8bc1901ca7
This patch introduce new Cadence USBSS DRD driver to Linux kernel. The Cadence USBSS DRD Controller is a highly configurable IP Core which can be instantiated as Dual-Role Device (DRD), Peripheral Only and Host Only (XHCI)configurations. The current driver has been validated with FPGA platform. We have support for PCIe bus, which is used on FPGA prototyping. The host side of USBSS-DRD controller is compliant with XHCI specification, so it works with standard XHCI Linux driver. Signed-off-by: Pawel Laszczak <pawell@cadence.com> Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
154 lines
3.4 KiB
C
154 lines
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Cadence USBSS DRD Controller DebugFS filer.
|
|
*
|
|
* Copyright (C) 2018-2019 Cadence.
|
|
*
|
|
* Author: Pawel Laszczak <pawell@cadence.com>
|
|
*/
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/debugfs.h>
|
|
#include <linux/seq_file.h>
|
|
#include <linux/uaccess.h>
|
|
|
|
#include "core.h"
|
|
#include "gadget.h"
|
|
#include "drd.h"
|
|
|
|
static const char *const cdns3_mode[] = {
|
|
[USB_DR_MODE_UNKNOWN] = "unknown",
|
|
[USB_DR_MODE_OTG] = "otg",
|
|
[USB_DR_MODE_HOST] = "host",
|
|
[USB_DR_MODE_PERIPHERAL] = "device",
|
|
};
|
|
|
|
static int cdns3_mode_show(struct seq_file *s, void *unused)
|
|
{
|
|
struct cdns3 *cdns = s->private;
|
|
|
|
seq_puts(s, cdns3_mode[cdns->current_dr_mode]);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int cdns3_mode_open(struct inode *inode, struct file *file)
|
|
{
|
|
return single_open(file, cdns3_mode_show, inode->i_private);
|
|
}
|
|
|
|
static ssize_t cdns3_mode_write(struct file *file,
|
|
const char __user *ubuf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct seq_file *s = file->private_data;
|
|
struct cdns3 *cdns = s->private;
|
|
char buf[32];
|
|
int ret;
|
|
|
|
if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count)))
|
|
return -EFAULT;
|
|
|
|
if (cdns->debug_disable) {
|
|
dev_err(cdns->dev,
|
|
"Mode can't be changed when disable is set\n");
|
|
return -EPERM;
|
|
}
|
|
|
|
ret = match_string(cdns3_mode, ARRAY_SIZE(cdns3_mode), buf);
|
|
if (ret < 0 || ret == USB_DR_MODE_UNKNOWN) {
|
|
dev_err(cdns->dev, "Failed: incorrect mode setting\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (cdns->current_dr_mode != ret) {
|
|
cdns->desired_dr_mode = ret;
|
|
cdns3_role_stop(cdns);
|
|
ret = cdns3_drd_update_mode(cdns);
|
|
if (ret)
|
|
return ret;
|
|
|
|
queue_work(system_freezable_wq, &cdns->role_switch_wq);
|
|
}
|
|
|
|
return count;
|
|
}
|
|
|
|
static const struct file_operations cdns3_mode_fops = {
|
|
.open = cdns3_mode_open,
|
|
.write = cdns3_mode_write,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
};
|
|
|
|
static int cdns3_disable_show(struct seq_file *s, void *unused)
|
|
{
|
|
struct cdns3 *cdns = s->private;
|
|
|
|
if (!cdns->debug_disable)
|
|
seq_puts(s, "0\n");
|
|
else
|
|
seq_puts(s, "1\n");
|
|
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t cdns3_disable_write(struct file *file,
|
|
const char __user *ubuf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct seq_file *s = file->private_data;
|
|
struct cdns3 *cdns = s->private;
|
|
bool disable;
|
|
char buf[16];
|
|
|
|
if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count)))
|
|
return -EFAULT;
|
|
|
|
if (kstrtobool(buf, &disable)) {
|
|
dev_err(cdns->dev, "wrong setting\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (disable != cdns->debug_disable) {
|
|
cdns->debug_disable = disable;
|
|
queue_work(system_freezable_wq, &cdns->role_switch_wq);
|
|
}
|
|
|
|
return count;
|
|
}
|
|
|
|
static int cdns3_disable_open(struct inode *inode, struct file *file)
|
|
{
|
|
return single_open(file, cdns3_disable_show, inode->i_private);
|
|
}
|
|
|
|
static const struct file_operations cdns3_disable_fops = {
|
|
.open = cdns3_disable_open,
|
|
.write = cdns3_disable_write,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
};
|
|
|
|
void cdns3_debugfs_init(struct cdns3 *cdns)
|
|
{
|
|
struct dentry *root;
|
|
|
|
root = debugfs_create_dir(dev_name(cdns->dev), NULL);
|
|
cdns->root = root;
|
|
if (IS_ENABLED(CONFIG_USB_CDNS3_GADGET) &&
|
|
IS_ENABLED(CONFIG_USB_CDNS3_HOST))
|
|
debugfs_create_file("mode", 0644, root, cdns,
|
|
&cdns3_mode_fops);
|
|
|
|
debugfs_create_file("disable", 0644, root, cdns,
|
|
&cdns3_disable_fops);
|
|
}
|
|
|
|
void cdns3_debugfs_exit(struct cdns3 *cdns)
|
|
{
|
|
debugfs_remove_recursive(cdns->root);
|
|
}
|