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1// SPDX-License-Identifier: GPL-2.0
2/* Copyright (C) 2020 Daniel Palmer<daniel@thingy.jp> */
3
4#include <linux/bitops.h>
5#include <linux/kernel.h>
6#include <linux/types.h>
7#include <linux/io.h>
8#include <linux/of.h>
9#include <linux/of_device.h>
10#include <linux/of_irq.h>
11#include <linux/gpio/driver.h>
12#include <linux/module.h>
13#include <linux/platform_device.h>
14
15#include <dt-bindings/gpio/msc313-gpio.h>
16#include <dt-bindings/interrupt-controller/arm-gic.h>
17
18#define DRIVER_NAME "gpio-msc313"
19
20#define MSC313_GPIO_IN BIT(0)
21#define MSC313_GPIO_OUT BIT(4)
22#define MSC313_GPIO_OEN BIT(5)
23
24/*
25 * These bits need to be saved to correctly restore the
26 * gpio state when resuming from suspend to memory.
27 */
28#define MSC313_GPIO_BITSTOSAVE (MSC313_GPIO_OUT | MSC313_GPIO_OEN)
29
30/* pad names for fuart, same for all SoCs so far */
31#define MSC313_PINNAME_FUART_RX "fuart_rx"
32#define MSC313_PINNAME_FUART_TX "fuart_tx"
33#define MSC313_PINNAME_FUART_CTS "fuart_cts"
34#define MSC313_PINNAME_FUART_RTS "fuart_rts"
35
36/* pad names for sr, mercury5 is different */
37#define MSC313_PINNAME_SR_IO2 "sr_io2"
38#define MSC313_PINNAME_SR_IO3 "sr_io3"
39#define MSC313_PINNAME_SR_IO4 "sr_io4"
40#define MSC313_PINNAME_SR_IO5 "sr_io5"
41#define MSC313_PINNAME_SR_IO6 "sr_io6"
42#define MSC313_PINNAME_SR_IO7 "sr_io7"
43#define MSC313_PINNAME_SR_IO8 "sr_io8"
44#define MSC313_PINNAME_SR_IO9 "sr_io9"
45#define MSC313_PINNAME_SR_IO10 "sr_io10"
46#define MSC313_PINNAME_SR_IO11 "sr_io11"
47#define MSC313_PINNAME_SR_IO12 "sr_io12"
48#define MSC313_PINNAME_SR_IO13 "sr_io13"
49#define MSC313_PINNAME_SR_IO14 "sr_io14"
50#define MSC313_PINNAME_SR_IO15 "sr_io15"
51#define MSC313_PINNAME_SR_IO16 "sr_io16"
52#define MSC313_PINNAME_SR_IO17 "sr_io17"
53
54/* pad names for sd, same for all SoCs so far */
55#define MSC313_PINNAME_SD_CLK "sd_clk"
56#define MSC313_PINNAME_SD_CMD "sd_cmd"
57#define MSC313_PINNAME_SD_D0 "sd_d0"
58#define MSC313_PINNAME_SD_D1 "sd_d1"
59#define MSC313_PINNAME_SD_D2 "sd_d2"
60#define MSC313_PINNAME_SD_D3 "sd_d3"
61
62/* pad names for i2c1, same for all SoCs so for */
63#define MSC313_PINNAME_I2C1_SCL "i2c1_scl"
64#define MSC313_PINNAME_I2C1_SCA "i2c1_sda"
65
66/* pad names for spi0, same for all SoCs so far */
67#define MSC313_PINNAME_SPI0_CZ "spi0_cz"
68#define MSC313_PINNAME_SPI0_CK "spi0_ck"
69#define MSC313_PINNAME_SPI0_DI "spi0_di"
70#define MSC313_PINNAME_SPI0_DO "spi0_do"
71
72#define FUART_NAMES \
73 MSC313_PINNAME_FUART_RX, \
74 MSC313_PINNAME_FUART_TX, \
75 MSC313_PINNAME_FUART_CTS, \
76 MSC313_PINNAME_FUART_RTS
77
78#define OFF_FUART_RX 0x50
79#define OFF_FUART_TX 0x54
80#define OFF_FUART_CTS 0x58
81#define OFF_FUART_RTS 0x5c
82
83#define FUART_OFFSETS \
84 OFF_FUART_RX, \
85 OFF_FUART_TX, \
86 OFF_FUART_CTS, \
87 OFF_FUART_RTS
88
89#define SR_NAMES \
90 MSC313_PINNAME_SR_IO2, \
91 MSC313_PINNAME_SR_IO3, \
92 MSC313_PINNAME_SR_IO4, \
93 MSC313_PINNAME_SR_IO5, \
94 MSC313_PINNAME_SR_IO6, \
95 MSC313_PINNAME_SR_IO7, \
96 MSC313_PINNAME_SR_IO8, \
97 MSC313_PINNAME_SR_IO9, \
98 MSC313_PINNAME_SR_IO10, \
99 MSC313_PINNAME_SR_IO11, \
100 MSC313_PINNAME_SR_IO12, \
101 MSC313_PINNAME_SR_IO13, \
102 MSC313_PINNAME_SR_IO14, \
103 MSC313_PINNAME_SR_IO15, \
104 MSC313_PINNAME_SR_IO16, \
105 MSC313_PINNAME_SR_IO17
106
107#define OFF_SR_IO2 0x88
108#define OFF_SR_IO3 0x8c
109#define OFF_SR_IO4 0x90
110#define OFF_SR_IO5 0x94
111#define OFF_SR_IO6 0x98
112#define OFF_SR_IO7 0x9c
113#define OFF_SR_IO8 0xa0
114#define OFF_SR_IO9 0xa4
115#define OFF_SR_IO10 0xa8
116#define OFF_SR_IO11 0xac
117#define OFF_SR_IO12 0xb0
118#define OFF_SR_IO13 0xb4
119#define OFF_SR_IO14 0xb8
120#define OFF_SR_IO15 0xbc
121#define OFF_SR_IO16 0xc0
122#define OFF_SR_IO17 0xc4
123
124#define SR_OFFSETS \
125 OFF_SR_IO2, \
126 OFF_SR_IO3, \
127 OFF_SR_IO4, \
128 OFF_SR_IO5, \
129 OFF_SR_IO6, \
130 OFF_SR_IO7, \
131 OFF_SR_IO8, \
132 OFF_SR_IO9, \
133 OFF_SR_IO10, \
134 OFF_SR_IO11, \
135 OFF_SR_IO12, \
136 OFF_SR_IO13, \
137 OFF_SR_IO14, \
138 OFF_SR_IO15, \
139 OFF_SR_IO16, \
140 OFF_SR_IO17
141
142#define SD_NAMES \
143 MSC313_PINNAME_SD_CLK, \
144 MSC313_PINNAME_SD_CMD, \
145 MSC313_PINNAME_SD_D0, \
146 MSC313_PINNAME_SD_D1, \
147 MSC313_PINNAME_SD_D2, \
148 MSC313_PINNAME_SD_D3
149
150#define OFF_SD_CLK 0x140
151#define OFF_SD_CMD 0x144
152#define OFF_SD_D0 0x148
153#define OFF_SD_D1 0x14c
154#define OFF_SD_D2 0x150
155#define OFF_SD_D3 0x154
156
157#define SD_OFFSETS \
158 OFF_SD_CLK, \
159 OFF_SD_CMD, \
160 OFF_SD_D0, \
161 OFF_SD_D1, \
162 OFF_SD_D2, \
163 OFF_SD_D3
164
165#define I2C1_NAMES \
166 MSC313_PINNAME_I2C1_SCL, \
167 MSC313_PINNAME_I2C1_SCA
168
169#define OFF_I2C1_SCL 0x188
170#define OFF_I2C1_SCA 0x18c
171
172#define I2C1_OFFSETS \
173 OFF_I2C1_SCL, \
174 OFF_I2C1_SCA
175
176#define SPI0_NAMES \
177 MSC313_PINNAME_SPI0_CZ, \
178 MSC313_PINNAME_SPI0_CK, \
179 MSC313_PINNAME_SPI0_DI, \
180 MSC313_PINNAME_SPI0_DO
181
182#define OFF_SPI0_CZ 0x1c0
183#define OFF_SPI0_CK 0x1c4
184#define OFF_SPI0_DI 0x1c8
185#define OFF_SPI0_DO 0x1cc
186
187#define SPI0_OFFSETS \
188 OFF_SPI0_CZ, \
189 OFF_SPI0_CK, \
190 OFF_SPI0_DI, \
191 OFF_SPI0_DO
192
193struct msc313_gpio_data {
194 const char * const *names;
195 const unsigned int *offsets;
196 const unsigned int num;
197};
198
199#define MSC313_GPIO_CHIPDATA(_chip) \
200static const struct msc313_gpio_data _chip##_data = { \
201 .names = _chip##_names, \
202 .offsets = _chip##_offsets, \
203 .num = ARRAY_SIZE(_chip##_offsets), \
204}
205
206#ifdef CONFIG_MACH_INFINITY
207static const char * const msc313_names[] = {
208 FUART_NAMES,
209 SR_NAMES,
210 SD_NAMES,
211 I2C1_NAMES,
212 SPI0_NAMES,
213};
214
215static const unsigned int msc313_offsets[] = {
216 FUART_OFFSETS,
217 SR_OFFSETS,
218 SD_OFFSETS,
219 I2C1_OFFSETS,
220 SPI0_OFFSETS,
221};
222
223MSC313_GPIO_CHIPDATA(msc313);
224
225/*
226 * Unlike the msc313(e) the ssd20xd have a bunch of pins
227 * that are actually called gpio probably because they
228 * have no dedicated function.
229 */
230#define SSD20XD_PINNAME_GPIO0 "gpio0"
231#define SSD20XD_PINNAME_GPIO1 "gpio1"
232#define SSD20XD_PINNAME_GPIO2 "gpio2"
233#define SSD20XD_PINNAME_GPIO3 "gpio3"
234#define SSD20XD_PINNAME_GPIO4 "gpio4"
235#define SSD20XD_PINNAME_GPIO5 "gpio5"
236#define SSD20XD_PINNAME_GPIO6 "gpio6"
237#define SSD20XD_PINNAME_GPIO7 "gpio7"
238#define SSD20XD_PINNAME_GPIO10 "gpio10"
239#define SSD20XD_PINNAME_GPIO11 "gpio11"
240#define SSD20XD_PINNAME_GPIO12 "gpio12"
241#define SSD20XD_PINNAME_GPIO13 "gpio13"
242#define SSD20XD_PINNAME_GPIO14 "gpio14"
243#define SSD20XD_PINNAME_GPIO85 "gpio85"
244#define SSD20XD_PINNAME_GPIO86 "gpio86"
245#define SSD20XD_PINNAME_GPIO90 "gpio90"
246
247#define SSD20XD_GPIO_NAMES SSD20XD_PINNAME_GPIO0, \
248 SSD20XD_PINNAME_GPIO1, \
249 SSD20XD_PINNAME_GPIO2, \
250 SSD20XD_PINNAME_GPIO3, \
251 SSD20XD_PINNAME_GPIO4, \
252 SSD20XD_PINNAME_GPIO5, \
253 SSD20XD_PINNAME_GPIO6, \
254 SSD20XD_PINNAME_GPIO7, \
255 SSD20XD_PINNAME_GPIO10, \
256 SSD20XD_PINNAME_GPIO11, \
257 SSD20XD_PINNAME_GPIO12, \
258 SSD20XD_PINNAME_GPIO13, \
259 SSD20XD_PINNAME_GPIO14, \
260 SSD20XD_PINNAME_GPIO85, \
261 SSD20XD_PINNAME_GPIO86, \
262 SSD20XD_PINNAME_GPIO90
263
264#define SSD20XD_GPIO_OFF_GPIO0 0x0
265#define SSD20XD_GPIO_OFF_GPIO1 0x4
266#define SSD20XD_GPIO_OFF_GPIO2 0x8
267#define SSD20XD_GPIO_OFF_GPIO3 0xc
268#define SSD20XD_GPIO_OFF_GPIO4 0x10
269#define SSD20XD_GPIO_OFF_GPIO5 0x14
270#define SSD20XD_GPIO_OFF_GPIO6 0x18
271#define SSD20XD_GPIO_OFF_GPIO7 0x1c
272#define SSD20XD_GPIO_OFF_GPIO10 0x28
273#define SSD20XD_GPIO_OFF_GPIO11 0x2c
274#define SSD20XD_GPIO_OFF_GPIO12 0x30
275#define SSD20XD_GPIO_OFF_GPIO13 0x34
276#define SSD20XD_GPIO_OFF_GPIO14 0x38
277#define SSD20XD_GPIO_OFF_GPIO85 0x100
278#define SSD20XD_GPIO_OFF_GPIO86 0x104
279#define SSD20XD_GPIO_OFF_GPIO90 0x114
280
281#define SSD20XD_GPIO_OFFSETS SSD20XD_GPIO_OFF_GPIO0, \
282 SSD20XD_GPIO_OFF_GPIO1, \
283 SSD20XD_GPIO_OFF_GPIO2, \
284 SSD20XD_GPIO_OFF_GPIO3, \
285 SSD20XD_GPIO_OFF_GPIO4, \
286 SSD20XD_GPIO_OFF_GPIO5, \
287 SSD20XD_GPIO_OFF_GPIO6, \
288 SSD20XD_GPIO_OFF_GPIO7, \
289 SSD20XD_GPIO_OFF_GPIO10, \
290 SSD20XD_GPIO_OFF_GPIO11, \
291 SSD20XD_GPIO_OFF_GPIO12, \
292 SSD20XD_GPIO_OFF_GPIO13, \
293 SSD20XD_GPIO_OFF_GPIO14, \
294 SSD20XD_GPIO_OFF_GPIO85, \
295 SSD20XD_GPIO_OFF_GPIO86, \
296 SSD20XD_GPIO_OFF_GPIO90
297
298/* "ttl" pins lcd interface pins */
299#define SSD20XD_PINNAME_TTL0 "ttl0"
300#define SSD20XD_PINNAME_TTL1 "ttl1"
301#define SSD20XD_PINNAME_TTL2 "ttl2"
302#define SSD20XD_PINNAME_TTL3 "ttl3"
303#define SSD20XD_PINNAME_TTL4 "ttl4"
304#define SSD20XD_PINNAME_TTL5 "ttl5"
305#define SSD20XD_PINNAME_TTL6 "ttl6"
306#define SSD20XD_PINNAME_TTL7 "ttl7"
307#define SSD20XD_PINNAME_TTL8 "ttl8"
308#define SSD20XD_PINNAME_TTL9 "ttl9"
309#define SSD20XD_PINNAME_TTL10 "ttl10"
310#define SSD20XD_PINNAME_TTL11 "ttl11"
311#define SSD20XD_PINNAME_TTL12 "ttl12"
312#define SSD20XD_PINNAME_TTL13 "ttl13"
313#define SSD20XD_PINNAME_TTL14 "ttl14"
314#define SSD20XD_PINNAME_TTL15 "ttl15"
315#define SSD20XD_PINNAME_TTL16 "ttl16"
316#define SSD20XD_PINNAME_TTL17 "ttl17"
317#define SSD20XD_PINNAME_TTL18 "ttl18"
318#define SSD20XD_PINNAME_TTL19 "ttl19"
319#define SSD20XD_PINNAME_TTL20 "ttl20"
320#define SSD20XD_PINNAME_TTL21 "ttl21"
321#define SSD20XD_PINNAME_TTL22 "ttl22"
322#define SSD20XD_PINNAME_TTL23 "ttl23"
323#define SSD20XD_PINNAME_TTL24 "ttl24"
324#define SSD20XD_PINNAME_TTL25 "ttl25"
325#define SSD20XD_PINNAME_TTL26 "ttl26"
326#define SSD20XD_PINNAME_TTL27 "ttl27"
327
328#define SSD20XD_TTL_PINNAMES SSD20XD_PINNAME_TTL0, \
329 SSD20XD_PINNAME_TTL1, \
330 SSD20XD_PINNAME_TTL2, \
331 SSD20XD_PINNAME_TTL3, \
332 SSD20XD_PINNAME_TTL4, \
333 SSD20XD_PINNAME_TTL5, \
334 SSD20XD_PINNAME_TTL6, \
335 SSD20XD_PINNAME_TTL7, \
336 SSD20XD_PINNAME_TTL8, \
337 SSD20XD_PINNAME_TTL9, \
338 SSD20XD_PINNAME_TTL10, \
339 SSD20XD_PINNAME_TTL11, \
340 SSD20XD_PINNAME_TTL12, \
341 SSD20XD_PINNAME_TTL13, \
342 SSD20XD_PINNAME_TTL14, \
343 SSD20XD_PINNAME_TTL15, \
344 SSD20XD_PINNAME_TTL16, \
345 SSD20XD_PINNAME_TTL17, \
346 SSD20XD_PINNAME_TTL18, \
347 SSD20XD_PINNAME_TTL19, \
348 SSD20XD_PINNAME_TTL20, \
349 SSD20XD_PINNAME_TTL21, \
350 SSD20XD_PINNAME_TTL22, \
351 SSD20XD_PINNAME_TTL23, \
352 SSD20XD_PINNAME_TTL24, \
353 SSD20XD_PINNAME_TTL25, \
354 SSD20XD_PINNAME_TTL26, \
355 SSD20XD_PINNAME_TTL27
356
357#define SSD20XD_TTL_OFFSET_TTL0 0x80
358#define SSD20XD_TTL_OFFSET_TTL1 0x84
359#define SSD20XD_TTL_OFFSET_TTL2 0x88
360#define SSD20XD_TTL_OFFSET_TTL3 0x8c
361#define SSD20XD_TTL_OFFSET_TTL4 0x90
362#define SSD20XD_TTL_OFFSET_TTL5 0x94
363#define SSD20XD_TTL_OFFSET_TTL6 0x98
364#define SSD20XD_TTL_OFFSET_TTL7 0x9c
365#define SSD20XD_TTL_OFFSET_TTL8 0xa0
366#define SSD20XD_TTL_OFFSET_TTL9 0xa4
367#define SSD20XD_TTL_OFFSET_TTL10 0xa8
368#define SSD20XD_TTL_OFFSET_TTL11 0xac
369#define SSD20XD_TTL_OFFSET_TTL12 0xb0
370#define SSD20XD_TTL_OFFSET_TTL13 0xb4
371#define SSD20XD_TTL_OFFSET_TTL14 0xb8
372#define SSD20XD_TTL_OFFSET_TTL15 0xbc
373#define SSD20XD_TTL_OFFSET_TTL16 0xc0
374#define SSD20XD_TTL_OFFSET_TTL17 0xc4
375#define SSD20XD_TTL_OFFSET_TTL18 0xc8
376#define SSD20XD_TTL_OFFSET_TTL19 0xcc
377#define SSD20XD_TTL_OFFSET_TTL20 0xd0
378#define SSD20XD_TTL_OFFSET_TTL21 0xd4
379#define SSD20XD_TTL_OFFSET_TTL22 0xd8
380#define SSD20XD_TTL_OFFSET_TTL23 0xdc
381#define SSD20XD_TTL_OFFSET_TTL24 0xe0
382#define SSD20XD_TTL_OFFSET_TTL25 0xe4
383#define SSD20XD_TTL_OFFSET_TTL26 0xe8
384#define SSD20XD_TTL_OFFSET_TTL27 0xec
385
386#define SSD20XD_TTL_OFFSETS SSD20XD_TTL_OFFSET_TTL0, \
387 SSD20XD_TTL_OFFSET_TTL1, \
388 SSD20XD_TTL_OFFSET_TTL2, \
389 SSD20XD_TTL_OFFSET_TTL3, \
390 SSD20XD_TTL_OFFSET_TTL4, \
391 SSD20XD_TTL_OFFSET_TTL5, \
392 SSD20XD_TTL_OFFSET_TTL6, \
393 SSD20XD_TTL_OFFSET_TTL7, \
394 SSD20XD_TTL_OFFSET_TTL8, \
395 SSD20XD_TTL_OFFSET_TTL9, \
396 SSD20XD_TTL_OFFSET_TTL10, \
397 SSD20XD_TTL_OFFSET_TTL11, \
398 SSD20XD_TTL_OFFSET_TTL12, \
399 SSD20XD_TTL_OFFSET_TTL13, \
400 SSD20XD_TTL_OFFSET_TTL14, \
401 SSD20XD_TTL_OFFSET_TTL15, \
402 SSD20XD_TTL_OFFSET_TTL16, \
403 SSD20XD_TTL_OFFSET_TTL17, \
404 SSD20XD_TTL_OFFSET_TTL18, \
405 SSD20XD_TTL_OFFSET_TTL19, \
406 SSD20XD_TTL_OFFSET_TTL20, \
407 SSD20XD_TTL_OFFSET_TTL21, \
408 SSD20XD_TTL_OFFSET_TTL22, \
409 SSD20XD_TTL_OFFSET_TTL23, \
410 SSD20XD_TTL_OFFSET_TTL24, \
411 SSD20XD_TTL_OFFSET_TTL25, \
412 SSD20XD_TTL_OFFSET_TTL26, \
413 SSD20XD_TTL_OFFSET_TTL27
414
415/* On the ssd20xd the two normal uarts have dedicated pins */
416#define SSD20XD_PINNAME_UART0_RX "uart0_rx"
417#define SSD20XD_PINNAME_UART0_TX "uart0_tx"
418
419#define SSD20XD_UART0_NAMES \
420 SSD20XD_PINNAME_UART0_RX, \
421 SSD20XD_PINNAME_UART0_TX
422
423#define SSD20XD_PINNAME_UART1_RX "uart1_rx"
424#define SSD20XD_PINNAME_UART1_TX "uart1_tx"
425
426#define SSD20XD_UART1_NAMES \
427 SSD20XD_PINNAME_UART1_RX, \
428 SSD20XD_PINNAME_UART1_TX
429
430#define SSD20XD_OFF_UART0_RX 0x60
431#define SSD20XD_OFF_UART0_TX 0x64
432
433#define SSD20XD_UART0_OFFSETS \
434 SSD20XD_OFF_UART0_RX, \
435 SSD20XD_OFF_UART0_TX
436
437#define SSD20XD_OFF_UART1_RX 0x68
438#define SSD20XD_OFF_UART1_TX 0x6c
439
440#define SSD20XD_UART1_OFFSETS \
441 SSD20XD_OFF_UART1_RX, \
442 SSD20XD_OFF_UART1_TX
443
444/*
445 * ssd20x has the same pin names but different ordering
446 * of the registers that control the gpio.
447 */
448#define SSD20XD_OFF_SD_D0 0x140
449#define SSD20XD_OFF_SD_D1 0x144
450#define SSD20XD_OFF_SD_D2 0x148
451#define SSD20XD_OFF_SD_D3 0x14c
452#define SSD20XD_OFF_SD_CMD 0x150
453#define SSD20XD_OFF_SD_CLK 0x154
454
455#define SSD20XD_SD_OFFSETS SSD20XD_OFF_SD_CLK, \
456 SSD20XD_OFF_SD_CMD, \
457 SSD20XD_OFF_SD_D0, \
458 SSD20XD_OFF_SD_D1, \
459 SSD20XD_OFF_SD_D2, \
460 SSD20XD_OFF_SD_D3
461
462static const char * const ssd20xd_names[] = {
463 FUART_NAMES,
464 SD_NAMES,
465 SSD20XD_UART0_NAMES,
466 SSD20XD_UART1_NAMES,
467 SSD20XD_TTL_PINNAMES,
468 SSD20XD_GPIO_NAMES,
469};
470
471static const unsigned int ssd20xd_offsets[] = {
472 FUART_OFFSETS,
473 SSD20XD_SD_OFFSETS,
474 SSD20XD_UART0_OFFSETS,
475 SSD20XD_UART1_OFFSETS,
476 SSD20XD_TTL_OFFSETS,
477 SSD20XD_GPIO_OFFSETS,
478};
479
480MSC313_GPIO_CHIPDATA(ssd20xd);
481#endif
482
483struct msc313_gpio {
484 void __iomem *base;
485 const struct msc313_gpio_data *gpio_data;
486 u8 *saved;
487};
488
489static void msc313_gpio_set(struct gpio_chip *chip, unsigned int offset, int value)
490{
491 struct msc313_gpio *gpio = gpiochip_get_data(chip);
492 u8 gpioreg = readb_relaxed(gpio->base + gpio->gpio_data->offsets[offset]);
493
494 if (value)
495 gpioreg |= MSC313_GPIO_OUT;
496 else
497 gpioreg &= ~MSC313_GPIO_OUT;
498
499 writeb_relaxed(gpioreg, gpio->base + gpio->gpio_data->offsets[offset]);
500}
501
502static int msc313_gpio_get(struct gpio_chip *chip, unsigned int offset)
503{
504 struct msc313_gpio *gpio = gpiochip_get_data(chip);
505
506 return readb_relaxed(gpio->base + gpio->gpio_data->offsets[offset]) & MSC313_GPIO_IN;
507}
508
509static int msc313_gpio_direction_input(struct gpio_chip *chip, unsigned int offset)
510{
511 struct msc313_gpio *gpio = gpiochip_get_data(chip);
512 u8 gpioreg = readb_relaxed(gpio->base + gpio->gpio_data->offsets[offset]);
513
514 gpioreg |= MSC313_GPIO_OEN;
515 writeb_relaxed(gpioreg, gpio->base + gpio->gpio_data->offsets[offset]);
516
517 return 0;
518}
519
520static int msc313_gpio_direction_output(struct gpio_chip *chip, unsigned int offset, int value)
521{
522 struct msc313_gpio *gpio = gpiochip_get_data(chip);
523 u8 gpioreg = readb_relaxed(gpio->base + gpio->gpio_data->offsets[offset]);
524
525 gpioreg &= ~MSC313_GPIO_OEN;
526 if (value)
527 gpioreg |= MSC313_GPIO_OUT;
528 else
529 gpioreg &= ~MSC313_GPIO_OUT;
530 writeb_relaxed(gpioreg, gpio->base + gpio->gpio_data->offsets[offset]);
531
532 return 0;
533}
534
535/*
536 * The interrupt handling happens in the parent interrupt controller,
537 * we don't do anything here.
538 */
539static struct irq_chip msc313_gpio_irqchip = {
540 .name = "GPIO",
541 .irq_eoi = irq_chip_eoi_parent,
542 .irq_mask = irq_chip_mask_parent,
543 .irq_unmask = irq_chip_unmask_parent,
544 .irq_set_type = irq_chip_set_type_parent,
545 .irq_set_affinity = irq_chip_set_affinity_parent,
546};
547
548/*
549 * The parent interrupt controller needs the GIC interrupt type set to GIC_SPI
550 * so we need to provide the fwspec. Essentially gpiochip_populate_parent_fwspec_twocell
551 * that puts GIC_SPI into the first cell.
552 */
553static int msc313_gpio_populate_parent_fwspec(struct gpio_chip *gc,
554 union gpio_irq_fwspec *gfwspec,
555 unsigned int parent_hwirq,
556 unsigned int parent_type)
557{
558 struct irq_fwspec *fwspec = &gfwspec->fwspec;
559
560 fwspec->fwnode = gc->irq.parent_domain->fwnode;
561 fwspec->param_count = 3;
562 fwspec->param[0] = GIC_SPI;
563 fwspec->param[1] = parent_hwirq;
564 fwspec->param[2] = parent_type;
565
566 return 0;
567}
568
569static int msc313e_gpio_child_to_parent_hwirq(struct gpio_chip *chip,
570 unsigned int child,
571 unsigned int child_type,
572 unsigned int *parent,
573 unsigned int *parent_type)
574{
575 struct msc313_gpio *priv = gpiochip_get_data(chip);
576 unsigned int offset = priv->gpio_data->offsets[child];
577
578 /*
579 * only the spi0 pins have interrupts on the parent
580 * on all of the known chips and so far they are all
581 * mapped to the same place
582 */
583 if (offset >= OFF_SPI0_CZ && offset <= OFF_SPI0_DO) {
584 *parent_type = child_type;
585 *parent = ((offset - OFF_SPI0_CZ) >> 2) + 28;
586 return 0;
587 }
588
589 return -EINVAL;
590}
591
592static int msc313_gpio_probe(struct platform_device *pdev)
593{
594 const struct msc313_gpio_data *match_data;
595 struct msc313_gpio *gpio;
596 struct gpio_chip *gpiochip;
597 struct gpio_irq_chip *gpioirqchip;
598 struct irq_domain *parent_domain;
599 struct device_node *parent_node;
600 struct device *dev = &pdev->dev;
601
602 match_data = of_device_get_match_data(dev);
603 if (!match_data)
604 return -EINVAL;
605
606 parent_node = of_irq_find_parent(dev->of_node);
607 if (!parent_node)
608 return -ENODEV;
609
610 parent_domain = irq_find_host(parent_node);
611 if (!parent_domain)
612 return -ENODEV;
613
614 gpio = devm_kzalloc(dev, sizeof(*gpio), GFP_KERNEL);
615 if (!gpio)
616 return -ENOMEM;
617
618 gpio->gpio_data = match_data;
619
620 gpio->saved = devm_kcalloc(dev, gpio->gpio_data->num, sizeof(*gpio->saved), GFP_KERNEL);
621 if (!gpio->saved)
622 return -ENOMEM;
623
624 gpio->base = devm_platform_ioremap_resource(pdev, 0);
625 if (IS_ERR(gpio->base))
626 return PTR_ERR(gpio->base);
627
628 platform_set_drvdata(pdev, gpio);
629
630 gpiochip = devm_kzalloc(dev, sizeof(*gpiochip), GFP_KERNEL);
631 if (!gpiochip)
632 return -ENOMEM;
633
634 gpiochip->label = DRIVER_NAME;
635 gpiochip->parent = dev;
636 gpiochip->request = gpiochip_generic_request;
637 gpiochip->free = gpiochip_generic_free;
638 gpiochip->direction_input = msc313_gpio_direction_input;
639 gpiochip->direction_output = msc313_gpio_direction_output;
640 gpiochip->get = msc313_gpio_get;
641 gpiochip->set = msc313_gpio_set;
642 gpiochip->base = -1;
643 gpiochip->ngpio = gpio->gpio_data->num;
644 gpiochip->names = gpio->gpio_data->names;
645
646 gpioirqchip = &gpiochip->irq;
647 gpioirqchip->chip = &msc313_gpio_irqchip;
648 gpioirqchip->fwnode = of_node_to_fwnode(dev->of_node);
649 gpioirqchip->parent_domain = parent_domain;
650 gpioirqchip->child_to_parent_hwirq = msc313e_gpio_child_to_parent_hwirq;
651 gpioirqchip->populate_parent_alloc_arg = msc313_gpio_populate_parent_fwspec;
652 gpioirqchip->handler = handle_bad_irq;
653 gpioirqchip->default_type = IRQ_TYPE_NONE;
654
655 return devm_gpiochip_add_data(dev, gpiochip, gpio);
656}
657
658static int msc313_gpio_remove(struct platform_device *pdev)
659{
660 return 0;
661}
662
663static const struct of_device_id msc313_gpio_of_match[] = {
664#ifdef CONFIG_MACH_INFINITY
665 {
666 .compatible = "mstar,msc313-gpio",
667 .data = &msc313_data,
668 },
669 {
670 .compatible = "sstar,ssd20xd-gpio",
671 .data = &ssd20xd_data,
672 },
673#endif
674 { }
675};
676
677/*
678 * The GPIO controller loses the state of the registers when the
679 * SoC goes into suspend to memory mode so we need to save some
680 * of the register bits before suspending and put it back when resuming
681 */
682static int __maybe_unused msc313_gpio_suspend(struct device *dev)
683{
684 struct msc313_gpio *gpio = dev_get_drvdata(dev);
685 int i;
686
687 for (i = 0; i < gpio->gpio_data->num; i++)
688 gpio->saved[i] = readb_relaxed(gpio->base + gpio->gpio_data->offsets[i]) & MSC313_GPIO_BITSTOSAVE;
689
690 return 0;
691}
692
693static int __maybe_unused msc313_gpio_resume(struct device *dev)
694{
695 struct msc313_gpio *gpio = dev_get_drvdata(dev);
696 int i;
697
698 for (i = 0; i < gpio->gpio_data->num; i++)
699 writeb_relaxed(gpio->saved[i], gpio->base + gpio->gpio_data->offsets[i]);
700
701 return 0;
702}
703
704static SIMPLE_DEV_PM_OPS(msc313_gpio_ops, msc313_gpio_suspend, msc313_gpio_resume);
705
706static struct platform_driver msc313_gpio_driver = {
707 .driver = {
708 .name = DRIVER_NAME,
709 .of_match_table = msc313_gpio_of_match,
710 .pm = &msc313_gpio_ops,
711 },
712 .probe = msc313_gpio_probe,
713 .remove = msc313_gpio_remove,
714};
715builtin_platform_driver(msc313_gpio_driver);