1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* |
3 | * EBI driver for Atmel chips |
4 | * inspired by the fsl weim bus driver |
5 | * |
6 | * Copyright (C) 2013 Jean-Jacques Hiblot <jjhiblot@traphandler.com> |
7 | */ |
8 | |
9 | #include <linux/clk.h> |
10 | #include <linux/io.h> |
11 | #include <linux/mfd/syscon.h> |
12 | #include <linux/mfd/syscon/atmel-matrix.h> |
13 | #include <linux/mfd/syscon/atmel-smc.h> |
14 | #include <linux/init.h> |
15 | #include <linux/of.h> |
16 | #include <linux/of_platform.h> |
17 | #include <linux/platform_device.h> |
18 | #include <linux/property.h> |
19 | #include <linux/regmap.h> |
20 | #include <soc/at91/atmel-sfr.h> |
21 | |
22 | #define AT91_EBI_NUM_CS 8 |
23 | |
24 | struct atmel_ebi_dev_config { |
25 | int cs; |
26 | struct atmel_smc_cs_conf smcconf; |
27 | }; |
28 | |
29 | struct atmel_ebi; |
30 | |
31 | struct atmel_ebi_dev { |
32 | struct list_head node; |
33 | struct atmel_ebi *ebi; |
34 | u32 mode; |
35 | int numcs; |
36 | struct atmel_ebi_dev_config configs[] __counted_by(numcs); |
37 | }; |
38 | |
39 | struct atmel_ebi_caps { |
40 | unsigned int available_cs; |
41 | unsigned int ebi_csa_offs; |
42 | const char *regmap_name; |
43 | void (*get_config)(struct atmel_ebi_dev *ebid, |
44 | struct atmel_ebi_dev_config *conf); |
45 | int (*xlate_config)(struct atmel_ebi_dev *ebid, |
46 | struct device_node *configs_np, |
47 | struct atmel_ebi_dev_config *conf); |
48 | void (*apply_config)(struct atmel_ebi_dev *ebid, |
49 | struct atmel_ebi_dev_config *conf); |
50 | }; |
51 | |
52 | struct atmel_ebi { |
53 | struct clk *clk; |
54 | struct regmap *regmap; |
55 | struct { |
56 | struct regmap *regmap; |
57 | struct clk *clk; |
58 | const struct atmel_hsmc_reg_layout *layout; |
59 | } smc; |
60 | |
61 | struct device *dev; |
62 | const struct atmel_ebi_caps *caps; |
63 | struct list_head devs; |
64 | }; |
65 | |
66 | struct atmel_smc_timing_xlate { |
67 | const char *name; |
68 | int (*converter)(struct atmel_smc_cs_conf *conf, |
69 | unsigned int shift, unsigned int nycles); |
70 | unsigned int shift; |
71 | }; |
72 | |
73 | #define ATMEL_SMC_SETUP_XLATE(nm, pos) \ |
74 | { .name = nm, .converter = atmel_smc_cs_conf_set_setup, .shift = pos} |
75 | |
76 | #define ATMEL_SMC_PULSE_XLATE(nm, pos) \ |
77 | { .name = nm, .converter = atmel_smc_cs_conf_set_pulse, .shift = pos} |
78 | |
79 | #define ATMEL_SMC_CYCLE_XLATE(nm, pos) \ |
80 | { .name = nm, .converter = atmel_smc_cs_conf_set_cycle, .shift = pos} |
81 | |
82 | static void at91sam9_ebi_get_config(struct atmel_ebi_dev *ebid, |
83 | struct atmel_ebi_dev_config *conf) |
84 | { |
85 | atmel_smc_cs_conf_get(regmap: ebid->ebi->smc.regmap, cs: conf->cs, |
86 | conf: &conf->smcconf); |
87 | } |
88 | |
89 | static void sama5_ebi_get_config(struct atmel_ebi_dev *ebid, |
90 | struct atmel_ebi_dev_config *conf) |
91 | { |
92 | atmel_hsmc_cs_conf_get(regmap: ebid->ebi->smc.regmap, reglayout: ebid->ebi->smc.layout, |
93 | cs: conf->cs, conf: &conf->smcconf); |
94 | } |
95 | |
96 | static const struct atmel_smc_timing_xlate timings_xlate_table[] = { |
97 | ATMEL_SMC_SETUP_XLATE("atmel,smc-ncs-rd-setup-ns" , |
98 | ATMEL_SMC_NCS_RD_SHIFT), |
99 | ATMEL_SMC_SETUP_XLATE("atmel,smc-ncs-wr-setup-ns" , |
100 | ATMEL_SMC_NCS_WR_SHIFT), |
101 | ATMEL_SMC_SETUP_XLATE("atmel,smc-nrd-setup-ns" , ATMEL_SMC_NRD_SHIFT), |
102 | ATMEL_SMC_SETUP_XLATE("atmel,smc-nwe-setup-ns" , ATMEL_SMC_NWE_SHIFT), |
103 | ATMEL_SMC_PULSE_XLATE("atmel,smc-ncs-rd-pulse-ns" , |
104 | ATMEL_SMC_NCS_RD_SHIFT), |
105 | ATMEL_SMC_PULSE_XLATE("atmel,smc-ncs-wr-pulse-ns" , |
106 | ATMEL_SMC_NCS_WR_SHIFT), |
107 | ATMEL_SMC_PULSE_XLATE("atmel,smc-nrd-pulse-ns" , ATMEL_SMC_NRD_SHIFT), |
108 | ATMEL_SMC_PULSE_XLATE("atmel,smc-nwe-pulse-ns" , ATMEL_SMC_NWE_SHIFT), |
109 | ATMEL_SMC_CYCLE_XLATE("atmel,smc-nrd-cycle-ns" , ATMEL_SMC_NRD_SHIFT), |
110 | ATMEL_SMC_CYCLE_XLATE("atmel,smc-nwe-cycle-ns" , ATMEL_SMC_NWE_SHIFT), |
111 | }; |
112 | |
113 | static int atmel_ebi_xslate_smc_timings(struct atmel_ebi_dev *ebid, |
114 | struct device_node *np, |
115 | struct atmel_smc_cs_conf *smcconf) |
116 | { |
117 | unsigned int clk_rate = clk_get_rate(clk: ebid->ebi->clk); |
118 | unsigned int clk_period_ns = NSEC_PER_SEC / clk_rate; |
119 | bool required = false; |
120 | unsigned int ncycles; |
121 | int ret, i; |
122 | u32 val; |
123 | |
124 | ret = of_property_read_u32(np, propname: "atmel,smc-tdf-ns" , out_value: &val); |
125 | if (!ret) { |
126 | required = true; |
127 | ncycles = DIV_ROUND_UP(val, clk_period_ns); |
128 | if (ncycles > ATMEL_SMC_MODE_TDF_MAX) { |
129 | ret = -EINVAL; |
130 | goto out; |
131 | } |
132 | |
133 | if (ncycles < ATMEL_SMC_MODE_TDF_MIN) |
134 | ncycles = ATMEL_SMC_MODE_TDF_MIN; |
135 | |
136 | smcconf->mode |= ATMEL_SMC_MODE_TDF(ncycles); |
137 | } |
138 | |
139 | for (i = 0; i < ARRAY_SIZE(timings_xlate_table); i++) { |
140 | const struct atmel_smc_timing_xlate *xlate; |
141 | |
142 | xlate = &timings_xlate_table[i]; |
143 | |
144 | ret = of_property_read_u32(np, propname: xlate->name, out_value: &val); |
145 | if (ret) { |
146 | if (!required) |
147 | continue; |
148 | else |
149 | break; |
150 | } |
151 | |
152 | if (!required) { |
153 | ret = -EINVAL; |
154 | break; |
155 | } |
156 | |
157 | ncycles = DIV_ROUND_UP(val, clk_period_ns); |
158 | ret = xlate->converter(smcconf, xlate->shift, ncycles); |
159 | if (ret) |
160 | goto out; |
161 | } |
162 | |
163 | out: |
164 | if (ret) { |
165 | dev_err(ebid->ebi->dev, |
166 | "missing or invalid timings definition in %pOF" , |
167 | np); |
168 | return ret; |
169 | } |
170 | |
171 | return required; |
172 | } |
173 | |
174 | static int atmel_ebi_xslate_smc_config(struct atmel_ebi_dev *ebid, |
175 | struct device_node *np, |
176 | struct atmel_ebi_dev_config *conf) |
177 | { |
178 | struct atmel_smc_cs_conf *smcconf = &conf->smcconf; |
179 | bool required = false; |
180 | const char *tmp_str; |
181 | u32 tmp; |
182 | int ret; |
183 | |
184 | ret = of_property_read_u32(np, propname: "atmel,smc-bus-width" , out_value: &tmp); |
185 | if (!ret) { |
186 | switch (tmp) { |
187 | case 8: |
188 | smcconf->mode |= ATMEL_SMC_MODE_DBW_8; |
189 | break; |
190 | |
191 | case 16: |
192 | smcconf->mode |= ATMEL_SMC_MODE_DBW_16; |
193 | break; |
194 | |
195 | case 32: |
196 | smcconf->mode |= ATMEL_SMC_MODE_DBW_32; |
197 | break; |
198 | |
199 | default: |
200 | return -EINVAL; |
201 | } |
202 | |
203 | required = true; |
204 | } |
205 | |
206 | if (of_property_read_bool(np, propname: "atmel,smc-tdf-optimized" )) { |
207 | smcconf->mode |= ATMEL_SMC_MODE_TDFMODE_OPTIMIZED; |
208 | required = true; |
209 | } |
210 | |
211 | tmp_str = NULL; |
212 | of_property_read_string(np, propname: "atmel,smc-byte-access-type" , out_string: &tmp_str); |
213 | if (tmp_str && !strcmp(tmp_str, "write" )) { |
214 | smcconf->mode |= ATMEL_SMC_MODE_BAT_WRITE; |
215 | required = true; |
216 | } |
217 | |
218 | tmp_str = NULL; |
219 | of_property_read_string(np, propname: "atmel,smc-read-mode" , out_string: &tmp_str); |
220 | if (tmp_str && !strcmp(tmp_str, "nrd" )) { |
221 | smcconf->mode |= ATMEL_SMC_MODE_READMODE_NRD; |
222 | required = true; |
223 | } |
224 | |
225 | tmp_str = NULL; |
226 | of_property_read_string(np, propname: "atmel,smc-write-mode" , out_string: &tmp_str); |
227 | if (tmp_str && !strcmp(tmp_str, "nwe" )) { |
228 | smcconf->mode |= ATMEL_SMC_MODE_WRITEMODE_NWE; |
229 | required = true; |
230 | } |
231 | |
232 | tmp_str = NULL; |
233 | of_property_read_string(np, propname: "atmel,smc-exnw-mode" , out_string: &tmp_str); |
234 | if (tmp_str) { |
235 | if (!strcmp(tmp_str, "frozen" )) |
236 | smcconf->mode |= ATMEL_SMC_MODE_EXNWMODE_FROZEN; |
237 | else if (!strcmp(tmp_str, "ready" )) |
238 | smcconf->mode |= ATMEL_SMC_MODE_EXNWMODE_READY; |
239 | else if (strcmp(tmp_str, "disabled" )) |
240 | return -EINVAL; |
241 | |
242 | required = true; |
243 | } |
244 | |
245 | ret = of_property_read_u32(np, propname: "atmel,smc-page-mode" , out_value: &tmp); |
246 | if (!ret) { |
247 | switch (tmp) { |
248 | case 4: |
249 | smcconf->mode |= ATMEL_SMC_MODE_PS_4; |
250 | break; |
251 | |
252 | case 8: |
253 | smcconf->mode |= ATMEL_SMC_MODE_PS_8; |
254 | break; |
255 | |
256 | case 16: |
257 | smcconf->mode |= ATMEL_SMC_MODE_PS_16; |
258 | break; |
259 | |
260 | case 32: |
261 | smcconf->mode |= ATMEL_SMC_MODE_PS_32; |
262 | break; |
263 | |
264 | default: |
265 | return -EINVAL; |
266 | } |
267 | |
268 | smcconf->mode |= ATMEL_SMC_MODE_PMEN; |
269 | required = true; |
270 | } |
271 | |
272 | ret = atmel_ebi_xslate_smc_timings(ebid, np, smcconf: &conf->smcconf); |
273 | if (ret < 0) |
274 | return -EINVAL; |
275 | |
276 | if ((ret > 0 && !required) || (!ret && required)) { |
277 | dev_err(ebid->ebi->dev, "missing atmel,smc- properties in %pOF" , |
278 | np); |
279 | return -EINVAL; |
280 | } |
281 | |
282 | return required; |
283 | } |
284 | |
285 | static void at91sam9_ebi_apply_config(struct atmel_ebi_dev *ebid, |
286 | struct atmel_ebi_dev_config *conf) |
287 | { |
288 | atmel_smc_cs_conf_apply(regmap: ebid->ebi->smc.regmap, cs: conf->cs, |
289 | conf: &conf->smcconf); |
290 | } |
291 | |
292 | static void sama5_ebi_apply_config(struct atmel_ebi_dev *ebid, |
293 | struct atmel_ebi_dev_config *conf) |
294 | { |
295 | atmel_hsmc_cs_conf_apply(regmap: ebid->ebi->smc.regmap, reglayout: ebid->ebi->smc.layout, |
296 | cs: conf->cs, conf: &conf->smcconf); |
297 | } |
298 | |
299 | static int atmel_ebi_dev_setup(struct atmel_ebi *ebi, struct device_node *np, |
300 | int reg_cells) |
301 | { |
302 | const struct atmel_ebi_caps *caps = ebi->caps; |
303 | struct atmel_ebi_dev_config conf = { }; |
304 | struct device *dev = ebi->dev; |
305 | struct atmel_ebi_dev *ebid; |
306 | unsigned long cslines = 0; |
307 | int ret, numcs = 0, nentries, i; |
308 | bool apply = false; |
309 | u32 cs; |
310 | |
311 | nentries = of_property_count_elems_of_size(np, propname: "reg" , |
312 | elem_size: reg_cells * sizeof(u32)); |
313 | for (i = 0; i < nentries; i++) { |
314 | ret = of_property_read_u32_index(np, propname: "reg" , index: i * reg_cells, |
315 | out_value: &cs); |
316 | if (ret) |
317 | return ret; |
318 | |
319 | if (cs >= AT91_EBI_NUM_CS || |
320 | !(ebi->caps->available_cs & BIT(cs))) { |
321 | dev_err(dev, "invalid reg property in %pOF\n" , np); |
322 | return -EINVAL; |
323 | } |
324 | |
325 | if (!test_and_set_bit(nr: cs, addr: &cslines)) |
326 | numcs++; |
327 | } |
328 | |
329 | if (!numcs) { |
330 | dev_err(dev, "invalid reg property in %pOF\n" , np); |
331 | return -EINVAL; |
332 | } |
333 | |
334 | ebid = devm_kzalloc(dev: ebi->dev, struct_size(ebid, configs, numcs), |
335 | GFP_KERNEL); |
336 | if (!ebid) |
337 | return -ENOMEM; |
338 | |
339 | ebid->ebi = ebi; |
340 | ebid->numcs = numcs; |
341 | |
342 | ret = caps->xlate_config(ebid, np, &conf); |
343 | if (ret < 0) |
344 | return ret; |
345 | else if (ret) |
346 | apply = true; |
347 | |
348 | i = 0; |
349 | for_each_set_bit(cs, &cslines, AT91_EBI_NUM_CS) { |
350 | ebid->configs[i].cs = cs; |
351 | |
352 | if (apply) { |
353 | conf.cs = cs; |
354 | caps->apply_config(ebid, &conf); |
355 | } |
356 | |
357 | caps->get_config(ebid, &ebid->configs[i]); |
358 | |
359 | /* |
360 | * Attach the EBI device to the generic SMC logic if at least |
361 | * one "atmel,smc-" property is present. |
362 | */ |
363 | if (ebi->caps->ebi_csa_offs && apply) |
364 | regmap_update_bits(map: ebi->regmap, |
365 | reg: ebi->caps->ebi_csa_offs, |
366 | BIT(cs), val: 0); |
367 | |
368 | i++; |
369 | } |
370 | |
371 | list_add_tail(new: &ebid->node, head: &ebi->devs); |
372 | |
373 | return 0; |
374 | } |
375 | |
376 | static const struct atmel_ebi_caps at91sam9260_ebi_caps = { |
377 | .available_cs = 0xff, |
378 | .ebi_csa_offs = AT91SAM9260_MATRIX_EBICSA, |
379 | .regmap_name = "atmel,matrix" , |
380 | .get_config = at91sam9_ebi_get_config, |
381 | .xlate_config = atmel_ebi_xslate_smc_config, |
382 | .apply_config = at91sam9_ebi_apply_config, |
383 | }; |
384 | |
385 | static const struct atmel_ebi_caps at91sam9261_ebi_caps = { |
386 | .available_cs = 0xff, |
387 | .ebi_csa_offs = AT91SAM9261_MATRIX_EBICSA, |
388 | .regmap_name = "atmel,matrix" , |
389 | .get_config = at91sam9_ebi_get_config, |
390 | .xlate_config = atmel_ebi_xslate_smc_config, |
391 | .apply_config = at91sam9_ebi_apply_config, |
392 | }; |
393 | |
394 | static const struct atmel_ebi_caps at91sam9263_ebi0_caps = { |
395 | .available_cs = 0x3f, |
396 | .ebi_csa_offs = AT91SAM9263_MATRIX_EBI0CSA, |
397 | .regmap_name = "atmel,matrix" , |
398 | .get_config = at91sam9_ebi_get_config, |
399 | .xlate_config = atmel_ebi_xslate_smc_config, |
400 | .apply_config = at91sam9_ebi_apply_config, |
401 | }; |
402 | |
403 | static const struct atmel_ebi_caps at91sam9263_ebi1_caps = { |
404 | .available_cs = 0x7, |
405 | .ebi_csa_offs = AT91SAM9263_MATRIX_EBI1CSA, |
406 | .regmap_name = "atmel,matrix" , |
407 | .get_config = at91sam9_ebi_get_config, |
408 | .xlate_config = atmel_ebi_xslate_smc_config, |
409 | .apply_config = at91sam9_ebi_apply_config, |
410 | }; |
411 | |
412 | static const struct atmel_ebi_caps at91sam9rl_ebi_caps = { |
413 | .available_cs = 0x3f, |
414 | .ebi_csa_offs = AT91SAM9RL_MATRIX_EBICSA, |
415 | .regmap_name = "atmel,matrix" , |
416 | .get_config = at91sam9_ebi_get_config, |
417 | .xlate_config = atmel_ebi_xslate_smc_config, |
418 | .apply_config = at91sam9_ebi_apply_config, |
419 | }; |
420 | |
421 | static const struct atmel_ebi_caps at91sam9g45_ebi_caps = { |
422 | .available_cs = 0x3f, |
423 | .ebi_csa_offs = AT91SAM9G45_MATRIX_EBICSA, |
424 | .regmap_name = "atmel,matrix" , |
425 | .get_config = at91sam9_ebi_get_config, |
426 | .xlate_config = atmel_ebi_xslate_smc_config, |
427 | .apply_config = at91sam9_ebi_apply_config, |
428 | }; |
429 | |
430 | static const struct atmel_ebi_caps at91sam9x5_ebi_caps = { |
431 | .available_cs = 0x3f, |
432 | .ebi_csa_offs = AT91SAM9X5_MATRIX_EBICSA, |
433 | .regmap_name = "atmel,matrix" , |
434 | .get_config = at91sam9_ebi_get_config, |
435 | .xlate_config = atmel_ebi_xslate_smc_config, |
436 | .apply_config = at91sam9_ebi_apply_config, |
437 | }; |
438 | |
439 | static const struct atmel_ebi_caps sama5d3_ebi_caps = { |
440 | .available_cs = 0xf, |
441 | .get_config = sama5_ebi_get_config, |
442 | .xlate_config = atmel_ebi_xslate_smc_config, |
443 | .apply_config = sama5_ebi_apply_config, |
444 | }; |
445 | |
446 | static const struct atmel_ebi_caps sam9x60_ebi_caps = { |
447 | .available_cs = 0x3f, |
448 | .ebi_csa_offs = AT91_SFR_CCFG_EBICSA, |
449 | .regmap_name = "microchip,sfr" , |
450 | .get_config = at91sam9_ebi_get_config, |
451 | .xlate_config = atmel_ebi_xslate_smc_config, |
452 | .apply_config = at91sam9_ebi_apply_config, |
453 | }; |
454 | |
455 | static const struct of_device_id atmel_ebi_id_table[] = { |
456 | { |
457 | .compatible = "atmel,at91sam9260-ebi" , |
458 | .data = &at91sam9260_ebi_caps, |
459 | }, |
460 | { |
461 | .compatible = "atmel,at91sam9261-ebi" , |
462 | .data = &at91sam9261_ebi_caps, |
463 | }, |
464 | { |
465 | .compatible = "atmel,at91sam9263-ebi0" , |
466 | .data = &at91sam9263_ebi0_caps, |
467 | }, |
468 | { |
469 | .compatible = "atmel,at91sam9263-ebi1" , |
470 | .data = &at91sam9263_ebi1_caps, |
471 | }, |
472 | { |
473 | .compatible = "atmel,at91sam9rl-ebi" , |
474 | .data = &at91sam9rl_ebi_caps, |
475 | }, |
476 | { |
477 | .compatible = "atmel,at91sam9g45-ebi" , |
478 | .data = &at91sam9g45_ebi_caps, |
479 | }, |
480 | { |
481 | .compatible = "atmel,at91sam9x5-ebi" , |
482 | .data = &at91sam9x5_ebi_caps, |
483 | }, |
484 | { |
485 | .compatible = "atmel,sama5d3-ebi" , |
486 | .data = &sama5d3_ebi_caps, |
487 | }, |
488 | { |
489 | .compatible = "microchip,sam9x60-ebi" , |
490 | .data = &sam9x60_ebi_caps, |
491 | }, |
492 | { /* sentinel */ } |
493 | }; |
494 | |
495 | static int atmel_ebi_dev_disable(struct atmel_ebi *ebi, struct device_node *np) |
496 | { |
497 | struct device *dev = ebi->dev; |
498 | struct property *newprop; |
499 | |
500 | newprop = devm_kzalloc(dev, size: sizeof(*newprop), GFP_KERNEL); |
501 | if (!newprop) |
502 | return -ENOMEM; |
503 | |
504 | newprop->name = devm_kstrdup(dev, s: "status" , GFP_KERNEL); |
505 | if (!newprop->name) |
506 | return -ENOMEM; |
507 | |
508 | newprop->value = devm_kstrdup(dev, s: "disabled" , GFP_KERNEL); |
509 | if (!newprop->value) |
510 | return -ENOMEM; |
511 | |
512 | newprop->length = sizeof("disabled" ); |
513 | |
514 | return of_update_property(np, newprop); |
515 | } |
516 | |
517 | static int atmel_ebi_probe(struct platform_device *pdev) |
518 | { |
519 | struct device *dev = &pdev->dev; |
520 | struct device_node *child, *np = dev->of_node, *smc_np; |
521 | struct atmel_ebi *ebi; |
522 | int ret, reg_cells; |
523 | struct clk *clk; |
524 | u32 val; |
525 | |
526 | ebi = devm_kzalloc(dev, size: sizeof(*ebi), GFP_KERNEL); |
527 | if (!ebi) |
528 | return -ENOMEM; |
529 | |
530 | platform_set_drvdata(pdev, data: ebi); |
531 | |
532 | INIT_LIST_HEAD(list: &ebi->devs); |
533 | ebi->caps = device_get_match_data(dev); |
534 | if (!ebi->caps) |
535 | return -EINVAL; |
536 | ebi->dev = dev; |
537 | |
538 | clk = devm_clk_get(dev, NULL); |
539 | if (IS_ERR(ptr: clk)) |
540 | return PTR_ERR(ptr: clk); |
541 | |
542 | ebi->clk = clk; |
543 | |
544 | smc_np = of_parse_phandle(np: dev->of_node, phandle_name: "atmel,smc" , index: 0); |
545 | |
546 | ebi->smc.regmap = syscon_node_to_regmap(np: smc_np); |
547 | if (IS_ERR(ptr: ebi->smc.regmap)) { |
548 | ret = PTR_ERR(ptr: ebi->smc.regmap); |
549 | goto put_node; |
550 | } |
551 | |
552 | ebi->smc.layout = atmel_hsmc_get_reg_layout(np: smc_np); |
553 | if (IS_ERR(ptr: ebi->smc.layout)) { |
554 | ret = PTR_ERR(ptr: ebi->smc.layout); |
555 | goto put_node; |
556 | } |
557 | |
558 | ebi->smc.clk = of_clk_get(np: smc_np, index: 0); |
559 | if (IS_ERR(ptr: ebi->smc.clk)) { |
560 | if (PTR_ERR(ptr: ebi->smc.clk) != -ENOENT) { |
561 | ret = PTR_ERR(ptr: ebi->smc.clk); |
562 | goto put_node; |
563 | } |
564 | |
565 | ebi->smc.clk = NULL; |
566 | } |
567 | of_node_put(node: smc_np); |
568 | ret = clk_prepare_enable(clk: ebi->smc.clk); |
569 | if (ret) |
570 | return ret; |
571 | |
572 | /* |
573 | * The sama5d3 does not provide an EBICSA register and thus does need |
574 | * to access it. |
575 | */ |
576 | if (ebi->caps->ebi_csa_offs) { |
577 | ebi->regmap = |
578 | syscon_regmap_lookup_by_phandle(np, |
579 | property: ebi->caps->regmap_name); |
580 | if (IS_ERR(ptr: ebi->regmap)) |
581 | return PTR_ERR(ptr: ebi->regmap); |
582 | } |
583 | |
584 | ret = of_property_read_u32(np, propname: "#address-cells" , out_value: &val); |
585 | if (ret) { |
586 | dev_err(dev, "missing #address-cells property\n" ); |
587 | return ret; |
588 | } |
589 | |
590 | reg_cells = val; |
591 | |
592 | ret = of_property_read_u32(np, propname: "#size-cells" , out_value: &val); |
593 | if (ret) { |
594 | dev_err(dev, "missing #address-cells property\n" ); |
595 | return ret; |
596 | } |
597 | |
598 | reg_cells += val; |
599 | |
600 | for_each_available_child_of_node(np, child) { |
601 | if (!of_property_present(np: child, propname: "reg" )) |
602 | continue; |
603 | |
604 | ret = atmel_ebi_dev_setup(ebi, np: child, reg_cells); |
605 | if (ret) { |
606 | dev_err(dev, "failed to configure EBI bus for %pOF, disabling the device" , |
607 | child); |
608 | |
609 | ret = atmel_ebi_dev_disable(ebi, np: child); |
610 | if (ret) { |
611 | of_node_put(node: child); |
612 | return ret; |
613 | } |
614 | } |
615 | } |
616 | |
617 | return of_platform_populate(root: np, NULL, NULL, parent: dev); |
618 | |
619 | put_node: |
620 | of_node_put(node: smc_np); |
621 | return ret; |
622 | } |
623 | |
624 | static __maybe_unused int atmel_ebi_resume(struct device *dev) |
625 | { |
626 | struct atmel_ebi *ebi = dev_get_drvdata(dev); |
627 | struct atmel_ebi_dev *ebid; |
628 | |
629 | list_for_each_entry(ebid, &ebi->devs, node) { |
630 | int i; |
631 | |
632 | for (i = 0; i < ebid->numcs; i++) |
633 | ebid->ebi->caps->apply_config(ebid, &ebid->configs[i]); |
634 | } |
635 | |
636 | return 0; |
637 | } |
638 | |
639 | static SIMPLE_DEV_PM_OPS(atmel_ebi_pm_ops, NULL, atmel_ebi_resume); |
640 | |
641 | static struct platform_driver atmel_ebi_driver = { |
642 | .driver = { |
643 | .name = "atmel-ebi" , |
644 | .of_match_table = atmel_ebi_id_table, |
645 | .pm = &atmel_ebi_pm_ops, |
646 | }, |
647 | }; |
648 | builtin_platform_driver_probe(atmel_ebi_driver, atmel_ebi_probe); |
649 | |