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Subject[PATCH 06/31] usb: usbssp: added template functions used by upper layer.
Date
Patch adds some functionality for initialization process.
It adds to driver usbssp_reset and usbssp_start function.

Next elements added are objects usbssp_gadget_ep0_ops,
usbssp_gadget_ep_ops and usbssp_gadget_ops. These objects
constitute the interface used by gadget subsystem.
At this moment functions related to these objects are empty
and do nothing.

This patch also implements usbssp_gadget_init_endpoint and
usbssp_gadget_free_endpoint used during initialization.

Signed-off-by: Pawel Laszczak <pawell@cadence.com>
---
drivers/usb/usbssp/gadget-ext-caps.h | 3 +
drivers/usb/usbssp/gadget-if.c | 269 ++++++++++++++++++++++++++-
drivers/usb/usbssp/gadget.c | 84 ++++++++-
3 files changed, 350 insertions(+), 6 deletions(-)

diff --git a/drivers/usb/usbssp/gadget-ext-caps.h b/drivers/usb/usbssp/gadget-ext-caps.h
index 2bf327046376..86c0ce331037 100644
--- a/drivers/usb/usbssp/gadget-ext-caps.h
+++ b/drivers/usb/usbssp/gadget-ext-caps.h
@@ -51,3 +51,6 @@
#define USBSSP_CMD_EWE BIT(10)

#define USBSSP_IRQS (USBSSP_CMD_EIE | USBSSP_CMD_HSEIE | USBSSP_CMD_EWE)
+
+/* true: Controller Not Ready to accept doorbell or op reg writes after reset */
+#define USBSSP_STS_CNR BIT(11)
diff --git a/drivers/usb/usbssp/gadget-if.c b/drivers/usb/usbssp/gadget-if.c
index d53e0fb65299..70def978b085 100644
--- a/drivers/usb/usbssp/gadget-if.c
+++ b/drivers/usb/usbssp/gadget-if.c
@@ -12,13 +12,278 @@
#include <linux/usb/composite.h>
#include "gadget.h"

+static int usbssp_gadget_ep_enable(struct usb_ep *ep,
+ const struct usb_endpoint_descriptor *desc)
+{
+ struct usbssp_ep *ep_priv = to_usbssp_ep(ep);
+ int ret = 0;
+
+ if (!ep_priv)
+ return -EINVAL;
+
+ /*TODO: implements this function*/
+ return ret;
+}
+
+int usbssp_gadget_ep_disable(struct usb_ep *ep)
+{
+ struct usbssp_ep *ep_priv = to_usbssp_ep(ep);
+ int ret = 0;
+
+ if (!ep_priv)
+ return -EINVAL;
+
+ /*TODO: implements this function*/
+ return ret;
+}
+
+static struct usb_request *usbssp_gadget_ep_alloc_request(struct usb_ep *ep,
+ gfp_t gfp_flags)
+{
+ struct usbssp_ep *ep_priv = to_usbssp_ep(ep);
+
+ if (!ep_priv)
+ return NULL;
+
+ /*TODO: implements this function*/
+ return NULL;
+}
+
+static void usbssp_gadget_ep_free_request(struct usb_ep *ep,
+ struct usb_request *request)
+{
+ struct usbssp_ep *ep_priv = to_usbssp_ep(ep);
+
+ if (!ep_priv)
+ return;
+
+ /*TODO: implements this function*/
+}
+
+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);
+ int ret = 0;
+
+ if (!ep_priv)
+ return -EINVAL;
+
+ /*TODO: implements this function*/
+ 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);
+ int ret = 0;
+
+ if (!ep_priv)
+ return -EINVAL;
+
+ /*TODO: implements this function*/
+ return ret;
+}
+
+static int usbssp_gadget_ep_set_halt(struct usb_ep *ep, int value)
+{
+ struct usbssp_ep *ep_priv = to_usbssp_ep(ep);
+ int ret = 0;
+
+ if (!ep_priv)
+ return -EINVAL;
+
+ /*TODO: implements this function*/
+ return ret;
+}
+
+static int usbssp_gadget_ep_set_wedge(struct usb_ep *ep)
+{
+ struct usbssp_ep *ep_priv = to_usbssp_ep(ep);
+ int ret = 0;
+
+ if (!ep_priv)
+ return -EINVAL;
+
+ /*TODO: implements this function*/
+ 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,
+};
+
+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) {
+ dev_err(usbssp_data->dev, "%s is already bound to %s\n",
+ usbssp_data->gadget.name,
+ usbssp_data->gadget_driver->driver.name);
+ ret = -EBUSY;
+ }
+
+ /*TODO: add implementation*/
+ return ret;
+}
+
+static int usbssp_gadget_stop(struct usb_gadget *g)
+{
+ struct usbssp_udc *usbssp_data = gadget_to_usbssp(g);
+
+ if (!usbssp_data)
+ return -EINVAL;
+ /*TODO: add implementation*/
+ return 0;
+}
+
+static int usbssp_gadget_get_frame(struct usb_gadget *g)
+{
+ struct usbssp_udc *usbssp_data = gadget_to_usbssp(g);
+
+ if (!usbssp_data)
+ return -EINVAL;
+
+ /*TODO: add implementation*/
+ return 0;
+}
+
+static int usbssp_gadget_wakeup(struct usb_gadget *g)
+{
+ struct usbssp_udc *usbssp_data = gadget_to_usbssp(g);
+
+ if (!usbssp_data)
+ return -EINVAL;
+
+ /*TODO: add implementation*/
+ return 0;
+}
+
+static int usbssp_gadget_set_selfpowered(struct usb_gadget *g,
+ int is_selfpowered)
+{
+ struct usbssp_udc *usbssp_data = gadget_to_usbssp(g);
+
+ if (!usbssp_data)
+ return -EINVAL;
+
+ /*TODO: add implementation*/
+ 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)
{
- /*TODO: it has to be implemented*/
+ 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);
+ dev_dbg(usbssp_data->dev,
+ "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;
+
+ dev_dbg(usbssp_data->dev, "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)
{
- /*TODO: it has to be implemented*/
+ 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);
+ }
}
diff --git a/drivers/usb/usbssp/gadget.c b/drivers/usb/usbssp/gadget.c
index 338ec2ec18b1..195f5777cf8a 100644
--- a/drivers/usb/usbssp/gadget.c
+++ b/drivers/usb/usbssp/gadget.c
@@ -103,6 +103,83 @@ int usbssp_halt(struct usbssp_udc *usbssp_data)
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)
+ dev_err(usbssp_data->dev, "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) {
+ dev_warn(usbssp_data->dev, "Device not accessible, reset failed.\n");
+ return -ENODEV;
+ }
+
+ if ((state & STS_HALT) == 0) {
+ dev_warn(usbssp_data->dev, "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;
+}

/*
* Initialize memory for gadget driver and USBSSP (one-time init).
@@ -179,8 +256,7 @@ int usbssp_gen_setup(struct usbssp_udc *usbssp_data)

dev_dbg(usbssp_data->dev, "Resetting Device Controller\n");
/* Reset the internal DC memory state and registers. */
- /*TODO: add implementation of usbssp_reset function*/
- //retval = usbssp_reset(usbssp_data);
+ retval = usbssp_reset(usbssp_data);
if (retval)
return retval;
dev_dbg(usbssp_data->dev, "Reset complete\n");
@@ -244,8 +320,7 @@ int usbssp_gadget_init(struct usbssp_udc *usbssp_data)
BUILD_BUG_ON(sizeof(struct usbssp_run_regs) != (8+8*128)*32/8);

/* fill gadget fields */
- /*TODO: implements usbssp_gadget_ops object*/
- //usbssp_data->gadget.ops = &usbssp_gadget_ops;
+ 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;
@@ -288,6 +363,7 @@ int usbssp_gadget_init(struct usbssp_udc *usbssp_data)
usbssp_halt(usbssp_data);
/*TODO add implementation of usbssp_reset function*/
//usbssp_reset(usbssp_data);
+ usbssp_reset(usbssp_data);
/*TODO add implementation of freeing memory*/
//usbssp_mem_cleanup(usbssp_data);
err3:
--
2.17.1
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