]> git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blame - drivers/pinctrl/spear/pinctrl-plgpio.c
projects / mirror_ubuntu-bionic-kernel.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
pinctrl/gpio: Unify namespace for cross-calls
[mirror_ubuntu-bionic-kernel.git] / drivers / pinctrl / spear / pinctrl-plgpio.c
CommitLineData
604bb7da
VK		 1/*
2 * SPEAr platform PLGPIO driver
3 *
4 * Copyright (C) 2012 ST Microelectronics
5 * Viresh Kumar <viresh.kumar@linaro.org>
6 *
7 * This file is licensed under the terms of the GNU General Public
8 * License version 2. This program is licensed "as is" without any
9 * warranty of any kind, whether express or implied.
10 */
11
12#include <linux/clk.h>
13#include <linux/err.h>
22763bf5 14#include <linux/gpio/driver.h>
604bb7da 15#include <linux/io.h>
8429cba1 16#include <linux/init.h>
22763bf5
LW		 17#include <linux/of.h>
18#include <linux/of_platform.h>
604bb7da
VK		 19#include <linux/pinctrl/consumer.h>
20#include <linux/platform_device.h>
21#include <linux/pm.h>
22#include <linux/spinlock.h>
604bb7da
VK		 23
24#define MAX_GPIO_PER_REG 32
25#define PIN_OFFSET(pin) (pin % MAX_GPIO_PER_REG)
26#define REG_OFFSET(base, reg, pin) (base + reg + (pin / MAX_GPIO_PER_REG) \
27 * sizeof(int *))
28
29/*
30 * plgpio pins in all machines are not one to one mapped, bitwise with registers
31 * bits. These set of macros define register masks for which below functions
32 * (pin_to_offset and offset_to_pin) are required to be called.
33 */
34#define PTO_ENB_REG 0x001
35#define PTO_WDATA_REG 0x002
36#define PTO_DIR_REG 0x004
37#define PTO_IE_REG 0x008
38#define PTO_RDATA_REG 0x010
39#define PTO_MIS_REG 0x020
40
41struct plgpio_regs {
42 u32 enb; /* enable register */
43 u32 wdata; /* write data register */
44 u32 dir; /* direction set register */
45 u32 rdata; /* read data register */
46 u32 ie; /* interrupt enable register */
47 u32 mis; /* mask interrupt status register */
48 u32 eit; /* edge interrupt type */
49};
50
51/*
52 * struct plgpio: plgpio driver specific structure
53 *
54 * lock: lock for guarding gpio registers
55 * base: base address of plgpio block
604bb7da
VK		 56 * chip: gpio framework specific chip information structure
57 * p2o: function ptr for pin to offset conversion. This is required only for
58 * machines where mapping b/w pin and offset is not 1-to-1.
59 * o2p: function ptr for offset to pin conversion. This is required only for
60 * machines where mapping b/w pin and offset is not 1-to-1.
61 * p2o_regs: mask of registers for which p2o and o2p are applicable
62 * regs: register offsets
63 * csave_regs: context save registers for standby/sleep/hibernate cases
64 */
65struct plgpio {
66 spinlock_t lock;
67 void __iomem *base;
68 struct clk *clk;
604bb7da
VK		 69 struct gpio_chip chip;
70 int (*p2o)(int pin); /* pin_to_offset */
71 int (*o2p)(int offset); /* offset_to_pin */
72 u32 p2o_regs;
73 struct plgpio_regs regs;
37e49014 74#ifdef CONFIG_PM_SLEEP
604bb7da
VK		 75 struct plgpio_regs *csave_regs;
76#endif
77};
78
79/* register manipulation inline functions */
80static inline u32 is_plgpio_set(void __iomem *base, u32 pin, u32 reg)
81{
82 u32 offset = PIN_OFFSET(pin);
83 void __iomem *reg_off = REG_OFFSET(base, reg, pin);
84 u32 val = readl_relaxed(reg_off);
85
86 return !!(val & (1 << offset));
87}
88
89static inline void plgpio_reg_set(void __iomem *base, u32 pin, u32 reg)
90{
91 u32 offset = PIN_OFFSET(pin);
92 void __iomem *reg_off = REG_OFFSET(base, reg, pin);
93 u32 val = readl_relaxed(reg_off);
94
95 writel_relaxed(val | (1 << offset), reg_off);
96}
97
98static inline void plgpio_reg_reset(void __iomem *base, u32 pin, u32 reg)
99{
100 u32 offset = PIN_OFFSET(pin);
101 void __iomem *reg_off = REG_OFFSET(base, reg, pin);
102 u32 val = readl_relaxed(reg_off);
103
104 writel_relaxed(val & ~(1 << offset), reg_off);
105}
106
107/* gpio framework specific routines */
108static int plgpio_direction_input(struct gpio_chip *chip, unsigned offset)
109{
cff4c7ef 110 struct plgpio *plgpio = gpiochip_get_data(chip);
604bb7da
VK		 111 unsigned long flags;
112
113 /* get correct offset for "offset" pin */
114 if (plgpio->p2o && (plgpio->p2o_regs & PTO_DIR_REG)) {
115 offset = plgpio->p2o(offset);
116 if (offset == -1)
117 return -EINVAL;
118 }
119
120 spin_lock_irqsave(&plgpio->lock, flags);
121 plgpio_reg_set(plgpio->base, offset, plgpio->regs.dir);
122 spin_unlock_irqrestore(&plgpio->lock, flags);
123
124 return 0;
125}
126
127static int plgpio_direction_output(struct gpio_chip *chip, unsigned offset,
128 int value)
129{
cff4c7ef 130 struct plgpio *plgpio = gpiochip_get_data(chip);
604bb7da
VK		 131 unsigned long flags;
132 unsigned dir_offset = offset, wdata_offset = offset, tmp;
133
134 /* get correct offset for "offset" pin */
135 if (plgpio->p2o && (plgpio->p2o_regs & (PTO_DIR_REG | PTO_WDATA_REG))) {
136 tmp = plgpio->p2o(offset);
137 if (tmp == -1)
138 return -EINVAL;
139
140 if (plgpio->p2o_regs & PTO_DIR_REG)
141 dir_offset = tmp;
142 if (plgpio->p2o_regs & PTO_WDATA_REG)
143 wdata_offset = tmp;
144 }
145
146 spin_lock_irqsave(&plgpio->lock, flags);
147 if (value)
148 plgpio_reg_set(plgpio->base, wdata_offset,
149 plgpio->regs.wdata);
150 else
151 plgpio_reg_reset(plgpio->base, wdata_offset,
152 plgpio->regs.wdata);
153
154 plgpio_reg_reset(plgpio->base, dir_offset, plgpio->regs.dir);
155 spin_unlock_irqrestore(&plgpio->lock, flags);
156
157 return 0;
158}
159
160static int plgpio_get_value(struct gpio_chip *chip, unsigned offset)
161{
cff4c7ef 162 struct plgpio *plgpio = gpiochip_get_data(chip);
604bb7da
VK		 163
164 if (offset >= chip->ngpio)
165 return -EINVAL;
166
167 /* get correct offset for "offset" pin */
168 if (plgpio->p2o && (plgpio->p2o_regs & PTO_RDATA_REG)) {
169 offset = plgpio->p2o(offset);
170 if (offset == -1)
171 return -EINVAL;
172 }
173
174 return is_plgpio_set(plgpio->base, offset, plgpio->regs.rdata);
175}
176
177static void plgpio_set_value(struct gpio_chip *chip, unsigned offset, int value)
178{
cff4c7ef 179 struct plgpio *plgpio = gpiochip_get_data(chip);
604bb7da
VK		 180
181 if (offset >= chip->ngpio)
182 return;
183
184 /* get correct offset for "offset" pin */
185 if (plgpio->p2o && (plgpio->p2o_regs & PTO_WDATA_REG)) {
186 offset = plgpio->p2o(offset);
187 if (offset == -1)
188 return;
189 }
190
191 if (value)
192 plgpio_reg_set(plgpio->base, offset, plgpio->regs.wdata);
193 else
194 plgpio_reg_reset(plgpio->base, offset, plgpio->regs.wdata);
195}
196
197static int plgpio_request(struct gpio_chip *chip, unsigned offset)
198{
cff4c7ef 199 struct plgpio *plgpio = gpiochip_get_data(chip);
604bb7da
VK		 200 int gpio = chip->base + offset;
201 unsigned long flags;
202 int ret = 0;
203
204 if (offset >= chip->ngpio)
205 return -EINVAL;
206
a9a1d2a7 207 ret = pinctrl_gpio_request(gpio);
604bb7da
VK		 208 if (ret)
209 return ret;
210
211 if (!IS_ERR(plgpio->clk)) {
f92bc45f 212 ret = clk_enable(plgpio->clk);
604bb7da
VK		 213 if (ret)
214 goto err0;
215 }
216
217 if (plgpio->regs.enb == -1)
218 return 0;
219
220 /*
221 * put gpio in IN mode before enabling it. This make enabling gpio safe
222 */
223 ret = plgpio_direction_input(chip, offset);
224 if (ret)
225 goto err1;
226
227 /* get correct offset for "offset" pin */
228 if (plgpio->p2o && (plgpio->p2o_regs & PTO_ENB_REG)) {
229 offset = plgpio->p2o(offset);
230 if (offset == -1) {
231 ret = -EINVAL;
232 goto err1;
233 }
234 }
235
236 spin_lock_irqsave(&plgpio->lock, flags);
237 plgpio_reg_set(plgpio->base, offset, plgpio->regs.enb);
238 spin_unlock_irqrestore(&plgpio->lock, flags);
239 return 0;
240
241err1:
98040490 242 if (!IS_ERR(plgpio->clk))
f92bc45f 243 clk_disable(plgpio->clk);
604bb7da 244err0:
a9a1d2a7 245 pinctrl_gpio_free(gpio);
604bb7da
VK		 246 return ret;
247}
248
249static void plgpio_free(struct gpio_chip *chip, unsigned offset)
250{
cff4c7ef 251 struct plgpio *plgpio = gpiochip_get_data(chip);
604bb7da
VK		 252 int gpio = chip->base + offset;
253 unsigned long flags;
254
255 if (offset >= chip->ngpio)
256 return;
257
258 if (plgpio->regs.enb == -1)
259 goto disable_clk;
260
261 /* get correct offset for "offset" pin */
262 if (plgpio->p2o && (plgpio->p2o_regs & PTO_ENB_REG)) {
263 offset = plgpio->p2o(offset);
264 if (offset == -1)
265 return;
266 }
267
268 spin_lock_irqsave(&plgpio->lock, flags);
269 plgpio_reg_reset(plgpio->base, offset, plgpio->regs.enb);
270 spin_unlock_irqrestore(&plgpio->lock, flags);
271
272disable_clk:
273 if (!IS_ERR(plgpio->clk))
f92bc45f 274 clk_disable(plgpio->clk);
604bb7da 275
a9a1d2a7 276 pinctrl_gpio_free(gpio);
604bb7da
VK		 277}
278
604bb7da
VK		 279/* PLGPIO IRQ */
280static void plgpio_irq_disable(struct irq_data *d)
281{
22763bf5 282 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
cff4c7ef 283 struct plgpio *plgpio = gpiochip_get_data(gc);
22763bf5 284 int offset = d->hwirq;
604bb7da
VK		 285 unsigned long flags;
286
287 /* get correct offset for "offset" pin */
288 if (plgpio->p2o && (plgpio->p2o_regs & PTO_IE_REG)) {
289 offset = plgpio->p2o(offset);
290 if (offset == -1)
291 return;
292 }
293
294 spin_lock_irqsave(&plgpio->lock, flags);
295 plgpio_reg_set(plgpio->base, offset, plgpio->regs.ie);
296 spin_unlock_irqrestore(&plgpio->lock, flags);
297}
298
299static void plgpio_irq_enable(struct irq_data *d)
300{
22763bf5 301 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
cff4c7ef 302 struct plgpio *plgpio = gpiochip_get_data(gc);
22763bf5 303 int offset = d->hwirq;
604bb7da
VK		 304 unsigned long flags;
305
306 /* get correct offset for "offset" pin */
307 if (plgpio->p2o && (plgpio->p2o_regs & PTO_IE_REG)) {
308 offset = plgpio->p2o(offset);
309 if (offset == -1)
310 return;
311 }
312
313 spin_lock_irqsave(&plgpio->lock, flags);
314 plgpio_reg_reset(plgpio->base, offset, plgpio->regs.ie);
315 spin_unlock_irqrestore(&plgpio->lock, flags);
316}
317
318static int plgpio_irq_set_type(struct irq_data *d, unsigned trigger)
319{
22763bf5 320 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
cff4c7ef 321 struct plgpio *plgpio = gpiochip_get_data(gc);
22763bf5 322 int offset = d->hwirq;
604bb7da
VK		 323 void __iomem *reg_off;
324 unsigned int supported_type = 0, val;
325
326 if (offset >= plgpio->chip.ngpio)
327 return -EINVAL;
328
329 if (plgpio->regs.eit == -1)
330 supported_type = IRQ_TYPE_LEVEL_HIGH;
331 else
332 supported_type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING;
333
334 if (!(trigger & supported_type))
335 return -EINVAL;
336
337 if (plgpio->regs.eit == -1)
338 return 0;
339
340 reg_off = REG_OFFSET(plgpio->base, plgpio->regs.eit, offset);
341 val = readl_relaxed(reg_off);
342
343 offset = PIN_OFFSET(offset);
344 if (trigger & IRQ_TYPE_EDGE_RISING)
345 writel_relaxed(val | (1 << offset), reg_off);
346 else
347 writel_relaxed(val & ~(1 << offset), reg_off);
348
349 return 0;
350}
351
352static struct irq_chip plgpio_irqchip = {
353 .name = "PLGPIO",
354 .irq_enable = plgpio_irq_enable,
355 .irq_disable = plgpio_irq_disable,
356 .irq_set_type = plgpio_irq_set_type,
357};
358
bd0b9ac4 359static void plgpio_irq_handler(struct irq_desc *desc)
604bb7da 360{
22763bf5 361 struct gpio_chip *gc = irq_desc_get_handler_data(desc);
cff4c7ef 362 struct plgpio *plgpio = gpiochip_get_data(gc);
604bb7da
VK		 363 struct irq_chip *irqchip = irq_desc_get_chip(desc);
364 int regs_count, count, pin, offset, i = 0;
365 unsigned long pending;
366
367 count = plgpio->chip.ngpio;
368 regs_count = DIV_ROUND_UP(count, MAX_GPIO_PER_REG);
369
370 chained_irq_enter(irqchip, desc);
371 /* check all plgpio MIS registers for a possible interrupt */
372 for (; i < regs_count; i++) {
373 pending = readl_relaxed(plgpio->base + plgpio->regs.mis +
374 i * sizeof(int *));
375 if (!pending)
376 continue;
377
378 /* clear interrupts */
379 writel_relaxed(~pending, plgpio->base + plgpio->regs.mis +
380 i * sizeof(int *));
381 /*
382 * clear extra bits in last register having gpios < MAX/REG
383 * ex: Suppose there are max 102 plgpios. then last register
384 * must have only (102 - MAX_GPIO_PER_REG * 3) = 6 relevant bits
385 * so, we must not take other 28 bits into consideration for
386 * checking interrupt. so clear those bits.
387 */
388 count = count - i * MAX_GPIO_PER_REG;
389 if (count < MAX_GPIO_PER_REG)
390 pending &= (1 << count) - 1;
391
392 for_each_set_bit(offset, &pending, MAX_GPIO_PER_REG) {
393 /* get correct pin for "offset" */
394 if (plgpio->o2p && (plgpio->p2o_regs & PTO_MIS_REG)) {
395 pin = plgpio->o2p(offset);
396 if (pin == -1)
397 continue;
398 } else
399 pin = offset;
400
401 /* get correct irq line number */
402 pin = i * MAX_GPIO_PER_REG + pin;
22763bf5
LW		 403 generic_handle_irq(
404 irq_find_mapping(gc->irqdomain, pin));
604bb7da
VK		 405 }
406 }
407 chained_irq_exit(irqchip, desc);
408}
409
410/*
411 * pin to offset and offset to pin converter functions
412 *
413 * In spear310 there is inconsistency among bit positions in plgpio regiseters,
414 * for different plgpio pins. For example: for pin 27, bit offset is 23, pin
415 * 28-33 are not supported, pin 95 has offset bit 95, bit 100 has offset bit 1
416 */
417static int spear310_p2o(int pin)
418{
419 int offset = pin;
420
421 if (pin <= 27)
422 offset += 4;
423 else if (pin <= 33)
424 offset = -1;
425 else if (pin <= 97)
426 offset -= 2;
427 else if (pin <= 101)
428 offset = 101 - pin;
429 else
430 offset = -1;
431
432 return offset;
433}
434
a59f0e21 435static int spear310_o2p(int offset)
604bb7da
VK		 436{
437 if (offset <= 3)
438 return 101 - offset;
439 else if (offset <= 31)
440 return offset - 4;
441 else
442 return offset + 2;
443}
444
150632b0 445static int plgpio_probe_dt(struct platform_device *pdev, struct plgpio *plgpio)
604bb7da
VK		 446{
447 struct device_node *np = pdev->dev.of_node;
448 int ret = -EINVAL;
449 u32 val;
450
451 if (of_machine_is_compatible("st,spear310")) {
452 plgpio->p2o = spear310_p2o;
453 plgpio->o2p = spear310_o2p;
454 plgpio->p2o_regs = PTO_WDATA_REG | PTO_DIR_REG | PTO_IE_REG |
455 PTO_RDATA_REG | PTO_MIS_REG;
456 }
457
458 if (!of_property_read_u32(np, "st-plgpio,ngpio", &val)) {
459 plgpio->chip.ngpio = val;
460 } else {
461 dev_err(&pdev->dev, "DT: Invalid ngpio field\n");
462 goto end;
463 }
464
465 if (!of_property_read_u32(np, "st-plgpio,enb-reg", &val))
466 plgpio->regs.enb = val;
467 else
468 plgpio->regs.enb = -1;
469
470 if (!of_property_read_u32(np, "st-plgpio,wdata-reg", &val)) {
471 plgpio->regs.wdata = val;
472 } else {
473 dev_err(&pdev->dev, "DT: Invalid wdata reg\n");
474 goto end;
475 }
476
477 if (!of_property_read_u32(np, "st-plgpio,dir-reg", &val)) {
478 plgpio->regs.dir = val;
479 } else {
480 dev_err(&pdev->dev, "DT: Invalid dir reg\n");
481 goto end;
482 }
483
484 if (!of_property_read_u32(np, "st-plgpio,ie-reg", &val)) {
485 plgpio->regs.ie = val;
486 } else {
487 dev_err(&pdev->dev, "DT: Invalid ie reg\n");
488 goto end;
489 }
490
491 if (!of_property_read_u32(np, "st-plgpio,rdata-reg", &val)) {
492 plgpio->regs.rdata = val;
493 } else {
494 dev_err(&pdev->dev, "DT: Invalid rdata reg\n");
495 goto end;
496 }
497
498 if (!of_property_read_u32(np, "st-plgpio,mis-reg", &val)) {
499 plgpio->regs.mis = val;
500 } else {
501 dev_err(&pdev->dev, "DT: Invalid mis reg\n");
502 goto end;
503 }
504
505 if (!of_property_read_u32(np, "st-plgpio,eit-reg", &val))
506 plgpio->regs.eit = val;
507 else
508 plgpio->regs.eit = -1;
509
510 return 0;
511
512end:
513 return ret;
514}
150632b0 515static int plgpio_probe(struct platform_device *pdev)
604bb7da 516{
604bb7da
VK		 517 struct plgpio *plgpio;
518 struct resource *res;
22763bf5 519 int ret, irq;
604bb7da 520
604bb7da
VK		 521 plgpio = devm_kzalloc(&pdev->dev, sizeof(*plgpio), GFP_KERNEL);
522 if (!plgpio) {
523 dev_err(&pdev->dev, "memory allocation fail\n");
524 return -ENOMEM;
525 }
526
8ec136d0 527 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
9e0c1fb2
TR		 528 plgpio->base = devm_ioremap_resource(&pdev->dev, res);
529 if (IS_ERR(plgpio->base))
530 return PTR_ERR(plgpio->base);
604bb7da
VK		 531
532 ret = plgpio_probe_dt(pdev, plgpio);
533 if (ret) {
534 dev_err(&pdev->dev, "DT probe failed\n");
535 return ret;
536 }
537
538 plgpio->clk = devm_clk_get(&pdev->dev, NULL);
539 if (IS_ERR(plgpio->clk))
540 dev_warn(&pdev->dev, "clk_get() failed, work without it\n");
541
37e49014 542#ifdef CONFIG_PM_SLEEP
604bb7da
VK		 543 plgpio->csave_regs = devm_kzalloc(&pdev->dev,
544 sizeof(*plgpio->csave_regs) *
545 DIV_ROUND_UP(plgpio->chip.ngpio, MAX_GPIO_PER_REG),
546 GFP_KERNEL);
547 if (!plgpio->csave_regs) {
548 dev_err(&pdev->dev, "csave registers memory allocation fail\n");
549 return -ENOMEM;
550 }
551#endif
552
553 platform_set_drvdata(pdev, plgpio);
554 spin_lock_init(&plgpio->lock);
555
604bb7da
VK		 556 plgpio->chip.base = -1;
557 plgpio->chip.request = plgpio_request;
558 plgpio->chip.free = plgpio_free;
559 plgpio->chip.direction_input = plgpio_direction_input;
560 plgpio->chip.direction_output = plgpio_direction_output;
561 plgpio->chip.get = plgpio_get_value;
562 plgpio->chip.set = plgpio_set_value;
604bb7da 563 plgpio->chip.label = dev_name(&pdev->dev);
58383c78 564 plgpio->chip.parent = &pdev->dev;
604bb7da 565 plgpio->chip.owner = THIS_MODULE;
22763bf5 566 plgpio->chip.of_node = pdev->dev.of_node;
604bb7da 567
f92bc45f
VK		 568 if (!IS_ERR(plgpio->clk)) {
569 ret = clk_prepare(plgpio->clk);
570 if (ret) {
571 dev_err(&pdev->dev, "clk prepare failed\n");
572 return ret;
573 }
574 }
575
cff4c7ef 576 ret = gpiochip_add_data(&plgpio->chip, plgpio);
604bb7da
VK		 577 if (ret) {
578 dev_err(&pdev->dev, "unable to add gpio chip\n");
f92bc45f 579 goto unprepare_clk;
604bb7da
VK		 580 }
581
582 irq = platform_get_irq(pdev, 0);
583 if (irq < 0) {
22763bf5 584 dev_info(&pdev->dev, "PLGPIO registered without IRQs\n");
604bb7da
VK		 585 return 0;
586 }
587
22763bf5
LW		 588 ret = gpiochip_irqchip_add(&plgpio->chip,
589 &plgpio_irqchip,
590 0,
591 handle_simple_irq,
592 IRQ_TYPE_NONE);
593 if (ret) {
594 dev_err(&pdev->dev, "failed to add irqchip to gpiochip\n");
604bb7da
VK		 595 goto remove_gpiochip;
596 }
597
22763bf5
LW		 598 gpiochip_set_chained_irqchip(&plgpio->chip,
599 &plgpio_irqchip,
600 irq,
601 plgpio_irq_handler);
604bb7da 602
604bb7da
VK		 603 dev_info(&pdev->dev, "PLGPIO registered with IRQs\n");
604
605 return 0;
606
607remove_gpiochip:
608 dev_info(&pdev->dev, "Remove gpiochip\n");
b4e7c55d 609 gpiochip_remove(&plgpio->chip);
f92bc45f
VK		 610unprepare_clk:
611 if (!IS_ERR(plgpio->clk))
612 clk_unprepare(plgpio->clk);
604bb7da
VK		 613
614 return ret;
615}
616
37e49014 617#ifdef CONFIG_PM_SLEEP
604bb7da
VK		 618static int plgpio_suspend(struct device *dev)
619{
620 struct plgpio *plgpio = dev_get_drvdata(dev);
621 int i, reg_count = DIV_ROUND_UP(plgpio->chip.ngpio, MAX_GPIO_PER_REG);
622 void __iomem *off;
623
624 for (i = 0; i < reg_count; i++) {
625 off = plgpio->base + i * sizeof(int *);
626
627 if (plgpio->regs.enb != -1)
628 plgpio->csave_regs[i].enb =
629 readl_relaxed(plgpio->regs.enb + off);
630 if (plgpio->regs.eit != -1)
631 plgpio->csave_regs[i].eit =
632 readl_relaxed(plgpio->regs.eit + off);
633 plgpio->csave_regs[i].wdata = readl_relaxed(plgpio->regs.wdata +
634 off);
635 plgpio->csave_regs[i].dir = readl_relaxed(plgpio->regs.dir +
636 off);
637 plgpio->csave_regs[i].ie = readl_relaxed(plgpio->regs.ie + off);
638 }
639
640 return 0;
641}
642
643/*
644 * This is used to correct the values in end registers. End registers contain
645 * extra bits that might be used for other purpose in platform. So, we shouldn't
646 * overwrite these bits. This macro, reads given register again, preserves other
647 * bit values (non-plgpio bits), and retain captured value (plgpio bits).
648 */
649#define plgpio_prepare_reg(__reg, _off, _mask, _tmp) \
650{ \
651 _tmp = readl_relaxed(plgpio->regs.__reg + _off); \
652 _tmp &= ~_mask; \
653 plgpio->csave_regs[i].__reg = \
654 _tmp | (plgpio->csave_regs[i].__reg & _mask); \
655}
656
657static int plgpio_resume(struct device *dev)
658{
659 struct plgpio *plgpio = dev_get_drvdata(dev);
660 int i, reg_count = DIV_ROUND_UP(plgpio->chip.ngpio, MAX_GPIO_PER_REG);
661 void __iomem *off;
662 u32 mask, tmp;
663
664 for (i = 0; i < reg_count; i++) {
665 off = plgpio->base + i * sizeof(int *);
666
667 if (i == reg_count - 1) {
668 mask = (1 << (plgpio->chip.ngpio - i *
669 MAX_GPIO_PER_REG)) - 1;
670
671 if (plgpio->regs.enb != -1)
672 plgpio_prepare_reg(enb, off, mask, tmp);
673
674 if (plgpio->regs.eit != -1)
675 plgpio_prepare_reg(eit, off, mask, tmp);
676
677 plgpio_prepare_reg(wdata, off, mask, tmp);
678 plgpio_prepare_reg(dir, off, mask, tmp);
679 plgpio_prepare_reg(ie, off, mask, tmp);
680 }
681
682 writel_relaxed(plgpio->csave_regs[i].wdata, plgpio->regs.wdata +
683 off);
684 writel_relaxed(plgpio->csave_regs[i].dir, plgpio->regs.dir +
685 off);
686
687 if (plgpio->regs.eit != -1)
688 writel_relaxed(plgpio->csave_regs[i].eit,
689 plgpio->regs.eit + off);
690
691 writel_relaxed(plgpio->csave_regs[i].ie, plgpio->regs.ie + off);
692
693 if (plgpio->regs.enb != -1)
694 writel_relaxed(plgpio->csave_regs[i].enb,
695 plgpio->regs.enb + off);
696 }
697
698 return 0;
699}
700#endif
701
702static SIMPLE_DEV_PM_OPS(plgpio_dev_pm_ops, plgpio_suspend, plgpio_resume);
703
704static const struct of_device_id plgpio_of_match[] = {
705 { .compatible = "st,spear-plgpio" },
706 {}
707};
604bb7da
VK		 708
709static struct platform_driver plgpio_driver = {
710 .probe = plgpio_probe,
711 .driver = {
604bb7da
VK		 712 .name = "spear-plgpio",
713 .pm = &plgpio_dev_pm_ops,
606fca94 714 .of_match_table = plgpio_of_match,
604bb7da
VK		 715 },
716};
717
718static int __init plgpio_init(void)
719{
720 return platform_driver_register(&plgpio_driver);
721}
722subsys_initcall(plgpio_init);
ubuntu-bionic-kernel mirror