1 /*
2  * Copyright (C) 2012 Russell King
3  *  Rewritten from the dovefb driver, and Armada510 manuals.
4  *
5  * This program is free software; you can redistribute it and/or modify
6  * it under the terms of the GNU General Public License version 2 as
7  * published by the Free Software Foundation.
8  */
9 #include <linux/ctype.h>
10 #include <linux/debugfs.h>
11 #include <linux/module.h>
12 #include <linux/seq_file.h>
13 #include <drm/drmP.h>
14 #include "armada_crtc.h"
15 #include "armada_drm.h"
16 
17 static int armada_debugfs_gem_linear_show(struct seq_file *m, void *data)
18 {
19 	struct drm_info_node *node = m->private;
20 	struct drm_device *dev = node->minor->dev;
21 	struct armada_private *priv = dev->dev_private;
22 	struct drm_printer p = drm_seq_file_printer(m);
23 
24 	mutex_lock(&priv->linear_lock);
25 	drm_mm_print(&priv->linear, &p);
26 	mutex_unlock(&priv->linear_lock);
27 
28 	return 0;
29 }
30 
31 static int armada_debugfs_reg_show(struct seq_file *m, void *data)
32 {
33 	struct drm_device *dev = m->private;
34 	struct armada_private *priv = dev->dev_private;
35 	int n, i;
36 
37 	if (priv) {
38 		for (n = 0; n < ARRAY_SIZE(priv->dcrtc); n++) {
39 			struct armada_crtc *dcrtc = priv->dcrtc[n];
40 			if (!dcrtc)
41 				continue;
42 
43 			for (i = 0x84; i <= 0x1c4; i += 4) {
44 				uint32_t v = readl_relaxed(dcrtc->base + i);
45 				seq_printf(m, "%u: 0x%04x: 0x%08x\n", n, i, v);
46 			}
47 		}
48 	}
49 
50 	return 0;
51 }
52 
53 static int armada_debugfs_reg_r_open(struct inode *inode, struct file *file)
54 {
55 	return single_open(file, armada_debugfs_reg_show, inode->i_private);
56 }
57 
58 static const struct file_operations fops_reg_r = {
59 	.owner = THIS_MODULE,
60 	.open = armada_debugfs_reg_r_open,
61 	.read = seq_read,
62 	.llseek = seq_lseek,
63 	.release = single_release,
64 };
65 
66 static int armada_debugfs_write(struct file *file, const char __user *ptr,
67 	size_t len, loff_t *off)
68 {
69 	struct drm_device *dev = file->private_data;
70 	struct armada_private *priv = dev->dev_private;
71 	struct armada_crtc *dcrtc = priv->dcrtc[0];
72 	char buf[32], *p;
73 	uint32_t reg, val;
74 	int ret;
75 
76 	if (*off != 0)
77 		return 0;
78 
79 	if (len > sizeof(buf) - 1)
80 		len = sizeof(buf) - 1;
81 
82 	ret = strncpy_from_user(buf, ptr, len);
83 	if (ret < 0)
84 		return ret;
85 	buf[len] = '\0';
86 
87 	reg = simple_strtoul(buf, &p, 16);
88 	if (!isspace(*p))
89 		return -EINVAL;
90 	val = simple_strtoul(p + 1, NULL, 16);
91 
92 	if (reg >= 0x84 && reg <= 0x1c4)
93 		writel(val, dcrtc->base + reg);
94 
95 	return len;
96 }
97 
98 static const struct file_operations fops_reg_w = {
99 	.owner = THIS_MODULE,
100 	.open = simple_open,
101 	.write = armada_debugfs_write,
102 	.llseek = noop_llseek,
103 };
104 
105 static struct drm_info_list armada_debugfs_list[] = {
106 	{ "gem_linear", armada_debugfs_gem_linear_show, 0 },
107 };
108 #define ARMADA_DEBUGFS_ENTRIES ARRAY_SIZE(armada_debugfs_list)
109 
110 int armada_drm_debugfs_init(struct drm_minor *minor)
111 {
112 	struct dentry *de;
113 	int ret;
114 
115 	ret = drm_debugfs_create_files(armada_debugfs_list,
116 				       ARMADA_DEBUGFS_ENTRIES,
117 				       minor->debugfs_root, minor);
118 	if (ret)
119 		return ret;
120 
121 	de = debugfs_create_file("reg", S_IFREG | S_IRUSR,
122 				 minor->debugfs_root, minor->dev, &fops_reg_r);
123 	if (!de)
124 		return -ENOMEM;
125 
126 	de = debugfs_create_file("reg_wr", S_IFREG | S_IWUSR,
127 				 minor->debugfs_root, minor->dev, &fops_reg_w);
128 	if (!de)
129 		return -ENOMEM;
130 
131 	return 0;
132 }
133