[U-Boot] [PATCH v9 5/5] usb: gadget: add Faraday FOTG210 USB gadget support

[Kuo-Jung Su]

From: Kuo-Jung Su <dantesu at faraday-tech.com>

The Faraday FOTG210 is an OTG chip which could operate
as either an EHCI Host or a USB Device at a time.

Signed-off-by: Kuo-Jung Su <dantesu at faraday-tech.com>
CC: Marek Vasut <marex at denx.de>
---
Changes for v9:
   - Nothing updates

Changes for v8:
   - Nothing updates

Changes for v7:
   - Nothing updates

Changes for v6:
   - Nothing updates

Changes for v5:
   - Coding Style cleanup.
   - Drop postfix '__iomem' from struct fotg210_regs
   - Use permanent delay for hardware reset
   - Drop '#ifndef CONFIG_SYS_DCACHE_OFF'
   - Drop magic numbers

Changes for v4:
   - Use only macro constants and named bit/mask
   - Remove dcache_enable() from usb_gadget_register_driver()

Changes for v3:
   - Coding Style cleanup.
   - Drop bit fields from c struct.
   - Drop macros for wirtel()/readl(), call them directly.
   - Always insert a blank line between declarations and code.
   - Replace all the infinite wait loop with a timeout.
   - Add '__iomem' to all the declaration of HW register pointers.

Changes for v2:
   - Coding Style cleanup.
   - Use readl(), writel(), clrsetbits_le32() to replace REG() macros.
   - Use structure based hardware registers to replace the macro constants.
   - Replace BIT() with BIT_MASK().
   - echi-faraday: Remove debug codes.

 drivers/usb/gadget/Makefile       |    1 +
 drivers/usb/gadget/fotg210.c      |  948 +++++++++++++++++++++++++++++++++++++
 drivers/usb/gadget/gadget_chips.h |    8 +
 3 files changed, 957 insertions(+)
 create mode 100644 drivers/usb/gadget/fotg210.c

diff --git a/drivers/usb/gadget/Makefile b/drivers/usb/gadget/Makefile
index e545b6b..432cf17 100644
--- a/drivers/usb/gadget/Makefile
+++ b/drivers/usb/gadget/Makefile
@@ -35,6 +35,7 @@ endif
 # new USB gadget layer dependencies
 ifdef CONFIG_USB_GADGET
 COBJS-$(CONFIG_USB_GADGET_S3C_UDC_OTG) += s3c_udc_otg.o
+COBJS-$(CONFIG_USB_GADGET_FOTG210) += fotg210.o
 COBJS-$(CONFIG_USBDOWNLOAD_GADGET) += g_dnl.o
 COBJS-$(CONFIG_DFU_FUNCTION) += f_dfu.o
 endif
diff --git a/drivers/usb/gadget/fotg210.c b/drivers/usb/gadget/fotg210.c
new file mode 100644
index 0000000..d003331
--- /dev/null
+++ b/drivers/usb/gadget/fotg210.c
@@ -0,0 +1,948 @@
+/*
+ * Faraday USB 2.0 OTG Controller
+ *
+ * (C) Copyright 2010 Faraday Technology
+ * Dante Su <dantesu at faraday-tech.com>
+ *
+ * This file is released under the terms of GPL v2 and any later version.
+ * See the file COPYING in the root directory of the source tree for details.
+ */
+
+#include <common.h>
+#include <command.h>
+#include <config.h>
+#include <net.h>
+#include <malloc.h>
+#include <asm/io.h>
+#include <asm/errno.h>
+#include <linux/types.h>
+#include <linux/usb/ch9.h>
+#include <linux/usb/gadget.h>
+
+#include <usb/fotg210.h>
+
+#define CFG_NUM_ENDPOINTS		4
+#define CFG_EP0_MAX_PACKET_SIZE	64
+#define CFG_EPX_MAX_PACKET_SIZE	512
+
+#define CFG_CMD_TIMEOUT (CONFIG_SYS_HZ >> 2) /* 250 ms */
+
+struct fotg210_chip;
+
+struct fotg210_ep {
+	struct usb_ep ep;
+
+	uint maxpacket;
+	uint id;
+	uint stopped;
+
+	struct list_head                      queue;
+	struct fotg210_chip                  *chip;
+	const struct usb_endpoint_descriptor *desc;
+};
+
+struct fotg210_request {
+	struct usb_request req;
+	struct list_head   queue;
+	struct fotg210_ep *ep;
+};
+
+struct fotg210_chip {
+	struct usb_gadget         gadget;
+	struct usb_gadget_driver *driver;
+	struct fotg210_regs      *regs;
+	uint8_t                   irq;
+	uint16_t                  addr;
+	int                       pullup;
+	enum usb_device_state     state;
+	struct fotg210_ep         ep[1 + CFG_NUM_ENDPOINTS];
+};
+
+static struct usb_endpoint_descriptor ep0_desc = {
+	.bLength = sizeof(struct usb_endpoint_descriptor),
+	.bDescriptorType = USB_DT_ENDPOINT,
+	.bEndpointAddress = USB_DIR_IN,
+	.bmAttributes = USB_ENDPOINT_XFER_CONTROL,
+};
+
+static inline int fifo_to_ep(struct fotg210_chip *chip, int id, int in)
+{
+	return (id < 0) ? 0 : ((id & 0x03) + 1);
+}
+
+static inline int ep_to_fifo(struct fotg210_chip *chip, int id)
+{
+	return (id <= 0) ? -1 : ((id - 1) & 0x03);
+}
+
+static inline int ep_reset(struct fotg210_chip *chip, uint8_t ep_addr)
+{
+	int ep = ep_addr & USB_ENDPOINT_NUMBER_MASK;
+	struct fotg210_regs *regs = chip->regs;
+
+	if (ep_addr & USB_DIR_IN) {
+		/* reset endpoint */
+		setbits_le32(&regs->iep[ep - 1], IEP_RESET);
+		mdelay(1);
+		clrbits_le32(&regs->iep[ep - 1], IEP_RESET);
+		/* clear endpoint stall */
+		clrbits_le32(&regs->iep[ep - 1], IEP_STALL);
+	} else {
+		/* reset endpoint */
+		setbits_le32(&regs->oep[ep - 1], OEP_RESET);
+		mdelay(1);
+		clrbits_le32(&regs->oep[ep - 1], OEP_RESET);
+		/* clear endpoint stall */
+		clrbits_le32(&regs->oep[ep - 1], OEP_STALL);
+	}
+
+	return 0;
+}
+
+static int fotg210_reset(struct fotg210_chip *chip)
+{
+	struct fotg210_regs *regs = chip->regs;
+	uint32_t i;
+
+	chip->state = USB_STATE_POWERED;
+
+	/* chip enable */
+	writel(DEVCTRL_EN, &regs->dev_ctrl);
+
+	/* device address reset */
+	chip->addr = 0;
+	writel(0, &regs->dev_addr);
+
+	/* set idle counter to 7ms */
+	writel(7, &regs->idle);
+
+	/* disable all interrupts */
+	writel(IMR_MASK, &regs->imr);
+	writel(GIMR_MASK, &regs->gimr);
+	writel(GIMR0_MASK, &regs->gimr0);
+	writel(GIMR1_MASK, &regs->gimr1);
+	writel(GIMR2_MASK, &regs->gimr2);
+
+	/* clear interrupts */
+	writel(ISR_MASK, &regs->isr);
+	writel(0, &regs->gisr);
+	writel(0, &regs->gisr0);
+	writel(0, &regs->gisr1);
+	writel(0, &regs->gisr2);
+
+	/* chip reset */
+	setbits_le32(&regs->dev_ctrl, DEVCTRL_RESET);
+	mdelay(10);
+	if (readl(&regs->dev_ctrl) & DEVCTRL_RESET) {
+		printf("fotg210: chip reset failed\n");
+		return -1;
+	}
+
+	/* CX FIFO reset */
+	setbits_le32(&regs->cxfifo, CXFIFO_CXFIFOCLR);
+	mdelay(10);
+	if (readl(&regs->cxfifo) & CXFIFO_CXFIFOCLR) {
+		printf("fotg210: ep0 fifo reset failed\n");
+		return -1;
+	}
+
+	/* create static ep-fifo map (EP1 <-> FIFO0, EP2 <-> FIFO1 ...) */
+	writel(EPMAP14_DEFAULT, &regs->epmap14);
+	writel(EPMAP58_DEFAULT, &regs->epmap58);
+	writel(FIFOMAP_DEFAULT, &regs->fifomap);
+	writel(0, &regs->fifocfg);
+	for (i = 0; i < 8; ++i) {
+		writel(CFG_EPX_MAX_PACKET_SIZE, &regs->iep[i]);
+		writel(CFG_EPX_MAX_PACKET_SIZE, &regs->oep[i]);
+	}
+
+	/* FIFO reset */
+	for (i = 0; i < 4; ++i) {
+		writel(FIFOCSR_RESET, &regs->fifocsr[i]);
+		mdelay(10);
+		if (readl(&regs->fifocsr[i]) & FIFOCSR_RESET) {
+			printf("fotg210: fifo%d reset failed\n", i);
+			return -1;
+		}
+	}
+
+	/* enable only device interrupt and triggered at level-high */
+	writel(IMR_IRQLH | IMR_HOST | IMR_OTG, &regs->imr);
+	writel(ISR_MASK, &regs->isr);
+	/* disable EP0 IN/OUT interrupt */
+	writel(GIMR0_CXOUT | GIMR0_CXIN, &regs->gimr0);
+	/* disable EPX IN+SPK+OUT interrupts */
+	writel(GIMR1_MASK, &regs->gimr1);
+	/* disable wakeup+idle+dma+zlp interrupts */
+	writel(GIMR2_WAKEUP | GIMR2_IDLE | GIMR2_DMAERR | GIMR2_DMAFIN
+		| GIMR2_ZLPRX | GIMR2_ZLPTX, &regs->gimr2);
+	/* enable all group interrupt */
+	writel(0, &regs->gimr);
+
+	/* suspend delay = 3 ms */
+	writel(3, &regs->idle);
+
+	/* turn-on device interrupts */
+	setbits_le32(&regs->dev_ctrl, DEVCTRL_GIRQ_EN);
+
+	return 0;
+}
+
+static inline int fotg210_cxwait(struct fotg210_chip *chip, uint32_t mask)
+{
+	struct fotg210_regs *regs = chip->regs;
+	int ret = -1;
+	ulong ts;
+
+	for (ts = get_timer(0); get_timer(ts) < CFG_CMD_TIMEOUT; ) {
+		if ((readl(&regs->cxfifo) & mask) != mask)
+			continue;
+		ret = 0;
+		break;
+	}
+
+	if (ret)
+		printf("fotg210: cx/ep0 timeout\n");
+
+	return ret;
+}
+
+static int fotg210_dma(struct fotg210_ep *ep, struct fotg210_request *req)
+{
+	struct fotg210_chip *chip = ep->chip;
+	struct fotg210_regs *regs = chip->regs;
+	uint32_t tmp, ts;
+	uint8_t *buf  = req->req.buf + req->req.actual;
+	uint32_t len  = req->req.length - req->req.actual;
+	int fifo = ep_to_fifo(chip, ep->id);
+	int ret = -EBUSY;
+
+	/* 1. init dma buffer */
+	if (len > ep->maxpacket)
+		len = ep->maxpacket;
+
+	/* 2. wait for dma ready (hardware) */
+	for (ts = get_timer(0); get_timer(ts) < CFG_CMD_TIMEOUT; ) {
+		if (!(readl(&regs->dma_ctrl) & DMACTRL_START)) {
+			ret = 0;
+			break;
+		}
+	}
+	if (ret) {
+		printf("fotg210: dma busy\n");
+		req->req.status = ret;
+		return ret;
+	}
+
+	/* 3. DMA target setup */
+	if (ep->desc->bEndpointAddress & USB_DIR_IN)
+		flush_dcache_range((ulong)buf, (ulong)buf + len);
+	else
+		invalidate_dcache_range((ulong)buf, (ulong)buf + len);
+
+	writel(virt_to_phys(buf), &regs->dma_addr);
+
+	if (ep->desc->bEndpointAddress & USB_DIR_IN) {
+		if (ep->id == 0) {
+			/* Wait until cx/ep0 fifo empty */
+			fotg210_cxwait(chip, CXFIFO_CXFIFOE);
+			writel(DMAFIFO_CX, &regs->dma_fifo);
+		} else {
+			/* Wait until epx fifo empty */
+			fotg210_cxwait(chip, CXFIFO_FIFOE(fifo));
+			writel(DMAFIFO_FIFO(fifo), &regs->dma_fifo);
+		}
+		writel(DMACTRL_LEN(len) | DMACTRL_MEM2FIFO, &regs->dma_ctrl);
+	} else {
+		uint32_t blen;
+
+		if (ep->id == 0) {
+			writel(DMAFIFO_CX, &regs->dma_fifo);
+			do {
+				blen = CXFIFO_BYTES(readl(&regs->cxfifo));
+			} while (blen < len);
+		} else {
+			writel(DMAFIFO_FIFO(fifo), &regs->dma_fifo);
+			blen = FIFOCSR_BYTES(readl(&regs->fifocsr[fifo]));
+		}
+		len  = (len < blen) ? len : blen;
+		writel(DMACTRL_LEN(len) | DMACTRL_FIFO2MEM, &regs->dma_ctrl);
+	}
+
+	/* 4. DMA start */
+	setbits_le32(&regs->dma_ctrl, DMACTRL_START);
+
+	/* 5. DMA wait */
+	ret = -EBUSY;
+	for (ts = get_timer(0); get_timer(ts) < CFG_CMD_TIMEOUT; ) {
+		tmp = readl(&regs->gisr2);
+		/* DMA complete */
+		if (tmp & GISR2_DMAFIN) {
+			ret = 0;
+			break;
+		}
+		/* DMA error */
+		if (tmp & GISR2_DMAERR) {
+			printf("fotg210: dma error\n");
+			break;
+		}
+		/* resume, suspend, reset */
+		if (tmp & (GISR2_RESUME | GISR2_SUSPEND | GISR2_RESET)) {
+			printf("fotg210: dma reset by host\n");
+			break;
+		}
+	}
+
+	/* 7. DMA target reset */
+	if (ret)
+		writel(DMACTRL_ABORT | DMACTRL_CLRFF, &regs->dma_ctrl);
+
+	writel(0, &regs->gisr2);
+	writel(0, &regs->dma_fifo);
+
+	req->req.status = ret;
+	if (!ret)
+		req->req.actual += len;
+	else
+		printf("fotg210: ep%d dma error(code=%d)\n", ep->id, ret);
+
+	return len;
+}
+
+/*
+ * result of setup packet
+ */
+#define CX_IDLE		0
+#define CX_FINISH	1
+#define CX_STALL	2
+
+static void fotg210_setup(struct fotg210_chip *chip)
+{
+	int id, ret = CX_IDLE;
+	uint32_t tmp[2];
+	struct usb_ctrlrequest *req = (struct usb_ctrlrequest *)tmp;
+	struct fotg210_regs *regs = chip->regs;
+
+	/*
+	 * If this is the first Cx 8 byte command,
+	 * we can now query USB mode (high/full speed; USB 2.0/USB 1.0)
+	 */
+	if (chip->state == USB_STATE_POWERED) {
+		chip->state = USB_STATE_DEFAULT;
+		if (readl(&regs->otgcsr) & OTGCSR_DEV_B) {
+			/* Mini-B */
+			if (readl(&regs->dev_ctrl) & DEVCTRL_HS) {
+				puts("fotg210: HS\n");
+				chip->gadget.speed = USB_SPEED_HIGH;
+				/* SOF mask timer = 1100 ticks */
+				writel(SOFMTR_TMR(1100), &regs->sof_mtr);
+			} else {
+				puts("fotg210: FS\n");
+				chip->gadget.speed = USB_SPEED_FULL;
+				/* SOF mask timer = 10000 ticks */
+				writel(SOFMTR_TMR(10000), &regs->sof_mtr);
+			}
+		} else {
+			printf("fotg210: mini-A?\n");
+		}
+	}
+
+	/* switch data port to ep0 */
+	writel(DMAFIFO_CX, &regs->dma_fifo);
+	/* fetch 8 bytes setup packet */
+	tmp[0] = readl(&regs->ep0_data);
+	tmp[1] = readl(&regs->ep0_data);
+	/* release data port */
+	writel(0, &regs->dma_fifo);
+
+	if (req->bRequestType & USB_DIR_IN)
+		ep0_desc.bEndpointAddress = USB_DIR_IN;
+	else
+		ep0_desc.bEndpointAddress = USB_DIR_OUT;
+
+	ret = CX_IDLE;
+
+	if ((req->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD) {
+		switch (req->bRequest) {
+		case USB_REQ_SET_CONFIGURATION:
+			debug("fotg210: set_cfg(%d)\n", req->wValue & 0x00FF);
+			if (!(req->wValue & 0x00FF)) {
+				chip->state = USB_STATE_ADDRESS;
+				writel(chip->addr, &regs->dev_addr);
+			} else {
+				chip->state = USB_STATE_CONFIGURED;
+				writel(chip->addr | DEVADDR_CONF,
+					&regs->dev_addr);
+			}
+			ret = CX_IDLE;
+			break;
+
+		case USB_REQ_SET_ADDRESS:
+			debug("fotg210: set_addr(0x%04X)\n", req->wValue);
+			chip->state = USB_STATE_ADDRESS;
+			chip->addr  = req->wValue & DEVADDR_ADDR_MASK;
+			ret = CX_FINISH;
+			writel(chip->addr, &regs->dev_addr);
+			break;
+
+		case USB_REQ_CLEAR_FEATURE:
+			debug("fotg210: clr_feature(%d, %d)\n",
+				req->bRequestType & 0x03, req->wValue);
+			switch (req->wValue) {
+			case 0:    /* [Endpoint] halt */
+				ep_reset(chip, req->wIndex);
+				ret = CX_FINISH;
+				break;
+			case 1:    /* [Device] remote wake-up */
+			case 2:    /* [Device] test mode */
+			default:
+				ret = CX_STALL;
+				break;
+			}
+			break;
+
+		case USB_REQ_SET_FEATURE:
+			debug("fotg210: set_feature(%d, %d)\n",
+				req->wValue, req->wIndex & 0xf);
+			switch (req->wValue) {
+			case 0:    /* Endpoint Halt */
+				id = req->wIndex & 0xf;
+				setbits_le32(&regs->iep[id - 1], IEP_STALL);
+				setbits_le32(&regs->oep[id - 1], OEP_STALL);
+				ret = CX_FINISH;
+				break;
+			case 1:    /* Remote Wakeup */
+			case 2:    /* Test Mode */
+			default:
+				ret = CX_STALL;
+				break;
+			}
+			break;
+
+		case USB_REQ_GET_STATUS:
+			debug("fotg210: get_status\n");
+			ret = CX_STALL;
+			break;
+
+		case USB_REQ_SET_DESCRIPTOR:
+			debug("fotg210: set_descriptor\n");
+			ret = CX_STALL;
+			break;
+
+		case USB_REQ_SYNCH_FRAME:
+			debug("fotg210: sync frame\n");
+			ret = CX_STALL;
+			break;
+		}
+	} /* if ((req->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD) */
+
+	if (ret == CX_IDLE && chip->driver->setup) {
+		if (chip->driver->setup(&chip->gadget, req) < 0)
+			ret = CX_STALL;
+		else
+			ret = CX_FINISH;
+	}
+
+	switch (ret) {
+	case CX_FINISH:
+		setbits_le32(&regs->cxfifo, CXFIFO_CXFIN);
+		break;
+
+	case CX_STALL:
+		setbits_le32(&regs->cxfifo, CXFIFO_CXSTALL | CXFIFO_CXFIN);
+		printf("fotg210: cx_stall!\n");
+		break;
+
+	case CX_IDLE:
+		debug("fotg210: cx_idle?\n");
+	default:
+		break;
+	}
+}
+
+/*
+ * fifo - FIFO id
+ * zlp  - zero length packet
+ */
+static void fotg210_recv(struct fotg210_chip *chip, int ep_id)
+{
+	struct fotg210_regs *regs = chip->regs;
+	struct fotg210_ep *ep = chip->ep + ep_id;
+	struct fotg210_request *req;
+	int len;
+
+	if (ep->stopped || (ep->desc->bEndpointAddress & USB_DIR_IN)) {
+		printf("fotg210: ep%d recv, invalid!\n", ep->id);
+		return;
+	}
+
+	if (list_empty(&ep->queue)) {
+		printf("fotg210: ep%d recv, drop!\n", ep->id);
+		return;
+	}
+
+	req = list_first_entry(&ep->queue, struct fotg210_request, queue);
+	len = fotg210_dma(ep, req);
+	if (len < ep->ep.maxpacket || req->req.length <= req->req.actual) {
+		list_del_init(&req->queue);
+		if (req->req.complete)
+			req->req.complete(&ep->ep, &req->req);
+	}
+
+	if (ep->id > 0 && list_empty(&ep->queue)) {
+		setbits_le32(&regs->gimr1,
+			GIMR1_FIFO_RX(ep_to_fifo(chip, ep->id)));
+	}
+}
+
+/*
+ * USB Gadget Layer
+ */
+static int fotg210_ep_enable(
+	struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
+{
+	struct fotg210_ep *ep = container_of(_ep, struct fotg210_ep, ep);
+	struct fotg210_chip *chip = ep->chip;
+	struct fotg210_regs *regs = chip->regs;
+	int id = ep_to_fifo(chip, ep->id);
+	int in = (desc->bEndpointAddress & USB_DIR_IN) ? 1 : 0;
+
+	if (!_ep || !desc
+		|| desc->bDescriptorType != USB_DT_ENDPOINT
+		|| le16_to_cpu(desc->wMaxPacketSize) == 0) {
+		printf("fotg210: bad ep or descriptor\n");
+		return -EINVAL;
+	}
+
+	ep->desc = desc;
+	ep->stopped = 0;
+
+	if (in)
+		setbits_le32(&regs->fifomap, FIFOMAP(id, FIFOMAP_IN));
+
+	switch (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
+	case USB_ENDPOINT_XFER_CONTROL:
+		return -EINVAL;
+
+	case USB_ENDPOINT_XFER_ISOC:
+		setbits_le32(&regs->fifocfg,
+			FIFOCFG(id, FIFOCFG_EN | FIFOCFG_ISOC));
+		break;
+
+	case USB_ENDPOINT_XFER_BULK:
+		setbits_le32(&regs->fifocfg,
+			FIFOCFG(id, FIFOCFG_EN | FIFOCFG_BULK));
+		break;
+
+	case USB_ENDPOINT_XFER_INT:
+		setbits_le32(&regs->fifocfg,
+			FIFOCFG(id, FIFOCFG_EN | FIFOCFG_INTR));
+		break;
+	}
+
+	return 0;
+}
+
+static int fotg210_ep_disable(struct usb_ep *_ep)
+{
+	struct fotg210_ep *ep = container_of(_ep, struct fotg210_ep, ep);
+	struct fotg210_chip *chip = ep->chip;
+	struct fotg210_regs *regs = chip->regs;
+	int id = ep_to_fifo(chip, ep->id);
+
+	ep->desc = NULL;
+	ep->stopped = 1;
+
+	clrbits_le32(&regs->fifocfg, FIFOCFG(id, FIFOCFG_CFG_MASK));
+	clrbits_le32(&regs->fifomap, FIFOMAP(id, FIFOMAP_DIR_MASK));
+
+	return 0;
+}
+
+static struct usb_request *fotg210_ep_alloc_request(
+	struct usb_ep *_ep, gfp_t gfp_flags)
+{
+	struct fotg210_request *req = malloc(sizeof(*req));
+
+	if (req) {
+		memset(req, 0, sizeof(*req));
+		INIT_LIST_HEAD(&req->queue);
+	}
+	return &req->req;
+}
+
+static void fotg210_ep_free_request(
+	struct usb_ep *_ep, struct usb_request *_req)
+{
+	struct fotg210_request *req;
+
+	req = container_of(_req, struct fotg210_request, req);
+	free(req);
+}
+
+static int fotg210_ep_queue(
+	struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
+{
+	struct fotg210_ep *ep = container_of(_ep, struct fotg210_ep, ep);
+	struct fotg210_chip *chip = ep->chip;
+	struct fotg210_regs *regs = chip->regs;
+	struct fotg210_request *req;
+
+	req = container_of(_req, struct fotg210_request, req);
+	if (!_req || !_req->complete || !_req->buf
+		|| !list_empty(&req->queue)) {
+		printf("fotg210: invalid request to ep%d\n", ep->id);
+		return -EINVAL;
+	}
+
+	if (!chip || chip->state == USB_STATE_SUSPENDED) {
+		printf("fotg210: request while chip suspended\n");
+		return -EINVAL;
+	}
+
+	req->req.actual = 0;
+	req->req.status = -EINPROGRESS;
+
+	if (req->req.length == 0) {
+		req->req.status = 0;
+		if (req->req.complete)
+			req->req.complete(&ep->ep, &req->req);
+		return 0;
+	}
+
+	if (ep->id == 0) {
+		do {
+			int len = fotg210_dma(ep, req);
+			if (len < ep->ep.maxpacket)
+				break;
+			if (ep->desc->bEndpointAddress & USB_DIR_IN)
+				udelay(100);
+		} while (req->req.length > req->req.actual);
+	} else {
+		if (ep->desc->bEndpointAddress & USB_DIR_IN) {
+			do {
+				int len = fotg210_dma(ep, req);
+				if (len < ep->ep.maxpacket)
+					break;
+			} while (req->req.length > req->req.actual);
+		} else {
+			list_add_tail(&req->queue, &ep->queue);
+			clrbits_le32(&regs->gimr1,
+				GIMR1_FIFO_RX(ep_to_fifo(chip, ep->id)));
+		}
+	}
+
+	if (ep->id == 0 || (ep->desc->bEndpointAddress & USB_DIR_IN)) {
+		if (req->req.complete)
+			req->req.complete(&ep->ep, &req->req);
+	}
+
+	return 0;
+}
+
+static int fotg210_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
+{
+	struct fotg210_ep *ep = container_of(_ep, struct fotg210_ep, ep);
+	struct fotg210_request *req;
+
+	/* make sure it's actually queued on this endpoint */
+	list_for_each_entry(req, &ep->queue, queue) {
+		if (&req->req == _req)
+			break;
+	}
+	if (&req->req != _req)
+		return -EINVAL;
+
+	/* remove the request */
+	list_del_init(&req->queue);
+
+	/* update status & invoke complete callback */
+	if (req->req.status == -EINPROGRESS) {
+		req->req.status = -ECONNRESET;
+		if (req->req.complete)
+			req->req.complete(_ep, &req->req);
+	}
+
+	return 0;
+}
+
+static int fotg210_ep_halt(struct usb_ep *_ep, int halt)
+{
+	struct fotg210_ep *ep = container_of(_ep, struct fotg210_ep, ep);
+	struct fotg210_chip *chip = ep->chip;
+	struct fotg210_regs *regs = chip->regs;
+	int ret = -1;
+
+	debug("fotg210: ep%d halt=%d\n", ep->id, halt);
+
+	/* Endpoint STALL */
+	if (ep->id > 0 && ep->id <= CFG_NUM_ENDPOINTS) {
+		if (halt) {
+			/* wait until all ep fifo empty */
+			fotg210_cxwait(chip, 0xf00);
+			/* stall */
+			if (ep->desc->bEndpointAddress & USB_DIR_IN) {
+				setbits_le32(&regs->iep[ep->id - 1],
+					IEP_STALL);
+			} else {
+				setbits_le32(&regs->oep[ep->id - 1],
+					OEP_STALL);
+			}
+		} else {
+			if (ep->desc->bEndpointAddress & USB_DIR_IN) {
+				clrbits_le32(&regs->iep[ep->id - 1],
+					IEP_STALL);
+			} else {
+				clrbits_le32(&regs->oep[ep->id - 1],
+					OEP_STALL);
+			}
+		}
+		ret = 0;
+	}
+
+	return ret;
+}
+
+/*
+ * activate/deactivate link with host.
+ */
+static void pullup(struct fotg210_chip *chip, int is_on)
+{
+	struct fotg210_regs *regs = chip->regs;
+
+	if (is_on) {
+		if (!chip->pullup) {
+			chip->state = USB_STATE_POWERED;
+			chip->pullup = 1;
+			/* enable the chip */
+			setbits_le32(&regs->dev_ctrl, DEVCTRL_EN);
+			/* clear unplug bit (BIT0) */
+			clrbits_le32(&regs->phy_tmsr, PHYTMSR_UNPLUG);
+		}
+	} else {
+		chip->state = USB_STATE_NOTATTACHED;
+		chip->pullup = 0;
+		chip->addr = 0;
+		writel(chip->addr, &regs->dev_addr);
+		/* set unplug bit (BIT0) */
+		setbits_le32(&regs->phy_tmsr, PHYTMSR_UNPLUG);
+		/* disable the chip */
+		clrbits_le32(&regs->dev_ctrl, DEVCTRL_EN);
+	}
+}
+
+static int fotg210_pullup(struct usb_gadget *_gadget, int is_on)
+{
+	struct fotg210_chip *chip;
+
+	chip = container_of(_gadget, struct fotg210_chip, gadget);
+
+	debug("fotg210: pullup=%d\n", is_on);
+
+	pullup(chip, is_on);
+
+	return 0;
+}
+
+static int fotg210_get_frame(struct usb_gadget *_gadget)
+{
+	struct fotg210_chip *chip;
+	struct fotg210_regs *regs;
+
+	chip = container_of(_gadget, struct fotg210_chip, gadget);
+	regs = chip->regs;
+
+	return SOFFNR_FNR(readl(&regs->sof_fnr));
+}
+
+static struct usb_gadget_ops fotg210_gadget_ops = {
+	.get_frame = fotg210_get_frame,
+	.pullup = fotg210_pullup,
+};
+
+static struct usb_ep_ops fotg210_ep_ops = {
+	.enable         = fotg210_ep_enable,
+	.disable        = fotg210_ep_disable,
+	.queue          = fotg210_ep_queue,
+	.dequeue        = fotg210_ep_dequeue,
+	.set_halt       = fotg210_ep_halt,
+	.alloc_request  = fotg210_ep_alloc_request,
+	.free_request   = fotg210_ep_free_request,
+};
+
+static struct fotg210_chip controller = {
+	.regs = (void __iomem *)CONFIG_FOTG210_BASE,
+	.gadget = {
+		.name = "fotg210_udc",
+		.ops = &fotg210_gadget_ops,
+		.ep0 = &controller.ep[0].ep,
+		.speed = USB_SPEED_UNKNOWN,
+		.is_dualspeed = 1,
+		.is_otg = 0,
+		.is_a_peripheral = 0,
+		.b_hnp_enable = 0,
+		.a_hnp_support = 0,
+		.a_alt_hnp_support = 0,
+	},
+	.ep[0] = {
+		.id = 0,
+		.ep = {
+			.name  = "ep0",
+			.ops   = &fotg210_ep_ops,
+		},
+		.desc      = &ep0_desc,
+		.chip      = &controller,
+		.maxpacket = CFG_EP0_MAX_PACKET_SIZE,
+	},
+	.ep[1] = {
+		.id = 1,
+		.ep = {
+			.name  = "ep1",
+			.ops   = &fotg210_ep_ops,
+		},
+		.chip      = &controller,
+		.maxpacket = CFG_EPX_MAX_PACKET_SIZE,
+	},
+	.ep[2] = {
+		.id = 2,
+		.ep = {
+			.name  = "ep2",
+			.ops   = &fotg210_ep_ops,
+		},
+		.chip      = &controller,
+		.maxpacket = CFG_EPX_MAX_PACKET_SIZE,
+	},
+	.ep[3] = {
+		.id = 3,
+		.ep = {
+			.name  = "ep3",
+			.ops   = &fotg210_ep_ops,
+		},
+		.chip      = &controller,
+		.maxpacket = CFG_EPX_MAX_PACKET_SIZE,
+	},
+	.ep[4] = {
+		.id = 4,
+		.ep = {
+			.name  = "ep4",
+			.ops   = &fotg210_ep_ops,
+		},
+		.chip      = &controller,
+		.maxpacket = CFG_EPX_MAX_PACKET_SIZE,
+	},
+};
+
+int usb_gadget_handle_interrupts(void)
+{
+	struct fotg210_chip *chip = &controller;
+	struct fotg210_regs *regs = chip->regs;
+	uint32_t id, st, isr, gisr;
+
+	isr  = readl(&regs->isr) & (~readl(&regs->imr));
+	gisr = readl(&regs->gisr) & (~readl(&regs->gimr));
+	if (!(isr & ISR_DEV) || !gisr)
+		return 0;
+
+	writel(ISR_DEV, &regs->isr);
+
+	/* CX interrupts */
+	if (gisr & GISR_GRP0) {
+		st = readl(&regs->gisr0);
+		writel(0, &regs->gisr0);
+
+		if (st & GISR0_CXERR)
+			printf("fotg210: cmd error\n");
+
+		if (st & GISR0_CXABORT)
+			printf("fotg210: cmd abort\n");
+
+		if (st & GISR0_CXSETUP)    /* setup */
+			fotg210_setup(chip);
+		else if (st & GISR0_CXEND) /* command finish */
+			setbits_le32(&regs->cxfifo, CXFIFO_CXFIN);
+	}
+
+	/* FIFO interrupts */
+	if (gisr & GISR_GRP1) {
+		st = readl(&regs->gisr1);
+		for (id = 0; id < 4; ++id) {
+			if (st & GISR1_RX_FIFO(id))
+				fotg210_recv(chip, fifo_to_ep(chip, id, 0));
+		}
+	}
+
+	/* Device Status Interrupts */
+	if (gisr & GISR_GRP2) {
+		st = readl(&regs->gisr2);
+		writel(0, &regs->gisr2);
+
+		if (st & GISR2_RESET)
+			printf("fotg210: reset by host\n");
+		else if (st & GISR2_SUSPEND)
+			printf("fotg210: suspend/removed\n");
+		else if (st & GISR2_RESUME)
+			printf("fotg210: resume\n");
+
+		/* Errors */
+		if (st & GISR2_ISOCERR)
+			printf("fotg210: iso error\n");
+		if (st & GISR2_ISOCABT)
+			printf("fotg210: iso abort\n");
+		if (st & GISR2_DMAERR)
+			printf("fotg210: dma error\n");
+	}
+
+	return 0;
+}
+
+int usb_gadget_register_driver(struct usb_gadget_driver *driver)
+{
+	int i, ret = 0;
+	struct fotg210_chip *chip = &controller;
+
+	if (!driver    || !driver->bind || !driver->setup) {
+		puts("fotg210: bad parameter.\n");
+		return -EINVAL;
+	}
+
+	INIT_LIST_HEAD(&chip->gadget.ep_list);
+	for (i = 0; i < CFG_NUM_ENDPOINTS + 1; ++i) {
+		struct fotg210_ep *ep = chip->ep + i;
+
+		ep->ep.maxpacket = ep->maxpacket;
+		INIT_LIST_HEAD(&ep->queue);
+
+		if (ep->id == 0) {
+			ep->stopped = 0;
+		} else {
+			ep->stopped = 1;
+			list_add_tail(&ep->ep.ep_list, &chip->gadget.ep_list);
+		}
+	}
+
+	if (fotg210_reset(chip)) {
+		puts("fotg210: reset failed.\n");
+		return -EINVAL;
+	}
+
+	ret = driver->bind(&chip->gadget);
+	if (ret) {
+		debug("fotg210: driver->bind() returned %d\n", ret);
+		return ret;
+	}
+	chip->driver = driver;
+
+	return ret;
+}
+
+int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
+{
+	struct fotg210_chip *chip = &controller;
+
+	driver->unbind(&chip->gadget);
+	chip->driver = NULL;
+
+	pullup(chip, 0);
+
+	return 0;
+}
diff --git a/drivers/usb/gadget/gadget_chips.h b/drivers/usb/gadget/gadget_chips.h
index e570142..f038747 100644
--- a/drivers/usb/gadget/gadget_chips.h
+++ b/drivers/usb/gadget/gadget_chips.h
@@ -150,6 +150,12 @@
 #define gadget_is_mv(g)        0
 #endif

+#ifdef CONFIG_USB_GADGET_FOTG210
+#define gadget_is_fotg210(g)        (!strcmp("fotg210_udc", (g)->name))
+#else
+#define gadget_is_fotg210(g)        0
+#endif
+
 /*
  * CONFIG_USB_GADGET_SX2
  * CONFIG_USB_GADGET_AU1X00
@@ -215,5 +221,7 @@ static inline int usb_gadget_controller_number(struct usb_gadget *gadget)
 		return 0x20;
 	else if (gadget_is_mv(gadget))
 		return 0x21;
+	else if (gadget_is_fotg210(gadget))
+		return 0x22;
 	return -ENOENT;
 }
--
1.7.9.5