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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid
[deliverable/linux.git] / drivers / gpio / gpio-mvebu.c
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/err.h>
37 #include <linux/init.h>
38 #include <linux/gpio.h>
39 #include <linux/irq.h>
40 #include <linux/slab.h>
41 #include <linux/irqdomain.h>
42 #include <linux/io.h>
43 #include <linux/of_irq.h>
44 #include <linux/of_device.h>
45 #include <linux/clk.h>
46 #include <linux/pinctrl/consumer.h>
47 #include <linux/irqchip/chained_irq.h>
48
49 /*
50 * GPIO unit register offsets.
51 */
52 #define GPIO_OUT_OFF 0x0000
53 #define GPIO_IO_CONF_OFF 0x0004
54 #define GPIO_BLINK_EN_OFF 0x0008
55 #define GPIO_IN_POL_OFF 0x000c
56 #define GPIO_DATA_IN_OFF 0x0010
57 #define GPIO_EDGE_CAUSE_OFF 0x0014
58 #define GPIO_EDGE_MASK_OFF 0x0018
59 #define GPIO_LEVEL_MASK_OFF 0x001c
60
61 /* The MV78200 has per-CPU registers for edge mask and level mask */
62 #define GPIO_EDGE_MASK_MV78200_OFF(cpu) ((cpu) ? 0x30 : 0x18)
63 #define GPIO_LEVEL_MASK_MV78200_OFF(cpu) ((cpu) ? 0x34 : 0x1C)
64
65 /* The Armada XP has per-CPU registers for interrupt cause, interrupt
66 * mask and interrupt level mask. Those are relative to the
67 * percpu_membase. */
68 #define GPIO_EDGE_CAUSE_ARMADAXP_OFF(cpu) ((cpu) * 0x4)
69 #define GPIO_EDGE_MASK_ARMADAXP_OFF(cpu) (0x10 + (cpu) * 0x4)
70 #define GPIO_LEVEL_MASK_ARMADAXP_OFF(cpu) (0x20 + (cpu) * 0x4)
71
72 #define MVEBU_GPIO_SOC_VARIANT_ORION 0x1
73 #define MVEBU_GPIO_SOC_VARIANT_MV78200 0x2
74 #define MVEBU_GPIO_SOC_VARIANT_ARMADAXP 0x3
75
76 #define MVEBU_MAX_GPIO_PER_BANK 32
77
78 struct mvebu_gpio_chip {
79 struct gpio_chip chip;
80 spinlock_t lock;
81 void __iomem *membase;
82 void __iomem *percpu_membase;
83 int irqbase;
84 struct irq_domain *domain;
85 int soc_variant;
86
87 /* Used to preserve GPIO registers across suspend/resume */
88 u32 out_reg;
89 u32 io_conf_reg;
90 u32 blink_en_reg;
91 u32 in_pol_reg;
92 u32 edge_mask_regs[4];
93 u32 level_mask_regs[4];
94 };
95
96 /*
97 * Functions returning addresses of individual registers for a given
98 * GPIO controller.
99 */
100 static inline void __iomem *mvebu_gpioreg_out(struct mvebu_gpio_chip *mvchip)
101 {
102 return mvchip->membase + GPIO_OUT_OFF;
103 }
104
105 static inline void __iomem *mvebu_gpioreg_blink(struct mvebu_gpio_chip *mvchip)
106 {
107 return mvchip->membase + GPIO_BLINK_EN_OFF;
108 }
109
110 static inline void __iomem *
111 mvebu_gpioreg_io_conf(struct mvebu_gpio_chip *mvchip)
112 {
113 return mvchip->membase + GPIO_IO_CONF_OFF;
114 }
115
116 static inline void __iomem *mvebu_gpioreg_in_pol(struct mvebu_gpio_chip *mvchip)
117 {
118 return mvchip->membase + GPIO_IN_POL_OFF;
119 }
120
121 static inline void __iomem *
122 mvebu_gpioreg_data_in(struct mvebu_gpio_chip *mvchip)
123 {
124 return mvchip->membase + GPIO_DATA_IN_OFF;
125 }
126
127 static inline void __iomem *
128 mvebu_gpioreg_edge_cause(struct mvebu_gpio_chip *mvchip)
129 {
130 int cpu;
131
132 switch (mvchip->soc_variant) {
133 case MVEBU_GPIO_SOC_VARIANT_ORION:
134 case MVEBU_GPIO_SOC_VARIANT_MV78200:
135 return mvchip->membase + GPIO_EDGE_CAUSE_OFF;
136 case MVEBU_GPIO_SOC_VARIANT_ARMADAXP:
137 cpu = smp_processor_id();
138 return mvchip->percpu_membase +
139 GPIO_EDGE_CAUSE_ARMADAXP_OFF(cpu);
140 default:
141 BUG();
142 }
143 }
144
145 static inline void __iomem *
146 mvebu_gpioreg_edge_mask(struct mvebu_gpio_chip *mvchip)
147 {
148 int cpu;
149
150 switch (mvchip->soc_variant) {
151 case MVEBU_GPIO_SOC_VARIANT_ORION:
152 return mvchip->membase + GPIO_EDGE_MASK_OFF;
153 case MVEBU_GPIO_SOC_VARIANT_MV78200:
154 cpu = smp_processor_id();
155 return mvchip->membase + GPIO_EDGE_MASK_MV78200_OFF(cpu);
156 case MVEBU_GPIO_SOC_VARIANT_ARMADAXP:
157 cpu = smp_processor_id();
158 return mvchip->percpu_membase +
159 GPIO_EDGE_MASK_ARMADAXP_OFF(cpu);
160 default:
161 BUG();
162 }
163 }
164
165 static void __iomem *mvebu_gpioreg_level_mask(struct mvebu_gpio_chip *mvchip)
166 {
167 int cpu;
168
169 switch (mvchip->soc_variant) {
170 case MVEBU_GPIO_SOC_VARIANT_ORION:
171 return mvchip->membase + GPIO_LEVEL_MASK_OFF;
172 case MVEBU_GPIO_SOC_VARIANT_MV78200:
173 cpu = smp_processor_id();
174 return mvchip->membase + GPIO_LEVEL_MASK_MV78200_OFF(cpu);
175 case MVEBU_GPIO_SOC_VARIANT_ARMADAXP:
176 cpu = smp_processor_id();
177 return mvchip->percpu_membase +
178 GPIO_LEVEL_MASK_ARMADAXP_OFF(cpu);
179 default:
180 BUG();
181 }
182 }
183
184 /*
185 * Functions implementing the gpio_chip methods
186 */
187
188 static void mvebu_gpio_set(struct gpio_chip *chip, unsigned pin, int value)
189 {
190 struct mvebu_gpio_chip *mvchip = gpiochip_get_data(chip);
191 unsigned long flags;
192 u32 u;
193
194 spin_lock_irqsave(&mvchip->lock, flags);
195 u = readl_relaxed(mvebu_gpioreg_out(mvchip));
196 if (value)
197 u |= 1 << pin;
198 else
199 u &= ~(1 << pin);
200 writel_relaxed(u, mvebu_gpioreg_out(mvchip));
201 spin_unlock_irqrestore(&mvchip->lock, flags);
202 }
203
204 static int mvebu_gpio_get(struct gpio_chip *chip, unsigned pin)
205 {
206 struct mvebu_gpio_chip *mvchip = gpiochip_get_data(chip);
207 u32 u;
208
209 if (readl_relaxed(mvebu_gpioreg_io_conf(mvchip)) & (1 << pin)) {
210 u = readl_relaxed(mvebu_gpioreg_data_in(mvchip)) ^
211 readl_relaxed(mvebu_gpioreg_in_pol(mvchip));
212 } else {
213 u = readl_relaxed(mvebu_gpioreg_out(mvchip));
214 }
215
216 return (u >> pin) & 1;
217 }
218
219 static void mvebu_gpio_blink(struct gpio_chip *chip, unsigned pin, int value)
220 {
221 struct mvebu_gpio_chip *mvchip = gpiochip_get_data(chip);
222 unsigned long flags;
223 u32 u;
224
225 spin_lock_irqsave(&mvchip->lock, flags);
226 u = readl_relaxed(mvebu_gpioreg_blink(mvchip));
227 if (value)
228 u |= 1 << pin;
229 else
230 u &= ~(1 << pin);
231 writel_relaxed(u, mvebu_gpioreg_blink(mvchip));
232 spin_unlock_irqrestore(&mvchip->lock, flags);
233 }
234
235 static int mvebu_gpio_direction_input(struct gpio_chip *chip, unsigned pin)
236 {
237 struct mvebu_gpio_chip *mvchip = gpiochip_get_data(chip);
238 unsigned long flags;
239 int ret;
240 u32 u;
241
242 /* Check with the pinctrl driver whether this pin is usable as
243 * an input GPIO */
244 ret = pinctrl_gpio_direction_input(chip->base + pin);
245 if (ret)
246 return ret;
247
248 spin_lock_irqsave(&mvchip->lock, flags);
249 u = readl_relaxed(mvebu_gpioreg_io_conf(mvchip));
250 u |= 1 << pin;
251 writel_relaxed(u, mvebu_gpioreg_io_conf(mvchip));
252 spin_unlock_irqrestore(&mvchip->lock, flags);
253
254 return 0;
255 }
256
257 static int mvebu_gpio_direction_output(struct gpio_chip *chip, unsigned pin,
258 int value)
259 {
260 struct mvebu_gpio_chip *mvchip = gpiochip_get_data(chip);
261 unsigned long flags;
262 int ret;
263 u32 u;
264
265 /* Check with the pinctrl driver whether this pin is usable as
266 * an output GPIO */
267 ret = pinctrl_gpio_direction_output(chip->base + pin);
268 if (ret)
269 return ret;
270
271 mvebu_gpio_blink(chip, pin, 0);
272 mvebu_gpio_set(chip, pin, value);
273
274 spin_lock_irqsave(&mvchip->lock, flags);
275 u = readl_relaxed(mvebu_gpioreg_io_conf(mvchip));
276 u &= ~(1 << pin);
277 writel_relaxed(u, mvebu_gpioreg_io_conf(mvchip));
278 spin_unlock_irqrestore(&mvchip->lock, flags);
279
280 return 0;
281 }
282
283 static int mvebu_gpio_to_irq(struct gpio_chip *chip, unsigned pin)
284 {
285 struct mvebu_gpio_chip *mvchip = gpiochip_get_data(chip);
286 return irq_create_mapping(mvchip->domain, pin);
287 }
288
289 /*
290 * Functions implementing the irq_chip methods
291 */
292 static void mvebu_gpio_irq_ack(struct irq_data *d)
293 {
294 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
295 struct mvebu_gpio_chip *mvchip = gc->private;
296 u32 mask = ~(1 << (d->irq - gc->irq_base));
297
298 irq_gc_lock(gc);
299 writel_relaxed(mask, mvebu_gpioreg_edge_cause(mvchip));
300 irq_gc_unlock(gc);
301 }
302
303 static void mvebu_gpio_edge_irq_mask(struct irq_data *d)
304 {
305 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
306 struct mvebu_gpio_chip *mvchip = gc->private;
307 struct irq_chip_type *ct = irq_data_get_chip_type(d);
308 u32 mask = 1 << (d->irq - gc->irq_base);
309
310 irq_gc_lock(gc);
311 ct->mask_cache_priv &= ~mask;
312
313 writel_relaxed(ct->mask_cache_priv, mvebu_gpioreg_edge_mask(mvchip));
314 irq_gc_unlock(gc);
315 }
316
317 static void mvebu_gpio_edge_irq_unmask(struct irq_data *d)
318 {
319 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
320 struct mvebu_gpio_chip *mvchip = gc->private;
321 struct irq_chip_type *ct = irq_data_get_chip_type(d);
322
323 u32 mask = 1 << (d->irq - gc->irq_base);
324
325 irq_gc_lock(gc);
326 ct->mask_cache_priv |= mask;
327 writel_relaxed(ct->mask_cache_priv, mvebu_gpioreg_edge_mask(mvchip));
328 irq_gc_unlock(gc);
329 }
330
331 static void mvebu_gpio_level_irq_mask(struct irq_data *d)
332 {
333 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
334 struct mvebu_gpio_chip *mvchip = gc->private;
335 struct irq_chip_type *ct = irq_data_get_chip_type(d);
336
337 u32 mask = 1 << (d->irq - gc->irq_base);
338
339 irq_gc_lock(gc);
340 ct->mask_cache_priv &= ~mask;
341 writel_relaxed(ct->mask_cache_priv, mvebu_gpioreg_level_mask(mvchip));
342 irq_gc_unlock(gc);
343 }
344
345 static void mvebu_gpio_level_irq_unmask(struct irq_data *d)
346 {
347 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
348 struct mvebu_gpio_chip *mvchip = gc->private;
349 struct irq_chip_type *ct = irq_data_get_chip_type(d);
350
351 u32 mask = 1 << (d->irq - gc->irq_base);
352
353 irq_gc_lock(gc);
354 ct->mask_cache_priv |= mask;
355 writel_relaxed(ct->mask_cache_priv, mvebu_gpioreg_level_mask(mvchip));
356 irq_gc_unlock(gc);
357 }
358
359 /*****************************************************************************
360 * MVEBU GPIO IRQ
361 *
362 * GPIO_IN_POL register controls whether GPIO_DATA_IN will hold the same
363 * value of the line or the opposite value.
364 *
365 * Level IRQ handlers: DATA_IN is used directly as cause register.
366 * Interrupt are masked by LEVEL_MASK registers.
367 * Edge IRQ handlers: Change in DATA_IN are latched in EDGE_CAUSE.
368 * Interrupt are masked by EDGE_MASK registers.
369 * Both-edge handlers: Similar to regular Edge handlers, but also swaps
370 * the polarity to catch the next line transaction.
371 * This is a race condition that might not perfectly
372 * work on some use cases.
373 *
374 * Every eight GPIO lines are grouped (OR'ed) before going up to main
375 * cause register.
376 *
377 * EDGE cause mask
378 * data-in /--------| |-----| |----\
379 * -----| |----- ---- to main cause reg
380 * X \----------------| |----/
381 * polarity LEVEL mask
382 *
383 ****************************************************************************/
384
385 static int mvebu_gpio_irq_set_type(struct irq_data *d, unsigned int type)
386 {
387 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
388 struct irq_chip_type *ct = irq_data_get_chip_type(d);
389 struct mvebu_gpio_chip *mvchip = gc->private;
390 int pin;
391 u32 u;
392
393 pin = d->hwirq;
394
395 u = readl_relaxed(mvebu_gpioreg_io_conf(mvchip)) & (1 << pin);
396 if (!u)
397 return -EINVAL;
398
399 type &= IRQ_TYPE_SENSE_MASK;
400 if (type == IRQ_TYPE_NONE)
401 return -EINVAL;
402
403 /* Check if we need to change chip and handler */
404 if (!(ct->type & type))
405 if (irq_setup_alt_chip(d, type))
406 return -EINVAL;
407
408 /*
409 * Configure interrupt polarity.
410 */
411 switch (type) {
412 case IRQ_TYPE_EDGE_RISING:
413 case IRQ_TYPE_LEVEL_HIGH:
414 u = readl_relaxed(mvebu_gpioreg_in_pol(mvchip));
415 u &= ~(1 << pin);
416 writel_relaxed(u, mvebu_gpioreg_in_pol(mvchip));
417 break;
418 case IRQ_TYPE_EDGE_FALLING:
419 case IRQ_TYPE_LEVEL_LOW:
420 u = readl_relaxed(mvebu_gpioreg_in_pol(mvchip));
421 u |= 1 << pin;
422 writel_relaxed(u, mvebu_gpioreg_in_pol(mvchip));
423 break;
424 case IRQ_TYPE_EDGE_BOTH: {
425 u32 v;
426
427 v = readl_relaxed(mvebu_gpioreg_in_pol(mvchip)) ^
428 readl_relaxed(mvebu_gpioreg_data_in(mvchip));
429
430 /*
431 * set initial polarity based on current input level
432 */
433 u = readl_relaxed(mvebu_gpioreg_in_pol(mvchip));
434 if (v & (1 << pin))
435 u |= 1 << pin; /* falling */
436 else
437 u &= ~(1 << pin); /* rising */
438 writel_relaxed(u, mvebu_gpioreg_in_pol(mvchip));
439 break;
440 }
441 }
442 return 0;
443 }
444
445 static void mvebu_gpio_irq_handler(struct irq_desc *desc)
446 {
447 struct mvebu_gpio_chip *mvchip = irq_desc_get_handler_data(desc);
448 struct irq_chip *chip = irq_desc_get_chip(desc);
449 u32 cause, type;
450 int i;
451
452 if (mvchip == NULL)
453 return;
454
455 chained_irq_enter(chip, desc);
456
457 cause = readl_relaxed(mvebu_gpioreg_data_in(mvchip)) &
458 readl_relaxed(mvebu_gpioreg_level_mask(mvchip));
459 cause |= readl_relaxed(mvebu_gpioreg_edge_cause(mvchip)) &
460 readl_relaxed(mvebu_gpioreg_edge_mask(mvchip));
461
462 for (i = 0; i < mvchip->chip.ngpio; i++) {
463 int irq;
464
465 irq = mvchip->irqbase + i;
466
467 if (!(cause & (1 << i)))
468 continue;
469
470 type = irq_get_trigger_type(irq);
471 if ((type & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_BOTH) {
472 /* Swap polarity (race with GPIO line) */
473 u32 polarity;
474
475 polarity = readl_relaxed(mvebu_gpioreg_in_pol(mvchip));
476 polarity ^= 1 << i;
477 writel_relaxed(polarity, mvebu_gpioreg_in_pol(mvchip));
478 }
479
480 generic_handle_irq(irq);
481 }
482
483 chained_irq_exit(chip, desc);
484 }
485
486 #ifdef CONFIG_DEBUG_FS
487 #include <linux/seq_file.h>
488
489 static void mvebu_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
490 {
491 struct mvebu_gpio_chip *mvchip = gpiochip_get_data(chip);
492 u32 out, io_conf, blink, in_pol, data_in, cause, edg_msk, lvl_msk;
493 int i;
494
495 out = readl_relaxed(mvebu_gpioreg_out(mvchip));
496 io_conf = readl_relaxed(mvebu_gpioreg_io_conf(mvchip));
497 blink = readl_relaxed(mvebu_gpioreg_blink(mvchip));
498 in_pol = readl_relaxed(mvebu_gpioreg_in_pol(mvchip));
499 data_in = readl_relaxed(mvebu_gpioreg_data_in(mvchip));
500 cause = readl_relaxed(mvebu_gpioreg_edge_cause(mvchip));
501 edg_msk = readl_relaxed(mvebu_gpioreg_edge_mask(mvchip));
502 lvl_msk = readl_relaxed(mvebu_gpioreg_level_mask(mvchip));
503
504 for (i = 0; i < chip->ngpio; i++) {
505 const char *label;
506 u32 msk;
507 bool is_out;
508
509 label = gpiochip_is_requested(chip, i);
510 if (!label)
511 continue;
512
513 msk = 1 << i;
514 is_out = !(io_conf & msk);
515
516 seq_printf(s, " gpio-%-3d (%-20.20s)", chip->base + i, label);
517
518 if (is_out) {
519 seq_printf(s, " out %s %s\n",
520 out & msk ? "hi" : "lo",
521 blink & msk ? "(blink )" : "");
522 continue;
523 }
524
525 seq_printf(s, " in %s (act %s) - IRQ",
526 (data_in ^ in_pol) & msk ? "hi" : "lo",
527 in_pol & msk ? "lo" : "hi");
528 if (!((edg_msk | lvl_msk) & msk)) {
529 seq_puts(s, " disabled\n");
530 continue;
531 }
532 if (edg_msk & msk)
533 seq_puts(s, " edge ");
534 if (lvl_msk & msk)
535 seq_puts(s, " level");
536 seq_printf(s, " (%s)\n", cause & msk ? "pending" : "clear ");
537 }
538 }
539 #else
540 #define mvebu_gpio_dbg_show NULL
541 #endif
542
543 static const struct of_device_id mvebu_gpio_of_match[] = {
544 {
545 .compatible = "marvell,orion-gpio",
546 .data = (void *) MVEBU_GPIO_SOC_VARIANT_ORION,
547 },
548 {
549 .compatible = "marvell,mv78200-gpio",
550 .data = (void *) MVEBU_GPIO_SOC_VARIANT_MV78200,
551 },
552 {
553 .compatible = "marvell,armadaxp-gpio",
554 .data = (void *) MVEBU_GPIO_SOC_VARIANT_ARMADAXP,
555 },
556 {
557 /* sentinel */
558 },
559 };
560
561 static int mvebu_gpio_suspend(struct platform_device *pdev, pm_message_t state)
562 {
563 struct mvebu_gpio_chip *mvchip = platform_get_drvdata(pdev);
564 int i;
565
566 mvchip->out_reg = readl(mvebu_gpioreg_out(mvchip));
567 mvchip->io_conf_reg = readl(mvebu_gpioreg_io_conf(mvchip));
568 mvchip->blink_en_reg = readl(mvebu_gpioreg_blink(mvchip));
569 mvchip->in_pol_reg = readl(mvebu_gpioreg_in_pol(mvchip));
570
571 switch (mvchip->soc_variant) {
572 case MVEBU_GPIO_SOC_VARIANT_ORION:
573 mvchip->edge_mask_regs[0] =
574 readl(mvchip->membase + GPIO_EDGE_MASK_OFF);
575 mvchip->level_mask_regs[0] =
576 readl(mvchip->membase + GPIO_LEVEL_MASK_OFF);
577 break;
578 case MVEBU_GPIO_SOC_VARIANT_MV78200:
579 for (i = 0; i < 2; i++) {
580 mvchip->edge_mask_regs[i] =
581 readl(mvchip->membase +
582 GPIO_EDGE_MASK_MV78200_OFF(i));
583 mvchip->level_mask_regs[i] =
584 readl(mvchip->membase +
585 GPIO_LEVEL_MASK_MV78200_OFF(i));
586 }
587 break;
588 case MVEBU_GPIO_SOC_VARIANT_ARMADAXP:
589 for (i = 0; i < 4; i++) {
590 mvchip->edge_mask_regs[i] =
591 readl(mvchip->membase +
592 GPIO_EDGE_MASK_ARMADAXP_OFF(i));
593 mvchip->level_mask_regs[i] =
594 readl(mvchip->membase +
595 GPIO_LEVEL_MASK_ARMADAXP_OFF(i));
596 }
597 break;
598 default:
599 BUG();
600 }
601
602 return 0;
603 }
604
605 static int mvebu_gpio_resume(struct platform_device *pdev)
606 {
607 struct mvebu_gpio_chip *mvchip = platform_get_drvdata(pdev);
608 int i;
609
610 writel(mvchip->out_reg, mvebu_gpioreg_out(mvchip));
611 writel(mvchip->io_conf_reg, mvebu_gpioreg_io_conf(mvchip));
612 writel(mvchip->blink_en_reg, mvebu_gpioreg_blink(mvchip));
613 writel(mvchip->in_pol_reg, mvebu_gpioreg_in_pol(mvchip));
614
615 switch (mvchip->soc_variant) {
616 case MVEBU_GPIO_SOC_VARIANT_ORION:
617 writel(mvchip->edge_mask_regs[0],
618 mvchip->membase + GPIO_EDGE_MASK_OFF);
619 writel(mvchip->level_mask_regs[0],
620 mvchip->membase + GPIO_LEVEL_MASK_OFF);
621 break;
622 case MVEBU_GPIO_SOC_VARIANT_MV78200:
623 for (i = 0; i < 2; i++) {
624 writel(mvchip->edge_mask_regs[i],
625 mvchip->membase + GPIO_EDGE_MASK_MV78200_OFF(i));
626 writel(mvchip->level_mask_regs[i],
627 mvchip->membase +
628 GPIO_LEVEL_MASK_MV78200_OFF(i));
629 }
630 break;
631 case MVEBU_GPIO_SOC_VARIANT_ARMADAXP:
632 for (i = 0; i < 4; i++) {
633 writel(mvchip->edge_mask_regs[i],
634 mvchip->membase +
635 GPIO_EDGE_MASK_ARMADAXP_OFF(i));
636 writel(mvchip->level_mask_regs[i],
637 mvchip->membase +
638 GPIO_LEVEL_MASK_ARMADAXP_OFF(i));
639 }
640 break;
641 default:
642 BUG();
643 }
644
645 return 0;
646 }
647
648 static int mvebu_gpio_probe(struct platform_device *pdev)
649 {
650 struct mvebu_gpio_chip *mvchip;
651 const struct of_device_id *match;
652 struct device_node *np = pdev->dev.of_node;
653 struct resource *res;
654 struct irq_chip_generic *gc;
655 struct irq_chip_type *ct;
656 struct clk *clk;
657 unsigned int ngpios;
658 int soc_variant;
659 int i, cpu, id;
660 int err;
661
662 match = of_match_device(mvebu_gpio_of_match, &pdev->dev);
663 if (match)
664 soc_variant = (int) match->data;
665 else
666 soc_variant = MVEBU_GPIO_SOC_VARIANT_ORION;
667
668 mvchip = devm_kzalloc(&pdev->dev, sizeof(struct mvebu_gpio_chip),
669 GFP_KERNEL);
670 if (!mvchip)
671 return -ENOMEM;
672
673 platform_set_drvdata(pdev, mvchip);
674
675 if (of_property_read_u32(pdev->dev.of_node, "ngpios", &ngpios)) {
676 dev_err(&pdev->dev, "Missing ngpios OF property\n");
677 return -ENODEV;
678 }
679
680 id = of_alias_get_id(pdev->dev.of_node, "gpio");
681 if (id < 0) {
682 dev_err(&pdev->dev, "Couldn't get OF id\n");
683 return id;
684 }
685
686 clk = devm_clk_get(&pdev->dev, NULL);
687 /* Not all SoCs require a clock.*/
688 if (!IS_ERR(clk))
689 clk_prepare_enable(clk);
690
691 mvchip->soc_variant = soc_variant;
692 mvchip->chip.label = dev_name(&pdev->dev);
693 mvchip->chip.parent = &pdev->dev;
694 mvchip->chip.request = gpiochip_generic_request;
695 mvchip->chip.free = gpiochip_generic_free;
696 mvchip->chip.direction_input = mvebu_gpio_direction_input;
697 mvchip->chip.get = mvebu_gpio_get;
698 mvchip->chip.direction_output = mvebu_gpio_direction_output;
699 mvchip->chip.set = mvebu_gpio_set;
700 mvchip->chip.to_irq = mvebu_gpio_to_irq;
701 mvchip->chip.base = id * MVEBU_MAX_GPIO_PER_BANK;
702 mvchip->chip.ngpio = ngpios;
703 mvchip->chip.can_sleep = false;
704 mvchip->chip.of_node = np;
705 mvchip->chip.dbg_show = mvebu_gpio_dbg_show;
706
707 spin_lock_init(&mvchip->lock);
708 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
709 mvchip->membase = devm_ioremap_resource(&pdev->dev, res);
710 if (IS_ERR(mvchip->membase))
711 return PTR_ERR(mvchip->membase);
712
713 /* The Armada XP has a second range of registers for the
714 * per-CPU registers */
715 if (soc_variant == MVEBU_GPIO_SOC_VARIANT_ARMADAXP) {
716 res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
717 mvchip->percpu_membase = devm_ioremap_resource(&pdev->dev,
718 res);
719 if (IS_ERR(mvchip->percpu_membase))
720 return PTR_ERR(mvchip->percpu_membase);
721 }
722
723 /*
724 * Mask and clear GPIO interrupts.
725 */
726 switch (soc_variant) {
727 case MVEBU_GPIO_SOC_VARIANT_ORION:
728 writel_relaxed(0, mvchip->membase + GPIO_EDGE_CAUSE_OFF);
729 writel_relaxed(0, mvchip->membase + GPIO_EDGE_MASK_OFF);
730 writel_relaxed(0, mvchip->membase + GPIO_LEVEL_MASK_OFF);
731 break;
732 case MVEBU_GPIO_SOC_VARIANT_MV78200:
733 writel_relaxed(0, mvchip->membase + GPIO_EDGE_CAUSE_OFF);
734 for (cpu = 0; cpu < 2; cpu++) {
735 writel_relaxed(0, mvchip->membase +
736 GPIO_EDGE_MASK_MV78200_OFF(cpu));
737 writel_relaxed(0, mvchip->membase +
738 GPIO_LEVEL_MASK_MV78200_OFF(cpu));
739 }
740 break;
741 case MVEBU_GPIO_SOC_VARIANT_ARMADAXP:
742 writel_relaxed(0, mvchip->membase + GPIO_EDGE_CAUSE_OFF);
743 writel_relaxed(0, mvchip->membase + GPIO_EDGE_MASK_OFF);
744 writel_relaxed(0, mvchip->membase + GPIO_LEVEL_MASK_OFF);
745 for (cpu = 0; cpu < 4; cpu++) {
746 writel_relaxed(0, mvchip->percpu_membase +
747 GPIO_EDGE_CAUSE_ARMADAXP_OFF(cpu));
748 writel_relaxed(0, mvchip->percpu_membase +
749 GPIO_EDGE_MASK_ARMADAXP_OFF(cpu));
750 writel_relaxed(0, mvchip->percpu_membase +
751 GPIO_LEVEL_MASK_ARMADAXP_OFF(cpu));
752 }
753 break;
754 default:
755 BUG();
756 }
757
758 devm_gpiochip_add_data(&pdev->dev, &mvchip->chip, mvchip);
759
760 /* Some gpio controllers do not provide irq support */
761 if (!of_irq_count(np))
762 return 0;
763
764 /* Setup the interrupt handlers. Each chip can have up to 4
765 * interrupt handlers, with each handler dealing with 8 GPIO
766 * pins. */
767 for (i = 0; i < 4; i++) {
768 int irq = platform_get_irq(pdev, i);
769
770 if (irq < 0)
771 continue;
772 irq_set_chained_handler_and_data(irq, mvebu_gpio_irq_handler,
773 mvchip);
774 }
775
776 mvchip->irqbase = irq_alloc_descs(-1, 0, ngpios, -1);
777 if (mvchip->irqbase < 0) {
778 dev_err(&pdev->dev, "no irqs\n");
779 return mvchip->irqbase;
780 }
781
782 gc = irq_alloc_generic_chip("mvebu_gpio_irq", 2, mvchip->irqbase,
783 mvchip->membase, handle_level_irq);
784 if (!gc) {
785 dev_err(&pdev->dev, "Cannot allocate generic irq_chip\n");
786 return -ENOMEM;
787 }
788
789 gc->private = mvchip;
790 ct = &gc->chip_types[0];
791 ct->type = IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW;
792 ct->chip.irq_mask = mvebu_gpio_level_irq_mask;
793 ct->chip.irq_unmask = mvebu_gpio_level_irq_unmask;
794 ct->chip.irq_set_type = mvebu_gpio_irq_set_type;
795 ct->chip.name = mvchip->chip.label;
796
797 ct = &gc->chip_types[1];
798 ct->type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING;
799 ct->chip.irq_ack = mvebu_gpio_irq_ack;
800 ct->chip.irq_mask = mvebu_gpio_edge_irq_mask;
801 ct->chip.irq_unmask = mvebu_gpio_edge_irq_unmask;
802 ct->chip.irq_set_type = mvebu_gpio_irq_set_type;
803 ct->handler = handle_edge_irq;
804 ct->chip.name = mvchip->chip.label;
805
806 irq_setup_generic_chip(gc, IRQ_MSK(ngpios), 0,
807 IRQ_NOREQUEST, IRQ_LEVEL | IRQ_NOPROBE);
808
809 /* Setup irq domain on top of the generic chip. */
810 mvchip->domain = irq_domain_add_simple(np, mvchip->chip.ngpio,
811 mvchip->irqbase,
812 &irq_domain_simple_ops,
813 mvchip);
814 if (!mvchip->domain) {
815 dev_err(&pdev->dev, "couldn't allocate irq domain %s (DT).\n",
816 mvchip->chip.label);
817 err = -ENODEV;
818 goto err_generic_chip;
819 }
820
821 return 0;
822
823 err_generic_chip:
824 irq_remove_generic_chip(gc, IRQ_MSK(ngpios), IRQ_NOREQUEST,
825 IRQ_LEVEL | IRQ_NOPROBE);
826 kfree(gc);
827
828 return err;
829 }
830
831 static struct platform_driver mvebu_gpio_driver = {
832 .driver = {
833 .name = "mvebu-gpio",
834 .of_match_table = mvebu_gpio_of_match,
835 },
836 .probe = mvebu_gpio_probe,
837 .suspend = mvebu_gpio_suspend,
838 .resume = mvebu_gpio_resume,
839 };
840 builtin_platform_driver(mvebu_gpio_driver);
Linux kernel - Deliverables
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