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
armada_debugfs_gem_linear_show(struct seq_file * m,void * data)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
armada_debugfs_reg_show(struct seq_file * m,void * data)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
armada_debugfs_reg_r_open(struct inode * inode,struct file * file)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
armada_debugfs_write(struct file * file,const char __user * ptr,size_t len,loff_t * off)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
armada_drm_debugfs_init(struct drm_minor * minor)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