2 * This file is part of the coreboot project.
4 * Copyright (C) 2007 Advanced Micro Devices, Inc.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20 #include <cpu/amd/lxdef.h>
23 #include "southbridge/amd/cs5536/cs5536.h"
25 static const unsigned char NumColAddr[] = {
26 0x00, 0x10, 0x11, 0x00, 0x00, 0x00, 0x00, 0x07,
27 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F
30 void banner(const char *s)
32 print_debug("===========================");
34 print_debug("======================================\r\n");
39 print_emerg("DIE\r\n");
40 /* this guarantees we flush the UART fifos (if any) and also
41 * ensures that things, in general, keep going so no debug output
48 static void auto_size_dimm(unsigned int dimm)
50 uint32_t dimm_setting;
57 banner("Check present");
58 /* Check that we have a dimm */
59 if (spd_read_byte(dimm, SPD_MEMORY_TYPE) == 0xFF) {
64 /* Field: Module Banks per DIMM */
65 /* EEPROM byte usage: (5) Number of DIMM Banks */
66 spd_byte = spd_read_byte(dimm, SPD_NUM_DIMM_BANKS);
67 if ((MIN_MOD_BANKS > spd_byte) || (spd_byte > MAX_MOD_BANKS)) {
68 print_emerg("Number of module banks not compatible\n");
69 POST_CODE(ERROR_BANK_SET);
72 dimm_setting |= (spd_byte >> 1) << CF07_UPPER_D0_MB_SHIFT;
75 /* Field: Banks per SDRAM device */
76 /* EEPROM byte usage: (17) Number of Banks on SDRAM Device */
77 spd_byte = spd_read_byte(dimm, SPD_NUM_BANKS_PER_SDRAM);
78 if ((MIN_DEV_BANKS > spd_byte) || (spd_byte > MAX_DEV_BANKS)) {
79 print_emerg("Number of device banks not compatible\n");
80 POST_CODE(ERROR_BANK_SET);
83 dimm_setting |= (spd_byte >> 2) << CF07_UPPER_D0_CB_SHIFT;
87 *; EEPROM byte usage: (3) Number of Row Addresses
88 *; (4) Number of Column Addresses
89 *; (5) Number of DIMM Banks
90 *; (31) Module Bank Density
91 *; Size = Module Density * Module Banks
93 if ((spd_read_byte(dimm, SPD_NUM_ROWS) & 0xF0)
94 || (spd_read_byte(dimm, SPD_NUM_COLUMNS) & 0xF0)) {
95 print_emerg("Assymetirc DIMM not compatible\n");
96 POST_CODE(ERROR_UNSUPPORTED_DIMM);
99 banner("SPDBANKDENSITY");
101 dimm_size = spd_read_byte(dimm, SPD_BANK_DENSITY);
103 dimm_size |= (dimm_size << 8); /* align so 1GB(bit0) is bit 8, this is a little weird to get gcc to not optimize this out */
104 dimm_size &= 0x01FC; /* and off 2GB DIMM size : not supported and the 1GB size we just moved up to bit 8 as well as all the extra on top */
106 /* Module Density * Module Banks */
107 dimm_size <<= (dimm_setting >> CF07_UPPER_D0_MB_SHIFT) & 1; /* shift to multiply by # DIMM banks */
108 banner("BEFORT CTZ");
109 dimm_size = __builtin_ctz(dimm_size);
110 banner("TEST DIMM SIZE>8");
111 if (dimm_size > 8) { /* 8 is 1GB only support 1GB per DIMM */
112 print_emerg("Only support up to 1 GB per DIMM\n");
113 POST_CODE(ERROR_DENSITY_DIMM);
116 dimm_setting |= dimm_size << CF07_UPPER_D0_SZ_SHIFT;
120 *; EEPROM byte usage: (4) Number of Column Addresses
121 *; PageSize = 2^# Column Addresses * Data width in bytes (should be 8bytes for a normal DIMM)
123 *; But this really works by magic.
124 *;If ma[12:0] is the memory address pins, and pa[12:0] is the physical column address
125 *;that MC generates, here is how the MC assigns the pa onto the ma pins:
127 *;ma 12 11 10 09 08 07 06 05 04 03 02 01 00
128 *;-------------------------------------------
129 *;pa 09 08 07 06 05 04 03 (7 col addr bits = 1K page size)
130 *;pa 10 09 08 07 06 05 04 03 (8 col addr bits = 2K page size)
131 *;pa 11 10 09 08 07 06 05 04 03 (9 col addr bits = 4K page size)
132 *;pa 12 11 10 09 08 07 06 05 04 03 (10 col addr bits = 8K page size)
133 *;pa 13 AP 12 11 10 09 08 07 06 05 04 03 (11 col addr bits = 16K page size)
134 *;pa 14 13 AP 12 11 10 09 08 07 06 05 04 03 (12 col addr bits = 32K page size)
135 *; *AP=autoprecharge bit
137 *;Remember that pa[2:0] are zeroed out since it's a 64-bit data bus (8 bytes),
138 *;so lower 3 address bits are dont_cares.So from the table above,
139 *;it's easier to see what the old code is doing: if for example,#col_addr_bits=7(06h),
140 *;it adds 3 to get 10, then does 2^10=1K. Get it?*/
142 spd_byte = NumColAddr[spd_read_byte(dimm, SPD_NUM_COLUMNS) & 0xF];
143 banner("MAXCOLADDR");
144 if (spd_byte > MAX_COL_ADDR) {
145 print_emerg("DIMM page size not compatible\n");
146 POST_CODE(ERROR_SET_PAGE);
149 banner(">12address test");
151 if (spd_byte > 5) { /* if the value is above 6 it means >12 address lines */
152 spd_byte = 7; /* which means >32k so set to disabled */
154 dimm_setting |= spd_byte << CF07_UPPER_D0_PSZ_SHIFT; /* 0=1k,1=2k,2=4k,etc */
156 banner("RDMSR CF07");
157 msr = rdmsr(MC_CF07_DATA);
158 banner("WRMSR CF07");
160 msr.hi &= 0xFFFF0000;
161 msr.hi |= dimm_setting;
163 msr.hi &= 0x0000FFFF;
164 msr.hi |= dimm_setting << 16;
166 wrmsr(MC_CF07_DATA, msr);
170 static void checkDDRMax(void)
172 uint8_t spd_byte0, spd_byte1;
175 /* PC133 identifier */
176 spd_byte0 = spd_read_byte(DIMM0, SPD_MIN_CYCLE_TIME_AT_CAS_MAX);
177 if (spd_byte0 == 0xFF) {
180 spd_byte1 = spd_read_byte(DIMM1, SPD_MIN_CYCLE_TIME_AT_CAS_MAX);
181 if (spd_byte1 == 0xFF) {
185 /* I don't think you need this check.
186 if (spd_byte0 >= 0xA0 || spd_byte1 >= 0xA0){
187 print_emerg("DIMM overclocked. Check GeodeLink Speed\n");
188 POST_CODE(POST_PLL_MEM_FAIL);
192 /* Use the slowest DIMM */
193 if (spd_byte0 < spd_byte1) {
194 spd_byte0 = spd_byte1;
197 /* Turn SPD ns time into MHZ. Check what the asm does to this math. */
198 speed = 20000 / (((spd_byte0 >> 4) * 10) + (spd_byte0 & 0x0F));
200 /* current speed > max speed? */
201 if (GeodeLinkSpeed() > speed) {
202 print_emerg("DIMM overclocked. Check GeodeLink Speed\r\n");
203 POST_CODE(POST_PLL_MEM_FAIL);
208 const uint16_t REF_RATE[] = { 15, 3, 7, 31, 62, 125 }; /* ns */
210 static void set_refresh_rate(void)
212 uint8_t spd_byte0, spd_byte1;
213 uint16_t rate0, rate1;
216 spd_byte0 = spd_read_byte(DIMM0, SPD_REFRESH);
221 rate0 = REF_RATE[spd_byte0];
223 spd_byte1 = spd_read_byte(DIMM1, SPD_REFRESH);
228 rate1 = REF_RATE[spd_byte1];
230 /* Use the faster rate (lowest number) */
235 msr = rdmsr(MC_CF07_DATA);
236 msr.lo |= ((rate0 * (GeodeLinkSpeed() / 2)) / 16)
237 << CF07_LOWER_REF_INT_SHIFT;
238 wrmsr(MC_CF07_DATA, msr);
241 const uint8_t CASDDR[] = { 5, 5, 2, 6, 3, 7, 4, 0 }; /* 1(1.5), 1.5, 2, 2.5, 3, 3.5, 4, 0 */
243 static void setCAS(void)
245 /*;*****************************************************************************
248 ;* EEPROM byte usage: (18) SDRAM device attributes - CAS latency
249 ;* EEPROM byte usage: (23) SDRAM Minimum Clock Cycle Time @ CLX -.5
250 ;* EEPROM byte usage: (25) SDRAM Minimum Clock Cycle Time @ CLX -1
252 ;* The CAS setting is based on the information provided in each DIMMs SPD.
253 ;* The speed at which a DIMM can run is described relative to the slowest
254 ;* CAS the DIMM supports. Each speed for the relative CAS settings is
255 ;* checked that it is within the GeodeLink speed. If it isn't within the GeodeLink
256 ;* speed, the CAS setting is removed from the list of good settings for
257 ;* the DIMM. This is done for both DIMMs and the lists are compared to
258 ;* find the lowest common CAS latency setting. If there are no CAS settings
259 ;* in common we out a ERROR_DIFF_DIMMS (78h) to port 80h and halt.
262 ;* Exit: Set fastest CAS Latency based on GeodeLink speed and SPD information.
263 ;* Destroys: We really use everything !
264 ;*****************************************************************************/
265 uint16_t glspeed, dimm_speed;
266 uint8_t spd_byte, casmap0, casmap1, casmap_shift;
269 glspeed = GeodeLinkSpeed();
271 /************************** DIMM0 **********************************/
272 casmap0 = spd_read_byte(DIMM0, SPD_ACCEPTABLE_CAS_LATENCIES);
273 if (casmap0 != 0xFF) {
274 /* IF -.5 timing is supported, check -.5 timing > GeodeLink */
275 spd_byte = spd_read_byte(DIMM0, SPD_SDRAM_CYCLE_TIME_2ND);
277 /* Turn SPD ns time into MHZ. Check what the asm does to this math. */
278 dimm_speed = 20000 / (((spd_byte >> 4) * 10) + (spd_byte & 0x0F));
279 if (dimm_speed >= glspeed) {
280 casmap_shift = 1; /* -.5 is a shift of 1 */
281 /* IF -1 timing is supported, check -1 timing > GeodeLink */
282 spd_byte = spd_read_byte(DIMM0, SPD_SDRAM_CYCLE_TIME_3RD);
284 /* Turn SPD ns time into MHZ. Check what the asm does to this math. */
285 dimm_speed = 20000 / (((spd_byte >> 4) * 10) + (spd_byte & 0x0F));
286 if (dimm_speed >= glspeed) {
287 casmap_shift = 2; /* -1 is a shift of 2 */
289 } /* SPD_SDRAM_CYCLE_TIME_3RD (-1) !=0 */
293 } /* SPD_SDRAM_CYCLE_TIME_2ND (-.5) !=0 */
294 /* set the casmap based on the shift to limit possible CAS settings */
295 spd_byte = 31 - __builtin_clz((uint32_t) casmap0);
296 /* just want bits in the lower byte since we have to cast to a 32 */
297 casmap0 &= 0xFF << (spd_byte - casmap_shift);
298 } else { /* No DIMM */
302 /************************** DIMM1 **********************************/
303 casmap1 = spd_read_byte(DIMM1, SPD_ACCEPTABLE_CAS_LATENCIES);
304 if (casmap1 != 0xFF) {
305 /* IF -.5 timing is supported, check -.5 timing > GeodeLink */
306 spd_byte = spd_read_byte(DIMM1, SPD_SDRAM_CYCLE_TIME_2ND);
308 /* Turn SPD ns time into MHZ. Check what the asm does to this math. */
309 dimm_speed = 20000 / (((spd_byte >> 4) * 10) + (spd_byte & 0x0F));
310 if (dimm_speed >= glspeed) {
311 casmap_shift = 1; /* -.5 is a shift of 1 */
312 /* IF -1 timing is supported, check -1 timing > GeodeLink */
313 spd_byte = spd_read_byte(DIMM1, SPD_SDRAM_CYCLE_TIME_3RD);
315 /* Turn SPD ns time into MHZ. Check what the asm does to this math. */
316 dimm_speed = 20000 / (((spd_byte >> 4) * 10) + (spd_byte & 0x0F));
317 if (dimm_speed >= glspeed) {
318 casmap_shift = 2; /* -1 is a shift of 2 */
320 /* note that the -1 result doesn't need to change the available CAS map */
321 } /* SPD_SDRAM_CYCLE_TIME_3RD (-1) !=0 */
325 } /* SPD_SDRAM_CYCLE_TIME_2ND (-.5) !=0 */
326 /* set the casmap based on the shift to limit possible CAS settings */
327 spd_byte = 31 - __builtin_clz((uint32_t) casmap1);
328 /* just want bits in the lower byte since we have to cast to a 32 */
329 casmap1 &= 0xFF << (spd_byte - casmap_shift);
330 } else { /* No DIMM */
334 /********************* CAS_LAT MAP COMPARE ***************************/
336 spd_byte = CASDDR[__builtin_ctz((uint32_t) casmap1)];
337 } else if (casmap1 == 0) {
338 spd_byte = CASDDR[__builtin_ctz((uint32_t) casmap0)];
339 } else if ((casmap0 &= casmap1)) {
340 spd_byte = CASDDR[__builtin_ctz((uint32_t) casmap0)];
342 print_emerg("DIMM CAS Latencies not compatible\r\n");
343 POST_CODE(ERROR_DIFF_DIMMS);
347 msr = rdmsr(MC_CF8F_DATA);
348 msr.lo &= ~(7 << CF8F_LOWER_CAS_LAT_SHIFT);
349 msr.lo |= spd_byte << CF8F_LOWER_CAS_LAT_SHIFT;
350 wrmsr(MC_CF8F_DATA, msr);
353 static void set_latencies(void)
355 uint32_t memspeed, dimm_setting;
356 uint8_t spd_byte0, spd_byte1;
359 memspeed = GeodeLinkSpeed() / 2;
364 spd_byte0 = spd_read_byte(DIMM0, SPD_tRAS);
365 if (spd_byte0 == 0xFF) {
368 spd_byte1 = spd_read_byte(DIMM1, SPD_tRAS);
369 if (spd_byte1 == 0xFF) {
372 if (spd_byte0 < spd_byte1) {
373 spd_byte0 = spd_byte1;
376 /* (ns/(1/MHz) = (us*MHZ)/1000 = clocks/1000 = clocks) */
377 spd_byte1 = (spd_byte0 * memspeed) / 1000;
378 if (((spd_byte0 * memspeed) % 1000)) {
381 dimm_setting |= spd_byte1 << CF8F_LOWER_ACT2PRE_SHIFT;
384 spd_byte0 = spd_read_byte(DIMM0, SPD_tRP);
385 if (spd_byte0 == 0xFF) {
388 spd_byte1 = spd_read_byte(DIMM1, SPD_tRP);
389 if (spd_byte1 == 0xFF) {
392 if (spd_byte0 < spd_byte1) {
393 spd_byte0 = spd_byte1;
396 /* (ns/(1/MHz) = (us*MHZ)/1000 = clocks/1000 = clocks) */
397 spd_byte1 = ((spd_byte0 >> 2) * memspeed) / 1000;
398 if ((((spd_byte0 >> 2) * memspeed) % 1000)) {
401 dimm_setting |= spd_byte1 << CF8F_LOWER_PRE2ACT_SHIFT;
404 spd_byte0 = spd_read_byte(DIMM0, SPD_tRCD);
405 if (spd_byte0 == 0xFF) {
408 spd_byte1 = spd_read_byte(DIMM1, SPD_tRCD);
409 if (spd_byte1 == 0xFF) {
412 if (spd_byte0 < spd_byte1) {
413 spd_byte0 = spd_byte1;
416 /* (ns/(1/MHz) = (us*MHZ)/1000 = clocks/1000 = clocks) */
417 spd_byte1 = ((spd_byte0 >> 2) * memspeed) / 1000;
418 if ((((spd_byte0 >> 2) * memspeed) % 1000)) {
421 dimm_setting |= spd_byte1 << CF8F_LOWER_ACT2CMD_SHIFT;
424 spd_byte0 = spd_read_byte(DIMM0, SPD_tRRD);
425 if (spd_byte0 == 0xFF) {
428 spd_byte1 = spd_read_byte(DIMM1, SPD_tRRD);
429 if (spd_byte1 == 0xFF) {
432 if (spd_byte0 < spd_byte1) {
433 spd_byte0 = spd_byte1;
436 /* (ns/(1/MHz) = (us*MHZ)/1000 = clocks/1000 = clocks) */
437 spd_byte1 = ((spd_byte0 >> 2) * memspeed) / 1000;
438 if ((((spd_byte0 >> 2) * memspeed) % 1000)) {
441 dimm_setting |= spd_byte1 << CF8F_LOWER_ACT2ACT_SHIFT;
443 /* tRC = tRP + tRAS */
444 dimm_setting |= (((dimm_setting >> CF8F_LOWER_ACT2PRE_SHIFT) & 0x0F) +
445 ((dimm_setting >> CF8F_LOWER_PRE2ACT_SHIFT) & 0x07))
446 << CF8F_LOWER_ACT2ACTREF_SHIFT;
448 msr = rdmsr(MC_CF8F_DATA);
449 msr.lo &= 0xF00000FF;
450 msr.lo |= dimm_setting;
451 msr.hi |= CF8F_UPPER_REORDER_DIS_SET;
452 wrmsr(MC_CF8F_DATA, msr);
454 /* MC_CF1017 setup */
456 spd_byte0 = spd_read_byte(DIMM0, SPD_tRFC);
457 if (spd_byte0 == 0xFF) {
460 spd_byte1 = spd_read_byte(DIMM1, SPD_tRFC);
461 if (spd_byte1 == 0xFF) {
464 if (spd_byte0 < spd_byte1) {
465 spd_byte0 = spd_byte1;
469 /* (ns/(1/MHz) = (us*MHZ)/1000 = clocks/1000 = clocks) */
470 spd_byte1 = (spd_byte0 * memspeed) / 1000;
471 if (((spd_byte0 * memspeed) % 1000)) {
474 } else { /* Not all SPDs have tRFC setting. Use this formula tRFC = tRC + 1 clk */
475 spd_byte1 = ((dimm_setting >> CF8F_LOWER_ACT2ACTREF_SHIFT) & 0x0F) + 1;
477 dimm_setting = spd_byte1 << CF1017_LOWER_REF2ACT_SHIFT; /* note this clears the cf8f dimm setting */
478 msr = rdmsr(MC_CF1017_DATA);
479 msr.lo &= ~(0x1F << CF1017_LOWER_REF2ACT_SHIFT);
480 msr.lo |= dimm_setting;
481 wrmsr(MC_CF1017_DATA, msr);
483 /* tWTR: Set tWTR to 2 for 400MHz and above GLBUS (200Mhz mem) other wise it stay default(1) */
484 if (memspeed > 198) {
485 msr = rdmsr(MC_CF1017_DATA);
486 msr.lo &= ~(0x7 << CF1017_LOWER_WR_TO_RD_SHIFT);
487 msr.lo |= 2 << CF1017_LOWER_WR_TO_RD_SHIFT;
488 wrmsr(MC_CF1017_DATA, msr);
492 static void set_extended_mode_registers(void)
494 uint8_t spd_byte0, spd_byte1;
496 spd_byte0 = spd_read_byte(DIMM0, SPD_DEVICE_ATTRIBUTES_GENERAL);
497 if (spd_byte0 == 0xFF) {
500 spd_byte1 = spd_read_byte(DIMM1, SPD_DEVICE_ATTRIBUTES_GENERAL);
501 if (spd_byte1 == 0xFF) {
504 spd_byte1 &= spd_byte0;
506 msr = rdmsr(MC_CF07_DATA);
507 if (spd_byte1 & 1) { /* Drive Strength Control */
508 msr.lo |= CF07_LOWER_EMR_DRV_SET;
510 if (spd_byte1 & 2) { /* FET Control */
511 msr.lo |= CF07_LOWER_EMR_QFC_SET;
513 wrmsr(MC_CF07_DATA, msr);
516 static void EnableMTest(void)
520 msr = rdmsr(GLCP_DELAY_CONTROLS);
521 msr.hi &= ~(7 << 20); /* clear bits 54:52 */
522 if (GeodeLinkSpeed() < 200) {
525 wrmsr(GLCP_DELAY_CONTROLS, msr);
527 msr = rdmsr(MC_CFCLK_DBUG);
529 CFCLK_UPPER_MTST_B2B_DIS_SET | CFCLK_UPPER_MTEST_EN_SET |
530 CFCLK_UPPER_MTST_RBEX_EN_SET;
531 msr.lo |= CFCLK_LOWER_TRISTATE_DIS_SET;
532 wrmsr(MC_CFCLK_DBUG, msr);
534 print_info("Enabled MTest for TLA debug\r\n");
537 static void sdram_set_registers(const struct mem_controller *ctrl)
542 /* Set Timing Control */
543 msrnum = MC_CF1017_DATA;
545 msr.lo &= ~(7 << CF1017_LOWER_RD_TMG_CTL_SHIFT);
546 if (GeodeLinkSpeed() < 334) {
547 msr.lo |= (3 << CF1017_LOWER_RD_TMG_CTL_SHIFT);
549 msr.lo |= (4 << CF1017_LOWER_RD_TMG_CTL_SHIFT);
553 /* Set Refresh Staggering */
554 msrnum = MC_CF07_DATA;
557 msr.lo |= 0x40; /* set refresh to 4SDRAM clocks */
560 /* Memory Interleave: Set HOI here otherwise default is LOI */
561 /* msrnum = MC_CF8F_DATA;
563 msr.hi |= CF8F_UPPER_HOI_LOI_SET;
564 wrmsr(msrnum, msr); */
567 static void sdram_set_spd_registers(const struct mem_controller *ctrl)
571 banner("sdram_set_spd_register\n");
572 POST_CODE(POST_MEM_SETUP); // post_70h
574 spd_byte = spd_read_byte(DIMM0, SPD_MODULE_ATTRIBUTES);
575 banner("Check DIMM 0");
576 /* Check DIMM is not Register and not Buffered DIMMs. */
577 if ((spd_byte != 0xFF) && (spd_byte & 3)) {
578 print_emerg("DIMM0 NOT COMPATIBLE\r\n");
579 POST_CODE(ERROR_UNSUPPORTED_DIMM);
582 banner("Check DIMM 1");
583 spd_byte = spd_read_byte(DIMM1, SPD_MODULE_ATTRIBUTES);
584 if ((spd_byte != 0xFF) && (spd_byte & 3)) {
585 print_emerg("DIMM1 NOT COMPATIBLE\n");
586 POST_CODE(ERROR_UNSUPPORTED_DIMM);
590 POST_CODE(POST_MEM_SETUP2); // post_72h
591 banner("Check DDR MAX");
593 /* Check that the memory is not overclocked. */
597 POST_CODE(POST_MEM_SETUP3); // post_73h
598 banner("AUTOSIZE DIMM 0");
599 auto_size_dimm(DIMM0);
600 POST_CODE(POST_MEM_SETUP4); // post_74h
601 banner("AUTOSIZE DIMM 1");
602 auto_size_dimm(DIMM1);
604 /* Set CAS latency */
605 banner("set cas latency");
606 POST_CODE(POST_MEM_SETUP5); // post_75h
609 /* Set all the other latencies here (tRAS, tRP....) */
610 banner("set all latency");
613 /* Set Extended Mode Registers */
615 set_extended_mode_registers();
617 banner("set ref rate");
618 /* Set Memory Refresh Rate */
623 /* Section 6.1.3, LX processor databooks, BIOS Initialization Sequence
624 * Section 4.1.4, GX/CS5535 GeodeROM Porting guide */
625 static void sdram_enable(int controllers, const struct mem_controller *ctrl)
630 /*********************************************************************
631 ;* Turn on MC/DIMM interface per JEDEC
632 ;* 1) Clock stabilizes > 200us
634 ;* 3) Precharge All to put all banks into an idles state
635 ;* 4) EMRS to enable DLL
636 ;* 6) MRS w/ memory config & reset DLL set
637 ;* 7) Wait 200 clocks (2us)
638 ;* 8) Precharge All and 2 Auto refresh
639 ;* 9) MRS w/ memory config & reset DLL clear
640 ;* 8) DDR SDRAM ready for normal operation
641 ;********************************************************************/
642 POST_CODE(POST_MEM_ENABLE); // post_76h
644 /* Only enable MTest for TLA memory debug */
647 /* If both Page Size = "Not Installed" we have a problems and should halt. */
648 msr = rdmsr(MC_CF07_DATA);
649 if ((msr.hi & ((7 << CF07_UPPER_D1_PSZ_SHIFT) | (7 << CF07_UPPER_D0_PSZ_SHIFT))) ==
650 ((7 << CF07_UPPER_D1_PSZ_SHIFT) | (7 << CF07_UPPER_D0_PSZ_SHIFT))) {
651 print_emerg("No memory in the system\r\n");
652 POST_CODE(ERROR_NO_DIMMS);
657 msrnum = MC_CFCLK_DBUG;
659 msr.lo &= ~(CFCLK_LOWER_MASK_CKE_SET0 | CFCLK_LOWER_MASK_CKE_SET1);
662 /* Force Precharge All on next command, EMRS */
663 msrnum = MC_CFCLK_DBUG;
665 msr.lo |= CFCLK_LOWER_FORCE_PRE_SET;
668 /* EMRS to enable DLL (pre-setup done in setExtendedModeRegisters) */
669 msrnum = MC_CF07_DATA;
671 msr.lo |= CF07_LOWER_PROG_DRAM_SET | CF07_LOWER_LOAD_MODE_DDR_SET;
673 msr.lo &= ~(CF07_LOWER_PROG_DRAM_SET | CF07_LOWER_LOAD_MODE_DDR_SET);
676 /* Clear Force Precharge All */
677 msrnum = MC_CFCLK_DBUG;
679 msr.lo &= ~CFCLK_LOWER_FORCE_PRE_SET;
682 /* MRS Reset DLL - set */
683 msrnum = MC_CF07_DATA;
685 msr.lo |= CF07_LOWER_PROG_DRAM_SET | CF07_LOWER_LOAD_MODE_DLL_RESET;
687 msr.lo &= ~(CF07_LOWER_PROG_DRAM_SET | CF07_LOWER_LOAD_MODE_DLL_RESET);
690 /* 2us delay (200 clocks @ 200Mhz). We probably really don't need this but.... better safe. */
691 /* Wait 2 PORT61 ticks. between 15us and 30us */
692 /* This would be endless if the timer is stuck. */
693 while ((inb(0x61))) ; /* find the first edge */
694 while (!(~inb(0x61))) ;
696 /* Force Precharge All on the next command, auto-refresh */
697 msrnum = MC_CFCLK_DBUG;
699 msr.lo |= CFCLK_LOWER_FORCE_PRE_SET;
702 /* Manually AUTO refresh #1 */
703 /* If auto refresh was not enabled above we would need to do 8 refreshes to prime the pump before these 2. */
704 msrnum = MC_CF07_DATA;
706 msr.lo |= CF07_LOWER_REF_TEST_SET;
708 msr.lo &= ~CF07_LOWER_REF_TEST_SET;
711 /* Clear Force Precharge All */
712 msrnum = MC_CFCLK_DBUG;
714 msr.lo &= ~CFCLK_LOWER_FORCE_PRE_SET;
717 /* Manually AUTO refresh */
718 /* The MC should insert the right delay between the refreshes */
719 msrnum = MC_CF07_DATA;
721 msr.lo |= CF07_LOWER_REF_TEST_SET;
723 msr.lo &= ~CF07_LOWER_REF_TEST_SET;
726 /* MRS Reset DLL - clear */
727 msrnum = MC_CF07_DATA;
729 msr.lo |= CF07_LOWER_PROG_DRAM_SET;
731 msr.lo &= ~CF07_LOWER_PROG_DRAM_SET;
734 /* Allow MC to tristate during idle cycles with MTEST OFF */
735 msrnum = MC_CFCLK_DBUG;
737 msr.lo &= ~CFCLK_LOWER_TRISTATE_DIS_SET;
740 /* Disable SDCLK DIMM1 slot if no DIMM installed to save power. */
741 msr = rdmsr(MC_CF07_DATA);
742 if ((msr.hi & (7 << CF07_UPPER_D1_PSZ_SHIFT)) ==
743 (7 << CF07_UPPER_D1_PSZ_SHIFT)) {
744 msrnum = GLCP_DELAY_CONTROLS;
746 msr.hi |= (1 << 23); /* SDCLK bit for 2.0 */
750 /* Set PMode0 Sensitivity Counter */
751 msr.lo = 0; /* pmode 0=0 most aggressive */
752 msr.hi = 0x200; /* pmode 1=200h */
753 wrmsr(MC_CF_PMCTR, msr);
755 /* Set PMode1 Up delay enable */
756 msrnum = MC_CF1017_DATA;
758 msr.lo |= (209 << 8); /* bits[15:8] = 209 */
761 print_emerg("DRAM controller init done.\n");
762 POST_CODE(POST_MEM_SETUP_GOOD); //0x7E
764 /* make sure there is nothing stale in the cache */
765 /* CAR stack is in the cache __asm__ __volatile__("wbinvd\n"); */
767 /* The RAM dll needs a write to lock on so generate a few dummy writes */
768 /* Note: The descriptor needs to be enabled to point at memory */
769 volatile unsigned long *ptr;
770 for (i = 0; i < 5; i++) {
772 *ptr = (unsigned long)i;
774 /* SWAPSiF for PBZ 4112 (Errata 34) */
775 /* check for failed DLL settings now that we have done a memory write. */
776 msrnum = GLCP_DELAY_CONTROLS;
778 if ((msr.lo & 0x7FF) == 0x104) {
780 /* If you had it you would need to clear out the fail boot count flag */
781 /* (depending on where it counts from etc). */
783 /* The reset we are about to perform clears the PM_SSC register in the */
784 /* 5536 so will need to store the S3 resume flag in NVRAM otherwise */
785 /* it would do a normal boot */
787 /* Reset the system */
788 msrnum = MDD_SOFT_RESET;
793 print_info("RAM DLL lock\n");