xref: /openbmc/linux/drivers/mfd/mc13xxx-core.c (revision e8f6f3b4)
1 /*
2  * Copyright 2009-2010 Pengutronix
3  * Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de>
4  *
5  * loosely based on an earlier driver that has
6  * Copyright 2009 Pengutronix, Sascha Hauer <s.hauer@pengutronix.de>
7  *
8  * This program is free software; you can redistribute it and/or modify it under
9  * the terms of the GNU General Public License version 2 as published by the
10  * Free Software Foundation.
11  */
12 
13 #include <linux/module.h>
14 #include <linux/of.h>
15 #include <linux/of_device.h>
16 #include <linux/platform_device.h>
17 #include <linux/mfd/core.h>
18 
19 #include "mc13xxx.h"
20 
21 #define MC13XXX_IRQSTAT0	0
22 #define MC13XXX_IRQMASK0	1
23 #define MC13XXX_IRQSTAT1	3
24 #define MC13XXX_IRQMASK1	4
25 
26 #define MC13XXX_REVISION	7
27 #define MC13XXX_REVISION_REVMETAL	(0x07 <<  0)
28 #define MC13XXX_REVISION_REVFULL	(0x03 <<  3)
29 #define MC13XXX_REVISION_ICID		(0x07 <<  6)
30 #define MC13XXX_REVISION_FIN		(0x03 <<  9)
31 #define MC13XXX_REVISION_FAB		(0x03 << 11)
32 #define MC13XXX_REVISION_ICIDCODE	(0x3f << 13)
33 
34 #define MC34708_REVISION_REVMETAL	(0x07 <<  0)
35 #define MC34708_REVISION_REVFULL	(0x07 <<  3)
36 #define MC34708_REVISION_FIN		(0x07 <<  6)
37 #define MC34708_REVISION_FAB		(0x07 <<  9)
38 
39 #define MC13XXX_PWRCTRL		15
40 #define MC13XXX_PWRCTRL_WDIRESET	(1 << 12)
41 
42 #define MC13XXX_ADC1		44
43 #define MC13XXX_ADC1_ADEN		(1 << 0)
44 #define MC13XXX_ADC1_RAND		(1 << 1)
45 #define MC13XXX_ADC1_ADSEL		(1 << 3)
46 #define MC13XXX_ADC1_ASC		(1 << 20)
47 #define MC13XXX_ADC1_ADTRIGIGN		(1 << 21)
48 
49 #define MC13XXX_ADC2		45
50 
51 void mc13xxx_lock(struct mc13xxx *mc13xxx)
52 {
53 	if (!mutex_trylock(&mc13xxx->lock)) {
54 		dev_dbg(mc13xxx->dev, "wait for %s from %pf\n",
55 				__func__, __builtin_return_address(0));
56 
57 		mutex_lock(&mc13xxx->lock);
58 	}
59 	dev_dbg(mc13xxx->dev, "%s from %pf\n",
60 			__func__, __builtin_return_address(0));
61 }
62 EXPORT_SYMBOL(mc13xxx_lock);
63 
64 void mc13xxx_unlock(struct mc13xxx *mc13xxx)
65 {
66 	dev_dbg(mc13xxx->dev, "%s from %pf\n",
67 			__func__, __builtin_return_address(0));
68 	mutex_unlock(&mc13xxx->lock);
69 }
70 EXPORT_SYMBOL(mc13xxx_unlock);
71 
72 int mc13xxx_reg_read(struct mc13xxx *mc13xxx, unsigned int offset, u32 *val)
73 {
74 	int ret;
75 
76 	ret = regmap_read(mc13xxx->regmap, offset, val);
77 	dev_vdbg(mc13xxx->dev, "[0x%02x] -> 0x%06x\n", offset, *val);
78 
79 	return ret;
80 }
81 EXPORT_SYMBOL(mc13xxx_reg_read);
82 
83 int mc13xxx_reg_write(struct mc13xxx *mc13xxx, unsigned int offset, u32 val)
84 {
85 	dev_vdbg(mc13xxx->dev, "[0x%02x] <- 0x%06x\n", offset, val);
86 
87 	if (val >= BIT(24))
88 		return -EINVAL;
89 
90 	return regmap_write(mc13xxx->regmap, offset, val);
91 }
92 EXPORT_SYMBOL(mc13xxx_reg_write);
93 
94 int mc13xxx_reg_rmw(struct mc13xxx *mc13xxx, unsigned int offset,
95 		u32 mask, u32 val)
96 {
97 	BUG_ON(val & ~mask);
98 	dev_vdbg(mc13xxx->dev, "[0x%02x] <- 0x%06x (mask: 0x%06x)\n",
99 			offset, val, mask);
100 
101 	return regmap_update_bits(mc13xxx->regmap, offset, mask, val);
102 }
103 EXPORT_SYMBOL(mc13xxx_reg_rmw);
104 
105 int mc13xxx_irq_mask(struct mc13xxx *mc13xxx, int irq)
106 {
107 	int virq = regmap_irq_get_virq(mc13xxx->irq_data, irq);
108 
109 	disable_irq_nosync(virq);
110 
111 	return 0;
112 }
113 EXPORT_SYMBOL(mc13xxx_irq_mask);
114 
115 int mc13xxx_irq_unmask(struct mc13xxx *mc13xxx, int irq)
116 {
117 	int virq = regmap_irq_get_virq(mc13xxx->irq_data, irq);
118 
119 	enable_irq(virq);
120 
121 	return 0;
122 }
123 EXPORT_SYMBOL(mc13xxx_irq_unmask);
124 
125 int mc13xxx_irq_status(struct mc13xxx *mc13xxx, int irq,
126 		int *enabled, int *pending)
127 {
128 	int ret;
129 	unsigned int offmask = irq < 24 ? MC13XXX_IRQMASK0 : MC13XXX_IRQMASK1;
130 	unsigned int offstat = irq < 24 ? MC13XXX_IRQSTAT0 : MC13XXX_IRQSTAT1;
131 	u32 irqbit = 1 << (irq < 24 ? irq : irq - 24);
132 
133 	if (irq < 0 || irq >= ARRAY_SIZE(mc13xxx->irqs))
134 		return -EINVAL;
135 
136 	if (enabled) {
137 		u32 mask;
138 
139 		ret = mc13xxx_reg_read(mc13xxx, offmask, &mask);
140 		if (ret)
141 			return ret;
142 
143 		*enabled = mask & irqbit;
144 	}
145 
146 	if (pending) {
147 		u32 stat;
148 
149 		ret = mc13xxx_reg_read(mc13xxx, offstat, &stat);
150 		if (ret)
151 			return ret;
152 
153 		*pending = stat & irqbit;
154 	}
155 
156 	return 0;
157 }
158 EXPORT_SYMBOL(mc13xxx_irq_status);
159 
160 int mc13xxx_irq_request(struct mc13xxx *mc13xxx, int irq,
161 		irq_handler_t handler, const char *name, void *dev)
162 {
163 	int virq = regmap_irq_get_virq(mc13xxx->irq_data, irq);
164 
165 	return devm_request_threaded_irq(mc13xxx->dev, virq, NULL, handler,
166 					 0, name, dev);
167 }
168 EXPORT_SYMBOL(mc13xxx_irq_request);
169 
170 int mc13xxx_irq_free(struct mc13xxx *mc13xxx, int irq, void *dev)
171 {
172 	int virq = regmap_irq_get_virq(mc13xxx->irq_data, irq);
173 
174 	devm_free_irq(mc13xxx->dev, virq, dev);
175 
176 	return 0;
177 }
178 EXPORT_SYMBOL(mc13xxx_irq_free);
179 
180 #define maskval(reg, mask)	(((reg) & (mask)) >> __ffs(mask))
181 static void mc13xxx_print_revision(struct mc13xxx *mc13xxx, u32 revision)
182 {
183 	dev_info(mc13xxx->dev, "%s: rev: %d.%d, "
184 			"fin: %d, fab: %d, icid: %d/%d\n",
185 			mc13xxx->variant->name,
186 			maskval(revision, MC13XXX_REVISION_REVFULL),
187 			maskval(revision, MC13XXX_REVISION_REVMETAL),
188 			maskval(revision, MC13XXX_REVISION_FIN),
189 			maskval(revision, MC13XXX_REVISION_FAB),
190 			maskval(revision, MC13XXX_REVISION_ICID),
191 			maskval(revision, MC13XXX_REVISION_ICIDCODE));
192 }
193 
194 static void mc34708_print_revision(struct mc13xxx *mc13xxx, u32 revision)
195 {
196 	dev_info(mc13xxx->dev, "%s: rev %d.%d, fin: %d, fab: %d\n",
197 			mc13xxx->variant->name,
198 			maskval(revision, MC34708_REVISION_REVFULL),
199 			maskval(revision, MC34708_REVISION_REVMETAL),
200 			maskval(revision, MC34708_REVISION_FIN),
201 			maskval(revision, MC34708_REVISION_FAB));
202 }
203 
204 /* These are only exported for mc13xxx-i2c and mc13xxx-spi */
205 struct mc13xxx_variant mc13xxx_variant_mc13783 = {
206 	.name = "mc13783",
207 	.print_revision = mc13xxx_print_revision,
208 };
209 EXPORT_SYMBOL_GPL(mc13xxx_variant_mc13783);
210 
211 struct mc13xxx_variant mc13xxx_variant_mc13892 = {
212 	.name = "mc13892",
213 	.print_revision = mc13xxx_print_revision,
214 };
215 EXPORT_SYMBOL_GPL(mc13xxx_variant_mc13892);
216 
217 struct mc13xxx_variant mc13xxx_variant_mc34708 = {
218 	.name = "mc34708",
219 	.print_revision = mc34708_print_revision,
220 };
221 EXPORT_SYMBOL_GPL(mc13xxx_variant_mc34708);
222 
223 static const char *mc13xxx_get_chipname(struct mc13xxx *mc13xxx)
224 {
225 	return mc13xxx->variant->name;
226 }
227 
228 int mc13xxx_get_flags(struct mc13xxx *mc13xxx)
229 {
230 	return mc13xxx->flags;
231 }
232 EXPORT_SYMBOL(mc13xxx_get_flags);
233 
234 #define MC13XXX_ADC1_CHAN0_SHIFT	5
235 #define MC13XXX_ADC1_CHAN1_SHIFT	8
236 #define MC13783_ADC1_ATO_SHIFT		11
237 #define MC13783_ADC1_ATOX		(1 << 19)
238 
239 struct mc13xxx_adcdone_data {
240 	struct mc13xxx *mc13xxx;
241 	struct completion done;
242 };
243 
244 static irqreturn_t mc13xxx_handler_adcdone(int irq, void *data)
245 {
246 	struct mc13xxx_adcdone_data *adcdone_data = data;
247 
248 	complete_all(&adcdone_data->done);
249 
250 	return IRQ_HANDLED;
251 }
252 
253 #define MC13XXX_ADC_WORKING (1 << 0)
254 
255 int mc13xxx_adc_do_conversion(struct mc13xxx *mc13xxx, unsigned int mode,
256 		unsigned int channel, u8 ato, bool atox,
257 		unsigned int *sample)
258 {
259 	u32 adc0, adc1, old_adc0;
260 	int i, ret;
261 	struct mc13xxx_adcdone_data adcdone_data = {
262 		.mc13xxx = mc13xxx,
263 	};
264 	init_completion(&adcdone_data.done);
265 
266 	dev_dbg(mc13xxx->dev, "%s\n", __func__);
267 
268 	mc13xxx_lock(mc13xxx);
269 
270 	if (mc13xxx->adcflags & MC13XXX_ADC_WORKING) {
271 		ret = -EBUSY;
272 		goto out;
273 	}
274 
275 	mc13xxx->adcflags |= MC13XXX_ADC_WORKING;
276 
277 	mc13xxx_reg_read(mc13xxx, MC13XXX_ADC0, &old_adc0);
278 
279 	adc0 = MC13XXX_ADC0_ADINC1 | MC13XXX_ADC0_ADINC2;
280 	adc1 = MC13XXX_ADC1_ADEN | MC13XXX_ADC1_ADTRIGIGN | MC13XXX_ADC1_ASC;
281 
282 	if (channel > 7)
283 		adc1 |= MC13XXX_ADC1_ADSEL;
284 
285 	switch (mode) {
286 	case MC13XXX_ADC_MODE_TS:
287 		adc0 |= MC13XXX_ADC0_ADREFEN | MC13XXX_ADC0_TSMOD0 |
288 			MC13XXX_ADC0_TSMOD1;
289 		adc1 |= 4 << MC13XXX_ADC1_CHAN1_SHIFT;
290 		break;
291 
292 	case MC13XXX_ADC_MODE_SINGLE_CHAN:
293 		adc0 |= old_adc0 & MC13XXX_ADC0_CONFIG_MASK;
294 		adc1 |= (channel & 0x7) << MC13XXX_ADC1_CHAN0_SHIFT;
295 		adc1 |= MC13XXX_ADC1_RAND;
296 		break;
297 
298 	case MC13XXX_ADC_MODE_MULT_CHAN:
299 		adc0 |= old_adc0 & MC13XXX_ADC0_CONFIG_MASK;
300 		adc1 |= 4 << MC13XXX_ADC1_CHAN1_SHIFT;
301 		break;
302 
303 	default:
304 		mc13xxx_unlock(mc13xxx);
305 		return -EINVAL;
306 	}
307 
308 	adc1 |= ato << MC13783_ADC1_ATO_SHIFT;
309 	if (atox)
310 		adc1 |= MC13783_ADC1_ATOX;
311 
312 	dev_dbg(mc13xxx->dev, "%s: request irq\n", __func__);
313 	mc13xxx_irq_request(mc13xxx, MC13XXX_IRQ_ADCDONE,
314 			mc13xxx_handler_adcdone, __func__, &adcdone_data);
315 
316 	mc13xxx_reg_write(mc13xxx, MC13XXX_ADC0, adc0);
317 	mc13xxx_reg_write(mc13xxx, MC13XXX_ADC1, adc1);
318 
319 	mc13xxx_unlock(mc13xxx);
320 
321 	ret = wait_for_completion_interruptible_timeout(&adcdone_data.done, HZ);
322 
323 	if (!ret)
324 		ret = -ETIMEDOUT;
325 
326 	mc13xxx_lock(mc13xxx);
327 
328 	mc13xxx_irq_free(mc13xxx, MC13XXX_IRQ_ADCDONE, &adcdone_data);
329 
330 	if (ret > 0)
331 		for (i = 0; i < 4; ++i) {
332 			ret = mc13xxx_reg_read(mc13xxx,
333 					MC13XXX_ADC2, &sample[i]);
334 			if (ret)
335 				break;
336 		}
337 
338 	if (mode == MC13XXX_ADC_MODE_TS)
339 		/* restore TSMOD */
340 		mc13xxx_reg_write(mc13xxx, MC13XXX_ADC0, old_adc0);
341 
342 	mc13xxx->adcflags &= ~MC13XXX_ADC_WORKING;
343 out:
344 	mc13xxx_unlock(mc13xxx);
345 
346 	return ret;
347 }
348 EXPORT_SYMBOL_GPL(mc13xxx_adc_do_conversion);
349 
350 static int mc13xxx_add_subdevice_pdata(struct mc13xxx *mc13xxx,
351 		const char *format, void *pdata, size_t pdata_size)
352 {
353 	char buf[30];
354 	const char *name = mc13xxx_get_chipname(mc13xxx);
355 
356 	struct mfd_cell cell = {
357 		.platform_data = pdata,
358 		.pdata_size = pdata_size,
359 	};
360 
361 	/* there is no asnprintf in the kernel :-( */
362 	if (snprintf(buf, sizeof(buf), format, name) > sizeof(buf))
363 		return -E2BIG;
364 
365 	cell.name = kmemdup(buf, strlen(buf) + 1, GFP_KERNEL);
366 	if (!cell.name)
367 		return -ENOMEM;
368 
369 	return mfd_add_devices(mc13xxx->dev, -1, &cell, 1, NULL, 0,
370 			       regmap_irq_get_domain(mc13xxx->irq_data));
371 }
372 
373 static int mc13xxx_add_subdevice(struct mc13xxx *mc13xxx, const char *format)
374 {
375 	return mc13xxx_add_subdevice_pdata(mc13xxx, format, NULL, 0);
376 }
377 
378 #ifdef CONFIG_OF
379 static int mc13xxx_probe_flags_dt(struct mc13xxx *mc13xxx)
380 {
381 	struct device_node *np = mc13xxx->dev->of_node;
382 
383 	if (!np)
384 		return -ENODEV;
385 
386 	if (of_get_property(np, "fsl,mc13xxx-uses-adc", NULL))
387 		mc13xxx->flags |= MC13XXX_USE_ADC;
388 
389 	if (of_get_property(np, "fsl,mc13xxx-uses-codec", NULL))
390 		mc13xxx->flags |= MC13XXX_USE_CODEC;
391 
392 	if (of_get_property(np, "fsl,mc13xxx-uses-rtc", NULL))
393 		mc13xxx->flags |= MC13XXX_USE_RTC;
394 
395 	if (of_get_property(np, "fsl,mc13xxx-uses-touch", NULL))
396 		mc13xxx->flags |= MC13XXX_USE_TOUCHSCREEN;
397 
398 	return 0;
399 }
400 #else
401 static inline int mc13xxx_probe_flags_dt(struct mc13xxx *mc13xxx)
402 {
403 	return -ENODEV;
404 }
405 #endif
406 
407 int mc13xxx_common_init(struct device *dev)
408 {
409 	struct mc13xxx_platform_data *pdata = dev_get_platdata(dev);
410 	struct mc13xxx *mc13xxx = dev_get_drvdata(dev);
411 	u32 revision;
412 	int i, ret;
413 
414 	mc13xxx->dev = dev;
415 
416 	ret = mc13xxx_reg_read(mc13xxx, MC13XXX_REVISION, &revision);
417 	if (ret)
418 		return ret;
419 
420 	mc13xxx->variant->print_revision(mc13xxx, revision);
421 
422 	ret = mc13xxx_reg_rmw(mc13xxx, MC13XXX_PWRCTRL,
423 			MC13XXX_PWRCTRL_WDIRESET, MC13XXX_PWRCTRL_WDIRESET);
424 	if (ret)
425 		return ret;
426 
427 	for (i = 0; i < ARRAY_SIZE(mc13xxx->irqs); i++) {
428 		mc13xxx->irqs[i].reg_offset = i / MC13XXX_IRQ_PER_REG;
429 		mc13xxx->irqs[i].mask = BIT(i % MC13XXX_IRQ_PER_REG);
430 	}
431 
432 	mc13xxx->irq_chip.name = dev_name(dev);
433 	mc13xxx->irq_chip.status_base = MC13XXX_IRQSTAT0;
434 	mc13xxx->irq_chip.mask_base = MC13XXX_IRQMASK0;
435 	mc13xxx->irq_chip.ack_base = MC13XXX_IRQSTAT0;
436 	mc13xxx->irq_chip.irq_reg_stride = MC13XXX_IRQSTAT1 - MC13XXX_IRQSTAT0;
437 	mc13xxx->irq_chip.init_ack_masked = true;
438 	mc13xxx->irq_chip.use_ack = true;
439 	mc13xxx->irq_chip.num_regs = MC13XXX_IRQ_REG_CNT;
440 	mc13xxx->irq_chip.irqs = mc13xxx->irqs;
441 	mc13xxx->irq_chip.num_irqs = ARRAY_SIZE(mc13xxx->irqs);
442 
443 	ret = regmap_add_irq_chip(mc13xxx->regmap, mc13xxx->irq, IRQF_ONESHOT,
444 				  0, &mc13xxx->irq_chip, &mc13xxx->irq_data);
445 	if (ret)
446 		return ret;
447 
448 	mutex_init(&mc13xxx->lock);
449 
450 	if (mc13xxx_probe_flags_dt(mc13xxx) < 0 && pdata)
451 		mc13xxx->flags = pdata->flags;
452 
453 	if (pdata) {
454 		mc13xxx_add_subdevice_pdata(mc13xxx, "%s-regulator",
455 			&pdata->regulators, sizeof(pdata->regulators));
456 		mc13xxx_add_subdevice_pdata(mc13xxx, "%s-led",
457 				pdata->leds, sizeof(*pdata->leds));
458 		mc13xxx_add_subdevice_pdata(mc13xxx, "%s-pwrbutton",
459 				pdata->buttons, sizeof(*pdata->buttons));
460 		if (mc13xxx->flags & MC13XXX_USE_CODEC)
461 			mc13xxx_add_subdevice_pdata(mc13xxx, "%s-codec",
462 				pdata->codec, sizeof(*pdata->codec));
463 		if (mc13xxx->flags & MC13XXX_USE_TOUCHSCREEN)
464 			mc13xxx_add_subdevice_pdata(mc13xxx, "%s-ts",
465 				&pdata->touch, sizeof(pdata->touch));
466 	} else {
467 		mc13xxx_add_subdevice(mc13xxx, "%s-regulator");
468 		mc13xxx_add_subdevice(mc13xxx, "%s-led");
469 		mc13xxx_add_subdevice(mc13xxx, "%s-pwrbutton");
470 		if (mc13xxx->flags & MC13XXX_USE_CODEC)
471 			mc13xxx_add_subdevice(mc13xxx, "%s-codec");
472 		if (mc13xxx->flags & MC13XXX_USE_TOUCHSCREEN)
473 			mc13xxx_add_subdevice(mc13xxx, "%s-ts");
474 	}
475 
476 	if (mc13xxx->flags & MC13XXX_USE_ADC)
477 		mc13xxx_add_subdevice(mc13xxx, "%s-adc");
478 
479 	if (mc13xxx->flags & MC13XXX_USE_RTC)
480 		mc13xxx_add_subdevice(mc13xxx, "%s-rtc");
481 
482 	return 0;
483 }
484 EXPORT_SYMBOL_GPL(mc13xxx_common_init);
485 
486 int mc13xxx_common_exit(struct device *dev)
487 {
488 	struct mc13xxx *mc13xxx = dev_get_drvdata(dev);
489 
490 	mfd_remove_devices(dev);
491 	regmap_del_irq_chip(mc13xxx->irq, mc13xxx->irq_data);
492 	mutex_destroy(&mc13xxx->lock);
493 
494 	return 0;
495 }
496 EXPORT_SYMBOL_GPL(mc13xxx_common_exit);
497 
498 MODULE_DESCRIPTION("Core driver for Freescale MC13XXX PMIC");
499 MODULE_AUTHOR("Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de>");
500 MODULE_LICENSE("GPL v2");
501