2 * Copyright 2008 Freescale Semiconductor, Inc.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * Version 2 as published by the Free Software Foundation.
10 #include <asm/fsl_ddr_sdram.h>
14 /* Board-specific functions defined in each board's ddr.c */
15 extern void fsl_ddr_board_options(memctl_options_t
*popts
,
17 unsigned int ctrl_num
);
19 unsigned int populate_memctl_options(int all_DIMMs_registered
,
20 memctl_options_t
*popts
,
22 unsigned int ctrl_num
)
27 /* Chip select options. */
29 /* Pick chip-select local options. */
30 for (i
= 0; i
< CONFIG_CHIP_SELECTS_PER_CTRL
; i
++) {
31 /* If not DDR2, odt_rd_cfg and odt_wr_cfg need to be 0. */
33 /* only for single CS? */
34 popts
->cs_local_opts
[i
].odt_rd_cfg
= 0;
36 popts
->cs_local_opts
[i
].odt_wr_cfg
= 1;
37 popts
->cs_local_opts
[i
].auto_precharge
= 0;
40 /* Pick interleaving mode. */
44 * 1 = interleaving between 2 controllers
46 popts
->memctl_interleaving
= 0;
52 * 3 = superbank (only if CS interleaving is enabled)
54 popts
->memctl_interleaving_mode
= 0;
57 * 0: cacheline: bit 30 of the 36-bit physical addr selects the memctl
58 * 1: page: bit to the left of the column bits selects the memctl
59 * 2: bank: bit to the left of the bank bits selects the memctl
60 * 3: superbank: bit to the left of the chip select selects the memctl
62 * NOTE: ba_intlv (rank interleaving) is independent of memory
63 * controller interleaving; it is only within a memory controller.
64 * Must use superbank interleaving if rank interleaving is used and
65 * memory controller interleaving is enabled.
72 * 0x60 = CS0,CS1 + CS2,CS3
73 * 0x04 = CS0,CS1,CS2,CS3
75 popts
->ba_intlv_ctl
= 0;
77 /* Memory Organization Parameters */
78 popts
->registered_dimm_en
= all_DIMMs_registered
;
80 /* Operational Mode Paramters */
84 popts
->ECC_mode
= 1; /* 0 = disabled, 1 = enabled */
86 popts
->ECC_mode
= 0; /* 0 = disabled, 1 = enabled */
88 popts
->ECC_init_using_memctl
= 1; /* 0 = use DMA, 1 = use memctl */
95 #if defined(CONFIG_FSL_DDR1)
96 popts
->DQS_config
= 0;
97 #elif defined(CONFIG_FSL_DDR2)
98 popts
->DQS_config
= 1;
100 #error "Fix DQS for DDR3"
103 /* Choose self-refresh during sleep. */
104 popts
->self_refresh_in_sleep
= 1;
106 /* Choose dynamic power management mode. */
107 popts
->dynamic_power
= 0;
109 /* 0 = 64-bit, 1 = 32-bit, 2 = 16-bit */
110 popts
->data_bus_width
= 0;
112 /* Choose burst length. */
113 popts
->burst_length
= 4; /* has to be 4 for DDR2 */
115 /* Global Timing Parameters. */
116 debug("mclk_ps = %u ps\n", get_memory_clk_period_ps());
118 /* Pick a caslat override. */
119 popts
->cas_latency_override
= 0;
120 popts
->cas_latency_override_value
= 3;
121 if (popts
->cas_latency_override
) {
122 debug("using caslat override value = %u\n",
123 popts
->cas_latency_override_value
);
126 /* Decide whether to use the computed derated latency */
127 popts
->use_derated_caslat
= 0;
129 /* Choose an additive latency. */
130 popts
->additive_latency_override
= 0;
131 popts
->additive_latency_override_value
= 3;
132 if (popts
->additive_latency_override
) {
133 debug("using additive latency override value = %u\n",
134 popts
->additive_latency_override_value
);
140 * Factors to consider for 2T_EN:
141 * - number of DIMMs installed
142 * - number of components, number of active ranks
143 * - how much time you want to spend playing around
146 popts
->threeT_en
= 0;
149 * BSTTOPRE precharge interval
151 * Set this to 0 for global auto precharge
153 * FIXME: Should this be configured in picoseconds?
154 * Why it should be in ps: better understanding of this
155 * relative to actual DRAM timing parameters such as tRAS.
156 * e.g. tRAS(min) = 40 ns
158 popts
->bstopre
= 0x100;
160 /* Minimum CKE pulse width -- tCKE(MIN) */
161 popts
->tCKE_clock_pulse_width_ps
162 = mclk_to_picos(FSL_DDR_MIN_TCKE_PULSE_WIDTH_DDR
);
165 * Window for four activates -- tFAW
167 * FIXME: UM: applies only to DDR2/DDR3 with eight logical banks only
168 * FIXME: varies depending upon number of column addresses or data
169 * FIXME: width, was considering looking at pdimm->primary_sdram_width
171 #if defined(CONFIG_FSL_DDR1)
172 popts
->tFAW_window_four_activates_ps
= mclk_to_picos(1);
174 #elif defined(CONFIG_FSL_DDR2)
176 * x4/x8; some datasheets have 35000
177 * x16 wide columns only? Use 50000?
179 popts
->tFAW_window_four_activates_ps
= 37500;
181 #elif defined(CONFIG_FSL_DDR3)
182 #error "FIXME determine four activates for DDR3"
186 * Check interleaving configuration from environment.
187 * Please refer to doc/README.fsl-ddr for the detail.
189 * If memory controller interleaving is enabled, then the data
190 * bus widths must be programmed identically for the 2 memory
193 * XXX: Attempt to set both controllers to the same chip select
194 * interleaving mode. It will do a best effort to get the
195 * requested ranks interleaved together such that the result
196 * should be a subset of the requested configuration.
198 if ((p
= getenv("memctl_intlv_ctl")) != NULL
) {
199 if (pdimm
[0].n_ranks
== 0) {
200 printf("There is no rank on CS0. Because only rank on \
201 CS0 and ranks chip-select interleaved with CS0\
202 are controller interleaved, force non memory \
203 controller interleaving\n");
204 popts
->memctl_interleaving
= 0;
206 popts
->memctl_interleaving
= 1;
207 if (strcmp(p
, "cacheline") == 0)
208 popts
->memctl_interleaving_mode
=
209 FSL_DDR_CACHE_LINE_INTERLEAVING
;
210 else if (strcmp(p
, "page") == 0)
211 popts
->memctl_interleaving_mode
=
212 FSL_DDR_PAGE_INTERLEAVING
;
213 else if (strcmp(p
, "bank") == 0)
214 popts
->memctl_interleaving_mode
=
215 FSL_DDR_BANK_INTERLEAVING
;
216 else if (strcmp(p
, "superbank") == 0)
217 popts
->memctl_interleaving_mode
=
218 FSL_DDR_SUPERBANK_INTERLEAVING
;
220 popts
->memctl_interleaving_mode
=
221 simple_strtoul(p
, NULL
, 0);
225 if( (p
= getenv("ba_intlv_ctl")) != NULL
) {
226 if (strcmp(p
, "cs0_cs1") == 0)
227 popts
->ba_intlv_ctl
= FSL_DDR_CS0_CS1
;
228 else if (strcmp(p
, "cs2_cs3") == 0)
229 popts
->ba_intlv_ctl
= FSL_DDR_CS2_CS3
;
230 else if (strcmp(p
, "cs0_cs1_and_cs2_cs3") == 0)
231 popts
->ba_intlv_ctl
= FSL_DDR_CS0_CS1_AND_CS2_CS3
;
232 else if (strcmp(p
, "cs0_cs1_cs2_cs3") == 0)
233 popts
->ba_intlv_ctl
= FSL_DDR_CS0_CS1_CS2_CS3
;
235 popts
->ba_intlv_ctl
= simple_strtoul(p
, NULL
, 0);
237 switch (popts
->ba_intlv_ctl
& FSL_DDR_CS0_CS1_CS2_CS3
) {
238 case FSL_DDR_CS0_CS1_CS2_CS3
:
239 case FSL_DDR_CS0_CS1
:
240 if (pdimm
[0].n_ranks
!= 2) {
241 popts
->ba_intlv_ctl
= 0;
242 printf("No enough bank(chip-select) for \
243 CS0+CS1, force non-interleaving!\n");
246 case FSL_DDR_CS2_CS3
:
247 if (pdimm
[1].n_ranks
!=2){
248 popts
->ba_intlv_ctl
= 0;
249 printf("No enough bank(CS) for CS2+CS3, \
250 force non-interleaving!\n");
253 case FSL_DDR_CS0_CS1_AND_CS2_CS3
:
254 if ((pdimm
[0].n_ranks
!= 2)||(pdimm
[1].n_ranks
!= 2)) {
255 popts
->ba_intlv_ctl
= 0;
256 printf("No enough bank(CS) for CS0+CS1 or \
257 CS2+CS3, force non-interleaving!\n");
261 popts
->ba_intlv_ctl
= 0;
266 fsl_ddr_board_options(popts
, pdimm
, ctrl_num
);