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 static void banner(const char *s)
32 printk(BIOS_DEBUG, " * %s\n", s);
35 static void __attribute__((noreturn)) hcf(void)
38 /* this guarantees we flush the UART fifos (if any) and also
39 * ensures that things, in general, keep going so no debug output
46 static void auto_size_dimm(unsigned int dimm)
48 uint32_t dimm_setting;
55 banner("Check present");
56 /* Check that we have a dimm */
57 if (spd_read_byte(dimm, SPD_MEMORY_TYPE) == 0xFF) {
62 /* Field: Module Banks per DIMM */
63 /* EEPROM byte usage: (5) Number of DIMM Banks */
64 spd_byte = spd_read_byte(dimm, SPD_NUM_DIMM_BANKS);
65 if ((MIN_MOD_BANKS > spd_byte) || (spd_byte > MAX_MOD_BANKS)) {
66 print_emerg("Number of module banks not compatible\n");
67 post_code(ERROR_BANK_SET);
70 dimm_setting |= (spd_byte >> 1) << CF07_UPPER_D0_MB_SHIFT;
73 /* Field: Banks per SDRAM device */
74 /* EEPROM byte usage: (17) Number of Banks on SDRAM Device */
75 spd_byte = spd_read_byte(dimm, SPD_NUM_BANKS_PER_SDRAM);
76 if ((MIN_DEV_BANKS > spd_byte) || (spd_byte > MAX_DEV_BANKS)) {
77 print_emerg("Number of device banks not compatible\n");
78 post_code(ERROR_BANK_SET);
81 dimm_setting |= (spd_byte >> 2) << CF07_UPPER_D0_CB_SHIFT;
85 *; EEPROM byte usage: (3) Number of Row Addresses
86 *; (4) Number of Column Addresses
87 *; (5) Number of DIMM Banks
88 *; (31) Module Bank Density
89 *; Size = Module Density * Module Banks
91 if ((spd_read_byte(dimm, SPD_NUM_ROWS) & 0xF0)
92 || (spd_read_byte(dimm, SPD_NUM_COLUMNS) & 0xF0)) {
93 print_emerg("Assymetirc DIMM not compatible\n");
94 post_code(ERROR_UNSUPPORTED_DIMM);
97 banner("SPDBANKDENSITY");
99 dimm_size = spd_read_byte(dimm, SPD_BANK_DENSITY);
101 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 */
102 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 */
104 /* Module Density * Module Banks */
105 dimm_size <<= (dimm_setting >> CF07_UPPER_D0_MB_SHIFT) & 1; /* shift to multiply by # DIMM banks */
106 banner("BEFORT CTZ");
107 dimm_size = __builtin_ctz(dimm_size);
108 banner("TEST DIMM SIZE>8");
109 if (dimm_size > 8) { /* 8 is 1GB only support 1GB per DIMM */
110 print_emerg("Only support up to 1 GB per DIMM\n");
111 post_code(ERROR_DENSITY_DIMM);
114 dimm_setting |= dimm_size << CF07_UPPER_D0_SZ_SHIFT;
118 *; EEPROM byte usage: (4) Number of Column Addresses
119 *; PageSize = 2^# Column Addresses * Data width in bytes (should be 8bytes for a normal DIMM)
121 *; But this really works by magic.
122 *;If ma[12:0] is the memory address pins, and pa[12:0] is the physical column address
123 *;that MC generates, here is how the MC assigns the pa onto the ma pins:
125 *;ma 12 11 10 09 08 07 06 05 04 03 02 01 00
126 *;-------------------------------------------
127 *;pa 09 08 07 06 05 04 03 (7 col addr bits = 1K page size)
128 *;pa 10 09 08 07 06 05 04 03 (8 col addr bits = 2K page size)
129 *;pa 11 10 09 08 07 06 05 04 03 (9 col addr bits = 4K page size)
130 *;pa 12 11 10 09 08 07 06 05 04 03 (10 col addr bits = 8K page size)
131 *;pa 13 AP 12 11 10 09 08 07 06 05 04 03 (11 col addr bits = 16K page size)
132 *;pa 14 13 AP 12 11 10 09 08 07 06 05 04 03 (12 col addr bits = 32K page size)
133 *; *AP=autoprecharge bit
135 *;Remember that pa[2:0] are zeroed out since it's a 64-bit data bus (8 bytes),
136 *;so lower 3 address bits are dont_cares.So from the table above,
137 *;it's easier to see what the old code is doing: if for example,#col_addr_bits=7(06h),
138 *;it adds 3 to get 10, then does 2^10=1K. Get it?*/
140 spd_byte = NumColAddr[spd_read_byte(dimm, SPD_NUM_COLUMNS) & 0xF];
141 banner("MAXCOLADDR");
142 if (spd_byte > MAX_COL_ADDR) {
143 print_emerg("DIMM page size not compatible\n");
144 post_code(ERROR_SET_PAGE);
147 banner(">12address test");
149 if (spd_byte > 5) { /* if the value is above 6 it means >12 address lines */
150 spd_byte = 7; /* which means >32k so set to disabled */
152 dimm_setting |= spd_byte << CF07_UPPER_D0_PSZ_SHIFT; /* 0=1k,1=2k,2=4k,etc */
154 banner("RDMSR CF07");
155 msr = rdmsr(MC_CF07_DATA);
156 banner("WRMSR CF07");
158 msr.hi &= 0xFFFF0000;
159 msr.hi |= dimm_setting;
161 msr.hi &= 0x0000FFFF;
162 msr.hi |= dimm_setting << 16;
164 wrmsr(MC_CF07_DATA, msr);
168 static void checkDDRMax(void)
170 uint8_t spd_byte0, spd_byte1;
173 /* PC133 identifier */
174 spd_byte0 = spd_read_byte(DIMM0, SPD_MIN_CYCLE_TIME_AT_CAS_MAX);
175 if (spd_byte0 == 0xFF) {
178 spd_byte1 = spd_read_byte(DIMM1, SPD_MIN_CYCLE_TIME_AT_CAS_MAX);
179 if (spd_byte1 == 0xFF) {
183 /* I don't think you need this check.
184 if (spd_byte0 >= 0xA0 || spd_byte1 >= 0xA0){
185 print_emerg("DIMM overclocked. Check GeodeLink Speed\n");
186 post_code(POST_PLL_MEM_FAIL);
190 /* Use the slowest DIMM */
191 if (spd_byte0 < spd_byte1) {
192 spd_byte0 = spd_byte1;
195 /* Turn SPD ns time into MHZ. Check what the asm does to this math. */
196 speed = 20000 / (((spd_byte0 >> 4) * 10) + (spd_byte0 & 0x0F));
198 /* current speed > max speed? */
199 if (GeodeLinkSpeed() > speed) {
200 print_emerg("DIMM overclocked. Check GeodeLink Speed\n");
201 post_code(POST_PLL_MEM_FAIL);
206 const uint16_t REF_RATE[] = { 15, 3, 7, 31, 62, 125 }; /* ns */
208 static void set_refresh_rate(void)
210 uint8_t spd_byte0, spd_byte1;
211 uint16_t rate0, rate1;
214 spd_byte0 = spd_read_byte(DIMM0, SPD_REFRESH);
219 rate0 = REF_RATE[spd_byte0];
221 spd_byte1 = spd_read_byte(DIMM1, SPD_REFRESH);
226 rate1 = REF_RATE[spd_byte1];
228 /* Use the faster rate (lowest number) */
233 msr = rdmsr(MC_CF07_DATA);
234 msr.lo |= ((rate0 * (GeodeLinkSpeed() / 2)) / 16)
235 << CF07_LOWER_REF_INT_SHIFT;
236 wrmsr(MC_CF07_DATA, msr);
239 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 */
241 static u8 getcasmap(u32 dimm, u16 glspeed)
244 u8 spd_byte, casmap, casmap_shift=0;
246 /************************** DIMM0 **********************************/
247 casmap = spd_read_byte(dimm, SPD_ACCEPTABLE_CAS_LATENCIES);
248 if (casmap != 0xFF) {
249 /* IF -.5 timing is supported, check -.5 timing > GeodeLink */
250 spd_byte = spd_read_byte(dimm, SPD_SDRAM_CYCLE_TIME_2ND);
252 /* Turn SPD ns time into MHZ. Check what the asm does to this math. */
253 dimm_speed = 20000 / (((spd_byte >> 4) * 10) + (spd_byte & 0x0F));
254 if (dimm_speed >= glspeed) {
255 casmap_shift = 1; /* -.5 is a shift of 1 */
256 /* IF -1 timing is supported, check -1 timing > GeodeLink */
257 spd_byte = spd_read_byte(dimm, SPD_SDRAM_CYCLE_TIME_3RD);
259 /* Turn SPD ns time into MHZ. Check what the asm does to this math. */
260 dimm_speed = 20000 / (((spd_byte >> 4) * 10) + (spd_byte & 0x0F));
261 if (dimm_speed >= glspeed) {
262 casmap_shift = 2; /* -1 is a shift of 2 */
264 } /* SPD_SDRAM_CYCLE_TIME_3RD (-1) !=0 */
268 } /* SPD_SDRAM_CYCLE_TIME_2ND (-.5) !=0 */
269 /* set the casmap based on the shift to limit possible CAS settings */
270 spd_byte = 31 - __builtin_clz((uint32_t) casmap);
271 /* just want bits in the lower byte since we have to cast to a 32 */
272 casmap &= 0xFF << (spd_byte - casmap_shift);
273 } else { /* No DIMM */
279 static void setCAS(void)
281 /*;*****************************************************************************
284 ;* EEPROM byte usage: (18) SDRAM device attributes - CAS latency
285 ;* EEPROM byte usage: (23) SDRAM Minimum Clock Cycle Time @ CLX -.5
286 ;* EEPROM byte usage: (25) SDRAM Minimum Clock Cycle Time @ CLX -1
288 ;* The CAS setting is based on the information provided in each DIMMs SPD.
289 ;* The speed at which a DIMM can run is described relative to the slowest
290 ;* CAS the DIMM supports. Each speed for the relative CAS settings is
291 ;* checked that it is within the GeodeLink speed. If it isn't within the GeodeLink
292 ;* speed, the CAS setting is removed from the list of good settings for
293 ;* the DIMM. This is done for both DIMMs and the lists are compared to
294 ;* find the lowest common CAS latency setting. If there are no CAS settings
295 ;* in common we out a ERROR_DIFF_DIMMS (78h) to port 80h and halt.
298 ;* Exit: Set fastest CAS Latency based on GeodeLink speed and SPD information.
299 ;* Destroys: We really use everything !
300 ;*****************************************************************************/
302 uint8_t spd_byte, casmap0, casmap1;
305 glspeed = GeodeLinkSpeed();
307 casmap0 = getcasmap(DIMM0, glspeed);
308 casmap1 = getcasmap(DIMM1, glspeed);
310 /********************* CAS_LAT MAP COMPARE ***************************/
312 spd_byte = CASDDR[__builtin_ctz(casmap1)];
313 } else if (casmap1 == 0) {
314 spd_byte = CASDDR[__builtin_ctz(casmap0)];
315 } else if ((casmap0 &= casmap1)) {
316 spd_byte = CASDDR[__builtin_ctz(casmap0)];
318 print_emerg("DIMM CAS Latencies not compatible\n");
319 post_code(ERROR_DIFF_DIMMS);
323 msr = rdmsr(MC_CF8F_DATA);
324 msr.lo &= ~(7 << CF8F_LOWER_CAS_LAT_SHIFT);
325 msr.lo |= spd_byte << CF8F_LOWER_CAS_LAT_SHIFT;
326 wrmsr(MC_CF8F_DATA, msr);
329 static void set_latencies(void)
331 uint32_t memspeed, dimm_setting;
332 uint8_t spd_byte0, spd_byte1;
335 memspeed = GeodeLinkSpeed() / 2;
340 spd_byte0 = spd_read_byte(DIMM0, SPD_tRAS);
341 if (spd_byte0 == 0xFF) {
344 spd_byte1 = spd_read_byte(DIMM1, SPD_tRAS);
345 if (spd_byte1 == 0xFF) {
348 if (spd_byte0 < spd_byte1) {
349 spd_byte0 = spd_byte1;
352 /* (ns/(1/MHz) = (us*MHZ)/1000 = clocks/1000 = clocks) */
353 spd_byte1 = (spd_byte0 * memspeed) / 1000;
354 if (((spd_byte0 * memspeed) % 1000)) {
357 dimm_setting |= spd_byte1 << CF8F_LOWER_ACT2PRE_SHIFT;
360 spd_byte0 = spd_read_byte(DIMM0, SPD_tRP);
361 if (spd_byte0 == 0xFF) {
364 spd_byte1 = spd_read_byte(DIMM1, SPD_tRP);
365 if (spd_byte1 == 0xFF) {
368 if (spd_byte0 < spd_byte1) {
369 spd_byte0 = spd_byte1;
372 /* (ns/(1/MHz) = (us*MHZ)/1000 = clocks/1000 = clocks) */
373 spd_byte1 = ((spd_byte0 >> 2) * memspeed) / 1000;
374 if ((((spd_byte0 >> 2) * memspeed) % 1000)) {
377 dimm_setting |= spd_byte1 << CF8F_LOWER_PRE2ACT_SHIFT;
380 spd_byte0 = spd_read_byte(DIMM0, SPD_tRCD);
381 if (spd_byte0 == 0xFF) {
384 spd_byte1 = spd_read_byte(DIMM1, SPD_tRCD);
385 if (spd_byte1 == 0xFF) {
388 if (spd_byte0 < spd_byte1) {
389 spd_byte0 = spd_byte1;
392 /* (ns/(1/MHz) = (us*MHZ)/1000 = clocks/1000 = clocks) */
393 spd_byte1 = ((spd_byte0 >> 2) * memspeed) / 1000;
394 if ((((spd_byte0 >> 2) * memspeed) % 1000)) {
397 dimm_setting |= spd_byte1 << CF8F_LOWER_ACT2CMD_SHIFT;
400 spd_byte0 = spd_read_byte(DIMM0, SPD_tRRD);
401 if (spd_byte0 == 0xFF) {
404 spd_byte1 = spd_read_byte(DIMM1, SPD_tRRD);
405 if (spd_byte1 == 0xFF) {
408 if (spd_byte0 < spd_byte1) {
409 spd_byte0 = spd_byte1;
412 /* (ns/(1/MHz) = (us*MHZ)/1000 = clocks/1000 = clocks) */
413 spd_byte1 = ((spd_byte0 >> 2) * memspeed) / 1000;
414 if ((((spd_byte0 >> 2) * memspeed) % 1000)) {
417 dimm_setting |= spd_byte1 << CF8F_LOWER_ACT2ACT_SHIFT;
419 /* tRC = tRP + tRAS */
420 dimm_setting |= (((dimm_setting >> CF8F_LOWER_ACT2PRE_SHIFT) & 0x0F) +
421 ((dimm_setting >> CF8F_LOWER_PRE2ACT_SHIFT) & 0x07))
422 << CF8F_LOWER_ACT2ACTREF_SHIFT;
424 msr = rdmsr(MC_CF8F_DATA);
425 msr.lo &= 0xF00000FF;
426 msr.lo |= dimm_setting;
427 msr.hi |= CF8F_UPPER_REORDER_DIS_SET;
428 wrmsr(MC_CF8F_DATA, msr);
430 /* MC_CF1017 setup */
432 spd_byte0 = spd_read_byte(DIMM0, SPD_tRFC);
433 if (spd_byte0 == 0xFF) {
436 spd_byte1 = spd_read_byte(DIMM1, SPD_tRFC);
437 if (spd_byte1 == 0xFF) {
440 if (spd_byte0 < spd_byte1) {
441 spd_byte0 = spd_byte1;
445 /* (ns/(1/MHz) = (us*MHZ)/1000 = clocks/1000 = clocks) */
446 spd_byte1 = (spd_byte0 * memspeed) / 1000;
447 if (((spd_byte0 * memspeed) % 1000)) {
450 } else { /* Not all SPDs have tRFC setting. Use this formula tRFC = tRC + 1 clk */
451 spd_byte1 = ((dimm_setting >> CF8F_LOWER_ACT2ACTREF_SHIFT) & 0x0F) + 1;
453 dimm_setting = spd_byte1 << CF1017_LOWER_REF2ACT_SHIFT; /* note this clears the cf8f dimm setting */
454 msr = rdmsr(MC_CF1017_DATA);
455 msr.lo &= ~(0x1F << CF1017_LOWER_REF2ACT_SHIFT);
456 msr.lo |= dimm_setting;
457 wrmsr(MC_CF1017_DATA, msr);
459 /* tWTR: Set tWTR to 2 for 400MHz and above GLBUS (200Mhz mem) other wise it stay default(1) */
460 if (memspeed > 198) {
461 msr = rdmsr(MC_CF1017_DATA);
462 msr.lo &= ~(0x7 << CF1017_LOWER_WR_TO_RD_SHIFT);
463 msr.lo |= 2 << CF1017_LOWER_WR_TO_RD_SHIFT;
464 wrmsr(MC_CF1017_DATA, msr);
468 static void set_extended_mode_registers(void)
470 uint8_t spd_byte0, spd_byte1;
472 spd_byte0 = spd_read_byte(DIMM0, SPD_DEVICE_ATTRIBUTES_GENERAL);
473 if (spd_byte0 == 0xFF) {
476 spd_byte1 = spd_read_byte(DIMM1, SPD_DEVICE_ATTRIBUTES_GENERAL);
477 if (spd_byte1 == 0xFF) {
480 spd_byte1 &= spd_byte0;
482 msr = rdmsr(MC_CF07_DATA);
483 if (spd_byte1 & 1) { /* Drive Strength Control */
484 msr.lo |= CF07_LOWER_EMR_DRV_SET;
486 if (spd_byte1 & 2) { /* FET Control */
487 msr.lo |= CF07_LOWER_EMR_QFC_SET;
489 wrmsr(MC_CF07_DATA, msr);
492 #undef TLA_MEMORY_DEBUG
493 #ifdef TLA_MEMORY_DEBUG
494 static void EnableMTest(void)
498 msr = rdmsr(GLCP_DELAY_CONTROLS);
499 msr.hi &= ~(7 << 20); /* clear bits 54:52 */
500 if (GeodeLinkSpeed() < 200) {
503 wrmsr(GLCP_DELAY_CONTROLS, msr);
505 msr = rdmsr(MC_CFCLK_DBUG);
507 CFCLK_UPPER_MTST_B2B_DIS_SET | CFCLK_UPPER_MTEST_EN_SET |
508 CFCLK_UPPER_MTST_RBEX_EN_SET;
509 msr.lo |= CFCLK_LOWER_TRISTATE_DIS_SET;
510 wrmsr(MC_CFCLK_DBUG, msr);
512 print_info("Enabled MTest for TLA debug\n");
516 static void sdram_set_registers(const struct mem_controller *ctrl)
521 /* Set Timing Control */
522 msrnum = MC_CF1017_DATA;
524 msr.lo &= ~(7 << CF1017_LOWER_RD_TMG_CTL_SHIFT);
525 if (GeodeLinkSpeed() < 334) {
526 msr.lo |= (3 << CF1017_LOWER_RD_TMG_CTL_SHIFT);
528 msr.lo |= (4 << CF1017_LOWER_RD_TMG_CTL_SHIFT);
532 /* Set Refresh Staggering */
533 msrnum = MC_CF07_DATA;
536 msr.lo |= 0x40; /* set refresh to 4SDRAM clocks */
539 /* Memory Interleave: Set HOI here otherwise default is LOI */
540 /* msrnum = MC_CF8F_DATA;
542 msr.hi |= CF8F_UPPER_HOI_LOI_SET;
543 wrmsr(msrnum, msr); */
546 static void sdram_set_spd_registers(const struct mem_controller *ctrl)
550 banner("sdram_set_spd_register");
551 post_code(POST_MEM_SETUP); // post_70h
553 spd_byte = spd_read_byte(DIMM0, SPD_MODULE_ATTRIBUTES);
554 banner("Check DIMM 0");
555 /* Check DIMM is not Register and not Buffered DIMMs. */
556 if ((spd_byte != 0xFF) && (spd_byte & 3)) {
557 print_emerg("DIMM0 NOT COMPATIBLE\n");
558 post_code(ERROR_UNSUPPORTED_DIMM);
561 banner("Check DIMM 1");
562 spd_byte = spd_read_byte(DIMM1, SPD_MODULE_ATTRIBUTES);
563 if ((spd_byte != 0xFF) && (spd_byte & 3)) {
564 print_emerg("DIMM1 NOT COMPATIBLE\n");
565 post_code(ERROR_UNSUPPORTED_DIMM);
569 post_code(POST_MEM_SETUP2); // post_72h
570 banner("Check DDR MAX");
572 /* Check that the memory is not overclocked. */
576 post_code(POST_MEM_SETUP3); // post_73h
577 banner("AUTOSIZE DIMM 0");
578 auto_size_dimm(DIMM0);
579 post_code(POST_MEM_SETUP4); // post_74h
580 banner("AUTOSIZE DIMM 1");
581 auto_size_dimm(DIMM1);
583 /* Set CAS latency */
584 banner("set cas latency");
585 post_code(POST_MEM_SETUP5); // post_75h
588 /* Set all the other latencies here (tRAS, tRP....) */
589 banner("set all latency");
592 /* Set Extended Mode Registers */
594 set_extended_mode_registers();
596 banner("set ref rate");
597 /* Set Memory Refresh Rate */
602 /* Section 6.1.3, LX processor databooks, BIOS Initialization Sequence
603 * Section 4.1.4, GX/CS5535 GeodeROM Porting guide */
604 static void sdram_enable(int controllers, const struct mem_controller *ctrl)
609 /*********************************************************************
610 ;* Turn on MC/DIMM interface per JEDEC
611 ;* 1) Clock stabilizes > 200us
613 ;* 3) Precharge All to put all banks into an idles state
614 ;* 4) EMRS to enable DLL
615 ;* 6) MRS w/ memory config & reset DLL set
616 ;* 7) Wait 200 clocks (2us)
617 ;* 8) Precharge All and 2 Auto refresh
618 ;* 9) MRS w/ memory config & reset DLL clear
619 ;* 8) DDR SDRAM ready for normal operation
620 ;********************************************************************/
621 post_code(POST_MEM_ENABLE); // post_76h
623 #ifdef TLA_MEMORY_DEBUG
624 /* Only enable MTest for TLA memory debug */
628 /* If both Page Size = "Not Installed" we have a problems and should halt. */
629 msr = rdmsr(MC_CF07_DATA);
630 if ((msr.hi & ((7 << CF07_UPPER_D1_PSZ_SHIFT) | (7 << CF07_UPPER_D0_PSZ_SHIFT))) ==
631 ((7 << CF07_UPPER_D1_PSZ_SHIFT) | (7 << CF07_UPPER_D0_PSZ_SHIFT))) {
632 print_emerg("No memory in the system\n");
633 post_code(ERROR_NO_DIMMS);
638 msrnum = MC_CFCLK_DBUG;
640 msr.lo &= ~(CFCLK_LOWER_MASK_CKE_SET0 | CFCLK_LOWER_MASK_CKE_SET1);
643 /* Force Precharge All on next command, EMRS */
644 msrnum = MC_CFCLK_DBUG;
646 msr.lo |= CFCLK_LOWER_FORCE_PRE_SET;
649 /* EMRS to enable DLL (pre-setup done in setExtendedModeRegisters) */
650 msrnum = MC_CF07_DATA;
652 msr.lo |= CF07_LOWER_PROG_DRAM_SET | CF07_LOWER_LOAD_MODE_DDR_SET;
654 msr.lo &= ~(CF07_LOWER_PROG_DRAM_SET | CF07_LOWER_LOAD_MODE_DDR_SET);
657 /* Clear Force Precharge All */
658 msrnum = MC_CFCLK_DBUG;
660 msr.lo &= ~CFCLK_LOWER_FORCE_PRE_SET;
663 /* MRS Reset DLL - set */
664 msrnum = MC_CF07_DATA;
666 msr.lo |= CF07_LOWER_PROG_DRAM_SET | CF07_LOWER_LOAD_MODE_DLL_RESET;
668 msr.lo &= ~(CF07_LOWER_PROG_DRAM_SET | CF07_LOWER_LOAD_MODE_DLL_RESET);
671 /* 2us delay (200 clocks @ 200Mhz). We probably really don't need this but.... better safe. */
672 /* Wait 2 PORT61 ticks. between 15us and 30us */
673 /* This would be endless if the timer is stuck. */
674 while ((inb(0x61))) ; /* find the first edge */
675 while (!(~inb(0x61))) ;
677 /* Force Precharge All on the next command, auto-refresh */
678 msrnum = MC_CFCLK_DBUG;
680 msr.lo |= CFCLK_LOWER_FORCE_PRE_SET;
683 /* Manually AUTO refresh #1 */
684 /* If auto refresh was not enabled above we would need to do 8 refreshes to prime the pump before these 2. */
685 msrnum = MC_CF07_DATA;
687 msr.lo |= CF07_LOWER_REF_TEST_SET;
689 msr.lo &= ~CF07_LOWER_REF_TEST_SET;
692 /* Clear Force Precharge All */
693 msrnum = MC_CFCLK_DBUG;
695 msr.lo &= ~CFCLK_LOWER_FORCE_PRE_SET;
698 /* Manually AUTO refresh */
699 /* The MC should insert the right delay between the refreshes */
700 msrnum = MC_CF07_DATA;
702 msr.lo |= CF07_LOWER_REF_TEST_SET;
704 msr.lo &= ~CF07_LOWER_REF_TEST_SET;
707 /* MRS Reset DLL - clear */
708 msrnum = MC_CF07_DATA;
710 msr.lo |= CF07_LOWER_PROG_DRAM_SET;
712 msr.lo &= ~CF07_LOWER_PROG_DRAM_SET;
715 /* Allow MC to tristate during idle cycles with MTEST OFF */
716 msrnum = MC_CFCLK_DBUG;
718 msr.lo &= ~CFCLK_LOWER_TRISTATE_DIS_SET;
721 /* Disable SDCLK DIMM1 slot if no DIMM installed to save power. */
722 msr = rdmsr(MC_CF07_DATA);
723 if ((msr.hi & (7 << CF07_UPPER_D1_PSZ_SHIFT)) ==
724 (7 << CF07_UPPER_D1_PSZ_SHIFT)) {
725 msrnum = GLCP_DELAY_CONTROLS;
727 msr.hi |= (1 << 23); /* SDCLK bit for 2.0 */
731 /* Set PMode0 Sensitivity Counter */
732 msr.lo = 0; /* pmode 0=0 most aggressive */
733 msr.hi = 0x200; /* pmode 1=200h */
734 wrmsr(MC_CF_PMCTR, msr);
736 /* Set PMode1 Up delay enable */
737 msrnum = MC_CF1017_DATA;
739 msr.lo |= (209 << 8); /* bits[15:8] = 209 */
742 banner("DRAM controller init done.\n");
743 post_code(POST_MEM_SETUP_GOOD); //0x7E
745 /* make sure there is nothing stale in the cache */
746 /* CAR stack is in the cache __asm__ __volatile__("wbinvd\n"); */
748 /* The RAM dll needs a write to lock on so generate a few dummy writes */
749 /* Note: The descriptor needs to be enabled to point at memory */
750 volatile unsigned long *ptr;
751 for (i = 0; i < 5; i++) {
753 *ptr = (unsigned long)i;
755 /* SWAPSiF for PBZ 4112 (Errata 34) */
756 /* check for failed DLL settings now that we have done a memory write. */
757 msrnum = GLCP_DELAY_CONTROLS;
759 if ((msr.lo & 0x7FF) == 0x104) {
761 /* If you had it you would need to clear out the fail boot count flag */
762 /* (depending on where it counts from etc). */
764 /* The reset we are about to perform clears the PM_SSC register in the */
765 /* 5536 so will need to store the S3 resume flag in NVRAM otherwise */
766 /* it would do a normal boot */
768 /* Reset the system */
769 msrnum = MDD_SOFT_RESET;
774 print_info("RAM DLL lock\n");