1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Intel Lightning Mountain SoC LED Serial Shift Output Controller driver
4  *
5  * Copyright (c) 2020 Intel Corporation.
6  */
7 
8 #include <linux/bitfield.h>
9 #include <linux/clk.h>
10 #include <linux/gpio/consumer.h>
11 #include <linux/gpio/driver.h>
12 #include <linux/init.h>
13 #include <linux/kernel.h>
14 #include <linux/leds.h>
15 #include <linux/mfd/syscon.h>
16 #include <linux/module.h>
17 #include <linux/platform_device.h>
18 #include <linux/property.h>
19 #include <linux/regmap.h>
20 #include <linux/sizes.h>
21 #include <linux/uaccess.h>
22 
23 #define SSO_DEV_NAME			"lgm-sso"
24 
25 #define LED_BLINK_H8_0			0x0
26 #define LED_BLINK_H8_1			0x4
27 #define GET_FREQ_OFFSET(pin, src)	(((pin) * 6) + ((src) * 2))
28 #define GET_SRC_OFFSET(pinc)		(((pin) * 6) + 4)
29 
30 #define DUTY_CYCLE(x)			(0x8 + ((x) * 4))
31 #define SSO_CON0			0x2B0
32 #define SSO_CON0_RZFL			BIT(26)
33 #define SSO_CON0_BLINK_R		BIT(30)
34 #define SSO_CON0_SWU			BIT(31)
35 
36 #define SSO_CON1			0x2B4
37 #define SSO_CON1_FCDSC			GENMASK(21, 20) /* Fixed Divider Shift Clock */
38 #define SSO_CON1_FPID			GENMASK(24, 23)
39 #define SSO_CON1_GPTD			GENMASK(26, 25)
40 #define SSO_CON1_US			GENMASK(31, 30)
41 
42 #define SSO_CPU				0x2B8
43 #define SSO_CON2			0x2C4
44 #define SSO_CON3			0x2C8
45 
46 /* Driver MACRO */
47 #define MAX_PIN_NUM_PER_BANK		SZ_32
48 #define MAX_GROUP_NUM			SZ_4
49 #define PINS_PER_GROUP			SZ_8
50 #define FPID_FREQ_RANK_MAX		SZ_4
51 #define SSO_LED_MAX_NUM			SZ_32
52 #define MAX_FREQ_RANK			10
53 #define DEF_GPTC_CLK_RATE		200000000
54 #define SSO_DEF_BRIGHTNESS		LED_HALF
55 #define DATA_CLK_EDGE			0 /* 0-rising, 1-falling */
56 
57 static const u32 freq_div_tbl[] = {4000, 2000, 1000, 800};
58 static const int freq_tbl[] = {2, 4, 8, 10, 50000, 100000, 200000, 250000};
59 static const int shift_clk_freq_tbl[] = {25000000, 12500000, 6250000, 3125000};
60 
61 /*
62  * Update Source to update the SOUTs
63  * SW - Software has to update the SWU bit
64  * GPTC - General Purpose timer is used as clock source
65  * FPID - Divided FSC clock (FPID) is used as clock source
66  */
67 enum {
68 	US_SW = 0,
69 	US_GPTC = 1,
70 	US_FPID = 2
71 };
72 
73 enum {
74 	MAX_FPID_FREQ_RANK = 5, /* 1 to 4 */
75 	MAX_GPTC_FREQ_RANK = 9, /* 5 to 8 */
76 	MAX_GPTC_HS_FREQ_RANK = 10, /* 9 to 10 */
77 };
78 
79 enum {
80 	LED_GRP0_PIN_MAX = 24,
81 	LED_GRP1_PIN_MAX = 29,
82 	LED_GRP2_PIN_MAX = 32,
83 };
84 
85 enum {
86 	LED_GRP0_0_23,
87 	LED_GRP1_24_28,
88 	LED_GRP2_29_31,
89 	LED_GROUP_MAX,
90 };
91 
92 enum {
93 	CLK_SRC_FPID = 0,
94 	CLK_SRC_GPTC = 1,
95 	CLK_SRC_GPTC_HS = 2,
96 };
97 
98 struct sso_led_priv;
99 
100 struct sso_led_desc {
101 	const char *name;
102 	const char *default_trigger;
103 	unsigned int brightness;
104 	unsigned int blink_rate;
105 	unsigned int retain_state_suspended:1;
106 	unsigned int retain_state_shutdown:1;
107 	unsigned int panic_indicator:1;
108 	unsigned int hw_blink:1;
109 	unsigned int hw_trig:1;
110 	unsigned int blinking:1;
111 	int freq_idx;
112 	u32 pin;
113 };
114 
115 struct sso_led {
116 	struct list_head list;
117 	struct led_classdev cdev;
118 	struct gpio_desc *gpiod;
119 	struct sso_led_desc desc;
120 	struct sso_led_priv *priv;
121 };
122 
123 struct sso_gpio {
124 	struct gpio_chip chip;
125 	int shift_clk_freq;
126 	int edge;
127 	int freq;
128 	u32 pins;
129 	u32 alloc_bitmap;
130 };
131 
132 struct sso_led_priv {
133 	struct regmap *mmap;
134 	struct device *dev;
135 	struct platform_device *pdev;
136 	struct clk_bulk_data clocks[2];
137 	u32 fpid_clkrate;
138 	u32 gptc_clkrate;
139 	u32 freq[MAX_FREQ_RANK];
140 	struct list_head led_list;
141 	struct sso_gpio gpio;
142 };
143 
sso_get_blink_rate_idx(struct sso_led_priv * priv,u32 rate)144 static int sso_get_blink_rate_idx(struct sso_led_priv *priv, u32 rate)
145 {
146 	int i;
147 
148 	for (i = 0; i < MAX_FREQ_RANK; i++) {
149 		if (rate <= priv->freq[i])
150 			return i;
151 	}
152 
153 	return -1;
154 }
155 
sso_led_pin_to_group(u32 pin)156 static unsigned int sso_led_pin_to_group(u32 pin)
157 {
158 	if (pin < LED_GRP0_PIN_MAX)
159 		return LED_GRP0_0_23;
160 	else if (pin < LED_GRP1_PIN_MAX)
161 		return LED_GRP1_24_28;
162 	else
163 		return LED_GRP2_29_31;
164 }
165 
sso_led_get_freq_src(int freq_idx)166 static u32 sso_led_get_freq_src(int freq_idx)
167 {
168 	if (freq_idx < MAX_FPID_FREQ_RANK)
169 		return CLK_SRC_FPID;
170 	else if (freq_idx < MAX_GPTC_FREQ_RANK)
171 		return CLK_SRC_GPTC;
172 	else
173 		return CLK_SRC_GPTC_HS;
174 }
175 
sso_led_pin_blink_off(u32 pin,unsigned int group)176 static u32 sso_led_pin_blink_off(u32 pin, unsigned int group)
177 {
178 	if (group == LED_GRP2_29_31)
179 		return pin - LED_GRP1_PIN_MAX;
180 	else if (group == LED_GRP1_24_28)
181 		return pin - LED_GRP0_PIN_MAX;
182 	else	/* led 0 - 23 in led 32 location */
183 		return SSO_LED_MAX_NUM - LED_GRP1_PIN_MAX;
184 }
185 
186 static struct sso_led
cdev_to_sso_led_data(struct led_classdev * led_cdev)187 *cdev_to_sso_led_data(struct led_classdev *led_cdev)
188 {
189 	return container_of(led_cdev, struct sso_led, cdev);
190 }
191 
sso_led_freq_set(struct sso_led_priv * priv,u32 pin,int freq_idx)192 static void sso_led_freq_set(struct sso_led_priv *priv, u32 pin, int freq_idx)
193 {
194 	u32 reg, off, freq_src, val_freq;
195 	u32 low, high, val;
196 	unsigned int group;
197 
198 	if (!freq_idx)
199 		return;
200 
201 	group = sso_led_pin_to_group(pin);
202 	freq_src = sso_led_get_freq_src(freq_idx);
203 	off = sso_led_pin_blink_off(pin, group);
204 
205 	if (group == LED_GRP0_0_23)
206 		return;
207 	else if (group == LED_GRP1_24_28)
208 		reg = LED_BLINK_H8_0;
209 	else
210 		reg = LED_BLINK_H8_1;
211 
212 	if (freq_src == CLK_SRC_FPID)
213 		val_freq = freq_idx - 1;
214 	else if (freq_src == CLK_SRC_GPTC)
215 		val_freq = freq_idx - MAX_FPID_FREQ_RANK;
216 
217 	/* set blink rate idx */
218 	if (freq_src != CLK_SRC_GPTC_HS) {
219 		low = GET_FREQ_OFFSET(off, freq_src);
220 		high = low + 2;
221 		val = val_freq << high;
222 		regmap_update_bits(priv->mmap, reg, GENMASK(high, low), val);
223 	}
224 
225 	/* select clock source */
226 	low = GET_SRC_OFFSET(off);
227 	high = low + 2;
228 	val = freq_src << high;
229 	regmap_update_bits(priv->mmap, reg, GENMASK(high, low), val);
230 }
231 
sso_led_brightness_set(struct led_classdev * led_cdev,enum led_brightness brightness)232 static void sso_led_brightness_set(struct led_classdev *led_cdev,
233 				   enum led_brightness brightness)
234 {
235 	struct sso_led_priv *priv;
236 	struct sso_led_desc *desc;
237 	struct sso_led *led;
238 	int val;
239 
240 	led = cdev_to_sso_led_data(led_cdev);
241 	priv = led->priv;
242 	desc = &led->desc;
243 
244 	desc->brightness = brightness;
245 	regmap_write(priv->mmap, DUTY_CYCLE(desc->pin), brightness);
246 
247 	if (brightness == LED_OFF)
248 		val = 0;
249 	else
250 		val = 1;
251 
252 	/* HW blink off */
253 	if (desc->hw_blink && !val && desc->blinking) {
254 		desc->blinking = 0;
255 		regmap_update_bits(priv->mmap, SSO_CON2, BIT(desc->pin), 0);
256 	} else if (desc->hw_blink && val && !desc->blinking) {
257 		desc->blinking = 1;
258 		regmap_update_bits(priv->mmap, SSO_CON2, BIT(desc->pin),
259 				   1 << desc->pin);
260 	}
261 
262 	if (!desc->hw_trig)
263 		gpiod_set_value(led->gpiod, val);
264 }
265 
sso_led_brightness_get(struct led_classdev * led_cdev)266 static enum led_brightness sso_led_brightness_get(struct led_classdev *led_cdev)
267 {
268 	struct sso_led *led = cdev_to_sso_led_data(led_cdev);
269 
270 	return (enum led_brightness)led->desc.brightness;
271 }
272 
273 static int
delay_to_freq_idx(struct sso_led * led,unsigned long * delay_on,unsigned long * delay_off)274 delay_to_freq_idx(struct sso_led *led, unsigned long *delay_on,
275 		  unsigned long *delay_off)
276 {
277 	struct sso_led_priv *priv = led->priv;
278 	unsigned long delay;
279 	int freq_idx;
280 	u32 freq;
281 
282 	if (!*delay_on && !*delay_off) {
283 		*delay_on = *delay_off = (1000 / priv->freq[0]) / 2;
284 		return 0;
285 	}
286 
287 	delay = *delay_on + *delay_off;
288 	freq = 1000 / delay;
289 
290 	freq_idx = sso_get_blink_rate_idx(priv, freq);
291 	if (freq_idx == -1)
292 		freq_idx = MAX_FREQ_RANK - 1;
293 
294 	delay = 1000 / priv->freq[freq_idx];
295 	*delay_on = *delay_off = delay / 2;
296 
297 	if (!*delay_on)
298 		*delay_on = *delay_off = 1;
299 
300 	return freq_idx;
301 }
302 
303 static int
sso_led_blink_set(struct led_classdev * led_cdev,unsigned long * delay_on,unsigned long * delay_off)304 sso_led_blink_set(struct led_classdev *led_cdev, unsigned long *delay_on,
305 		  unsigned long *delay_off)
306 {
307 	struct sso_led_priv *priv;
308 	struct sso_led *led;
309 	int freq_idx;
310 
311 	led = cdev_to_sso_led_data(led_cdev);
312 	priv = led->priv;
313 	freq_idx = delay_to_freq_idx(led, delay_on, delay_off);
314 
315 	sso_led_freq_set(priv, led->desc.pin, freq_idx);
316 	regmap_update_bits(priv->mmap, SSO_CON2, BIT(led->desc.pin),
317 			   1 << led->desc.pin);
318 	led->desc.freq_idx = freq_idx;
319 	led->desc.blink_rate = priv->freq[freq_idx];
320 	led->desc.blinking = 1;
321 
322 	return 1;
323 }
324 
sso_led_hw_cfg(struct sso_led_priv * priv,struct sso_led * led)325 static void sso_led_hw_cfg(struct sso_led_priv *priv, struct sso_led *led)
326 {
327 	struct sso_led_desc *desc = &led->desc;
328 
329 	/* set freq */
330 	if (desc->hw_blink) {
331 		sso_led_freq_set(priv, desc->pin, desc->freq_idx);
332 		regmap_update_bits(priv->mmap, SSO_CON2, BIT(desc->pin),
333 				   1 << desc->pin);
334 	}
335 
336 	if (desc->hw_trig)
337 		regmap_update_bits(priv->mmap, SSO_CON3, BIT(desc->pin),
338 				   1 << desc->pin);
339 
340 	/* set brightness */
341 	regmap_write(priv->mmap, DUTY_CYCLE(desc->pin), desc->brightness);
342 
343 	/* enable output */
344 	if (!desc->hw_trig && desc->brightness)
345 		gpiod_set_value(led->gpiod, 1);
346 }
347 
sso_create_led(struct sso_led_priv * priv,struct sso_led * led,struct fwnode_handle * child)348 static int sso_create_led(struct sso_led_priv *priv, struct sso_led *led,
349 			  struct fwnode_handle *child)
350 {
351 	struct sso_led_desc *desc = &led->desc;
352 	struct led_init_data init_data;
353 	int err;
354 
355 	init_data.fwnode = child;
356 	init_data.devicename = SSO_DEV_NAME;
357 	init_data.default_label = ":";
358 
359 	led->cdev.default_trigger = desc->default_trigger;
360 	led->cdev.brightness_set = sso_led_brightness_set;
361 	led->cdev.brightness_get = sso_led_brightness_get;
362 	led->cdev.brightness = desc->brightness;
363 	led->cdev.max_brightness = LED_FULL;
364 
365 	if (desc->retain_state_shutdown)
366 		led->cdev.flags |= LED_RETAIN_AT_SHUTDOWN;
367 	if (desc->retain_state_suspended)
368 		led->cdev.flags |= LED_CORE_SUSPENDRESUME;
369 	if (desc->panic_indicator)
370 		led->cdev.flags |= LED_PANIC_INDICATOR;
371 
372 	if (desc->hw_blink)
373 		led->cdev.blink_set = sso_led_blink_set;
374 
375 	sso_led_hw_cfg(priv, led);
376 
377 	err = devm_led_classdev_register_ext(priv->dev, &led->cdev, &init_data);
378 	if (err)
379 		return err;
380 
381 	list_add(&led->list, &priv->led_list);
382 
383 	return 0;
384 }
385 
sso_init_freq(struct sso_led_priv * priv)386 static void sso_init_freq(struct sso_led_priv *priv)
387 {
388 	int i;
389 
390 	priv->freq[0] = 0;
391 	for (i = 1; i < MAX_FREQ_RANK; i++) {
392 		if (i < MAX_FPID_FREQ_RANK) {
393 			priv->freq[i] = priv->fpid_clkrate / freq_div_tbl[i - 1];
394 		} else if (i < MAX_GPTC_FREQ_RANK) {
395 			priv->freq[i] = priv->gptc_clkrate /
396 				freq_div_tbl[i - MAX_FPID_FREQ_RANK];
397 		} else if (i < MAX_GPTC_HS_FREQ_RANK) {
398 			priv->freq[i] = priv->gptc_clkrate;
399 		}
400 	}
401 }
402 
sso_gpio_request(struct gpio_chip * chip,unsigned int offset)403 static int sso_gpio_request(struct gpio_chip *chip, unsigned int offset)
404 {
405 	struct sso_led_priv *priv = gpiochip_get_data(chip);
406 
407 	if (priv->gpio.alloc_bitmap & BIT(offset))
408 		return -EINVAL;
409 
410 	priv->gpio.alloc_bitmap |= BIT(offset);
411 	regmap_write(priv->mmap, DUTY_CYCLE(offset), 0xFF);
412 
413 	return 0;
414 }
415 
sso_gpio_free(struct gpio_chip * chip,unsigned int offset)416 static void sso_gpio_free(struct gpio_chip *chip, unsigned int offset)
417 {
418 	struct sso_led_priv *priv = gpiochip_get_data(chip);
419 
420 	priv->gpio.alloc_bitmap &= ~BIT(offset);
421 	regmap_write(priv->mmap, DUTY_CYCLE(offset), 0x0);
422 }
423 
sso_gpio_get_dir(struct gpio_chip * chip,unsigned int offset)424 static int sso_gpio_get_dir(struct gpio_chip *chip, unsigned int offset)
425 {
426 	return GPIO_LINE_DIRECTION_OUT;
427 }
428 
429 static int
sso_gpio_dir_out(struct gpio_chip * chip,unsigned int offset,int value)430 sso_gpio_dir_out(struct gpio_chip *chip, unsigned int offset, int value)
431 {
432 	struct sso_led_priv *priv = gpiochip_get_data(chip);
433 	bool bit = !!value;
434 
435 	regmap_update_bits(priv->mmap, SSO_CPU, BIT(offset), bit << offset);
436 	if (!priv->gpio.freq)
437 		regmap_update_bits(priv->mmap, SSO_CON0, SSO_CON0_SWU,
438 				   SSO_CON0_SWU);
439 
440 	return 0;
441 }
442 
sso_gpio_get(struct gpio_chip * chip,unsigned int offset)443 static int sso_gpio_get(struct gpio_chip *chip, unsigned int offset)
444 {
445 	struct sso_led_priv *priv = gpiochip_get_data(chip);
446 	u32 reg_val;
447 
448 	regmap_read(priv->mmap, SSO_CPU, &reg_val);
449 
450 	return !!(reg_val & BIT(offset));
451 }
452 
sso_gpio_set(struct gpio_chip * chip,unsigned int offset,int value)453 static void sso_gpio_set(struct gpio_chip *chip, unsigned int offset, int value)
454 {
455 	struct sso_led_priv *priv = gpiochip_get_data(chip);
456 
457 	regmap_update_bits(priv->mmap, SSO_CPU, BIT(offset), value << offset);
458 	if (!priv->gpio.freq)
459 		regmap_update_bits(priv->mmap, SSO_CON0, SSO_CON0_SWU,
460 				   SSO_CON0_SWU);
461 }
462 
sso_gpio_gc_init(struct device * dev,struct sso_led_priv * priv)463 static int sso_gpio_gc_init(struct device *dev, struct sso_led_priv *priv)
464 {
465 	struct gpio_chip *gc = &priv->gpio.chip;
466 
467 	gc->request             = sso_gpio_request;
468 	gc->free                = sso_gpio_free;
469 	gc->get_direction       = sso_gpio_get_dir;
470 	gc->direction_output    = sso_gpio_dir_out;
471 	gc->get                 = sso_gpio_get;
472 	gc->set                 = sso_gpio_set;
473 
474 	gc->label               = "lgm-sso";
475 	gc->base                = -1;
476 	/* To exclude pins from control, use "gpio-reserved-ranges" */
477 	gc->ngpio               = priv->gpio.pins;
478 	gc->parent              = dev;
479 	gc->owner               = THIS_MODULE;
480 
481 	return devm_gpiochip_add_data(dev, gc, priv);
482 }
483 
sso_gpio_get_freq_idx(int freq)484 static int sso_gpio_get_freq_idx(int freq)
485 {
486 	int idx;
487 
488 	for (idx = 0; idx < ARRAY_SIZE(freq_tbl); idx++) {
489 		if (freq <= freq_tbl[idx])
490 			return idx;
491 	}
492 
493 	return -1;
494 }
495 
sso_register_shift_clk(struct sso_led_priv * priv)496 static void sso_register_shift_clk(struct sso_led_priv *priv)
497 {
498 	int idx, size = ARRAY_SIZE(shift_clk_freq_tbl);
499 	u32 val = 0;
500 
501 	for (idx = 0; idx < size; idx++) {
502 		if (shift_clk_freq_tbl[idx] <= priv->gpio.shift_clk_freq) {
503 			val = idx;
504 			break;
505 		}
506 	}
507 
508 	if (idx == size)
509 		dev_warn(priv->dev, "%s: Invalid freq %d\n",
510 			 __func__, priv->gpio.shift_clk_freq);
511 
512 	regmap_update_bits(priv->mmap, SSO_CON1, SSO_CON1_FCDSC,
513 			   FIELD_PREP(SSO_CON1_FCDSC, val));
514 }
515 
sso_gpio_freq_set(struct sso_led_priv * priv)516 static int sso_gpio_freq_set(struct sso_led_priv *priv)
517 {
518 	int freq_idx;
519 	u32 val;
520 
521 	freq_idx = sso_gpio_get_freq_idx(priv->gpio.freq);
522 	if (freq_idx == -1)
523 		freq_idx = ARRAY_SIZE(freq_tbl) - 1;
524 
525 	val = freq_idx % FPID_FREQ_RANK_MAX;
526 
527 	if (!priv->gpio.freq) {
528 		regmap_update_bits(priv->mmap, SSO_CON0, SSO_CON0_BLINK_R, 0);
529 		regmap_update_bits(priv->mmap, SSO_CON1, SSO_CON1_US,
530 				   FIELD_PREP(SSO_CON1_US, US_SW));
531 	} else if (freq_idx < FPID_FREQ_RANK_MAX) {
532 		regmap_update_bits(priv->mmap, SSO_CON0, SSO_CON0_BLINK_R,
533 				   SSO_CON0_BLINK_R);
534 		regmap_update_bits(priv->mmap, SSO_CON1, SSO_CON1_US,
535 				   FIELD_PREP(SSO_CON1_US, US_FPID));
536 		regmap_update_bits(priv->mmap, SSO_CON1, SSO_CON1_FPID,
537 				   FIELD_PREP(SSO_CON1_FPID, val));
538 	} else {
539 		regmap_update_bits(priv->mmap, SSO_CON0, SSO_CON0_BLINK_R,
540 				   SSO_CON0_BLINK_R);
541 		regmap_update_bits(priv->mmap, SSO_CON1, SSO_CON1_US,
542 				   FIELD_PREP(SSO_CON1_US, US_GPTC));
543 		regmap_update_bits(priv->mmap, SSO_CON1, SSO_CON1_GPTD,
544 				   FIELD_PREP(SSO_CON1_GPTD, val));
545 	}
546 
547 	return 0;
548 }
549 
sso_gpio_hw_init(struct sso_led_priv * priv)550 static int sso_gpio_hw_init(struct sso_led_priv *priv)
551 {
552 	u32 activate;
553 	int i, err;
554 
555 	/* Clear all duty cycles */
556 	for (i = 0; i < priv->gpio.pins; i++) {
557 		err = regmap_write(priv->mmap, DUTY_CYCLE(i), 0);
558 		if (err)
559 			return err;
560 	}
561 
562 	/* 4 groups for total 32 pins */
563 	for (i = 1; i <= MAX_GROUP_NUM; i++) {
564 		activate = !!(i * PINS_PER_GROUP <= priv->gpio.pins ||
565 			      priv->gpio.pins > (i - 1) * PINS_PER_GROUP);
566 		err = regmap_update_bits(priv->mmap, SSO_CON1, BIT(i - 1),
567 					 activate << (i - 1));
568 		if (err)
569 			return err;
570 	}
571 
572 	/* NO HW directly controlled pin by default */
573 	err = regmap_write(priv->mmap, SSO_CON3, 0);
574 	if (err)
575 		return err;
576 
577 	/* NO BLINK for all pins */
578 	err = regmap_write(priv->mmap, SSO_CON2, 0);
579 	if (err)
580 		return err;
581 
582 	/* OUTPUT 0 by default */
583 	err = regmap_write(priv->mmap, SSO_CPU, 0);
584 	if (err)
585 		return err;
586 
587 	/* update edge */
588 	err = regmap_update_bits(priv->mmap, SSO_CON0, SSO_CON0_RZFL,
589 				 FIELD_PREP(SSO_CON0_RZFL, priv->gpio.edge));
590 	if (err)
591 		return err;
592 
593 	/* Set GPIO update rate */
594 	sso_gpio_freq_set(priv);
595 
596 	/* Register shift clock */
597 	sso_register_shift_clk(priv);
598 
599 	return 0;
600 }
601 
sso_led_shutdown(struct sso_led * led)602 static void sso_led_shutdown(struct sso_led *led)
603 {
604 	struct sso_led_priv *priv = led->priv;
605 
606 	/* unregister led */
607 	devm_led_classdev_unregister(priv->dev, &led->cdev);
608 
609 	/* clear HW control bit */
610 	if (led->desc.hw_trig)
611 		regmap_update_bits(priv->mmap, SSO_CON3, BIT(led->desc.pin), 0);
612 
613 	led->priv = NULL;
614 }
615 
616 static int
__sso_led_dt_parse(struct sso_led_priv * priv,struct fwnode_handle * fw_ssoled)617 __sso_led_dt_parse(struct sso_led_priv *priv, struct fwnode_handle *fw_ssoled)
618 {
619 	struct fwnode_handle *fwnode_child;
620 	struct device *dev = priv->dev;
621 	struct sso_led_desc *desc;
622 	struct sso_led *led;
623 	const char *tmp;
624 	u32 prop;
625 	int ret;
626 
627 	fwnode_for_each_child_node(fw_ssoled, fwnode_child) {
628 		led = devm_kzalloc(dev, sizeof(*led), GFP_KERNEL);
629 		if (!led) {
630 			ret = -ENOMEM;
631 			goto __dt_err;
632 		}
633 
634 		INIT_LIST_HEAD(&led->list);
635 		led->priv = priv;
636 		desc = &led->desc;
637 
638 		led->gpiod = devm_fwnode_gpiod_get(dev, fwnode_child, NULL,
639 						   GPIOD_ASIS, NULL);
640 		if (IS_ERR(led->gpiod)) {
641 			ret = dev_err_probe(dev, PTR_ERR(led->gpiod), "led: get gpio fail!\n");
642 			goto __dt_err;
643 		}
644 
645 		fwnode_property_read_string(fwnode_child,
646 					    "linux,default-trigger",
647 					    &desc->default_trigger);
648 
649 		if (fwnode_property_present(fwnode_child,
650 					    "retain-state-suspended"))
651 			desc->retain_state_suspended = 1;
652 
653 		if (fwnode_property_present(fwnode_child,
654 					    "retain-state-shutdown"))
655 			desc->retain_state_shutdown = 1;
656 
657 		if (fwnode_property_present(fwnode_child, "panic-indicator"))
658 			desc->panic_indicator = 1;
659 
660 		ret = fwnode_property_read_u32(fwnode_child, "reg", &prop);
661 		if (ret)
662 			goto __dt_err;
663 		if (prop >= SSO_LED_MAX_NUM) {
664 			dev_err(dev, "invalid LED pin:%u\n", prop);
665 			ret = -EINVAL;
666 			goto __dt_err;
667 		}
668 		desc->pin = prop;
669 
670 		if (fwnode_property_present(fwnode_child, "intel,sso-hw-blink"))
671 			desc->hw_blink = 1;
672 
673 		desc->hw_trig = fwnode_property_read_bool(fwnode_child,
674 							  "intel,sso-hw-trigger");
675 		if (desc->hw_trig) {
676 			desc->default_trigger = NULL;
677 			desc->retain_state_shutdown = 0;
678 			desc->retain_state_suspended = 0;
679 			desc->panic_indicator = 0;
680 			desc->hw_blink = 0;
681 		}
682 
683 		if (fwnode_property_read_u32(fwnode_child,
684 					     "intel,sso-blink-rate-hz", &prop)) {
685 			/* default first freq rate */
686 			desc->freq_idx = 0;
687 			desc->blink_rate = priv->freq[desc->freq_idx];
688 		} else {
689 			desc->freq_idx = sso_get_blink_rate_idx(priv, prop);
690 			if (desc->freq_idx == -1)
691 				desc->freq_idx = MAX_FREQ_RANK - 1;
692 
693 			desc->blink_rate = priv->freq[desc->freq_idx];
694 		}
695 
696 		if (!fwnode_property_read_string(fwnode_child, "default-state", &tmp)) {
697 			if (!strcmp(tmp, "on"))
698 				desc->brightness = LED_FULL;
699 		}
700 
701 		ret = sso_create_led(priv, led, fwnode_child);
702 		if (ret)
703 			goto __dt_err;
704 	}
705 
706 	return 0;
707 
708 __dt_err:
709 	fwnode_handle_put(fwnode_child);
710 	/* unregister leds */
711 	list_for_each_entry(led, &priv->led_list, list)
712 		sso_led_shutdown(led);
713 
714 	return ret;
715 }
716 
sso_led_dt_parse(struct sso_led_priv * priv)717 static int sso_led_dt_parse(struct sso_led_priv *priv)
718 {
719 	struct fwnode_handle *fwnode = dev_fwnode(priv->dev);
720 	struct fwnode_handle *fw_ssoled;
721 	struct device *dev = priv->dev;
722 	int count;
723 	int ret;
724 
725 	count = device_get_child_node_count(dev);
726 	if (!count)
727 		return 0;
728 
729 	fw_ssoled = fwnode_get_named_child_node(fwnode, "ssoled");
730 	if (fw_ssoled) {
731 		ret = __sso_led_dt_parse(priv, fw_ssoled);
732 		fwnode_handle_put(fw_ssoled);
733 		if (ret)
734 			return ret;
735 	}
736 
737 	return 0;
738 }
739 
sso_probe_gpios(struct sso_led_priv * priv)740 static int sso_probe_gpios(struct sso_led_priv *priv)
741 {
742 	struct device *dev = priv->dev;
743 	int ret;
744 
745 	if (device_property_read_u32(dev, "ngpios", &priv->gpio.pins))
746 		priv->gpio.pins = MAX_PIN_NUM_PER_BANK;
747 
748 	if (priv->gpio.pins > MAX_PIN_NUM_PER_BANK)
749 		return -EINVAL;
750 
751 	if (device_property_read_u32(dev, "intel,sso-update-rate-hz",
752 				     &priv->gpio.freq))
753 		priv->gpio.freq = 0;
754 
755 	priv->gpio.edge = DATA_CLK_EDGE;
756 	priv->gpio.shift_clk_freq = -1;
757 
758 	ret = sso_gpio_hw_init(priv);
759 	if (ret)
760 		return ret;
761 
762 	return sso_gpio_gc_init(dev, priv);
763 }
764 
sso_clock_disable_unprepare(void * data)765 static void sso_clock_disable_unprepare(void *data)
766 {
767 	struct sso_led_priv *priv = data;
768 
769 	clk_bulk_disable_unprepare(ARRAY_SIZE(priv->clocks), priv->clocks);
770 }
771 
intel_sso_led_probe(struct platform_device * pdev)772 static int intel_sso_led_probe(struct platform_device *pdev)
773 {
774 	struct device *dev = &pdev->dev;
775 	struct sso_led_priv *priv;
776 	int ret;
777 
778 	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
779 	if (!priv)
780 		return -ENOMEM;
781 
782 	priv->pdev = pdev;
783 	priv->dev = dev;
784 
785 	/* gate clock */
786 	priv->clocks[0].id = "sso";
787 
788 	/* fpid clock */
789 	priv->clocks[1].id = "fpid";
790 
791 	ret = devm_clk_bulk_get(dev, ARRAY_SIZE(priv->clocks), priv->clocks);
792 	if (ret) {
793 		dev_err(dev, "Getting clocks failed!\n");
794 		return ret;
795 	}
796 
797 	ret = clk_bulk_prepare_enable(ARRAY_SIZE(priv->clocks), priv->clocks);
798 	if (ret) {
799 		dev_err(dev, "Failed to prepare and enable clocks!\n");
800 		return ret;
801 	}
802 
803 	ret = devm_add_action_or_reset(dev, sso_clock_disable_unprepare, priv);
804 	if (ret)
805 		return ret;
806 
807 	priv->fpid_clkrate = clk_get_rate(priv->clocks[1].clk);
808 
809 	priv->mmap = syscon_node_to_regmap(dev->of_node);
810 
811 	priv->mmap = syscon_node_to_regmap(dev->of_node);
812 	if (IS_ERR(priv->mmap)) {
813 		dev_err(dev, "Failed to map iomem!\n");
814 		return PTR_ERR(priv->mmap);
815 	}
816 
817 	ret = sso_probe_gpios(priv);
818 	if (ret) {
819 		regmap_exit(priv->mmap);
820 		return ret;
821 	}
822 
823 	INIT_LIST_HEAD(&priv->led_list);
824 
825 	platform_set_drvdata(pdev, priv);
826 	sso_init_freq(priv);
827 
828 	priv->gptc_clkrate = DEF_GPTC_CLK_RATE;
829 
830 	ret = sso_led_dt_parse(priv);
831 	if (ret) {
832 		regmap_exit(priv->mmap);
833 		return ret;
834 	}
835 	dev_info(priv->dev, "sso LED init success!\n");
836 
837 	return 0;
838 }
839 
intel_sso_led_remove(struct platform_device * pdev)840 static int intel_sso_led_remove(struct platform_device *pdev)
841 {
842 	struct sso_led_priv *priv;
843 	struct sso_led *led, *n;
844 
845 	priv = platform_get_drvdata(pdev);
846 
847 	list_for_each_entry_safe(led, n, &priv->led_list, list) {
848 		list_del(&led->list);
849 		sso_led_shutdown(led);
850 	}
851 
852 	regmap_exit(priv->mmap);
853 
854 	return 0;
855 }
856 
857 static const struct of_device_id of_sso_led_match[] = {
858 	{ .compatible = "intel,lgm-ssoled" },
859 	{}
860 };
861 
862 MODULE_DEVICE_TABLE(of, of_sso_led_match);
863 
864 static struct platform_driver intel_sso_led_driver = {
865 	.probe		= intel_sso_led_probe,
866 	.remove		= intel_sso_led_remove,
867 	.driver		= {
868 			.name = "lgm-ssoled",
869 			.of_match_table = of_sso_led_match,
870 	},
871 };
872 
873 module_platform_driver(intel_sso_led_driver);
874 
875 MODULE_DESCRIPTION("Intel SSO LED/GPIO driver");
876 MODULE_LICENSE("GPL v2");
877