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