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   1 /*
   2  * File:         arch/blackfin/mach-bf561/coreb.c
   3  * Based on:
   4  * Author:
   5  *
   6  * Created:
   7  * Description:  Handle CoreB on a BF561
   8  *
   9  * Modified:
  10  *               Copyright 2004-2006 Analog Devices Inc.
  11  *
  12  * Bugs:         Enter bugs at http://blackfin.uclinux.org/
  13  *
  14  * This program is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License as published by
  16  * the Free Software Foundation; either version 2 of the License, or
  17  * (at your option) any later version.
  18  *
  19  * This program is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with this program; if not, see the file COPYING, or write
  26  * to the Free Software Foundation, Inc.,
  27  * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  28  */
  29
  30 #include <linux/mm.h>
  31 #include <linux/miscdevice.h>
  32 #include <linux/device.h>
  33 #include <linux/ioport.h>
  34 #include <linux/module.h>
  35 #include <linux/uaccess.h>
  36 #include <asm/dma.h>
  37
  38 #define MODULE_VER              "v0.1"
  39
  40 static spinlock_t coreb_lock;
  41 static wait_queue_head_t coreb_dma_wait;
  42
  43 #define COREB_IS_OPEN           0x00000001
  44 #define COREB_IS_RUNNING        0x00000010
  45
  46 #define CMD_COREB_INDEX         1
  47 #define CMD_COREB_START         2
  48 #define CMD_COREB_STOP          3
  49 #define CMD_COREB_RESET         4
  50
  51 #define COREB_MINOR             229
  52
  53 static unsigned long coreb_status = 0;
  54 static unsigned long coreb_base = 0xff600000;
  55 static unsigned long coreb_size = 0x4000;
  56 int coreb_dma_done;
  57
  58 static loff_t coreb_lseek(struct file *file, loff_t offset, int origin);
  59 static ssize_t coreb_read(struct file *file, char *buf, size_t count,
  60                           loff_t * ppos);
  61 static ssize_t coreb_write(struct file *file, const char *buf, size_t count,
  62                            loff_t * ppos);
  63 static int coreb_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
  64                        unsigned long arg);
  65 static int coreb_open(struct inode *inode, struct file *file);
  66 static int coreb_release(struct inode *inode, struct file *file);
  67
  68 static irqreturn_t coreb_dma_interrupt(int irq, void *dev_id)
  69 {
  70         clear_dma_irqstat(CH_MEM_STREAM2_DEST);
  71         coreb_dma_done = 1;
  72         wake_up_interruptible(&coreb_dma_wait);
  73         return IRQ_HANDLED;
  74 }
  75
  76 static ssize_t coreb_write(struct file *file, const char *buf, size_t count,
  77                            loff_t * ppos)
  78 {
  79         unsigned long p = *ppos;
  80         ssize_t wrote = 0;
  81
  82         if (p + count > coreb_size)
  83                 return -EFAULT;
  84
  85         while (count > 0) {
  86                 int len = count;
  87
  88                 if (len > PAGE_SIZE)
  89                         len = PAGE_SIZE;
  90
  91                 coreb_dma_done = 0;
  92
  93                 /* Source Channel */
  94                 set_dma_start_addr(CH_MEM_STREAM2_SRC, (unsigned long)buf);
  95                 set_dma_x_count(CH_MEM_STREAM2_SRC, len);
  96                 set_dma_x_modify(CH_MEM_STREAM2_SRC, sizeof(char));
  97                 set_dma_config(CH_MEM_STREAM2_SRC, RESTART);
  98                 /* Destination Channel */
  99                 set_dma_start_addr(CH_MEM_STREAM2_DEST, coreb_base + p);
 100                 set_dma_x_count(CH_MEM_STREAM2_DEST, len);
 101                 set_dma_x_modify(CH_MEM_STREAM2_DEST, sizeof(char));
 102                 set_dma_config(CH_MEM_STREAM2_DEST, WNR | RESTART | DI_EN);
 103
 104                 enable_dma(CH_MEM_STREAM2_SRC);
 105                 enable_dma(CH_MEM_STREAM2_DEST);
 106
 107                 wait_event_interruptible(coreb_dma_wait, coreb_dma_done);
 108
 109                 disable_dma(CH_MEM_STREAM2_SRC);
 110                 disable_dma(CH_MEM_STREAM2_DEST);
 111
 112                 count -= len;
 113                 wrote += len;
 114                 buf += len;
 115                 p += len;
 116         }
 117         *ppos = p;
 118         return wrote;
 119 }
 120
 121 static ssize_t coreb_read(struct file *file, char *buf, size_t count,
 122                           loff_t * ppos)
 123 {
 124         unsigned long p = *ppos;
 125         ssize_t read = 0;
 126
 127         if ((p + count) > coreb_size)
 128                 return -EFAULT;
 129
 130         while (count > 0) {
 131                 int len = count;
 132
 133                 if (len > PAGE_SIZE)
 134                         len = PAGE_SIZE;
 135
 136                 coreb_dma_done = 0;
 137
 138                 /* Source Channel */
 139                 set_dma_start_addr(CH_MEM_STREAM2_SRC, coreb_base + p);
 140                 set_dma_x_count(CH_MEM_STREAM2_SRC, len);
 141                 set_dma_x_modify(CH_MEM_STREAM2_SRC, sizeof(char));
 142                 set_dma_config(CH_MEM_STREAM2_SRC, RESTART);
 143                 /* Destination Channel */
 144                 set_dma_start_addr(CH_MEM_STREAM2_DEST, (unsigned long)buf);
 145                 set_dma_x_count(CH_MEM_STREAM2_DEST, len);
 146                 set_dma_x_modify(CH_MEM_STREAM2_DEST, sizeof(char));
 147                 set_dma_config(CH_MEM_STREAM2_DEST, WNR | RESTART | DI_EN);
 148
 149                 enable_dma(CH_MEM_STREAM2_SRC);
 150                 enable_dma(CH_MEM_STREAM2_DEST);
 151
 152                 wait_event_interruptible(coreb_dma_wait, coreb_dma_done);
 153
 154                 disable_dma(CH_MEM_STREAM2_SRC);
 155                 disable_dma(CH_MEM_STREAM2_DEST);
 156
 157                 count -= len;
 158                 read += len;
 159                 buf += len;
 160                 p += len;
 161         }
 162
 163         return read;
 164 }
 165
 166 static loff_t coreb_lseek(struct file *file, loff_t offset, int origin)
 167 {
 168         loff_t ret;
 169
 170         mutex_lock(&file->f_dentry->d_inode->i_mutex);
 171
 172         switch (origin) {
 173         case 0 /* SEEK_SET */ :
 174                 if (offset < coreb_size) {
 175                         file->f_pos = offset;
 176                         ret = file->f_pos;
 177                 } else
 178                         ret = -EINVAL;
 179                 break;
 180         case 1 /* SEEK_CUR */ :
 181                 if ((offset + file->f_pos) < coreb_size) {
 182                         file->f_pos += offset;
 183                         ret = file->f_pos;
 184                 } else
 185                         ret = -EINVAL;
 186         default:
 187                 ret = -EINVAL;
 188         }
 189         mutex_unlock(&file->f_dentry->d_inode->i_mutex);
 190         return ret;
 191 }
 192
 193 static int coreb_open(struct inode *inode, struct file *file)
 194 {
 195         spin_lock_irq(&coreb_lock);
 196
 197         if (coreb_status & COREB_IS_OPEN)
 198                 goto out_busy;
 199
 200         coreb_status |= COREB_IS_OPEN;
 201
 202         spin_unlock_irq(&coreb_lock);
 203         return 0;
 204
 205  out_busy:
 206         spin_unlock_irq(&coreb_lock);
 207         return -EBUSY;
 208 }
 209
 210 static int coreb_release(struct inode *inode, struct file *file)
 211 {
 212         spin_lock_irq(&coreb_lock);
 213         coreb_status &= ~COREB_IS_OPEN;
 214         spin_unlock_irq(&coreb_lock);
 215         return 0;
 216 }
 217
 218 static int coreb_ioctl(struct inode *inode, struct file *file,
 219                        unsigned int cmd, unsigned long arg)
 220 {
 221         int retval = 0;
 222         int coreb_index = 0;
 223
 224         switch (cmd) {
 225         case CMD_COREB_INDEX:
 226                 if (copy_from_user(&coreb_index, (int *)arg, sizeof(int))) {
 227                         retval = -EFAULT;
 228                         break;
 229                 }
 230
 231                 spin_lock_irq(&coreb_lock);
 232                 switch (coreb_index) {
 233                 case 0:
 234                         coreb_base = 0xff600000;
 235                         coreb_size = 0x4000;
 236                         break;
 237                 case 1:
 238                         coreb_base = 0xff610000;
 239                         coreb_size = 0x4000;
 240                         break;
 241                 case 2:
 242                         coreb_base = 0xff500000;
 243                         coreb_size = 0x8000;
 244                         break;
 245                 case 3:
 246                         coreb_base = 0xff400000;
 247                         coreb_size = 0x8000;
 248                         break;
 249                 default:
 250                         retval = -EINVAL;
 251                         break;
 252                 }
 253                 spin_unlock_irq(&coreb_lock);
 254
 255                 mutex_lock(&file->f_dentry->d_inode->i_mutex);
 256                 file->f_pos = 0;
 257                 mutex_unlock(&file->f_dentry->d_inode->i_mutex);
 258                 break;
 259         case CMD_COREB_START:
 260                 spin_lock_irq(&coreb_lock);
 261                 if (coreb_status & COREB_IS_RUNNING) {
 262                         retval = -EBUSY;
 263                         break;
 264                 }
 265                 printk(KERN_INFO "Starting Core B\n");
 266                 coreb_status |= COREB_IS_RUNNING;
 267                 bfin_write_SICA_SYSCR(bfin_read_SICA_SYSCR() & ~0x0020);
 268                 SSYNC();
 269                 spin_lock_irq(&coreb_lock);
 270                 break;
 271 #if defined(CONFIG_BF561_COREB_RESET)
 272         case CMD_COREB_STOP:
 273                 spin_lock_irq(&coreb_lock);
 274                 printk(KERN_INFO "Stopping Core B\n");
 275                 bfin_write_SICA_SYSCR(bfin_read_SICA_SYSCR() | 0x0020);
 276                 bfin_write_SICB_SYSCR(bfin_read_SICB_SYSCR() | 0x0080);
 277                 coreb_status &= ~COREB_IS_RUNNING;
 278                 spin_lock_irq(&coreb_lock);
 279                 break;
 280         case CMD_COREB_RESET:
 281                 printk(KERN_INFO "Resetting Core B\n");
 282                 bfin_write_SICB_SYSCR(bfin_read_SICB_SYSCR() | 0x0080);
 283                 break;
 284 #endif
 285         }
 286
 287         return retval;
 288 }
 289
 290 static struct file_operations coreb_fops = {
 291         .owner = THIS_MODULE,
 292         .llseek = coreb_lseek,
 293         .read = coreb_read,
 294         .write = coreb_write,
 295         .ioctl = coreb_ioctl,
 296         .open = coreb_open,
 297         .release = coreb_release
 298 };
 299
 300 static struct miscdevice coreb_dev = {
 301         COREB_MINOR,
 302         "coreb",
 303         &coreb_fops
 304 };
 305
 306 static ssize_t coreb_show_status(struct device *dev, struct device_attribute *attr, char *buf)
 307 {
 308         return sprintf(buf,
 309                        "Base Address:\t0x%08lx\n"
 310                        "Core B is %s\n"
 311                        "SICA_SYSCR:\t%04x\n"
 312                        "SICB_SYSCR:\t%04x\n"
 313                        "\n"
 314                        "IRQ Status:\tCore A\t\tCore B\n"
 315                        "ISR0:\t\t%08x\t\t%08x\n"
 316                        "ISR1:\t\t%08x\t\t%08x\n"
 317                        "IMASK0:\t\t%08x\t\t%08x\n"
 318                        "IMASK1:\t\t%08x\t\t%08x\n",
 319                        coreb_base,
 320                        coreb_status & COREB_IS_RUNNING ? "running" : "stalled",
 321                        bfin_read_SICA_SYSCR(), bfin_read_SICB_SYSCR(),
 322                        bfin_read_SICA_ISR0(), bfin_read_SICB_ISR0(),
 323                        bfin_read_SICA_ISR1(), bfin_read_SICB_ISR0(),
 324                        bfin_read_SICA_IMASK0(), bfin_read_SICB_IMASK0(),
 325                        bfin_read_SICA_IMASK1(), bfin_read_SICB_IMASK1());
 326 }
 327
 328 static DEVICE_ATTR(coreb_status, S_IRUGO, coreb_show_status, NULL);
 329
 330 int __init bf561_coreb_init(void)
 331 {
 332         init_waitqueue_head(&coreb_dma_wait);
 333
 334         spin_lock_init(&coreb_lock);
 335         /* Request the core memory regions for Core B */
 336         if (request_mem_region(0xff600000, 0x4000,
 337                                "Core B - Instruction SRAM") == NULL)
 338                 goto exit;
 339
 340         if (request_mem_region(0xFF610000, 0x4000,
 341                                "Core B - Instruction SRAM") == NULL)
 342                 goto release_instruction_a_sram;
 343
 344         if (request_mem_region(0xFF500000, 0x8000,
 345                                "Core B - Data Bank B SRAM") == NULL)
 346                 goto release_instruction_b_sram;
 347
 348         if (request_mem_region(0xff400000, 0x8000,
 349                                "Core B - Data Bank A SRAM") == NULL)
 350                 goto release_data_b_sram;
 351
 352         if (request_dma(CH_MEM_STREAM2_DEST, "Core B - DMA Destination") < 0)
 353                 goto release_data_a_sram;
 354
 355         if (request_dma(CH_MEM_STREAM2_SRC, "Core B - DMA Source") < 0)
 356                 goto release_dma_dest;
 357
 358         set_dma_callback(CH_MEM_STREAM2_DEST, coreb_dma_interrupt, NULL);
 359
 360         misc_register(&coreb_dev);
 361
 362         if (device_create_file(coreb_dev.this_device, &dev_attr_coreb_status))
 363                 goto release_dma_src;
 364
 365         printk(KERN_INFO "BF561 Core B driver %s initialized.\n", MODULE_VER);
 366         return 0;
 367
 368  release_dma_src:
 369         free_dma(CH_MEM_STREAM2_SRC);
 370  release_dma_dest:
 371         free_dma(CH_MEM_STREAM2_DEST);
 372  release_data_a_sram:
 373         release_mem_region(0xff400000, 0x8000);
 374  release_data_b_sram:
 375         release_mem_region(0xff500000, 0x8000);
 376  release_instruction_b_sram:
 377         release_mem_region(0xff610000, 0x4000);
 378  release_instruction_a_sram:
 379         release_mem_region(0xff600000, 0x4000);
 380  exit:
 381         return -ENOMEM;
 382 }
 383
 384 void __exit bf561_coreb_exit(void)
 385 {
 386         device_remove_file(coreb_dev.this_device, &dev_attr_coreb_status);
 387         misc_deregister(&coreb_dev);
 388
 389         release_mem_region(0xff610000, 0x4000);
 390         release_mem_region(0xff600000, 0x4000);
 391         release_mem_region(0xff500000, 0x8000);
 392         release_mem_region(0xff400000, 0x8000);
 393
 394         free_dma(CH_MEM_STREAM2_DEST);
 395         free_dma(CH_MEM_STREAM2_SRC);
 396 }
 397
 398 module_init(bf561_coreb_init);
 399 module_exit(bf561_coreb_exit);
 400
 401 MODULE_AUTHOR("Bas Vermeulen <bvermeul@blackstar.xs4all.nl>");
 402 MODULE_DESCRIPTION("BF561 Core B Support");