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1/*
2 * TI DaVinci GPIO Support
3 *
4 * Copyright (c) 2006-2007 David Brownell
5 * Copyright (c) 2007, MontaVista Software, Inc. <source@mvista.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 */
12#include <linux/gpio.h>
13#include <linux/errno.h>
14#include <linux/kernel.h>
15#include <linux/clk.h>
16#include <linux/err.h>
17#include <linux/io.h>
18#include <linux/irq.h>
19#include <linux/irqdomain.h>
20#include <linux/module.h>
21#include <linux/of.h>
22#include <linux/of_device.h>
23#include <linux/platform_device.h>
24#include <linux/platform_data/gpio-davinci.h>
25#include <linux/irqchip/chained_irq.h>
26
27struct davinci_gpio_regs {
28 u32 dir;
29 u32 out_data;
30 u32 set_data;
31 u32 clr_data;
32 u32 in_data;
33 u32 set_rising;
34 u32 clr_rising;
35 u32 set_falling;
36 u32 clr_falling;
37 u32 intstat;
38};
39
40typedef struct irq_chip *(*gpio_get_irq_chip_cb_t)(unsigned int irq);
41
42#define BINTEN 0x8 /* GPIO Interrupt Per-Bank Enable Register */
43
44static void __iomem *gpio_base;
45
46static struct davinci_gpio_regs __iomem *gpio2regs(unsigned gpio)
47{
48 void __iomem *ptr;
49
50 if (gpio < 32 * 1)
51 ptr = gpio_base + 0x10;
52 else if (gpio < 32 * 2)
53 ptr = gpio_base + 0x38;
54 else if (gpio < 32 * 3)
55 ptr = gpio_base + 0x60;
56 else if (gpio < 32 * 4)
57 ptr = gpio_base + 0x88;
58 else if (gpio < 32 * 5)
59 ptr = gpio_base + 0xb0;
60 else
61 ptr = NULL;
62 return ptr;
63}
64
65static inline struct davinci_gpio_regs __iomem *irq2regs(struct irq_data *d)
66{
67 struct davinci_gpio_regs __iomem *g;
68
69 g = (__force struct davinci_gpio_regs __iomem *)irq_data_get_irq_chip_data(d);
70
71 return g;
72}
73
74static int davinci_gpio_irq_setup(struct platform_device *pdev);
75
76/*--------------------------------------------------------------------------*/
77
78/* board setup code *MUST* setup pinmux and enable the GPIO clock. */
79static inline int __davinci_direction(struct gpio_chip *chip,
80 unsigned offset, bool out, int value)
81{
82 struct davinci_gpio_controller *d = gpiochip_get_data(chip);
83 struct davinci_gpio_regs __iomem *g = d->regs;
84 unsigned long flags;
85 u32 temp;
86 u32 mask = 1 << offset;
87
88 spin_lock_irqsave(&d->lock, flags);
89 temp = readl_relaxed(&g->dir);
90 if (out) {
91 temp &= ~mask;
92 writel_relaxed(mask, value ? &g->set_data : &g->clr_data);
93 } else {
94 temp |= mask;
95 }
96 writel_relaxed(temp, &g->dir);
97 spin_unlock_irqrestore(&d->lock, flags);
98
99 return 0;
100}
101
102static int davinci_direction_in(struct gpio_chip *chip, unsigned offset)
103{
104 return __davinci_direction(chip, offset, false, 0);
105}
106
107static int
108davinci_direction_out(struct gpio_chip *chip, unsigned offset, int value)
109{
110 return __davinci_direction(chip, offset, true, value);
111}
112
113/*
114 * Read the pin's value (works even if it's set up as output);
115 * returns zero/nonzero.
116 *
117 * Note that changes are synched to the GPIO clock, so reading values back
118 * right after you've set them may give old values.
119 */
120static int davinci_gpio_get(struct gpio_chip *chip, unsigned offset)
121{
122 struct davinci_gpio_controller *d = gpiochip_get_data(chip);
123 struct davinci_gpio_regs __iomem *g = d->regs;
124
125 return !!((1 << offset) & readl_relaxed(&g->in_data));
126}
127
128/*
129 * Assuming the pin is muxed as a gpio output, set its output value.
130 */
131static void
132davinci_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
133{
134 struct davinci_gpio_controller *d = gpiochip_get_data(chip);
135 struct davinci_gpio_regs __iomem *g = d->regs;
136
137 writel_relaxed((1 << offset), value ? &g->set_data : &g->clr_data);
138}
139
140static struct davinci_gpio_platform_data *
141davinci_gpio_get_pdata(struct platform_device *pdev)
142{
143 struct device_node *dn = pdev->dev.of_node;
144 struct davinci_gpio_platform_data *pdata;
145 int ret;
146 u32 val;
147
148 if (!IS_ENABLED(CONFIG_OF) || !pdev->dev.of_node)
149 return dev_get_platdata(&pdev->dev);
150
151 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
152 if (!pdata)
153 return NULL;
154
155 ret = of_property_read_u32(dn, "ti,ngpio", &val);
156 if (ret)
157 goto of_err;
158
159 pdata->ngpio = val;
160
161 ret = of_property_read_u32(dn, "ti,davinci-gpio-unbanked", &val);
162 if (ret)
163 goto of_err;
164
165 pdata->gpio_unbanked = val;
166
167 return pdata;
168
169of_err:
170 dev_err(&pdev->dev, "Populating pdata from DT failed: err %d\n", ret);
171 return NULL;
172}
173
174#ifdef CONFIG_OF_GPIO
175static int davinci_gpio_of_xlate(struct gpio_chip *gc,
176 const struct of_phandle_args *gpiospec,
177 u32 *flags)
178{
179 struct davinci_gpio_controller *chips = dev_get_drvdata(gc->parent);
180 struct davinci_gpio_platform_data *pdata = dev_get_platdata(gc->parent);
181
182 if (gpiospec->args[0] > pdata->ngpio)
183 return -EINVAL;
184
185 if (gc != &chips[gpiospec->args[0] / 32].chip)
186 return -EINVAL;
187
188 if (flags)
189 *flags = gpiospec->args[1];
190
191 return gpiospec->args[0] % 32;
192}
193#endif
194
195static int davinci_gpio_probe(struct platform_device *pdev)
196{
197 int i, base;
198 unsigned ngpio, nbank;
199 struct davinci_gpio_controller *chips;
200 struct davinci_gpio_platform_data *pdata;
201 struct davinci_gpio_regs __iomem *regs;
202 struct device *dev = &pdev->dev;
203 struct resource *res;
204
205 pdata = davinci_gpio_get_pdata(pdev);
206 if (!pdata) {
207 dev_err(dev, "No platform data found\n");
208 return -EINVAL;
209 }
210
211 dev->platform_data = pdata;
212
213 /*
214 * The gpio banks conceptually expose a segmented bitmap,
215 * and "ngpio" is one more than the largest zero-based
216 * bit index that's valid.
217 */
218 ngpio = pdata->ngpio;
219 if (ngpio == 0) {
220 dev_err(dev, "How many GPIOs?\n");
221 return -EINVAL;
222 }
223
224 if (WARN_ON(ARCH_NR_GPIOS < ngpio))
225 ngpio = ARCH_NR_GPIOS;
226
227 nbank = DIV_ROUND_UP(ngpio, 32);
228 chips = devm_kzalloc(dev,
229 nbank * sizeof(struct davinci_gpio_controller),
230 GFP_KERNEL);
231 if (!chips)
232 return -ENOMEM;
233
234 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
235 gpio_base = devm_ioremap_resource(dev, res);
236 if (IS_ERR(gpio_base))
237 return PTR_ERR(gpio_base);
238
239 for (i = 0, base = 0; base < ngpio; i++, base += 32) {
240 chips[i].chip.label = "DaVinci";
241
242 chips[i].chip.direction_input = davinci_direction_in;
243 chips[i].chip.get = davinci_gpio_get;
244 chips[i].chip.direction_output = davinci_direction_out;
245 chips[i].chip.set = davinci_gpio_set;
246
247 chips[i].chip.base = base;
248 chips[i].chip.ngpio = ngpio - base;
249 if (chips[i].chip.ngpio > 32)
250 chips[i].chip.ngpio = 32;
251
252#ifdef CONFIG_OF_GPIO
253 chips[i].chip.of_gpio_n_cells = 2;
254 chips[i].chip.of_xlate = davinci_gpio_of_xlate;
255 chips[i].chip.parent = dev;
256 chips[i].chip.of_node = dev->of_node;
257#endif
258 spin_lock_init(&chips[i].lock);
259
260 regs = gpio2regs(base);
261 if (!regs)
262 return -ENXIO;
263 chips[i].regs = regs;
264 chips[i].set_data = ®s->set_data;
265 chips[i].clr_data = ®s->clr_data;
266 chips[i].in_data = ®s->in_data;
267
268 gpiochip_add_data(&chips[i].chip, &chips[i]);
269 }
270
271 platform_set_drvdata(pdev, chips);
272 davinci_gpio_irq_setup(pdev);
273 return 0;
274}
275
276/*--------------------------------------------------------------------------*/
277/*
278 * We expect irqs will normally be set up as input pins, but they can also be
279 * used as output pins ... which is convenient for testing.
280 *
281 * NOTE: The first few GPIOs also have direct INTC hookups in addition
282 * to their GPIOBNK0 irq, with a bit less overhead.
283 *
284 * All those INTC hookups (direct, plus several IRQ banks) can also
285 * serve as EDMA event triggers.
286 */
287
288static void gpio_irq_disable(struct irq_data *d)
289{
290 struct davinci_gpio_regs __iomem *g = irq2regs(d);
291 u32 mask = (u32) irq_data_get_irq_handler_data(d);
292
293 writel_relaxed(mask, &g->clr_falling);
294 writel_relaxed(mask, &g->clr_rising);
295}
296
297static void gpio_irq_enable(struct irq_data *d)
298{
299 struct davinci_gpio_regs __iomem *g = irq2regs(d);
300 u32 mask = (u32) irq_data_get_irq_handler_data(d);
301 unsigned status = irqd_get_trigger_type(d);
302
303 status &= IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING;
304 if (!status)
305 status = IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING;
306
307 if (status & IRQ_TYPE_EDGE_FALLING)
308 writel_relaxed(mask, &g->set_falling);
309 if (status & IRQ_TYPE_EDGE_RISING)
310 writel_relaxed(mask, &g->set_rising);
311}
312
313static int gpio_irq_type(struct irq_data *d, unsigned trigger)
314{
315 if (trigger & ~(IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING))
316 return -EINVAL;
317
318 return 0;
319}
320
321static struct irq_chip gpio_irqchip = {
322 .name = "GPIO",
323 .irq_enable = gpio_irq_enable,
324 .irq_disable = gpio_irq_disable,
325 .irq_set_type = gpio_irq_type,
326 .flags = IRQCHIP_SET_TYPE_MASKED,
327};
328
329static void gpio_irq_handler(struct irq_desc *desc)
330{
331 unsigned int irq = irq_desc_get_irq(desc);
332 struct davinci_gpio_regs __iomem *g;
333 u32 mask = 0xffff;
334 struct davinci_gpio_controller *d;
335
336 d = (struct davinci_gpio_controller *)irq_desc_get_handler_data(desc);
337 g = (struct davinci_gpio_regs __iomem *)d->regs;
338
339 /* we only care about one bank */
340 if (irq & 1)
341 mask <<= 16;
342
343 /* temporarily mask (level sensitive) parent IRQ */
344 chained_irq_enter(irq_desc_get_chip(desc), desc);
345 while (1) {
346 u32 status;
347 int bit;
348
349 /* ack any irqs */
350 status = readl_relaxed(&g->intstat) & mask;
351 if (!status)
352 break;
353 writel_relaxed(status, &g->intstat);
354
355 /* now demux them to the right lowlevel handler */
356
357 while (status) {
358 bit = __ffs(status);
359 status &= ~BIT(bit);
360 generic_handle_irq(
361 irq_find_mapping(d->irq_domain,
362 d->chip.base + bit));
363 }
364 }
365 chained_irq_exit(irq_desc_get_chip(desc), desc);
366 /* now it may re-trigger */
367}
368
369static int gpio_to_irq_banked(struct gpio_chip *chip, unsigned offset)
370{
371 struct davinci_gpio_controller *d = gpiochip_get_data(chip);
372
373 if (d->irq_domain)
374 return irq_create_mapping(d->irq_domain, d->chip.base + offset);
375 else
376 return -ENXIO;
377}
378
379static int gpio_to_irq_unbanked(struct gpio_chip *chip, unsigned offset)
380{
381 struct davinci_gpio_controller *d = gpiochip_get_data(chip);
382
383 /*
384 * NOTE: we assume for now that only irqs in the first gpio_chip
385 * can provide direct-mapped IRQs to AINTC (up to 32 GPIOs).
386 */
387 if (offset < d->gpio_unbanked)
388 return d->gpio_irq + offset;
389 else
390 return -ENODEV;
391}
392
393static int gpio_irq_type_unbanked(struct irq_data *data, unsigned trigger)
394{
395 struct davinci_gpio_controller *d;
396 struct davinci_gpio_regs __iomem *g;
397 u32 mask;
398
399 d = (struct davinci_gpio_controller *)irq_data_get_irq_handler_data(data);
400 g = (struct davinci_gpio_regs __iomem *)d->regs;
401 mask = __gpio_mask(data->irq - d->gpio_irq);
402
403 if (trigger & ~(IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING))
404 return -EINVAL;
405
406 writel_relaxed(mask, (trigger & IRQ_TYPE_EDGE_FALLING)
407 ? &g->set_falling : &g->clr_falling);
408 writel_relaxed(mask, (trigger & IRQ_TYPE_EDGE_RISING)
409 ? &g->set_rising : &g->clr_rising);
410
411 return 0;
412}
413
414static int
415davinci_gpio_irq_map(struct irq_domain *d, unsigned int irq,
416 irq_hw_number_t hw)
417{
418 struct davinci_gpio_regs __iomem *g = gpio2regs(hw);
419
420 irq_set_chip_and_handler_name(irq, &gpio_irqchip, handle_simple_irq,
421 "davinci_gpio");
422 irq_set_irq_type(irq, IRQ_TYPE_NONE);
423 irq_set_chip_data(irq, (__force void *)g);
424 irq_set_handler_data(irq, (void *)__gpio_mask(hw));
425
426 return 0;
427}
428
429static const struct irq_domain_ops davinci_gpio_irq_ops = {
430 .map = davinci_gpio_irq_map,
431 .xlate = irq_domain_xlate_onetwocell,
432};
433
434static struct irq_chip *davinci_gpio_get_irq_chip(unsigned int irq)
435{
436 static struct irq_chip_type gpio_unbanked;
437
438 gpio_unbanked = *irq_data_get_chip_type(irq_get_irq_data(irq));
439
440 return &gpio_unbanked.chip;
441};
442
443static struct irq_chip *keystone_gpio_get_irq_chip(unsigned int irq)
444{
445 static struct irq_chip gpio_unbanked;
446
447 gpio_unbanked = *irq_get_chip(irq);
448 return &gpio_unbanked;
449};
450
451static const struct of_device_id davinci_gpio_ids[];
452
453/*
454 * NOTE: for suspend/resume, probably best to make a platform_device with
455 * suspend_late/resume_resume calls hooking into results of the set_wake()
456 * calls ... so if no gpios are wakeup events the clock can be disabled,
457 * with outputs left at previously set levels, and so that VDD3P3V.IOPWDN0
458 * (dm6446) can be set appropriately for GPIOV33 pins.
459 */
460
461static int davinci_gpio_irq_setup(struct platform_device *pdev)
462{
463 unsigned gpio, bank;
464 int irq;
465 struct clk *clk;
466 u32 binten = 0;
467 unsigned ngpio, bank_irq;
468 struct device *dev = &pdev->dev;
469 struct resource *res;
470 struct davinci_gpio_controller *chips = platform_get_drvdata(pdev);
471 struct davinci_gpio_platform_data *pdata = dev->platform_data;
472 struct davinci_gpio_regs __iomem *g;
473 struct irq_domain *irq_domain = NULL;
474 const struct of_device_id *match;
475 struct irq_chip *irq_chip;
476 gpio_get_irq_chip_cb_t gpio_get_irq_chip;
477
478 /*
479 * Use davinci_gpio_get_irq_chip by default to handle non DT cases
480 */
481 gpio_get_irq_chip = davinci_gpio_get_irq_chip;
482 match = of_match_device(of_match_ptr(davinci_gpio_ids),
483 dev);
484 if (match)
485 gpio_get_irq_chip = (gpio_get_irq_chip_cb_t)match->data;
486
487 ngpio = pdata->ngpio;
488 res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
489 if (!res) {
490 dev_err(dev, "Invalid IRQ resource\n");
491 return -EBUSY;
492 }
493
494 bank_irq = res->start;
495
496 if (!bank_irq) {
497 dev_err(dev, "Invalid IRQ resource\n");
498 return -ENODEV;
499 }
500
501 clk = devm_clk_get(dev, "gpio");
502 if (IS_ERR(clk)) {
503 printk(KERN_ERR "Error %ld getting gpio clock?\n",
504 PTR_ERR(clk));
505 return PTR_ERR(clk);
506 }
507 clk_prepare_enable(clk);
508
509 if (!pdata->gpio_unbanked) {
510 irq = irq_alloc_descs(-1, 0, ngpio, 0);
511 if (irq < 0) {
512 dev_err(dev, "Couldn't allocate IRQ numbers\n");
513 return irq;
514 }
515
516 irq_domain = irq_domain_add_legacy(dev->of_node, ngpio, irq, 0,
517 &davinci_gpio_irq_ops,
518 chips);
519 if (!irq_domain) {
520 dev_err(dev, "Couldn't register an IRQ domain\n");
521 return -ENODEV;
522 }
523 }
524
525 /*
526 * Arrange gpio_to_irq() support, handling either direct IRQs or
527 * banked IRQs. Having GPIOs in the first GPIO bank use direct
528 * IRQs, while the others use banked IRQs, would need some setup
529 * tweaks to recognize hardware which can do that.
530 */
531 for (gpio = 0, bank = 0; gpio < ngpio; bank++, gpio += 32) {
532 chips[bank].chip.to_irq = gpio_to_irq_banked;
533 chips[bank].irq_domain = irq_domain;
534 }
535
536 /*
537 * AINTC can handle direct/unbanked IRQs for GPIOs, with the GPIO
538 * controller only handling trigger modes. We currently assume no
539 * IRQ mux conflicts; gpio_irq_type_unbanked() is only for GPIOs.
540 */
541 if (pdata->gpio_unbanked) {
542 /* pass "bank 0" GPIO IRQs to AINTC */
543 chips[0].chip.to_irq = gpio_to_irq_unbanked;
544 chips[0].gpio_irq = bank_irq;
545 chips[0].gpio_unbanked = pdata->gpio_unbanked;
546 binten = GENMASK(pdata->gpio_unbanked / 16, 0);
547
548 /* AINTC handles mask/unmask; GPIO handles triggering */
549 irq = bank_irq;
550 irq_chip = gpio_get_irq_chip(irq);
551 irq_chip->name = "GPIO-AINTC";
552 irq_chip->irq_set_type = gpio_irq_type_unbanked;
553
554 /* default trigger: both edges */
555 g = gpio2regs(0);
556 writel_relaxed(~0, &g->set_falling);
557 writel_relaxed(~0, &g->set_rising);
558
559 /* set the direct IRQs up to use that irqchip */
560 for (gpio = 0; gpio < pdata->gpio_unbanked; gpio++, irq++) {
561 irq_set_chip(irq, irq_chip);
562 irq_set_handler_data(irq, &chips[gpio / 32]);
563 irq_set_status_flags(irq, IRQ_TYPE_EDGE_BOTH);
564 }
565
566 goto done;
567 }
568
569 /*
570 * Or, AINTC can handle IRQs for banks of 16 GPIO IRQs, which we
571 * then chain through our own handler.
572 */
573 for (gpio = 0, bank = 0; gpio < ngpio; bank++, bank_irq++, gpio += 16) {
574 /* disabled by default, enabled only as needed */
575 g = gpio2regs(gpio);
576 writel_relaxed(~0, &g->clr_falling);
577 writel_relaxed(~0, &g->clr_rising);
578
579 /*
580 * Each chip handles 32 gpios, and each irq bank consists of 16
581 * gpio irqs. Pass the irq bank's corresponding controller to
582 * the chained irq handler.
583 */
584 irq_set_chained_handler_and_data(bank_irq, gpio_irq_handler,
585 &chips[gpio / 32]);
586
587 binten |= BIT(bank);
588 }
589
590done:
591 /*
592 * BINTEN -- per-bank interrupt enable. genirq would also let these
593 * bits be set/cleared dynamically.
594 */
595 writel_relaxed(binten, gpio_base + BINTEN);
596
597 return 0;
598}
599
600#if IS_ENABLED(CONFIG_OF)
601static const struct of_device_id davinci_gpio_ids[] = {
602 { .compatible = "ti,keystone-gpio", keystone_gpio_get_irq_chip},
603 { .compatible = "ti,dm6441-gpio", davinci_gpio_get_irq_chip},
604 { /* sentinel */ },
605};
606MODULE_DEVICE_TABLE(of, davinci_gpio_ids);
607#endif
608
609static struct platform_driver davinci_gpio_driver = {
610 .probe = davinci_gpio_probe,
611 .driver = {
612 .name = "davinci_gpio",
613 .of_match_table = of_match_ptr(davinci_gpio_ids),
614 },
615};
616
617/**
618 * GPIO driver registration needs to be done before machine_init functions
619 * access GPIO. Hence davinci_gpio_drv_reg() is a postcore_initcall.
620 */
621static int __init davinci_gpio_drv_reg(void)
622{
623 return platform_driver_register(&davinci_gpio_driver);
624}
625postcore_initcall(davinci_gpio_drv_reg);
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * TI DaVinci GPIO Support
4 *
5 * Copyright (c) 2006-2007 David Brownell
6 * Copyright (c) 2007, MontaVista Software, Inc. <source@mvista.com>
7 */
8
9#include <linux/gpio/driver.h>
10#include <linux/errno.h>
11#include <linux/kernel.h>
12#include <linux/clk.h>
13#include <linux/err.h>
14#include <linux/io.h>
15#include <linux/irq.h>
16#include <linux/irqdomain.h>
17#include <linux/module.h>
18#include <linux/of.h>
19#include <linux/of_device.h>
20#include <linux/pinctrl/consumer.h>
21#include <linux/platform_device.h>
22#include <linux/platform_data/gpio-davinci.h>
23#include <linux/irqchip/chained_irq.h>
24#include <linux/spinlock.h>
25
26#include <asm-generic/gpio.h>
27
28#define MAX_REGS_BANKS 5
29#define MAX_INT_PER_BANK 32
30
31struct davinci_gpio_regs {
32 u32 dir;
33 u32 out_data;
34 u32 set_data;
35 u32 clr_data;
36 u32 in_data;
37 u32 set_rising;
38 u32 clr_rising;
39 u32 set_falling;
40 u32 clr_falling;
41 u32 intstat;
42};
43
44typedef struct irq_chip *(*gpio_get_irq_chip_cb_t)(unsigned int irq);
45
46#define BINTEN 0x8 /* GPIO Interrupt Per-Bank Enable Register */
47
48static void __iomem *gpio_base;
49static unsigned int offset_array[5] = {0x10, 0x38, 0x60, 0x88, 0xb0};
50
51struct davinci_gpio_irq_data {
52 void __iomem *regs;
53 struct davinci_gpio_controller *chip;
54 int bank_num;
55};
56
57struct davinci_gpio_controller {
58 struct gpio_chip chip;
59 struct irq_domain *irq_domain;
60 /* Serialize access to GPIO registers */
61 spinlock_t lock;
62 void __iomem *regs[MAX_REGS_BANKS];
63 int gpio_unbanked;
64 int irqs[MAX_INT_PER_BANK];
65};
66
67static inline u32 __gpio_mask(unsigned gpio)
68{
69 return 1 << (gpio % 32);
70}
71
72static inline struct davinci_gpio_regs __iomem *irq2regs(struct irq_data *d)
73{
74 struct davinci_gpio_regs __iomem *g;
75
76 g = (__force struct davinci_gpio_regs __iomem *)irq_data_get_irq_chip_data(d);
77
78 return g;
79}
80
81static int davinci_gpio_irq_setup(struct platform_device *pdev);
82
83/*--------------------------------------------------------------------------*/
84
85/* board setup code *MUST* setup pinmux and enable the GPIO clock. */
86static inline int __davinci_direction(struct gpio_chip *chip,
87 unsigned offset, bool out, int value)
88{
89 struct davinci_gpio_controller *d = gpiochip_get_data(chip);
90 struct davinci_gpio_regs __iomem *g;
91 unsigned long flags;
92 u32 temp;
93 int bank = offset / 32;
94 u32 mask = __gpio_mask(offset);
95
96 g = d->regs[bank];
97 spin_lock_irqsave(&d->lock, flags);
98 temp = readl_relaxed(&g->dir);
99 if (out) {
100 temp &= ~mask;
101 writel_relaxed(mask, value ? &g->set_data : &g->clr_data);
102 } else {
103 temp |= mask;
104 }
105 writel_relaxed(temp, &g->dir);
106 spin_unlock_irqrestore(&d->lock, flags);
107
108 return 0;
109}
110
111static int davinci_direction_in(struct gpio_chip *chip, unsigned offset)
112{
113 return __davinci_direction(chip, offset, false, 0);
114}
115
116static int
117davinci_direction_out(struct gpio_chip *chip, unsigned offset, int value)
118{
119 return __davinci_direction(chip, offset, true, value);
120}
121
122/*
123 * Read the pin's value (works even if it's set up as output);
124 * returns zero/nonzero.
125 *
126 * Note that changes are synched to the GPIO clock, so reading values back
127 * right after you've set them may give old values.
128 */
129static int davinci_gpio_get(struct gpio_chip *chip, unsigned offset)
130{
131 struct davinci_gpio_controller *d = gpiochip_get_data(chip);
132 struct davinci_gpio_regs __iomem *g;
133 int bank = offset / 32;
134
135 g = d->regs[bank];
136
137 return !!(__gpio_mask(offset) & readl_relaxed(&g->in_data));
138}
139
140/*
141 * Assuming the pin is muxed as a gpio output, set its output value.
142 */
143static void
144davinci_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
145{
146 struct davinci_gpio_controller *d = gpiochip_get_data(chip);
147 struct davinci_gpio_regs __iomem *g;
148 int bank = offset / 32;
149
150 g = d->regs[bank];
151
152 writel_relaxed(__gpio_mask(offset),
153 value ? &g->set_data : &g->clr_data);
154}
155
156static struct davinci_gpio_platform_data *
157davinci_gpio_get_pdata(struct platform_device *pdev)
158{
159 struct device_node *dn = pdev->dev.of_node;
160 struct davinci_gpio_platform_data *pdata;
161 int ret;
162 u32 val;
163
164 if (!IS_ENABLED(CONFIG_OF) || !pdev->dev.of_node)
165 return dev_get_platdata(&pdev->dev);
166
167 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
168 if (!pdata)
169 return NULL;
170
171 ret = of_property_read_u32(dn, "ti,ngpio", &val);
172 if (ret)
173 goto of_err;
174
175 pdata->ngpio = val;
176
177 ret = of_property_read_u32(dn, "ti,davinci-gpio-unbanked", &val);
178 if (ret)
179 goto of_err;
180
181 pdata->gpio_unbanked = val;
182
183 return pdata;
184
185of_err:
186 dev_err(&pdev->dev, "Populating pdata from DT failed: err %d\n", ret);
187 return NULL;
188}
189
190static int davinci_gpio_probe(struct platform_device *pdev)
191{
192 int bank, i, ret = 0;
193 unsigned int ngpio, nbank, nirq;
194 struct davinci_gpio_controller *chips;
195 struct davinci_gpio_platform_data *pdata;
196 struct device *dev = &pdev->dev;
197
198 pdata = davinci_gpio_get_pdata(pdev);
199 if (!pdata) {
200 dev_err(dev, "No platform data found\n");
201 return -EINVAL;
202 }
203
204 dev->platform_data = pdata;
205
206 /*
207 * The gpio banks conceptually expose a segmented bitmap,
208 * and "ngpio" is one more than the largest zero-based
209 * bit index that's valid.
210 */
211 ngpio = pdata->ngpio;
212 if (ngpio == 0) {
213 dev_err(dev, "How many GPIOs?\n");
214 return -EINVAL;
215 }
216
217 if (WARN_ON(ARCH_NR_GPIOS < ngpio))
218 ngpio = ARCH_NR_GPIOS;
219
220 /*
221 * If there are unbanked interrupts then the number of
222 * interrupts is equal to number of gpios else all are banked so
223 * number of interrupts is equal to number of banks(each with 16 gpios)
224 */
225 if (pdata->gpio_unbanked)
226 nirq = pdata->gpio_unbanked;
227 else
228 nirq = DIV_ROUND_UP(ngpio, 16);
229
230 chips = devm_kzalloc(dev, sizeof(*chips), GFP_KERNEL);
231 if (!chips)
232 return -ENOMEM;
233
234 gpio_base = devm_platform_ioremap_resource(pdev, 0);
235 if (IS_ERR(gpio_base))
236 return PTR_ERR(gpio_base);
237
238 for (i = 0; i < nirq; i++) {
239 chips->irqs[i] = platform_get_irq(pdev, i);
240 if (chips->irqs[i] < 0) {
241 if (chips->irqs[i] != -EPROBE_DEFER)
242 dev_info(dev, "IRQ not populated, err = %d\n",
243 chips->irqs[i]);
244 return chips->irqs[i];
245 }
246 }
247
248 chips->chip.label = dev_name(dev);
249
250 chips->chip.direction_input = davinci_direction_in;
251 chips->chip.get = davinci_gpio_get;
252 chips->chip.direction_output = davinci_direction_out;
253 chips->chip.set = davinci_gpio_set;
254
255 chips->chip.ngpio = ngpio;
256 chips->chip.base = pdata->no_auto_base ? pdata->base : -1;
257
258#ifdef CONFIG_OF_GPIO
259 chips->chip.of_gpio_n_cells = 2;
260 chips->chip.parent = dev;
261 chips->chip.of_node = dev->of_node;
262 chips->chip.request = gpiochip_generic_request;
263 chips->chip.free = gpiochip_generic_free;
264#endif
265 spin_lock_init(&chips->lock);
266
267 nbank = DIV_ROUND_UP(ngpio, 32);
268 for (bank = 0; bank < nbank; bank++)
269 chips->regs[bank] = gpio_base + offset_array[bank];
270
271 ret = devm_gpiochip_add_data(dev, &chips->chip, chips);
272 if (ret)
273 return ret;
274
275 platform_set_drvdata(pdev, chips);
276 ret = davinci_gpio_irq_setup(pdev);
277 if (ret)
278 return ret;
279
280 return 0;
281}
282
283/*--------------------------------------------------------------------------*/
284/*
285 * We expect irqs will normally be set up as input pins, but they can also be
286 * used as output pins ... which is convenient for testing.
287 *
288 * NOTE: The first few GPIOs also have direct INTC hookups in addition
289 * to their GPIOBNK0 irq, with a bit less overhead.
290 *
291 * All those INTC hookups (direct, plus several IRQ banks) can also
292 * serve as EDMA event triggers.
293 */
294
295static void gpio_irq_disable(struct irq_data *d)
296{
297 struct davinci_gpio_regs __iomem *g = irq2regs(d);
298 uintptr_t mask = (uintptr_t)irq_data_get_irq_handler_data(d);
299
300 writel_relaxed(mask, &g->clr_falling);
301 writel_relaxed(mask, &g->clr_rising);
302}
303
304static void gpio_irq_enable(struct irq_data *d)
305{
306 struct davinci_gpio_regs __iomem *g = irq2regs(d);
307 uintptr_t mask = (uintptr_t)irq_data_get_irq_handler_data(d);
308 unsigned status = irqd_get_trigger_type(d);
309
310 status &= IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING;
311 if (!status)
312 status = IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING;
313
314 if (status & IRQ_TYPE_EDGE_FALLING)
315 writel_relaxed(mask, &g->set_falling);
316 if (status & IRQ_TYPE_EDGE_RISING)
317 writel_relaxed(mask, &g->set_rising);
318}
319
320static int gpio_irq_type(struct irq_data *d, unsigned trigger)
321{
322 if (trigger & ~(IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING))
323 return -EINVAL;
324
325 return 0;
326}
327
328static struct irq_chip gpio_irqchip = {
329 .name = "GPIO",
330 .irq_enable = gpio_irq_enable,
331 .irq_disable = gpio_irq_disable,
332 .irq_set_type = gpio_irq_type,
333 .flags = IRQCHIP_SET_TYPE_MASKED,
334};
335
336static void gpio_irq_handler(struct irq_desc *desc)
337{
338 struct davinci_gpio_regs __iomem *g;
339 u32 mask = 0xffff;
340 int bank_num;
341 struct davinci_gpio_controller *d;
342 struct davinci_gpio_irq_data *irqdata;
343
344 irqdata = (struct davinci_gpio_irq_data *)irq_desc_get_handler_data(desc);
345 bank_num = irqdata->bank_num;
346 g = irqdata->regs;
347 d = irqdata->chip;
348
349 /* we only care about one bank */
350 if ((bank_num % 2) == 1)
351 mask <<= 16;
352
353 /* temporarily mask (level sensitive) parent IRQ */
354 chained_irq_enter(irq_desc_get_chip(desc), desc);
355 while (1) {
356 u32 status;
357 int bit;
358 irq_hw_number_t hw_irq;
359
360 /* ack any irqs */
361 status = readl_relaxed(&g->intstat) & mask;
362 if (!status)
363 break;
364 writel_relaxed(status, &g->intstat);
365
366 /* now demux them to the right lowlevel handler */
367
368 while (status) {
369 bit = __ffs(status);
370 status &= ~BIT(bit);
371 /* Max number of gpios per controller is 144 so
372 * hw_irq will be in [0..143]
373 */
374 hw_irq = (bank_num / 2) * 32 + bit;
375
376 generic_handle_irq(
377 irq_find_mapping(d->irq_domain, hw_irq));
378 }
379 }
380 chained_irq_exit(irq_desc_get_chip(desc), desc);
381 /* now it may re-trigger */
382}
383
384static int gpio_to_irq_banked(struct gpio_chip *chip, unsigned offset)
385{
386 struct davinci_gpio_controller *d = gpiochip_get_data(chip);
387
388 if (d->irq_domain)
389 return irq_create_mapping(d->irq_domain, offset);
390 else
391 return -ENXIO;
392}
393
394static int gpio_to_irq_unbanked(struct gpio_chip *chip, unsigned offset)
395{
396 struct davinci_gpio_controller *d = gpiochip_get_data(chip);
397
398 /*
399 * NOTE: we assume for now that only irqs in the first gpio_chip
400 * can provide direct-mapped IRQs to AINTC (up to 32 GPIOs).
401 */
402 if (offset < d->gpio_unbanked)
403 return d->irqs[offset];
404 else
405 return -ENODEV;
406}
407
408static int gpio_irq_type_unbanked(struct irq_data *data, unsigned trigger)
409{
410 struct davinci_gpio_controller *d;
411 struct davinci_gpio_regs __iomem *g;
412 u32 mask, i;
413
414 d = (struct davinci_gpio_controller *)irq_data_get_irq_handler_data(data);
415 g = (struct davinci_gpio_regs __iomem *)d->regs[0];
416 for (i = 0; i < MAX_INT_PER_BANK; i++)
417 if (data->irq == d->irqs[i])
418 break;
419
420 if (i == MAX_INT_PER_BANK)
421 return -EINVAL;
422
423 mask = __gpio_mask(i);
424
425 if (trigger & ~(IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING))
426 return -EINVAL;
427
428 writel_relaxed(mask, (trigger & IRQ_TYPE_EDGE_FALLING)
429 ? &g->set_falling : &g->clr_falling);
430 writel_relaxed(mask, (trigger & IRQ_TYPE_EDGE_RISING)
431 ? &g->set_rising : &g->clr_rising);
432
433 return 0;
434}
435
436static int
437davinci_gpio_irq_map(struct irq_domain *d, unsigned int irq,
438 irq_hw_number_t hw)
439{
440 struct davinci_gpio_controller *chips =
441 (struct davinci_gpio_controller *)d->host_data;
442 struct davinci_gpio_regs __iomem *g = chips->regs[hw / 32];
443
444 irq_set_chip_and_handler_name(irq, &gpio_irqchip, handle_simple_irq,
445 "davinci_gpio");
446 irq_set_irq_type(irq, IRQ_TYPE_NONE);
447 irq_set_chip_data(irq, (__force void *)g);
448 irq_set_handler_data(irq, (void *)(uintptr_t)__gpio_mask(hw));
449
450 return 0;
451}
452
453static const struct irq_domain_ops davinci_gpio_irq_ops = {
454 .map = davinci_gpio_irq_map,
455 .xlate = irq_domain_xlate_onetwocell,
456};
457
458static struct irq_chip *davinci_gpio_get_irq_chip(unsigned int irq)
459{
460 static struct irq_chip_type gpio_unbanked;
461
462 gpio_unbanked = *irq_data_get_chip_type(irq_get_irq_data(irq));
463
464 return &gpio_unbanked.chip;
465};
466
467static struct irq_chip *keystone_gpio_get_irq_chip(unsigned int irq)
468{
469 static struct irq_chip gpio_unbanked;
470
471 gpio_unbanked = *irq_get_chip(irq);
472 return &gpio_unbanked;
473};
474
475static const struct of_device_id davinci_gpio_ids[];
476
477/*
478 * NOTE: for suspend/resume, probably best to make a platform_device with
479 * suspend_late/resume_resume calls hooking into results of the set_wake()
480 * calls ... so if no gpios are wakeup events the clock can be disabled,
481 * with outputs left at previously set levels, and so that VDD3P3V.IOPWDN0
482 * (dm6446) can be set appropriately for GPIOV33 pins.
483 */
484
485static int davinci_gpio_irq_setup(struct platform_device *pdev)
486{
487 unsigned gpio, bank;
488 int irq;
489 int ret;
490 struct clk *clk;
491 u32 binten = 0;
492 unsigned ngpio;
493 struct device *dev = &pdev->dev;
494 struct davinci_gpio_controller *chips = platform_get_drvdata(pdev);
495 struct davinci_gpio_platform_data *pdata = dev->platform_data;
496 struct davinci_gpio_regs __iomem *g;
497 struct irq_domain *irq_domain = NULL;
498 const struct of_device_id *match;
499 struct irq_chip *irq_chip;
500 struct davinci_gpio_irq_data *irqdata;
501 gpio_get_irq_chip_cb_t gpio_get_irq_chip;
502
503 /*
504 * Use davinci_gpio_get_irq_chip by default to handle non DT cases
505 */
506 gpio_get_irq_chip = davinci_gpio_get_irq_chip;
507 match = of_match_device(of_match_ptr(davinci_gpio_ids),
508 dev);
509 if (match)
510 gpio_get_irq_chip = (gpio_get_irq_chip_cb_t)match->data;
511
512 ngpio = pdata->ngpio;
513
514 clk = devm_clk_get(dev, "gpio");
515 if (IS_ERR(clk)) {
516 dev_err(dev, "Error %ld getting gpio clock\n", PTR_ERR(clk));
517 return PTR_ERR(clk);
518 }
519
520 ret = clk_prepare_enable(clk);
521 if (ret)
522 return ret;
523
524 if (!pdata->gpio_unbanked) {
525 irq = devm_irq_alloc_descs(dev, -1, 0, ngpio, 0);
526 if (irq < 0) {
527 dev_err(dev, "Couldn't allocate IRQ numbers\n");
528 clk_disable_unprepare(clk);
529 return irq;
530 }
531
532 irq_domain = irq_domain_add_legacy(dev->of_node, ngpio, irq, 0,
533 &davinci_gpio_irq_ops,
534 chips);
535 if (!irq_domain) {
536 dev_err(dev, "Couldn't register an IRQ domain\n");
537 clk_disable_unprepare(clk);
538 return -ENODEV;
539 }
540 }
541
542 /*
543 * Arrange gpio_to_irq() support, handling either direct IRQs or
544 * banked IRQs. Having GPIOs in the first GPIO bank use direct
545 * IRQs, while the others use banked IRQs, would need some setup
546 * tweaks to recognize hardware which can do that.
547 */
548 chips->chip.to_irq = gpio_to_irq_banked;
549 chips->irq_domain = irq_domain;
550
551 /*
552 * AINTC can handle direct/unbanked IRQs for GPIOs, with the GPIO
553 * controller only handling trigger modes. We currently assume no
554 * IRQ mux conflicts; gpio_irq_type_unbanked() is only for GPIOs.
555 */
556 if (pdata->gpio_unbanked) {
557 /* pass "bank 0" GPIO IRQs to AINTC */
558 chips->chip.to_irq = gpio_to_irq_unbanked;
559 chips->gpio_unbanked = pdata->gpio_unbanked;
560 binten = GENMASK(pdata->gpio_unbanked / 16, 0);
561
562 /* AINTC handles mask/unmask; GPIO handles triggering */
563 irq = chips->irqs[0];
564 irq_chip = gpio_get_irq_chip(irq);
565 irq_chip->name = "GPIO-AINTC";
566 irq_chip->irq_set_type = gpio_irq_type_unbanked;
567
568 /* default trigger: both edges */
569 g = chips->regs[0];
570 writel_relaxed(~0, &g->set_falling);
571 writel_relaxed(~0, &g->set_rising);
572
573 /* set the direct IRQs up to use that irqchip */
574 for (gpio = 0; gpio < pdata->gpio_unbanked; gpio++) {
575 irq_set_chip(chips->irqs[gpio], irq_chip);
576 irq_set_handler_data(chips->irqs[gpio], chips);
577 irq_set_status_flags(chips->irqs[gpio],
578 IRQ_TYPE_EDGE_BOTH);
579 }
580
581 goto done;
582 }
583
584 /*
585 * Or, AINTC can handle IRQs for banks of 16 GPIO IRQs, which we
586 * then chain through our own handler.
587 */
588 for (gpio = 0, bank = 0; gpio < ngpio; bank++, gpio += 16) {
589 /* disabled by default, enabled only as needed
590 * There are register sets for 32 GPIOs. 2 banks of 16
591 * GPIOs are covered by each set of registers hence divide by 2
592 */
593 g = chips->regs[bank / 2];
594 writel_relaxed(~0, &g->clr_falling);
595 writel_relaxed(~0, &g->clr_rising);
596
597 /*
598 * Each chip handles 32 gpios, and each irq bank consists of 16
599 * gpio irqs. Pass the irq bank's corresponding controller to
600 * the chained irq handler.
601 */
602 irqdata = devm_kzalloc(&pdev->dev,
603 sizeof(struct
604 davinci_gpio_irq_data),
605 GFP_KERNEL);
606 if (!irqdata) {
607 clk_disable_unprepare(clk);
608 return -ENOMEM;
609 }
610
611 irqdata->regs = g;
612 irqdata->bank_num = bank;
613 irqdata->chip = chips;
614
615 irq_set_chained_handler_and_data(chips->irqs[bank],
616 gpio_irq_handler, irqdata);
617
618 binten |= BIT(bank);
619 }
620
621done:
622 /*
623 * BINTEN -- per-bank interrupt enable. genirq would also let these
624 * bits be set/cleared dynamically.
625 */
626 writel_relaxed(binten, gpio_base + BINTEN);
627
628 return 0;
629}
630
631static const struct of_device_id davinci_gpio_ids[] = {
632 { .compatible = "ti,keystone-gpio", keystone_gpio_get_irq_chip},
633 { .compatible = "ti,am654-gpio", keystone_gpio_get_irq_chip},
634 { .compatible = "ti,dm6441-gpio", davinci_gpio_get_irq_chip},
635 { /* sentinel */ },
636};
637MODULE_DEVICE_TABLE(of, davinci_gpio_ids);
638
639static struct platform_driver davinci_gpio_driver = {
640 .probe = davinci_gpio_probe,
641 .driver = {
642 .name = "davinci_gpio",
643 .of_match_table = of_match_ptr(davinci_gpio_ids),
644 },
645};
646
647/**
648 * GPIO driver registration needs to be done before machine_init functions
649 * access GPIO. Hence davinci_gpio_drv_reg() is a postcore_initcall.
650 */
651static int __init davinci_gpio_drv_reg(void)
652{
653 return platform_driver_register(&davinci_gpio_driver);
654}
655postcore_initcall(davinci_gpio_drv_reg);