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         struct drm_printer p = drm_seq_file_printer(m);
  23
  24         mutex_lock(&priv->linear_lock);
  25         drm_mm_print(&priv->linear, &p);
  26         mutex_unlock(&priv->linear_lock);
  27
  28         return 0;
  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 int armada_drm_debugfs_init(struct drm_minor *minor)
 111 {
 112         struct dentry *de;
 113         int ret;
 114
 115         ret = drm_debugfs_create_files(armada_debugfs_list,
 116                                        ARMADA_DEBUGFS_ENTRIES,
 117                                        minor->debugfs_root, minor);
 118         if (ret)
 119                 return ret;
 120
 121         de = debugfs_create_file("reg", S_IFREG | S_IRUSR,
 122                                  minor->debugfs_root, minor->dev, &fops_reg_r);
 123         if (!de)
 124                 return -ENOMEM;
 125
 126         de = debugfs_create_file("reg_wr", S_IFREG | S_IWUSR,
 127                                  minor->debugfs_root, minor->dev, &fops_reg_w);
 128         if (!de)
 129                 return -ENOMEM;
 130
 131         return 0;
 132 }