drivers/dma/bestcomm/bestcomm.c

   1 /*
   2  * Driver for MPC52xx processor BestComm peripheral controller
   3  *
   4  *
   5  * Copyright (C) 2006-2007 Sylvain Munaut <tnt@246tNt.com>
   6  * Copyright (C) 2005      Varma Electronics Oy,
   7  *                         ( by Andrey Volkov <avolkov@varma-el.com> )
   8  * Copyright (C) 2003-2004 MontaVista, Software, Inc.
   9  *                         ( by Dale Farnsworth <dfarnsworth@mvista.com> )
  10  *
  11  * This file is licensed under the terms of the GNU General Public License
  12  * version 2. This program is licensed "as is" without any warranty of any
  13  * kind, whether express or implied.
  14  */
  15
  16 #include <linux/module.h>
  17 #include <linux/kernel.h>
  18 #include <linux/slab.h>
  19 #include <linux/of.h>
  20 #include <linux/of_device.h>
  21 #include <linux/of_platform.h>
  22 #include <asm/io.h>
  23 #include <asm/irq.h>
  24 #include <asm/mpc52xx.h>
  25
  26 #include <linux/fsl/bestcomm/sram.h>
  27 #include <linux/fsl/bestcomm/bestcomm_priv.h>
  28 #include "linux/fsl/bestcomm/bestcomm.h"
  29
  30 #define DRIVER_NAME "bestcomm-core"
  31
  32 /* MPC5200 device tree match tables */
  33 static const struct of_device_id mpc52xx_sram_ids[] = {
  34         { .compatible = "fsl,mpc5200-sram", },
  35         { .compatible = "mpc5200-sram", },
  36         {}
  37 };
  38
  39
  40 struct bcom_engine *bcom_eng = NULL;
  41 EXPORT_SYMBOL_GPL(bcom_eng);    /* needed for inline functions */
  42
  43 /* ======================================================================== */
  44 /* Public and private API                                                   */
  45 /* ======================================================================== */
  46
  47 /* Private API */
  48
  49 struct bcom_task *
  50 bcom_task_alloc(int bd_count, int bd_size, int priv_size)
  51 {
  52         int i, tasknum = -1;
  53         struct bcom_task *tsk;
  54
  55         /* Don't try to do anything if bestcomm init failed */
  56         if (!bcom_eng)
  57                 return NULL;
  58
  59         /* Get and reserve a task num */
  60         spin_lock(&bcom_eng->lock);
  61
  62         for (i=0; i<BCOM_MAX_TASKS; i++)
  63                 if (!bcom_eng->tdt[i].stop) {   /* we use stop as a marker */
  64                         bcom_eng->tdt[i].stop = 0xfffffffful; /* dummy addr */
  65                         tasknum = i;
  66                         break;
  67                 }
  68
  69         spin_unlock(&bcom_eng->lock);
  70
  71         if (tasknum < 0)
  72                 return NULL;
  73
  74         /* Allocate our structure */
  75         tsk = kzalloc(sizeof(struct bcom_task) + priv_size, GFP_KERNEL);
  76         if (!tsk)
  77                 goto error;
  78
  79         tsk->tasknum = tasknum;
  80         if (priv_size)
  81                 tsk->priv = (void*)tsk + sizeof(struct bcom_task);
  82
  83         /* Get IRQ of that task */
  84         tsk->irq = irq_of_parse_and_map(bcom_eng->ofnode, tsk->tasknum);
  85         if (!tsk->irq)
  86                 goto error;
  87
  88         /* Init the BDs, if needed */
  89         if (bd_count) {
  90                 tsk->cookie = kmalloc_array(bd_count, sizeof(void *),
  91                                             GFP_KERNEL);
  92                 if (!tsk->cookie)
  93                         goto error;
  94
  95                 tsk->bd = bcom_sram_alloc(bd_count * bd_size, 4, &tsk->bd_pa);
  96                 if (!tsk->bd)
  97                         goto error;
  98                 memset(tsk->bd, 0x00, bd_count * bd_size);
  99
 100                 tsk->num_bd = bd_count;
 101                 tsk->bd_size = bd_size;
 102         }
 103
 104         return tsk;
 105
 106 error:
 107         if (tsk) {
 108                 if (tsk->irq)
 109                         irq_dispose_mapping(tsk->irq);
 110                 bcom_sram_free(tsk->bd);
 111                 kfree(tsk->cookie);
 112                 kfree(tsk);
 113         }
 114
 115         bcom_eng->tdt[tasknum].stop = 0;
 116
 117         return NULL;
 118 }
 119 EXPORT_SYMBOL_GPL(bcom_task_alloc);
 120
 121 void
 122 bcom_task_free(struct bcom_task *tsk)
 123 {
 124         /* Stop the task */
 125         bcom_disable_task(tsk->tasknum);
 126
 127         /* Clear TDT */
 128         bcom_eng->tdt[tsk->tasknum].start = 0;
 129         bcom_eng->tdt[tsk->tasknum].stop  = 0;
 130
 131         /* Free everything */
 132         irq_dispose_mapping(tsk->irq);
 133         bcom_sram_free(tsk->bd);
 134         kfree(tsk->cookie);
 135         kfree(tsk);
 136 }
 137 EXPORT_SYMBOL_GPL(bcom_task_free);
 138
 139 int
 140 bcom_load_image(int task, u32 *task_image)
 141 {
 142         struct bcom_task_header *hdr = (struct bcom_task_header *)task_image;
 143         struct bcom_tdt *tdt;
 144         u32 *desc, *var, *inc;
 145         u32 *desc_src, *var_src, *inc_src;
 146
 147         /* Safety checks */
 148         if (hdr->magic != BCOM_TASK_MAGIC) {
 149                 printk(KERN_ERR DRIVER_NAME
 150                         ": Trying to load invalid microcode\n");
 151                 return -EINVAL;
 152         }
 153
 154         if ((task < 0) || (task >= BCOM_MAX_TASKS)) {
 155                 printk(KERN_ERR DRIVER_NAME
 156                         ": Trying to load invalid task %d\n", task);
 157                 return -EINVAL;
 158         }
 159
 160         /* Initial load or reload */
 161         tdt = &bcom_eng->tdt[task];
 162
 163         if (tdt->start) {
 164                 desc = bcom_task_desc(task);
 165                 if (hdr->desc_size != bcom_task_num_descs(task)) {
 166                         printk(KERN_ERR DRIVER_NAME
 167                                 ": Trying to reload wrong task image "
 168                                 "(%d size %d/%d)!\n",
 169                                 task,
 170                                 hdr->desc_size,
 171                                 bcom_task_num_descs(task));
 172                         return -EINVAL;
 173                 }
 174         } else {
 175                 phys_addr_t start_pa;
 176
 177                 desc = bcom_sram_alloc(hdr->desc_size * sizeof(u32), 4, &start_pa);
 178                 if (!desc)
 179                         return -ENOMEM;
 180
 181                 tdt->start = start_pa;
 182                 tdt->stop = start_pa + ((hdr->desc_size-1) * sizeof(u32));
 183         }
 184
 185         var = bcom_task_var(task);
 186         inc = bcom_task_inc(task);
 187
 188         /* Clear & copy */
 189         memset(var, 0x00, BCOM_VAR_SIZE);
 190         memset(inc, 0x00, BCOM_INC_SIZE);
 191
 192         desc_src = (u32 *)(hdr + 1);
 193         var_src = desc_src + hdr->desc_size;
 194         inc_src = var_src + hdr->var_size;
 195
 196         memcpy(desc, desc_src, hdr->desc_size * sizeof(u32));
 197         memcpy(var + hdr->first_var, var_src, hdr->var_size * sizeof(u32));
 198         memcpy(inc, inc_src, hdr->inc_size * sizeof(u32));
 199
 200         return 0;
 201 }
 202 EXPORT_SYMBOL_GPL(bcom_load_image);
 203
 204 void
 205 bcom_set_initiator(int task, int initiator)
 206 {
 207         int i;
 208         int num_descs;
 209         u32 *desc;
 210         int next_drd_has_initiator;
 211
 212         bcom_set_tcr_initiator(task, initiator);
 213
 214         /* Just setting tcr is apparently not enough due to some problem */
 215         /* with it. So we just go thru all the microcode and replace in  */
 216         /* the DRD directly */
 217
 218         desc = bcom_task_desc(task);
 219         next_drd_has_initiator = 1;
 220         num_descs = bcom_task_num_descs(task);
 221
 222         for (i=0; i<num_descs; i++, desc++) {
 223                 if (!bcom_desc_is_drd(*desc))
 224                         continue;
 225                 if (next_drd_has_initiator)
 226                         if (bcom_desc_initiator(*desc) != BCOM_INITIATOR_ALWAYS)
 227                                 bcom_set_desc_initiator(desc, initiator);
 228                 next_drd_has_initiator = !bcom_drd_is_extended(*desc);
 229         }
 230 }
 231 EXPORT_SYMBOL_GPL(bcom_set_initiator);
 232
 233
 234 /* Public API */
 235
 236 void
 237 bcom_enable(struct bcom_task *tsk)
 238 {
 239         bcom_enable_task(tsk->tasknum);
 240 }
 241 EXPORT_SYMBOL_GPL(bcom_enable);
 242
 243 void
 244 bcom_disable(struct bcom_task *tsk)
 245 {
 246         bcom_disable_task(tsk->tasknum);
 247 }
 248 EXPORT_SYMBOL_GPL(bcom_disable);
 249
 250
 251 /* ======================================================================== */
 252 /* Engine init/cleanup                                                      */
 253 /* ======================================================================== */
 254
 255 /* Function Descriptor table */
 256 /* this will need to be updated if Freescale changes their task code FDT */
 257 static u32 fdt_ops[] = {
 258         0xa0045670,     /* FDT[48] - load_acc()   */
 259         0x80045670,     /* FDT[49] - unload_acc() */
 260         0x21800000,     /* FDT[50] - and()        */
 261         0x21e00000,     /* FDT[51] - or()         */
 262         0x21500000,     /* FDT[52] - xor()        */
 263         0x21400000,     /* FDT[53] - andn()       */
 264         0x21500000,     /* FDT[54] - not()        */
 265         0x20400000,     /* FDT[55] - add()        */
 266         0x20500000,     /* FDT[56] - sub()        */
 267         0x20800000,     /* FDT[57] - lsh()        */
 268         0x20a00000,     /* FDT[58] - rsh()        */
 269         0xc0170000,     /* FDT[59] - crc8()       */
 270         0xc0145670,     /* FDT[60] - crc16()      */
 271         0xc0345670,     /* FDT[61] - crc32()      */
 272         0xa0076540,     /* FDT[62] - endian32()   */
 273         0xa0000760,     /* FDT[63] - endian16()   */
 274 };
 275
 276
 277 static int bcom_engine_init(void)
 278 {
 279         int task;
 280         phys_addr_t tdt_pa, ctx_pa, var_pa, fdt_pa;
 281         unsigned int tdt_size, ctx_size, var_size, fdt_size;
 282
 283         /* Allocate & clear SRAM zones for FDT, TDTs, contexts and vars/incs */
 284         tdt_size = BCOM_MAX_TASKS * sizeof(struct bcom_tdt);
 285         ctx_size = BCOM_MAX_TASKS * BCOM_CTX_SIZE;
 286         var_size = BCOM_MAX_TASKS * (BCOM_VAR_SIZE + BCOM_INC_SIZE);
 287         fdt_size = BCOM_FDT_SIZE;
 288
 289         bcom_eng->tdt = bcom_sram_alloc(tdt_size, sizeof(u32), &tdt_pa);
 290         bcom_eng->ctx = bcom_sram_alloc(ctx_size, BCOM_CTX_ALIGN, &ctx_pa);
 291         bcom_eng->var = bcom_sram_alloc(var_size, BCOM_VAR_ALIGN, &var_pa);
 292         bcom_eng->fdt = bcom_sram_alloc(fdt_size, BCOM_FDT_ALIGN, &fdt_pa);
 293
 294         if (!bcom_eng->tdt || !bcom_eng->ctx || !bcom_eng->var || !bcom_eng->fdt) {
 295                 printk(KERN_ERR "DMA: SRAM alloc failed in engine init !\n");
 296
 297                 bcom_sram_free(bcom_eng->tdt);
 298                 bcom_sram_free(bcom_eng->ctx);
 299                 bcom_sram_free(bcom_eng->var);
 300                 bcom_sram_free(bcom_eng->fdt);
 301
 302                 return -ENOMEM;
 303         }
 304
 305         memset(bcom_eng->tdt, 0x00, tdt_size);
 306         memset(bcom_eng->ctx, 0x00, ctx_size);
 307         memset(bcom_eng->var, 0x00, var_size);
 308         memset(bcom_eng->fdt, 0x00, fdt_size);
 309
 310         /* Copy the FDT for the EU#3 */
 311         memcpy(&bcom_eng->fdt[48], fdt_ops, sizeof(fdt_ops));
 312
 313         /* Initialize Task base structure */
 314         for (task=0; task<BCOM_MAX_TASKS; task++)
 315         {
 316                 out_be16(&bcom_eng->regs->tcr[task], 0);
 317                 out_8(&bcom_eng->regs->ipr[task], 0);
 318
 319                 bcom_eng->tdt[task].context     = ctx_pa;
 320                 bcom_eng->tdt[task].var = var_pa;
 321                 bcom_eng->tdt[task].fdt = fdt_pa;
 322
 323                 var_pa += BCOM_VAR_SIZE + BCOM_INC_SIZE;
 324                 ctx_pa += BCOM_CTX_SIZE;
 325         }
 326
 327         out_be32(&bcom_eng->regs->taskBar, tdt_pa);
 328
 329         /* Init 'always' initiator */
 330         out_8(&bcom_eng->regs->ipr[BCOM_INITIATOR_ALWAYS], BCOM_IPR_ALWAYS);
 331
 332         /* Disable COMM Bus Prefetch on the original 5200; it's broken */
 333         if ((mfspr(SPRN_SVR) & MPC5200_SVR_MASK) == MPC5200_SVR)
 334                 bcom_disable_prefetch();
 335
 336         /* Init lock */
 337         spin_lock_init(&bcom_eng->lock);
 338
 339         return 0;
 340 }
 341
 342 static void
 343 bcom_engine_cleanup(void)
 344 {
 345         int task;
 346
 347         /* Stop all tasks */
 348         for (task=0; task<BCOM_MAX_TASKS; task++)
 349         {
 350                 out_be16(&bcom_eng->regs->tcr[task], 0);
 351                 out_8(&bcom_eng->regs->ipr[task], 0);
 352         }
 353
 354         out_be32(&bcom_eng->regs->taskBar, 0ul);
 355
 356         /* Release the SRAM zones */
 357         bcom_sram_free(bcom_eng->tdt);
 358         bcom_sram_free(bcom_eng->ctx);
 359         bcom_sram_free(bcom_eng->var);
 360         bcom_sram_free(bcom_eng->fdt);
 361 }
 362
 363
 364 /* ======================================================================== */
 365 /* OF platform driver                                                       */
 366 /* ======================================================================== */
 367
 368 static int mpc52xx_bcom_probe(struct platform_device *op)
 369 {
 370         struct device_node *ofn_sram;
 371         struct resource res_bcom;
 372
 373         int rv;
 374
 375         /* Inform user we're ok so far */
 376         printk(KERN_INFO "DMA: MPC52xx BestComm driver\n");
 377
 378         /* Get the bestcomm node */
 379         of_node_get(op->dev.of_node);
 380
 381         /* Prepare SRAM */
 382         ofn_sram = of_find_matching_node(NULL, mpc52xx_sram_ids);
 383         if (!ofn_sram) {
 384                 printk(KERN_ERR DRIVER_NAME ": "
 385                         "No SRAM found in device tree\n");
 386                 rv = -ENODEV;
 387                 goto error_ofput;
 388         }
 389         rv = bcom_sram_init(ofn_sram, DRIVER_NAME);
 390         of_node_put(ofn_sram);
 391
 392         if (rv) {
 393                 printk(KERN_ERR DRIVER_NAME ": "
 394                         "Error in SRAM init\n");
 395                 goto error_ofput;
 396         }
 397
 398         /* Get a clean struct */
 399         bcom_eng = kzalloc(sizeof(struct bcom_engine), GFP_KERNEL);
 400         if (!bcom_eng) {
 401                 rv = -ENOMEM;
 402                 goto error_sramclean;
 403         }
 404
 405         /* Save the node */
 406         bcom_eng->ofnode = op->dev.of_node;
 407
 408         /* Get, reserve & map io */
 409         if (of_address_to_resource(op->dev.of_node, 0, &res_bcom)) {
 410                 printk(KERN_ERR DRIVER_NAME ": "
 411                         "Can't get resource\n");
 412                 rv = -EINVAL;
 413                 goto error_sramclean;
 414         }
 415
 416         if (!request_mem_region(res_bcom.start, resource_size(&res_bcom),
 417                                 DRIVER_NAME)) {
 418                 printk(KERN_ERR DRIVER_NAME ": "
 419                         "Can't request registers region\n");
 420                 rv = -EBUSY;
 421                 goto error_sramclean;
 422         }
 423
 424         bcom_eng->regs_base = res_bcom.start;
 425         bcom_eng->regs = ioremap(res_bcom.start, sizeof(struct mpc52xx_sdma));
 426         if (!bcom_eng->regs) {
 427                 printk(KERN_ERR DRIVER_NAME ": "
 428                         "Can't map registers\n");
 429                 rv = -ENOMEM;
 430                 goto error_release;
 431         }
 432
 433         /* Now, do the real init */
 434         rv = bcom_engine_init();
 435         if (rv)
 436                 goto error_unmap;
 437
 438         /* Done ! */
 439         printk(KERN_INFO "DMA: MPC52xx BestComm engine @%08lx ok !\n",
 440                 (long)bcom_eng->regs_base);
 441
 442         return 0;
 443
 444         /* Error path */
 445 error_unmap:
 446         iounmap(bcom_eng->regs);
 447 error_release:
 448         release_mem_region(res_bcom.start, sizeof(struct mpc52xx_sdma));
 449 error_sramclean:
 450         kfree(bcom_eng);
 451         bcom_sram_cleanup();
 452 error_ofput:
 453         of_node_put(op->dev.of_node);
 454
 455         printk(KERN_ERR "DMA: MPC52xx BestComm init failed !\n");
 456
 457         return rv;
 458 }
 459
 460
 461 static int mpc52xx_bcom_remove(struct platform_device *op)
 462 {
 463         /* Clean up the engine */
 464         bcom_engine_cleanup();
 465
 466         /* Cleanup SRAM */
 467         bcom_sram_cleanup();
 468
 469         /* Release regs */
 470         iounmap(bcom_eng->regs);
 471         release_mem_region(bcom_eng->regs_base, sizeof(struct mpc52xx_sdma));
 472
 473         /* Release the node */
 474         of_node_put(bcom_eng->ofnode);
 475
 476         /* Release memory */
 477         kfree(bcom_eng);
 478         bcom_eng = NULL;
 479
 480         return 0;
 481 }
 482
 483 static const struct of_device_id mpc52xx_bcom_of_match[] = {
 484         { .compatible = "fsl,mpc5200-bestcomm", },
 485         { .compatible = "mpc5200-bestcomm", },
 486         {},
 487 };
 488
 489 MODULE_DEVICE_TABLE(of, mpc52xx_bcom_of_match);
 490
 491
 492 static struct platform_driver mpc52xx_bcom_of_platform_driver = {
 493         .probe          = mpc52xx_bcom_probe,
 494         .remove         = mpc52xx_bcom_remove,
 495         .driver = {
 496                 .name = DRIVER_NAME,
 497                 .of_match_table = mpc52xx_bcom_of_match,
 498         },
 499 };
 500
 501
 502 /* ======================================================================== */
 503 /* Module                                                                   */
 504 /* ======================================================================== */
 505
 506 static int __init
 507 mpc52xx_bcom_init(void)
 508 {
 509         return platform_driver_register(&mpc52xx_bcom_of_platform_driver);
 510 }
 511
 512 static void __exit
 513 mpc52xx_bcom_exit(void)
 514 {
 515         platform_driver_unregister(&mpc52xx_bcom_of_platform_driver);
 516 }
 517
 518 /* If we're not a module, we must make sure everything is setup before  */
 519 /* anyone tries to use us ... that's why we use subsys_initcall instead */
 520 /* of module_init. */
 521 subsys_initcall(mpc52xx_bcom_init);
 522 module_exit(mpc52xx_bcom_exit);
 523
 524 MODULE_DESCRIPTION("Freescale MPC52xx BestComm DMA");
 525 MODULE_AUTHOR("Sylvain Munaut <tnt@246tNt.com>");
 526 MODULE_AUTHOR("Andrey Volkov <avolkov@varma-el.com>");
 527 MODULE_AUTHOR("Dale Farnsworth <dfarnsworth@mvista.com>");
 528 MODULE_LICENSE("GPL v2");
 529