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fd7b025a ÁFR |
1 | /* |
2 | * Driver for BCM6328 memory-mapped LEDs, based on leds-syscon.c | |
3 | * | |
4 | * Copyright 2015 Álvaro Fernández Rojas <noltari@gmail.com> | |
5 | * Copyright 2015 Jonas Gorski <jogo@openwrt.org> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify it | |
8 | * under the terms of the GNU General Public License as published by the | |
9 | * Free Software Foundation; either version 2 of the License, or (at your | |
10 | * option) any later version. | |
11 | */ | |
12 | #include <linux/io.h> | |
13 | #include <linux/leds.h> | |
14 | #include <linux/module.h> | |
15 | #include <linux/of.h> | |
16 | #include <linux/platform_device.h> | |
17 | #include <linux/spinlock.h> | |
18 | ||
19 | #define BCM6328_REG_INIT 0x00 | |
20 | #define BCM6328_REG_MODE_HI 0x04 | |
21 | #define BCM6328_REG_MODE_LO 0x08 | |
22 | #define BCM6328_REG_HWDIS 0x0c | |
23 | #define BCM6328_REG_STROBE 0x10 | |
24 | #define BCM6328_REG_LNKACTSEL_HI 0x14 | |
25 | #define BCM6328_REG_LNKACTSEL_LO 0x18 | |
26 | #define BCM6328_REG_RBACK 0x1c | |
27 | #define BCM6328_REG_SERMUX 0x20 | |
28 | ||
29 | #define BCM6328_LED_MAX_COUNT 24 | |
30 | #define BCM6328_LED_DEF_DELAY 500 | |
31 | #define BCM6328_LED_INTERVAL_MS 20 | |
32 | ||
33 | #define BCM6328_LED_INTV_MASK 0x3f | |
34 | #define BCM6328_LED_FAST_INTV_SHIFT 6 | |
35 | #define BCM6328_LED_FAST_INTV_MASK (BCM6328_LED_INTV_MASK << \ | |
36 | BCM6328_LED_FAST_INTV_SHIFT) | |
37 | #define BCM6328_SERIAL_LED_EN BIT(12) | |
38 | #define BCM6328_SERIAL_LED_MUX BIT(13) | |
39 | #define BCM6328_SERIAL_LED_CLK_NPOL BIT(14) | |
40 | #define BCM6328_SERIAL_LED_DATA_PPOL BIT(15) | |
41 | #define BCM6328_SERIAL_LED_SHIFT_DIR BIT(16) | |
42 | #define BCM6328_LED_SHIFT_TEST BIT(30) | |
43 | #define BCM6328_LED_TEST BIT(31) | |
9f82c778 | 44 | #define BCM6328_INIT_MASK (BCM6328_SERIAL_LED_EN | \ |
41251e24 | 45 | BCM6328_SERIAL_LED_MUX | \ |
9f82c778 ÁFR |
46 | BCM6328_SERIAL_LED_CLK_NPOL | \ |
47 | BCM6328_SERIAL_LED_DATA_PPOL | \ | |
48 | BCM6328_SERIAL_LED_SHIFT_DIR) | |
fd7b025a ÁFR |
49 | |
50 | #define BCM6328_LED_MODE_MASK 3 | |
b964c5ba | 51 | #define BCM6328_LED_MODE_ON 0 |
fd7b025a ÁFR |
52 | #define BCM6328_LED_MODE_FAST 1 |
53 | #define BCM6328_LED_MODE_BLINK 2 | |
b964c5ba | 54 | #define BCM6328_LED_MODE_OFF 3 |
fd7b025a ÁFR |
55 | #define BCM6328_LED_SHIFT(X) ((X) << 1) |
56 | ||
57 | /** | |
58 | * struct bcm6328_led - state container for bcm6328 based LEDs | |
59 | * @cdev: LED class device for this LED | |
60 | * @mem: memory resource | |
61 | * @lock: memory lock | |
62 | * @pin: LED pin number | |
63 | * @blink_leds: blinking LEDs | |
64 | * @blink_delay: blinking delay | |
65 | * @active_low: LED is active low | |
66 | */ | |
67 | struct bcm6328_led { | |
68 | struct led_classdev cdev; | |
69 | void __iomem *mem; | |
70 | spinlock_t *lock; | |
71 | unsigned long pin; | |
72 | unsigned long *blink_leds; | |
73 | unsigned long *blink_delay; | |
74 | bool active_low; | |
75 | }; | |
76 | ||
77 | static void bcm6328_led_write(void __iomem *reg, unsigned long data) | |
78 | { | |
a06cd4b7 | 79 | #ifdef CONFIG_CPU_BIG_ENDIAN |
fd7b025a | 80 | iowrite32be(data, reg); |
a06cd4b7 ÁFR |
81 | #else |
82 | writel(data, reg); | |
83 | #endif | |
fd7b025a ÁFR |
84 | } |
85 | ||
86 | static unsigned long bcm6328_led_read(void __iomem *reg) | |
87 | { | |
a06cd4b7 | 88 | #ifdef CONFIG_CPU_BIG_ENDIAN |
fd7b025a | 89 | return ioread32be(reg); |
a06cd4b7 ÁFR |
90 | #else |
91 | return readl(reg); | |
92 | #endif | |
fd7b025a ÁFR |
93 | } |
94 | ||
95 | /** | |
96 | * LEDMode 64 bits / 24 LEDs | |
97 | * bits [31:0] -> LEDs 8-23 | |
98 | * bits [47:32] -> LEDs 0-7 | |
99 | * bits [63:48] -> unused | |
100 | */ | |
101 | static unsigned long bcm6328_pin2shift(unsigned long pin) | |
102 | { | |
103 | if (pin < 8) | |
104 | return pin + 16; /* LEDs 0-7 (bits 47:32) */ | |
105 | else | |
106 | return pin - 8; /* LEDs 8-23 (bits 31:0) */ | |
107 | } | |
108 | ||
109 | static void bcm6328_led_mode(struct bcm6328_led *led, unsigned long value) | |
110 | { | |
111 | void __iomem *mode; | |
112 | unsigned long val, shift; | |
113 | ||
114 | shift = bcm6328_pin2shift(led->pin); | |
115 | if (shift / 16) | |
116 | mode = led->mem + BCM6328_REG_MODE_HI; | |
117 | else | |
118 | mode = led->mem + BCM6328_REG_MODE_LO; | |
119 | ||
120 | val = bcm6328_led_read(mode); | |
121 | val &= ~(BCM6328_LED_MODE_MASK << BCM6328_LED_SHIFT(shift % 16)); | |
122 | val |= (value << BCM6328_LED_SHIFT(shift % 16)); | |
123 | bcm6328_led_write(mode, val); | |
124 | } | |
125 | ||
126 | static void bcm6328_led_set(struct led_classdev *led_cdev, | |
127 | enum led_brightness value) | |
128 | { | |
129 | struct bcm6328_led *led = | |
130 | container_of(led_cdev, struct bcm6328_led, cdev); | |
131 | unsigned long flags; | |
132 | ||
133 | spin_lock_irqsave(led->lock, flags); | |
134 | *(led->blink_leds) &= ~BIT(led->pin); | |
135 | if ((led->active_low && value == LED_OFF) || | |
136 | (!led->active_low && value != LED_OFF)) | |
fd7b025a | 137 | bcm6328_led_mode(led, BCM6328_LED_MODE_ON); |
b964c5ba SA |
138 | else |
139 | bcm6328_led_mode(led, BCM6328_LED_MODE_OFF); | |
fd7b025a ÁFR |
140 | spin_unlock_irqrestore(led->lock, flags); |
141 | } | |
142 | ||
1b85a5a5 ÁFR |
143 | static unsigned long bcm6328_blink_delay(unsigned long delay) |
144 | { | |
145 | unsigned long bcm6328_delay; | |
146 | ||
147 | bcm6328_delay = delay + BCM6328_LED_INTERVAL_MS / 2; | |
148 | bcm6328_delay = bcm6328_delay / BCM6328_LED_INTERVAL_MS; | |
149 | if (bcm6328_delay == 0) | |
150 | bcm6328_delay = 1; | |
151 | ||
152 | return bcm6328_delay; | |
153 | } | |
154 | ||
fd7b025a ÁFR |
155 | static int bcm6328_blink_set(struct led_classdev *led_cdev, |
156 | unsigned long *delay_on, unsigned long *delay_off) | |
157 | { | |
158 | struct bcm6328_led *led = | |
159 | container_of(led_cdev, struct bcm6328_led, cdev); | |
160 | unsigned long delay, flags; | |
143b77ce | 161 | int rc; |
fd7b025a ÁFR |
162 | |
163 | if (!*delay_on) | |
164 | *delay_on = BCM6328_LED_DEF_DELAY; | |
165 | if (!*delay_off) | |
166 | *delay_off = BCM6328_LED_DEF_DELAY; | |
167 | ||
1b85a5a5 ÁFR |
168 | delay = bcm6328_blink_delay(*delay_on); |
169 | if (delay != bcm6328_blink_delay(*delay_off)) { | |
fd7b025a ÁFR |
170 | dev_dbg(led_cdev->dev, |
171 | "fallback to soft blinking (delay_on != delay_off)\n"); | |
172 | return -EINVAL; | |
173 | } | |
174 | ||
1b85a5a5 | 175 | if (delay > BCM6328_LED_INTV_MASK) { |
fd7b025a ÁFR |
176 | dev_dbg(led_cdev->dev, |
177 | "fallback to soft blinking (delay > %ums)\n", | |
178 | BCM6328_LED_INTV_MASK * BCM6328_LED_INTERVAL_MS); | |
179 | return -EINVAL; | |
180 | } | |
181 | ||
182 | spin_lock_irqsave(led->lock, flags); | |
183 | if (*(led->blink_leds) == 0 || | |
184 | *(led->blink_leds) == BIT(led->pin) || | |
185 | *(led->blink_delay) == delay) { | |
186 | unsigned long val; | |
187 | ||
188 | *(led->blink_leds) |= BIT(led->pin); | |
189 | *(led->blink_delay) = delay; | |
190 | ||
191 | val = bcm6328_led_read(led->mem + BCM6328_REG_INIT); | |
192 | val &= ~BCM6328_LED_FAST_INTV_MASK; | |
193 | val |= (delay << BCM6328_LED_FAST_INTV_SHIFT); | |
194 | bcm6328_led_write(led->mem + BCM6328_REG_INIT, val); | |
195 | ||
196 | bcm6328_led_mode(led, BCM6328_LED_MODE_BLINK); | |
143b77ce | 197 | rc = 0; |
fd7b025a | 198 | } else { |
fd7b025a ÁFR |
199 | dev_dbg(led_cdev->dev, |
200 | "fallback to soft blinking (delay already set)\n"); | |
143b77ce | 201 | rc = -EINVAL; |
fd7b025a | 202 | } |
143b77ce | 203 | spin_unlock_irqrestore(led->lock, flags); |
fd7b025a | 204 | |
143b77ce | 205 | return rc; |
fd7b025a ÁFR |
206 | } |
207 | ||
208 | static int bcm6328_hwled(struct device *dev, struct device_node *nc, u32 reg, | |
209 | void __iomem *mem, spinlock_t *lock) | |
210 | { | |
211 | int i, cnt; | |
212 | unsigned long flags, val; | |
213 | ||
214 | spin_lock_irqsave(lock, flags); | |
215 | val = bcm6328_led_read(mem + BCM6328_REG_HWDIS); | |
216 | val &= ~BIT(reg); | |
217 | bcm6328_led_write(mem + BCM6328_REG_HWDIS, val); | |
218 | spin_unlock_irqrestore(lock, flags); | |
219 | ||
220 | /* Only LEDs 0-7 can be activity/link controlled */ | |
221 | if (reg >= 8) | |
222 | return 0; | |
223 | ||
224 | cnt = of_property_count_elems_of_size(nc, "brcm,link-signal-sources", | |
225 | sizeof(u32)); | |
226 | for (i = 0; i < cnt; i++) { | |
227 | u32 sel; | |
228 | void __iomem *addr; | |
229 | ||
230 | if (reg < 4) | |
231 | addr = mem + BCM6328_REG_LNKACTSEL_LO; | |
232 | else | |
233 | addr = mem + BCM6328_REG_LNKACTSEL_HI; | |
234 | ||
235 | of_property_read_u32_index(nc, "brcm,link-signal-sources", i, | |
236 | &sel); | |
237 | ||
238 | if (reg / 4 != sel / 4) { | |
239 | dev_warn(dev, "invalid link signal source\n"); | |
240 | continue; | |
241 | } | |
242 | ||
243 | spin_lock_irqsave(lock, flags); | |
244 | val = bcm6328_led_read(addr); | |
245 | val |= (BIT(reg) << (((sel % 4) * 4) + 16)); | |
246 | bcm6328_led_write(addr, val); | |
247 | spin_unlock_irqrestore(lock, flags); | |
248 | } | |
249 | ||
250 | cnt = of_property_count_elems_of_size(nc, | |
251 | "brcm,activity-signal-sources", | |
252 | sizeof(u32)); | |
253 | for (i = 0; i < cnt; i++) { | |
254 | u32 sel; | |
255 | void __iomem *addr; | |
256 | ||
257 | if (reg < 4) | |
258 | addr = mem + BCM6328_REG_LNKACTSEL_LO; | |
259 | else | |
260 | addr = mem + BCM6328_REG_LNKACTSEL_HI; | |
261 | ||
262 | of_property_read_u32_index(nc, "brcm,activity-signal-sources", | |
263 | i, &sel); | |
264 | ||
265 | if (reg / 4 != sel / 4) { | |
266 | dev_warn(dev, "invalid activity signal source\n"); | |
267 | continue; | |
268 | } | |
269 | ||
270 | spin_lock_irqsave(lock, flags); | |
271 | val = bcm6328_led_read(addr); | |
272 | val |= (BIT(reg) << ((sel % 4) * 4)); | |
273 | bcm6328_led_write(addr, val); | |
274 | spin_unlock_irqrestore(lock, flags); | |
275 | } | |
276 | ||
277 | return 0; | |
278 | } | |
279 | ||
280 | static int bcm6328_led(struct device *dev, struct device_node *nc, u32 reg, | |
281 | void __iomem *mem, spinlock_t *lock, | |
282 | unsigned long *blink_leds, unsigned long *blink_delay) | |
283 | { | |
284 | struct bcm6328_led *led; | |
fd7b025a ÁFR |
285 | const char *state; |
286 | int rc; | |
287 | ||
288 | led = devm_kzalloc(dev, sizeof(*led), GFP_KERNEL); | |
289 | if (!led) | |
290 | return -ENOMEM; | |
291 | ||
292 | led->pin = reg; | |
293 | led->mem = mem; | |
294 | led->lock = lock; | |
295 | led->blink_leds = blink_leds; | |
296 | led->blink_delay = blink_delay; | |
297 | ||
298 | if (of_property_read_bool(nc, "active-low")) | |
299 | led->active_low = true; | |
300 | ||
301 | led->cdev.name = of_get_property(nc, "label", NULL) ? : nc->name; | |
302 | led->cdev.default_trigger = of_get_property(nc, | |
303 | "linux,default-trigger", | |
304 | NULL); | |
305 | ||
306 | if (!of_property_read_string(nc, "default-state", &state)) { | |
fd7b025a ÁFR |
307 | if (!strcmp(state, "on")) { |
308 | led->cdev.brightness = LED_FULL; | |
fd7b025a ÁFR |
309 | } else if (!strcmp(state, "keep")) { |
310 | void __iomem *mode; | |
311 | unsigned long val, shift; | |
312 | ||
313 | shift = bcm6328_pin2shift(led->pin); | |
314 | if (shift / 16) | |
315 | mode = mem + BCM6328_REG_MODE_HI; | |
316 | else | |
317 | mode = mem + BCM6328_REG_MODE_LO; | |
318 | ||
d8fe1606 ÁFR |
319 | val = bcm6328_led_read(mode) >> |
320 | BCM6328_LED_SHIFT(shift % 16); | |
fd7b025a | 321 | val &= BCM6328_LED_MODE_MASK; |
b964c5ba SA |
322 | if ((led->active_low && val == BCM6328_LED_MODE_OFF) || |
323 | (!led->active_low && val == BCM6328_LED_MODE_ON)) | |
fd7b025a | 324 | led->cdev.brightness = LED_FULL; |
d8fe1606 | 325 | else |
fd7b025a | 326 | led->cdev.brightness = LED_OFF; |
fd7b025a ÁFR |
327 | } else { |
328 | led->cdev.brightness = LED_OFF; | |
fd7b025a | 329 | } |
d8fe1606 ÁFR |
330 | } else { |
331 | led->cdev.brightness = LED_OFF; | |
fd7b025a | 332 | } |
d8fe1606 | 333 | |
9d3c0663 SA |
334 | bcm6328_led_set(&led->cdev, led->cdev.brightness); |
335 | ||
fd7b025a ÁFR |
336 | led->cdev.brightness_set = bcm6328_led_set; |
337 | led->cdev.blink_set = bcm6328_blink_set; | |
338 | ||
339 | rc = led_classdev_register(dev, &led->cdev); | |
340 | if (rc < 0) | |
341 | return rc; | |
342 | ||
343 | dev_dbg(dev, "registered LED %s\n", led->cdev.name); | |
344 | ||
345 | return 0; | |
346 | } | |
347 | ||
348 | static int bcm6328_leds_probe(struct platform_device *pdev) | |
349 | { | |
350 | struct device *dev = &pdev->dev; | |
351 | struct device_node *np = pdev->dev.of_node; | |
352 | struct device_node *child; | |
353 | struct resource *mem_r; | |
354 | void __iomem *mem; | |
41251e24 | 355 | spinlock_t *lock; /* memory lock */ |
fd7b025a ÁFR |
356 | unsigned long val, *blink_leds, *blink_delay; |
357 | ||
358 | mem_r = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
359 | if (!mem_r) | |
360 | return -EINVAL; | |
361 | ||
362 | mem = devm_ioremap_resource(dev, mem_r); | |
363 | if (IS_ERR(mem)) | |
364 | return PTR_ERR(mem); | |
365 | ||
366 | lock = devm_kzalloc(dev, sizeof(*lock), GFP_KERNEL); | |
367 | if (!lock) | |
368 | return -ENOMEM; | |
369 | ||
370 | blink_leds = devm_kzalloc(dev, sizeof(*blink_leds), GFP_KERNEL); | |
371 | if (!blink_leds) | |
372 | return -ENOMEM; | |
373 | ||
374 | blink_delay = devm_kzalloc(dev, sizeof(*blink_delay), GFP_KERNEL); | |
375 | if (!blink_delay) | |
376 | return -ENOMEM; | |
377 | ||
378 | spin_lock_init(lock); | |
379 | ||
380 | bcm6328_led_write(mem + BCM6328_REG_HWDIS, ~0); | |
381 | bcm6328_led_write(mem + BCM6328_REG_LNKACTSEL_HI, 0); | |
382 | bcm6328_led_write(mem + BCM6328_REG_LNKACTSEL_LO, 0); | |
383 | ||
384 | val = bcm6328_led_read(mem + BCM6328_REG_INIT); | |
9f82c778 | 385 | val &= ~(BCM6328_INIT_MASK); |
fd7b025a ÁFR |
386 | if (of_property_read_bool(np, "brcm,serial-leds")) |
387 | val |= BCM6328_SERIAL_LED_EN; | |
9f82c778 ÁFR |
388 | if (of_property_read_bool(np, "brcm,serial-mux")) |
389 | val |= BCM6328_SERIAL_LED_MUX; | |
390 | if (of_property_read_bool(np, "brcm,serial-clk-low")) | |
391 | val |= BCM6328_SERIAL_LED_CLK_NPOL; | |
392 | if (!of_property_read_bool(np, "brcm,serial-dat-low")) | |
393 | val |= BCM6328_SERIAL_LED_DATA_PPOL; | |
394 | if (!of_property_read_bool(np, "brcm,serial-shift-inv")) | |
395 | val |= BCM6328_SERIAL_LED_SHIFT_DIR; | |
fd7b025a ÁFR |
396 | bcm6328_led_write(mem + BCM6328_REG_INIT, val); |
397 | ||
398 | for_each_available_child_of_node(np, child) { | |
399 | int rc; | |
400 | u32 reg; | |
401 | ||
402 | if (of_property_read_u32(child, "reg", ®)) | |
403 | continue; | |
404 | ||
405 | if (reg >= BCM6328_LED_MAX_COUNT) { | |
79653fbb | 406 | dev_err(dev, "invalid LED (%u >= %d)\n", reg, |
fd7b025a ÁFR |
407 | BCM6328_LED_MAX_COUNT); |
408 | continue; | |
409 | } | |
410 | ||
411 | if (of_property_read_bool(child, "brcm,hardware-controlled")) | |
412 | rc = bcm6328_hwled(dev, child, reg, mem, lock); | |
413 | else | |
414 | rc = bcm6328_led(dev, child, reg, mem, lock, | |
415 | blink_leds, blink_delay); | |
416 | ||
6cc76244 JL |
417 | if (rc < 0) { |
418 | of_node_put(child); | |
fd7b025a | 419 | return rc; |
6cc76244 | 420 | } |
fd7b025a ÁFR |
421 | } |
422 | ||
423 | return 0; | |
424 | } | |
425 | ||
426 | static const struct of_device_id bcm6328_leds_of_match[] = { | |
427 | { .compatible = "brcm,bcm6328-leds", }, | |
428 | { }, | |
429 | }; | |
6528ca19 | 430 | MODULE_DEVICE_TABLE(of, bcm6328_leds_of_match); |
fd7b025a ÁFR |
431 | |
432 | static struct platform_driver bcm6328_leds_driver = { | |
433 | .probe = bcm6328_leds_probe, | |
434 | .driver = { | |
435 | .name = "leds-bcm6328", | |
436 | .of_match_table = bcm6328_leds_of_match, | |
437 | }, | |
438 | }; | |
439 | ||
440 | module_platform_driver(bcm6328_leds_driver); | |
441 | ||
442 | MODULE_AUTHOR("Álvaro Fernández Rojas <noltari@gmail.com>"); | |
443 | MODULE_AUTHOR("Jonas Gorski <jogo@openwrt.org>"); | |
444 | MODULE_DESCRIPTION("LED driver for BCM6328 controllers"); | |
445 | MODULE_LICENSE("GPL v2"); | |
446 | MODULE_ALIAS("platform:leds-bcm6328"); |