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

   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/module.h>
   9#include <linux/seq_file.h>
  10#include <linux/uaccess.h>
  11
  12#include <drm/drm_debugfs.h>
  13#include <drm/drm_file.h>
  14
  15#include "armada_crtc.h"
  16#include "armada_drm.h"
  17
  18static int armada_debugfs_gem_linear_show(struct seq_file *m, void *data)
  19{
  20        struct drm_info_node *node = m->private;
  21        struct drm_device *dev = node->minor->dev;
  22        struct armada_private *priv = dev->dev_private;
  23        struct drm_printer p = drm_seq_file_printer(m);
  24
  25        mutex_lock(&priv->linear_lock);
  26        drm_mm_print(&priv->linear, &p);
  27        mutex_unlock(&priv->linear_lock);
  28
  29        return 0;
  30}
  31
  32static int armada_debugfs_crtc_reg_show(struct seq_file *m, void *data)
  33{
  34        struct armada_crtc *dcrtc = m->private;
  35        int i;
  36
  37        for (i = 0x84; i <= 0x1c4; i += 4) {
  38                u32 v = readl_relaxed(dcrtc->base + i);
  39                seq_printf(m, "0x%04x: 0x%08x\n", i, v);
  40        }
  41
  42        return 0;
  43}
  44
  45static int armada_debugfs_crtc_reg_open(struct inode *inode, struct file *file)
  46{
  47        return single_open(file, armada_debugfs_crtc_reg_show,
  48                           inode->i_private);
  49}
  50
  51static int armada_debugfs_crtc_reg_write(struct file *file,
  52        const char __user *ptr, size_t len, loff_t *off)
  53{
  54        struct armada_crtc *dcrtc;
  55        unsigned long reg, mask, val;
  56        char buf[32];
  57        int ret;
  58        u32 v;
  59
  60        if (*off != 0)
  61                return 0;
  62
  63        if (len > sizeof(buf) - 1)
  64                len = sizeof(buf) - 1;
  65
  66        ret = strncpy_from_user(buf, ptr, len);
  67        if (ret < 0)
  68                return ret;
  69        buf[len] = '\0';
  70
  71        if (sscanf(buf, "%lx %lx %lx", &reg, &mask, &val) != 3)
  72                return -EINVAL;
  73        if (reg < 0x84 || reg > 0x1c4 || reg & 3)
  74                return -ERANGE;
  75
  76        dcrtc = ((struct seq_file *)file->private_data)->private;
  77        v = readl(dcrtc->base + reg);
  78        v &= ~mask;
  79        v |= val & mask;
  80        writel(v, dcrtc->base + reg);
  81
  82        return len;
  83}
  84
  85static const struct file_operations armada_debugfs_crtc_reg_fops = {
  86        .owner = THIS_MODULE,
  87        .open = armada_debugfs_crtc_reg_open,
  88        .read = seq_read,
  89        .write = armada_debugfs_crtc_reg_write,
  90        .llseek = seq_lseek,
  91        .release = single_release,
  92};
  93
  94void armada_drm_crtc_debugfs_init(struct armada_crtc *dcrtc)
  95{
  96        debugfs_create_file("armada-regs", 0600, dcrtc->crtc.debugfs_entry,
  97                            dcrtc, &armada_debugfs_crtc_reg_fops);
  98}
  99
 100static struct drm_info_list armada_debugfs_list[] = {
 101        { "gem_linear", armada_debugfs_gem_linear_show, 0 },
 102};
 103#define ARMADA_DEBUGFS_ENTRIES ARRAY_SIZE(armada_debugfs_list)
 104
 105int armada_drm_debugfs_init(struct drm_minor *minor)
 106{
 107        drm_debugfs_create_files(armada_debugfs_list, ARMADA_DEBUGFS_ENTRIES,
 108                                 minor->debugfs_root, minor);
 109
 110        return 0;
 111}
 112