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/debugfs.h>
9 #include <linux/module.h>
10 #include <linux/seq_file.h>
11 #include <linux/uaccess.h>
12
13 #include <drm/drm_debugfs.h>
14 #include <drm/drm_file.h>
15
16 #include "armada_crtc.h"
17 #include "armada_drm.h"
18
armada_debugfs_gem_linear_show(struct seq_file * m,void * data)19 static int armada_debugfs_gem_linear_show(struct seq_file *m, void *data)
20 {
21 struct drm_info_node *node = m->private;
22 struct drm_device *dev = node->minor->dev;
23 struct armada_private *priv = drm_to_armada_dev(dev);
24 struct drm_printer p = drm_seq_file_printer(m);
25
26 mutex_lock(&priv->linear_lock);
27 drm_mm_print(&priv->linear, &p);
28 mutex_unlock(&priv->linear_lock);
29
30 return 0;
31 }
32
armada_debugfs_crtc_reg_show(struct seq_file * m,void * data)33 static int armada_debugfs_crtc_reg_show(struct seq_file *m, void *data)
34 {
35 struct armada_crtc *dcrtc = m->private;
36 int i;
37
38 for (i = 0x84; i <= 0x1c4; i += 4) {
39 u32 v = readl_relaxed(dcrtc->base + i);
40 seq_printf(m, "0x%04x: 0x%08x\n", i, v);
41 }
42
43 return 0;
44 }
45
armada_debugfs_crtc_reg_open(struct inode * inode,struct file * file)46 static int armada_debugfs_crtc_reg_open(struct inode *inode, struct file *file)
47 {
48 return single_open(file, armada_debugfs_crtc_reg_show,
49 inode->i_private);
50 }
51
armada_debugfs_crtc_reg_write(struct file * file,const char __user * ptr,size_t len,loff_t * off)52 static int armada_debugfs_crtc_reg_write(struct file *file,
53 const char __user *ptr, size_t len, loff_t *off)
54 {
55 struct armada_crtc *dcrtc;
56 unsigned long reg, mask, val;
57 char buf[32];
58 int ret;
59 u32 v;
60
61 if (*off != 0)
62 return 0;
63
64 if (len > sizeof(buf) - 1)
65 len = sizeof(buf) - 1;
66
67 ret = strncpy_from_user(buf, ptr, len);
68 if (ret < 0)
69 return ret;
70 buf[len] = '\0';
71
72 if (sscanf(buf, "%lx %lx %lx", ®, &mask, &val) != 3)
73 return -EINVAL;
74 if (reg < 0x84 || reg > 0x1c4 || reg & 3)
75 return -ERANGE;
76
77 dcrtc = ((struct seq_file *)file->private_data)->private;
78 v = readl(dcrtc->base + reg);
79 v &= ~mask;
80 v |= val & mask;
81 writel(v, dcrtc->base + reg);
82
83 return len;
84 }
85
86 static const struct file_operations armada_debugfs_crtc_reg_fops = {
87 .owner = THIS_MODULE,
88 .open = armada_debugfs_crtc_reg_open,
89 .read = seq_read,
90 .write = armada_debugfs_crtc_reg_write,
91 .llseek = seq_lseek,
92 .release = single_release,
93 };
94
armada_drm_crtc_debugfs_init(struct armada_crtc * dcrtc)95 void armada_drm_crtc_debugfs_init(struct armada_crtc *dcrtc)
96 {
97 debugfs_create_file("armada-regs", 0600, dcrtc->crtc.debugfs_entry,
98 dcrtc, &armada_debugfs_crtc_reg_fops);
99 }
100
101 static struct drm_info_list armada_debugfs_list[] = {
102 { "gem_linear", armada_debugfs_gem_linear_show, 0 },
103 };
104 #define ARMADA_DEBUGFS_ENTRIES ARRAY_SIZE(armada_debugfs_list)
105
armada_drm_debugfs_init(struct drm_minor * minor)106 int armada_drm_debugfs_init(struct drm_minor *minor)
107 {
108 drm_debugfs_create_files(armada_debugfs_list, ARMADA_DEBUGFS_ENTRIES,
109 minor->debugfs_root, minor);
110
111 return 0;
112 }
113