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c942fddf | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
6dd112b9 KS |
2 | /* |
3 | * Freescale MXS LRADC ADC driver | |
4 | * | |
5 | * Copyright (c) 2012 DENX Software Engineering, GmbH. | |
6 | * Copyright (c) 2017 Ksenija Stanojevic <ksenija.stanojevic@gmail.com> | |
7 | * | |
8 | * Authors: | |
9 | * Marek Vasut <marex@denx.de> | |
10 | * Ksenija Stanojevic <ksenija.stanojevic@gmail.com> | |
6dd112b9 KS |
11 | */ |
12 | ||
13 | #include <linux/completion.h> | |
14 | #include <linux/device.h> | |
15 | #include <linux/err.h> | |
16 | #include <linux/interrupt.h> | |
17 | #include <linux/mfd/core.h> | |
18 | #include <linux/mfd/mxs-lradc.h> | |
19 | #include <linux/module.h> | |
20 | #include <linux/of_irq.h> | |
21 | #include <linux/platform_device.h> | |
22 | #include <linux/sysfs.h> | |
23 | ||
24 | #include <linux/iio/buffer.h> | |
25 | #include <linux/iio/iio.h> | |
26 | #include <linux/iio/trigger.h> | |
27 | #include <linux/iio/trigger_consumer.h> | |
28 | #include <linux/iio/triggered_buffer.h> | |
29 | #include <linux/iio/sysfs.h> | |
30 | ||
31 | /* | |
32 | * Make this runtime configurable if necessary. Currently, if the buffered mode | |
33 | * is enabled, the LRADC takes LRADC_DELAY_TIMER_LOOP samples of data before | |
34 | * triggering IRQ. The sampling happens every (LRADC_DELAY_TIMER_PER / 2000) | |
35 | * seconds. The result is that the samples arrive every 500mS. | |
36 | */ | |
37 | #define LRADC_DELAY_TIMER_PER 200 | |
38 | #define LRADC_DELAY_TIMER_LOOP 5 | |
39 | ||
40 | #define VREF_MV_BASE 1850 | |
41 | ||
f4f93bf7 | 42 | static const char *mx23_lradc_adc_irq_names[] = { |
6dd112b9 KS |
43 | "mxs-lradc-channel0", |
44 | "mxs-lradc-channel1", | |
45 | "mxs-lradc-channel2", | |
46 | "mxs-lradc-channel3", | |
47 | "mxs-lradc-channel4", | |
48 | "mxs-lradc-channel5", | |
49 | }; | |
50 | ||
f4f93bf7 | 51 | static const char *mx28_lradc_adc_irq_names[] = { |
6dd112b9 KS |
52 | "mxs-lradc-thresh0", |
53 | "mxs-lradc-thresh1", | |
54 | "mxs-lradc-channel0", | |
55 | "mxs-lradc-channel1", | |
56 | "mxs-lradc-channel2", | |
57 | "mxs-lradc-channel3", | |
58 | "mxs-lradc-channel4", | |
59 | "mxs-lradc-channel5", | |
60 | "mxs-lradc-button0", | |
61 | "mxs-lradc-button1", | |
62 | }; | |
63 | ||
64 | static const u32 mxs_lradc_adc_vref_mv[][LRADC_MAX_TOTAL_CHANS] = { | |
65 | [IMX23_LRADC] = { | |
66 | VREF_MV_BASE, /* CH0 */ | |
67 | VREF_MV_BASE, /* CH1 */ | |
68 | VREF_MV_BASE, /* CH2 */ | |
69 | VREF_MV_BASE, /* CH3 */ | |
70 | VREF_MV_BASE, /* CH4 */ | |
71 | VREF_MV_BASE, /* CH5 */ | |
72 | VREF_MV_BASE * 2, /* CH6 VDDIO */ | |
73 | VREF_MV_BASE * 4, /* CH7 VBATT */ | |
74 | VREF_MV_BASE, /* CH8 Temp sense 0 */ | |
75 | VREF_MV_BASE, /* CH9 Temp sense 1 */ | |
76 | VREF_MV_BASE, /* CH10 */ | |
77 | VREF_MV_BASE, /* CH11 */ | |
78 | VREF_MV_BASE, /* CH12 USB_DP */ | |
79 | VREF_MV_BASE, /* CH13 USB_DN */ | |
80 | VREF_MV_BASE, /* CH14 VBG */ | |
81 | VREF_MV_BASE * 4, /* CH15 VDD5V */ | |
82 | }, | |
83 | [IMX28_LRADC] = { | |
84 | VREF_MV_BASE, /* CH0 */ | |
85 | VREF_MV_BASE, /* CH1 */ | |
86 | VREF_MV_BASE, /* CH2 */ | |
87 | VREF_MV_BASE, /* CH3 */ | |
88 | VREF_MV_BASE, /* CH4 */ | |
89 | VREF_MV_BASE, /* CH5 */ | |
90 | VREF_MV_BASE, /* CH6 */ | |
91 | VREF_MV_BASE * 4, /* CH7 VBATT */ | |
92 | VREF_MV_BASE, /* CH8 Temp sense 0 */ | |
93 | VREF_MV_BASE, /* CH9 Temp sense 1 */ | |
94 | VREF_MV_BASE * 2, /* CH10 VDDIO */ | |
95 | VREF_MV_BASE, /* CH11 VTH */ | |
96 | VREF_MV_BASE * 2, /* CH12 VDDA */ | |
97 | VREF_MV_BASE, /* CH13 VDDD */ | |
98 | VREF_MV_BASE, /* CH14 VBG */ | |
99 | VREF_MV_BASE * 4, /* CH15 VDD5V */ | |
100 | }, | |
101 | }; | |
102 | ||
103 | enum mxs_lradc_divbytwo { | |
104 | MXS_LRADC_DIV_DISABLED = 0, | |
105 | MXS_LRADC_DIV_ENABLED, | |
106 | }; | |
107 | ||
108 | struct mxs_lradc_scale { | |
109 | unsigned int integer; | |
110 | unsigned int nano; | |
111 | }; | |
112 | ||
113 | struct mxs_lradc_adc { | |
114 | struct mxs_lradc *lradc; | |
115 | struct device *dev; | |
116 | ||
117 | void __iomem *base; | |
118 | u32 buffer[10]; | |
119 | struct iio_trigger *trig; | |
120 | struct completion completion; | |
121 | spinlock_t lock; | |
122 | ||
123 | const u32 *vref_mv; | |
124 | struct mxs_lradc_scale scale_avail[LRADC_MAX_TOTAL_CHANS][2]; | |
125 | unsigned long is_divided; | |
126 | }; | |
127 | ||
128 | ||
129 | /* Raw I/O operations */ | |
130 | static int mxs_lradc_adc_read_single(struct iio_dev *iio_dev, int chan, | |
131 | int *val) | |
132 | { | |
133 | struct mxs_lradc_adc *adc = iio_priv(iio_dev); | |
134 | struct mxs_lradc *lradc = adc->lradc; | |
135 | int ret; | |
136 | ||
137 | /* | |
138 | * See if there is no buffered operation in progress. If there is simply | |
139 | * bail out. This can be improved to support both buffered and raw IO at | |
140 | * the same time, yet the code becomes horribly complicated. Therefore I | |
141 | * applied KISS principle here. | |
142 | */ | |
143 | ret = iio_device_claim_direct_mode(iio_dev); | |
144 | if (ret) | |
145 | return ret; | |
146 | ||
147 | reinit_completion(&adc->completion); | |
148 | ||
149 | /* | |
150 | * No buffered operation in progress, map the channel and trigger it. | |
151 | * Virtual channel 0 is always used here as the others are always not | |
152 | * used if doing raw sampling. | |
153 | */ | |
154 | if (lradc->soc == IMX28_LRADC) | |
155 | writel(LRADC_CTRL1_LRADC_IRQ_EN(0), | |
156 | adc->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR); | |
157 | writel(0x1, adc->base + LRADC_CTRL0 + STMP_OFFSET_REG_CLR); | |
158 | ||
159 | /* Enable / disable the divider per requirement */ | |
160 | if (test_bit(chan, &adc->is_divided)) | |
161 | writel(1 << LRADC_CTRL2_DIVIDE_BY_TWO_OFFSET, | |
162 | adc->base + LRADC_CTRL2 + STMP_OFFSET_REG_SET); | |
163 | else | |
164 | writel(1 << LRADC_CTRL2_DIVIDE_BY_TWO_OFFSET, | |
165 | adc->base + LRADC_CTRL2 + STMP_OFFSET_REG_CLR); | |
166 | ||
167 | /* Clean the slot's previous content, then set new one. */ | |
168 | writel(LRADC_CTRL4_LRADCSELECT_MASK(0), | |
169 | adc->base + LRADC_CTRL4 + STMP_OFFSET_REG_CLR); | |
170 | writel(chan, adc->base + LRADC_CTRL4 + STMP_OFFSET_REG_SET); | |
171 | ||
172 | writel(0, adc->base + LRADC_CH(0)); | |
173 | ||
174 | /* Enable the IRQ and start sampling the channel. */ | |
175 | writel(LRADC_CTRL1_LRADC_IRQ_EN(0), | |
176 | adc->base + LRADC_CTRL1 + STMP_OFFSET_REG_SET); | |
177 | writel(BIT(0), adc->base + LRADC_CTRL0 + STMP_OFFSET_REG_SET); | |
178 | ||
179 | /* Wait for completion on the channel, 1 second max. */ | |
180 | ret = wait_for_completion_killable_timeout(&adc->completion, HZ); | |
181 | if (!ret) | |
182 | ret = -ETIMEDOUT; | |
183 | if (ret < 0) | |
184 | goto err; | |
185 | ||
186 | /* Read the data. */ | |
187 | *val = readl(adc->base + LRADC_CH(0)) & LRADC_CH_VALUE_MASK; | |
188 | ret = IIO_VAL_INT; | |
189 | ||
190 | err: | |
191 | writel(LRADC_CTRL1_LRADC_IRQ_EN(0), | |
192 | adc->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR); | |
193 | ||
194 | iio_device_release_direct_mode(iio_dev); | |
195 | ||
196 | return ret; | |
197 | } | |
198 | ||
199 | static int mxs_lradc_adc_read_temp(struct iio_dev *iio_dev, int *val) | |
200 | { | |
201 | int ret, min, max; | |
202 | ||
203 | ret = mxs_lradc_adc_read_single(iio_dev, 8, &min); | |
204 | if (ret != IIO_VAL_INT) | |
205 | return ret; | |
206 | ||
207 | ret = mxs_lradc_adc_read_single(iio_dev, 9, &max); | |
208 | if (ret != IIO_VAL_INT) | |
209 | return ret; | |
210 | ||
211 | *val = max - min; | |
212 | ||
213 | return IIO_VAL_INT; | |
214 | } | |
215 | ||
216 | static int mxs_lradc_adc_read_raw(struct iio_dev *iio_dev, | |
217 | const struct iio_chan_spec *chan, | |
218 | int *val, int *val2, long m) | |
219 | { | |
220 | struct mxs_lradc_adc *adc = iio_priv(iio_dev); | |
221 | ||
222 | switch (m) { | |
223 | case IIO_CHAN_INFO_RAW: | |
224 | if (chan->type == IIO_TEMP) | |
225 | return mxs_lradc_adc_read_temp(iio_dev, val); | |
226 | ||
227 | return mxs_lradc_adc_read_single(iio_dev, chan->channel, val); | |
228 | ||
229 | case IIO_CHAN_INFO_SCALE: | |
230 | if (chan->type == IIO_TEMP) { | |
231 | /* | |
232 | * From the datasheet, we have to multiply by 1.012 and | |
233 | * divide by 4 | |
234 | */ | |
235 | *val = 0; | |
236 | *val2 = 253000; | |
237 | return IIO_VAL_INT_PLUS_MICRO; | |
238 | } | |
239 | ||
240 | *val = adc->vref_mv[chan->channel]; | |
241 | *val2 = chan->scan_type.realbits - | |
242 | test_bit(chan->channel, &adc->is_divided); | |
243 | return IIO_VAL_FRACTIONAL_LOG2; | |
244 | ||
245 | case IIO_CHAN_INFO_OFFSET: | |
246 | if (chan->type == IIO_TEMP) { | |
247 | /* | |
248 | * The calculated value from the ADC is in Kelvin, we | |
249 | * want Celsius for hwmon so the offset is -273.15 | |
250 | * The offset is applied before scaling so it is | |
251 | * actually -213.15 * 4 / 1.012 = -1079.644268 | |
252 | */ | |
253 | *val = -1079; | |
254 | *val2 = 644268; | |
255 | ||
256 | return IIO_VAL_INT_PLUS_MICRO; | |
257 | } | |
258 | ||
259 | return -EINVAL; | |
260 | ||
261 | default: | |
262 | break; | |
263 | } | |
264 | ||
265 | return -EINVAL; | |
266 | } | |
267 | ||
268 | static int mxs_lradc_adc_write_raw(struct iio_dev *iio_dev, | |
269 | const struct iio_chan_spec *chan, | |
270 | int val, int val2, long m) | |
271 | { | |
272 | struct mxs_lradc_adc *adc = iio_priv(iio_dev); | |
273 | struct mxs_lradc_scale *scale_avail = | |
274 | adc->scale_avail[chan->channel]; | |
275 | int ret; | |
276 | ||
277 | ret = iio_device_claim_direct_mode(iio_dev); | |
278 | if (ret) | |
279 | return ret; | |
280 | ||
281 | switch (m) { | |
282 | case IIO_CHAN_INFO_SCALE: | |
283 | ret = -EINVAL; | |
284 | if (val == scale_avail[MXS_LRADC_DIV_DISABLED].integer && | |
285 | val2 == scale_avail[MXS_LRADC_DIV_DISABLED].nano) { | |
286 | /* divider by two disabled */ | |
287 | clear_bit(chan->channel, &adc->is_divided); | |
288 | ret = 0; | |
289 | } else if (val == scale_avail[MXS_LRADC_DIV_ENABLED].integer && | |
290 | val2 == scale_avail[MXS_LRADC_DIV_ENABLED].nano) { | |
291 | /* divider by two enabled */ | |
292 | set_bit(chan->channel, &adc->is_divided); | |
293 | ret = 0; | |
294 | } | |
295 | ||
296 | break; | |
297 | default: | |
298 | ret = -EINVAL; | |
299 | break; | |
300 | } | |
301 | ||
302 | iio_device_release_direct_mode(iio_dev); | |
303 | ||
304 | return ret; | |
305 | } | |
306 | ||
307 | static int mxs_lradc_adc_write_raw_get_fmt(struct iio_dev *iio_dev, | |
308 | const struct iio_chan_spec *chan, | |
309 | long m) | |
310 | { | |
311 | return IIO_VAL_INT_PLUS_NANO; | |
312 | } | |
313 | ||
314 | static ssize_t mxs_lradc_adc_show_scale_avail(struct device *dev, | |
315 | struct device_attribute *attr, | |
316 | char *buf) | |
317 | { | |
318 | struct iio_dev *iio = dev_to_iio_dev(dev); | |
319 | struct mxs_lradc_adc *adc = iio_priv(iio); | |
320 | struct iio_dev_attr *iio_attr = to_iio_dev_attr(attr); | |
321 | int i, ch, len = 0; | |
322 | ||
323 | ch = iio_attr->address; | |
324 | for (i = 0; i < ARRAY_SIZE(adc->scale_avail[ch]); i++) | |
325 | len += sprintf(buf + len, "%u.%09u ", | |
326 | adc->scale_avail[ch][i].integer, | |
327 | adc->scale_avail[ch][i].nano); | |
328 | ||
329 | len += sprintf(buf + len, "\n"); | |
330 | ||
331 | return len; | |
332 | } | |
333 | ||
334 | #define SHOW_SCALE_AVAILABLE_ATTR(ch)\ | |
335 | IIO_DEVICE_ATTR(in_voltage##ch##_scale_available, 0444,\ | |
336 | mxs_lradc_adc_show_scale_avail, NULL, ch) | |
337 | ||
f4f93bf7 PC |
338 | static SHOW_SCALE_AVAILABLE_ATTR(0); |
339 | static SHOW_SCALE_AVAILABLE_ATTR(1); | |
340 | static SHOW_SCALE_AVAILABLE_ATTR(2); | |
341 | static SHOW_SCALE_AVAILABLE_ATTR(3); | |
342 | static SHOW_SCALE_AVAILABLE_ATTR(4); | |
343 | static SHOW_SCALE_AVAILABLE_ATTR(5); | |
344 | static SHOW_SCALE_AVAILABLE_ATTR(6); | |
345 | static SHOW_SCALE_AVAILABLE_ATTR(7); | |
346 | static SHOW_SCALE_AVAILABLE_ATTR(10); | |
347 | static SHOW_SCALE_AVAILABLE_ATTR(11); | |
348 | static SHOW_SCALE_AVAILABLE_ATTR(12); | |
349 | static SHOW_SCALE_AVAILABLE_ATTR(13); | |
350 | static SHOW_SCALE_AVAILABLE_ATTR(14); | |
351 | static SHOW_SCALE_AVAILABLE_ATTR(15); | |
6dd112b9 KS |
352 | |
353 | static struct attribute *mxs_lradc_adc_attributes[] = { | |
354 | &iio_dev_attr_in_voltage0_scale_available.dev_attr.attr, | |
355 | &iio_dev_attr_in_voltage1_scale_available.dev_attr.attr, | |
356 | &iio_dev_attr_in_voltage2_scale_available.dev_attr.attr, | |
357 | &iio_dev_attr_in_voltage3_scale_available.dev_attr.attr, | |
358 | &iio_dev_attr_in_voltage4_scale_available.dev_attr.attr, | |
359 | &iio_dev_attr_in_voltage5_scale_available.dev_attr.attr, | |
360 | &iio_dev_attr_in_voltage6_scale_available.dev_attr.attr, | |
361 | &iio_dev_attr_in_voltage7_scale_available.dev_attr.attr, | |
362 | &iio_dev_attr_in_voltage10_scale_available.dev_attr.attr, | |
363 | &iio_dev_attr_in_voltage11_scale_available.dev_attr.attr, | |
364 | &iio_dev_attr_in_voltage12_scale_available.dev_attr.attr, | |
365 | &iio_dev_attr_in_voltage13_scale_available.dev_attr.attr, | |
366 | &iio_dev_attr_in_voltage14_scale_available.dev_attr.attr, | |
367 | &iio_dev_attr_in_voltage15_scale_available.dev_attr.attr, | |
368 | NULL | |
369 | }; | |
370 | ||
371 | static const struct attribute_group mxs_lradc_adc_attribute_group = { | |
372 | .attrs = mxs_lradc_adc_attributes, | |
373 | }; | |
374 | ||
375 | static const struct iio_info mxs_lradc_adc_iio_info = { | |
6dd112b9 KS |
376 | .read_raw = mxs_lradc_adc_read_raw, |
377 | .write_raw = mxs_lradc_adc_write_raw, | |
378 | .write_raw_get_fmt = mxs_lradc_adc_write_raw_get_fmt, | |
379 | .attrs = &mxs_lradc_adc_attribute_group, | |
380 | }; | |
381 | ||
382 | /* IRQ Handling */ | |
383 | static irqreturn_t mxs_lradc_adc_handle_irq(int irq, void *data) | |
384 | { | |
385 | struct iio_dev *iio = data; | |
386 | struct mxs_lradc_adc *adc = iio_priv(iio); | |
387 | struct mxs_lradc *lradc = adc->lradc; | |
388 | unsigned long reg = readl(adc->base + LRADC_CTRL1); | |
389 | unsigned long flags; | |
390 | ||
391 | if (!(reg & mxs_lradc_irq_mask(lradc))) | |
392 | return IRQ_NONE; | |
393 | ||
394 | if (iio_buffer_enabled(iio)) { | |
395 | if (reg & lradc->buffer_vchans) { | |
396 | spin_lock_irqsave(&adc->lock, flags); | |
397 | iio_trigger_poll(iio->trig); | |
398 | spin_unlock_irqrestore(&adc->lock, flags); | |
399 | } | |
400 | } else if (reg & LRADC_CTRL1_LRADC_IRQ(0)) { | |
401 | complete(&adc->completion); | |
402 | } | |
403 | ||
404 | writel(reg & mxs_lradc_irq_mask(lradc), | |
405 | adc->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR); | |
406 | ||
407 | return IRQ_HANDLED; | |
408 | } | |
409 | ||
410 | ||
411 | /* Trigger handling */ | |
412 | static irqreturn_t mxs_lradc_adc_trigger_handler(int irq, void *p) | |
413 | { | |
414 | struct iio_poll_func *pf = p; | |
415 | struct iio_dev *iio = pf->indio_dev; | |
416 | struct mxs_lradc_adc *adc = iio_priv(iio); | |
417 | const u32 chan_value = LRADC_CH_ACCUMULATE | | |
418 | ((LRADC_DELAY_TIMER_LOOP - 1) << LRADC_CH_NUM_SAMPLES_OFFSET); | |
419 | unsigned int i, j = 0; | |
420 | ||
421 | for_each_set_bit(i, iio->active_scan_mask, LRADC_MAX_TOTAL_CHANS) { | |
422 | adc->buffer[j] = readl(adc->base + LRADC_CH(j)); | |
423 | writel(chan_value, adc->base + LRADC_CH(j)); | |
424 | adc->buffer[j] &= LRADC_CH_VALUE_MASK; | |
425 | adc->buffer[j] /= LRADC_DELAY_TIMER_LOOP; | |
426 | j++; | |
427 | } | |
428 | ||
429 | iio_push_to_buffers_with_timestamp(iio, adc->buffer, pf->timestamp); | |
430 | ||
431 | iio_trigger_notify_done(iio->trig); | |
432 | ||
433 | return IRQ_HANDLED; | |
434 | } | |
435 | ||
436 | static int mxs_lradc_adc_configure_trigger(struct iio_trigger *trig, bool state) | |
437 | { | |
438 | struct iio_dev *iio = iio_trigger_get_drvdata(trig); | |
439 | struct mxs_lradc_adc *adc = iio_priv(iio); | |
440 | const u32 st = state ? STMP_OFFSET_REG_SET : STMP_OFFSET_REG_CLR; | |
441 | ||
442 | writel(LRADC_DELAY_KICK, adc->base + (LRADC_DELAY(0) + st)); | |
443 | ||
444 | return 0; | |
445 | } | |
446 | ||
447 | static const struct iio_trigger_ops mxs_lradc_adc_trigger_ops = { | |
6dd112b9 KS |
448 | .set_trigger_state = &mxs_lradc_adc_configure_trigger, |
449 | }; | |
450 | ||
451 | static int mxs_lradc_adc_trigger_init(struct iio_dev *iio) | |
452 | { | |
453 | int ret; | |
454 | struct iio_trigger *trig; | |
455 | struct mxs_lradc_adc *adc = iio_priv(iio); | |
456 | ||
457 | trig = devm_iio_trigger_alloc(&iio->dev, "%s-dev%i", iio->name, | |
458 | iio->id); | |
13814627 KL |
459 | if (!trig) |
460 | return -ENOMEM; | |
6dd112b9 KS |
461 | |
462 | trig->dev.parent = adc->dev; | |
463 | iio_trigger_set_drvdata(trig, iio); | |
464 | trig->ops = &mxs_lradc_adc_trigger_ops; | |
465 | ||
466 | ret = iio_trigger_register(trig); | |
467 | if (ret) | |
468 | return ret; | |
469 | ||
470 | adc->trig = trig; | |
471 | ||
472 | return 0; | |
473 | } | |
474 | ||
475 | static void mxs_lradc_adc_trigger_remove(struct iio_dev *iio) | |
476 | { | |
477 | struct mxs_lradc_adc *adc = iio_priv(iio); | |
478 | ||
479 | iio_trigger_unregister(adc->trig); | |
480 | } | |
481 | ||
482 | static int mxs_lradc_adc_buffer_preenable(struct iio_dev *iio) | |
483 | { | |
484 | struct mxs_lradc_adc *adc = iio_priv(iio); | |
485 | struct mxs_lradc *lradc = adc->lradc; | |
486 | int chan, ofs = 0; | |
487 | unsigned long enable = 0; | |
488 | u32 ctrl4_set = 0; | |
489 | u32 ctrl4_clr = 0; | |
490 | u32 ctrl1_irq = 0; | |
491 | const u32 chan_value = LRADC_CH_ACCUMULATE | | |
492 | ((LRADC_DELAY_TIMER_LOOP - 1) << LRADC_CH_NUM_SAMPLES_OFFSET); | |
493 | ||
494 | if (lradc->soc == IMX28_LRADC) | |
495 | writel(lradc->buffer_vchans << LRADC_CTRL1_LRADC_IRQ_EN_OFFSET, | |
496 | adc->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR); | |
497 | writel(lradc->buffer_vchans, | |
498 | adc->base + LRADC_CTRL0 + STMP_OFFSET_REG_CLR); | |
499 | ||
500 | for_each_set_bit(chan, iio->active_scan_mask, LRADC_MAX_TOTAL_CHANS) { | |
501 | ctrl4_set |= chan << LRADC_CTRL4_LRADCSELECT_OFFSET(ofs); | |
502 | ctrl4_clr |= LRADC_CTRL4_LRADCSELECT_MASK(ofs); | |
503 | ctrl1_irq |= LRADC_CTRL1_LRADC_IRQ_EN(ofs); | |
504 | writel(chan_value, adc->base + LRADC_CH(ofs)); | |
505 | bitmap_set(&enable, ofs, 1); | |
506 | ofs++; | |
507 | } | |
508 | ||
509 | writel(LRADC_DELAY_TRIGGER_LRADCS_MASK | LRADC_DELAY_KICK, | |
510 | adc->base + LRADC_DELAY(0) + STMP_OFFSET_REG_CLR); | |
511 | writel(ctrl4_clr, adc->base + LRADC_CTRL4 + STMP_OFFSET_REG_CLR); | |
512 | writel(ctrl4_set, adc->base + LRADC_CTRL4 + STMP_OFFSET_REG_SET); | |
513 | writel(ctrl1_irq, adc->base + LRADC_CTRL1 + STMP_OFFSET_REG_SET); | |
514 | writel(enable << LRADC_DELAY_TRIGGER_LRADCS_OFFSET, | |
515 | adc->base + LRADC_DELAY(0) + STMP_OFFSET_REG_SET); | |
516 | ||
517 | return 0; | |
518 | } | |
519 | ||
520 | static int mxs_lradc_adc_buffer_postdisable(struct iio_dev *iio) | |
521 | { | |
522 | struct mxs_lradc_adc *adc = iio_priv(iio); | |
523 | struct mxs_lradc *lradc = adc->lradc; | |
524 | ||
525 | writel(LRADC_DELAY_TRIGGER_LRADCS_MASK | LRADC_DELAY_KICK, | |
526 | adc->base + LRADC_DELAY(0) + STMP_OFFSET_REG_CLR); | |
527 | ||
528 | writel(lradc->buffer_vchans, | |
529 | adc->base + LRADC_CTRL0 + STMP_OFFSET_REG_CLR); | |
530 | if (lradc->soc == IMX28_LRADC) | |
531 | writel(lradc->buffer_vchans << LRADC_CTRL1_LRADC_IRQ_EN_OFFSET, | |
532 | adc->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR); | |
533 | ||
534 | return 0; | |
535 | } | |
536 | ||
537 | static bool mxs_lradc_adc_validate_scan_mask(struct iio_dev *iio, | |
538 | const unsigned long *mask) | |
539 | { | |
540 | struct mxs_lradc_adc *adc = iio_priv(iio); | |
541 | struct mxs_lradc *lradc = adc->lradc; | |
542 | const int map_chans = bitmap_weight(mask, LRADC_MAX_TOTAL_CHANS); | |
543 | int rsvd_chans = 0; | |
544 | unsigned long rsvd_mask = 0; | |
545 | ||
546 | if (lradc->use_touchbutton) | |
547 | rsvd_mask |= CHAN_MASK_TOUCHBUTTON; | |
548 | if (lradc->touchscreen_wire == MXS_LRADC_TOUCHSCREEN_4WIRE) | |
549 | rsvd_mask |= CHAN_MASK_TOUCHSCREEN_4WIRE; | |
550 | if (lradc->touchscreen_wire == MXS_LRADC_TOUCHSCREEN_5WIRE) | |
551 | rsvd_mask |= CHAN_MASK_TOUCHSCREEN_5WIRE; | |
552 | ||
553 | if (lradc->use_touchbutton) | |
554 | rsvd_chans++; | |
555 | if (lradc->touchscreen_wire) | |
556 | rsvd_chans += 2; | |
557 | ||
558 | /* Test for attempts to map channels with special mode of operation. */ | |
559 | if (bitmap_intersects(mask, &rsvd_mask, LRADC_MAX_TOTAL_CHANS)) | |
560 | return false; | |
561 | ||
562 | /* Test for attempts to map more channels then available slots. */ | |
563 | if (map_chans + rsvd_chans > LRADC_MAX_MAPPED_CHANS) | |
564 | return false; | |
565 | ||
566 | return true; | |
567 | } | |
568 | ||
569 | static const struct iio_buffer_setup_ops mxs_lradc_adc_buffer_ops = { | |
570 | .preenable = &mxs_lradc_adc_buffer_preenable, | |
571 | .postenable = &iio_triggered_buffer_postenable, | |
572 | .predisable = &iio_triggered_buffer_predisable, | |
573 | .postdisable = &mxs_lradc_adc_buffer_postdisable, | |
574 | .validate_scan_mask = &mxs_lradc_adc_validate_scan_mask, | |
575 | }; | |
576 | ||
577 | /* Driver initialization */ | |
578 | #define MXS_ADC_CHAN(idx, chan_type, name) { \ | |
579 | .type = (chan_type), \ | |
580 | .indexed = 1, \ | |
581 | .scan_index = (idx), \ | |
582 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ | |
583 | BIT(IIO_CHAN_INFO_SCALE), \ | |
584 | .channel = (idx), \ | |
585 | .address = (idx), \ | |
586 | .scan_type = { \ | |
587 | .sign = 'u', \ | |
588 | .realbits = LRADC_RESOLUTION, \ | |
589 | .storagebits = 32, \ | |
590 | }, \ | |
591 | .datasheet_name = (name), \ | |
592 | } | |
593 | ||
594 | static const struct iio_chan_spec mx23_lradc_chan_spec[] = { | |
595 | MXS_ADC_CHAN(0, IIO_VOLTAGE, "LRADC0"), | |
596 | MXS_ADC_CHAN(1, IIO_VOLTAGE, "LRADC1"), | |
597 | MXS_ADC_CHAN(2, IIO_VOLTAGE, "LRADC2"), | |
598 | MXS_ADC_CHAN(3, IIO_VOLTAGE, "LRADC3"), | |
599 | MXS_ADC_CHAN(4, IIO_VOLTAGE, "LRADC4"), | |
600 | MXS_ADC_CHAN(5, IIO_VOLTAGE, "LRADC5"), | |
601 | MXS_ADC_CHAN(6, IIO_VOLTAGE, "VDDIO"), | |
602 | MXS_ADC_CHAN(7, IIO_VOLTAGE, "VBATT"), | |
603 | /* Combined Temperature sensors */ | |
604 | { | |
605 | .type = IIO_TEMP, | |
606 | .indexed = 1, | |
607 | .scan_index = 8, | |
608 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | | |
609 | BIT(IIO_CHAN_INFO_OFFSET) | | |
610 | BIT(IIO_CHAN_INFO_SCALE), | |
611 | .channel = 8, | |
612 | .scan_type = {.sign = 'u', .realbits = 18, .storagebits = 32,}, | |
613 | .datasheet_name = "TEMP_DIE", | |
614 | }, | |
615 | /* Hidden channel to keep indexes */ | |
616 | { | |
617 | .type = IIO_TEMP, | |
618 | .indexed = 1, | |
619 | .scan_index = -1, | |
620 | .channel = 9, | |
621 | }, | |
622 | MXS_ADC_CHAN(10, IIO_VOLTAGE, NULL), | |
623 | MXS_ADC_CHAN(11, IIO_VOLTAGE, NULL), | |
624 | MXS_ADC_CHAN(12, IIO_VOLTAGE, "USB_DP"), | |
625 | MXS_ADC_CHAN(13, IIO_VOLTAGE, "USB_DN"), | |
626 | MXS_ADC_CHAN(14, IIO_VOLTAGE, "VBG"), | |
627 | MXS_ADC_CHAN(15, IIO_VOLTAGE, "VDD5V"), | |
628 | }; | |
629 | ||
630 | static const struct iio_chan_spec mx28_lradc_chan_spec[] = { | |
631 | MXS_ADC_CHAN(0, IIO_VOLTAGE, "LRADC0"), | |
632 | MXS_ADC_CHAN(1, IIO_VOLTAGE, "LRADC1"), | |
633 | MXS_ADC_CHAN(2, IIO_VOLTAGE, "LRADC2"), | |
634 | MXS_ADC_CHAN(3, IIO_VOLTAGE, "LRADC3"), | |
635 | MXS_ADC_CHAN(4, IIO_VOLTAGE, "LRADC4"), | |
636 | MXS_ADC_CHAN(5, IIO_VOLTAGE, "LRADC5"), | |
637 | MXS_ADC_CHAN(6, IIO_VOLTAGE, "LRADC6"), | |
638 | MXS_ADC_CHAN(7, IIO_VOLTAGE, "VBATT"), | |
639 | /* Combined Temperature sensors */ | |
640 | { | |
641 | .type = IIO_TEMP, | |
642 | .indexed = 1, | |
643 | .scan_index = 8, | |
644 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | | |
645 | BIT(IIO_CHAN_INFO_OFFSET) | | |
646 | BIT(IIO_CHAN_INFO_SCALE), | |
647 | .channel = 8, | |
648 | .scan_type = {.sign = 'u', .realbits = 18, .storagebits = 32,}, | |
649 | .datasheet_name = "TEMP_DIE", | |
650 | }, | |
651 | /* Hidden channel to keep indexes */ | |
652 | { | |
653 | .type = IIO_TEMP, | |
654 | .indexed = 1, | |
655 | .scan_index = -1, | |
656 | .channel = 9, | |
657 | }, | |
658 | MXS_ADC_CHAN(10, IIO_VOLTAGE, "VDDIO"), | |
659 | MXS_ADC_CHAN(11, IIO_VOLTAGE, "VTH"), | |
660 | MXS_ADC_CHAN(12, IIO_VOLTAGE, "VDDA"), | |
661 | MXS_ADC_CHAN(13, IIO_VOLTAGE, "VDDD"), | |
662 | MXS_ADC_CHAN(14, IIO_VOLTAGE, "VBG"), | |
663 | MXS_ADC_CHAN(15, IIO_VOLTAGE, "VDD5V"), | |
664 | }; | |
665 | ||
666 | static void mxs_lradc_adc_hw_init(struct mxs_lradc_adc *adc) | |
667 | { | |
668 | /* The ADC always uses DELAY CHANNEL 0. */ | |
669 | const u32 adc_cfg = | |
670 | (1 << (LRADC_DELAY_TRIGGER_DELAYS_OFFSET + 0)) | | |
671 | (LRADC_DELAY_TIMER_PER << LRADC_DELAY_DELAY_OFFSET); | |
672 | ||
673 | /* Configure DELAY CHANNEL 0 for generic ADC sampling. */ | |
674 | writel(adc_cfg, adc->base + LRADC_DELAY(0)); | |
675 | ||
676 | /* | |
677 | * Start internal temperature sensing by clearing bit | |
678 | * HW_LRADC_CTRL2_TEMPSENSE_PWD. This bit can be left cleared | |
679 | * after power up. | |
680 | */ | |
681 | writel(0, adc->base + LRADC_CTRL2); | |
682 | } | |
683 | ||
684 | static void mxs_lradc_adc_hw_stop(struct mxs_lradc_adc *adc) | |
685 | { | |
686 | writel(0, adc->base + LRADC_DELAY(0)); | |
687 | } | |
688 | ||
689 | static int mxs_lradc_adc_probe(struct platform_device *pdev) | |
690 | { | |
691 | struct device *dev = &pdev->dev; | |
692 | struct mxs_lradc *lradc = dev_get_drvdata(dev->parent); | |
693 | struct mxs_lradc_adc *adc; | |
694 | struct iio_dev *iio; | |
695 | struct resource *iores; | |
696 | int ret, irq, virq, i, s, n; | |
697 | u64 scale_uv; | |
698 | const char **irq_name; | |
699 | ||
700 | /* Allocate the IIO device. */ | |
701 | iio = devm_iio_device_alloc(dev, sizeof(*adc)); | |
702 | if (!iio) { | |
703 | dev_err(dev, "Failed to allocate IIO device\n"); | |
704 | return -ENOMEM; | |
705 | } | |
706 | ||
707 | adc = iio_priv(iio); | |
708 | adc->lradc = lradc; | |
709 | adc->dev = dev; | |
710 | ||
711 | iores = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
1454e15b WY |
712 | if (!iores) |
713 | return -EINVAL; | |
714 | ||
6dd112b9 | 715 | adc->base = devm_ioremap(dev, iores->start, resource_size(iores)); |
1454e15b WY |
716 | if (!adc->base) |
717 | return -ENOMEM; | |
6dd112b9 KS |
718 | |
719 | init_completion(&adc->completion); | |
720 | spin_lock_init(&adc->lock); | |
721 | ||
722 | platform_set_drvdata(pdev, iio); | |
723 | ||
724 | iio->name = pdev->name; | |
725 | iio->dev.parent = dev; | |
726 | iio->dev.of_node = dev->parent->of_node; | |
727 | iio->info = &mxs_lradc_adc_iio_info; | |
728 | iio->modes = INDIO_DIRECT_MODE; | |
729 | iio->masklength = LRADC_MAX_TOTAL_CHANS; | |
730 | ||
731 | if (lradc->soc == IMX23_LRADC) { | |
732 | iio->channels = mx23_lradc_chan_spec; | |
733 | iio->num_channels = ARRAY_SIZE(mx23_lradc_chan_spec); | |
734 | irq_name = mx23_lradc_adc_irq_names; | |
735 | n = ARRAY_SIZE(mx23_lradc_adc_irq_names); | |
736 | } else { | |
737 | iio->channels = mx28_lradc_chan_spec; | |
738 | iio->num_channels = ARRAY_SIZE(mx28_lradc_chan_spec); | |
739 | irq_name = mx28_lradc_adc_irq_names; | |
740 | n = ARRAY_SIZE(mx28_lradc_adc_irq_names); | |
741 | } | |
742 | ||
743 | ret = stmp_reset_block(adc->base); | |
744 | if (ret) | |
745 | return ret; | |
746 | ||
747 | for (i = 0; i < n; i++) { | |
748 | irq = platform_get_irq_byname(pdev, irq_name[i]); | |
749 | if (irq < 0) | |
750 | return irq; | |
751 | ||
752 | virq = irq_of_parse_and_map(dev->parent->of_node, irq); | |
753 | ||
754 | ret = devm_request_irq(dev, virq, mxs_lradc_adc_handle_irq, | |
755 | 0, irq_name[i], iio); | |
756 | if (ret) | |
757 | return ret; | |
758 | } | |
759 | ||
760 | ret = mxs_lradc_adc_trigger_init(iio); | |
761 | if (ret) | |
762 | goto err_trig; | |
763 | ||
764 | ret = iio_triggered_buffer_setup(iio, &iio_pollfunc_store_time, | |
765 | &mxs_lradc_adc_trigger_handler, | |
766 | &mxs_lradc_adc_buffer_ops); | |
767 | if (ret) | |
768 | return ret; | |
769 | ||
770 | adc->vref_mv = mxs_lradc_adc_vref_mv[lradc->soc]; | |
771 | ||
772 | /* Populate available ADC input ranges */ | |
773 | for (i = 0; i < LRADC_MAX_TOTAL_CHANS; i++) { | |
774 | for (s = 0; s < ARRAY_SIZE(adc->scale_avail[i]); s++) { | |
775 | /* | |
776 | * [s=0] = optional divider by two disabled (default) | |
777 | * [s=1] = optional divider by two enabled | |
778 | * | |
779 | * The scale is calculated by doing: | |
780 | * Vref >> (realbits - s) | |
781 | * which multiplies by two on the second component | |
782 | * of the array. | |
783 | */ | |
784 | scale_uv = ((u64)adc->vref_mv[i] * 100000000) >> | |
785 | (LRADC_RESOLUTION - s); | |
786 | adc->scale_avail[i][s].nano = | |
787 | do_div(scale_uv, 100000000) * 10; | |
788 | adc->scale_avail[i][s].integer = scale_uv; | |
789 | } | |
790 | } | |
791 | ||
792 | /* Configure the hardware. */ | |
793 | mxs_lradc_adc_hw_init(adc); | |
794 | ||
795 | /* Register IIO device. */ | |
796 | ret = iio_device_register(iio); | |
797 | if (ret) { | |
798 | dev_err(dev, "Failed to register IIO device\n"); | |
799 | goto err_dev; | |
800 | } | |
801 | ||
802 | return 0; | |
803 | ||
804 | err_dev: | |
805 | mxs_lradc_adc_hw_stop(adc); | |
806 | mxs_lradc_adc_trigger_remove(iio); | |
807 | err_trig: | |
808 | iio_triggered_buffer_cleanup(iio); | |
809 | return ret; | |
810 | } | |
811 | ||
812 | static int mxs_lradc_adc_remove(struct platform_device *pdev) | |
813 | { | |
814 | struct iio_dev *iio = platform_get_drvdata(pdev); | |
815 | struct mxs_lradc_adc *adc = iio_priv(iio); | |
816 | ||
817 | iio_device_unregister(iio); | |
818 | mxs_lradc_adc_hw_stop(adc); | |
819 | mxs_lradc_adc_trigger_remove(iio); | |
820 | iio_triggered_buffer_cleanup(iio); | |
821 | ||
822 | return 0; | |
823 | } | |
824 | ||
825 | static struct platform_driver mxs_lradc_adc_driver = { | |
826 | .driver = { | |
827 | .name = "mxs-lradc-adc", | |
828 | }, | |
829 | .probe = mxs_lradc_adc_probe, | |
830 | .remove = mxs_lradc_adc_remove, | |
831 | }; | |
832 | module_platform_driver(mxs_lradc_adc_driver); | |
833 | ||
834 | MODULE_AUTHOR("Marek Vasut <marex@denx.de>"); | |
835 | MODULE_DESCRIPTION("Freescale MXS LRADC driver general purpose ADC driver"); | |
836 | MODULE_LICENSE("GPL"); | |
837 | MODULE_ALIAS("platform:mxs-lradc-adc"); |