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usb: dwc3: debugfs: add support for changing port mode 

This makes testing a lot easier when trying to
switch between host and device modes.

Signed-off-by: Felipe Balbi <balbi@ti.com>
hifive-unleashed-5.1
Felipe Balbi 2011-10-17 08:50:39 +03:00
parent f96a6ec1db
commit 0b9fe32dee
2 changed files with 83 additions and 0 deletions
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1
drivers/usb/dwc3/core.h
View File

@ -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

82
drivers/usb/dwc3/debugfs.c
View File

@ -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: