armada_debugfs.c

  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#include <drm/drm_print.h>
 16
 17#include "armada_crtc.h"
 18#include "armada_drm.h"
 19
 20static int armada_debugfs_gem_linear_show(struct seq_file *m, void *data)
 21{
 22	struct drm_info_node *node = m->private;
 23	struct drm_device *dev = node->minor->dev;
 24	struct armada_private *priv = drm_to_armada_dev(dev);
 25	struct drm_printer p = drm_seq_file_printer(m);
 26
 27	mutex_lock(&priv->linear_lock);
 28	drm_mm_print(&priv->linear, &p);
 29	mutex_unlock(&priv->linear_lock);
 30
 31	return 0;
 32}
 33
 34static int armada_debugfs_crtc_reg_show(struct seq_file *m, void *data)
 35{
 36	struct armada_crtc *dcrtc = m->private;
 37	int i;
 38
 39	for (i = 0x84; i <= 0x1c4; i += 4) {
 40		u32 v = readl_relaxed(dcrtc->base + i);
 41		seq_printf(m, "0x%04x: 0x%08x\n", i, v);
 42	}
 43
 44	return 0;
 45}
 46
 47static int armada_debugfs_crtc_reg_open(struct inode *inode, struct file *file)
 48{
 49	return single_open(file, armada_debugfs_crtc_reg_show,
 50			   inode->i_private);
 51}
 52
 53static int armada_debugfs_crtc_reg_write(struct file *file,
 54	const char __user *ptr, size_t len, loff_t *off)
 55{
 56	struct armada_crtc *dcrtc;
 57	unsigned long reg, mask, val;
 58	char buf[32];
 59	int ret;
 60	u32 v;
 61
 62	if (*off != 0)
 63		return 0;
 64
 65	if (len > sizeof(buf) - 1)
 66		len = sizeof(buf) - 1;
 67
 68	ret = strncpy_from_user(buf, ptr, len);
 69	if (ret < 0)
 70		return ret;
 71	buf[len] = '\0';
 72
 73	if (sscanf(buf, "%lx %lx %lx", &reg, &mask, &val) != 3)
 74		return -EINVAL;
 75	if (reg < 0x84 || reg > 0x1c4 || reg & 3)
 76		return -ERANGE;
 77
 78	dcrtc = ((struct seq_file *)file->private_data)->private;
 79	v = readl(dcrtc->base + reg);
 80	v &= ~mask;
 81	v |= val & mask;
 82	writel(v, dcrtc->base + reg);
 83
 84	return len;
 85}
 86
 87static const struct file_operations armada_debugfs_crtc_reg_fops = {
 88	.owner = THIS_MODULE,
 89	.open = armada_debugfs_crtc_reg_open,
 90	.read = seq_read,
 91	.write = armada_debugfs_crtc_reg_write,
 92	.llseek = seq_lseek,
 93	.release = single_release,
 94};
 95
 96void armada_drm_crtc_debugfs_init(struct armada_crtc *dcrtc)
 97{
 98	debugfs_create_file("armada-regs", 0600, dcrtc->crtc.debugfs_entry,
 99			    dcrtc, &armada_debugfs_crtc_reg_fops);
100}
101
102static struct drm_info_list armada_debugfs_list[] = {
103	{ "gem_linear", armada_debugfs_gem_linear_show, 0 },
104};
105#define ARMADA_DEBUGFS_ENTRIES ARRAY_SIZE(armada_debugfs_list)
106
107int armada_drm_debugfs_init(struct drm_minor *minor)
108{
109	drm_debugfs_create_files(armada_debugfs_list, ARMADA_DEBUGFS_ENTRIES,
110				 minor->debugfs_root, minor);
111
112	return 0;
113}