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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
28#define BCM6328_LED_BLINK_DELAYS 2
29#define BCM6328_LED_BLINK_MS 20
30
31#define BCM6328_LED_BLINK_MASK 0x3f
32#define BCM6328_LED_BLINK1_SHIFT 0
33#define BCM6328_LED_BLINK1_MASK (BCM6328_LED_BLINK_MASK << \
34 BCM6328_LED_BLINK1_SHIFT)
35#define BCM6328_LED_BLINK2_SHIFT 6
36#define BCM6328_LED_BLINK2_MASK (BCM6328_LED_BLINK_MASK << \
37 BCM6328_LED_BLINK2_SHIFT)
38#define BCM6328_SERIAL_LED_EN BIT(12)
39#define BCM6328_SERIAL_LED_MUX BIT(13)
40#define BCM6328_SERIAL_LED_CLK_NPOL BIT(14)
41#define BCM6328_SERIAL_LED_DATA_PPOL BIT(15)
42#define BCM6328_SERIAL_LED_SHIFT_DIR BIT(16)
43#define BCM6328_LED_SHIFT_TEST BIT(30)
44#define BCM6328_LED_TEST BIT(31)
45#define BCM6328_INIT_MASK (BCM6328_SERIAL_LED_EN | \
46 BCM6328_SERIAL_LED_MUX | \
47 BCM6328_SERIAL_LED_CLK_NPOL | \
48 BCM6328_SERIAL_LED_DATA_PPOL | \
49 BCM6328_SERIAL_LED_SHIFT_DIR)
50
51#define BCM6328_LED_MODE_MASK 3
52#define BCM6328_LED_MODE_ON 0
53#define BCM6328_LED_MODE_BLINK1 1
54#define BCM6328_LED_MODE_BLINK2 2
55#define BCM6328_LED_MODE_OFF 3
56#define BCM6328_LED_SHIFT(X) ((X) << 1)
57
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66
67
68struct bcm6328_led {
69 struct led_classdev cdev;
70 void __iomem *mem;
71 spinlock_t *lock;
72 unsigned long pin;
73 unsigned long *blink_leds;
74 unsigned long *blink_delay;
75 bool active_low;
76};
77
78static void bcm6328_led_write(void __iomem *reg, unsigned long data)
79{
80#ifdef CONFIG_CPU_BIG_ENDIAN
81 iowrite32be(data, reg);
82#else
83 writel(data, reg);
84#endif
85}
86
87static unsigned long bcm6328_led_read(void __iomem *reg)
88{
89#ifdef CONFIG_CPU_BIG_ENDIAN
90 return ioread32be(reg);
91#else
92 return readl(reg);
93#endif
94}
95
96
97
98
99
100
101
102static unsigned long bcm6328_pin2shift(unsigned long pin)
103{
104 if (pin < 8)
105 return pin + 16;
106 else
107 return pin - 8;
108}
109
110static void bcm6328_led_mode(struct bcm6328_led *led, unsigned long value)
111{
112 void __iomem *mode;
113 unsigned long val, shift;
114
115 shift = bcm6328_pin2shift(led->pin);
116 if (shift / 16)
117 mode = led->mem + BCM6328_REG_MODE_HI;
118 else
119 mode = led->mem + BCM6328_REG_MODE_LO;
120
121 val = bcm6328_led_read(mode);
122 val &= ~(BCM6328_LED_MODE_MASK << BCM6328_LED_SHIFT(shift % 16));
123 val |= (value << BCM6328_LED_SHIFT(shift % 16));
124 bcm6328_led_write(mode, val);
125}
126
127static void bcm6328_led_set(struct led_classdev *led_cdev,
128 enum led_brightness value)
129{
130 struct bcm6328_led *led =
131 container_of(led_cdev, struct bcm6328_led, cdev);
132 unsigned long flags;
133
134 spin_lock_irqsave(led->lock, flags);
135
136
137 led->blink_leds[0] &= ~BIT(led->pin);
138 led->blink_leds[1] &= ~BIT(led->pin);
139
140
141 if ((led->active_low && value == LED_OFF) ||
142 (!led->active_low && value != LED_OFF))
143 bcm6328_led_mode(led, BCM6328_LED_MODE_ON);
144 else
145 bcm6328_led_mode(led, BCM6328_LED_MODE_OFF);
146
147 spin_unlock_irqrestore(led->lock, flags);
148}
149
150static unsigned long bcm6328_blink_delay(unsigned long delay)
151{
152 unsigned long bcm6328_delay;
153
154 bcm6328_delay = delay + BCM6328_LED_BLINK_MS / 2;
155 bcm6328_delay = bcm6328_delay / BCM6328_LED_BLINK_MS;
156 if (bcm6328_delay == 0)
157 bcm6328_delay = 1;
158
159 return bcm6328_delay;
160}
161
162static int bcm6328_blink_set(struct led_classdev *led_cdev,
163 unsigned long *delay_on, unsigned long *delay_off)
164{
165 struct bcm6328_led *led =
166 container_of(led_cdev, struct bcm6328_led, cdev);
167 unsigned long delay, flags;
168 int rc;
169
170 if (!*delay_on)
171 *delay_on = BCM6328_LED_DEF_DELAY;
172 if (!*delay_off)
173 *delay_off = BCM6328_LED_DEF_DELAY;
174
175 delay = bcm6328_blink_delay(*delay_on);
176 if (delay != bcm6328_blink_delay(*delay_off)) {
177 dev_dbg(led_cdev->dev,
178 "fallback to soft blinking (delay_on != delay_off)\n");
179 return -EINVAL;
180 }
181
182 if (delay > BCM6328_LED_BLINK_MASK) {
183 dev_dbg(led_cdev->dev,
184 "fallback to soft blinking (delay > %ums)\n",
185 BCM6328_LED_BLINK_MASK * BCM6328_LED_BLINK_MS);
186 return -EINVAL;
187 }
188
189 spin_lock_irqsave(led->lock, flags);
190
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193
194
195
196
197 if (led->blink_leds[0] == 0 ||
198 led->blink_leds[0] == BIT(led->pin) ||
199 led->blink_delay[0] == delay) {
200 unsigned long val;
201
202
203 led->blink_leds[0] |= BIT(led->pin);
204
205
206 led->blink_leds[1] &= ~BIT(led->pin);
207
208
209 led->blink_delay[0] = delay;
210
211
212 val = bcm6328_led_read(led->mem + BCM6328_REG_INIT);
213 val &= ~BCM6328_LED_BLINK1_MASK;
214 val |= (delay << BCM6328_LED_BLINK1_SHIFT);
215 bcm6328_led_write(led->mem + BCM6328_REG_INIT, val);
216
217
218 bcm6328_led_mode(led, BCM6328_LED_MODE_BLINK1);
219
220 rc = 0;
221 } else if (led->blink_leds[1] == 0 ||
222 led->blink_leds[1] == BIT(led->pin) ||
223 led->blink_delay[1] == delay) {
224 unsigned long val;
225
226
227 led->blink_leds[0] &= ~BIT(led->pin);
228
229
230 led->blink_leds[1] |= BIT(led->pin);
231
232
233 led->blink_delay[1] = delay;
234
235
236 val = bcm6328_led_read(led->mem + BCM6328_REG_INIT);
237 val &= ~BCM6328_LED_BLINK2_MASK;
238 val |= (delay << BCM6328_LED_BLINK2_SHIFT);
239 bcm6328_led_write(led->mem + BCM6328_REG_INIT, val);
240
241
242 bcm6328_led_mode(led, BCM6328_LED_MODE_BLINK2);
243
244 rc = 0;
245 } else {
246 dev_dbg(led_cdev->dev,
247 "fallback to soft blinking (delay already set)\n");
248 rc = -EINVAL;
249 }
250 spin_unlock_irqrestore(led->lock, flags);
251
252 return rc;
253}
254
255static int bcm6328_hwled(struct device *dev, struct device_node *nc, u32 reg,
256 void __iomem *mem, spinlock_t *lock)
257{
258 int i, cnt;
259 unsigned long flags, val;
260
261 spin_lock_irqsave(lock, flags);
262 val = bcm6328_led_read(mem + BCM6328_REG_HWDIS);
263 val &= ~BIT(reg);
264 bcm6328_led_write(mem + BCM6328_REG_HWDIS, val);
265 spin_unlock_irqrestore(lock, flags);
266
267
268 if (reg >= 8)
269 return 0;
270
271 cnt = of_property_count_elems_of_size(nc, "brcm,link-signal-sources",
272 sizeof(u32));
273 for (i = 0; i < cnt; i++) {
274 u32 sel;
275 void __iomem *addr;
276
277 if (reg < 4)
278 addr = mem + BCM6328_REG_LNKACTSEL_LO;
279 else
280 addr = mem + BCM6328_REG_LNKACTSEL_HI;
281
282 of_property_read_u32_index(nc, "brcm,link-signal-sources", i,
283 &sel);
284
285 if (reg / 4 != sel / 4) {
286 dev_warn(dev, "invalid link signal source\n");
287 continue;
288 }
289
290 spin_lock_irqsave(lock, flags);
291 val = bcm6328_led_read(addr);
292 val |= (BIT(reg % 4) << (((sel % 4) * 4) + 16));
293 bcm6328_led_write(addr, val);
294 spin_unlock_irqrestore(lock, flags);
295 }
296
297 cnt = of_property_count_elems_of_size(nc,
298 "brcm,activity-signal-sources",
299 sizeof(u32));
300 for (i = 0; i < cnt; i++) {
301 u32 sel;
302 void __iomem *addr;
303
304 if (reg < 4)
305 addr = mem + BCM6328_REG_LNKACTSEL_LO;
306 else
307 addr = mem + BCM6328_REG_LNKACTSEL_HI;
308
309 of_property_read_u32_index(nc, "brcm,activity-signal-sources",
310 i, &sel);
311
312 if (reg / 4 != sel / 4) {
313 dev_warn(dev, "invalid activity signal source\n");
314 continue;
315 }
316
317 spin_lock_irqsave(lock, flags);
318 val = bcm6328_led_read(addr);
319 val |= (BIT(reg % 4) << ((sel % 4) * 4));
320 bcm6328_led_write(addr, val);
321 spin_unlock_irqrestore(lock, flags);
322 }
323
324 return 0;
325}
326
327static int bcm6328_led(struct device *dev, struct device_node *nc, u32 reg,
328 void __iomem *mem, spinlock_t *lock,
329 unsigned long *blink_leds, unsigned long *blink_delay)
330{
331 struct bcm6328_led *led;
332 const char *state;
333 int rc;
334
335 led = devm_kzalloc(dev, sizeof(*led), GFP_KERNEL);
336 if (!led)
337 return -ENOMEM;
338
339 led->pin = reg;
340 led->mem = mem;
341 led->lock = lock;
342 led->blink_leds = blink_leds;
343 led->blink_delay = blink_delay;
344
345 if (of_property_read_bool(nc, "active-low"))
346 led->active_low = true;
347
348 led->cdev.name = of_get_property(nc, "label", NULL) ? : nc->name;
349 led->cdev.default_trigger = of_get_property(nc,
350 "linux,default-trigger",
351 NULL);
352
353 if (!of_property_read_string(nc, "default-state", &state)) {
354 if (!strcmp(state, "on")) {
355 led->cdev.brightness = LED_FULL;
356 } else if (!strcmp(state, "keep")) {
357 void __iomem *mode;
358 unsigned long val, shift;
359
360 shift = bcm6328_pin2shift(led->pin);
361 if (shift / 16)
362 mode = mem + BCM6328_REG_MODE_HI;
363 else
364 mode = mem + BCM6328_REG_MODE_LO;
365
366 val = bcm6328_led_read(mode) >>
367 BCM6328_LED_SHIFT(shift % 16);
368 val &= BCM6328_LED_MODE_MASK;
369 if ((led->active_low && val == BCM6328_LED_MODE_OFF) ||
370 (!led->active_low && val == BCM6328_LED_MODE_ON))
371 led->cdev.brightness = LED_FULL;
372 else
373 led->cdev.brightness = LED_OFF;
374 } else {
375 led->cdev.brightness = LED_OFF;
376 }
377 } else {
378 led->cdev.brightness = LED_OFF;
379 }
380
381 bcm6328_led_set(&led->cdev, led->cdev.brightness);
382
383 led->cdev.brightness_set = bcm6328_led_set;
384 led->cdev.blink_set = bcm6328_blink_set;
385
386 rc = led_classdev_register(dev, &led->cdev);
387 if (rc < 0)
388 return rc;
389
390 dev_dbg(dev, "registered LED %s\n", led->cdev.name);
391
392 return 0;
393}
394
395static int bcm6328_leds_probe(struct platform_device *pdev)
396{
397 struct device *dev = &pdev->dev;
398 struct device_node *np = pdev->dev.of_node;
399 struct device_node *child;
400 void __iomem *mem;
401 spinlock_t *lock;
402 unsigned long val, *blink_leds, *blink_delay;
403
404 mem = devm_platform_ioremap_resource(pdev, 0);
405 if (IS_ERR(mem))
406 return PTR_ERR(mem);
407
408 lock = devm_kzalloc(dev, sizeof(*lock), GFP_KERNEL);
409 if (!lock)
410 return -ENOMEM;
411
412 blink_leds = devm_kcalloc(dev, BCM6328_LED_BLINK_DELAYS,
413 sizeof(*blink_leds), GFP_KERNEL);
414 if (!blink_leds)
415 return -ENOMEM;
416
417 blink_delay = devm_kcalloc(dev, BCM6328_LED_BLINK_DELAYS,
418 sizeof(*blink_delay), GFP_KERNEL);
419 if (!blink_delay)
420 return -ENOMEM;
421
422 spin_lock_init(lock);
423
424 bcm6328_led_write(mem + BCM6328_REG_HWDIS, ~0);
425 bcm6328_led_write(mem + BCM6328_REG_LNKACTSEL_HI, 0);
426 bcm6328_led_write(mem + BCM6328_REG_LNKACTSEL_LO, 0);
427
428 val = bcm6328_led_read(mem + BCM6328_REG_INIT);
429 val &= ~(BCM6328_INIT_MASK);
430 if (of_property_read_bool(np, "brcm,serial-leds"))
431 val |= BCM6328_SERIAL_LED_EN;
432 if (of_property_read_bool(np, "brcm,serial-mux"))
433 val |= BCM6328_SERIAL_LED_MUX;
434 if (of_property_read_bool(np, "brcm,serial-clk-low"))
435 val |= BCM6328_SERIAL_LED_CLK_NPOL;
436 if (!of_property_read_bool(np, "brcm,serial-dat-low"))
437 val |= BCM6328_SERIAL_LED_DATA_PPOL;
438 if (!of_property_read_bool(np, "brcm,serial-shift-inv"))
439 val |= BCM6328_SERIAL_LED_SHIFT_DIR;
440 bcm6328_led_write(mem + BCM6328_REG_INIT, val);
441
442 for_each_available_child_of_node(np, child) {
443 int rc;
444 u32 reg;
445
446 if (of_property_read_u32(child, "reg", ®))
447 continue;
448
449 if (reg >= BCM6328_LED_MAX_COUNT) {
450 dev_err(dev, "invalid LED (%u >= %d)\n", reg,
451 BCM6328_LED_MAX_COUNT);
452 continue;
453 }
454
455 if (of_property_read_bool(child, "brcm,hardware-controlled"))
456 rc = bcm6328_hwled(dev, child, reg, mem, lock);
457 else
458 rc = bcm6328_led(dev, child, reg, mem, lock,
459 blink_leds, blink_delay);
460
461 if (rc < 0) {
462 of_node_put(child);
463 return rc;
464 }
465 }
466
467 return 0;
468}
469
470static const struct of_device_id bcm6328_leds_of_match[] = {
471 { .compatible = "brcm,bcm6328-leds", },
472 { },
473};
474MODULE_DEVICE_TABLE(of, bcm6328_leds_of_match);
475
476static struct platform_driver bcm6328_leds_driver = {
477 .probe = bcm6328_leds_probe,
478 .driver = {
479 .name = "leds-bcm6328",
480 .of_match_table = bcm6328_leds_of_match,
481 },
482};
483
484module_platform_driver(bcm6328_leds_driver);
485
486MODULE_AUTHOR("Álvaro Fernández Rojas <noltari@gmail.com>");
487MODULE_AUTHOR("Jonas Gorski <jogo@openwrt.org>");
488MODULE_DESCRIPTION("LED driver for BCM6328 controllers");
489MODULE_LICENSE("GPL v2");
490MODULE_ALIAS("platform:leds-bcm6328");
491