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