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Subject[PATCH 06/15] Introduce Cadence USBSSP DRD Driver - added gadget-ep0 file.
Date
Signed-off-by: Laszczak Pawel <pawell@cadence.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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