
> >  #define MUSB_HWVERS_MAJOR(x)	((x >> 10) & 0x1f)
> > @@ -119,10 +120,14 @@ enum musb_g_ep0_state {
> >   * @fifo_offset: returns the fifo offset
> >   * @readb:	read 8 bits
> >   * @writeb:	write 8 bits
> > + * @clearb:	clear 8 bits,
> 
> add "could be clear-on-read or W1C" to give more info.

Okay.

> >   * @readw:	read 16 bits
> >   * @writew:	write 16 bits
> > + * @clearw:	clear 16 bits
> >   * @read_fifo:	reads the fifo
> >   * @write_fifo:	writes to fifo
> > + * @get_toggle:	platform specific get toggle function
> > + * @set_toggle:	platform specific set toggle function
> >   * @dma_init:	platform specific dma init function
> >   * @dma_exit:	platform specific dma exit function
> >   * @init:	turns on clocks, sets up platform-specific registers, etc
> > @@ -163,10 +168,14 @@ struct musb_platform_ops {
> >  	u32	(*busctl_offset)(u8 epnum, u16 offset);
> >  	u8	(*readb)(const void __iomem *addr, unsigned offset);
> >  	void	(*writeb)(void __iomem *addr, unsigned offset, u8 data);
> > +	void	(*clearb)(void __iomem *addr, unsigned int offset, u8 data);
> >  	u16	(*readw)(const void __iomem *addr, unsigned offset);
> >  	void	(*writew)(void __iomem *addr, unsigned offset, u16 data);
> > +	void	(*clearw)(void __iomem *addr, unsigned int offset, u16 data);
> >  	void	(*read_fifo)(struct musb_hw_ep *hw_ep, u16 len, u8 *buf);
> >  	void	(*write_fifo)(struct musb_hw_ep *hw_ep, u16 len, const u8 *buf);
> > +	u16	(*get_toggle)(struct musb_qh *qh, int is_in);
> > +	u16	(*set_toggle)(struct musb_qh *qh, int is_in, struct urb *urb);
> >  	struct dma_controller *
> >  		(*dma_init) (struct musb *musb, void __iomem *base);
> >  	void	(*dma_exit)(struct dma_controller *c);
> > diff --git a/drivers/usb/musb/musb_dma.h b/drivers/usb/musb/musb_dma.h
> > index 8f60271..05103ea 100644
> > --- a/drivers/usb/musb/musb_dma.h
> > +++ b/drivers/usb/musb/musb_dma.h
> > @@ -35,6 +35,12 @@
> >   *    whether shared with the Inventra core or separate.
> >   */
> >  
> > +#define MUSB_HSDMA_BASE		0x200
> > +#define MUSB_HSDMA_INTR		(MUSB_HSDMA_BASE + 0)
> > +#define MUSB_HSDMA_CONTROL		0x4
> > +#define MUSB_HSDMA_ADDRESS		0x8
> > +#define MUSB_HSDMA_COUNT		0xc
> > +
> >  #define	DMA_ADDR_INVALID	(~(dma_addr_t)0)
> >  
> >  #ifdef CONFIG_MUSB_PIO_ONLY
> > @@ -191,6 +197,9 @@ static inline void musb_dma_controller_destroy(struct dma_controller *d) { }
> >  extern struct dma_controller *
> >  musbhs_dma_controller_create(struct musb *musb, void __iomem *base);
> >  extern void musbhs_dma_controller_destroy(struct dma_controller *c);
> > +extern struct dma_controller *
> > +musbhs_dma_controller_create_noirq(struct musb *musb, void __iomem *base);
> > +extern irqreturn_t dma_controller_irq(int irq, void *private_data);
> >  
> >  extern struct dma_controller *
> >  tusb_dma_controller_create(struct musb *musb, void __iomem *base);
> > diff --git a/drivers/usb/musb/musb_host.c b/drivers/usb/musb/musb_host.c
> > index 16d0ba4..ba66f44 100644
> > --- a/drivers/usb/musb/musb_host.c
> > +++ b/drivers/usb/musb/musb_host.c
> > @@ -290,39 +290,23 @@ static void musb_giveback(struct musb *musb, struct urb *urb, int status)
> >  static inline void musb_save_toggle(struct musb_qh *qh, int is_in,
> >  				    struct urb *urb)
> >  {
> > -	void __iomem		*epio = qh->hw_ep->regs;
> > -	u16			csr;
> > +	struct musb *musb = qh->hw_ep->musb;
> > +	u16 csr;
> >  
> >  	/*
> >  	 * FIXME: the current Mentor DMA code seems to have
> >  	 * problems getting toggle correct.
> >  	 */
> > -
> > -	if (is_in)
> > -		csr = musb_readw(epio, MUSB_RXCSR) & MUSB_RXCSR_H_DATATOGGLE;
> > -	else
> > -		csr = musb_readw(epio, MUSB_TXCSR) & MUSB_TXCSR_H_DATATOGGLE;
> > -
> > +	csr = musb->io.get_toggle(qh, is_in);
> >  	usb_settoggle(urb->dev, qh->epnum, !is_in, csr ? 1 : 0);
> >  }
> >  
> >  static inline u16 musb_set_toggle(struct musb_qh *qh, int is_in,
> >  	struct urb *urb)
> >  {
> > -	u16 csr = 0;
> > -	u16 toggle = 0;
> > -
> > -	toggle = usb_gettoggle(urb->dev, qh->epnum, !is_in);
> > -
> > -	if (is_in)
> > -		csr = toggle ? (MUSB_RXCSR_H_WR_DATATOGGLE
> > -				| MUSB_RXCSR_H_DATATOGGLE) : 0;
> > -	else
> > -		csr = toggle ? (MUSB_TXCSR_H_WR_DATATOGGLE
> > -				| MUSB_TXCSR_H_DATATOGGLE)
> > -				: MUSB_TXCSR_CLRDATATOG;
> > +	struct musb *musb = qh->hw_ep->musb;
> >  
> > -	return csr;
> > +	return musb->io.set_toggle(qh, is_in, urb);
> >  }
> 
> Those two functions - musb_save_toggle() and musb_set_toggle() are very
> short now, we can get rid of them, and directly use
> musb->io.get/set_toggle().

Okay.

> >  
> >  /*
> > diff --git a/drivers/usb/musb/musb_io.h b/drivers/usb/musb/musb_io.h
> > index 8058a58..9bae09b 100644
> > --- a/drivers/usb/musb/musb_io.h
> > +++ b/drivers/usb/musb/musb_io.h
> > @@ -22,6 +22,8 @@
> >   * @read_fifo:	platform specific function to read fifo
> >   * @write_fifo:	platform specific function to write fifo
> >   * @busctl_offset: platform specific function to get busctl offset
> > + * @get_toggle: platform specific function to get toggle
> > + * @set_toggle: platform specific function to set toggle
> >   */
> >  struct musb_io {
> >  	u32	(*ep_offset)(u8 epnum, u16 offset);
> > @@ -30,13 +32,17 @@ struct musb_io {
> >  	void	(*read_fifo)(struct musb_hw_ep *hw_ep, u16 len, u8 *buf);
> >  	void	(*write_fifo)(struct musb_hw_ep *hw_ep, u16 len, const u8 *buf);
> >  	u32	(*busctl_offset)(u8 epnum, u16 offset);
> > +	u16	(*get_toggle)(struct musb_qh *qh, int is_in);
> > +	u16	(*set_toggle)(struct musb_qh *qh, int is_in, struct urb *urb);
> >  };
> >  
> >  /* Do not add new entries here, add them the struct musb_io instead */
> >  extern u8 (*musb_readb)(const void __iomem *addr, unsigned offset);
> >  extern void (*musb_writeb)(void __iomem *addr, unsigned offset, u8 data);
> > +extern void (*musb_clearb)(void __iomem *addr, unsigned int offset, u8 data);
> >  extern u16 (*musb_readw)(const void __iomem *addr, unsigned offset);
> >  extern void (*musb_writew)(void __iomem *addr, unsigned offset, u16 data);
> > +extern void (*musb_clearw)(void __iomem *addr, unsigned int offset, u16 data);
> >  extern u32 musb_readl(const void __iomem *addr, unsigned offset);
> >  extern void musb_writel(void __iomem *addr, unsigned offset, u32 data);
> >  
> > diff --git a/drivers/usb/musb/musbhsdma.c b/drivers/usb/musb/musbhsdma.c
> > index a688f7f..b05fe68 100644
> > --- a/drivers/usb/musb/musbhsdma.c
> > +++ b/drivers/usb/musb/musbhsdma.c
> > @@ -10,12 +10,7 @@
> >  #include <linux/platform_device.h>
> >  #include <linux/slab.h>
> >  #include "musb_core.h"
> > -
> > -#define MUSB_HSDMA_BASE		0x200
> > -#define MUSB_HSDMA_INTR		(MUSB_HSDMA_BASE + 0)
> > -#define MUSB_HSDMA_CONTROL		0x4
> > -#define MUSB_HSDMA_ADDRESS		0x8
> > -#define MUSB_HSDMA_COUNT		0xc
> > +#include "musb_dma.h"
> >  
> >  #define MUSB_HSDMA_CHANNEL_OFFSET(_bchannel, _offset)		\
> >  		(MUSB_HSDMA_BASE + (_bchannel << 4) + _offset)
> > @@ -268,7 +263,7 @@ static int dma_channel_abort(struct dma_channel *channel)
> >  	return 0;
> >  }
> >  
> > -static irqreturn_t dma_controller_irq(int irq, void *private_data)
> > +irqreturn_t dma_controller_irq(int irq, void *private_data)
> >  {
> >  	struct musb_dma_controller *controller = private_data;
> >  	struct musb *musb = controller->private_data;
> > @@ -291,6 +286,9 @@ static irqreturn_t dma_controller_irq(int irq, void *private_data)
> >  
> >  	int_hsdma = musb_readb(mbase, MUSB_HSDMA_INTR);
> >  
> > +	/* some platform needs clear pending interrupts by manual */
> > +	musb_clearb(musb->mregs, MUSB_HSDMA_INTR, int_hsdma);
> > +
> >  	if (!int_hsdma) {
> >  		musb_dbg(musb, "spurious DMA irq");
> >  
> > @@ -382,6 +380,7 @@ static irqreturn_t dma_controller_irq(int irq, void *private_data)
> >  	spin_unlock_irqrestore(&musb->lock, flags);
> >  	return retval;
> >  }
> > +EXPORT_SYMBOL_GPL(dma_controller_irq);
> >  
> >  void musbhs_dma_controller_destroy(struct dma_controller *c)
> >  {
> > @@ -397,18 +396,10 @@ void musbhs_dma_controller_destroy(struct dma_controller *c)
> >  }
> >  EXPORT_SYMBOL_GPL(musbhs_dma_controller_destroy);
> >  
> > -struct dma_controller *musbhs_dma_controller_create(struct musb *musb,
> > +static struct musb_dma_controller *dma_controller_alloc(struct musb *musb,
> >  						    void __iomem *base)
> >  {
> >  	struct musb_dma_controller *controller;
> > -	struct device *dev = musb->controller;
> > -	struct platform_device *pdev = to_platform_device(dev);
> > -	int irq = platform_get_irq_byname(pdev, "dma");
> > -
> > -	if (irq <= 0) {
> > -		dev_err(dev, "No DMA interrupt line!\n");
> > -		return NULL;
> > -	}
> >  
> >  	controller = kzalloc(sizeof(*controller), GFP_KERNEL);
> >  	if (!controller)
> > @@ -422,6 +413,25 @@ struct dma_controller *musbhs_dma_controller_create(struct musb *musb,
> >  	controller->controller.channel_release = dma_channel_release;
> >  	controller->controller.channel_program = dma_channel_program;
> >  	controller->controller.channel_abort = dma_channel_abort;
> > +	return controller;
> > +}
> > +
> > +struct dma_controller *musbhs_dma_controller_create(struct musb *musb,
> > +						    void __iomem *base)
> > +{
> > +	struct musb_dma_controller *controller;
> > +	struct device *dev = musb->controller;
> > +	struct platform_device *pdev = to_platform_device(dev);
> > +	int irq = platform_get_irq_byname(pdev, "dma");
> > +
> > +	if (irq <= 0) {
> > +		dev_err(dev, "No DMA interrupt line!\n");
> > +		return NULL;
> > +	}
> > +
> > +	controller = dma_controller_alloc(musb, base);
> > +	if (!controller)
> > +		return NULL;
> >  
> >  	if (request_irq(irq, dma_controller_irq, 0,
> >  			dev_name(musb->controller), &controller->controller)) {
> > @@ -436,3 +446,16 @@ struct dma_controller *musbhs_dma_controller_create(struct musb *musb,
> >  	return &controller->controller;
> >  }
> >  EXPORT_SYMBOL_GPL(musbhs_dma_controller_create);
> > +
> > +struct dma_controller *musbhs_dma_controller_create_noirq(struct musb *musb,
> > +						    void __iomem *base)
> > +{
> > +	struct musb_dma_controller *controller;
> > +
> > +	controller = dma_controller_alloc(musb, base);
> > +	if (!controller)
> > +		return NULL;
> > +
> > +	return &controller->controller;
> > +}
> > +EXPORT_SYMBOL_GPL(musbhs_dma_controller_create_noirq);
> 
> regards,
> -Bin.

Re: [PATCH v2 4/4] usb: musb: Add support for MediaTek musb controller

[Min Guo]

Hi Bin,

On Tue, 2019-01-15 at 14:38 -0600, Bin Liu wrote:
> Hi Min,
> 
> very close, thanks.
> Below I tried to explain a further cleanup in musb_clearb/w() and
> musb_get/set_toggle() implementation. Please let me know if it is not
> clear.
> 
> Basically, we don't need musb_default_clearb/w(), just assign the
> musb_io function pointers to musb_readb/w().
> 
> Then the mtk platform musb_clearb/w() calls musb_readb/w() and
> musb_writeb/w() to handle W1C.

Sorry to bother you again, I encounter a problem when prepare the patch.
The define of musb_clearb/w and musb_readb/w are difference as follow,
and cannot be directly assigned:
u8/u16 (*readb/w)(const void __iomem *addr, unsigned offset)
void (*clearb/w)(void __iomem *addr, unsigned int offset)) 

if modify clearb/w as:
u8/u16 (*clearb/w)(const void __iomem *addr, unsigned int offset)) 
then musb_clear needs writeb/w the const addr.
Can I delete const in (*readb/w)?

> regards,
> -Bin.

Re: [PATCH v2 4/4] usb: musb: Add support for MediaTek musb controller

[Bin Liu]

On Wed, Jan 16, 2019 at 05:39:02PM +0800, Min Guo wrote:
> Hi Bin,
> 
> On Tue, 2019-01-15 at 14:38 -0600, Bin Liu wrote:
> > Hi Min,
> > 
> > very close, thanks.
> > Below I tried to explain a further cleanup in musb_clearb/w() and
> > musb_get/set_toggle() implementation. Please let me know if it is not
> > clear.
> > 
> > Basically, we don't need musb_default_clearb/w(), just assign the
> > musb_io function pointers to musb_readb/w().
> > 
> > Then the mtk platform musb_clearb/w() calls musb_readb/w() and
> > musb_writeb/w() to handle W1C.
> 
> Sorry to bother you again, I encounter a problem when prepare the patch.

no problem at all.

> The define of musb_clearb/w and musb_readb/w are difference as follow,
> and cannot be directly assigned:
> u8/u16 (*readb/w)(const void __iomem *addr, unsigned offset)
> void (*clearb/w)(void __iomem *addr, unsigned int offset)) 
> 
> if modify clearb/w as:
> u8/u16 (*clearb/w)(const void __iomem *addr, unsigned int offset)) 
> then musb_clear needs writeb/w the const addr.
> Can I delete const in (*readb/w)?

yes, please create a separate patch for it, and for readl() as well,
and stating it is for implementing clearing W1C registers.

Regards,
-Bin.

Re: [PATCH v2 4/4] usb: musb: Add support for MediaTek musb controller

[Min Guo]

On Wed, 2019-01-16 at 07:59 -0600, Bin Liu wrote:
> On Wed, Jan 16, 2019 at 05:39:02PM +0800, Min Guo wrote:
> > Hi Bin,
> > 
> > On Tue, 2019-01-15 at 14:38 -0600, Bin Liu wrote:
> > > Hi Min,
> > > 
> > > very close, thanks.
> > > Below I tried to explain a further cleanup in musb_clearb/w() and
> > > musb_get/set_toggle() implementation. Please let me know if it is not
> > > clear.
> > > 
> > > Basically, we don't need musb_default_clearb/w(), just assign the
> > > musb_io function pointers to musb_readb/w().
> > > 
> > > Then the mtk platform musb_clearb/w() calls musb_readb/w() and
> > > musb_writeb/w() to handle W1C.
> > 
> > Sorry to bother you again, I encounter a problem when prepare the patch.
> 
> no problem at all.

Thanks.

> > The define of musb_clearb/w and musb_readb/w are difference as follow,
> > and cannot be directly assigned:
> > u8/u16 (*readb/w)(const void __iomem *addr, unsigned offset)
> > void (*clearb/w)(void __iomem *addr, unsigned int offset)) 
> > 
> > if modify clearb/w as:
> > u8/u16 (*clearb/w)(const void __iomem *addr, unsigned int offset)) 
> > then musb_clear needs writeb/w the const addr.
> > Can I delete const in (*readb/w)?
> 
> yes, please create a separate patch for it, and for readl() as well,
> and stating it is for implementing clearing W1C registers.

Okay.

> Regards,
> -Bin.