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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
19#include <asm/mach/irq.h>
20
21struct davinci_gpio_regs {
22 u32 dir;
23 u32 out_data;
24 u32 set_data;
25 u32 clr_data;
26 u32 in_data;
27 u32 set_rising;
28 u32 clr_rising;
29 u32 set_falling;
30 u32 clr_falling;
31 u32 intstat;
32};
33
34#define chip2controller(chip) \
35 container_of(chip, struct davinci_gpio_controller, chip)
36
37static struct davinci_gpio_controller chips[DIV_ROUND_UP(DAVINCI_N_GPIO, 32)];
38static void __iomem *gpio_base;
39
40static struct davinci_gpio_regs __iomem __init *gpio2regs(unsigned gpio)
41{
42 void __iomem *ptr;
43
44 if (gpio < 32 * 1)
45 ptr = gpio_base + 0x10;
46 else if (gpio < 32 * 2)
47 ptr = gpio_base + 0x38;
48 else if (gpio < 32 * 3)
49 ptr = gpio_base + 0x60;
50 else if (gpio < 32 * 4)
51 ptr = gpio_base + 0x88;
52 else if (gpio < 32 * 5)
53 ptr = gpio_base + 0xb0;
54 else
55 ptr = NULL;
56 return ptr;
57}
58
59static inline struct davinci_gpio_regs __iomem *irq2regs(int irq)
60{
61 struct davinci_gpio_regs __iomem *g;
62
63 g = (__force struct davinci_gpio_regs __iomem *)irq_get_chip_data(irq);
64
65 return g;
66}
67
68static int __init davinci_gpio_irq_setup(void);
69
70/*--------------------------------------------------------------------------*/
71
72/* board setup code *MUST* setup pinmux and enable the GPIO clock. */
73static inline int __davinci_direction(struct gpio_chip *chip,
74 unsigned offset, bool out, int value)
75{
76 struct davinci_gpio_controller *d = chip2controller(chip);
77 struct davinci_gpio_regs __iomem *g = d->regs;
78 unsigned long flags;
79 u32 temp;
80 u32 mask = 1 << offset;
81
82 spin_lock_irqsave(&d->lock, flags);
83 temp = __raw_readl(&g->dir);
84 if (out) {
85 temp &= ~mask;
86 __raw_writel(mask, value ? &g->set_data : &g->clr_data);
87 } else {
88 temp |= mask;
89 }
90 __raw_writel(temp, &g->dir);
91 spin_unlock_irqrestore(&d->lock, flags);
92
93 return 0;
94}
95
96static int davinci_direction_in(struct gpio_chip *chip, unsigned offset)
97{
98 return __davinci_direction(chip, offset, false, 0);
99}
100
101static int
102davinci_direction_out(struct gpio_chip *chip, unsigned offset, int value)
103{
104 return __davinci_direction(chip, offset, true, value);
105}
106
107/*
108 * Read the pin's value (works even if it's set up as output);
109 * returns zero/nonzero.
110 *
111 * Note that changes are synched to the GPIO clock, so reading values back
112 * right after you've set them may give old values.
113 */
114static int davinci_gpio_get(struct gpio_chip *chip, unsigned offset)
115{
116 struct davinci_gpio_controller *d = chip2controller(chip);
117 struct davinci_gpio_regs __iomem *g = d->regs;
118
119 return (1 << offset) & __raw_readl(&g->in_data);
120}
121
122/*
123 * Assuming the pin is muxed as a gpio output, set its output value.
124 */
125static void
126davinci_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
127{
128 struct davinci_gpio_controller *d = chip2controller(chip);
129 struct davinci_gpio_regs __iomem *g = d->regs;
130
131 __raw_writel((1 << offset), value ? &g->set_data : &g->clr_data);
132}
133
134static int __init davinci_gpio_setup(void)
135{
136 int i, base;
137 unsigned ngpio;
138 struct davinci_soc_info *soc_info = &davinci_soc_info;
139 struct davinci_gpio_regs *regs;
140
141 if (soc_info->gpio_type != GPIO_TYPE_DAVINCI)
142 return 0;
143
144 /*
145 * The gpio banks conceptually expose a segmented bitmap,
146 * and "ngpio" is one more than the largest zero-based
147 * bit index that's valid.
148 */
149 ngpio = soc_info->gpio_num;
150 if (ngpio == 0) {
151 pr_err("GPIO setup: how many GPIOs?\n");
152 return -EINVAL;
153 }
154
155 if (WARN_ON(DAVINCI_N_GPIO < ngpio))
156 ngpio = DAVINCI_N_GPIO;
157
158 gpio_base = ioremap(soc_info->gpio_base, SZ_4K);
159 if (WARN_ON(!gpio_base))
160 return -ENOMEM;
161
162 for (i = 0, base = 0; base < ngpio; i++, base += 32) {
163 chips[i].chip.label = "DaVinci";
164
165 chips[i].chip.direction_input = davinci_direction_in;
166 chips[i].chip.get = davinci_gpio_get;
167 chips[i].chip.direction_output = davinci_direction_out;
168 chips[i].chip.set = davinci_gpio_set;
169
170 chips[i].chip.base = base;
171 chips[i].chip.ngpio = ngpio - base;
172 if (chips[i].chip.ngpio > 32)
173 chips[i].chip.ngpio = 32;
174
175 spin_lock_init(&chips[i].lock);
176
177 regs = gpio2regs(base);
178 chips[i].regs = regs;
179 chips[i].set_data = ®s->set_data;
180 chips[i].clr_data = ®s->clr_data;
181 chips[i].in_data = ®s->in_data;
182
183 gpiochip_add(&chips[i].chip);
184 }
185
186 soc_info->gpio_ctlrs = chips;
187 soc_info->gpio_ctlrs_num = DIV_ROUND_UP(ngpio, 32);
188
189 davinci_gpio_irq_setup();
190 return 0;
191}
192pure_initcall(davinci_gpio_setup);
193
194/*--------------------------------------------------------------------------*/
195/*
196 * We expect irqs will normally be set up as input pins, but they can also be
197 * used as output pins ... which is convenient for testing.
198 *
199 * NOTE: The first few GPIOs also have direct INTC hookups in addition
200 * to their GPIOBNK0 irq, with a bit less overhead.
201 *
202 * All those INTC hookups (direct, plus several IRQ banks) can also
203 * serve as EDMA event triggers.
204 */
205
206static void gpio_irq_disable(struct irq_data *d)
207{
208 struct davinci_gpio_regs __iomem *g = irq2regs(d->irq);
209 u32 mask = (u32) irq_data_get_irq_handler_data(d);
210
211 __raw_writel(mask, &g->clr_falling);
212 __raw_writel(mask, &g->clr_rising);
213}
214
215static void gpio_irq_enable(struct irq_data *d)
216{
217 struct davinci_gpio_regs __iomem *g = irq2regs(d->irq);
218 u32 mask = (u32) irq_data_get_irq_handler_data(d);
219 unsigned status = irqd_get_trigger_type(d);
220
221 status &= IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING;
222 if (!status)
223 status = IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING;
224
225 if (status & IRQ_TYPE_EDGE_FALLING)
226 __raw_writel(mask, &g->set_falling);
227 if (status & IRQ_TYPE_EDGE_RISING)
228 __raw_writel(mask, &g->set_rising);
229}
230
231static int gpio_irq_type(struct irq_data *d, unsigned trigger)
232{
233 if (trigger & ~(IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING))
234 return -EINVAL;
235
236 return 0;
237}
238
239static struct irq_chip gpio_irqchip = {
240 .name = "GPIO",
241 .irq_enable = gpio_irq_enable,
242 .irq_disable = gpio_irq_disable,
243 .irq_set_type = gpio_irq_type,
244 .flags = IRQCHIP_SET_TYPE_MASKED,
245};
246
247static void
248gpio_irq_handler(unsigned irq, struct irq_desc *desc)
249{
250 struct davinci_gpio_regs __iomem *g;
251 u32 mask = 0xffff;
252 struct davinci_gpio_controller *d;
253
254 d = (struct davinci_gpio_controller *)irq_desc_get_handler_data(desc);
255 g = (struct davinci_gpio_regs __iomem *)d->regs;
256
257 /* we only care about one bank */
258 if (irq & 1)
259 mask <<= 16;
260
261 /* temporarily mask (level sensitive) parent IRQ */
262 desc->irq_data.chip->irq_mask(&desc->irq_data);
263 desc->irq_data.chip->irq_ack(&desc->irq_data);
264 while (1) {
265 u32 status;
266 int n;
267 int res;
268
269 /* ack any irqs */
270 status = __raw_readl(&g->intstat) & mask;
271 if (!status)
272 break;
273 __raw_writel(status, &g->intstat);
274
275 /* now demux them to the right lowlevel handler */
276 n = d->irq_base;
277 if (irq & 1) {
278 n += 16;
279 status >>= 16;
280 }
281
282 while (status) {
283 res = ffs(status);
284 n += res;
285 generic_handle_irq(n - 1);
286 status >>= res;
287 }
288 }
289 desc->irq_data.chip->irq_unmask(&desc->irq_data);
290 /* now it may re-trigger */
291}
292
293static int gpio_to_irq_banked(struct gpio_chip *chip, unsigned offset)
294{
295 struct davinci_gpio_controller *d = chip2controller(chip);
296
297 if (d->irq_base >= 0)
298 return d->irq_base + offset;
299 else
300 return -ENODEV;
301}
302
303static int gpio_to_irq_unbanked(struct gpio_chip *chip, unsigned offset)
304{
305 struct davinci_soc_info *soc_info = &davinci_soc_info;
306
307 /* NOTE: we assume for now that only irqs in the first gpio_chip
308 * can provide direct-mapped IRQs to AINTC (up to 32 GPIOs).
309 */
310 if (offset < soc_info->gpio_unbanked)
311 return soc_info->gpio_irq + offset;
312 else
313 return -ENODEV;
314}
315
316static int gpio_irq_type_unbanked(struct irq_data *data, unsigned trigger)
317{
318 struct davinci_gpio_controller *d;
319 struct davinci_gpio_regs __iomem *g;
320 struct davinci_soc_info *soc_info = &davinci_soc_info;
321 u32 mask;
322
323 d = (struct davinci_gpio_controller *)data->handler_data;
324 g = (struct davinci_gpio_regs __iomem *)d->regs;
325 mask = __gpio_mask(data->irq - soc_info->gpio_irq);
326
327 if (trigger & ~(IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING))
328 return -EINVAL;
329
330 __raw_writel(mask, (trigger & IRQ_TYPE_EDGE_FALLING)
331 ? &g->set_falling : &g->clr_falling);
332 __raw_writel(mask, (trigger & IRQ_TYPE_EDGE_RISING)
333 ? &g->set_rising : &g->clr_rising);
334
335 return 0;
336}
337
338/*
339 * NOTE: for suspend/resume, probably best to make a platform_device with
340 * suspend_late/resume_resume calls hooking into results of the set_wake()
341 * calls ... so if no gpios are wakeup events the clock can be disabled,
342 * with outputs left at previously set levels, and so that VDD3P3V.IOPWDN0
343 * (dm6446) can be set appropriately for GPIOV33 pins.
344 */
345
346static int __init davinci_gpio_irq_setup(void)
347{
348 unsigned gpio, irq, bank;
349 struct clk *clk;
350 u32 binten = 0;
351 unsigned ngpio, bank_irq;
352 struct davinci_soc_info *soc_info = &davinci_soc_info;
353 struct davinci_gpio_regs __iomem *g;
354
355 ngpio = soc_info->gpio_num;
356
357 bank_irq = soc_info->gpio_irq;
358 if (bank_irq == 0) {
359 printk(KERN_ERR "Don't know first GPIO bank IRQ.\n");
360 return -EINVAL;
361 }
362
363 clk = clk_get(NULL, "gpio");
364 if (IS_ERR(clk)) {
365 printk(KERN_ERR "Error %ld getting gpio clock?\n",
366 PTR_ERR(clk));
367 return PTR_ERR(clk);
368 }
369 clk_enable(clk);
370
371 /* Arrange gpio_to_irq() support, handling either direct IRQs or
372 * banked IRQs. Having GPIOs in the first GPIO bank use direct
373 * IRQs, while the others use banked IRQs, would need some setup
374 * tweaks to recognize hardware which can do that.
375 */
376 for (gpio = 0, bank = 0; gpio < ngpio; bank++, gpio += 32) {
377 chips[bank].chip.to_irq = gpio_to_irq_banked;
378 chips[bank].irq_base = soc_info->gpio_unbanked
379 ? -EINVAL
380 : (soc_info->intc_irq_num + gpio);
381 }
382
383 /*
384 * AINTC can handle direct/unbanked IRQs for GPIOs, with the GPIO
385 * controller only handling trigger modes. We currently assume no
386 * IRQ mux conflicts; gpio_irq_type_unbanked() is only for GPIOs.
387 */
388 if (soc_info->gpio_unbanked) {
389 static struct irq_chip_type gpio_unbanked;
390
391 /* pass "bank 0" GPIO IRQs to AINTC */
392 chips[0].chip.to_irq = gpio_to_irq_unbanked;
393 binten = BIT(0);
394
395 /* AINTC handles mask/unmask; GPIO handles triggering */
396 irq = bank_irq;
397 gpio_unbanked = *container_of(irq_get_chip(irq),
398 struct irq_chip_type, chip);
399 gpio_unbanked.chip.name = "GPIO-AINTC";
400 gpio_unbanked.chip.irq_set_type = gpio_irq_type_unbanked;
401
402 /* default trigger: both edges */
403 g = gpio2regs(0);
404 __raw_writel(~0, &g->set_falling);
405 __raw_writel(~0, &g->set_rising);
406
407 /* set the direct IRQs up to use that irqchip */
408 for (gpio = 0; gpio < soc_info->gpio_unbanked; gpio++, irq++) {
409 irq_set_chip(irq, &gpio_unbanked.chip);
410 irq_set_handler_data(irq, &chips[gpio / 32]);
411 irq_set_status_flags(irq, IRQ_TYPE_EDGE_BOTH);
412 }
413
414 goto done;
415 }
416
417 /*
418 * Or, AINTC can handle IRQs for banks of 16 GPIO IRQs, which we
419 * then chain through our own handler.
420 */
421 for (gpio = 0, irq = gpio_to_irq(0), bank = 0;
422 gpio < ngpio;
423 bank++, bank_irq++) {
424 unsigned i;
425
426 /* disabled by default, enabled only as needed */
427 g = gpio2regs(gpio);
428 __raw_writel(~0, &g->clr_falling);
429 __raw_writel(~0, &g->clr_rising);
430
431 /* set up all irqs in this bank */
432 irq_set_chained_handler(bank_irq, gpio_irq_handler);
433
434 /*
435 * Each chip handles 32 gpios, and each irq bank consists of 16
436 * gpio irqs. Pass the irq bank's corresponding controller to
437 * the chained irq handler.
438 */
439 irq_set_handler_data(bank_irq, &chips[gpio / 32]);
440
441 for (i = 0; i < 16 && gpio < ngpio; i++, irq++, gpio++) {
442 irq_set_chip(irq, &gpio_irqchip);
443 irq_set_chip_data(irq, (__force void *)g);
444 irq_set_handler_data(irq, (void *)__gpio_mask(gpio));
445 irq_set_handler(irq, handle_simple_irq);
446 set_irq_flags(irq, IRQF_VALID);
447 }
448
449 binten |= BIT(bank);
450 }
451
452done:
453 /* BINTEN -- per-bank interrupt enable. genirq would also let these
454 * bits be set/cleared dynamically.
455 */
456 __raw_writel(binten, gpio_base + 0x08);
457
458 printk(KERN_INFO "DaVinci: %d gpio irqs\n", irq - gpio_to_irq(0));
459
460 return 0;
461}
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#include <linux/pm_runtime.h>
26
27#include <asm-generic/gpio.h>
28
29#define MAX_REGS_BANKS 5
30#define MAX_INT_PER_BANK 32
31
32struct davinci_gpio_regs {
33 u32 dir;
34 u32 out_data;
35 u32 set_data;
36 u32 clr_data;
37 u32 in_data;
38 u32 set_rising;
39 u32 clr_rising;
40 u32 set_falling;
41 u32 clr_falling;
42 u32 intstat;
43};
44
45typedef struct irq_chip *(*gpio_get_irq_chip_cb_t)(unsigned int irq);
46
47#define BINTEN 0x8 /* GPIO Interrupt Per-Bank Enable Register */
48
49static void __iomem *gpio_base;
50static unsigned int offset_array[5] = {0x10, 0x38, 0x60, 0x88, 0xb0};
51
52struct davinci_gpio_irq_data {
53 void __iomem *regs;
54 struct davinci_gpio_controller *chip;
55 int bank_num;
56};
57
58struct davinci_gpio_controller {
59 struct gpio_chip chip;
60 struct irq_domain *irq_domain;
61 /* Serialize access to GPIO registers */
62 spinlock_t lock;
63 void __iomem *regs[MAX_REGS_BANKS];
64 int gpio_unbanked;
65 int irqs[MAX_INT_PER_BANK];
66 struct davinci_gpio_regs context[MAX_REGS_BANKS];
67 u32 binten_context;
68};
69
70static inline u32 __gpio_mask(unsigned gpio)
71{
72 return 1 << (gpio % 32);
73}
74
75static inline struct davinci_gpio_regs __iomem *irq2regs(struct irq_data *d)
76{
77 struct davinci_gpio_regs __iomem *g;
78
79 g = (__force struct davinci_gpio_regs __iomem *)irq_data_get_irq_chip_data(d);
80
81 return g;
82}
83
84static int davinci_gpio_irq_setup(struct platform_device *pdev);
85
86/*--------------------------------------------------------------------------*/
87
88/* board setup code *MUST* setup pinmux and enable the GPIO clock. */
89static inline int __davinci_direction(struct gpio_chip *chip,
90 unsigned offset, bool out, int value)
91{
92 struct davinci_gpio_controller *d = gpiochip_get_data(chip);
93 struct davinci_gpio_regs __iomem *g;
94 unsigned long flags;
95 u32 temp;
96 int bank = offset / 32;
97 u32 mask = __gpio_mask(offset);
98
99 g = d->regs[bank];
100 spin_lock_irqsave(&d->lock, flags);
101 temp = readl_relaxed(&g->dir);
102 if (out) {
103 temp &= ~mask;
104 writel_relaxed(mask, value ? &g->set_data : &g->clr_data);
105 } else {
106 temp |= mask;
107 }
108 writel_relaxed(temp, &g->dir);
109 spin_unlock_irqrestore(&d->lock, flags);
110
111 return 0;
112}
113
114static int davinci_direction_in(struct gpio_chip *chip, unsigned offset)
115{
116 return __davinci_direction(chip, offset, false, 0);
117}
118
119static int
120davinci_direction_out(struct gpio_chip *chip, unsigned offset, int value)
121{
122 return __davinci_direction(chip, offset, true, value);
123}
124
125/*
126 * Read the pin's value (works even if it's set up as output);
127 * returns zero/nonzero.
128 *
129 * Note that changes are synched to the GPIO clock, so reading values back
130 * right after you've set them may give old values.
131 */
132static int davinci_gpio_get(struct gpio_chip *chip, unsigned offset)
133{
134 struct davinci_gpio_controller *d = gpiochip_get_data(chip);
135 struct davinci_gpio_regs __iomem *g;
136 int bank = offset / 32;
137
138 g = d->regs[bank];
139
140 return !!(__gpio_mask(offset) & readl_relaxed(&g->in_data));
141}
142
143/*
144 * Assuming the pin is muxed as a gpio output, set its output value.
145 */
146static void
147davinci_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
148{
149 struct davinci_gpio_controller *d = gpiochip_get_data(chip);
150 struct davinci_gpio_regs __iomem *g;
151 int bank = offset / 32;
152
153 g = d->regs[bank];
154
155 writel_relaxed(__gpio_mask(offset),
156 value ? &g->set_data : &g->clr_data);
157}
158
159static struct davinci_gpio_platform_data *
160davinci_gpio_get_pdata(struct platform_device *pdev)
161{
162 struct device_node *dn = pdev->dev.of_node;
163 struct davinci_gpio_platform_data *pdata;
164 int ret;
165 u32 val;
166
167 if (!IS_ENABLED(CONFIG_OF) || !pdev->dev.of_node)
168 return dev_get_platdata(&pdev->dev);
169
170 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
171 if (!pdata)
172 return NULL;
173
174 ret = of_property_read_u32(dn, "ti,ngpio", &val);
175 if (ret)
176 goto of_err;
177
178 pdata->ngpio = val;
179
180 ret = of_property_read_u32(dn, "ti,davinci-gpio-unbanked", &val);
181 if (ret)
182 goto of_err;
183
184 pdata->gpio_unbanked = val;
185
186 return pdata;
187
188of_err:
189 dev_err(&pdev->dev, "Populating pdata from DT failed: err %d\n", ret);
190 return NULL;
191}
192
193static int davinci_gpio_probe(struct platform_device *pdev)
194{
195 int bank, i, ret = 0;
196 unsigned int ngpio, nbank, nirq;
197 struct davinci_gpio_controller *chips;
198 struct davinci_gpio_platform_data *pdata;
199 struct device *dev = &pdev->dev;
200
201 pdata = davinci_gpio_get_pdata(pdev);
202 if (!pdata) {
203 dev_err(dev, "No platform data found\n");
204 return -EINVAL;
205 }
206
207 dev->platform_data = pdata;
208
209 /*
210 * The gpio banks conceptually expose a segmented bitmap,
211 * and "ngpio" is one more than the largest zero-based
212 * bit index that's valid.
213 */
214 ngpio = pdata->ngpio;
215 if (ngpio == 0) {
216 dev_err(dev, "How many GPIOs?\n");
217 return -EINVAL;
218 }
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 return dev_err_probe(dev, chips->irqs[i], "IRQ not populated\n");
242 }
243
244 chips->chip.label = dev_name(dev);
245
246 chips->chip.direction_input = davinci_direction_in;
247 chips->chip.get = davinci_gpio_get;
248 chips->chip.direction_output = davinci_direction_out;
249 chips->chip.set = davinci_gpio_set;
250
251 chips->chip.ngpio = ngpio;
252 chips->chip.base = pdata->no_auto_base ? pdata->base : -1;
253
254#ifdef CONFIG_OF_GPIO
255 chips->chip.of_gpio_n_cells = 2;
256 chips->chip.parent = dev;
257 chips->chip.request = gpiochip_generic_request;
258 chips->chip.free = gpiochip_generic_free;
259#endif
260 spin_lock_init(&chips->lock);
261
262 nbank = DIV_ROUND_UP(ngpio, 32);
263 for (bank = 0; bank < nbank; bank++)
264 chips->regs[bank] = gpio_base + offset_array[bank];
265
266 ret = devm_gpiochip_add_data(dev, &chips->chip, chips);
267 if (ret)
268 return ret;
269
270 platform_set_drvdata(pdev, chips);
271 ret = davinci_gpio_irq_setup(pdev);
272 if (ret)
273 return ret;
274
275 return 0;
276}
277
278/*--------------------------------------------------------------------------*/
279/*
280 * We expect irqs will normally be set up as input pins, but they can also be
281 * used as output pins ... which is convenient for testing.
282 *
283 * NOTE: The first few GPIOs also have direct INTC hookups in addition
284 * to their GPIOBNK0 irq, with a bit less overhead.
285 *
286 * All those INTC hookups (direct, plus several IRQ banks) can also
287 * serve as EDMA event triggers.
288 */
289
290static void gpio_irq_disable(struct irq_data *d)
291{
292 struct davinci_gpio_regs __iomem *g = irq2regs(d);
293 uintptr_t mask = (uintptr_t)irq_data_get_irq_handler_data(d);
294
295 writel_relaxed(mask, &g->clr_falling);
296 writel_relaxed(mask, &g->clr_rising);
297}
298
299static void gpio_irq_enable(struct irq_data *d)
300{
301 struct davinci_gpio_regs __iomem *g = irq2regs(d);
302 uintptr_t mask = (uintptr_t)irq_data_get_irq_handler_data(d);
303 unsigned status = irqd_get_trigger_type(d);
304
305 status &= IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING;
306 if (!status)
307 status = IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING;
308
309 if (status & IRQ_TYPE_EDGE_FALLING)
310 writel_relaxed(mask, &g->set_falling);
311 if (status & IRQ_TYPE_EDGE_RISING)
312 writel_relaxed(mask, &g->set_rising);
313}
314
315static int gpio_irq_type(struct irq_data *d, unsigned trigger)
316{
317 if (trigger & ~(IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING))
318 return -EINVAL;
319
320 return 0;
321}
322
323static struct irq_chip gpio_irqchip = {
324 .name = "GPIO",
325 .irq_enable = gpio_irq_enable,
326 .irq_disable = gpio_irq_disable,
327 .irq_set_type = gpio_irq_type,
328 .flags = IRQCHIP_SET_TYPE_MASKED,
329};
330
331static void gpio_irq_handler(struct irq_desc *desc)
332{
333 struct davinci_gpio_regs __iomem *g;
334 u32 mask = 0xffff;
335 int bank_num;
336 struct davinci_gpio_controller *d;
337 struct davinci_gpio_irq_data *irqdata;
338
339 irqdata = (struct davinci_gpio_irq_data *)irq_desc_get_handler_data(desc);
340 bank_num = irqdata->bank_num;
341 g = irqdata->regs;
342 d = irqdata->chip;
343
344 /* we only care about one bank */
345 if ((bank_num % 2) == 1)
346 mask <<= 16;
347
348 /* temporarily mask (level sensitive) parent IRQ */
349 chained_irq_enter(irq_desc_get_chip(desc), desc);
350 while (1) {
351 u32 status;
352 int bit;
353 irq_hw_number_t hw_irq;
354
355 /* ack any irqs */
356 status = readl_relaxed(&g->intstat) & mask;
357 if (!status)
358 break;
359 writel_relaxed(status, &g->intstat);
360
361 /* now demux them to the right lowlevel handler */
362
363 while (status) {
364 bit = __ffs(status);
365 status &= ~BIT(bit);
366 /* Max number of gpios per controller is 144 so
367 * hw_irq will be in [0..143]
368 */
369 hw_irq = (bank_num / 2) * 32 + bit;
370
371 generic_handle_domain_irq(d->irq_domain, hw_irq);
372 }
373 }
374 chained_irq_exit(irq_desc_get_chip(desc), desc);
375 /* now it may re-trigger */
376}
377
378static int gpio_to_irq_banked(struct gpio_chip *chip, unsigned offset)
379{
380 struct davinci_gpio_controller *d = gpiochip_get_data(chip);
381
382 if (d->irq_domain)
383 return irq_create_mapping(d->irq_domain, offset);
384 else
385 return -ENXIO;
386}
387
388static int gpio_to_irq_unbanked(struct gpio_chip *chip, unsigned offset)
389{
390 struct davinci_gpio_controller *d = gpiochip_get_data(chip);
391
392 /*
393 * NOTE: we assume for now that only irqs in the first gpio_chip
394 * can provide direct-mapped IRQs to AINTC (up to 32 GPIOs).
395 */
396 if (offset < d->gpio_unbanked)
397 return d->irqs[offset];
398 else
399 return -ENODEV;
400}
401
402static int gpio_irq_type_unbanked(struct irq_data *data, unsigned trigger)
403{
404 struct davinci_gpio_controller *d;
405 struct davinci_gpio_regs __iomem *g;
406 u32 mask, i;
407
408 d = (struct davinci_gpio_controller *)irq_data_get_irq_handler_data(data);
409 g = (struct davinci_gpio_regs __iomem *)d->regs[0];
410 for (i = 0; i < MAX_INT_PER_BANK; i++)
411 if (data->irq == d->irqs[i])
412 break;
413
414 if (i == MAX_INT_PER_BANK)
415 return -EINVAL;
416
417 mask = __gpio_mask(i);
418
419 if (trigger & ~(IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING))
420 return -EINVAL;
421
422 writel_relaxed(mask, (trigger & IRQ_TYPE_EDGE_FALLING)
423 ? &g->set_falling : &g->clr_falling);
424 writel_relaxed(mask, (trigger & IRQ_TYPE_EDGE_RISING)
425 ? &g->set_rising : &g->clr_rising);
426
427 return 0;
428}
429
430static int
431davinci_gpio_irq_map(struct irq_domain *d, unsigned int irq,
432 irq_hw_number_t hw)
433{
434 struct davinci_gpio_controller *chips =
435 (struct davinci_gpio_controller *)d->host_data;
436 struct davinci_gpio_regs __iomem *g = chips->regs[hw / 32];
437
438 irq_set_chip_and_handler_name(irq, &gpio_irqchip, handle_simple_irq,
439 "davinci_gpio");
440 irq_set_irq_type(irq, IRQ_TYPE_NONE);
441 irq_set_chip_data(irq, (__force void *)g);
442 irq_set_handler_data(irq, (void *)(uintptr_t)__gpio_mask(hw));
443
444 return 0;
445}
446
447static const struct irq_domain_ops davinci_gpio_irq_ops = {
448 .map = davinci_gpio_irq_map,
449 .xlate = irq_domain_xlate_onetwocell,
450};
451
452static struct irq_chip *davinci_gpio_get_irq_chip(unsigned int irq)
453{
454 static struct irq_chip_type gpio_unbanked;
455
456 gpio_unbanked = *irq_data_get_chip_type(irq_get_irq_data(irq));
457
458 return &gpio_unbanked.chip;
459};
460
461static struct irq_chip *keystone_gpio_get_irq_chip(unsigned int irq)
462{
463 static struct irq_chip gpio_unbanked;
464
465 gpio_unbanked = *irq_get_chip(irq);
466 return &gpio_unbanked;
467};
468
469static const struct of_device_id davinci_gpio_ids[];
470
471/*
472 * NOTE: for suspend/resume, probably best to make a platform_device with
473 * suspend_late/resume_resume calls hooking into results of the set_wake()
474 * calls ... so if no gpios are wakeup events the clock can be disabled,
475 * with outputs left at previously set levels, and so that VDD3P3V.IOPWDN0
476 * (dm6446) can be set appropriately for GPIOV33 pins.
477 */
478
479static int davinci_gpio_irq_setup(struct platform_device *pdev)
480{
481 unsigned gpio, bank;
482 int irq;
483 int ret;
484 struct clk *clk;
485 u32 binten = 0;
486 unsigned ngpio;
487 struct device *dev = &pdev->dev;
488 struct davinci_gpio_controller *chips = platform_get_drvdata(pdev);
489 struct davinci_gpio_platform_data *pdata = dev->platform_data;
490 struct davinci_gpio_regs __iomem *g;
491 struct irq_domain *irq_domain = NULL;
492 const struct of_device_id *match;
493 struct irq_chip *irq_chip;
494 struct davinci_gpio_irq_data *irqdata;
495 gpio_get_irq_chip_cb_t gpio_get_irq_chip;
496
497 /*
498 * Use davinci_gpio_get_irq_chip by default to handle non DT cases
499 */
500 gpio_get_irq_chip = davinci_gpio_get_irq_chip;
501 match = of_match_device(of_match_ptr(davinci_gpio_ids),
502 dev);
503 if (match)
504 gpio_get_irq_chip = (gpio_get_irq_chip_cb_t)match->data;
505
506 ngpio = pdata->ngpio;
507
508 clk = devm_clk_get(dev, "gpio");
509 if (IS_ERR(clk)) {
510 dev_err(dev, "Error %ld getting gpio clock\n", PTR_ERR(clk));
511 return PTR_ERR(clk);
512 }
513
514 ret = clk_prepare_enable(clk);
515 if (ret)
516 return ret;
517
518 if (!pdata->gpio_unbanked) {
519 irq = devm_irq_alloc_descs(dev, -1, 0, ngpio, 0);
520 if (irq < 0) {
521 dev_err(dev, "Couldn't allocate IRQ numbers\n");
522 clk_disable_unprepare(clk);
523 return irq;
524 }
525
526 irq_domain = irq_domain_add_legacy(dev->of_node, ngpio, irq, 0,
527 &davinci_gpio_irq_ops,
528 chips);
529 if (!irq_domain) {
530 dev_err(dev, "Couldn't register an IRQ domain\n");
531 clk_disable_unprepare(clk);
532 return -ENODEV;
533 }
534 }
535
536 /*
537 * Arrange gpio_to_irq() support, handling either direct IRQs or
538 * banked IRQs. Having GPIOs in the first GPIO bank use direct
539 * IRQs, while the others use banked IRQs, would need some setup
540 * tweaks to recognize hardware which can do that.
541 */
542 chips->chip.to_irq = gpio_to_irq_banked;
543 chips->irq_domain = irq_domain;
544
545 /*
546 * AINTC can handle direct/unbanked IRQs for GPIOs, with the GPIO
547 * controller only handling trigger modes. We currently assume no
548 * IRQ mux conflicts; gpio_irq_type_unbanked() is only for GPIOs.
549 */
550 if (pdata->gpio_unbanked) {
551 /* pass "bank 0" GPIO IRQs to AINTC */
552 chips->chip.to_irq = gpio_to_irq_unbanked;
553 chips->gpio_unbanked = pdata->gpio_unbanked;
554 binten = GENMASK(pdata->gpio_unbanked / 16, 0);
555
556 /* AINTC handles mask/unmask; GPIO handles triggering */
557 irq = chips->irqs[0];
558 irq_chip = gpio_get_irq_chip(irq);
559 irq_chip->name = "GPIO-AINTC";
560 irq_chip->irq_set_type = gpio_irq_type_unbanked;
561
562 /* default trigger: both edges */
563 g = chips->regs[0];
564 writel_relaxed(~0, &g->set_falling);
565 writel_relaxed(~0, &g->set_rising);
566
567 /* set the direct IRQs up to use that irqchip */
568 for (gpio = 0; gpio < pdata->gpio_unbanked; gpio++) {
569 irq_set_chip(chips->irqs[gpio], irq_chip);
570 irq_set_handler_data(chips->irqs[gpio], chips);
571 irq_set_status_flags(chips->irqs[gpio],
572 IRQ_TYPE_EDGE_BOTH);
573 }
574
575 goto done;
576 }
577
578 /*
579 * Or, AINTC can handle IRQs for banks of 16 GPIO IRQs, which we
580 * then chain through our own handler.
581 */
582 for (gpio = 0, bank = 0; gpio < ngpio; bank++, gpio += 16) {
583 /* disabled by default, enabled only as needed
584 * There are register sets for 32 GPIOs. 2 banks of 16
585 * GPIOs are covered by each set of registers hence divide by 2
586 */
587 g = chips->regs[bank / 2];
588 writel_relaxed(~0, &g->clr_falling);
589 writel_relaxed(~0, &g->clr_rising);
590
591 /*
592 * Each chip handles 32 gpios, and each irq bank consists of 16
593 * gpio irqs. Pass the irq bank's corresponding controller to
594 * the chained irq handler.
595 */
596 irqdata = devm_kzalloc(&pdev->dev,
597 sizeof(struct
598 davinci_gpio_irq_data),
599 GFP_KERNEL);
600 if (!irqdata) {
601 clk_disable_unprepare(clk);
602 return -ENOMEM;
603 }
604
605 irqdata->regs = g;
606 irqdata->bank_num = bank;
607 irqdata->chip = chips;
608
609 irq_set_chained_handler_and_data(chips->irqs[bank],
610 gpio_irq_handler, irqdata);
611
612 binten |= BIT(bank);
613 }
614
615done:
616 /*
617 * BINTEN -- per-bank interrupt enable. genirq would also let these
618 * bits be set/cleared dynamically.
619 */
620 writel_relaxed(binten, gpio_base + BINTEN);
621
622 return 0;
623}
624
625static void davinci_gpio_save_context(struct davinci_gpio_controller *chips,
626 u32 nbank)
627{
628 struct davinci_gpio_regs __iomem *g;
629 struct davinci_gpio_regs *context;
630 u32 bank;
631 void __iomem *base;
632
633 base = chips->regs[0] - offset_array[0];
634 chips->binten_context = readl_relaxed(base + BINTEN);
635
636 for (bank = 0; bank < nbank; bank++) {
637 g = chips->regs[bank];
638 context = &chips->context[bank];
639 context->dir = readl_relaxed(&g->dir);
640 context->set_data = readl_relaxed(&g->set_data);
641 context->set_rising = readl_relaxed(&g->set_rising);
642 context->set_falling = readl_relaxed(&g->set_falling);
643 }
644
645 /* Clear Bank interrupt enable bit */
646 writel_relaxed(0, base + BINTEN);
647
648 /* Clear all interrupt status registers */
649 writel_relaxed(GENMASK(31, 0), &g->intstat);
650}
651
652static void davinci_gpio_restore_context(struct davinci_gpio_controller *chips,
653 u32 nbank)
654{
655 struct davinci_gpio_regs __iomem *g;
656 struct davinci_gpio_regs *context;
657 u32 bank;
658 void __iomem *base;
659
660 base = chips->regs[0] - offset_array[0];
661
662 if (readl_relaxed(base + BINTEN) != chips->binten_context)
663 writel_relaxed(chips->binten_context, base + BINTEN);
664
665 for (bank = 0; bank < nbank; bank++) {
666 g = chips->regs[bank];
667 context = &chips->context[bank];
668 if (readl_relaxed(&g->dir) != context->dir)
669 writel_relaxed(context->dir, &g->dir);
670 if (readl_relaxed(&g->set_data) != context->set_data)
671 writel_relaxed(context->set_data, &g->set_data);
672 if (readl_relaxed(&g->set_rising) != context->set_rising)
673 writel_relaxed(context->set_rising, &g->set_rising);
674 if (readl_relaxed(&g->set_falling) != context->set_falling)
675 writel_relaxed(context->set_falling, &g->set_falling);
676 }
677}
678
679static int davinci_gpio_suspend(struct device *dev)
680{
681 struct davinci_gpio_controller *chips = dev_get_drvdata(dev);
682 struct davinci_gpio_platform_data *pdata = dev_get_platdata(dev);
683 u32 nbank = DIV_ROUND_UP(pdata->ngpio, 32);
684
685 davinci_gpio_save_context(chips, nbank);
686
687 return 0;
688}
689
690static int davinci_gpio_resume(struct device *dev)
691{
692 struct davinci_gpio_controller *chips = dev_get_drvdata(dev);
693 struct davinci_gpio_platform_data *pdata = dev_get_platdata(dev);
694 u32 nbank = DIV_ROUND_UP(pdata->ngpio, 32);
695
696 davinci_gpio_restore_context(chips, nbank);
697
698 return 0;
699}
700
701DEFINE_SIMPLE_DEV_PM_OPS(davinci_gpio_dev_pm_ops, davinci_gpio_suspend,
702 davinci_gpio_resume);
703
704static const struct of_device_id davinci_gpio_ids[] = {
705 { .compatible = "ti,keystone-gpio", keystone_gpio_get_irq_chip},
706 { .compatible = "ti,am654-gpio", keystone_gpio_get_irq_chip},
707 { .compatible = "ti,dm6441-gpio", davinci_gpio_get_irq_chip},
708 { /* sentinel */ },
709};
710MODULE_DEVICE_TABLE(of, davinci_gpio_ids);
711
712static struct platform_driver davinci_gpio_driver = {
713 .probe = davinci_gpio_probe,
714 .driver = {
715 .name = "davinci_gpio",
716 .pm = pm_sleep_ptr(&davinci_gpio_dev_pm_ops),
717 .of_match_table = of_match_ptr(davinci_gpio_ids),
718 },
719};
720
721/**
722 * GPIO driver registration needs to be done before machine_init functions
723 * access GPIO. Hence davinci_gpio_drv_reg() is a postcore_initcall.
724 */
725static int __init davinci_gpio_drv_reg(void)
726{
727 return platform_driver_register(&davinci_gpio_driver);
728}
729postcore_initcall(davinci_gpio_drv_reg);
730
731static void __exit davinci_gpio_exit(void)
732{
733 platform_driver_unregister(&davinci_gpio_driver);
734}
735module_exit(davinci_gpio_exit);
736
737MODULE_AUTHOR("Jan Kotas <jank@cadence.com>");
738MODULE_DESCRIPTION("DAVINCI GPIO driver");
739MODULE_LICENSE("GPL");
740MODULE_ALIAS("platform:gpio-davinci");