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fefe7b09 TP |
1 | /* |
2 | * GPIO driver for Marvell SoCs | |
3 | * | |
4 | * Copyright (C) 2012 Marvell | |
5 | * | |
6 | * Thomas Petazzoni <thomas.petazzoni@free-electrons.com> | |
7 | * Andrew Lunn <andrew@lunn.ch> | |
8 | * Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com> | |
9 | * | |
10 | * This file is licensed under the terms of the GNU General Public | |
11 | * License version 2. This program is licensed "as is" without any | |
12 | * warranty of any kind, whether express or implied. | |
13 | * | |
14 | * This driver is a fairly straightforward GPIO driver for the | |
15 | * complete family of Marvell EBU SoC platforms (Orion, Dove, | |
16 | * Kirkwood, Discovery, Armada 370/XP). The only complexity of this | |
17 | * driver is the different register layout that exists between the | |
18 | * non-SMP platforms (Orion, Dove, Kirkwood, Armada 370) and the SMP | |
19 | * platforms (MV78200 from the Discovery family and the Armada | |
20 | * XP). Therefore, this driver handles three variants of the GPIO | |
21 | * block: | |
22 | * - the basic variant, called "orion-gpio", with the simplest | |
23 | * register set. Used on Orion, Dove, Kirkwoord, Armada 370 and | |
24 | * non-SMP Discovery systems | |
25 | * - the mv78200 variant for MV78200 Discovery systems. This variant | |
26 | * turns the edge mask and level mask registers into CPU0 edge | |
27 | * mask/level mask registers, and adds CPU1 edge mask/level mask | |
28 | * registers. | |
29 | * - the armadaxp variant for Armada XP systems. This variant keeps | |
30 | * the normal cause/edge mask/level mask registers when the global | |
31 | * interrupts are used, but adds per-CPU cause/edge mask/level mask | |
32 | * registers n a separate memory area for the per-CPU GPIO | |
33 | * interrupts. | |
34 | */ | |
35 | ||
36 | #include <linux/module.h> | |
37 | #include <linux/gpio.h> | |
38 | #include <linux/irq.h> | |
39 | #include <linux/slab.h> | |
40 | #include <linux/irqdomain.h> | |
41 | #include <linux/io.h> | |
42 | #include <linux/of_irq.h> | |
43 | #include <linux/of_device.h> | |
44 | #include <linux/platform_device.h> | |
45 | #include <linux/pinctrl/consumer.h> | |
46 | ||
47 | /* | |
48 | * GPIO unit register offsets. | |
49 | */ | |
50 | #define GPIO_OUT_OFF 0x0000 | |
51 | #define GPIO_IO_CONF_OFF 0x0004 | |
52 | #define GPIO_BLINK_EN_OFF 0x0008 | |
53 | #define GPIO_IN_POL_OFF 0x000c | |
54 | #define GPIO_DATA_IN_OFF 0x0010 | |
55 | #define GPIO_EDGE_CAUSE_OFF 0x0014 | |
56 | #define GPIO_EDGE_MASK_OFF 0x0018 | |
57 | #define GPIO_LEVEL_MASK_OFF 0x001c | |
58 | ||
59 | /* The MV78200 has per-CPU registers for edge mask and level mask */ | |
60 | #define GPIO_EDGE_MASK_MV78200_OFF(cpu) ((cpu) ? 0x30 : 0x18) | |
61 | #define GPIO_LEVEL_MASK_MV78200_OFF(cpu) ((cpu) ? 0x34 : 0x1C) | |
62 | ||
63 | /* The Armada XP has per-CPU registers for interrupt cause, interrupt | |
64 | * mask and interrupt level mask. Those are relative to the | |
65 | * percpu_membase. */ | |
66 | #define GPIO_EDGE_CAUSE_ARMADAXP_OFF(cpu) ((cpu) * 0x4) | |
67 | #define GPIO_EDGE_MASK_ARMADAXP_OFF(cpu) (0x10 + (cpu) * 0x4) | |
68 | #define GPIO_LEVEL_MASK_ARMADAXP_OFF(cpu) (0x20 + (cpu) * 0x4) | |
69 | ||
70 | #define MVEBU_GPIO_SOC_VARIANT_ORION 0x1 | |
71 | #define MVEBU_GPIO_SOC_VARIANT_MV78200 0x2 | |
72 | #define MVEBU_GPIO_SOC_VARIANT_ARMADAXP 0x3 | |
73 | ||
74 | #define MVEBU_MAX_GPIO_PER_BANK 32 | |
75 | ||
76 | struct mvebu_gpio_chip { | |
77 | struct gpio_chip chip; | |
78 | spinlock_t lock; | |
79 | void __iomem *membase; | |
80 | void __iomem *percpu_membase; | |
81 | unsigned int irqbase; | |
82 | struct irq_domain *domain; | |
83 | int soc_variant; | |
84 | }; | |
85 | ||
86 | /* | |
87 | * Functions returning addresses of individual registers for a given | |
88 | * GPIO controller. | |
89 | */ | |
90 | static inline void __iomem *mvebu_gpioreg_out(struct mvebu_gpio_chip *mvchip) | |
91 | { | |
92 | return mvchip->membase + GPIO_OUT_OFF; | |
93 | } | |
94 | ||
95 | static inline void __iomem *mvebu_gpioreg_io_conf(struct mvebu_gpio_chip *mvchip) | |
96 | { | |
97 | return mvchip->membase + GPIO_IO_CONF_OFF; | |
98 | } | |
99 | ||
100 | static inline void __iomem *mvebu_gpioreg_in_pol(struct mvebu_gpio_chip *mvchip) | |
101 | { | |
102 | return mvchip->membase + GPIO_IN_POL_OFF; | |
103 | } | |
104 | ||
105 | static inline void __iomem *mvebu_gpioreg_data_in(struct mvebu_gpio_chip *mvchip) | |
106 | { | |
107 | return mvchip->membase + GPIO_DATA_IN_OFF; | |
108 | } | |
109 | ||
110 | static inline void __iomem *mvebu_gpioreg_edge_cause(struct mvebu_gpio_chip *mvchip) | |
111 | { | |
112 | int cpu; | |
113 | ||
114 | switch(mvchip->soc_variant) { | |
115 | case MVEBU_GPIO_SOC_VARIANT_ORION: | |
116 | case MVEBU_GPIO_SOC_VARIANT_MV78200: | |
117 | return mvchip->membase + GPIO_EDGE_CAUSE_OFF; | |
118 | case MVEBU_GPIO_SOC_VARIANT_ARMADAXP: | |
119 | cpu = smp_processor_id(); | |
120 | return mvchip->percpu_membase + GPIO_EDGE_CAUSE_ARMADAXP_OFF(cpu); | |
121 | default: | |
122 | BUG(); | |
123 | } | |
124 | } | |
125 | ||
126 | static inline void __iomem *mvebu_gpioreg_edge_mask(struct mvebu_gpio_chip *mvchip) | |
127 | { | |
128 | int cpu; | |
129 | ||
130 | switch(mvchip->soc_variant) { | |
131 | case MVEBU_GPIO_SOC_VARIANT_ORION: | |
132 | return mvchip->membase + GPIO_EDGE_MASK_OFF; | |
133 | case MVEBU_GPIO_SOC_VARIANT_MV78200: | |
134 | cpu = smp_processor_id(); | |
135 | return mvchip->membase + GPIO_EDGE_MASK_MV78200_OFF(cpu); | |
136 | case MVEBU_GPIO_SOC_VARIANT_ARMADAXP: | |
137 | cpu = smp_processor_id(); | |
138 | return mvchip->percpu_membase + GPIO_EDGE_MASK_ARMADAXP_OFF(cpu); | |
139 | default: | |
140 | BUG(); | |
141 | } | |
142 | } | |
143 | ||
144 | static void __iomem *mvebu_gpioreg_level_mask(struct mvebu_gpio_chip *mvchip) | |
145 | { | |
146 | int cpu; | |
147 | ||
148 | switch(mvchip->soc_variant) { | |
149 | case MVEBU_GPIO_SOC_VARIANT_ORION: | |
150 | return mvchip->membase + GPIO_LEVEL_MASK_OFF; | |
151 | case MVEBU_GPIO_SOC_VARIANT_MV78200: | |
152 | cpu = smp_processor_id(); | |
153 | return mvchip->membase + GPIO_LEVEL_MASK_MV78200_OFF(cpu); | |
154 | case MVEBU_GPIO_SOC_VARIANT_ARMADAXP: | |
155 | cpu = smp_processor_id(); | |
156 | return mvchip->percpu_membase + GPIO_LEVEL_MASK_ARMADAXP_OFF(cpu); | |
157 | default: | |
158 | BUG(); | |
159 | } | |
160 | } | |
161 | ||
162 | /* | |
163 | * Functions implementing the gpio_chip methods | |
164 | */ | |
165 | ||
166 | int mvebu_gpio_request(struct gpio_chip *chip, unsigned pin) | |
167 | { | |
168 | return pinctrl_request_gpio(chip->base + pin); | |
169 | } | |
170 | ||
171 | void mvebu_gpio_free(struct gpio_chip *chip, unsigned pin) | |
172 | { | |
173 | pinctrl_free_gpio(chip->base + pin); | |
174 | } | |
175 | ||
176 | static void mvebu_gpio_set(struct gpio_chip *chip, unsigned pin, int value) | |
177 | { | |
178 | struct mvebu_gpio_chip *mvchip = | |
179 | container_of(chip, struct mvebu_gpio_chip, chip); | |
180 | unsigned long flags; | |
181 | u32 u; | |
182 | ||
183 | spin_lock_irqsave(&mvchip->lock, flags); | |
184 | u = readl_relaxed(mvebu_gpioreg_out(mvchip)); | |
185 | if (value) | |
186 | u |= 1 << pin; | |
187 | else | |
188 | u &= ~(1 << pin); | |
189 | writel_relaxed(u, mvebu_gpioreg_out(mvchip)); | |
190 | spin_unlock_irqrestore(&mvchip->lock, flags); | |
191 | } | |
192 | ||
193 | static int mvebu_gpio_get(struct gpio_chip *chip, unsigned pin) | |
194 | { | |
195 | struct mvebu_gpio_chip *mvchip = | |
196 | container_of(chip, struct mvebu_gpio_chip, chip); | |
197 | u32 u; | |
198 | ||
199 | if (readl_relaxed(mvebu_gpioreg_io_conf(mvchip)) & (1 << pin)) { | |
200 | u = readl_relaxed(mvebu_gpioreg_data_in(mvchip)) ^ | |
201 | readl_relaxed(mvebu_gpioreg_in_pol(mvchip)); | |
202 | } else { | |
203 | u = readl_relaxed(mvebu_gpioreg_out(mvchip)); | |
204 | } | |
205 | ||
206 | return (u >> pin) & 1; | |
207 | } | |
208 | ||
209 | static int mvebu_gpio_direction_input(struct gpio_chip *chip, unsigned pin) | |
210 | { | |
211 | struct mvebu_gpio_chip *mvchip = | |
212 | container_of(chip, struct mvebu_gpio_chip, chip); | |
213 | unsigned long flags; | |
214 | int ret; | |
215 | u32 u; | |
216 | ||
217 | /* Check with the pinctrl driver whether this pin is usable as | |
218 | * an input GPIO */ | |
219 | ret = pinctrl_gpio_direction_input(chip->base + pin); | |
220 | if (ret) | |
221 | return ret; | |
222 | ||
223 | spin_lock_irqsave(&mvchip->lock, flags); | |
224 | u = readl_relaxed(mvebu_gpioreg_io_conf(mvchip)); | |
225 | u |= 1 << pin; | |
226 | writel_relaxed(u, mvebu_gpioreg_io_conf(mvchip)); | |
227 | spin_unlock_irqrestore(&mvchip->lock, flags); | |
228 | ||
229 | return 0; | |
230 | } | |
231 | ||
232 | static int mvebu_gpio_direction_output(struct gpio_chip *chip, unsigned pin, | |
233 | int value) | |
234 | { | |
235 | struct mvebu_gpio_chip *mvchip = | |
236 | container_of(chip, struct mvebu_gpio_chip, chip); | |
237 | unsigned long flags; | |
238 | int ret; | |
239 | u32 u; | |
240 | ||
241 | /* Check with the pinctrl driver whether this pin is usable as | |
242 | * an output GPIO */ | |
243 | ret = pinctrl_gpio_direction_output(chip->base + pin); | |
244 | if (ret) | |
245 | return ret; | |
246 | ||
247 | spin_lock_irqsave(&mvchip->lock, flags); | |
248 | u = readl_relaxed(mvebu_gpioreg_io_conf(mvchip)); | |
249 | u &= ~(1 << pin); | |
250 | writel_relaxed(u, mvebu_gpioreg_io_conf(mvchip)); | |
251 | spin_unlock_irqrestore(&mvchip->lock, flags); | |
252 | ||
253 | return 0; | |
254 | } | |
255 | ||
256 | static int mvebu_gpio_to_irq(struct gpio_chip *chip, unsigned pin) | |
257 | { | |
258 | struct mvebu_gpio_chip *mvchip = | |
259 | container_of(chip, struct mvebu_gpio_chip, chip); | |
260 | return irq_create_mapping(mvchip->domain, pin); | |
261 | } | |
262 | ||
263 | /* | |
264 | * Functions implementing the irq_chip methods | |
265 | */ | |
266 | static void mvebu_gpio_irq_ack(struct irq_data *d) | |
267 | { | |
268 | struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); | |
269 | struct mvebu_gpio_chip *mvchip = gc->private; | |
270 | u32 mask = ~(1 << (d->irq - gc->irq_base)); | |
271 | ||
272 | irq_gc_lock(gc); | |
273 | writel_relaxed(mask, mvebu_gpioreg_edge_cause(mvchip)); | |
274 | irq_gc_unlock(gc); | |
275 | } | |
276 | ||
277 | static void mvebu_gpio_edge_irq_mask(struct irq_data *d) | |
278 | { | |
279 | struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); | |
280 | struct mvebu_gpio_chip *mvchip = gc->private; | |
281 | u32 mask = 1 << (d->irq - gc->irq_base); | |
282 | ||
283 | irq_gc_lock(gc); | |
284 | gc->mask_cache &= ~mask; | |
285 | writel_relaxed(gc->mask_cache, mvebu_gpioreg_edge_mask(mvchip)); | |
286 | irq_gc_unlock(gc); | |
287 | } | |
288 | ||
289 | static void mvebu_gpio_edge_irq_unmask(struct irq_data *d) | |
290 | { | |
291 | struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); | |
292 | struct mvebu_gpio_chip *mvchip = gc->private; | |
293 | u32 mask = 1 << (d->irq - gc->irq_base); | |
294 | ||
295 | irq_gc_lock(gc); | |
296 | gc->mask_cache |= mask; | |
297 | writel_relaxed(gc->mask_cache, mvebu_gpioreg_edge_mask(mvchip)); | |
298 | irq_gc_unlock(gc); | |
299 | } | |
300 | ||
301 | static void mvebu_gpio_level_irq_mask(struct irq_data *d) | |
302 | { | |
303 | struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); | |
304 | struct mvebu_gpio_chip *mvchip = gc->private; | |
305 | u32 mask = 1 << (d->irq - gc->irq_base); | |
306 | ||
307 | irq_gc_lock(gc); | |
308 | gc->mask_cache &= ~mask; | |
309 | writel_relaxed(gc->mask_cache, mvebu_gpioreg_level_mask(mvchip)); | |
310 | irq_gc_unlock(gc); | |
311 | } | |
312 | ||
313 | static void mvebu_gpio_level_irq_unmask(struct irq_data *d) | |
314 | { | |
315 | struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); | |
316 | struct mvebu_gpio_chip *mvchip = gc->private; | |
317 | u32 mask = 1 << (d->irq - gc->irq_base); | |
318 | ||
319 | irq_gc_lock(gc); | |
320 | gc->mask_cache |= mask; | |
321 | writel_relaxed(gc->mask_cache, mvebu_gpioreg_level_mask(mvchip)); | |
322 | irq_gc_unlock(gc); | |
323 | } | |
324 | ||
325 | /***************************************************************************** | |
326 | * MVEBU GPIO IRQ | |
327 | * | |
328 | * GPIO_IN_POL register controls whether GPIO_DATA_IN will hold the same | |
329 | * value of the line or the opposite value. | |
330 | * | |
331 | * Level IRQ handlers: DATA_IN is used directly as cause register. | |
332 | * Interrupt are masked by LEVEL_MASK registers. | |
333 | * Edge IRQ handlers: Change in DATA_IN are latched in EDGE_CAUSE. | |
334 | * Interrupt are masked by EDGE_MASK registers. | |
335 | * Both-edge handlers: Similar to regular Edge handlers, but also swaps | |
336 | * the polarity to catch the next line transaction. | |
337 | * This is a race condition that might not perfectly | |
338 | * work on some use cases. | |
339 | * | |
340 | * Every eight GPIO lines are grouped (OR'ed) before going up to main | |
341 | * cause register. | |
342 | * | |
343 | * EDGE cause mask | |
344 | * data-in /--------| |-----| |----\ | |
345 | * -----| |----- ---- to main cause reg | |
346 | * X \----------------| |----/ | |
347 | * polarity LEVEL mask | |
348 | * | |
349 | ****************************************************************************/ | |
350 | ||
351 | static int mvebu_gpio_irq_set_type(struct irq_data *d, unsigned int type) | |
352 | { | |
353 | struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); | |
354 | struct irq_chip_type *ct = irq_data_get_chip_type(d); | |
355 | struct mvebu_gpio_chip *mvchip = gc->private; | |
356 | int pin; | |
357 | u32 u; | |
358 | ||
359 | pin = d->hwirq; | |
360 | ||
361 | u = readl_relaxed(mvebu_gpioreg_io_conf(mvchip)) & (1 << pin); | |
362 | if (!u) { | |
363 | return -EINVAL; | |
364 | } | |
365 | ||
366 | type &= IRQ_TYPE_SENSE_MASK; | |
367 | if (type == IRQ_TYPE_NONE) | |
368 | return -EINVAL; | |
369 | ||
370 | /* Check if we need to change chip and handler */ | |
371 | if (!(ct->type & type)) | |
372 | if (irq_setup_alt_chip(d, type)) | |
373 | return -EINVAL; | |
374 | ||
375 | /* | |
376 | * Configure interrupt polarity. | |
377 | */ | |
378 | switch(type) { | |
379 | case IRQ_TYPE_EDGE_RISING: | |
380 | case IRQ_TYPE_LEVEL_HIGH: | |
381 | u = readl_relaxed(mvebu_gpioreg_in_pol(mvchip)); | |
382 | u &= ~(1 << pin); | |
383 | writel_relaxed(u, mvebu_gpioreg_in_pol(mvchip)); | |
7cf8c9f7 | 384 | break; |
fefe7b09 TP |
385 | case IRQ_TYPE_EDGE_FALLING: |
386 | case IRQ_TYPE_LEVEL_LOW: | |
387 | u = readl_relaxed(mvebu_gpioreg_in_pol(mvchip)); | |
388 | u |= 1 << pin; | |
389 | writel_relaxed(u, mvebu_gpioreg_in_pol(mvchip)); | |
7cf8c9f7 | 390 | break; |
fefe7b09 TP |
391 | case IRQ_TYPE_EDGE_BOTH: { |
392 | u32 v; | |
393 | ||
394 | v = readl_relaxed(mvebu_gpioreg_in_pol(mvchip)) ^ | |
395 | readl_relaxed(mvebu_gpioreg_data_in(mvchip)); | |
396 | ||
397 | /* | |
398 | * set initial polarity based on current input level | |
399 | */ | |
400 | u = readl_relaxed(mvebu_gpioreg_in_pol(mvchip)); | |
401 | if (v & (1 << pin)) | |
402 | u |= 1 << pin; /* falling */ | |
403 | else | |
404 | u &= ~(1 << pin); /* rising */ | |
405 | writel_relaxed(u, mvebu_gpioreg_in_pol(mvchip)); | |
7cf8c9f7 | 406 | break; |
fefe7b09 TP |
407 | } |
408 | } | |
409 | return 0; | |
410 | } | |
411 | ||
412 | static void mvebu_gpio_irq_handler(unsigned int irq, struct irq_desc *desc) | |
413 | { | |
414 | struct mvebu_gpio_chip *mvchip = irq_get_handler_data(irq); | |
415 | u32 cause, type; | |
416 | int i; | |
417 | ||
418 | if (mvchip == NULL) | |
419 | return; | |
420 | ||
421 | cause = readl_relaxed(mvebu_gpioreg_data_in(mvchip)) & | |
422 | readl_relaxed(mvebu_gpioreg_level_mask(mvchip)); | |
423 | cause |= readl_relaxed(mvebu_gpioreg_edge_cause(mvchip)) & | |
424 | readl_relaxed(mvebu_gpioreg_edge_mask(mvchip)); | |
425 | ||
426 | for (i = 0; i < mvchip->chip.ngpio; i++) { | |
427 | int irq; | |
428 | ||
429 | irq = mvchip->irqbase + i; | |
430 | ||
431 | if (!(cause & (1 << i))) | |
432 | continue; | |
433 | ||
434 | type = irqd_get_trigger_type(irq_get_irq_data(irq)); | |
435 | if ((type & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_BOTH) { | |
436 | /* Swap polarity (race with GPIO line) */ | |
437 | u32 polarity; | |
438 | ||
439 | polarity = readl_relaxed(mvebu_gpioreg_in_pol(mvchip)); | |
440 | polarity ^= 1 << i; | |
441 | writel_relaxed(polarity, mvebu_gpioreg_in_pol(mvchip)); | |
442 | } | |
443 | generic_handle_irq(irq); | |
444 | } | |
445 | } | |
446 | ||
447 | static struct platform_device_id mvebu_gpio_ids[] = { | |
448 | { | |
449 | .name = "orion-gpio", | |
450 | }, { | |
451 | .name = "mv78200-gpio", | |
452 | }, { | |
453 | .name = "armadaxp-gpio", | |
454 | }, { | |
455 | /* sentinel */ | |
456 | }, | |
457 | }; | |
458 | MODULE_DEVICE_TABLE(platform, mvebu_gpio_ids); | |
459 | ||
460 | static struct of_device_id mvebu_gpio_of_match[] __devinitdata = { | |
461 | { | |
462 | .compatible = "marvell,orion-gpio", | |
463 | .data = (void*) MVEBU_GPIO_SOC_VARIANT_ORION, | |
464 | }, | |
465 | { | |
466 | .compatible = "marvell,mv78200-gpio", | |
467 | .data = (void*) MVEBU_GPIO_SOC_VARIANT_MV78200, | |
468 | }, | |
469 | { | |
470 | .compatible = "marvell,armadaxp-gpio", | |
471 | .data = (void*) MVEBU_GPIO_SOC_VARIANT_ARMADAXP, | |
472 | }, | |
473 | { | |
474 | /* sentinel */ | |
475 | }, | |
476 | }; | |
477 | MODULE_DEVICE_TABLE(of, mvebu_gpio_of_match); | |
478 | ||
479 | static int __devinit mvebu_gpio_probe(struct platform_device *pdev) | |
480 | { | |
481 | struct mvebu_gpio_chip *mvchip; | |
482 | const struct of_device_id *match; | |
483 | struct device_node *np = pdev->dev.of_node; | |
484 | struct resource *res; | |
485 | struct irq_chip_generic *gc; | |
486 | struct irq_chip_type *ct; | |
487 | unsigned int ngpios; | |
488 | int soc_variant; | |
489 | int i, cpu, id; | |
490 | ||
491 | match = of_match_device(mvebu_gpio_of_match, &pdev->dev); | |
492 | if (match) | |
493 | soc_variant = (int) match->data; | |
494 | else | |
495 | soc_variant = MVEBU_GPIO_SOC_VARIANT_ORION; | |
496 | ||
497 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
498 | if (! res) { | |
499 | dev_err(&pdev->dev, "Cannot get memory resource\n"); | |
500 | return -ENODEV; | |
501 | } | |
502 | ||
503 | mvchip = devm_kzalloc(&pdev->dev, sizeof(struct mvebu_gpio_chip), GFP_KERNEL); | |
504 | if (! mvchip){ | |
505 | dev_err(&pdev->dev, "Cannot allocate memory\n"); | |
506 | return -ENOMEM; | |
507 | } | |
508 | ||
509 | if (of_property_read_u32(pdev->dev.of_node, "ngpios", &ngpios)) { | |
510 | dev_err(&pdev->dev, "Missing ngpios OF property\n"); | |
511 | return -ENODEV; | |
512 | } | |
513 | ||
514 | id = of_alias_get_id(pdev->dev.of_node, "gpio"); | |
515 | if (id < 0) { | |
516 | dev_err(&pdev->dev, "Couldn't get OF id\n"); | |
517 | return id; | |
518 | } | |
519 | ||
520 | mvchip->soc_variant = soc_variant; | |
521 | mvchip->chip.label = dev_name(&pdev->dev); | |
522 | mvchip->chip.dev = &pdev->dev; | |
523 | mvchip->chip.request = mvebu_gpio_request; | |
524 | mvchip->chip.direction_input = mvebu_gpio_direction_input; | |
525 | mvchip->chip.get = mvebu_gpio_get; | |
526 | mvchip->chip.direction_output = mvebu_gpio_direction_output; | |
527 | mvchip->chip.set = mvebu_gpio_set; | |
528 | mvchip->chip.to_irq = mvebu_gpio_to_irq; | |
529 | mvchip->chip.base = id * MVEBU_MAX_GPIO_PER_BANK; | |
530 | mvchip->chip.ngpio = ngpios; | |
531 | mvchip->chip.can_sleep = 0; | |
532 | #ifdef CONFIG_OF | |
533 | mvchip->chip.of_node = np; | |
534 | #endif | |
535 | ||
536 | spin_lock_init(&mvchip->lock); | |
537 | mvchip->membase = devm_request_and_ioremap(&pdev->dev, res); | |
538 | if (! mvchip->membase) { | |
539 | dev_err(&pdev->dev, "Cannot ioremap\n"); | |
540 | kfree(mvchip->chip.label); | |
541 | return -ENOMEM; | |
542 | } | |
543 | ||
544 | /* The Armada XP has a second range of registers for the | |
545 | * per-CPU registers */ | |
546 | if (soc_variant == MVEBU_GPIO_SOC_VARIANT_ARMADAXP) { | |
547 | res = platform_get_resource(pdev, IORESOURCE_MEM, 1); | |
548 | if (! res) { | |
549 | dev_err(&pdev->dev, "Cannot get memory resource\n"); | |
550 | kfree(mvchip->chip.label); | |
551 | return -ENODEV; | |
552 | } | |
553 | ||
554 | mvchip->percpu_membase = devm_request_and_ioremap(&pdev->dev, res); | |
555 | if (! mvchip->percpu_membase) { | |
556 | dev_err(&pdev->dev, "Cannot ioremap\n"); | |
557 | kfree(mvchip->chip.label); | |
558 | return -ENOMEM; | |
559 | } | |
560 | } | |
561 | ||
562 | /* | |
563 | * Mask and clear GPIO interrupts. | |
564 | */ | |
565 | switch(soc_variant) { | |
566 | case MVEBU_GPIO_SOC_VARIANT_ORION: | |
567 | writel_relaxed(0, mvchip->membase + GPIO_EDGE_CAUSE_OFF); | |
568 | writel_relaxed(0, mvchip->membase + GPIO_EDGE_MASK_OFF); | |
569 | writel_relaxed(0, mvchip->membase + GPIO_LEVEL_MASK_OFF); | |
570 | break; | |
571 | case MVEBU_GPIO_SOC_VARIANT_MV78200: | |
572 | writel_relaxed(0, mvchip->membase + GPIO_EDGE_CAUSE_OFF); | |
573 | for (cpu = 0; cpu < 2; cpu++) { | |
574 | writel_relaxed(0, mvchip->membase + | |
575 | GPIO_EDGE_MASK_MV78200_OFF(cpu)); | |
576 | writel_relaxed(0, mvchip->membase + | |
577 | GPIO_LEVEL_MASK_MV78200_OFF(cpu)); | |
578 | } | |
579 | break; | |
580 | case MVEBU_GPIO_SOC_VARIANT_ARMADAXP: | |
581 | writel_relaxed(0, mvchip->membase + GPIO_EDGE_CAUSE_OFF); | |
582 | writel_relaxed(0, mvchip->membase + GPIO_EDGE_MASK_OFF); | |
583 | writel_relaxed(0, mvchip->membase + GPIO_LEVEL_MASK_OFF); | |
584 | for (cpu = 0; cpu < 4; cpu++) { | |
585 | writel_relaxed(0, mvchip->percpu_membase + | |
586 | GPIO_EDGE_CAUSE_ARMADAXP_OFF(cpu)); | |
587 | writel_relaxed(0, mvchip->percpu_membase + | |
588 | GPIO_EDGE_MASK_ARMADAXP_OFF(cpu)); | |
589 | writel_relaxed(0, mvchip->percpu_membase + | |
590 | GPIO_LEVEL_MASK_ARMADAXP_OFF(cpu)); | |
591 | } | |
592 | break; | |
593 | default: | |
594 | BUG(); | |
595 | } | |
596 | ||
597 | gpiochip_add(&mvchip->chip); | |
598 | ||
599 | /* Some gpio controllers do not provide irq support */ | |
600 | if (!of_irq_count(np)) | |
601 | return 0; | |
602 | ||
603 | /* Setup the interrupt handlers. Each chip can have up to 4 | |
604 | * interrupt handlers, with each handler dealing with 8 GPIO | |
605 | * pins. */ | |
606 | for (i = 0; i < 4; i++) { | |
607 | int irq; | |
608 | irq = platform_get_irq(pdev, i); | |
609 | if (irq < 0) | |
610 | continue; | |
611 | irq_set_handler_data(irq, mvchip); | |
612 | irq_set_chained_handler(irq, mvebu_gpio_irq_handler); | |
613 | } | |
614 | ||
615 | mvchip->irqbase = irq_alloc_descs(-1, 0, ngpios, -1); | |
616 | if (mvchip->irqbase < 0) { | |
617 | dev_err(&pdev->dev, "no irqs\n"); | |
618 | kfree(mvchip->chip.label); | |
619 | return -ENOMEM; | |
620 | } | |
621 | ||
622 | gc = irq_alloc_generic_chip("mvebu_gpio_irq", 2, mvchip->irqbase, | |
623 | mvchip->membase, handle_level_irq); | |
624 | if (! gc) { | |
625 | dev_err(&pdev->dev, "Cannot allocate generic irq_chip\n"); | |
626 | kfree(mvchip->chip.label); | |
627 | return -ENOMEM; | |
628 | } | |
629 | ||
630 | gc->private = mvchip; | |
631 | ct = &gc->chip_types[0]; | |
632 | ct->type = IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW; | |
633 | ct->chip.irq_mask = mvebu_gpio_level_irq_mask; | |
634 | ct->chip.irq_unmask = mvebu_gpio_level_irq_unmask; | |
635 | ct->chip.irq_set_type = mvebu_gpio_irq_set_type; | |
636 | ct->chip.name = mvchip->chip.label; | |
637 | ||
638 | ct = &gc->chip_types[1]; | |
639 | ct->type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING; | |
640 | ct->chip.irq_ack = mvebu_gpio_irq_ack; | |
641 | ct->chip.irq_mask = mvebu_gpio_edge_irq_mask; | |
642 | ct->chip.irq_unmask = mvebu_gpio_edge_irq_unmask; | |
643 | ct->chip.irq_set_type = mvebu_gpio_irq_set_type; | |
644 | ct->handler = handle_edge_irq; | |
645 | ct->chip.name = mvchip->chip.label; | |
646 | ||
647 | irq_setup_generic_chip(gc, IRQ_MSK(ngpios), IRQ_GC_INIT_MASK_CACHE, | |
648 | IRQ_NOREQUEST, IRQ_LEVEL | IRQ_NOPROBE); | |
649 | ||
650 | /* Setup irq domain on top of the generic chip. */ | |
651 | mvchip->domain = irq_domain_add_legacy(np, mvchip->chip.ngpio, | |
652 | mvchip->irqbase, 0, | |
653 | &irq_domain_simple_ops, | |
654 | mvchip); | |
655 | if (!mvchip->domain) { | |
656 | dev_err(&pdev->dev, "couldn't allocate irq domain %s (DT).\n", | |
657 | mvchip->chip.label); | |
658 | irq_remove_generic_chip(gc, IRQ_MSK(ngpios), IRQ_NOREQUEST, | |
659 | IRQ_LEVEL | IRQ_NOPROBE); | |
660 | kfree(gc); | |
661 | kfree(mvchip->chip.label); | |
662 | return -ENODEV; | |
663 | } | |
664 | ||
665 | return 0; | |
666 | } | |
667 | ||
668 | static struct platform_driver mvebu_gpio_driver = { | |
669 | .driver = { | |
670 | .name = "mvebu-gpio", | |
671 | .owner = THIS_MODULE, | |
672 | .of_match_table = mvebu_gpio_of_match, | |
673 | }, | |
674 | .probe = mvebu_gpio_probe, | |
675 | .id_table = mvebu_gpio_ids, | |
676 | }; | |
677 | ||
678 | static int __init mvebu_gpio_init(void) | |
679 | { | |
680 | return platform_driver_register(&mvebu_gpio_driver); | |
681 | } | |
682 | postcore_initcall(mvebu_gpio_init); |