This makes testing a lot easier when trying to
switch between host and device modes.
Signed-off-by: Felipe Balbi <balbi@xxxxxx>
---
drivers/usb/dwc3/core.h | 1 +
drivers/usb/dwc3/debugfs.c | 82 ++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 83 insertions(+), 0 deletions(-)
diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index 513a739..6f1e8c9 100644
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -154,6 +154,7 @@
#define DWC3_GCTL_CLK_PIPEHALF (2)
#define DWC3_GCTL_CLK_MASK (3)
+#define DWC3_GCTL_PRTCAP(n) (((n) & (3 << 12)) >> 12)
#define DWC3_GCTL_PRTCAPDIR(n) (n << 12)
#define DWC3_GCTL_PRTCAP_HOST 1
#define DWC3_GCTL_PRTCAP_DEVICE 2
diff --git a/drivers/usb/dwc3/debugfs.c b/drivers/usb/dwc3/debugfs.c
index da1ad77..fc49334 100644
--- a/drivers/usb/dwc3/debugfs.c
+++ b/drivers/usb/dwc3/debugfs.c
@@ -405,6 +405,80 @@ static const struct file_operations dwc3_regdump_fops = {
.release = single_release,
};
+static int dwc3_mode_show(struct seq_file *s, void *unused)
+{
+ struct dwc3 *dwc = s->private;
+ unsigned long flags;
+ u32 reg;
+
+ spin_lock_irqsave(&dwc->lock, flags);
+ reg = dwc3_readl(dwc->regs, DWC3_GCTL);
+ spin_unlock_irqrestore(&dwc->lock, flags);
+
+ switch (DWC3_GCTL_PRTCAP(reg)) {
+ case DWC3_GCTL_PRTCAP_HOST:
+ seq_printf(s, "host\n");
+ break;
+ case DWC3_GCTL_PRTCAP_DEVICE:
+ seq_printf(s, "device\n");
+ break;
+ case DWC3_GCTL_PRTCAP_OTG:
+ seq_printf(s, "OTG\n");
+ break;
+ default:
+ seq_printf(s, "UNKNOWN %08x\n", DWC3_GCTL_PRTCAP(reg));
+ }
+
+ return 0;
+}
+
+static int dwc3_mode_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, dwc3_mode_show, inode->i_private);
+}
+
+static ssize_t dwc3_mode_write(struct file *file,
+ const char __user *ubuf, size_t count, loff_t *ppos)
+{
+ struct seq_file *s = file->private_data;
+ struct dwc3 *dwc = s->private;
+ unsigned long flags;
+ u32 reg;
+ char buf[32];
+
+ if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count)))
+ return -EFAULT;
+
+ spin_lock_irqsave(&dwc->lock, flags);
+ reg = dwc3_readl(dwc->regs, DWC3_GCTL);
+ spin_unlock_irqrestore(&dwc->lock, flags);
+
+ reg &= ~(DWC3_GCTL_PRTCAPDIR(DWC3_GCTL_PRTCAP_OTG));
+
+ if (!strncmp(buf, "host", 4))
+ reg |= DWC3_GCTL_PRTCAP(DWC3_GCTL_PRTCAP_HOST);
+
+ if (!strncmp(buf, "device", 6))
+ reg |= DWC3_GCTL_PRTCAP(DWC3_GCTL_PRTCAP_DEVICE);
+
+ if (!strncmp(buf, "otg", 3))
+ reg |= DWC3_GCTL_PRTCAP(DWC3_GCTL_PRTCAP_OTG);
+
+ spin_lock_irqsave(&dwc->lock, flags);
+ dwc3_writel(dwc->regs, DWC3_GCTL, reg);
+ spin_unlock_irqrestore(&dwc->lock, flags);
+
+ return count;
+}
+
+static const struct file_operations dwc3_mode_fops = {
+ .open = dwc3_mode_open,
+ .write = dwc3_mode_write,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
int __devinit dwc3_debugfs_init(struct dwc3 *dwc)
{
struct dentry *root;
@@ -425,6 +499,14 @@ int __devinit dwc3_debugfs_init(struct dwc3 *dwc)
ret = PTR_ERR(file);
goto err1;
}
+
+ file = debugfs_create_file("mode", S_IRUGO | S_IWUSR, root,
+ dwc, &dwc3_mode_fops);
+ if (IS_ERR(file)) {
+ ret = PTR_ERR(file);
+ goto err1;
+ }
+
return 0;
err1:
--
1.7.8.rc3
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