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 == NO_IRQ)
  86                 goto error;
  87
  88         /* Init the BDs, if needed */
  89         if (bd_count) {
  90                 tsk->cookie = kmalloc(sizeof(void*) * bd_count, GFP_KERNEL);
  91                 if (!tsk->cookie)
  92                         goto error;
  93
  94                 tsk->bd = bcom_sram_alloc(bd_count * bd_size, 4, &tsk->bd_pa);
  95                 if (!tsk->bd)
  96                         goto error;
  97                 memset(tsk->bd, 0x00, bd_count * bd_size);
  98
  99                 tsk->num_bd = bd_count;
 100                 tsk->bd_size = bd_size;
 101         }
 102
 103         return tsk;
 104
 105 error:
 106         if (tsk) {
 107                 if (tsk->irq != NO_IRQ)
 108                         irq_dispose_mapping(tsk->irq);
 109                 bcom_sram_free(tsk->bd);
 110                 kfree(tsk->cookie);
 111                 kfree(tsk);
 112         }
 113
 114         bcom_eng->tdt[tasknum].stop = 0;
 115
 116         return NULL;
 117 }
 118 EXPORT_SYMBOL_GPL(bcom_task_alloc);
 119
 120 void
 121 bcom_task_free(struct bcom_task *tsk)
 122 {
 123         /* Stop the task */
 124         bcom_disable_task(tsk->tasknum);
 125
 126         /* Clear TDT */
 127         bcom_eng->tdt[tsk->tasknum].start = 0;
 128         bcom_eng->tdt[tsk->tasknum].stop  = 0;
 129
 130         /* Free everything */
 131         irq_dispose_mapping(tsk->irq);
 132         bcom_sram_free(tsk->bd);
 133         kfree(tsk->cookie);
 134         kfree(tsk);
 135 }
 136 EXPORT_SYMBOL_GPL(bcom_task_free);
 137
 138 int
 139 bcom_load_image(int task, u32 *task_image)
 140 {
 141         struct bcom_task_header *hdr = (struct bcom_task_header *)task_image;
 142         struct bcom_tdt *tdt;
 143         u32 *desc, *var, *inc;
 144         u32 *desc_src, *var_src, *inc_src;
 145
 146         /* Safety checks */
 147         if (hdr->magic != BCOM_TASK_MAGIC) {
 148                 printk(KERN_ERR DRIVER_NAME
 149                         ": Trying to load invalid microcode\n");
 150                 return -EINVAL;
 151         }
 152
 153         if ((task < 0) || (task >= BCOM_MAX_TASKS)) {
 154                 printk(KERN_ERR DRIVER_NAME
 155                         ": Trying to load invalid task %d\n", task);
 156                 return -EINVAL;
 157         }
 158
 159         /* Initial load or reload */
 160         tdt = &bcom_eng->tdt[task];
 161
 162         if (tdt->start) {
 163                 desc = bcom_task_desc(task);
 164                 if (hdr->desc_size != bcom_task_num_descs(task)) {
 165                         printk(KERN_ERR DRIVER_NAME
 166                                 ": Trying to reload wrong task image "
 167                                 "(%d size %d/%d)!\n",
 168                                 task,
 169                                 hdr->desc_size,
 170                                 bcom_task_num_descs(task));
 171                         return -EINVAL;
 172                 }
 173         } else {
 174                 phys_addr_t start_pa;
 175
 176                 desc = bcom_sram_alloc(hdr->desc_size * sizeof(u32), 4, &start_pa);
 177                 if (!desc)
 178                         return -ENOMEM;
 179
 180                 tdt->start = start_pa;
 181                 tdt->stop = start_pa + ((hdr->desc_size-1) * sizeof(u32));
 182         }
 183
 184         var = bcom_task_var(task);
 185         inc = bcom_task_inc(task);
 186
 187         /* Clear & copy */
 188         memset(var, 0x00, BCOM_VAR_SIZE);
 189         memset(inc, 0x00, BCOM_INC_SIZE);
 190
 191         desc_src = (u32 *)(hdr + 1);
 192         var_src = desc_src + hdr->desc_size;
 193         inc_src = var_src + hdr->var_size;
 194
 195         memcpy(desc, desc_src, hdr->desc_size * sizeof(u32));
 196         memcpy(var + hdr->first_var, var_src, hdr->var_size * sizeof(u32));
 197         memcpy(inc, inc_src, hdr->inc_size * sizeof(u32));
 198
 199         return 0;
 200 }
 201 EXPORT_SYMBOL_GPL(bcom_load_image);
 202
 203 void
 204 bcom_set_initiator(int task, int initiator)
 205 {
 206         int i;
 207         int num_descs;
 208         u32 *desc;
 209         int next_drd_has_initiator;
 210
 211         bcom_set_tcr_initiator(task, initiator);
 212
 213         /* Just setting tcr is apparently not enough due to some problem */
 214         /* with it. So we just go thru all the microcode and replace in  */
 215         /* the DRD directly */
 216
 217         desc = bcom_task_desc(task);
 218         next_drd_has_initiator = 1;
 219         num_descs = bcom_task_num_descs(task);
 220
 221         for (i=0; i<num_descs; i++, desc++) {
 222                 if (!bcom_desc_is_drd(*desc))
 223                         continue;
 224                 if (next_drd_has_initiator)
 225                         if (bcom_desc_initiator(*desc) != BCOM_INITIATOR_ALWAYS)
 226                                 bcom_set_desc_initiator(desc, initiator);
 227                 next_drd_has_initiator = !bcom_drd_is_extended(*desc);
 228         }
 229 }
 230 EXPORT_SYMBOL_GPL(bcom_set_initiator);
 231
 232
 233 /* Public API */
 234
 235 void
 236 bcom_enable(struct bcom_task *tsk)
 237 {
 238         bcom_enable_task(tsk->tasknum);
 239 }
 240 EXPORT_SYMBOL_GPL(bcom_enable);
 241
 242 void
 243 bcom_disable(struct bcom_task *tsk)
 244 {
 245         bcom_disable_task(tsk->tasknum);
 246 }
 247 EXPORT_SYMBOL_GPL(bcom_disable);
 248
 249
 250 /* ======================================================================== */
 251 /* Engine init/cleanup                                                      */
 252 /* ======================================================================== */
 253
 254 /* Function Descriptor table */
 255 /* this will need to be updated if Freescale changes their task code FDT */
 256 static u32 fdt_ops[] = {
 257         0xa0045670,     /* FDT[48] - load_acc()   */
 258         0x80045670,     /* FDT[49] - unload_acc() */
 259         0x21800000,     /* FDT[50] - and()        */
 260         0x21e00000,     /* FDT[51] - or()         */
 261         0x21500000,     /* FDT[52] - xor()        */
 262         0x21400000,     /* FDT[53] - andn()       */
 263         0x21500000,     /* FDT[54] - not()        */
 264         0x20400000,     /* FDT[55] - add()        */
 265         0x20500000,     /* FDT[56] - sub()        */
 266         0x20800000,     /* FDT[57] - lsh()        */
 267         0x20a00000,     /* FDT[58] - rsh()        */
 268         0xc0170000,     /* FDT[59] - crc8()       */
 269         0xc0145670,     /* FDT[60] - crc16()      */
 270         0xc0345670,     /* FDT[61] - crc32()      */
 271         0xa0076540,     /* FDT[62] - endian32()   */
 272         0xa0000760,     /* FDT[63] - endian16()   */
 273 };
 274
 275
 276 static int bcom_engine_init(void)
 277 {
 278         int task;
 279         phys_addr_t tdt_pa, ctx_pa, var_pa, fdt_pa;
 280         unsigned int tdt_size, ctx_size, var_size, fdt_size;
 281
 282         /* Allocate & clear SRAM zones for FDT, TDTs, contexts and vars/incs */
 283         tdt_size = BCOM_MAX_TASKS * sizeof(struct bcom_tdt);
 284         ctx_size = BCOM_MAX_TASKS * BCOM_CTX_SIZE;
 285         var_size = BCOM_MAX_TASKS * (BCOM_VAR_SIZE + BCOM_INC_SIZE);
 286         fdt_size = BCOM_FDT_SIZE;
 287
 288         bcom_eng->tdt = bcom_sram_alloc(tdt_size, sizeof(u32), &tdt_pa);
 289         bcom_eng->ctx = bcom_sram_alloc(ctx_size, BCOM_CTX_ALIGN, &ctx_pa);
 290         bcom_eng->var = bcom_sram_alloc(var_size, BCOM_VAR_ALIGN, &var_pa);
 291         bcom_eng->fdt = bcom_sram_alloc(fdt_size, BCOM_FDT_ALIGN, &fdt_pa);
 292
 293         if (!bcom_eng->tdt || !bcom_eng->ctx || !bcom_eng->var || !bcom_eng->fdt) {
 294                 printk(KERN_ERR "DMA: SRAM alloc failed in engine init !\n");
 295
 296                 bcom_sram_free(bcom_eng->tdt);
 297                 bcom_sram_free(bcom_eng->ctx);
 298                 bcom_sram_free(bcom_eng->var);
 299                 bcom_sram_free(bcom_eng->fdt);
 300
 301                 return -ENOMEM;
 302         }
 303
 304         memset(bcom_eng->tdt, 0x00, tdt_size);
 305         memset(bcom_eng->ctx, 0x00, ctx_size);
 306         memset(bcom_eng->var, 0x00, var_size);
 307         memset(bcom_eng->fdt, 0x00, fdt_size);
 308
 309         /* Copy the FDT for the EU#3 */
 310         memcpy(&bcom_eng->fdt[48], fdt_ops, sizeof(fdt_ops));
 311
 312         /* Initialize Task base structure */
 313         for (task=0; task<BCOM_MAX_TASKS; task++)
 314         {
 315                 out_be16(&bcom_eng->regs->tcr[task], 0);
 316                 out_8(&bcom_eng->regs->ipr[task], 0);
 317
 318                 bcom_eng->tdt[task].context     = ctx_pa;
 319                 bcom_eng->tdt[task].var = var_pa;
 320                 bcom_eng->tdt[task].fdt = fdt_pa;
 321
 322                 var_pa += BCOM_VAR_SIZE + BCOM_INC_SIZE;
 323                 ctx_pa += BCOM_CTX_SIZE;
 324         }
 325
 326         out_be32(&bcom_eng->regs->taskBar, tdt_pa);
 327
 328         /* Init 'always' initiator */
 329         out_8(&bcom_eng->regs->ipr[BCOM_INITIATOR_ALWAYS], BCOM_IPR_ALWAYS);
 330
 331         /* Disable COMM Bus Prefetch on the original 5200; it's broken */
 332         if ((mfspr(SPRN_SVR) & MPC5200_SVR_MASK) == MPC5200_SVR)
 333                 bcom_disable_prefetch();
 334
 335         /* Init lock */
 336         spin_lock_init(&bcom_eng->lock);
 337
 338         return 0;
 339 }
 340
 341 static void
 342 bcom_engine_cleanup(void)
 343 {
 344         int task;
 345
 346         /* Stop all tasks */
 347         for (task=0; task<BCOM_MAX_TASKS; task++)
 348         {
 349                 out_be16(&bcom_eng->regs->tcr[task], 0);
 350                 out_8(&bcom_eng->regs->ipr[task], 0);
 351         }
 352
 353         out_be32(&bcom_eng->regs->taskBar, 0ul);
 354
 355         /* Release the SRAM zones */
 356         bcom_sram_free(bcom_eng->tdt);
 357         bcom_sram_free(bcom_eng->ctx);
 358         bcom_sram_free(bcom_eng->var);
 359         bcom_sram_free(bcom_eng->fdt);
 360 }
 361
 362
 363 /* ======================================================================== */
 364 /* OF platform driver                                                       */
 365 /* ======================================================================== */
 366
 367 static int mpc52xx_bcom_probe(struct platform_device *op)
 368 {
 369         struct device_node *ofn_sram;
 370         struct resource res_bcom;
 371
 372         int rv;
 373
 374         /* Inform user we're ok so far */
 375         printk(KERN_INFO "DMA: MPC52xx BestComm driver\n");
 376
 377         /* Get the bestcomm node */
 378         of_node_get(op->dev.of_node);
 379
 380         /* Prepare SRAM */
 381         ofn_sram = of_find_matching_node(NULL, mpc52xx_sram_ids);
 382         if (!ofn_sram) {
 383                 printk(KERN_ERR DRIVER_NAME ": "
 384                         "No SRAM found in device tree\n");
 385                 rv = -ENODEV;
 386                 goto error_ofput;
 387         }
 388         rv = bcom_sram_init(ofn_sram, DRIVER_NAME);
 389         of_node_put(ofn_sram);
 390
 391         if (rv) {
 392                 printk(KERN_ERR DRIVER_NAME ": "
 393                         "Error in SRAM init\n");
 394                 goto error_ofput;
 395         }
 396
 397         /* Get a clean struct */
 398         bcom_eng = kzalloc(sizeof(struct bcom_engine), GFP_KERNEL);
 399         if (!bcom_eng) {
 400                 printk(KERN_ERR DRIVER_NAME ": "
 401                         "Can't allocate state structure\n");
 402                 rv = -ENOMEM;
 403                 goto error_sramclean;
 404         }
 405
 406         /* Save the node */
 407         bcom_eng->ofnode = op->dev.of_node;
 408
 409         /* Get, reserve & map io */
 410         if (of_address_to_resource(op->dev.of_node, 0, &res_bcom)) {
 411                 printk(KERN_ERR DRIVER_NAME ": "
 412                         "Can't get resource\n");
 413                 rv = -EINVAL;
 414                 goto error_sramclean;
 415         }
 416
 417         if (!request_mem_region(res_bcom.start, resource_size(&res_bcom),
 418                                 DRIVER_NAME)) {
 419                 printk(KERN_ERR DRIVER_NAME ": "
 420                         "Can't request registers region\n");
 421                 rv = -EBUSY;
 422                 goto error_sramclean;
 423         }
 424
 425         bcom_eng->regs_base = res_bcom.start;
 426         bcom_eng->regs = ioremap(res_bcom.start, sizeof(struct mpc52xx_sdma));
 427         if (!bcom_eng->regs) {
 428                 printk(KERN_ERR DRIVER_NAME ": "
 429                         "Can't map registers\n");
 430                 rv = -ENOMEM;
 431                 goto error_release;
 432         }
 433
 434         /* Now, do the real init */
 435         rv = bcom_engine_init();
 436         if (rv)
 437                 goto error_unmap;
 438
 439         /* Done ! */
 440         printk(KERN_INFO "DMA: MPC52xx BestComm engine @%08lx ok !\n",
 441                 (long)bcom_eng->regs_base);
 442
 443         return 0;
 444
 445         /* Error path */
 446 error_unmap:
 447         iounmap(bcom_eng->regs);
 448 error_release:
 449         release_mem_region(res_bcom.start, sizeof(struct mpc52xx_sdma));
 450 error_sramclean:
 451         kfree(bcom_eng);
 452         bcom_sram_cleanup();
 453 error_ofput:
 454         of_node_put(op->dev.of_node);
 455
 456         printk(KERN_ERR "DMA: MPC52xx BestComm init failed !\n");
 457
 458         return rv;
 459 }
 460
 461
 462 static int mpc52xx_bcom_remove(struct platform_device *op)
 463 {
 464         /* Clean up the engine */
 465         bcom_engine_cleanup();
 466
 467         /* Cleanup SRAM */
 468         bcom_sram_cleanup();
 469
 470         /* Release regs */
 471         iounmap(bcom_eng->regs);
 472         release_mem_region(bcom_eng->regs_base, sizeof(struct mpc52xx_sdma));
 473
 474         /* Release the node */
 475         of_node_put(bcom_eng->ofnode);
 476
 477         /* Release memory */
 478         kfree(bcom_eng);
 479         bcom_eng = NULL;
 480
 481         return 0;
 482 }
 483
 484 static const struct of_device_id mpc52xx_bcom_of_match[] = {
 485         { .compatible = "fsl,mpc5200-bestcomm", },
 486         { .compatible = "mpc5200-bestcomm", },
 487         {},
 488 };
 489
 490 MODULE_DEVICE_TABLE(of, mpc52xx_bcom_of_match);
 491
 492
 493 static struct platform_driver mpc52xx_bcom_of_platform_driver = {
 494         .probe          = mpc52xx_bcom_probe,
 495         .remove         = mpc52xx_bcom_remove,
 496         .driver = {
 497                 .name = DRIVER_NAME,
 498                 .of_match_table = mpc52xx_bcom_of_match,
 499         },
 500 };
 501
 502
 503 /* ======================================================================== */
 504 /* Module                                                                   */
 505 /* ======================================================================== */
 506
 507 static int __init
 508 mpc52xx_bcom_init(void)
 509 {
 510         return platform_driver_register(&mpc52xx_bcom_of_platform_driver);
 511 }
 512
 513 static void __exit
 514 mpc52xx_bcom_exit(void)
 515 {
 516         platform_driver_unregister(&mpc52xx_bcom_of_platform_driver);
 517 }
 518
 519 /* If we're not a module, we must make sure everything is setup before  */
 520 /* anyone tries to use us ... that's why we use subsys_initcall instead */
 521 /* of module_init. */
 522 subsys_initcall(mpc52xx_bcom_init);
 523 module_exit(mpc52xx_bcom_exit);
 524
 525 MODULE_DESCRIPTION("Freescale MPC52xx BestComm DMA");
 526 MODULE_AUTHOR("Sylvain Munaut <tnt@246tNt.com>");
 527 MODULE_AUTHOR("Andrey Volkov <avolkov@varma-el.com>");
 528 MODULE_AUTHOR("Dale Farnsworth <dfarnsworth@mvista.com>");
 529 MODULE_LICENSE("GPL v2");
 530