examples/mem_to_mem_idma2intr.c

   1 /* The dpalloc function used and implemented in this file was derieved
   2  * from PPCBoot/U-Boot file "cpu/mpc8260/commproc.c".
   3  */
   4
   5 /* Author: Arun Dharankar <ADharankar@ATTBI.Com>
   6  * This example is meant to only demonstrate how the IDMA could be used.
   7  */
   8
   9 /*
  10  * This file is based on "arch/ppc/8260_io/commproc.c" - here is it's
  11  * copyright notice:
  12  *
  13  * General Purpose functions for the global management of the
  14  * 8260 Communication Processor Module.
  15  * Copyright (c) 1999 Dan Malek (dmalek@jlc.net)
  16  * Copyright (c) 2000 MontaVista Software, Inc (source@mvista.com)
  17  *  2.3.99 Updates
  18  *
  19  * In addition to the individual control of the communication
  20  * channels, there are a few functions that globally affect the
  21  * communication processor.
  22  *
  23  * Buffer descriptors must be allocated from the dual ported memory
  24  * space.  The allocator for that is here.  When the communication
  25  * process is reset, we reclaim the memory available.  There is
  26  * currently no deallocator for this memory.
  27  */
  28
  29
  30 #include <common.h>
  31 #include <exports.h>
  32
  33 #define STANDALONE
  34
  35 #ifndef STANDALONE                      /* Linked into/Part of  PPCBoot */
  36 #include <command.h>
  37 #include <watchdog.h>
  38 #else                                   /* Standalone app of PPCBoot */
  39 #define WATCHDOG_RESET() {                                              \
  40                         *(ushort *)(CFG_IMMR + 0x1000E) = 0x556c;       \
  41                         *(ushort *)(CFG_IMMR + 0x1000E) = 0xaa39;       \
  42                 }
  43 #endif  /* STANDALONE */
  44
  45 static int debug = 1;
  46
  47 #define DEBUG(fmt, args...)      {                                      \
  48         if(debug != 0) {                                                \
  49                 printf("[%s %d %s]: ",__FILE__,__LINE__,__FUNCTION__);  \
  50                 printf(fmt, ##args);                                    \
  51         }                                                               \
  52 }
  53
  54 #define CPM_CR_IDMA1_SBLOCK  (0x14)
  55 #define CPM_CR_IDMA2_SBLOCK  (0x15)
  56 #define CPM_CR_IDMA3_SBLOCK  (0x16)
  57 #define CPM_CR_IDMA4_SBLOCK  (0x17)
  58 #define CPM_CR_IDMA1_PAGE    (0x07)
  59 #define CPM_CR_IDMA2_PAGE    (0x08)
  60 #define CPM_CR_IDMA3_PAGE    (0x09)
  61 #define CPM_CR_IDMA4_PAGE    (0x0a)
  62 #define PROFF_IDMA1_BASE     ((uint)0x87fe)
  63 #define PROFF_IDMA2_BASE     ((uint)0x88fe)
  64 #define PROFF_IDMA3_BASE     ((uint)0x89fe)
  65 #define PROFF_IDMA4_BASE     ((uint)0x8afe)
  66
  67 #define CPM_CR_INIT_TRX     ((ushort)0x0000)
  68 #define CPM_CR_FLG  ((ushort)0x0001)
  69
  70 #define mk_cr_cmd(PG, SBC, MCN, OP) \
  71     ((PG << 26) | (SBC << 21) | (MCN << 6) | OP)
  72
  73
  74 #pragma pack(1)
  75 typedef struct ibdbits {
  76         unsigned b_valid:1;
  77         unsigned b_resv1:1;
  78         unsigned b_wrap:1;
  79         unsigned b_interrupt:1;
  80         unsigned b_last:1;
  81         unsigned b_resv2:1;
  82         unsigned b_cm:1;
  83         unsigned b_resv3:2;
  84         unsigned b_sdn:1;
  85         unsigned b_ddn:1;
  86         unsigned b_dgbl:1;
  87         unsigned b_dbo:2;
  88         unsigned b_resv4:1;
  89         unsigned b_ddtb:1;
  90         unsigned b_resv5:2;
  91         unsigned b_sgbl:1;
  92         unsigned b_sbo:2;
  93         unsigned b_resv6:1;
  94         unsigned b_sdtb:1;
  95         unsigned b_resv7:9;
  96 } ibdbits_t;
  97
  98 #pragma pack(1)
  99 typedef union ibdbitsu {
 100         ibdbits_t b;
 101         uint i;
 102 } ibdbitsu_t;
 103
 104 #pragma pack(1)
 105 typedef struct idma_buf_desc {
 106         ibdbitsu_t ibd_bits;            /* Status and Control */
 107         uint ibd_datlen;                /* Data length in buffer */
 108         uint ibd_sbuf;                  /* Source buffer addr in host mem */
 109         uint ibd_dbuf;                  /* Destination buffer addr in host mem */
 110 } ibd_t;
 111
 112
 113 #pragma pack(1)
 114 typedef struct dcmbits {
 115         unsigned b_fb:1;
 116         unsigned b_lp:1;
 117         unsigned b_resv1:3;
 118         unsigned b_tc2:1;
 119         unsigned b_resv2:1;
 120         unsigned b_wrap:3;
 121         unsigned b_sinc:1;
 122         unsigned b_dinc:1;
 123         unsigned b_erm:1;
 124         unsigned b_dt:1;
 125         unsigned b_sd:2;
 126 } dcmbits_t;
 127
 128 #pragma pack(1)
 129 typedef union dcmbitsu {
 130         dcmbits_t b;
 131         ushort i;
 132 } dcmbitsu_t;
 133
 134 #pragma pack(1)
 135 typedef struct pram_idma {
 136         ushort pi_ibase;
 137         dcmbitsu_t pi_dcmbits;
 138         ushort pi_ibdptr;
 139         ushort pi_dprbuf;
 140         ushort pi_bufinv;               /* internal to CPM */
 141         ushort pi_ssmax;
 142         ushort pi_dprinptr;             /* internal to CPM */
 143         ushort pi_sts;
 144         ushort pi_dproutptr;            /* internal to CPM */
 145         ushort pi_seob;
 146         ushort pi_deob;
 147         ushort pi_dts;
 148         ushort pi_retadd;
 149         ushort pi_resv1;                /* internal to CPM */
 150         uint pi_bdcnt;
 151         uint pi_sptr;
 152         uint pi_dptr;
 153         uint pi_istate;
 154 } pram_idma_t;
 155
 156
 157 volatile immap_t *immap = (immap_t *) CFG_IMMR;
 158 volatile ibd_t *bdf;
 159 volatile pram_idma_t *piptr;
 160
 161 volatile int dmadone;
 162 volatile int *dmadonep = &dmadone;
 163 void dmadone_handler (void *);
 164
 165 int idma_init (void);
 166 void idma_start (int, int, int, uint, uint, int);
 167 uint dpalloc (uint, uint);
 168
 169
 170 uint dpinit_done = 0;
 171
 172
 173 #ifdef STANDALONE
 174 int ctrlc (void)
 175 {
 176         if (tstc()) {
 177                 switch (getc ()) {
 178                 case 0x03:              /* ^C - Control C */
 179                         return 1;
 180                 default:
 181                         break;
 182                 }
 183         }
 184         return 0;
 185 }
 186 void * memset(void * s,int c,size_t count)
 187 {
 188         char *xs = (char *) s;
 189         while (count--)
 190                 *xs++ = c;
 191         return s;
 192 }
 193 int memcmp(const void * cs,const void * ct,size_t count)
 194 {
 195         const unsigned char *su1, *su2;
 196         int res = 0;
 197         for( su1 = cs, su2 = ct; 0 < count; ++su1, ++su2, count--)
 198                 if ((res = *su1 - *su2) != 0)
 199                         break;
 200         return res;
 201 }
 202 #endif  /* STANDALONE */
 203
 204 #ifdef STANDALONE
 205 int mem_to_mem_idma2intr (int argc, char *argv[])
 206 #else
 207 int do_idma (bd_t * bd, int argc, char *argv[])
 208 #endif  /* STANDALONE */
 209 {
 210         int i;
 211
 212         app_startup(argv);
 213         dpinit_done = 0;
 214
 215         idma_init ();
 216
 217         DEBUG ("Installing dma handler\n");
 218         install_hdlr (7, dmadone_handler, (void *) bdf);
 219
 220         memset ((void *) 0x100000, 'a', 512);
 221         memset ((void *) 0x200000, 'b', 512);
 222
 223         for (i = 0; i < 32; i++) {
 224                 printf ("Startin IDMA, iteration=%d\n", i);
 225                 idma_start (1, 1, 512, 0x100000, 0x200000, 3);
 226         }
 227
 228         DEBUG ("Uninstalling dma handler\n");
 229         free_hdlr (7);
 230
 231         return 0;
 232 }
 233
 234 void
 235 idma_start (int sinc, int dinc, int sz, uint sbuf, uint dbuf, int ttype)
 236 {
 237         /* ttype is for M-M, M-P, P-M or P-P: not used for now */
 238
 239         piptr->pi_istate = 0;   /* manual says: clear it before every START_IDMA */
 240         piptr->pi_dcmbits.b.b_resv1 = 0;
 241
 242         if (sinc == 1)
 243                 piptr->pi_dcmbits.b.b_sinc = 1;
 244         else
 245                 piptr->pi_dcmbits.b.b_sinc = 0;
 246
 247         if (dinc == 1)
 248                 piptr->pi_dcmbits.b.b_dinc = 1;
 249         else
 250                 piptr->pi_dcmbits.b.b_dinc = 0;
 251
 252         piptr->pi_dcmbits.b.b_erm = 0;
 253         piptr->pi_dcmbits.b.b_sd = 0x00;        /* M-M */
 254
 255         bdf->ibd_sbuf = sbuf;
 256         bdf->ibd_dbuf = dbuf;
 257         bdf->ibd_bits.b.b_cm = 0;
 258         bdf->ibd_bits.b.b_interrupt = 1;
 259         bdf->ibd_bits.b.b_wrap = 1;
 260         bdf->ibd_bits.b.b_last = 1;
 261         bdf->ibd_bits.b.b_sdn = 0;
 262         bdf->ibd_bits.b.b_ddn = 0;
 263         bdf->ibd_bits.b.b_dgbl = 0;
 264         bdf->ibd_bits.b.b_ddtb = 0;
 265         bdf->ibd_bits.b.b_sgbl = 0;
 266         bdf->ibd_bits.b.b_sdtb = 0;
 267         bdf->ibd_bits.b.b_dbo = 1;
 268         bdf->ibd_bits.b.b_sbo = 1;
 269         bdf->ibd_bits.b.b_valid = 1;
 270         bdf->ibd_datlen = 512;
 271
 272         *dmadonep = 0;
 273
 274         immap->im_sdma.sdma_idmr2 = (uchar) 0xf;
 275
 276         immap->im_cpm.cp_cpcr = mk_cr_cmd (CPM_CR_IDMA2_PAGE,
 277                                            CPM_CR_IDMA2_SBLOCK, 0x0,
 278                                            0x9) | 0x00010000;
 279
 280         while (*dmadonep != 1) {
 281                 if (ctrlc ()) {
 282                         DEBUG ("\nInterrupted waiting for DMA interrupt.\n");
 283                         goto done;
 284                 }
 285                 printf ("Waiting for DMA interrupt (dmadone=%d b_valid = %d)...\n",
 286                         dmadone, bdf->ibd_bits.b.b_valid);
 287                 udelay (1000000);
 288         }
 289         printf ("DMA complete notification received!\n");
 290
 291   done:
 292         DEBUG ("memcmp(0x%08x, 0x%08x, 512) = %d\n",
 293                 sbuf, dbuf, memcmp ((void *) sbuf, (void *) dbuf, 512));
 294
 295         return;
 296 }
 297
 298 #define MAX_INT_BUFSZ   64
 299 #define DCM_WRAP         0      /* MUST be consistant with MAX_INT_BUFSZ */
 300
 301 int idma_init (void)
 302 {
 303         uint memaddr;
 304
 305         immap->im_cpm.cp_rccr &= ~0x00F3FFFF;
 306         immap->im_cpm.cp_rccr |= 0x00A00A00;
 307
 308         memaddr = dpalloc (sizeof (pram_idma_t), 64);
 309
 310         *(volatile ushort *) &immap->im_dprambase[PROFF_IDMA2_BASE] = memaddr;
 311         piptr = (volatile pram_idma_t *) ((uint) (immap) + memaddr);
 312
 313         piptr->pi_resv1 = 0;            /* manual says: clear it */
 314         piptr->pi_dcmbits.b.b_fb = 0;
 315         piptr->pi_dcmbits.b.b_lp = 1;
 316         piptr->pi_dcmbits.b.b_erm = 0;
 317         piptr->pi_dcmbits.b.b_dt = 0;
 318
 319         memaddr = (uint) dpalloc (sizeof (ibd_t), 64);
 320         piptr->pi_ibase = piptr->pi_ibdptr = (volatile short) memaddr;
 321         bdf = (volatile ibd_t *) ((uint) (immap) + memaddr);
 322         bdf->ibd_bits.b.b_valid = 0;
 323
 324         memaddr = (uint) dpalloc (64, 64);
 325         piptr->pi_dprbuf = (volatile ushort) memaddr;
 326         piptr->pi_dcmbits.b.b_wrap = 4;
 327         piptr->pi_ssmax = 32;
 328
 329         piptr->pi_sts = piptr->pi_ssmax;
 330         piptr->pi_dts = piptr->pi_ssmax;
 331
 332         return 1;
 333 }
 334
 335 void dmadone_handler (void *arg)
 336 {
 337         immap->im_sdma.sdma_idmr2 = (uchar) 0x0;
 338
 339         *dmadonep = 1;
 340
 341         return;
 342 }
 343
 344
 345 static uint dpbase = 0;
 346
 347 uint dpalloc (uint size, uint align)
 348 {
 349         DECLARE_GLOBAL_DATA_PTR;
 350
 351         volatile immap_t *immr = (immap_t *) CFG_IMMR;
 352         uint retloc;
 353         uint align_mask, off;
 354         uint savebase;
 355
 356         /* Pointer to initial global data area */
 357
 358         if (dpinit_done == 0) {
 359                 dpbase = gd->dp_alloc_base;
 360                 dpinit_done = 1;
 361         }
 362
 363         align_mask = align - 1;
 364         savebase = dpbase;
 365
 366         if ((off = (dpbase & align_mask)) != 0)
 367                 dpbase += (align - off);
 368
 369         if ((off = size & align_mask) != 0)
 370                 size += align - off;
 371
 372         if ((dpbase + size) >= gd->dp_alloc_top) {
 373                 dpbase = savebase;
 374                 printf ("dpalloc: ran out of dual port ram!");
 375                 return 0;
 376         }
 377
 378         retloc = dpbase;
 379         dpbase += size;
 380
 381         memset ((void *) &immr->im_dprambase[retloc], 0, size);
 382
 383         return (retloc);
 384 }