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Anton Vorontsovaeec56e2010-10-27 15:33:15 -07001/*
Grant Likelyc103de22011-06-04 18:38:28 -06002 * Generic driver for memory-mapped GPIO controllers.
Anton Vorontsovaeec56e2010-10-27 15:33:15 -07003 *
4 * Copyright 2008 MontaVista Software, Inc.
5 * Copyright 2008,2010 Anton Vorontsov <cbouatmailru@gmail.com>
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the
9 * Free Software Foundation; either version 2 of the License, or (at your
10 * option) any later version.
11 *
12 * ....``.```~~~~````.`.`.`.`.```````'',,,.........`````......`.......
13 * ...`` ```````..
14 * ..The simplest form of a GPIO controller that the driver supports is``
15 * `.just a single "data" register, where GPIO state can be read and/or `
16 * `,..written. ,,..``~~~~ .....``.`.`.~~.```.`.........``````.```````
17 * `````````
18 ___
19_/~~|___/~| . ```~~~~~~ ___/___\___ ,~.`.`.`.`````.~~...,,,,...
20__________|~$@~~~ %~ /o*o*o*o*o*o\ .. Implementing such a GPIO .
21o ` ~~~~\___/~~~~ ` controller in FPGA is ,.`
22 `....trivial..'~`.```.```
23 * ```````
24 * .```````~~~~`..`.``.``.
25 * . The driver supports `... ,..```.`~~~```````````````....````.``,,
26 * . big-endian notation, just`. .. A bit more sophisticated controllers ,
27 * . register the device with -be`. .with a pair of set/clear-bit registers ,
28 * `.. suffix. ```~~`````....`.` . affecting the data register and the .`
29 * ``.`.``...``` ```.. output pins are also supported.`
30 * ^^ `````.`````````.,``~``~``~~``````
31 * . ^^
32 * ,..`.`.`...````````````......`.`.`.`.`.`..`.`.`..
33 * .. The expectation is that in at least some cases . ,-~~~-,
34 * .this will be used with roll-your-own ASIC/FPGA .` \ /
35 * .logic in Verilog or VHDL. ~~~`````````..`````~~` \ /
36 * ..````````......``````````` \o_
37 * |
38 * ^^ / \
39 *
40 * ...`````~~`.....``.`..........``````.`.``.```........``.
41 * ` 8, 16, 32 and 64 bits registers are supported, and``.
42 * . the number of GPIOs is determined by the width of ~
43 * .. the registers. ,............```.`.`..`.`.~~~.`.`.`~
44 * `.......````.```
45 */
46
47#include <linux/init.h>
Jamie Iles280df6b2011-05-20 00:40:19 -060048#include <linux/err.h>
Anton Vorontsovaeec56e2010-10-27 15:33:15 -070049#include <linux/bug.h>
50#include <linux/kernel.h>
51#include <linux/module.h>
52#include <linux/spinlock.h>
53#include <linux/compiler.h>
54#include <linux/types.h>
55#include <linux/errno.h>
56#include <linux/log2.h>
57#include <linux/ioport.h>
58#include <linux/io.h>
59#include <linux/gpio.h>
60#include <linux/slab.h>
61#include <linux/platform_device.h>
62#include <linux/mod_devicetable.h>
63#include <linux/basic_mmio_gpio.h>
64
Jamie Iles8467afe2011-05-20 00:40:14 -060065static void bgpio_write8(void __iomem *reg, unsigned long data)
Anton Vorontsovaeec56e2010-10-27 15:33:15 -070066{
Jamie Ilesfd996232011-05-20 00:40:17 -060067 writeb(data, reg);
Anton Vorontsovaeec56e2010-10-27 15:33:15 -070068}
69
Jamie Iles8467afe2011-05-20 00:40:14 -060070static unsigned long bgpio_read8(void __iomem *reg)
Anton Vorontsovaeec56e2010-10-27 15:33:15 -070071{
Jamie Ilesfd996232011-05-20 00:40:17 -060072 return readb(reg);
Anton Vorontsovaeec56e2010-10-27 15:33:15 -070073}
74
Jamie Iles8467afe2011-05-20 00:40:14 -060075static void bgpio_write16(void __iomem *reg, unsigned long data)
76{
Jamie Ilesfd996232011-05-20 00:40:17 -060077 writew(data, reg);
Jamie Iles8467afe2011-05-20 00:40:14 -060078}
79
80static unsigned long bgpio_read16(void __iomem *reg)
81{
Jamie Ilesfd996232011-05-20 00:40:17 -060082 return readw(reg);
Jamie Iles8467afe2011-05-20 00:40:14 -060083}
84
85static void bgpio_write32(void __iomem *reg, unsigned long data)
86{
Jamie Ilesfd996232011-05-20 00:40:17 -060087 writel(data, reg);
Jamie Iles8467afe2011-05-20 00:40:14 -060088}
89
90static unsigned long bgpio_read32(void __iomem *reg)
91{
Jamie Ilesfd996232011-05-20 00:40:17 -060092 return readl(reg);
Jamie Iles8467afe2011-05-20 00:40:14 -060093}
94
95#if BITS_PER_LONG >= 64
96static void bgpio_write64(void __iomem *reg, unsigned long data)
97{
Jamie Ilesfd996232011-05-20 00:40:17 -060098 writeq(data, reg);
Jamie Iles8467afe2011-05-20 00:40:14 -060099}
100
101static unsigned long bgpio_read64(void __iomem *reg)
102{
Jamie Ilesfd996232011-05-20 00:40:17 -0600103 return readq(reg);
Jamie Iles8467afe2011-05-20 00:40:14 -0600104}
105#endif /* BITS_PER_LONG >= 64 */
106
Andreas Larsson2b78f1e2013-03-15 14:45:38 +0100107static void bgpio_write16be(void __iomem *reg, unsigned long data)
108{
109 iowrite16be(data, reg);
110}
111
112static unsigned long bgpio_read16be(void __iomem *reg)
113{
114 return ioread16be(reg);
115}
116
117static void bgpio_write32be(void __iomem *reg, unsigned long data)
118{
119 iowrite32be(data, reg);
120}
121
122static unsigned long bgpio_read32be(void __iomem *reg)
123{
124 return ioread32be(reg);
125}
126
Anton Vorontsovaeec56e2010-10-27 15:33:15 -0700127static unsigned long bgpio_pin2mask(struct bgpio_chip *bgc, unsigned int pin)
128{
Jamie Iles8467afe2011-05-20 00:40:14 -0600129 return 1 << pin;
130}
131
132static unsigned long bgpio_pin2mask_be(struct bgpio_chip *bgc,
133 unsigned int pin)
134{
135 return 1 << (bgc->bits - 1 - pin);
Anton Vorontsovaeec56e2010-10-27 15:33:15 -0700136}
137
Vladimir Zapolskiyb19e7f52015-04-29 18:34:59 +0300138static int bgpio_get_set(struct gpio_chip *gc, unsigned int gpio)
139{
140 struct bgpio_chip *bgc = to_bgpio_chip(gc);
141 unsigned long pinmask = bgc->pin2mask(bgc, gpio);
142
143 if (bgc->dir & pinmask)
144 return bgc->read_reg(bgc->reg_set) & pinmask;
145 else
146 return bgc->read_reg(bgc->reg_dat) & pinmask;
147}
148
Anton Vorontsovaeec56e2010-10-27 15:33:15 -0700149static int bgpio_get(struct gpio_chip *gc, unsigned int gpio)
150{
151 struct bgpio_chip *bgc = to_bgpio_chip(gc);
152
Linus Walleij25b35da2014-02-05 14:08:02 +0100153 return !!(bgc->read_reg(bgc->reg_dat) & bgc->pin2mask(bgc, gpio));
Anton Vorontsovaeec56e2010-10-27 15:33:15 -0700154}
155
156static void bgpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
157{
158 struct bgpio_chip *bgc = to_bgpio_chip(gc);
Jamie Iles8467afe2011-05-20 00:40:14 -0600159 unsigned long mask = bgc->pin2mask(bgc, gpio);
Anton Vorontsovaeec56e2010-10-27 15:33:15 -0700160 unsigned long flags;
161
Anton Vorontsovaeec56e2010-10-27 15:33:15 -0700162 spin_lock_irqsave(&bgc->lock, flags);
163
164 if (val)
165 bgc->data |= mask;
166 else
167 bgc->data &= ~mask;
168
Jamie Iles8467afe2011-05-20 00:40:14 -0600169 bgc->write_reg(bgc->reg_dat, bgc->data);
Anton Vorontsovaeec56e2010-10-27 15:33:15 -0700170
171 spin_unlock_irqrestore(&bgc->lock, flags);
172}
173
Jamie Ilese027d6f2011-05-20 00:40:16 -0600174static void bgpio_set_with_clear(struct gpio_chip *gc, unsigned int gpio,
175 int val)
176{
177 struct bgpio_chip *bgc = to_bgpio_chip(gc);
178 unsigned long mask = bgc->pin2mask(bgc, gpio);
179
180 if (val)
181 bgc->write_reg(bgc->reg_set, mask);
182 else
183 bgc->write_reg(bgc->reg_clr, mask);
184}
185
Jamie Ilesdd86a0c2011-05-20 00:40:16 -0600186static void bgpio_set_set(struct gpio_chip *gc, unsigned int gpio, int val)
187{
188 struct bgpio_chip *bgc = to_bgpio_chip(gc);
189 unsigned long mask = bgc->pin2mask(bgc, gpio);
190 unsigned long flags;
191
192 spin_lock_irqsave(&bgc->lock, flags);
193
194 if (val)
195 bgc->data |= mask;
196 else
197 bgc->data &= ~mask;
198
199 bgc->write_reg(bgc->reg_set, bgc->data);
200
201 spin_unlock_irqrestore(&bgc->lock, flags);
202}
203
Rojhalat Ibrahim73c4ced2015-01-14 15:46:38 +0100204static void bgpio_multiple_get_masks(struct bgpio_chip *bgc,
205 unsigned long *mask, unsigned long *bits,
206 unsigned long *set_mask,
207 unsigned long *clear_mask)
208{
209 int i;
210
211 *set_mask = 0;
212 *clear_mask = 0;
213
214 for (i = 0; i < bgc->bits; i++) {
215 if (*mask == 0)
216 break;
217 if (__test_and_clear_bit(i, mask)) {
218 if (test_bit(i, bits))
219 *set_mask |= bgc->pin2mask(bgc, i);
220 else
221 *clear_mask |= bgc->pin2mask(bgc, i);
222 }
223 }
224}
225
226static void bgpio_set_multiple_single_reg(struct bgpio_chip *bgc,
227 unsigned long *mask,
228 unsigned long *bits,
229 void __iomem *reg)
230{
231 unsigned long flags;
232 unsigned long set_mask, clear_mask;
233
234 spin_lock_irqsave(&bgc->lock, flags);
235
236 bgpio_multiple_get_masks(bgc, mask, bits, &set_mask, &clear_mask);
237
238 bgc->data |= set_mask;
239 bgc->data &= ~clear_mask;
240
241 bgc->write_reg(reg, bgc->data);
242
243 spin_unlock_irqrestore(&bgc->lock, flags);
244}
245
246static void bgpio_set_multiple(struct gpio_chip *gc, unsigned long *mask,
247 unsigned long *bits)
248{
249 struct bgpio_chip *bgc = to_bgpio_chip(gc);
250
251 bgpio_set_multiple_single_reg(bgc, mask, bits, bgc->reg_dat);
252}
253
254static void bgpio_set_multiple_set(struct gpio_chip *gc, unsigned long *mask,
255 unsigned long *bits)
256{
257 struct bgpio_chip *bgc = to_bgpio_chip(gc);
258
259 bgpio_set_multiple_single_reg(bgc, mask, bits, bgc->reg_set);
260}
261
262static void bgpio_set_multiple_with_clear(struct gpio_chip *gc,
263 unsigned long *mask,
264 unsigned long *bits)
265{
266 struct bgpio_chip *bgc = to_bgpio_chip(gc);
267 unsigned long set_mask, clear_mask;
268
269 bgpio_multiple_get_masks(bgc, mask, bits, &set_mask, &clear_mask);
270
271 if (set_mask)
272 bgc->write_reg(bgc->reg_set, set_mask);
273 if (clear_mask)
274 bgc->write_reg(bgc->reg_clr, clear_mask);
275}
276
Jamie Iles31029112011-05-20 00:40:17 -0600277static int bgpio_simple_dir_in(struct gpio_chip *gc, unsigned int gpio)
278{
279 return 0;
280}
281
282static int bgpio_simple_dir_out(struct gpio_chip *gc, unsigned int gpio,
283 int val)
284{
285 gc->set(gc, gpio, val);
286
287 return 0;
288}
289
Anton Vorontsovaeec56e2010-10-27 15:33:15 -0700290static int bgpio_dir_in(struct gpio_chip *gc, unsigned int gpio)
291{
Jamie Iles31029112011-05-20 00:40:17 -0600292 struct bgpio_chip *bgc = to_bgpio_chip(gc);
293 unsigned long flags;
294
295 spin_lock_irqsave(&bgc->lock, flags);
296
297 bgc->dir &= ~bgc->pin2mask(bgc, gpio);
298 bgc->write_reg(bgc->reg_dir, bgc->dir);
299
300 spin_unlock_irqrestore(&bgc->lock, flags);
301
Anton Vorontsovaeec56e2010-10-27 15:33:15 -0700302 return 0;
303}
304
305static int bgpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
306{
Jamie Iles31029112011-05-20 00:40:17 -0600307 struct bgpio_chip *bgc = to_bgpio_chip(gc);
308 unsigned long flags;
309
Jamie Ilese027d6f2011-05-20 00:40:16 -0600310 gc->set(gc, gpio, val);
311
Jamie Iles31029112011-05-20 00:40:17 -0600312 spin_lock_irqsave(&bgc->lock, flags);
313
314 bgc->dir |= bgc->pin2mask(bgc, gpio);
315 bgc->write_reg(bgc->reg_dir, bgc->dir);
316
317 spin_unlock_irqrestore(&bgc->lock, flags);
318
319 return 0;
320}
321
322static int bgpio_dir_in_inv(struct gpio_chip *gc, unsigned int gpio)
323{
324 struct bgpio_chip *bgc = to_bgpio_chip(gc);
325 unsigned long flags;
326
327 spin_lock_irqsave(&bgc->lock, flags);
328
329 bgc->dir |= bgc->pin2mask(bgc, gpio);
330 bgc->write_reg(bgc->reg_dir, bgc->dir);
331
332 spin_unlock_irqrestore(&bgc->lock, flags);
333
334 return 0;
335}
336
337static int bgpio_dir_out_inv(struct gpio_chip *gc, unsigned int gpio, int val)
338{
339 struct bgpio_chip *bgc = to_bgpio_chip(gc);
340 unsigned long flags;
341
342 gc->set(gc, gpio, val);
343
344 spin_lock_irqsave(&bgc->lock, flags);
345
346 bgc->dir &= ~bgc->pin2mask(bgc, gpio);
347 bgc->write_reg(bgc->reg_dir, bgc->dir);
348
349 spin_unlock_irqrestore(&bgc->lock, flags);
350
Anton Vorontsovaeec56e2010-10-27 15:33:15 -0700351 return 0;
352}
353
Jamie Iles280df6b2011-05-20 00:40:19 -0600354static int bgpio_setup_accessors(struct device *dev,
355 struct bgpio_chip *bgc,
Andreas Larsson2b78f1e2013-03-15 14:45:38 +0100356 bool bit_be,
357 bool byte_be)
Jamie Iles364b5e82011-05-20 00:40:16 -0600358{
Jamie Iles8467afe2011-05-20 00:40:14 -0600359
360 switch (bgc->bits) {
361 case 8:
362 bgc->read_reg = bgpio_read8;
363 bgc->write_reg = bgpio_write8;
364 break;
365 case 16:
Andreas Larsson2b78f1e2013-03-15 14:45:38 +0100366 if (byte_be) {
367 bgc->read_reg = bgpio_read16be;
368 bgc->write_reg = bgpio_write16be;
369 } else {
370 bgc->read_reg = bgpio_read16;
371 bgc->write_reg = bgpio_write16;
372 }
Jamie Iles8467afe2011-05-20 00:40:14 -0600373 break;
374 case 32:
Andreas Larsson2b78f1e2013-03-15 14:45:38 +0100375 if (byte_be) {
376 bgc->read_reg = bgpio_read32be;
377 bgc->write_reg = bgpio_write32be;
378 } else {
379 bgc->read_reg = bgpio_read32;
380 bgc->write_reg = bgpio_write32;
381 }
Jamie Iles8467afe2011-05-20 00:40:14 -0600382 break;
383#if BITS_PER_LONG >= 64
384 case 64:
Andreas Larsson2b78f1e2013-03-15 14:45:38 +0100385 if (byte_be) {
386 dev_err(dev,
387 "64 bit big endian byte order unsupported\n");
388 return -EINVAL;
389 } else {
390 bgc->read_reg = bgpio_read64;
391 bgc->write_reg = bgpio_write64;
392 }
Jamie Iles8467afe2011-05-20 00:40:14 -0600393 break;
394#endif /* BITS_PER_LONG >= 64 */
395 default:
Jamie Iles280df6b2011-05-20 00:40:19 -0600396 dev_err(dev, "unsupported data width %u bits\n", bgc->bits);
Jamie Iles8467afe2011-05-20 00:40:14 -0600397 return -EINVAL;
398 }
399
Andreas Larsson2b78f1e2013-03-15 14:45:38 +0100400 bgc->pin2mask = bit_be ? bgpio_pin2mask_be : bgpio_pin2mask;
Jamie Iles8467afe2011-05-20 00:40:14 -0600401
402 return 0;
403}
404
Jamie Ilese027d6f2011-05-20 00:40:16 -0600405/*
406 * Create the device and allocate the resources. For setting GPIO's there are
Jamie Ilesdd86a0c2011-05-20 00:40:16 -0600407 * three supported configurations:
Jamie Ilese027d6f2011-05-20 00:40:16 -0600408 *
Jamie Ilesdd86a0c2011-05-20 00:40:16 -0600409 * - single input/output register resource (named "dat").
Jamie Ilese027d6f2011-05-20 00:40:16 -0600410 * - set/clear pair (named "set" and "clr").
Jamie Ilesdd86a0c2011-05-20 00:40:16 -0600411 * - single output register resource and single input resource ("set" and
412 * dat").
Jamie Ilese027d6f2011-05-20 00:40:16 -0600413 *
414 * For the single output register, this drives a 1 by setting a bit and a zero
415 * by clearing a bit. For the set clr pair, this drives a 1 by setting a bit
416 * in the set register and clears it by setting a bit in the clear register.
417 * The configuration is detected by which resources are present.
Jamie Iles31029112011-05-20 00:40:17 -0600418 *
419 * For setting the GPIO direction, there are three supported configurations:
420 *
421 * - simple bidirection GPIO that requires no configuration.
422 * - an output direction register (named "dirout") where a 1 bit
423 * indicates the GPIO is an output.
424 * - an input direction register (named "dirin") where a 1 bit indicates
425 * the GPIO is an input.
Jamie Ilese027d6f2011-05-20 00:40:16 -0600426 */
Jamie Iles280df6b2011-05-20 00:40:19 -0600427static int bgpio_setup_io(struct bgpio_chip *bgc,
428 void __iomem *dat,
429 void __iomem *set,
Vladimir Zapolskiyb19e7f52015-04-29 18:34:59 +0300430 void __iomem *clr,
431 unsigned long flags)
Jamie Iles8467afe2011-05-20 00:40:14 -0600432{
Anton Vorontsovaeec56e2010-10-27 15:33:15 -0700433
Jamie Iles280df6b2011-05-20 00:40:19 -0600434 bgc->reg_dat = dat;
Anton Vorontsovaeec56e2010-10-27 15:33:15 -0700435 if (!bgc->reg_dat)
Jamie Iles280df6b2011-05-20 00:40:19 -0600436 return -EINVAL;
Anton Vorontsovaeec56e2010-10-27 15:33:15 -0700437
Jamie Iles280df6b2011-05-20 00:40:19 -0600438 if (set && clr) {
439 bgc->reg_set = set;
440 bgc->reg_clr = clr;
Jamie Ilese027d6f2011-05-20 00:40:16 -0600441 bgc->gc.set = bgpio_set_with_clear;
Rojhalat Ibrahim73c4ced2015-01-14 15:46:38 +0100442 bgc->gc.set_multiple = bgpio_set_multiple_with_clear;
Jamie Iles280df6b2011-05-20 00:40:19 -0600443 } else if (set && !clr) {
444 bgc->reg_set = set;
Jamie Ilesdd86a0c2011-05-20 00:40:16 -0600445 bgc->gc.set = bgpio_set_set;
Rojhalat Ibrahim73c4ced2015-01-14 15:46:38 +0100446 bgc->gc.set_multiple = bgpio_set_multiple_set;
Jamie Ilese027d6f2011-05-20 00:40:16 -0600447 } else {
448 bgc->gc.set = bgpio_set;
Rojhalat Ibrahim73c4ced2015-01-14 15:46:38 +0100449 bgc->gc.set_multiple = bgpio_set_multiple;
Anton Vorontsovaeec56e2010-10-27 15:33:15 -0700450 }
451
Vladimir Zapolskiyb19e7f52015-04-29 18:34:59 +0300452 if (!(flags & BGPIOF_UNREADABLE_REG_SET) &&
453 (flags & BGPIOF_READ_OUTPUT_REG_SET))
454 bgc->gc.get = bgpio_get_set;
455 else
456 bgc->gc.get = bgpio_get;
Jamie Ilesdd86a0c2011-05-20 00:40:16 -0600457
Jamie Ilese027d6f2011-05-20 00:40:16 -0600458 return 0;
459}
Anton Vorontsovaeec56e2010-10-27 15:33:15 -0700460
Jamie Iles280df6b2011-05-20 00:40:19 -0600461static int bgpio_setup_direction(struct bgpio_chip *bgc,
462 void __iomem *dirout,
463 void __iomem *dirin)
Jamie Iles31029112011-05-20 00:40:17 -0600464{
Jamie Iles280df6b2011-05-20 00:40:19 -0600465 if (dirout && dirin) {
Jamie Iles31029112011-05-20 00:40:17 -0600466 return -EINVAL;
Jamie Iles280df6b2011-05-20 00:40:19 -0600467 } else if (dirout) {
468 bgc->reg_dir = dirout;
Jamie Iles31029112011-05-20 00:40:17 -0600469 bgc->gc.direction_output = bgpio_dir_out;
470 bgc->gc.direction_input = bgpio_dir_in;
Jamie Iles280df6b2011-05-20 00:40:19 -0600471 } else if (dirin) {
472 bgc->reg_dir = dirin;
Jamie Iles31029112011-05-20 00:40:17 -0600473 bgc->gc.direction_output = bgpio_dir_out_inv;
474 bgc->gc.direction_input = bgpio_dir_in_inv;
475 } else {
476 bgc->gc.direction_output = bgpio_simple_dir_out;
477 bgc->gc.direction_input = bgpio_simple_dir_in;
478 }
479
480 return 0;
481}
482
Anthony Fee7b42e3d2014-05-19 18:49:14 +0100483static int bgpio_request(struct gpio_chip *chip, unsigned gpio_pin)
484{
485 if (gpio_pin < chip->ngpio)
486 return 0;
487
488 return -EINVAL;
489}
490
Russell King4f5b0482011-09-14 16:22:29 -0700491int bgpio_remove(struct bgpio_chip *bgc)
Jamie Ilese027d6f2011-05-20 00:40:16 -0600492{
abdoulaye berthe9f5132a2014-07-12 22:30:12 +0200493 gpiochip_remove(&bgc->gc);
494 return 0;
Jamie Iles280df6b2011-05-20 00:40:19 -0600495}
496EXPORT_SYMBOL_GPL(bgpio_remove);
497
Russell King4f5b0482011-09-14 16:22:29 -0700498int bgpio_init(struct bgpio_chip *bgc, struct device *dev,
499 unsigned long sz, void __iomem *dat, void __iomem *set,
500 void __iomem *clr, void __iomem *dirout, void __iomem *dirin,
Shawn Guo3e11f7b2012-05-19 21:34:58 +0800501 unsigned long flags)
Jamie Iles280df6b2011-05-20 00:40:19 -0600502{
Jamie Ilese027d6f2011-05-20 00:40:16 -0600503 int ret;
Jamie Ilese027d6f2011-05-20 00:40:16 -0600504
Jamie Iles280df6b2011-05-20 00:40:19 -0600505 if (!is_power_of_2(sz))
506 return -EINVAL;
Jamie Ilese027d6f2011-05-20 00:40:16 -0600507
Jamie Iles280df6b2011-05-20 00:40:19 -0600508 bgc->bits = sz * 8;
509 if (bgc->bits > BITS_PER_LONG)
510 return -EINVAL;
Anton Vorontsovaeec56e2010-10-27 15:33:15 -0700511
Jamie Ilese027d6f2011-05-20 00:40:16 -0600512 spin_lock_init(&bgc->lock);
Jamie Iles280df6b2011-05-20 00:40:19 -0600513 bgc->gc.dev = dev;
514 bgc->gc.label = dev_name(dev);
515 bgc->gc.base = -1;
516 bgc->gc.ngpio = bgc->bits;
Anthony Fee7b42e3d2014-05-19 18:49:14 +0100517 bgc->gc.request = bgpio_request;
Jamie Iles280df6b2011-05-20 00:40:19 -0600518
Vladimir Zapolskiyb19e7f52015-04-29 18:34:59 +0300519 ret = bgpio_setup_io(bgc, dat, set, clr, flags);
Jamie Iles280df6b2011-05-20 00:40:19 -0600520 if (ret)
521 return ret;
522
Andreas Larsson2b78f1e2013-03-15 14:45:38 +0100523 ret = bgpio_setup_accessors(dev, bgc, flags & BGPIOF_BIG_ENDIAN,
524 flags & BGPIOF_BIG_ENDIAN_BYTE_ORDER);
Jamie Iles280df6b2011-05-20 00:40:19 -0600525 if (ret)
526 return ret;
527
528 ret = bgpio_setup_direction(bgc, dirout, dirin);
Jamie Iles31029112011-05-20 00:40:17 -0600529 if (ret)
530 return ret;
531
Jamie Iles8467afe2011-05-20 00:40:14 -0600532 bgc->data = bgc->read_reg(bgc->reg_dat);
Shawn Guo3e11f7b2012-05-19 21:34:58 +0800533 if (bgc->gc.set == bgpio_set_set &&
534 !(flags & BGPIOF_UNREADABLE_REG_SET))
535 bgc->data = bgc->read_reg(bgc->reg_set);
536 if (bgc->reg_dir && !(flags & BGPIOF_UNREADABLE_REG_DIR))
537 bgc->dir = bgc->read_reg(bgc->reg_dir);
Jamie Iles924e7a92011-05-20 00:40:15 -0600538
Jamie Iles280df6b2011-05-20 00:40:19 -0600539 return ret;
540}
541EXPORT_SYMBOL_GPL(bgpio_init);
Anton Vorontsovaeec56e2010-10-27 15:33:15 -0700542
Grant Likelyc103de22011-06-04 18:38:28 -0600543#ifdef CONFIG_GPIO_GENERIC_PLATFORM
Anton Vorontsovaeec56e2010-10-27 15:33:15 -0700544
Jamie Iles280df6b2011-05-20 00:40:19 -0600545static void __iomem *bgpio_map(struct platform_device *pdev,
546 const char *name,
547 resource_size_t sane_sz,
548 int *err)
549{
550 struct device *dev = &pdev->dev;
551 struct resource *r;
552 resource_size_t start;
553 resource_size_t sz;
554 void __iomem *ret;
555
556 *err = 0;
557
558 r = platform_get_resource_byname(pdev, IORESOURCE_MEM, name);
559 if (!r)
560 return NULL;
561
562 sz = resource_size(r);
563 if (sz != sane_sz) {
564 *err = -EINVAL;
565 return NULL;
566 }
567
568 start = r->start;
569 if (!devm_request_mem_region(dev, start, sz, r->name)) {
570 *err = -EBUSY;
571 return NULL;
572 }
573
574 ret = devm_ioremap(dev, start, sz);
575 if (!ret) {
576 *err = -ENOMEM;
577 return NULL;
578 }
Anton Vorontsovaeec56e2010-10-27 15:33:15 -0700579
580 return ret;
581}
582
Bill Pemberton38363092012-11-19 13:22:34 -0500583static int bgpio_pdev_probe(struct platform_device *pdev)
Jamie Iles280df6b2011-05-20 00:40:19 -0600584{
585 struct device *dev = &pdev->dev;
586 struct resource *r;
587 void __iomem *dat;
588 void __iomem *set;
589 void __iomem *clr;
590 void __iomem *dirout;
591 void __iomem *dirin;
592 unsigned long sz;
Alexander Shiyan19338532014-03-16 09:10:34 +0400593 unsigned long flags = pdev->id_entry->driver_data;
Jamie Iles280df6b2011-05-20 00:40:19 -0600594 int err;
595 struct bgpio_chip *bgc;
596 struct bgpio_pdata *pdata = dev_get_platdata(dev);
597
598 r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dat");
599 if (!r)
600 return -EINVAL;
601
602 sz = resource_size(r);
603
604 dat = bgpio_map(pdev, "dat", sz, &err);
605 if (!dat)
606 return err ? err : -EINVAL;
607
608 set = bgpio_map(pdev, "set", sz, &err);
609 if (err)
610 return err;
611
612 clr = bgpio_map(pdev, "clr", sz, &err);
613 if (err)
614 return err;
615
616 dirout = bgpio_map(pdev, "dirout", sz, &err);
617 if (err)
618 return err;
619
620 dirin = bgpio_map(pdev, "dirin", sz, &err);
621 if (err)
622 return err;
623
Jamie Iles280df6b2011-05-20 00:40:19 -0600624 bgc = devm_kzalloc(&pdev->dev, sizeof(*bgc), GFP_KERNEL);
625 if (!bgc)
626 return -ENOMEM;
627
Shawn Guo3e11f7b2012-05-19 21:34:58 +0800628 err = bgpio_init(bgc, dev, sz, dat, set, clr, dirout, dirin, flags);
Jamie Iles280df6b2011-05-20 00:40:19 -0600629 if (err)
630 return err;
631
632 if (pdata) {
Pawel Moll781f6d72014-01-30 13:18:57 +0000633 if (pdata->label)
634 bgc->gc.label = pdata->label;
Jamie Iles280df6b2011-05-20 00:40:19 -0600635 bgc->gc.base = pdata->base;
636 if (pdata->ngpio > 0)
637 bgc->gc.ngpio = pdata->ngpio;
638 }
639
640 platform_set_drvdata(pdev, bgc);
641
642 return gpiochip_add(&bgc->gc);
643}
644
Bill Pemberton206210c2012-11-19 13:25:50 -0500645static int bgpio_pdev_remove(struct platform_device *pdev)
Anton Vorontsovaeec56e2010-10-27 15:33:15 -0700646{
Jamie Iles4ddb8ae2011-05-20 00:40:14 -0600647 struct bgpio_chip *bgc = platform_get_drvdata(pdev);
Anton Vorontsovaeec56e2010-10-27 15:33:15 -0700648
Jamie Iles280df6b2011-05-20 00:40:19 -0600649 return bgpio_remove(bgc);
Anton Vorontsovaeec56e2010-10-27 15:33:15 -0700650}
651
652static const struct platform_device_id bgpio_id_table[] = {
Alexander Shiyan19338532014-03-16 09:10:34 +0400653 {
654 .name = "basic-mmio-gpio",
655 .driver_data = 0,
656 }, {
657 .name = "basic-mmio-gpio-be",
658 .driver_data = BGPIOF_BIG_ENDIAN,
659 },
660 { }
Anton Vorontsovaeec56e2010-10-27 15:33:15 -0700661};
662MODULE_DEVICE_TABLE(platform, bgpio_id_table);
663
664static struct platform_driver bgpio_driver = {
665 .driver = {
666 .name = "basic-mmio-gpio",
667 },
668 .id_table = bgpio_id_table,
Jamie Iles280df6b2011-05-20 00:40:19 -0600669 .probe = bgpio_pdev_probe,
Bill Pemberton8283c4f2012-11-19 13:20:08 -0500670 .remove = bgpio_pdev_remove,
Anton Vorontsovaeec56e2010-10-27 15:33:15 -0700671};
672
Mark Brown6f614152011-12-08 00:24:00 +0800673module_platform_driver(bgpio_driver);
Jamie Iles280df6b2011-05-20 00:40:19 -0600674
Grant Likelyc103de22011-06-04 18:38:28 -0600675#endif /* CONFIG_GPIO_GENERIC_PLATFORM */
Anton Vorontsovaeec56e2010-10-27 15:33:15 -0700676
677MODULE_DESCRIPTION("Driver for basic memory-mapped GPIO controllers");
678MODULE_AUTHOR("Anton Vorontsov <cbouatmailru@gmail.com>");
679MODULE_LICENSE("GPL");