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
|
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* OpenFirmware helpers for memory drivers
*
* Copyright (C) 2012 Texas Instruments, Inc.
* Copyright (C) 2019 Samsung Electronics Co., Ltd.
* Copyright (C) 2020 Krzysztof Kozlowski <krzk@kernel.org>
*/
#include <linux/device.h>
#include <linux/of.h>
#include <linux/gfp.h>
#include <linux/export.h>
#include "jedec_ddr.h"
#include "of_memory.h"
/**
* of_get_min_tck() - extract min timing values for ddr
* @np: pointer to ddr device tree node
* @dev: device requesting for min timing values
*
* Populates the lpddr2_min_tck structure by extracting data
* from device tree node. Returns a pointer to the populated
* structure. If any error in populating the structure, returns
* default min timings provided by JEDEC.
*/
const struct lpddr2_min_tck *of_get_min_tck(struct device_node *np,
struct device *dev)
{
int ret = 0;
struct lpddr2_min_tck *min;
min = devm_kzalloc(dev, sizeof(*min), GFP_KERNEL);
if (!min)
goto default_min_tck;
ret |= of_property_read_u32(np, "tRPab-min-tck", &min->tRPab);
ret |= of_property_read_u32(np, "tRCD-min-tck", &min->tRCD);
ret |= of_property_read_u32(np, "tWR-min-tck", &min->tWR);
ret |= of_property_read_u32(np, "tRASmin-min-tck", &min->tRASmin);
ret |= of_property_read_u32(np, "tRRD-min-tck", &min->tRRD);
ret |= of_property_read_u32(np, "tWTR-min-tck", &min->tWTR);
ret |= of_property_read_u32(np, "tXP-min-tck", &min->tXP);
ret |= of_property_read_u32(np, "tRTP-min-tck", &min->tRTP);
ret |= of_property_read_u32(np, "tCKE-min-tck", &min->tCKE);
ret |= of_property_read_u32(np, "tCKESR-min-tck", &min->tCKESR);
ret |= of_property_read_u32(np, "tFAW-min-tck", &min->tFAW);
if (ret) {
devm_kfree(dev, min);
goto default_min_tck;
}
return min;
default_min_tck:
dev_warn(dev, "Using default min-tck values\n");
return &lpddr2_jedec_min_tck;
}
EXPORT_SYMBOL(of_get_min_tck);
static int of_do_get_timings(struct device_node *np,
struct lpddr2_timings *tim)
{
int ret;
ret = of_property_read_u32(np, "max-freq", &tim->max_freq);
ret |= of_property_read_u32(np, "min-freq", &tim->min_freq);
ret |= of_property_read_u32(np, "tRPab", &tim->tRPab);
ret |= of_property_read_u32(np, "tRCD", &tim->tRCD);
ret |= of_property_read_u32(np, "tWR", &tim->tWR);
ret |= of_property_read_u32(np, "tRAS-min", &tim->tRAS_min);
ret |= of_property_read_u32(np, "tRRD", &tim->tRRD);
ret |= of_property_read_u32(np, "tWTR", &tim->tWTR);
ret |= of_property_read_u32(np, "tXP", &tim->tXP);
ret |= of_property_read_u32(np, "tRTP", &tim->tRTP);
ret |= of_property_read_u32(np, "tCKESR", &tim->tCKESR);
ret |= of_property_read_u32(np, "tDQSCK-max", &tim->tDQSCK_max);
ret |= of_property_read_u32(np, "tFAW", &tim->tFAW);
ret |= of_property_read_u32(np, "tZQCS", &tim->tZQCS);
ret |= of_property_read_u32(np, "tZQCL", &tim->tZQCL);
ret |= of_property_read_u32(np, "tZQinit", &tim->tZQinit);
ret |= of_property_read_u32(np, "tRAS-max-ns", &tim->tRAS_max_ns);
ret |= of_property_read_u32(np, "tDQSCK-max-derated",
&tim->tDQSCK_max_derated);
return ret;
}
/**
* of_get_ddr_timings() - extracts the ddr timings and updates no of
* frequencies available.
* @np_ddr: Pointer to ddr device tree node
* @dev: Device requesting for ddr timings
* @device_type: Type of ddr(LPDDR2 S2/S4)
* @nr_frequencies: No of frequencies available for ddr
* (updated by this function)
*
* Populates lpddr2_timings structure by extracting data from device
* tree node. Returns pointer to populated structure. If any error
* while populating, returns default timings provided by JEDEC.
*/
const struct lpddr2_timings *of_get_ddr_timings(struct device_node *np_ddr,
struct device *dev,
u32 device_type,
u32 *nr_frequencies)
{
struct lpddr2_timings *timings = NULL;
u32 arr_sz = 0, i = 0;
struct device_node *np_tim;
char *tim_compat = NULL;
switch (device_type) {
case DDR_TYPE_LPDDR2_S2:
case DDR_TYPE_LPDDR2_S4:
tim_compat = "jedec,lpddr2-timings";
break;
default:
dev_warn(dev, "Unsupported memory type\n");
}
for_each_child_of_node(np_ddr, np_tim)
if (of_device_is_compatible(np_tim, tim_compat))
arr_sz++;
if (arr_sz)
timings = devm_kcalloc(dev, arr_sz, sizeof(*timings),
GFP_KERNEL);
if (!timings)
goto default_timings;
for_each_child_of_node(np_ddr, np_tim) {
if (of_device_is_compatible(np_tim, tim_compat)) {
if (of_do_get_timings(np_tim, &timings[i])) {
devm_kfree(dev, timings);
goto default_timings;
}
i++;
}
}
*nr_frequencies = arr_sz;
return timings;
default_timings:
dev_warn(dev, "Using default memory timings\n");
*nr_frequencies = ARRAY_SIZE(lpddr2_jedec_timings);
return lpddr2_jedec_timings;
}
EXPORT_SYMBOL(of_get_ddr_timings);
/**
* of_lpddr3_get_min_tck() - extract min timing values for lpddr3
* @np: pointer to ddr device tree node
* @dev: device requesting for min timing values
*
* Populates the lpddr3_min_tck structure by extracting data
* from device tree node. Returns a pointer to the populated
* structure. If any error in populating the structure, returns NULL.
*/
const struct lpddr3_min_tck *of_lpddr3_get_min_tck(struct device_node *np,
struct device *dev)
{
int ret = 0;
struct lpddr3_min_tck *min;
min = devm_kzalloc(dev, sizeof(*min), GFP_KERNEL);
if (!min)
goto default_min_tck;
ret |= of_property_read_u32(np, "tRFC-min-tck", &min->tRFC);
ret |= of_property_read_u32(np, "tRRD-min-tck", &min->tRRD);
ret |= of_property_read_u32(np, "tRPab-min-tck", &min->tRPab);
ret |= of_property_read_u32(np, "tRPpb-min-tck", &min->tRPpb);
ret |= of_property_read_u32(np, "tRCD-min-tck", &min->tRCD);
ret |= of_property_read_u32(np, "tRC-min-tck", &min->tRC);
ret |= of_property_read_u32(np, "tRAS-min-tck", &min->tRAS);
ret |= of_property_read_u32(np, "tWTR-min-tck", &min->tWTR);
ret |= of_property_read_u32(np, "tWR-min-tck", &min->tWR);
ret |= of_property_read_u32(np, "tRTP-min-tck", &min->tRTP);
ret |= of_property_read_u32(np, "tW2W-C2C-min-tck", &min->tW2W_C2C);
ret |= of_property_read_u32(np, "tR2R-C2C-min-tck", &min->tR2R_C2C);
ret |= of_property_read_u32(np, "tWL-min-tck", &min->tWL);
ret |= of_property_read_u32(np, "tDQSCK-min-tck", &min->tDQSCK);
ret |= of_property_read_u32(np, "tRL-min-tck", &min->tRL);
ret |= of_property_read_u32(np, "tFAW-min-tck", &min->tFAW);
ret |= of_property_read_u32(np, "tXSR-min-tck", &min->tXSR);
ret |= of_property_read_u32(np, "tXP-min-tck", &min->tXP);
ret |= of_property_read_u32(np, "tCKE-min-tck", &min->tCKE);
ret |= of_property_read_u32(np, "tCKESR-min-tck", &min->tCKESR);
ret |= of_property_read_u32(np, "tMRD-min-tck", &min->tMRD);
if (ret) {
dev_warn(dev, "Errors while parsing min-tck values\n");
devm_kfree(dev, min);
goto default_min_tck;
}
return min;
default_min_tck:
dev_warn(dev, "Using default min-tck values\n");
return NULL;
}
EXPORT_SYMBOL(of_lpddr3_get_min_tck);
static int of_lpddr3_do_get_timings(struct device_node *np,
struct lpddr3_timings *tim)
{
int ret;
/* The 'reg' param required since DT has changed, used as 'max-freq' */
ret = of_property_read_u32(np, "reg", &tim->max_freq);
ret |= of_property_read_u32(np, "min-freq", &tim->min_freq);
ret |= of_property_read_u32(np, "tRFC", &tim->tRFC);
ret |= of_property_read_u32(np, "tRRD", &tim->tRRD);
ret |= of_property_read_u32(np, "tRPab", &tim->tRPab);
ret |= of_property_read_u32(np, "tRPpb", &tim->tRPpb);
ret |= of_property_read_u32(np, "tRCD", &tim->tRCD);
ret |= of_property_read_u32(np, "tRC", &tim->tRC);
ret |= of_property_read_u32(np, "tRAS", &tim->tRAS);
ret |= of_property_read_u32(np, "tWTR", &tim->tWTR);
ret |= of_property_read_u32(np, "tWR", &tim->tWR);
ret |= of_property_read_u32(np, "tRTP", &tim->tRTP);
ret |= of_property_read_u32(np, "tW2W-C2C", &tim->tW2W_C2C);
ret |= of_property_read_u32(np, "tR2R-C2C", &tim->tR2R_C2C);
ret |= of_property_read_u32(np, "tFAW", &tim->tFAW);
ret |= of_property_read_u32(np, "tXSR", &tim->tXSR);
ret |= of_property_read_u32(np, "tXP", &tim->tXP);
ret |= of_property_read_u32(np, "tCKE", &tim->tCKE);
ret |= of_property_read_u32(np, "tCKESR", &tim->tCKESR);
ret |= of_property_read_u32(np, "tMRD", &tim->tMRD);
return ret;
}
/**
* of_lpddr3_get_ddr_timings() - extracts the lpddr3 timings and updates no of
* frequencies available.
* @np_ddr: Pointer to ddr device tree node
* @dev: Device requesting for ddr timings
* @device_type: Type of ddr
* @nr_frequencies: No of frequencies available for ddr
* (updated by this function)
*
* Populates lpddr3_timings structure by extracting data from device
* tree node. Returns pointer to populated structure. If any error
* while populating, returns NULL.
*/
const struct lpddr3_timings
*of_lpddr3_get_ddr_timings(struct device_node *np_ddr, struct device *dev,
u32 device_type, u32 *nr_frequencies)
{
struct lpddr3_timings *timings = NULL;
u32 arr_sz = 0, i = 0;
struct device_node *np_tim;
char *tim_compat = NULL;
switch (device_type) {
case DDR_TYPE_LPDDR3:
tim_compat = "jedec,lpddr3-timings";
break;
default:
dev_warn(dev, "Unsupported memory type\n");
}
for_each_child_of_node(np_ddr, np_tim)
if (of_device_is_compatible(np_tim, tim_compat))
arr_sz++;
if (arr_sz)
timings = devm_kcalloc(dev, arr_sz, sizeof(*timings),
GFP_KERNEL);
if (!timings)
goto default_timings;
for_each_child_of_node(np_ddr, np_tim) {
if (of_device_is_compatible(np_tim, tim_compat)) {
if (of_lpddr3_do_get_timings(np_tim, &timings[i])) {
devm_kfree(dev, timings);
goto default_timings;
}
i++;
}
}
*nr_frequencies = arr_sz;
return timings;
default_timings:
dev_warn(dev, "Failed to get timings\n");
*nr_frequencies = 0;
return NULL;
}
EXPORT_SYMBOL(of_lpddr3_get_ddr_timings);
/**
* of_lpddr2_get_info() - extracts information about the lpddr2 chip.
* @np: Pointer to device tree node containing lpddr2 info
* @dev: Device requesting info
*
* Populates lpddr2_info structure by extracting data from device
* tree node. Returns pointer to populated structure. If error
* happened while populating, returns NULL. If property is missing
* in a device-tree, then the corresponding value is set to -ENOENT.
*/
const struct lpddr2_info
*of_lpddr2_get_info(struct device_node *np, struct device *dev)
{
struct lpddr2_info *ret_info, info = {};
struct property *prop;
const char *cp;
int err;
err = of_property_read_u32(np, "revision-id1", &info.revision_id1);
if (err)
info.revision_id1 = -ENOENT;
err = of_property_read_u32(np, "revision-id2", &info.revision_id2);
if (err)
info.revision_id2 = -ENOENT;
err = of_property_read_u32(np, "io-width", &info.io_width);
if (err)
return NULL;
info.io_width = 32 / info.io_width - 1;
err = of_property_read_u32(np, "density", &info.density);
if (err)
return NULL;
info.density = ffs(info.density) - 7;
if (of_device_is_compatible(np, "jedec,lpddr2-s4"))
info.arch_type = LPDDR2_TYPE_S4;
else if (of_device_is_compatible(np, "jedec,lpddr2-s2"))
info.arch_type = LPDDR2_TYPE_S2;
else if (of_device_is_compatible(np, "jedec,lpddr2-nvm"))
info.arch_type = LPDDR2_TYPE_NVM;
else
return NULL;
prop = of_find_property(np, "compatible", NULL);
for (cp = of_prop_next_string(prop, NULL); cp;
cp = of_prop_next_string(prop, cp)) {
#define OF_LPDDR2_VENDOR_CMP(compat, ID) \
if (!of_compat_cmp(cp, compat ",", strlen(compat ","))) { \
info.manufacturer_id = LPDDR2_MANID_##ID; \
break; \
}
OF_LPDDR2_VENDOR_CMP("samsung", SAMSUNG)
OF_LPDDR2_VENDOR_CMP("qimonda", QIMONDA)
OF_LPDDR2_VENDOR_CMP("elpida", ELPIDA)
OF_LPDDR2_VENDOR_CMP("etron", ETRON)
OF_LPDDR2_VENDOR_CMP("nanya", NANYA)
OF_LPDDR2_VENDOR_CMP("hynix", HYNIX)
OF_LPDDR2_VENDOR_CMP("mosel", MOSEL)
OF_LPDDR2_VENDOR_CMP("winbond", WINBOND)
OF_LPDDR2_VENDOR_CMP("esmt", ESMT)
OF_LPDDR2_VENDOR_CMP("spansion", SPANSION)
OF_LPDDR2_VENDOR_CMP("sst", SST)
OF_LPDDR2_VENDOR_CMP("zmos", ZMOS)
OF_LPDDR2_VENDOR_CMP("intel", INTEL)
OF_LPDDR2_VENDOR_CMP("numonyx", NUMONYX)
OF_LPDDR2_VENDOR_CMP("micron", MICRON)
#undef OF_LPDDR2_VENDOR_CMP
}
if (!info.manufacturer_id)
info.manufacturer_id = -ENOENT;
ret_info = devm_kzalloc(dev, sizeof(*ret_info), GFP_KERNEL);
if (ret_info)
*ret_info = info;
return ret_info;
}
EXPORT_SYMBOL(of_lpddr2_get_info);
|
