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