1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * OpenFirmware helpers for memory drivers
4 *
5 * Copyright (C) 2012 Texas Instruments, Inc.
6 * Copyright (C) 2019 Samsung Electronics Co., Ltd.
7 * Copyright (C) 2020 Krzysztof Kozlowski <krzk@kernel.org>
8 */
9
10#include <linux/device.h>
11#include <linux/of.h>
12#include <linux/gfp.h>
13#include <linux/export.h>
14
15#include "jedec_ddr.h"
16#include "of_memory.h"
17
18/**
19 * of_get_min_tck() - extract min timing values for ddr
20 * @np: pointer to ddr device tree node
21 * @dev: device requesting for min timing values
22 *
23 * Populates the lpddr2_min_tck structure by extracting data
24 * from device tree node. Returns a pointer to the populated
25 * structure. If any error in populating the structure, returns
26 * default min timings provided by JEDEC.
27 */
28const struct lpddr2_min_tck *of_get_min_tck(struct device_node *np,
29 struct device *dev)
30{
31 int ret = 0;
32 struct lpddr2_min_tck *min;
33
34 min = devm_kzalloc(dev, size: sizeof(*min), GFP_KERNEL);
35 if (!min)
36 goto default_min_tck;
37
38 ret |= of_property_read_u32(np, propname: "tRPab-min-tck", out_value: &min->tRPab);
39 ret |= of_property_read_u32(np, propname: "tRCD-min-tck", out_value: &min->tRCD);
40 ret |= of_property_read_u32(np, propname: "tWR-min-tck", out_value: &min->tWR);
41 ret |= of_property_read_u32(np, propname: "tRASmin-min-tck", out_value: &min->tRASmin);
42 ret |= of_property_read_u32(np, propname: "tRRD-min-tck", out_value: &min->tRRD);
43 ret |= of_property_read_u32(np, propname: "tWTR-min-tck", out_value: &min->tWTR);
44 ret |= of_property_read_u32(np, propname: "tXP-min-tck", out_value: &min->tXP);
45 ret |= of_property_read_u32(np, propname: "tRTP-min-tck", out_value: &min->tRTP);
46 ret |= of_property_read_u32(np, propname: "tCKE-min-tck", out_value: &min->tCKE);
47 ret |= of_property_read_u32(np, propname: "tCKESR-min-tck", out_value: &min->tCKESR);
48 ret |= of_property_read_u32(np, propname: "tFAW-min-tck", out_value: &min->tFAW);
49
50 if (ret) {
51 devm_kfree(dev, p: min);
52 goto default_min_tck;
53 }
54
55 return min;
56
57default_min_tck:
58 dev_warn(dev, "Using default min-tck values\n");
59 return &lpddr2_jedec_min_tck;
60}
61EXPORT_SYMBOL(of_get_min_tck);
62
63static int of_do_get_timings(struct device_node *np,
64 struct lpddr2_timings *tim)
65{
66 int ret;
67
68 ret = of_property_read_u32(np, propname: "max-freq", out_value: &tim->max_freq);
69 ret |= of_property_read_u32(np, propname: "min-freq", out_value: &tim->min_freq);
70 ret |= of_property_read_u32(np, propname: "tRPab", out_value: &tim->tRPab);
71 ret |= of_property_read_u32(np, propname: "tRCD", out_value: &tim->tRCD);
72 ret |= of_property_read_u32(np, propname: "tWR", out_value: &tim->tWR);
73 ret |= of_property_read_u32(np, propname: "tRAS-min", out_value: &tim->tRAS_min);
74 ret |= of_property_read_u32(np, propname: "tRRD", out_value: &tim->tRRD);
75 ret |= of_property_read_u32(np, propname: "tWTR", out_value: &tim->tWTR);
76 ret |= of_property_read_u32(np, propname: "tXP", out_value: &tim->tXP);
77 ret |= of_property_read_u32(np, propname: "tRTP", out_value: &tim->tRTP);
78 ret |= of_property_read_u32(np, propname: "tCKESR", out_value: &tim->tCKESR);
79 ret |= of_property_read_u32(np, propname: "tDQSCK-max", out_value: &tim->tDQSCK_max);
80 ret |= of_property_read_u32(np, propname: "tFAW", out_value: &tim->tFAW);
81 ret |= of_property_read_u32(np, propname: "tZQCS", out_value: &tim->tZQCS);
82 ret |= of_property_read_u32(np, propname: "tZQCL", out_value: &tim->tZQCL);
83 ret |= of_property_read_u32(np, propname: "tZQinit", out_value: &tim->tZQinit);
84 ret |= of_property_read_u32(np, propname: "tRAS-max-ns", out_value: &tim->tRAS_max_ns);
85 ret |= of_property_read_u32(np, propname: "tDQSCK-max-derated",
86 out_value: &tim->tDQSCK_max_derated);
87
88 return ret;
89}
90
91/**
92 * of_get_ddr_timings() - extracts the ddr timings and updates no of
93 * frequencies available.
94 * @np_ddr: Pointer to ddr device tree node
95 * @dev: Device requesting for ddr timings
96 * @device_type: Type of ddr(LPDDR2 S2/S4)
97 * @nr_frequencies: No of frequencies available for ddr
98 * (updated by this function)
99 *
100 * Populates lpddr2_timings structure by extracting data from device
101 * tree node. Returns pointer to populated structure. If any error
102 * while populating, returns default timings provided by JEDEC.
103 */
104const struct lpddr2_timings *of_get_ddr_timings(struct device_node *np_ddr,
105 struct device *dev,
106 u32 device_type,
107 u32 *nr_frequencies)
108{
109 struct lpddr2_timings *timings = NULL;
110 u32 arr_sz = 0, i = 0;
111 struct device_node *np_tim;
112 char *tim_compat = NULL;
113
114 switch (device_type) {
115 case DDR_TYPE_LPDDR2_S2:
116 case DDR_TYPE_LPDDR2_S4:
117 tim_compat = "jedec,lpddr2-timings";
118 break;
119 default:
120 dev_warn(dev, "Unsupported memory type\n");
121 }
122
123 for_each_child_of_node(np_ddr, np_tim)
124 if (of_device_is_compatible(device: np_tim, tim_compat))
125 arr_sz++;
126
127 if (arr_sz)
128 timings = devm_kcalloc(dev, n: arr_sz, size: sizeof(*timings),
129 GFP_KERNEL);
130
131 if (!timings)
132 goto default_timings;
133
134 for_each_child_of_node(np_ddr, np_tim) {
135 if (of_device_is_compatible(device: np_tim, tim_compat)) {
136 if (of_do_get_timings(np: np_tim, tim: &timings[i])) {
137 of_node_put(node: np_tim);
138 devm_kfree(dev, p: timings);
139 goto default_timings;
140 }
141 i++;
142 }
143 }
144
145 *nr_frequencies = arr_sz;
146
147 return timings;
148
149default_timings:
150 dev_warn(dev, "Using default memory timings\n");
151 *nr_frequencies = ARRAY_SIZE(lpddr2_jedec_timings);
152 return lpddr2_jedec_timings;
153}
154EXPORT_SYMBOL(of_get_ddr_timings);
155
156/**
157 * of_lpddr3_get_min_tck() - extract min timing values for lpddr3
158 * @np: pointer to ddr device tree node
159 * @dev: device requesting for min timing values
160 *
161 * Populates the lpddr3_min_tck structure by extracting data
162 * from device tree node. Returns a pointer to the populated
163 * structure. If any error in populating the structure, returns NULL.
164 */
165const struct lpddr3_min_tck *of_lpddr3_get_min_tck(struct device_node *np,
166 struct device *dev)
167{
168 int ret = 0;
169 struct lpddr3_min_tck *min;
170
171 min = devm_kzalloc(dev, size: sizeof(*min), GFP_KERNEL);
172 if (!min)
173 goto default_min_tck;
174
175 ret |= of_property_read_u32(np, propname: "tRFC-min-tck", out_value: &min->tRFC);
176 ret |= of_property_read_u32(np, propname: "tRRD-min-tck", out_value: &min->tRRD);
177 ret |= of_property_read_u32(np, propname: "tRPab-min-tck", out_value: &min->tRPab);
178 ret |= of_property_read_u32(np, propname: "tRPpb-min-tck", out_value: &min->tRPpb);
179 ret |= of_property_read_u32(np, propname: "tRCD-min-tck", out_value: &min->tRCD);
180 ret |= of_property_read_u32(np, propname: "tRC-min-tck", out_value: &min->tRC);
181 ret |= of_property_read_u32(np, propname: "tRAS-min-tck", out_value: &min->tRAS);
182 ret |= of_property_read_u32(np, propname: "tWTR-min-tck", out_value: &min->tWTR);
183 ret |= of_property_read_u32(np, propname: "tWR-min-tck", out_value: &min->tWR);
184 ret |= of_property_read_u32(np, propname: "tRTP-min-tck", out_value: &min->tRTP);
185 ret |= of_property_read_u32(np, propname: "tW2W-C2C-min-tck", out_value: &min->tW2W_C2C);
186 ret |= of_property_read_u32(np, propname: "tR2R-C2C-min-tck", out_value: &min->tR2R_C2C);
187 ret |= of_property_read_u32(np, propname: "tWL-min-tck", out_value: &min->tWL);
188 ret |= of_property_read_u32(np, propname: "tDQSCK-min-tck", out_value: &min->tDQSCK);
189 ret |= of_property_read_u32(np, propname: "tRL-min-tck", out_value: &min->tRL);
190 ret |= of_property_read_u32(np, propname: "tFAW-min-tck", out_value: &min->tFAW);
191 ret |= of_property_read_u32(np, propname: "tXSR-min-tck", out_value: &min->tXSR);
192 ret |= of_property_read_u32(np, propname: "tXP-min-tck", out_value: &min->tXP);
193 ret |= of_property_read_u32(np, propname: "tCKE-min-tck", out_value: &min->tCKE);
194 ret |= of_property_read_u32(np, propname: "tCKESR-min-tck", out_value: &min->tCKESR);
195 ret |= of_property_read_u32(np, propname: "tMRD-min-tck", out_value: &min->tMRD);
196
197 if (ret) {
198 dev_warn(dev, "Errors while parsing min-tck values\n");
199 devm_kfree(dev, p: min);
200 goto default_min_tck;
201 }
202
203 return min;
204
205default_min_tck:
206 dev_warn(dev, "Using default min-tck values\n");
207 return NULL;
208}
209EXPORT_SYMBOL(of_lpddr3_get_min_tck);
210
211static int of_lpddr3_do_get_timings(struct device_node *np,
212 struct lpddr3_timings *tim)
213{
214 int ret;
215
216 ret = of_property_read_u32(np, propname: "max-freq", out_value: &tim->max_freq);
217 if (ret)
218 /* Deprecated way of passing max-freq as 'reg' */
219 ret = of_property_read_u32(np, propname: "reg", out_value: &tim->max_freq);
220 ret |= of_property_read_u32(np, propname: "min-freq", out_value: &tim->min_freq);
221 ret |= of_property_read_u32(np, propname: "tRFC", out_value: &tim->tRFC);
222 ret |= of_property_read_u32(np, propname: "tRRD", out_value: &tim->tRRD);
223 ret |= of_property_read_u32(np, propname: "tRPab", out_value: &tim->tRPab);
224 ret |= of_property_read_u32(np, propname: "tRPpb", out_value: &tim->tRPpb);
225 ret |= of_property_read_u32(np, propname: "tRCD", out_value: &tim->tRCD);
226 ret |= of_property_read_u32(np, propname: "tRC", out_value: &tim->tRC);
227 ret |= of_property_read_u32(np, propname: "tRAS", out_value: &tim->tRAS);
228 ret |= of_property_read_u32(np, propname: "tWTR", out_value: &tim->tWTR);
229 ret |= of_property_read_u32(np, propname: "tWR", out_value: &tim->tWR);
230 ret |= of_property_read_u32(np, propname: "tRTP", out_value: &tim->tRTP);
231 ret |= of_property_read_u32(np, propname: "tW2W-C2C", out_value: &tim->tW2W_C2C);
232 ret |= of_property_read_u32(np, propname: "tR2R-C2C", out_value: &tim->tR2R_C2C);
233 ret |= of_property_read_u32(np, propname: "tFAW", out_value: &tim->tFAW);
234 ret |= of_property_read_u32(np, propname: "tXSR", out_value: &tim->tXSR);
235 ret |= of_property_read_u32(np, propname: "tXP", out_value: &tim->tXP);
236 ret |= of_property_read_u32(np, propname: "tCKE", out_value: &tim->tCKE);
237 ret |= of_property_read_u32(np, propname: "tCKESR", out_value: &tim->tCKESR);
238 ret |= of_property_read_u32(np, propname: "tMRD", out_value: &tim->tMRD);
239
240 return ret;
241}
242
243/**
244 * of_lpddr3_get_ddr_timings() - extracts the lpddr3 timings and updates no of
245 * frequencies available.
246 * @np_ddr: Pointer to ddr device tree node
247 * @dev: Device requesting for ddr timings
248 * @device_type: Type of ddr
249 * @nr_frequencies: No of frequencies available for ddr
250 * (updated by this function)
251 *
252 * Populates lpddr3_timings structure by extracting data from device
253 * tree node. Returns pointer to populated structure. If any error
254 * while populating, returns NULL.
255 */
256const struct lpddr3_timings
257*of_lpddr3_get_ddr_timings(struct device_node *np_ddr, struct device *dev,
258 u32 device_type, u32 *nr_frequencies)
259{
260 struct lpddr3_timings *timings = NULL;
261 u32 arr_sz = 0, i = 0;
262 struct device_node *np_tim;
263 char *tim_compat = NULL;
264
265 switch (device_type) {
266 case DDR_TYPE_LPDDR3:
267 tim_compat = "jedec,lpddr3-timings";
268 break;
269 default:
270 dev_warn(dev, "Unsupported memory type\n");
271 }
272
273 for_each_child_of_node(np_ddr, np_tim)
274 if (of_device_is_compatible(device: np_tim, tim_compat))
275 arr_sz++;
276
277 if (arr_sz)
278 timings = devm_kcalloc(dev, n: arr_sz, size: sizeof(*timings),
279 GFP_KERNEL);
280
281 if (!timings)
282 goto default_timings;
283
284 for_each_child_of_node(np_ddr, np_tim) {
285 if (of_device_is_compatible(device: np_tim, tim_compat)) {
286 if (of_lpddr3_do_get_timings(np: np_tim, tim: &timings[i])) {
287 devm_kfree(dev, p: timings);
288 of_node_put(node: np_tim);
289 goto default_timings;
290 }
291 i++;
292 }
293 }
294
295 *nr_frequencies = arr_sz;
296
297 return timings;
298
299default_timings:
300 dev_warn(dev, "Failed to get timings\n");
301 *nr_frequencies = 0;
302 return NULL;
303}
304EXPORT_SYMBOL(of_lpddr3_get_ddr_timings);
305
306/**
307 * of_lpddr2_get_info() - extracts information about the lpddr2 chip.
308 * @np: Pointer to device tree node containing lpddr2 info
309 * @dev: Device requesting info
310 *
311 * Populates lpddr2_info structure by extracting data from device
312 * tree node. Returns pointer to populated structure. If error
313 * happened while populating, returns NULL. If property is missing
314 * in a device-tree, then the corresponding value is set to -ENOENT.
315 */
316const struct lpddr2_info
317*of_lpddr2_get_info(struct device_node *np, struct device *dev)
318{
319 struct lpddr2_info *ret_info, info = {};
320 struct property *prop;
321 const char *cp;
322 int err;
323 u32 revision_id[2];
324
325 err = of_property_read_u32_array(np, propname: "revision-id", out_values: revision_id, sz: 2);
326 if (!err) {
327 info.revision_id1 = revision_id[0];
328 info.revision_id2 = revision_id[1];
329 } else {
330 err = of_property_read_u32(np, propname: "revision-id1", out_value: &info.revision_id1);
331 if (err)
332 info.revision_id1 = -ENOENT;
333
334 err = of_property_read_u32(np, propname: "revision-id2", out_value: &info.revision_id2);
335 if (err)
336 info.revision_id2 = -ENOENT;
337 }
338
339 err = of_property_read_u32(np, propname: "io-width", out_value: &info.io_width);
340 if (err)
341 return NULL;
342
343 info.io_width = 32 / info.io_width - 1;
344
345 err = of_property_read_u32(np, propname: "density", out_value: &info.density);
346 if (err)
347 return NULL;
348
349 info.density = ffs(info.density) - 7;
350
351 if (of_device_is_compatible(device: np, "jedec,lpddr2-s4"))
352 info.arch_type = LPDDR2_TYPE_S4;
353 else if (of_device_is_compatible(device: np, "jedec,lpddr2-s2"))
354 info.arch_type = LPDDR2_TYPE_S2;
355 else if (of_device_is_compatible(device: np, "jedec,lpddr2-nvm"))
356 info.arch_type = LPDDR2_TYPE_NVM;
357 else
358 return NULL;
359
360 prop = of_find_property(np, name: "compatible", NULL);
361 for (cp = of_prop_next_string(prop, NULL); cp;
362 cp = of_prop_next_string(prop, cur: cp)) {
363
364#define OF_LPDDR2_VENDOR_CMP(compat, ID) \
365 if (!of_compat_cmp(cp, compat ",", strlen(compat ","))) { \
366 info.manufacturer_id = LPDDR2_MANID_##ID; \
367 break; \
368 }
369
370 OF_LPDDR2_VENDOR_CMP("samsung", SAMSUNG)
371 OF_LPDDR2_VENDOR_CMP("qimonda", QIMONDA)
372 OF_LPDDR2_VENDOR_CMP("elpida", ELPIDA)
373 OF_LPDDR2_VENDOR_CMP("etron", ETRON)
374 OF_LPDDR2_VENDOR_CMP("nanya", NANYA)
375 OF_LPDDR2_VENDOR_CMP("hynix", HYNIX)
376 OF_LPDDR2_VENDOR_CMP("mosel", MOSEL)
377 OF_LPDDR2_VENDOR_CMP("winbond", WINBOND)
378 OF_LPDDR2_VENDOR_CMP("esmt", ESMT)
379 OF_LPDDR2_VENDOR_CMP("spansion", SPANSION)
380 OF_LPDDR2_VENDOR_CMP("sst", SST)
381 OF_LPDDR2_VENDOR_CMP("zmos", ZMOS)
382 OF_LPDDR2_VENDOR_CMP("intel", INTEL)
383 OF_LPDDR2_VENDOR_CMP("numonyx", NUMONYX)
384 OF_LPDDR2_VENDOR_CMP("micron", MICRON)
385
386#undef OF_LPDDR2_VENDOR_CMP
387 }
388
389 if (!info.manufacturer_id)
390 info.manufacturer_id = -ENOENT;
391
392 ret_info = devm_kzalloc(dev, size: sizeof(*ret_info), GFP_KERNEL);
393 if (ret_info)
394 *ret_info = info;
395
396 return ret_info;
397}
398EXPORT_SYMBOL(of_lpddr2_get_info);
399

source code of linux/drivers/memory/of_memory.c

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