drivers/gpu/drm/armada/armada_debugfs.c

   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
  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         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
  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
  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
  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
 110 static 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
 132 static 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
 142 int 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
 171 void 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 }