Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 659 insertions, 0 deletions

diff --git a/drivers/usb/gadget/udc/cdns2/cdns2-ep0.c b/drivers/usb/gadget/udc/cdns2/cdns2-ep0.c
new file mode 100644
index 0000000000..fa12a5d46f
--- /dev/null
+++ b/drivers/usb/gadget/udc/cdns2/cdns2-ep0.c
@@ -0,0 +1,659 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Cadence USBHS-DEV driver.
+ *
+ * Copyright (C) 2023 Cadence Design Systems.
+ *
+ * Authors: Pawel Laszczak <pawell@cadence.com>
+ */
+
+#include <linux/usb/composite.h>
+#include <asm/unaligned.h>
+
+#include "cdns2-gadget.h"
+#include "cdns2-trace.h"
+
+static struct usb_endpoint_descriptor cdns2_gadget_ep0_desc = {
+	.bLength = USB_DT_ENDPOINT_SIZE,
+	.bDescriptorType = USB_DT_ENDPOINT,
+	.bmAttributes =	 USB_ENDPOINT_XFER_CONTROL,
+	.wMaxPacketSize = cpu_to_le16(64)
+};
+
+static int cdns2_w_index_to_ep_index(u16 wIndex)
+{
+	if (!(wIndex & USB_ENDPOINT_NUMBER_MASK))
+		return 0;
+
+	return ((wIndex & USB_ENDPOINT_NUMBER_MASK) * 2) +
+		(wIndex & USB_ENDPOINT_DIR_MASK ? 1 : 0) - 1;
+}
+
+static bool cdns2_check_new_setup(struct cdns2_device *pdev)
+{
+	u8 reg;
+
+	reg = readb(&pdev->ep0_regs->cs);
+
+	return !!(reg & EP0CS_CHGSET);
+}
+
+static void cdns2_ep0_enqueue(struct cdns2_device *pdev, dma_addr_t dma_addr,
+			      unsigned int length, int zlp)
+{
+	struct cdns2_adma_regs __iomem *regs = pdev->adma_regs;
+	struct cdns2_endpoint *pep = &pdev->eps[0];
+	struct cdns2_ring *ring = &pep->ring;
+
+	ring->trbs[0].buffer = cpu_to_le32(TRB_BUFFER(dma_addr));
+	ring->trbs[0].length = cpu_to_le32(TRB_LEN(length));
+
+	if (zlp) {
+		ring->trbs[0].control = cpu_to_le32(TRB_CYCLE |
+						    TRB_TYPE(TRB_NORMAL));
+		ring->trbs[1].buffer = cpu_to_le32(TRB_BUFFER(dma_addr));
+		ring->trbs[1].length = cpu_to_le32(TRB_LEN(0));
+		ring->trbs[1].control = cpu_to_le32(TRB_CYCLE | TRB_IOC |
+					TRB_TYPE(TRB_NORMAL));
+	} else {
+		ring->trbs[0].control = cpu_to_le32(TRB_CYCLE | TRB_IOC |
+					TRB_TYPE(TRB_NORMAL));
+		ring->trbs[1].control = 0;
+	}
+
+	trace_cdns2_queue_trb(pep, ring->trbs);
+
+	if (!pep->dir)
+		writel(0, &pdev->ep0_regs->rxbc);
+
+	cdns2_select_ep(pdev, pep->dir);
+
+	writel(DMA_EP_STS_TRBERR, &regs->ep_sts);
+	writel(pep->ring.dma, &regs->ep_traddr);
+
+	trace_cdns2_doorbell_ep0(pep, readl(&regs->ep_traddr));
+
+	writel(DMA_EP_CMD_DRDY, &regs->ep_cmd);
+}
+
+static int cdns2_ep0_delegate_req(struct cdns2_device *pdev)
+{
+	int ret;
+
+	spin_unlock(&pdev->lock);
+	ret = pdev->gadget_driver->setup(&pdev->gadget, &pdev->setup);
+	spin_lock(&pdev->lock);
+
+	return ret;
+}
+
+static void cdns2_ep0_stall(struct cdns2_device *pdev)
+{
+	struct cdns2_endpoint *pep = &pdev->eps[0];
+	struct cdns2_request *preq;
+
+	preq = cdns2_next_preq(&pep->pending_list);
+	set_reg_bit_8(&pdev->ep0_regs->cs, EP0CS_DSTALL);
+
+	if (pdev->ep0_stage == CDNS2_DATA_STAGE && preq)
+		cdns2_gadget_giveback(pep, preq, -ECONNRESET);
+	else if (preq)
+		list_del_init(&preq->list);
+
+	pdev->ep0_stage = CDNS2_SETUP_STAGE;
+	pep->ep_state |= EP_STALLED;
+}
+
+static void cdns2_status_stage(struct cdns2_device *pdev)
+{
+	struct cdns2_endpoint *pep = &pdev->eps[0];
+	struct cdns2_request *preq;
+
+	preq = cdns2_next_preq(&pep->pending_list);
+	if (preq)
+		list_del_init(&preq->list);
+
+	pdev->ep0_stage = CDNS2_SETUP_STAGE;
+	writeb(EP0CS_HSNAK, &pdev->ep0_regs->cs);
+}
+
+static int cdns2_req_ep0_set_configuration(struct cdns2_device *pdev,
+					   struct usb_ctrlrequest *ctrl_req)
+{
+	enum usb_device_state state = pdev->gadget.state;
+	u32 config = le16_to_cpu(ctrl_req->wValue);
+	int ret;
+
+	if (state < USB_STATE_ADDRESS) {
+		dev_err(pdev->dev, "Set Configuration - bad device state\n");
+		return -EINVAL;
+	}
+
+	ret = cdns2_ep0_delegate_req(pdev);
+	if (ret)
+		return ret;
+
+	trace_cdns2_device_state(config ? "configured" : "addressed");
+
+	if (!config)
+		usb_gadget_set_state(&pdev->gadget, USB_STATE_ADDRESS);
+
+	return 0;
+}
+
+static int cdns2_req_ep0_set_address(struct cdns2_device *pdev, u32 addr)
+{
+	enum usb_device_state device_state = pdev->gadget.state;
+	u8 reg;
+
+	if (addr > USB_DEVICE_MAX_ADDRESS) {
+		dev_err(pdev->dev,
+			"Device address (%d) cannot be greater than %d\n",
+			addr, USB_DEVICE_MAX_ADDRESS);
+		return -EINVAL;
+	}
+
+	if (device_state == USB_STATE_CONFIGURED) {
+		dev_err(pdev->dev,
+			"can't set_address from configured state\n");
+		return -EINVAL;
+	}
+
+	reg = readb(&pdev->usb_regs->fnaddr);
+	pdev->dev_address = reg;
+
+	usb_gadget_set_state(&pdev->gadget,
+			     (addr ? USB_STATE_ADDRESS : USB_STATE_DEFAULT));
+
+	trace_cdns2_device_state(addr ? "addressed" : "default");
+
+	return 0;
+}
+
+static int cdns2_req_ep0_handle_status(struct cdns2_device *pdev,
+				       struct usb_ctrlrequest *ctrl)
+{
+	struct cdns2_endpoint *pep;
+	__le16 *response_pkt;
+	u16 status = 0;
+	int ep_sts;
+	u32 recip;
+
+	recip = ctrl->bRequestType & USB_RECIP_MASK;
+
+	switch (recip) {
+	case USB_RECIP_DEVICE:
+		status = pdev->gadget.is_selfpowered;
+		status |= pdev->may_wakeup << USB_DEVICE_REMOTE_WAKEUP;
+		break;
+	case USB_RECIP_INTERFACE:
+		return cdns2_ep0_delegate_req(pdev);
+	case USB_RECIP_ENDPOINT:
+		ep_sts = cdns2_w_index_to_ep_index(le16_to_cpu(ctrl->wIndex));
+		pep = &pdev->eps[ep_sts];
+
+		if (pep->ep_state & EP_STALLED)
+			status =  BIT(USB_ENDPOINT_HALT);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	put_unaligned_le16(status, (__le16 *)pdev->ep0_preq.request.buf);
+
+	cdns2_ep0_enqueue(pdev, pdev->ep0_preq.request.dma,
+			  sizeof(*response_pkt), 0);
+
+	return 0;
+}
+
+static int cdns2_ep0_handle_feature_device(struct cdns2_device *pdev,
+					   struct usb_ctrlrequest *ctrl,
+					   int set)
+{
+	enum usb_device_state state;
+	enum usb_device_speed speed;
+	int ret = 0;
+	u32 wValue;
+	u16 tmode;
+
+	wValue = le16_to_cpu(ctrl->wValue);
+	state = pdev->gadget.state;
+	speed = pdev->gadget.speed;
+
+	switch (wValue) {
+	case USB_DEVICE_REMOTE_WAKEUP:
+		pdev->may_wakeup = !!set;
+		break;
+	case USB_DEVICE_TEST_MODE:
+		if (state != USB_STATE_CONFIGURED || speed > USB_SPEED_HIGH)
+			return -EINVAL;
+
+		tmode = le16_to_cpu(ctrl->wIndex);
+
+		if (!set || (tmode & 0xff) != 0)
+			return -EINVAL;
+
+		tmode >>= 8;
+		switch (tmode) {
+		case USB_TEST_J:
+		case USB_TEST_K:
+		case USB_TEST_SE0_NAK:
+		case USB_TEST_PACKET:
+			/*
+			 * The USBHS controller automatically handles the
+			 * Set_Feature(testmode) request. Standard test modes
+			 * that use values of test mode selector from
+			 * 01h to 04h (Test_J, Test_K, Test_SE0_NAK,
+			 * Test_Packet) are supported by the
+			 * controller(HS - ack, FS - stall).
+			 */
+			break;
+		default:
+			ret = -EINVAL;
+		}
+		break;
+	default:
+		ret = -EINVAL;
+	}
+
+	return ret;
+}
+
+static int cdns2_ep0_handle_feature_intf(struct cdns2_device *pdev,
+					 struct usb_ctrlrequest *ctrl,
+					 int set)
+{
+	int ret = 0;
+	u32 wValue;
+
+	wValue = le16_to_cpu(ctrl->wValue);
+
+	switch (wValue) {
+	case USB_INTRF_FUNC_SUSPEND:
+		break;
+	default:
+		ret = -EINVAL;
+	}
+
+	return ret;
+}
+
+static int cdns2_ep0_handle_feature_endpoint(struct cdns2_device *pdev,
+					     struct usb_ctrlrequest *ctrl,
+					     int set)
+{
+	struct cdns2_endpoint *pep;
+	u8 wValue;
+
+	wValue = le16_to_cpu(ctrl->wValue);
+	pep = &pdev->eps[cdns2_w_index_to_ep_index(le16_to_cpu(ctrl->wIndex))];
+
+	if (wValue != USB_ENDPOINT_HALT)
+		return -EINVAL;
+
+	if (!(le16_to_cpu(ctrl->wIndex) & ~USB_DIR_IN))
+		return 0;
+
+	switch (wValue) {
+	case USB_ENDPOINT_HALT:
+		if (set || !(pep->ep_state & EP_WEDGE))
+			return cdns2_halt_endpoint(pdev, pep, set);
+		break;
+	default:
+		dev_warn(pdev->dev, "WARN Incorrect wValue %04x\n", wValue);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int cdns2_req_ep0_handle_feature(struct cdns2_device *pdev,
+					struct usb_ctrlrequest *ctrl,
+					int set)
+{
+	switch (ctrl->bRequestType & USB_RECIP_MASK) {
+	case USB_RECIP_DEVICE:
+		return cdns2_ep0_handle_feature_device(pdev, ctrl, set);
+	case USB_RECIP_INTERFACE:
+		return cdns2_ep0_handle_feature_intf(pdev, ctrl, set);
+	case USB_RECIP_ENDPOINT:
+		return cdns2_ep0_handle_feature_endpoint(pdev, ctrl, set);
+	default:
+		return -EINVAL;
+	}
+}
+
+static int cdns2_ep0_std_request(struct cdns2_device *pdev)
+{
+	struct usb_ctrlrequest *ctrl = &pdev->setup;
+	int ret;
+
+	switch (ctrl->bRequest) {
+	case USB_REQ_SET_ADDRESS:
+		ret = cdns2_req_ep0_set_address(pdev,
+						le16_to_cpu(ctrl->wValue));
+		break;
+	case USB_REQ_SET_CONFIGURATION:
+		ret = cdns2_req_ep0_set_configuration(pdev, ctrl);
+		break;
+	case USB_REQ_GET_STATUS:
+		ret = cdns2_req_ep0_handle_status(pdev, ctrl);
+		break;
+	case USB_REQ_CLEAR_FEATURE:
+		ret = cdns2_req_ep0_handle_feature(pdev, ctrl, 0);
+		break;
+	case USB_REQ_SET_FEATURE:
+		ret = cdns2_req_ep0_handle_feature(pdev, ctrl, 1);
+		break;
+	default:
+		ret = cdns2_ep0_delegate_req(pdev);
+		break;
+	}
+
+	return ret;
+}
+
+static void __pending_setup_status_handler(struct cdns2_device *pdev)
+{
+	struct usb_request *request = pdev->pending_status_request;
+
+	if (pdev->status_completion_no_call && request && request->complete) {
+		request->complete(&pdev->eps[0].endpoint, request);
+		pdev->status_completion_no_call = 0;
+	}
+}
+
+void cdns2_pending_setup_status_handler(struct work_struct *work)
+{
+	struct cdns2_device *pdev = container_of(work, struct cdns2_device,
+						 pending_status_wq);
+	unsigned long flags;
+
+	spin_lock_irqsave(&pdev->lock, flags);
+	__pending_setup_status_handler(pdev);
+	spin_unlock_irqrestore(&pdev->lock, flags);
+}
+
+void cdns2_handle_setup_packet(struct cdns2_device *pdev)
+{
+	struct usb_ctrlrequest *ctrl = &pdev->setup;
+	struct cdns2_endpoint *pep = &pdev->eps[0];
+	struct cdns2_request *preq;
+	int ret = 0;
+	u16 len;
+	u8 reg;
+	int i;
+
+	writeb(EP0CS_CHGSET, &pdev->ep0_regs->cs);
+
+	for (i = 0; i < 8; i++)
+		((u8 *)&pdev->setup)[i] = readb(&pdev->ep0_regs->setupdat[i]);
+
+	/*
+	 * If SETUP packet was modified while reading just simple ignore it.
+	 * The new one will be handled latter.
+	 */
+	if (cdns2_check_new_setup(pdev)) {
+		trace_cdns2_ep0_setup("overridden");
+		return;
+	}
+
+	trace_cdns2_ctrl_req(ctrl);
+
+	if (!pdev->gadget_driver)
+		goto out;
+
+	if (pdev->gadget.state == USB_STATE_NOTATTACHED) {
+		dev_err(pdev->dev, "ERR: Setup detected in unattached state\n");
+		ret = -EINVAL;
+		goto out;
+	}
+
+	pep = &pdev->eps[0];
+
+	/* Halt for Ep0 is cleared automatically when SETUP packet arrives. */
+	pep->ep_state &= ~EP_STALLED;
+
+	if (!list_empty(&pep->pending_list)) {
+		preq = cdns2_next_preq(&pep->pending_list);
+		cdns2_gadget_giveback(pep, preq, -ECONNRESET);
+	}
+
+	len = le16_to_cpu(ctrl->wLength);
+	if (len)
+		pdev->ep0_stage = CDNS2_DATA_STAGE;
+	else
+		pdev->ep0_stage = CDNS2_STATUS_STAGE;
+
+	pep->dir = ctrl->bRequestType & USB_DIR_IN;
+
+	/*
+	 * SET_ADDRESS request is acknowledged automatically by controller and
+	 * in the worse case driver may not notice this request. To check
+	 * whether this request has been processed driver can use
+	 * fnaddr register.
+	 */
+	reg = readb(&pdev->usb_regs->fnaddr);
+	if (pdev->setup.bRequest != USB_REQ_SET_ADDRESS &&
+	    pdev->dev_address != reg)
+		cdns2_req_ep0_set_address(pdev, reg);
+
+	if ((ctrl->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD)
+		ret = cdns2_ep0_std_request(pdev);
+	else
+		ret = cdns2_ep0_delegate_req(pdev);
+
+	if (ret == USB_GADGET_DELAYED_STATUS) {
+		trace_cdns2_ep0_status_stage("delayed");
+		return;
+	}
+
+out:
+	if (ret < 0)
+		cdns2_ep0_stall(pdev);
+	else if (pdev->ep0_stage == CDNS2_STATUS_STAGE)
+		cdns2_status_stage(pdev);
+}
+
+static void cdns2_transfer_completed(struct cdns2_device *pdev)
+{
+	struct cdns2_endpoint *pep = &pdev->eps[0];
+
+	if (!list_empty(&pep->pending_list)) {
+		struct cdns2_request *preq;
+
+		trace_cdns2_complete_trb(pep, pep->ring.trbs);
+		preq = cdns2_next_preq(&pep->pending_list);
+
+		preq->request.actual =
+			TRB_LEN(le32_to_cpu(pep->ring.trbs->length));
+		cdns2_gadget_giveback(pep, preq, 0);
+	}
+
+	cdns2_status_stage(pdev);
+}
+
+void cdns2_handle_ep0_interrupt(struct cdns2_device *pdev, int dir)
+{
+	u32 ep_sts_reg;
+
+	cdns2_select_ep(pdev, dir);
+
+	trace_cdns2_ep0_irq(pdev);
+
+	ep_sts_reg = readl(&pdev->adma_regs->ep_sts);
+	writel(ep_sts_reg, &pdev->adma_regs->ep_sts);
+
+	__pending_setup_status_handler(pdev);
+
+	if ((ep_sts_reg & DMA_EP_STS_IOC) || (ep_sts_reg & DMA_EP_STS_ISP)) {
+		pdev->eps[0].dir = dir;
+		cdns2_transfer_completed(pdev);
+	}
+}
+
+/*
+ * Function shouldn't be called by gadget driver,
+ * endpoint 0 is allways active.
+ */
+static int cdns2_gadget_ep0_enable(struct usb_ep *ep,
+				   const struct usb_endpoint_descriptor *desc)
+{
+	return -EINVAL;
+}
+
+/*
+ * Function shouldn't be called by gadget driver,
+ * endpoint 0 is allways active.
+ */
+static int cdns2_gadget_ep0_disable(struct usb_ep *ep)
+{
+	return -EINVAL;
+}
+
+static int cdns2_gadget_ep0_set_halt(struct usb_ep *ep, int value)
+{
+	struct cdns2_endpoint *pep = ep_to_cdns2_ep(ep);
+	struct cdns2_device *pdev = pep->pdev;
+	unsigned long flags;
+
+	if (!value)
+		return 0;
+
+	spin_lock_irqsave(&pdev->lock, flags);
+	cdns2_ep0_stall(pdev);
+	spin_unlock_irqrestore(&pdev->lock, flags);
+
+	return 0;
+}
+
+static int cdns2_gadget_ep0_set_wedge(struct usb_ep *ep)
+{
+	return cdns2_gadget_ep0_set_halt(ep, 1);
+}
+
+static int cdns2_gadget_ep0_queue(struct usb_ep *ep,
+				  struct usb_request *request,
+				  gfp_t gfp_flags)
+{
+	struct cdns2_endpoint *pep = ep_to_cdns2_ep(ep);
+	struct cdns2_device *pdev = pep->pdev;
+	struct cdns2_request *preq;
+	unsigned long flags;
+	u8 zlp = 0;
+	int ret;
+
+	spin_lock_irqsave(&pdev->lock, flags);
+
+	preq = to_cdns2_request(request);
+
+	trace_cdns2_request_enqueue(preq);
+
+	/* Cancel the request if controller receive new SETUP packet. */
+	if (cdns2_check_new_setup(pdev)) {
+		trace_cdns2_ep0_setup("overridden");
+		spin_unlock_irqrestore(&pdev->lock, flags);
+		return -ECONNRESET;
+	}
+
+	/* Send STATUS stage. Should be called only for SET_CONFIGURATION. */
+	if (pdev->ep0_stage == CDNS2_STATUS_STAGE) {
+		cdns2_status_stage(pdev);
+
+		request->actual = 0;
+		pdev->status_completion_no_call = true;
+		pdev->pending_status_request = request;
+		usb_gadget_set_state(&pdev->gadget, USB_STATE_CONFIGURED);
+		spin_unlock_irqrestore(&pdev->lock, flags);
+
+		/*
+		 * Since there is no completion interrupt for status stage,
+		 * it needs to call ->completion in software after
+		 * cdns2_gadget_ep0_queue is back.
+		 */
+		queue_work(system_freezable_wq, &pdev->pending_status_wq);
+		return 0;
+	}
+
+	if (!list_empty(&pep->pending_list)) {
+		trace_cdns2_ep0_setup("pending");
+		dev_err(pdev->dev,
+			"can't handle multiple requests for ep0\n");
+		spin_unlock_irqrestore(&pdev->lock, flags);
+		return -EBUSY;
+	}
+
+	ret = usb_gadget_map_request_by_dev(pdev->dev, request, pep->dir);
+	if (ret) {
+		spin_unlock_irqrestore(&pdev->lock, flags);
+		dev_err(pdev->dev, "failed to map request\n");
+		return -EINVAL;
+	}
+
+	request->status = -EINPROGRESS;
+	list_add_tail(&preq->list, &pep->pending_list);
+
+	if (request->zero && request->length &&
+	    (request->length % ep->maxpacket == 0))
+		zlp = 1;
+
+	cdns2_ep0_enqueue(pdev, request->dma, request->length, zlp);
+
+	spin_unlock_irqrestore(&pdev->lock, flags);
+
+	return 0;
+}
+
+static const struct usb_ep_ops cdns2_gadget_ep0_ops = {
+	.enable = cdns2_gadget_ep0_enable,
+	.disable = cdns2_gadget_ep0_disable,
+	.alloc_request = cdns2_gadget_ep_alloc_request,
+	.free_request = cdns2_gadget_ep_free_request,
+	.queue = cdns2_gadget_ep0_queue,
+	.dequeue = cdns2_gadget_ep_dequeue,
+	.set_halt = cdns2_gadget_ep0_set_halt,
+	.set_wedge = cdns2_gadget_ep0_set_wedge,
+};
+
+void cdns2_ep0_config(struct cdns2_device *pdev)
+{
+	struct cdns2_endpoint *pep;
+
+	pep = &pdev->eps[0];
+
+	if (!list_empty(&pep->pending_list)) {
+		struct cdns2_request *preq;
+
+		preq = cdns2_next_preq(&pep->pending_list);
+		list_del_init(&preq->list);
+	}
+
+	writeb(EP0_FIFO_AUTO, &pdev->ep0_regs->fifo);
+	cdns2_select_ep(pdev, USB_DIR_OUT);
+	writel(DMA_EP_CFG_ENABLE, &pdev->adma_regs->ep_cfg);
+
+	writeb(EP0_FIFO_IO_TX | EP0_FIFO_AUTO, &pdev->ep0_regs->fifo);
+	cdns2_select_ep(pdev, USB_DIR_IN);
+	writel(DMA_EP_CFG_ENABLE, &pdev->adma_regs->ep_cfg);
+
+	writeb(pdev->gadget.ep0->maxpacket, &pdev->ep0_regs->maxpack);
+	writel(DMA_EP_IEN_EP_OUT0 | DMA_EP_IEN_EP_IN0,
+	       &pdev->adma_regs->ep_ien);
+}
+
+void cdns2_init_ep0(struct cdns2_device *pdev,
+		    struct cdns2_endpoint *pep)
+{
+	u16 maxpacket = le16_to_cpu(cdns2_gadget_ep0_desc.wMaxPacketSize);
+
+	usb_ep_set_maxpacket_limit(&pep->endpoint, maxpacket);
+
+	pep->endpoint.ops = &cdns2_gadget_ep0_ops;
+	pep->endpoint.desc = &cdns2_gadget_ep0_desc;
+	pep->endpoint.caps.type_control = true;
+	pep->endpoint.caps.dir_in = true;
+	pep->endpoint.caps.dir_out = true;
+
+	pdev->gadget.ep0 = &pep->endpoint;
+}