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Commit 0b9fe32d authored by Felipe Balbi's avatar Felipe Balbi
Browse files

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: default avatarFelipe Balbi <balbi@ti.com>
parent f96a6ec1

drivers/usb/dwc3/core.h

+1 −0
Original line number Diff line number Diff line
@@ -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

drivers/usb/dwc3/debugfs.c

+82 −0
Original line number Diff line number Diff line
@@ -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: