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Subject[PATCH 07/15] Introduce Cadence USBSSP DRD Driver - added gadget-if.c Driver implements interface between gadget drivers and USBSSP device driver.
Date
Signed-off-by: Laszczak Pawel <pawell@cadence.com>
---
drivers/usb/usbssp/gadget-if.c | 572 +++++++++++++++++++++++++++++++++
1 file changed, 572 insertions(+)
create mode 100644 drivers/usb/usbssp/gadget-if.c

diff --git a/drivers/usb/usbssp/gadget-if.c b/drivers/usb/usbssp/gadget-if.c
new file mode 100644
index 000000000000..00391560e921
--- /dev/null
+++ b/drivers/usb/usbssp/gadget-if.c
@@ -0,0 +1,572 @@
+// 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/usb/gadget.h>
+#include <linux/usb/composite.h>
+#include "gadget.h"
+
+#define usbssp_g_lock(flag, save_flags) { \
+ if (in_interrupt()) {\
+ spin_lock_irqsave(&usbssp_data->lock, save_flags); \
+ } else { \
+ if (!irqs_disabled()) { \
+ spin_lock_irqsave(&usbssp_data->irq_thread_lock,\
+ usbssp_data->irq_thread_flag);\
+ flag = 1; \
+ } else \
+ spin_lock(&usbssp_data->irq_thread_lock); \
+ } }
+
+
+#define usbssp_g_unlock(flag, save_flags) { \
+ if (in_interrupt()) \
+ spin_unlock_irqrestore(&usbssp_data->lock, save_flags); \
+ else { \
+ if (flag) \
+ spin_unlock_irqrestore(&usbssp_data->irq_thread_lock,\
+ usbssp_data->irq_thread_flag);\
+ else \
+ spin_unlock(&usbssp_data->irq_thread_lock); \
+ } }
+
+static int usbssp_gadget_ep_enable(struct usb_ep *ep,
+ const struct usb_endpoint_descriptor *desc)
+{
+ struct usbssp_ep *ep_priv;
+ struct usbssp_udc *usbssp_data;
+ int ret = 0;
+ int irq_disabled_locally = 0;
+ unsigned long flags = 0;
+
+ if (!ep || !desc || desc->bDescriptorType != USB_DT_ENDPOINT) {
+ pr_err("invalid parameters\n");
+ return -EINVAL;
+ }
+
+ ep_priv = to_usbssp_ep(ep);
+ usbssp_data = ep_priv->usbssp_data;
+
+ if (!desc->wMaxPacketSize) {
+ usbssp_dbg(usbssp_data, "missing wMaxPacketSize\n");
+ return -EINVAL;
+ }
+
+
+
+
+ if (ep_priv->ep_state & USBSSP_EP_ENABLED) {
+ usbssp_dbg(usbssp_data, "%s is already enabled\n",
+ ep_priv->name);
+ return -EINVAL;
+ }
+
+ usbssp_g_lock(irq_disabled_locally, flags);
+ ret = usbssp_add_endpoint(usbssp_data, ep_priv);
+ if (ret < 0)
+ goto finish;
+
+ ep_priv->ep_state |= USBSSP_EP_ENABLED;
+
+ /*Update bandwidth information*/
+ ret = usbssp_check_bandwidth(usbssp_data, &usbssp_data->gadget);
+
+ if (ret < 0)
+ ep_priv->ep_state &= ~USBSSP_EP_ENABLED;
+
+finish:
+ usbssp_dbg(usbssp_data, "%s enable endpoint %s\n", ep_priv->name,
+ (ret == 0) ? "success" : "failed");
+ usbssp_g_unlock(irq_disabled_locally, flags);
+ return ret;
+}
+
+int usbssp_gadget_ep_disable(struct usb_ep *ep)
+{
+ struct usbssp_ep *ep_priv;
+ struct usbssp_udc *usbssp_data;
+ int ep_index = 0;
+ int ret;
+ int irq_disabled_locally = 0;
+ unsigned long flags = 0;
+ struct usbssp_request *req_priv;
+
+ ep_priv = to_usbssp_ep(ep);
+ usbssp_data = ep_priv->usbssp_data;
+ ep_index = usbssp_get_endpoint_index(ep_priv->endpoint.desc);
+
+ if (!(ep_priv->ep_state & USBSSP_EP_ENABLED)) {
+ usbssp_dbg(usbssp_data, "%s is already disabled\n",
+ ep_priv->name);
+ return -EINVAL;
+ }
+
+ usbssp_g_lock(irq_disabled_locally, flags);
+
+ ep_priv->ep_state |= USBSSP_EP_DISABLE_PENDING;
+
+ /*dequeue all USB request from endpoint*/
+ list_for_each_entry(req_priv, &ep_priv->pending_list, list) {
+ usbssp_dequeue(ep_priv, req_priv);
+ }
+
+ ret = usbssp_drop_endpoint(usbssp_data, &usbssp_data->gadget, ep_priv);
+ if (ret)
+ goto finish;
+
+ ret = usbssp_check_bandwidth(usbssp_data, &usbssp_data->gadget);
+ if (ret)
+ goto finish;
+
+ ep_priv->ep_state &= ~USBSSP_EP_ENABLED;
+
+finish:
+ ep_priv->ep_state &= ~USBSSP_EP_DISABLE_PENDING;
+ usbssp_dbg(usbssp_data, "%s disable endpoint %s\n", ep_priv->name,
+ (ret == 0) ? "success" : "failed");
+
+ usbssp_g_unlock(irq_disabled_locally, flags);
+ return ret;
+}
+
+static struct usb_request *usbssp_gadget_ep_alloc_request(struct usb_ep *ep,
+ gfp_t gfp_flags)
+{
+ struct usbssp_request *req_priv;
+ struct usbssp_ep *ep_priv = to_usbssp_ep(ep);
+
+ req_priv = kzalloc(sizeof(*req_priv), gfp_flags);
+ if (!req_priv)
+ return NULL;
+
+ req_priv->epnum = ep_priv->number;
+ req_priv->dep = ep_priv;
+
+ trace_usbssp_alloc_request(&req_priv->request);
+ return &req_priv->request;
+}
+
+static void usbssp_gadget_ep_free_request(struct usb_ep *ep,
+ struct usb_request *request)
+{
+ struct usbssp_request *req_priv = to_usbssp_request(request);
+
+ trace_usbssp_free_request(&req_priv->request);
+ kfree(req_priv);
+}
+
+static int usbssp_gadget_ep_queue(struct usb_ep *ep,
+ struct usb_request *request,
+ gfp_t gfp_flags)
+{
+ struct usbssp_ep *ep_priv = to_usbssp_ep(ep);
+ struct usbssp_request *req_priv = to_usbssp_request(request);
+ struct usbssp_udc *usbssp_data = ep_priv->usbssp_data;
+ unsigned long flags = 0;
+ int irq_disabled_locally = 0;
+ int ret;
+
+ if (!ep_priv->endpoint.desc) {
+ usbssp_err(usbssp_data,
+ "%s: can't queue to disabled endpoint\n",
+ ep_priv->name);
+ return -ESHUTDOWN;
+ }
+
+ if ((ep_priv->ep_state & USBSSP_EP_DISABLE_PENDING ||
+ !(ep_priv->ep_state & USBSSP_EP_ENABLED))) {
+ dev_err(usbssp_data->dev,
+ "%s: can't queue to disabled endpoint\n",
+ ep_priv->name);
+ ret = -ESHUTDOWN;
+ goto out;
+ }
+
+ usbssp_g_lock(irq_disabled_locally, flags);
+ ret = usbssp_enqueue(ep_priv, req_priv);
+ usbssp_g_unlock(irq_disabled_locally, flags);
+out:
+ return ret;
+}
+
+static int usbssp_gadget_ep_dequeue(struct usb_ep *ep,
+ struct usb_request *request)
+{
+ struct usbssp_ep *ep_priv = to_usbssp_ep(ep);
+ struct usbssp_request *req_priv = to_usbssp_request(request);
+ struct usbssp_udc *usbssp_data = ep_priv->usbssp_data;
+ unsigned long flags = 0;
+ int ret;
+ int irq_disabled_locally = 0;
+
+ if (!ep_priv->endpoint.desc) {
+ usbssp_err(usbssp_data,
+ "%s: can't queue to disabled endpoint\n",
+ ep_priv->name);
+ return -ESHUTDOWN;
+ }
+
+ usbssp_g_lock(irq_disabled_locally, flags);
+ ret = usbssp_dequeue(ep_priv, req_priv);
+ usbssp_g_unlock(irq_disabled_locally, flags);
+
+ return ret;
+}
+
+static int usbssp_gadget_ep_set_halt(struct usb_ep *ep, int value)
+{
+ struct usbssp_ep *ep_priv = to_usbssp_ep(ep);
+ struct usbssp_udc *usbssp_data = ep_priv->usbssp_data;
+ int ret;
+ int irq_disabled_locally = 0;
+ unsigned long flags = 0;
+
+ usbssp_g_lock(irq_disabled_locally, flags);
+ ret = usbssp_halt_endpoint(usbssp_data, ep_priv, value);
+ usbssp_g_unlock(irq_disabled_locally, flags);
+ return ret;
+}
+
+static int usbssp_gadget_ep_set_wedge(struct usb_ep *ep)
+{
+ struct usbssp_ep *ep_priv = to_usbssp_ep(ep);
+ struct usbssp_udc *usbssp_data = ep_priv->usbssp_data;
+ unsigned long flags = 0;
+ int ret;
+ int irq_disabled_locally = 0;
+
+ usbssp_g_lock(irq_disabled_locally, flags);
+ ep_priv->ep_state |= USBSSP_EP_WEDGE;
+ ret = usbssp_halt_endpoint(usbssp_data, ep_priv, 1);
+ usbssp_g_unlock(irq_disabled_locally, flags);
+
+ return ret;
+}
+
+static const struct usb_ep_ops usbssp_gadget_ep0_ops = {
+ .enable = usbssp_gadget_ep_enable,
+ .disable = usbssp_gadget_ep_disable,
+ .alloc_request = usbssp_gadget_ep_alloc_request,
+ .free_request = usbssp_gadget_ep_free_request,
+ .queue = usbssp_gadget_ep_queue,
+ .dequeue = usbssp_gadget_ep_dequeue,
+ .set_halt = usbssp_gadget_ep_set_halt,
+ .set_wedge = usbssp_gadget_ep_set_wedge,
+};
+
+static const struct usb_ep_ops usbssp_gadget_ep_ops = {
+ .enable = usbssp_gadget_ep_enable,
+ .disable = usbssp_gadget_ep_disable,
+ .alloc_request = usbssp_gadget_ep_alloc_request,
+ .free_request = usbssp_gadget_ep_free_request,
+ .queue = usbssp_gadget_ep_queue,
+ .dequeue = usbssp_gadget_ep_dequeue,
+ .set_halt = usbssp_gadget_ep_set_halt,
+ .set_wedge = usbssp_gadget_ep_set_wedge,
+};
+
+void usbssp_gadget_giveback(struct usbssp_ep *ep_priv,
+ struct usbssp_request *req_priv, int status)
+{
+ struct usbssp_udc *usbssp_data = ep_priv->usbssp_data;
+
+ list_del(&req_priv->list);
+
+ if (req_priv->request.status == -EINPROGRESS)
+ req_priv->request.status = status;
+
+ usb_gadget_unmap_request_by_dev(usbssp_data->dev,
+ &req_priv->request, req_priv->direction);
+
+ trace_usbssp_request_giveback(&req_priv->request);
+
+ if (in_interrupt())
+ spin_unlock(&usbssp_data->lock);
+ else
+ spin_unlock(&usbssp_data->irq_thread_lock);
+
+ if (req_priv != &usbssp_data->usb_req_ep0_in) {
+ usb_gadget_giveback_request(&ep_priv->endpoint,
+ &req_priv->request);
+ }
+
+ if (in_interrupt())
+ spin_lock(&usbssp_data->lock);
+ else
+ spin_lock(&usbssp_data->irq_thread_lock);
+
+}
+
+static struct usb_endpoint_descriptor usbssp_gadget_ep0_desc = {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+ .bmAttributes = USB_ENDPOINT_XFER_CONTROL,
+};
+
+static int usbssp_gadget_start(struct usb_gadget *g,
+ struct usb_gadget_driver *driver)
+{
+ struct usbssp_udc *usbssp_data = gadget_to_usbssp(g);
+ int ret = 0;
+
+ if (usbssp_data->gadget_driver) {
+ usbssp_err(usbssp_data, "%s is already bound to %s\n",
+ usbssp_data->gadget.name,
+ usbssp_data->gadget_driver->driver.name);
+ ret = -EBUSY;
+ goto err1;
+ }
+
+ usbssp_data->gadget_driver = driver;
+
+ if (pm_runtime_active(usbssp_data->dev)) {
+ usbssp_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);
+ usbssp_data->ep0state = USBSSP_EP0_UNCONNECTED;
+ ret = usbssp_run(usbssp_data);
+ if (ret < 0)
+ goto err1;
+ }
+ return 0;
+err1:
+ return ret;
+}
+
+static int usbssp_gadget_stop(struct usb_gadget *g)
+{
+ unsigned long flags = 0;
+ int irq_disabled_locally = 0;
+ struct usbssp_udc *usbssp_data = gadget_to_usbssp(g);
+
+ usbssp_g_lock(irq_disabled_locally, flags);
+ if (pm_runtime_suspended(usbssp_data->dev))
+ goto out;
+
+ usbssp_free_dev(usbssp_data);
+ usbssp_stop(usbssp_data);
+out:
+ usbssp_data->gadget_driver = NULL;
+ usbssp_g_unlock(irq_disabled_locally, flags);
+
+ return 0;
+}
+
+static int usbssp_gadget_get_frame(struct usb_gadget *g)
+{
+ struct usbssp_udc *usbssp_data = gadget_to_usbssp(g);
+
+ return usbssp_get_frame(usbssp_data);
+}
+
+static int usbssp_gadget_wakeup(struct usb_gadget *g)
+{
+ struct usbssp_udc *usbssp_data = gadget_to_usbssp(g);
+ unsigned long flags = 0;
+ int irq_disabled_locally = 0;
+ __le32 __iomem *port_regs;
+ u32 temp;
+
+ if (!usbssp_data->port_remote_wakeup)
+ return -EINVAL;
+
+ if (!usbssp_data->port_suspended)
+ return -EINVAL;
+
+ usbssp_g_lock(irq_disabled_locally, flags);
+
+ port_regs = usbssp_get_port_io_addr(usbssp_data);
+ temp = readl(port_regs+PORTPMSC);
+
+ if (!(temp & PORT_RWE))
+ return 0;
+
+ temp = readl(port_regs + PORTSC);
+
+ temp &= ~PORT_PLS_MASK;
+ writel(temp, port_regs + PORTPMSC);
+ usbssp_g_unlock(irq_disabled_locally, flags);
+ return 0;
+}
+
+static int usbssp_gadget_set_selfpowered(struct usb_gadget *g,
+ int is_selfpowered)
+{
+ unsigned long flags = 0;
+ int irq_disabled_locally = 0;
+ struct usbssp_udc *usbssp_data = gadget_to_usbssp(g);
+
+ usbssp_g_lock(irq_disabled_locally, flags);
+
+ g->is_selfpowered = !!is_selfpowered;
+ usbssp_g_unlock(irq_disabled_locally, flags);
+
+ return 0;
+}
+
+static const struct usb_gadget_ops usbssp_gadget_ops = {
+ .get_frame = usbssp_gadget_get_frame,
+ .wakeup = usbssp_gadget_wakeup,
+ .set_selfpowered = usbssp_gadget_set_selfpowered,
+ .udc_start = usbssp_gadget_start,
+ .udc_stop = usbssp_gadget_stop,
+};
+
+int usbssp_gadget_init_endpoint(struct usbssp_udc *usbssp_data)
+{
+ int i = 0;
+ struct usbssp_ep *ep_priv;
+
+ usbssp_data->num_endpoints = USBSSP_ENDPOINTS_NUM;
+ INIT_LIST_HEAD(&usbssp_data->gadget.ep_list);
+
+ for (i = 1; i < usbssp_data->num_endpoints; i++) {
+ bool direction = i & 1; /*start from OUT endpoint*/
+ u8 epnum = (i >> 1);
+
+ ep_priv = &usbssp_data->devs.eps[i-1];
+ ep_priv->usbssp_data = usbssp_data;
+ ep_priv->number = epnum;
+ ep_priv->direction = direction; /*0 for OUT, 1 for IN*/
+
+ snprintf(ep_priv->name, sizeof(ep_priv->name), "ep%d%s", epnum,
+ (ep_priv->direction) ? "in" : "out");
+
+ ep_priv->endpoint.name = ep_priv->name;
+
+ if (ep_priv->number < 2) {
+ ep_priv->endpoint.desc = &usbssp_gadget_ep0_desc;
+ ep_priv->endpoint.comp_desc = NULL;
+ }
+
+ if (epnum == 0) { //EP0 is bidirectional endpoint
+ usb_ep_set_maxpacket_limit(&ep_priv->endpoint, 512);
+ usbssp_dbg(usbssp_data,
+ "Initializing %s, MaxPack: %04x Type: Ctrl\n",
+ ep_priv->name, 512);
+ ep_priv->endpoint.maxburst = 1;
+ ep_priv->endpoint.ops = &usbssp_gadget_ep0_ops;
+ ep_priv->endpoint.caps.type_control = true;
+
+ usbssp_data->usb_req_ep0_in.epnum = ep_priv->number;
+ usbssp_data->usb_req_ep0_in.dep = ep_priv;
+
+ if (!epnum)
+ usbssp_data->gadget.ep0 = &ep_priv->endpoint;
+ } else {
+ usb_ep_set_maxpacket_limit(&ep_priv->endpoint, 1024);
+ ep_priv->endpoint.maxburst = 15;
+ ep_priv->endpoint.ops = &usbssp_gadget_ep_ops;
+ list_add_tail(&ep_priv->endpoint.ep_list,
+ &usbssp_data->gadget.ep_list);
+ ep_priv->endpoint.caps.type_iso = true;
+ ep_priv->endpoint.caps.type_bulk = true;
+ ep_priv->endpoint.caps.type_int = true;
+
+ }
+
+ ep_priv->endpoint.caps.dir_in = direction;
+ ep_priv->endpoint.caps.dir_out = !direction;
+
+ usbssp_dbg(usbssp_data, "Init %s, MaxPack: %04x SupType:"
+ " INT/BULK/ISOC , SupDir %s\n",
+ ep_priv->name, 1024,
+ (ep_priv->endpoint.caps.dir_in) ? "IN" : "OUT");
+
+ INIT_LIST_HEAD(&ep_priv->pending_list);
+ }
+ return 0;
+}
+
+void usbssp_gadget_free_endpoint(struct usbssp_udc *usbssp_data)
+{
+ int i;
+ struct usbssp_ep *ep_priv;
+
+ for (i = 0; i < usbssp_data->num_endpoints; i++) {
+ ep_priv = &usbssp_data->devs.eps[i];
+
+ if (ep_priv->number != 0)
+ list_del(&ep_priv->endpoint.ep_list);
+ }
+}
+
+static void usbssp_disconnect_gadget(struct usbssp_udc *usbssp_data)
+{
+ if (usbssp_data->gadget_driver &&
+ usbssp_data->gadget_driver->disconnect) {
+ spin_unlock(&usbssp_data->irq_thread_lock);
+ usbssp_data->gadget_driver->disconnect(&usbssp_data->gadget);
+ spin_lock(&usbssp_data->irq_thread_lock);
+ }
+}
+
+void usbssp_suspend_gadget(struct usbssp_udc *usbssp_data)
+{
+ if (usbssp_data->gadget_driver && usbssp_data->gadget_driver->suspend) {
+ spin_unlock(&usbssp_data->lock);
+ usbssp_data->gadget_driver->suspend(&usbssp_data->gadget);
+ spin_lock(&usbssp_data->lock);
+ }
+}
+
+void usbssp_resume_gadget(struct usbssp_udc *usbssp_data)
+{
+ if (usbssp_data->gadget_driver && usbssp_data->gadget_driver->resume) {
+ spin_unlock(&usbssp_data->lock);
+ usbssp_data->gadget_driver->resume(&usbssp_data->gadget);
+ spin_lock(&usbssp_data->lock);
+ }
+}
+
+static void usbssp_reset_gadget(struct usbssp_udc *usbssp_data)
+{
+ if (!usbssp_data->gadget_driver)
+ return;
+
+ if (usbssp_data->gadget.speed != USB_SPEED_UNKNOWN) {
+ spin_unlock(&usbssp_data->lock);
+ usb_gadget_udc_reset(&usbssp_data->gadget,
+ usbssp_data->gadget_driver);
+ spin_lock(&usbssp_data->lock);
+ }
+}
+
+void usbssp_gadget_disconnect_interrupt(struct usbssp_udc *usbssp_data)
+{
+ usbssp_disconnect_gadget(usbssp_data);
+}
+
+
+void usbssp_gadget_reset_interrupt(struct usbssp_udc *usbssp_data)
+{
+ usbssp_reset_gadget(usbssp_data);
+ switch (usbssp_data->gadget.speed) {
+ case USB_SPEED_SUPER_PLUS:
+ usbssp_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);
+ usbssp_data->gadget.ep0->maxpacket = 512;
+ break;
+ case USB_SPEED_SUPER:
+ usbssp_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);
+ usbssp_data->gadget.ep0->maxpacket = 512;
+ break;
+ case USB_SPEED_HIGH:
+ usbssp_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(64);
+ usbssp_data->gadget.ep0->maxpacket = 64;
+ break;
+ case USB_SPEED_FULL:
+ usbssp_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(64);
+ usbssp_data->gadget.ep0->maxpacket = 64;
+ break;
+ case USB_SPEED_LOW:
+ usbssp_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(8);
+ usbssp_data->gadget.ep0->maxpacket = 8;
+ break;
+ default:
+ break;
+ }
+}
--
2.17.1
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