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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
78struct 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 */
100static inline void __iomem *mvebu_gpioreg_out(struct mvebu_gpio_chip *mvchip)
101{
102 return mvchip->membase + GPIO_OUT_OFF;
103}
104
105static inline void __iomem *mvebu_gpioreg_blink(struct mvebu_gpio_chip *mvchip)
106{
107 return mvchip->membase + GPIO_BLINK_EN_OFF;
108}
109
110static inline void __iomem *
111mvebu_gpioreg_io_conf(struct mvebu_gpio_chip *mvchip)
112{
113 return mvchip->membase + GPIO_IO_CONF_OFF;
114}
115
116static inline void __iomem *mvebu_gpioreg_in_pol(struct mvebu_gpio_chip *mvchip)
117{
118 return mvchip->membase + GPIO_IN_POL_OFF;
119}
120
121static inline void __iomem *
122mvebu_gpioreg_data_in(struct mvebu_gpio_chip *mvchip)
123{
124 return mvchip->membase + GPIO_DATA_IN_OFF;
125}
126
127static inline void __iomem *
128mvebu_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
145static inline void __iomem *
146mvebu_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
165static 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
188static 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
204static 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
219static 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
235static 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
257static 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
283static 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 */
292static 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
303static 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
317static 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
331static 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
345static 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
385static 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
445static 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
489static 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
543static 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};
560MODULE_DEVICE_TABLE(of, mvebu_gpio_of_match);
561
562static int mvebu_gpio_suspend(struct platform_device *pdev, pm_message_t state)
563{
564 struct mvebu_gpio_chip *mvchip = platform_get_drvdata(pdev);
565 int i;
566
567 mvchip->out_reg = readl(mvebu_gpioreg_out(mvchip));
568 mvchip->io_conf_reg = readl(mvebu_gpioreg_io_conf(mvchip));
569 mvchip->blink_en_reg = readl(mvebu_gpioreg_blink(mvchip));
570 mvchip->in_pol_reg = readl(mvebu_gpioreg_in_pol(mvchip));
571
572 switch (mvchip->soc_variant) {
573 case MVEBU_GPIO_SOC_VARIANT_ORION:
574 mvchip->edge_mask_regs[0] =
575 readl(mvchip->membase + GPIO_EDGE_MASK_OFF);
576 mvchip->level_mask_regs[0] =
577 readl(mvchip->membase + GPIO_LEVEL_MASK_OFF);
578 break;
579 case MVEBU_GPIO_SOC_VARIANT_MV78200:
580 for (i = 0; i < 2; i++) {
581 mvchip->edge_mask_regs[i] =
582 readl(mvchip->membase +
583 GPIO_EDGE_MASK_MV78200_OFF(i));
584 mvchip->level_mask_regs[i] =
585 readl(mvchip->membase +
586 GPIO_LEVEL_MASK_MV78200_OFF(i));
587 }
588 break;
589 case MVEBU_GPIO_SOC_VARIANT_ARMADAXP:
590 for (i = 0; i < 4; i++) {
591 mvchip->edge_mask_regs[i] =
592 readl(mvchip->membase +
593 GPIO_EDGE_MASK_ARMADAXP_OFF(i));
594 mvchip->level_mask_regs[i] =
595 readl(mvchip->membase +
596 GPIO_LEVEL_MASK_ARMADAXP_OFF(i));
597 }
598 break;
599 default:
600 BUG();
601 }
602
603 return 0;
604}
605
606static int mvebu_gpio_resume(struct platform_device *pdev)
607{
608 struct mvebu_gpio_chip *mvchip = platform_get_drvdata(pdev);
609 int i;
610
611 writel(mvchip->out_reg, mvebu_gpioreg_out(mvchip));
612 writel(mvchip->io_conf_reg, mvebu_gpioreg_io_conf(mvchip));
613 writel(mvchip->blink_en_reg, mvebu_gpioreg_blink(mvchip));
614 writel(mvchip->in_pol_reg, mvebu_gpioreg_in_pol(mvchip));
615
616 switch (mvchip->soc_variant) {
617 case MVEBU_GPIO_SOC_VARIANT_ORION:
618 writel(mvchip->edge_mask_regs[0],
619 mvchip->membase + GPIO_EDGE_MASK_OFF);
620 writel(mvchip->level_mask_regs[0],
621 mvchip->membase + GPIO_LEVEL_MASK_OFF);
622 break;
623 case MVEBU_GPIO_SOC_VARIANT_MV78200:
624 for (i = 0; i < 2; i++) {
625 writel(mvchip->edge_mask_regs[i],
626 mvchip->membase + GPIO_EDGE_MASK_MV78200_OFF(i));
627 writel(mvchip->level_mask_regs[i],
628 mvchip->membase +
629 GPIO_LEVEL_MASK_MV78200_OFF(i));
630 }
631 break;
632 case MVEBU_GPIO_SOC_VARIANT_ARMADAXP:
633 for (i = 0; i < 4; i++) {
634 writel(mvchip->edge_mask_regs[i],
635 mvchip->membase +
636 GPIO_EDGE_MASK_ARMADAXP_OFF(i));
637 writel(mvchip->level_mask_regs[i],
638 mvchip->membase +
639 GPIO_LEVEL_MASK_ARMADAXP_OFF(i));
640 }
641 break;
642 default:
643 BUG();
644 }
645
646 return 0;
647}
648
649static int mvebu_gpio_probe(struct platform_device *pdev)
650{
651 struct mvebu_gpio_chip *mvchip;
652 const struct of_device_id *match;
653 struct device_node *np = pdev->dev.of_node;
654 struct resource *res;
655 struct irq_chip_generic *gc;
656 struct irq_chip_type *ct;
657 struct clk *clk;
658 unsigned int ngpios;
659 int soc_variant;
660 int i, cpu, id;
661 int err;
662
663 match = of_match_device(mvebu_gpio_of_match, &pdev->dev);
664 if (match)
665 soc_variant = (int) match->data;
666 else
667 soc_variant = MVEBU_GPIO_SOC_VARIANT_ORION;
668
669 mvchip = devm_kzalloc(&pdev->dev, sizeof(struct mvebu_gpio_chip),
670 GFP_KERNEL);
671 if (!mvchip)
672 return -ENOMEM;
673
674 platform_set_drvdata(pdev, mvchip);
675
676 if (of_property_read_u32(pdev->dev.of_node, "ngpios", &ngpios)) {
677 dev_err(&pdev->dev, "Missing ngpios OF property\n");
678 return -ENODEV;
679 }
680
681 id = of_alias_get_id(pdev->dev.of_node, "gpio");
682 if (id < 0) {
683 dev_err(&pdev->dev, "Couldn't get OF id\n");
684 return id;
685 }
686
687 clk = devm_clk_get(&pdev->dev, NULL);
688 /* Not all SoCs require a clock.*/
689 if (!IS_ERR(clk))
690 clk_prepare_enable(clk);
691
692 mvchip->soc_variant = soc_variant;
693 mvchip->chip.label = dev_name(&pdev->dev);
694 mvchip->chip.parent = &pdev->dev;
695 mvchip->chip.request = gpiochip_generic_request;
696 mvchip->chip.free = gpiochip_generic_free;
697 mvchip->chip.direction_input = mvebu_gpio_direction_input;
698 mvchip->chip.get = mvebu_gpio_get;
699 mvchip->chip.direction_output = mvebu_gpio_direction_output;
700 mvchip->chip.set = mvebu_gpio_set;
701 mvchip->chip.to_irq = mvebu_gpio_to_irq;
702 mvchip->chip.base = id * MVEBU_MAX_GPIO_PER_BANK;
703 mvchip->chip.ngpio = ngpios;
704 mvchip->chip.can_sleep = false;
705 mvchip->chip.of_node = np;
706 mvchip->chip.dbg_show = mvebu_gpio_dbg_show;
707
708 spin_lock_init(&mvchip->lock);
709 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
710 mvchip->membase = devm_ioremap_resource(&pdev->dev, res);
711 if (IS_ERR(mvchip->membase))
712 return PTR_ERR(mvchip->membase);
713
714 /* The Armada XP has a second range of registers for the
715 * per-CPU registers */
716 if (soc_variant == MVEBU_GPIO_SOC_VARIANT_ARMADAXP) {
717 res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
718 mvchip->percpu_membase = devm_ioremap_resource(&pdev->dev,
719 res);
720 if (IS_ERR(mvchip->percpu_membase))
721 return PTR_ERR(mvchip->percpu_membase);
722 }
723
724 /*
725 * Mask and clear GPIO interrupts.
726 */
727 switch (soc_variant) {
728 case MVEBU_GPIO_SOC_VARIANT_ORION:
729 writel_relaxed(0, mvchip->membase + GPIO_EDGE_CAUSE_OFF);
730 writel_relaxed(0, mvchip->membase + GPIO_EDGE_MASK_OFF);
731 writel_relaxed(0, mvchip->membase + GPIO_LEVEL_MASK_OFF);
732 break;
733 case MVEBU_GPIO_SOC_VARIANT_MV78200:
734 writel_relaxed(0, mvchip->membase + GPIO_EDGE_CAUSE_OFF);
735 for (cpu = 0; cpu < 2; cpu++) {
736 writel_relaxed(0, mvchip->membase +
737 GPIO_EDGE_MASK_MV78200_OFF(cpu));
738 writel_relaxed(0, mvchip->membase +
739 GPIO_LEVEL_MASK_MV78200_OFF(cpu));
740 }
741 break;
742 case MVEBU_GPIO_SOC_VARIANT_ARMADAXP:
743 writel_relaxed(0, mvchip->membase + GPIO_EDGE_CAUSE_OFF);
744 writel_relaxed(0, mvchip->membase + GPIO_EDGE_MASK_OFF);
745 writel_relaxed(0, mvchip->membase + GPIO_LEVEL_MASK_OFF);
746 for (cpu = 0; cpu < 4; cpu++) {
747 writel_relaxed(0, mvchip->percpu_membase +
748 GPIO_EDGE_CAUSE_ARMADAXP_OFF(cpu));
749 writel_relaxed(0, mvchip->percpu_membase +
750 GPIO_EDGE_MASK_ARMADAXP_OFF(cpu));
751 writel_relaxed(0, mvchip->percpu_membase +
752 GPIO_LEVEL_MASK_ARMADAXP_OFF(cpu));
753 }
754 break;
755 default:
756 BUG();
757 }
758
759 devm_gpiochip_add_data(&pdev->dev, &mvchip->chip, mvchip);
760
761 /* Some gpio controllers do not provide irq support */
762 if (!of_irq_count(np))
763 return 0;
764
765 /* Setup the interrupt handlers. Each chip can have up to 4
766 * interrupt handlers, with each handler dealing with 8 GPIO
767 * pins. */
768 for (i = 0; i < 4; i++) {
769 int irq = platform_get_irq(pdev, i);
770
771 if (irq < 0)
772 continue;
773 irq_set_chained_handler_and_data(irq, mvebu_gpio_irq_handler,
774 mvchip);
775 }
776
777 mvchip->irqbase = irq_alloc_descs(-1, 0, ngpios, -1);
778 if (mvchip->irqbase < 0) {
779 dev_err(&pdev->dev, "no irqs\n");
780 return mvchip->irqbase;
781 }
782
783 gc = irq_alloc_generic_chip("mvebu_gpio_irq", 2, mvchip->irqbase,
784 mvchip->membase, handle_level_irq);
785 if (!gc) {
786 dev_err(&pdev->dev, "Cannot allocate generic irq_chip\n");
787 return -ENOMEM;
788 }
789
790 gc->private = mvchip;
791 ct = &gc->chip_types[0];
792 ct->type = IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW;
793 ct->chip.irq_mask = mvebu_gpio_level_irq_mask;
794 ct->chip.irq_unmask = mvebu_gpio_level_irq_unmask;
795 ct->chip.irq_set_type = mvebu_gpio_irq_set_type;
796 ct->chip.name = mvchip->chip.label;
797
798 ct = &gc->chip_types[1];
799 ct->type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING;
800 ct->chip.irq_ack = mvebu_gpio_irq_ack;
801 ct->chip.irq_mask = mvebu_gpio_edge_irq_mask;
802 ct->chip.irq_unmask = mvebu_gpio_edge_irq_unmask;
803 ct->chip.irq_set_type = mvebu_gpio_irq_set_type;
804 ct->handler = handle_edge_irq;
805 ct->chip.name = mvchip->chip.label;
806
807 irq_setup_generic_chip(gc, IRQ_MSK(ngpios), 0,
808 IRQ_NOREQUEST, IRQ_LEVEL | IRQ_NOPROBE);
809
810 /* Setup irq domain on top of the generic chip. */
811 mvchip->domain = irq_domain_add_simple(np, mvchip->chip.ngpio,
812 mvchip->irqbase,
813 &irq_domain_simple_ops,
814 mvchip);
815 if (!mvchip->domain) {
816 dev_err(&pdev->dev, "couldn't allocate irq domain %s (DT).\n",
817 mvchip->chip.label);
818 err = -ENODEV;
819 goto err_generic_chip;
820 }
821
822 return 0;
823
824err_generic_chip:
825 irq_remove_generic_chip(gc, IRQ_MSK(ngpios), IRQ_NOREQUEST,
826 IRQ_LEVEL | IRQ_NOPROBE);
827 kfree(gc);
828
829 return err;
830}
831
832static struct platform_driver mvebu_gpio_driver = {
833 .driver = {
834 .name = "mvebu-gpio",
835 .of_match_table = mvebu_gpio_of_match,
836 },
837 .probe = mvebu_gpio_probe,
838 .suspend = mvebu_gpio_suspend,
839 .resume = mvebu_gpio_resume,
840};
841module_platform_driver(mvebu_gpio_driver);
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/bitops.h>
37#include <linux/clk.h>
38#include <linux/err.h>
39#include <linux/gpio/driver.h>
40#include <linux/gpio/consumer.h>
41#include <linux/gpio/machine.h>
42#include <linux/init.h>
43#include <linux/io.h>
44#include <linux/irq.h>
45#include <linux/irqchip/chained_irq.h>
46#include <linux/irqdomain.h>
47#include <linux/mfd/syscon.h>
48#include <linux/of_device.h>
49#include <linux/pinctrl/consumer.h>
50#include <linux/platform_device.h>
51#include <linux/pwm.h>
52#include <linux/regmap.h>
53#include <linux/slab.h>
54
55/*
56 * GPIO unit register offsets.
57 */
58#define GPIO_OUT_OFF 0x0000
59#define GPIO_IO_CONF_OFF 0x0004
60#define GPIO_BLINK_EN_OFF 0x0008
61#define GPIO_IN_POL_OFF 0x000c
62#define GPIO_DATA_IN_OFF 0x0010
63#define GPIO_EDGE_CAUSE_OFF 0x0014
64#define GPIO_EDGE_MASK_OFF 0x0018
65#define GPIO_LEVEL_MASK_OFF 0x001c
66#define GPIO_BLINK_CNT_SELECT_OFF 0x0020
67
68/*
69 * PWM register offsets.
70 */
71#define PWM_BLINK_ON_DURATION_OFF 0x0
72#define PWM_BLINK_OFF_DURATION_OFF 0x4
73#define PWM_BLINK_COUNTER_B_OFF 0x8
74
75/* Armada 8k variant gpios register offsets */
76#define AP80X_GPIO0_OFF_A8K 0x1040
77#define CP11X_GPIO0_OFF_A8K 0x100
78#define CP11X_GPIO1_OFF_A8K 0x140
79
80/* The MV78200 has per-CPU registers for edge mask and level mask */
81#define GPIO_EDGE_MASK_MV78200_OFF(cpu) ((cpu) ? 0x30 : 0x18)
82#define GPIO_LEVEL_MASK_MV78200_OFF(cpu) ((cpu) ? 0x34 : 0x1C)
83
84/*
85 * The Armada XP has per-CPU registers for interrupt cause, interrupt
86 * mask and interrupt level mask. Those are in percpu_regs range.
87 */
88#define GPIO_EDGE_CAUSE_ARMADAXP_OFF(cpu) ((cpu) * 0x4)
89#define GPIO_EDGE_MASK_ARMADAXP_OFF(cpu) (0x10 + (cpu) * 0x4)
90#define GPIO_LEVEL_MASK_ARMADAXP_OFF(cpu) (0x20 + (cpu) * 0x4)
91
92#define MVEBU_GPIO_SOC_VARIANT_ORION 0x1
93#define MVEBU_GPIO_SOC_VARIANT_MV78200 0x2
94#define MVEBU_GPIO_SOC_VARIANT_ARMADAXP 0x3
95#define MVEBU_GPIO_SOC_VARIANT_A8K 0x4
96
97#define MVEBU_MAX_GPIO_PER_BANK 32
98
99struct mvebu_pwm {
100 struct regmap *regs;
101 u32 offset;
102 unsigned long clk_rate;
103 struct gpio_desc *gpiod;
104 struct pwm_chip chip;
105 spinlock_t lock;
106 struct mvebu_gpio_chip *mvchip;
107
108 /* Used to preserve GPIO/PWM registers across suspend/resume */
109 u32 blink_select;
110 u32 blink_on_duration;
111 u32 blink_off_duration;
112};
113
114struct mvebu_gpio_chip {
115 struct gpio_chip chip;
116 struct regmap *regs;
117 u32 offset;
118 struct regmap *percpu_regs;
119 int irqbase;
120 struct irq_domain *domain;
121 int soc_variant;
122
123 /* Used for PWM support */
124 struct clk *clk;
125 struct mvebu_pwm *mvpwm;
126
127 /* Used to preserve GPIO registers across suspend/resume */
128 u32 out_reg;
129 u32 io_conf_reg;
130 u32 blink_en_reg;
131 u32 in_pol_reg;
132 u32 edge_mask_regs[4];
133 u32 level_mask_regs[4];
134};
135
136/*
137 * Functions returning addresses of individual registers for a given
138 * GPIO controller.
139 */
140
141static void mvebu_gpioreg_edge_cause(struct mvebu_gpio_chip *mvchip,
142 struct regmap **map, unsigned int *offset)
143{
144 int cpu;
145
146 switch (mvchip->soc_variant) {
147 case MVEBU_GPIO_SOC_VARIANT_ORION:
148 case MVEBU_GPIO_SOC_VARIANT_MV78200:
149 case MVEBU_GPIO_SOC_VARIANT_A8K:
150 *map = mvchip->regs;
151 *offset = GPIO_EDGE_CAUSE_OFF + mvchip->offset;
152 break;
153 case MVEBU_GPIO_SOC_VARIANT_ARMADAXP:
154 cpu = smp_processor_id();
155 *map = mvchip->percpu_regs;
156 *offset = GPIO_EDGE_CAUSE_ARMADAXP_OFF(cpu);
157 break;
158 default:
159 BUG();
160 }
161}
162
163static u32
164mvebu_gpio_read_edge_cause(struct mvebu_gpio_chip *mvchip)
165{
166 struct regmap *map;
167 unsigned int offset;
168 u32 val;
169
170 mvebu_gpioreg_edge_cause(mvchip, &map, &offset);
171 regmap_read(map, offset, &val);
172
173 return val;
174}
175
176static void
177mvebu_gpio_write_edge_cause(struct mvebu_gpio_chip *mvchip, u32 val)
178{
179 struct regmap *map;
180 unsigned int offset;
181
182 mvebu_gpioreg_edge_cause(mvchip, &map, &offset);
183 regmap_write(map, offset, val);
184}
185
186static inline void
187mvebu_gpioreg_edge_mask(struct mvebu_gpio_chip *mvchip,
188 struct regmap **map, unsigned int *offset)
189{
190 int cpu;
191
192 switch (mvchip->soc_variant) {
193 case MVEBU_GPIO_SOC_VARIANT_ORION:
194 case MVEBU_GPIO_SOC_VARIANT_A8K:
195 *map = mvchip->regs;
196 *offset = GPIO_EDGE_MASK_OFF + mvchip->offset;
197 break;
198 case MVEBU_GPIO_SOC_VARIANT_MV78200:
199 cpu = smp_processor_id();
200 *map = mvchip->regs;
201 *offset = GPIO_EDGE_MASK_MV78200_OFF(cpu);
202 break;
203 case MVEBU_GPIO_SOC_VARIANT_ARMADAXP:
204 cpu = smp_processor_id();
205 *map = mvchip->percpu_regs;
206 *offset = GPIO_EDGE_MASK_ARMADAXP_OFF(cpu);
207 break;
208 default:
209 BUG();
210 }
211}
212
213static u32
214mvebu_gpio_read_edge_mask(struct mvebu_gpio_chip *mvchip)
215{
216 struct regmap *map;
217 unsigned int offset;
218 u32 val;
219
220 mvebu_gpioreg_edge_mask(mvchip, &map, &offset);
221 regmap_read(map, offset, &val);
222
223 return val;
224}
225
226static void
227mvebu_gpio_write_edge_mask(struct mvebu_gpio_chip *mvchip, u32 val)
228{
229 struct regmap *map;
230 unsigned int offset;
231
232 mvebu_gpioreg_edge_mask(mvchip, &map, &offset);
233 regmap_write(map, offset, val);
234}
235
236static void
237mvebu_gpioreg_level_mask(struct mvebu_gpio_chip *mvchip,
238 struct regmap **map, unsigned int *offset)
239{
240 int cpu;
241
242 switch (mvchip->soc_variant) {
243 case MVEBU_GPIO_SOC_VARIANT_ORION:
244 case MVEBU_GPIO_SOC_VARIANT_A8K:
245 *map = mvchip->regs;
246 *offset = GPIO_LEVEL_MASK_OFF + mvchip->offset;
247 break;
248 case MVEBU_GPIO_SOC_VARIANT_MV78200:
249 cpu = smp_processor_id();
250 *map = mvchip->regs;
251 *offset = GPIO_LEVEL_MASK_MV78200_OFF(cpu);
252 break;
253 case MVEBU_GPIO_SOC_VARIANT_ARMADAXP:
254 cpu = smp_processor_id();
255 *map = mvchip->percpu_regs;
256 *offset = GPIO_LEVEL_MASK_ARMADAXP_OFF(cpu);
257 break;
258 default:
259 BUG();
260 }
261}
262
263static u32
264mvebu_gpio_read_level_mask(struct mvebu_gpio_chip *mvchip)
265{
266 struct regmap *map;
267 unsigned int offset;
268 u32 val;
269
270 mvebu_gpioreg_level_mask(mvchip, &map, &offset);
271 regmap_read(map, offset, &val);
272
273 return val;
274}
275
276static void
277mvebu_gpio_write_level_mask(struct mvebu_gpio_chip *mvchip, u32 val)
278{
279 struct regmap *map;
280 unsigned int offset;
281
282 mvebu_gpioreg_level_mask(mvchip, &map, &offset);
283 regmap_write(map, offset, val);
284}
285
286/*
287 * Functions returning offsets of individual registers for a given
288 * PWM controller.
289 */
290static unsigned int mvebu_pwmreg_blink_on_duration(struct mvebu_pwm *mvpwm)
291{
292 return mvpwm->offset + PWM_BLINK_ON_DURATION_OFF;
293}
294
295static unsigned int mvebu_pwmreg_blink_off_duration(struct mvebu_pwm *mvpwm)
296{
297 return mvpwm->offset + PWM_BLINK_OFF_DURATION_OFF;
298}
299
300/*
301 * Functions implementing the gpio_chip methods
302 */
303static void mvebu_gpio_set(struct gpio_chip *chip, unsigned int pin, int value)
304{
305 struct mvebu_gpio_chip *mvchip = gpiochip_get_data(chip);
306
307 regmap_update_bits(mvchip->regs, GPIO_OUT_OFF + mvchip->offset,
308 BIT(pin), value ? BIT(pin) : 0);
309}
310
311static int mvebu_gpio_get(struct gpio_chip *chip, unsigned int pin)
312{
313 struct mvebu_gpio_chip *mvchip = gpiochip_get_data(chip);
314 u32 u;
315
316 regmap_read(mvchip->regs, GPIO_IO_CONF_OFF + mvchip->offset, &u);
317
318 if (u & BIT(pin)) {
319 u32 data_in, in_pol;
320
321 regmap_read(mvchip->regs, GPIO_DATA_IN_OFF + mvchip->offset,
322 &data_in);
323 regmap_read(mvchip->regs, GPIO_IN_POL_OFF + mvchip->offset,
324 &in_pol);
325 u = data_in ^ in_pol;
326 } else {
327 regmap_read(mvchip->regs, GPIO_OUT_OFF + mvchip->offset, &u);
328 }
329
330 return (u >> pin) & 1;
331}
332
333static void mvebu_gpio_blink(struct gpio_chip *chip, unsigned int pin,
334 int value)
335{
336 struct mvebu_gpio_chip *mvchip = gpiochip_get_data(chip);
337
338 regmap_update_bits(mvchip->regs, GPIO_BLINK_EN_OFF + mvchip->offset,
339 BIT(pin), value ? BIT(pin) : 0);
340}
341
342static int mvebu_gpio_direction_input(struct gpio_chip *chip, unsigned int pin)
343{
344 struct mvebu_gpio_chip *mvchip = gpiochip_get_data(chip);
345 int ret;
346
347 /*
348 * Check with the pinctrl driver whether this pin is usable as
349 * an input GPIO
350 */
351 ret = pinctrl_gpio_direction_input(chip->base + pin);
352 if (ret)
353 return ret;
354
355 regmap_update_bits(mvchip->regs, GPIO_IO_CONF_OFF + mvchip->offset,
356 BIT(pin), BIT(pin));
357
358 return 0;
359}
360
361static int mvebu_gpio_direction_output(struct gpio_chip *chip, unsigned int pin,
362 int value)
363{
364 struct mvebu_gpio_chip *mvchip = gpiochip_get_data(chip);
365 int ret;
366
367 /*
368 * Check with the pinctrl driver whether this pin is usable as
369 * an output GPIO
370 */
371 ret = pinctrl_gpio_direction_output(chip->base + pin);
372 if (ret)
373 return ret;
374
375 mvebu_gpio_blink(chip, pin, 0);
376 mvebu_gpio_set(chip, pin, value);
377
378 regmap_update_bits(mvchip->regs, GPIO_IO_CONF_OFF + mvchip->offset,
379 BIT(pin), 0);
380
381 return 0;
382}
383
384static int mvebu_gpio_get_direction(struct gpio_chip *chip, unsigned int pin)
385{
386 struct mvebu_gpio_chip *mvchip = gpiochip_get_data(chip);
387 u32 u;
388
389 regmap_read(mvchip->regs, GPIO_IO_CONF_OFF + mvchip->offset, &u);
390
391 if (u & BIT(pin))
392 return GPIO_LINE_DIRECTION_IN;
393
394 return GPIO_LINE_DIRECTION_OUT;
395}
396
397static int mvebu_gpio_to_irq(struct gpio_chip *chip, unsigned int pin)
398{
399 struct mvebu_gpio_chip *mvchip = gpiochip_get_data(chip);
400
401 return irq_create_mapping(mvchip->domain, pin);
402}
403
404/*
405 * Functions implementing the irq_chip methods
406 */
407static void mvebu_gpio_irq_ack(struct irq_data *d)
408{
409 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
410 struct mvebu_gpio_chip *mvchip = gc->private;
411 u32 mask = d->mask;
412
413 irq_gc_lock(gc);
414 mvebu_gpio_write_edge_cause(mvchip, ~mask);
415 irq_gc_unlock(gc);
416}
417
418static void mvebu_gpio_edge_irq_mask(struct irq_data *d)
419{
420 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
421 struct mvebu_gpio_chip *mvchip = gc->private;
422 struct irq_chip_type *ct = irq_data_get_chip_type(d);
423 u32 mask = d->mask;
424
425 irq_gc_lock(gc);
426 ct->mask_cache_priv &= ~mask;
427 mvebu_gpio_write_edge_mask(mvchip, ct->mask_cache_priv);
428 irq_gc_unlock(gc);
429}
430
431static void mvebu_gpio_edge_irq_unmask(struct irq_data *d)
432{
433 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
434 struct mvebu_gpio_chip *mvchip = gc->private;
435 struct irq_chip_type *ct = irq_data_get_chip_type(d);
436 u32 mask = d->mask;
437
438 irq_gc_lock(gc);
439 mvebu_gpio_write_edge_cause(mvchip, ~mask);
440 ct->mask_cache_priv |= mask;
441 mvebu_gpio_write_edge_mask(mvchip, ct->mask_cache_priv);
442 irq_gc_unlock(gc);
443}
444
445static void mvebu_gpio_level_irq_mask(struct irq_data *d)
446{
447 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
448 struct mvebu_gpio_chip *mvchip = gc->private;
449 struct irq_chip_type *ct = irq_data_get_chip_type(d);
450 u32 mask = d->mask;
451
452 irq_gc_lock(gc);
453 ct->mask_cache_priv &= ~mask;
454 mvebu_gpio_write_level_mask(mvchip, ct->mask_cache_priv);
455 irq_gc_unlock(gc);
456}
457
458static void mvebu_gpio_level_irq_unmask(struct irq_data *d)
459{
460 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
461 struct mvebu_gpio_chip *mvchip = gc->private;
462 struct irq_chip_type *ct = irq_data_get_chip_type(d);
463 u32 mask = d->mask;
464
465 irq_gc_lock(gc);
466 ct->mask_cache_priv |= mask;
467 mvebu_gpio_write_level_mask(mvchip, ct->mask_cache_priv);
468 irq_gc_unlock(gc);
469}
470
471/*****************************************************************************
472 * MVEBU GPIO IRQ
473 *
474 * GPIO_IN_POL register controls whether GPIO_DATA_IN will hold the same
475 * value of the line or the opposite value.
476 *
477 * Level IRQ handlers: DATA_IN is used directly as cause register.
478 * Interrupt are masked by LEVEL_MASK registers.
479 * Edge IRQ handlers: Change in DATA_IN are latched in EDGE_CAUSE.
480 * Interrupt are masked by EDGE_MASK registers.
481 * Both-edge handlers: Similar to regular Edge handlers, but also swaps
482 * the polarity to catch the next line transaction.
483 * This is a race condition that might not perfectly
484 * work on some use cases.
485 *
486 * Every eight GPIO lines are grouped (OR'ed) before going up to main
487 * cause register.
488 *
489 * EDGE cause mask
490 * data-in /--------| |-----| |----\
491 * -----| |----- ---- to main cause reg
492 * X \----------------| |----/
493 * polarity LEVEL mask
494 *
495 ****************************************************************************/
496
497static int mvebu_gpio_irq_set_type(struct irq_data *d, unsigned int type)
498{
499 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
500 struct irq_chip_type *ct = irq_data_get_chip_type(d);
501 struct mvebu_gpio_chip *mvchip = gc->private;
502 int pin;
503 u32 u;
504
505 pin = d->hwirq;
506
507 regmap_read(mvchip->regs, GPIO_IO_CONF_OFF + mvchip->offset, &u);
508 if ((u & BIT(pin)) == 0)
509 return -EINVAL;
510
511 type &= IRQ_TYPE_SENSE_MASK;
512 if (type == IRQ_TYPE_NONE)
513 return -EINVAL;
514
515 /* Check if we need to change chip and handler */
516 if (!(ct->type & type))
517 if (irq_setup_alt_chip(d, type))
518 return -EINVAL;
519
520 /*
521 * Configure interrupt polarity.
522 */
523 switch (type) {
524 case IRQ_TYPE_EDGE_RISING:
525 case IRQ_TYPE_LEVEL_HIGH:
526 regmap_update_bits(mvchip->regs,
527 GPIO_IN_POL_OFF + mvchip->offset,
528 BIT(pin), 0);
529 break;
530 case IRQ_TYPE_EDGE_FALLING:
531 case IRQ_TYPE_LEVEL_LOW:
532 regmap_update_bits(mvchip->regs,
533 GPIO_IN_POL_OFF + mvchip->offset,
534 BIT(pin), BIT(pin));
535 break;
536 case IRQ_TYPE_EDGE_BOTH: {
537 u32 data_in, in_pol, val;
538
539 regmap_read(mvchip->regs,
540 GPIO_IN_POL_OFF + mvchip->offset, &in_pol);
541 regmap_read(mvchip->regs,
542 GPIO_DATA_IN_OFF + mvchip->offset, &data_in);
543
544 /*
545 * set initial polarity based on current input level
546 */
547 if ((data_in ^ in_pol) & BIT(pin))
548 val = BIT(pin); /* falling */
549 else
550 val = 0; /* raising */
551
552 regmap_update_bits(mvchip->regs,
553 GPIO_IN_POL_OFF + mvchip->offset,
554 BIT(pin), val);
555 break;
556 }
557 }
558 return 0;
559}
560
561static void mvebu_gpio_irq_handler(struct irq_desc *desc)
562{
563 struct mvebu_gpio_chip *mvchip = irq_desc_get_handler_data(desc);
564 struct irq_chip *chip = irq_desc_get_chip(desc);
565 u32 cause, type, data_in, level_mask, edge_cause, edge_mask;
566 int i;
567
568 if (mvchip == NULL)
569 return;
570
571 chained_irq_enter(chip, desc);
572
573 regmap_read(mvchip->regs, GPIO_DATA_IN_OFF + mvchip->offset, &data_in);
574 level_mask = mvebu_gpio_read_level_mask(mvchip);
575 edge_cause = mvebu_gpio_read_edge_cause(mvchip);
576 edge_mask = mvebu_gpio_read_edge_mask(mvchip);
577
578 cause = (data_in & level_mask) | (edge_cause & edge_mask);
579
580 for (i = 0; i < mvchip->chip.ngpio; i++) {
581 int irq;
582
583 irq = irq_find_mapping(mvchip->domain, i);
584
585 if (!(cause & BIT(i)))
586 continue;
587
588 type = irq_get_trigger_type(irq);
589 if ((type & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_BOTH) {
590 /* Swap polarity (race with GPIO line) */
591 u32 polarity;
592
593 regmap_read(mvchip->regs,
594 GPIO_IN_POL_OFF + mvchip->offset,
595 &polarity);
596 polarity ^= BIT(i);
597 regmap_write(mvchip->regs,
598 GPIO_IN_POL_OFF + mvchip->offset,
599 polarity);
600 }
601
602 generic_handle_irq(irq);
603 }
604
605 chained_irq_exit(chip, desc);
606}
607
608static const struct regmap_config mvebu_gpio_regmap_config = {
609 .reg_bits = 32,
610 .reg_stride = 4,
611 .val_bits = 32,
612 .fast_io = true,
613};
614
615/*
616 * Functions implementing the pwm_chip methods
617 */
618static struct mvebu_pwm *to_mvebu_pwm(struct pwm_chip *chip)
619{
620 return container_of(chip, struct mvebu_pwm, chip);
621}
622
623static int mvebu_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
624{
625 struct mvebu_pwm *mvpwm = to_mvebu_pwm(chip);
626 struct mvebu_gpio_chip *mvchip = mvpwm->mvchip;
627 struct gpio_desc *desc;
628 unsigned long flags;
629 int ret = 0;
630
631 spin_lock_irqsave(&mvpwm->lock, flags);
632
633 if (mvpwm->gpiod) {
634 ret = -EBUSY;
635 } else {
636 desc = gpiochip_request_own_desc(&mvchip->chip,
637 pwm->hwpwm, "mvebu-pwm",
638 GPIO_ACTIVE_HIGH,
639 GPIOD_OUT_LOW);
640 if (IS_ERR(desc)) {
641 ret = PTR_ERR(desc);
642 goto out;
643 }
644
645 mvpwm->gpiod = desc;
646 }
647out:
648 spin_unlock_irqrestore(&mvpwm->lock, flags);
649 return ret;
650}
651
652static void mvebu_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
653{
654 struct mvebu_pwm *mvpwm = to_mvebu_pwm(chip);
655 unsigned long flags;
656
657 spin_lock_irqsave(&mvpwm->lock, flags);
658 gpiochip_free_own_desc(mvpwm->gpiod);
659 mvpwm->gpiod = NULL;
660 spin_unlock_irqrestore(&mvpwm->lock, flags);
661}
662
663static void mvebu_pwm_get_state(struct pwm_chip *chip,
664 struct pwm_device *pwm,
665 struct pwm_state *state) {
666
667 struct mvebu_pwm *mvpwm = to_mvebu_pwm(chip);
668 struct mvebu_gpio_chip *mvchip = mvpwm->mvchip;
669 unsigned long long val;
670 unsigned long flags;
671 u32 u;
672
673 spin_lock_irqsave(&mvpwm->lock, flags);
674
675 regmap_read(mvpwm->regs, mvebu_pwmreg_blink_on_duration(mvpwm), &u);
676 /* Hardware treats zero as 2^32. See mvebu_pwm_apply(). */
677 if (u > 0)
678 val = u;
679 else
680 val = UINT_MAX + 1ULL;
681 state->duty_cycle = DIV_ROUND_UP_ULL(val * NSEC_PER_SEC,
682 mvpwm->clk_rate);
683
684 regmap_read(mvpwm->regs, mvebu_pwmreg_blink_off_duration(mvpwm), &u);
685 /* period = on + off duration */
686 if (u > 0)
687 val += u;
688 else
689 val += UINT_MAX + 1ULL;
690 state->period = DIV_ROUND_UP_ULL(val * NSEC_PER_SEC, mvpwm->clk_rate);
691
692 regmap_read(mvchip->regs, GPIO_BLINK_EN_OFF + mvchip->offset, &u);
693 if (u)
694 state->enabled = true;
695 else
696 state->enabled = false;
697
698 spin_unlock_irqrestore(&mvpwm->lock, flags);
699}
700
701static int mvebu_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
702 const struct pwm_state *state)
703{
704 struct mvebu_pwm *mvpwm = to_mvebu_pwm(chip);
705 struct mvebu_gpio_chip *mvchip = mvpwm->mvchip;
706 unsigned long long val;
707 unsigned long flags;
708 unsigned int on, off;
709
710 val = (unsigned long long) mvpwm->clk_rate * state->duty_cycle;
711 do_div(val, NSEC_PER_SEC);
712 if (val > UINT_MAX + 1ULL)
713 return -EINVAL;
714 /*
715 * Zero on/off values don't work as expected. Experimentation shows
716 * that zero value is treated as 2^32. This behavior is not documented.
717 */
718 if (val == UINT_MAX + 1ULL)
719 on = 0;
720 else if (val)
721 on = val;
722 else
723 on = 1;
724
725 val = (unsigned long long) mvpwm->clk_rate * state->period;
726 do_div(val, NSEC_PER_SEC);
727 val -= on;
728 if (val > UINT_MAX + 1ULL)
729 return -EINVAL;
730 if (val == UINT_MAX + 1ULL)
731 off = 0;
732 else if (val)
733 off = val;
734 else
735 off = 1;
736
737 spin_lock_irqsave(&mvpwm->lock, flags);
738
739 regmap_write(mvpwm->regs, mvebu_pwmreg_blink_on_duration(mvpwm), on);
740 regmap_write(mvpwm->regs, mvebu_pwmreg_blink_off_duration(mvpwm), off);
741 if (state->enabled)
742 mvebu_gpio_blink(&mvchip->chip, pwm->hwpwm, 1);
743 else
744 mvebu_gpio_blink(&mvchip->chip, pwm->hwpwm, 0);
745
746 spin_unlock_irqrestore(&mvpwm->lock, flags);
747
748 return 0;
749}
750
751static const struct pwm_ops mvebu_pwm_ops = {
752 .request = mvebu_pwm_request,
753 .free = mvebu_pwm_free,
754 .get_state = mvebu_pwm_get_state,
755 .apply = mvebu_pwm_apply,
756 .owner = THIS_MODULE,
757};
758
759static void __maybe_unused mvebu_pwm_suspend(struct mvebu_gpio_chip *mvchip)
760{
761 struct mvebu_pwm *mvpwm = mvchip->mvpwm;
762
763 regmap_read(mvchip->regs, GPIO_BLINK_CNT_SELECT_OFF + mvchip->offset,
764 &mvpwm->blink_select);
765 regmap_read(mvpwm->regs, mvebu_pwmreg_blink_on_duration(mvpwm),
766 &mvpwm->blink_on_duration);
767 regmap_read(mvpwm->regs, mvebu_pwmreg_blink_off_duration(mvpwm),
768 &mvpwm->blink_off_duration);
769}
770
771static void __maybe_unused mvebu_pwm_resume(struct mvebu_gpio_chip *mvchip)
772{
773 struct mvebu_pwm *mvpwm = mvchip->mvpwm;
774
775 regmap_write(mvchip->regs, GPIO_BLINK_CNT_SELECT_OFF + mvchip->offset,
776 mvpwm->blink_select);
777 regmap_write(mvpwm->regs, mvebu_pwmreg_blink_on_duration(mvpwm),
778 mvpwm->blink_on_duration);
779 regmap_write(mvpwm->regs, mvebu_pwmreg_blink_off_duration(mvpwm),
780 mvpwm->blink_off_duration);
781}
782
783static int mvebu_pwm_probe(struct platform_device *pdev,
784 struct mvebu_gpio_chip *mvchip,
785 int id)
786{
787 struct device *dev = &pdev->dev;
788 struct mvebu_pwm *mvpwm;
789 void __iomem *base;
790 u32 offset;
791 u32 set;
792
793 if (of_device_is_compatible(mvchip->chip.of_node,
794 "marvell,armada-370-gpio")) {
795 /*
796 * There are only two sets of PWM configuration registers for
797 * all the GPIO lines on those SoCs which this driver reserves
798 * for the first two GPIO chips. So if the resource is missing
799 * we can't treat it as an error.
800 */
801 if (!platform_get_resource_byname(pdev, IORESOURCE_MEM, "pwm"))
802 return 0;
803 offset = 0;
804 } else if (mvchip->soc_variant == MVEBU_GPIO_SOC_VARIANT_A8K) {
805 int ret = of_property_read_u32(dev->of_node,
806 "marvell,pwm-offset", &offset);
807 if (ret < 0)
808 return 0;
809 } else {
810 return 0;
811 }
812
813 if (IS_ERR(mvchip->clk))
814 return PTR_ERR(mvchip->clk);
815
816 mvpwm = devm_kzalloc(dev, sizeof(struct mvebu_pwm), GFP_KERNEL);
817 if (!mvpwm)
818 return -ENOMEM;
819 mvchip->mvpwm = mvpwm;
820 mvpwm->mvchip = mvchip;
821 mvpwm->offset = offset;
822
823 if (mvchip->soc_variant == MVEBU_GPIO_SOC_VARIANT_A8K) {
824 mvpwm->regs = mvchip->regs;
825
826 switch (mvchip->offset) {
827 case AP80X_GPIO0_OFF_A8K:
828 case CP11X_GPIO0_OFF_A8K:
829 /* Blink counter A */
830 set = 0;
831 break;
832 case CP11X_GPIO1_OFF_A8K:
833 /* Blink counter B */
834 set = U32_MAX;
835 mvpwm->offset += PWM_BLINK_COUNTER_B_OFF;
836 break;
837 default:
838 return -EINVAL;
839 }
840 } else {
841 base = devm_platform_ioremap_resource_byname(pdev, "pwm");
842 if (IS_ERR(base))
843 return PTR_ERR(base);
844
845 mvpwm->regs = devm_regmap_init_mmio(&pdev->dev, base,
846 &mvebu_gpio_regmap_config);
847 if (IS_ERR(mvpwm->regs))
848 return PTR_ERR(mvpwm->regs);
849
850 /*
851 * Use set A for lines of GPIO chip with id 0, B for GPIO chip
852 * with id 1. Don't allow further GPIO chips to be used for PWM.
853 */
854 if (id == 0)
855 set = 0;
856 else if (id == 1)
857 set = U32_MAX;
858 else
859 return -EINVAL;
860 }
861
862 regmap_write(mvchip->regs,
863 GPIO_BLINK_CNT_SELECT_OFF + mvchip->offset, set);
864
865 mvpwm->clk_rate = clk_get_rate(mvchip->clk);
866 if (!mvpwm->clk_rate) {
867 dev_err(dev, "failed to get clock rate\n");
868 return -EINVAL;
869 }
870
871 mvpwm->chip.dev = dev;
872 mvpwm->chip.ops = &mvebu_pwm_ops;
873 mvpwm->chip.npwm = mvchip->chip.ngpio;
874 /*
875 * There may already be some PWM allocated, so we can't force
876 * mvpwm->chip.base to a fixed point like mvchip->chip.base.
877 * So, we let pwmchip_add() do the numbering and take the next free
878 * region.
879 */
880 mvpwm->chip.base = -1;
881
882 spin_lock_init(&mvpwm->lock);
883
884 return pwmchip_add(&mvpwm->chip);
885}
886
887#ifdef CONFIG_DEBUG_FS
888#include <linux/seq_file.h>
889
890static void mvebu_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
891{
892 struct mvebu_gpio_chip *mvchip = gpiochip_get_data(chip);
893 u32 out, io_conf, blink, in_pol, data_in, cause, edg_msk, lvl_msk;
894 const char *label;
895 int i;
896
897 regmap_read(mvchip->regs, GPIO_OUT_OFF + mvchip->offset, &out);
898 regmap_read(mvchip->regs, GPIO_IO_CONF_OFF + mvchip->offset, &io_conf);
899 regmap_read(mvchip->regs, GPIO_BLINK_EN_OFF + mvchip->offset, &blink);
900 regmap_read(mvchip->regs, GPIO_IN_POL_OFF + mvchip->offset, &in_pol);
901 regmap_read(mvchip->regs, GPIO_DATA_IN_OFF + mvchip->offset, &data_in);
902 cause = mvebu_gpio_read_edge_cause(mvchip);
903 edg_msk = mvebu_gpio_read_edge_mask(mvchip);
904 lvl_msk = mvebu_gpio_read_level_mask(mvchip);
905
906 for_each_requested_gpio(chip, i, label) {
907 u32 msk;
908 bool is_out;
909
910 msk = BIT(i);
911 is_out = !(io_conf & msk);
912
913 seq_printf(s, " gpio-%-3d (%-20.20s)", chip->base + i, label);
914
915 if (is_out) {
916 seq_printf(s, " out %s %s\n",
917 out & msk ? "hi" : "lo",
918 blink & msk ? "(blink )" : "");
919 continue;
920 }
921
922 seq_printf(s, " in %s (act %s) - IRQ",
923 (data_in ^ in_pol) & msk ? "hi" : "lo",
924 in_pol & msk ? "lo" : "hi");
925 if (!((edg_msk | lvl_msk) & msk)) {
926 seq_puts(s, " disabled\n");
927 continue;
928 }
929 if (edg_msk & msk)
930 seq_puts(s, " edge ");
931 if (lvl_msk & msk)
932 seq_puts(s, " level");
933 seq_printf(s, " (%s)\n", cause & msk ? "pending" : "clear ");
934 }
935}
936#else
937#define mvebu_gpio_dbg_show NULL
938#endif
939
940static const struct of_device_id mvebu_gpio_of_match[] = {
941 {
942 .compatible = "marvell,orion-gpio",
943 .data = (void *) MVEBU_GPIO_SOC_VARIANT_ORION,
944 },
945 {
946 .compatible = "marvell,mv78200-gpio",
947 .data = (void *) MVEBU_GPIO_SOC_VARIANT_MV78200,
948 },
949 {
950 .compatible = "marvell,armadaxp-gpio",
951 .data = (void *) MVEBU_GPIO_SOC_VARIANT_ARMADAXP,
952 },
953 {
954 .compatible = "marvell,armada-370-gpio",
955 .data = (void *) MVEBU_GPIO_SOC_VARIANT_ORION,
956 },
957 {
958 .compatible = "marvell,armada-8k-gpio",
959 .data = (void *) MVEBU_GPIO_SOC_VARIANT_A8K,
960 },
961 {
962 /* sentinel */
963 },
964};
965
966static int mvebu_gpio_suspend(struct platform_device *pdev, pm_message_t state)
967{
968 struct mvebu_gpio_chip *mvchip = platform_get_drvdata(pdev);
969 int i;
970
971 regmap_read(mvchip->regs, GPIO_OUT_OFF + mvchip->offset,
972 &mvchip->out_reg);
973 regmap_read(mvchip->regs, GPIO_IO_CONF_OFF + mvchip->offset,
974 &mvchip->io_conf_reg);
975 regmap_read(mvchip->regs, GPIO_BLINK_EN_OFF + mvchip->offset,
976 &mvchip->blink_en_reg);
977 regmap_read(mvchip->regs, GPIO_IN_POL_OFF + mvchip->offset,
978 &mvchip->in_pol_reg);
979
980 switch (mvchip->soc_variant) {
981 case MVEBU_GPIO_SOC_VARIANT_ORION:
982 case MVEBU_GPIO_SOC_VARIANT_A8K:
983 regmap_read(mvchip->regs, GPIO_EDGE_MASK_OFF + mvchip->offset,
984 &mvchip->edge_mask_regs[0]);
985 regmap_read(mvchip->regs, GPIO_LEVEL_MASK_OFF + mvchip->offset,
986 &mvchip->level_mask_regs[0]);
987 break;
988 case MVEBU_GPIO_SOC_VARIANT_MV78200:
989 for (i = 0; i < 2; i++) {
990 regmap_read(mvchip->regs,
991 GPIO_EDGE_MASK_MV78200_OFF(i),
992 &mvchip->edge_mask_regs[i]);
993 regmap_read(mvchip->regs,
994 GPIO_LEVEL_MASK_MV78200_OFF(i),
995 &mvchip->level_mask_regs[i]);
996 }
997 break;
998 case MVEBU_GPIO_SOC_VARIANT_ARMADAXP:
999 for (i = 0; i < 4; i++) {
1000 regmap_read(mvchip->regs,
1001 GPIO_EDGE_MASK_ARMADAXP_OFF(i),
1002 &mvchip->edge_mask_regs[i]);
1003 regmap_read(mvchip->regs,
1004 GPIO_LEVEL_MASK_ARMADAXP_OFF(i),
1005 &mvchip->level_mask_regs[i]);
1006 }
1007 break;
1008 default:
1009 BUG();
1010 }
1011
1012 if (IS_ENABLED(CONFIG_PWM))
1013 mvebu_pwm_suspend(mvchip);
1014
1015 return 0;
1016}
1017
1018static int mvebu_gpio_resume(struct platform_device *pdev)
1019{
1020 struct mvebu_gpio_chip *mvchip = platform_get_drvdata(pdev);
1021 int i;
1022
1023 regmap_write(mvchip->regs, GPIO_OUT_OFF + mvchip->offset,
1024 mvchip->out_reg);
1025 regmap_write(mvchip->regs, GPIO_IO_CONF_OFF + mvchip->offset,
1026 mvchip->io_conf_reg);
1027 regmap_write(mvchip->regs, GPIO_BLINK_EN_OFF + mvchip->offset,
1028 mvchip->blink_en_reg);
1029 regmap_write(mvchip->regs, GPIO_IN_POL_OFF + mvchip->offset,
1030 mvchip->in_pol_reg);
1031
1032 switch (mvchip->soc_variant) {
1033 case MVEBU_GPIO_SOC_VARIANT_ORION:
1034 case MVEBU_GPIO_SOC_VARIANT_A8K:
1035 regmap_write(mvchip->regs, GPIO_EDGE_MASK_OFF + mvchip->offset,
1036 mvchip->edge_mask_regs[0]);
1037 regmap_write(mvchip->regs, GPIO_LEVEL_MASK_OFF + mvchip->offset,
1038 mvchip->level_mask_regs[0]);
1039 break;
1040 case MVEBU_GPIO_SOC_VARIANT_MV78200:
1041 for (i = 0; i < 2; i++) {
1042 regmap_write(mvchip->regs,
1043 GPIO_EDGE_MASK_MV78200_OFF(i),
1044 mvchip->edge_mask_regs[i]);
1045 regmap_write(mvchip->regs,
1046 GPIO_LEVEL_MASK_MV78200_OFF(i),
1047 mvchip->level_mask_regs[i]);
1048 }
1049 break;
1050 case MVEBU_GPIO_SOC_VARIANT_ARMADAXP:
1051 for (i = 0; i < 4; i++) {
1052 regmap_write(mvchip->regs,
1053 GPIO_EDGE_MASK_ARMADAXP_OFF(i),
1054 mvchip->edge_mask_regs[i]);
1055 regmap_write(mvchip->regs,
1056 GPIO_LEVEL_MASK_ARMADAXP_OFF(i),
1057 mvchip->level_mask_regs[i]);
1058 }
1059 break;
1060 default:
1061 BUG();
1062 }
1063
1064 if (IS_ENABLED(CONFIG_PWM))
1065 mvebu_pwm_resume(mvchip);
1066
1067 return 0;
1068}
1069
1070static int mvebu_gpio_probe_raw(struct platform_device *pdev,
1071 struct mvebu_gpio_chip *mvchip)
1072{
1073 void __iomem *base;
1074
1075 base = devm_platform_ioremap_resource(pdev, 0);
1076 if (IS_ERR(base))
1077 return PTR_ERR(base);
1078
1079 mvchip->regs = devm_regmap_init_mmio(&pdev->dev, base,
1080 &mvebu_gpio_regmap_config);
1081 if (IS_ERR(mvchip->regs))
1082 return PTR_ERR(mvchip->regs);
1083
1084 /*
1085 * For the legacy SoCs, the regmap directly maps to the GPIO
1086 * registers, so no offset is needed.
1087 */
1088 mvchip->offset = 0;
1089
1090 /*
1091 * The Armada XP has a second range of registers for the
1092 * per-CPU registers
1093 */
1094 if (mvchip->soc_variant == MVEBU_GPIO_SOC_VARIANT_ARMADAXP) {
1095 base = devm_platform_ioremap_resource(pdev, 1);
1096 if (IS_ERR(base))
1097 return PTR_ERR(base);
1098
1099 mvchip->percpu_regs =
1100 devm_regmap_init_mmio(&pdev->dev, base,
1101 &mvebu_gpio_regmap_config);
1102 if (IS_ERR(mvchip->percpu_regs))
1103 return PTR_ERR(mvchip->percpu_regs);
1104 }
1105
1106 return 0;
1107}
1108
1109static int mvebu_gpio_probe_syscon(struct platform_device *pdev,
1110 struct mvebu_gpio_chip *mvchip)
1111{
1112 mvchip->regs = syscon_node_to_regmap(pdev->dev.parent->of_node);
1113 if (IS_ERR(mvchip->regs))
1114 return PTR_ERR(mvchip->regs);
1115
1116 if (of_property_read_u32(pdev->dev.of_node, "offset", &mvchip->offset))
1117 return -EINVAL;
1118
1119 return 0;
1120}
1121
1122static int mvebu_gpio_probe(struct platform_device *pdev)
1123{
1124 struct mvebu_gpio_chip *mvchip;
1125 const struct of_device_id *match;
1126 struct device_node *np = pdev->dev.of_node;
1127 struct irq_chip_generic *gc;
1128 struct irq_chip_type *ct;
1129 unsigned int ngpios;
1130 bool have_irqs;
1131 int soc_variant;
1132 int i, cpu, id;
1133 int err;
1134
1135 match = of_match_device(mvebu_gpio_of_match, &pdev->dev);
1136 if (match)
1137 soc_variant = (unsigned long) match->data;
1138 else
1139 soc_variant = MVEBU_GPIO_SOC_VARIANT_ORION;
1140
1141 /* Some gpio controllers do not provide irq support */
1142 err = platform_irq_count(pdev);
1143 if (err < 0)
1144 return err;
1145
1146 have_irqs = err != 0;
1147
1148 mvchip = devm_kzalloc(&pdev->dev, sizeof(struct mvebu_gpio_chip),
1149 GFP_KERNEL);
1150 if (!mvchip)
1151 return -ENOMEM;
1152
1153 platform_set_drvdata(pdev, mvchip);
1154
1155 if (of_property_read_u32(pdev->dev.of_node, "ngpios", &ngpios)) {
1156 dev_err(&pdev->dev, "Missing ngpios OF property\n");
1157 return -ENODEV;
1158 }
1159
1160 id = of_alias_get_id(pdev->dev.of_node, "gpio");
1161 if (id < 0) {
1162 dev_err(&pdev->dev, "Couldn't get OF id\n");
1163 return id;
1164 }
1165
1166 mvchip->clk = devm_clk_get(&pdev->dev, NULL);
1167 /* Not all SoCs require a clock.*/
1168 if (!IS_ERR(mvchip->clk))
1169 clk_prepare_enable(mvchip->clk);
1170
1171 mvchip->soc_variant = soc_variant;
1172 mvchip->chip.label = dev_name(&pdev->dev);
1173 mvchip->chip.parent = &pdev->dev;
1174 mvchip->chip.request = gpiochip_generic_request;
1175 mvchip->chip.free = gpiochip_generic_free;
1176 mvchip->chip.get_direction = mvebu_gpio_get_direction;
1177 mvchip->chip.direction_input = mvebu_gpio_direction_input;
1178 mvchip->chip.get = mvebu_gpio_get;
1179 mvchip->chip.direction_output = mvebu_gpio_direction_output;
1180 mvchip->chip.set = mvebu_gpio_set;
1181 if (have_irqs)
1182 mvchip->chip.to_irq = mvebu_gpio_to_irq;
1183 mvchip->chip.base = id * MVEBU_MAX_GPIO_PER_BANK;
1184 mvchip->chip.ngpio = ngpios;
1185 mvchip->chip.can_sleep = false;
1186 mvchip->chip.of_node = np;
1187 mvchip->chip.dbg_show = mvebu_gpio_dbg_show;
1188
1189 if (soc_variant == MVEBU_GPIO_SOC_VARIANT_A8K)
1190 err = mvebu_gpio_probe_syscon(pdev, mvchip);
1191 else
1192 err = mvebu_gpio_probe_raw(pdev, mvchip);
1193
1194 if (err)
1195 return err;
1196
1197 /*
1198 * Mask and clear GPIO interrupts.
1199 */
1200 switch (soc_variant) {
1201 case MVEBU_GPIO_SOC_VARIANT_ORION:
1202 case MVEBU_GPIO_SOC_VARIANT_A8K:
1203 regmap_write(mvchip->regs,
1204 GPIO_EDGE_CAUSE_OFF + mvchip->offset, 0);
1205 regmap_write(mvchip->regs,
1206 GPIO_EDGE_MASK_OFF + mvchip->offset, 0);
1207 regmap_write(mvchip->regs,
1208 GPIO_LEVEL_MASK_OFF + mvchip->offset, 0);
1209 break;
1210 case MVEBU_GPIO_SOC_VARIANT_MV78200:
1211 regmap_write(mvchip->regs, GPIO_EDGE_CAUSE_OFF, 0);
1212 for (cpu = 0; cpu < 2; cpu++) {
1213 regmap_write(mvchip->regs,
1214 GPIO_EDGE_MASK_MV78200_OFF(cpu), 0);
1215 regmap_write(mvchip->regs,
1216 GPIO_LEVEL_MASK_MV78200_OFF(cpu), 0);
1217 }
1218 break;
1219 case MVEBU_GPIO_SOC_VARIANT_ARMADAXP:
1220 regmap_write(mvchip->regs, GPIO_EDGE_CAUSE_OFF, 0);
1221 regmap_write(mvchip->regs, GPIO_EDGE_MASK_OFF, 0);
1222 regmap_write(mvchip->regs, GPIO_LEVEL_MASK_OFF, 0);
1223 for (cpu = 0; cpu < 4; cpu++) {
1224 regmap_write(mvchip->percpu_regs,
1225 GPIO_EDGE_CAUSE_ARMADAXP_OFF(cpu), 0);
1226 regmap_write(mvchip->percpu_regs,
1227 GPIO_EDGE_MASK_ARMADAXP_OFF(cpu), 0);
1228 regmap_write(mvchip->percpu_regs,
1229 GPIO_LEVEL_MASK_ARMADAXP_OFF(cpu), 0);
1230 }
1231 break;
1232 default:
1233 BUG();
1234 }
1235
1236 devm_gpiochip_add_data(&pdev->dev, &mvchip->chip, mvchip);
1237
1238 /* Some MVEBU SoCs have simple PWM support for GPIO lines */
1239 if (IS_ENABLED(CONFIG_PWM)) {
1240 err = mvebu_pwm_probe(pdev, mvchip, id);
1241 if (err)
1242 return err;
1243 }
1244
1245 /* Some gpio controllers do not provide irq support */
1246 if (!have_irqs)
1247 return 0;
1248
1249 mvchip->domain =
1250 irq_domain_add_linear(np, ngpios, &irq_generic_chip_ops, NULL);
1251 if (!mvchip->domain) {
1252 dev_err(&pdev->dev, "couldn't allocate irq domain %s (DT).\n",
1253 mvchip->chip.label);
1254 err = -ENODEV;
1255 goto err_pwm;
1256 }
1257
1258 err = irq_alloc_domain_generic_chips(
1259 mvchip->domain, ngpios, 2, np->name, handle_level_irq,
1260 IRQ_NOREQUEST | IRQ_NOPROBE | IRQ_LEVEL, 0, 0);
1261 if (err) {
1262 dev_err(&pdev->dev, "couldn't allocate irq chips %s (DT).\n",
1263 mvchip->chip.label);
1264 goto err_domain;
1265 }
1266
1267 /*
1268 * NOTE: The common accessors cannot be used because of the percpu
1269 * access to the mask registers
1270 */
1271 gc = irq_get_domain_generic_chip(mvchip->domain, 0);
1272 gc->private = mvchip;
1273 ct = &gc->chip_types[0];
1274 ct->type = IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW;
1275 ct->chip.irq_mask = mvebu_gpio_level_irq_mask;
1276 ct->chip.irq_unmask = mvebu_gpio_level_irq_unmask;
1277 ct->chip.irq_set_type = mvebu_gpio_irq_set_type;
1278 ct->chip.name = mvchip->chip.label;
1279
1280 ct = &gc->chip_types[1];
1281 ct->type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING;
1282 ct->chip.irq_ack = mvebu_gpio_irq_ack;
1283 ct->chip.irq_mask = mvebu_gpio_edge_irq_mask;
1284 ct->chip.irq_unmask = mvebu_gpio_edge_irq_unmask;
1285 ct->chip.irq_set_type = mvebu_gpio_irq_set_type;
1286 ct->handler = handle_edge_irq;
1287 ct->chip.name = mvchip->chip.label;
1288
1289 /*
1290 * Setup the interrupt handlers. Each chip can have up to 4
1291 * interrupt handlers, with each handler dealing with 8 GPIO
1292 * pins.
1293 */
1294 for (i = 0; i < 4; i++) {
1295 int irq = platform_get_irq_optional(pdev, i);
1296
1297 if (irq < 0)
1298 continue;
1299 irq_set_chained_handler_and_data(irq, mvebu_gpio_irq_handler,
1300 mvchip);
1301 }
1302
1303 return 0;
1304
1305err_domain:
1306 irq_domain_remove(mvchip->domain);
1307err_pwm:
1308 pwmchip_remove(&mvchip->mvpwm->chip);
1309
1310 return err;
1311}
1312
1313static struct platform_driver mvebu_gpio_driver = {
1314 .driver = {
1315 .name = "mvebu-gpio",
1316 .of_match_table = mvebu_gpio_of_match,
1317 },
1318 .probe = mvebu_gpio_probe,
1319 .suspend = mvebu_gpio_suspend,
1320 .resume = mvebu_gpio_resume,
1321};
1322builtin_platform_driver(mvebu_gpio_driver);