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#include <drm/drm_print.h>
16
17#include "armada_crtc.h"
18#include "armada_drm.h"
19
20static int armada_debugfs_gem_linear_show(struct seq_file *m, void *data)
21{
22 struct drm_info_node *node = m->private;
23 struct drm_device *dev = node->minor->dev;
24 struct armada_private *priv = drm_to_armada_dev(dev);
25 struct drm_printer p = drm_seq_file_printer(f: m);
26
27 mutex_lock(&priv->linear_lock);
28 drm_mm_print(mm: &priv->linear, p: &p);
29 mutex_unlock(lock: &priv->linear_lock);
30
31 return 0;
32}
33
34static int armada_debugfs_crtc_reg_show(struct seq_file *m, void *data)
35{
36 struct armada_crtc *dcrtc = m->private;
37 int i;
38
39 for (i = 0x84; i <= 0x1c4; i += 4) {
40 u32 v = readl_relaxed(dcrtc->base + i);
41 seq_printf(m, fmt: "0x%04x: 0x%08x\n", i, v);
42 }
43
44 return 0;
45}
46
47static int armada_debugfs_crtc_reg_open(struct inode *inode, struct file *file)
48{
49 return single_open(file, armada_debugfs_crtc_reg_show,
50 inode->i_private);
51}
52
53static int armada_debugfs_crtc_reg_write(struct file *file,
54 const char __user *ptr, size_t len, loff_t *off)
55{
56 struct armada_crtc *dcrtc;
57 unsigned long reg, mask, val;
58 char buf[32];
59 int ret;
60 u32 v;
61
62 if (*off != 0)
63 return 0;
64
65 if (len > sizeof(buf) - 1)
66 len = sizeof(buf) - 1;
67
68 ret = strncpy_from_user(dst: buf, src: ptr, count: len);
69 if (ret < 0)
70 return ret;
71 buf[len] = '\0';
72
73 if (sscanf(buf, "%lx %lx %lx", &reg, &mask, &val) != 3)
74 return -EINVAL;
75 if (reg < 0x84 || reg > 0x1c4 || reg & 3)
76 return -ERANGE;
77
78 dcrtc = ((struct seq_file *)file->private_data)->private;
79 v = readl(addr: dcrtc->base + reg);
80 v &= ~mask;
81 v |= val & mask;
82 writel(val: v, addr: dcrtc->base + reg);
83
84 return len;
85}
86
87static const struct file_operations armada_debugfs_crtc_reg_fops = {
88 .owner = THIS_MODULE,
89 .open = armada_debugfs_crtc_reg_open,
90 .read = seq_read,
91 .write = armada_debugfs_crtc_reg_write,
92 .llseek = seq_lseek,
93 .release = single_release,
94};
95
96void armada_drm_crtc_debugfs_init(struct armada_crtc *dcrtc)
97{
98 debugfs_create_file("armada-regs", 0600, dcrtc->crtc.debugfs_entry,
99 dcrtc, &armada_debugfs_crtc_reg_fops);
100}
101
102static struct drm_info_list armada_debugfs_list[] = {
103 { "gem_linear", armada_debugfs_gem_linear_show, 0 },
104};
105#define ARMADA_DEBUGFS_ENTRIES ARRAY_SIZE(armada_debugfs_list)
106
107int armada_drm_debugfs_init(struct drm_minor *minor)
108{
109 drm_debugfs_create_files(files: armada_debugfs_list, ARMADA_DEBUGFS_ENTRIES,
110 root: minor->debugfs_root, minor);
111
112 return 0;
113}
114

source code of linux/drivers/gpu/drm/armada/armada_debugfs.c