[UBOOT,RFC,05/13] usb: dwc3-omap: Add dwc3 glue driver for OMAP

diff --git a/drivers/usb/dwc3/Makefile b/drivers/usb/dwc3/Makefile
index fbfa0df..5533546 100644
--- a/drivers/usb/dwc3/Makefile
+++ b/drivers/usb/dwc3/Makefile
@@ -5,3 +5,5 @@  obj-$(CONFIG_USB_DWC3)			+= dwc3.o
 
 dwc3-y					:= core.o
 dwc3-$(CONFIG_USB_DWC3_GADGET)		+= gadget.o ep0.o
+
+obj-$(CONFIG_USB_DWC3_OMAP)		+= dwc3-omap.o
diff --git a/drivers/usb/dwc3/dwc3-omap.c b/drivers/usb/dwc3/dwc3-omap.c
new file mode 100644
index 0000000..ed92eec
--- /dev/null
+++ b/drivers/usb/dwc3/dwc3-omap.c
@@ -0,0 +1,447 @@ 
+/**
+ * dwc3-omap.c - OMAP Specific Glue layer
+ *
+ * Copyright (C) 2014 Texas Instruments Incorporated - http://www.ti.com
+ *
+ * Authors: Felipe Balbi <balbi@ti.com>,
+ *          Sebastian Andrzej Siewior <bigeasy@linutronix.de>
+ *
+ * Taken from Linux Kernel v3.16 (drivers/usb/dwc3/dwc3-omap.c) and ported
+ * to uboot.
+ *
+ * SPDX-License-Identifier:     GPL-2.0+
+ */
+
+#include <asm/io.h>
+#include <common.h>
+#include <errno.h>
+#include <dwc3-omap-uboot.h>
+#include <linux/usb/dwc3-omap.h>
+#include <malloc.h>
+#include <linux/compat.h>
+#include "linux-compat.h"
+
+/*
+ * All these registers belong to OMAP's Wrapper around the
+ * DesignWare USB3 Core.
+ */
+
+#define USBOTGSS_REVISION			0x0000
+#define USBOTGSS_SYSCONFIG			0x0010
+#define USBOTGSS_IRQ_EOI			0x0020
+#define USBOTGSS_EOI_OFFSET			0x0008
+#define USBOTGSS_IRQSTATUS_RAW_0		0x0024
+#define USBOTGSS_IRQSTATUS_0			0x0028
+#define USBOTGSS_IRQENABLE_SET_0		0x002c
+#define USBOTGSS_IRQENABLE_CLR_0		0x0030
+#define USBOTGSS_IRQ0_OFFSET			0x0004
+#define USBOTGSS_IRQSTATUS_RAW_1		0x0030
+#define USBOTGSS_IRQSTATUS_1			0x0034
+#define USBOTGSS_IRQENABLE_SET_1		0x0038
+#define USBOTGSS_IRQENABLE_CLR_1		0x003c
+#define USBOTGSS_IRQSTATUS_RAW_2		0x0040
+#define USBOTGSS_IRQSTATUS_2			0x0044
+#define USBOTGSS_IRQENABLE_SET_2		0x0048
+#define USBOTGSS_IRQENABLE_CLR_2		0x004c
+#define USBOTGSS_IRQSTATUS_RAW_3		0x0050
+#define USBOTGSS_IRQSTATUS_3			0x0054
+#define USBOTGSS_IRQENABLE_SET_3		0x0058
+#define USBOTGSS_IRQENABLE_CLR_3		0x005c
+#define USBOTGSS_IRQSTATUS_EOI_MISC		0x0030
+#define USBOTGSS_IRQSTATUS_RAW_MISC		0x0034
+#define USBOTGSS_IRQSTATUS_MISC			0x0038
+#define USBOTGSS_IRQENABLE_SET_MISC		0x003c
+#define USBOTGSS_IRQENABLE_CLR_MISC		0x0040
+#define USBOTGSS_IRQMISC_OFFSET			0x03fc
+#define USBOTGSS_UTMI_OTG_CTRL			0x0080
+#define USBOTGSS_UTMI_OTG_STATUS		0x0084
+#define USBOTGSS_UTMI_OTG_OFFSET		0x0480
+#define USBOTGSS_TXFIFO_DEPTH			0x0508
+#define USBOTGSS_RXFIFO_DEPTH			0x050c
+#define USBOTGSS_MMRAM_OFFSET			0x0100
+#define USBOTGSS_FLADJ				0x0104
+#define USBOTGSS_DEBUG_CFG			0x0108
+#define USBOTGSS_DEBUG_DATA			0x010c
+#define USBOTGSS_DEV_EBC_EN			0x0110
+#define USBOTGSS_DEBUG_OFFSET			0x0600
+
+/* REVISION REGISTER */
+#define USBOTGSS_REVISION_XMAJOR(reg)		((reg >> 8) & 0x7)
+#define USBOTGSS_REVISION_XMAJOR1		1
+#define USBOTGSS_REVISION_XMAJOR2		2
+/* SYSCONFIG REGISTER */
+#define USBOTGSS_SYSCONFIG_DMADISABLE		(1 << 16)
+
+/* IRQ_EOI REGISTER */
+#define USBOTGSS_IRQ_EOI_LINE_NUMBER		(1 << 0)
+
+/* IRQS0 BITS */
+#define USBOTGSS_IRQO_COREIRQ_ST		(1 << 0)
+
+/* IRQMISC BITS */
+#define USBOTGSS_IRQMISC_DMADISABLECLR		(1 << 17)
+#define USBOTGSS_IRQMISC_OEVT			(1 << 16)
+#define USBOTGSS_IRQMISC_DRVVBUS_RISE		(1 << 13)
+#define USBOTGSS_IRQMISC_CHRGVBUS_RISE		(1 << 12)
+#define USBOTGSS_IRQMISC_DISCHRGVBUS_RISE	(1 << 11)
+#define USBOTGSS_IRQMISC_IDPULLUP_RISE		(1 << 8)
+#define USBOTGSS_IRQMISC_DRVVBUS_FALL		(1 << 5)
+#define USBOTGSS_IRQMISC_CHRGVBUS_FALL		(1 << 4)
+#define USBOTGSS_IRQMISC_DISCHRGVBUS_FALL		(1 << 3)
+#define USBOTGSS_IRQMISC_IDPULLUP_FALL		(1 << 0)
+
+/* UTMI_OTG_CTRL REGISTER */
+#define USBOTGSS_UTMI_OTG_CTRL_DRVVBUS		(1 << 5)
+#define USBOTGSS_UTMI_OTG_CTRL_CHRGVBUS		(1 << 4)
+#define USBOTGSS_UTMI_OTG_CTRL_DISCHRGVBUS	(1 << 3)
+#define USBOTGSS_UTMI_OTG_CTRL_IDPULLUP		(1 << 0)
+
+/* UTMI_OTG_STATUS REGISTER */
+#define USBOTGSS_UTMI_OTG_STATUS_SW_MODE	(1 << 31)
+#define USBOTGSS_UTMI_OTG_STATUS_POWERPRESENT	(1 << 9)
+#define USBOTGSS_UTMI_OTG_STATUS_TXBITSTUFFENABLE (1 << 8)
+#define USBOTGSS_UTMI_OTG_STATUS_IDDIG		(1 << 4)
+#define USBOTGSS_UTMI_OTG_STATUS_SESSEND	(1 << 3)
+#define USBOTGSS_UTMI_OTG_STATUS_SESSVALID	(1 << 2)
+#define USBOTGSS_UTMI_OTG_STATUS_VBUSVALID	(1 << 1)
+
+static LIST_HEAD(dwc3_omap_list);
+
+struct dwc3_omap {
+	void			*dev;
+	void			*base;
+
+	u32			utmi_otg_status;
+	u32			utmi_otg_offset;
+	u32			irqmisc_offset;
+	u32			irq_eoi_offset;
+	u32			debug_offset;
+	u32			irq0_offset;
+	u32			revision;
+
+	u32			dma_status:1;
+	struct list_head	list;
+	u32			index;
+};
+
+static inline u32 dwc3_omap_readl(void __iomem *base, u32 offset)
+{
+	return readl(base + offset);
+}
+
+static inline void dwc3_omap_writel(void __iomem *base, u32 offset, u32 value)
+{
+	writel(value, base + offset);
+}
+
+static u32 dwc3_omap_read_utmi_status(struct dwc3_omap *omap)
+{
+	return dwc3_omap_readl(omap->base, USBOTGSS_UTMI_OTG_STATUS +
+							omap->utmi_otg_offset);
+}
+
+static void dwc3_omap_write_utmi_status(struct dwc3_omap *omap, u32 value)
+{
+	dwc3_omap_writel(omap->base, USBOTGSS_UTMI_OTG_STATUS +
+					omap->utmi_otg_offset, value);
+}
+
+static u32 dwc3_omap_read_irq0_status(struct dwc3_omap *omap)
+{
+	return dwc3_omap_readl(omap->base, USBOTGSS_IRQSTATUS_0 -
+						omap->irq0_offset);
+}
+
+static void dwc3_omap_write_irq0_status(struct dwc3_omap *omap, u32 value)
+{
+	dwc3_omap_writel(omap->base, USBOTGSS_IRQSTATUS_0 -
+						omap->irq0_offset, value);
+}
+
+static u32 dwc3_omap_read_irqmisc_status(struct dwc3_omap *omap)
+{
+	return dwc3_omap_readl(omap->base, USBOTGSS_IRQSTATUS_MISC +
+						omap->irqmisc_offset);
+}
+
+static void dwc3_omap_write_irqmisc_status(struct dwc3_omap *omap, u32 value)
+{
+	dwc3_omap_writel(omap->base, USBOTGSS_IRQSTATUS_MISC +
+						omap->irqmisc_offset, value);
+}
+
+static void dwc3_omap_write_irqmisc_set(struct dwc3_omap *omap, u32 value)
+{
+	dwc3_omap_writel(omap->base, USBOTGSS_IRQENABLE_SET_MISC +
+						omap->irqmisc_offset, value);
+}
+
+static void dwc3_omap_write_irq0_set(struct dwc3_omap *omap, u32 value)
+{
+	dwc3_omap_writel(omap->base, USBOTGSS_IRQENABLE_SET_0 -
+						omap->irq0_offset, value);
+}
+
+static void dwc3_omap_set_mailbox(struct dwc3_omap *omap,
+	enum omap_dwc3_vbus_id_status status)
+{
+	u32	val;
+
+	switch (status) {
+	case OMAP_DWC3_ID_GROUND:
+		dev_dbg(omap->dev, "ID GND\n");
+
+		val = dwc3_omap_read_utmi_status(omap);
+		val &= ~(USBOTGSS_UTMI_OTG_STATUS_IDDIG
+				| USBOTGSS_UTMI_OTG_STATUS_VBUSVALID
+				| USBOTGSS_UTMI_OTG_STATUS_SESSEND);
+		val |= USBOTGSS_UTMI_OTG_STATUS_SESSVALID
+				| USBOTGSS_UTMI_OTG_STATUS_POWERPRESENT;
+		dwc3_omap_write_utmi_status(omap, val);
+		break;
+
+	case OMAP_DWC3_VBUS_VALID:
+		dev_dbg(omap->dev, "VBUS Connect\n");
+
+		val = dwc3_omap_read_utmi_status(omap);
+		val &= ~USBOTGSS_UTMI_OTG_STATUS_SESSEND;
+		val |= USBOTGSS_UTMI_OTG_STATUS_IDDIG
+				| USBOTGSS_UTMI_OTG_STATUS_VBUSVALID
+				| USBOTGSS_UTMI_OTG_STATUS_SESSVALID
+				| USBOTGSS_UTMI_OTG_STATUS_POWERPRESENT;
+		dwc3_omap_write_utmi_status(omap, val);
+		break;
+
+	case OMAP_DWC3_ID_FLOAT:
+	case OMAP_DWC3_VBUS_OFF:
+		dev_dbg(omap->dev, "VBUS Disconnect\n");
+
+		val = dwc3_omap_read_utmi_status(omap);
+		val &= ~(USBOTGSS_UTMI_OTG_STATUS_SESSVALID
+				| USBOTGSS_UTMI_OTG_STATUS_VBUSVALID
+				| USBOTGSS_UTMI_OTG_STATUS_POWERPRESENT);
+		val |= USBOTGSS_UTMI_OTG_STATUS_SESSEND
+				| USBOTGSS_UTMI_OTG_STATUS_IDDIG;
+		dwc3_omap_write_utmi_status(omap, val);
+		break;
+
+	default:
+		dev_dbg(omap->dev, "invalid state\n");
+	}
+}
+
+static int dwc3_omap_interrupt(int irq, void *_omap)
+{
+	struct dwc3_omap	*omap = _omap;
+	u32			reg;
+
+	reg = dwc3_omap_read_irqmisc_status(omap);
+
+	if (reg & USBOTGSS_IRQMISC_DMADISABLECLR) {
+		dev_dbg(omap->dev, "DMA Disable was Cleared\n");
+		omap->dma_status = false;
+	}
+
+	if (reg & USBOTGSS_IRQMISC_OEVT)
+		dev_dbg(omap->dev, "OTG Event\n");
+
+	if (reg & USBOTGSS_IRQMISC_DRVVBUS_RISE)
+		dev_dbg(omap->dev, "DRVVBUS Rise\n");
+
+	if (reg & USBOTGSS_IRQMISC_CHRGVBUS_RISE)
+		dev_dbg(omap->dev, "CHRGVBUS Rise\n");
+
+	if (reg & USBOTGSS_IRQMISC_DISCHRGVBUS_RISE)
+		dev_dbg(omap->dev, "DISCHRGVBUS Rise\n");
+
+	if (reg & USBOTGSS_IRQMISC_IDPULLUP_RISE)
+		dev_dbg(omap->dev, "IDPULLUP Rise\n");
+
+	if (reg & USBOTGSS_IRQMISC_DRVVBUS_FALL)
+		dev_dbg(omap->dev, "DRVVBUS Fall\n");
+
+	if (reg & USBOTGSS_IRQMISC_CHRGVBUS_FALL)
+		dev_dbg(omap->dev, "CHRGVBUS Fall\n");
+
+	if (reg & USBOTGSS_IRQMISC_DISCHRGVBUS_FALL)
+		dev_dbg(omap->dev, "DISCHRGVBUS Fall\n");
+
+	if (reg & USBOTGSS_IRQMISC_IDPULLUP_FALL)
+		dev_dbg(omap->dev, "IDPULLUP Fall\n");
+
+	dwc3_omap_write_irqmisc_status(omap, reg);
+
+	reg = dwc3_omap_read_irq0_status(omap);
+
+	dwc3_omap_write_irq0_status(omap, reg);
+
+	return !!reg;
+}
+
+static void dwc3_omap_enable_irqs(struct dwc3_omap *omap)
+{
+	u32			reg;
+
+	/* enable all IRQs */
+	reg = USBOTGSS_IRQO_COREIRQ_ST;
+	dwc3_omap_write_irq0_set(omap, reg);
+
+	reg = (USBOTGSS_IRQMISC_OEVT |
+			USBOTGSS_IRQMISC_DRVVBUS_RISE |
+			USBOTGSS_IRQMISC_CHRGVBUS_RISE |
+			USBOTGSS_IRQMISC_DISCHRGVBUS_RISE |
+			USBOTGSS_IRQMISC_IDPULLUP_RISE |
+			USBOTGSS_IRQMISC_DRVVBUS_FALL |
+			USBOTGSS_IRQMISC_CHRGVBUS_FALL |
+			USBOTGSS_IRQMISC_DISCHRGVBUS_FALL |
+			USBOTGSS_IRQMISC_IDPULLUP_FALL);
+
+	dwc3_omap_write_irqmisc_set(omap, reg);
+}
+
+static void dwc3_omap_disable_irqs(struct dwc3_omap *omap)
+{
+	/* disable all IRQs */
+	dwc3_omap_write_irqmisc_set(omap, 0x00);
+	dwc3_omap_write_irq0_set(omap, 0x00);
+}
+
+/**
+ * dwc3_omap_uboot_init - dwc3 omap uboot initialization code
+ * @dev: struct dwc3_omap_device containing initialization data
+ *
+ * Entry point for dwc3 omap driver (equivalent to dwc3_omap_probe in linux
+ * kernel driver). Pointer to dwc3_omap_device should be passed containing
+ * base address and other initialization data. Returns '0' on success and
+ * a negative value on failure.
+ *
+ * Generally called from board_usb_init() implemented in board file.
+ */
+int dwc3_omap_uboot_init(struct dwc3_omap_device *dev)
+{
+	struct dwc3_omap	*omap;
+
+	int			utmi_mode;
+	int			x_major;
+
+	u32			reg;
+
+	omap = devm_kzalloc(NULL, sizeof(*omap), GFP_KERNEL);
+	if (!omap) {
+		dev_err(NULL, "not enough memory\n");
+		return -ENOMEM;
+	}
+
+	omap->base	= dev->base;
+	omap->index	= dev->index;
+
+	reg = dwc3_omap_readl(omap->base, USBOTGSS_REVISION);
+	omap->revision = reg;
+	x_major = USBOTGSS_REVISION_XMAJOR(reg);
+
+	/* Differentiate between OMAP5 and AM437x */
+	switch (x_major) {
+	case USBOTGSS_REVISION_XMAJOR1:
+	case USBOTGSS_REVISION_XMAJOR2:
+		omap->irq_eoi_offset = 0;
+		omap->irq0_offset = 0;
+		omap->irqmisc_offset = 0;
+		omap->utmi_otg_offset = 0;
+		omap->debug_offset = 0;
+		break;
+	default:
+		/* Default to the latest revision */
+		omap->irq_eoi_offset = USBOTGSS_EOI_OFFSET;
+		omap->irq0_offset = USBOTGSS_IRQ0_OFFSET;
+		omap->irqmisc_offset = USBOTGSS_IRQMISC_OFFSET;
+		omap->utmi_otg_offset = USBOTGSS_UTMI_OTG_OFFSET;
+		omap->debug_offset = USBOTGSS_DEBUG_OFFSET;
+		break;
+	}
+
+	/* For OMAP5(ES2.0) and AM437x x_major is 2 even though there are
+	 * changes in wrapper registers, Using dt compatible for aegis
+	*/
+
+#ifdef CONFIG_AM43XX
+	omap->irq_eoi_offset = USBOTGSS_EOI_OFFSET;
+	omap->irq0_offset = USBOTGSS_IRQ0_OFFSET;
+	omap->irqmisc_offset = USBOTGSS_IRQMISC_OFFSET;
+	omap->utmi_otg_offset = USBOTGSS_UTMI_OTG_OFFSET;
+	omap->debug_offset = USBOTGSS_DEBUG_OFFSET;
+#endif
+
+	reg = dwc3_omap_read_utmi_status(omap);
+
+	utmi_mode = dev->utmi_mode;
+
+	switch (utmi_mode) {
+	case DWC3_OMAP_UTMI_MODE_SW:
+		reg |= USBOTGSS_UTMI_OTG_STATUS_SW_MODE;
+		break;
+	case DWC3_OMAP_UTMI_MODE_HW:
+		reg &= ~USBOTGSS_UTMI_OTG_STATUS_SW_MODE;
+		break;
+	default:
+		dev_dbg(omap->dev, "UNKNOWN utmi mode %d\n", utmi_mode);
+	}
+
+	dwc3_omap_write_utmi_status(omap, reg);
+
+	/* check the DMA Status */
+	reg = dwc3_omap_readl(omap->base, USBOTGSS_SYSCONFIG);
+	omap->dma_status = !!(reg & USBOTGSS_SYSCONFIG_DMADISABLE);
+
+	dwc3_omap_enable_irqs(omap);
+
+	dwc3_omap_set_mailbox(omap, dev->vbus_id_status);
+	list_add_tail(&omap->list, &dwc3_omap_list);
+
+        return 0;
+}
+
+/**
+ * dwc3_omap_uboot_exit - dwc3 omap uboot cleanup code
+ * @index: index of this controller
+ *
+ * Performs cleanup of memory allocated in dwc3_omap_uboot_init
+ * (equivalent to dwc3_omap_remove in linux). index of _this_ controller
+ * should be passed and should match with the index passed in
+ * dwc3_omap_device during init. 
+ *
+ * Generally called from board file.
+ */
+void dwc3_omap_uboot_exit(int index)
+{
+	struct dwc3_omap *omap = NULL;
+
+	list_for_each_entry(omap, &dwc3_omap_list, list) {
+		if (omap->index != index)
+			continue;
+
+		dwc3_omap_disable_irqs(omap);
+		list_del(&omap->list);
+		kfree(omap);
+		break;
+	}
+}
+
+/**
+ * dwc3_omap_uboot_interrupt_status - check the status of interrupt
+ * @index: index of this controller
+ *
+ * Checks the status of interrupts and returns true if an interrupt
+ * is detected or false otherwise.
+ *
+ * Generally called from board file.
+ */
+int dwc3_omap_uboot_interrupt_status(int index)
+{
+	struct dwc3_omap *omap = NULL;
+
+	list_for_each_entry(omap, &dwc3_omap_list, list)
+		if (omap->index == index)
+			return dwc3_omap_interrupt(-1, omap);
+
+	return 0;
+}
diff --git a/include/dwc3-omap-uboot.h b/include/dwc3-omap-uboot.h
new file mode 100644
index 0000000..92038fb
--- /dev/null
+++ b/include/dwc3-omap-uboot.h
@@ -0,0 +1,32 @@ 
+/* include/dwc3_omap_uboot.h
+ *
+ * Copyright (c) 2014 Texas Instruments Incorporated - http://www.ti.com
+ *
+ * Designware SuperSpeed OMAP Glue uboot init
+ *
+ * SPDX-License-Identifier:     GPL-2.0+
+ */
+
+#ifndef __DWC3_OMAP_UBOOT_H_
+#define __DWC3_OMAP_UBOOT_H_
+
+#include <linux/usb/dwc3-omap.h>
+
+enum omap_dwc3_vbus_id_status {
+	OMAP_DWC3_ID_FLOAT,
+	OMAP_DWC3_ID_GROUND,
+	OMAP_DWC3_VBUS_OFF,
+	OMAP_DWC3_VBUS_VALID,
+};
+
+struct dwc3_omap_device {
+	void *base;
+	int index;
+	enum dwc3_omap_utmi_mode utmi_mode;
+	enum omap_dwc3_vbus_id_status vbus_id_status;
+};
+
+int dwc3_omap_uboot_init(struct dwc3_omap_device *dev);
+void dwc3_omap_uboot_exit(int index);
+int dwc3_omap_uboot_interrupt_status(int index);
+#endif /* __DWC3_OMAP_UBOOT_H_ */
diff --git a/include/linux/usb/dwc3-omap.h b/include/linux/usb/dwc3-omap.h
new file mode 100644
index 0000000..8bf7b55
--- /dev/null
+++ b/include/linux/usb/dwc3-omap.h
@@ -0,0 +1,19 @@ 
+/* include/linux/usb/dwc3-omap.h
+ *
+ * Copyright (c) 2014 Texas Instruments Incorporated - http://www.ti.com
+ *
+ * Designware SuperSpeed Glue
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef __DWC3_OMAP_H_
+#define __DWC3_OMAP_H_
+
+enum dwc3_omap_utmi_mode {
+	DWC3_OMAP_UTMI_MODE_UNKNOWN = 0,
+	DWC3_OMAP_UTMI_MODE_HW,
+	DWC3_OMAP_UTMI_MODE_SW,
+};
+
+#endif /* __DWC3_OMAP_H_ */