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-rw-r--r--arch/arm/plat-nomadik/gpio.c643
1 files changed, 0 insertions, 643 deletions
diff --git a/arch/arm/plat-nomadik/gpio.c b/arch/arm/plat-nomadik/gpio.c
deleted file mode 100644
index 977c8f9a07a2..000000000000
--- a/arch/arm/plat-nomadik/gpio.c
+++ /dev/null
@@ -1,643 +0,0 @@
1/*
2 * Generic GPIO driver for logic cells found in the Nomadik SoC
3 *
4 * Copyright (C) 2008,2009 STMicroelectronics
5 * Copyright (C) 2009 Alessandro Rubini <rubini@unipv.it>
6 * Rewritten based on work by Prafulla WADASKAR <prafulla.wadaskar@st.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12#include <linux/kernel.h>
13#include <linux/module.h>
14#include <linux/init.h>
15#include <linux/device.h>
16#include <linux/platform_device.h>
17#include <linux/io.h>
18#include <linux/clk.h>
19#include <linux/err.h>
20#include <linux/gpio.h>
21#include <linux/spinlock.h>
22#include <linux/interrupt.h>
23#include <linux/irq.h>
24#include <linux/slab.h>
25
26#include <plat/pincfg.h>
27#include <mach/hardware.h>
28#include <mach/gpio.h>
29
30/*
31 * The GPIO module in the Nomadik family of Systems-on-Chip is an
32 * AMBA device, managing 32 pins and alternate functions. The logic block
33 * is currently only used in the Nomadik.
34 *
35 * Symbols in this file are called "nmk_gpio" for "nomadik gpio"
36 */
37
38#define NMK_GPIO_PER_CHIP 32
39struct nmk_gpio_chip {
40 struct gpio_chip chip;
41 void __iomem *addr;
42 struct clk *clk;
43 unsigned int parent_irq;
44 spinlock_t lock;
45 /* Keep track of configured edges */
46 u32 edge_rising;
47 u32 edge_falling;
48};
49
50static void __nmk_gpio_set_mode(struct nmk_gpio_chip *nmk_chip,
51 unsigned offset, int gpio_mode)
52{
53 u32 bit = 1 << offset;
54 u32 afunc, bfunc;
55
56 afunc = readl(nmk_chip->addr + NMK_GPIO_AFSLA) & ~bit;
57 bfunc = readl(nmk_chip->addr + NMK_GPIO_AFSLB) & ~bit;
58 if (gpio_mode & NMK_GPIO_ALT_A)
59 afunc |= bit;
60 if (gpio_mode & NMK_GPIO_ALT_B)
61 bfunc |= bit;
62 writel(afunc, nmk_chip->addr + NMK_GPIO_AFSLA);
63 writel(bfunc, nmk_chip->addr + NMK_GPIO_AFSLB);
64}
65
66static void __nmk_gpio_set_slpm(struct nmk_gpio_chip *nmk_chip,
67 unsigned offset, enum nmk_gpio_slpm mode)
68{
69 u32 bit = 1 << offset;
70 u32 slpm;
71
72 slpm = readl(nmk_chip->addr + NMK_GPIO_SLPC);
73 if (mode == NMK_GPIO_SLPM_NOCHANGE)
74 slpm |= bit;
75 else
76 slpm &= ~bit;
77 writel(slpm, nmk_chip->addr + NMK_GPIO_SLPC);
78}
79
80static void __nmk_gpio_set_pull(struct nmk_gpio_chip *nmk_chip,
81 unsigned offset, enum nmk_gpio_pull pull)
82{
83 u32 bit = 1 << offset;
84 u32 pdis;
85
86 pdis = readl(nmk_chip->addr + NMK_GPIO_PDIS);
87 if (pull == NMK_GPIO_PULL_NONE)
88 pdis |= bit;
89 else
90 pdis &= ~bit;
91 writel(pdis, nmk_chip->addr + NMK_GPIO_PDIS);
92
93 if (pull == NMK_GPIO_PULL_UP)
94 writel(bit, nmk_chip->addr + NMK_GPIO_DATS);
95 else if (pull == NMK_GPIO_PULL_DOWN)
96 writel(bit, nmk_chip->addr + NMK_GPIO_DATC);
97}
98
99static void __nmk_gpio_make_input(struct nmk_gpio_chip *nmk_chip,
100 unsigned offset)
101{
102 writel(1 << offset, nmk_chip->addr + NMK_GPIO_DIRC);
103}
104
105static void __nmk_config_pin(struct nmk_gpio_chip *nmk_chip, unsigned offset,
106 pin_cfg_t cfg)
107{
108 static const char *afnames[] = {
109 [NMK_GPIO_ALT_GPIO] = "GPIO",
110 [NMK_GPIO_ALT_A] = "A",
111 [NMK_GPIO_ALT_B] = "B",
112 [NMK_GPIO_ALT_C] = "C"
113 };
114 static const char *pullnames[] = {
115 [NMK_GPIO_PULL_NONE] = "none",
116 [NMK_GPIO_PULL_UP] = "up",
117 [NMK_GPIO_PULL_DOWN] = "down",
118 [3] /* illegal */ = "??"
119 };
120 static const char *slpmnames[] = {
121 [NMK_GPIO_SLPM_INPUT] = "input",
122 [NMK_GPIO_SLPM_NOCHANGE] = "no-change",
123 };
124
125 int pin = PIN_NUM(cfg);
126 int pull = PIN_PULL(cfg);
127 int af = PIN_ALT(cfg);
128 int slpm = PIN_SLPM(cfg);
129
130 dev_dbg(nmk_chip->chip.dev, "pin %d: af %s, pull %s, slpm %s\n",
131 pin, afnames[af], pullnames[pull], slpmnames[slpm]);
132
133 __nmk_gpio_make_input(nmk_chip, offset);
134 __nmk_gpio_set_pull(nmk_chip, offset, pull);
135 __nmk_gpio_set_slpm(nmk_chip, offset, slpm);
136 __nmk_gpio_set_mode(nmk_chip, offset, af);
137}
138
139/**
140 * nmk_config_pin - configure a pin's mux attributes
141 * @cfg: pin confguration
142 *
143 * Configures a pin's mode (alternate function or GPIO), its pull up status,
144 * and its sleep mode based on the specified configuration. The @cfg is
145 * usually one of the SoC specific macros defined in mach/<soc>-pins.h. These
146 * are constructed using, and can be further enhanced with, the macros in
147 * plat/pincfg.h.
148 *
149 * If a pin's mode is set to GPIO, it is configured as an input to avoid
150 * side-effects. The gpio can be manipulated later using standard GPIO API
151 * calls.
152 */
153int nmk_config_pin(pin_cfg_t cfg)
154{
155 struct nmk_gpio_chip *nmk_chip;
156 int gpio = PIN_NUM(cfg);
157 unsigned long flags;
158
159 nmk_chip = get_irq_chip_data(NOMADIK_GPIO_TO_IRQ(gpio));
160 if (!nmk_chip)
161 return -EINVAL;
162
163 spin_lock_irqsave(&nmk_chip->lock, flags);
164 __nmk_config_pin(nmk_chip, gpio - nmk_chip->chip.base, cfg);
165 spin_unlock_irqrestore(&nmk_chip->lock, flags);
166
167 return 0;
168}
169EXPORT_SYMBOL(nmk_config_pin);
170
171/**
172 * nmk_config_pins - configure several pins at once
173 * @cfgs: array of pin configurations
174 * @num: number of elments in the array
175 *
176 * Configures several pins using nmk_config_pin(). Refer to that function for
177 * further information.
178 */
179int nmk_config_pins(pin_cfg_t *cfgs, int num)
180{
181 int ret = 0;
182 int i;
183
184 for (i = 0; i < num; i++) {
185 int ret = nmk_config_pin(cfgs[i]);
186 if (ret)
187 break;
188 }
189
190 return ret;
191}
192EXPORT_SYMBOL(nmk_config_pins);
193
194/**
195 * nmk_gpio_set_slpm() - configure the sleep mode of a pin
196 * @gpio: pin number
197 * @mode: NMK_GPIO_SLPM_INPUT or NMK_GPIO_SLPM_NOCHANGE,
198 *
199 * Sets the sleep mode of a pin. If @mode is NMK_GPIO_SLPM_INPUT, the pin is
200 * changed to an input (with pullup/down enabled) in sleep and deep sleep. If
201 * @mode is NMK_GPIO_SLPM_NOCHANGE, the pin remains in the state it was
202 * configured even when in sleep and deep sleep.
203 */
204int nmk_gpio_set_slpm(int gpio, enum nmk_gpio_slpm mode)
205{
206 struct nmk_gpio_chip *nmk_chip;
207 unsigned long flags;
208
209 nmk_chip = get_irq_chip_data(NOMADIK_GPIO_TO_IRQ(gpio));
210 if (!nmk_chip)
211 return -EINVAL;
212
213 spin_lock_irqsave(&nmk_chip->lock, flags);
214 __nmk_gpio_set_slpm(nmk_chip, gpio - nmk_chip->chip.base, mode);
215 spin_unlock_irqrestore(&nmk_chip->lock, flags);
216
217 return 0;
218}
219
220/**
221 * nmk_gpio_set_pull() - enable/disable pull up/down on a gpio
222 * @gpio: pin number
223 * @pull: one of NMK_GPIO_PULL_DOWN, NMK_GPIO_PULL_UP, and NMK_GPIO_PULL_NONE
224 *
225 * Enables/disables pull up/down on a specified pin. This only takes effect if
226 * the pin is configured as an input (either explicitly or by the alternate
227 * function).
228 *
229 * NOTE: If enabling the pull up/down, the caller must ensure that the GPIO is
230 * configured as an input. Otherwise, due to the way the controller registers
231 * work, this function will change the value output on the pin.
232 */
233int nmk_gpio_set_pull(int gpio, enum nmk_gpio_pull pull)
234{
235 struct nmk_gpio_chip *nmk_chip;
236 unsigned long flags;
237
238 nmk_chip = get_irq_chip_data(NOMADIK_GPIO_TO_IRQ(gpio));
239 if (!nmk_chip)
240 return -EINVAL;
241
242 spin_lock_irqsave(&nmk_chip->lock, flags);
243 __nmk_gpio_set_pull(nmk_chip, gpio - nmk_chip->chip.base, pull);
244 spin_unlock_irqrestore(&nmk_chip->lock, flags);
245
246 return 0;
247}
248
249/* Mode functions */
250int nmk_gpio_set_mode(int gpio, int gpio_mode)
251{
252 struct nmk_gpio_chip *nmk_chip;
253 unsigned long flags;
254
255 nmk_chip = get_irq_chip_data(NOMADIK_GPIO_TO_IRQ(gpio));
256 if (!nmk_chip)
257 return -EINVAL;
258
259 spin_lock_irqsave(&nmk_chip->lock, flags);
260 __nmk_gpio_set_mode(nmk_chip, gpio - nmk_chip->chip.base, gpio_mode);
261 spin_unlock_irqrestore(&nmk_chip->lock, flags);
262
263 return 0;
264}
265EXPORT_SYMBOL(nmk_gpio_set_mode);
266
267int nmk_gpio_get_mode(int gpio)
268{
269 struct nmk_gpio_chip *nmk_chip;
270 u32 afunc, bfunc, bit;
271
272 nmk_chip = get_irq_chip_data(NOMADIK_GPIO_TO_IRQ(gpio));
273 if (!nmk_chip)
274 return -EINVAL;
275
276 bit = 1 << (gpio - nmk_chip->chip.base);
277
278 afunc = readl(nmk_chip->addr + NMK_GPIO_AFSLA) & bit;
279 bfunc = readl(nmk_chip->addr + NMK_GPIO_AFSLB) & bit;
280
281 return (afunc ? NMK_GPIO_ALT_A : 0) | (bfunc ? NMK_GPIO_ALT_B : 0);
282}
283EXPORT_SYMBOL(nmk_gpio_get_mode);
284
285
286/* IRQ functions */
287static inline int nmk_gpio_get_bitmask(int gpio)
288{
289 return 1 << (gpio % 32);
290}
291
292static void nmk_gpio_irq_ack(unsigned int irq)
293{
294 int gpio;
295 struct nmk_gpio_chip *nmk_chip;
296
297 gpio = NOMADIK_IRQ_TO_GPIO(irq);
298 nmk_chip = get_irq_chip_data(irq);
299 if (!nmk_chip)
300 return;
301 writel(nmk_gpio_get_bitmask(gpio), nmk_chip->addr + NMK_GPIO_IC);
302}
303
304enum nmk_gpio_irq_type {
305 NORMAL,
306 WAKE,
307};
308
309static void __nmk_gpio_irq_modify(struct nmk_gpio_chip *nmk_chip,
310 int gpio, enum nmk_gpio_irq_type which,
311 bool enable)
312{
313 u32 rimsc = which == WAKE ? NMK_GPIO_RWIMSC : NMK_GPIO_RIMSC;
314 u32 fimsc = which == WAKE ? NMK_GPIO_FWIMSC : NMK_GPIO_FIMSC;
315 u32 bitmask = nmk_gpio_get_bitmask(gpio);
316 u32 reg;
317
318 /* we must individually set/clear the two edges */
319 if (nmk_chip->edge_rising & bitmask) {
320 reg = readl(nmk_chip->addr + rimsc);
321 if (enable)
322 reg |= bitmask;
323 else
324 reg &= ~bitmask;
325 writel(reg, nmk_chip->addr + rimsc);
326 }
327 if (nmk_chip->edge_falling & bitmask) {
328 reg = readl(nmk_chip->addr + fimsc);
329 if (enable)
330 reg |= bitmask;
331 else
332 reg &= ~bitmask;
333 writel(reg, nmk_chip->addr + fimsc);
334 }
335}
336
337static int nmk_gpio_irq_modify(unsigned int irq, enum nmk_gpio_irq_type which,
338 bool enable)
339{
340 int gpio;
341 struct nmk_gpio_chip *nmk_chip;
342 unsigned long flags;
343 u32 bitmask;
344
345 gpio = NOMADIK_IRQ_TO_GPIO(irq);
346 nmk_chip = get_irq_chip_data(irq);
347 bitmask = nmk_gpio_get_bitmask(gpio);
348 if (!nmk_chip)
349 return -EINVAL;
350
351 spin_lock_irqsave(&nmk_chip->lock, flags);
352 __nmk_gpio_irq_modify(nmk_chip, gpio, which, enable);
353 spin_unlock_irqrestore(&nmk_chip->lock, flags);
354
355 return 0;
356}
357
358static void nmk_gpio_irq_mask(unsigned int irq)
359{
360 nmk_gpio_irq_modify(irq, NORMAL, false);
361}
362
363static void nmk_gpio_irq_unmask(unsigned int irq)
364{
365 nmk_gpio_irq_modify(irq, NORMAL, true);
366}
367
368static int nmk_gpio_irq_set_wake(unsigned int irq, unsigned int on)
369{
370 return nmk_gpio_irq_modify(irq, WAKE, on);
371}
372
373static int nmk_gpio_irq_set_type(unsigned int irq, unsigned int type)
374{
375 struct irq_desc *desc = irq_to_desc(irq);
376 bool enabled = !(desc->status & IRQ_DISABLED);
377 bool wake = desc->wake_depth;
378 int gpio;
379 struct nmk_gpio_chip *nmk_chip;
380 unsigned long flags;
381 u32 bitmask;
382
383 gpio = NOMADIK_IRQ_TO_GPIO(irq);
384 nmk_chip = get_irq_chip_data(irq);
385 bitmask = nmk_gpio_get_bitmask(gpio);
386 if (!nmk_chip)
387 return -EINVAL;
388
389 if (type & IRQ_TYPE_LEVEL_HIGH)
390 return -EINVAL;
391 if (type & IRQ_TYPE_LEVEL_LOW)
392 return -EINVAL;
393
394 spin_lock_irqsave(&nmk_chip->lock, flags);
395
396 if (enabled)
397 __nmk_gpio_irq_modify(nmk_chip, gpio, NORMAL, false);
398
399 if (wake)
400 __nmk_gpio_irq_modify(nmk_chip, gpio, WAKE, false);
401
402 nmk_chip->edge_rising &= ~bitmask;
403 if (type & IRQ_TYPE_EDGE_RISING)
404 nmk_chip->edge_rising |= bitmask;
405
406 nmk_chip->edge_falling &= ~bitmask;
407 if (type & IRQ_TYPE_EDGE_FALLING)
408 nmk_chip->edge_falling |= bitmask;
409
410 if (enabled)
411 __nmk_gpio_irq_modify(nmk_chip, gpio, NORMAL, true);
412
413 if (wake)
414 __nmk_gpio_irq_modify(nmk_chip, gpio, WAKE, true);
415
416 spin_unlock_irqrestore(&nmk_chip->lock, flags);
417
418 return 0;
419}
420
421static struct irq_chip nmk_gpio_irq_chip = {
422 .name = "Nomadik-GPIO",
423 .ack = nmk_gpio_irq_ack,
424 .mask = nmk_gpio_irq_mask,
425 .unmask = nmk_gpio_irq_unmask,
426 .set_type = nmk_gpio_irq_set_type,
427 .set_wake = nmk_gpio_irq_set_wake,
428};
429
430static void nmk_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
431{
432 struct nmk_gpio_chip *nmk_chip;
433 struct irq_chip *host_chip = get_irq_chip(irq);
434 unsigned int gpio_irq;
435 u32 pending;
436 unsigned int first_irq;
437
438 if (host_chip->mask_ack)
439 host_chip->mask_ack(irq);
440 else {
441 host_chip->mask(irq);
442 if (host_chip->ack)
443 host_chip->ack(irq);
444 }
445
446 nmk_chip = get_irq_data(irq);
447 first_irq = NOMADIK_GPIO_TO_IRQ(nmk_chip->chip.base);
448 while ( (pending = readl(nmk_chip->addr + NMK_GPIO_IS)) ) {
449 gpio_irq = first_irq + __ffs(pending);
450 generic_handle_irq(gpio_irq);
451 }
452
453 host_chip->unmask(irq);
454}
455
456static int nmk_gpio_init_irq(struct nmk_gpio_chip *nmk_chip)
457{
458 unsigned int first_irq;
459 int i;
460
461 first_irq = NOMADIK_GPIO_TO_IRQ(nmk_chip->chip.base);
462 for (i = first_irq; i < first_irq + NMK_GPIO_PER_CHIP; i++) {
463 set_irq_chip(i, &nmk_gpio_irq_chip);
464 set_irq_handler(i, handle_edge_irq);
465 set_irq_flags(i, IRQF_VALID);
466 set_irq_chip_data(i, nmk_chip);
467 set_irq_type(i, IRQ_TYPE_EDGE_FALLING);
468 }
469 set_irq_chained_handler(nmk_chip->parent_irq, nmk_gpio_irq_handler);
470 set_irq_data(nmk_chip->parent_irq, nmk_chip);
471 return 0;
472}
473
474/* I/O Functions */
475static int nmk_gpio_make_input(struct gpio_chip *chip, unsigned offset)
476{
477 struct nmk_gpio_chip *nmk_chip =
478 container_of(chip, struct nmk_gpio_chip, chip);
479
480 writel(1 << offset, nmk_chip->addr + NMK_GPIO_DIRC);
481 return 0;
482}
483
484static int nmk_gpio_get_input(struct gpio_chip *chip, unsigned offset)
485{
486 struct nmk_gpio_chip *nmk_chip =
487 container_of(chip, struct nmk_gpio_chip, chip);
488 u32 bit = 1 << offset;
489
490 return (readl(nmk_chip->addr + NMK_GPIO_DAT) & bit) != 0;
491}
492
493static void nmk_gpio_set_output(struct gpio_chip *chip, unsigned offset,
494 int val)
495{
496 struct nmk_gpio_chip *nmk_chip =
497 container_of(chip, struct nmk_gpio_chip, chip);
498 u32 bit = 1 << offset;
499
500 if (val)
501 writel(bit, nmk_chip->addr + NMK_GPIO_DATS);
502 else
503 writel(bit, nmk_chip->addr + NMK_GPIO_DATC);
504}
505
506static int nmk_gpio_make_output(struct gpio_chip *chip, unsigned offset,
507 int val)
508{
509 struct nmk_gpio_chip *nmk_chip =
510 container_of(chip, struct nmk_gpio_chip, chip);
511
512 writel(1 << offset, nmk_chip->addr + NMK_GPIO_DIRS);
513 nmk_gpio_set_output(chip, offset, val);
514
515 return 0;
516}
517
518static int nmk_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
519{
520 struct nmk_gpio_chip *nmk_chip =
521 container_of(chip, struct nmk_gpio_chip, chip);
522
523 return NOMADIK_GPIO_TO_IRQ(nmk_chip->chip.base) + offset;
524}
525
526/* This structure is replicated for each GPIO block allocated at probe time */
527static struct gpio_chip nmk_gpio_template = {
528 .direction_input = nmk_gpio_make_input,
529 .get = nmk_gpio_get_input,
530 .direction_output = nmk_gpio_make_output,
531 .set = nmk_gpio_set_output,
532 .to_irq = nmk_gpio_to_irq,
533 .ngpio = NMK_GPIO_PER_CHIP,
534 .can_sleep = 0,
535};
536
537static int __init nmk_gpio_probe(struct platform_device *dev)
538{
539 struct nmk_gpio_platform_data *pdata = dev->dev.platform_data;
540 struct nmk_gpio_chip *nmk_chip;
541 struct gpio_chip *chip;
542 struct resource *res;
543 struct clk *clk;
544 int irq;
545 int ret;
546
547 if (!pdata)
548 return -ENODEV;
549
550 res = platform_get_resource(dev, IORESOURCE_MEM, 0);
551 if (!res) {
552 ret = -ENOENT;
553 goto out;
554 }
555
556 irq = platform_get_irq(dev, 0);
557 if (irq < 0) {
558 ret = irq;
559 goto out;
560 }
561
562 if (request_mem_region(res->start, resource_size(res),
563 dev_name(&dev->dev)) == NULL) {
564 ret = -EBUSY;
565 goto out;
566 }
567
568 clk = clk_get(&dev->dev, NULL);
569 if (IS_ERR(clk)) {
570 ret = PTR_ERR(clk);
571 goto out_release;
572 }
573
574 clk_enable(clk);
575
576 nmk_chip = kzalloc(sizeof(*nmk_chip), GFP_KERNEL);
577 if (!nmk_chip) {
578 ret = -ENOMEM;
579 goto out_clk;
580 }
581 /*
582 * The virt address in nmk_chip->addr is in the nomadik register space,
583 * so we can simply convert the resource address, without remapping
584 */
585 nmk_chip->clk = clk;
586 nmk_chip->addr = io_p2v(res->start);
587 nmk_chip->chip = nmk_gpio_template;
588 nmk_chip->parent_irq = irq;
589 spin_lock_init(&nmk_chip->lock);
590
591 chip = &nmk_chip->chip;
592 chip->base = pdata->first_gpio;
593 chip->label = pdata->name;
594 chip->dev = &dev->dev;
595 chip->owner = THIS_MODULE;
596
597 ret = gpiochip_add(&nmk_chip->chip);
598 if (ret)
599 goto out_free;
600
601 platform_set_drvdata(dev, nmk_chip);
602
603 nmk_gpio_init_irq(nmk_chip);
604
605 dev_info(&dev->dev, "Bits %i-%i at address %p\n",
606 nmk_chip->chip.base, nmk_chip->chip.base+31, nmk_chip->addr);
607 return 0;
608
609out_free:
610 kfree(nmk_chip);
611out_clk:
612 clk_disable(clk);
613 clk_put(clk);
614out_release:
615 release_mem_region(res->start, resource_size(res));
616out:
617 dev_err(&dev->dev, "Failure %i for GPIO %i-%i\n", ret,
618 pdata->first_gpio, pdata->first_gpio+31);
619 return ret;
620}
621
622static struct platform_driver nmk_gpio_driver = {
623 .driver = {
624 .owner = THIS_MODULE,
625 .name = "gpio",
626 },
627 .probe = nmk_gpio_probe,
628 .suspend = NULL, /* to be done */
629 .resume = NULL,
630};
631
632static int __init nmk_gpio_init(void)
633{
634 return platform_driver_register(&nmk_gpio_driver);
635}
636
637core_initcall(nmk_gpio_init);
638
639MODULE_AUTHOR("Prafulla WADASKAR and Alessandro Rubini");
640MODULE_DESCRIPTION("Nomadik GPIO Driver");
641MODULE_LICENSE("GPL");
642
643
generated by cgit v1.2.2 (git 2.25.0) at 2025-09-12 11:44:51 -0400