1 /*
2  * Copyright 2009-2011 Freescale Semiconductor, Inc.
3  *
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.
7  */
8 
9 #include <common.h>
10 #include <i2c.h>
11 #include <hwconfig.h>
12 #include <asm/mmu.h>
13 #include <asm/fsl_ddr_sdram.h>
14 #include <asm/fsl_ddr_dimm_params.h>
15 #include <asm/fsl_law.h>
16 
17 DECLARE_GLOBAL_DATA_PTR;
18 
19 
20 /*
21  * Fixed sdram init -- doesn't use serial presence detect.
22  */
23 extern fixed_ddr_parm_t fixed_ddr_parm_0[];
24 #if (CONFIG_NUM_DDR_CONTROLLERS == 2)
25 extern fixed_ddr_parm_t fixed_ddr_parm_1[];
26 #endif
27 
28 phys_size_t fixed_sdram(void)
29 {
30 	int i;
31 	char buf[32];
32 	fsl_ddr_cfg_regs_t ddr_cfg_regs;
33 	phys_size_t ddr_size;
34 	unsigned int lawbar1_target_id;
35 	ulong ddr_freq, ddr_freq_mhz;
36 
37 	ddr_freq = get_ddr_freq(0);
38 	ddr_freq_mhz = ddr_freq / 1000000;
39 
40 	printf("Configuring DDR for %s MT/s data rate\n",
41 				strmhz(buf, ddr_freq));
42 
43 	for (i = 0; fixed_ddr_parm_0[i].max_freq > 0; i++) {
44 		if ((ddr_freq_mhz > fixed_ddr_parm_0[i].min_freq) &&
45 		   (ddr_freq_mhz <= fixed_ddr_parm_0[i].max_freq)) {
46 			memcpy(&ddr_cfg_regs,
47 				fixed_ddr_parm_0[i].ddr_settings,
48 				sizeof(ddr_cfg_regs));
49 			break;
50 		}
51 	}
52 
53 	if (fixed_ddr_parm_0[i].max_freq == 0)
54 		panic("Unsupported DDR data rate %s MT/s data rate\n",
55 			strmhz(buf, ddr_freq));
56 
57 	ddr_size = (phys_size_t) CONFIG_SYS_SDRAM_SIZE * 1024 * 1024;
58 	ddr_cfg_regs.ddr_cdr1 = DDR_CDR1_DHC_EN;
59 	fsl_ddr_set_memctl_regs(&ddr_cfg_regs, 0, 0);
60 
61 #if (CONFIG_NUM_DDR_CONTROLLERS == 2)
62 	memcpy(&ddr_cfg_regs,
63 		fixed_ddr_parm_1[i].ddr_settings,
64 		sizeof(ddr_cfg_regs));
65 	ddr_cfg_regs.ddr_cdr1 = DDR_CDR1_DHC_EN;
66 	fsl_ddr_set_memctl_regs(&ddr_cfg_regs, 1, 0);
67 #endif
68 
69 	/*
70 	 * setup laws for DDR. If not interleaving, presuming half memory on
71 	 * DDR1 and the other half on DDR2
72 	 */
73 	if (fixed_ddr_parm_0[i].ddr_settings->cs[0].config & 0x20000000) {
74 		if (set_ddr_laws(CONFIG_SYS_DDR_SDRAM_BASE,
75 				 ddr_size,
76 				 LAW_TRGT_IF_DDR_INTRLV) < 0) {
77 			printf("ERROR setting Local Access Windows for DDR\n");
78 			return 0;
79 		}
80 	} else {
81 #if (CONFIG_NUM_DDR_CONTROLLERS == 2)
82 		/* We require both controllers have identical DIMMs */
83 		lawbar1_target_id = LAW_TRGT_IF_DDR_1;
84 		if (set_ddr_laws(CONFIG_SYS_DDR_SDRAM_BASE,
85 				 ddr_size / 2,
86 				 lawbar1_target_id) < 0) {
87 			printf("ERROR setting Local Access Windows for DDR\n");
88 			return 0;
89 		}
90 		lawbar1_target_id = LAW_TRGT_IF_DDR_2;
91 		if (set_ddr_laws(CONFIG_SYS_DDR_SDRAM_BASE + ddr_size / 2,
92 				 ddr_size / 2,
93 				 lawbar1_target_id) < 0) {
94 			printf("ERROR setting Local Access Windows for DDR\n");
95 			return 0;
96 		}
97 #else
98 		lawbar1_target_id = LAW_TRGT_IF_DDR_1;
99 		if (set_ddr_laws(CONFIG_SYS_DDR_SDRAM_BASE,
100 				 ddr_size,
101 				 lawbar1_target_id) < 0) {
102 			printf("ERROR setting Local Access Windows for DDR\n");
103 			return 0;
104 		}
105 #endif
106 	}
107 	return ddr_size;
108 }
109 
110 struct board_specific_parameters {
111 	u32 n_ranks;
112 	u32 datarate_mhz_high;
113 	u32 clk_adjust;
114 	u32 wrlvl_start;
115 	u32 cpo;
116 	u32 write_data_delay;
117 	u32 force_2t;
118 };
119 
120 /*
121  * This table contains all valid speeds we want to override with board
122  * specific parameters. datarate_mhz_high values need to be in ascending order
123  * for each n_ranks group.
124  */
125 static const struct board_specific_parameters udimm0[] = {
126 	/*
127 	 * memory controller 0
128 	 *   num|  hi|  clk| wrlvl | cpo  |wrdata|2T
129 	 * ranks| mhz|adjst| start |      |delay |
130 	 */
131 	{4,   850,    4,     6,   0xff,    2,  0},
132 	{4,   950,    5,     7,   0xff,    2,  0},
133 	{4,  1050,    5,     8,   0xff,    2,  0},
134 	{4,  1250,    5,    10,   0xff,    2,  0},
135 	{4,  1350,    5,    11,   0xff,    2,  0},
136 	{4,  1666,    5,    12,   0xff,    2,  0},
137 	{2,   850,    5,     6,   0xff,    2,  0},
138 	{2,  1050,    5,     7,   0xff,    2,  0},
139 	{2,  1250,    4,     6,   0xff,    2,  0},
140 	{2,  1350,    5,     7,   0xff,    2,  0},
141 	{2,  1666,    5,     8,   0xff,    2,  0},
142 	{1,  1250,    4,     6,   0xff,    2,  0},
143 	{1,  1335,    4,     7,   0xff,    2,  0},
144 	{1,  1666,    4,     8,   0xff,    2,  0},
145 	{}
146 };
147 
148 /*
149  * The two slots have slightly different timing. The center values are good
150  * for both slots. We use identical speed tables for them. In future use, if
151  * DIMMs have fewer center values that require two separated tables, copy the
152  * udimm0 table to udimm1 and make changes to clk_adjust and wrlvl_start.
153  */
154 static const struct board_specific_parameters *udimms[] = {
155 	udimm0,
156 	udimm0,
157 };
158 
159 static const struct board_specific_parameters rdimm0[] = {
160 	/*
161 	 * memory controller 0
162 	 *   num|  hi|  clk| wrlvl | cpo  |wrdata|2T
163 	 * ranks| mhz|adjst| start |      |delay |
164 	 */
165 	{4,   850,    4,     6,   0xff,    2,  0},
166 	{4,   950,    5,     7,   0xff,    2,  0},
167 	{4,  1050,    5,     8,   0xff,    2,  0},
168 	{4,  1250,    5,    10,   0xff,    2,  0},
169 	{4,  1350,    5,    11,   0xff,    2,  0},
170 	{4,  1666,    5,    12,   0xff,    2,  0},
171 	{2,   850,    4,     6,   0xff,    2,  0},
172 	{2,  1050,    4,     7,   0xff,    2,  0},
173 	{2,  1666,    4,     8,   0xff,    2,  0},
174 	{1,   850,    4,     5,   0xff,    2,  0},
175 	{1,   950,    4,     7,   0xff,    2,  0},
176 	{1,  1666,    4,     8,   0xff,    2,  0},
177 	{}
178 };
179 
180 /*
181  * The two slots have slightly different timing. See comments above.
182  */
183 static const struct board_specific_parameters *rdimms[] = {
184 	rdimm0,
185 	rdimm0,
186 };
187 
188 void fsl_ddr_board_options(memctl_options_t *popts,
189 				dimm_params_t *pdimm,
190 				unsigned int ctrl_num)
191 {
192 	const struct board_specific_parameters *pbsp, *pbsp_highest = NULL;
193 	ulong ddr_freq;
194 
195 	if (ctrl_num > 1) {
196 		printf("Wrong parameter for controller number %d", ctrl_num);
197 		return;
198 	}
199 	if (!pdimm->n_ranks)
200 		return;
201 
202 	if (popts->registered_dimm_en)
203 		pbsp = rdimms[ctrl_num];
204 	else
205 		pbsp = udimms[ctrl_num];
206 
207 
208 	/* Get clk_adjust, cpo, write_data_delay,2T, according to the board ddr
209 	 * freqency and n_banks specified in board_specific_parameters table.
210 	 */
211 	ddr_freq = get_ddr_freq(0) / 1000000;
212 	while (pbsp->datarate_mhz_high) {
213 		if (pbsp->n_ranks == pdimm->n_ranks) {
214 			if (ddr_freq <= pbsp->datarate_mhz_high) {
215 				popts->cpo_override = pbsp->cpo;
216 				popts->write_data_delay =
217 					pbsp->write_data_delay;
218 				popts->clk_adjust = pbsp->clk_adjust;
219 				popts->wrlvl_start = pbsp->wrlvl_start;
220 				popts->twot_en = pbsp->force_2t;
221 				goto found;
222 			}
223 			pbsp_highest = pbsp;
224 		}
225 		pbsp++;
226 	}
227 
228 	if (pbsp_highest) {
229 		printf("Error: board specific timing not found "
230 			"for data rate %lu MT/s!\n"
231 			"Trying to use the highest speed (%u) parameters\n",
232 			ddr_freq, pbsp_highest->datarate_mhz_high);
233 		popts->cpo_override = pbsp_highest->cpo;
234 		popts->write_data_delay = pbsp_highest->write_data_delay;
235 		popts->clk_adjust = pbsp_highest->clk_adjust;
236 		popts->wrlvl_start = pbsp_highest->wrlvl_start;
237 		popts->twot_en = pbsp_highest->force_2t;
238 	} else {
239 		panic("DIMM is not supported by this board");
240 	}
241 found:
242 	/*
243 	 * Factors to consider for half-strength driver enable:
244 	 *	- number of DIMMs installed
245 	 */
246 	popts->half_strength_driver_enable = 0;
247 	/*
248 	 * Write leveling override
249 	 */
250 	popts->wrlvl_override = 1;
251 	popts->wrlvl_sample = 0xf;
252 
253 	/*
254 	 * Rtt and Rtt_WR override
255 	 */
256 	popts->rtt_override = 0;
257 
258 	/* Enable ZQ calibration */
259 	popts->zq_en = 1;
260 
261 	/* DHC_EN =1, ODT = 60 Ohm */
262 	popts->ddr_cdr1 = DDR_CDR1_DHC_EN;
263 }
264 
265 phys_size_t initdram(int board_type)
266 {
267 	phys_size_t dram_size;
268 
269 	puts("Initializing....");
270 
271 	if (fsl_use_spd()) {
272 		puts("using SPD\n");
273 		dram_size = fsl_ddr_sdram();
274 	} else {
275 		puts("using fixed parameters\n");
276 		dram_size = fixed_sdram();
277 	}
278 
279 	dram_size = setup_ddr_tlbs(dram_size / 0x100000);
280 	dram_size *= 0x100000;
281 
282 	debug("    DDR: ");
283 	return dram_size;
284 }
285