drivers/usb/musb/musb_debugfs.c

   1 /*
   2  * MUSB OTG driver debugfs support
   3  *
   4  * Copyright 2010 Nokia Corporation
   5  * Contact: Felipe Balbi <felipe.balbi@nokia.com>
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License
   9  * version 2 as published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  19  * 02110-1301 USA
  20  *
  21  * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
  22  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  23  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
  24  * NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  25  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  26  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
  27  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
  28  * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  30  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  31  *
  32  */
  33
  34 #include <linux/module.h>
  35 #include <linux/kernel.h>
  36 #include <linux/init.h>
  37 #include <linux/debugfs.h>
  38 #include <linux/seq_file.h>
  39
  40 #include <asm/uaccess.h>
  41
  42 #include "musb_core.h"
  43 #include "musb_debug.h"
  44
  45 struct musb_register_map {
  46         char                    *name;
  47         unsigned                offset;
  48         unsigned                size;
  49 };
  50
  51 static const struct musb_register_map musb_regmap[] = {
  52         { "FAddr",              0x00,   8 },
  53         { "Power",              0x01,   8 },
  54         { "Frame",              0x0c,   16 },
  55         { "Index",              0x0e,   8 },
  56         { "Testmode",           0x0f,   8 },
  57         { "TxMaxPp",            0x10,   16 },
  58         { "TxCSRp",             0x12,   16 },
  59         { "RxMaxPp",            0x14,   16 },
  60         { "RxCSR",              0x16,   16 },
  61         { "RxCount",            0x18,   16 },
  62         { "ConfigData",         0x1f,   8 },
  63         { "DevCtl",             0x60,   8 },
  64         { "MISC",               0x61,   8 },
  65         { "TxFIFOsz",           0x62,   8 },
  66         { "RxFIFOsz",           0x63,   8 },
  67         { "TxFIFOadd",          0x64,   16 },
  68         { "RxFIFOadd",          0x66,   16 },
  69         { "VControl",           0x68,   32 },
  70         { "HWVers",             0x6C,   16 },
  71         { "EPInfo",             0x78,   8 },
  72         { "RAMInfo",            0x79,   8 },
  73         { "LinkInfo",           0x7A,   8 },
  74         { "VPLen",              0x7B,   8 },
  75         { "HS_EOF1",            0x7C,   8 },
  76         { "FS_EOF1",            0x7D,   8 },
  77         { "LS_EOF1",            0x7E,   8 },
  78         { "SOFT_RST",           0x7F,   8 },
  79         { "DMA_CNTLch0",        0x204,  16 },
  80         { "DMA_ADDRch0",        0x208,  32 },
  81         { "DMA_COUNTch0",       0x20C,  32 },
  82         { "DMA_CNTLch1",        0x214,  16 },
  83         { "DMA_ADDRch1",        0x218,  32 },
  84         { "DMA_COUNTch1",       0x21C,  32 },
  85         { "DMA_CNTLch2",        0x224,  16 },
  86         { "DMA_ADDRch2",        0x228,  32 },
  87         { "DMA_COUNTch2",       0x22C,  32 },
  88         { "DMA_CNTLch3",        0x234,  16 },
  89         { "DMA_ADDRch3",        0x238,  32 },
  90         { "DMA_COUNTch3",       0x23C,  32 },
  91         { "DMA_CNTLch4",        0x244,  16 },
  92         { "DMA_ADDRch4",        0x248,  32 },
  93         { "DMA_COUNTch4",       0x24C,  32 },
  94         { "DMA_CNTLch5",        0x254,  16 },
  95         { "DMA_ADDRch5",        0x258,  32 },
  96         { "DMA_COUNTch5",       0x25C,  32 },
  97         { "DMA_CNTLch6",        0x264,  16 },
  98         { "DMA_ADDRch6",        0x268,  32 },
  99         { "DMA_COUNTch6",       0x26C,  32 },
 100         { "DMA_CNTLch7",        0x274,  16 },
 101         { "DMA_ADDRch7",        0x278,  32 },
 102         { "DMA_COUNTch7",       0x27C,  32 },
 103         {  }    /* Terminating Entry */
 104 };
 105
 106 static struct dentry *musb_debugfs_root;
 107
 108 static int musb_regdump_show(struct seq_file *s, void *unused)
 109 {
 110         struct musb             *musb = s->private;
 111         unsigned                i;
 112
 113         seq_printf(s, "MUSB (M)HDRC Register Dump\n");
 114
 115         for (i = 0; i < ARRAY_SIZE(musb_regmap); i++) {
 116                 switch (musb_regmap[i].size) {
 117                 case 8:
 118                         seq_printf(s, "%-12s: %02x\n", musb_regmap[i].name,
 119                                         musb_readb(musb->mregs, musb_regmap[i].offset));
 120                         break;
 121                 case 16:
 122                         seq_printf(s, "%-12s: %04x\n", musb_regmap[i].name,
 123                                         musb_readw(musb->mregs, musb_regmap[i].offset));
 124                         break;
 125                 case 32:
 126                         seq_printf(s, "%-12s: %08x\n", musb_regmap[i].name,
 127                                         musb_readl(musb->mregs, musb_regmap[i].offset));
 128                         break;
 129                 }
 130         }
 131
 132         return 0;
 133 }
 134
 135 static int musb_regdump_open(struct inode *inode, struct file *file)
 136 {
 137         return single_open(file, musb_regdump_show, inode->i_private);
 138 }
 139
 140 static int musb_test_mode_show(struct seq_file *s, void *unused)
 141 {
 142         struct musb             *musb = s->private;
 143         unsigned                test;
 144
 145         test = musb_readb(musb->mregs, MUSB_TESTMODE);
 146
 147         if (test & MUSB_TEST_FORCE_HOST)
 148                 seq_printf(s, "force host\n");
 149
 150         if (test & MUSB_TEST_FIFO_ACCESS)
 151                 seq_printf(s, "fifo access\n");
 152
 153         if (test & MUSB_TEST_FORCE_FS)
 154                 seq_printf(s, "force full-speed\n");
 155
 156         if (test & MUSB_TEST_FORCE_HS)
 157                 seq_printf(s, "force high-speed\n");
 158
 159         if (test & MUSB_TEST_PACKET)
 160                 seq_printf(s, "test packet\n");
 161
 162         if (test & MUSB_TEST_K)
 163                 seq_printf(s, "test K\n");
 164
 165         if (test & MUSB_TEST_J)
 166                 seq_printf(s, "test J\n");
 167
 168         if (test & MUSB_TEST_SE0_NAK)
 169                 seq_printf(s, "test SE0 NAK\n");
 170
 171         return 0;
 172 }
 173
 174 static const struct file_operations musb_regdump_fops = {
 175         .open                   = musb_regdump_open,
 176         .read                   = seq_read,
 177         .llseek                 = seq_lseek,
 178         .release                = single_release,
 179 };
 180
 181 static int musb_test_mode_open(struct inode *inode, struct file *file)
 182 {
 183         return single_open(file, musb_test_mode_show, inode->i_private);
 184 }
 185
 186 static ssize_t musb_test_mode_write(struct file *file,
 187                 const char __user *ubuf, size_t count, loff_t *ppos)
 188 {
 189         struct seq_file         *s = file->private_data;
 190         struct musb             *musb = s->private;
 191         u8                      test = 0;
 192         char                    buf[18];
 193
 194         memset(buf, 0x00, sizeof(buf));
 195
 196         if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count)))
 197                 return -EFAULT;
 198
 199         if (!strncmp(buf, "force host", 9))
 200                 test = MUSB_TEST_FORCE_HOST;
 201
 202         if (!strncmp(buf, "fifo access", 11))
 203                 test = MUSB_TEST_FIFO_ACCESS;
 204
 205         if (!strncmp(buf, "force full-speed", 15))
 206                 test = MUSB_TEST_FORCE_FS;
 207
 208         if (!strncmp(buf, "force high-speed", 15))
 209                 test = MUSB_TEST_FORCE_HS;
 210
 211         if (!strncmp(buf, "test packet", 10)) {
 212                 test = MUSB_TEST_PACKET;
 213                 musb_load_testpacket(musb);
 214         }
 215
 216         if (!strncmp(buf, "test K", 6))
 217                 test = MUSB_TEST_K;
 218
 219         if (!strncmp(buf, "test J", 6))
 220                 test = MUSB_TEST_J;
 221
 222         if (!strncmp(buf, "test SE0 NAK", 12))
 223                 test = MUSB_TEST_SE0_NAK;
 224
 225         musb_writeb(musb->mregs, MUSB_TESTMODE, test);
 226
 227         return count;
 228 }
 229
 230 static const struct file_operations musb_test_mode_fops = {
 231         .open                   = musb_test_mode_open,
 232         .write                  = musb_test_mode_write,
 233         .read                   = seq_read,
 234         .llseek                 = seq_lseek,
 235         .release                = single_release,
 236 };
 237
 238 int __init musb_init_debugfs(struct musb *musb)
 239 {
 240         struct dentry           *root;
 241         struct dentry           *file;
 242         int                     ret;
 243
 244         root = debugfs_create_dir("musb", NULL);
 245         if (IS_ERR(root)) {
 246                 ret = PTR_ERR(root);
 247                 goto err0;
 248         }
 249
 250         file = debugfs_create_file("regdump", S_IRUGO, root, musb,
 251                         &musb_regdump_fops);
 252         if (IS_ERR(file)) {
 253                 ret = PTR_ERR(file);
 254                 goto err1;
 255         }
 256
 257         file = debugfs_create_file("testmode", S_IRUGO | S_IWUSR,
 258                         root, musb, &musb_test_mode_fops);
 259         if (IS_ERR(file)) {
 260                 ret = PTR_ERR(file);
 261                 goto err1;
 262         }
 263
 264         musb_debugfs_root = root;
 265
 266         return 0;
 267
 268 err1:
 269         debugfs_remove_recursive(root);
 270
 271 err0:
 272         return ret;
 273 }
 274
 275 void /* __init_or_exit */ musb_exit_debugfs(struct musb *musb)
 276 {
 277         debugfs_remove_recursive(musb_debugfs_root);
 278 }