1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright 2008-2012 Freescale Semiconductor, Inc.
4 * Dave Liu <daveliu@freescale.com>
5 *
6 * calculate the organization and timing parameter
7 * from ddr3 spd, please refer to the spec
8 * JEDEC standard No.21-C 4_01_02_11R18.pdf
9 */
10
11 #include <common.h>
12 #include <fsl_ddr_sdram.h>
13 #include <log.h>
14
15 #include <fsl_ddr.h>
16
17 /*
18 * Calculate the Density of each Physical Rank.
19 * Returned size is in bytes.
20 *
21 * each rank size =
22 * sdram capacity(bit) / 8 * primary bus width / sdram width
23 *
24 * where: sdram capacity = spd byte4[3:0]
25 * primary bus width = spd byte8[2:0]
26 * sdram width = spd byte7[2:0]
27 *
28 * SPD byte4 - sdram density and banks
29 * bit[3:0] size(bit) size(byte)
30 * 0000 256Mb 32MB
31 * 0001 512Mb 64MB
32 * 0010 1Gb 128MB
33 * 0011 2Gb 256MB
34 * 0100 4Gb 512MB
35 * 0101 8Gb 1GB
36 * 0110 16Gb 2GB
37 *
38 * SPD byte8 - module memory bus width
39 * bit[2:0] primary bus width
40 * 000 8bits
41 * 001 16bits
42 * 010 32bits
43 * 011 64bits
44 *
45 * SPD byte7 - module organiztion
46 * bit[2:0] sdram device width
47 * 000 4bits
48 * 001 8bits
49 * 010 16bits
50 * 011 32bits
51 *
52 */
53 static unsigned long long
compute_ranksize(const ddr3_spd_eeprom_t * spd)54 compute_ranksize(const ddr3_spd_eeprom_t *spd)
55 {
56 unsigned long long bsize;
57
58 int nbit_sdram_cap_bsize = 0;
59 int nbit_primary_bus_width = 0;
60 int nbit_sdram_width = 0;
61
62 if ((spd->density_banks & 0xf) < 7)
63 nbit_sdram_cap_bsize = (spd->density_banks & 0xf) + 28;
64 if ((spd->bus_width & 0x7) < 4)
65 nbit_primary_bus_width = (spd->bus_width & 0x7) + 3;
66 if ((spd->organization & 0x7) < 4)
67 nbit_sdram_width = (spd->organization & 0x7) + 2;
68
69 bsize = 1ULL << (nbit_sdram_cap_bsize - 3
70 + nbit_primary_bus_width - nbit_sdram_width);
71
72 debug("DDR: DDR III rank density = 0x%16llx\n", bsize);
73
74 return bsize;
75 }
76
77 /*
78 * ddr_compute_dimm_parameters for DDR3 SPD
79 *
80 * Compute DIMM parameters based upon the SPD information in spd.
81 * Writes the results to the dimm_params_t structure pointed by pdimm.
82 *
83 */
ddr_compute_dimm_parameters(const unsigned int ctrl_num,const ddr3_spd_eeprom_t * spd,dimm_params_t * pdimm,unsigned int dimm_number)84 unsigned int ddr_compute_dimm_parameters(const unsigned int ctrl_num,
85 const ddr3_spd_eeprom_t *spd,
86 dimm_params_t *pdimm,
87 unsigned int dimm_number)
88 {
89 unsigned int retval;
90 unsigned int mtb_ps;
91 int ftb_10th_ps;
92 int i;
93
94 if (spd->mem_type) {
95 if (spd->mem_type != SPD_MEMTYPE_DDR3) {
96 printf("DIMM %u: is not a DDR3 SPD.\n", dimm_number);
97 return 1;
98 }
99 } else {
100 memset(pdimm, 0, sizeof(dimm_params_t));
101 return 1;
102 }
103
104 retval = ddr3_spd_check(spd);
105 if (retval) {
106 printf("DIMM %u: failed checksum\n", dimm_number);
107 return 2;
108 }
109
110 /*
111 * The part name in ASCII in the SPD EEPROM is not null terminated.
112 * Guarantee null termination here by presetting all bytes to 0
113 * and copying the part name in ASCII from the SPD onto it
114 */
115 memset(pdimm->mpart, 0, sizeof(pdimm->mpart));
116 if ((spd->info_size_crc & 0xF) > 1)
117 memcpy(pdimm->mpart, spd->mpart, sizeof(pdimm->mpart) - 1);
118
119 /* DIMM organization parameters */
120 pdimm->n_ranks = ((spd->organization >> 3) & 0x7) + 1;
121 pdimm->rank_density = compute_ranksize(spd);
122 pdimm->capacity = pdimm->n_ranks * pdimm->rank_density;
123 pdimm->primary_sdram_width = 1 << (3 + (spd->bus_width & 0x7));
124 if ((spd->bus_width >> 3) & 0x3)
125 pdimm->ec_sdram_width = 8;
126 else
127 pdimm->ec_sdram_width = 0;
128 pdimm->data_width = pdimm->primary_sdram_width
129 + pdimm->ec_sdram_width;
130 pdimm->device_width = 1 << ((spd->organization & 0x7) + 2);
131
132 /* These are the types defined by the JEDEC DDR3 SPD spec */
133 pdimm->mirrored_dimm = 0;
134 pdimm->registered_dimm = 0;
135 switch (spd->module_type & DDR3_SPD_MODULETYPE_MASK) {
136 case DDR3_SPD_MODULETYPE_RDIMM:
137 case DDR3_SPD_MODULETYPE_MINI_RDIMM:
138 case DDR3_SPD_MODULETYPE_72B_SO_RDIMM:
139 /* Registered/buffered DIMMs */
140 pdimm->registered_dimm = 1;
141 for (i = 0; i < 16; i += 2) {
142 u8 rcw = spd->mod_section.registered.rcw[i/2];
143 pdimm->rcw[i] = (rcw >> 0) & 0x0F;
144 pdimm->rcw[i+1] = (rcw >> 4) & 0x0F;
145 }
146 break;
147
148 case DDR3_SPD_MODULETYPE_UDIMM:
149 case DDR3_SPD_MODULETYPE_SO_DIMM:
150 case DDR3_SPD_MODULETYPE_MICRO_DIMM:
151 case DDR3_SPD_MODULETYPE_MINI_UDIMM:
152 case DDR3_SPD_MODULETYPE_MINI_CDIMM:
153 case DDR3_SPD_MODULETYPE_72B_SO_UDIMM:
154 case DDR3_SPD_MODULETYPE_72B_SO_CDIMM:
155 case DDR3_SPD_MODULETYPE_LRDIMM:
156 case DDR3_SPD_MODULETYPE_16B_SO_DIMM:
157 case DDR3_SPD_MODULETYPE_32B_SO_DIMM:
158 /* Unbuffered DIMMs */
159 if (spd->mod_section.unbuffered.addr_mapping & 0x1)
160 pdimm->mirrored_dimm = 1;
161 break;
162
163 default:
164 printf("unknown module_type 0x%02X\n", spd->module_type);
165 return 1;
166 }
167
168 /* SDRAM device parameters */
169 pdimm->n_row_addr = ((spd->addressing >> 3) & 0x7) + 12;
170 pdimm->n_col_addr = (spd->addressing & 0x7) + 9;
171 pdimm->n_banks_per_sdram_device = 8 << ((spd->density_banks >> 4) & 0x7);
172
173 /*
174 * The SPD spec has not the ECC bit,
175 * We consider the DIMM as ECC capability
176 * when the extension bus exist
177 */
178 if (pdimm->ec_sdram_width)
179 pdimm->edc_config = 0x02;
180 else
181 pdimm->edc_config = 0x00;
182
183 /*
184 * The SPD spec has not the burst length byte
185 * but DDR3 spec has nature BL8 and BC4,
186 * BL8 -bit3, BC4 -bit2
187 */
188 pdimm->burst_lengths_bitmask = 0x0c;
189
190 /* MTB - medium timebase
191 * The unit in the SPD spec is ns,
192 * We convert it to ps.
193 * eg: MTB = 0.125ns (125ps)
194 */
195 mtb_ps = (spd->mtb_dividend * 1000) /spd->mtb_divisor;
196 pdimm->mtb_ps = mtb_ps;
197
198 /*
199 * FTB - fine timebase
200 * use 1/10th of ps as our unit to avoid floating point
201 * eg, 10 for 1ps, 25 for 2.5ps, 50 for 5ps
202 */
203 ftb_10th_ps =
204 ((spd->ftb_div & 0xf0) >> 4) * 10 / (spd->ftb_div & 0x0f);
205 pdimm->ftb_10th_ps = ftb_10th_ps;
206 /*
207 * sdram minimum cycle time
208 * we assume the MTB is 0.125ns
209 * eg:
210 * tck_min=15 MTB (1.875ns) ->DDR3-1066
211 * =12 MTB (1.5ns) ->DDR3-1333
212 * =10 MTB (1.25ns) ->DDR3-1600
213 */
214 pdimm->tckmin_x_ps = spd->tck_min * mtb_ps +
215 (spd->fine_tck_min * ftb_10th_ps) / 10;
216
217 /*
218 * CAS latency supported
219 * bit4 - CL4
220 * bit5 - CL5
221 * bit18 - CL18
222 */
223 pdimm->caslat_x = ((spd->caslat_msb << 8) | spd->caslat_lsb) << 4;
224
225 /*
226 * min CAS latency time
227 * eg: taa_min =
228 * DDR3-800D 100 MTB (12.5ns)
229 * DDR3-1066F 105 MTB (13.125ns)
230 * DDR3-1333H 108 MTB (13.5ns)
231 * DDR3-1600H 90 MTB (11.25ns)
232 */
233 pdimm->taa_ps = spd->taa_min * mtb_ps +
234 (spd->fine_taa_min * ftb_10th_ps) / 10;
235
236 /*
237 * min write recovery time
238 * eg:
239 * twr_min = 120 MTB (15ns) -> all speed grades.
240 */
241 pdimm->twr_ps = spd->twr_min * mtb_ps;
242
243 /*
244 * min RAS to CAS delay time
245 * eg: trcd_min =
246 * DDR3-800 100 MTB (12.5ns)
247 * DDR3-1066F 105 MTB (13.125ns)
248 * DDR3-1333H 108 MTB (13.5ns)
249 * DDR3-1600H 90 MTB (11.25)
250 */
251 pdimm->trcd_ps = spd->trcd_min * mtb_ps +
252 (spd->fine_trcd_min * ftb_10th_ps) / 10;
253
254 /*
255 * min row active to row active delay time
256 * eg: trrd_min =
257 * DDR3-800(1KB page) 80 MTB (10ns)
258 * DDR3-1333(1KB page) 48 MTB (6ns)
259 */
260 pdimm->trrd_ps = spd->trrd_min * mtb_ps;
261
262 /*
263 * min row precharge delay time
264 * eg: trp_min =
265 * DDR3-800D 100 MTB (12.5ns)
266 * DDR3-1066F 105 MTB (13.125ns)
267 * DDR3-1333H 108 MTB (13.5ns)
268 * DDR3-1600H 90 MTB (11.25ns)
269 */
270 pdimm->trp_ps = spd->trp_min * mtb_ps +
271 (spd->fine_trp_min * ftb_10th_ps) / 10;
272
273 /* min active to precharge delay time
274 * eg: tRAS_min =
275 * DDR3-800D 300 MTB (37.5ns)
276 * DDR3-1066F 300 MTB (37.5ns)
277 * DDR3-1333H 288 MTB (36ns)
278 * DDR3-1600H 280 MTB (35ns)
279 */
280 pdimm->tras_ps = (((spd->tras_trc_ext & 0xf) << 8) | spd->tras_min_lsb)
281 * mtb_ps;
282 /*
283 * min active to actice/refresh delay time
284 * eg: tRC_min =
285 * DDR3-800D 400 MTB (50ns)
286 * DDR3-1066F 405 MTB (50.625ns)
287 * DDR3-1333H 396 MTB (49.5ns)
288 * DDR3-1600H 370 MTB (46.25ns)
289 */
290 pdimm->trc_ps = (((spd->tras_trc_ext & 0xf0) << 4) | spd->trc_min_lsb)
291 * mtb_ps + (spd->fine_trc_min * ftb_10th_ps) / 10;
292 /*
293 * min refresh recovery delay time
294 * eg: tRFC_min =
295 * 512Mb 720 MTB (90ns)
296 * 1Gb 880 MTB (110ns)
297 * 2Gb 1280 MTB (160ns)
298 */
299 pdimm->trfc_ps = ((spd->trfc_min_msb << 8) | spd->trfc_min_lsb)
300 * mtb_ps;
301 /*
302 * min internal write to read command delay time
303 * eg: twtr_min = 40 MTB (7.5ns) - all speed bins.
304 * tWRT is at least 4 mclk independent of operating freq.
305 */
306 pdimm->twtr_ps = spd->twtr_min * mtb_ps;
307
308 /*
309 * min internal read to precharge command delay time
310 * eg: trtp_min = 40 MTB (7.5ns) - all speed bins.
311 * tRTP is at least 4 mclk independent of operating freq.
312 */
313 pdimm->trtp_ps = spd->trtp_min * mtb_ps;
314
315 /*
316 * Average periodic refresh interval
317 * tREFI = 7.8 us at normal temperature range
318 * = 3.9 us at ext temperature range
319 */
320 pdimm->refresh_rate_ps = 7800000;
321 if ((spd->therm_ref_opt & 0x1) && !(spd->therm_ref_opt & 0x2)) {
322 pdimm->refresh_rate_ps = 3900000;
323 pdimm->extended_op_srt = 1;
324 }
325
326 /*
327 * min four active window delay time
328 * eg: tfaw_min =
329 * DDR3-800(1KB page) 320 MTB (40ns)
330 * DDR3-1066(1KB page) 300 MTB (37.5ns)
331 * DDR3-1333(1KB page) 240 MTB (30ns)
332 * DDR3-1600(1KB page) 240 MTB (30ns)
333 */
334 pdimm->tfaw_ps = (((spd->tfaw_msb & 0xf) << 8) | spd->tfaw_min)
335 * mtb_ps;
336
337 return 0;
338 }
339