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Merge tag 'wireless-drivers-for-davem-2015-04-01' of git://git.kernel.org/pub/scm...
[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/module.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 int mvebu_gpio_request(struct gpio_chip *chip, unsigned pin)
189 {
190 return pinctrl_request_gpio(chip->base + pin);
191 }
192
193 static void mvebu_gpio_free(struct gpio_chip *chip, unsigned pin)
194 {
195 pinctrl_free_gpio(chip->base + pin);
196 }
197
198 static void mvebu_gpio_set(struct gpio_chip *chip, unsigned pin, int value)
199 {
200 struct mvebu_gpio_chip *mvchip =
201 container_of(chip, struct mvebu_gpio_chip, chip);
202 unsigned long flags;
203 u32 u;
204
205 spin_lock_irqsave(&mvchip->lock, flags);
206 u = readl_relaxed(mvebu_gpioreg_out(mvchip));
207 if (value)
208 u |= 1 << pin;
209 else
210 u &= ~(1 << pin);
211 writel_relaxed(u, mvebu_gpioreg_out(mvchip));
212 spin_unlock_irqrestore(&mvchip->lock, flags);
213 }
214
215 static int mvebu_gpio_get(struct gpio_chip *chip, unsigned pin)
216 {
217 struct mvebu_gpio_chip *mvchip =
218 container_of(chip, struct mvebu_gpio_chip, chip);
219 u32 u;
220
221 if (readl_relaxed(mvebu_gpioreg_io_conf(mvchip)) & (1 << pin)) {
222 u = readl_relaxed(mvebu_gpioreg_data_in(mvchip)) ^
223 readl_relaxed(mvebu_gpioreg_in_pol(mvchip));
224 } else {
225 u = readl_relaxed(mvebu_gpioreg_out(mvchip));
226 }
227
228 return (u >> pin) & 1;
229 }
230
231 static void mvebu_gpio_blink(struct gpio_chip *chip, unsigned pin, int value)
232 {
233 struct mvebu_gpio_chip *mvchip =
234 container_of(chip, struct mvebu_gpio_chip, chip);
235 unsigned long flags;
236 u32 u;
237
238 spin_lock_irqsave(&mvchip->lock, flags);
239 u = readl_relaxed(mvebu_gpioreg_blink(mvchip));
240 if (value)
241 u |= 1 << pin;
242 else
243 u &= ~(1 << pin);
244 writel_relaxed(u, mvebu_gpioreg_blink(mvchip));
245 spin_unlock_irqrestore(&mvchip->lock, flags);
246 }
247
248 static int mvebu_gpio_direction_input(struct gpio_chip *chip, unsigned pin)
249 {
250 struct mvebu_gpio_chip *mvchip =
251 container_of(chip, struct mvebu_gpio_chip, chip);
252 unsigned long flags;
253 int ret;
254 u32 u;
255
256 /* Check with the pinctrl driver whether this pin is usable as
257 * an input GPIO */
258 ret = pinctrl_gpio_direction_input(chip->base + pin);
259 if (ret)
260 return ret;
261
262 spin_lock_irqsave(&mvchip->lock, flags);
263 u = readl_relaxed(mvebu_gpioreg_io_conf(mvchip));
264 u |= 1 << pin;
265 writel_relaxed(u, mvebu_gpioreg_io_conf(mvchip));
266 spin_unlock_irqrestore(&mvchip->lock, flags);
267
268 return 0;
269 }
270
271 static int mvebu_gpio_direction_output(struct gpio_chip *chip, unsigned pin,
272 int value)
273 {
274 struct mvebu_gpio_chip *mvchip =
275 container_of(chip, struct mvebu_gpio_chip, chip);
276 unsigned long flags;
277 int ret;
278 u32 u;
279
280 /* Check with the pinctrl driver whether this pin is usable as
281 * an output GPIO */
282 ret = pinctrl_gpio_direction_output(chip->base + pin);
283 if (ret)
284 return ret;
285
286 mvebu_gpio_blink(chip, pin, 0);
287 mvebu_gpio_set(chip, pin, value);
288
289 spin_lock_irqsave(&mvchip->lock, flags);
290 u = readl_relaxed(mvebu_gpioreg_io_conf(mvchip));
291 u &= ~(1 << pin);
292 writel_relaxed(u, mvebu_gpioreg_io_conf(mvchip));
293 spin_unlock_irqrestore(&mvchip->lock, flags);
294
295 return 0;
296 }
297
298 static int mvebu_gpio_to_irq(struct gpio_chip *chip, unsigned pin)
299 {
300 struct mvebu_gpio_chip *mvchip =
301 container_of(chip, struct mvebu_gpio_chip, chip);
302 return irq_create_mapping(mvchip->domain, pin);
303 }
304
305 /*
306 * Functions implementing the irq_chip methods
307 */
308 static void mvebu_gpio_irq_ack(struct irq_data *d)
309 {
310 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
311 struct mvebu_gpio_chip *mvchip = gc->private;
312 u32 mask = ~(1 << (d->irq - gc->irq_base));
313
314 irq_gc_lock(gc);
315 writel_relaxed(mask, mvebu_gpioreg_edge_cause(mvchip));
316 irq_gc_unlock(gc);
317 }
318
319 static void mvebu_gpio_edge_irq_mask(struct irq_data *d)
320 {
321 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
322 struct mvebu_gpio_chip *mvchip = gc->private;
323 u32 mask = 1 << (d->irq - gc->irq_base);
324
325 irq_gc_lock(gc);
326 gc->mask_cache &= ~mask;
327 writel_relaxed(gc->mask_cache, mvebu_gpioreg_edge_mask(mvchip));
328 irq_gc_unlock(gc);
329 }
330
331 static void mvebu_gpio_edge_irq_unmask(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 u32 mask = 1 << (d->irq - gc->irq_base);
336
337 irq_gc_lock(gc);
338 gc->mask_cache |= mask;
339 writel_relaxed(gc->mask_cache, mvebu_gpioreg_edge_mask(mvchip));
340 irq_gc_unlock(gc);
341 }
342
343 static void mvebu_gpio_level_irq_mask(struct irq_data *d)
344 {
345 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
346 struct mvebu_gpio_chip *mvchip = gc->private;
347 u32 mask = 1 << (d->irq - gc->irq_base);
348
349 irq_gc_lock(gc);
350 gc->mask_cache &= ~mask;
351 writel_relaxed(gc->mask_cache, mvebu_gpioreg_level_mask(mvchip));
352 irq_gc_unlock(gc);
353 }
354
355 static void mvebu_gpio_level_irq_unmask(struct irq_data *d)
356 {
357 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
358 struct mvebu_gpio_chip *mvchip = gc->private;
359 u32 mask = 1 << (d->irq - gc->irq_base);
360
361 irq_gc_lock(gc);
362 gc->mask_cache |= mask;
363 writel_relaxed(gc->mask_cache, mvebu_gpioreg_level_mask(mvchip));
364 irq_gc_unlock(gc);
365 }
366
367 /*****************************************************************************
368 * MVEBU GPIO IRQ
369 *
370 * GPIO_IN_POL register controls whether GPIO_DATA_IN will hold the same
371 * value of the line or the opposite value.
372 *
373 * Level IRQ handlers: DATA_IN is used directly as cause register.
374 * Interrupt are masked by LEVEL_MASK registers.
375 * Edge IRQ handlers: Change in DATA_IN are latched in EDGE_CAUSE.
376 * Interrupt are masked by EDGE_MASK registers.
377 * Both-edge handlers: Similar to regular Edge handlers, but also swaps
378 * the polarity to catch the next line transaction.
379 * This is a race condition that might not perfectly
380 * work on some use cases.
381 *
382 * Every eight GPIO lines are grouped (OR'ed) before going up to main
383 * cause register.
384 *
385 * EDGE cause mask
386 * data-in /--------| |-----| |----\
387 * -----| |----- ---- to main cause reg
388 * X \----------------| |----/
389 * polarity LEVEL mask
390 *
391 ****************************************************************************/
392
393 static int mvebu_gpio_irq_set_type(struct irq_data *d, unsigned int type)
394 {
395 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
396 struct irq_chip_type *ct = irq_data_get_chip_type(d);
397 struct mvebu_gpio_chip *mvchip = gc->private;
398 int pin;
399 u32 u;
400
401 pin = d->hwirq;
402
403 u = readl_relaxed(mvebu_gpioreg_io_conf(mvchip)) & (1 << pin);
404 if (!u)
405 return -EINVAL;
406
407 type &= IRQ_TYPE_SENSE_MASK;
408 if (type == IRQ_TYPE_NONE)
409 return -EINVAL;
410
411 /* Check if we need to change chip and handler */
412 if (!(ct->type & type))
413 if (irq_setup_alt_chip(d, type))
414 return -EINVAL;
415
416 /*
417 * Configure interrupt polarity.
418 */
419 switch (type) {
420 case IRQ_TYPE_EDGE_RISING:
421 case IRQ_TYPE_LEVEL_HIGH:
422 u = readl_relaxed(mvebu_gpioreg_in_pol(mvchip));
423 u &= ~(1 << pin);
424 writel_relaxed(u, mvebu_gpioreg_in_pol(mvchip));
425 break;
426 case IRQ_TYPE_EDGE_FALLING:
427 case IRQ_TYPE_LEVEL_LOW:
428 u = readl_relaxed(mvebu_gpioreg_in_pol(mvchip));
429 u |= 1 << pin;
430 writel_relaxed(u, mvebu_gpioreg_in_pol(mvchip));
431 break;
432 case IRQ_TYPE_EDGE_BOTH: {
433 u32 v;
434
435 v = readl_relaxed(mvebu_gpioreg_in_pol(mvchip)) ^
436 readl_relaxed(mvebu_gpioreg_data_in(mvchip));
437
438 /*
439 * set initial polarity based on current input level
440 */
441 u = readl_relaxed(mvebu_gpioreg_in_pol(mvchip));
442 if (v & (1 << pin))
443 u |= 1 << pin; /* falling */
444 else
445 u &= ~(1 << pin); /* rising */
446 writel_relaxed(u, mvebu_gpioreg_in_pol(mvchip));
447 break;
448 }
449 }
450 return 0;
451 }
452
453 static void mvebu_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
454 {
455 struct mvebu_gpio_chip *mvchip = irq_get_handler_data(irq);
456 struct irq_chip *chip = irq_desc_get_chip(desc);
457 u32 cause, type;
458 int i;
459
460 if (mvchip == NULL)
461 return;
462
463 chained_irq_enter(chip, desc);
464
465 cause = readl_relaxed(mvebu_gpioreg_data_in(mvchip)) &
466 readl_relaxed(mvebu_gpioreg_level_mask(mvchip));
467 cause |= readl_relaxed(mvebu_gpioreg_edge_cause(mvchip)) &
468 readl_relaxed(mvebu_gpioreg_edge_mask(mvchip));
469
470 for (i = 0; i < mvchip->chip.ngpio; i++) {
471 int irq;
472
473 irq = mvchip->irqbase + i;
474
475 if (!(cause & (1 << i)))
476 continue;
477
478 type = irq_get_trigger_type(irq);
479 if ((type & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_BOTH) {
480 /* Swap polarity (race with GPIO line) */
481 u32 polarity;
482
483 polarity = readl_relaxed(mvebu_gpioreg_in_pol(mvchip));
484 polarity ^= 1 << i;
485 writel_relaxed(polarity, mvebu_gpioreg_in_pol(mvchip));
486 }
487
488 generic_handle_irq(irq);
489 }
490
491 chained_irq_exit(chip, desc);
492 }
493
494 #ifdef CONFIG_DEBUG_FS
495 #include <linux/seq_file.h>
496
497 static void mvebu_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
498 {
499 struct mvebu_gpio_chip *mvchip =
500 container_of(chip, struct mvebu_gpio_chip, chip);
501 u32 out, io_conf, blink, in_pol, data_in, cause, edg_msk, lvl_msk;
502 int i;
503
504 out = readl_relaxed(mvebu_gpioreg_out(mvchip));
505 io_conf = readl_relaxed(mvebu_gpioreg_io_conf(mvchip));
506 blink = readl_relaxed(mvebu_gpioreg_blink(mvchip));
507 in_pol = readl_relaxed(mvebu_gpioreg_in_pol(mvchip));
508 data_in = readl_relaxed(mvebu_gpioreg_data_in(mvchip));
509 cause = readl_relaxed(mvebu_gpioreg_edge_cause(mvchip));
510 edg_msk = readl_relaxed(mvebu_gpioreg_edge_mask(mvchip));
511 lvl_msk = readl_relaxed(mvebu_gpioreg_level_mask(mvchip));
512
513 for (i = 0; i < chip->ngpio; i++) {
514 const char *label;
515 u32 msk;
516 bool is_out;
517
518 label = gpiochip_is_requested(chip, i);
519 if (!label)
520 continue;
521
522 msk = 1 << i;
523 is_out = !(io_conf & msk);
524
525 seq_printf(s, " gpio-%-3d (%-20.20s)", chip->base + i, label);
526
527 if (is_out) {
528 seq_printf(s, " out %s %s\n",
529 out & msk ? "hi" : "lo",
530 blink & msk ? "(blink )" : "");
531 continue;
532 }
533
534 seq_printf(s, " in %s (act %s) - IRQ",
535 (data_in ^ in_pol) & msk ? "hi" : "lo",
536 in_pol & msk ? "lo" : "hi");
537 if (!((edg_msk | lvl_msk) & msk)) {
538 seq_puts(s, " disabled\n");
539 continue;
540 }
541 if (edg_msk & msk)
542 seq_puts(s, " edge ");
543 if (lvl_msk & msk)
544 seq_puts(s, " level");
545 seq_printf(s, " (%s)\n", cause & msk ? "pending" : "clear ");
546 }
547 }
548 #else
549 #define mvebu_gpio_dbg_show NULL
550 #endif
551
552 static const struct of_device_id mvebu_gpio_of_match[] = {
553 {
554 .compatible = "marvell,orion-gpio",
555 .data = (void *) MVEBU_GPIO_SOC_VARIANT_ORION,
556 },
557 {
558 .compatible = "marvell,mv78200-gpio",
559 .data = (void *) MVEBU_GPIO_SOC_VARIANT_MV78200,
560 },
561 {
562 .compatible = "marvell,armadaxp-gpio",
563 .data = (void *) MVEBU_GPIO_SOC_VARIANT_ARMADAXP,
564 },
565 {
566 /* sentinel */
567 },
568 };
569 MODULE_DEVICE_TABLE(of, mvebu_gpio_of_match);
570
571 static int mvebu_gpio_suspend(struct platform_device *pdev, pm_message_t state)
572 {
573 struct mvebu_gpio_chip *mvchip = platform_get_drvdata(pdev);
574 int i;
575
576 mvchip->out_reg = readl(mvebu_gpioreg_out(mvchip));
577 mvchip->io_conf_reg = readl(mvebu_gpioreg_io_conf(mvchip));
578 mvchip->blink_en_reg = readl(mvebu_gpioreg_blink(mvchip));
579 mvchip->in_pol_reg = readl(mvebu_gpioreg_in_pol(mvchip));
580
581 switch (mvchip->soc_variant) {
582 case MVEBU_GPIO_SOC_VARIANT_ORION:
583 mvchip->edge_mask_regs[0] =
584 readl(mvchip->membase + GPIO_EDGE_MASK_OFF);
585 mvchip->level_mask_regs[0] =
586 readl(mvchip->membase + GPIO_LEVEL_MASK_OFF);
587 break;
588 case MVEBU_GPIO_SOC_VARIANT_MV78200:
589 for (i = 0; i < 2; i++) {
590 mvchip->edge_mask_regs[i] =
591 readl(mvchip->membase +
592 GPIO_EDGE_MASK_MV78200_OFF(i));
593 mvchip->level_mask_regs[i] =
594 readl(mvchip->membase +
595 GPIO_LEVEL_MASK_MV78200_OFF(i));
596 }
597 break;
598 case MVEBU_GPIO_SOC_VARIANT_ARMADAXP:
599 for (i = 0; i < 4; i++) {
600 mvchip->edge_mask_regs[i] =
601 readl(mvchip->membase +
602 GPIO_EDGE_MASK_ARMADAXP_OFF(i));
603 mvchip->level_mask_regs[i] =
604 readl(mvchip->membase +
605 GPIO_LEVEL_MASK_ARMADAXP_OFF(i));
606 }
607 break;
608 default:
609 BUG();
610 }
611
612 return 0;
613 }
614
615 static int mvebu_gpio_resume(struct platform_device *pdev)
616 {
617 struct mvebu_gpio_chip *mvchip = platform_get_drvdata(pdev);
618 int i;
619
620 writel(mvchip->out_reg, mvebu_gpioreg_out(mvchip));
621 writel(mvchip->io_conf_reg, mvebu_gpioreg_io_conf(mvchip));
622 writel(mvchip->blink_en_reg, mvebu_gpioreg_blink(mvchip));
623 writel(mvchip->in_pol_reg, mvebu_gpioreg_in_pol(mvchip));
624
625 switch (mvchip->soc_variant) {
626 case MVEBU_GPIO_SOC_VARIANT_ORION:
627 writel(mvchip->edge_mask_regs[0],
628 mvchip->membase + GPIO_EDGE_MASK_OFF);
629 writel(mvchip->level_mask_regs[0],
630 mvchip->membase + GPIO_LEVEL_MASK_OFF);
631 break;
632 case MVEBU_GPIO_SOC_VARIANT_MV78200:
633 for (i = 0; i < 2; i++) {
634 writel(mvchip->edge_mask_regs[i],
635 mvchip->membase + GPIO_EDGE_MASK_MV78200_OFF(i));
636 writel(mvchip->level_mask_regs[i],
637 mvchip->membase +
638 GPIO_LEVEL_MASK_MV78200_OFF(i));
639 }
640 break;
641 case MVEBU_GPIO_SOC_VARIANT_ARMADAXP:
642 for (i = 0; i < 4; i++) {
643 writel(mvchip->edge_mask_regs[i],
644 mvchip->membase +
645 GPIO_EDGE_MASK_ARMADAXP_OFF(i));
646 writel(mvchip->level_mask_regs[i],
647 mvchip->membase +
648 GPIO_LEVEL_MASK_ARMADAXP_OFF(i));
649 }
650 break;
651 default:
652 BUG();
653 }
654
655 return 0;
656 }
657
658 static int mvebu_gpio_probe(struct platform_device *pdev)
659 {
660 struct mvebu_gpio_chip *mvchip;
661 const struct of_device_id *match;
662 struct device_node *np = pdev->dev.of_node;
663 struct resource *res;
664 struct irq_chip_generic *gc;
665 struct irq_chip_type *ct;
666 struct clk *clk;
667 unsigned int ngpios;
668 int soc_variant;
669 int i, cpu, id;
670 int err;
671
672 match = of_match_device(mvebu_gpio_of_match, &pdev->dev);
673 if (match)
674 soc_variant = (int) match->data;
675 else
676 soc_variant = MVEBU_GPIO_SOC_VARIANT_ORION;
677
678 mvchip = devm_kzalloc(&pdev->dev, sizeof(struct mvebu_gpio_chip),
679 GFP_KERNEL);
680 if (!mvchip)
681 return -ENOMEM;
682
683 platform_set_drvdata(pdev, mvchip);
684
685 if (of_property_read_u32(pdev->dev.of_node, "ngpios", &ngpios)) {
686 dev_err(&pdev->dev, "Missing ngpios OF property\n");
687 return -ENODEV;
688 }
689
690 id = of_alias_get_id(pdev->dev.of_node, "gpio");
691 if (id < 0) {
692 dev_err(&pdev->dev, "Couldn't get OF id\n");
693 return id;
694 }
695
696 clk = devm_clk_get(&pdev->dev, NULL);
697 /* Not all SoCs require a clock.*/
698 if (!IS_ERR(clk))
699 clk_prepare_enable(clk);
700
701 mvchip->soc_variant = soc_variant;
702 mvchip->chip.label = dev_name(&pdev->dev);
703 mvchip->chip.dev = &pdev->dev;
704 mvchip->chip.request = mvebu_gpio_request;
705 mvchip->chip.free = mvebu_gpio_free;
706 mvchip->chip.direction_input = mvebu_gpio_direction_input;
707 mvchip->chip.get = mvebu_gpio_get;
708 mvchip->chip.direction_output = mvebu_gpio_direction_output;
709 mvchip->chip.set = mvebu_gpio_set;
710 mvchip->chip.to_irq = mvebu_gpio_to_irq;
711 mvchip->chip.base = id * MVEBU_MAX_GPIO_PER_BANK;
712 mvchip->chip.ngpio = ngpios;
713 mvchip->chip.can_sleep = false;
714 mvchip->chip.of_node = np;
715 mvchip->chip.dbg_show = mvebu_gpio_dbg_show;
716
717 spin_lock_init(&mvchip->lock);
718 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
719 mvchip->membase = devm_ioremap_resource(&pdev->dev, res);
720 if (IS_ERR(mvchip->membase))
721 return PTR_ERR(mvchip->membase);
722
723 /* The Armada XP has a second range of registers for the
724 * per-CPU registers */
725 if (soc_variant == MVEBU_GPIO_SOC_VARIANT_ARMADAXP) {
726 res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
727 mvchip->percpu_membase = devm_ioremap_resource(&pdev->dev,
728 res);
729 if (IS_ERR(mvchip->percpu_membase))
730 return PTR_ERR(mvchip->percpu_membase);
731 }
732
733 /*
734 * Mask and clear GPIO interrupts.
735 */
736 switch (soc_variant) {
737 case MVEBU_GPIO_SOC_VARIANT_ORION:
738 writel_relaxed(0, mvchip->membase + GPIO_EDGE_CAUSE_OFF);
739 writel_relaxed(0, mvchip->membase + GPIO_EDGE_MASK_OFF);
740 writel_relaxed(0, mvchip->membase + GPIO_LEVEL_MASK_OFF);
741 break;
742 case MVEBU_GPIO_SOC_VARIANT_MV78200:
743 writel_relaxed(0, mvchip->membase + GPIO_EDGE_CAUSE_OFF);
744 for (cpu = 0; cpu < 2; cpu++) {
745 writel_relaxed(0, mvchip->membase +
746 GPIO_EDGE_MASK_MV78200_OFF(cpu));
747 writel_relaxed(0, mvchip->membase +
748 GPIO_LEVEL_MASK_MV78200_OFF(cpu));
749 }
750 break;
751 case MVEBU_GPIO_SOC_VARIANT_ARMADAXP:
752 writel_relaxed(0, mvchip->membase + GPIO_EDGE_CAUSE_OFF);
753 writel_relaxed(0, mvchip->membase + GPIO_EDGE_MASK_OFF);
754 writel_relaxed(0, mvchip->membase + GPIO_LEVEL_MASK_OFF);
755 for (cpu = 0; cpu < 4; cpu++) {
756 writel_relaxed(0, mvchip->percpu_membase +
757 GPIO_EDGE_CAUSE_ARMADAXP_OFF(cpu));
758 writel_relaxed(0, mvchip->percpu_membase +
759 GPIO_EDGE_MASK_ARMADAXP_OFF(cpu));
760 writel_relaxed(0, mvchip->percpu_membase +
761 GPIO_LEVEL_MASK_ARMADAXP_OFF(cpu));
762 }
763 break;
764 default:
765 BUG();
766 }
767
768 gpiochip_add(&mvchip->chip);
769
770 /* Some gpio controllers do not provide irq support */
771 if (!of_irq_count(np))
772 return 0;
773
774 /* Setup the interrupt handlers. Each chip can have up to 4
775 * interrupt handlers, with each handler dealing with 8 GPIO
776 * pins. */
777 for (i = 0; i < 4; i++) {
778 int irq = platform_get_irq(pdev, i);
779
780 if (irq < 0)
781 continue;
782 irq_set_handler_data(irq, mvchip);
783 irq_set_chained_handler(irq, mvebu_gpio_irq_handler);
784 }
785
786 mvchip->irqbase = irq_alloc_descs(-1, 0, ngpios, -1);
787 if (mvchip->irqbase < 0) {
788 dev_err(&pdev->dev, "no irqs\n");
789 err = mvchip->irqbase;
790 goto err_gpiochip_add;
791 }
792
793 gc = irq_alloc_generic_chip("mvebu_gpio_irq", 2, mvchip->irqbase,
794 mvchip->membase, handle_level_irq);
795 if (!gc) {
796 dev_err(&pdev->dev, "Cannot allocate generic irq_chip\n");
797 err = -ENOMEM;
798 goto err_gpiochip_add;
799 }
800
801 gc->private = mvchip;
802 ct = &gc->chip_types[0];
803 ct->type = IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW;
804 ct->chip.irq_mask = mvebu_gpio_level_irq_mask;
805 ct->chip.irq_unmask = mvebu_gpio_level_irq_unmask;
806 ct->chip.irq_set_type = mvebu_gpio_irq_set_type;
807 ct->chip.name = mvchip->chip.label;
808
809 ct = &gc->chip_types[1];
810 ct->type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING;
811 ct->chip.irq_ack = mvebu_gpio_irq_ack;
812 ct->chip.irq_mask = mvebu_gpio_edge_irq_mask;
813 ct->chip.irq_unmask = mvebu_gpio_edge_irq_unmask;
814 ct->chip.irq_set_type = mvebu_gpio_irq_set_type;
815 ct->handler = handle_edge_irq;
816 ct->chip.name = mvchip->chip.label;
817
818 irq_setup_generic_chip(gc, IRQ_MSK(ngpios), 0,
819 IRQ_NOREQUEST, IRQ_LEVEL | IRQ_NOPROBE);
820
821 /* Setup irq domain on top of the generic chip. */
822 mvchip->domain = irq_domain_add_simple(np, mvchip->chip.ngpio,
823 mvchip->irqbase,
824 &irq_domain_simple_ops,
825 mvchip);
826 if (!mvchip->domain) {
827 dev_err(&pdev->dev, "couldn't allocate irq domain %s (DT).\n",
828 mvchip->chip.label);
829 err = -ENODEV;
830 goto err_generic_chip;
831 }
832
833 return 0;
834
835 err_generic_chip:
836 irq_remove_generic_chip(gc, IRQ_MSK(ngpios), IRQ_NOREQUEST,
837 IRQ_LEVEL | IRQ_NOPROBE);
838 kfree(gc);
839
840 err_gpiochip_add:
841 gpiochip_remove(&mvchip->chip);
842
843 return err;
844 }
845
846 static struct platform_driver mvebu_gpio_driver = {
847 .driver = {
848 .name = "mvebu-gpio",
849 .of_match_table = mvebu_gpio_of_match,
850 },
851 .probe = mvebu_gpio_probe,
852 .suspend = mvebu_gpio_suspend,
853 .resume = mvebu_gpio_resume,
854 };
855 module_platform_driver(mvebu_gpio_driver);
Linux kernel - Deliverables
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