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