Commit | Line | Data |
---|---|---|
25518e02 BW |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* | |
3 | * Copyright (C) 2018 Spreadtrum Communications Inc. | |
4 | * Copyright (C) 2018 Linaro Ltd. | |
5 | */ | |
6 | ||
7 | #include <linux/bitops.h> | |
8 | #include <linux/gpio/driver.h> | |
9 | #include <linux/interrupt.h> | |
10 | #include <linux/kernel.h> | |
11 | #include <linux/module.h> | |
12 | #include <linux/of_device.h> | |
13 | #include <linux/platform_device.h> | |
14 | #include <linux/spinlock.h> | |
15 | ||
16 | /* EIC registers definition */ | |
17 | #define SPRD_EIC_DBNC_DATA 0x0 | |
18 | #define SPRD_EIC_DBNC_DMSK 0x4 | |
19 | #define SPRD_EIC_DBNC_IEV 0x14 | |
20 | #define SPRD_EIC_DBNC_IE 0x18 | |
21 | #define SPRD_EIC_DBNC_RIS 0x1c | |
22 | #define SPRD_EIC_DBNC_MIS 0x20 | |
23 | #define SPRD_EIC_DBNC_IC 0x24 | |
24 | #define SPRD_EIC_DBNC_TRIG 0x28 | |
25 | #define SPRD_EIC_DBNC_CTRL0 0x40 | |
26 | ||
27 | #define SPRD_EIC_LATCH_INTEN 0x0 | |
28 | #define SPRD_EIC_LATCH_INTRAW 0x4 | |
29 | #define SPRD_EIC_LATCH_INTMSK 0x8 | |
30 | #define SPRD_EIC_LATCH_INTCLR 0xc | |
31 | #define SPRD_EIC_LATCH_INTPOL 0x10 | |
32 | #define SPRD_EIC_LATCH_INTMODE 0x14 | |
33 | ||
34 | #define SPRD_EIC_ASYNC_INTIE 0x0 | |
35 | #define SPRD_EIC_ASYNC_INTRAW 0x4 | |
36 | #define SPRD_EIC_ASYNC_INTMSK 0x8 | |
37 | #define SPRD_EIC_ASYNC_INTCLR 0xc | |
38 | #define SPRD_EIC_ASYNC_INTMODE 0x10 | |
39 | #define SPRD_EIC_ASYNC_INTBOTH 0x14 | |
40 | #define SPRD_EIC_ASYNC_INTPOL 0x18 | |
41 | #define SPRD_EIC_ASYNC_DATA 0x1c | |
42 | ||
43 | #define SPRD_EIC_SYNC_INTIE 0x0 | |
44 | #define SPRD_EIC_SYNC_INTRAW 0x4 | |
45 | #define SPRD_EIC_SYNC_INTMSK 0x8 | |
46 | #define SPRD_EIC_SYNC_INTCLR 0xc | |
47 | #define SPRD_EIC_SYNC_INTMODE 0x10 | |
48 | #define SPRD_EIC_SYNC_INTBOTH 0x14 | |
49 | #define SPRD_EIC_SYNC_INTPOL 0x18 | |
50 | #define SPRD_EIC_SYNC_DATA 0x1c | |
51 | ||
52 | /* | |
53 | * The digital-chip EIC controller can support maximum 3 banks, and each bank | |
54 | * contains 8 EICs. | |
55 | */ | |
56 | #define SPRD_EIC_MAX_BANK 3 | |
57 | #define SPRD_EIC_PER_BANK_NR 8 | |
58 | #define SPRD_EIC_DATA_MASK GENMASK(7, 0) | |
59 | #define SPRD_EIC_BIT(x) ((x) & (SPRD_EIC_PER_BANK_NR - 1)) | |
60 | #define SPRD_EIC_DBNC_MASK GENMASK(11, 0) | |
61 | ||
62 | /* | |
63 | * The Spreadtrum EIC (external interrupt controller) can be used only in | |
64 | * input mode to generate interrupts if detecting input signals. | |
65 | * | |
66 | * The Spreadtrum digital-chip EIC controller contains 4 sub-modules: | |
67 | * debounce EIC, latch EIC, async EIC and sync EIC, | |
68 | * | |
69 | * The debounce EIC is used to capture the input signals' stable status | |
70 | * (millisecond resolution) and a single-trigger mechanism is introduced | |
71 | * into this sub-module to enhance the input event detection reliability. | |
72 | * The debounce range is from 1ms to 4s with a step size of 1ms. | |
73 | * | |
74 | * The latch EIC is used to latch some special power down signals and | |
75 | * generate interrupts, since the latch EIC does not depend on the APB clock | |
76 | * to capture signals. | |
77 | * | |
78 | * The async EIC uses a 32k clock to capture the short signals (microsecond | |
79 | * resolution) to generate interrupts by level or edge trigger. | |
80 | * | |
81 | * The EIC-sync is similar with GPIO's input function, which is a synchronized | |
82 | * signal input register. | |
83 | */ | |
84 | enum sprd_eic_type { | |
85 | SPRD_EIC_DEBOUNCE, | |
86 | SPRD_EIC_LATCH, | |
87 | SPRD_EIC_ASYNC, | |
88 | SPRD_EIC_SYNC, | |
89 | SPRD_EIC_MAX, | |
90 | }; | |
91 | ||
92 | struct sprd_eic { | |
93 | struct gpio_chip chip; | |
94 | struct irq_chip intc; | |
95 | void __iomem *base[SPRD_EIC_MAX_BANK]; | |
96 | enum sprd_eic_type type; | |
97 | spinlock_t lock; | |
98 | int irq; | |
99 | }; | |
100 | ||
101 | struct sprd_eic_variant_data { | |
102 | enum sprd_eic_type type; | |
103 | u32 num_eics; | |
104 | }; | |
105 | ||
106 | static const char *sprd_eic_label_name[SPRD_EIC_MAX] = { | |
107 | "eic-debounce", "eic-latch", "eic-async", | |
108 | "eic-sync", | |
109 | }; | |
110 | ||
111 | static const struct sprd_eic_variant_data sc9860_eic_dbnc_data = { | |
112 | .type = SPRD_EIC_DEBOUNCE, | |
113 | .num_eics = 8, | |
114 | }; | |
115 | ||
116 | static const struct sprd_eic_variant_data sc9860_eic_latch_data = { | |
117 | .type = SPRD_EIC_LATCH, | |
118 | .num_eics = 8, | |
119 | }; | |
120 | ||
121 | static const struct sprd_eic_variant_data sc9860_eic_async_data = { | |
122 | .type = SPRD_EIC_ASYNC, | |
123 | .num_eics = 8, | |
124 | }; | |
125 | ||
126 | static const struct sprd_eic_variant_data sc9860_eic_sync_data = { | |
127 | .type = SPRD_EIC_SYNC, | |
128 | .num_eics = 8, | |
129 | }; | |
130 | ||
131 | static inline void __iomem *sprd_eic_offset_base(struct sprd_eic *sprd_eic, | |
132 | unsigned int bank) | |
133 | { | |
134 | if (bank >= SPRD_EIC_MAX_BANK) | |
135 | return NULL; | |
136 | ||
137 | return sprd_eic->base[bank]; | |
138 | } | |
139 | ||
140 | static void sprd_eic_update(struct gpio_chip *chip, unsigned int offset, | |
141 | u16 reg, unsigned int val) | |
142 | { | |
143 | struct sprd_eic *sprd_eic = gpiochip_get_data(chip); | |
144 | void __iomem *base = | |
145 | sprd_eic_offset_base(sprd_eic, offset / SPRD_EIC_PER_BANK_NR); | |
146 | unsigned long flags; | |
147 | u32 tmp; | |
148 | ||
149 | spin_lock_irqsave(&sprd_eic->lock, flags); | |
150 | tmp = readl_relaxed(base + reg); | |
151 | ||
152 | if (val) | |
153 | tmp |= BIT(SPRD_EIC_BIT(offset)); | |
154 | else | |
155 | tmp &= ~BIT(SPRD_EIC_BIT(offset)); | |
156 | ||
157 | writel_relaxed(tmp, base + reg); | |
158 | spin_unlock_irqrestore(&sprd_eic->lock, flags); | |
159 | } | |
160 | ||
161 | static int sprd_eic_read(struct gpio_chip *chip, unsigned int offset, u16 reg) | |
162 | { | |
163 | struct sprd_eic *sprd_eic = gpiochip_get_data(chip); | |
164 | void __iomem *base = | |
165 | sprd_eic_offset_base(sprd_eic, offset / SPRD_EIC_PER_BANK_NR); | |
166 | ||
167 | return !!(readl_relaxed(base + reg) & BIT(SPRD_EIC_BIT(offset))); | |
168 | } | |
169 | ||
170 | static int sprd_eic_request(struct gpio_chip *chip, unsigned int offset) | |
171 | { | |
172 | sprd_eic_update(chip, offset, SPRD_EIC_DBNC_DMSK, 1); | |
173 | return 0; | |
174 | } | |
175 | ||
176 | static void sprd_eic_free(struct gpio_chip *chip, unsigned int offset) | |
177 | { | |
178 | sprd_eic_update(chip, offset, SPRD_EIC_DBNC_DMSK, 0); | |
179 | } | |
180 | ||
181 | static int sprd_eic_get(struct gpio_chip *chip, unsigned int offset) | |
182 | { | |
183 | return sprd_eic_read(chip, offset, SPRD_EIC_DBNC_DATA); | |
184 | } | |
185 | ||
186 | static int sprd_eic_direction_input(struct gpio_chip *chip, unsigned int offset) | |
187 | { | |
188 | /* EICs are always input, nothing need to do here. */ | |
189 | return 0; | |
190 | } | |
191 | ||
192 | static void sprd_eic_set(struct gpio_chip *chip, unsigned int offset, int value) | |
193 | { | |
194 | /* EICs are always input, nothing need to do here. */ | |
195 | } | |
196 | ||
197 | static int sprd_eic_set_debounce(struct gpio_chip *chip, unsigned int offset, | |
198 | unsigned int debounce) | |
199 | { | |
200 | struct sprd_eic *sprd_eic = gpiochip_get_data(chip); | |
201 | void __iomem *base = | |
202 | sprd_eic_offset_base(sprd_eic, offset / SPRD_EIC_PER_BANK_NR); | |
203 | u32 reg = SPRD_EIC_DBNC_CTRL0 + SPRD_EIC_BIT(offset) * 0x4; | |
204 | u32 value = readl_relaxed(base + reg) & ~SPRD_EIC_DBNC_MASK; | |
205 | ||
206 | value |= (debounce / 1000) & SPRD_EIC_DBNC_MASK; | |
207 | writel_relaxed(value, base + reg); | |
208 | ||
209 | return 0; | |
210 | } | |
211 | ||
212 | static int sprd_eic_set_config(struct gpio_chip *chip, unsigned int offset, | |
213 | unsigned long config) | |
214 | { | |
215 | unsigned long param = pinconf_to_config_param(config); | |
216 | u32 arg = pinconf_to_config_argument(config); | |
217 | ||
218 | if (param == PIN_CONFIG_INPUT_DEBOUNCE) | |
219 | return sprd_eic_set_debounce(chip, offset, arg); | |
220 | ||
221 | return -ENOTSUPP; | |
222 | } | |
223 | ||
224 | static void sprd_eic_irq_mask(struct irq_data *data) | |
225 | { | |
226 | struct gpio_chip *chip = irq_data_get_irq_chip_data(data); | |
227 | struct sprd_eic *sprd_eic = gpiochip_get_data(chip); | |
228 | u32 offset = irqd_to_hwirq(data); | |
229 | ||
230 | switch (sprd_eic->type) { | |
231 | case SPRD_EIC_DEBOUNCE: | |
232 | sprd_eic_update(chip, offset, SPRD_EIC_DBNC_IE, 0); | |
233 | sprd_eic_update(chip, offset, SPRD_EIC_DBNC_TRIG, 0); | |
234 | break; | |
235 | case SPRD_EIC_LATCH: | |
236 | sprd_eic_update(chip, offset, SPRD_EIC_LATCH_INTEN, 0); | |
237 | break; | |
238 | case SPRD_EIC_ASYNC: | |
239 | sprd_eic_update(chip, offset, SPRD_EIC_ASYNC_INTIE, 0); | |
240 | break; | |
241 | case SPRD_EIC_SYNC: | |
242 | sprd_eic_update(chip, offset, SPRD_EIC_SYNC_INTIE, 0); | |
243 | break; | |
244 | default: | |
245 | dev_err(chip->parent, "Unsupported EIC type.\n"); | |
246 | } | |
247 | } | |
248 | ||
249 | static void sprd_eic_irq_unmask(struct irq_data *data) | |
250 | { | |
251 | struct gpio_chip *chip = irq_data_get_irq_chip_data(data); | |
252 | struct sprd_eic *sprd_eic = gpiochip_get_data(chip); | |
253 | u32 offset = irqd_to_hwirq(data); | |
254 | ||
255 | switch (sprd_eic->type) { | |
256 | case SPRD_EIC_DEBOUNCE: | |
257 | sprd_eic_update(chip, offset, SPRD_EIC_DBNC_IE, 1); | |
258 | sprd_eic_update(chip, offset, SPRD_EIC_DBNC_TRIG, 1); | |
259 | break; | |
260 | case SPRD_EIC_LATCH: | |
261 | sprd_eic_update(chip, offset, SPRD_EIC_LATCH_INTEN, 1); | |
262 | break; | |
263 | case SPRD_EIC_ASYNC: | |
264 | sprd_eic_update(chip, offset, SPRD_EIC_ASYNC_INTIE, 1); | |
265 | break; | |
266 | case SPRD_EIC_SYNC: | |
267 | sprd_eic_update(chip, offset, SPRD_EIC_SYNC_INTIE, 1); | |
268 | break; | |
269 | default: | |
270 | dev_err(chip->parent, "Unsupported EIC type.\n"); | |
271 | } | |
272 | } | |
273 | ||
274 | static void sprd_eic_irq_ack(struct irq_data *data) | |
275 | { | |
276 | struct gpio_chip *chip = irq_data_get_irq_chip_data(data); | |
277 | struct sprd_eic *sprd_eic = gpiochip_get_data(chip); | |
278 | u32 offset = irqd_to_hwirq(data); | |
279 | ||
280 | switch (sprd_eic->type) { | |
281 | case SPRD_EIC_DEBOUNCE: | |
282 | sprd_eic_update(chip, offset, SPRD_EIC_DBNC_IC, 1); | |
283 | break; | |
284 | case SPRD_EIC_LATCH: | |
285 | sprd_eic_update(chip, offset, SPRD_EIC_LATCH_INTCLR, 1); | |
286 | break; | |
287 | case SPRD_EIC_ASYNC: | |
288 | sprd_eic_update(chip, offset, SPRD_EIC_ASYNC_INTCLR, 1); | |
289 | break; | |
290 | case SPRD_EIC_SYNC: | |
291 | sprd_eic_update(chip, offset, SPRD_EIC_SYNC_INTCLR, 1); | |
292 | break; | |
293 | default: | |
294 | dev_err(chip->parent, "Unsupported EIC type.\n"); | |
295 | } | |
296 | } | |
297 | ||
298 | static int sprd_eic_irq_set_type(struct irq_data *data, unsigned int flow_type) | |
299 | { | |
300 | struct gpio_chip *chip = irq_data_get_irq_chip_data(data); | |
301 | struct sprd_eic *sprd_eic = gpiochip_get_data(chip); | |
302 | u32 offset = irqd_to_hwirq(data); | |
7bf0d7f6 | 303 | int state; |
25518e02 BW |
304 | |
305 | switch (sprd_eic->type) { | |
306 | case SPRD_EIC_DEBOUNCE: | |
307 | switch (flow_type) { | |
308 | case IRQ_TYPE_LEVEL_HIGH: | |
309 | sprd_eic_update(chip, offset, SPRD_EIC_DBNC_IEV, 1); | |
310 | break; | |
311 | case IRQ_TYPE_LEVEL_LOW: | |
312 | sprd_eic_update(chip, offset, SPRD_EIC_DBNC_IEV, 0); | |
313 | break; | |
7bf0d7f6 BW |
314 | case IRQ_TYPE_EDGE_RISING: |
315 | case IRQ_TYPE_EDGE_FALLING: | |
316 | case IRQ_TYPE_EDGE_BOTH: | |
317 | state = sprd_eic_get(chip, offset); | |
318 | if (state) | |
319 | sprd_eic_update(chip, offset, | |
320 | SPRD_EIC_DBNC_IEV, 0); | |
321 | else | |
322 | sprd_eic_update(chip, offset, | |
323 | SPRD_EIC_DBNC_IEV, 1); | |
324 | break; | |
25518e02 BW |
325 | default: |
326 | return -ENOTSUPP; | |
327 | } | |
328 | ||
329 | irq_set_handler_locked(data, handle_level_irq); | |
330 | break; | |
331 | case SPRD_EIC_LATCH: | |
332 | switch (flow_type) { | |
333 | case IRQ_TYPE_LEVEL_HIGH: | |
334 | sprd_eic_update(chip, offset, SPRD_EIC_LATCH_INTPOL, 0); | |
335 | break; | |
336 | case IRQ_TYPE_LEVEL_LOW: | |
337 | sprd_eic_update(chip, offset, SPRD_EIC_LATCH_INTPOL, 1); | |
338 | break; | |
7bf0d7f6 BW |
339 | case IRQ_TYPE_EDGE_RISING: |
340 | case IRQ_TYPE_EDGE_FALLING: | |
341 | case IRQ_TYPE_EDGE_BOTH: | |
342 | state = sprd_eic_get(chip, offset); | |
343 | if (state) | |
344 | sprd_eic_update(chip, offset, | |
345 | SPRD_EIC_LATCH_INTPOL, 0); | |
346 | else | |
347 | sprd_eic_update(chip, offset, | |
348 | SPRD_EIC_LATCH_INTPOL, 1); | |
349 | break; | |
25518e02 BW |
350 | default: |
351 | return -ENOTSUPP; | |
352 | } | |
353 | ||
354 | irq_set_handler_locked(data, handle_level_irq); | |
355 | break; | |
356 | case SPRD_EIC_ASYNC: | |
357 | switch (flow_type) { | |
358 | case IRQ_TYPE_EDGE_RISING: | |
359 | sprd_eic_update(chip, offset, SPRD_EIC_ASYNC_INTBOTH, 0); | |
360 | sprd_eic_update(chip, offset, SPRD_EIC_ASYNC_INTMODE, 0); | |
361 | sprd_eic_update(chip, offset, SPRD_EIC_ASYNC_INTPOL, 1); | |
362 | irq_set_handler_locked(data, handle_edge_irq); | |
363 | break; | |
364 | case IRQ_TYPE_EDGE_FALLING: | |
365 | sprd_eic_update(chip, offset, SPRD_EIC_ASYNC_INTBOTH, 0); | |
366 | sprd_eic_update(chip, offset, SPRD_EIC_ASYNC_INTMODE, 0); | |
367 | sprd_eic_update(chip, offset, SPRD_EIC_ASYNC_INTPOL, 0); | |
368 | irq_set_handler_locked(data, handle_edge_irq); | |
369 | break; | |
370 | case IRQ_TYPE_EDGE_BOTH: | |
371 | sprd_eic_update(chip, offset, SPRD_EIC_ASYNC_INTBOTH, 1); | |
372 | irq_set_handler_locked(data, handle_edge_irq); | |
373 | break; | |
374 | case IRQ_TYPE_LEVEL_HIGH: | |
375 | sprd_eic_update(chip, offset, SPRD_EIC_ASYNC_INTBOTH, 0); | |
376 | sprd_eic_update(chip, offset, SPRD_EIC_ASYNC_INTMODE, 1); | |
377 | sprd_eic_update(chip, offset, SPRD_EIC_ASYNC_INTPOL, 1); | |
378 | irq_set_handler_locked(data, handle_level_irq); | |
379 | break; | |
380 | case IRQ_TYPE_LEVEL_LOW: | |
381 | sprd_eic_update(chip, offset, SPRD_EIC_ASYNC_INTBOTH, 0); | |
382 | sprd_eic_update(chip, offset, SPRD_EIC_ASYNC_INTMODE, 1); | |
383 | sprd_eic_update(chip, offset, SPRD_EIC_ASYNC_INTPOL, 0); | |
384 | irq_set_handler_locked(data, handle_level_irq); | |
385 | break; | |
386 | default: | |
387 | return -ENOTSUPP; | |
388 | } | |
389 | break; | |
390 | case SPRD_EIC_SYNC: | |
391 | switch (flow_type) { | |
392 | case IRQ_TYPE_EDGE_RISING: | |
393 | sprd_eic_update(chip, offset, SPRD_EIC_SYNC_INTBOTH, 0); | |
394 | sprd_eic_update(chip, offset, SPRD_EIC_SYNC_INTMODE, 0); | |
395 | sprd_eic_update(chip, offset, SPRD_EIC_SYNC_INTPOL, 1); | |
396 | irq_set_handler_locked(data, handle_edge_irq); | |
397 | break; | |
398 | case IRQ_TYPE_EDGE_FALLING: | |
399 | sprd_eic_update(chip, offset, SPRD_EIC_SYNC_INTBOTH, 0); | |
400 | sprd_eic_update(chip, offset, SPRD_EIC_SYNC_INTMODE, 0); | |
401 | sprd_eic_update(chip, offset, SPRD_EIC_SYNC_INTPOL, 0); | |
402 | irq_set_handler_locked(data, handle_edge_irq); | |
403 | break; | |
404 | case IRQ_TYPE_EDGE_BOTH: | |
405 | sprd_eic_update(chip, offset, SPRD_EIC_SYNC_INTBOTH, 1); | |
406 | irq_set_handler_locked(data, handle_edge_irq); | |
407 | break; | |
408 | case IRQ_TYPE_LEVEL_HIGH: | |
409 | sprd_eic_update(chip, offset, SPRD_EIC_SYNC_INTBOTH, 0); | |
410 | sprd_eic_update(chip, offset, SPRD_EIC_SYNC_INTMODE, 1); | |
411 | sprd_eic_update(chip, offset, SPRD_EIC_SYNC_INTPOL, 1); | |
412 | irq_set_handler_locked(data, handle_level_irq); | |
413 | break; | |
414 | case IRQ_TYPE_LEVEL_LOW: | |
415 | sprd_eic_update(chip, offset, SPRD_EIC_SYNC_INTBOTH, 0); | |
416 | sprd_eic_update(chip, offset, SPRD_EIC_SYNC_INTMODE, 1); | |
417 | sprd_eic_update(chip, offset, SPRD_EIC_SYNC_INTPOL, 0); | |
418 | irq_set_handler_locked(data, handle_level_irq); | |
419 | break; | |
420 | default: | |
421 | return -ENOTSUPP; | |
422 | } | |
423 | default: | |
424 | dev_err(chip->parent, "Unsupported EIC type.\n"); | |
425 | return -ENOTSUPP; | |
426 | } | |
427 | ||
428 | return 0; | |
429 | } | |
430 | ||
7bf0d7f6 BW |
431 | static void sprd_eic_toggle_trigger(struct gpio_chip *chip, unsigned int irq, |
432 | unsigned int offset) | |
433 | { | |
434 | struct sprd_eic *sprd_eic = gpiochip_get_data(chip); | |
435 | struct irq_data *data = irq_get_irq_data(irq); | |
436 | u32 trigger = irqd_get_trigger_type(data); | |
437 | int state, post_state; | |
438 | ||
439 | /* | |
440 | * The debounce EIC and latch EIC can only support level trigger, so we | |
441 | * can toggle the level trigger to emulate the edge trigger. | |
442 | */ | |
443 | if ((sprd_eic->type != SPRD_EIC_DEBOUNCE && | |
444 | sprd_eic->type != SPRD_EIC_LATCH) || | |
445 | !(trigger & IRQ_TYPE_EDGE_BOTH)) | |
446 | return; | |
447 | ||
448 | sprd_eic_irq_mask(data); | |
449 | state = sprd_eic_get(chip, offset); | |
450 | ||
451 | retry: | |
452 | switch (sprd_eic->type) { | |
453 | case SPRD_EIC_DEBOUNCE: | |
454 | if (state) | |
455 | sprd_eic_update(chip, offset, SPRD_EIC_DBNC_IEV, 0); | |
456 | else | |
457 | sprd_eic_update(chip, offset, SPRD_EIC_DBNC_IEV, 1); | |
458 | break; | |
459 | case SPRD_EIC_LATCH: | |
460 | if (state) | |
461 | sprd_eic_update(chip, offset, SPRD_EIC_LATCH_INTPOL, 0); | |
462 | else | |
463 | sprd_eic_update(chip, offset, SPRD_EIC_LATCH_INTPOL, 1); | |
464 | break; | |
465 | default: | |
466 | sprd_eic_irq_unmask(data); | |
467 | return; | |
468 | } | |
469 | ||
470 | post_state = sprd_eic_get(chip, offset); | |
471 | if (state != post_state) { | |
472 | dev_warn(chip->parent, "EIC level was changed.\n"); | |
473 | state = post_state; | |
474 | goto retry; | |
475 | } | |
476 | ||
477 | sprd_eic_irq_unmask(data); | |
478 | } | |
479 | ||
25518e02 BW |
480 | static int sprd_eic_match_chip_by_type(struct gpio_chip *chip, void *data) |
481 | { | |
482 | enum sprd_eic_type type = *(enum sprd_eic_type *)data; | |
483 | ||
484 | return !strcmp(chip->label, sprd_eic_label_name[type]); | |
485 | } | |
486 | ||
487 | static void sprd_eic_handle_one_type(struct gpio_chip *chip) | |
488 | { | |
489 | struct sprd_eic *sprd_eic = gpiochip_get_data(chip); | |
490 | u32 bank, n, girq; | |
491 | ||
492 | for (bank = 0; bank * SPRD_EIC_PER_BANK_NR < chip->ngpio; bank++) { | |
493 | void __iomem *base = sprd_eic_offset_base(sprd_eic, bank); | |
494 | unsigned long reg; | |
495 | ||
496 | switch (sprd_eic->type) { | |
497 | case SPRD_EIC_DEBOUNCE: | |
498 | reg = readl_relaxed(base + SPRD_EIC_DBNC_MIS) & | |
499 | SPRD_EIC_DATA_MASK; | |
500 | break; | |
501 | case SPRD_EIC_LATCH: | |
502 | reg = readl_relaxed(base + SPRD_EIC_LATCH_INTMSK) & | |
503 | SPRD_EIC_DATA_MASK; | |
504 | break; | |
505 | case SPRD_EIC_ASYNC: | |
506 | reg = readl_relaxed(base + SPRD_EIC_ASYNC_INTMSK) & | |
507 | SPRD_EIC_DATA_MASK; | |
508 | break; | |
509 | case SPRD_EIC_SYNC: | |
510 | reg = readl_relaxed(base + SPRD_EIC_SYNC_INTMSK) & | |
511 | SPRD_EIC_DATA_MASK; | |
512 | break; | |
513 | default: | |
514 | dev_err(chip->parent, "Unsupported EIC type.\n"); | |
515 | return; | |
516 | } | |
517 | ||
518 | for_each_set_bit(n, ®, SPRD_EIC_PER_BANK_NR) { | |
519 | girq = irq_find_mapping(chip->irq.domain, | |
520 | bank * SPRD_EIC_PER_BANK_NR + n); | |
521 | ||
522 | generic_handle_irq(girq); | |
7bf0d7f6 | 523 | sprd_eic_toggle_trigger(chip, girq, n); |
25518e02 BW |
524 | } |
525 | } | |
526 | } | |
527 | ||
528 | static void sprd_eic_irq_handler(struct irq_desc *desc) | |
529 | { | |
530 | struct irq_chip *ic = irq_desc_get_chip(desc); | |
531 | struct gpio_chip *chip; | |
532 | enum sprd_eic_type type; | |
533 | ||
534 | chained_irq_enter(ic, desc); | |
535 | ||
536 | /* | |
537 | * Since the digital-chip EIC 4 sub-modules (debounce, latch, async | |
538 | * and sync) share one same interrupt line, we should iterate each | |
539 | * EIC module to check if there are EIC interrupts were triggered. | |
540 | */ | |
541 | for (type = SPRD_EIC_DEBOUNCE; type < SPRD_EIC_MAX; type++) { | |
542 | chip = gpiochip_find(&type, sprd_eic_match_chip_by_type); | |
543 | if (!chip) | |
544 | continue; | |
545 | ||
546 | sprd_eic_handle_one_type(chip); | |
547 | } | |
548 | ||
549 | chained_irq_exit(ic, desc); | |
550 | } | |
551 | ||
552 | static int sprd_eic_probe(struct platform_device *pdev) | |
553 | { | |
554 | const struct sprd_eic_variant_data *pdata; | |
555 | struct gpio_irq_chip *irq; | |
556 | struct sprd_eic *sprd_eic; | |
557 | struct resource *res; | |
558 | int ret, i; | |
559 | ||
560 | pdata = of_device_get_match_data(&pdev->dev); | |
561 | if (!pdata) { | |
562 | dev_err(&pdev->dev, "No matching driver data found.\n"); | |
563 | return -EINVAL; | |
564 | } | |
565 | ||
566 | sprd_eic = devm_kzalloc(&pdev->dev, sizeof(*sprd_eic), GFP_KERNEL); | |
567 | if (!sprd_eic) | |
568 | return -ENOMEM; | |
569 | ||
570 | spin_lock_init(&sprd_eic->lock); | |
571 | sprd_eic->type = pdata->type; | |
572 | ||
573 | sprd_eic->irq = platform_get_irq(pdev, 0); | |
574 | if (sprd_eic->irq < 0) { | |
575 | dev_err(&pdev->dev, "Failed to get EIC interrupt.\n"); | |
576 | return sprd_eic->irq; | |
577 | } | |
578 | ||
579 | for (i = 0; i < SPRD_EIC_MAX_BANK; i++) { | |
580 | /* | |
581 | * We can have maximum 3 banks EICs, and each EIC has | |
582 | * its own base address. But some platform maybe only | |
583 | * have one bank EIC, thus base[1] and base[2] can be | |
584 | * optional. | |
585 | */ | |
586 | res = platform_get_resource(pdev, IORESOURCE_MEM, i); | |
587 | if (!res) | |
588 | continue; | |
589 | ||
590 | sprd_eic->base[i] = devm_ioremap_resource(&pdev->dev, res); | |
591 | if (IS_ERR(sprd_eic->base[i])) | |
592 | return PTR_ERR(sprd_eic->base[i]); | |
593 | } | |
594 | ||
595 | sprd_eic->chip.label = sprd_eic_label_name[sprd_eic->type]; | |
596 | sprd_eic->chip.ngpio = pdata->num_eics; | |
597 | sprd_eic->chip.base = -1; | |
598 | sprd_eic->chip.parent = &pdev->dev; | |
599 | sprd_eic->chip.of_node = pdev->dev.of_node; | |
600 | sprd_eic->chip.direction_input = sprd_eic_direction_input; | |
601 | switch (sprd_eic->type) { | |
602 | case SPRD_EIC_DEBOUNCE: | |
603 | sprd_eic->chip.request = sprd_eic_request; | |
604 | sprd_eic->chip.free = sprd_eic_free; | |
605 | sprd_eic->chip.set_config = sprd_eic_set_config; | |
606 | sprd_eic->chip.set = sprd_eic_set; | |
607 | /* fall-through */ | |
608 | case SPRD_EIC_ASYNC: | |
609 | /* fall-through */ | |
610 | case SPRD_EIC_SYNC: | |
611 | sprd_eic->chip.get = sprd_eic_get; | |
612 | break; | |
613 | case SPRD_EIC_LATCH: | |
614 | /* fall-through */ | |
615 | default: | |
616 | break; | |
617 | } | |
618 | ||
619 | sprd_eic->intc.name = dev_name(&pdev->dev); | |
620 | sprd_eic->intc.irq_ack = sprd_eic_irq_ack; | |
621 | sprd_eic->intc.irq_mask = sprd_eic_irq_mask; | |
622 | sprd_eic->intc.irq_unmask = sprd_eic_irq_unmask; | |
623 | sprd_eic->intc.irq_set_type = sprd_eic_irq_set_type; | |
624 | sprd_eic->intc.flags = IRQCHIP_SKIP_SET_WAKE; | |
625 | ||
626 | irq = &sprd_eic->chip.irq; | |
627 | irq->chip = &sprd_eic->intc; | |
628 | irq->handler = handle_bad_irq; | |
629 | irq->default_type = IRQ_TYPE_NONE; | |
630 | irq->parent_handler = sprd_eic_irq_handler; | |
631 | irq->parent_handler_data = sprd_eic; | |
632 | irq->num_parents = 1; | |
633 | irq->parents = &sprd_eic->irq; | |
634 | ||
635 | ret = devm_gpiochip_add_data(&pdev->dev, &sprd_eic->chip, sprd_eic); | |
636 | if (ret < 0) { | |
637 | dev_err(&pdev->dev, "Could not register gpiochip %d.\n", ret); | |
638 | return ret; | |
639 | } | |
640 | ||
641 | platform_set_drvdata(pdev, sprd_eic); | |
642 | return 0; | |
643 | } | |
644 | ||
645 | static const struct of_device_id sprd_eic_of_match[] = { | |
646 | { | |
647 | .compatible = "sprd,sc9860-eic-debounce", | |
648 | .data = &sc9860_eic_dbnc_data, | |
649 | }, | |
650 | { | |
651 | .compatible = "sprd,sc9860-eic-latch", | |
652 | .data = &sc9860_eic_latch_data, | |
653 | }, | |
654 | { | |
655 | .compatible = "sprd,sc9860-eic-async", | |
656 | .data = &sc9860_eic_async_data, | |
657 | }, | |
658 | { | |
659 | .compatible = "sprd,sc9860-eic-sync", | |
660 | .data = &sc9860_eic_sync_data, | |
661 | }, | |
662 | { | |
663 | /* end of list */ | |
664 | } | |
665 | }; | |
666 | MODULE_DEVICE_TABLE(of, sprd_eic_of_match); | |
667 | ||
668 | static struct platform_driver sprd_eic_driver = { | |
669 | .probe = sprd_eic_probe, | |
670 | .driver = { | |
671 | .name = "sprd-eic", | |
672 | .of_match_table = sprd_eic_of_match, | |
673 | }, | |
674 | }; | |
675 | ||
676 | module_platform_driver(sprd_eic_driver); | |
677 | ||
678 | MODULE_DESCRIPTION("Spreadtrum EIC driver"); | |
679 | MODULE_LICENSE("GPL v2"); |