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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
fd7b025a ÁFR |
2 | /* |
3 | * Driver for BCM6328 memory-mapped LEDs, based on leds-syscon.c | |
4 | * | |
5 | * Copyright 2015 Álvaro Fernández Rojas <noltari@gmail.com> | |
6 | * Copyright 2015 Jonas Gorski <jogo@openwrt.org> | |
fd7b025a ÁFR |
7 | */ |
8 | #include <linux/io.h> | |
9 | #include <linux/leds.h> | |
10 | #include <linux/module.h> | |
11 | #include <linux/of.h> | |
12 | #include <linux/platform_device.h> | |
13 | #include <linux/spinlock.h> | |
14 | ||
15 | #define BCM6328_REG_INIT 0x00 | |
16 | #define BCM6328_REG_MODE_HI 0x04 | |
17 | #define BCM6328_REG_MODE_LO 0x08 | |
18 | #define BCM6328_REG_HWDIS 0x0c | |
19 | #define BCM6328_REG_STROBE 0x10 | |
20 | #define BCM6328_REG_LNKACTSEL_HI 0x14 | |
21 | #define BCM6328_REG_LNKACTSEL_LO 0x18 | |
22 | #define BCM6328_REG_RBACK 0x1c | |
23 | #define BCM6328_REG_SERMUX 0x20 | |
24 | ||
25 | #define BCM6328_LED_MAX_COUNT 24 | |
26 | #define BCM6328_LED_DEF_DELAY 500 | |
27 | #define BCM6328_LED_INTERVAL_MS 20 | |
28 | ||
29 | #define BCM6328_LED_INTV_MASK 0x3f | |
30 | #define BCM6328_LED_FAST_INTV_SHIFT 6 | |
31 | #define BCM6328_LED_FAST_INTV_MASK (BCM6328_LED_INTV_MASK << \ | |
32 | BCM6328_LED_FAST_INTV_SHIFT) | |
33 | #define BCM6328_SERIAL_LED_EN BIT(12) | |
34 | #define BCM6328_SERIAL_LED_MUX BIT(13) | |
35 | #define BCM6328_SERIAL_LED_CLK_NPOL BIT(14) | |
36 | #define BCM6328_SERIAL_LED_DATA_PPOL BIT(15) | |
37 | #define BCM6328_SERIAL_LED_SHIFT_DIR BIT(16) | |
38 | #define BCM6328_LED_SHIFT_TEST BIT(30) | |
39 | #define BCM6328_LED_TEST BIT(31) | |
9f82c778 | 40 | #define BCM6328_INIT_MASK (BCM6328_SERIAL_LED_EN | \ |
41251e24 | 41 | BCM6328_SERIAL_LED_MUX | \ |
9f82c778 ÁFR |
42 | BCM6328_SERIAL_LED_CLK_NPOL | \ |
43 | BCM6328_SERIAL_LED_DATA_PPOL | \ | |
44 | BCM6328_SERIAL_LED_SHIFT_DIR) | |
fd7b025a ÁFR |
45 | |
46 | #define BCM6328_LED_MODE_MASK 3 | |
b964c5ba | 47 | #define BCM6328_LED_MODE_ON 0 |
fd7b025a ÁFR |
48 | #define BCM6328_LED_MODE_FAST 1 |
49 | #define BCM6328_LED_MODE_BLINK 2 | |
b964c5ba | 50 | #define BCM6328_LED_MODE_OFF 3 |
fd7b025a ÁFR |
51 | #define BCM6328_LED_SHIFT(X) ((X) << 1) |
52 | ||
53 | /** | |
54 | * struct bcm6328_led - state container for bcm6328 based LEDs | |
55 | * @cdev: LED class device for this LED | |
56 | * @mem: memory resource | |
57 | * @lock: memory lock | |
58 | * @pin: LED pin number | |
59 | * @blink_leds: blinking LEDs | |
60 | * @blink_delay: blinking delay | |
61 | * @active_low: LED is active low | |
62 | */ | |
63 | struct bcm6328_led { | |
64 | struct led_classdev cdev; | |
65 | void __iomem *mem; | |
66 | spinlock_t *lock; | |
67 | unsigned long pin; | |
68 | unsigned long *blink_leds; | |
69 | unsigned long *blink_delay; | |
70 | bool active_low; | |
71 | }; | |
72 | ||
73 | static void bcm6328_led_write(void __iomem *reg, unsigned long data) | |
74 | { | |
a06cd4b7 | 75 | #ifdef CONFIG_CPU_BIG_ENDIAN |
fd7b025a | 76 | iowrite32be(data, reg); |
a06cd4b7 ÁFR |
77 | #else |
78 | writel(data, reg); | |
79 | #endif | |
fd7b025a ÁFR |
80 | } |
81 | ||
82 | static unsigned long bcm6328_led_read(void __iomem *reg) | |
83 | { | |
a06cd4b7 | 84 | #ifdef CONFIG_CPU_BIG_ENDIAN |
fd7b025a | 85 | return ioread32be(reg); |
a06cd4b7 ÁFR |
86 | #else |
87 | return readl(reg); | |
88 | #endif | |
fd7b025a ÁFR |
89 | } |
90 | ||
91 | /** | |
92 | * LEDMode 64 bits / 24 LEDs | |
93 | * bits [31:0] -> LEDs 8-23 | |
94 | * bits [47:32] -> LEDs 0-7 | |
95 | * bits [63:48] -> unused | |
96 | */ | |
97 | static unsigned long bcm6328_pin2shift(unsigned long pin) | |
98 | { | |
99 | if (pin < 8) | |
100 | return pin + 16; /* LEDs 0-7 (bits 47:32) */ | |
101 | else | |
102 | return pin - 8; /* LEDs 8-23 (bits 31:0) */ | |
103 | } | |
104 | ||
105 | static void bcm6328_led_mode(struct bcm6328_led *led, unsigned long value) | |
106 | { | |
107 | void __iomem *mode; | |
108 | unsigned long val, shift; | |
109 | ||
110 | shift = bcm6328_pin2shift(led->pin); | |
111 | if (shift / 16) | |
112 | mode = led->mem + BCM6328_REG_MODE_HI; | |
113 | else | |
114 | mode = led->mem + BCM6328_REG_MODE_LO; | |
115 | ||
116 | val = bcm6328_led_read(mode); | |
117 | val &= ~(BCM6328_LED_MODE_MASK << BCM6328_LED_SHIFT(shift % 16)); | |
118 | val |= (value << BCM6328_LED_SHIFT(shift % 16)); | |
119 | bcm6328_led_write(mode, val); | |
120 | } | |
121 | ||
122 | static void bcm6328_led_set(struct led_classdev *led_cdev, | |
123 | enum led_brightness value) | |
124 | { | |
125 | struct bcm6328_led *led = | |
126 | container_of(led_cdev, struct bcm6328_led, cdev); | |
127 | unsigned long flags; | |
128 | ||
129 | spin_lock_irqsave(led->lock, flags); | |
130 | *(led->blink_leds) &= ~BIT(led->pin); | |
131 | if ((led->active_low && value == LED_OFF) || | |
132 | (!led->active_low && value != LED_OFF)) | |
fd7b025a | 133 | bcm6328_led_mode(led, BCM6328_LED_MODE_ON); |
b964c5ba SA |
134 | else |
135 | bcm6328_led_mode(led, BCM6328_LED_MODE_OFF); | |
fd7b025a ÁFR |
136 | spin_unlock_irqrestore(led->lock, flags); |
137 | } | |
138 | ||
1b85a5a5 ÁFR |
139 | static unsigned long bcm6328_blink_delay(unsigned long delay) |
140 | { | |
141 | unsigned long bcm6328_delay; | |
142 | ||
143 | bcm6328_delay = delay + BCM6328_LED_INTERVAL_MS / 2; | |
144 | bcm6328_delay = bcm6328_delay / BCM6328_LED_INTERVAL_MS; | |
145 | if (bcm6328_delay == 0) | |
146 | bcm6328_delay = 1; | |
147 | ||
148 | return bcm6328_delay; | |
149 | } | |
150 | ||
fd7b025a ÁFR |
151 | static int bcm6328_blink_set(struct led_classdev *led_cdev, |
152 | unsigned long *delay_on, unsigned long *delay_off) | |
153 | { | |
154 | struct bcm6328_led *led = | |
155 | container_of(led_cdev, struct bcm6328_led, cdev); | |
156 | unsigned long delay, flags; | |
143b77ce | 157 | int rc; |
fd7b025a ÁFR |
158 | |
159 | if (!*delay_on) | |
160 | *delay_on = BCM6328_LED_DEF_DELAY; | |
161 | if (!*delay_off) | |
162 | *delay_off = BCM6328_LED_DEF_DELAY; | |
163 | ||
1b85a5a5 ÁFR |
164 | delay = bcm6328_blink_delay(*delay_on); |
165 | if (delay != bcm6328_blink_delay(*delay_off)) { | |
fd7b025a ÁFR |
166 | dev_dbg(led_cdev->dev, |
167 | "fallback to soft blinking (delay_on != delay_off)\n"); | |
168 | return -EINVAL; | |
169 | } | |
170 | ||
1b85a5a5 | 171 | if (delay > BCM6328_LED_INTV_MASK) { |
fd7b025a ÁFR |
172 | dev_dbg(led_cdev->dev, |
173 | "fallback to soft blinking (delay > %ums)\n", | |
174 | BCM6328_LED_INTV_MASK * BCM6328_LED_INTERVAL_MS); | |
175 | return -EINVAL; | |
176 | } | |
177 | ||
178 | spin_lock_irqsave(led->lock, flags); | |
179 | if (*(led->blink_leds) == 0 || | |
180 | *(led->blink_leds) == BIT(led->pin) || | |
181 | *(led->blink_delay) == delay) { | |
182 | unsigned long val; | |
183 | ||
184 | *(led->blink_leds) |= BIT(led->pin); | |
185 | *(led->blink_delay) = delay; | |
186 | ||
187 | val = bcm6328_led_read(led->mem + BCM6328_REG_INIT); | |
188 | val &= ~BCM6328_LED_FAST_INTV_MASK; | |
189 | val |= (delay << BCM6328_LED_FAST_INTV_SHIFT); | |
190 | bcm6328_led_write(led->mem + BCM6328_REG_INIT, val); | |
191 | ||
192 | bcm6328_led_mode(led, BCM6328_LED_MODE_BLINK); | |
143b77ce | 193 | rc = 0; |
fd7b025a | 194 | } else { |
fd7b025a ÁFR |
195 | dev_dbg(led_cdev->dev, |
196 | "fallback to soft blinking (delay already set)\n"); | |
143b77ce | 197 | rc = -EINVAL; |
fd7b025a | 198 | } |
143b77ce | 199 | spin_unlock_irqrestore(led->lock, flags); |
fd7b025a | 200 | |
143b77ce | 201 | return rc; |
fd7b025a ÁFR |
202 | } |
203 | ||
204 | static int bcm6328_hwled(struct device *dev, struct device_node *nc, u32 reg, | |
205 | void __iomem *mem, spinlock_t *lock) | |
206 | { | |
207 | int i, cnt; | |
208 | unsigned long flags, val; | |
209 | ||
210 | spin_lock_irqsave(lock, flags); | |
211 | val = bcm6328_led_read(mem + BCM6328_REG_HWDIS); | |
212 | val &= ~BIT(reg); | |
213 | bcm6328_led_write(mem + BCM6328_REG_HWDIS, val); | |
214 | spin_unlock_irqrestore(lock, flags); | |
215 | ||
216 | /* Only LEDs 0-7 can be activity/link controlled */ | |
217 | if (reg >= 8) | |
218 | return 0; | |
219 | ||
220 | cnt = of_property_count_elems_of_size(nc, "brcm,link-signal-sources", | |
221 | sizeof(u32)); | |
222 | for (i = 0; i < cnt; i++) { | |
223 | u32 sel; | |
224 | void __iomem *addr; | |
225 | ||
226 | if (reg < 4) | |
227 | addr = mem + BCM6328_REG_LNKACTSEL_LO; | |
228 | else | |
229 | addr = mem + BCM6328_REG_LNKACTSEL_HI; | |
230 | ||
231 | of_property_read_u32_index(nc, "brcm,link-signal-sources", i, | |
232 | &sel); | |
233 | ||
234 | if (reg / 4 != sel / 4) { | |
235 | dev_warn(dev, "invalid link signal source\n"); | |
236 | continue; | |
237 | } | |
238 | ||
239 | spin_lock_irqsave(lock, flags); | |
240 | val = bcm6328_led_read(addr); | |
4f02b50e | 241 | val |= (BIT(reg % 4) << (((sel % 4) * 4) + 16)); |
fd7b025a ÁFR |
242 | bcm6328_led_write(addr, val); |
243 | spin_unlock_irqrestore(lock, flags); | |
244 | } | |
245 | ||
246 | cnt = of_property_count_elems_of_size(nc, | |
247 | "brcm,activity-signal-sources", | |
248 | sizeof(u32)); | |
249 | for (i = 0; i < cnt; i++) { | |
250 | u32 sel; | |
251 | void __iomem *addr; | |
252 | ||
253 | if (reg < 4) | |
254 | addr = mem + BCM6328_REG_LNKACTSEL_LO; | |
255 | else | |
256 | addr = mem + BCM6328_REG_LNKACTSEL_HI; | |
257 | ||
258 | of_property_read_u32_index(nc, "brcm,activity-signal-sources", | |
259 | i, &sel); | |
260 | ||
261 | if (reg / 4 != sel / 4) { | |
262 | dev_warn(dev, "invalid activity signal source\n"); | |
263 | continue; | |
264 | } | |
265 | ||
266 | spin_lock_irqsave(lock, flags); | |
267 | val = bcm6328_led_read(addr); | |
4f02b50e | 268 | val |= (BIT(reg % 4) << ((sel % 4) * 4)); |
fd7b025a ÁFR |
269 | bcm6328_led_write(addr, val); |
270 | spin_unlock_irqrestore(lock, flags); | |
271 | } | |
272 | ||
273 | return 0; | |
274 | } | |
275 | ||
276 | static int bcm6328_led(struct device *dev, struct device_node *nc, u32 reg, | |
277 | void __iomem *mem, spinlock_t *lock, | |
278 | unsigned long *blink_leds, unsigned long *blink_delay) | |
279 | { | |
280 | struct bcm6328_led *led; | |
fd7b025a ÁFR |
281 | const char *state; |
282 | int rc; | |
283 | ||
284 | led = devm_kzalloc(dev, sizeof(*led), GFP_KERNEL); | |
285 | if (!led) | |
286 | return -ENOMEM; | |
287 | ||
288 | led->pin = reg; | |
289 | led->mem = mem; | |
290 | led->lock = lock; | |
291 | led->blink_leds = blink_leds; | |
292 | led->blink_delay = blink_delay; | |
293 | ||
294 | if (of_property_read_bool(nc, "active-low")) | |
295 | led->active_low = true; | |
296 | ||
297 | led->cdev.name = of_get_property(nc, "label", NULL) ? : nc->name; | |
298 | led->cdev.default_trigger = of_get_property(nc, | |
299 | "linux,default-trigger", | |
300 | NULL); | |
301 | ||
302 | if (!of_property_read_string(nc, "default-state", &state)) { | |
fd7b025a ÁFR |
303 | if (!strcmp(state, "on")) { |
304 | led->cdev.brightness = LED_FULL; | |
fd7b025a ÁFR |
305 | } else if (!strcmp(state, "keep")) { |
306 | void __iomem *mode; | |
307 | unsigned long val, shift; | |
308 | ||
309 | shift = bcm6328_pin2shift(led->pin); | |
310 | if (shift / 16) | |
311 | mode = mem + BCM6328_REG_MODE_HI; | |
312 | else | |
313 | mode = mem + BCM6328_REG_MODE_LO; | |
314 | ||
d8fe1606 ÁFR |
315 | val = bcm6328_led_read(mode) >> |
316 | BCM6328_LED_SHIFT(shift % 16); | |
fd7b025a | 317 | val &= BCM6328_LED_MODE_MASK; |
b964c5ba SA |
318 | if ((led->active_low && val == BCM6328_LED_MODE_OFF) || |
319 | (!led->active_low && val == BCM6328_LED_MODE_ON)) | |
fd7b025a | 320 | led->cdev.brightness = LED_FULL; |
d8fe1606 | 321 | else |
fd7b025a | 322 | led->cdev.brightness = LED_OFF; |
fd7b025a ÁFR |
323 | } else { |
324 | led->cdev.brightness = LED_OFF; | |
fd7b025a | 325 | } |
d8fe1606 ÁFR |
326 | } else { |
327 | led->cdev.brightness = LED_OFF; | |
fd7b025a | 328 | } |
d8fe1606 | 329 | |
9d3c0663 SA |
330 | bcm6328_led_set(&led->cdev, led->cdev.brightness); |
331 | ||
fd7b025a ÁFR |
332 | led->cdev.brightness_set = bcm6328_led_set; |
333 | led->cdev.blink_set = bcm6328_blink_set; | |
334 | ||
335 | rc = led_classdev_register(dev, &led->cdev); | |
336 | if (rc < 0) | |
337 | return rc; | |
338 | ||
339 | dev_dbg(dev, "registered LED %s\n", led->cdev.name); | |
340 | ||
341 | return 0; | |
342 | } | |
343 | ||
344 | static int bcm6328_leds_probe(struct platform_device *pdev) | |
345 | { | |
346 | struct device *dev = &pdev->dev; | |
347 | struct device_node *np = pdev->dev.of_node; | |
348 | struct device_node *child; | |
fd7b025a | 349 | void __iomem *mem; |
41251e24 | 350 | spinlock_t *lock; /* memory lock */ |
fd7b025a ÁFR |
351 | unsigned long val, *blink_leds, *blink_delay; |
352 | ||
be9f18ee | 353 | mem = devm_platform_ioremap_resource(pdev, 0); |
fd7b025a ÁFR |
354 | if (IS_ERR(mem)) |
355 | return PTR_ERR(mem); | |
356 | ||
357 | lock = devm_kzalloc(dev, sizeof(*lock), GFP_KERNEL); | |
358 | if (!lock) | |
359 | return -ENOMEM; | |
360 | ||
361 | blink_leds = devm_kzalloc(dev, sizeof(*blink_leds), GFP_KERNEL); | |
362 | if (!blink_leds) | |
363 | return -ENOMEM; | |
364 | ||
365 | blink_delay = devm_kzalloc(dev, sizeof(*blink_delay), GFP_KERNEL); | |
366 | if (!blink_delay) | |
367 | return -ENOMEM; | |
368 | ||
369 | spin_lock_init(lock); | |
370 | ||
371 | bcm6328_led_write(mem + BCM6328_REG_HWDIS, ~0); | |
372 | bcm6328_led_write(mem + BCM6328_REG_LNKACTSEL_HI, 0); | |
373 | bcm6328_led_write(mem + BCM6328_REG_LNKACTSEL_LO, 0); | |
374 | ||
375 | val = bcm6328_led_read(mem + BCM6328_REG_INIT); | |
9f82c778 | 376 | val &= ~(BCM6328_INIT_MASK); |
fd7b025a ÁFR |
377 | if (of_property_read_bool(np, "brcm,serial-leds")) |
378 | val |= BCM6328_SERIAL_LED_EN; | |
9f82c778 ÁFR |
379 | if (of_property_read_bool(np, "brcm,serial-mux")) |
380 | val |= BCM6328_SERIAL_LED_MUX; | |
381 | if (of_property_read_bool(np, "brcm,serial-clk-low")) | |
382 | val |= BCM6328_SERIAL_LED_CLK_NPOL; | |
383 | if (!of_property_read_bool(np, "brcm,serial-dat-low")) | |
384 | val |= BCM6328_SERIAL_LED_DATA_PPOL; | |
385 | if (!of_property_read_bool(np, "brcm,serial-shift-inv")) | |
386 | val |= BCM6328_SERIAL_LED_SHIFT_DIR; | |
fd7b025a ÁFR |
387 | bcm6328_led_write(mem + BCM6328_REG_INIT, val); |
388 | ||
389 | for_each_available_child_of_node(np, child) { | |
390 | int rc; | |
391 | u32 reg; | |
392 | ||
393 | if (of_property_read_u32(child, "reg", ®)) | |
394 | continue; | |
395 | ||
396 | if (reg >= BCM6328_LED_MAX_COUNT) { | |
79653fbb | 397 | dev_err(dev, "invalid LED (%u >= %d)\n", reg, |
fd7b025a ÁFR |
398 | BCM6328_LED_MAX_COUNT); |
399 | continue; | |
400 | } | |
401 | ||
402 | if (of_property_read_bool(child, "brcm,hardware-controlled")) | |
403 | rc = bcm6328_hwled(dev, child, reg, mem, lock); | |
404 | else | |
405 | rc = bcm6328_led(dev, child, reg, mem, lock, | |
406 | blink_leds, blink_delay); | |
407 | ||
6cc76244 JL |
408 | if (rc < 0) { |
409 | of_node_put(child); | |
fd7b025a | 410 | return rc; |
6cc76244 | 411 | } |
fd7b025a ÁFR |
412 | } |
413 | ||
414 | return 0; | |
415 | } | |
416 | ||
417 | static const struct of_device_id bcm6328_leds_of_match[] = { | |
418 | { .compatible = "brcm,bcm6328-leds", }, | |
419 | { }, | |
420 | }; | |
6528ca19 | 421 | MODULE_DEVICE_TABLE(of, bcm6328_leds_of_match); |
fd7b025a ÁFR |
422 | |
423 | static struct platform_driver bcm6328_leds_driver = { | |
424 | .probe = bcm6328_leds_probe, | |
425 | .driver = { | |
426 | .name = "leds-bcm6328", | |
427 | .of_match_table = bcm6328_leds_of_match, | |
428 | }, | |
429 | }; | |
430 | ||
431 | module_platform_driver(bcm6328_leds_driver); | |
432 | ||
433 | MODULE_AUTHOR("Álvaro Fernández Rojas <noltari@gmail.com>"); | |
434 | MODULE_AUTHOR("Jonas Gorski <jogo@openwrt.org>"); | |
435 | MODULE_DESCRIPTION("LED driver for BCM6328 controllers"); | |
436 | MODULE_LICENSE("GPL v2"); | |
437 | MODULE_ALIAS("platform:leds-bcm6328"); |