From 47d3946ea220f2db43b3abc46c9e64287d625ac3 Mon Sep 17 00:00:00 2001
From: Bryan O'Donoghue <pure.logic@nexus-software.ie>
Date: Tue, 31 Jan 2017 20:58:10 +0000
Subject: [PATCH] usb: dwc3: refactor gadget endpoint count calculation
- DWC_USB3_NUM indicates the number of Device mode single directional
endpoints, including OUT and IN endpoint 0.
- DWC_USB3_NUM_IN_EPS indicates the maximum number of Device mode IN
endpoints active at any time, including control endpoint 0.
It's possible to configure RTL such that DWC_USB3_NUM_EPS is equal to
DWC_USB3_NUM_IN_EPS.
dwc3-core calculates the number of OUT endpoints as DWC_USB3_NUM minus
DWC_USB3_NUM_IN_EPS. If RTL has been configured with DWC_USB3_NUM_IN_EPS
equal to DWC_USB3_NUM then dwc3-core will calculate the number of OUT
endpoints as zero.
For example a from dwc3_core_num_eps() shows:
[ 1.565000] /usb0@f01d0000: found 8 IN and 0 OUT endpoints
This patch refactors the endpoint calculation down to one variable
dwc->num_eps taking care to maintain the current mapping of endpoints for
fixed FPGA configurations as described in Table 4-7 of version 2.60a of the
DWC USB3 databook.
The endpoint mapping will then be EP-OUT, EP-IN etc, up to DWC_USB3_NUM.
If DWC_USB3_NUM is odd then OUT will take the extra endpoint.
Suggested-by: Felipe Balbi <balbi@kernel.org>
Signed-off-by: Bryan O'Donoghue <pure.logic@nexus-software.ie>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
---
drivers/usb/dwc3/core.c | 3 +--
drivers/usb/dwc3/core.h | 6 ++----
drivers/usb/dwc3/debugfs.c | 15 ++-------------
drivers/usb/dwc3/gadget.c | 33 +++++++++------------------------
4 files changed, 14 insertions(+), 43 deletions(-)
diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index 8173d0634d682..56f136784cd38 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -397,8 +397,7 @@ static void dwc3_core_num_eps(struct dwc3 *dwc)
{
struct dwc3_hwparams *parms = &dwc->hwparams;
- dwc->num_in_eps = DWC3_NUM_IN_EPS(parms);
- dwc->num_out_eps = DWC3_NUM_EPS(parms) - dwc->num_in_eps;
+ dwc->num_eps = DWC3_NUM_EPS(parms);
}
static void dwc3_cache_hwparams(struct dwc3 *dwc)
diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index 2fa768637f491..92045efefaab4 100644
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -800,8 +800,7 @@ struct dwc3_scratchpad_array {
* @u2pel: parameter from Set SEL request.
* @u1sel: parameter from Set SEL request.
* @u1pel: parameter from Set SEL request.
- * @num_out_eps: number of out endpoints
- * @num_in_eps: number of in endpoints
+ * @num_eps: number of endpoints
* @ep0_next_event: hold the next expected event
* @ep0state: state of endpoint zero
* @link_state: link state
@@ -961,8 +960,7 @@ struct dwc3 {
u8 speed;
- u8 num_out_eps;
- u8 num_in_eps;
+ u8 num_eps;
struct dwc3_hwparams hwparams;
struct dentry *root;
diff --git a/drivers/usb/dwc3/debugfs.c b/drivers/usb/dwc3/debugfs.c
index 31926dda43c96..7df45415ad70d 100644
--- a/drivers/usb/dwc3/debugfs.c
+++ b/drivers/usb/dwc3/debugfs.c
@@ -822,19 +822,8 @@ static void dwc3_debugfs_create_endpoint_dirs(struct dwc3 *dwc,
{
int i;
- for (i = 0; i < dwc->num_in_eps; i++) {
- u8 epnum = (i << 1) | 1;
- struct dwc3_ep *dep = dwc->eps[epnum];
-
- if (!dep)
- continue;
-
- dwc3_debugfs_create_endpoint_dir(dep, parent);
- }
-
- for (i = 0; i < dwc->num_out_eps; i++) {
- u8 epnum = (i << 1);
- struct dwc3_ep *dep = dwc->eps[epnum];
+ for (i = 0; i < dwc->num_eps; i++) {
+ struct dwc3_ep *dep = dwc->eps[i];
if (!dep)
continue;
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 79e7a3480d51b..fe4e0ac00f06a 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -2006,14 +2006,13 @@ static const struct usb_gadget_ops dwc3_gadget_ops = {
/* -------------------------------------------------------------------------- */
-static int dwc3_gadget_init_hw_endpoints(struct dwc3 *dwc,
- u8 num, u32 direction)
+static int dwc3_gadget_init_hw_endpoints(struct dwc3 *dwc, u8 num)
{
struct dwc3_ep *dep;
- u8 i;
+ u8 epnum;
- for (i = 0; i < num; i++) {
- u8 epnum = (i << 1) | (direction ? 1 : 0);
+ for (epnum = 0; epnum < num; epnum++) {
+ bool direction = epnum & 1;
dep = kzalloc(sizeof(*dep), GFP_KERNEL);
if (!dep)
@@ -2021,12 +2020,12 @@ static int dwc3_gadget_init_hw_endpoints(struct dwc3 *dwc,
dep->dwc = dwc;
dep->number = epnum;
- dep->direction = !!direction;
+ dep->direction = direction;
dep->regs = dwc->regs + DWC3_DEP_BASE(epnum);
dwc->eps[epnum] = dep;
snprintf(dep->name, sizeof(dep->name), "ep%d%s", epnum >> 1,
- (epnum & 1) ? "in" : "out");
+ direction ? "in" : "out");
dep->endpoint.name = dep->name;
@@ -2053,7 +2052,7 @@ static int dwc3_gadget_init_hw_endpoints(struct dwc3 *dwc,
/* MDWIDTH is represented in bits, we need it in bytes */
mdwidth /= 8;
- size = dwc3_readl(dwc->regs, DWC3_GTXFIFOSIZ(i));
+ size = dwc3_readl(dwc->regs, DWC3_GTXFIFOSIZ(epnum >> 1));
size = DWC3_GTXFIFOSIZ_TXFDEF(size);
/* FIFO Depth is in MDWDITH bytes. Multiply */
@@ -2103,7 +2102,7 @@ static int dwc3_gadget_init_hw_endpoints(struct dwc3 *dwc,
dep->endpoint.caps.type_int = true;
}
- dep->endpoint.caps.dir_in = !!direction;
+ dep->endpoint.caps.dir_in = direction;
dep->endpoint.caps.dir_out = !direction;
INIT_LIST_HEAD(&dep->pending_list);
@@ -2115,23 +2114,9 @@ static int dwc3_gadget_init_hw_endpoints(struct dwc3 *dwc,
static int dwc3_gadget_init_endpoints(struct dwc3 *dwc)
{
- int ret;
-
INIT_LIST_HEAD(&dwc->gadget.ep_list);
- ret = dwc3_gadget_init_hw_endpoints(dwc, dwc->num_out_eps, 0);
- if (ret < 0) {
- dev_err(dwc->dev, "failed to initialize OUT endpoints\n");
- return ret;
- }
-
- ret = dwc3_gadget_init_hw_endpoints(dwc, dwc->num_in_eps, 1);
- if (ret < 0) {
- dev_err(dwc->dev, "failed to initialize IN endpoints\n");
- return ret;
- }
-
- return 0;
+ return dwc3_gadget_init_hw_endpoints(dwc, dwc->num_eps);
}
static void dwc3_gadget_free_endpoints(struct dwc3 *dwc)
--
2.30.2