examples/standalone/mem_to_mem_idma2intr.c

   1 /* The dpalloc function used and implemented in this file was derieved
   2  * from PPCBoot/U-Boot file "arch/powerpc/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/powerpc/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 <console.h>
  32 #include <exports.h>
  33
  34 DECLARE_GLOBAL_DATA_PTR;
  35
  36 #define STANDALONE
  37
  38 #ifndef STANDALONE                      /* Linked into/Part of  PPCBoot */
  39 #include <command.h>
  40 #include <watchdog.h>
  41 #else                                   /* Standalone app of PPCBoot */
  42 #define WATCHDOG_RESET() {                                              \
  43                         *(ushort *)(CONFIG_SYS_IMMR + 0x1000E) = 0x556c;        \
  44                         *(ushort *)(CONFIG_SYS_IMMR + 0x1000E) = 0xaa39;        \
  45                 }
  46 #endif  /* STANDALONE */
  47
  48 static int debug = 1;
  49
  50 #define DEBUG(fmt, args...)      {                                      \
  51         if(debug != 0) {                                                \
  52                 printf("[%s %d %s]: ",__FILE__,__LINE__,__FUNCTION__);  \
  53                 printf(fmt, ##args);                                    \
  54         }                                                               \
  55 }
  56
  57 #define CPM_CR_IDMA1_SBLOCK  (0x14)
  58 #define CPM_CR_IDMA2_SBLOCK  (0x15)
  59 #define CPM_CR_IDMA3_SBLOCK  (0x16)
  60 #define CPM_CR_IDMA4_SBLOCK  (0x17)
  61 #define CPM_CR_IDMA1_PAGE    (0x07)
  62 #define CPM_CR_IDMA2_PAGE    (0x08)
  63 #define CPM_CR_IDMA3_PAGE    (0x09)
  64 #define CPM_CR_IDMA4_PAGE    (0x0a)
  65 #define PROFF_IDMA1_BASE     ((uint)0x87fe)
  66 #define PROFF_IDMA2_BASE     ((uint)0x88fe)
  67 #define PROFF_IDMA3_BASE     ((uint)0x89fe)
  68 #define PROFF_IDMA4_BASE     ((uint)0x8afe)
  69
  70 #define CPM_CR_INIT_TRX     ((ushort)0x0000)
  71 #define CPM_CR_FLG  ((ushort)0x0001)
  72
  73 #define mk_cr_cmd(PG, SBC, MCN, OP) \
  74     ((PG << 26) | (SBC << 21) | (MCN << 6) | OP)
  75
  76
  77 #pragma pack(1)
  78 typedef struct ibdbits {
  79         unsigned b_valid:1;
  80         unsigned b_resv1:1;
  81         unsigned b_wrap:1;
  82         unsigned b_interrupt:1;
  83         unsigned b_last:1;
  84         unsigned b_resv2:1;
  85         unsigned b_cm:1;
  86         unsigned b_resv3:2;
  87         unsigned b_sdn:1;
  88         unsigned b_ddn:1;
  89         unsigned b_dgbl:1;
  90         unsigned b_dbo:2;
  91         unsigned b_resv4:1;
  92         unsigned b_ddtb:1;
  93         unsigned b_resv5:2;
  94         unsigned b_sgbl:1;
  95         unsigned b_sbo:2;
  96         unsigned b_resv6:1;
  97         unsigned b_sdtb:1;
  98         unsigned b_resv7:9;
  99 } ibdbits_t;
 100
 101 #pragma pack(1)
 102 typedef union ibdbitsu {
 103         ibdbits_t b;
 104         uint i;
 105 } ibdbitsu_t;
 106
 107 #pragma pack(1)
 108 typedef struct idma_buf_desc {
 109         ibdbitsu_t ibd_bits;            /* Status and Control */
 110         uint ibd_datlen;                /* Data length in buffer */
 111         uint ibd_sbuf;                  /* Source buffer addr in host mem */
 112         uint ibd_dbuf;                  /* Destination buffer addr in host mem */
 113 } ibd_t;
 114
 115
 116 #pragma pack(1)
 117 typedef struct dcmbits {
 118         unsigned b_fb:1;
 119         unsigned b_lp:1;
 120         unsigned b_resv1:3;
 121         unsigned b_tc2:1;
 122         unsigned b_resv2:1;
 123         unsigned b_wrap:3;
 124         unsigned b_sinc:1;
 125         unsigned b_dinc:1;
 126         unsigned b_erm:1;
 127         unsigned b_dt:1;
 128         unsigned b_sd:2;
 129 } dcmbits_t;
 130
 131 #pragma pack(1)
 132 typedef union dcmbitsu {
 133         dcmbits_t b;
 134         ushort i;
 135 } dcmbitsu_t;
 136
 137 #pragma pack(1)
 138 typedef struct pram_idma {
 139         ushort pi_ibase;
 140         dcmbitsu_t pi_dcmbits;
 141         ushort pi_ibdptr;
 142         ushort pi_dprbuf;
 143         ushort pi_bufinv;               /* internal to CPM */
 144         ushort pi_ssmax;
 145         ushort pi_dprinptr;             /* internal to CPM */
 146         ushort pi_sts;
 147         ushort pi_dproutptr;            /* internal to CPM */
 148         ushort pi_seob;
 149         ushort pi_deob;
 150         ushort pi_dts;
 151         ushort pi_retadd;
 152         ushort pi_resv1;                /* internal to CPM */
 153         uint pi_bdcnt;
 154         uint pi_sptr;
 155         uint pi_dptr;
 156         uint pi_istate;
 157 } pram_idma_t;
 158
 159
 160 volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR;
 161 volatile ibd_t *bdf;
 162 volatile pram_idma_t *piptr;
 163
 164 volatile int dmadone;
 165 volatile int *dmadonep = &dmadone;
 166 void dmadone_handler (void *);
 167
 168 int idma_init (void);
 169 void idma_start (int, int, int, uint, uint, int);
 170 uint dpalloc (uint, uint);
 171
 172
 173 uint dpinit_done = 0;
 174
 175
 176 #ifdef STANDALONE
 177 int ctrlc (void)
 178 {
 179         if (tstc()) {
 180                 switch (getc ()) {
 181                 case 0x03:              /* ^C - Control C */
 182                         return 1;
 183                 default:
 184                         break;
 185                 }
 186         }
 187         return 0;
 188 }
 189 int memcmp(const void * cs,const void * ct,size_t count)
 190 {
 191         const unsigned char *su1, *su2;
 192         int res = 0;
 193         for( su1 = cs, su2 = ct; 0 < count; ++su1, ++su2, count--)
 194                 if ((res = *su1 - *su2) != 0)
 195                         break;
 196         return res;
 197 }
 198 #endif  /* STANDALONE */
 199
 200 #ifdef STANDALONE
 201 int mem_to_mem_idma2intr (int argc, char * const argv[])
 202 #else
 203 int do_idma (bd_t * bd, int argc, char * const argv[])
 204 #endif  /* STANDALONE */
 205 {
 206         int i;
 207
 208         app_startup(argv);
 209         dpinit_done = 0;
 210
 211         idma_init ();
 212
 213         DEBUG ("Installing dma handler\n");
 214         install_hdlr (7, dmadone_handler, (void *) bdf);
 215
 216         memset ((void *) 0x100000, 'a', 512);
 217         memset ((void *) 0x200000, 'b', 512);
 218
 219         for (i = 0; i < 32; i++) {
 220                 printf ("Startin IDMA, iteration=%d\n", i);
 221                 idma_start (1, 1, 512, 0x100000, 0x200000, 3);
 222         }
 223
 224         DEBUG ("Uninstalling dma handler\n");
 225         free_hdlr (7);
 226
 227         return 0;
 228 }
 229
 230 void
 231 idma_start (int sinc, int dinc, int sz, uint sbuf, uint dbuf, int ttype)
 232 {
 233         /* ttype is for M-M, M-P, P-M or P-P: not used for now */
 234
 235         piptr->pi_istate = 0;   /* manual says: clear it before every START_IDMA */
 236         piptr->pi_dcmbits.b.b_resv1 = 0;
 237
 238         if (sinc == 1)
 239                 piptr->pi_dcmbits.b.b_sinc = 1;
 240         else
 241                 piptr->pi_dcmbits.b.b_sinc = 0;
 242
 243         if (dinc == 1)
 244                 piptr->pi_dcmbits.b.b_dinc = 1;
 245         else
 246                 piptr->pi_dcmbits.b.b_dinc = 0;
 247
 248         piptr->pi_dcmbits.b.b_erm = 0;
 249         piptr->pi_dcmbits.b.b_sd = 0x00;        /* M-M */
 250
 251         bdf->ibd_sbuf = sbuf;
 252         bdf->ibd_dbuf = dbuf;
 253         bdf->ibd_bits.b.b_cm = 0;
 254         bdf->ibd_bits.b.b_interrupt = 1;
 255         bdf->ibd_bits.b.b_wrap = 1;
 256         bdf->ibd_bits.b.b_last = 1;
 257         bdf->ibd_bits.b.b_sdn = 0;
 258         bdf->ibd_bits.b.b_ddn = 0;
 259         bdf->ibd_bits.b.b_dgbl = 0;
 260         bdf->ibd_bits.b.b_ddtb = 0;
 261         bdf->ibd_bits.b.b_sgbl = 0;
 262         bdf->ibd_bits.b.b_sdtb = 0;
 263         bdf->ibd_bits.b.b_dbo = 1;
 264         bdf->ibd_bits.b.b_sbo = 1;
 265         bdf->ibd_bits.b.b_valid = 1;
 266         bdf->ibd_datlen = 512;
 267
 268         *dmadonep = 0;
 269
 270         immap->im_sdma.sdma_idmr2 = (uchar) 0xf;
 271
 272         immap->im_cpm.cp_cpcr = mk_cr_cmd (CPM_CR_IDMA2_PAGE,
 273                                            CPM_CR_IDMA2_SBLOCK, 0x0,
 274                                            0x9) | 0x00010000;
 275
 276         while (*dmadonep != 1) {
 277                 if (ctrlc ()) {
 278                         DEBUG ("\nInterrupted waiting for DMA interrupt.\n");
 279                         goto done;
 280                 }
 281                 printf ("Waiting for DMA interrupt (dmadone=%d b_valid = %d)...\n",
 282                         dmadone, bdf->ibd_bits.b.b_valid);
 283                 udelay (1000000);
 284         }
 285         printf ("DMA complete notification received!\n");
 286
 287   done:
 288         DEBUG ("memcmp(0x%08x, 0x%08x, 512) = %d\n",
 289                 sbuf, dbuf, memcmp ((void *) sbuf, (void *) dbuf, 512));
 290
 291         return;
 292 }
 293
 294 #define MAX_INT_BUFSZ   64
 295 #define DCM_WRAP         0      /* MUST be consistant with MAX_INT_BUFSZ */
 296
 297 int idma_init (void)
 298 {
 299         uint memaddr;
 300
 301         immap->im_cpm.cp_rccr &= ~0x00F3FFFF;
 302         immap->im_cpm.cp_rccr |= 0x00A00A00;
 303
 304         memaddr = dpalloc (sizeof (pram_idma_t), 64);
 305
 306         *(volatile u16 *)&immap->im_dprambase16
 307                 [PROFF_IDMA2_BASE / sizeof(u16)] = memaddr;
 308         piptr = (volatile pram_idma_t *) ((uint) (immap) + memaddr);
 309
 310         piptr->pi_resv1 = 0;            /* manual says: clear it */
 311         piptr->pi_dcmbits.b.b_fb = 0;
 312         piptr->pi_dcmbits.b.b_lp = 1;
 313         piptr->pi_dcmbits.b.b_erm = 0;
 314         piptr->pi_dcmbits.b.b_dt = 0;
 315
 316         memaddr = (uint) dpalloc (sizeof (ibd_t), 64);
 317         piptr->pi_ibase = piptr->pi_ibdptr = (volatile short) memaddr;
 318         bdf = (volatile ibd_t *) ((uint) (immap) + memaddr);
 319         bdf->ibd_bits.b.b_valid = 0;
 320
 321         memaddr = (uint) dpalloc (64, 64);
 322         piptr->pi_dprbuf = (volatile ushort) memaddr;
 323         piptr->pi_dcmbits.b.b_wrap = 4;
 324         piptr->pi_ssmax = 32;
 325
 326         piptr->pi_sts = piptr->pi_ssmax;
 327         piptr->pi_dts = piptr->pi_ssmax;
 328
 329         return 1;
 330 }
 331
 332 void dmadone_handler (void *arg)
 333 {
 334         immap->im_sdma.sdma_idmr2 = (uchar) 0x0;
 335
 336         *dmadonep = 1;
 337
 338         return;
 339 }
 340
 341
 342 static uint dpbase = 0;
 343
 344 uint dpalloc (uint size, uint align)
 345 {
 346         volatile immap_t *immr = (immap_t *) CONFIG_SYS_IMMR;
 347         uint retloc;
 348         uint align_mask, off;
 349         uint savebase;
 350
 351         /* Pointer to initial global data area */
 352
 353         if (dpinit_done == 0) {
 354                 dpbase = gd->arch.dp_alloc_base;
 355                 dpinit_done = 1;
 356         }
 357
 358         align_mask = align - 1;
 359         savebase = dpbase;
 360
 361         if ((off = (dpbase & align_mask)) != 0)
 362                 dpbase += (align - off);
 363
 364         if ((off = size & align_mask) != 0)
 365                 size += align - off;
 366
 367         if ((dpbase + size) >= gd->arch.dp_alloc_top) {
 368                 dpbase = savebase;
 369                 printf ("dpalloc: ran out of dual port ram!");
 370                 return 0;
 371         }
 372
 373         retloc = dpbase;
 374         dpbase += size;
 375
 376         memset ((void *) &immr->im_dprambase[retloc], 0, size);
 377
 378         return (retloc);
 379 }