LXR linux/drivers/gpu/drm/armada/armada

   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        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
  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
 110int 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}
 133