1 /*
2 * Driver for the Axis ARTPEC-6 pin controller
3 *
4 * Author: Chris Paterson <chris.paterson@linux.pieboy.co.uk>
5 *
6 * This file is licensed under the terms of the GNU General Public
7 * License version 2. This program is licensed "as is" without any
8 * warranty of any kind, whether express or implied.
9 */
10
11 #include <linux/device.h>
12 #include <linux/err.h>
13 #include <linux/init.h>
14 #include <linux/io.h>
15 #include <linux/of.h>
16 #include <linux/platform_device.h>
17 #include <linux/pinctrl/pinctrl.h>
18 #include <linux/pinctrl/pinconf-generic.h>
19 #include <linux/pinctrl/pinconf.h>
20 #include <linux/pinctrl/pinmux.h>
21 #include <linux/slab.h>
22 #include "core.h"
23 #include "pinconf.h"
24 #include "pinctrl-utils.h"
25
26 #define ARTPEC6_LAST_PIN 97 /* 97 pins in pinmux */
27 #define ARTPEC6_MAX_MUXABLE 35 /* Last pin with muxable function */
28
29 /* Pinmux control register bit definitions */
30 #define ARTPEC6_PINMUX_UDC0_MASK 0x00000001
31 #define ARTPEC6_PINMUX_UDC0_SHIFT 0
32 #define ARTPEC6_PINMUX_UDC1_MASK 0x00000002
33 #define ARTPEC6_PINMUX_UDC1_SHIFT 1
34 #define ARTPEC6_PINMUX_DRV_MASK 0x00000060
35 #define ARTPEC6_PINMUX_DRV_SHIFT 5
36 #define ARTPEC6_PINMUX_SEL_MASK 0x00003000
37 #define ARTPEC6_PINMUX_SEL_SHIFT 12
38
39 /* Pinmux configurations */
40 #define ARTPEC6_CONFIG_0 0
41 #define ARTPEC6_CONFIG_1 1
42 #define ARTPEC6_CONFIG_2 2
43 #define ARTPEC6_CONFIG_3 3
44
45 /* Pin drive strength options */
46 #define ARTPEC6_DRIVE_4mA 4
47 #define ARTPEC6_DRIVE_4mA_SET 0
48 #define ARTPEC6_DRIVE_6mA 6
49 #define ARTPEC6_DRIVE_6mA_SET 1
50 #define ARTPEC6_DRIVE_8mA 8
51 #define ARTPEC6_DRIVE_8mA_SET 2
52 #define ARTPEC6_DRIVE_9mA 9
53 #define ARTPEC6_DRIVE_9mA_SET 3
54
55 struct artpec6_pmx {
56 struct device *dev;
57 struct pinctrl_dev *pctl;
58 void __iomem *base;
59 struct pinctrl_pin_desc *pins;
60 unsigned int num_pins;
61 const struct artpec6_pin_group *pin_groups;
62 unsigned int num_pin_groups;
63 const struct artpec6_pmx_func *functions;
64 unsigned int num_functions;
65 };
66
67 struct artpec6_pin_group {
68 const char *name;
69 const unsigned int *pins;
70 const unsigned int num_pins;
71 unsigned char config;
72 };
73
74 struct artpec6_pmx_func {
75 const char *name;
76 const char * const *groups;
77 const unsigned int num_groups;
78 };
79
80 /* pins */
81 static struct pinctrl_pin_desc artpec6_pins[] = {
82 PINCTRL_PIN(0, "GPIO0"),
83 PINCTRL_PIN(1, "GPIO1"),
84 PINCTRL_PIN(2, "GPIO2"),
85 PINCTRL_PIN(3, "GPIO3"),
86 PINCTRL_PIN(4, "GPIO4"),
87 PINCTRL_PIN(5, "GPIO5"),
88 PINCTRL_PIN(6, "GPIO6"),
89 PINCTRL_PIN(7, "GPIO7"),
90 PINCTRL_PIN(8, "GPIO8"),
91 PINCTRL_PIN(9, "GPIO9"),
92 PINCTRL_PIN(10, "GPIO10"),
93 PINCTRL_PIN(11, "GPIO11"),
94 PINCTRL_PIN(12, "GPIO12"),
95 PINCTRL_PIN(13, "GPIO13"),
96 PINCTRL_PIN(14, "GPIO14"),
97 PINCTRL_PIN(15, "GPIO15"),
98 PINCTRL_PIN(16, "GPIO16"),
99 PINCTRL_PIN(17, "GPIO17"),
100 PINCTRL_PIN(18, "GPIO18"),
101 PINCTRL_PIN(19, "GPIO19"),
102 PINCTRL_PIN(20, "GPIO20"),
103 PINCTRL_PIN(21, "GPIO21"),
104 PINCTRL_PIN(22, "GPIO22"),
105 PINCTRL_PIN(23, "GPIO23"),
106 PINCTRL_PIN(24, "GPIO24"),
107 PINCTRL_PIN(25, "GPIO25"),
108 PINCTRL_PIN(26, "GPIO26"),
109 PINCTRL_PIN(27, "GPIO27"),
110 PINCTRL_PIN(28, "GPIO28"),
111 PINCTRL_PIN(29, "GPIO29"),
112 PINCTRL_PIN(30, "GPIO30"),
113 PINCTRL_PIN(31, "GPIO31"),
114 PINCTRL_PIN(32, "UART3_TXD"),
115 PINCTRL_PIN(33, "UART3_RXD"),
116 PINCTRL_PIN(34, "UART3_RTS"),
117 PINCTRL_PIN(35, "UART3_CTS"),
118 PINCTRL_PIN(36, "NF_ALE"),
119 PINCTRL_PIN(37, "NF_CE0_N"),
120 PINCTRL_PIN(38, "NF_CE1_N"),
121 PINCTRL_PIN(39, "NF_CLE"),
122 PINCTRL_PIN(40, "NF_RE_N"),
123 PINCTRL_PIN(41, "NF_WE_N"),
124 PINCTRL_PIN(42, "NF_WP0_N"),
125 PINCTRL_PIN(43, "NF_WP1_N"),
126 PINCTRL_PIN(44, "NF_IO0"),
127 PINCTRL_PIN(45, "NF_IO1"),
128 PINCTRL_PIN(46, "NF_IO2"),
129 PINCTRL_PIN(47, "NF_IO3"),
130 PINCTRL_PIN(48, "NF_IO4"),
131 PINCTRL_PIN(49, "NF_IO5"),
132 PINCTRL_PIN(50, "NF_IO6"),
133 PINCTRL_PIN(51, "NF_IO7"),
134 PINCTRL_PIN(52, "NF_RB0_N"),
135 PINCTRL_PIN(53, "SDIO0_CLK"),
136 PINCTRL_PIN(54, "SDIO0_CMD"),
137 PINCTRL_PIN(55, "SDIO0_DAT0"),
138 PINCTRL_PIN(56, "SDIO0_DAT1"),
139 PINCTRL_PIN(57, "SDIO0_DAT2"),
140 PINCTRL_PIN(58, "SDIO0_DAT3"),
141 PINCTRL_PIN(59, "SDI0_CD"),
142 PINCTRL_PIN(60, "SDI0_WP"),
143 PINCTRL_PIN(61, "SDIO1_CLK"),
144 PINCTRL_PIN(62, "SDIO1_CMD"),
145 PINCTRL_PIN(63, "SDIO1_DAT0"),
146 PINCTRL_PIN(64, "SDIO1_DAT1"),
147 PINCTRL_PIN(65, "SDIO1_DAT2"),
148 PINCTRL_PIN(66, "SDIO1_DAT3"),
149 PINCTRL_PIN(67, "SDIO1_CD"),
150 PINCTRL_PIN(68, "SDIO1_WP"),
151 PINCTRL_PIN(69, "GBE_REFCLk"),
152 PINCTRL_PIN(70, "GBE_GTX_CLK"),
153 PINCTRL_PIN(71, "GBE_TX_CLK"),
154 PINCTRL_PIN(72, "GBE_TX_EN"),
155 PINCTRL_PIN(73, "GBE_TX_ER"),
156 PINCTRL_PIN(74, "GBE_TXD0"),
157 PINCTRL_PIN(75, "GBE_TXD1"),
158 PINCTRL_PIN(76, "GBE_TXD2"),
159 PINCTRL_PIN(77, "GBE_TXD3"),
160 PINCTRL_PIN(78, "GBE_TXD4"),
161 PINCTRL_PIN(79, "GBE_TXD5"),
162 PINCTRL_PIN(80, "GBE_TXD6"),
163 PINCTRL_PIN(81, "GBE_TXD7"),
164 PINCTRL_PIN(82, "GBE_RX_CLK"),
165 PINCTRL_PIN(83, "GBE_RX_DV"),
166 PINCTRL_PIN(84, "GBE_RX_ER"),
167 PINCTRL_PIN(85, "GBE_RXD0"),
168 PINCTRL_PIN(86, "GBE_RXD1"),
169 PINCTRL_PIN(87, "GBE_RXD2"),
170 PINCTRL_PIN(88, "GBE_RXD3"),
171 PINCTRL_PIN(89, "GBE_RXD4"),
172 PINCTRL_PIN(90, "GBE_RXD5"),
173 PINCTRL_PIN(91, "GBE_RXD6"),
174 PINCTRL_PIN(92, "GBE_RXD7"),
175 PINCTRL_PIN(93, "GBE_CRS"),
176 PINCTRL_PIN(94, "GBE_COL"),
177 PINCTRL_PIN(95, "GBE_MDC"),
178 PINCTRL_PIN(96, "GBE_MDIO"),
179 };
180
181 static const unsigned int cpuclkout_pins0[] = { 0 };
182 static const unsigned int udlclkout_pins0[] = { 1 };
183 static const unsigned int i2c1_pins0[] = { 2, 3 };
184 static const unsigned int i2c2_pins0[] = { 4, 5 };
185 static const unsigned int i2c3_pins0[] = { 6, 7 };
186 static const unsigned int i2s0_pins0[] = { 8, 9, 10, 11 };
187 static const unsigned int i2s1_pins0[] = { 12, 13, 14, 15 };
188 static const unsigned int i2srefclk_pins0[] = { 19 };
189 static const unsigned int spi0_pins0[] = { 12, 13, 14, 15 };
190 static const unsigned int spi1_pins0[] = { 16, 17, 18, 19 };
191 static const unsigned int pciedebug_pins0[] = { 12, 13, 14, 15 };
192 static const unsigned int uart0_pins0[] = { 16, 17, 18, 19, 20,
193 21, 22, 23, 24, 25 };
194 static const unsigned int uart0_pins1[] = { 20, 21, 22, 23 };
195 static const unsigned int uart1_pins0[] = { 24, 25, 26, 27 };
196 static const unsigned int uart2_pins0[] = { 26, 27, 28, 29, 30,
197 31, 32, 33, 34, 35 };
198 static const unsigned int uart2_pins1[] = { 28, 29, 30, 31 };
199 static const unsigned int uart3_pins0[] = { 32, 33, 34, 35 };
200 static const unsigned int uart4_pins0[] = { 20, 21, 22, 23 };
201 static const unsigned int uart5_pins0[] = { 28, 29, 30, 31 };
202 static const unsigned int nand_pins0[] = { 36, 37, 38, 39, 40, 41,
203 42, 43, 44, 45, 46, 47,
204 48, 49, 50, 51, 52 };
205 static const unsigned int sdio0_pins0[] = { 53, 54, 55, 56, 57, 58, 59, 60 };
206 static const unsigned int sdio1_pins0[] = { 61, 62, 63, 64, 65, 66, 67, 68 };
207 static const unsigned int ethernet_pins0[] = { 69, 70, 71, 72, 73, 74, 75,
208 76, 77, 78, 79, 80, 81, 82,
209 83, 84, 85, 86, 87, 88, 89,
210 90, 91, 92, 93, 94, 95, 96 };
211
212 static const struct artpec6_pin_group artpec6_pin_groups[] = {
213 {
214 .name = "cpuclkoutgrp0",
215 .pins = cpuclkout_pins0,
216 .num_pins = ARRAY_SIZE(cpuclkout_pins0),
217 .config = ARTPEC6_CONFIG_1,
218 },
219 {
220 .name = "udlclkoutgrp0",
221 .pins = udlclkout_pins0,
222 .num_pins = ARRAY_SIZE(udlclkout_pins0),
223 .config = ARTPEC6_CONFIG_1,
224 },
225 {
226 .name = "i2c1grp0",
227 .pins = i2c1_pins0,
228 .num_pins = ARRAY_SIZE(i2c1_pins0),
229 .config = ARTPEC6_CONFIG_1,
230 },
231 {
232 .name = "i2c2grp0",
233 .pins = i2c2_pins0,
234 .num_pins = ARRAY_SIZE(i2c2_pins0),
235 .config = ARTPEC6_CONFIG_1,
236 },
237 {
238 .name = "i2c3grp0",
239 .pins = i2c3_pins0,
240 .num_pins = ARRAY_SIZE(i2c3_pins0),
241 .config = ARTPEC6_CONFIG_1,
242 },
243 {
244 .name = "i2s0grp0",
245 .pins = i2s0_pins0,
246 .num_pins = ARRAY_SIZE(i2s0_pins0),
247 .config = ARTPEC6_CONFIG_1,
248 },
249 {
250 .name = "i2s1grp0",
251 .pins = i2s1_pins0,
252 .num_pins = ARRAY_SIZE(i2s1_pins0),
253 .config = ARTPEC6_CONFIG_1,
254 },
255 {
256 .name = "i2srefclkgrp0",
257 .pins = i2srefclk_pins0,
258 .num_pins = ARRAY_SIZE(i2srefclk_pins0),
259 .config = ARTPEC6_CONFIG_3,
260 },
261 {
262 .name = "spi0grp0",
263 .pins = spi0_pins0,
264 .num_pins = ARRAY_SIZE(spi0_pins0),
265 .config = ARTPEC6_CONFIG_2,
266 },
267 {
268 .name = "spi1grp0",
269 .pins = spi1_pins0,
270 .num_pins = ARRAY_SIZE(spi1_pins0),
271 .config = ARTPEC6_CONFIG_2,
272 },
273 {
274 .name = "pciedebuggrp0",
275 .pins = pciedebug_pins0,
276 .num_pins = ARRAY_SIZE(pciedebug_pins0),
277 .config = ARTPEC6_CONFIG_3,
278 },
279 {
280 .name = "uart0grp0", /* All pins. */
281 .pins = uart0_pins0,
282 .num_pins = ARRAY_SIZE(uart0_pins0),
283 .config = ARTPEC6_CONFIG_1,
284 },
285 {
286 .name = "uart0grp1", /* RX/TX and RTS/CTS */
287 .pins = uart0_pins1,
288 .num_pins = ARRAY_SIZE(uart0_pins1),
289 .config = ARTPEC6_CONFIG_1,
290 },
291 {
292 .name = "uart0grp2", /* Only RX/TX pins. */
293 .pins = uart0_pins1,
294 .num_pins = ARRAY_SIZE(uart0_pins1) - 2,
295 .config = ARTPEC6_CONFIG_1,
296 },
297 {
298 .name = "uart1grp0", /* RX/TX and RTS/CTS */
299 .pins = uart1_pins0,
300 .num_pins = ARRAY_SIZE(uart1_pins0),
301 .config = ARTPEC6_CONFIG_2,
302 },
303 {
304 .name = "uart1grp1", /* Only RX/TX pins. */
305 .pins = uart1_pins0,
306 .num_pins = 2,
307 .config = ARTPEC6_CONFIG_2,
308 },
309 {
310 .name = "uart2grp0", /* Full pinout */
311 .pins = uart2_pins0,
312 .num_pins = ARRAY_SIZE(uart2_pins0),
313 .config = ARTPEC6_CONFIG_1,
314 },
315 {
316 .name = "uart2grp1", /* RX/TX and RTS/CTS */
317 .pins = uart2_pins1,
318 .num_pins = ARRAY_SIZE(uart2_pins1),
319 .config = ARTPEC6_CONFIG_1,
320 },
321 {
322 .name = "uart2grp2", /* Only RX/TX */
323 .pins = uart2_pins1,
324 .num_pins = 2,
325 .config = ARTPEC6_CONFIG_1,
326 },
327 {
328 .name = "uart3grp0", /* RX/TX and CTS/RTS */
329 .pins = uart3_pins0,
330 .num_pins = ARRAY_SIZE(uart3_pins0),
331 .config = ARTPEC6_CONFIG_0,
332 },
333 {
334 .name = "uart3grp1", /* Only RX/TX */
335 .pins = uart3_pins0,
336 .num_pins = ARRAY_SIZE(uart3_pins0),
337 .config = ARTPEC6_CONFIG_0,
338 },
339 {
340 .name = "uart4grp0",
341 .pins = uart4_pins0,
342 .num_pins = ARRAY_SIZE(uart4_pins0),
343 .config = ARTPEC6_CONFIG_2,
344 },
345 {
346 .name = "uart5grp0", /* TX/RX and RTS/CTS */
347 .pins = uart5_pins0,
348 .num_pins = ARRAY_SIZE(uart5_pins0),
349 .config = ARTPEC6_CONFIG_2,
350 },
351 {
352 .name = "uart5grp1", /* Only TX/RX */
353 .pins = uart5_pins0,
354 .num_pins = 2,
355 .config = ARTPEC6_CONFIG_2,
356 },
357 {
358 .name = "uart5nocts", /* TX/RX/RTS */
359 .pins = uart5_pins0,
360 .num_pins = ARRAY_SIZE(uart5_pins0) - 1,
361 .config = ARTPEC6_CONFIG_2,
362 },
363 {
364 .name = "nandgrp0",
365 .pins = nand_pins0,
366 .num_pins = ARRAY_SIZE(nand_pins0),
367 .config = ARTPEC6_CONFIG_0,
368 },
369 {
370 .name = "sdio0grp0",
371 .pins = sdio0_pins0,
372 .num_pins = ARRAY_SIZE(sdio0_pins0),
373 .config = ARTPEC6_CONFIG_0,
374 },
375 {
376 .name = "sdio1grp0",
377 .pins = sdio1_pins0,
378 .num_pins = ARRAY_SIZE(sdio1_pins0),
379 .config = ARTPEC6_CONFIG_0,
380 },
381 {
382 .name = "ethernetgrp0",
383 .pins = ethernet_pins0,
384 .num_pins = ARRAY_SIZE(ethernet_pins0),
385 .config = ARTPEC6_CONFIG_0,
386 },
387 };
388
389 struct pin_register {
390 unsigned int start;
391 unsigned int end;
392 unsigned int reg_base;
393 };
394
395 /*
396 * The register map has two holes where the pin number
397 * no longer fits directly with the register offset.
398 * This table allows us to map this easily.
399 */
400 static const struct pin_register pin_register[] = {
401 { 0, 35, 0x0 }, /* 0x0 - 0x8c */
402 { 36, 52, 0x100 }, /* 0x100 - 0x140 */
403 { 53, 96, 0x180 }, /* 0x180 - 0x22c */
404 };
405
artpec6_pmx_reg_offset(unsigned int pin)406 static unsigned int artpec6_pmx_reg_offset(unsigned int pin)
407 {
408 int i;
409
410 for (i = 0; i < ARRAY_SIZE(pin_register); i++) {
411 if (pin <= pin_register[i].end) {
412 return (pin - pin_register[i].start) * 4 +
413 pin_register[i].reg_base;
414 }
415 }
416 /*
417 * Anything we return here is wrong, but we can only
418 * get here if pin is outside registered range.
419 */
420 pr_err("%s: Impossible pin %d\n", __func__, pin);
421 return 0;
422 }
423
artpec6_get_groups_count(struct pinctrl_dev * pctldev)424 static int artpec6_get_groups_count(struct pinctrl_dev *pctldev)
425 {
426 return ARRAY_SIZE(artpec6_pin_groups);
427 }
428
artpec6_get_group_name(struct pinctrl_dev * pctldev,unsigned int group)429 static const char *artpec6_get_group_name(struct pinctrl_dev *pctldev,
430 unsigned int group)
431 {
432 return artpec6_pin_groups[group].name;
433 }
434
artpec6_get_group_pins(struct pinctrl_dev * pctldev,unsigned int group,const unsigned int ** pins,unsigned int * num_pins)435 static int artpec6_get_group_pins(struct pinctrl_dev *pctldev,
436 unsigned int group,
437 const unsigned int **pins,
438 unsigned int *num_pins)
439 {
440 *pins = (unsigned int *)artpec6_pin_groups[group].pins;
441 *num_pins = artpec6_pin_groups[group].num_pins;
442 return 0;
443 }
444
artpec6_pconf_drive_mA_to_field(unsigned int mA)445 static int artpec6_pconf_drive_mA_to_field(unsigned int mA)
446 {
447 switch (mA) {
448 case ARTPEC6_DRIVE_4mA:
449 return ARTPEC6_DRIVE_4mA_SET;
450 case ARTPEC6_DRIVE_6mA:
451 return ARTPEC6_DRIVE_6mA_SET;
452 case ARTPEC6_DRIVE_8mA:
453 return ARTPEC6_DRIVE_8mA_SET;
454 case ARTPEC6_DRIVE_9mA:
455 return ARTPEC6_DRIVE_9mA_SET;
456 default:
457 return -EINVAL;
458 }
459 }
460
artpec6_pconf_drive_field_to_mA(int field)461 static unsigned int artpec6_pconf_drive_field_to_mA(int field)
462 {
463 switch (field) {
464 case ARTPEC6_DRIVE_4mA_SET:
465 return ARTPEC6_DRIVE_4mA;
466 case ARTPEC6_DRIVE_6mA_SET:
467 return ARTPEC6_DRIVE_6mA;
468 case ARTPEC6_DRIVE_8mA_SET:
469 return ARTPEC6_DRIVE_8mA;
470 case ARTPEC6_DRIVE_9mA_SET:
471 return ARTPEC6_DRIVE_9mA;
472 default:
473 /* Shouldn't happen */
474 return 0;
475 }
476 }
477
478 static const struct pinctrl_ops artpec6_pctrl_ops = {
479 .get_group_pins = artpec6_get_group_pins,
480 .get_groups_count = artpec6_get_groups_count,
481 .get_group_name = artpec6_get_group_name,
482 .dt_node_to_map = pinconf_generic_dt_node_to_map_all,
483 .dt_free_map = pinctrl_utils_free_map,
484 };
485
486 static const char * const gpiogrps[] = {
487 "cpuclkoutgrp0", "udlclkoutgrp0", "i2c1grp0", "i2c2grp0",
488 "i2c3grp0", "i2s0grp0", "i2s1grp0", "i2srefclkgrp0",
489 "spi0grp0", "spi1grp0", "pciedebuggrp0", "uart0grp0",
490 "uart0grp1", "uart0grp2", "uart1grp0", "uart1grp1",
491 "uart2grp0", "uart2grp1", "uart2grp2", "uart4grp0", "uart5grp0",
492 "uart5grp1", "uart5nocts",
493 };
494 static const char * const cpuclkoutgrps[] = { "cpuclkoutgrp0" };
495 static const char * const udlclkoutgrps[] = { "udlclkoutgrp0" };
496 static const char * const i2c1grps[] = { "i2c1grp0" };
497 static const char * const i2c2grps[] = { "i2c2grp0" };
498 static const char * const i2c3grps[] = { "i2c3grp0" };
499 static const char * const i2s0grps[] = { "i2s0grp0" };
500 static const char * const i2s1grps[] = { "i2s1grp0" };
501 static const char * const i2srefclkgrps[] = { "i2srefclkgrp0" };
502 static const char * const spi0grps[] = { "spi0grp0" };
503 static const char * const spi1grps[] = { "spi1grp0" };
504 static const char * const pciedebuggrps[] = { "pciedebuggrp0" };
505 static const char * const uart0grps[] = { "uart0grp0", "uart0grp1",
506 "uart0grp2" };
507 static const char * const uart1grps[] = { "uart1grp0", "uart1grp1" };
508 static const char * const uart2grps[] = { "uart2grp0", "uart2grp1",
509 "uart2grp2" };
510 static const char * const uart3grps[] = { "uart3grp0" };
511 static const char * const uart4grps[] = { "uart4grp0", "uart4grp1" };
512 static const char * const uart5grps[] = { "uart5grp0", "uart5grp1",
513 "uart5nocts" };
514 static const char * const nandgrps[] = { "nandgrp0" };
515 static const char * const sdio0grps[] = { "sdio0grp0" };
516 static const char * const sdio1grps[] = { "sdio1grp0" };
517 static const char * const ethernetgrps[] = { "ethernetgrp0" };
518
519 static const struct artpec6_pmx_func artpec6_pmx_functions[] = {
520 {
521 .name = "gpio",
522 .groups = gpiogrps,
523 .num_groups = ARRAY_SIZE(gpiogrps),
524 },
525 {
526 .name = "cpuclkout",
527 .groups = cpuclkoutgrps,
528 .num_groups = ARRAY_SIZE(cpuclkoutgrps),
529 },
530 {
531 .name = "udlclkout",
532 .groups = udlclkoutgrps,
533 .num_groups = ARRAY_SIZE(udlclkoutgrps),
534 },
535 {
536 .name = "i2c1",
537 .groups = i2c1grps,
538 .num_groups = ARRAY_SIZE(i2c1grps),
539 },
540 {
541 .name = "i2c2",
542 .groups = i2c2grps,
543 .num_groups = ARRAY_SIZE(i2c2grps),
544 },
545 {
546 .name = "i2c3",
547 .groups = i2c3grps,
548 .num_groups = ARRAY_SIZE(i2c3grps),
549 },
550 {
551 .name = "i2s0",
552 .groups = i2s0grps,
553 .num_groups = ARRAY_SIZE(i2s0grps),
554 },
555 {
556 .name = "i2s1",
557 .groups = i2s1grps,
558 .num_groups = ARRAY_SIZE(i2s1grps),
559 },
560 {
561 .name = "i2srefclk",
562 .groups = i2srefclkgrps,
563 .num_groups = ARRAY_SIZE(i2srefclkgrps),
564 },
565 {
566 .name = "spi0",
567 .groups = spi0grps,
568 .num_groups = ARRAY_SIZE(spi0grps),
569 },
570 {
571 .name = "spi1",
572 .groups = spi1grps,
573 .num_groups = ARRAY_SIZE(spi1grps),
574 },
575 {
576 .name = "pciedebug",
577 .groups = pciedebuggrps,
578 .num_groups = ARRAY_SIZE(pciedebuggrps),
579 },
580 {
581 .name = "uart0",
582 .groups = uart0grps,
583 .num_groups = ARRAY_SIZE(uart0grps),
584 },
585 {
586 .name = "uart1",
587 .groups = uart1grps,
588 .num_groups = ARRAY_SIZE(uart1grps),
589 },
590 {
591 .name = "uart2",
592 .groups = uart2grps,
593 .num_groups = ARRAY_SIZE(uart2grps),
594 },
595 {
596 .name = "uart3",
597 .groups = uart3grps,
598 .num_groups = ARRAY_SIZE(uart3grps),
599 },
600 {
601 .name = "uart4",
602 .groups = uart4grps,
603 .num_groups = ARRAY_SIZE(uart4grps),
604 },
605 {
606 .name = "uart5",
607 .groups = uart5grps,
608 .num_groups = ARRAY_SIZE(uart5grps),
609 },
610 {
611 .name = "nand",
612 .groups = nandgrps,
613 .num_groups = ARRAY_SIZE(nandgrps),
614 },
615 {
616 .name = "sdio0",
617 .groups = sdio0grps,
618 .num_groups = ARRAY_SIZE(sdio0grps),
619 },
620 {
621 .name = "sdio1",
622 .groups = sdio1grps,
623 .num_groups = ARRAY_SIZE(sdio1grps),
624 },
625 {
626 .name = "ethernet",
627 .groups = ethernetgrps,
628 .num_groups = ARRAY_SIZE(ethernetgrps),
629 },
630 };
631
artpec6_pmx_get_functions_count(struct pinctrl_dev * pctldev)632 static int artpec6_pmx_get_functions_count(struct pinctrl_dev *pctldev)
633 {
634 return ARRAY_SIZE(artpec6_pmx_functions);
635 }
636
artpec6_pmx_get_fname(struct pinctrl_dev * pctldev,unsigned int function)637 static const char *artpec6_pmx_get_fname(struct pinctrl_dev *pctldev,
638 unsigned int function)
639 {
640 return artpec6_pmx_functions[function].name;
641 }
642
artpec6_pmx_get_fgroups(struct pinctrl_dev * pctldev,unsigned int function,const char * const ** groups,unsigned int * const num_groups)643 static int artpec6_pmx_get_fgroups(struct pinctrl_dev *pctldev,
644 unsigned int function,
645 const char * const **groups,
646 unsigned int * const num_groups)
647 {
648 *groups = artpec6_pmx_functions[function].groups;
649 *num_groups = artpec6_pmx_functions[function].num_groups;
650 return 0;
651 }
652
artpec6_pmx_select_func(struct pinctrl_dev * pctldev,unsigned int function,unsigned int group,bool enable)653 static void artpec6_pmx_select_func(struct pinctrl_dev *pctldev,
654 unsigned int function, unsigned int group,
655 bool enable)
656 {
657 unsigned int regval, val;
658 unsigned int reg;
659 int i;
660 struct artpec6_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
661
662 for (i = 0; i < artpec6_pin_groups[group].num_pins; i++) {
663 /*
664 * Registers for pins above a ARTPEC6_MAX_MUXABLE
665 * do not have a SEL field and are always selected.
666 */
667 if (artpec6_pin_groups[group].pins[i] > ARTPEC6_MAX_MUXABLE)
668 continue;
669
670 if (!strcmp(artpec6_pmx_get_fname(pctldev, function), "gpio")) {
671 /* GPIO is always config 0 */
672 val = ARTPEC6_CONFIG_0 << ARTPEC6_PINMUX_SEL_SHIFT;
673 } else {
674 if (enable)
675 val = artpec6_pin_groups[group].config
676 << ARTPEC6_PINMUX_SEL_SHIFT;
677 else
678 val = ARTPEC6_CONFIG_0
679 << ARTPEC6_PINMUX_SEL_SHIFT;
680 }
681
682 reg = artpec6_pmx_reg_offset(artpec6_pin_groups[group].pins[i]);
683
684 regval = readl(pmx->base + reg);
685 regval &= ~ARTPEC6_PINMUX_SEL_MASK;
686 regval |= val;
687 writel(regval, pmx->base + reg);
688 }
689 }
690
artpec6_pmx_set(struct pinctrl_dev * pctldev,unsigned int function,unsigned int group)691 static int artpec6_pmx_set(struct pinctrl_dev *pctldev,
692 unsigned int function,
693 unsigned int group)
694 {
695 struct artpec6_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
696
697 dev_dbg(pmx->dev, "enabling %s function for pin group %s\n",
698 artpec6_pmx_get_fname(pctldev, function),
699 artpec6_get_group_name(pctldev, group));
700
701 artpec6_pmx_select_func(pctldev, function, group, true);
702
703 return 0;
704 }
705
artpec6_pmx_request_gpio(struct pinctrl_dev * pctldev,struct pinctrl_gpio_range * range,unsigned int pin)706 static int artpec6_pmx_request_gpio(struct pinctrl_dev *pctldev,
707 struct pinctrl_gpio_range *range,
708 unsigned int pin)
709 {
710 struct artpec6_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
711 unsigned int reg = artpec6_pmx_reg_offset(pin);
712 u32 val;
713
714 if (pin >= 32)
715 return -EINVAL;
716
717 val = readl_relaxed(pmx->base + reg);
718 val &= ~ARTPEC6_PINMUX_SEL_MASK;
719 val |= ARTPEC6_CONFIG_0 << ARTPEC6_PINMUX_SEL_SHIFT;
720 writel_relaxed(val, pmx->base + reg);
721
722 return 0;
723 }
724
725 static const struct pinmux_ops artpec6_pmx_ops = {
726 .get_functions_count = artpec6_pmx_get_functions_count,
727 .get_function_name = artpec6_pmx_get_fname,
728 .get_function_groups = artpec6_pmx_get_fgroups,
729 .set_mux = artpec6_pmx_set,
730 .gpio_request_enable = artpec6_pmx_request_gpio,
731 };
732
artpec6_pconf_get(struct pinctrl_dev * pctldev,unsigned int pin,unsigned long * config)733 static int artpec6_pconf_get(struct pinctrl_dev *pctldev, unsigned int pin,
734 unsigned long *config)
735 {
736 struct artpec6_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
737 enum pin_config_param param = pinconf_to_config_param(*config);
738 unsigned int regval;
739
740 /* Check for valid pin */
741 if (pin >= pmx->num_pins) {
742 dev_dbg(pmx->dev, "pinconf is not supported for pin %s\n",
743 pmx->pins[pin].name);
744 return -ENOTSUPP;
745 }
746
747 dev_dbg(pmx->dev, "getting configuration for pin %s\n",
748 pmx->pins[pin].name);
749
750 /* Read pin register values */
751 regval = readl(pmx->base + artpec6_pmx_reg_offset(pin));
752
753 /* If valid, get configuration for parameter */
754 switch (param) {
755 case PIN_CONFIG_BIAS_DISABLE:
756 if (!(regval & ARTPEC6_PINMUX_UDC1_MASK))
757 return -EINVAL;
758 break;
759
760 case PIN_CONFIG_BIAS_PULL_UP:
761 case PIN_CONFIG_BIAS_PULL_DOWN:
762 if (regval & ARTPEC6_PINMUX_UDC1_MASK)
763 return -EINVAL;
764
765 regval = regval & ARTPEC6_PINMUX_UDC0_MASK;
766 if ((param == PIN_CONFIG_BIAS_PULL_UP && !regval) ||
767 (param == PIN_CONFIG_BIAS_PULL_DOWN && regval))
768 return -EINVAL;
769 break;
770 case PIN_CONFIG_DRIVE_STRENGTH:
771 regval = (regval & ARTPEC6_PINMUX_DRV_MASK)
772 >> ARTPEC6_PINMUX_DRV_SHIFT;
773 regval = artpec6_pconf_drive_field_to_mA(regval);
774 *config = pinconf_to_config_packed(param, regval);
775 break;
776 default:
777 return -ENOTSUPP;
778 }
779
780 return 0;
781 }
782
783 /*
784 * Valid combinations of param and arg:
785 *
786 * param arg
787 * PIN_CONFIG_BIAS_DISABLE: x (disable bias)
788 * PIN_CONFIG_BIAS_PULL_UP: 1 (pull up bias + enable)
789 * PIN_CONFIG_BIAS_PULL_DOWN: 1 (pull down bias + enable)
790 * PIN_CONFIG_DRIVE_STRENGTH: x (4mA, 6mA, 8mA, 9mA)
791 *
792 * All other args are invalid. All other params are not supported.
793 */
artpec6_pconf_set(struct pinctrl_dev * pctldev,unsigned int pin,unsigned long * configs,unsigned int num_configs)794 static int artpec6_pconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
795 unsigned long *configs, unsigned int num_configs)
796 {
797 struct artpec6_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
798 enum pin_config_param param;
799 unsigned int arg;
800 unsigned int regval;
801 void __iomem *reg;
802 int i;
803
804 /* Check for valid pin */
805 if (pin >= pmx->num_pins) {
806 dev_dbg(pmx->dev, "pinconf is not supported for pin %s\n",
807 pmx->pins[pin].name);
808 return -ENOTSUPP;
809 }
810
811 dev_dbg(pmx->dev, "setting configuration for pin %s\n",
812 pmx->pins[pin].name);
813
814 reg = pmx->base + artpec6_pmx_reg_offset(pin);
815
816 /* For each config */
817 for (i = 0; i < num_configs; i++) {
818 int drive;
819
820 param = pinconf_to_config_param(configs[i]);
821 arg = pinconf_to_config_argument(configs[i]);
822
823 switch (param) {
824 case PIN_CONFIG_BIAS_DISABLE:
825 regval = readl(reg);
826 regval |= (1 << ARTPEC6_PINMUX_UDC1_SHIFT);
827 writel(regval, reg);
828 break;
829
830 case PIN_CONFIG_BIAS_PULL_UP:
831 if (arg != 1) {
832 dev_dbg(pctldev->dev, "%s: arg %u out of range\n",
833 __func__, arg);
834 return -EINVAL;
835 }
836
837 regval = readl(reg);
838 regval |= (arg << ARTPEC6_PINMUX_UDC0_SHIFT);
839 regval &= ~ARTPEC6_PINMUX_UDC1_MASK; /* Enable */
840 writel(regval, reg);
841 break;
842
843 case PIN_CONFIG_BIAS_PULL_DOWN:
844 if (arg != 1) {
845 dev_dbg(pctldev->dev, "%s: arg %u out of range\n",
846 __func__, arg);
847 return -EINVAL;
848 }
849
850 regval = readl(reg);
851 regval &= ~(arg << ARTPEC6_PINMUX_UDC0_SHIFT);
852 regval &= ~ARTPEC6_PINMUX_UDC1_MASK; /* Enable */
853 writel(regval, reg);
854 break;
855
856 case PIN_CONFIG_DRIVE_STRENGTH:
857 drive = artpec6_pconf_drive_mA_to_field(arg);
858 if (drive < 0) {
859 dev_dbg(pctldev->dev, "%s: arg %u out of range\n",
860 __func__, arg);
861 return -EINVAL;
862 }
863
864 regval = readl(reg);
865 regval &= ~ARTPEC6_PINMUX_DRV_MASK;
866 regval |= (drive << ARTPEC6_PINMUX_DRV_SHIFT);
867 writel(regval, reg);
868 break;
869
870 default:
871 dev_dbg(pmx->dev, "parameter not supported\n");
872 return -ENOTSUPP;
873 }
874 }
875
876 return 0;
877 }
878
artpec6_pconf_group_set(struct pinctrl_dev * pctldev,unsigned int group,unsigned long * configs,unsigned int num_configs)879 static int artpec6_pconf_group_set(struct pinctrl_dev *pctldev,
880 unsigned int group, unsigned long *configs,
881 unsigned int num_configs)
882 {
883 unsigned int num_pins, current_pin;
884 int ret;
885
886 dev_dbg(pctldev->dev, "setting group %s configuration\n",
887 artpec6_get_group_name(pctldev, group));
888
889 num_pins = artpec6_pin_groups[group].num_pins;
890
891 for (current_pin = 0; current_pin < num_pins; current_pin++) {
892 ret = artpec6_pconf_set(pctldev,
893 artpec6_pin_groups[group].pins[current_pin],
894 configs, num_configs);
895
896 if (ret < 0)
897 return ret;
898 }
899
900 return 0;
901 }
902
903 static const struct pinconf_ops artpec6_pconf_ops = {
904 .is_generic = true,
905 .pin_config_get = artpec6_pconf_get,
906 .pin_config_set = artpec6_pconf_set,
907 .pin_config_group_set = artpec6_pconf_group_set,
908 };
909
910 static struct pinctrl_desc artpec6_desc = {
911 .name = "artpec6-pinctrl",
912 .owner = THIS_MODULE,
913 .pins = artpec6_pins,
914 .npins = ARRAY_SIZE(artpec6_pins),
915 .pctlops = &artpec6_pctrl_ops,
916 .pmxops = &artpec6_pmx_ops,
917 .confops = &artpec6_pconf_ops,
918 };
919
920 /* The reset values say 4mA, but we want 8mA as default. */
artpec6_pmx_reset(struct artpec6_pmx * pmx)921 static void artpec6_pmx_reset(struct artpec6_pmx *pmx)
922 {
923 void __iomem *base = pmx->base;
924 int i;
925
926 for (i = 0; i < ARTPEC6_LAST_PIN; i++) {
927 u32 val;
928
929 val = readl_relaxed(base + artpec6_pmx_reg_offset(i));
930 val &= ~ARTPEC6_PINMUX_DRV_MASK;
931 val |= ARTPEC6_DRIVE_8mA_SET << ARTPEC6_PINMUX_DRV_SHIFT;
932 writel_relaxed(val, base + artpec6_pmx_reg_offset(i));
933 }
934 }
935
artpec6_pmx_probe(struct platform_device * pdev)936 static int artpec6_pmx_probe(struct platform_device *pdev)
937 {
938 struct artpec6_pmx *pmx;
939
940 pmx = devm_kzalloc(&pdev->dev, sizeof(*pmx), GFP_KERNEL);
941 if (!pmx)
942 return -ENOMEM;
943
944 pmx->dev = &pdev->dev;
945
946 pmx->base = devm_platform_ioremap_resource(pdev, 0);
947
948 if (IS_ERR(pmx->base))
949 return PTR_ERR(pmx->base);
950
951 artpec6_pmx_reset(pmx);
952
953 pmx->pins = artpec6_pins;
954 pmx->num_pins = ARRAY_SIZE(artpec6_pins);
955 pmx->functions = artpec6_pmx_functions;
956 pmx->num_functions = ARRAY_SIZE(artpec6_pmx_functions);
957 pmx->pin_groups = artpec6_pin_groups;
958 pmx->num_pin_groups = ARRAY_SIZE(artpec6_pin_groups);
959 pmx->pctl = pinctrl_register(&artpec6_desc, &pdev->dev, pmx);
960
961 if (IS_ERR(pmx->pctl)) {
962 dev_err(&pdev->dev, "could not register pinctrl driver\n");
963 return PTR_ERR(pmx->pctl);
964 }
965
966 platform_set_drvdata(pdev, pmx);
967
968 dev_info(&pdev->dev, "initialised Axis ARTPEC-6 pinctrl driver\n");
969
970 return 0;
971 }
972
artpec6_pmx_remove(struct platform_device * pdev)973 static int artpec6_pmx_remove(struct platform_device *pdev)
974 {
975 struct artpec6_pmx *pmx = platform_get_drvdata(pdev);
976
977 pinctrl_unregister(pmx->pctl);
978
979 return 0;
980 }
981
982 static const struct of_device_id artpec6_pinctrl_match[] = {
983 { .compatible = "axis,artpec6-pinctrl" },
984 {},
985 };
986
987 static struct platform_driver artpec6_pmx_driver = {
988 .driver = {
989 .name = "artpec6-pinctrl",
990 .of_match_table = artpec6_pinctrl_match,
991 },
992 .probe = artpec6_pmx_probe,
993 .remove = artpec6_pmx_remove,
994 };
995
artpec6_pmx_init(void)996 static int __init artpec6_pmx_init(void)
997 {
998 return platform_driver_register(&artpec6_pmx_driver);
999 }
1000 arch_initcall(artpec6_pmx_init);
1001