Date:   Tue, 3 Jul 2018 20:57:50 +0100
From:   Pawel Laszczak <pawell@...ence.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        <linux-usb@...r.kernel.org>, Felipe Balbi <balbi@...nel.org>
CC:     <linux-kernel@...r.kernel.org>, <ltyrala@...ence.com>,
        <pawell@...ence.com>
Subject: [PATCH 06/15] Introduce Cadence USBSSP DRD Driver - added gadget-ep0 file.

Signed-off-by: Laszczak Pawel <pawell@...ence.com>
---
 drivers/usb/usbssp/gadget-ep0.c | 565 ++++++++++++++++++++++++++++++++
 1 file changed, 565 insertions(+)
 create mode 100644 drivers/usb/usbssp/gadget-ep0.c

diff --git a/drivers/usb/usbssp/gadget-ep0.c b/drivers/usb/usbssp/gadget-ep0.c
new file mode 100644
index 000000000000..8717dabbe496
--- /dev/null
+++ b/drivers/usb/usbssp/gadget-ep0.c
@@ -0,0 +1,565 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * USBSSP device controller driver
+ *
+ * Copyright (C) 2018 Cadence.
+ *
+ * Author: Pawel Laszczak
+ * Some code borrowed from the Linux XHCI driver.
+ */
+
+#include <linux/list.h>
+#include <linux/usb/gadget.h>
+#include <linux/usb/composite.h>
+#include "gadget-trace.h"
+
+static void usbssp_ep0_stall(struct usbssp_udc *usbssp_data)
+{
+	struct usbssp_ep *dep;
+	int ret = 0;
+
+	dep = &usbssp_data->devs.eps[0];
+	if (usbssp_data->three_stage_setup) {
+		usbssp_dbg(usbssp_data, "Send STALL on Data Stage\n");
+		ret =  usbssp_halt_endpoint(usbssp_data, dep, true);
+
+		/*
+		 * Finishing SETUP transfer by removing request
+		 * from pending list
+		 */
+		if (!list_empty(&dep->pending_list)) {
+			struct usbssp_request	*req;
+
+			req = next_request(&dep->pending_list);
+			usbssp_giveback_request_in_irq(usbssp_data,
+					req->td, -ECONNRESET);
+			dep->ep_state = USBSSP_EP_ENABLED;
+		}
+	} else {
+		usbssp_dbg(usbssp_data, "Send STALL on Status Stage\n");
+		dep->ep_state |= EP0_HALTED_STATUS;
+		usbssp_status_stage(usbssp_data);
+	}
+	usbssp_data->delayed_status = false;
+}
+
+static int usbssp_ep0_delegate_req(struct usbssp_udc *usbssp_data,
+				   struct usb_ctrlrequest *ctrl)
+{
+	int ret;
+
+	usbssp_dbg(usbssp_data, "Delagate request to gadget driver\n");
+	spin_unlock(&usbssp_data->irq_thread_lock);
+
+	ret = usbssp_data->gadget_driver->setup(&usbssp_data->gadget, ctrl);
+	spin_lock(&usbssp_data->irq_thread_lock);
+
+	return ret;
+}
+
+static int usbssp_ep0_set_config(struct usbssp_udc *usbssp_data,
+				 struct usb_ctrlrequest *ctrl)
+{
+	enum usb_device_state state = usbssp_data->gadget.state;
+	u32 cfg;
+	int ret;
+
+	cfg = le16_to_cpu(ctrl->wValue);
+	switch (state) {
+	case USB_STATE_DEFAULT:
+		usbssp_err(usbssp_data,
+			"Error: Set Config request from Default state\n");
+		return -EINVAL;
+	case USB_STATE_ADDRESS:
+		usbssp_dbg(usbssp_data,
+			"Set Configuration from addressed state\n");
+		ret = usbssp_ep0_delegate_req(usbssp_data, ctrl);
+		/* if the cfg matches and the cfg is non zero */
+		if (cfg && (!ret || (ret == USB_GADGET_DELAYED_STATUS))) {
+			/*
+			 * only change state if set_config has already
+			 * been processed. If gadget driver returns
+			 * USB_GADGET_DELAYED_STATUS, we will wait
+			 * to change the state on the next usbssp_enqueue()
+			 */
+			if (ret == 0) {
+				usbssp_info(usbssp_data,
+					"Device has been configured\n");
+				usb_gadget_set_state(&usbssp_data->gadget,
+					USB_STATE_CONFIGURED);
+			}
+		}
+		break;
+	case USB_STATE_CONFIGURED:
+		usbssp_dbg(usbssp_data,
+			"Set Configuration from Configured state\n");
+		ret = usbssp_ep0_delegate_req(usbssp_data, ctrl);
+		if (!cfg && !ret) {
+			usbssp_info(usbssp_data, "reconfigured device\n");
+			usb_gadget_set_state(&usbssp_data->gadget,
+					USB_STATE_ADDRESS);
+		}
+		break;
+	default:
+		usbssp_err(usbssp_data,
+			   "Set Configuration - incorrect device state\n");
+		ret = -EINVAL;
+	}
+	return ret;
+}
+
+static int usbssp_ep0_set_address(struct usbssp_udc *usbssp_data,
+				  struct usb_ctrlrequest *ctrl)
+{
+	enum usb_device_state state = usbssp_data->gadget.state;
+	u32 addr;
+	unsigned int slot_state;
+	struct usbssp_slot_ctx *slot_ctx;
+	int dev_state = 0;
+
+	addr = le16_to_cpu(ctrl->wValue);
+	if (addr > 127) {
+		usbssp_err(usbssp_data, "invalid device address %d\n", addr);
+		return -EINVAL;
+	}
+
+	slot_ctx = usbssp_get_slot_ctx(usbssp_data, usbssp_data->devs.out_ctx);
+	dev_state = GET_SLOT_STATE(le32_to_cpu(slot_ctx->dev_state));
+
+	if (state == USB_STATE_CONFIGURED) {
+		usbssp_err(usbssp_data,
+				"can't SetAddress() from Configured State\n");
+		return -EINVAL;
+	}
+
+	usbssp_data->device_address = le16_to_cpu(ctrl->wValue);
+
+	slot_ctx = usbssp_get_slot_ctx(usbssp_data, usbssp_data->devs.out_ctx);
+	slot_state = GET_SLOT_STATE(le32_to_cpu(slot_ctx->dev_state));
+
+	if (slot_state == SLOT_STATE_ADDRESSED) {
+		/*Reset Device Command*/
+		usbssp_data->defered_event &= ~EVENT_USB_RESET;
+		queue_work(usbssp_data->bottom_irq_wq,
+			&usbssp_data->bottom_irq);
+		usbssp_reset_device(usbssp_data);
+	}
+	/*set device address*/
+	usbssp_address_device(usbssp_data);
+
+	if (addr)
+		usb_gadget_set_state(&usbssp_data->gadget, USB_STATE_ADDRESS);
+	else
+		usb_gadget_set_state(&usbssp_data->gadget, USB_STATE_DEFAULT);
+	return 0;
+}
+
+int usbssp_status_stage(struct usbssp_udc *usbssp_data)
+{
+	struct usbssp_ring *ep_ring;
+	int ret;
+	struct usbssp_ep *dep;
+
+	dep = &usbssp_data->devs.eps[0];
+	ep_ring = usbssp_data->devs.eps[0].ring;
+
+	usbssp_dbg(usbssp_data, "Enqueue Status Stage\n");
+	usbssp_data->ep0state = USBSSP_EP0_STATUS_PHASE;
+	usbssp_data->usb_req_ep0_in.request.length = 0;
+	ret = usbssp_enqueue(usbssp_data->usb_req_ep0_in.dep,
+			&usbssp_data->usb_req_ep0_in);
+	return ret;
+}
+
+
+static int usbssp_ep0_handle_feature_u1(struct usbssp_udc *usbssp_data,
+					enum usb_device_state state, int set)
+{
+	__le32 __iomem *port_regs;
+	u32 temp;
+
+	if (state != USB_STATE_CONFIGURED)
+		usbssp_err(usbssp_data,
+			"Error: can't change U1 - incorrect device state\n");
+		return -EINVAL;
+
+	if ((usbssp_data->gadget.speed  != USB_SPEED_SUPER) &&
+	    (usbssp_data->gadget.speed  != USB_SPEED_SUPER_PLUS))
+		usbssp_err(usbssp_data,
+			"Error: U1 is supported only for SS and SSP\n");
+		return -EINVAL;
+
+	port_regs = usbssp_get_port_io_addr(usbssp_data);
+
+	temp = readl(port_regs+PORTPMSC);
+	temp &= ~PORT_U1_TIMEOUT_MASK;
+
+	if (set)
+		temp |= PORT_U1_TIMEOUT(1);
+	else
+		temp |= PORT_U1_TIMEOUT(0);
+
+	usbssp_info(usbssp_data, "U1 %s\n", set ? "enabled" : "disabled");
+	writel(temp, port_regs+PORTPMSC);
+
+	usbssp_status_stage(usbssp_data);
+	return 0;
+}
+
+static int usbssp_ep0_handle_feature_u2(struct usbssp_udc *usbssp_data,
+					enum usb_device_state state, int set)
+{
+	__le32 __iomem *port_regs;
+	u32 temp;
+
+	if (state != USB_STATE_CONFIGURED) {
+		usbssp_err(usbssp_data,
+			   "Error: can't change U2 - incorrect device state\n");
+		return -EINVAL;
+	}
+	if ((usbssp_data->gadget.speed  != USB_SPEED_SUPER) &&
+	    (usbssp_data->gadget.speed  != USB_SPEED_SUPER_PLUS)) {
+		usbssp_err(usbssp_data,
+			   "Error: U2 is supported only for SS and SSP\n");
+		return -EINVAL;
+	}
+
+	port_regs = usbssp_get_port_io_addr(usbssp_data);
+	temp = readl(port_regs+PORTPMSC);
+	temp &= ~PORT_U1_TIMEOUT_MASK;
+
+	if (set)
+		temp |= PORT_U2_TIMEOUT(1);
+	else
+		temp |= PORT_U2_TIMEOUT(0);
+
+	writel(temp, port_regs+PORTPMSC);
+	usbssp_info(usbssp_data, "U2 %s\n", set ? "enabled" : "disabled");
+
+	usbssp_status_stage(usbssp_data);
+	return 0;
+}
+
+static int usbssp_ep0_handle_feature_test(struct usbssp_udc *usbssp_data,
+					  enum usb_device_state state,
+					  u32 wIndex, int set)
+{
+	int test_mode;
+	__le32 __iomem *port_regs;
+	u32 temp;
+	unsigned long flags;
+	int retval;
+
+	if (usbssp_data->port_major_revision == 0x03)
+		return -EINVAL;
+
+	usbssp_info(usbssp_data, "Test mode; %d\n", wIndex);
+
+	port_regs = usbssp_get_port_io_addr(usbssp_data);
+
+
+	test_mode = (wIndex & 0xff00) >> 8;
+
+	temp = readl(port_regs);
+	temp = usbssp_port_state_to_neutral(temp);
+
+	if (test_mode > TEST_FORCE_EN || test_mode < TEST_J) {
+		/* "stall" on error */
+		retval = -EPIPE;
+	}
+
+	usbssp_status_stage(usbssp_data);
+	retval = usbssp_enter_test_mode(usbssp_data, test_mode, &flags);
+	usbssp_exit_test_mode(usbssp_data);
+
+	return 0;
+}
+
+static int usbssp_ep0_handle_feature_device(struct usbssp_udc *usbssp_data,
+		struct usb_ctrlrequest *ctrl, int set)
+{
+	enum usb_device_state state;
+	u32 wValue;
+	u32 wIndex;
+	int ret = 0;
+
+	wValue = le16_to_cpu(ctrl->wValue);
+	wIndex = le16_to_cpu(ctrl->wIndex);
+	state = usbssp_data->gadget.state;
+
+	switch (wValue) {
+	case USB_DEVICE_REMOTE_WAKEUP:
+		usbssp_data->remote_wakeup_allowed = (set) ? 1 : 0;
+		break;
+	/*
+	 * 9.4.1 says only only for SS, in AddressState only for
+	 * default control pipe
+	 */
+	case USB_DEVICE_U1_ENABLE:
+		ret = usbssp_ep0_handle_feature_u1(usbssp_data, state, set);
+		break;
+	case USB_DEVICE_U2_ENABLE:
+		ret = usbssp_ep0_handle_feature_u2(usbssp_data, state, set);
+		break;
+	case USB_DEVICE_LTM_ENABLE:
+		ret = -EINVAL;
+		break;
+	case USB_DEVICE_TEST_MODE:
+		ret = usbssp_ep0_handle_feature_test(usbssp_data, state,
+				wIndex, set);
+		break;
+	default:
+		usbssp_err(usbssp_data, "%s Feature Request not supported\n",
+				(set) ? "Set" : "Clear");
+		ret = -EINVAL;
+	}
+
+	return ret;
+}
+
+static int usbssp_ep0_handle_feature_intf(struct usbssp_udc *usbssp_data,
+					  struct usb_ctrlrequest *ctrl,
+					  int set)
+{
+	u32 wValue;
+	int ret = 0;
+
+	wValue = le16_to_cpu(ctrl->wValue);
+
+	switch (wValue) {
+	case USB_INTRF_FUNC_SUSPEND:
+		/*TODO: suspend device */
+		break;
+	default:
+		ret = -EINVAL;
+	}
+
+	return ret;
+}
+
+static int usbssp_ep0_handle_feature_endpoint(struct usbssp_udc *usbssp_data,
+		struct usb_ctrlrequest *ctrl, int set)
+{
+	struct usbssp_ep *dep;
+	u32 wValue, wIndex;
+	unsigned int ep_index = 0;
+	struct usbssp_ring *ep_ring;
+	struct usbssp_td *td;
+
+	wValue = le16_to_cpu(ctrl->wValue);
+	wIndex = le16_to_cpu(ctrl->wIndex);
+	ep_index = ((wIndex & USB_ENDPOINT_NUMBER_MASK) << 1);
+
+	if ((wIndex & USB_ENDPOINT_DIR_MASK) == USB_DIR_OUT)
+		ep_index -= 1;
+
+	dep =  &usbssp_data->devs.eps[ep_index];
+	ep_ring = dep->ring;
+
+	switch (wValue) {
+	case USB_ENDPOINT_HALT:
+		if (set == 0 && (dep->ep_state & USBSSP_EP_WEDGE))
+			break;
+
+		usbssp_halt_endpoint(usbssp_data, dep,  set);
+
+		td = list_first_entry(&ep_ring->td_list, struct usbssp_td,
+				td_list);
+
+		usbssp_cleanup_halted_endpoint(usbssp_data, ep_index,
+				ep_ring->stream_id, td,
+				EP_HARD_RESET);
+		break;
+	default:
+		usbssp_warn(usbssp_data, "WARN Incorrect wValue %04x\n",
+				wValue);
+		return -EINVAL;
+	}
+	return 0;
+}
+
+int usbssp_ep0_handle_feature(struct usbssp_udc *usbssp_data,
+		struct usb_ctrlrequest *ctrl, int set)
+{
+	u32 recip;
+	int ret;
+
+	recip = ctrl->bRequestType & USB_RECIP_MASK;
+
+	switch (recip) {
+	case USB_RECIP_DEVICE:
+		ret = usbssp_ep0_handle_feature_device(usbssp_data, ctrl, set);
+		break;
+	case USB_RECIP_INTERFACE:
+		ret = usbssp_ep0_handle_feature_intf(usbssp_data, ctrl, set);
+		break;
+	case USB_RECIP_ENDPOINT:
+		ret = usbssp_ep0_handle_feature_endpoint(usbssp_data,
+				ctrl, set);
+		break;
+	default:
+		ret = -EINVAL;
+	}
+
+	return ret;
+}
+
+static int usbssp_ep0_set_sel(struct usbssp_udc *usbssp_data,
+			      struct usb_ctrlrequest *ctrl)
+{
+	struct usbssp_ep *dep;
+	enum usb_device_state state = usbssp_data->gadget.state;
+	u16 wLength;
+	int ret = 0;
+
+	if (state == USB_STATE_DEFAULT)
+		return -EINVAL;
+
+	wLength = le16_to_cpu(ctrl->wLength);
+
+	if (wLength != 6) {
+		usbssp_err(usbssp_data, "Set SEL should be 6 bytes, got %d\n",
+				wLength);
+		return -EINVAL;
+	}
+
+	/*
+	 * To handle Set SEL we need to receive 6 bytes from Host. So let's
+	 * queue a usb_request for 6 bytes.
+	 */
+	dep = &usbssp_data->devs.eps[0];
+
+	usbssp_data->usb_req_ep0_in.request.length = 0x6;
+	usbssp_data->usb_req_ep0_in.request.buf = usbssp_data->setup_buf;
+
+	ret = usbssp_enqueue(usbssp_data->usb_req_ep0_in.dep,
+			&usbssp_data->usb_req_ep0_in);
+	if (ret) {
+		usbssp_err(usbssp_data, "Error in  Set Sel\n");
+		return ret;
+	}
+	return 0;
+}
+
+static int usbssp_ep0_std_request(struct usbssp_udc *usbssp_data,
+				  struct usb_ctrlrequest *ctrl)
+{
+	int ret = 0;
+
+	usbssp_data->bos_event_detected = 0;
+
+	switch (ctrl->bRequest) {
+	case USB_REQ_GET_STATUS:
+		usbssp_info(usbssp_data, "Request GET_STATUS\n");
+		/*TODO:*/
+		//ret = usbssp_ep0_handle_status(usbssp_data, ctrl);
+		break;
+	case USB_REQ_CLEAR_FEATURE:
+		usbssp_info(usbssp_data, "Request CLEAR_FEATURE\n");
+		ret = usbssp_ep0_handle_feature(usbssp_data, ctrl, 0);
+		break;
+	case USB_REQ_SET_FEATURE:
+		usbssp_info(usbssp_data, "Request SET_FEATURE\n");
+		ret = usbssp_ep0_handle_feature(usbssp_data, ctrl, 1);
+		break;
+	case USB_REQ_SET_ADDRESS:
+		usbssp_info(usbssp_data, "Request SET_ADDRESS\n");
+		ret = usbssp_ep0_set_address(usbssp_data, ctrl);
+		break;
+	case USB_REQ_SET_CONFIGURATION:
+		usbssp_info(usbssp_data, "Request SET_CONFIGURATION\n");
+		ret = usbssp_ep0_set_config(usbssp_data, ctrl);
+		break;
+	case USB_REQ_SET_SEL:
+		usbssp_info(usbssp_data, "Request SET_SEL\n");
+		ret = usbssp_ep0_set_sel(usbssp_data, ctrl);
+		break;
+	case USB_REQ_SET_ISOCH_DELAY:
+		usbssp_info(usbssp_data, "Request SET_ISOCH_DELAY\n");
+		/*TODO:*/
+		//ret = usbssp_ep0_set_isoch_delay(usbssp_data, ctrl);
+		break;
+	default:
+		if ((le16_to_cpu(ctrl->wValue) >> 8) == USB_DT_BOS &&
+		    ctrl->bRequest == USB_REQ_GET_DESCRIPTOR) {
+			/*
+			 * It will be handled after Status Stage phase
+			 * in usbssp_gadget_giveback
+			 */
+			usbssp_data->bos_event_detected = true;
+		}
+		ret = usbssp_ep0_delegate_req(usbssp_data, ctrl);
+		break;
+	}
+	return ret;
+}
+
+int usbssp_setup_analyze(struct usbssp_udc *usbssp_data)
+{
+	int ret = -EINVAL;
+	struct usb_ctrlrequest *ctrl = &usbssp_data->setup;
+	u32 len = 0;
+	struct usbssp_device *priv_dev;
+
+	ctrl = &usbssp_data->setup;
+
+	usbssp_info(usbssp_data,
+			"SETUP BRT: %02x BR: %02x V: %04x I: %04x L: %04x\n",
+			ctrl->bRequestType, ctrl->bRequest,
+			le16_to_cpu(ctrl->wValue), le16_to_cpu(ctrl->wIndex),
+			le16_to_cpu(ctrl->wLength));
+
+	if (!usbssp_data->gadget_driver)
+		goto out;
+
+	priv_dev = &usbssp_data->devs;
+
+	/*
+	 * First of all, if endpoint 0 was halted driver has to
+	 * recovery it.
+	 */
+	if (priv_dev->eps[0].ep_state & EP_HALTED) {
+		usbssp_dbg(usbssp_data,
+			"Ep0 Halted - restoring to nomral state\n");
+		usbssp_halt_endpoint(usbssp_data, &priv_dev->eps[0], 0);
+	}
+
+	/*
+	 * Finishing previous SETUP transfer by removing request from
+	 * list and informing upper layer
+	 */
+	if (!list_empty(&priv_dev->eps[0].pending_list)) {
+		struct usbssp_request	*req;
+
+		usbssp_dbg(usbssp_data,
+				"Deleting previous Setup transaction\n");
+		req = next_request(&priv_dev->eps[0].pending_list);
+		usbssp_dequeue(&priv_dev->eps[0], req);
+	}
+
+	len = le16_to_cpu(ctrl->wLength);
+	if (!len) {
+		usbssp_data->three_stage_setup = false;
+		usbssp_data->ep0_expect_in = false;
+	} else {
+		usbssp_data->three_stage_setup = true;
+		usbssp_data->ep0_expect_in =
+				!!(ctrl->bRequestType & USB_DIR_IN);
+	}
+
+	if ((ctrl->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD)
+		ret = usbssp_ep0_std_request(usbssp_data, ctrl);
+	else
+		ret = usbssp_ep0_delegate_req(usbssp_data, ctrl);
+
+	if (ret == USB_GADGET_DELAYED_STATUS) {
+		usbssp_dbg(usbssp_data, "Status Stage delayed\n");
+		usbssp_data->delayed_status = true;
+	}
+
+out:
+	if (ret < 0)
+		usbssp_ep0_stall(usbssp_data);
+
+	return ret;
+}
-- 
2.17.1

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