24  * where: sdram capacity  = spd byte4[3:0]
25  *        primary bus width = spd byte8[2:0]
26  *        sdram width = spd byte7[2:0]
29  *	bit[3:0]	size(bit)	size(byte)
39  * 	bit[2:0]	primary bus width
46  * 	bit[2:0]	sdram device width
58 	int nbit_sdram_cap_bsize = 0;  in compute_ranksize()
59 	int nbit_primary_bus_width = 0;  in compute_ranksize()
60 	int nbit_sdram_width = 0;  in compute_ranksize()
62 	if ((spd->density_banks & 0xf) < 7)  in compute_ranksize()
63 		nbit_sdram_cap_bsize = (spd->density_banks & 0xf) + 28;  in compute_ranksize()
64 	if ((spd->bus_width & 0x7) < 4)  in compute_ranksize()
65 		nbit_primary_bus_width = (spd->bus_width & 0x7) + 3;  in compute_ranksize()
66 	if ((spd->organization & 0x7) < 4)  in compute_ranksize()
67 		nbit_sdram_width = (spd->organization & 0x7) + 2;  in compute_ranksize()
72 	debug("DDR: DDR III rank density = 0x%16llx\n", bsize);  in compute_ranksize()
100 		memset(pdimm, 0, sizeof(dimm_params_t));  in ddr_compute_dimm_parameters()
112 	 * Guarantee null termination here by presetting all bytes to 0  in ddr_compute_dimm_parameters()
115 	memset(pdimm->mpart, 0, sizeof(pdimm->mpart));  in ddr_compute_dimm_parameters()
116 	if ((spd->info_size_crc & 0xF) > 1)  in ddr_compute_dimm_parameters()
120 	pdimm->n_ranks = ((spd->organization >> 3) & 0x7) + 1;  in ddr_compute_dimm_parameters()
123 	pdimm->primary_sdram_width = 1 << (3 + (spd->bus_width & 0x7));  in ddr_compute_dimm_parameters()
124 	if ((spd->bus_width >> 3) & 0x3)  in ddr_compute_dimm_parameters()
127 		pdimm->ec_sdram_width = 0;  in ddr_compute_dimm_parameters()
130 	pdimm->device_width = 1 << ((spd->organization & 0x7) + 2);  in ddr_compute_dimm_parameters()
133 	pdimm->mirrored_dimm = 0;  in ddr_compute_dimm_parameters()
134 	pdimm->registered_dimm = 0;  in ddr_compute_dimm_parameters()
141 		for (i = 0; i < 16; i += 2) {  in ddr_compute_dimm_parameters()
143 			pdimm->rcw[i]   = (rcw >> 0) & 0x0F;  in ddr_compute_dimm_parameters()
144 			pdimm->rcw[i+1] = (rcw >> 4) & 0x0F;  in ddr_compute_dimm_parameters()
159 		if (spd->mod_section.unbuffered.addr_mapping & 0x1)  in ddr_compute_dimm_parameters()
164 		printf("unknown module_type 0x%02X\n", spd->module_type);  in ddr_compute_dimm_parameters()
169 	pdimm->n_row_addr = ((spd->addressing >> 3) & 0x7) + 12;  in ddr_compute_dimm_parameters()
170 	pdimm->n_col_addr = (spd->addressing & 0x7) + 9;  in ddr_compute_dimm_parameters()
171 	pdimm->n_banks_per_sdram_device = 8 << ((spd->density_banks >> 4) & 0x7);  in ddr_compute_dimm_parameters()
179 		pdimm->edc_config = 0x02;  in ddr_compute_dimm_parameters()
181 		pdimm->edc_config = 0x00;  in ddr_compute_dimm_parameters()
188 	pdimm->burst_lengths_bitmask = 0x0c;  in ddr_compute_dimm_parameters()
192 	 * The unit in the SPD spec is ns,  in ddr_compute_dimm_parameters()
194 	 * eg: MTB = 0.125ns (125ps)  in ddr_compute_dimm_parameters()
205 		((spd->ftb_div & 0xf0) >> 4) * 10 / (spd->ftb_div & 0x0f);  in ddr_compute_dimm_parameters()
209 	 * we assume the MTB is 0.125ns  in ddr_compute_dimm_parameters()
211 	 * tck_min=15 MTB (1.875ns) ->DDR3-1066  in ddr_compute_dimm_parameters()
212 	 *        =12 MTB (1.5ns) ->DDR3-1333  in ddr_compute_dimm_parameters()
213 	 *        =10 MTB (1.25ns) ->DDR3-1600  in ddr_compute_dimm_parameters()
229 	 * DDR3-800D	100 MTB (12.5ns)  in ddr_compute_dimm_parameters()
230 	 * DDR3-1066F	105 MTB (13.125ns)  in ddr_compute_dimm_parameters()
231 	 * DDR3-1333H	108 MTB (13.5ns)  in ddr_compute_dimm_parameters()
232 	 * DDR3-1600H	90 MTB (11.25ns)  in ddr_compute_dimm_parameters()
240 	 * twr_min = 120 MTB (15ns) -> all speed grades.  in ddr_compute_dimm_parameters()
247 	 * DDR3-800	100 MTB (12.5ns)  in ddr_compute_dimm_parameters()
248 	 * DDR3-1066F	105 MTB (13.125ns)  in ddr_compute_dimm_parameters()
249 	 * DDR3-1333H	108 MTB (13.5ns)  in ddr_compute_dimm_parameters()
258 	 * DDR3-800(1KB page)	80 MTB (10ns)  in ddr_compute_dimm_parameters()
259 	 * DDR3-1333(1KB page)	48 MTB (6ns)  in ddr_compute_dimm_parameters()
266 	 * DDR3-800D	100 MTB (12.5ns)  in ddr_compute_dimm_parameters()
267 	 * DDR3-1066F	105 MTB (13.125ns)  in ddr_compute_dimm_parameters()
268 	 * DDR3-1333H	108 MTB (13.5ns)  in ddr_compute_dimm_parameters()
269 	 * DDR3-1600H	90 MTB (11.25ns)  in ddr_compute_dimm_parameters()
276 	 * DDR3-800D	300 MTB (37.5ns)  in ddr_compute_dimm_parameters()
277 	 * DDR3-1066F	300 MTB (37.5ns)  in ddr_compute_dimm_parameters()
278 	 * DDR3-1333H	288 MTB (36ns)  in ddr_compute_dimm_parameters()
279 	 * DDR3-1600H	280 MTB (35ns)  in ddr_compute_dimm_parameters()
281 	pdimm->tras_ps = (((spd->tras_trc_ext & 0xf) << 8) | spd->tras_min_lsb)  in ddr_compute_dimm_parameters()
286 	 * DDR3-800D	400 MTB (50ns)  in ddr_compute_dimm_parameters()
287 	 * DDR3-1066F	405 MTB (50.625ns)  in ddr_compute_dimm_parameters()
288 	 * DDR3-1333H	396 MTB (49.5ns)  in ddr_compute_dimm_parameters()
289 	 * DDR3-1600H	370 MTB (46.25ns)  in ddr_compute_dimm_parameters()
291 	pdimm->trc_ps = (((spd->tras_trc_ext & 0xf0) << 4) | spd->trc_min_lsb)  in ddr_compute_dimm_parameters()
296 	 * 512Mb	720 MTB (90ns)  in ddr_compute_dimm_parameters()
297 	 * 1Gb		880 MTB (110ns)  in ddr_compute_dimm_parameters()
298 	 * 2Gb		1280 MTB (160ns)  in ddr_compute_dimm_parameters()
304 	 * eg: twtr_min = 40 MTB (7.5ns) - all speed bins.  in ddr_compute_dimm_parameters()
311 	 * eg: trtp_min = 40 MTB (7.5ns) - all speed bins.  in ddr_compute_dimm_parameters()
322 	if ((spd->therm_ref_opt & 0x1) && !(spd->therm_ref_opt & 0x2)) {  in ddr_compute_dimm_parameters()
330 	 * DDR3-800(1KB page)	320 MTB (40ns)  in ddr_compute_dimm_parameters()
331 	 * DDR3-1066(1KB page)	300 MTB (37.5ns)  in ddr_compute_dimm_parameters()
332 	 * DDR3-1333(1KB page)	240 MTB (30ns)  in ddr_compute_dimm_parameters()
333 	 * DDR3-1600(1KB page)	240 MTB (30ns)  in ddr_compute_dimm_parameters()
335 	pdimm->tfaw_ps = (((spd->tfaw_msb & 0xf) << 8) | spd->tfaw_min)  in ddr_compute_dimm_parameters()
338 	return 0;  in ddr_compute_dimm_parameters()