hw/ssi/omap_spi.c

   1 /*
   2  * TI OMAP processor's Multichannel SPI emulation.
   3  *
   4  * Copyright (C) 2007-2009 Nokia Corporation
   5  *
   6  * Original code for OMAP2 by Andrzej Zaborowski <andrew@openedhand.com>
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 or
  11  * (at your option) any later version of the License.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License along
  19  * with this program; if not, write to the Free Software Foundation, Inc.,
  20  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  21  */
  22 #include "hw/hw.h"
  23 #include "hw/arm/omap.h"
  24
  25 /* Multichannel SPI */
  26 struct omap_mcspi_s {
  27     MemoryRegion iomem;
  28     qemu_irq irq;
  29     int chnum;
  30
  31     uint32_t sysconfig;
  32     uint32_t systest;
  33     uint32_t irqst;
  34     uint32_t irqen;
  35     uint32_t wken;
  36     uint32_t control;
  37
  38     struct omap_mcspi_ch_s {
  39         qemu_irq txdrq;
  40         qemu_irq rxdrq;
  41         uint32_t (*txrx)(void *opaque, uint32_t, int);
  42         void *opaque;
  43
  44         uint32_t tx;
  45         uint32_t rx;
  46
  47         uint32_t config;
  48         uint32_t status;
  49         uint32_t control;
  50     } ch[4];
  51 };
  52
  53 static inline void omap_mcspi_interrupt_update(struct omap_mcspi_s *s)
  54 {
  55     qemu_set_irq(s->irq, s->irqst & s->irqen);
  56 }
  57
  58 static inline void omap_mcspi_dmarequest_update(struct omap_mcspi_ch_s *ch)
  59 {
  60     qemu_set_irq(ch->txdrq,
  61                     (ch->control & 1) &&                /* EN */
  62                     (ch->config & (1 << 14)) &&         /* DMAW */
  63                     (ch->status & (1 << 1)) &&          /* TXS */
  64                     ((ch->config >> 12) & 3) != 1);     /* TRM */
  65     qemu_set_irq(ch->rxdrq,
  66                     (ch->control & 1) &&                /* EN */
  67                     (ch->config & (1 << 15)) &&         /* DMAW */
  68                     (ch->status & (1 << 0)) &&          /* RXS */
  69                     ((ch->config >> 12) & 3) != 2);     /* TRM */
  70 }
  71
  72 static void omap_mcspi_transfer_run(struct omap_mcspi_s *s, int chnum)
  73 {
  74     struct omap_mcspi_ch_s *ch = s->ch + chnum;
  75
  76     if (!(ch->control & 1))                             /* EN */
  77         return;
  78     if ((ch->status & (1 << 0)) &&                      /* RXS */
  79                     ((ch->config >> 12) & 3) != 2 &&    /* TRM */
  80                     !(ch->config & (1 << 19)))          /* TURBO */
  81         goto intr_update;
  82     if ((ch->status & (1 << 1)) &&                      /* TXS */
  83                     ((ch->config >> 12) & 3) != 1)      /* TRM */
  84         goto intr_update;
  85
  86     if (!(s->control & 1) ||                            /* SINGLE */
  87                     (ch->config & (1 << 20))) {         /* FORCE */
  88         if (ch->txrx)
  89             ch->rx = ch->txrx(ch->opaque, ch->tx,       /* WL */
  90                             1 + (0x1f & (ch->config >> 7)));
  91     }
  92
  93     ch->tx = 0;
  94     ch->status |= 1 << 2;                               /* EOT */
  95     ch->status |= 1 << 1;                               /* TXS */
  96     if (((ch->config >> 12) & 3) != 2)                  /* TRM */
  97         ch->status |= 1 << 0;                           /* RXS */
  98
  99 intr_update:
 100     if ((ch->status & (1 << 0)) &&                      /* RXS */
 101                     ((ch->config >> 12) & 3) != 2 &&    /* TRM */
 102                     !(ch->config & (1 << 19)))          /* TURBO */
 103         s->irqst |= 1 << (2 + 4 * chnum);               /* RX_FULL */
 104     if ((ch->status & (1 << 1)) &&                      /* TXS */
 105                     ((ch->config >> 12) & 3) != 1)      /* TRM */
 106         s->irqst |= 1 << (0 + 4 * chnum);               /* TX_EMPTY */
 107     omap_mcspi_interrupt_update(s);
 108     omap_mcspi_dmarequest_update(ch);
 109 }
 110
 111 void omap_mcspi_reset(struct omap_mcspi_s *s)
 112 {
 113     int ch;
 114
 115     s->sysconfig = 0;
 116     s->systest = 0;
 117     s->irqst = 0;
 118     s->irqen = 0;
 119     s->wken = 0;
 120     s->control = 4;
 121
 122     for (ch = 0; ch < 4; ch ++) {
 123         s->ch[ch].config = 0x060000;
 124         s->ch[ch].status = 2;                           /* TXS */
 125         s->ch[ch].control = 0;
 126
 127         omap_mcspi_dmarequest_update(s->ch + ch);
 128     }
 129
 130     omap_mcspi_interrupt_update(s);
 131 }
 132
 133 static uint64_t omap_mcspi_read(void *opaque, hwaddr addr,
 134                                 unsigned size)
 135 {
 136     struct omap_mcspi_s *s = (struct omap_mcspi_s *) opaque;
 137     int ch = 0;
 138     uint32_t ret;
 139
 140     if (size != 4) {
 141         return omap_badwidth_read32(opaque, addr);
 142     }
 143
 144     switch (addr) {
 145     case 0x00:  /* MCSPI_REVISION */
 146         return 0x91;
 147
 148     case 0x10:  /* MCSPI_SYSCONFIG */
 149         return s->sysconfig;
 150
 151     case 0x14:  /* MCSPI_SYSSTATUS */
 152         return 1;                                       /* RESETDONE */
 153
 154     case 0x18:  /* MCSPI_IRQSTATUS */
 155         return s->irqst;
 156
 157     case 0x1c:  /* MCSPI_IRQENABLE */
 158         return s->irqen;
 159
 160     case 0x20:  /* MCSPI_WAKEUPENABLE */
 161         return s->wken;
 162
 163     case 0x24:  /* MCSPI_SYST */
 164         return s->systest;
 165
 166     case 0x28:  /* MCSPI_MODULCTRL */
 167         return s->control;
 168
 169     case 0x68: ch ++;
 170         /* fall through */
 171     case 0x54: ch ++;
 172         /* fall through */
 173     case 0x40: ch ++;
 174         /* fall through */
 175     case 0x2c:  /* MCSPI_CHCONF */
 176         return s->ch[ch].config;
 177
 178     case 0x6c: ch ++;
 179         /* fall through */
 180     case 0x58: ch ++;
 181         /* fall through */
 182     case 0x44: ch ++;
 183         /* fall through */
 184     case 0x30:  /* MCSPI_CHSTAT */
 185         return s->ch[ch].status;
 186
 187     case 0x70: ch ++;
 188         /* fall through */
 189     case 0x5c: ch ++;
 190         /* fall through */
 191     case 0x48: ch ++;
 192         /* fall through */
 193     case 0x34:  /* MCSPI_CHCTRL */
 194         return s->ch[ch].control;
 195
 196     case 0x74: ch ++;
 197         /* fall through */
 198     case 0x60: ch ++;
 199         /* fall through */
 200     case 0x4c: ch ++;
 201         /* fall through */
 202     case 0x38:  /* MCSPI_TX */
 203         return s->ch[ch].tx;
 204
 205     case 0x78: ch ++;
 206         /* fall through */
 207     case 0x64: ch ++;
 208         /* fall through */
 209     case 0x50: ch ++;
 210         /* fall through */
 211     case 0x3c:  /* MCSPI_RX */
 212         s->ch[ch].status &= ~(1 << 0);                  /* RXS */
 213         ret = s->ch[ch].rx;
 214         omap_mcspi_transfer_run(s, ch);
 215         return ret;
 216     }
 217
 218     OMAP_BAD_REG(addr);
 219     return 0;
 220 }
 221
 222 static void omap_mcspi_write(void *opaque, hwaddr addr,
 223                              uint64_t value, unsigned size)
 224 {
 225     struct omap_mcspi_s *s = (struct omap_mcspi_s *) opaque;
 226     int ch = 0;
 227
 228     if (size != 4) {
 229         omap_badwidth_write32(opaque, addr, value);
 230         return;
 231     }
 232
 233     switch (addr) {
 234     case 0x00:  /* MCSPI_REVISION */
 235     case 0x14:  /* MCSPI_SYSSTATUS */
 236     case 0x30:  /* MCSPI_CHSTAT0 */
 237     case 0x3c:  /* MCSPI_RX0 */
 238     case 0x44:  /* MCSPI_CHSTAT1 */
 239     case 0x50:  /* MCSPI_RX1 */
 240     case 0x58:  /* MCSPI_CHSTAT2 */
 241     case 0x64:  /* MCSPI_RX2 */
 242     case 0x6c:  /* MCSPI_CHSTAT3 */
 243     case 0x78:  /* MCSPI_RX3 */
 244         OMAP_RO_REG(addr);
 245         return;
 246
 247     case 0x10:  /* MCSPI_SYSCONFIG */
 248         if (value & (1 << 1))                           /* SOFTRESET */
 249             omap_mcspi_reset(s);
 250         s->sysconfig = value & 0x31d;
 251         break;
 252
 253     case 0x18:  /* MCSPI_IRQSTATUS */
 254         if (!((s->control & (1 << 3)) && (s->systest & (1 << 11)))) {
 255             s->irqst &= ~value;
 256             omap_mcspi_interrupt_update(s);
 257         }
 258         break;
 259
 260     case 0x1c:  /* MCSPI_IRQENABLE */
 261         s->irqen = value & 0x1777f;
 262         omap_mcspi_interrupt_update(s);
 263         break;
 264
 265     case 0x20:  /* MCSPI_WAKEUPENABLE */
 266         s->wken = value & 1;
 267         break;
 268
 269     case 0x24:  /* MCSPI_SYST */
 270         if (s->control & (1 << 3))                      /* SYSTEM_TEST */
 271             if (value & (1 << 11)) {                    /* SSB */
 272                 s->irqst |= 0x1777f;
 273                 omap_mcspi_interrupt_update(s);
 274             }
 275         s->systest = value & 0xfff;
 276         break;
 277
 278     case 0x28:  /* MCSPI_MODULCTRL */
 279         if (value & (1 << 3))                           /* SYSTEM_TEST */
 280             if (s->systest & (1 << 11)) {               /* SSB */
 281                 s->irqst |= 0x1777f;
 282                 omap_mcspi_interrupt_update(s);
 283             }
 284         s->control = value & 0xf;
 285         break;
 286
 287     case 0x68: ch ++;
 288         /* fall through */
 289     case 0x54: ch ++;
 290         /* fall through */
 291     case 0x40: ch ++;
 292         /* fall through */
 293     case 0x2c:  /* MCSPI_CHCONF */
 294         if ((value ^ s->ch[ch].config) & (3 << 14))     /* DMAR | DMAW */
 295             omap_mcspi_dmarequest_update(s->ch + ch);
 296         if (((value >> 12) & 3) == 3)                   /* TRM */
 297             fprintf(stderr, "%s: invalid TRM value (3)\n", __FUNCTION__);
 298         if (((value >> 7) & 0x1f) < 3)                  /* WL */
 299             fprintf(stderr, "%s: invalid WL value (%" PRIx64 ")\n",
 300                             __FUNCTION__, (value >> 7) & 0x1f);
 301         s->ch[ch].config = value & 0x7fffff;
 302         break;
 303
 304     case 0x70: ch ++;
 305         /* fall through */
 306     case 0x5c: ch ++;
 307         /* fall through */
 308     case 0x48: ch ++;
 309         /* fall through */
 310     case 0x34:  /* MCSPI_CHCTRL */
 311         if (value & ~s->ch[ch].control & 1) {           /* EN */
 312             s->ch[ch].control |= 1;
 313             omap_mcspi_transfer_run(s, ch);
 314         } else
 315             s->ch[ch].control = value & 1;
 316         break;
 317
 318     case 0x74: ch ++;
 319         /* fall through */
 320     case 0x60: ch ++;
 321         /* fall through */
 322     case 0x4c: ch ++;
 323         /* fall through */
 324     case 0x38:  /* MCSPI_TX */
 325         s->ch[ch].tx = value;
 326         s->ch[ch].status &= ~(1 << 1);                  /* TXS */
 327         omap_mcspi_transfer_run(s, ch);
 328         break;
 329
 330     default:
 331         OMAP_BAD_REG(addr);
 332         return;
 333     }
 334 }
 335
 336 static const MemoryRegionOps omap_mcspi_ops = {
 337     .read = omap_mcspi_read,
 338     .write = omap_mcspi_write,
 339     .endianness = DEVICE_NATIVE_ENDIAN,
 340 };
 341
 342 struct omap_mcspi_s *omap_mcspi_init(struct omap_target_agent_s *ta, int chnum,
 343                 qemu_irq irq, qemu_irq *drq, omap_clk fclk, omap_clk iclk)
 344 {
 345     struct omap_mcspi_s *s = g_new0(struct omap_mcspi_s, 1);
 346     struct omap_mcspi_ch_s *ch = s->ch;
 347
 348     s->irq = irq;
 349     s->chnum = chnum;
 350     while (chnum --) {
 351         ch->txdrq = *drq ++;
 352         ch->rxdrq = *drq ++;
 353         ch ++;
 354     }
 355     omap_mcspi_reset(s);
 356
 357     memory_region_init_io(&s->iomem, NULL, &omap_mcspi_ops, s, "omap.mcspi",
 358                           omap_l4_region_size(ta, 0));
 359     omap_l4_attach(ta, 0, &s->iomem);
 360
 361     return s;
 362 }
 363
 364 void omap_mcspi_attach(struct omap_mcspi_s *s,
 365                 uint32_t (*txrx)(void *opaque, uint32_t, int), void *opaque,
 366                 int chipselect)
 367 {
 368     if (chipselect < 0 || chipselect >= s->chnum)
 369         hw_error("%s: Bad chipselect %i\n", __FUNCTION__, chipselect);
 370
 371     s->ch[chipselect].txrx = txrx;
 372     s->ch[chipselect].opaque = opaque;
 373 }