xref: /openbmc/linux/drivers/mfd/da9062-core.c (revision a8da474e) 
1 /*
2  * Core, IRQ and I2C device driver for DA9062 PMIC
3  * Copyright (C) 2015  Dialog Semiconductor Ltd.
4  *
5  * This program is free software; you can redistribute it and/or
6  * modify it under the terms of the GNU General Public License
7  * as published by the Free Software Foundation; either version 2
8  * of the License, or (at your option) any later version.
9  *
10  * This program is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13  * GNU General Public License for more details.
14  */
15 
16 #include <linux/kernel.h>
17 #include <linux/module.h>
18 #include <linux/init.h>
19 #include <linux/device.h>
20 #include <linux/interrupt.h>
21 #include <linux/regmap.h>
22 #include <linux/irq.h>
23 #include <linux/mfd/core.h>
24 #include <linux/i2c.h>
25 #include <linux/mfd/da9062/core.h>
26 #include <linux/mfd/da9062/registers.h>
27 #include <linux/regulator/of_regulator.h>
28 
29 #define	DA9062_REG_EVENT_A_OFFSET	0
30 #define	DA9062_REG_EVENT_B_OFFSET	1
31 #define	DA9062_REG_EVENT_C_OFFSET	2
32 
33 static struct regmap_irq da9062_irqs[] = {
34 	/* EVENT A */
35 	[DA9062_IRQ_ONKEY] = {
36 		.reg_offset = DA9062_REG_EVENT_A_OFFSET,
37 		.mask = DA9062AA_M_NONKEY_MASK,
38 	},
39 	[DA9062_IRQ_ALARM] = {
40 		.reg_offset = DA9062_REG_EVENT_A_OFFSET,
41 		.mask = DA9062AA_M_ALARM_MASK,
42 	},
43 	[DA9062_IRQ_TICK] = {
44 		.reg_offset = DA9062_REG_EVENT_A_OFFSET,
45 		.mask = DA9062AA_M_TICK_MASK,
46 	},
47 	[DA9062_IRQ_WDG_WARN] = {
48 		.reg_offset = DA9062_REG_EVENT_A_OFFSET,
49 		.mask = DA9062AA_M_WDG_WARN_MASK,
50 	},
51 	[DA9062_IRQ_SEQ_RDY] = {
52 		.reg_offset = DA9062_REG_EVENT_A_OFFSET,
53 		.mask = DA9062AA_M_SEQ_RDY_MASK,
54 	},
55 	/* EVENT B */
56 	[DA9062_IRQ_TEMP] = {
57 		.reg_offset = DA9062_REG_EVENT_B_OFFSET,
58 		.mask = DA9062AA_M_TEMP_MASK,
59 	},
60 	[DA9062_IRQ_LDO_LIM] = {
61 		.reg_offset = DA9062_REG_EVENT_B_OFFSET,
62 		.mask = DA9062AA_M_LDO_LIM_MASK,
63 	},
64 	[DA9062_IRQ_DVC_RDY] = {
65 		.reg_offset = DA9062_REG_EVENT_B_OFFSET,
66 		.mask = DA9062AA_M_DVC_RDY_MASK,
67 	},
68 	[DA9062_IRQ_VDD_WARN] = {
69 		.reg_offset = DA9062_REG_EVENT_B_OFFSET,
70 		.mask = DA9062AA_M_VDD_WARN_MASK,
71 	},
72 	/* EVENT C */
73 	[DA9062_IRQ_GPI0] = {
74 		.reg_offset = DA9062_REG_EVENT_C_OFFSET,
75 		.mask = DA9062AA_M_GPI0_MASK,
76 	},
77 	[DA9062_IRQ_GPI1] = {
78 		.reg_offset = DA9062_REG_EVENT_C_OFFSET,
79 		.mask = DA9062AA_M_GPI1_MASK,
80 	},
81 	[DA9062_IRQ_GPI2] = {
82 		.reg_offset = DA9062_REG_EVENT_C_OFFSET,
83 		.mask = DA9062AA_M_GPI2_MASK,
84 	},
85 	[DA9062_IRQ_GPI3] = {
86 		.reg_offset = DA9062_REG_EVENT_C_OFFSET,
87 		.mask = DA9062AA_M_GPI3_MASK,
88 	},
89 	[DA9062_IRQ_GPI4] = {
90 		.reg_offset = DA9062_REG_EVENT_C_OFFSET,
91 		.mask = DA9062AA_M_GPI4_MASK,
92 	},
93 };
94 
95 static struct regmap_irq_chip da9062_irq_chip = {
96 	.name = "da9062-irq",
97 	.irqs = da9062_irqs,
98 	.num_irqs = DA9062_NUM_IRQ,
99 	.num_regs = 3,
100 	.status_base = DA9062AA_EVENT_A,
101 	.mask_base = DA9062AA_IRQ_MASK_A,
102 	.ack_base = DA9062AA_EVENT_A,
103 };
104 
105 static struct resource da9062_core_resources[] = {
106 	DEFINE_RES_NAMED(DA9062_IRQ_VDD_WARN, 1, "VDD_WARN", IORESOURCE_IRQ),
107 };
108 
109 static struct resource da9062_regulators_resources[] = {
110 	DEFINE_RES_NAMED(DA9062_IRQ_LDO_LIM, 1, "LDO_LIM", IORESOURCE_IRQ),
111 };
112 
113 static struct resource da9062_thermal_resources[] = {
114 	DEFINE_RES_NAMED(DA9062_IRQ_TEMP, 1, "THERMAL", IORESOURCE_IRQ),
115 };
116 
117 static struct resource da9062_wdt_resources[] = {
118 	DEFINE_RES_NAMED(DA9062_IRQ_WDG_WARN, 1, "WD_WARN", IORESOURCE_IRQ),
119 };
120 
121 static struct resource da9062_rtc_resources[] = {
122 	DEFINE_RES_NAMED(DA9062_IRQ_ALARM, 1, "ALARM", IORESOURCE_IRQ),
123 	DEFINE_RES_NAMED(DA9062_IRQ_TICK, 1, "TICK", IORESOURCE_IRQ),
124 };
125 
126 static struct resource da9062_onkey_resources[] = {
127 	DEFINE_RES_NAMED(DA9062_IRQ_ONKEY, 1, "ONKEY", IORESOURCE_IRQ),
128 };
129 
130 static const struct mfd_cell da9062_devs[] = {
131 	{
132 		.name		= "da9062-core",
133 		.num_resources	= ARRAY_SIZE(da9062_core_resources),
134 		.resources	= da9062_core_resources,
135 	},
136 	{
137 		.name		= "da9062-regulators",
138 		.num_resources	= ARRAY_SIZE(da9062_regulators_resources),
139 		.resources	= da9062_regulators_resources,
140 	},
141 	{
142 		.name		= "da9062-watchdog",
143 		.num_resources	= ARRAY_SIZE(da9062_wdt_resources),
144 		.resources	= da9062_wdt_resources,
145 		.of_compatible  = "dlg,da9062-wdt",
146 	},
147 	{
148 		.name		= "da9062-thermal",
149 		.num_resources	= ARRAY_SIZE(da9062_thermal_resources),
150 		.resources	= da9062_thermal_resources,
151 		.of_compatible  = "dlg,da9062-thermal",
152 	},
153 	{
154 		.name		= "da9062-rtc",
155 		.num_resources	= ARRAY_SIZE(da9062_rtc_resources),
156 		.resources	= da9062_rtc_resources,
157 		.of_compatible  = "dlg,da9062-rtc",
158 	},
159 	{
160 		.name		= "da9062-onkey",
161 		.num_resources	= ARRAY_SIZE(da9062_onkey_resources),
162 		.resources	= da9062_onkey_resources,
163 		.of_compatible = "dlg,da9062-onkey",
164 	},
165 };
166 
167 static int da9062_clear_fault_log(struct da9062 *chip)
168 {
169 	int ret;
170 	int fault_log;
171 
172 	ret = regmap_read(chip->regmap, DA9062AA_FAULT_LOG, &fault_log);
173 	if (ret < 0)
174 		return ret;
175 
176 	if (fault_log) {
177 		if (fault_log & DA9062AA_TWD_ERROR_MASK)
178 			dev_dbg(chip->dev, "Fault log entry detected: TWD_ERROR\n");
179 		if (fault_log & DA9062AA_POR_MASK)
180 			dev_dbg(chip->dev, "Fault log entry detected: POR\n");
181 		if (fault_log & DA9062AA_VDD_FAULT_MASK)
182 			dev_dbg(chip->dev, "Fault log entry detected: VDD_FAULT\n");
183 		if (fault_log & DA9062AA_VDD_START_MASK)
184 			dev_dbg(chip->dev, "Fault log entry detected: VDD_START\n");
185 		if (fault_log & DA9062AA_TEMP_CRIT_MASK)
186 			dev_dbg(chip->dev, "Fault log entry detected: TEMP_CRIT\n");
187 		if (fault_log & DA9062AA_KEY_RESET_MASK)
188 			dev_dbg(chip->dev, "Fault log entry detected: KEY_RESET\n");
189 		if (fault_log & DA9062AA_NSHUTDOWN_MASK)
190 			dev_dbg(chip->dev, "Fault log entry detected: NSHUTDOWN\n");
191 		if (fault_log & DA9062AA_WAIT_SHUT_MASK)
192 			dev_dbg(chip->dev, "Fault log entry detected: WAIT_SHUT\n");
193 
194 		ret = regmap_write(chip->regmap, DA9062AA_FAULT_LOG,
195 				   fault_log);
196 	}
197 
198 	return ret;
199 }
200 
201 static int da9062_get_device_type(struct da9062 *chip)
202 {
203 	int device_id, variant_id, variant_mrc;
204 	int ret;
205 
206 	ret = regmap_read(chip->regmap, DA9062AA_DEVICE_ID, &device_id);
207 	if (ret < 0) {
208 		dev_err(chip->dev, "Cannot read chip ID.\n");
209 		return -EIO;
210 	}
211 	if (device_id != DA9062_PMIC_DEVICE_ID) {
212 		dev_err(chip->dev, "Invalid device ID: 0x%02x\n", device_id);
213 		return -ENODEV;
214 	}
215 
216 	ret = regmap_read(chip->regmap, DA9062AA_VARIANT_ID, &variant_id);
217 	if (ret < 0) {
218 		dev_err(chip->dev, "Cannot read chip variant id.\n");
219 		return -EIO;
220 	}
221 
222 	dev_info(chip->dev,
223 		 "Device detected (device-ID: 0x%02X, var-ID: 0x%02X)\n",
224 		 device_id, variant_id);
225 
226 	variant_mrc = (variant_id & DA9062AA_MRC_MASK) >> DA9062AA_MRC_SHIFT;
227 
228 	if (variant_mrc < DA9062_PMIC_VARIANT_MRC_AA) {
229 		dev_err(chip->dev,
230 			"Cannot support variant MRC: 0x%02X\n", variant_mrc);
231 		return -ENODEV;
232 	}
233 
234 	return ret;
235 }
236 
237 static const struct regmap_range da9062_aa_readable_ranges[] = {
238 	{
239 		.range_min = DA9062AA_PAGE_CON,
240 		.range_max = DA9062AA_STATUS_B,
241 	}, {
242 		.range_min = DA9062AA_STATUS_D,
243 		.range_max = DA9062AA_EVENT_C,
244 	}, {
245 		.range_min = DA9062AA_IRQ_MASK_A,
246 		.range_max = DA9062AA_IRQ_MASK_C,
247 	}, {
248 		.range_min = DA9062AA_CONTROL_A,
249 		.range_max = DA9062AA_GPIO_4,
250 	}, {
251 		.range_min = DA9062AA_GPIO_WKUP_MODE,
252 		.range_max = DA9062AA_BUCK4_CONT,
253 	}, {
254 		.range_min = DA9062AA_BUCK3_CONT,
255 		.range_max = DA9062AA_BUCK3_CONT,
256 	}, {
257 		.range_min = DA9062AA_LDO1_CONT,
258 		.range_max = DA9062AA_LDO4_CONT,
259 	}, {
260 		.range_min = DA9062AA_DVC_1,
261 		.range_max = DA9062AA_DVC_1,
262 	}, {
263 		.range_min = DA9062AA_COUNT_S,
264 		.range_max = DA9062AA_SECOND_D,
265 	}, {
266 		.range_min = DA9062AA_SEQ,
267 		.range_max = DA9062AA_ID_4_3,
268 	}, {
269 		.range_min = DA9062AA_ID_12_11,
270 		.range_max = DA9062AA_ID_16_15,
271 	}, {
272 		.range_min = DA9062AA_ID_22_21,
273 		.range_max = DA9062AA_ID_32_31,
274 	}, {
275 		.range_min = DA9062AA_SEQ_A,
276 		.range_max = DA9062AA_BUCK3_CFG,
277 	}, {
278 		.range_min = DA9062AA_VBUCK2_A,
279 		.range_max = DA9062AA_VBUCK4_A,
280 	}, {
281 		.range_min = DA9062AA_VBUCK3_A,
282 		.range_max = DA9062AA_VBUCK3_A,
283 	}, {
284 		.range_min = DA9062AA_VLDO1_A,
285 		.range_max = DA9062AA_VLDO4_A,
286 	}, {
287 		.range_min = DA9062AA_VBUCK2_B,
288 		.range_max = DA9062AA_VBUCK4_B,
289 	}, {
290 		.range_min = DA9062AA_VBUCK3_B,
291 		.range_max = DA9062AA_VBUCK3_B,
292 	}, {
293 		.range_min = DA9062AA_VLDO1_B,
294 		.range_max = DA9062AA_VLDO4_B,
295 	}, {
296 		.range_min = DA9062AA_BBAT_CONT,
297 		.range_max = DA9062AA_BBAT_CONT,
298 	}, {
299 		.range_min = DA9062AA_INTERFACE,
300 		.range_max = DA9062AA_CONFIG_E,
301 	}, {
302 		.range_min = DA9062AA_CONFIG_G,
303 		.range_max = DA9062AA_CONFIG_K,
304 	}, {
305 		.range_min = DA9062AA_CONFIG_M,
306 		.range_max = DA9062AA_CONFIG_M,
307 	}, {
308 		.range_min = DA9062AA_TRIM_CLDR,
309 		.range_max = DA9062AA_GP_ID_19,
310 	}, {
311 		.range_min = DA9062AA_DEVICE_ID,
312 		.range_max = DA9062AA_CONFIG_ID,
313 	},
314 };
315 
316 static const struct regmap_range da9062_aa_writeable_ranges[] = {
317 	{
318 		.range_min = DA9062AA_PAGE_CON,
319 		.range_max = DA9062AA_PAGE_CON,
320 	}, {
321 		.range_min = DA9062AA_FAULT_LOG,
322 		.range_max = DA9062AA_EVENT_C,
323 	}, {
324 		.range_min = DA9062AA_IRQ_MASK_A,
325 		.range_max = DA9062AA_IRQ_MASK_C,
326 	}, {
327 		.range_min = DA9062AA_CONTROL_A,
328 		.range_max = DA9062AA_GPIO_4,
329 	}, {
330 		.range_min = DA9062AA_GPIO_WKUP_MODE,
331 		.range_max = DA9062AA_BUCK4_CONT,
332 	}, {
333 		.range_min = DA9062AA_BUCK3_CONT,
334 		.range_max = DA9062AA_BUCK3_CONT,
335 	}, {
336 		.range_min = DA9062AA_LDO1_CONT,
337 		.range_max = DA9062AA_LDO4_CONT,
338 	}, {
339 		.range_min = DA9062AA_DVC_1,
340 		.range_max = DA9062AA_DVC_1,
341 	}, {
342 		.range_min = DA9062AA_COUNT_S,
343 		.range_max = DA9062AA_ALARM_Y,
344 	}, {
345 		.range_min = DA9062AA_SEQ,
346 		.range_max = DA9062AA_ID_4_3,
347 	}, {
348 		.range_min = DA9062AA_ID_12_11,
349 		.range_max = DA9062AA_ID_16_15,
350 	}, {
351 		.range_min = DA9062AA_ID_22_21,
352 		.range_max = DA9062AA_ID_32_31,
353 	}, {
354 		.range_min = DA9062AA_SEQ_A,
355 		.range_max = DA9062AA_BUCK3_CFG,
356 	}, {
357 		.range_min = DA9062AA_VBUCK2_A,
358 		.range_max = DA9062AA_VBUCK4_A,
359 	}, {
360 		.range_min = DA9062AA_VBUCK3_A,
361 		.range_max = DA9062AA_VBUCK3_A,
362 	}, {
363 		.range_min = DA9062AA_VLDO1_A,
364 		.range_max = DA9062AA_VLDO4_A,
365 	}, {
366 		.range_min = DA9062AA_VBUCK2_B,
367 		.range_max = DA9062AA_VBUCK4_B,
368 	}, {
369 		.range_min = DA9062AA_VBUCK3_B,
370 		.range_max = DA9062AA_VBUCK3_B,
371 	}, {
372 		.range_min = DA9062AA_VLDO1_B,
373 		.range_max = DA9062AA_VLDO4_B,
374 	}, {
375 		.range_min = DA9062AA_BBAT_CONT,
376 		.range_max = DA9062AA_BBAT_CONT,
377 	}, {
378 		.range_min = DA9062AA_GP_ID_0,
379 		.range_max = DA9062AA_GP_ID_19,
380 	},
381 };
382 
383 static const struct regmap_range da9062_aa_volatile_ranges[] = {
384 	{
385 		.range_min = DA9062AA_PAGE_CON,
386 		.range_max = DA9062AA_STATUS_B,
387 	}, {
388 		.range_min = DA9062AA_STATUS_D,
389 		.range_max = DA9062AA_EVENT_C,
390 	}, {
391 		.range_min = DA9062AA_CONTROL_F,
392 		.range_max = DA9062AA_CONTROL_F,
393 	}, {
394 		.range_min = DA9062AA_COUNT_S,
395 		.range_max = DA9062AA_SECOND_D,
396 	},
397 };
398 
399 static const struct regmap_access_table da9062_aa_readable_table = {
400 	.yes_ranges = da9062_aa_readable_ranges,
401 	.n_yes_ranges = ARRAY_SIZE(da9062_aa_readable_ranges),
402 };
403 
404 static const struct regmap_access_table da9062_aa_writeable_table = {
405 	.yes_ranges = da9062_aa_writeable_ranges,
406 	.n_yes_ranges = ARRAY_SIZE(da9062_aa_writeable_ranges),
407 };
408 
409 static const struct regmap_access_table da9062_aa_volatile_table = {
410 	.yes_ranges = da9062_aa_volatile_ranges,
411 	.n_yes_ranges = ARRAY_SIZE(da9062_aa_volatile_ranges),
412 };
413 
414 static const struct regmap_range_cfg da9062_range_cfg[] = {
415 	{
416 		.range_min = DA9062AA_PAGE_CON,
417 		.range_max = DA9062AA_CONFIG_ID,
418 		.selector_reg = DA9062AA_PAGE_CON,
419 		.selector_mask = 1 << DA9062_I2C_PAGE_SEL_SHIFT,
420 		.selector_shift = DA9062_I2C_PAGE_SEL_SHIFT,
421 		.window_start = 0,
422 		.window_len = 256,
423 	}
424 };
425 
426 static struct regmap_config da9062_regmap_config = {
427 	.reg_bits = 8,
428 	.val_bits = 8,
429 	.ranges = da9062_range_cfg,
430 	.num_ranges = ARRAY_SIZE(da9062_range_cfg),
431 	.max_register = DA9062AA_CONFIG_ID,
432 	.cache_type = REGCACHE_RBTREE,
433 	.rd_table = &da9062_aa_readable_table,
434 	.wr_table = &da9062_aa_writeable_table,
435 	.volatile_table = &da9062_aa_volatile_table,
436 };
437 
438 static int da9062_i2c_probe(struct i2c_client *i2c,
439 	const struct i2c_device_id *id)
440 {
441 	struct da9062 *chip;
442 	unsigned int irq_base;
443 	int ret;
444 
445 	chip = devm_kzalloc(&i2c->dev, sizeof(*chip), GFP_KERNEL);
446 	if (!chip)
447 		return -ENOMEM;
448 
449 	i2c_set_clientdata(i2c, chip);
450 	chip->dev = &i2c->dev;
451 
452 	if (!i2c->irq) {
453 		dev_err(chip->dev, "No IRQ configured\n");
454 		return -EINVAL;
455 	}
456 
457 	chip->regmap = devm_regmap_init_i2c(i2c, &da9062_regmap_config);
458 	if (IS_ERR(chip->regmap)) {
459 		ret = PTR_ERR(chip->regmap);
460 		dev_err(chip->dev, "Failed to allocate register map: %d\n",
461 			ret);
462 		return ret;
463 	}
464 
465 	ret = da9062_clear_fault_log(chip);
466 	if (ret < 0)
467 		dev_warn(chip->dev, "Cannot clear fault log\n");
468 
469 	ret = da9062_get_device_type(chip);
470 	if (ret)
471 		return ret;
472 
473 	ret = regmap_add_irq_chip(chip->regmap, i2c->irq,
474 			IRQF_TRIGGER_LOW | IRQF_ONESHOT | IRQF_SHARED,
475 			-1, &da9062_irq_chip,
476 			&chip->regmap_irq);
477 	if (ret) {
478 		dev_err(chip->dev, "Failed to request IRQ %d: %d\n",
479 			i2c->irq, ret);
480 		return ret;
481 	}
482 
483 	irq_base = regmap_irq_chip_get_base(chip->regmap_irq);
484 
485 	ret = mfd_add_devices(chip->dev, PLATFORM_DEVID_NONE, da9062_devs,
486 			      ARRAY_SIZE(da9062_devs), NULL, irq_base,
487 			      NULL);
488 	if (ret) {
489 		dev_err(chip->dev, "Cannot register child devices\n");
490 		regmap_del_irq_chip(i2c->irq, chip->regmap_irq);
491 		return ret;
492 	}
493 
494 	return ret;
495 }
496 
497 static int da9062_i2c_remove(struct i2c_client *i2c)
498 {
499 	struct da9062 *chip = i2c_get_clientdata(i2c);
500 
501 	mfd_remove_devices(chip->dev);
502 	regmap_del_irq_chip(i2c->irq, chip->regmap_irq);
503 
504 	return 0;
505 }
506 
507 static const struct i2c_device_id da9062_i2c_id[] = {
508 	{ "da9062", 0 },
509 	{ },
510 };
511 MODULE_DEVICE_TABLE(i2c, da9062_i2c_id);
512 
513 static const struct of_device_id da9062_dt_ids[] = {
514 	{ .compatible = "dlg,da9062", },
515 	{ }
516 };
517 MODULE_DEVICE_TABLE(of, da9062_dt_ids);
518 
519 static struct i2c_driver da9062_i2c_driver = {
520 	.driver = {
521 		.name = "da9062",
522 		.of_match_table = of_match_ptr(da9062_dt_ids),
523 	},
524 	.probe    = da9062_i2c_probe,
525 	.remove   = da9062_i2c_remove,
526 	.id_table = da9062_i2c_id,
527 };
528 
529 module_i2c_driver(da9062_i2c_driver);
530 
531 MODULE_DESCRIPTION("Core device driver for Dialog DA9062");
532 MODULE_AUTHOR("Steve Twiss <stwiss.opensource@diasemi.com>");
533 MODULE_LICENSE("GPL");
534