1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Combined GPIO and pin controller support for Renesas RZ/A1 (r7s72100) SoC
4 *
5 * Copyright (C) 2017 Jacopo Mondi
6 */
7
8 /*
9 * This pin controller/gpio combined driver supports Renesas devices of RZ/A1
10 * family.
11 * This includes SoCs which are sub- or super- sets of this particular line,
12 * as RZ/A1H (r7s721000), RZ/A1M (r7s721010) and RZ/A1L (r7s721020).
13 */
14
15 #include <linux/bitops.h>
16 #include <linux/err.h>
17 #include <linux/gpio/driver.h>
18 #include <linux/init.h>
19 #include <linux/ioport.h>
20 #include <linux/module.h>
21 #include <linux/of.h>
22 #include <linux/of_address.h>
23 #include <linux/of_device.h>
24 #include <linux/pinctrl/pinconf-generic.h>
25 #include <linux/pinctrl/pinctrl.h>
26 #include <linux/pinctrl/pinmux.h>
27 #include <linux/slab.h>
28
29 #include "core.h"
30 #include "devicetree.h"
31 #include "pinconf.h"
32 #include "pinmux.h"
33
34 #define DRIVER_NAME "pinctrl-rza1"
35
36 #define RZA1_P_REG 0x0000
37 #define RZA1_PPR_REG 0x0200
38 #define RZA1_PM_REG 0x0300
39 #define RZA1_PMC_REG 0x0400
40 #define RZA1_PFC_REG 0x0500
41 #define RZA1_PFCE_REG 0x0600
42 #define RZA1_PFCEA_REG 0x0a00
43 #define RZA1_PIBC_REG 0x4000
44 #define RZA1_PBDC_REG 0x4100
45 #define RZA1_PIPC_REG 0x4200
46
47 #define RZA1_ADDR(mem, reg, port) ((mem) + (reg) + ((port) * 4))
48
49 #define RZA1_NPORTS 12
50 #define RZA1_PINS_PER_PORT 16
51 #define RZA1_NPINS (RZA1_PINS_PER_PORT * RZA1_NPORTS)
52 #define RZA1_PIN_ID_TO_PORT(id) ((id) / RZA1_PINS_PER_PORT)
53 #define RZA1_PIN_ID_TO_PIN(id) ((id) % RZA1_PINS_PER_PORT)
54
55 /*
56 * Use 16 lower bits [15:0] for pin identifier
57 * Use 16 higher bits [31:16] for pin mux function
58 */
59 #define MUX_PIN_ID_MASK GENMASK(15, 0)
60 #define MUX_FUNC_MASK GENMASK(31, 16)
61
62 #define MUX_FUNC_OFFS 16
63 #define MUX_FUNC(pinconf) \
64 ((pinconf & MUX_FUNC_MASK) >> MUX_FUNC_OFFS)
65 #define MUX_FUNC_PFC_MASK BIT(0)
66 #define MUX_FUNC_PFCE_MASK BIT(1)
67 #define MUX_FUNC_PFCEA_MASK BIT(2)
68
69 /* Pin mux flags */
70 #define MUX_FLAGS_BIDIR BIT(0)
71 #define MUX_FLAGS_SWIO_INPUT BIT(1)
72 #define MUX_FLAGS_SWIO_OUTPUT BIT(2)
73
74 /* ----------------------------------------------------------------------------
75 * RZ/A1 pinmux flags
76 */
77
78 /**
79 * rza1_bidir_pin - describe a single pin that needs bidir flag applied.
80 */
81 struct rza1_bidir_pin {
82 u8 pin: 4;
83 u8 func: 4;
84 };
85
86 /**
87 * rza1_bidir_entry - describe a list of pins that needs bidir flag applied.
88 * Each struct rza1_bidir_entry describes a port.
89 */
90 struct rza1_bidir_entry {
91 const unsigned int npins;
92 const struct rza1_bidir_pin *pins;
93 };
94
95 /**
96 * rza1_swio_pin - describe a single pin that needs bidir flag applied.
97 */
98 struct rza1_swio_pin {
99 u16 pin: 4;
100 u16 port: 4;
101 u16 func: 4;
102 u16 input: 1;
103 };
104
105 /**
106 * rza1_swio_entry - describe a list of pins that needs swio flag applied
107 */
108 struct rza1_swio_entry {
109 const unsigned int npins;
110 const struct rza1_swio_pin *pins;
111 };
112
113 /**
114 * rza1_pinmux_conf - group together bidir and swio pinmux flag tables
115 */
116 struct rza1_pinmux_conf {
117 const struct rza1_bidir_entry *bidir_entries;
118 const struct rza1_swio_entry *swio_entries;
119 };
120
121 /* ----------------------------------------------------------------------------
122 * RZ/A1H (r7s72100) pinmux flags
123 */
124
125 static const struct rza1_bidir_pin rza1h_bidir_pins_p1[] = {
126 { .pin = 0, .func = 1 },
127 { .pin = 1, .func = 1 },
128 { .pin = 2, .func = 1 },
129 { .pin = 3, .func = 1 },
130 { .pin = 4, .func = 1 },
131 { .pin = 5, .func = 1 },
132 { .pin = 6, .func = 1 },
133 { .pin = 7, .func = 1 },
134 };
135
136 static const struct rza1_bidir_pin rza1h_bidir_pins_p2[] = {
137 { .pin = 0, .func = 1 },
138 { .pin = 1, .func = 1 },
139 { .pin = 2, .func = 1 },
140 { .pin = 3, .func = 1 },
141 { .pin = 4, .func = 1 },
142 { .pin = 0, .func = 4 },
143 { .pin = 1, .func = 4 },
144 { .pin = 2, .func = 4 },
145 { .pin = 3, .func = 4 },
146 { .pin = 5, .func = 1 },
147 { .pin = 6, .func = 1 },
148 { .pin = 7, .func = 1 },
149 { .pin = 8, .func = 1 },
150 { .pin = 9, .func = 1 },
151 { .pin = 10, .func = 1 },
152 { .pin = 11, .func = 1 },
153 { .pin = 12, .func = 1 },
154 { .pin = 13, .func = 1 },
155 { .pin = 14, .func = 1 },
156 { .pin = 15, .func = 1 },
157 { .pin = 12, .func = 4 },
158 { .pin = 13, .func = 4 },
159 { .pin = 14, .func = 4 },
160 { .pin = 15, .func = 4 },
161 };
162
163 static const struct rza1_bidir_pin rza1h_bidir_pins_p3[] = {
164 { .pin = 3, .func = 2 },
165 { .pin = 10, .func = 7 },
166 { .pin = 11, .func = 7 },
167 { .pin = 13, .func = 7 },
168 { .pin = 14, .func = 7 },
169 { .pin = 15, .func = 7 },
170 { .pin = 10, .func = 8 },
171 { .pin = 11, .func = 8 },
172 { .pin = 13, .func = 8 },
173 { .pin = 14, .func = 8 },
174 { .pin = 15, .func = 8 },
175 };
176
177 static const struct rza1_bidir_pin rza1h_bidir_pins_p4[] = {
178 { .pin = 0, .func = 8 },
179 { .pin = 1, .func = 8 },
180 { .pin = 2, .func = 8 },
181 { .pin = 3, .func = 8 },
182 { .pin = 10, .func = 3 },
183 { .pin = 11, .func = 3 },
184 { .pin = 13, .func = 3 },
185 { .pin = 14, .func = 3 },
186 { .pin = 15, .func = 3 },
187 { .pin = 10, .func = 4 },
188 { .pin = 11, .func = 4 },
189 { .pin = 13, .func = 4 },
190 { .pin = 14, .func = 4 },
191 { .pin = 15, .func = 4 },
192 { .pin = 12, .func = 5 },
193 { .pin = 13, .func = 5 },
194 { .pin = 14, .func = 5 },
195 { .pin = 15, .func = 5 },
196 };
197
198 static const struct rza1_bidir_pin rza1h_bidir_pins_p6[] = {
199 { .pin = 0, .func = 1 },
200 { .pin = 1, .func = 1 },
201 { .pin = 2, .func = 1 },
202 { .pin = 3, .func = 1 },
203 { .pin = 4, .func = 1 },
204 { .pin = 5, .func = 1 },
205 { .pin = 6, .func = 1 },
206 { .pin = 7, .func = 1 },
207 { .pin = 8, .func = 1 },
208 { .pin = 9, .func = 1 },
209 { .pin = 10, .func = 1 },
210 { .pin = 11, .func = 1 },
211 { .pin = 12, .func = 1 },
212 { .pin = 13, .func = 1 },
213 { .pin = 14, .func = 1 },
214 { .pin = 15, .func = 1 },
215 };
216
217 static const struct rza1_bidir_pin rza1h_bidir_pins_p7[] = {
218 { .pin = 13, .func = 3 },
219 };
220
221 static const struct rza1_bidir_pin rza1h_bidir_pins_p8[] = {
222 { .pin = 8, .func = 3 },
223 { .pin = 9, .func = 3 },
224 { .pin = 10, .func = 3 },
225 { .pin = 11, .func = 3 },
226 { .pin = 14, .func = 2 },
227 { .pin = 15, .func = 2 },
228 { .pin = 14, .func = 3 },
229 { .pin = 15, .func = 3 },
230 };
231
232 static const struct rza1_bidir_pin rza1h_bidir_pins_p9[] = {
233 { .pin = 0, .func = 2 },
234 { .pin = 1, .func = 2 },
235 { .pin = 4, .func = 2 },
236 { .pin = 5, .func = 2 },
237 { .pin = 6, .func = 2 },
238 { .pin = 7, .func = 2 },
239 };
240
241 static const struct rza1_bidir_pin rza1h_bidir_pins_p11[] = {
242 { .pin = 6, .func = 2 },
243 { .pin = 7, .func = 2 },
244 { .pin = 9, .func = 2 },
245 { .pin = 6, .func = 4 },
246 { .pin = 7, .func = 4 },
247 { .pin = 9, .func = 4 },
248 { .pin = 10, .func = 2 },
249 { .pin = 11, .func = 2 },
250 { .pin = 10, .func = 4 },
251 { .pin = 11, .func = 4 },
252 { .pin = 12, .func = 4 },
253 { .pin = 13, .func = 4 },
254 { .pin = 14, .func = 4 },
255 { .pin = 15, .func = 4 },
256 };
257
258 static const struct rza1_swio_pin rza1h_swio_pins[] = {
259 { .port = 2, .pin = 7, .func = 4, .input = 0 },
260 { .port = 2, .pin = 11, .func = 4, .input = 0 },
261 { .port = 3, .pin = 7, .func = 3, .input = 0 },
262 { .port = 3, .pin = 7, .func = 8, .input = 0 },
263 { .port = 4, .pin = 7, .func = 5, .input = 0 },
264 { .port = 4, .pin = 7, .func = 11, .input = 0 },
265 { .port = 4, .pin = 15, .func = 6, .input = 0 },
266 { .port = 5, .pin = 0, .func = 1, .input = 1 },
267 { .port = 5, .pin = 1, .func = 1, .input = 1 },
268 { .port = 5, .pin = 2, .func = 1, .input = 1 },
269 { .port = 5, .pin = 3, .func = 1, .input = 1 },
270 { .port = 5, .pin = 4, .func = 1, .input = 1 },
271 { .port = 5, .pin = 5, .func = 1, .input = 1 },
272 { .port = 5, .pin = 6, .func = 1, .input = 1 },
273 { .port = 5, .pin = 7, .func = 1, .input = 1 },
274 { .port = 7, .pin = 4, .func = 6, .input = 0 },
275 { .port = 7, .pin = 11, .func = 2, .input = 0 },
276 { .port = 8, .pin = 10, .func = 8, .input = 0 },
277 { .port = 10, .pin = 15, .func = 2, .input = 0 },
278 };
279
280 static const struct rza1_bidir_entry rza1h_bidir_entries[RZA1_NPORTS] = {
281 [1] = { ARRAY_SIZE(rza1h_bidir_pins_p1), rza1h_bidir_pins_p1 },
282 [2] = { ARRAY_SIZE(rza1h_bidir_pins_p2), rza1h_bidir_pins_p2 },
283 [3] = { ARRAY_SIZE(rza1h_bidir_pins_p3), rza1h_bidir_pins_p3 },
284 [4] = { ARRAY_SIZE(rza1h_bidir_pins_p4), rza1h_bidir_pins_p4 },
285 [6] = { ARRAY_SIZE(rza1h_bidir_pins_p6), rza1h_bidir_pins_p6 },
286 [7] = { ARRAY_SIZE(rza1h_bidir_pins_p7), rza1h_bidir_pins_p7 },
287 [8] = { ARRAY_SIZE(rza1h_bidir_pins_p8), rza1h_bidir_pins_p8 },
288 [9] = { ARRAY_SIZE(rza1h_bidir_pins_p9), rza1h_bidir_pins_p9 },
289 [11] = { ARRAY_SIZE(rza1h_bidir_pins_p11), rza1h_bidir_pins_p11 },
290 };
291
292 static const struct rza1_swio_entry rza1h_swio_entries[] = {
293 [0] = { ARRAY_SIZE(rza1h_swio_pins), rza1h_swio_pins },
294 };
295
296 /* RZ/A1H (r7s72100x) pinmux flags table */
297 static const struct rza1_pinmux_conf rza1h_pmx_conf = {
298 .bidir_entries = rza1h_bidir_entries,
299 .swio_entries = rza1h_swio_entries,
300 };
301
302 /* ----------------------------------------------------------------------------
303 * RZ/A1L (r7s72102) pinmux flags
304 */
305
306 static const struct rza1_bidir_pin rza1l_bidir_pins_p1[] = {
307 { .pin = 0, .func = 1 },
308 { .pin = 1, .func = 1 },
309 { .pin = 2, .func = 1 },
310 { .pin = 3, .func = 1 },
311 { .pin = 4, .func = 1 },
312 { .pin = 5, .func = 1 },
313 { .pin = 6, .func = 1 },
314 { .pin = 7, .func = 1 },
315 };
316
317 static const struct rza1_bidir_pin rza1l_bidir_pins_p3[] = {
318 { .pin = 0, .func = 2 },
319 { .pin = 1, .func = 2 },
320 { .pin = 2, .func = 2 },
321 { .pin = 4, .func = 2 },
322 { .pin = 5, .func = 2 },
323 { .pin = 10, .func = 2 },
324 { .pin = 11, .func = 2 },
325 { .pin = 12, .func = 2 },
326 { .pin = 13, .func = 2 },
327 };
328
329 static const struct rza1_bidir_pin rza1l_bidir_pins_p4[] = {
330 { .pin = 1, .func = 4 },
331 { .pin = 2, .func = 2 },
332 { .pin = 3, .func = 2 },
333 { .pin = 6, .func = 2 },
334 { .pin = 7, .func = 2 },
335 };
336
337 static const struct rza1_bidir_pin rza1l_bidir_pins_p5[] = {
338 { .pin = 0, .func = 1 },
339 { .pin = 1, .func = 1 },
340 { .pin = 2, .func = 1 },
341 { .pin = 3, .func = 1 },
342 { .pin = 4, .func = 1 },
343 { .pin = 5, .func = 1 },
344 { .pin = 6, .func = 1 },
345 { .pin = 7, .func = 1 },
346 { .pin = 8, .func = 1 },
347 { .pin = 9, .func = 1 },
348 { .pin = 10, .func = 1 },
349 { .pin = 11, .func = 1 },
350 { .pin = 12, .func = 1 },
351 { .pin = 13, .func = 1 },
352 { .pin = 14, .func = 1 },
353 { .pin = 15, .func = 1 },
354 { .pin = 0, .func = 2 },
355 { .pin = 1, .func = 2 },
356 { .pin = 2, .func = 2 },
357 { .pin = 3, .func = 2 },
358 };
359
360 static const struct rza1_bidir_pin rza1l_bidir_pins_p6[] = {
361 { .pin = 0, .func = 1 },
362 { .pin = 1, .func = 1 },
363 { .pin = 2, .func = 1 },
364 { .pin = 3, .func = 1 },
365 { .pin = 4, .func = 1 },
366 { .pin = 5, .func = 1 },
367 { .pin = 6, .func = 1 },
368 { .pin = 7, .func = 1 },
369 { .pin = 8, .func = 1 },
370 { .pin = 9, .func = 1 },
371 { .pin = 10, .func = 1 },
372 { .pin = 11, .func = 1 },
373 { .pin = 12, .func = 1 },
374 { .pin = 13, .func = 1 },
375 { .pin = 14, .func = 1 },
376 { .pin = 15, .func = 1 },
377 };
378
379 static const struct rza1_bidir_pin rza1l_bidir_pins_p7[] = {
380 { .pin = 2, .func = 2 },
381 { .pin = 3, .func = 2 },
382 { .pin = 5, .func = 2 },
383 { .pin = 6, .func = 2 },
384 { .pin = 7, .func = 2 },
385 { .pin = 2, .func = 3 },
386 { .pin = 3, .func = 3 },
387 { .pin = 5, .func = 3 },
388 { .pin = 6, .func = 3 },
389 { .pin = 7, .func = 3 },
390 };
391
392 static const struct rza1_bidir_pin rza1l_bidir_pins_p9[] = {
393 { .pin = 1, .func = 2 },
394 { .pin = 0, .func = 3 },
395 { .pin = 1, .func = 3 },
396 { .pin = 3, .func = 3 },
397 { .pin = 4, .func = 3 },
398 { .pin = 5, .func = 3 },
399 };
400
401 static const struct rza1_swio_pin rza1l_swio_pins[] = {
402 { .port = 2, .pin = 8, .func = 2, .input = 0 },
403 { .port = 5, .pin = 6, .func = 3, .input = 0 },
404 { .port = 6, .pin = 6, .func = 3, .input = 0 },
405 { .port = 6, .pin = 10, .func = 3, .input = 0 },
406 { .port = 7, .pin = 10, .func = 2, .input = 0 },
407 { .port = 8, .pin = 2, .func = 3, .input = 0 },
408 };
409
410 static const struct rza1_bidir_entry rza1l_bidir_entries[RZA1_NPORTS] = {
411 [1] = { ARRAY_SIZE(rza1l_bidir_pins_p1), rza1l_bidir_pins_p1 },
412 [3] = { ARRAY_SIZE(rza1l_bidir_pins_p3), rza1l_bidir_pins_p3 },
413 [4] = { ARRAY_SIZE(rza1l_bidir_pins_p4), rza1l_bidir_pins_p4 },
414 [5] = { ARRAY_SIZE(rza1l_bidir_pins_p4), rza1l_bidir_pins_p5 },
415 [6] = { ARRAY_SIZE(rza1l_bidir_pins_p6), rza1l_bidir_pins_p6 },
416 [7] = { ARRAY_SIZE(rza1l_bidir_pins_p7), rza1l_bidir_pins_p7 },
417 [9] = { ARRAY_SIZE(rza1l_bidir_pins_p9), rza1l_bidir_pins_p9 },
418 };
419
420 static const struct rza1_swio_entry rza1l_swio_entries[] = {
421 [0] = { ARRAY_SIZE(rza1h_swio_pins), rza1h_swio_pins },
422 };
423
424 /* RZ/A1L (r7s72102x) pinmux flags table */
425 static const struct rza1_pinmux_conf rza1l_pmx_conf = {
426 .bidir_entries = rza1l_bidir_entries,
427 .swio_entries = rza1l_swio_entries,
428 };
429
430 /* ----------------------------------------------------------------------------
431 * RZ/A1 types
432 */
433 /**
434 * rza1_mux_conf - describes a pin multiplexing operation
435 *
436 * @id: the pin identifier from 0 to RZA1_NPINS
437 * @port: the port where pin sits on
438 * @pin: pin id
439 * @mux_func: alternate function id number
440 * @mux_flags: alternate function flags
441 * @value: output value to set the pin to
442 */
443 struct rza1_mux_conf {
444 u16 id;
445 u8 port;
446 u8 pin;
447 u8 mux_func;
448 u8 mux_flags;
449 u8 value;
450 };
451
452 /**
453 * rza1_port - describes a pin port
454 *
455 * This is mostly useful to lock register writes per-bank and not globally.
456 *
457 * @lock: protect access to HW registers
458 * @id: port number
459 * @base: logical address base
460 * @pins: pins sitting on this port
461 */
462 struct rza1_port {
463 spinlock_t lock;
464 unsigned int id;
465 void __iomem *base;
466 struct pinctrl_pin_desc *pins;
467 };
468
469 /**
470 * rza1_pinctrl - RZ pincontroller device
471 *
472 * @dev: parent device structure
473 * @mutex: protect [pinctrl|pinmux]_generic functions
474 * @base: logical address base
475 * @nports: number of pin controller ports
476 * @ports: pin controller banks
477 * @pins: pin array for pinctrl core
478 * @desc: pincontroller desc for pinctrl core
479 * @pctl: pinctrl device
480 * @data: device specific data
481 */
482 struct rza1_pinctrl {
483 struct device *dev;
484
485 struct mutex mutex;
486
487 void __iomem *base;
488
489 unsigned int nport;
490 struct rza1_port *ports;
491
492 struct pinctrl_pin_desc *pins;
493 struct pinctrl_desc desc;
494 struct pinctrl_dev *pctl;
495
496 const void *data;
497 };
498
499 /* ----------------------------------------------------------------------------
500 * RZ/A1 pinmux flags
501 */
rza1_pinmux_get_bidir(unsigned int port,unsigned int pin,unsigned int func,const struct rza1_bidir_entry * table)502 static inline bool rza1_pinmux_get_bidir(unsigned int port,
503 unsigned int pin,
504 unsigned int func,
505 const struct rza1_bidir_entry *table)
506 {
507 const struct rza1_bidir_entry *entry = &table[port];
508 const struct rza1_bidir_pin *bidir_pin;
509 unsigned int i;
510
511 for (i = 0; i < entry->npins; ++i) {
512 bidir_pin = &entry->pins[i];
513 if (bidir_pin->pin == pin && bidir_pin->func == func)
514 return true;
515 }
516
517 return false;
518 }
519
rza1_pinmux_get_swio(unsigned int port,unsigned int pin,unsigned int func,const struct rza1_swio_entry * table)520 static inline int rza1_pinmux_get_swio(unsigned int port,
521 unsigned int pin,
522 unsigned int func,
523 const struct rza1_swio_entry *table)
524 {
525 const struct rza1_swio_pin *swio_pin;
526 unsigned int i;
527
528
529 for (i = 0; i < table->npins; ++i) {
530 swio_pin = &table->pins[i];
531 if (swio_pin->port == port && swio_pin->pin == pin &&
532 swio_pin->func == func)
533 return swio_pin->input;
534 }
535
536 return -ENOENT;
537 }
538
539 /**
540 * rza1_pinmux_get_flags() - return pinmux flags associated to a pin
541 */
rza1_pinmux_get_flags(unsigned int port,unsigned int pin,unsigned int func,struct rza1_pinctrl * rza1_pctl)542 static unsigned int rza1_pinmux_get_flags(unsigned int port, unsigned int pin,
543 unsigned int func,
544 struct rza1_pinctrl *rza1_pctl)
545
546 {
547 const struct rza1_pinmux_conf *pmx_conf = rza1_pctl->data;
548 const struct rza1_bidir_entry *bidir_entries = pmx_conf->bidir_entries;
549 const struct rza1_swio_entry *swio_entries = pmx_conf->swio_entries;
550 unsigned int pmx_flags = 0;
551 int ret;
552
553 if (rza1_pinmux_get_bidir(port, pin, func, bidir_entries))
554 pmx_flags |= MUX_FLAGS_BIDIR;
555
556 ret = rza1_pinmux_get_swio(port, pin, func, swio_entries);
557 if (ret == 0)
558 pmx_flags |= MUX_FLAGS_SWIO_OUTPUT;
559 else if (ret > 0)
560 pmx_flags |= MUX_FLAGS_SWIO_INPUT;
561
562 return pmx_flags;
563 }
564
565 /* ----------------------------------------------------------------------------
566 * RZ/A1 SoC operations
567 */
568
569 /**
570 * rza1_set_bit() - un-locked set/clear a single bit in pin configuration
571 * registers
572 */
rza1_set_bit(struct rza1_port * port,unsigned int reg,unsigned int bit,bool set)573 static inline void rza1_set_bit(struct rza1_port *port, unsigned int reg,
574 unsigned int bit, bool set)
575 {
576 void __iomem *mem = RZA1_ADDR(port->base, reg, port->id);
577 u16 val = ioread16(mem);
578
579 if (set)
580 val |= BIT(bit);
581 else
582 val &= ~BIT(bit);
583
584 iowrite16(val, mem);
585 }
586
rza1_get_bit(struct rza1_port * port,unsigned int reg,unsigned int bit)587 static inline unsigned int rza1_get_bit(struct rza1_port *port,
588 unsigned int reg, unsigned int bit)
589 {
590 void __iomem *mem = RZA1_ADDR(port->base, reg, port->id);
591
592 return ioread16(mem) & BIT(bit);
593 }
594
595 /**
596 * rza1_pin_reset() - reset a pin to default initial state
597 *
598 * Reset pin state disabling input buffer and bi-directional control,
599 * and configure it as input port.
600 * Note that pin is now configured with direction as input but with input
601 * buffer disabled. This implies the pin value cannot be read in this state.
602 *
603 * @port: port where pin sits on
604 * @pin: pin offset
605 */
rza1_pin_reset(struct rza1_port * port,unsigned int pin)606 static void rza1_pin_reset(struct rza1_port *port, unsigned int pin)
607 {
608 unsigned long irqflags;
609
610 spin_lock_irqsave(&port->lock, irqflags);
611 rza1_set_bit(port, RZA1_PIBC_REG, pin, 0);
612 rza1_set_bit(port, RZA1_PBDC_REG, pin, 0);
613
614 rza1_set_bit(port, RZA1_PM_REG, pin, 1);
615 rza1_set_bit(port, RZA1_PMC_REG, pin, 0);
616 rza1_set_bit(port, RZA1_PIPC_REG, pin, 0);
617 spin_unlock_irqrestore(&port->lock, irqflags);
618 }
619
rza1_pin_get_direction(struct rza1_port * port,unsigned int pin)620 static inline int rza1_pin_get_direction(struct rza1_port *port,
621 unsigned int pin)
622 {
623 return !!rza1_get_bit(port, RZA1_PM_REG, pin);
624 }
625
626 /**
627 * rza1_pin_set_direction() - set I/O direction on a pin in port mode
628 *
629 * When running in output port mode keep PBDC enabled to allow reading the
630 * pin value from PPR.
631 *
632 * @port: port where pin sits on
633 * @pin: pin offset
634 * @input: input enable/disable flag
635 */
rza1_pin_set_direction(struct rza1_port * port,unsigned int pin,bool input)636 static inline void rza1_pin_set_direction(struct rza1_port *port,
637 unsigned int pin, bool input)
638 {
639 unsigned long irqflags;
640
641 spin_lock_irqsave(&port->lock, irqflags);
642
643 rza1_set_bit(port, RZA1_PIBC_REG, pin, 1);
644 if (input) {
645 rza1_set_bit(port, RZA1_PM_REG, pin, 1);
646 rza1_set_bit(port, RZA1_PBDC_REG, pin, 0);
647 } else {
648 rza1_set_bit(port, RZA1_PM_REG, pin, 0);
649 rza1_set_bit(port, RZA1_PBDC_REG, pin, 1);
650 }
651
652 spin_unlock_irqrestore(&port->lock, irqflags);
653 }
654
rza1_pin_set(struct rza1_port * port,unsigned int pin,unsigned int value)655 static inline void rza1_pin_set(struct rza1_port *port, unsigned int pin,
656 unsigned int value)
657 {
658 unsigned long irqflags;
659
660 spin_lock_irqsave(&port->lock, irqflags);
661 rza1_set_bit(port, RZA1_P_REG, pin, !!value);
662 spin_unlock_irqrestore(&port->lock, irqflags);
663 }
664
rza1_pin_get(struct rza1_port * port,unsigned int pin)665 static inline int rza1_pin_get(struct rza1_port *port, unsigned int pin)
666 {
667 return rza1_get_bit(port, RZA1_PPR_REG, pin);
668 }
669
670 /**
671 * rza1_pin_mux_single() - configure pin multiplexing on a single pin
672 *
673 * @pinctrl: RZ/A1 pin controller device
674 * @mux_conf: pin multiplexing descriptor
675 */
rza1_pin_mux_single(struct rza1_pinctrl * rza1_pctl,struct rza1_mux_conf * mux_conf)676 static int rza1_pin_mux_single(struct rza1_pinctrl *rza1_pctl,
677 struct rza1_mux_conf *mux_conf)
678 {
679 struct rza1_port *port = &rza1_pctl->ports[mux_conf->port];
680 unsigned int pin = mux_conf->pin;
681 u8 mux_func = mux_conf->mux_func;
682 u8 mux_flags = mux_conf->mux_flags;
683 u8 mux_flags_from_table;
684
685 rza1_pin_reset(port, pin);
686
687 /* SWIO pinmux flags coming from DT are high precedence */
688 mux_flags_from_table = rza1_pinmux_get_flags(port->id, pin, mux_func,
689 rza1_pctl);
690 if (mux_flags)
691 mux_flags |= (mux_flags_from_table & MUX_FLAGS_BIDIR);
692 else
693 mux_flags = mux_flags_from_table;
694
695 if (mux_flags & MUX_FLAGS_BIDIR)
696 rza1_set_bit(port, RZA1_PBDC_REG, pin, 1);
697
698 /*
699 * Enable alternate function mode and select it.
700 *
701 * Be careful here: the pin mux sub-nodes in device tree
702 * enumerate alternate functions from 1 to 8;
703 * subtract 1 before using macros to match registers configuration
704 * which expects numbers from 0 to 7 instead.
705 *
706 * ----------------------------------------------------
707 * Alternate mode selection table:
708 *
709 * PMC PFC PFCE PFCAE (mux_func - 1)
710 * 1 0 0 0 0
711 * 1 1 0 0 1
712 * 1 0 1 0 2
713 * 1 1 1 0 3
714 * 1 0 0 1 4
715 * 1 1 0 1 5
716 * 1 0 1 1 6
717 * 1 1 1 1 7
718 * ----------------------------------------------------
719 */
720 mux_func -= 1;
721 rza1_set_bit(port, RZA1_PFC_REG, pin, mux_func & MUX_FUNC_PFC_MASK);
722 rza1_set_bit(port, RZA1_PFCE_REG, pin, mux_func & MUX_FUNC_PFCE_MASK);
723 rza1_set_bit(port, RZA1_PFCEA_REG, pin, mux_func & MUX_FUNC_PFCEA_MASK);
724
725 /*
726 * All alternate functions except a few need PIPCn = 1.
727 * If PIPCn has to stay disabled (SW IO mode), configure PMn according
728 * to I/O direction specified by pin configuration -after- PMC has been
729 * set to one.
730 */
731 if (mux_flags & (MUX_FLAGS_SWIO_INPUT | MUX_FLAGS_SWIO_OUTPUT))
732 rza1_set_bit(port, RZA1_PM_REG, pin,
733 mux_flags & MUX_FLAGS_SWIO_INPUT);
734 else
735 rza1_set_bit(port, RZA1_PIPC_REG, pin, 1);
736
737 rza1_set_bit(port, RZA1_PMC_REG, pin, 1);
738
739 return 0;
740 }
741
742 /* ----------------------------------------------------------------------------
743 * gpio operations
744 */
745
746 /**
747 * rza1_gpio_request() - configure pin in port mode
748 *
749 * Configure a pin as gpio (port mode).
750 * After reset, the pin is in input mode with input buffer disabled.
751 * To use the pin as input or output, set_direction shall be called first
752 *
753 * @chip: gpio chip where the gpio sits on
754 * @gpio: gpio offset
755 */
rza1_gpio_request(struct gpio_chip * chip,unsigned int gpio)756 static int rza1_gpio_request(struct gpio_chip *chip, unsigned int gpio)
757 {
758 struct rza1_port *port = gpiochip_get_data(chip);
759
760 rza1_pin_reset(port, gpio);
761
762 return 0;
763 }
764
765 /**
766 * rza1_gpio_disable_free() - reset a pin
767 *
768 * Surprisingly, disable_free a gpio, is equivalent to request it.
769 * Reset pin to port mode, with input buffer disabled. This overwrites all
770 * port direction settings applied with set_direction
771 *
772 * @chip: gpio chip where the gpio sits on
773 * @gpio: gpio offset
774 */
rza1_gpio_free(struct gpio_chip * chip,unsigned int gpio)775 static void rza1_gpio_free(struct gpio_chip *chip, unsigned int gpio)
776 {
777 struct rza1_port *port = gpiochip_get_data(chip);
778
779 rza1_pin_reset(port, gpio);
780 }
781
rza1_gpio_get_direction(struct gpio_chip * chip,unsigned int gpio)782 static int rza1_gpio_get_direction(struct gpio_chip *chip, unsigned int gpio)
783 {
784 struct rza1_port *port = gpiochip_get_data(chip);
785
786 return rza1_pin_get_direction(port, gpio);
787 }
788
rza1_gpio_direction_input(struct gpio_chip * chip,unsigned int gpio)789 static int rza1_gpio_direction_input(struct gpio_chip *chip,
790 unsigned int gpio)
791 {
792 struct rza1_port *port = gpiochip_get_data(chip);
793
794 rza1_pin_set_direction(port, gpio, true);
795
796 return 0;
797 }
798
rza1_gpio_direction_output(struct gpio_chip * chip,unsigned int gpio,int value)799 static int rza1_gpio_direction_output(struct gpio_chip *chip,
800 unsigned int gpio,
801 int value)
802 {
803 struct rza1_port *port = gpiochip_get_data(chip);
804
805 /* Set value before driving pin direction */
806 rza1_pin_set(port, gpio, value);
807 rza1_pin_set_direction(port, gpio, false);
808
809 return 0;
810 }
811
812 /**
813 * rza1_gpio_get() - read a gpio pin value
814 *
815 * Read gpio pin value through PPR register.
816 * Requires bi-directional mode to work when reading the value of a pin
817 * in output mode
818 *
819 * @chip: gpio chip where the gpio sits on
820 * @gpio: gpio offset
821 */
rza1_gpio_get(struct gpio_chip * chip,unsigned int gpio)822 static int rza1_gpio_get(struct gpio_chip *chip, unsigned int gpio)
823 {
824 struct rza1_port *port = gpiochip_get_data(chip);
825
826 return rza1_pin_get(port, gpio);
827 }
828
rza1_gpio_set(struct gpio_chip * chip,unsigned int gpio,int value)829 static void rza1_gpio_set(struct gpio_chip *chip, unsigned int gpio,
830 int value)
831 {
832 struct rza1_port *port = gpiochip_get_data(chip);
833
834 rza1_pin_set(port, gpio, value);
835 }
836
837 static const struct gpio_chip rza1_gpiochip_template = {
838 .request = rza1_gpio_request,
839 .free = rza1_gpio_free,
840 .get_direction = rza1_gpio_get_direction,
841 .direction_input = rza1_gpio_direction_input,
842 .direction_output = rza1_gpio_direction_output,
843 .get = rza1_gpio_get,
844 .set = rza1_gpio_set,
845 };
846 /* ----------------------------------------------------------------------------
847 * pinctrl operations
848 */
849
850 /**
851 * rza1_dt_node_pin_count() - Count number of pins in a dt node or in all its
852 * children sub-nodes
853 *
854 * @np: device tree node to parse
855 */
rza1_dt_node_pin_count(struct device_node * np)856 static int rza1_dt_node_pin_count(struct device_node *np)
857 {
858 struct device_node *child;
859 struct property *of_pins;
860 unsigned int npins;
861
862 of_pins = of_find_property(np, "pinmux", NULL);
863 if (of_pins)
864 return of_pins->length / sizeof(u32);
865
866 npins = 0;
867 for_each_child_of_node(np, child) {
868 of_pins = of_find_property(child, "pinmux", NULL);
869 if (!of_pins) {
870 of_node_put(child);
871 return -EINVAL;
872 }
873
874 npins += of_pins->length / sizeof(u32);
875 }
876
877 return npins;
878 }
879
880 /**
881 * rza1_parse_pmx_function() - parse a pin mux sub-node
882 *
883 * @rza1_pctl: RZ/A1 pin controller device
884 * @np: of pmx sub-node
885 * @mux_confs: array of pin mux configurations to fill with parsed info
886 * @grpins: array of pin ids to mux
887 */
rza1_parse_pinmux_node(struct rza1_pinctrl * rza1_pctl,struct device_node * np,struct rza1_mux_conf * mux_confs,unsigned int * grpins)888 static int rza1_parse_pinmux_node(struct rza1_pinctrl *rza1_pctl,
889 struct device_node *np,
890 struct rza1_mux_conf *mux_confs,
891 unsigned int *grpins)
892 {
893 struct pinctrl_dev *pctldev = rza1_pctl->pctl;
894 char const *prop_name = "pinmux";
895 unsigned long *pin_configs;
896 unsigned int npin_configs;
897 struct property *of_pins;
898 unsigned int npins;
899 u8 pinmux_flags;
900 unsigned int i;
901 int ret;
902
903 of_pins = of_find_property(np, prop_name, NULL);
904 if (!of_pins) {
905 dev_dbg(rza1_pctl->dev, "Missing %s property\n", prop_name);
906 return -ENOENT;
907 }
908 npins = of_pins->length / sizeof(u32);
909
910 /*
911 * Collect pin configuration properties: they apply to all pins in
912 * this sub-node
913 */
914 ret = pinconf_generic_parse_dt_config(np, pctldev, &pin_configs,
915 &npin_configs);
916 if (ret) {
917 dev_err(rza1_pctl->dev,
918 "Unable to parse pin configuration options for %pOFn\n",
919 np);
920 return ret;
921 }
922
923 /*
924 * Create a mask with pinmux flags from pin configuration;
925 * very few pins (TIOC[0-4][A|B|C|D] require SWIO direction
926 * specified in device tree.
927 */
928 pinmux_flags = 0;
929 for (i = 0; i < npin_configs && pinmux_flags == 0; i++)
930 switch (pinconf_to_config_param(pin_configs[i])) {
931 case PIN_CONFIG_INPUT_ENABLE:
932 pinmux_flags |= MUX_FLAGS_SWIO_INPUT;
933 break;
934 case PIN_CONFIG_OUTPUT:
935 pinmux_flags |= MUX_FLAGS_SWIO_OUTPUT;
936 default:
937 break;
938
939 }
940
941 kfree(pin_configs);
942
943 /* Collect pin positions and their mux settings. */
944 for (i = 0; i < npins; ++i) {
945 u32 of_pinconf;
946 struct rza1_mux_conf *mux_conf = &mux_confs[i];
947
948 ret = of_property_read_u32_index(np, prop_name, i, &of_pinconf);
949 if (ret)
950 return ret;
951
952 mux_conf->id = of_pinconf & MUX_PIN_ID_MASK;
953 mux_conf->port = RZA1_PIN_ID_TO_PORT(mux_conf->id);
954 mux_conf->pin = RZA1_PIN_ID_TO_PIN(mux_conf->id);
955 mux_conf->mux_func = MUX_FUNC(of_pinconf);
956 mux_conf->mux_flags = pinmux_flags;
957
958 if (mux_conf->port >= RZA1_NPORTS ||
959 mux_conf->pin >= RZA1_PINS_PER_PORT) {
960 dev_err(rza1_pctl->dev,
961 "Wrong port %u pin %u for %s property\n",
962 mux_conf->port, mux_conf->pin, prop_name);
963 return -EINVAL;
964 }
965
966 grpins[i] = mux_conf->id;
967 }
968
969 return npins;
970 }
971
972 /**
973 * rza1_dt_node_to_map() - map a pin mux node to a function/group
974 *
975 * Parse and register a pin mux function.
976 *
977 * @pctldev: pin controller device
978 * @np: device tree node to parse
979 * @map: pointer to pin map (output)
980 * @num_maps: number of collected maps (output)
981 */
rza1_dt_node_to_map(struct pinctrl_dev * pctldev,struct device_node * np,struct pinctrl_map ** map,unsigned int * num_maps)982 static int rza1_dt_node_to_map(struct pinctrl_dev *pctldev,
983 struct device_node *np,
984 struct pinctrl_map **map,
985 unsigned int *num_maps)
986 {
987 struct rza1_pinctrl *rza1_pctl = pinctrl_dev_get_drvdata(pctldev);
988 struct rza1_mux_conf *mux_confs, *mux_conf;
989 unsigned int *grpins, *grpin;
990 struct device_node *child;
991 const char *grpname;
992 const char **fngrps;
993 int ret, npins;
994 int gsel, fsel;
995
996 npins = rza1_dt_node_pin_count(np);
997 if (npins < 0) {
998 dev_err(rza1_pctl->dev, "invalid pinmux node structure\n");
999 return -EINVAL;
1000 }
1001
1002 /*
1003 * Functions are made of 1 group only;
1004 * in fact, functions and groups are identical for this pin controller
1005 * except that functions carry an array of per-pin mux configuration
1006 * settings.
1007 */
1008 mux_confs = devm_kcalloc(rza1_pctl->dev, npins, sizeof(*mux_confs),
1009 GFP_KERNEL);
1010 grpins = devm_kcalloc(rza1_pctl->dev, npins, sizeof(*grpins),
1011 GFP_KERNEL);
1012 fngrps = devm_kzalloc(rza1_pctl->dev, sizeof(*fngrps), GFP_KERNEL);
1013
1014 if (!mux_confs || !grpins || !fngrps)
1015 return -ENOMEM;
1016
1017 /*
1018 * Parse the pinmux node.
1019 * If the node does not contain "pinmux" property (-ENOENT)
1020 * that property shall be specified in all its children sub-nodes.
1021 */
1022 mux_conf = &mux_confs[0];
1023 grpin = &grpins[0];
1024
1025 ret = rza1_parse_pinmux_node(rza1_pctl, np, mux_conf, grpin);
1026 if (ret == -ENOENT)
1027 for_each_child_of_node(np, child) {
1028 ret = rza1_parse_pinmux_node(rza1_pctl, child, mux_conf,
1029 grpin);
1030 if (ret < 0) {
1031 of_node_put(child);
1032 return ret;
1033 }
1034
1035 grpin += ret;
1036 mux_conf += ret;
1037 }
1038 else if (ret < 0)
1039 return ret;
1040
1041 /* Register pin group and function name to pinctrl_generic */
1042 grpname = np->name;
1043 fngrps[0] = grpname;
1044
1045 mutex_lock(&rza1_pctl->mutex);
1046 gsel = pinctrl_generic_add_group(pctldev, grpname, grpins, npins,
1047 NULL);
1048 if (gsel < 0) {
1049 mutex_unlock(&rza1_pctl->mutex);
1050 return gsel;
1051 }
1052
1053 fsel = pinmux_generic_add_function(pctldev, grpname, fngrps, 1,
1054 mux_confs);
1055 if (fsel < 0) {
1056 ret = fsel;
1057 goto remove_group;
1058 }
1059
1060 dev_info(rza1_pctl->dev, "Parsed function and group %s with %d pins\n",
1061 grpname, npins);
1062
1063 /* Create map where to retrieve function and mux settings from */
1064 *num_maps = 0;
1065 *map = kzalloc(sizeof(**map), GFP_KERNEL);
1066 if (!*map) {
1067 ret = -ENOMEM;
1068 goto remove_function;
1069 }
1070
1071 (*map)->type = PIN_MAP_TYPE_MUX_GROUP;
1072 (*map)->data.mux.group = np->name;
1073 (*map)->data.mux.function = np->name;
1074 *num_maps = 1;
1075 mutex_unlock(&rza1_pctl->mutex);
1076
1077 return 0;
1078
1079 remove_function:
1080 pinmux_generic_remove_function(pctldev, fsel);
1081
1082 remove_group:
1083 pinctrl_generic_remove_group(pctldev, gsel);
1084 mutex_unlock(&rza1_pctl->mutex);
1085
1086 dev_info(rza1_pctl->dev, "Unable to parse function and group %s\n",
1087 grpname);
1088
1089 return ret;
1090 }
1091
rza1_dt_free_map(struct pinctrl_dev * pctldev,struct pinctrl_map * map,unsigned int num_maps)1092 static void rza1_dt_free_map(struct pinctrl_dev *pctldev,
1093 struct pinctrl_map *map, unsigned int num_maps)
1094 {
1095 kfree(map);
1096 }
1097
1098 static const struct pinctrl_ops rza1_pinctrl_ops = {
1099 .get_groups_count = pinctrl_generic_get_group_count,
1100 .get_group_name = pinctrl_generic_get_group_name,
1101 .get_group_pins = pinctrl_generic_get_group_pins,
1102 .dt_node_to_map = rza1_dt_node_to_map,
1103 .dt_free_map = rza1_dt_free_map,
1104 };
1105
1106 /* ----------------------------------------------------------------------------
1107 * pinmux operations
1108 */
1109
1110 /**
1111 * rza1_set_mux() - retrieve pins from a group and apply their mux settings
1112 *
1113 * @pctldev: pin controller device
1114 * @selector: function selector
1115 * @group: group selector
1116 */
rza1_set_mux(struct pinctrl_dev * pctldev,unsigned int selector,unsigned int group)1117 static int rza1_set_mux(struct pinctrl_dev *pctldev, unsigned int selector,
1118 unsigned int group)
1119 {
1120 struct rza1_pinctrl *rza1_pctl = pinctrl_dev_get_drvdata(pctldev);
1121 struct rza1_mux_conf *mux_confs;
1122 struct function_desc *func;
1123 struct group_desc *grp;
1124 int i;
1125
1126 grp = pinctrl_generic_get_group(pctldev, group);
1127 if (!grp)
1128 return -EINVAL;
1129
1130 func = pinmux_generic_get_function(pctldev, selector);
1131 if (!func)
1132 return -EINVAL;
1133
1134 mux_confs = (struct rza1_mux_conf *)func->data;
1135 for (i = 0; i < grp->num_pins; ++i) {
1136 int ret;
1137
1138 ret = rza1_pin_mux_single(rza1_pctl, &mux_confs[i]);
1139 if (ret)
1140 return ret;
1141 }
1142
1143 return 0;
1144 }
1145
1146 static const struct pinmux_ops rza1_pinmux_ops = {
1147 .get_functions_count = pinmux_generic_get_function_count,
1148 .get_function_name = pinmux_generic_get_function_name,
1149 .get_function_groups = pinmux_generic_get_function_groups,
1150 .set_mux = rza1_set_mux,
1151 .strict = true,
1152 };
1153
1154 /* ----------------------------------------------------------------------------
1155 * RZ/A1 pin controller driver operations
1156 */
1157
rza1_count_gpio_chips(struct device_node * np)1158 static unsigned int rza1_count_gpio_chips(struct device_node *np)
1159 {
1160 struct device_node *child;
1161 unsigned int count = 0;
1162
1163 for_each_child_of_node(np, child) {
1164 if (!of_property_read_bool(child, "gpio-controller"))
1165 continue;
1166
1167 count++;
1168 }
1169
1170 return count;
1171 }
1172
1173 /**
1174 * rza1_parse_gpiochip() - parse and register a gpio chip and pin range
1175 *
1176 * The gpio controller subnode shall provide a "gpio-ranges" list property as
1177 * defined by gpio device tree binding documentation.
1178 *
1179 * @rza1_pctl: RZ/A1 pin controller device
1180 * @np: of gpio-controller node
1181 * @chip: gpio chip to register to gpiolib
1182 * @range: pin range to register to pinctrl core
1183 */
rza1_parse_gpiochip(struct rza1_pinctrl * rza1_pctl,struct device_node * np,struct gpio_chip * chip,struct pinctrl_gpio_range * range)1184 static int rza1_parse_gpiochip(struct rza1_pinctrl *rza1_pctl,
1185 struct device_node *np,
1186 struct gpio_chip *chip,
1187 struct pinctrl_gpio_range *range)
1188 {
1189 const char *list_name = "gpio-ranges";
1190 struct of_phandle_args of_args;
1191 unsigned int gpioport;
1192 u32 pinctrl_base;
1193 int ret;
1194
1195 ret = of_parse_phandle_with_fixed_args(np, list_name, 3, 0, &of_args);
1196 if (ret) {
1197 dev_err(rza1_pctl->dev, "Unable to parse %s list property\n",
1198 list_name);
1199 return ret;
1200 }
1201
1202 /*
1203 * Find out on which port this gpio-chip maps to by inspecting the
1204 * second argument of the "gpio-ranges" property.
1205 */
1206 pinctrl_base = of_args.args[1];
1207 gpioport = RZA1_PIN_ID_TO_PORT(pinctrl_base);
1208 if (gpioport >= RZA1_NPORTS) {
1209 dev_err(rza1_pctl->dev,
1210 "Invalid values in property %s\n", list_name);
1211 return -EINVAL;
1212 }
1213
1214 *chip = rza1_gpiochip_template;
1215 chip->base = -1;
1216 chip->label = devm_kasprintf(rza1_pctl->dev, GFP_KERNEL, "%pOFn",
1217 np);
1218 if (!chip->label)
1219 return -ENOMEM;
1220
1221 chip->ngpio = of_args.args[2];
1222 chip->of_node = np;
1223 chip->parent = rza1_pctl->dev;
1224
1225 range->id = gpioport;
1226 range->name = chip->label;
1227 range->pin_base = range->base = pinctrl_base;
1228 range->npins = of_args.args[2];
1229 range->gc = chip;
1230
1231 ret = devm_gpiochip_add_data(rza1_pctl->dev, chip,
1232 &rza1_pctl->ports[gpioport]);
1233 if (ret)
1234 return ret;
1235
1236 pinctrl_add_gpio_range(rza1_pctl->pctl, range);
1237
1238 dev_info(rza1_pctl->dev, "Parsed gpiochip %s with %d pins\n",
1239 chip->label, chip->ngpio);
1240
1241 return 0;
1242 }
1243
1244 /**
1245 * rza1_gpio_register() - parse DT to collect gpio-chips and gpio-ranges
1246 *
1247 * @rza1_pctl: RZ/A1 pin controller device
1248 */
rza1_gpio_register(struct rza1_pinctrl * rza1_pctl)1249 static int rza1_gpio_register(struct rza1_pinctrl *rza1_pctl)
1250 {
1251 struct device_node *np = rza1_pctl->dev->of_node;
1252 struct pinctrl_gpio_range *gpio_ranges;
1253 struct gpio_chip *gpio_chips;
1254 struct device_node *child;
1255 unsigned int ngpiochips;
1256 unsigned int i;
1257 int ret;
1258
1259 ngpiochips = rza1_count_gpio_chips(np);
1260 if (ngpiochips == 0) {
1261 dev_dbg(rza1_pctl->dev, "No gpiochip registered\n");
1262 return 0;
1263 }
1264
1265 gpio_chips = devm_kcalloc(rza1_pctl->dev, ngpiochips,
1266 sizeof(*gpio_chips), GFP_KERNEL);
1267 gpio_ranges = devm_kcalloc(rza1_pctl->dev, ngpiochips,
1268 sizeof(*gpio_ranges), GFP_KERNEL);
1269 if (!gpio_chips || !gpio_ranges)
1270 return -ENOMEM;
1271
1272 i = 0;
1273 for_each_child_of_node(np, child) {
1274 if (!of_property_read_bool(child, "gpio-controller"))
1275 continue;
1276
1277 ret = rza1_parse_gpiochip(rza1_pctl, child, &gpio_chips[i],
1278 &gpio_ranges[i]);
1279 if (ret) {
1280 of_node_put(child);
1281 return ret;
1282 }
1283
1284 ++i;
1285 }
1286
1287 dev_info(rza1_pctl->dev, "Registered %u gpio controllers\n", i);
1288
1289 return 0;
1290 }
1291
1292 /**
1293 * rza1_pinctrl_register() - Enumerate pins, ports and gpiochips; register
1294 * them to pinctrl and gpio cores.
1295 *
1296 * @rza1_pctl: RZ/A1 pin controller device
1297 */
rza1_pinctrl_register(struct rza1_pinctrl * rza1_pctl)1298 static int rza1_pinctrl_register(struct rza1_pinctrl *rza1_pctl)
1299 {
1300 struct pinctrl_pin_desc *pins;
1301 struct rza1_port *ports;
1302 unsigned int i;
1303 int ret;
1304
1305 pins = devm_kcalloc(rza1_pctl->dev, RZA1_NPINS, sizeof(*pins),
1306 GFP_KERNEL);
1307 ports = devm_kcalloc(rza1_pctl->dev, RZA1_NPORTS, sizeof(*ports),
1308 GFP_KERNEL);
1309 if (!pins || !ports)
1310 return -ENOMEM;
1311
1312 rza1_pctl->pins = pins;
1313 rza1_pctl->desc.pins = pins;
1314 rza1_pctl->desc.npins = RZA1_NPINS;
1315 rza1_pctl->ports = ports;
1316
1317 for (i = 0; i < RZA1_NPINS; ++i) {
1318 unsigned int pin = RZA1_PIN_ID_TO_PIN(i);
1319 unsigned int port = RZA1_PIN_ID_TO_PORT(i);
1320
1321 pins[i].number = i;
1322 pins[i].name = devm_kasprintf(rza1_pctl->dev, GFP_KERNEL,
1323 "P%u-%u", port, pin);
1324 if (!pins[i].name)
1325 return -ENOMEM;
1326
1327 if (i % RZA1_PINS_PER_PORT == 0) {
1328 /*
1329 * Setup ports;
1330 * they provide per-port lock and logical base address.
1331 */
1332 unsigned int port_id = RZA1_PIN_ID_TO_PORT(i);
1333
1334 ports[port_id].id = port_id;
1335 ports[port_id].base = rza1_pctl->base;
1336 ports[port_id].pins = &pins[i];
1337 spin_lock_init(&ports[port_id].lock);
1338 }
1339 }
1340
1341 ret = devm_pinctrl_register_and_init(rza1_pctl->dev, &rza1_pctl->desc,
1342 rza1_pctl, &rza1_pctl->pctl);
1343 if (ret) {
1344 dev_err(rza1_pctl->dev,
1345 "RZ/A1 pin controller registration failed\n");
1346 return ret;
1347 }
1348
1349 ret = pinctrl_enable(rza1_pctl->pctl);
1350 if (ret) {
1351 dev_err(rza1_pctl->dev,
1352 "RZ/A1 pin controller failed to start\n");
1353 return ret;
1354 }
1355
1356 ret = rza1_gpio_register(rza1_pctl);
1357 if (ret) {
1358 dev_err(rza1_pctl->dev, "RZ/A1 GPIO registration failed\n");
1359 return ret;
1360 }
1361
1362 return 0;
1363 }
1364
rza1_pinctrl_probe(struct platform_device * pdev)1365 static int rza1_pinctrl_probe(struct platform_device *pdev)
1366 {
1367 struct rza1_pinctrl *rza1_pctl;
1368 int ret;
1369
1370 rza1_pctl = devm_kzalloc(&pdev->dev, sizeof(*rza1_pctl), GFP_KERNEL);
1371 if (!rza1_pctl)
1372 return -ENOMEM;
1373
1374 rza1_pctl->dev = &pdev->dev;
1375
1376 rza1_pctl->base = devm_platform_ioremap_resource(pdev, 0);
1377 if (IS_ERR(rza1_pctl->base))
1378 return PTR_ERR(rza1_pctl->base);
1379
1380 mutex_init(&rza1_pctl->mutex);
1381
1382 platform_set_drvdata(pdev, rza1_pctl);
1383
1384 rza1_pctl->desc.name = DRIVER_NAME;
1385 rza1_pctl->desc.pctlops = &rza1_pinctrl_ops;
1386 rza1_pctl->desc.pmxops = &rza1_pinmux_ops;
1387 rza1_pctl->desc.owner = THIS_MODULE;
1388 rza1_pctl->data = of_device_get_match_data(&pdev->dev);
1389
1390 ret = rza1_pinctrl_register(rza1_pctl);
1391 if (ret)
1392 return ret;
1393
1394 dev_info(&pdev->dev,
1395 "RZ/A1 pin controller and gpio successfully registered\n");
1396
1397 return 0;
1398 }
1399
1400 static const struct of_device_id rza1_pinctrl_of_match[] = {
1401 {
1402 /* RZ/A1H, RZ/A1M */
1403 .compatible = "renesas,r7s72100-ports",
1404 .data = &rza1h_pmx_conf,
1405 },
1406 {
1407 /* RZ/A1L */
1408 .compatible = "renesas,r7s72102-ports",
1409 .data = &rza1l_pmx_conf,
1410 },
1411 { }
1412 };
1413
1414 static struct platform_driver rza1_pinctrl_driver = {
1415 .driver = {
1416 .name = DRIVER_NAME,
1417 .of_match_table = rza1_pinctrl_of_match,
1418 },
1419 .probe = rza1_pinctrl_probe,
1420 };
1421
rza1_pinctrl_init(void)1422 static int __init rza1_pinctrl_init(void)
1423 {
1424 return platform_driver_register(&rza1_pinctrl_driver);
1425 }
1426 core_initcall(rza1_pinctrl_init);
1427
1428 MODULE_AUTHOR("Jacopo Mondi <jacopo+renesas@jmondi.org");
1429 MODULE_DESCRIPTION("Pin and gpio controller driver for Reneas RZ/A1 SoC");
1430 MODULE_LICENSE("GPL v2");
1431
