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
 17static 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	int ret;
 23
 24	mutex_lock(&priv->linear_lock);
 25	ret = drm_mm_dump_table(m, &priv->linear);
 26	mutex_unlock(&priv->linear_lock);
 27
 28	return ret;
 29}
 30
 31static 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
 53static 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
 58static 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
 66static 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
 98static 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
105static 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
110static int drm_add_fake_info_node(struct drm_minor *minor, struct dentry *ent,
111	const void *key)
112{
113	struct drm_info_node *node;
114
115	node = kmalloc(sizeof(struct drm_info_node), GFP_KERNEL);
116	if (node == NULL) {
117		debugfs_remove(ent);
118		return -ENOMEM;
119	}
120
121	node->minor = minor;
122	node->dent = ent;
123	node->info_ent = (void *) key;
124
125	mutex_lock(&minor->debugfs_lock);
126	list_add(&node->list, &minor->debugfs_list);
127	mutex_unlock(&minor->debugfs_lock);
128
129	return 0;
130}
131
132static int armada_debugfs_create(struct dentry *root, struct drm_minor *minor,
133	const char *name, umode_t mode, const struct file_operations *fops)
134{
135	struct dentry *de;
136
137	de = debugfs_create_file(name, mode, root, minor->dev, fops);
138
139	return drm_add_fake_info_node(minor, de, fops);
140}
141
142int armada_drm_debugfs_init(struct drm_minor *minor)
143{
144	int ret;
145
146	ret = drm_debugfs_create_files(armada_debugfs_list,
147				       ARMADA_DEBUGFS_ENTRIES,
148				       minor->debugfs_root, minor);
149	if (ret)
150		return ret;
151
152	ret = armada_debugfs_create(minor->debugfs_root, minor,
153				   "reg", S_IFREG | S_IRUSR, &fops_reg_r);
154	if (ret)
155		goto err_1;
156
157	ret = armada_debugfs_create(minor->debugfs_root, minor,
158				"reg_wr", S_IFREG | S_IWUSR, &fops_reg_w);
159	if (ret)
160		goto err_2;
161	return ret;
162
163 err_2:
164	drm_debugfs_remove_files((struct drm_info_list *)&fops_reg_r, 1, minor);
165 err_1:
166	drm_debugfs_remove_files(armada_debugfs_list, ARMADA_DEBUGFS_ENTRIES,
167				 minor);
168	return ret;
169}
170
171void armada_drm_debugfs_cleanup(struct drm_minor *minor)
172{
173	drm_debugfs_remove_files((struct drm_info_list *)&fops_reg_w, 1, minor);
174	drm_debugfs_remove_files((struct drm_info_list *)&fops_reg_r, 1, minor);
175	drm_debugfs_remove_files(armada_debugfs_list, ARMADA_DEBUGFS_ENTRIES,
176				 minor);
177}