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[people/ms/u-boot.git] / cpu / ppc4xx / spd_sdram.c
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fe8c2806
WD		 1/*
2 * (C) Copyright 2001
3 * Bill Hunter, Wave 7 Optics, williamhunter@attbi.com
4 *
5 * Based on code by:
6 *
7 * Kenneth Johansson ,Ericsson Business Innovation.
8 * kenneth.johansson@inn.ericsson.se
9 *
10 * hacked up by bill hunter. fixed so we could run before
11 * serial_init and console_init. previous version avoided this by
12 * running out of cache memory during serial/console init, then running
13 * this code later.
14 *
15 * (C) Copyright 2002
16 * Jun Gu, Artesyn Technology, jung@artesyncp.com
17 * Support for IBM 440 based on OpenBIOS draminit.c from IBM.
18 *
19 * See file CREDITS for list of people who contributed to this
20 * project.
21 *
22 * This program is free software; you can redistribute it and/or
23 * modify it under the terms of the GNU General Public License as
24 * published by the Free Software Foundation; either version 2 of
25 * the License, or (at your option) any later version.
26 *
27 * This program is distributed in the hope that it will be useful,
28 * but WITHOUT ANY WARRANTY; without even the implied warranty of
29 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
30 * GNU General Public License for more details.
31 *
32 * You should have received a copy of the GNU General Public License
33 * along with this program; if not, write to the Free Software
34 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
35 * MA 02111-1307 USA
36 */
37
38#include <common.h>
39#include <asm/processor.h>
40#include <i2c.h>
41#include <ppc4xx.h>
42
43#ifdef CONFIG_SPD_EEPROM
44
45/*
46 * Set default values
47 */
48#ifndef CFG_I2C_SPEED
49#define CFG_I2C_SPEED 50000
50#endif
51
52#ifndef CFG_I2C_SLAVE
53#define CFG_I2C_SLAVE 0xFE
54#endif
55
56#ifndef CONFIG_440 /* for 405 WALNUT board */
57
58#define SDRAM0_CFG_DCE 0x80000000
59#define SDRAM0_CFG_SRE 0x40000000
60#define SDRAM0_CFG_PME 0x20000000
61#define SDRAM0_CFG_MEMCHK 0x10000000
62#define SDRAM0_CFG_REGEN 0x08000000
63#define SDRAM0_CFG_ECCDD 0x00400000
64#define SDRAM0_CFG_EMDULR 0x00200000
65#define SDRAM0_CFG_DRW_SHIFT (31-6)
66#define SDRAM0_CFG_BRPF_SHIFT (31-8)
67
68#define SDRAM0_TR_CASL_SHIFT (31-8)
69#define SDRAM0_TR_PTA_SHIFT (31-13)
70#define SDRAM0_TR_CTP_SHIFT (31-15)
71#define SDRAM0_TR_LDF_SHIFT (31-17)
72#define SDRAM0_TR_RFTA_SHIFT (31-29)
73#define SDRAM0_TR_RCD_SHIFT (31-31)
74
75#define SDRAM0_RTR_SHIFT (31-15)
76#define SDRAM0_ECCCFG_SHIFT (31-11)
77
78/* SDRAM0_CFG enable macro */
79#define SDRAM0_CFG_BRPF(x) ( ( x & 0x3)<< SDRAM0_CFG_BRPF_SHIFT )
80
81#define SDRAM0_BXCR_SZ_MASK 0x000e0000
82#define SDRAM0_BXCR_AM_MASK 0x0000e000
83
84#define SDRAM0_BXCR_SZ_SHIFT (31-14)
85#define SDRAM0_BXCR_AM_SHIFT (31-18)
86
87#define SDRAM0_BXCR_SZ(x) ( (( x << SDRAM0_BXCR_SZ_SHIFT) & SDRAM0_BXCR_SZ_MASK) )
88#define SDRAM0_BXCR_AM(x) ( (( x << SDRAM0_BXCR_AM_SHIFT) & SDRAM0_BXCR_AM_MASK) )
89
90#ifdef CONFIG_W7O
91# define SPD_ERR(x) do { return 0; } while (0)
92#else
93# define SPD_ERR(x) do { printf(x); hang(); } while (0)
94#endif
95
96/*
97 * what we really want is
98 * (1/hertz) but we don't want to use floats so multiply with 10E9
99 *
100 * The error needs to be on the safe side so we want the floor function.
101 * This means we get an exact value or we calculate that our bus frequency is
102 * a bit faster than it really is and thus we don't progam the sdram controller
103 * to run to fast
104 */
105#define sdram_HZ_to_ns(hertz) (1000000000/(hertz))
106
107/* function prototypes */
108int spd_read(uint addr); /* prototype */
109
110
111/*
112 * This function is reading data from the DIMM module EEPROM over the SPD bus
113 * and uses that to program the sdram controller.
114 *
115 * This works on boards that has the same schematics that the IBM walnut has.
116 *
117 * BUG: Don't handle ECC memory
118 * BUG: A few values in the TR register is currently hardcoded
119 */
120
121long int spd_sdram(void)
122{
123 int bus_period,tmp,row,col;
124 int total_size,bank_size,bank_code;
125 int ecc_on;
126 int mode = 4;
127 int bank_cnt = 1;
128
129 int sdram0_pmit=0x07c00000;
130 int sdram0_besr0=-1;
131 int sdram0_besr1=-1;
132 int sdram0_eccesr=-1;
133 int sdram0_ecccfg;
134
135 int sdram0_rtr=0;
136 int sdram0_tr=0;
137
138 int sdram0_b0cr;
139 int sdram0_b1cr;
140 int sdram0_b2cr;
141 int sdram0_b3cr;
142
143 int sdram0_cfg=0;
144
145 int t_rp;
146 int t_rcd;
147 int t_rc = 70; /* This value not available in SPD_EEPROM */
148 int min_cas = 2;
149
150 /*
151 * Make sure I2C controller is initialized
152 * before continuing.
153 */
154 i2c_init(CFG_I2C_SPEED, CFG_I2C_SLAVE);
155
156 /*
157 * Calculate the bus period, we do it this
158 * way to minimize stack utilization.
159 */
160 tmp = (mfdcr(pllmd) >> (31-6)) & 0xf; /* get FBDV bits */
161 tmp = CONFIG_SYS_CLK_FREQ * tmp; /* get plb freq */
162 bus_period = sdram_HZ_to_ns(tmp); /* get sdram speed */
163
164 /* Make shure we are using SDRAM */
165 if (spd_read(2) != 0x04){
166 SPD_ERR("SDRAM - non SDRAM memory module found\n");
167 }
168
169/*------------------------------------------------------------------
170 configure memory timing register
171
172 data from DIMM:
173 27 IN Row Precharge Time ( t RP)
174 29 MIN RAS to CAS Delay ( t RCD)
175 127 Component and Clock Detail ,clk0-clk3, junction temp, CAS
176 -------------------------------------------------------------------*/
177
178 /*
179 * first figure out which cas latency mode to use
180 * use the min supported mode
181 */
182
183 tmp = spd_read(127) & 0x6;
184 if(tmp == 0x02){ /* only cas = 2 supported */
185 min_cas = 2;
186/* t_ck = spd_read(9); */
187/* t_ac = spd_read(10); */
188 }
189 else if (tmp == 0x04){ /* only cas = 3 supported */
190 min_cas = 3;
191/* t_ck = spd_read(9); */
192/* t_ac = spd_read(10); */
193 }
194 else if (tmp == 0x06){ /* 2,3 supported, so use 2 */
195 min_cas = 2;
196/* t_ck = spd_read(23); */
197/* t_ac = spd_read(24); */
198 }
199 else {
200 SPD_ERR("SDRAM - unsupported CAS latency \n");
201 }
202
203 /* get some timing values, t_rp,t_rcd
204 */
205 t_rp = spd_read(27);
206 t_rcd = spd_read(29);
207
208
209 /* The following timing calcs subtract 1 before deviding.
210 * this has effect of using ceiling intead of floor rounding,
211 * and also subtracting 1 to convert number to reg value
212 */
213 /* set up CASL */
214 sdram0_tr = (min_cas - 1) << SDRAM0_TR_CASL_SHIFT;
215 /* set up PTA */
216 sdram0_tr |= (((t_rp - 1)/bus_period) & 0x3) << SDRAM0_TR_PTA_SHIFT;
217 /* set up CTP */
218 tmp = ((t_rc - t_rcd - t_rp -1) / bus_period) & 0x3;
219 if(tmp<1) SPD_ERR("SDRAM - unsupported prech to act time (Trp)\n");
220 sdram0_tr |= tmp << SDRAM0_TR_CTP_SHIFT;
221 /* set LDF = 2 cycles, reg value = 1 */
222 sdram0_tr |= 1 << SDRAM0_TR_LDF_SHIFT;
223 /* set RFTA = t_rfc/bus_period, use t_rfc = t_rc */
224 tmp = ((t_rc - 1) / bus_period)-4;
225 if(tmp<0)tmp=0;
226 if(tmp>6)tmp=6;
227 sdram0_tr |= tmp << SDRAM0_TR_RFTA_SHIFT;
228 /* set RCD = t_rcd/bus_period*/
229 sdram0_tr |= (((t_rcd - 1) / bus_period) &0x3) << SDRAM0_TR_RCD_SHIFT ;
230
231
232/*------------------------------------------------------------------
233 configure RTR register
234 -------------------------------------------------------------------*/
235 row = spd_read(3);
236 col = spd_read(4);
237 tmp = spd_read(12) & 0x7f ; /* refresh type less self refresh bit */
238 switch(tmp){
239 case 0x00:
240 tmp=15625;
241 break;
242 case 0x01:
243 tmp=15625/4;
244 break;
245 case 0x02:
246 tmp=15625/2;
247 break;
248 case 0x03:
249 tmp=15625*2;
250 break;
251 case 0x04:
252 tmp=15625*4;
253 break;
254 case 0x05:
255 tmp=15625*8;
256 break;
257 default:
258 SPD_ERR("SDRAM - Bad refresh period \n");
259 }
260 /* convert from nsec to bus cycles */
261 tmp = tmp/bus_period;
262 sdram0_rtr = (tmp & 0x3ff8)<< SDRAM0_RTR_SHIFT;
263
264/*------------------------------------------------------------------
265 determine the number of banks used
266 -------------------------------------------------------------------*/
267 /* byte 7:6 is module data width */
268 if(spd_read(7) != 0)
269 SPD_ERR("SDRAM - unsupported module width\n");
270 tmp = spd_read(6);
271 if (tmp < 32)
272 SPD_ERR("SDRAM - unsupported module width\n");
273 else if (tmp < 64)
274 bank_cnt=1; /* one bank per sdram side */
275 else if (tmp < 73)
276 bank_cnt=2; /* need two banks per side */
277 else if (tmp < 161)
278 bank_cnt=4; /* need four banks per side */
279 else
280 SPD_ERR("SDRAM - unsupported module width\n");
281
282 /* byte 5 is the module row count (refered to as dimm "sides") */
283 tmp = spd_read(5);
284 if(tmp==1);
285 else if(tmp==2) bank_cnt *=2;
286 else if(tmp==4) bank_cnt *=4;
287 else bank_cnt = 8; /* 8 is an error code */
288
289 if(bank_cnt > 4) /* we only have 4 banks to work with */
290 SPD_ERR("SDRAM - unsupported module rows for this width\n");
291
292 /* now check for ECC ability of module. We only support ECC
293 * on 32 bit wide devices with 8 bit ECC.
294 */
295 if ( (spd_read(11)==2) && ((spd_read(6)==40) || (spd_read(14)==8)) ){
296 sdram0_ecccfg=0xf<<SDRAM0_ECCCFG_SHIFT;
297 ecc_on = 1;
298 }
299 else{
300 sdram0_ecccfg=0;
301 ecc_on = 0;
302 }
303
304/*------------------------------------------------------------------
305 calculate total size
306 -------------------------------------------------------------------*/
307 /* calculate total size and do sanity check */
308 tmp = spd_read(31);
309 total_size=1<<22; /* total_size = 4MB */
310 /* now multiply 4M by the smallest device roe density */
311 /* note that we don't support asymetric rows */
312 while (((tmp & 0x0001) == 0) && (tmp != 0)){
313 total_size= total_size<<1;
314 tmp = tmp>>1;
315 }
316 total_size *= spd_read(5); /* mult by module rows (dimm sides) */
317
318/*------------------------------------------------------------------
319 map rows * cols * banks to a mode
320 -------------------------------------------------------------------*/
321
322 switch( row )
323 {
324 case 11:
325 switch ( col )
326 {
327 case 8:
328 mode=4; /* mode 5 */
329 break;
330 case 9:
331 case 10:
332 mode=0; /* mode 1 */
333 break;
334 default:
335 SPD_ERR("SDRAM - unsupported mode\n");
336 }
337 break;
338 case 12:
339 switch ( col )
340 {
341 case 8:
342 mode=3; /* mode 4 */
343 break;
344 case 9:
345 case 10:
346 mode=1; /* mode 2 */
347 break;
348 default:
349 SPD_ERR("SDRAM - unsupported mode\n");
350 }
351 break;
352 case 13:
353 switch ( col )
354 {
355 case 8:
356 mode=5; /* mode 6 */
357 break;
358 case 9:
359 case 10:
360 if (spd_read(17) ==2 )
361 mode=6; /* mode 7 */
362 else
363 mode=2; /* mode 3 */
364 break;
365 case 11:
366 mode=2; /* mode 3 */
367 break;
368 default:
369 SPD_ERR("SDRAM - unsupported mode\n");
370 }
371 break;
372 default:
373 SPD_ERR("SDRAM - unsupported mode\n");
374 }
375
376/*------------------------------------------------------------------
377 using the calculated values, compute the bank
378 config register values.
379 -------------------------------------------------------------------*/
380 sdram0_b1cr = 0;
381 sdram0_b2cr = 0;
382 sdram0_b3cr = 0;
383
384 /* compute the size of each bank */
385 bank_size = total_size / bank_cnt;
386 /* convert bank size to bank size code for ppc4xx
387 by takeing log2(bank_size) - 22 */
388 tmp=bank_size; /* start with tmp = bank_size */
389 bank_code=0; /* and bank_code = 0 */
390 while (tmp>1){ /* this takes log2 of tmp */
391 bank_code++; /* and stores result in bank_code */
392 tmp=tmp>>1;
393 } /* bank_code is now log2(bank_size) */
394 bank_code-=22; /* subtract 22 to get the code */
395
396 tmp = SDRAM0_BXCR_SZ(bank_code) | SDRAM0_BXCR_AM(mode) | 1;
397 sdram0_b0cr = (bank_size) * 0 | tmp;
398 if(bank_cnt>1) sdram0_b2cr = (bank_size) * 1 | tmp;
399 if(bank_cnt>2) sdram0_b1cr = (bank_size) * 2 | tmp;
400 if(bank_cnt>3) sdram0_b3cr = (bank_size) * 3 | tmp;
401
402
403 /*
404 * enable sdram controller DCE=1
405 * enable burst read prefetch to 32 bytes BRPF=2
406 * leave other functions off
407 */
408
409/*------------------------------------------------------------------
410 now that we've done our calculations, we are ready to
411 program all the registers.
412 -------------------------------------------------------------------*/
413
414
415#define mtsdram0(reg, data) mtdcr(memcfga,reg);mtdcr(memcfgd,data)
416 /* disable memcontroller so updates work */
417 sdram0_cfg = 0;
418 mtsdram0( mem_mcopt1, sdram0_cfg );
419
420 mtsdram0( mem_besra , sdram0_besr0 );
421 mtsdram0( mem_besrb , sdram0_besr1 );
422 mtsdram0( mem_rtr , sdram0_rtr );
423 mtsdram0( mem_pmit , sdram0_pmit );
424 mtsdram0( mem_mb0cf , sdram0_b0cr );
425 mtsdram0( mem_mb1cf , sdram0_b1cr );
426 mtsdram0( mem_mb2cf , sdram0_b2cr );
427 mtsdram0( mem_mb3cf , sdram0_b3cr );
428 mtsdram0( mem_sdtr1 , sdram0_tr );
429 mtsdram0( mem_ecccf , sdram0_ecccfg );
430 mtsdram0( mem_eccerr, sdram0_eccesr );
431
432 /* SDRAM have a power on delay, 500 micro should do */
433 udelay(500);
434 sdram0_cfg = SDRAM0_CFG_DCE | SDRAM0_CFG_BRPF(1) | SDRAM0_CFG_ECCDD | SDRAM0_CFG_EMDULR;
435 if(ecc_on) sdram0_cfg |= SDRAM0_CFG_MEMCHK;
436 mtsdram0( mem_mcopt1, sdram0_cfg );
437
438
439 /* kernel 2.4.2 from mvista has a bug with memory over 128MB */
440#ifdef MVISTA_MEM_BUG
441 if (total_size > 128*1024*1024 )
442 total_size=128*1024*1024;
443#endif
444 return (total_size);
445}
446
447int spd_read(uint addr)
448{
449 char data[2];
450
451 if (i2c_read(SPD_EEPROM_ADDRESS, addr, 1, data, 1) == 0)
452 return (int)data[0];
453 else
454 return 0;
455}
456
457#else /* CONFIG_440 */
458
459/*-----------------------------------------------------------------------------
460| Memory Controller Options 0
461+-----------------------------------------------------------------------------*/
462#define SDRAM_CFG0_DCEN 0x80000000 /* SDRAM Controller Enable */
463#define SDRAM_CFG0_MCHK_MASK 0x30000000 /* Memory data errchecking mask */
464#define SDRAM_CFG0_MCHK_NON 0x00000000 /* No ECC generation */
465#define SDRAM_CFG0_MCHK_GEN 0x20000000 /* ECC generation */
466#define SDRAM_CFG0_MCHK_CHK 0x30000000 /* ECC generation and checking */
467#define SDRAM_CFG0_RDEN 0x08000000 /* Registered DIMM enable */
468#define SDRAM_CFG0_PMUD 0x04000000 /* Page management unit */
469#define SDRAM_CFG0_DMWD_MASK 0x02000000 /* DRAM width mask */
470#define SDRAM_CFG0_DMWD_32 0x00000000 /* 32 bits */
471#define SDRAM_CFG0_DMWD_64 0x02000000 /* 64 bits */
472#define SDRAM_CFG0_UIOS_MASK 0x00C00000 /* Unused IO State */
473#define SDRAM_CFG0_PDP 0x00200000 /* Page deallocation policy */
474
475/*-----------------------------------------------------------------------------
476| Memory Controller Options 1
477+-----------------------------------------------------------------------------*/
478#define SDRAM_CFG1_SRE 0x80000000 /* Self-Refresh Entry */
479#define SDRAM_CFG1_PMEN 0x40000000 /* Power Management Enable */
480
481/*-----------------------------------------------------------------------------+
482| SDRAM DEVPOT Options
483+-----------------------------------------------------------------------------*/
484#define SDRAM_DEVOPT_DLL 0x80000000
485#define SDRAM_DEVOPT_DS 0x40000000
486
487/*-----------------------------------------------------------------------------+
488| SDRAM MCSTS Options
489+-----------------------------------------------------------------------------*/
490#define SDRAM_MCSTS_MRSC 0x80000000
491#define SDRAM_MCSTS_SRMS 0x40000000
492#define SDRAM_MCSTS_CIS 0x20000000
493
494/*-----------------------------------------------------------------------------
495| SDRAM Refresh Timer Register
496+-----------------------------------------------------------------------------*/
497#define SDRAM_RTR_RINT_MASK 0xFFFF0000
498#define SDRAM_RTR_RINT_ENCODE(n) (((n) << 16) & SDRAM_RTR_RINT_MASK)
499#define sdram_HZ_to_ns(hertz) (1000000000/(hertz))
500
501/*-----------------------------------------------------------------------------+
502| SDRAM UABus Base Address Reg
503+-----------------------------------------------------------------------------*/
504#define SDRAM_UABBA_UBBA_MASK 0x0000000F
505
506/*-----------------------------------------------------------------------------+
507| Memory Bank 0-7 configuration
508+-----------------------------------------------------------------------------*/
509#define SDRAM_BXCR_SDBA_MASK 0xff800000 /* Base address */
510#define SDRAM_BXCR_SDSZ_MASK 0x000e0000 /* Size */
511#define SDRAM_BXCR_SDSZ_8 0x00020000 /* 8M */
512#define SDRAM_BXCR_SDSZ_16 0x00040000 /* 16M */
513#define SDRAM_BXCR_SDSZ_32 0x00060000 /* 32M */
514#define SDRAM_BXCR_SDSZ_64 0x00080000 /* 64M */
515#define SDRAM_BXCR_SDSZ_128 0x000a0000 /* 128M */
516#define SDRAM_BXCR_SDSZ_256 0x000c0000 /* 256M */
517#define SDRAM_BXCR_SDSZ_512 0x000e0000 /* 512M */
518#define SDRAM_BXCR_SDAM_MASK 0x0000e000 /* Addressing mode */
519#define SDRAM_BXCR_SDAM_1 0x00000000 /* Mode 1 */
520#define SDRAM_BXCR_SDAM_2 0x00002000 /* Mode 2 */
521#define SDRAM_BXCR_SDAM_3 0x00004000 /* Mode 3 */
522#define SDRAM_BXCR_SDAM_4 0x00006000 /* Mode 4 */
523#define SDRAM_BXCR_SDBE 0x00000001 /* Memory Bank Enable */
524
525/*-----------------------------------------------------------------------------+
526| SDRAM TR0 Options
527+-----------------------------------------------------------------------------*/
528#define SDRAM_TR0_SDWR_MASK 0x80000000
529#define SDRAM_TR0_SDWR_2_CLK 0x00000000
530#define SDRAM_TR0_SDWR_3_CLK 0x80000000
531#define SDRAM_TR0_SDWD_MASK 0x40000000
532#define SDRAM_TR0_SDWD_0_CLK 0x00000000
533#define SDRAM_TR0_SDWD_1_CLK 0x40000000
534#define SDRAM_TR0_SDCL_MASK 0x01800000
535#define SDRAM_TR0_SDCL_2_0_CLK 0x00800000
536#define SDRAM_TR0_SDCL_2_5_CLK 0x01000000
537#define SDRAM_TR0_SDCL_3_0_CLK 0x01800000
538#define SDRAM_TR0_SDPA_MASK 0x000C0000
539#define SDRAM_TR0_SDPA_2_CLK 0x00040000
540#define SDRAM_TR0_SDPA_3_CLK 0x00080000
541#define SDRAM_TR0_SDPA_4_CLK 0x000C0000
542#define SDRAM_TR0_SDCP_MASK 0x00030000
543#define SDRAM_TR0_SDCP_2_CLK 0x00000000
544#define SDRAM_TR0_SDCP_3_CLK 0x00010000
545#define SDRAM_TR0_SDCP_4_CLK 0x00020000
546#define SDRAM_TR0_SDCP_5_CLK 0x00030000
547#define SDRAM_TR0_SDLD_MASK 0x0000C000
548#define SDRAM_TR0_SDLD_1_CLK 0x00000000
549#define SDRAM_TR0_SDLD_2_CLK 0x00004000
550#define SDRAM_TR0_SDRA_MASK 0x0000001C
551#define SDRAM_TR0_SDRA_6_CLK 0x00000000
552#define SDRAM_TR0_SDRA_7_CLK 0x00000004
553#define SDRAM_TR0_SDRA_8_CLK 0x00000008
554#define SDRAM_TR0_SDRA_9_CLK 0x0000000C
555#define SDRAM_TR0_SDRA_10_CLK 0x00000010
556#define SDRAM_TR0_SDRA_11_CLK 0x00000014
557#define SDRAM_TR0_SDRA_12_CLK 0x00000018
558#define SDRAM_TR0_SDRA_13_CLK 0x0000001C
559#define SDRAM_TR0_SDRD_MASK 0x00000003
560#define SDRAM_TR0_SDRD_2_CLK 0x00000001
561#define SDRAM_TR0_SDRD_3_CLK 0x00000002
562#define SDRAM_TR0_SDRD_4_CLK 0x00000003
563
564/*-----------------------------------------------------------------------------+
565| SDRAM TR1 Options
566+-----------------------------------------------------------------------------*/
567#define SDRAM_TR1_RDSS_MASK 0xC0000000
568#define SDRAM_TR1_RDSS_TR0 0x00000000
569#define SDRAM_TR1_RDSS_TR1 0x40000000
570#define SDRAM_TR1_RDSS_TR2 0x80000000
571#define SDRAM_TR1_RDSS_TR3 0xC0000000
572#define SDRAM_TR1_RDSL_MASK 0x00C00000
573#define SDRAM_TR1_RDSL_STAGE1 0x00000000
574#define SDRAM_TR1_RDSL_STAGE2 0x00400000
575#define SDRAM_TR1_RDSL_STAGE3 0x00800000
576#define SDRAM_TR1_RDCD_MASK 0x00000800
577#define SDRAM_TR1_RDCD_RCD_0_0 0x00000000
578#define SDRAM_TR1_RDCD_RCD_1_2 0x00000800
579#define SDRAM_TR1_RDCT_MASK 0x000001FF
580#define SDRAM_TR1_RDCT_ENCODE(x) (((x) << 0) & SDRAM_TR1_RDCT_MASK)
581#define SDRAM_TR1_RDCT_DECODE(x) (((x) & SDRAM_TR1_RDCT_MASK) >> 0)
582#define SDRAM_TR1_RDCT_MIN 0x00000000
583#define SDRAM_TR1_RDCT_MAX 0x000001FF
584
585/*-----------------------------------------------------------------------------+
586| SDRAM WDDCTR Options
587+-----------------------------------------------------------------------------*/
588#define SDRAM_WDDCTR_WRCP_MASK 0xC0000000
589#define SDRAM_WDDCTR_WRCP_0DEG 0x00000000
590#define SDRAM_WDDCTR_WRCP_90DEG 0x40000000
591#define SDRAM_WDDCTR_WRCP_180DEG 0x80000000
592#define SDRAM_WDDCTR_DCD_MASK 0x000001FF
593
594/*-----------------------------------------------------------------------------+
595| SDRAM CLKTR Options
596+-----------------------------------------------------------------------------*/
597#define SDRAM_CLKTR_CLKP_MASK 0xC0000000
598#define SDRAM_CLKTR_CLKP_0DEG 0x00000000
599#define SDRAM_CLKTR_CLKP_90DEG 0x40000000
600#define SDRAM_CLKTR_CLKP_180DEG 0x80000000
601#define SDRAM_CLKTR_DCDT_MASK 0x000001FF
602
603/*-----------------------------------------------------------------------------+
604| SDRAM DLYCAL Options
605+-----------------------------------------------------------------------------*/
606#define SDRAM_DLYCAL_DLCV_MASK 0x000003FC
607#define SDRAM_DLYCAL_DLCV_ENCODE(x) (((x)<<2) & SDRAM_DLYCAL_DLCV_MASK)
608#define SDRAM_DLYCAL_DLCV_DECODE(x) (((x) & SDRAM_DLYCAL_DLCV_MASK)>>2)
609
610/*-----------------------------------------------------------------------------+
611| General Definition
612+-----------------------------------------------------------------------------*/
613#define DEFAULT_SPD_ADDR1 0x53
614#define DEFAULT_SPD_ADDR2 0x52
615#define ONE_BILLION 1000000000
616#define MAXBANKS 4 /* at most 4 dimm banks */
617#define MAX_SPD_BYTES 256
618#define NUMHALFCYCLES 4
619#define NUMMEMTESTS 8
620#define NUMMEMWORDS 8
621#define MAXBXCR 4
622#define TRUE 1
623#define FALSE 0
624
625const unsigned long test[NUMMEMTESTS][NUMMEMWORDS] = {
626 {0x00000000, 0x00000000, 0xFFFFFFFF, 0xFFFFFFFF, 0x00000000, 0x00000000,
627 0xFFFFFFFF, 0xFFFFFFFF},
628 {0xFFFFFFFF, 0xFFFFFFFF, 0x00000000, 0x00000000, 0xFFFFFFFF, 0xFFFFFFFF,
629 0x00000000, 0x00000000},
630 {0xAAAAAAAA, 0xAAAAAAAA, 0x55555555, 0x55555555, 0xAAAAAAAA, 0xAAAAAAAA,
631 0x55555555, 0x55555555},
632 {0x55555555, 0x55555555, 0xAAAAAAAA, 0xAAAAAAAA, 0x55555555, 0x55555555,
633 0xAAAAAAAA, 0xAAAAAAAA},
634 {0xA5A5A5A5, 0xA5A5A5A5, 0x5A5A5A5A, 0x5A5A5A5A, 0xA5A5A5A5, 0xA5A5A5A5,
635 0x5A5A5A5A, 0x5A5A5A5A},
636 {0x5A5A5A5A, 0x5A5A5A5A, 0xA5A5A5A5, 0xA5A5A5A5, 0x5A5A5A5A, 0x5A5A5A5A,
637 0xA5A5A5A5, 0xA5A5A5A5},
638 {0xAA55AA55, 0xAA55AA55, 0x55AA55AA, 0x55AA55AA, 0xAA55AA55, 0xAA55AA55,
639 0x55AA55AA, 0x55AA55AA},
640 {0x55AA55AA, 0x55AA55AA, 0xAA55AA55, 0xAA55AA55, 0x55AA55AA, 0x55AA55AA,
641 0xAA55AA55, 0xAA55AA55}
642};
643
644
645unsigned char spd_read(uchar chip, uint addr);
646
647void get_spd_info(unsigned long* dimm_populated,
648 unsigned char* iic0_dimm_addr,
649 unsigned long num_dimm_banks);
650
651void check_mem_type
652 (unsigned long* dimm_populated,
653 unsigned char* iic0_dimm_addr,
654 unsigned long num_dimm_banks);
655
656void check_volt_type
657 (unsigned long* dimm_populated,
658 unsigned char* iic0_dimm_addr,
659 unsigned long num_dimm_banks);
660
661void program_cfg0(unsigned long* dimm_populated,
662 unsigned char* iic0_dimm_addr,
663 unsigned long num_dimm_banks);
664
665void program_cfg1(unsigned long* dimm_populated,
666 unsigned char* iic0_dimm_addr,
667 unsigned long num_dimm_banks);
668
669void program_rtr (unsigned long* dimm_populated,
670 unsigned char* iic0_dimm_addr,
671 unsigned long num_dimm_banks);
672
673void program_tr0 (unsigned long* dimm_populated,
674 unsigned char* iic0_dimm_addr,
675 unsigned long num_dimm_banks);
676
677void program_tr1 (void);
678
679void program_ecc (unsigned long num_bytes);
680
681unsigned
682long program_bxcr(unsigned long* dimm_populated,
683 unsigned char* iic0_dimm_addr,
684 unsigned long num_dimm_banks);
685
686/*
687 * This function is reading data from the DIMM module EEPROM over the SPD bus
688 * and uses that to program the sdram controller.
689 *
690 * This works on boards that has the same schematics that the IBM walnut has.
691 *
692 * BUG: Don't handle ECC memory
693 * BUG: A few values in the TR register is currently hardcoded
694 */
695
696long int spd_sdram(void) {
697 unsigned char iic0_dimm_addr[] = SPD_EEPROM_ADDRESS;
698 unsigned long dimm_populated[sizeof(iic0_dimm_addr)];
699 unsigned long total_size;
700 unsigned long cfg0;
701 unsigned long mcsts;
702 unsigned long num_dimm_banks; /* on board dimm banks */
703
704 num_dimm_banks = sizeof(iic0_dimm_addr);
705
706 /*
707 * Make sure I2C controller is initialized
708 * before continuing.
709 */
710 i2c_init(CFG_I2C_SPEED, CFG_I2C_SLAVE);
711
712 /*
713 * Read the SPD information using I2C interface. Check to see if the
714 * DIMM slots are populated.
715 */
716 get_spd_info(dimm_populated, iic0_dimm_addr, num_dimm_banks);
717
718 /*
719 * Check the memory type for the dimms plugged.
720 */
721 check_mem_type(dimm_populated, iic0_dimm_addr, num_dimm_banks);
722
723 /*
724 * Check the voltage type for the dimms plugged.
725 */
726 check_volt_type(dimm_populated, iic0_dimm_addr, num_dimm_banks);
727
728 /*
729 * program 440GP SDRAM controller options (SDRAM0_CFG0)
730 */
731 program_cfg0(dimm_populated, iic0_dimm_addr, num_dimm_banks);
732
733 /*
734 * program 440GP SDRAM controller options (SDRAM0_CFG1)
735 */
736 program_cfg1(dimm_populated, iic0_dimm_addr, num_dimm_banks);
737
738 /*
739 * program SDRAM refresh register (SDRAM0_RTR)
740 */
741 program_rtr(dimm_populated, iic0_dimm_addr, num_dimm_banks);
742
743 /*
744 * program SDRAM Timing Register 0 (SDRAM0_TR0)
745 */
746 program_tr0(dimm_populated, iic0_dimm_addr, num_dimm_banks);
747
748 /*
749 * program the BxCR registers to find out total sdram installed
750 */
751 total_size = program_bxcr(dimm_populated, iic0_dimm_addr,
752 num_dimm_banks);
753
754 /*
755 * program SDRAM Clock Timing Register (SDRAM0_CLKTR)
756 */
757 mtsdram(mem_clktr, 0x40000000);
758
759 /*
760 * delay to ensure 200 usec has elapsed
761 */
762 udelay(400);
763
764 /*
765 * enable the memory controller
766 */
767 mfsdram(mem_cfg0, cfg0);
768 mtsdram(mem_cfg0, cfg0 | SDRAM_CFG0_DCEN);
769
770 /*
771 * wait for SDRAM_CFG0_DC_EN to complete
772 */
773 while(1) {
774 mfsdram(mem_mcsts, mcsts);
775 if ((mcsts & SDRAM_MCSTS_MRSC) != 0) {
776 break;
777 }
778 }
779
780 /*
781 * program SDRAM Timing Register 1, adding some delays
782 */
783 program_tr1();
784
785 /*
786 * if ECC is enabled, initialize parity bits
787 */
788
789 return total_size;
790}
791
792unsigned char spd_read(uchar chip, uint addr) {
793 unsigned char data[2];
794
795 if (i2c_read(chip, addr, 1, data, 1) == 0)
796 return data[0];
797 else
798 return 0;
799}
800
801void get_spd_info(unsigned long* dimm_populated,
802 unsigned char* iic0_dimm_addr,
803 unsigned long num_dimm_banks)
804{
805 unsigned long dimm_num;
806 unsigned long dimm_found;
807 unsigned char num_of_bytes;
808 unsigned char total_size;
809
810 dimm_found = FALSE;
811 for (dimm_num = 0; dimm_num < num_dimm_banks; dimm_num++) {
812 num_of_bytes = 0;
813 total_size = 0;
814
815 num_of_bytes = spd_read(iic0_dimm_addr[dimm_num], 0);
816 total_size = spd_read(iic0_dimm_addr[dimm_num], 1);
817
818 if ((num_of_bytes != 0) && (total_size != 0)) {
819 dimm_populated[dimm_num] = TRUE;
820 dimm_found = TRUE;
821#if 0
822 printf("DIMM slot %lu: populated\n", dimm_num);
823#endif
824 }
825 else {
826 dimm_populated[dimm_num] = FALSE;
827#if 0
828 printf("DIMM slot %lu: Not populated\n", dimm_num);
829#endif
830 }
831 }
832
833 if (dimm_found == FALSE) {
834 printf("ERROR - No memory installed. Install a DDR-SDRAM DIMM.\n\n");
835 hang();
836 }
837}
838
839void check_mem_type(unsigned long* dimm_populated,
840 unsigned char* iic0_dimm_addr,
841 unsigned long num_dimm_banks)
842{
843 unsigned long dimm_num;
844 unsigned char dimm_type;
845
846 for (dimm_num = 0; dimm_num < num_dimm_banks; dimm_num++) {
847 if (dimm_populated[dimm_num] == TRUE) {
848 dimm_type = spd_read(iic0_dimm_addr[dimm_num], 2);
849 switch (dimm_type) {
850 case 7:
851#if 0
852 printf("DIMM slot %lu: DDR SDRAM detected\n", dimm_num);
853#endif
854 break;
855 default:
856 printf("ERROR: Unsupported DIMM detected in slot %lu.\n",
857 dimm_num);
858 printf("Only DDR SDRAM DIMMs are supported.\n");
859 printf("Replace the DIMM module with a supported DIMM.\n\n");
860 hang();
861 break;
862 }
863 }
864 }
865}
866
867
868void check_volt_type(unsigned long* dimm_populated,
869 unsigned char* iic0_dimm_addr,
870 unsigned long num_dimm_banks)
871{
872 unsigned long dimm_num;
873 unsigned long voltage_type;
874
875 for (dimm_num = 0; dimm_num < num_dimm_banks; dimm_num++) {
876 if (dimm_populated[dimm_num] == TRUE) {
877 voltage_type = spd_read(iic0_dimm_addr[dimm_num], 8);
878 if (voltage_type != 0x04) {
879 printf("ERROR: DIMM %lu with unsupported voltage level.\n",
880 dimm_num);
881 hang();
882 }
883 else {
884#if 0
885 printf("DIMM %lu voltage level supported.\n", dimm_num);
886#endif
887 }
888 break;
889 }
890 }
891}
892
893void program_cfg0(unsigned long* dimm_populated,
894 unsigned char* iic0_dimm_addr,
895 unsigned long num_dimm_banks)
896{
897 unsigned long dimm_num;
898 unsigned long cfg0;
899 unsigned long ecc_enabled;
900 unsigned char ecc;
901 unsigned char attributes;
902 unsigned long data_width;
903 unsigned long dimm_32bit;
904 unsigned long dimm_64bit;
905
906 /*
907 * get Memory Controller Options 0 data
908 */
909 mfsdram(mem_cfg0, cfg0);
910
911 /*
912 * clear bits
913 */
914 cfg0 &= ~(SDRAM_CFG0_DCEN | SDRAM_CFG0_MCHK_MASK |
915 SDRAM_CFG0_RDEN | SDRAM_CFG0_PMUD |
916 SDRAM_CFG0_DMWD_MASK |
917 SDRAM_CFG0_UIOS_MASK | SDRAM_CFG0_PDP);
918
919
920 /*
921 * FIXME: assume the DDR SDRAMs in both banks are the same
922 */
923 ecc_enabled = TRUE;
924 for (dimm_num = 0; dimm_num < num_dimm_banks; dimm_num++) {
925 if (dimm_populated[dimm_num] == TRUE) {
926 ecc = spd_read(iic0_dimm_addr[dimm_num], 11);
927 if (ecc != 0x02) {
928 ecc_enabled = FALSE;
929 }
930
931 /*
932 * program Registered DIMM Enable
933 */
934 attributes = spd_read(iic0_dimm_addr[dimm_num], 21);
935 if ((attributes & 0x02) != 0x00) {
936 cfg0 |= SDRAM_CFG0_RDEN;
937 }
938
939 /*
940 * program DDR SDRAM Data Width
941 */
942 data_width =
943 (unsigned long)spd_read(iic0_dimm_addr[dimm_num],6) +
944 (((unsigned long)spd_read(iic0_dimm_addr[dimm_num],7)) << 8);
945 if (data_width == 64 || data_width == 72) {
946 dimm_64bit = TRUE;
947 cfg0 |= SDRAM_CFG0_DMWD_64;
948 }
949 else if (data_width == 32 || data_width == 40) {
950 dimm_32bit = TRUE;
951 cfg0 |= SDRAM_CFG0_DMWD_32;
952 }
953 else {
954 printf("WARNING: DIMM with datawidth of %lu bits.\n",
955 data_width);
956 printf("Only DIMMs with 32 or 64 bit datawidths supported.\n");
957 hang();
958 }
959 break;
960 }
961 }
962
963 /*
964 * program Memory Data Error Checking
965 */
966 if (ecc_enabled == TRUE) {
967 cfg0 |= SDRAM_CFG0_MCHK_GEN;
968 }
969 else {
970 cfg0 |= SDRAM_CFG0_MCHK_NON;
971 }
972
973 /*
974 * program Page Management Unit
975 */
976 cfg0 |= SDRAM_CFG0_PMUD;
977
978 /*
979 * program Memory Controller Options 0
980 * Note: DCEN must be enabled after all DDR SDRAM controller
981 * configuration registers get initialized.
982 */
983 mtsdram(mem_cfg0, cfg0);
984}
985
986void program_cfg1(unsigned long* dimm_populated,
987 unsigned char* iic0_dimm_addr,
988 unsigned long num_dimm_banks)
989{
990 unsigned long cfg1;
991 mfsdram(mem_cfg1, cfg1);
992
993 /*
994 * Self-refresh exit, disable PM
995 */
996 cfg1 &= ~(SDRAM_CFG1_SRE | SDRAM_CFG1_PMEN);
997
998 /*
999 * program Memory Controller Options 1
1000 */
1001 mtsdram(mem_cfg1, cfg1);
1002}
1003
1004void program_rtr (unsigned long* dimm_populated,
1005 unsigned char* iic0_dimm_addr,
1006 unsigned long num_dimm_banks)
1007{
1008 unsigned long dimm_num;
1009 unsigned long bus_period_x_10;
1010 unsigned long refresh_rate = 0;
1011 unsigned char refresh_rate_type;
1012 unsigned long refresh_interval;
1013 unsigned long sdram_rtr;
1014 PPC440_SYS_INFO sys_info;
1015
1016 /*
1017 * get the board info
1018 */
1019 get_sys_info(&sys_info);
1020 bus_period_x_10 = ONE_BILLION / (sys_info.freqPLB / 10);
1021
1022
1023 for (dimm_num = 0; dimm_num < num_dimm_banks; dimm_num++) {
1024 if (dimm_populated[dimm_num] == TRUE) {
1025 refresh_rate_type = 0x7F & spd_read(iic0_dimm_addr[dimm_num], 12);
1026 switch (refresh_rate_type) {
1027 case 0x00:
1028 refresh_rate = 15625;
1029 break;
1030 case 0x011:
1031 refresh_rate = 15625/4;
1032 break;
1033 case 0x02:
1034 refresh_rate = 15625/2;
1035 break;
1036 case 0x03:
1037 refresh_rate = 15626*2;
1038 break;
1039 case 0x04:
1040 refresh_rate = 15625*4;
1041 break;
1042 case 0x05:
1043 refresh_rate = 15625*8;
1044 break;
1045 default:
1046 printf("ERROR: DIMM %lu, unsupported refresh rate/type.\n",
1047 dimm_num);
1048 printf("Replace the DIMM module with a supported DIMM.\n");
1049 break;
1050 }
1051
1052 break;
1053 }
1054 }
1055
1056 refresh_interval = refresh_rate * 10 / bus_period_x_10;
1057 sdram_rtr = (refresh_interval & 0x3ff8) << 16;
1058
1059 /*
1060 * program Refresh Timer Register (SDRAM0_RTR)
1061 */
1062 mtsdram(mem_rtr, sdram_rtr);
1063}
1064
1065void program_tr0 (unsigned long* dimm_populated,
1066 unsigned char* iic0_dimm_addr,
1067 unsigned long num_dimm_banks)
1068{
1069 unsigned long dimm_num;
1070 unsigned long tr0;
1071 unsigned char wcsbc;
1072 unsigned char t_rp_ns;
1073 unsigned char t_rcd_ns;
1074 unsigned char t_ras_ns;
1075 unsigned long t_rp_clk;
1076 unsigned long t_ras_rcd_clk;
1077 unsigned long t_rcd_clk;
1078 unsigned long t_rfc_clk;
1079 unsigned long plb_check;
1080 unsigned char cas_bit;
1081 unsigned long cas_index;
1082 unsigned char cas_2_0_available;
1083 unsigned char cas_2_5_available;
1084 unsigned char cas_3_0_available;
1085 unsigned long cycle_time_ns_x_10[3];
1086 unsigned long tcyc_3_0_ns_x_10;
1087 unsigned long tcyc_2_5_ns_x_10;
1088 unsigned long tcyc_2_0_ns_x_10;
1089 unsigned long tcyc_reg;
1090 unsigned long bus_period_x_10;
1091 PPC440_SYS_INFO sys_info;
1092 unsigned long residue;
1093
1094 /*
1095 * get the board info
1096 */
1097 get_sys_info(&sys_info);
1098 bus_period_x_10 = ONE_BILLION / (sys_info.freqPLB / 10);
1099
1100 /*
1101 * get SDRAM Timing Register 0 (SDRAM_TR0) and clear bits
1102 */
1103 mfsdram(mem_tr0, tr0);
1104 tr0 &= ~(SDRAM_TR0_SDWR_MASK | SDRAM_TR0_SDWD_MASK |
1105 SDRAM_TR0_SDCL_MASK | SDRAM_TR0_SDPA_MASK |
1106 SDRAM_TR0_SDCP_MASK | SDRAM_TR0_SDLD_MASK |
1107 SDRAM_TR0_SDRA_MASK | SDRAM_TR0_SDRD_MASK);
1108
1109 /*
1110 * initialization
1111 */
1112 wcsbc = 0;
1113 t_rp_ns = 0;
1114 t_rcd_ns = 0;
1115 t_ras_ns = 0;
1116 cas_2_0_available = TRUE;
1117 cas_2_5_available = TRUE;
1118 cas_3_0_available = TRUE;
1119 tcyc_2_0_ns_x_10 = 0;
1120 tcyc_2_5_ns_x_10 = 0;
1121 tcyc_3_0_ns_x_10 = 0;
1122
1123 for (dimm_num = 0; dimm_num < num_dimm_banks; dimm_num++) {
1124 if (dimm_populated[dimm_num] == TRUE) {
1125 wcsbc = spd_read(iic0_dimm_addr[dimm_num], 15);
1126 t_rp_ns = spd_read(iic0_dimm_addr[dimm_num], 27) >> 2;
1127 t_rcd_ns = spd_read(iic0_dimm_addr[dimm_num], 29) >> 2;
1128 t_ras_ns = spd_read(iic0_dimm_addr[dimm_num], 30);
1129 cas_bit = spd_read(iic0_dimm_addr[dimm_num], 18);
1130
1131 for (cas_index = 0; cas_index < 3; cas_index++) {
1132 switch (cas_index) {
1133 case 0:
1134 tcyc_reg = spd_read(iic0_dimm_addr[dimm_num], 9);
1135 break;
1136 case 1:
1137 tcyc_reg = spd_read(iic0_dimm_addr[dimm_num], 23);
1138 break;
1139 default:
1140 tcyc_reg = spd_read(iic0_dimm_addr[dimm_num], 25);
1141 break;
1142 }
1143
1144 if ((tcyc_reg & 0x0F) >= 10) {
1145 printf("ERROR: Tcyc incorrect for DIMM in slot %lu\n",
1146 dimm_num);
1147 hang();
1148 }
1149
1150 cycle_time_ns_x_10[cas_index] =
1151 (((tcyc_reg & 0xF0) >> 4) * 10) + (tcyc_reg & 0x0F);
1152 }
1153
1154 cas_index = 0;
1155
1156 if ((cas_bit & 0x80) != 0) {
1157 cas_index += 3;
1158 }
1159 else if ((cas_bit & 0x40) != 0) {
1160 cas_index += 2;
1161 }
1162 else if ((cas_bit & 0x20) != 0) {
1163 cas_index += 1;
1164 }
1165
1166 if (((cas_bit & 0x10) != 0) && (cas_index < 3)) {
1167 tcyc_3_0_ns_x_10 = cycle_time_ns_x_10[cas_index];
1168 cas_index++;
1169 }
1170 else {
1171 if (cas_index != 0) {
1172 cas_index++;
1173 }
1174 cas_3_0_available = FALSE;
1175 }
1176
1177 if (((cas_bit & 0x08) != 0) || (cas_index < 3)) {
1178 tcyc_2_5_ns_x_10 = cycle_time_ns_x_10[cas_index];
1179 cas_index++;
1180 }
1181 else {
1182 if (cas_index != 0) {
1183 cas_index++;
1184 }
1185 cas_2_5_available = FALSE;
1186 }
1187
1188 if (((cas_bit & 0x04) != 0) || (cas_index < 3)) {
1189 tcyc_2_0_ns_x_10 = cycle_time_ns_x_10[cas_index];
1190 cas_index++;
1191 }
1192 else {
1193 if (cas_index != 0) {
1194 cas_index++;
1195 }
1196 cas_2_0_available = FALSE;
1197 }
1198
1199 break;
1200 }
1201 }
1202
1203 /*
1204 * Program SD_WR and SD_WCSBC fields
1205 */
1206 tr0 |= SDRAM_TR0_SDWR_2_CLK; /* Write Recovery: 2 CLK */
1207 switch (wcsbc) {
1208 case 0:
1209 tr0 |= SDRAM_TR0_SDWD_0_CLK;
1210 break;
1211 default:
1212 tr0 |= SDRAM_TR0_SDWD_1_CLK;
1213 break;
1214 }
1215
1216 /*
1217 * Program SD_CASL field
1218 */
1219 if ((cas_2_0_available == TRUE) &&
1220 (bus_period_x_10 >= tcyc_2_0_ns_x_10)) {
1221 tr0 |= SDRAM_TR0_SDCL_2_0_CLK;
1222 }
1223 else if((cas_2_5_available == TRUE) &&
1224 (bus_period_x_10 >= tcyc_2_5_ns_x_10)) {
1225 tr0 |= SDRAM_TR0_SDCL_2_5_CLK;
1226 }
1227 else if((cas_3_0_available == TRUE) &&
1228 (bus_period_x_10 >= tcyc_3_0_ns_x_10)) {
1229 tr0 |= SDRAM_TR0_SDCL_3_0_CLK;
1230 }
1231 else {
1232 printf("ERROR: No supported CAS latency with the installed DIMMs.\n");
1233 printf("Only CAS latencies of 2.0, 2.5, and 3.0 are supported.\n");
1234 printf("Make sure the PLB speed is within the supported range.\n");
1235 hang();
1236 }
1237
1238 /*
1239 * Calculate Trp in clock cycles and round up if necessary
1240 * Program SD_PTA field
1241 */
1242 t_rp_clk = sys_info.freqPLB * t_rp_ns / ONE_BILLION;
1243 plb_check = ONE_BILLION * t_rp_clk / t_rp_ns;
1244 if (sys_info.freqPLB != plb_check) {
1245 t_rp_clk++;
1246 }
1247 switch ((unsigned long)t_rp_clk) {
1248 case 0:
1249 case 1:
1250 case 2:
1251 tr0 |= SDRAM_TR0_SDPA_2_CLK;
1252 break;
1253 case 3:
1254 tr0 |= SDRAM_TR0_SDPA_3_CLK;
1255 break;
1256 default:
1257 tr0 |= SDRAM_TR0_SDPA_4_CLK;
1258 break;
1259 }
1260
1261 /*
1262 * Program SD_CTP field
1263 */
1264 t_ras_rcd_clk = sys_info.freqPLB * (t_ras_ns - t_rcd_ns) / ONE_BILLION;
1265 plb_check = ONE_BILLION * t_ras_rcd_clk / (t_ras_ns - t_rcd_ns);
1266 if (sys_info.freqPLB != plb_check) {
1267 t_ras_rcd_clk++;
1268 }
1269 switch (t_ras_rcd_clk) {
1270 case 0:
1271 case 1:
1272 case 2:
1273 tr0 |= SDRAM_TR0_SDCP_2_CLK;
1274 break;
1275 case 3:
1276 tr0 |= SDRAM_TR0_SDCP_3_CLK;
1277 break;
1278 case 4:
1279 tr0 |= SDRAM_TR0_SDCP_4_CLK;
1280 break;
1281 default:
1282 tr0 |= SDRAM_TR0_SDCP_5_CLK;
1283 break;
1284 }
1285
1286 /*
1287 * Program SD_LDF field
1288 */
1289 tr0 |= SDRAM_TR0_SDLD_2_CLK;
1290
1291 /*
1292 * Program SD_RFTA field
1293 * FIXME tRFC hardcoded as 75 nanoseconds
1294 */
1295 t_rfc_clk = sys_info.freqPLB / (ONE_BILLION / 75);
1296 residue = sys_info.freqPLB % (ONE_BILLION / 75);
1297 if (residue >= (ONE_BILLION / 150)) {
1298 t_rfc_clk++;
1299 }
1300 switch (t_rfc_clk) {
1301 case 0:
1302 case 1:
1303 case 2:
1304 case 3:
1305 case 4:
1306 case 5:
1307 case 6:
1308 tr0 |= SDRAM_TR0_SDRA_6_CLK;
1309 break;
1310 case 7:
1311 tr0 |= SDRAM_TR0_SDRA_7_CLK;
1312 break;
1313 case 8:
1314 tr0 |= SDRAM_TR0_SDRA_8_CLK;
1315 break;
1316 case 9:
1317 tr0 |= SDRAM_TR0_SDRA_9_CLK;
1318 break;
1319 case 10:
1320 tr0 |= SDRAM_TR0_SDRA_10_CLK;
1321 break;
1322 case 11:
1323 tr0 |= SDRAM_TR0_SDRA_11_CLK;
1324 break;
1325 case 12:
1326 tr0 |= SDRAM_TR0_SDRA_12_CLK;
1327 break;
1328 default:
1329 tr0 |= SDRAM_TR0_SDRA_13_CLK;
1330 break;
1331 }
1332
1333 /*
1334 * Program SD_RCD field
1335 */
1336 t_rcd_clk = sys_info.freqPLB * t_rcd_ns / ONE_BILLION;
1337 plb_check = ONE_BILLION * t_rcd_clk / t_rcd_ns;
1338 if (sys_info.freqPLB != plb_check) {
1339 t_rcd_clk++;
1340 }
1341 switch (t_rcd_clk) {
1342 case 0:
1343 case 1:
1344 case 2:
1345 tr0 |= SDRAM_TR0_SDRD_2_CLK;
1346 break;
1347 case 3:
1348 tr0 |= SDRAM_TR0_SDRD_3_CLK;
1349 break;
1350 default:
1351 tr0 |= SDRAM_TR0_SDRD_4_CLK;
1352 break;
1353 }
1354
1355#if 0
1356 printf("tr0: %x\n", tr0);
1357#endif
1358 mtsdram(mem_tr0, tr0);
1359}
1360
1361void program_tr1 (void)
1362{
1363 unsigned long tr0;
1364 unsigned long tr1;
1365 unsigned long cfg0;
1366 unsigned long ecc_temp;
1367 unsigned long dlycal;
1368 unsigned long dly_val;
1369 unsigned long i, j, k;
1370 unsigned long bxcr_num;
1371 unsigned long max_pass_length;
1372 unsigned long current_pass_length;
1373 unsigned long current_fail_length;
1374 unsigned long current_start;
1375 unsigned long rdclt;
1376 unsigned long rdclt_offset;
1377 long max_start;
1378 long max_end;
1379 long rdclt_average;
1380 unsigned char window_found;
1381 unsigned char fail_found;
1382 unsigned char pass_found;
1383 unsigned long * membase;
1384 PPC440_SYS_INFO sys_info;
1385
1386 /*
1387 * get the board info
1388 */
1389 get_sys_info(&sys_info);
1390
1391 /*
1392 * get SDRAM Timing Register 0 (SDRAM_TR0) and clear bits
1393 */
1394 mfsdram(mem_tr1, tr1);
1395 tr1 &= ~(SDRAM_TR1_RDSS_MASK | SDRAM_TR1_RDSL_MASK |
1396 SDRAM_TR1_RDCD_MASK | SDRAM_TR1_RDCT_MASK);
1397
1398 mfsdram(mem_tr0, tr0);
1399 if (((tr0 & SDRAM_TR0_SDCL_MASK) == SDRAM_TR0_SDCL_2_5_CLK) &&
1400 (sys_info.freqPLB > 100000000)) {
1401 tr1 |= SDRAM_TR1_RDSS_TR2;
1402 tr1 |= SDRAM_TR1_RDSL_STAGE3;
1403 tr1 |= SDRAM_TR1_RDCD_RCD_1_2;
1404 }
1405 else {
1406 tr1 |= SDRAM_TR1_RDSS_TR1;
1407 tr1 |= SDRAM_TR1_RDSL_STAGE2;
1408 tr1 |= SDRAM_TR1_RDCD_RCD_0_0;
1409 }
1410
1411 /*
1412 * save CFG0 ECC setting to a temporary variable and turn ECC off
1413 */
1414 mfsdram(mem_cfg0, cfg0);
1415 ecc_temp = cfg0 & SDRAM_CFG0_MCHK_MASK;
1416 mtsdram(mem_cfg0, (cfg0 & ~SDRAM_CFG0_MCHK_MASK) | SDRAM_CFG0_MCHK_NON);
1417
1418 /*
1419 * get the delay line calibration register value
1420 */
1421 mfsdram(mem_dlycal, dlycal);
1422 dly_val = SDRAM_DLYCAL_DLCV_DECODE(dlycal) << 2;
1423
1424 max_pass_length = 0;
1425 max_start = 0;
1426 max_end = 0;
1427 current_pass_length = 0;
1428 current_fail_length = 0;
1429 current_start = 0;
1430 rdclt_offset = 0;
1431 window_found = FALSE;
1432 fail_found = FALSE;
1433 pass_found = FALSE;
1434#ifdef DEBUG
1435 printf("Starting memory test ");
1436#endif
1437 for (k = 0; k < NUMHALFCYCLES; k++) {
1438 for (rdclt = 0; rdclt < dly_val; rdclt++) {
1439 /*
1440 * Set the timing reg for the test.
1441 */
1442 mtsdram(mem_tr1, (tr1 | SDRAM_TR1_RDCT_ENCODE(rdclt)));
1443
1444 for (bxcr_num = 0; bxcr_num < MAXBXCR; bxcr_num++) {
1445 mtdcr(memcfga, mem_b0cr + (bxcr_num<<2));
1446 if ((mfdcr(memcfgd) & SDRAM_BXCR_SDBE) == SDRAM_BXCR_SDBE) {
1447 /* Bank is enabled */
1448 membase = (unsigned long*)
1449 (mfdcr(memcfgd) & SDRAM_BXCR_SDBA_MASK);
1450
1451 /*
1452 * Run the short memory test
1453 */
1454 for (i = 0; i < NUMMEMTESTS; i++) {
1455 for (j = 0; j < NUMMEMWORDS; j++) {
1456 membase[j] = test[i][j];
1457 ppcDcbf((unsigned long)&(membase[j]));
1458 }
1459
1460 for (j = 0; j < NUMMEMWORDS; j++) {
1461 if (membase[j] != test[i][j]) {
1462 ppcDcbf((unsigned long)&(membase[j]));
1463 break;
1464 }
1465 ppcDcbf((unsigned long)&(membase[j]));
1466 }
1467
1468 if (j < NUMMEMWORDS) {
1469 break;
1470 }
1471 }
1472
1473 /*
1474 * see if the rdclt value passed
1475 */
1476 if (i < NUMMEMTESTS) {
1477 break;
1478 }
1479 }
1480 }
1481
1482 if (bxcr_num == MAXBXCR) {
1483 if (fail_found == TRUE) {
1484 pass_found = TRUE;
1485 if (current_pass_length == 0) {
1486 current_start = rdclt_offset + rdclt;
1487 }
1488
1489 current_fail_length = 0;
1490 current_pass_length++;
1491
1492 if (current_pass_length > max_pass_length) {
1493 max_pass_length = current_pass_length;
1494 max_start = current_start;
1495 max_end = rdclt_offset + rdclt;
1496 }
1497 }
1498 }
1499 else {
1500 current_pass_length = 0;
1501 current_fail_length++;
1502
1503 if (current_fail_length >= (dly_val>>2)) {
1504 if (fail_found == FALSE) {
1505 fail_found = TRUE;
1506 }
1507 else if (pass_found == TRUE) {
1508 window_found = TRUE;
1509 break;
1510 }
1511 }
1512 }
1513 }
1514#ifdef DEBUG
1515 printf(".");
1516#endif
1517 if (window_found == TRUE) {
1518 break;
1519 }
1520
1521 tr1 = tr1 ^ SDRAM_TR1_RDCD_MASK;
1522 rdclt_offset += dly_val;
1523 }
1524#ifdef DEBUG
1525 printf("\n");
1526#endif
1527
1528 /*
1529 * make sure we find the window
1530 */
1531 if (window_found == FALSE) {
1532 printf("ERROR: Cannot determine a common read delay.\n");
1533 hang();
1534 }
1535
1536 /*
1537 * restore the orignal ECC setting
1538 */
1539 mtsdram(mem_cfg0, (cfg0 & ~SDRAM_CFG0_MCHK_MASK) | ecc_temp);
1540
1541 /*
1542 * set the SDRAM TR1 RDCD value
1543 */
1544 tr1 &= ~SDRAM_TR1_RDCD_MASK;
1545 if ((tr0 & SDRAM_TR0_SDCL_MASK) == SDRAM_TR0_SDCL_2_5_CLK) {
1546 tr1 |= SDRAM_TR1_RDCD_RCD_1_2;
1547 }
1548 else {
1549 tr1 |= SDRAM_TR1_RDCD_RCD_0_0;
1550 }
1551
1552 /*
1553 * set the SDRAM TR1 RDCLT value
1554 */
1555 tr1 &= ~SDRAM_TR1_RDCT_MASK;
1556 while (max_end >= (dly_val<<1)) {
1557 max_end -= (dly_val<<1);
1558 max_start -= (dly_val<<1);
1559 }
1560
1561 rdclt_average = ((max_start + max_end) >> 1);
1562 if (rdclt_average >= 0x60)
1563 while(1);
1564
1565 if (rdclt_average < 0) {
1566 rdclt_average = 0;
1567 }
1568
1569 if (rdclt_average >= dly_val) {
1570 rdclt_average -= dly_val;
1571 tr1 = tr1 ^ SDRAM_TR1_RDCD_MASK;
1572 }
1573 tr1 |= SDRAM_TR1_RDCT_ENCODE(rdclt_average);
1574
1575#if 0
1576 printf("tr1: %x\n", tr1);
1577#endif
1578 /*
1579 * program SDRAM Timing Register 1 TR1
1580 */
1581 mtsdram(mem_tr1, tr1);
1582}
1583
1584unsigned long program_bxcr(unsigned long* dimm_populated,
1585 unsigned char* iic0_dimm_addr,
1586 unsigned long num_dimm_banks)
1587{
1588 unsigned long dimm_num;
1589 unsigned long bxcr_num;
1590 unsigned long bank_base_addr;
1591 unsigned long bank_size_bytes;
1592 unsigned long cr;
1593 unsigned long i;
1594 unsigned long temp;
1595 unsigned char num_row_addr;
1596 unsigned char num_col_addr;
1597 unsigned char num_banks;
1598 unsigned char bank_size_id;
1599
1600
1601 /*
1602 * Set the BxCR regs. First, wipe out the bank config registers.
1603 */
1604 for (bxcr_num = 0; bxcr_num < MAXBXCR; bxcr_num++) {
1605 mtdcr(memcfga, mem_b0cr + (bxcr_num << 2));
1606 mtdcr(memcfgd, 0x00000000);
1607 }
1608
1609 /*
1610 * reset the bank_base address
1611 */
1612 bank_base_addr = CFG_SDRAM_BASE;
1613
1614 for (dimm_num = 0; dimm_num < num_dimm_banks; dimm_num++) {
1615 if (dimm_populated[dimm_num] == TRUE) {
1616 num_row_addr = spd_read(iic0_dimm_addr[dimm_num], 3);
1617 num_col_addr = spd_read(iic0_dimm_addr[dimm_num], 4);
1618 num_banks = spd_read(iic0_dimm_addr[dimm_num], 5);
1619 bank_size_id = spd_read(iic0_dimm_addr[dimm_num], 31);
1620
1621 /*
1622 * Set the SDRAM0_BxCR regs
1623 */
1624 cr = 0;
1625 bank_size_bytes = 4 * 1024 * 1024 * bank_size_id;
1626 switch (bank_size_id) {
1627 case 0x02:
1628 cr |= SDRAM_BXCR_SDSZ_8;
1629 break;
1630 case 0x04:
1631 cr |= SDRAM_BXCR_SDSZ_16;
1632 break;
1633 case 0x08:
1634 cr |= SDRAM_BXCR_SDSZ_32;
1635 break;
1636 case 0x10:
1637 cr |= SDRAM_BXCR_SDSZ_64;
1638 break;
1639 case 0x20:
1640 cr |= SDRAM_BXCR_SDSZ_128;
1641 break;
1642 case 0x40:
1643 cr |= SDRAM_BXCR_SDSZ_256;
1644 break;
1645 case 0x80:
1646 cr |= SDRAM_BXCR_SDSZ_512;
1647 break;
1648 default:
1649 printf("DDR-SDRAM: DIMM %lu BxCR configuration.\n",
1650 dimm_num);
1651 printf("ERROR: Unsupported value for the banksize: %d.\n",
1652 bank_size_id);
1653 printf("Replace the DIMM module with a supported DIMM.\n\n");
1654 hang();
1655 }
1656
1657 switch (num_col_addr) {
1658 case 0x08:
1659 cr |= SDRAM_BXCR_SDAM_1;
1660 break;
1661 case 0x09:
1662 cr |= SDRAM_BXCR_SDAM_2;
1663 break;
1664 case 0x0A:
1665 cr |= SDRAM_BXCR_SDAM_3;
1666 break;
1667 case 0x0B:
1668 cr |= SDRAM_BXCR_SDAM_4;
1669 break;
1670 default:
1671 printf("DDR-SDRAM: DIMM %lu BxCR configuration.\n",
1672 dimm_num);
1673 printf("ERROR: Unsupported value for number of "
1674 "column addresses: %d.\n", num_col_addr);
1675 printf("Replace the DIMM module with a supported DIMM.\n\n");
1676 hang();
1677 }
1678
1679 /*
1680 * enable the bank
1681 */
1682 cr |= SDRAM_BXCR_SDBE;
1683
1684 /*------------------------------------------------------------------
1685 | This next section is hardware dependent and must be programmed
1686 | to match the hardware.
1687 +-----------------------------------------------------------------*/
1688 if (dimm_num == 0) {
1689 for (i = 0; i < num_banks; i++) {
1690 mtdcr(memcfga, mem_b0cr + (i << 2));
1691 temp = mfdcr(memcfgd) & ~(SDRAM_BXCR_SDBA_MASK |
1692 SDRAM_BXCR_SDSZ_MASK |
1693 SDRAM_BXCR_SDAM_MASK |
1694 SDRAM_BXCR_SDBE);
1695 cr |= temp;
1696 cr |= bank_base_addr & SDRAM_BXCR_SDBA_MASK;
1697 mtdcr(memcfgd, cr);
1698 bank_base_addr += bank_size_bytes;
1699 }
1700 }
1701 else {
1702 for (i = 0; i < num_banks; i++) {
1703 mtdcr(memcfga, mem_b2cr + (i << 2));
1704 temp = mfdcr(memcfgd) & ~(SDRAM_BXCR_SDBA_MASK |
1705 SDRAM_BXCR_SDSZ_MASK |
1706 SDRAM_BXCR_SDAM_MASK |
1707 SDRAM_BXCR_SDBE);
1708 cr |= temp;
1709 cr |= bank_base_addr & SDRAM_BXCR_SDBA_MASK;
1710 mtdcr(memcfgd, cr);
1711 bank_base_addr += bank_size_bytes;
1712 }
1713 }
1714 }
1715 }
1716
1717 return(bank_base_addr);
1718}
1719
1720void program_ecc (unsigned long num_bytes)
1721{
1722 unsigned long bank_base_addr;
1723 unsigned long current_address;
1724 unsigned long end_address;
1725 unsigned long address_increment;
1726 unsigned long cfg0;
1727
1728 /*
1729 * get Memory Controller Options 0 data
1730 */
1731 mfsdram(mem_cfg0, cfg0);
1732
1733 /*
1734 * reset the bank_base address
1735 */
1736 bank_base_addr = CFG_SDRAM_BASE;
1737
1738 if ((cfg0 & SDRAM_CFG0_MCHK_MASK) != SDRAM_CFG0_MCHK_NON) {
1739 mtsdram(mem_cfg0, (cfg0 & ~SDRAM_CFG0_MCHK_MASK) |
1740 SDRAM_CFG0_MCHK_GEN);
1741
1742 if ((cfg0 & SDRAM_CFG0_DMWD_MASK) == SDRAM_CFG0_DMWD_32) {
1743 address_increment = 4;
1744 }
1745 else {
1746 address_increment = 8;
1747 }
1748
1749 current_address = (unsigned long)(bank_base_addr);
1750 end_address = (unsigned long)(bank_base_addr) + num_bytes;
1751
1752 while (current_address < end_address) {
1753 *((unsigned long*)current_address) = 0x00000000;
1754 current_address += address_increment;
1755 }
1756
1757 mtsdram(mem_cfg0, (cfg0 & ~SDRAM_CFG0_MCHK_MASK) |
1758 SDRAM_CFG0_MCHK_CHK);
1759 }
1760}
1761
1762#endif /* CONFIG_440 */
1763
1764#endif /* CONFIG_SPD_EEPROM */
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