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 19 static 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 33 static 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 46 static 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 52 static 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", ®, &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 86 static 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 95 void 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 } 100 101 static 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) 105 106 int 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 } 113