1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2012 Russell King
4 *  Rewritten from the dovefb driver, and Armada510 manuals.
5 */
6
7#include <linux/ctype.h>
8#include <linux/module.h>
9#include <linux/seq_file.h>
10#include <linux/uaccess.h>
11
12#include <drm/drm_debugfs.h>
13#include <drm/drm_file.h>
14
15#include "armada_crtc.h"
16#include "armada_drm.h"
17
18static int armada_debugfs_gem_linear_show(struct seq_file *m, void *data)
19{
20	struct drm_info_node *node = m->private;
21	struct drm_device *dev = node->minor->dev;
22	struct armada_private *priv = drm_to_armada_dev(dev);
23	struct drm_printer p = drm_seq_file_printer(m);
24
25	mutex_lock(&priv->linear_lock);
26	drm_mm_print(&priv->linear, &p);
27	mutex_unlock(&priv->linear_lock);
28
29	return 0;
30}
31
32static int armada_debugfs_crtc_reg_show(struct seq_file *m, void *data)
33{
34	struct armada_crtc *dcrtc = m->private;
35	int i;
36
37	for (i = 0x84; i <= 0x1c4; i += 4) {
38		u32 v = readl_relaxed(dcrtc->base + i);
39		seq_printf(m, "0x%04x: 0x%08x\n", i, v);
40	}
41
42	return 0;
43}
44
45static int armada_debugfs_crtc_reg_open(struct inode *inode, struct file *file)
46{
47	return single_open(file, armada_debugfs_crtc_reg_show,
48			   inode->i_private);
49}
50
51static int armada_debugfs_crtc_reg_write(struct file *file,
52	const char __user *ptr, size_t len, loff_t *off)
53{
54	struct armada_crtc *dcrtc;
55	unsigned long reg, mask, val;
56	char buf[32];
57	int ret;
58	u32 v;
59
60	if (*off != 0)
61		return 0;
62
63	if (len > sizeof(buf) - 1)
64		len = sizeof(buf) - 1;
65
66	ret = strncpy_from_user(buf, ptr, len);
67	if (ret < 0)
68		return ret;
69	buf[len] = '\0';
70
71	if (sscanf(buf, "%lx %lx %lx", &reg, &mask, &val) != 3)
72		return -EINVAL;
73	if (reg < 0x84 || reg > 0x1c4 || reg & 3)
74		return -ERANGE;
75
76	dcrtc = ((struct seq_file *)file->private_data)->private;
77	v = readl(dcrtc->base + reg);
78	v &= ~mask;
79	v |= val & mask;
80	writel(v, dcrtc->base + reg);
81
82	return len;
83}
84
85static const struct file_operations armada_debugfs_crtc_reg_fops = {
86	.owner = THIS_MODULE,
87	.open = armada_debugfs_crtc_reg_open,
88	.read = seq_read,
89	.write = armada_debugfs_crtc_reg_write,
90	.llseek = seq_lseek,
91	.release = single_release,
92};
93
94void armada_drm_crtc_debugfs_init(struct armada_crtc *dcrtc)
95{
96	debugfs_create_file("armada-regs", 0600, dcrtc->crtc.debugfs_entry,
97			    dcrtc, &armada_debugfs_crtc_reg_fops);
98}
99
100static struct drm_info_list armada_debugfs_list[] = {
101	{ "gem_linear", armada_debugfs_gem_linear_show, 0 },
102};
103#define ARMADA_DEBUGFS_ENTRIES ARRAY_SIZE(armada_debugfs_list)
104
105int armada_drm_debugfs_init(struct drm_minor *minor)
106{
107	drm_debugfs_create_files(armada_debugfs_list, ARMADA_DEBUGFS_ENTRIES,
108				 minor->debugfs_root, minor);
109
110	return 0;
111}
112