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 <linux/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",      MUSB_FADDR,     8 },
  53         { "Power",      MUSB_POWER,     8 },
  54         { "Frame",      MUSB_FRAME,     16 },
  55         { "Index",      MUSB_INDEX,     8 },
  56         { "Testmode",   MUSB_TESTMODE,  8 },
  57         { "TxMaxPp",    MUSB_TXMAXP,    16 },
  58         { "TxCSRp",     MUSB_TXCSR,     16 },
  59         { "RxMaxPp",    MUSB_RXMAXP,    16 },
  60         { "RxCSR",      MUSB_RXCSR,     16 },
  61         { "RxCount",    MUSB_RXCOUNT,   16 },
  62         { "IntrRxE",    MUSB_INTRRXE,   16 },
  63         { "IntrTxE",    MUSB_INTRTXE,   16 },
  64         { "IntrUsbE",   MUSB_INTRUSBE,  8 },
  65         { "DevCtl",     MUSB_DEVCTL,    8 },
  66         { "VControl",   0x68,           32 },
  67         { "HWVers",     0x69,           16 },
  68         { "LinkInfo",   MUSB_LINKINFO,  8 },
  69         { "VPLen",      MUSB_VPLEN,     8 },
  70         { "HS_EOF1",    MUSB_HS_EOF1,   8 },
  71         { "FS_EOF1",    MUSB_FS_EOF1,   8 },
  72         { "LS_EOF1",    MUSB_LS_EOF1,   8 },
  73         { "SOFT_RST",   0x7F,           8 },
  74         { "DMA_CNTLch0",        0x204,  16 },
  75         { "DMA_ADDRch0",        0x208,  32 },
  76         { "DMA_COUNTch0",       0x20C,  32 },
  77         { "DMA_CNTLch1",        0x214,  16 },
  78         { "DMA_ADDRch1",        0x218,  32 },
  79         { "DMA_COUNTch1",       0x21C,  32 },
  80         { "DMA_CNTLch2",        0x224,  16 },
  81         { "DMA_ADDRch2",        0x228,  32 },
  82         { "DMA_COUNTch2",       0x22C,  32 },
  83         { "DMA_CNTLch3",        0x234,  16 },
  84         { "DMA_ADDRch3",        0x238,  32 },
  85         { "DMA_COUNTch3",       0x23C,  32 },
  86         { "DMA_CNTLch4",        0x244,  16 },
  87         { "DMA_ADDRch4",        0x248,  32 },
  88         { "DMA_COUNTch4",       0x24C,  32 },
  89         { "DMA_CNTLch5",        0x254,  16 },
  90         { "DMA_ADDRch5",        0x258,  32 },
  91         { "DMA_COUNTch5",       0x25C,  32 },
  92         { "DMA_CNTLch6",        0x264,  16 },
  93         { "DMA_ADDRch6",        0x268,  32 },
  94         { "DMA_COUNTch6",       0x26C,  32 },
  95         { "DMA_CNTLch7",        0x274,  16 },
  96         { "DMA_ADDRch7",        0x278,  32 },
  97         { "DMA_COUNTch7",       0x27C,  32 },
  98 #ifndef CONFIG_BLACKFIN
  99         { "ConfigData", MUSB_CONFIGDATA,8 },
 100         { "BabbleCtl",  MUSB_BABBLE_CTL,8 },
 101         { "TxFIFOsz",   MUSB_TXFIFOSZ,  8 },
 102         { "RxFIFOsz",   MUSB_RXFIFOSZ,  8 },
 103         { "TxFIFOadd",  MUSB_TXFIFOADD, 16 },
 104         { "RxFIFOadd",  MUSB_RXFIFOADD, 16 },
 105         { "EPInfo",     MUSB_EPINFO,    8 },
 106         { "RAMInfo",    MUSB_RAMINFO,   8 },
 107 #endif
 108         {  }    /* Terminating Entry */
 109 };
 110
 111 static int musb_regdump_show(struct seq_file *s, void *unused)
 112 {
 113         struct musb             *musb = s->private;
 114         unsigned                i;
 115
 116         seq_printf(s, "MUSB (M)HDRC Register Dump\n");
 117
 118         for (i = 0; i < ARRAY_SIZE(musb_regmap); i++) {
 119                 switch (musb_regmap[i].size) {
 120                 case 8:
 121                         seq_printf(s, "%-12s: %02x\n", musb_regmap[i].name,
 122                                         musb_readb(musb->mregs, musb_regmap[i].offset));
 123                         break;
 124                 case 16:
 125                         seq_printf(s, "%-12s: %04x\n", musb_regmap[i].name,
 126                                         musb_readw(musb->mregs, musb_regmap[i].offset));
 127                         break;
 128                 case 32:
 129                         seq_printf(s, "%-12s: %08x\n", musb_regmap[i].name,
 130                                         musb_readl(musb->mregs, musb_regmap[i].offset));
 131                         break;
 132                 }
 133         }
 134
 135         return 0;
 136 }
 137
 138 static int musb_regdump_open(struct inode *inode, struct file *file)
 139 {
 140         return single_open(file, musb_regdump_show, inode->i_private);
 141 }
 142
 143 static int musb_test_mode_show(struct seq_file *s, void *unused)
 144 {
 145         struct musb             *musb = s->private;
 146         unsigned                test;
 147
 148         test = musb_readb(musb->mregs, MUSB_TESTMODE);
 149
 150         if (test & MUSB_TEST_FORCE_HOST)
 151                 seq_printf(s, "force host\n");
 152
 153         if (test & MUSB_TEST_FIFO_ACCESS)
 154                 seq_printf(s, "fifo access\n");
 155
 156         if (test & MUSB_TEST_FORCE_FS)
 157                 seq_printf(s, "force full-speed\n");
 158
 159         if (test & MUSB_TEST_FORCE_HS)
 160                 seq_printf(s, "force high-speed\n");
 161
 162         if (test & MUSB_TEST_PACKET)
 163                 seq_printf(s, "test packet\n");
 164
 165         if (test & MUSB_TEST_K)
 166                 seq_printf(s, "test K\n");
 167
 168         if (test & MUSB_TEST_J)
 169                 seq_printf(s, "test J\n");
 170
 171         if (test & MUSB_TEST_SE0_NAK)
 172                 seq_printf(s, "test SE0 NAK\n");
 173
 174         return 0;
 175 }
 176
 177 static const struct file_operations musb_regdump_fops = {
 178         .open                   = musb_regdump_open,
 179         .read                   = seq_read,
 180         .llseek                 = seq_lseek,
 181         .release                = single_release,
 182 };
 183
 184 static int musb_test_mode_open(struct inode *inode, struct file *file)
 185 {
 186         return single_open(file, musb_test_mode_show, inode->i_private);
 187 }
 188
 189 static ssize_t musb_test_mode_write(struct file *file,
 190                 const char __user *ubuf, size_t count, loff_t *ppos)
 191 {
 192         struct seq_file         *s = file->private_data;
 193         struct musb             *musb = s->private;
 194         u8                      test;
 195         char                    buf[18];
 196
 197         test = musb_readb(musb->mregs, MUSB_TESTMODE);
 198         if (test) {
 199                 dev_err(musb->controller, "Error: test mode is already set. "
 200                         "Please do USB Bus Reset to start a new test.\n");
 201                 return count;
 202         }
 203
 204         memset(buf, 0x00, sizeof(buf));
 205
 206         if (copy_from_user(buf, ubuf, min_t(size_t, sizeof(buf) - 1, count)))
 207                 return -EFAULT;
 208
 209         if (strstarts(buf, "force host"))
 210                 test = MUSB_TEST_FORCE_HOST;
 211
 212         if (strstarts(buf, "fifo access"))
 213                 test = MUSB_TEST_FIFO_ACCESS;
 214
 215         if (strstarts(buf, "force full-speed"))
 216                 test = MUSB_TEST_FORCE_FS;
 217
 218         if (strstarts(buf, "force high-speed"))
 219                 test = MUSB_TEST_FORCE_HS;
 220
 221         if (strstarts(buf, "test packet")) {
 222                 test = MUSB_TEST_PACKET;
 223                 musb_load_testpacket(musb);
 224         }
 225
 226         if (strstarts(buf, "test K"))
 227                 test = MUSB_TEST_K;
 228
 229         if (strstarts(buf, "test J"))
 230                 test = MUSB_TEST_J;
 231
 232         if (strstarts(buf, "test SE0 NAK"))
 233                 test = MUSB_TEST_SE0_NAK;
 234
 235         musb_writeb(musb->mregs, MUSB_TESTMODE, test);
 236
 237         return count;
 238 }
 239
 240 static const struct file_operations musb_test_mode_fops = {
 241         .open                   = musb_test_mode_open,
 242         .write                  = musb_test_mode_write,
 243         .read                   = seq_read,
 244         .llseek                 = seq_lseek,
 245         .release                = single_release,
 246 };
 247
 248 static int musb_softconnect_show(struct seq_file *s, void *unused)
 249 {
 250         struct musb     *musb = s->private;
 251         u8              reg;
 252         int             connect;
 253
 254         switch (musb->xceiv->otg->state) {
 255         case OTG_STATE_A_HOST:
 256         case OTG_STATE_A_WAIT_BCON:
 257                 reg = musb_readb(musb->mregs, MUSB_DEVCTL);
 258                 connect = reg & MUSB_DEVCTL_SESSION ? 1 : 0;
 259                 break;
 260         default:
 261                 connect = -1;
 262         }
 263
 264         seq_printf(s, "%d\n", connect);
 265
 266         return 0;
 267 }
 268
 269 static int musb_softconnect_open(struct inode *inode, struct file *file)
 270 {
 271         return single_open(file, musb_softconnect_show, inode->i_private);
 272 }
 273
 274 static ssize_t musb_softconnect_write(struct file *file,
 275                 const char __user *ubuf, size_t count, loff_t *ppos)
 276 {
 277         struct seq_file         *s = file->private_data;
 278         struct musb             *musb = s->private;
 279         char                    buf[2];
 280         u8                      reg;
 281
 282         memset(buf, 0x00, sizeof(buf));
 283
 284         if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count)))
 285                 return -EFAULT;
 286
 287         if (!strncmp(buf, "0", 1)) {
 288                 switch (musb->xceiv->otg->state) {
 289                 case OTG_STATE_A_HOST:
 290                         musb_root_disconnect(musb);
 291                         reg = musb_readb(musb->mregs, MUSB_DEVCTL);
 292                         reg &= ~MUSB_DEVCTL_SESSION;
 293                         musb_writeb(musb->mregs, MUSB_DEVCTL, reg);
 294                         break;
 295                 default:
 296                         break;
 297                 }
 298         } else if (!strncmp(buf, "1", 1)) {
 299                 switch (musb->xceiv->otg->state) {
 300                 case OTG_STATE_A_WAIT_BCON:
 301                         /*
 302                          * musb_save_context() called in musb_runtime_suspend()
 303                          * might cache devctl with SESSION bit cleared during
 304                          * soft-disconnect, so specifically set SESSION bit
 305                          * here to preserve it for musb_runtime_resume().
 306                          */
 307                         musb->context.devctl |= MUSB_DEVCTL_SESSION;
 308                         reg = musb_readb(musb->mregs, MUSB_DEVCTL);
 309                         reg |= MUSB_DEVCTL_SESSION;
 310                         musb_writeb(musb->mregs, MUSB_DEVCTL, reg);
 311                         break;
 312                 default:
 313                         break;
 314                 }
 315         }
 316
 317         return count;
 318 }
 319
 320 /*
 321  * In host mode, connect/disconnect the bus without physically
 322  * remove the devices.
 323  */
 324 static const struct file_operations musb_softconnect_fops = {
 325         .open                   = musb_softconnect_open,
 326         .write                  = musb_softconnect_write,
 327         .read                   = seq_read,
 328         .llseek                 = seq_lseek,
 329         .release                = single_release,
 330 };
 331
 332 int musb_init_debugfs(struct musb *musb)
 333 {
 334         struct dentry           *root;
 335         struct dentry           *file;
 336         int                     ret;
 337
 338         root = debugfs_create_dir(dev_name(musb->controller), NULL);
 339         if (!root) {
 340                 ret = -ENOMEM;
 341                 goto err0;
 342         }
 343
 344         file = debugfs_create_file("regdump", S_IRUGO, root, musb,
 345                         &musb_regdump_fops);
 346         if (!file) {
 347                 ret = -ENOMEM;
 348                 goto err1;
 349         }
 350
 351         file = debugfs_create_file("testmode", S_IRUGO | S_IWUSR,
 352                         root, musb, &musb_test_mode_fops);
 353         if (!file) {
 354                 ret = -ENOMEM;
 355                 goto err1;
 356         }
 357
 358         file = debugfs_create_file("softconnect", S_IRUGO | S_IWUSR,
 359                         root, musb, &musb_softconnect_fops);
 360         if (!file) {
 361                 ret = -ENOMEM;
 362                 goto err1;
 363         }
 364
 365         musb->debugfs_root = root;
 366
 367         return 0;
 368
 369 err1:
 370         debugfs_remove_recursive(root);
 371
 372 err0:
 373         return ret;
 374 }
 375
 376 void /* __init_or_exit */ musb_exit_debugfs(struct musb *musb)
 377 {
 378         debugfs_remove_recursive(musb->debugfs_root);
 379 }