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Subject[PATCH 01/15] Introduce Cadence USBSSP DRD Driver - added gadget.c file.
Date
From: Laszczak Pawel <pawell.cadence.com>

Signed-off-by: Laszczak Pawel <pawell@cadence.com>
---
drivers/usb/usbssp/gadget.c | 2082 +++++++++++++++++++++++++++++++++++
1 file changed, 2082 insertions(+)
create mode 100644 drivers/usb/usbssp/gadget.c

diff --git a/drivers/usb/usbssp/gadget.c b/drivers/usb/usbssp/gadget.c
new file mode 100644
index 000000000000..151e451f9909
--- /dev/null
+++ b/drivers/usb/usbssp/gadget.c
@@ -0,0 +1,2082 @@
+// 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/pci.h>
+#include <linux/irq.h>
+#include <linux/log2.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/slab.h>
+#include <linux/dmi.h>
+#include <linux/dma-mapping.h>
+#include <linux/delay.h>
+
+#include "gadget-trace.h"
+#include "gadget-debugfs.h"
+#include "gadget.h"
+
+u64 usbssp_get_hw_deq(struct usbssp_udc *usbssp_data,
+ struct usbssp_device *dev,
+ unsigned int ep_index, unsigned int stream_id);
+
+void usbssp_bottom_irq(struct work_struct *work)
+{
+ struct usbssp_udc *usbssp_data = container_of(work, struct usbssp_udc,
+ bottom_irq);
+
+ usbssp_dbg(usbssp_data, "===== Bottom IRQ handler start ====\n");
+
+ if (usbssp_data->usbssp_state & USBSSP_STATE_DYING) {
+ usbssp_err(usbssp_data, "Device controller dying\n");
+ return;
+ }
+
+ mutex_lock(&usbssp_data->mutex);
+ spin_lock_irqsave(&usbssp_data->irq_thread_lock,
+ usbssp_data->irq_thread_flag);
+
+ if (usbssp_data->defered_event & EVENT_DEV_DISCONECTED) {
+ usbssp_dbg(usbssp_data, "Disconnecting device sequence\n");
+ usbssp_data->defered_event &= ~EVENT_DEV_DISCONECTED;
+ usbssp_data->usbssp_state |= USBSSP_STATE_DISCONNECT_PENDING;
+ usbssp_stop_device(usbssp_data, 0);
+
+ //time needed for disconnect
+ usbssp_gadget_disconnect_interrupt(usbssp_data);
+ usbssp_data->gadget.speed = USB_SPEED_UNKNOWN;
+ usb_gadget_set_state(&usbssp_data->gadget, USB_STATE_NOTATTACHED);
+
+ usbssp_dbg(usbssp_data, "Wait for disconnect\n");
+
+ spin_unlock_irqrestore(&usbssp_data->irq_thread_lock,
+ usbssp_data->irq_thread_flag);
+ /*fixme: should be replaced by wait_for_completion*/
+ msleep(200);
+ spin_lock_irqsave(&usbssp_data->irq_thread_lock,
+ usbssp_data->irq_thread_flag);
+ }
+
+ if (usbssp_data->defered_event & EVENT_DEV_CONNECTED) {
+ usbssp_dbg(usbssp_data, "Connecting device sequence\n");
+ if (usbssp_data->usbssp_state & USBSSP_STATE_DISCONNECT_PENDING) {
+ usbssp_free_dev(usbssp_data);
+ usbssp_data->usbssp_state &= ~USBSSP_STATE_DISCONNECT_PENDING;
+ }
+
+ usbssp_data->defered_event &= ~EVENT_DEV_CONNECTED;
+ usbssp_alloc_dev(usbssp_data);
+ }
+
+ if (usbssp_data->defered_event & EVENT_USB_RESET) {
+ __le32 __iomem *port_regs;
+ u32 temp;
+
+ usbssp_dbg(usbssp_data, "Beginning USB reset device sequence\n");
+
+ /*Reset Device Command*/
+ usbssp_data->defered_event &= ~EVENT_USB_RESET;
+ usbssp_reset_device(usbssp_data);
+ usbssp_data->devs.eps[0].ep_state |= USBSSP_EP_ENABLED;
+ usbssp_data->defered_event &= ~EVENT_DEV_CONNECTED;
+
+ usbssp_enable_device(usbssp_data);
+ if ((usbssp_data->gadget.speed == USB_SPEED_SUPER) ||
+ (usbssp_data->gadget.speed == USB_SPEED_SUPER_PLUS)) {
+ usbssp_dbg(usbssp_data, "Set U1/U2 enable\n");
+ port_regs = usbssp_get_port_io_addr(usbssp_data);
+ temp = readl(port_regs+PORTPMSC);
+ temp &= ~(PORT_U1_TIMEOUT_MASK | PORT_U2_TIMEOUT_MASK);
+ temp |= PORT_U1_TIMEOUT(1) | PORT_U2_TIMEOUT(1);
+ writel(temp, port_regs+PORTPMSC);
+ }
+ }
+
+ /*handle setup packet*/
+ if (usbssp_data->defered_event & EVENT_SETUP_PACKET) {
+ usbssp_dbg(usbssp_data, "Beginning handling SETUP packet\n");
+ usbssp_data->defered_event &= ~EVENT_SETUP_PACKET;
+ usbssp_setup_analyze(usbssp_data);
+ }
+
+ spin_unlock_irqrestore(&usbssp_data->irq_thread_lock,
+ usbssp_data->irq_thread_flag);
+ mutex_unlock(&usbssp_data->mutex);
+ usbssp_dbg(usbssp_data, "===== Bottom IRQ handler end ====\n");
+}
+
+/*
+ * usbssp_handshake - spin reading dc until handshake completes or fails
+ * @ptr: address of dc register to be read
+ * @mask: bits to look at in result of read
+ * @done: value of those bits when handshake succeeds
+ * @usec: timeout in microseconds
+ *
+ * Returns negative errno, or zero on success
+ *
+ * Success happens when the "mask" bits have the specified value (hardware
+ * handshake done). There are two failure modes: "usec" have passed (major
+ * hardware flakeout), or the register reads as all-ones (hardware removed).
+ */
+int usbssp_handshake(void __iomem *ptr, u32 mask, u32 done, int usec)
+{
+ u32 result;
+
+ do {
+ result = readl(ptr);
+ if (result == ~(u32)0) /* card removed */
+ return -ENODEV;
+ result &= mask;
+ if (result == done)
+ return 0;
+ udelay(1);
+ usec--;
+ } while (usec > 0);
+ return -ETIMEDOUT;
+}
+
+/*
+ * Disable interrupts and begin the DC halting process.
+ */
+void usbssp_quiesce(struct usbssp_udc *usbssp_data)
+{
+ u32 halted;
+ u32 cmd;
+ u32 mask;
+
+ mask = ~(USBSSP_IRQS);
+
+ halted = readl(&usbssp_data->op_regs->status) & STS_HALT;
+ if (!halted)
+ mask &= ~CMD_RUN;
+
+ cmd = readl(&usbssp_data->op_regs->command);
+ cmd &= mask;
+ writel(cmd, &usbssp_data->op_regs->command);
+}
+
+/*
+ * Force DC into halt state.
+ *
+ * Disable any IRQs and clear the run/stop bit.
+ * USBSSP will complete any current and actively pipelined transactions, and
+ * should halt within 16 ms of the run/stop bit being cleared.
+ * Read DC Halted bit in the status register to see when the DC is finished.
+ */
+int usbssp_halt(struct usbssp_udc *usbssp_data)
+{
+ int ret;
+
+ usbssp_dbg_trace(usbssp_data, trace_usbssp_dbg_init,
+ "// Halt the USBSSP");
+ usbssp_quiesce(usbssp_data);
+
+ ret = usbssp_handshake(&usbssp_data->op_regs->status,
+ STS_HALT, STS_HALT, USBSSP_MAX_HALT_USEC);
+
+ if (!ret) {
+ usbssp_warn(usbssp_data, "Device halt failed, %d\n", ret);
+ return ret;
+ }
+
+ usbssp_data->usbssp_state |= USBSSP_STATE_HALTED;
+ usbssp_data->cmd_ring_state = CMD_RING_STATE_STOPPED;
+ return ret;
+}
+
+/*
+ * Set the run bit and wait for the device to be running.
+ */
+int usbssp_start(struct usbssp_udc *usbssp_data)
+{
+ u32 temp;
+ int ret;
+
+ temp = readl(&usbssp_data->op_regs->command);
+ temp |= (CMD_RUN | CMD_DEVEN);
+ usbssp_dbg_trace(usbssp_data, trace_usbssp_dbg_init,
+ "// Turn on USBSSP, cmd = 0x%x.", temp);
+ writel(temp, &usbssp_data->op_regs->command);
+
+ /*
+ * Wait for the HCHalted Staus bit to be 0 to indicate the device is
+ * running.
+ */
+ ret = usbssp_handshake(&usbssp_data->op_regs->status,
+ STS_HALT, 0, USBSSP_MAX_HALT_USEC);
+
+ if (ret == -ETIMEDOUT)
+ usbssp_err(usbssp_data, "Device took too long to start, waited %u microseconds.\n",
+ USBSSP_MAX_HALT_USEC);
+ if (!ret)
+ /* clear state flags. Including dying, halted or removing */
+ usbssp_data->usbssp_state = 0;
+
+ return ret;
+}
+
+/*
+ * Reset a halted DC.
+ *
+ * This resets pipelines, timers, counters, state machines, etc.
+ * Transactions will be terminated immediately, and operational registers
+ * will be set to their defaults.
+ */
+int usbssp_reset(struct usbssp_udc *usbssp_data)
+{
+ u32 command;
+ u32 state;
+ int ret;
+
+ state = readl(&usbssp_data->op_regs->status);
+
+ if (state == ~(u32)0) {
+ usbssp_warn(usbssp_data, "Device not accessible, reset failed.\n");
+ return -ENODEV;
+ }
+
+ if ((state & STS_HALT) == 0) {
+ usbssp_warn(usbssp_data, "DC not halted, aborting reset.\n");
+ return 0;
+ }
+
+ usbssp_dbg_trace(usbssp_data, trace_usbssp_dbg_init, "// Reset the DC");
+ command = readl(&usbssp_data->op_regs->command);
+ command |= CMD_RESET;
+ writel(command, &usbssp_data->op_regs->command);
+
+ ret = usbssp_handshake(&usbssp_data->op_regs->command,
+ CMD_RESET, 0, 10 * 1000 * 1000);
+
+ if (ret)
+ return ret;
+ usbssp_dbg_trace(usbssp_data, trace_usbssp_dbg_init,
+ "Wait for controller to be ready for doorbell rings");
+ /*
+ * USBSSP cannot write to any doorbells or operational registers other
+ * than status until the "Controller Not Ready" flag is cleared.
+ */
+ ret = usbssp_handshake(&usbssp_data->op_regs->status,
+ STS_CNR, 0, 10 * 1000 * 1000);
+
+ return ret;
+}
+
+static inline int usbssp_try_enable_msi(struct usbssp_udc *usbssp_data)
+{
+ usbssp_data->msi_enabled = 1;
+ return 0;
+}
+
+static inline void usbssp_cleanup_msix(struct usbssp_udc *usbssp_data)
+{
+ /*TODO*/
+}
+
+static inline void usbssp_msix_sync_irqs(struct usbssp_udc *usbssp_data)
+{
+ /*TODO*/
+}
+
+/*
+ * Initialize memory for gadget driver and USBSSP (one-time init).
+ *
+ * Program the PAGESIZE register, initialize the device context array, create
+ * device contexts, set up a command ring segment (or two?), create event
+ * ring (one for now).
+ */
+int usbssp_init(struct usbssp_udc *usbssp_data)
+{
+ int retval = 0;
+
+ usbssp_dbg_trace(usbssp_data, trace_usbssp_dbg_init, "usbssp_init");
+
+ spin_lock_init(&usbssp_data->lock);
+ spin_lock_init(&usbssp_data->irq_thread_lock);
+ retval = usbssp_mem_init(usbssp_data, GFP_KERNEL);
+
+ usbssp_dbg_trace(usbssp_data, trace_usbssp_dbg_init,
+ "Finished usbssp_init");
+ return retval;
+}
+
+/*-------------------------------------------------------------------------*/
+static int usbssp_run_finished(struct usbssp_udc *usbssp_data)
+{
+ if (usbssp_start(usbssp_data)) {
+ usbssp_halt(usbssp_data);
+ return -ENODEV;
+ }
+// usbssp_data->usbssp_state = USBSSP_STATE_RUNNING;
+ usbssp_data->cmd_ring_state = CMD_RING_STATE_RUNNING;
+
+ usbssp_dbg_trace(usbssp_data, trace_usbssp_dbg_init,
+ "Finished usbssp_run for USB3 device");
+ return 0;
+}
+
+/*
+ * Start the USBSSP after it was halted.
+ *
+ * This function is called by the usbssp_gadget_start function when the
+ * gadget driver is started. Its opposite is usbssp_stop().
+ *
+ * usbssp_init() must be called once before this function can be called.
+ * Reset the USBSSP, enable device slot contexts, program DCBAAP, and
+ * set command ring pointer and event ring pointer.
+ */
+int usbssp_run(struct usbssp_udc *usbssp_data)
+{
+ u32 temp;
+ u64 temp_64;
+ int ret;
+ __le32 __iomem *portsc;
+ u32 portsc_val = 0;
+ int i = 0;
+
+ usbssp_dbg_trace(usbssp_data, trace_usbssp_dbg_init, "usbssp_run");
+
+ ret = usbssp_try_enable_msi(usbssp_data);
+ if (ret)
+ return ret;
+
+ temp_64 = usbssp_read_64(usbssp_data,
+ &usbssp_data->ir_set->erst_dequeue);
+ temp_64 &= ~ERST_PTR_MASK;
+ usbssp_dbg_trace(usbssp_data, trace_usbssp_dbg_init,
+ "ERST deq = 64'h%0lx",
+ (unsigned long int) temp_64);
+
+ usbssp_dbg_trace(usbssp_data, trace_usbssp_dbg_init,
+ "// Set the interrupt modulation register");
+ temp = readl(&usbssp_data->ir_set->irq_control);
+ temp &= ~ER_IRQ_INTERVAL_MASK;
+ temp |= (usbssp_data->imod_interval / 250) & ER_IRQ_INTERVAL_MASK;
+ writel(temp, &usbssp_data->ir_set->irq_control);
+
+ /******************************************/
+ //enable USB2 port
+ for (i = 0; i < usbssp_data->num_usb2_ports; i++) {
+ portsc = usbssp_data->usb2_ports + PORTSC;
+ portsc_val = readl(portsc) & ~PORT_PLS_MASK;
+ portsc_val = portsc_val | (5 << 5) | PORT_LINK_STROBE;
+ writel(portsc_val, portsc);
+ }
+
+ //enable USB3.0 port
+ for (i = 0; i < usbssp_data->num_usb3_ports; i++) {
+ portsc = usbssp_data->usb3_ports + PORTSC;
+ portsc_val = readl(portsc) & ~PORT_PLS_MASK;
+ portsc_val = portsc_val | (5 << 5) | PORT_LINK_STROBE;
+ writel(portsc_val, portsc);
+ }
+
+ if (usbssp_start(usbssp_data)) {
+ usbssp_halt(usbssp_data);
+ return -ENODEV;
+ }
+
+ /* Set the USBSSP state before we enable the irqs */
+ temp = readl(&usbssp_data->op_regs->command);
+ temp |= (CMD_EIE);
+ usbssp_dbg_trace(usbssp_data, trace_usbssp_dbg_init,
+ "// Enable interrupts, cmd = 0x%x.", temp);
+ writel(temp, &usbssp_data->op_regs->command);
+
+ temp = readl(&usbssp_data->ir_set->irq_pending);
+ usbssp_dbg_trace(usbssp_data, trace_usbssp_dbg_init,
+ "// Enabling event ring interrupter %p by writing 0x%x to irq_pending",
+ usbssp_data->ir_set, (unsigned int) ER_IRQ_ENABLE(temp));
+ writel(ER_IRQ_ENABLE(temp), &usbssp_data->ir_set->irq_pending);
+
+ usbssp_dbg_trace(usbssp_data, trace_usbssp_dbg_init,
+ "Finished usbssp_run for USBSSP controller");
+
+ usbssp_data->cmd_ring_state = CMD_RING_STATE_RUNNING;
+
+// usbssp_debugfs_init(usbssp_data);
+
+ return 0;
+}
+
+/*
+ * Stop USBSSP controller.
+ *
+ * This function is called by the gadget core when the USBSSP driver is removed.
+ * Its opposite is usbssp_run().
+ *
+ * Disable device contexts, disable IRQs, and quiesce the DC.
+ * Reset the DC, finish any completed transactions, and cleanup memory.
+ */
+void usbssp_stop(struct usbssp_udc *usbssp_data)
+{
+ u32 temp;
+
+ spin_lock_irq(&usbssp_data->lock);
+ usbssp_data->usbssp_state |= USBSSP_STATE_HALTED;
+ usbssp_data->cmd_ring_state = CMD_RING_STATE_STOPPED;
+ usbssp_halt(usbssp_data);
+ usbssp_reset(usbssp_data);
+ spin_unlock_irq(&usbssp_data->lock);
+ usbssp_cleanup_msix(usbssp_data);
+
+ usbssp_dbg_trace(usbssp_data, trace_usbssp_dbg_init,
+ "// Disabling event ring interrupts");
+ temp = readl(&usbssp_data->op_regs->status);
+ writel((temp & ~0x1fff) | STS_EINT, &usbssp_data->op_regs->status);
+ temp = readl(&usbssp_data->ir_set->irq_pending);
+ writel(ER_IRQ_DISABLE(temp), &usbssp_data->ir_set->irq_pending);
+ usbssp_print_ir_set(usbssp_data, 0);
+
+ usbssp_dbg_trace(usbssp_data, trace_usbssp_dbg_init,
+ "cleaning up memory");
+ usbssp_mem_cleanup(usbssp_data);
+// usbssp_debugfs_exit(usbssp_data);
+ usbssp_dbg_trace(usbssp_data, trace_usbssp_dbg_init,
+ "usbssp_stop completed - status = %x",
+ readl(&usbssp_data->op_regs->status));
+}
+
+#ifdef CONFIG_PM
+/*
+ * Stop DC (not bus-specific)
+ *
+ * This is called when the machine transition into S3/S4 mode.
+ *
+ */
+int usbssp_suspend(struct usbssp_udc *usbssp_data, bool do_wakeup)
+{
+ /*TODO*/
+ return -ENOSYS;
+}
+
+/*
+ * start DC (not bus-specific)
+ *
+ * This is called when the machine transition from S3/S4 mode.
+ *
+ */
+int usbssp_resume(struct usbssp_udc *usbssp_data, bool hibernated)
+{
+ /*TODO*/
+ return -ENOSYS;
+}
+
+#endif /* CONFIG_PM */
+
+/**
+ * usbssp_get_endpoint_index - Find the index for an endpoint given its
+ * descriptor.Use the return value to right shift 1 for the bitmask.
+ *
+ * Index = (epnum * 2) + direction - 1,
+ * where direction = 0 for OUT, 1 for IN.
+ * For control endpoints, the IN index is used (OUT index is unused), so
+ * index = (epnum * 2) + direction - 1 = (epnum * 2) + 1 - 1 = (epnum * 2)
+ */
+unsigned int usbssp_get_endpoint_index(
+ const struct usb_endpoint_descriptor *desc)
+{
+ unsigned int index;
+
+ if (usb_endpoint_xfer_control(desc)) {
+ index = (unsigned int) (usb_endpoint_num(desc)*2);
+ } else {
+ index = (unsigned int) (usb_endpoint_num(desc)*2) +
+ (usb_endpoint_dir_in(desc) ? 1 : 0) - 1;
+ }
+ return index;
+}
+
+/* The reverse operation to usbssp_get_endpoint_index.
+ * Calculate the USB endpoint address from the USBSSP endpoint index.
+ */
+unsigned int usbssp_get_endpoint_address(unsigned int ep_index)
+{
+ unsigned int number = DIV_ROUND_UP(ep_index, 2);
+ unsigned int direction = ep_index % 2 ? USB_DIR_OUT : USB_DIR_IN;
+
+ return direction | number;
+}
+
+/* Find the flag for this endpoint (for use in the control context). Use the
+ * endpoint index to create a bitmask. The slot context is bit 0, endpoint 0 is
+ * bit 1, etc.
+ */
+unsigned int usbssp_get_endpoint_flag(
+ const struct usb_endpoint_descriptor *desc)
+{
+ return 1 << (usbssp_get_endpoint_index(desc) + 1);
+}
+
+/* Find the flag for this endpoint (for use in the control context). Use the
+ * endpoint index to create a bitmask. The slot context is bit 0, endpoint 0 is
+ * bit 1, etc.
+ */
+unsigned int usbssp_get_endpoint_flag_from_index(unsigned int ep_index)
+{
+ return 1 << (ep_index + 1);
+}
+
+/* Compute the last valid endpoint context index. Basically, this is the
+ * endpoint index plus one. For slot contexts with more than valid endpoint,
+ * we find the most significant bit set in the added contexts flags.
+ * e.g. ep 1 IN (with epnum 0x81) => added_ctxs = 0b1000
+ * fls(0b1000) = 4, but the endpoint context index is 3, so subtract one.
+ */
+unsigned int usbssp_last_valid_endpoint(u32 added_ctxs)
+{
+ return fls(added_ctxs) - 1;
+}
+
+/* Returns 1 if the arguments are OK;
+ * returns -EINVAL for NULL pointers.
+ */
+
+static int usbssp_check_args(struct usbssp_udc *usbssp_data,
+ struct usbssp_ep *ep, int check_ep,
+ bool check_dev_priv, const char *func)
+{
+ struct usbssp_device *dev_priv;
+
+ if (!usbssp_data || (check_ep && !ep)) {
+ pr_debug("USBSSP %s called with invalid args\n", func);
+ return -EINVAL;
+ }
+
+ if (check_dev_priv)
+ dev_priv = &usbssp_data->devs;
+
+ if (usbssp_data->usbssp_state & USBSSP_STATE_HALTED)
+ return -ENODEV;
+
+ return 1;
+}
+
+static int usbssp_configure_endpoint(struct usbssp_udc *usbssp_data,
+ struct usb_gadget *g,
+ struct usbssp_command *command,
+ bool ctx_change,
+ bool must_succeed);
+
+int usbssp_enqueue(struct usbssp_ep *dep, struct usbssp_request *req_priv)
+{
+ int ret = 0;
+ unsigned int ep_index;
+ unsigned int ep_state;
+ const struct usb_endpoint_descriptor *desc;
+ struct usbssp_udc *usbssp_data = dep->usbssp_data;
+ int num_tds;
+
+ if (usbssp_check_args(usbssp_data, dep, true, true, __func__) <= 0)
+ return -EINVAL;
+
+ if (!dep->endpoint.desc) {
+ usbssp_err(usbssp_data, "%s: can't queue to disabled endpoint\n",
+ dep->name);
+ return -ESHUTDOWN;
+ }
+
+ if (WARN(req_priv->dep != dep, "request %p belongs to '%s'\n",
+ &req_priv->request, req_priv->dep->name)) {
+ usbssp_err(usbssp_data, "%s: reequest %p belongs to '%s'\n",
+ dep->name, &req_priv->request, req_priv->dep->name);
+ return -EINVAL;
+ }
+
+ if (!list_empty(&dep->pending_list) && req_priv->epnum == 0) {
+ usbssp_warn(usbssp_data,
+ "Ep0 has incomplete previous transfer'\n");
+ return -EBUSY;
+ }
+
+ //pm_runtime_get(usbssp_data->dev);
+ req_priv->request.actual = 0;
+ req_priv->request.status = -EINPROGRESS;
+ req_priv->direction = dep->direction;
+ req_priv->epnum = dep->number;
+
+ desc = req_priv->dep->endpoint.desc;
+ ep_index = usbssp_get_endpoint_index(desc);
+ ep_state = usbssp_data->devs.eps[ep_index].ep_state;
+ req_priv->sg = req_priv->request.sg;
+
+ req_priv->num_pending_sgs = req_priv->request.num_mapped_sgs;
+ usbssp_info(usbssp_data, "SG list addr: %p with %d elements.\n",
+ req_priv->sg, req_priv->num_pending_sgs);
+
+ list_add_tail(&req_priv->list, &dep->pending_list);
+
+ if (req_priv->num_pending_sgs > 0)
+ num_tds = req_priv->num_pending_sgs;
+ else
+ num_tds = 1;
+
+ if (req_priv->request.zero && req_priv->request.length &&
+ (req_priv->request.length & (dep->endpoint.maxpacket == 0))) {
+ num_tds++;
+ }
+
+ ret = usb_gadget_map_request_by_dev(usbssp_data->dev,
+ &req_priv->request,
+ dep->direction);
+
+ if (ret) {
+ usbssp_err(usbssp_data, "Can't map request to DMA\n");
+ goto req_del;
+ }
+
+ /*allocating memory for transfer descriptors*/
+ req_priv->td = kzalloc(num_tds * sizeof(struct usbssp_td), GFP_ATOMIC);
+
+ if (!req_priv->td) {
+ ret = -ENOMEM;
+ goto free_priv;
+ }
+
+ if (ep_state & (EP_GETTING_STREAMS | EP_GETTING_NO_STREAMS)) {
+ usbssp_warn(usbssp_data, "WARN: Can't enqueue USB Request, "
+ "ep in streams transition state %x\n",
+ ep_state);
+ ret = -EINVAL;
+ goto free_priv;
+ }
+
+ req_priv->num_tds = num_tds;
+ req_priv->num_tds_done = 0;
+ trace_usbssp_request_enqueue(&req_priv->request);
+
+ switch (usb_endpoint_type(desc)) {
+ case USB_ENDPOINT_XFER_CONTROL:
+ ret = usbssp_queue_ctrl_tx(usbssp_data, GFP_ATOMIC, req_priv,
+ ep_index);
+ break;
+ case USB_ENDPOINT_XFER_BULK:
+ ret = usbssp_queue_bulk_tx(usbssp_data, GFP_ATOMIC, req_priv,
+ ep_index);
+ break;
+ case USB_ENDPOINT_XFER_INT:
+ ret = usbssp_queue_intr_tx(usbssp_data, GFP_ATOMIC, req_priv,
+ ep_index);
+ break;
+ case USB_ENDPOINT_XFER_ISOC:
+ ret = usbssp_queue_isoc_tx_prepare(usbssp_data, GFP_ATOMIC,
+ req_priv, ep_index);
+ }
+
+ if (ret < 0) {
+free_priv:
+ usb_gadget_unmap_request_by_dev(usbssp_data->dev,
+ &req_priv->request, dep->direction);
+ usbssp_request_free_priv(req_priv);
+
+req_del:
+ list_del(&req_priv->list);
+ }
+ return ret;
+}
+
+/*
+ * Remove the request's TD from the endpoint ring. This may cause the DC to stop
+ * USB transfers, potentially stopping in the middle of a TRB buffer. The DC
+ * should pick up where it left off in the TD, unless a Set Transfer Ring
+ * Dequeue Pointer is issued.
+ *
+ * The TRBs that make up the buffers for the canceled request will be "removed"
+ * from the ring. Since the ring is a contiguous structure, they can't be
+ * physically removed. Instead, there are two options:
+ *
+ * 1) If the DC is in the middle of processing the request to be canceled, we
+ * simply move the ring's dequeue pointer past those TRBs using the Set
+ * Transfer Ring Dequeue Pointer command. This will be the common case,
+ * when drivers timeout on the last submitted request and attempt to cancel.
+ *
+ * 2) If the DC is in the middle of a different TD, we turn the TRBs into a
+ * series of 1-TRB transfer no-op TDs. (No-ops shouldn't be chained.) The
+ * DC will need to invalidate the any TRBs it has cached after the stop
+ * endpoint command.
+ *
+ * 3) The TD may have completed by the time the Stop Endpoint Command
+ * completes, so software needs to handle that case too.
+ *
+ * This function should protect against the TD enqueueing code ringing the
+ * doorbell while this code is waiting for a Stop Endpoint command to complete.
+ *
+ */
+int usbssp_dequeue(struct usbssp_ep *ep_priv, struct usbssp_request *req_priv)
+{
+ int ret = 0, i;
+ struct usbssp_udc *usbssp_data;
+ unsigned int ep_index;
+ struct usbssp_ring *ep_ring;
+ struct usbssp_device *priv_dev;
+ struct usbssp_ep_ctx *ep_ctx;
+
+ usbssp_data = ep_priv->usbssp_data;
+ trace_usbssp_request_dequeue(&req_priv->request);
+
+ priv_dev = &usbssp_data->devs;
+ ep_index = usbssp_get_endpoint_index(req_priv->dep->endpoint.desc);
+ ep_priv = &usbssp_data->devs.eps[ep_index];
+ ep_ring = usbssp_request_to_transfer_ring(usbssp_data, req_priv);
+
+ if (!ep_ring)
+ goto err_giveback;
+
+ i = req_priv->num_tds_done;
+
+ if (i < req_priv->num_tds)
+ usbssp_dbg_trace(usbssp_data, trace_usbssp_dbg_cancel_request,
+ "Cancel request %p, dev %s, ep 0x%x, "
+ "starting at offset 0x%llx",
+ &req_priv->request, usbssp_data->gadget.name,
+ req_priv->dep->endpoint.desc->bEndpointAddress,
+ (unsigned long long) usbssp_trb_virt_to_dma(
+ req_priv->td[i].start_seg,
+ req_priv->td[i].first_trb));
+
+ /* Queue a stop endpoint command, but only if it is
+ * in EP_STATE_RUNNING state.
+ */
+ ep_ctx = usbssp_get_ep_ctx(usbssp_data, priv_dev->out_ctx, ep_index);
+ if (GET_EP_CTX_STATE(ep_ctx) == EP_STATE_RUNNING) {
+ ret = usbssp_cmd_stop_ep(usbssp_data, &usbssp_data->gadget,
+ ep_priv);
+ if (ret)
+ return ret;
+ }
+
+ usbssp_remove_request(usbssp_data, req_priv, ep_index);
+ return ret;
+
+err_giveback:
+ usbssp_giveback_request_in_irq(usbssp_data, req_priv->td, -ESHUTDOWN);
+ return ret;
+}
+
+/* Drop an endpoint from a new bandwidth configuration for this device.
+ * Only one call to this function is allowed per endpoint before
+ * check_bandwidth() or reset_bandwidth() must be called.
+ * A call to usbssp_drop_endpoint() followed by a call to usbssp_add_endpoint()
+ * will add the endpoint to the schedule with possibly new parameters
+ * denoted by a different endpoint descriptor in usbssp_ep.
+ * A call to usbssp_add_endpoint() followed by a call to
+ * usbsssp_drop_endpoint() is not allowed.
+ */
+int usbssp_drop_endpoint(struct usbssp_udc *usbssp_data, struct usb_gadget *g,
+ struct usbssp_ep *dep)
+{
+ struct usbssp_container_ctx *in_ctx, *out_ctx;
+ struct usbssp_input_control_ctx *ctrl_ctx;
+ unsigned int ep_index;
+ struct usbssp_ep_ctx *ep_ctx;
+ u32 drop_flag;
+ u32 new_add_flags, new_drop_flags;
+ int ret;
+
+ ret = usbssp_check_args(usbssp_data, dep, 1, true, __func__);
+ if (ret <= 0)
+ return ret;
+
+ if (usbssp_data->usbssp_state & USBSSP_STATE_DYING)
+ return -ENODEV;
+
+ drop_flag = usbssp_get_endpoint_flag(dep->endpoint.desc);
+ if (drop_flag == SLOT_FLAG || drop_flag == EP0_FLAG) {
+ usbssp_dbg(usbssp_data, "USBSSP %s - can't drop slot or ep 0 %#x\n",
+ __func__, drop_flag);
+ return 0;
+ }
+
+ in_ctx = usbssp_data->devs.in_ctx;
+ out_ctx = usbssp_data->devs.out_ctx;
+ ctrl_ctx = usbssp_get_input_control_ctx(in_ctx);
+ if (!ctrl_ctx) {
+ usbssp_warn(usbssp_data, "%s: Could not get input context, bad type.\n",
+ __func__);
+ return 0;
+ }
+
+ ep_index = usbssp_get_endpoint_index(dep->endpoint.desc);
+ ep_ctx = usbssp_get_ep_ctx(usbssp_data, out_ctx, ep_index);
+ /* If the controller already knows the endpoint is disabled,
+ * or the USBSSP driver has noted it is disabled, ignore this request
+ */
+ if ((GET_EP_CTX_STATE(ep_ctx) == EP_STATE_DISABLED) ||
+ le32_to_cpu(ctrl_ctx->drop_flags) &
+ usbssp_get_endpoint_flag(dep->endpoint.desc)) {
+ /* Do not warn when called after a usb_device_reset */
+ if (usbssp_data->devs.eps[ep_index].ring != NULL)
+ usbssp_warn(usbssp_data, "USBSSP %s called with disabled ep %p\n",
+ __func__, dep);
+ return 0;
+ }
+
+ ctrl_ctx->drop_flags |= cpu_to_le32(drop_flag);
+ new_drop_flags = le32_to_cpu(ctrl_ctx->drop_flags);
+
+ ctrl_ctx->add_flags &= cpu_to_le32(~drop_flag);
+ new_add_flags = le32_to_cpu(ctrl_ctx->add_flags);
+
+// usbssp_debugfs_remove_endpoint(usbssp_data, &usbssp_data->devs,
+// ep_index);
+
+ usbssp_endpoint_zero(usbssp_data, &usbssp_data->devs, dep);
+
+ usbssp_dbg(usbssp_data, "drop ep 0x%x, new drop flags = %#x, new add flags = %#x\n",
+ (unsigned int) dep->endpoint.desc->bEndpointAddress,
+ (unsigned int) new_drop_flags,
+ (unsigned int) new_add_flags);
+ return 0;
+}
+
+/* Add an endpoint to a new possible bandwidth configuration for this device.
+ * Only one call to this function is allowed per endpoint before
+ * check_bandwidth() or reset_bandwidth() must be called.
+ * A call to usbssp_drop_endpoint() followed by a call to
+ * usbssp_add_endpoint() will add the endpoint to the schedule with possibly
+ * new parameters denoted by different endpoint descriptor in usbssp_ep.
+ * A call to usbssp_add_endpoint() followed by a call to usbssp_drop_endpoint()
+ * is not allowed.
+ *
+ */
+int usbssp_add_endpoint(struct usbssp_udc *usbssp_data, struct usbssp_ep *dep)
+{
+ const struct usb_endpoint_descriptor *desc = dep->endpoint.desc;
+ struct usbssp_container_ctx *in_ctx;
+ unsigned int ep_index;
+ struct usbssp_input_control_ctx *ctrl_ctx;
+ u32 added_ctxs;
+ u32 new_add_flags, new_drop_flags;
+ struct usbssp_device *dev_priv;
+ int ret = 0;
+
+ ret = usbssp_check_args(usbssp_data, dep, 1, true, __func__);
+ if (ret <= 0)
+ return ret;
+
+ if (usbssp_data->usbssp_state & USBSSP_STATE_DYING)
+ return -ENODEV;
+
+ added_ctxs = usbssp_get_endpoint_flag(desc);
+ if (added_ctxs == SLOT_FLAG || added_ctxs == EP0_FLAG) {
+ usbssp_dbg(usbssp_data, "USBSSP %s - can't add slot or ep 0 %#x\n",
+ __func__, added_ctxs);
+ return 0;
+ }
+
+ dev_priv = &usbssp_data->devs;
+ in_ctx = dev_priv->in_ctx;
+ ctrl_ctx = usbssp_get_input_control_ctx(in_ctx);
+ if (!ctrl_ctx) {
+ usbssp_warn(usbssp_data, "%s: Could not get input context, bad type.\n",
+ __func__);
+ return 0;
+ }
+
+ ep_index = usbssp_get_endpoint_index(desc);
+ /* If this endpoint is already in use, and the upper layers are trying
+ * to add it again without dropping it, reject the addition.
+ */
+ if (dev_priv->eps[ep_index].ring &&
+ !(le32_to_cpu(ctrl_ctx->drop_flags) & added_ctxs)) {
+ usbssp_warn(usbssp_data,
+ "Trying to add endpoint 0x%x without dropping it.\n",
+ (unsigned int) desc->bEndpointAddress);
+ return -EINVAL;
+ }
+
+ /* If already noted the endpoint is enabled,
+ * ignore this request.
+ */
+ if (le32_to_cpu(ctrl_ctx->add_flags) & added_ctxs) {
+ usbssp_warn(usbssp_data, "USBSSP %s called with enabled ep %p\n",
+ __func__, dep);
+ return 0;
+ }
+
+ if (usbssp_endpoint_init(usbssp_data, dev_priv, dep, GFP_ATOMIC) < 0) {
+ usbssp_dbg(usbssp_data, "%s - could not initialize ep %#x\n",
+ __func__, desc->bEndpointAddress);
+ return -ENOMEM;
+ }
+
+ ctrl_ctx->add_flags |= cpu_to_le32(added_ctxs);
+ new_add_flags = le32_to_cpu(ctrl_ctx->add_flags);
+ new_drop_flags = le32_to_cpu(ctrl_ctx->drop_flags);
+
+// usbssp_debugfs_create_endpoint(usbssp_data,
+// &usbssp_data->devs, ep_index);
+ usbssp_dbg(usbssp_data,
+ "add ep 0x%x, new drop flags = %#x, new add flags = %#x\n",
+ (unsigned int) desc->bEndpointAddress,
+ (unsigned int) new_drop_flags,
+ (unsigned int) new_add_flags);
+ return 0;
+}
+
+static void usbssp_zero_in_ctx(struct usbssp_udc *usbssp_data,
+ struct usbssp_device *dev_priv)
+{
+ struct usbssp_input_control_ctx *ctrl_ctx;
+ struct usbssp_ep_ctx *ep_ctx;
+ struct usbssp_slot_ctx *slot_ctx;
+ int i;
+
+ ctrl_ctx = usbssp_get_input_control_ctx(dev_priv->in_ctx);
+ if (!ctrl_ctx) {
+ usbssp_warn(usbssp_data,
+ "%s: Could not get input context, bad type.\n",
+ __func__);
+ return;
+ }
+
+ /* When a device's add flag and drop flag are zero, any subsequent
+ * configure endpoint command will leave that endpoint's state
+ * untouched. Make sure we don't leave any old state in the input
+ * endpoint contexts.
+ */
+ ctrl_ctx->drop_flags = 0;
+ ctrl_ctx->add_flags = 0;
+ slot_ctx = usbssp_get_slot_ctx(usbssp_data, dev_priv->in_ctx);
+ slot_ctx->dev_info &= cpu_to_le32(~LAST_CTX_MASK);
+ /* Endpoint 0 is always valid */
+ slot_ctx->dev_info |= cpu_to_le32(LAST_CTX(1));
+ for (i = 1; i < 31; ++i) {
+ ep_ctx = usbssp_get_ep_ctx(usbssp_data, dev_priv->in_ctx, i);
+ ep_ctx->ep_info = 0;
+ ep_ctx->ep_info2 = 0;
+ ep_ctx->deq = 0;
+ ep_ctx->tx_info = 0;
+ }
+}
+
+static int usbssp_configure_endpoint_result(struct usbssp_udc *usbssp_data,
+ struct usb_gadget *g,
+ u32 *cmd_status)
+{
+ int ret;
+
+ switch (*cmd_status) {
+ case COMP_COMMAND_ABORTED:
+ case COMP_COMMAND_RING_STOPPED:
+ usbssp_warn(usbssp_data,
+ "Timeout while waiting for configure endpoint command\n");
+ ret = -ETIME;
+ break;
+ case COMP_RESOURCE_ERROR:
+ dev_warn(&g->dev,
+ "Not enough device controller resources for new device state.\n");
+ ret = -ENOMEM;
+ break;
+ case COMP_TRB_ERROR:
+ /* the gadget driver set up something wrong */
+ dev_warn(&g->dev, "ERROR: Endpoint drop flag = 0, "
+ "add flag = 1, and endpoint is not disabled.\n");
+ ret = -EINVAL;
+ break;
+ case COMP_INCOMPATIBLE_DEVICE_ERROR:
+ dev_warn(&g->dev,
+ "ERROR: Incompatible device for endpoint configure command.\n");
+ ret = -ENODEV;
+ break;
+ case COMP_SUCCESS:
+ usbssp_dbg_trace(usbssp_data, trace_usbssp_dbg_context_change,
+ "Successful Endpoint Configure command");
+ ret = 0;
+ break;
+ default:
+ usbssp_err(usbssp_data,
+ "ERROR: unexpected command completion code 0x%x.\n",
+ *cmd_status);
+ ret = -EINVAL;
+ break;
+ }
+ return ret;
+}
+
+static int usbssp_evaluate_context_result(struct usbssp_udc *usbssp_data,
+ struct usb_gadget *g, u32 *cmd_status)
+{
+ int ret;
+
+ switch (*cmd_status) {
+ case COMP_COMMAND_ABORTED:
+ case COMP_COMMAND_RING_STOPPED:
+ usbssp_warn(usbssp_data,
+ "Timeout while waiting for evaluate context command\n");
+ ret = -ETIME;
+ break;
+ case COMP_PARAMETER_ERROR:
+ dev_warn(&g->dev,
+ "WARN: USBSSP driver setup invalid evaluate context command.\n");
+ ret = -EINVAL;
+ break;
+ case COMP_SLOT_NOT_ENABLED_ERROR:
+ dev_warn(&g->dev,
+ "WARN: slot not enabled for evaluate context command.\n");
+ ret = -EINVAL;
+ break;
+ case COMP_CONTEXT_STATE_ERROR:
+ dev_warn(&g->dev,
+ "WARN: invalid context state for evaluate context command.\n");
+ ret = -EINVAL;
+ break;
+ case COMP_INCOMPATIBLE_DEVICE_ERROR:
+ dev_warn(&g->dev,
+ "ERROR: Incompatible device for evaluate context command.\n");
+ ret = -ENODEV;
+ break;
+ case COMP_MAX_EXIT_LATENCY_TOO_LARGE_ERROR:
+ /* Max Exit Latency too large error */
+ dev_warn(&g->dev, "WARN: Max Exit Latency too large\n");
+ ret = -EINVAL;
+ break;
+ case COMP_SUCCESS:
+ usbssp_dbg_trace(usbssp_data, trace_usbssp_dbg_context_change,
+ "Successful evaluate context command");
+ ret = 0;
+ break;
+ default:
+ usbssp_err(usbssp_data,
+ "ERROR: unexpected command completion code 0x%x.\n",
+ *cmd_status);
+ ret = -EINVAL;
+ break;
+ }
+ return ret;
+}
+
+/* Issue a configure endpoint command or evaluate context command
+ * and wait for it to finish.
+ */
+static int usbssp_configure_endpoint(struct usbssp_udc *usbssp_data,
+ struct usb_gadget *g,
+ struct usbssp_command *command,
+ bool ctx_change, bool must_succeed)
+{
+ int ret;
+ struct usbssp_input_control_ctx *ctrl_ctx;
+ struct usbssp_device *dev_priv;
+ struct usbssp_slot_ctx *slot_ctx;
+
+ if (!command)
+ return -EINVAL;
+
+ if (usbssp_data->usbssp_state & USBSSP_STATE_DYING)
+ return -ESHUTDOWN;
+
+ dev_priv = &usbssp_data->devs;
+ ctrl_ctx = usbssp_get_input_control_ctx(command->in_ctx);
+ if (!ctrl_ctx) {
+ usbssp_warn(usbssp_data,
+ "%s: Could not get input context, bad type.\n",
+ __func__);
+ return -ENOMEM;
+ }
+
+ slot_ctx = usbssp_get_slot_ctx(usbssp_data, command->in_ctx);
+ trace_usbssp_configure_endpoint(slot_ctx);
+
+ if (!ctx_change) {
+ ret = usbssp_queue_configure_endpoint(usbssp_data, command,
+ command->in_ctx->dma, must_succeed);
+ } else {
+ ret = usbssp_queue_evaluate_context(usbssp_data, command,
+ command->in_ctx->dma, must_succeed);
+ }
+
+ if (ret < 0) {
+ usbssp_dbg_trace(usbssp_data, trace_usbssp_dbg_context_change,
+ "FIXME allocate a new ring segment");
+ return -ENOMEM;
+ }
+
+ usbssp_ring_cmd_db(usbssp_data);
+
+ spin_unlock_irqrestore(&usbssp_data->irq_thread_lock,
+ usbssp_data->irq_thread_flag);
+
+ /*Waiting for handling Endpoint Configure command */
+ while (!command->status)
+ udelay(100);
+
+ spin_lock_irqsave(&usbssp_data->irq_thread_lock,
+ usbssp_data->irq_thread_flag);
+
+ if (!ctx_change)
+ ret = usbssp_configure_endpoint_result(usbssp_data, g,
+ &command->status);
+ else
+ ret = usbssp_evaluate_context_result(usbssp_data, g,
+ &command->status);
+ return ret;
+}
+
+static void usbssp_check_bw_drop_ep_streams(struct usbssp_udc *usbssp_data,
+ struct usbssp_device *vdev, int i)
+{
+ struct usbssp_ep *ep = &vdev->eps[i];
+
+ if (ep->ep_state & EP_HAS_STREAMS) {
+ usbssp_warn(usbssp_data,
+ "WARN: endpoint 0x%02x has streams on set_interface, freeing streams.\n",
+ usbssp_get_endpoint_address(i));
+ usbssp_free_stream_info(usbssp_data, ep->stream_info);
+ ep->stream_info = NULL;
+ ep->ep_state &= ~EP_HAS_STREAMS;
+ }
+}
+
+int usbssp_halt_endpoint(struct usbssp_udc *usbssp_data, struct usbssp_ep *dep,
+ int value)
+{
+ int ret = 1;
+ struct usbssp_device *dev_priv;
+ struct usbssp_command *command;
+ unsigned int ep_index;
+ int interrupt_disabled_locally = 0;
+
+ ret = usbssp_check_args(usbssp_data, NULL, 0, true, __func__);
+ if (ret <= 0)
+ return ret;
+
+ if ((usbssp_data->usbssp_state & USBSSP_STATE_DYING) ||
+ (usbssp_data->usbssp_state & USBSSP_STATE_REMOVING))
+ return -ENODEV;
+
+ dev_priv = &usbssp_data->devs;
+ ep_index = usbssp_get_endpoint_index(dep->endpoint.desc);
+
+ command = usbssp_alloc_command(usbssp_data, true, GFP_ATOMIC);
+
+ if (!command)
+ return -ENOMEM;
+
+ if (value) {
+ dep->ep_state |= EP_HALTED;
+
+ ret = usbssp_cmd_stop_ep(usbssp_data,
+ &usbssp_data->gadget, dep);
+ if (ret < 0) {
+ usbssp_err(usbssp_data,
+ "Command Stop Endpoint failed 1\n");
+ return ret;
+ }
+
+ ret = usbssp_queue_halt_endpoint(usbssp_data, command,
+ ep_index);
+
+ if (ret < 0) {
+ usbssp_err(usbssp_data,
+ "Command Halt Endpoint failed\n");
+ goto command_cleanup;
+ }
+
+ usbssp_ring_cmd_db(usbssp_data);
+ /*wait for ep*/
+ if (irqs_disabled()) {
+ spin_unlock_irqrestore(&usbssp_data->irq_thread_lock,
+ usbssp_data->irq_thread_flag);
+ interrupt_disabled_locally = 1;
+ } else {
+ spin_unlock(&usbssp_data->irq_thread_lock);
+ }
+
+ /* Wait for last stop endpoint command to finish */
+ wait_for_completion(command->completion);
+
+ if (interrupt_disabled_locally)
+ spin_lock_irqsave(&usbssp_data->irq_thread_lock,
+ usbssp_data->irq_thread_flag);
+ else
+ spin_lock(&usbssp_data->irq_thread_lock);
+
+
+ } else {
+ struct usbssp_td *td;
+
+ /* Issue a reset endpoint command to clear the device side
+ * halt, followed by a set dequeue command to move the
+ * dequeue pointer past the TD.
+ */
+ td = list_first_entry(&dep->ring->td_list, struct usbssp_td,
+ td_list);
+
+ usbssp_cleanup_halted_endpoint(usbssp_data, ep_index,
+ dep->ring->stream_id, td, EP_HARD_RESET);
+
+ goto command_cleanup;
+ }
+
+ ret = command->status;
+
+ switch (ret) {
+ case COMP_COMMAND_ABORTED:
+ case COMP_COMMAND_RING_STOPPED:
+ usbssp_warn(usbssp_data,
+ "Timeout waiting for Halt Endpoint command\n");
+ ret = -ETIME;
+ goto command_cleanup;
+ case COMP_SUCCESS:
+ usbssp_dbg(usbssp_data, "Successful Halt Endpoint command.\n");
+ break;
+ default:
+ if (usbssp_is_vendor_info_code(usbssp_data, ret))
+ break;
+ usbssp_warn(usbssp_data, "Unknown completion code %u for "
+ "Halt Endpoint command.\n", ret);
+ ret = -EINVAL;
+ goto command_cleanup;
+ }
+
+command_cleanup:
+ kfree(command->completion);
+ kfree(command);
+ return ret;
+}
+
+/* Called after one or more calls to usbssp_add_endpoint() or
+ * usbssp_drop_endpoint(). If this call fails, the driver is expected
+ * to call usbssp_reset_bandwidth().
+ *
+ */
+int usbssp_check_bandwidth(struct usbssp_udc *usbssp_data, struct usb_gadget *g)
+{
+ int i;
+ int ret = 0;
+ struct usbssp_device *dev_priv;
+ struct usbssp_input_control_ctx *ctrl_ctx;
+ struct usbssp_slot_ctx *slot_ctx;
+ struct usbssp_command *command;
+
+ ret = usbssp_check_args(usbssp_data, NULL, 0, true, __func__);
+ if (ret <= 0)
+ return ret;
+
+ if ((usbssp_data->usbssp_state & USBSSP_STATE_DYING) ||
+ (usbssp_data->usbssp_state & USBSSP_STATE_REMOVING))
+ return -ENODEV;
+
+ dev_priv = &usbssp_data->devs;
+
+ command = usbssp_alloc_command(usbssp_data, true, GFP_ATOMIC);
+ if (!command)
+ return -ENOMEM;
+
+ command->in_ctx = dev_priv->in_ctx;
+
+ ctrl_ctx = usbssp_get_input_control_ctx(command->in_ctx);
+ if (!ctrl_ctx) {
+ usbssp_warn(usbssp_data,
+ "%s: Could not get input context, bad type.\n",
+ __func__);
+ ret = -ENOMEM;
+ goto command_cleanup;
+ }
+ ctrl_ctx->add_flags |= cpu_to_le32(SLOT_FLAG);
+ ctrl_ctx->add_flags &= cpu_to_le32(~EP0_FLAG);
+ ctrl_ctx->drop_flags &= cpu_to_le32(~(SLOT_FLAG | EP0_FLAG));
+
+ /* Don't issue the command if there's no endpoints to update.*/
+ if (ctrl_ctx->add_flags == cpu_to_le32(SLOT_FLAG) &&
+ ctrl_ctx->drop_flags == 0) {
+ ret = 0;
+ goto command_cleanup;
+ }
+
+ /* Fix up Context Entries field. Minimum value is EP0 == BIT(1). */
+ slot_ctx = usbssp_get_slot_ctx(usbssp_data, dev_priv->in_ctx);
+ for (i = 31; i >= 1; i--) {
+ __le32 le32 = cpu_to_le32(BIT(i));
+
+ if ((dev_priv->eps[i-1].ring && !(ctrl_ctx->drop_flags & le32))
+ || (ctrl_ctx->add_flags & le32) || i == 1) {
+ slot_ctx->dev_info &= cpu_to_le32(~LAST_CTX_MASK);
+ slot_ctx->dev_info |= cpu_to_le32(LAST_CTX(i));
+ break;
+ }
+ }
+
+ usbssp_dbg(usbssp_data, "New Input Control Context:\n");
+ usbssp_dbg_ctx(usbssp_data, dev_priv->in_ctx,
+ LAST_CTX_TO_EP_NUM(le32_to_cpu(slot_ctx->dev_info)));
+
+ ret = usbssp_configure_endpoint(usbssp_data, g, command,
+ false, false);
+
+ if (ret)
+ /* Caller should call reset_bandwidth() */
+ goto command_cleanup;
+
+ usbssp_dbg(usbssp_data, "Output CTX after successful config ep cmd:\n");
+ usbssp_dbg_ctx(usbssp_data, dev_priv->out_ctx,
+ LAST_CTX_TO_EP_NUM(le32_to_cpu(slot_ctx->dev_info)));
+
+ /* Free any rings that were dropped, but not changed. */
+ for (i = 1; i < 31; ++i) {
+ if ((le32_to_cpu(ctrl_ctx->drop_flags) & (1 << (i + 1))) &&
+ !(le32_to_cpu(ctrl_ctx->add_flags) & (1 << (i + 1)))) {
+ usbssp_free_endpoint_ring(usbssp_data, dev_priv, i);
+ usbssp_check_bw_drop_ep_streams(usbssp_data,
+ dev_priv, i);
+ }
+ }
+
+ usbssp_zero_in_ctx(usbssp_data, dev_priv);
+ /*
+ * Install any rings for completely new endpoints or changed endpoints,
+ * and free any old rings from changed endpoints.
+ */
+ for (i = 1; i < 31; ++i) {
+ if (!dev_priv->eps[i].new_ring)
+ continue;
+ /* Only free the old ring if it exists.
+ * It may not if this is the first add of an endpoint.
+ */
+ if (dev_priv->eps[i].ring)
+ usbssp_free_endpoint_ring(usbssp_data, dev_priv, i);
+
+ usbssp_check_bw_drop_ep_streams(usbssp_data, dev_priv, i);
+ dev_priv->eps[i].ring = dev_priv->eps[i].new_ring;
+ dev_priv->eps[i].new_ring = NULL;
+ }
+command_cleanup:
+ kfree(command->completion);
+ kfree(command);
+ return ret;
+}
+
+void usbssp_reset_bandwidth(struct usbssp_udc *usbssp_data,
+ struct usb_gadget *g)
+{
+ struct usbssp_device *dev_priv;
+ int i, ret;
+
+ ret = usbssp_check_args(usbssp_data, NULL, 0, true, __func__);
+ if (ret <= 0)
+ return;
+
+ dev_priv = &usbssp_data->devs;
+ /* Free any rings allocated for added endpoints */
+ for (i = 0; i < 31; ++i) {
+ if (dev_priv->eps[i].new_ring) {
+ usbssp_debugfs_remove_endpoint(usbssp_data,
+ dev_priv, i);
+ usbssp_ring_free(usbssp_data,
+ dev_priv->eps[i].new_ring);
+ dev_priv->eps[i].new_ring = NULL;
+ }
+ }
+ usbssp_zero_in_ctx(usbssp_data, dev_priv);
+}
+
+void usbssp_cleanup_stalled_ring(struct usbssp_udc *usbssp_data,
+ unsigned int ep_index,
+ unsigned int stream_id,
+ struct usbssp_td *td)
+{
+ struct usbssp_dequeue_state deq_state;
+ struct usbssp_ep *ep_priv;
+
+ usbssp_dbg_trace(usbssp_data, trace_usbssp_dbg_reset_ep,
+ "Cleaning up stalled endpoint ring");
+ ep_priv = &usbssp_data->devs.eps[ep_index];
+
+ /* We need to move the HW's dequeue pointer past this TD,
+ * or it will attempt to resend it on the next doorbell ring.
+ */
+ usbssp_find_new_dequeue_state(usbssp_data,
+ ep_index, stream_id, td, &deq_state);
+
+ if (!deq_state.new_deq_ptr || !deq_state.new_deq_seg)
+ return;
+
+ usbssp_dbg_trace(usbssp_data, trace_usbssp_dbg_reset_ep,
+ "Queueing new dequeue state");
+ usbssp_queue_new_dequeue_state(usbssp_data,
+ ep_index, &deq_state);
+}
+
+/*
+ * This submits a Reset Device Command, which will set the device state to 0,
+ * set the device address to 0, and disable all the endpoints except the default
+ * control endpoint. The USB core should come back and call
+ * usbssp_address_device(), and then re-set up the configuration.
+ *
+ * Wait for the Reset Device command to finish. Remove all structures
+ * associated with the endpoints that were disabled. Clear the input device
+ * structure? Reset the control endpoint 0 max packet size?
+ */
+int usbssp_reset_device(struct usbssp_udc *usbssp_data)
+{
+ struct usbssp_device *dev_priv;
+ struct usbssp_command *reset_device_cmd;
+ int last_freed_endpoint = 0;
+ struct usbssp_slot_ctx *slot_ctx;
+ int slot_state;
+ int ret = 0;
+
+ ret = usbssp_check_args(usbssp_data, NULL, 0, false, __func__);
+ if (ret <= 0)
+ return ret;
+
+ dev_priv = &usbssp_data->devs;
+
+ /* If device is not setup, there is no point in resetting it */
+ slot_ctx = usbssp_get_slot_ctx(usbssp_data, dev_priv->out_ctx);
+ slot_state = GET_SLOT_STATE(le32_to_cpu(slot_ctx->dev_state));
+ pr_info("usbssp_reset_deviceslot_stated\n");
+ if (slot_state == SLOT_STATE_DISABLED ||
+ slot_state == SLOT_STATE_ENABLED ||
+ slot_state == SLOT_STATE_DEFAULT) {
+ usbssp_dbg(usbssp_data,
+ "Slot in DISABLED/ENABLED state - reset not allowed\n");
+ return 0;
+ }
+
+ trace_usbssp_reset_device(slot_ctx);
+
+ usbssp_dbg(usbssp_data, "Resetting device with slot ID %u\n",
+ usbssp_data->slot_id);
+ /* Allocate the command structure that holds the struct completion.
+ */
+ reset_device_cmd = usbssp_alloc_command(usbssp_data, true, GFP_ATOMIC);
+
+ if (!reset_device_cmd) {
+ usbssp_dbg(usbssp_data,
+ "Couldn't allocate command structure.\n");
+ return -ENOMEM;
+ }
+
+ /* Attempt to submit the Reset Device command to the command ring */
+ ret = usbssp_queue_reset_device(usbssp_data, reset_device_cmd);
+ if (ret) {
+ usbssp_dbg(usbssp_data,
+ "FIXME: allocate a command ring segment\n");
+ goto command_cleanup;
+ }
+ usbssp_ring_cmd_db(usbssp_data);
+
+ spin_unlock_irqrestore(&usbssp_data->irq_thread_lock,
+ usbssp_data->irq_thread_flag);
+
+ /* Wait for the Reset Device command to finish */
+ wait_for_completion(reset_device_cmd->completion);
+ spin_lock_irqsave(&usbssp_data->irq_thread_lock,
+ usbssp_data->irq_thread_flag);
+
+ /* The Reset Device command can't fail, according to spec,
+ * unless we tried to reset a slot ID that wasn't enabled,
+ * or the device wasn't in the addressed or configured state.
+ */
+ ret = reset_device_cmd->status;
+ switch (ret) {
+ case COMP_COMMAND_ABORTED:
+ case COMP_COMMAND_RING_STOPPED:
+ usbssp_warn(usbssp_data,
+ "Timeout waiting for reset device command\n");
+ ret = -ETIME;
+ goto command_cleanup;
+ case COMP_SLOT_NOT_ENABLED_ERROR: /*completion code for bad slot ID */
+ case COMP_CONTEXT_STATE_ERROR: /* completion code for same thing */
+ usbssp_dbg(usbssp_data,
+ "Can't reset device (slot ID %u) in %s state\n",
+ usbssp_data->slot_id,
+ usbssp_get_slot_state(usbssp_data,
+ dev_priv->out_ctx));
+ usbssp_dbg(usbssp_data, "Not freeing device rings.\n");
+ ret = 0;
+ goto command_cleanup;
+ case COMP_SUCCESS:
+ usbssp_dbg(usbssp_data, "Successful reset device command.\n");
+ break;
+ default:
+ usbssp_warn(usbssp_data, "Unknown completion code %u for "
+ "reset device command.\n", ret);
+ ret = -EINVAL;
+ goto command_cleanup;
+ }
+
+ usbssp_dbg(usbssp_data,
+ "Output context after successful reset device cmd:\n");
+ usbssp_dbg_ctx(usbssp_data, dev_priv->out_ctx, last_freed_endpoint);
+ ret = 0;
+
+command_cleanup:
+ usbssp_free_command(usbssp_data, reset_device_cmd);
+ return ret;
+}
+
+/*
+ * At this point, the struct usb_device is about to go away, the device has
+ * disconnected, and all traffic has been stopped and the endpoints have been
+ * disabled. Free any DC data structures associated with that device.
+ */
+void usbssp_free_dev(struct usbssp_udc *usbssp_data)
+{
+ struct usbssp_device *priv_dev;
+ int i, ret;
+ struct usbssp_slot_ctx *slot_ctx;
+
+ priv_dev = &usbssp_data->devs;
+ slot_ctx = usbssp_get_slot_ctx(usbssp_data, priv_dev->out_ctx);
+ trace_usbssp_free_dev(slot_ctx);
+
+ for (i = 0; i < 31; ++i)
+ priv_dev->eps[i].ep_state &= ~EP_STOP_CMD_PENDING;
+
+// usbssp_debugfs_remove_slot(usbssp_data, usbssp_data->slot_id);
+ ret = usbssp_disable_slot(usbssp_data);
+ if (ret)
+ usbssp_free_priv_device(usbssp_data);
+}
+
+int usbssp_disable_slot(struct usbssp_udc *usbssp_data)
+{
+ struct usbssp_command *command;
+ u32 state;
+ int ret = 0;
+
+ command = usbssp_alloc_command(usbssp_data, false, GFP_ATOMIC);
+ if (!command)
+ return -ENOMEM;
+
+ /* Don't disable the slot if the device controller is dead. */
+ state = readl(&usbssp_data->op_regs->status);
+ if (state == 0xffffffff ||
+ (usbssp_data->usbssp_state & USBSSP_STATE_DYING) ||
+ (usbssp_data->usbssp_state & USBSSP_STATE_HALTED)) {
+ kfree(command);
+ return -ENODEV;
+ }
+
+ ret = usbssp_queue_slot_control(usbssp_data, command, TRB_DISABLE_SLOT);
+ if (ret) {
+ kfree(command);
+ return ret;
+ }
+ usbssp_ring_cmd_db(usbssp_data);
+ return ret;
+}
+
+/*
+ * Returns 0 if the DC n out of device slots, the Enable Slot command
+ * timed out, or allocating memory failed. Returns 1 on success.
+ */
+int usbssp_alloc_dev(struct usbssp_udc *usbssp_data)
+{
+ int ret, slot_id;
+ struct usbssp_command *command;
+ struct usbssp_slot_ctx *slot_ctx;
+
+ command = usbssp_alloc_command(usbssp_data, true, GFP_ATOMIC);
+
+ if (!command)
+ return -ENOMEM;
+
+ ret = usbssp_queue_slot_control(usbssp_data, command, TRB_ENABLE_SLOT);
+
+ if (ret) {
+ usbssp_free_command(usbssp_data, command);
+ return ret;
+ }
+
+ usbssp_ring_cmd_db(usbssp_data);
+ spin_unlock_irqrestore(&usbssp_data->irq_thread_lock,
+ usbssp_data->irq_thread_flag);
+ wait_for_completion(command->completion);
+ spin_lock_irqsave(&usbssp_data->irq_thread_lock,
+ usbssp_data->irq_thread_flag);
+
+ slot_id = usbssp_data->slot_id;
+
+ if (!slot_id || command->status != COMP_SUCCESS) {
+ usbssp_err(usbssp_data,
+ "Error while assigning device slot ID\n");
+ usbssp_free_command(usbssp_data, command);
+ return 0;
+ }
+
+ usbssp_free_command(usbssp_data, command);
+
+ if (!usbssp_alloc_priv_device(usbssp_data, GFP_ATOMIC)) {
+ usbssp_warn(usbssp_data,
+ "Could not allocate usbssp_device data structures\n");
+ goto disable_slot;
+ }
+
+ slot_ctx = usbssp_get_slot_ctx(usbssp_data, usbssp_data->devs.out_ctx);
+ trace_usbssp_alloc_dev(slot_ctx);
+
+// usbssp_debugfs_create_slot(usbssp_data, slot_id);
+
+ return 1;
+
+disable_slot:
+ ret = usbssp_disable_slot(usbssp_data);
+ if (ret)
+ usbssp_free_priv_device(usbssp_data);
+
+ return 0;
+}
+
+/*
+ * Issue an Address Device command
+ */
+static int usbssp_setup_device(struct usbssp_udc *usbssp_data,
+ enum usbssp_setup_dev setup)
+{
+ const char *act = setup == SETUP_CONTEXT_ONLY ? "context" : "address";
+ struct usbssp_device *dev_priv;
+ int ret = 0;
+ struct usbssp_slot_ctx *slot_ctx;
+ struct usbssp_input_control_ctx *ctrl_ctx;
+ u64 temp_64;
+ struct usbssp_command *command = NULL;
+ int dev_state = 0;
+ int slot_id = usbssp_data->slot_id;
+
+ if (usbssp_data->usbssp_state) {/* dying, removing or halted */
+ ret = -ESHUTDOWN;
+ goto out;
+ }
+
+ if (!slot_id) {
+ usbssp_dbg_trace(usbssp_data, trace_usbssp_dbg_address,
+ "Bad Slot ID %d", slot_id);
+ ret = -EINVAL;
+ goto out;
+ }
+
+ dev_priv = &usbssp_data->devs;
+
+ slot_ctx = usbssp_get_slot_ctx(usbssp_data, dev_priv->out_ctx);
+ trace_usbssp_setup_device_slot(slot_ctx);
+
+ dev_state = GET_SLOT_STATE(le32_to_cpu(slot_ctx->dev_state));
+
+ if (setup == SETUP_CONTEXT_ONLY) {
+ if (dev_state == SLOT_STATE_DEFAULT) {
+ usbssp_dbg(usbssp_data,
+ "Slot already in default state\n");
+ goto out;
+ }
+ }
+
+ command = usbssp_alloc_command(usbssp_data, true, GFP_ATOMIC);
+ if (!command) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ command->in_ctx = dev_priv->in_ctx;
+
+ slot_ctx = usbssp_get_slot_ctx(usbssp_data, dev_priv->in_ctx);
+ ctrl_ctx = usbssp_get_input_control_ctx(dev_priv->in_ctx);
+
+ if (!ctrl_ctx) {
+ usbssp_warn(usbssp_data,
+ "%s: Could not get input context, bad type.\n",
+ __func__);
+ ret = -EINVAL;
+ goto out;
+ }
+
+ /*
+ * If this is the first Set Address (BSR=0) or driver trays
+ * transition to Default (BSR=1) since device plug-in or
+ * priv device reallocation after a resume with an USBSSP power loss,
+ * then set up the slot context or update device address in slot
+ * context.
+ */
+ if (!slot_ctx->dev_info || dev_state == SLOT_STATE_DEFAULT)
+ usbssp_setup_addressable_priv_dev(usbssp_data);
+
+ if (dev_state == SLOT_STATE_DEFAULT)
+ usbssp_copy_ep0_dequeue_into_input_ctx(usbssp_data);
+
+ ctrl_ctx->add_flags = cpu_to_le32(SLOT_FLAG | EP0_FLAG);
+ ctrl_ctx->drop_flags = 0;
+
+ usbssp_dbg(usbssp_data, "Slot ID %d Input Context:\n", slot_id);
+ usbssp_dbg_ctx(usbssp_data, dev_priv->in_ctx, 2);
+ trace_usbssp_address_ctx(usbssp_data, dev_priv->in_ctx,
+ le32_to_cpu(slot_ctx->dev_info) >> 27);
+
+ ret = usbssp_queue_address_device(usbssp_data, command,
+ dev_priv->in_ctx->dma, setup);
+
+ if (ret) {
+ usbssp_dbg_trace(usbssp_data, trace_usbssp_dbg_address,
+ "Prabably command ring segment is full");
+ goto out;
+ }
+
+ usbssp_ring_cmd_db(usbssp_data);
+
+ spin_unlock_irqrestore(&usbssp_data->irq_thread_lock,
+ usbssp_data->irq_thread_flag);
+ wait_for_completion(command->completion);
+ spin_lock_irqsave(&usbssp_data->irq_thread_lock,
+ usbssp_data->irq_thread_flag);
+
+ switch (command->status) {
+ case COMP_COMMAND_ABORTED:
+ case COMP_COMMAND_RING_STOPPED:
+ usbssp_warn(usbssp_data,
+ "Timeout while waiting for setup device command\n");
+ ret = -ETIME;
+ break;
+ case COMP_CONTEXT_STATE_ERROR:
+ case COMP_SLOT_NOT_ENABLED_ERROR:
+ usbssp_err(usbssp_data,
+ "Setup ERROR: setup %s command for slot %d.\n",
+ act, slot_id);
+ ret = -EINVAL;
+ break;
+ case COMP_INCOMPATIBLE_DEVICE_ERROR:
+ dev_warn(usbssp_data->dev,
+ "ERROR: Incompatible device for setup %s command\n",
+ act);
+ ret = -ENODEV;
+ break;
+ case COMP_SUCCESS:
+ usbssp_dbg_trace(usbssp_data, trace_usbssp_dbg_address,
+ "Successful setup %s command", act);
+ break;
+ default:
+ usbssp_err(usbssp_data,
+ "ERROR: unexpected setup %s command completion code 0x%x.\n",
+ act, command->status);
+ usbssp_dbg(usbssp_data, "Slot ID %d Output Context:\n",
+ slot_id);
+ usbssp_dbg_ctx(usbssp_data, dev_priv->out_ctx, 2);
+ trace_usbssp_address_ctx(usbssp_data, dev_priv->out_ctx, 1);
+ ret = -EINVAL;
+ break;
+ }
+
+ if (ret)
+ goto out;
+
+ temp_64 = usbssp_read_64(usbssp_data, &usbssp_data->op_regs->dcbaa_ptr);
+ usbssp_dbg_trace(usbssp_data, trace_usbssp_dbg_address,
+ "Op regs DCBAA ptr = %#016llx", temp_64);
+ usbssp_dbg_trace(usbssp_data, trace_usbssp_dbg_address,
+ "Slot ID %d dcbaa entry @%p = %#016llx",
+ slot_id, &usbssp_data->dcbaa->dev_context_ptrs[slot_id],
+ (unsigned long long)
+ le64_to_cpu(usbssp_data->dcbaa->dev_context_ptrs[slot_id]));
+ usbssp_dbg_trace(usbssp_data, trace_usbssp_dbg_address,
+ "Output Context DMA address = %#08llx",
+ (unsigned long long)dev_priv->out_ctx->dma);
+
+ trace_usbssp_address_ctx(usbssp_data, dev_priv->in_ctx,
+ le32_to_cpu(slot_ctx->dev_info) >> 27);
+ usbssp_dbg(usbssp_data, "Slot ID %d Output Context:\n", slot_id);
+ usbssp_dbg_ctx(usbssp_data, dev_priv->out_ctx, 2);
+
+ slot_ctx = usbssp_get_slot_ctx(usbssp_data, dev_priv->out_ctx);
+ trace_usbssp_address_ctx(usbssp_data, dev_priv->out_ctx,
+ le32_to_cpu(slot_ctx->dev_info) >> 27);
+ /* Zero the input context control for later use */
+ ctrl_ctx->add_flags = 0;
+ ctrl_ctx->drop_flags = 0;
+
+ usbssp_dbg_trace(usbssp_data, trace_usbssp_dbg_address,
+ "Internal device address = %d",
+ le32_to_cpu(slot_ctx->dev_state) & DEV_ADDR_MASK);
+
+ if (setup == SETUP_CONTEXT_ADDRESS)
+ usbssp_status_stage(usbssp_data);
+out:
+ if (command) {
+ kfree(command->completion);
+ kfree(command);
+ }
+ return ret;
+}
+
+int usbssp_address_device(struct usbssp_udc *usbssp_data)
+{
+ return usbssp_setup_device(usbssp_data, SETUP_CONTEXT_ADDRESS);
+}
+
+int usbssp_enable_device(struct usbssp_udc *usbssp_data)
+{
+ return usbssp_setup_device(usbssp_data, SETUP_CONTEXT_ONLY);
+}
+
+int usbssp_set_usb2_hardware_lpm(struct usbssp_udc *usbssp_data,
+ struct usb_request *req, int enable)
+{
+ __le32 __iomem *pm_addr;
+ u32 pm_val, field;
+ int besl;
+
+ struct usb_ext_cap_descriptor *usb_ext = req->buf + USB_DT_BOS_SIZE;
+
+ if (usbssp_data->port_major_revision >= 3 ||
+ !usbssp_data->hw_lpm_support
+ /*|| !usbssp_data->gadget->lpm_capable*/)
+ return -EPERM;
+
+ if (usb_ext->bDescriptorType != USB_DT_DEVICE_CAPABILITY ||
+ usb_ext->bDevCapabilityType != USB_CAP_TYPE_EXT) {
+ return -EPERM;
+ }
+ pm_addr = usbssp_data->usb2_ports + PORTPMSC;
+ pm_val = readl(pm_addr);
+ field = le32_to_cpu(usb_ext->bmAttributes);
+
+ //workaround for LPM - will be removed in feature.
+ field &= ~(USB_BESL_SUPPORT | USB_LPM_SUPPORT);
+ usb_ext->bmAttributes = field;
+
+ usbssp_dbg(usbssp_data, "%s port %d USB2 hardware LPM\n",
+ enable ? "enable" : "disable", usbssp_data->devs.port_num);
+
+ if (enable) {
+ /* if device doesn't have a preferred BESL value use a
+ * default one . See USBSSP_DEFAULT_BESL definition in gadget.h
+ */
+ if ((field & USB_BESL_SUPPORT) &&
+ (field & USB_BESL_BASELINE_VALID))
+ besl = USB_GET_BESL_BASELINE(field);
+ else
+ besl = USBSSP_DEFAULT_BESL;
+
+ pm_val &= ~(PORT_BESL_MASK | PORT_HLE_MASK);
+ pm_val |= PORT_RBESL(besl) | PORT_HLE | 3 /*L1S set to 3*/;
+ pr_err("usbssp_set_usb2_hardware_lpm7 %08x\n", pm_val);
+ writel(pm_val, pm_addr);
+ /* flush write */
+ readl(pm_addr);
+ } else {
+ pm_val &= ~(PORT_HLE | PORT_BESL_MASK | PORT_L1S_MASK);
+ pm_val |= PORT_L1S_HLE0_STALL;
+ writel(pm_val, pm_addr);
+ }
+ return 0;
+}
+
+int usbssp_get_frame(struct usbssp_udc *usbssp_data)
+{
+ return readl(&usbssp_data->run_regs->microframe_index) >> 3;
+}
+
+int usbssp_gen_setup(struct usbssp_udc *usbssp_data)
+{
+ int retval;
+
+ mutex_init(&usbssp_data->mutex);
+
+ usbssp_data->cap_regs = usbssp_data->regs;
+ usbssp_data->op_regs = usbssp_data->regs +
+ HC_LENGTH(readl(&usbssp_data->cap_regs->hc_capbase));
+
+ usbssp_data->run_regs = usbssp_data->regs +
+ (readl(&usbssp_data->cap_regs->run_regs_off) & RTSOFF_MASK);
+ /* Cache read-only capability registers */
+ usbssp_data->hcs_params1 = readl(&usbssp_data->cap_regs->hcs_params1);
+ usbssp_data->hcs_params2 = readl(&usbssp_data->cap_regs->hcs_params2);
+ usbssp_data->hcs_params3 = readl(&usbssp_data->cap_regs->hcs_params3);
+ usbssp_data->hcc_params = readl(&usbssp_data->cap_regs->hc_capbase);
+ usbssp_data->hci_version = HC_VERSION(usbssp_data->hcc_params);
+ usbssp_data->hcc_params = readl(&usbssp_data->cap_regs->hcc_params);
+ usbssp_data->hcc_params2 = readl(&usbssp_data->cap_regs->hcc_params2);
+ usbssp_print_registers(usbssp_data);
+
+ /* Make sure the Device Controller is halted. */
+ retval = usbssp_halt(usbssp_data);
+ if (retval)
+ return retval;
+
+ usbssp_dbg(usbssp_data, "Resetting Device Controller\n");
+ /* Reset the internal DC memory state and registers. */
+ retval = usbssp_reset(usbssp_data);
+ if (retval)
+ return retval;
+ usbssp_dbg(usbssp_data, "Reset complete\n");
+
+ /* Set dma_mask and coherent_dma_mask to 64-bits,
+ * if USBSSP supports 64-bit addressing
+ */
+ if (HCC_64BIT_ADDR(usbssp_data->hcc_params) &&
+ !dma_set_mask(usbssp_data->dev, DMA_BIT_MASK(64))) {
+ usbssp_dbg(usbssp_data, "Enabling 64-bit DMA addresses.\n");
+ dma_set_coherent_mask(usbssp_data->dev, DMA_BIT_MASK(64));
+ } else {
+ /*
+ * This is to avoid error in cases where a 32-bit USB
+ * controller is used on a 64-bit capable system.
+ */
+ retval = dma_set_mask(usbssp_data->dev, DMA_BIT_MASK(32));
+ if (retval)
+ return retval;
+ usbssp_dbg(usbssp_data, "Enabling 32-bit DMA addresses.\n");
+ dma_set_coherent_mask(usbssp_data->dev, DMA_BIT_MASK(32));
+ }
+
+ usbssp_dbg(usbssp_data, "Calling USBSSP init\n");
+ /* Initialize USBSSP controller data structures. */
+ retval = usbssp_init(usbssp_data);
+ if (retval)
+ return retval;
+ usbssp_dbg(usbssp_data, "Called USBSSPinit\n");
+
+ usbssp_info(usbssp_data, "USBSSP params 0x%08x USBSSP version 0x%x\n",
+ usbssp_data->hcc_params, usbssp_data->hci_version);
+
+ return 0;
+}
+
+/*
+ * gadget-if.c file is part of gadget.c file and implements interface
+ * for gadget driver
+ */
+#include "gadget-if.c"
+
+int usbssp_gadget_init(struct usbssp_udc *usbssp_data)
+{
+ int ret;
+
+ /*
+ * Check the compiler generated sizes of structures that must be laid
+ * out in specific ways for hardware access.
+ */
+ BUILD_BUG_ON(sizeof(struct usbssp_doorbell_array) != 2*32/8);
+ BUILD_BUG_ON(sizeof(struct usbssp_slot_ctx) != 8*32/8);
+ BUILD_BUG_ON(sizeof(struct usbssp_ep_ctx) != 8*32/8);
+ /* usbssp_device has eight fields, and also
+ * embeds one usbssp_slot_ctx and 31 usbssp_ep_ctx
+ */
+ BUILD_BUG_ON(sizeof(struct usbssp_stream_ctx) != 4*32/8);
+ BUILD_BUG_ON(sizeof(union usbssp_trb) != 4*32/8);
+ BUILD_BUG_ON(sizeof(struct usbssp_erst_entry) != 4*32/8);
+ BUILD_BUG_ON(sizeof(struct usbssp_cap_regs) != 8*32/8);
+ BUILD_BUG_ON(sizeof(struct usbssp_intr_reg) != 8*32/8);
+ /* usbssp_run_regs has eight fields and embeds 128 usbssp_intr_regs */
+ BUILD_BUG_ON(sizeof(struct usbssp_run_regs) != (8+8*128)*32/8);
+
+ /* fill gadget fields */
+ usbssp_data->gadget.ops = &usbssp_gadget_ops;
+ usbssp_data->gadget.name = "usbssp-gadget";
+ usbssp_data->gadget.max_speed = USB_SPEED_SUPER_PLUS;
+ usbssp_data->gadget.speed = USB_SPEED_UNKNOWN;
+ usbssp_data->gadget.sg_supported = true;
+// usbssp_data->gadget.lpm_capable = 1;
+
+ usbssp_data->setup_buf = kzalloc(USBSSP_EP0_SETUP_SIZE, GFP_KERNEL);
+ if (!usbssp_data->setup_buf)
+ return -ENOMEM;
+
+// usbssp_debugfs_create_root();
+
+ /*USBSSP support not aligned buffer but this option
+ * improve performance of this controller.
+ */
+ usbssp_data->gadget.quirk_ep_out_aligned_size = true;
+ ret = usbssp_gen_setup(usbssp_data);
+ if (ret < 0) {
+ usbssp_err(usbssp_data,
+ "Generic initialization failed with error code%d\n",
+ ret);
+ goto err3;
+ }
+
+ ret = usbssp_gadget_init_endpoint(usbssp_data);
+ if (ret < 0) {
+ usbssp_err(usbssp_data, "failed to initialize endpoints\n");
+ goto err1;
+ }
+
+ ret = usb_add_gadget_udc(usbssp_data->dev, &usbssp_data->gadget);
+
+ if (ret) {
+ usbssp_err(usbssp_data, "failed to register udc\n");
+ goto err2;
+ }
+
+ return ret;
+err2:
+ usbssp_gadget_free_endpoint(usbssp_data);
+err1:
+ usbssp_halt(usbssp_data);
+ usbssp_reset(usbssp_data);
+ usbssp_mem_cleanup(usbssp_data);
+err3:
+ usbssp_debugfs_remove_root();
+ return ret;
+}
+
+int usbssp_gadget_exit(struct usbssp_udc *usbssp_data)
+{
+ int ret = 0;
+
+ usb_del_gadget_udc(&usbssp_data->gadget);
+ usbssp_gadget_free_endpoint(usbssp_data);
+ usbssp_stop(usbssp_data);
+ usbssp_debugfs_remove_root();
+ return ret;
+}
+
+/**NOP command - for testing purpose*/
+int usbssp_nop_test(struct usbssp_udc *usbssp_data)
+{
+ struct usbssp_command *nop_cmd;
+ int ret = 0;
+
+ ret = usbssp_check_args(usbssp_data, NULL, 0, false, __func__);
+ if (ret <= 0)
+ return ret;
+
+ usbssp_dbg(usbssp_data, "Test: NOP command\n");
+
+ /* Allocate the command structure that holds the struct completion.
+ */
+ nop_cmd = usbssp_alloc_command(usbssp_data, true, GFP_NOIO);
+ if (!nop_cmd) {
+ usbssp_dbg(usbssp_data,
+ "Couldn't allocate command structure.\n");
+ return -ENOMEM;
+ }
+
+ ret = usbssp_queue_nop(usbssp_data, nop_cmd);
+ if (ret)
+ goto command_cleanup;
+
+ usbssp_ring_cmd_db(usbssp_data);
+ spin_unlock_irqrestore(&usbssp_data->irq_thread_lock,
+ usbssp_data->irq_thread_flag);
+
+ /* Wait for the Reset Device command to finish */
+ wait_for_completion(nop_cmd->completion);
+ spin_lock_irqsave(&usbssp_data->irq_thread_lock,
+ usbssp_data->irq_thread_flag);
+
+ /* The NOP command can't fail*/
+ ret = nop_cmd->status;
+ switch (ret) {
+ case COMP_SUCCESS:
+ usbssp_dbg(usbssp_data, "Successful NOP command.\n");
+ break;
+ default:
+ usbssp_warn(usbssp_data,
+ "Unknown completion code %u for NOP command.\n", ret);
+ ret = -EINVAL;
+ goto command_cleanup;
+ }
+
+ ret = 0;
+
+command_cleanup:
+ usbssp_free_command(usbssp_data, nop_cmd);
+ return ret;
+}
--
2.17.1
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