drivers/fpga/lattice.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * (C) Copyright 2010
   4  * Stefano Babic, DENX Software Engineering, sbabic@denx.de.
   5  *
   6  * (C) Copyright 2002
   7  * Rich Ireland, Enterasys Networks, rireland@enterasys.com.
   8  *
   9  * ispVM functions adapted from Lattice's ispmVMEmbedded code:
  10  * Copyright 2009 Lattice Semiconductor Corp.
  11  */
  12
  13 #include <common.h>
  14 #include <log.h>
  15 #include <malloc.h>
  16 #include <fpga.h>
  17 #include <lattice.h>
  18 #include <linux/delay.h>
  19
  20 static lattice_board_specific_func *pfns;
  21 static const char *fpga_image;
  22 static unsigned long read_bytes;
  23 static unsigned long bufsize;
  24 static unsigned short expectedCRC;
  25
  26 /*
  27  * External variables and functions declared in ivm_core.c module.
  28  */
  29 extern unsigned short g_usCalculatedCRC;
  30 extern unsigned short g_usDataType;
  31 extern unsigned char *g_pucIntelBuffer;
  32 extern unsigned char *g_pucHeapMemory;
  33 extern unsigned short g_iHeapCounter;
  34 extern unsigned short g_iHEAPSize;
  35 extern unsigned short g_usIntelDataIndex;
  36 extern unsigned short g_usIntelBufferSize;
  37 extern char *const g_szSupportedVersions[];
  38
  39
  40 /*
  41  * ispVMDelay
  42  *
  43  * Users must implement a delay to observe a_usTimeDelay, where
  44  * bit 15 of the a_usTimeDelay defines the unit.
  45  *      1 = milliseconds
  46  *      0 = microseconds
  47  * Example:
  48  *      a_usTimeDelay = 0x0001 = 1 microsecond delay.
  49  *      a_usTimeDelay = 0x8001 = 1 millisecond delay.
  50  *
  51  * This subroutine is called upon to provide a delay from 1 millisecond to a few
  52  * hundreds milliseconds each time.
  53  * It is understood that due to a_usTimeDelay is defined as unsigned short, a 16
  54  * bits integer, this function is restricted to produce a delay to 64000
  55  * micro-seconds or 32000 milli-second maximum. The VME file will never pass on
  56  * to this function a delay time > those maximum number. If it needs more than
  57  * those maximum, the VME file will launch the delay function several times to
  58  * realize a larger delay time cummulatively.
  59  * It is perfectly alright to provide a longer delay than required. It is not
  60  * acceptable if the delay is shorter.
  61  */
  62 void ispVMDelay(unsigned short delay)
  63 {
  64         if (delay & 0x8000)
  65                 delay = (delay & ~0x8000) * 1000;
  66         udelay(delay);
  67 }
  68
  69 void writePort(unsigned char a_ucPins, unsigned char a_ucValue)
  70 {
  71         a_ucValue = a_ucValue ? 1 : 0;
  72
  73         switch (a_ucPins) {
  74         case g_ucPinTDI:
  75                 pfns->jtag_set_tdi(a_ucValue);
  76                 break;
  77         case g_ucPinTCK:
  78                 pfns->jtag_set_tck(a_ucValue);
  79                 break;
  80         case g_ucPinTMS:
  81                 pfns->jtag_set_tms(a_ucValue);
  82                 break;
  83         default:
  84                 printf("%s: requested unknown pin\n", __func__);
  85         }
  86 }
  87
  88 unsigned char readPort(void)
  89 {
  90         return pfns->jtag_get_tdo();
  91 }
  92
  93 void sclock(void)
  94 {
  95         writePort(g_ucPinTCK, 0x01);
  96         writePort(g_ucPinTCK, 0x00);
  97 }
  98
  99 void calibration(void)
 100 {
 101         /* Apply 2 pulses to TCK. */
 102         writePort(g_ucPinTCK, 0x00);
 103         writePort(g_ucPinTCK, 0x01);
 104         writePort(g_ucPinTCK, 0x00);
 105         writePort(g_ucPinTCK, 0x01);
 106         writePort(g_ucPinTCK, 0x00);
 107
 108         ispVMDelay(0x8001);
 109
 110         /* Apply 2 pulses to TCK. */
 111         writePort(g_ucPinTCK, 0x01);
 112         writePort(g_ucPinTCK, 0x00);
 113         writePort(g_ucPinTCK, 0x01);
 114         writePort(g_ucPinTCK, 0x00);
 115 }
 116
 117 /*
 118  * GetByte
 119  *
 120  * Returns a byte to the caller. The returned byte depends on the
 121  * g_usDataType register. If the HEAP_IN bit is set, then the byte
 122  * is returned from the HEAP. If the LHEAP_IN bit is set, then
 123  * the byte is returned from the intelligent buffer. Otherwise,
 124  * the byte is returned directly from the VME file.
 125  */
 126 unsigned char GetByte(void)
 127 {
 128         unsigned char ucData;
 129         unsigned int block_size = 4 * 1024;
 130
 131         if (g_usDataType & HEAP_IN) {
 132
 133                 /*
 134                  * Get data from repeat buffer.
 135                  */
 136
 137                 if (g_iHeapCounter > g_iHEAPSize) {
 138
 139                         /*
 140                          * Data over-run.
 141                          */
 142
 143                         return 0xFF;
 144                 }
 145
 146                 ucData = g_pucHeapMemory[g_iHeapCounter++];
 147         } else if (g_usDataType & LHEAP_IN) {
 148
 149                 /*
 150                  * Get data from intel buffer.
 151                  */
 152
 153                 if (g_usIntelDataIndex >= g_usIntelBufferSize) {
 154                         return 0xFF;
 155                 }
 156
 157                 ucData = g_pucIntelBuffer[g_usIntelDataIndex++];
 158         } else {
 159                 if (read_bytes == bufsize) {
 160                         return 0xFF;
 161                 }
 162                 ucData = *fpga_image++;
 163                 read_bytes++;
 164
 165                 if (!(read_bytes % block_size)) {
 166                         printf("Downloading FPGA %ld/%ld completed\r",
 167                                 read_bytes,
 168                                 bufsize);
 169                 }
 170
 171                 if (expectedCRC != 0) {
 172                         ispVMCalculateCRC32(ucData);
 173                 }
 174         }
 175
 176         return ucData;
 177 }
 178
 179 signed char ispVM(void)
 180 {
 181         char szFileVersion[9]      = { 0 };
 182         signed char cRetCode         = 0;
 183         signed char cIndex           = 0;
 184         signed char cVersionIndex    = 0;
 185         unsigned char ucReadByte     = 0;
 186         unsigned short crc;
 187
 188         g_pucHeapMemory         = NULL;
 189         g_iHeapCounter          = 0;
 190         g_iHEAPSize             = 0;
 191         g_usIntelDataIndex      = 0;
 192         g_usIntelBufferSize     = 0;
 193         g_usCalculatedCRC = 0;
 194         expectedCRC   = 0;
 195         ucReadByte = GetByte();
 196         switch (ucReadByte) {
 197         case FILE_CRC:
 198                 crc = (unsigned char)GetByte();
 199                 crc <<= 8;
 200                 crc |= GetByte();
 201                 expectedCRC = crc;
 202
 203                 for (cIndex = 0; cIndex < 8; cIndex++)
 204                         szFileVersion[cIndex] = GetByte();
 205
 206                 break;
 207         default:
 208                 szFileVersion[0] = (signed char) ucReadByte;
 209                 for (cIndex = 1; cIndex < 8; cIndex++)
 210                         szFileVersion[cIndex] = GetByte();
 211
 212                 break;
 213         }
 214
 215         /*
 216          *
 217          * Compare the VME file version against the supported version.
 218          *
 219          */
 220
 221         for (cVersionIndex = 0; g_szSupportedVersions[cVersionIndex] != 0;
 222                 cVersionIndex++) {
 223                 for (cIndex = 0; cIndex < 8; cIndex++) {
 224                         if (szFileVersion[cIndex] !=
 225                                 g_szSupportedVersions[cVersionIndex][cIndex]) {
 226                                 cRetCode = VME_VERSION_FAILURE;
 227                                 break;
 228                         }
 229                         cRetCode = 0;
 230                 }
 231
 232                 if (cRetCode == 0) {
 233                         break;
 234                 }
 235         }
 236
 237         if (cRetCode < 0) {
 238                 return VME_VERSION_FAILURE;
 239         }
 240
 241         printf("VME file checked: starting downloading to FPGA\n");
 242
 243         ispVMStart();
 244
 245         cRetCode = ispVMCode();
 246
 247         ispVMEnd();
 248         ispVMFreeMem();
 249         puts("\n");
 250
 251         if (cRetCode == 0 && expectedCRC != 0 &&
 252                         (expectedCRC != g_usCalculatedCRC)) {
 253                 printf("Expected CRC:   0x%.4X\n", expectedCRC);
 254                 printf("Calculated CRC: 0x%.4X\n", g_usCalculatedCRC);
 255                 return VME_CRC_FAILURE;
 256         }
 257         return cRetCode;
 258 }
 259
 260 static int lattice_validate(Lattice_desc *desc, const char *fn)
 261 {
 262         int ret_val = false;
 263
 264         if (desc) {
 265                 if ((desc->family > min_lattice_type) &&
 266                         (desc->family < max_lattice_type)) {
 267                         if ((desc->iface > min_lattice_iface_type) &&
 268                                 (desc->iface < max_lattice_iface_type)) {
 269                                 if (desc->size) {
 270                                         ret_val = true;
 271                                 } else {
 272                                         printf("%s: NULL part size\n", fn);
 273                                 }
 274                         } else {
 275                                 printf("%s: Invalid Interface type, %d\n",
 276                                         fn, desc->iface);
 277                         }
 278                 } else {
 279                         printf("%s: Invalid family type, %d\n",
 280                                 fn, desc->family);
 281                 }
 282         } else {
 283                 printf("%s: NULL descriptor!\n", fn);
 284         }
 285
 286         return ret_val;
 287 }
 288
 289 int lattice_load(Lattice_desc *desc, const void *buf, size_t bsize)
 290 {
 291         int ret_val = FPGA_FAIL;
 292
 293         if (!lattice_validate(desc, (char *)__func__)) {
 294                 printf("%s: Invalid device descriptor\n", __func__);
 295         } else {
 296                 pfns = desc->iface_fns;
 297
 298                 switch (desc->family) {
 299                 case Lattice_XP2:
 300                         fpga_image = buf;
 301                         read_bytes = 0;
 302                         bufsize = bsize;
 303                         debug("%s: Launching the Lattice ISPVME Loader:"
 304                                 " addr %p size 0x%lx...\n",
 305                                 __func__, fpga_image, bufsize);
 306                         ret_val = ispVM();
 307                         if (ret_val)
 308                                 printf("%s: error %d downloading FPGA image\n",
 309                                         __func__, ret_val);
 310                         else
 311                                 puts("FPGA downloaded successfully\n");
 312                         break;
 313                 default:
 314                         printf("%s: Unsupported family type, %d\n",
 315                                         __func__, desc->family);
 316                 }
 317         }
 318
 319         return ret_val;
 320 }
 321
 322 int lattice_dump(Lattice_desc *desc, const void *buf, size_t bsize)
 323 {
 324         puts("Dump not supported for Lattice FPGA\n");
 325
 326         return FPGA_FAIL;
 327
 328 }
 329
 330 int lattice_info(Lattice_desc *desc)
 331 {
 332         int ret_val = FPGA_FAIL;
 333
 334         if (lattice_validate(desc, (char *)__func__)) {
 335                 printf("Family:        \t");
 336                 switch (desc->family) {
 337                 case Lattice_XP2:
 338                         puts("XP2\n");
 339                         break;
 340                         /* Add new family types here */
 341                 default:
 342                         printf("Unknown family type, %d\n", desc->family);
 343                 }
 344
 345                 puts("Interface type:\t");
 346                 switch (desc->iface) {
 347                 case lattice_jtag_mode:
 348                         puts("JTAG Mode\n");
 349                         break;
 350                         /* Add new interface types here */
 351                 default:
 352                         printf("Unsupported interface type, %d\n", desc->iface);
 353                 }
 354
 355                 printf("Device Size:   \t%d bytes\n",
 356                                 desc->size);
 357
 358                 if (desc->iface_fns) {
 359                         printf("Device Function Table @ 0x%p\n",
 360                                 desc->iface_fns);
 361                         switch (desc->family) {
 362                         case Lattice_XP2:
 363                                 break;
 364                                 /* Add new family types here */
 365                         default:
 366                                 break;
 367                         }
 368                 } else {
 369                         puts("No Device Function Table.\n");
 370                 }
 371
 372                 if (desc->desc)
 373                         printf("Model:         \t%s\n", desc->desc);
 374
 375                 ret_val = FPGA_SUCCESS;
 376         } else {
 377                 printf("%s: Invalid device descriptor\n", __func__);
 378         }
 379
 380         return ret_val;
 381 }