summaryrefslogtreecommitdiff
path: root/arch/powerpc/cpu/mpc8xxx/ddr/main.c
blob: faa1af95ef1aa29d8a65ddaa04e37fa763d72c77 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
/*
 * Copyright 2008 Freescale Semiconductor, Inc.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * Version 2 as published by the Free Software Foundation.
 */

/*
 * Generic driver for Freescale DDR/DDR2/DDR3 memory controller.
 * Based on code from spd_sdram.c
 * Author: James Yang [at freescale.com]
 */

#include <common.h>
#include <asm/fsl_ddr_sdram.h>

#include "ddr.h"

extern void fsl_ddr_set_lawbar(
		const common_timing_params_t *memctl_common_params,
		unsigned int memctl_interleaved,
		unsigned int ctrl_num);

/* processor specific function */
extern void fsl_ddr_set_memctl_regs(const fsl_ddr_cfg_regs_t *regs,
				   unsigned int ctrl_num);

/* Board-specific functions defined in each board's ddr.c */
extern void fsl_ddr_get_spd(generic_spd_eeprom_t *ctrl_dimms_spd,
			   unsigned int ctrl_num);

/*
 * ASSUMPTIONS:
 *    - Same number of CONFIG_DIMM_SLOTS_PER_CTLR on each controller
 *    - Same memory data bus width on all controllers
 *
 * NOTES:
 *
 * The memory controller and associated documentation use confusing
 * terminology when referring to the orgranization of DRAM.
 *
 * Here is a terminology translation table:
 *
 * memory controller/documention  |industry   |this code  |signals
 * -------------------------------|-----------|-----------|-----------------
 * physical bank/bank		  |rank       |rank	  |chip select (CS)
 * logical bank/sub-bank	  |bank       |bank	  |bank address (BA)
 * page/row			  |row	      |page	  |row address
 * ???				  |column     |column	  |column address
 *
 * The naming confusion is further exacerbated by the descriptions of the
 * memory controller interleaving feature, where accesses are interleaved
 * _BETWEEN_ two seperate memory controllers.  This is configured only in
 * CS0_CONFIG[INTLV_CTL] of each memory controller.
 *
 * memory controller documentation | number of chip selects
 *				   | per memory controller supported
 * --------------------------------|-----------------------------------------
 * cache line interleaving	   | 1 (CS0 only)
 * page interleaving		   | 1 (CS0 only)
 * bank interleaving		   | 1 (CS0 only)
 * superbank interleraving	   | depends on bank (chip select)
 *				   |   interleraving [rank interleaving]
 *				   |   mode used on every memory controller
 *
 * Even further confusing is the existence of the interleaving feature
 * _WITHIN_ each memory controller.  The feature is referred to in
 * documentation as chip select interleaving or bank interleaving,
 * although it is configured in the DDR_SDRAM_CFG field.
 *
 * Name of field		| documentation name	| this code
 * -----------------------------|-----------------------|------------------
 * DDR_SDRAM_CFG[BA_INTLV_CTL]	| Bank (chip select)	| rank interleaving
 *				|  interleaving
 */

#ifdef DEBUG
const char *step_string_tbl[] = {
	"STEP_GET_SPD",
	"STEP_COMPUTE_DIMM_PARMS",
	"STEP_COMPUTE_COMMON_PARMS",
	"STEP_GATHER_OPTS",
	"STEP_ASSIGN_ADDRESSES",
	"STEP_COMPUTE_REGS",
	"STEP_PROGRAM_REGS",
	"STEP_ALL"
};

const char * step_to_string(unsigned int step) {

	unsigned int s = __ilog2(step);

	if ((1 << s) != step)
		return step_string_tbl[7];

	return step_string_tbl[s];
}
#endif

int step_assign_addresses(fsl_ddr_info_t *pinfo,
			  unsigned int dbw_cap_adj[],
			  unsigned int *memctl_interleaving,
			  unsigned int *rank_interleaving)
{
	int i, j;

	/*
	 * If a reduced data width is requested, but the SPD
	 * specifies a physically wider device, adjust the
	 * computed dimm capacities accordingly before
	 * assigning addresses.
	 */
	for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) {
		unsigned int found = 0;

		switch (pinfo->memctl_opts[i].data_bus_width) {
		case 2:
			/* 16-bit */
			printf("can't handle 16-bit mode yet\n");
			break;

		case 1:
			/* 32-bit */
			for (j = 0; j < CONFIG_DIMM_SLOTS_PER_CTLR; j++) {
				unsigned int dw;
				dw = pinfo->dimm_params[i][j].data_width;
				if (pinfo->dimm_params[i][j].n_ranks
				    && (dw == 72 || dw == 64)) {
					/*
					 * FIXME: can't really do it
					 * like this because this just
					 * further reduces the memory
					 */
					found = 1;
					break;
				}
			}
			if (found) {
				dbw_cap_adj[i] = 1;
			}
			break;

		case 0:
			/* 64-bit */
			break;

		default:
			printf("unexpected data bus width "
				"specified controller %u\n", i);
			return 1;
		}
	}

	/*
	 * Check if all controllers are configured for memory
	 * controller interleaving.
	 */
	j = 0;
	for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) {
		if (pinfo->memctl_opts[i].memctl_interleaving) {
			j++;
		}
	}
	if (j == 2)
		*memctl_interleaving = 1;

	/* Check that all controllers are rank interleaving. */
	j = 0;
	for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) {
		if (pinfo->memctl_opts[i].ba_intlv_ctl) {
			j++;
		}
	}
	if (j == 2)
		*rank_interleaving = 1;

	if (*memctl_interleaving) {
		unsigned long long addr, total_mem_per_ctlr = 0;
		/*
		 * If interleaving between memory controllers,
		 * make each controller start at a base address
		 * of 0.
		 *
		 * Also, if bank interleaving (chip select
		 * interleaving) is enabled on each memory
		 * controller, CS0 needs to be programmed to
		 * cover the entire memory range on that memory
		 * controller
		 *
		 * Bank interleaving also implies that each
		 * addressed chip select is identical in size.
		 */

		for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) {
			addr = 0;
			pinfo->common_timing_params[i].base_address = 0ull;
			for (j = 0; j < CONFIG_DIMM_SLOTS_PER_CTLR; j++) {
				unsigned long long cap
					= pinfo->dimm_params[i][j].capacity;

				pinfo->dimm_params[i][j].base_address = addr;
				addr += cap >> dbw_cap_adj[i];
				total_mem_per_ctlr += cap >> dbw_cap_adj[i];
			}
		}
		pinfo->common_timing_params[0].total_mem = total_mem_per_ctlr;
	} else {
		/*
		 * Simple linear assignment if memory
		 * controllers are not interleaved.
		 */
		unsigned long long cur_memsize = 0;
		for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) {
			u64 total_mem_per_ctlr = 0;
			pinfo->common_timing_params[i].base_address =
						cur_memsize;
			for (j = 0; j < CONFIG_DIMM_SLOTS_PER_CTLR; j++) {
				/* Compute DIMM base addresses. */
				unsigned long long cap =
					pinfo->dimm_params[i][j].capacity;
				pinfo->dimm_params[i][j].base_address =
					cur_memsize;
				cur_memsize += cap >> dbw_cap_adj[i];
				total_mem_per_ctlr += cap >> dbw_cap_adj[i];
			}
			pinfo->common_timing_params[i].total_mem =
							total_mem_per_ctlr;
		}
	}

	return 0;
}

unsigned long long
fsl_ddr_compute(fsl_ddr_info_t *pinfo, unsigned int start_step)
{
	unsigned int i, j;
	unsigned int all_controllers_memctl_interleaving = 0;
	unsigned int all_controllers_rank_interleaving = 0;
	unsigned long long total_mem = 0;

	fsl_ddr_cfg_regs_t *ddr_reg = pinfo->fsl_ddr_config_reg;
	common_timing_params_t *timing_params = pinfo->common_timing_params;

	/* data bus width capacity adjust shift amount */
	unsigned int dbw_capacity_adjust[CONFIG_NUM_DDR_CONTROLLERS];

	for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) {
		dbw_capacity_adjust[i] = 0;
	}

	debug("starting at step %u (%s)\n",
	      start_step, step_to_string(start_step));

	switch (start_step) {
	case STEP_GET_SPD:
		/* STEP 1:  Gather all DIMM SPD data */
		for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) {
			fsl_ddr_get_spd(pinfo->spd_installed_dimms[i], i);
		}

	case STEP_COMPUTE_DIMM_PARMS:
		/* STEP 2:  Compute DIMM parameters from SPD data */

		for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) {
			for (j = 0; j < CONFIG_DIMM_SLOTS_PER_CTLR; j++) {
				unsigned int retval;
				generic_spd_eeprom_t *spd =
					&(pinfo->spd_installed_dimms[i][j]);
				dimm_params_t *pdimm =
					&(pinfo->dimm_params[i][j]);

				retval = compute_dimm_parameters(spd, pdimm, i);
				if (retval == 2) {
					printf("Error: compute_dimm_parameters"
					" non-zero returned FATAL value "
					"for memctl=%u dimm=%u\n", i, j);
					return 0;
				}
				if (retval) {
					debug("Warning: compute_dimm_parameters"
					" non-zero return value for memctl=%u "
					"dimm=%u\n", i, j);
				}
			}
		}

	case STEP_COMPUTE_COMMON_PARMS:
		/*
		 * STEP 3: Compute a common set of timing parameters
		 * suitable for all of the DIMMs on each memory controller
		 */
		for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) {
			debug("Computing lowest common DIMM"
				" parameters for memctl=%u\n", i);
			compute_lowest_common_dimm_parameters(
				pinfo->dimm_params[i],
				&timing_params[i],
				CONFIG_DIMM_SLOTS_PER_CTLR);
		}

	case STEP_GATHER_OPTS:
		/* STEP 4:  Gather configuration requirements from user */
		for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) {
			debug("Reloading memory controller "
				"configuration options for memctl=%u\n", i);
			/*
			 * This "reloads" the memory controller options
			 * to defaults.  If the user "edits" an option,
			 * next_step points to the step after this,
			 * which is currently STEP_ASSIGN_ADDRESSES.
			 */
			populate_memctl_options(
					timing_params[i].all_DIMMs_registered,
					&pinfo->memctl_opts[i],
					pinfo->dimm_params[i], i);
		}

	case STEP_ASSIGN_ADDRESSES:
		/* STEP 5:  Assign addresses to chip selects */
		step_assign_addresses(pinfo,
				dbw_capacity_adjust,
				&all_controllers_memctl_interleaving,
				&all_controllers_rank_interleaving);

	case STEP_COMPUTE_REGS:
		/* STEP 6:  compute controller register values */
		debug("FSL Memory ctrl cg register computation\n");
		for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) {
			if (timing_params[i].ndimms_present == 0) {
				memset(&ddr_reg[i], 0,
					sizeof(fsl_ddr_cfg_regs_t));
				continue;
			}

			compute_fsl_memctl_config_regs(
					&pinfo->memctl_opts[i],
					&ddr_reg[i], &timing_params[i],
					pinfo->dimm_params[i],
					dbw_capacity_adjust[i]);
		}

	default:
		break;
	}

	/* Compute the total amount of memory. */

	/*
	 * If bank interleaving but NOT memory controller interleaving
	 * CS_BNDS describe the quantity of memory on each memory
	 * controller, so the total is the sum across.
	 */
	if (!all_controllers_memctl_interleaving
	    && all_controllers_rank_interleaving) {
		total_mem = 0;
		for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) {
			total_mem += timing_params[i].total_mem;
		}

	} else {
		/*
		 * Compute the amount of memory available just by
		 * looking for the highest valid CSn_BNDS value.
		 * This allows us to also experiment with using
		 * only CS0 when using dual-rank DIMMs.
		 */
		unsigned int max_end = 0;

		for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) {
			for (j = 0; j < CONFIG_CHIP_SELECTS_PER_CTRL; j++) {
				fsl_ddr_cfg_regs_t *reg = &ddr_reg[i];
				if (reg->cs[j].config & 0x80000000) {
					unsigned int end;
					end = reg->cs[j].bnds & 0xFFF;
					if (end > max_end) {
						max_end = end;
					}
				}
			}
		}

		total_mem = 1 + (((unsigned long long)max_end << 24ULL)
				    | 0xFFFFFFULL);
	}

	return total_mem;
}

/*
 * fsl_ddr_sdram() -- this is the main function to be called by
 *	initdram() in the board file.
 *
 * It returns amount of memory configured in bytes.
 */
phys_size_t fsl_ddr_sdram(void)
{
	unsigned int i;
	unsigned int memctl_interleaved;
	unsigned long long total_memory;
	fsl_ddr_info_t info;

	/* Reset info structure. */
	memset(&info, 0, sizeof(fsl_ddr_info_t));

	/* Compute it once normally. */
	total_memory = fsl_ddr_compute(&info, STEP_GET_SPD);

	/* Check for memory controller interleaving. */
	memctl_interleaved = 0;
	for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) {
		memctl_interleaved +=
			info.memctl_opts[i].memctl_interleaving;
	}

	if (memctl_interleaved) {
		if (memctl_interleaved == CONFIG_NUM_DDR_CONTROLLERS) {
			debug("memctl interleaving\n");
			/*
			 * Change the meaning of memctl_interleaved
			 * to be "boolean".
			 */
			memctl_interleaved = 1;
		} else {
			printf("Warning: memctl interleaving not "
				"properly configured on all controllers\n");
			memctl_interleaved = 0;
			for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++)
				info.memctl_opts[i].memctl_interleaving = 0;
			debug("Recomputing with memctl_interleaving off.\n");
			total_memory = fsl_ddr_compute(&info,
						       STEP_ASSIGN_ADDRESSES);
		}
	}

	/* Program configuration registers. */
	for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) {
		debug("Programming controller %u\n", i);
		if (info.common_timing_params[i].ndimms_present == 0) {
			debug("No dimms present on controller %u; "
					"skipping programming\n", i);
			continue;
		}

		fsl_ddr_set_memctl_regs(&(info.fsl_ddr_config_reg[i]), i);
	}

	if (memctl_interleaved) {
		const unsigned int ctrl_num = 0;

		/* Only set LAWBAR1 if memory controller interleaving is on. */
		fsl_ddr_set_lawbar(&info.common_timing_params[0],
					 memctl_interleaved, ctrl_num);
	} else {
		/*
		 * Memory controller interleaving is NOT on;
		 * set each lawbar individually.
		 */
		for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) {
			fsl_ddr_set_lawbar(&info.common_timing_params[i],
						 0, i);
		}
	}

	debug("total_memory = %llu\n", total_memory);

#if !defined(CONFIG_PHYS_64BIT)
	/* Check for 4G or more.  Bad. */
	if (total_memory >= (1ull << 32)) {
		printf("Detected %lld MB of memory\n", total_memory >> 20);
		printf("This U-Boot only supports < 4G of DDR\n");
		printf("You could rebuild it with CONFIG_PHYS_64BIT\n");
		total_memory = CONFIG_MAX_MEM_MAPPED;
	}
#endif

	return total_memory;
}