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 = drm_to_armada_dev(dev);
 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}