Re: [PATCH v2 4/4] usb: musb: Add support for MediaTek musb controller | linux-arm-kernel

quoted

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 <redacted>

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 <redacted>
Signed-off-by: Yonglong Wu <redacted>
---
 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 [off-list ref]");
+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.


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