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 
18 static 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 
32 static 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 
45 static 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 
51 static 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 
85 static 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 
94 void 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 
100 static 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 
105 int 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