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
  31 #include <common.h>
  32 #include <syscall.h>
  33
  34 #define STANDALONE
  35
  36 #ifndef STANDALONE                      /* Linked into/Part of  PPCBoot */
  37 #include <command.h>
  38 #include <watchdog.h>
  39 #else                                   /* Standalone app of PPCBoot */
  40 #include <syscall.h>
  41 #define printf  mon_printf
  42 #define tstc    mon_tstc
  43 #define getc    mon_getc
  44 #define putc    mon_putc
  45 #define udelay  mon_udelay
  46 #define malloc  mon_malloc
  47 #define WATCHDOG_RESET() {                                              \
  48                         *(ushort *)(CFG_IMMR + 0x1000E) = 0x556c;       \
  49                         *(ushort *)(CFG_IMMR + 0x1000E) = 0xaa39;       \
  50                 }
  51 #endif  /* STANDALONE */
  52
  53 static int debug = 1;
  54
  55 #define DEBUG(fmt, args...)      {                                      \
  56         if(debug != 0) {                                                \
  57                 printf("[%s %d %s]: ",__FILE__,__LINE__,__FUNCTION__);  \
  58                 printf(fmt, ##args);                                    \
  59         }                                                               \
  60 }
  61
  62 #define CPM_CR_IDMA1_SBLOCK  (0x14)
  63 #define CPM_CR_IDMA2_SBLOCK  (0x15)
  64 #define CPM_CR_IDMA3_SBLOCK  (0x16)
  65 #define CPM_CR_IDMA4_SBLOCK  (0x17)
  66 #define CPM_CR_IDMA1_PAGE    (0x07)
  67 #define CPM_CR_IDMA2_PAGE    (0x08)
  68 #define CPM_CR_IDMA3_PAGE    (0x09)
  69 #define CPM_CR_IDMA4_PAGE    (0x0a)
  70 #define PROFF_IDMA1_BASE     ((uint)0x87fe)
  71 #define PROFF_IDMA2_BASE     ((uint)0x88fe)
  72 #define PROFF_IDMA3_BASE     ((uint)0x89fe)
  73 #define PROFF_IDMA4_BASE     ((uint)0x8afe)
  74
  75 #define CPM_CR_INIT_TRX     ((ushort)0x0000)
  76 #define CPM_CR_FLG  ((ushort)0x0001)
  77
  78 #define mk_cr_cmd(PG, SBC, MCN, OP) \
  79     ((PG << 26) | (SBC << 21) | (MCN << 6) | OP)
  80
  81
  82 #pragma pack(1)
  83 typedef struct ibdbits {
  84         unsigned b_valid:1;
  85         unsigned b_resv1:1;
  86         unsigned b_wrap:1;
  87         unsigned b_interrupt:1;
  88         unsigned b_last:1;
  89         unsigned b_resv2:1;
  90         unsigned b_cm:1;
  91         unsigned b_resv3:2;
  92         unsigned b_sdn:1;
  93         unsigned b_ddn:1;
  94         unsigned b_dgbl:1;
  95         unsigned b_dbo:2;
  96         unsigned b_resv4:1;
  97         unsigned b_ddtb:1;
  98         unsigned b_resv5:2;
  99         unsigned b_sgbl:1;
 100         unsigned b_sbo:2;
 101         unsigned b_resv6:1;
 102         unsigned b_sdtb:1;
 103         unsigned b_resv7:9;
 104 } ibdbits_t;
 105
 106 #pragma pack(1)
 107 typedef union ibdbitsu {
 108         ibdbits_t b;
 109         uint i;
 110 } ibdbitsu_t;
 111
 112 #pragma pack(1)
 113 typedef struct idma_buf_desc {
 114         ibdbitsu_t ibd_bits;            /* Status and Control */
 115         uint ibd_datlen;                /* Data length in buffer */
 116         uint ibd_sbuf;                  /* Source buffer addr in host mem */
 117         uint ibd_dbuf;                  /* Destination buffer addr in host mem */
 118 } ibd_t;
 119
 120
 121 #pragma pack(1)
 122 typedef struct dcmbits {
 123         unsigned b_fb:1;
 124         unsigned b_lp:1;
 125         unsigned b_resv1:3;
 126         unsigned b_tc2:1;
 127         unsigned b_resv2:1;
 128         unsigned b_wrap:3;
 129         unsigned b_sinc:1;
 130         unsigned b_dinc:1;
 131         unsigned b_erm:1;
 132         unsigned b_dt:1;
 133         unsigned b_sd:2;
 134 } dcmbits_t;
 135
 136 #pragma pack(1)
 137 typedef union dcmbitsu {
 138         dcmbits_t b;
 139         ushort i;
 140 } dcmbitsu_t;
 141
 142 #pragma pack(1)
 143 typedef struct pram_idma {
 144         ushort pi_ibase;
 145         dcmbitsu_t pi_dcmbits;
 146         ushort pi_ibdptr;
 147         ushort pi_dprbuf;
 148         ushort pi_bufinv;               /* internal to CPM */
 149         ushort pi_ssmax;
 150         ushort pi_dprinptr;             /* internal to CPM */
 151         ushort pi_sts;
 152         ushort pi_dproutptr;            /* internal to CPM */
 153         ushort pi_seob;
 154         ushort pi_deob;
 155         ushort pi_dts;
 156         ushort pi_retadd;
 157         ushort pi_resv1;                /* internal to CPM */
 158         uint pi_bdcnt;
 159         uint pi_sptr;
 160         uint pi_dptr;
 161         uint pi_istate;
 162 } pram_idma_t;
 163
 164
 165 volatile immap_t *immap = (immap_t *) CFG_IMMR;
 166 volatile ibd_t *bdf;
 167 volatile pram_idma_t *piptr;
 168
 169 volatile int dmadone;
 170 volatile int *dmadonep = &dmadone;
 171 void dmadone_handler (void *);
 172
 173 int idma_init (void);
 174 void idma_start (int, int, int, uint, uint, int);
 175 uint dpalloc (uint, uint);
 176
 177
 178 uint dpinit_done = 0;
 179
 180
 181 #ifdef STANDALONE
 182 int ctrlc (void)
 183 {
 184         if (mon_tstc()) {
 185                 switch (mon_getc ()) {
 186                 case 0x03:              /* ^C - Control C */
 187                         return 1;
 188                 default:
 189                         break;
 190                 }
 191         }
 192         return 0;
 193 }
 194 void * memset(void * s,int c,size_t count)
 195 {
 196         char *xs = (char *) s;
 197         while (count--)
 198                 *xs++ = c;
 199         return s;
 200 }
 201 int memcmp(const void * cs,const void * ct,size_t count)
 202 {
 203         const unsigned char *su1, *su2;
 204         int res = 0;
 205         for( su1 = cs, su2 = ct; 0 < count; ++su1, ++su2, count--)
 206                 if ((res = *su1 - *su2) != 0)
 207                         break;
 208         return res;
 209 }
 210 #endif  /* STANDALONE */
 211
 212 #ifdef STANDALONE
 213 int mem_to_mem_idma2intr (bd_t * bd, int argc, char *argv[])
 214 #else
 215 int do_idma (bd_t * bd, int argc, char *argv[])
 216 #endif  /* STANDALONE */
 217 {
 218         int i;
 219
 220         dpinit_done = 0;
 221
 222         idma_init ();
 223
 224         DEBUG ("Installing dma handler\n");
 225         mon_install_hdlr (7, dmadone_handler, (void *) bdf);
 226
 227         memset ((void *) 0x100000, 'a', 512);
 228         memset ((void *) 0x200000, 'b', 512);
 229
 230         for (i = 0; i < 32; i++) {
 231                 printf ("Startin IDMA, iteration=%d\n", i);
 232                 idma_start (1, 1, 512, 0x100000, 0x200000, 3);
 233         }
 234
 235         DEBUG ("Uninstalling dma handler\n");
 236         mon_free_hdlr (7);
 237
 238         return 0;
 239 }
 240
 241 void
 242 idma_start (int sinc, int dinc, int sz, uint sbuf, uint dbuf, int ttype)
 243 {
 244         /* ttype is for M-M, M-P, P-M or P-P: not used for now */
 245
 246         piptr->pi_istate = 0;   /* manual says: clear it before every START_IDMA */
 247         piptr->pi_dcmbits.b.b_resv1 = 0;
 248
 249         if (sinc == 1)
 250                 piptr->pi_dcmbits.b.b_sinc = 1;
 251         else
 252                 piptr->pi_dcmbits.b.b_sinc = 0;
 253
 254         if (dinc == 1)
 255                 piptr->pi_dcmbits.b.b_dinc = 1;
 256         else
 257                 piptr->pi_dcmbits.b.b_dinc = 0;
 258
 259         piptr->pi_dcmbits.b.b_erm = 0;
 260         piptr->pi_dcmbits.b.b_sd = 0x00;        /* M-M */
 261
 262         bdf->ibd_sbuf = sbuf;
 263         bdf->ibd_dbuf = dbuf;
 264         bdf->ibd_bits.b.b_cm = 0;
 265         bdf->ibd_bits.b.b_interrupt = 1;
 266         bdf->ibd_bits.b.b_wrap = 1;
 267         bdf->ibd_bits.b.b_last = 1;
 268         bdf->ibd_bits.b.b_sdn = 0;
 269         bdf->ibd_bits.b.b_ddn = 0;
 270         bdf->ibd_bits.b.b_dgbl = 0;
 271         bdf->ibd_bits.b.b_ddtb = 0;
 272         bdf->ibd_bits.b.b_sgbl = 0;
 273         bdf->ibd_bits.b.b_sdtb = 0;
 274         bdf->ibd_bits.b.b_dbo = 1;
 275         bdf->ibd_bits.b.b_sbo = 1;
 276         bdf->ibd_bits.b.b_valid = 1;
 277         bdf->ibd_datlen = 512;
 278
 279         *dmadonep = 0;
 280
 281         immap->im_sdma.sdma_idmr2 = (uchar) 0xf;
 282
 283         immap->im_cpm.cp_cpcr = mk_cr_cmd (CPM_CR_IDMA2_PAGE,
 284                                            CPM_CR_IDMA2_SBLOCK, 0x0,
 285                                            0x9) | 0x00010000;
 286
 287         while (*dmadonep != 1) {
 288                 if (ctrlc ()) {
 289                         DEBUG ("\nInterrupted waiting for DMA interrupt.\n");
 290                         goto done;
 291                 }
 292                 printf ("Waiting for DMA interrupt (dmadone=%d b_valid = %d)...\n",
 293                         dmadone, bdf->ibd_bits.b.b_valid);
 294                 udelay (1000000);
 295         }
 296         printf ("DMA complete notification received!\n");
 297
 298   done:
 299         DEBUG ("memcmp(0x%08x, 0x%08x, 512) = %d\n",
 300                 sbuf, dbuf, memcmp ((void *) sbuf, (void *) dbuf, 512));
 301
 302         return;
 303 }
 304
 305 #define MAX_INT_BUFSZ   64
 306 #define DCM_WRAP         0      /* MUST be consistant with MAX_INT_BUFSZ */
 307
 308 int idma_init (void)
 309 {
 310         uint memaddr;
 311
 312         immap->im_cpm.cp_rccr &= ~0x00F3FFFF;
 313         immap->im_cpm.cp_rccr |= 0x00A00A00;
 314
 315         memaddr = dpalloc (sizeof (pram_idma_t), 64);
 316
 317         *(volatile ushort *) &immap->im_dprambase[PROFF_IDMA2_BASE] = memaddr;
 318         piptr = (volatile pram_idma_t *) ((uint) (immap) + memaddr);
 319
 320         piptr->pi_resv1 = 0;            /* manual says: clear it */
 321         piptr->pi_dcmbits.b.b_fb = 0;
 322         piptr->pi_dcmbits.b.b_lp = 1;
 323         piptr->pi_dcmbits.b.b_erm = 0;
 324         piptr->pi_dcmbits.b.b_dt = 0;
 325
 326         memaddr = (uint) dpalloc (sizeof (ibd_t), 64);
 327         piptr->pi_ibase = piptr->pi_ibdptr = (volatile short) memaddr;
 328         bdf = (volatile ibd_t *) ((uint) (immap) + memaddr);
 329         bdf->ibd_bits.b.b_valid = 0;
 330
 331         memaddr = (uint) dpalloc (64, 64);
 332         piptr->pi_dprbuf = (volatile ushort) memaddr;
 333         piptr->pi_dcmbits.b.b_wrap = 4;
 334         piptr->pi_ssmax = 32;
 335
 336         piptr->pi_sts = piptr->pi_ssmax;
 337         piptr->pi_dts = piptr->pi_ssmax;
 338
 339         return 1;
 340 }
 341
 342 void dmadone_handler (void *arg)
 343 {
 344         immap->im_sdma.sdma_idmr2 = (uchar) 0x0;
 345
 346         *dmadonep = 1;
 347
 348         return;
 349 }
 350
 351
 352 static uint dpbase = 0;
 353
 354 uint dpalloc (uint size, uint align)
 355 {
 356         DECLARE_GLOBAL_DATA_PTR;
 357
 358         volatile immap_t *immr = (immap_t *) CFG_IMMR;
 359         uint retloc;
 360         uint align_mask, off;
 361         uint savebase;
 362
 363         /* Pointer to initial global data area */
 364
 365         if (dpinit_done == 0) {
 366                 dpbase = gd->dp_alloc_base;
 367                 dpinit_done = 1;
 368         }
 369
 370         align_mask = align - 1;
 371         savebase = dpbase;
 372
 373         if ((off = (dpbase & align_mask)) != 0)
 374                 dpbase += (align - off);
 375
 376         if ((off = size & align_mask) != 0)
 377                 size += align - off;
 378
 379         if ((dpbase + size) >= gd->dp_alloc_top) {
 380                 dpbase = savebase;
 381                 printf ("dpalloc: ran out of dual port ram!");
 382                 return 0;
 383         }
 384
 385         retloc = dpbase;
 386         dpbase += size;
 387
 388         memset ((void *) &immr->im_dprambase[retloc], 0, size);
 389
 390         return (retloc);
 391 }