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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 <linux/fs.h>
  37 #include <asm/dma.h>
  38 #include <asm/cacheflush.h>
  39
  40 #define MODULE_VER              "v0.1"
  41
  42 static spinlock_t coreb_lock;
  43 static wait_queue_head_t coreb_dma_wait;
  44
  45 #define COREB_IS_OPEN           0x00000001
  46 #define COREB_IS_RUNNING        0x00000010
  47
  48 #define CMD_COREB_INDEX         1
  49 #define CMD_COREB_START         2
  50 #define CMD_COREB_STOP          3
  51 #define CMD_COREB_RESET         4
  52
  53 #define COREB_MINOR             229
  54
  55 static unsigned long coreb_status = 0;
  56 static unsigned long coreb_base = 0xff600000;
  57 static unsigned long coreb_size = 0x4000;
  58 int coreb_dma_done;
  59
  60 static loff_t coreb_lseek(struct file *file, loff_t offset, int origin);
  61 static ssize_t coreb_read(struct file *file, char *buf, size_t count,
  62                           loff_t * ppos);
  63 static ssize_t coreb_write(struct file *file, const char *buf, size_t count,
  64                            loff_t * ppos);
  65 static int coreb_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
  66                        unsigned long arg);
  67 static int coreb_open(struct inode *inode, struct file *file);
  68 static int coreb_release(struct inode *inode, struct file *file);
  69
  70 static irqreturn_t coreb_dma_interrupt(int irq, void *dev_id)
  71 {
  72         clear_dma_irqstat(CH_MEM_STREAM2_DEST);
  73         coreb_dma_done = 1;
  74         wake_up_interruptible(&coreb_dma_wait);
  75         return IRQ_HANDLED;
  76 }
  77
  78 static ssize_t coreb_write(struct file *file, const char *buf, size_t count,
  79                            loff_t * ppos)
  80 {
  81         unsigned long p = *ppos;
  82         ssize_t wrote = 0;
  83
  84         if (p + count > coreb_size)
  85                 return -EFAULT;
  86
  87         while (count > 0) {
  88                 int len = count;
  89
  90                 if (len > PAGE_SIZE)
  91                         len = PAGE_SIZE;
  92
  93                 coreb_dma_done = 0;
  94
  95                 flush_dcache_range((unsigned long)buf, (unsigned long)(buf+len));
  96                 /* Source Channel */
  97                 set_dma_start_addr(CH_MEM_STREAM2_SRC, (unsigned long)buf);
  98                 set_dma_x_count(CH_MEM_STREAM2_SRC, len);
  99                 set_dma_x_modify(CH_MEM_STREAM2_SRC, sizeof(char));
 100                 set_dma_config(CH_MEM_STREAM2_SRC, 0);
 101                 /* Destination Channel */
 102                 set_dma_start_addr(CH_MEM_STREAM2_DEST, coreb_base + p);
 103                 set_dma_x_count(CH_MEM_STREAM2_DEST, len);
 104                 set_dma_x_modify(CH_MEM_STREAM2_DEST, sizeof(char));
 105                 set_dma_config(CH_MEM_STREAM2_DEST, WNR | RESTART | DI_EN);
 106
 107                 enable_dma(CH_MEM_STREAM2_SRC);
 108                 enable_dma(CH_MEM_STREAM2_DEST);
 109
 110                 wait_event_interruptible(coreb_dma_wait, coreb_dma_done);
 111
 112                 disable_dma(CH_MEM_STREAM2_SRC);
 113                 disable_dma(CH_MEM_STREAM2_DEST);
 114
 115                 count -= len;
 116                 wrote += len;
 117                 buf += len;
 118                 p += len;
 119         }
 120         *ppos = p;
 121         return wrote;
 122 }
 123
 124 static ssize_t coreb_read(struct file *file, char *buf, size_t count,
 125                           loff_t * ppos)
 126 {
 127         unsigned long p = *ppos;
 128         ssize_t read = 0;
 129
 130         if ((p + count) > coreb_size)
 131                 return -EFAULT;
 132
 133         while (count > 0) {
 134                 int len = count;
 135
 136                 if (len > PAGE_SIZE)
 137                         len = PAGE_SIZE;
 138
 139                 coreb_dma_done = 0;
 140
 141                 invalidate_dcache_range((unsigned long)buf, (unsigned long)(buf+len));
 142                 /* Source Channel */
 143                 set_dma_start_addr(CH_MEM_STREAM2_SRC, coreb_base + p);
 144                 set_dma_x_count(CH_MEM_STREAM2_SRC, len);
 145                 set_dma_x_modify(CH_MEM_STREAM2_SRC, sizeof(char));
 146                 set_dma_config(CH_MEM_STREAM2_SRC, 0);
 147                 /* Destination Channel */
 148                 set_dma_start_addr(CH_MEM_STREAM2_DEST, (unsigned long)buf);
 149                 set_dma_x_count(CH_MEM_STREAM2_DEST, len);
 150                 set_dma_x_modify(CH_MEM_STREAM2_DEST, sizeof(char));
 151                 set_dma_config(CH_MEM_STREAM2_DEST, WNR | RESTART | DI_EN);
 152
 153                 enable_dma(CH_MEM_STREAM2_SRC);
 154                 enable_dma(CH_MEM_STREAM2_DEST);
 155
 156                 wait_event_interruptible(coreb_dma_wait, coreb_dma_done);
 157
 158                 disable_dma(CH_MEM_STREAM2_SRC);
 159                 disable_dma(CH_MEM_STREAM2_DEST);
 160
 161                 count -= len;
 162                 read += len;
 163                 buf += len;
 164                 p += len;
 165         }
 166
 167         return read;
 168 }
 169
 170 static loff_t coreb_lseek(struct file *file, loff_t offset, int origin)
 171 {
 172         loff_t ret;
 173
 174         mutex_lock(&file->f_dentry->d_inode->i_mutex);
 175
 176         switch (origin) {
 177         case 0 /* SEEK_SET */ :
 178                 if (offset < coreb_size) {
 179                         file->f_pos = offset;
 180                         ret = file->f_pos;
 181                 } else
 182                         ret = -EINVAL;
 183                 break;
 184         case 1 /* SEEK_CUR */ :
 185                 if ((offset + file->f_pos) < coreb_size) {
 186                         file->f_pos += offset;
 187                         ret = file->f_pos;
 188                 } else
 189                         ret = -EINVAL;
 190         default:
 191                 ret = -EINVAL;
 192         }
 193         mutex_unlock(&file->f_dentry->d_inode->i_mutex);
 194         return ret;
 195 }
 196
 197 /* No BKL needed here */
 198 static int coreb_open(struct inode *inode, struct file *file)
 199 {
 200         spin_lock_irq(&coreb_lock);
 201
 202         if (coreb_status & COREB_IS_OPEN)
 203                 goto out_busy;
 204
 205         coreb_status |= COREB_IS_OPEN;
 206
 207         spin_unlock_irq(&coreb_lock);
 208         return 0;
 209
 210  out_busy:
 211         spin_unlock_irq(&coreb_lock);
 212         return -EBUSY;
 213 }
 214
 215 static int coreb_release(struct inode *inode, struct file *file)
 216 {
 217         spin_lock_irq(&coreb_lock);
 218         coreb_status &= ~COREB_IS_OPEN;
 219         spin_unlock_irq(&coreb_lock);
 220         return 0;
 221 }
 222
 223 static int coreb_ioctl(struct inode *inode, struct file *file,
 224                        unsigned int cmd, unsigned long arg)
 225 {
 226         int retval = 0;
 227         int coreb_index = 0;
 228
 229         switch (cmd) {
 230         case CMD_COREB_INDEX:
 231                 if (copy_from_user(&coreb_index, (int *)arg, sizeof(int))) {
 232                         retval = -EFAULT;
 233                         break;
 234                 }
 235
 236                 spin_lock_irq(&coreb_lock);
 237                 switch (coreb_index) {
 238                 case 0:
 239                         coreb_base = 0xff600000;
 240                         coreb_size = 0x4000;
 241                         break;
 242                 case 1:
 243                         coreb_base = 0xff610000;
 244                         coreb_size = 0x4000;
 245                         break;
 246                 case 2:
 247                         coreb_base = 0xff500000;
 248                         coreb_size = 0x8000;
 249                         break;
 250                 case 3:
 251                         coreb_base = 0xff400000;
 252                         coreb_size = 0x8000;
 253                         break;
 254                 default:
 255                         retval = -EINVAL;
 256                         break;
 257                 }
 258                 spin_unlock_irq(&coreb_lock);
 259
 260                 mutex_lock(&file->f_dentry->d_inode->i_mutex);
 261                 file->f_pos = 0;
 262                 mutex_unlock(&file->f_dentry->d_inode->i_mutex);
 263                 break;
 264         case CMD_COREB_START:
 265                 spin_lock_irq(&coreb_lock);
 266                 if (coreb_status & COREB_IS_RUNNING) {
 267                         retval = -EBUSY;
 268                         break;
 269                 }
 270                 printk(KERN_INFO "Starting Core B\n");
 271                 coreb_status |= COREB_IS_RUNNING;
 272                 bfin_write_SICA_SYSCR(bfin_read_SICA_SYSCR() & ~0x0020);
 273                 SSYNC();
 274                 spin_unlock_irq(&coreb_lock);
 275                 break;
 276 #if defined(CONFIG_BF561_COREB_RESET)
 277         case CMD_COREB_STOP:
 278                 spin_lock_irq(&coreb_lock);
 279                 printk(KERN_INFO "Stopping Core B\n");
 280                 bfin_write_SICA_SYSCR(bfin_read_SICA_SYSCR() | 0x0020);
 281                 bfin_write_SICB_SYSCR(bfin_read_SICB_SYSCR() | 0x0080);
 282                 coreb_status &= ~COREB_IS_RUNNING;
 283                 spin_unlock_irq(&coreb_lock);
 284                 break;
 285         case CMD_COREB_RESET:
 286                 printk(KERN_INFO "Resetting Core B\n");
 287                 bfin_write_SICB_SYSCR(bfin_read_SICB_SYSCR() | 0x0080);
 288                 break;
 289 #endif
 290         }
 291
 292         return retval;
 293 }
 294
 295 static struct file_operations coreb_fops = {
 296         .owner = THIS_MODULE,
 297         .llseek = coreb_lseek,
 298         .read = coreb_read,
 299         .write = coreb_write,
 300         .ioctl = coreb_ioctl,
 301         .open = coreb_open,
 302         .release = coreb_release
 303 };
 304
 305 static struct miscdevice coreb_dev = {
 306         COREB_MINOR,
 307         "coreb",
 308         &coreb_fops
 309 };
 310
 311 static ssize_t coreb_show_status(struct device *dev, struct device_attribute *attr, char *buf)
 312 {
 313         return sprintf(buf,
 314                        "Base Address:\t0x%08lx\n"
 315                        "Core B is %s\n"
 316                        "SICA_SYSCR:\t%04x\n"
 317                        "SICB_SYSCR:\t%04x\n"
 318                        "\n"
 319                        "IRQ Status:\tCore A\t\tCore B\n"
 320                        "ISR0:\t\t%08x\t\t%08x\n"
 321                        "ISR1:\t\t%08x\t\t%08x\n"
 322                        "IMASK0:\t\t%08x\t\t%08x\n"
 323                        "IMASK1:\t\t%08x\t\t%08x\n",
 324                        coreb_base,
 325                        coreb_status & COREB_IS_RUNNING ? "running" : "stalled",
 326                        bfin_read_SICA_SYSCR(), bfin_read_SICB_SYSCR(),
 327                        bfin_read_SICA_ISR0(), bfin_read_SICB_ISR0(),
 328                        bfin_read_SICA_ISR1(), bfin_read_SICB_ISR0(),
 329                        bfin_read_SICA_IMASK0(), bfin_read_SICB_IMASK0(),
 330                        bfin_read_SICA_IMASK1(), bfin_read_SICB_IMASK1());
 331 }
 332
 333 static DEVICE_ATTR(coreb_status, S_IRUGO, coreb_show_status, NULL);
 334
 335 int __init bf561_coreb_init(void)
 336 {
 337         init_waitqueue_head(&coreb_dma_wait);
 338
 339         spin_lock_init(&coreb_lock);
 340         /* Request the core memory regions for Core B */
 341         if (request_mem_region(0xff600000, 0x4000,
 342                                "Core B - Instruction SRAM") == NULL)
 343                 goto exit;
 344
 345         if (request_mem_region(0xFF610000, 0x4000,
 346                                "Core B - Instruction SRAM") == NULL)
 347                 goto release_instruction_a_sram;
 348
 349         if (request_mem_region(0xFF500000, 0x8000,
 350                                "Core B - Data Bank B SRAM") == NULL)
 351                 goto release_instruction_b_sram;
 352
 353         if (request_mem_region(0xff400000, 0x8000,
 354                                "Core B - Data Bank A SRAM") == NULL)
 355                 goto release_data_b_sram;
 356
 357         if (request_dma(CH_MEM_STREAM2_DEST, "Core B - DMA Destination") < 0)
 358                 goto release_data_a_sram;
 359
 360         if (request_dma(CH_MEM_STREAM2_SRC, "Core B - DMA Source") < 0)
 361                 goto release_dma_dest;
 362
 363         set_dma_callback(CH_MEM_STREAM2_DEST, coreb_dma_interrupt, NULL);
 364
 365         misc_register(&coreb_dev);
 366
 367         if (device_create_file(coreb_dev.this_device, &dev_attr_coreb_status))
 368                 goto release_dma_src;
 369
 370         printk(KERN_INFO "BF561 Core B driver %s initialized.\n", MODULE_VER);
 371         return 0;
 372
 373  release_dma_src:
 374         free_dma(CH_MEM_STREAM2_SRC);
 375  release_dma_dest:
 376         free_dma(CH_MEM_STREAM2_DEST);
 377  release_data_a_sram:
 378         release_mem_region(0xff400000, 0x8000);
 379  release_data_b_sram:
 380         release_mem_region(0xff500000, 0x8000);
 381  release_instruction_b_sram:
 382         release_mem_region(0xff610000, 0x4000);
 383  release_instruction_a_sram:
 384         release_mem_region(0xff600000, 0x4000);
 385  exit:
 386         return -ENOMEM;
 387 }
 388
 389 void __exit bf561_coreb_exit(void)
 390 {
 391         device_remove_file(coreb_dev.this_device, &dev_attr_coreb_status);
 392         misc_deregister(&coreb_dev);
 393
 394         release_mem_region(0xff610000, 0x4000);
 395         release_mem_region(0xff600000, 0x4000);
 396         release_mem_region(0xff500000, 0x8000);
 397         release_mem_region(0xff400000, 0x8000);
 398
 399         free_dma(CH_MEM_STREAM2_DEST);
 400         free_dma(CH_MEM_STREAM2_SRC);
 401 }
 402
 403 module_init(bf561_coreb_init);
 404 module_exit(bf561_coreb_exit);
 405
 406 MODULE_AUTHOR("Bas Vermeulen <bvermeul@blackstar.xs4all.nl>");
 407 MODULE_DESCRIPTION("BF561 Core B Support");