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Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux...
[linux/fpc-iii.git] / drivers / pinctrl / pinctrl-st.c
blobcab66c64149fc103aedad05784e46a35e95fccd1
1 /*
2 * Copyright (C) 2013 STMicroelectronics (R&D) Limited.
3 * Authors:
4 * Srinivas Kandagatla <srinivas.kandagatla@st.com>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10
11 #include <linux/init.h>
12 #include <linux/module.h>
13 #include <linux/slab.h>
14 #include <linux/err.h>
15 #include <linux/io.h>
16 #include <linux/of.h>
17 #include <linux/of_irq.h>
18 #include <linux/of_gpio.h>
19 #include <linux/of_address.h>
20 #include <linux/regmap.h>
21 #include <linux/mfd/syscon.h>
22 #include <linux/pinctrl/pinctrl.h>
23 #include <linux/pinctrl/pinmux.h>
24 #include <linux/pinctrl/pinconf.h>
25 #include <linux/platform_device.h>
26 #include "core.h"
27
28 /* PIO Block registers */
29 /* PIO output */
30 #define REG_PIO_POUT 0x00
31 /* Set bits of POUT */
32 #define REG_PIO_SET_POUT 0x04
33 /* Clear bits of POUT */
34 #define REG_PIO_CLR_POUT 0x08
35 /* PIO input */
36 #define REG_PIO_PIN 0x10
37 /* PIO configuration */
38 #define REG_PIO_PC(n) (0x20 + (n) * 0x10)
39 /* Set bits of PC[2:0] */
40 #define REG_PIO_SET_PC(n) (0x24 + (n) * 0x10)
41 /* Clear bits of PC[2:0] */
42 #define REG_PIO_CLR_PC(n) (0x28 + (n) * 0x10)
43 /* PIO input comparison */
44 #define REG_PIO_PCOMP 0x50
45 /* Set bits of PCOMP */
46 #define REG_PIO_SET_PCOMP 0x54
47 /* Clear bits of PCOMP */
48 #define REG_PIO_CLR_PCOMP 0x58
49 /* PIO input comparison mask */
50 #define REG_PIO_PMASK 0x60
51 /* Set bits of PMASK */
52 #define REG_PIO_SET_PMASK 0x64
53 /* Clear bits of PMASK */
54 #define REG_PIO_CLR_PMASK 0x68
55
56 #define ST_GPIO_DIRECTION_BIDIR 0x1
57 #define ST_GPIO_DIRECTION_OUT 0x2
58 #define ST_GPIO_DIRECTION_IN 0x4
59
60 /**
61 * Packed style retime configuration.
62 * There are two registers cfg0 and cfg1 in this style for each bank.
63 * Each field in this register is 8 bit corresponding to 8 pins in the bank.
64 */
65 #define RT_P_CFGS_PER_BANK 2
66 #define RT_P_CFG0_CLK1NOTCLK0_FIELD(reg) REG_FIELD(reg, 0, 7)
67 #define RT_P_CFG0_DELAY_0_FIELD(reg) REG_FIELD(reg, 16, 23)
68 #define RT_P_CFG0_DELAY_1_FIELD(reg) REG_FIELD(reg, 24, 31)
69 #define RT_P_CFG1_INVERTCLK_FIELD(reg) REG_FIELD(reg, 0, 7)
70 #define RT_P_CFG1_RETIME_FIELD(reg) REG_FIELD(reg, 8, 15)
71 #define RT_P_CFG1_CLKNOTDATA_FIELD(reg) REG_FIELD(reg, 16, 23)
72 #define RT_P_CFG1_DOUBLE_EDGE_FIELD(reg) REG_FIELD(reg, 24, 31)
73
74 /**
75 * Dedicated style retime Configuration register
76 * each register is dedicated per pin.
77 */
78 #define RT_D_CFGS_PER_BANK 8
79 #define RT_D_CFG_CLK_SHIFT 0
80 #define RT_D_CFG_CLK_MASK (0x3 << 0)
81 #define RT_D_CFG_CLKNOTDATA_SHIFT 2
82 #define RT_D_CFG_CLKNOTDATA_MASK BIT(2)
83 #define RT_D_CFG_DELAY_SHIFT 3
84 #define RT_D_CFG_DELAY_MASK (0xf << 3)
85 #define RT_D_CFG_DELAY_INNOTOUT_SHIFT 7
86 #define RT_D_CFG_DELAY_INNOTOUT_MASK BIT(7)
87 #define RT_D_CFG_DOUBLE_EDGE_SHIFT 8
88 #define RT_D_CFG_DOUBLE_EDGE_MASK BIT(8)
89 #define RT_D_CFG_INVERTCLK_SHIFT 9
90 #define RT_D_CFG_INVERTCLK_MASK BIT(9)
91 #define RT_D_CFG_RETIME_SHIFT 10
92 #define RT_D_CFG_RETIME_MASK BIT(10)
93
94 /*
95 * Pinconf is represented in an opaque unsigned long variable.
96 * Below is the bit allocation details for each possible configuration.
97 * All the bit fields can be encapsulated into four variables
98 * (direction, retime-type, retime-clk, retime-delay)
99 *
100 * +----------------+
101 *[31:28]| reserved-3 |
102 * +----------------+-------------
103 *[27] | oe | |
104 * +----------------+ v
105 *[26] | pu | [Direction ]
106 * +----------------+ ^
107 *[25] | od | |
108 * +----------------+-------------
109 *[24] | reserved-2 |
110 * +----------------+-------------
111 *[23] | retime | |
112 * +----------------+ |
113 *[22] | retime-invclk | |
114 * +----------------+ v
115 *[21] |retime-clknotdat| [Retime-type ]
116 * +----------------+ ^
117 *[20] | retime-de | |
118 * +----------------+-------------
119 *[19:18]| retime-clk |------>[Retime-Clk ]
120 * +----------------+
121 *[17:16]| reserved-1 |
122 * +----------------+
123 *[15..0]| retime-delay |------>[Retime Delay]
124 * +----------------+
125 */
126
127 #define ST_PINCONF_UNPACK(conf, param)\
128 ((conf >> ST_PINCONF_ ##param ##_SHIFT) \
129 & ST_PINCONF_ ##param ##_MASK)
130
131 #define ST_PINCONF_PACK(conf, val, param) (conf |=\
132 ((val & ST_PINCONF_ ##param ##_MASK) << \
133 ST_PINCONF_ ##param ##_SHIFT))
134
135 /* Output enable */
136 #define ST_PINCONF_OE_MASK 0x1
137 #define ST_PINCONF_OE_SHIFT 27
138 #define ST_PINCONF_OE BIT(27)
139 #define ST_PINCONF_UNPACK_OE(conf) ST_PINCONF_UNPACK(conf, OE)
140 #define ST_PINCONF_PACK_OE(conf) ST_PINCONF_PACK(conf, 1, OE)
141
142 /* Pull Up */
143 #define ST_PINCONF_PU_MASK 0x1
144 #define ST_PINCONF_PU_SHIFT 26
145 #define ST_PINCONF_PU BIT(26)
146 #define ST_PINCONF_UNPACK_PU(conf) ST_PINCONF_UNPACK(conf, PU)
147 #define ST_PINCONF_PACK_PU(conf) ST_PINCONF_PACK(conf, 1, PU)
148
149 /* Open Drain */
150 #define ST_PINCONF_OD_MASK 0x1
151 #define ST_PINCONF_OD_SHIFT 25
152 #define ST_PINCONF_OD BIT(25)
153 #define ST_PINCONF_UNPACK_OD(conf) ST_PINCONF_UNPACK(conf, OD)
154 #define ST_PINCONF_PACK_OD(conf) ST_PINCONF_PACK(conf, 1, OD)
155
156 #define ST_PINCONF_RT_MASK 0x1
157 #define ST_PINCONF_RT_SHIFT 23
158 #define ST_PINCONF_RT BIT(23)
159 #define ST_PINCONF_UNPACK_RT(conf) ST_PINCONF_UNPACK(conf, RT)
160 #define ST_PINCONF_PACK_RT(conf) ST_PINCONF_PACK(conf, 1, RT)
161
162 #define ST_PINCONF_RT_INVERTCLK_MASK 0x1
163 #define ST_PINCONF_RT_INVERTCLK_SHIFT 22
164 #define ST_PINCONF_RT_INVERTCLK BIT(22)
165 #define ST_PINCONF_UNPACK_RT_INVERTCLK(conf) \
166 ST_PINCONF_UNPACK(conf, RT_INVERTCLK)
167 #define ST_PINCONF_PACK_RT_INVERTCLK(conf) \
168 ST_PINCONF_PACK(conf, 1, RT_INVERTCLK)
169
170 #define ST_PINCONF_RT_CLKNOTDATA_MASK 0x1
171 #define ST_PINCONF_RT_CLKNOTDATA_SHIFT 21
172 #define ST_PINCONF_RT_CLKNOTDATA BIT(21)
173 #define ST_PINCONF_UNPACK_RT_CLKNOTDATA(conf) \
174 ST_PINCONF_UNPACK(conf, RT_CLKNOTDATA)
175 #define ST_PINCONF_PACK_RT_CLKNOTDATA(conf) \
176 ST_PINCONF_PACK(conf, 1, RT_CLKNOTDATA)
177
178 #define ST_PINCONF_RT_DOUBLE_EDGE_MASK 0x1
179 #define ST_PINCONF_RT_DOUBLE_EDGE_SHIFT 20
180 #define ST_PINCONF_RT_DOUBLE_EDGE BIT(20)
181 #define ST_PINCONF_UNPACK_RT_DOUBLE_EDGE(conf) \
182 ST_PINCONF_UNPACK(conf, RT_DOUBLE_EDGE)
183 #define ST_PINCONF_PACK_RT_DOUBLE_EDGE(conf) \
184 ST_PINCONF_PACK(conf, 1, RT_DOUBLE_EDGE)
185
186 #define ST_PINCONF_RT_CLK_MASK 0x3
187 #define ST_PINCONF_RT_CLK_SHIFT 18
188 #define ST_PINCONF_RT_CLK BIT(18)
189 #define ST_PINCONF_UNPACK_RT_CLK(conf) ST_PINCONF_UNPACK(conf, RT_CLK)
190 #define ST_PINCONF_PACK_RT_CLK(conf, val) ST_PINCONF_PACK(conf, val, RT_CLK)
191
192 /* RETIME_DELAY in Pico Secs */
193 #define ST_PINCONF_RT_DELAY_MASK 0xffff
194 #define ST_PINCONF_RT_DELAY_SHIFT 0
195 #define ST_PINCONF_UNPACK_RT_DELAY(conf) ST_PINCONF_UNPACK(conf, RT_DELAY)
196 #define ST_PINCONF_PACK_RT_DELAY(conf, val) \
197 ST_PINCONF_PACK(conf, val, RT_DELAY)
198
199 #define ST_GPIO_PINS_PER_BANK (8)
200 #define OF_GPIO_ARGS_MIN (4)
201 #define OF_RT_ARGS_MIN (2)
202
203 #define gpio_range_to_bank(chip) \
204 container_of(chip, struct st_gpio_bank, range)
205
206 #define pc_to_bank(pc) \
207 container_of(pc, struct st_gpio_bank, pc)
208
209 enum st_retime_style {
210 st_retime_style_none,
211 st_retime_style_packed,
212 st_retime_style_dedicated,
213 };
214
215 struct st_retime_dedicated {
216 struct regmap_field *rt[ST_GPIO_PINS_PER_BANK];
217 };
218
219 struct st_retime_packed {
220 struct regmap_field *clk1notclk0;
221 struct regmap_field *delay_0;
222 struct regmap_field *delay_1;
223 struct regmap_field *invertclk;
224 struct regmap_field *retime;
225 struct regmap_field *clknotdata;
226 struct regmap_field *double_edge;
227 };
228
229 struct st_pio_control {
230 u32 rt_pin_mask;
231 struct regmap_field *alt, *oe, *pu, *od;
232 /* retiming */
233 union {
234 struct st_retime_packed rt_p;
235 struct st_retime_dedicated rt_d;
236 } rt;
237 };
238
239 struct st_pctl_data {
240 const enum st_retime_style rt_style;
241 const unsigned int *input_delays;
242 const int ninput_delays;
243 const unsigned int *output_delays;
244 const int noutput_delays;
245 /* register offset information */
246 const int alt, oe, pu, od, rt;
247 };
248
249 struct st_pinconf {
250 int pin;
251 const char *name;
252 unsigned long config;
253 int altfunc;
254 };
255
256 struct st_pmx_func {
257 const char *name;
258 const char **groups;
259 unsigned ngroups;
260 };
261
262 struct st_pctl_group {
263 const char *name;
264 unsigned int *pins;
265 unsigned npins;
266 struct st_pinconf *pin_conf;
267 };
268
269 /*
270 * Edge triggers are not supported at hardware level, it is supported by
271 * software by exploiting the level trigger support in hardware.
272 * Software uses a virtual register (EDGE_CONF) for edge trigger configuration
273 * of each gpio pin in a GPIO bank.
274 *
275 * Each bank has a 32 bit EDGE_CONF register which is divided in to 8 parts of
276 * 4-bits. Each 4-bit space is allocated for each pin in a gpio bank.
277 *
278 * bit allocation per pin is:
279 * Bits: [0 - 3] | [4 - 7] [8 - 11] ... ... ... ... [ 28 - 31]
280 * --------------------------------------------------------
281 * | pin-0 | pin-2 | pin-3 | ... ... ... ... | pin -7 |
282 * --------------------------------------------------------
283 *
284 * A pin can have one of following the values in its edge configuration field.
285 *
286 * ------- ----------------------------
287 * [0-3] - Description
288 * ------- ----------------------------
289 * 0000 - No edge IRQ.
290 * 0001 - Falling edge IRQ.
291 * 0010 - Rising edge IRQ.
292 * 0011 - Rising and Falling edge IRQ.
293 * ------- ----------------------------
294 */
295
296 #define ST_IRQ_EDGE_CONF_BITS_PER_PIN 4
297 #define ST_IRQ_EDGE_MASK 0xf
298 #define ST_IRQ_EDGE_FALLING BIT(0)
299 #define ST_IRQ_EDGE_RISING BIT(1)
300 #define ST_IRQ_EDGE_BOTH (BIT(0) | BIT(1))
301
302 #define ST_IRQ_RISING_EDGE_CONF(pin) \
303 (ST_IRQ_EDGE_RISING << (pin * ST_IRQ_EDGE_CONF_BITS_PER_PIN))
304
305 #define ST_IRQ_FALLING_EDGE_CONF(pin) \
306 (ST_IRQ_EDGE_FALLING << (pin * ST_IRQ_EDGE_CONF_BITS_PER_PIN))
307
308 #define ST_IRQ_BOTH_EDGE_CONF(pin) \
309 (ST_IRQ_EDGE_BOTH << (pin * ST_IRQ_EDGE_CONF_BITS_PER_PIN))
310
311 #define ST_IRQ_EDGE_CONF(conf, pin) \
312 (conf >> (pin * ST_IRQ_EDGE_CONF_BITS_PER_PIN) & ST_IRQ_EDGE_MASK)
313
314 struct st_gpio_bank {
315 struct gpio_chip gpio_chip;
316 struct pinctrl_gpio_range range;
317 void __iomem *base;
318 struct st_pio_control pc;
319 unsigned long irq_edge_conf;
320 spinlock_t lock;
321 };
322
323 struct st_pinctrl {
324 struct device *dev;
325 struct pinctrl_dev *pctl;
326 struct st_gpio_bank *banks;
327 int nbanks;
328 struct st_pmx_func *functions;
329 int nfunctions;
330 struct st_pctl_group *groups;
331 int ngroups;
332 struct regmap *regmap;
333 const struct st_pctl_data *data;
334 void __iomem *irqmux_base;
335 };
336
337 /* SOC specific data */
338 /* STiH415 data */
339 static const unsigned int stih415_input_delays[] = {0, 500, 1000, 1500};
340 static const unsigned int stih415_output_delays[] = {0, 1000, 2000, 3000};
341
342 #define STIH415_PCTRL_COMMON_DATA \
343 .rt_style = st_retime_style_packed, \
344 .input_delays = stih415_input_delays, \
345 .ninput_delays = ARRAY_SIZE(stih415_input_delays), \
346 .output_delays = stih415_output_delays, \
347 .noutput_delays = ARRAY_SIZE(stih415_output_delays)
348
349 static const struct st_pctl_data stih415_sbc_data = {
350 STIH415_PCTRL_COMMON_DATA,
351 .alt = 0, .oe = 5, .pu = 7, .od = 9, .rt = 16,
352 };
353
354 static const struct st_pctl_data stih415_front_data = {
355 STIH415_PCTRL_COMMON_DATA,
356 .alt = 0, .oe = 8, .pu = 10, .od = 12, .rt = 16,
357 };
358
359 static const struct st_pctl_data stih415_rear_data = {
360 STIH415_PCTRL_COMMON_DATA,
361 .alt = 0, .oe = 6, .pu = 8, .od = 10, .rt = 38,
362 };
363
364 static const struct st_pctl_data stih415_left_data = {
365 STIH415_PCTRL_COMMON_DATA,
366 .alt = 0, .oe = 3, .pu = 4, .od = 5, .rt = 6,
367 };
368
369 static const struct st_pctl_data stih415_right_data = {
370 STIH415_PCTRL_COMMON_DATA,
371 .alt = 0, .oe = 5, .pu = 7, .od = 9, .rt = 11,
372 };
373
374 /* STiH416 data */
375 static const unsigned int stih416_delays[] = {0, 300, 500, 750, 1000, 1250,
376 1500, 1750, 2000, 2250, 2500, 2750, 3000, 3250 };
377
378 static const struct st_pctl_data stih416_data = {
379 .rt_style = st_retime_style_dedicated,
380 .input_delays = stih416_delays,
381 .ninput_delays = ARRAY_SIZE(stih416_delays),
382 .output_delays = stih416_delays,
383 .noutput_delays = ARRAY_SIZE(stih416_delays),
384 .alt = 0, .oe = 40, .pu = 50, .od = 60, .rt = 100,
385 };
386
387 static const struct st_pctl_data stih407_flashdata = {
388 .rt_style = st_retime_style_none,
389 .input_delays = stih416_delays,
390 .ninput_delays = ARRAY_SIZE(stih416_delays),
391 .output_delays = stih416_delays,
392 .noutput_delays = ARRAY_SIZE(stih416_delays),
393 .alt = 0,
394 .oe = -1, /* Not Available */
395 .pu = -1, /* Not Available */
396 .od = 60,
397 .rt = 100,
398 };
399
400 static struct st_pio_control *st_get_pio_control(
401 struct pinctrl_dev *pctldev, int pin)
402 {
403 struct pinctrl_gpio_range *range =
404 pinctrl_find_gpio_range_from_pin(pctldev, pin);
405 struct st_gpio_bank *bank = gpio_range_to_bank(range);
406
407 return &bank->pc;
408 }
409
410 /* Low level functions.. */
411 static inline int st_gpio_bank(int gpio)
412 {
413 return gpio/ST_GPIO_PINS_PER_BANK;
414 }
415
416 static inline int st_gpio_pin(int gpio)
417 {
418 return gpio%ST_GPIO_PINS_PER_BANK;
419 }
420
421 static void st_pinconf_set_config(struct st_pio_control *pc,
422 int pin, unsigned long config)
423 {
424 struct regmap_field *output_enable = pc->oe;
425 struct regmap_field *pull_up = pc->pu;
426 struct regmap_field *open_drain = pc->od;
427 unsigned int oe_value, pu_value, od_value;
428 unsigned long mask = BIT(pin);
429
430 if (output_enable) {
431 regmap_field_read(output_enable, &oe_value);
432 oe_value &= ~mask;
433 if (config & ST_PINCONF_OE)
434 oe_value |= mask;
435 regmap_field_write(output_enable, oe_value);
436 }
437
438 if (pull_up) {
439 regmap_field_read(pull_up, &pu_value);
440 pu_value &= ~mask;
441 if (config & ST_PINCONF_PU)
442 pu_value |= mask;
443 regmap_field_write(pull_up, pu_value);
444 }
445
446 if (open_drain) {
447 regmap_field_read(open_drain, &od_value);
448 od_value &= ~mask;
449 if (config & ST_PINCONF_OD)
450 od_value |= mask;
451 regmap_field_write(open_drain, od_value);
452 }
453 }
454
455 static void st_pctl_set_function(struct st_pio_control *pc,
456 int pin_id, int function)
457 {
458 struct regmap_field *alt = pc->alt;
459 unsigned int val;
460 int pin = st_gpio_pin(pin_id);
461 int offset = pin * 4;
462
463 if (!alt)
464 return;
465
466 regmap_field_read(alt, &val);
467 val &= ~(0xf << offset);
468 val |= function << offset;
469 regmap_field_write(alt, val);
470 }
471
472 static unsigned int st_pctl_get_pin_function(struct st_pio_control *pc, int pin)
473 {
474 struct regmap_field *alt = pc->alt;
475 unsigned int val;
476 int offset = pin * 4;
477
478 if (!alt)
479 return 0;
480
481 regmap_field_read(alt, &val);
482
483 return (val >> offset) & 0xf;
484 }
485
486 static unsigned long st_pinconf_delay_to_bit(unsigned int delay,
487 const struct st_pctl_data *data, unsigned long config)
488 {
489 const unsigned int *delay_times;
490 int num_delay_times, i, closest_index = -1;
491 unsigned int closest_divergence = UINT_MAX;
492
493 if (ST_PINCONF_UNPACK_OE(config)) {
494 delay_times = data->output_delays;
495 num_delay_times = data->noutput_delays;
496 } else {
497 delay_times = data->input_delays;
498 num_delay_times = data->ninput_delays;
499 }
500
501 for (i = 0; i < num_delay_times; i++) {
502 unsigned int divergence = abs(delay - delay_times[i]);
503
504 if (divergence == 0)
505 return i;
506
507 if (divergence < closest_divergence) {
508 closest_divergence = divergence;
509 closest_index = i;
510 }
511 }
512
513 pr_warn("Attempt to set delay %d, closest available %d\n",
514 delay, delay_times[closest_index]);
515
516 return closest_index;
517 }
518
519 static unsigned long st_pinconf_bit_to_delay(unsigned int index,
520 const struct st_pctl_data *data, unsigned long output)
521 {
522 const unsigned int *delay_times;
523 int num_delay_times;
524
525 if (output) {
526 delay_times = data->output_delays;
527 num_delay_times = data->noutput_delays;
528 } else {
529 delay_times = data->input_delays;
530 num_delay_times = data->ninput_delays;
531 }
532
533 if (index < num_delay_times) {
534 return delay_times[index];
535 } else {
536 pr_warn("Delay not found in/out delay list\n");
537 return 0;
538 }
539 }
540
541 static void st_regmap_field_bit_set_clear_pin(struct regmap_field *field,
542 int enable, int pin)
543 {
544 unsigned int val = 0;
545
546 regmap_field_read(field, &val);
547 if (enable)
548 val |= BIT(pin);
549 else
550 val &= ~BIT(pin);
551 regmap_field_write(field, val);
552 }
553
554 static void st_pinconf_set_retime_packed(struct st_pinctrl *info,
555 struct st_pio_control *pc, unsigned long config, int pin)
556 {
557 const struct st_pctl_data *data = info->data;
558 struct st_retime_packed *rt_p = &pc->rt.rt_p;
559 unsigned int delay;
560
561 st_regmap_field_bit_set_clear_pin(rt_p->clk1notclk0,
562 ST_PINCONF_UNPACK_RT_CLK(config), pin);
563
564 st_regmap_field_bit_set_clear_pin(rt_p->clknotdata,
565 ST_PINCONF_UNPACK_RT_CLKNOTDATA(config), pin);
566
567 st_regmap_field_bit_set_clear_pin(rt_p->double_edge,
568 ST_PINCONF_UNPACK_RT_DOUBLE_EDGE(config), pin);
569
570 st_regmap_field_bit_set_clear_pin(rt_p->invertclk,
571 ST_PINCONF_UNPACK_RT_INVERTCLK(config), pin);
572
573 st_regmap_field_bit_set_clear_pin(rt_p->retime,
574 ST_PINCONF_UNPACK_RT(config), pin);
575
576 delay = st_pinconf_delay_to_bit(ST_PINCONF_UNPACK_RT_DELAY(config),
577 data, config);
578 /* 2 bit delay, lsb */
579 st_regmap_field_bit_set_clear_pin(rt_p->delay_0, delay & 0x1, pin);
580 /* 2 bit delay, msb */
581 st_regmap_field_bit_set_clear_pin(rt_p->delay_1, delay & 0x2, pin);
582
583 }
584
585 static void st_pinconf_set_retime_dedicated(struct st_pinctrl *info,
586 struct st_pio_control *pc, unsigned long config, int pin)
587 {
588 int input = ST_PINCONF_UNPACK_OE(config) ? 0 : 1;
589 int clk = ST_PINCONF_UNPACK_RT_CLK(config);
590 int clknotdata = ST_PINCONF_UNPACK_RT_CLKNOTDATA(config);
591 int double_edge = ST_PINCONF_UNPACK_RT_DOUBLE_EDGE(config);
592 int invertclk = ST_PINCONF_UNPACK_RT_INVERTCLK(config);
593 int retime = ST_PINCONF_UNPACK_RT(config);
594
595 unsigned long delay = st_pinconf_delay_to_bit(
596 ST_PINCONF_UNPACK_RT_DELAY(config),
597 info->data, config);
598 struct st_retime_dedicated *rt_d = &pc->rt.rt_d;
599
600 unsigned long retime_config =
601 ((clk) << RT_D_CFG_CLK_SHIFT) |
602 ((delay) << RT_D_CFG_DELAY_SHIFT) |
603 ((input) << RT_D_CFG_DELAY_INNOTOUT_SHIFT) |
604 ((retime) << RT_D_CFG_RETIME_SHIFT) |
605 ((clknotdata) << RT_D_CFG_CLKNOTDATA_SHIFT) |
606 ((invertclk) << RT_D_CFG_INVERTCLK_SHIFT) |
607 ((double_edge) << RT_D_CFG_DOUBLE_EDGE_SHIFT);
608
609 regmap_field_write(rt_d->rt[pin], retime_config);
610 }
611
612 static void st_pinconf_get_direction(struct st_pio_control *pc,
613 int pin, unsigned long *config)
614 {
615 unsigned int oe_value, pu_value, od_value;
616
617 if (pc->oe) {
618 regmap_field_read(pc->oe, &oe_value);
619 if (oe_value & BIT(pin))
620 ST_PINCONF_PACK_OE(*config);
621 }
622
623 if (pc->pu) {
624 regmap_field_read(pc->pu, &pu_value);
625 if (pu_value & BIT(pin))
626 ST_PINCONF_PACK_PU(*config);
627 }
628
629 if (pc->od) {
630 regmap_field_read(pc->od, &od_value);
631 if (od_value & BIT(pin))
632 ST_PINCONF_PACK_OD(*config);
633 }
634 }
635
636 static int st_pinconf_get_retime_packed(struct st_pinctrl *info,
637 struct st_pio_control *pc, int pin, unsigned long *config)
638 {
639 const struct st_pctl_data *data = info->data;
640 struct st_retime_packed *rt_p = &pc->rt.rt_p;
641 unsigned int delay_bits, delay, delay0, delay1, val;
642 int output = ST_PINCONF_UNPACK_OE(*config);
643
644 if (!regmap_field_read(rt_p->retime, &val) && (val & BIT(pin)))
645 ST_PINCONF_PACK_RT(*config);
646
647 if (!regmap_field_read(rt_p->clk1notclk0, &val) && (val & BIT(pin)))
648 ST_PINCONF_PACK_RT_CLK(*config, 1);
649
650 if (!regmap_field_read(rt_p->clknotdata, &val) && (val & BIT(pin)))
651 ST_PINCONF_PACK_RT_CLKNOTDATA(*config);
652
653 if (!regmap_field_read(rt_p->double_edge, &val) && (val & BIT(pin)))
654 ST_PINCONF_PACK_RT_DOUBLE_EDGE(*config);
655
656 if (!regmap_field_read(rt_p->invertclk, &val) && (val & BIT(pin)))
657 ST_PINCONF_PACK_RT_INVERTCLK(*config);
658
659 regmap_field_read(rt_p->delay_0, &delay0);
660 regmap_field_read(rt_p->delay_1, &delay1);
661 delay_bits = (((delay1 & BIT(pin)) ? 1 : 0) << 1) |
662 (((delay0 & BIT(pin)) ? 1 : 0));
663 delay = st_pinconf_bit_to_delay(delay_bits, data, output);
664 ST_PINCONF_PACK_RT_DELAY(*config, delay);
665
666 return 0;
667 }
668
669 static int st_pinconf_get_retime_dedicated(struct st_pinctrl *info,
670 struct st_pio_control *pc, int pin, unsigned long *config)
671 {
672 unsigned int value;
673 unsigned long delay_bits, delay, rt_clk;
674 int output = ST_PINCONF_UNPACK_OE(*config);
675 struct st_retime_dedicated *rt_d = &pc->rt.rt_d;
676
677 regmap_field_read(rt_d->rt[pin], &value);
678
679 rt_clk = (value & RT_D_CFG_CLK_MASK) >> RT_D_CFG_CLK_SHIFT;
680 ST_PINCONF_PACK_RT_CLK(*config, rt_clk);
681
682 delay_bits = (value & RT_D_CFG_DELAY_MASK) >> RT_D_CFG_DELAY_SHIFT;
683 delay = st_pinconf_bit_to_delay(delay_bits, info->data, output);
684 ST_PINCONF_PACK_RT_DELAY(*config, delay);
685
686 if (value & RT_D_CFG_CLKNOTDATA_MASK)
687 ST_PINCONF_PACK_RT_CLKNOTDATA(*config);
688
689 if (value & RT_D_CFG_DOUBLE_EDGE_MASK)
690 ST_PINCONF_PACK_RT_DOUBLE_EDGE(*config);
691
692 if (value & RT_D_CFG_INVERTCLK_MASK)
693 ST_PINCONF_PACK_RT_INVERTCLK(*config);
694
695 if (value & RT_D_CFG_RETIME_MASK)
696 ST_PINCONF_PACK_RT(*config);
697
698 return 0;
699 }
700
701 /* GPIO related functions */
702
703 static inline void __st_gpio_set(struct st_gpio_bank *bank,
704 unsigned offset, int value)
705 {
706 if (value)
707 writel(BIT(offset), bank->base + REG_PIO_SET_POUT);
708 else
709 writel(BIT(offset), bank->base + REG_PIO_CLR_POUT);
710 }
711
712 static void st_gpio_direction(struct st_gpio_bank *bank,
713 unsigned int gpio, unsigned int direction)
714 {
715 int offset = st_gpio_pin(gpio);
716 int i = 0;
717 /**
718 * There are three configuration registers (PIOn_PC0, PIOn_PC1
719 * and PIOn_PC2) for each port. These are used to configure the
720 * PIO port pins. Each pin can be configured as an input, output,
721 * bidirectional, or alternative function pin. Three bits, one bit
722 * from each of the three registers, configure the corresponding bit of
723 * the port. Valid bit settings is:
724 *
725 * PC2 PC1 PC0 Direction.
726 * 0 0 0 [Input Weak pull-up]
727 * 0 0 or 1 1 [Bidirection]
728 * 0 1 0 [Output]
729 * 1 0 0 [Input]
730 *
731 * PIOn_SET_PC and PIOn_CLR_PC registers are used to set and clear bits
732 * individually.
733 */
734 for (i = 0; i <= 2; i++) {
735 if (direction & BIT(i))
736 writel(BIT(offset), bank->base + REG_PIO_SET_PC(i));
737 else
738 writel(BIT(offset), bank->base + REG_PIO_CLR_PC(i));
739 }
740 }
741
742 static int st_gpio_get(struct gpio_chip *chip, unsigned offset)
743 {
744 struct st_gpio_bank *bank = gpiochip_get_data(chip);
745
746 return !!(readl(bank->base + REG_PIO_PIN) & BIT(offset));
747 }
748
749 static void st_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
750 {
751 struct st_gpio_bank *bank = gpiochip_get_data(chip);
752 __st_gpio_set(bank, offset, value);
753 }
754
755 static int st_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
756 {
757 pinctrl_gpio_direction_input(chip->base + offset);
758
759 return 0;
760 }
761
762 static int st_gpio_direction_output(struct gpio_chip *chip,
763 unsigned offset, int value)
764 {
765 struct st_gpio_bank *bank = gpiochip_get_data(chip);
766
767 __st_gpio_set(bank, offset, value);
768 pinctrl_gpio_direction_output(chip->base + offset);
769
770 return 0;
771 }
772
773 static int st_gpio_get_direction(struct gpio_chip *chip, unsigned offset)
774 {
775 struct st_gpio_bank *bank = gpiochip_get_data(chip);
776 struct st_pio_control pc = bank->pc;
777 unsigned long config;
778 unsigned int direction = 0;
779 unsigned int function;
780 unsigned int value;
781 int i = 0;
782
783 /* Alternate function direction is handled by Pinctrl */
784 function = st_pctl_get_pin_function(&pc, offset);
785 if (function) {
786 st_pinconf_get_direction(&pc, offset, &config);
787 return !ST_PINCONF_UNPACK_OE(config);
788 }
789
790 /*
791 * GPIO direction is handled differently
792 * - See st_gpio_direction() above for an explanation
793 */
794 for (i = 0; i <= 2; i++) {
795 value = readl(bank->base + REG_PIO_PC(i));
796 direction |= ((value >> offset) & 0x1) << i;
797 }
798
799 return (direction == ST_GPIO_DIRECTION_IN);
800 }
801
802 static int st_gpio_xlate(struct gpio_chip *gc,
803 const struct of_phandle_args *gpiospec, u32 *flags)
804 {
805 if (WARN_ON(gc->of_gpio_n_cells < 1))
806 return -EINVAL;
807
808 if (WARN_ON(gpiospec->args_count < gc->of_gpio_n_cells))
809 return -EINVAL;
810
811 if (gpiospec->args[0] > gc->ngpio)
812 return -EINVAL;
813
814 return gpiospec->args[0];
815 }
816
817 /* Pinctrl Groups */
818 static int st_pctl_get_groups_count(struct pinctrl_dev *pctldev)
819 {
820 struct st_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
821
822 return info->ngroups;
823 }
824
825 static const char *st_pctl_get_group_name(struct pinctrl_dev *pctldev,
826 unsigned selector)
827 {
828 struct st_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
829
830 return info->groups[selector].name;
831 }
832
833 static int st_pctl_get_group_pins(struct pinctrl_dev *pctldev,
834 unsigned selector, const unsigned **pins, unsigned *npins)
835 {
836 struct st_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
837
838 if (selector >= info->ngroups)
839 return -EINVAL;
840
841 *pins = info->groups[selector].pins;
842 *npins = info->groups[selector].npins;
843
844 return 0;
845 }
846
847 static const inline struct st_pctl_group *st_pctl_find_group_by_name(
848 const struct st_pinctrl *info, const char *name)
849 {
850 int i;
851
852 for (i = 0; i < info->ngroups; i++) {
853 if (!strcmp(info->groups[i].name, name))
854 return &info->groups[i];
855 }
856
857 return NULL;
858 }
859
860 static int st_pctl_dt_node_to_map(struct pinctrl_dev *pctldev,
861 struct device_node *np, struct pinctrl_map **map, unsigned *num_maps)
862 {
863 struct st_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
864 const struct st_pctl_group *grp;
865 struct pinctrl_map *new_map;
866 struct device_node *parent;
867 int map_num, i;
868
869 grp = st_pctl_find_group_by_name(info, np->name);
870 if (!grp) {
871 dev_err(info->dev, "unable to find group for node %s\n",
872 np->name);
873 return -EINVAL;
874 }
875
876 map_num = grp->npins + 1;
877 new_map = devm_kzalloc(pctldev->dev,
878 sizeof(*new_map) * map_num, GFP_KERNEL);
879 if (!new_map)
880 return -ENOMEM;
881
882 parent = of_get_parent(np);
883 if (!parent) {
884 devm_kfree(pctldev->dev, new_map);
885 return -EINVAL;
886 }
887
888 *map = new_map;
889 *num_maps = map_num;
890 new_map[0].type = PIN_MAP_TYPE_MUX_GROUP;
891 new_map[0].data.mux.function = parent->name;
892 new_map[0].data.mux.group = np->name;
893 of_node_put(parent);
894
895 /* create config map per pin */
896 new_map++;
897 for (i = 0; i < grp->npins; i++) {
898 new_map[i].type = PIN_MAP_TYPE_CONFIGS_PIN;
899 new_map[i].data.configs.group_or_pin =
900 pin_get_name(pctldev, grp->pins[i]);
901 new_map[i].data.configs.configs = &grp->pin_conf[i].config;
902 new_map[i].data.configs.num_configs = 1;
903 }
904 dev_info(pctldev->dev, "maps: function %s group %s num %d\n",
905 (*map)->data.mux.function, grp->name, map_num);
906
907 return 0;
908 }
909
910 static void st_pctl_dt_free_map(struct pinctrl_dev *pctldev,
911 struct pinctrl_map *map, unsigned num_maps)
912 {
913 }
914
915 static struct pinctrl_ops st_pctlops = {
916 .get_groups_count = st_pctl_get_groups_count,
917 .get_group_pins = st_pctl_get_group_pins,
918 .get_group_name = st_pctl_get_group_name,
919 .dt_node_to_map = st_pctl_dt_node_to_map,
920 .dt_free_map = st_pctl_dt_free_map,
921 };
922
923 /* Pinmux */
924 static int st_pmx_get_funcs_count(struct pinctrl_dev *pctldev)
925 {
926 struct st_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
927
928 return info->nfunctions;
929 }
930
931 static const char *st_pmx_get_fname(struct pinctrl_dev *pctldev,
932 unsigned selector)
933 {
934 struct st_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
935
936 return info->functions[selector].name;
937 }
938
939 static int st_pmx_get_groups(struct pinctrl_dev *pctldev,
940 unsigned selector, const char * const **grps, unsigned * const ngrps)
941 {
942 struct st_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
943 *grps = info->functions[selector].groups;
944 *ngrps = info->functions[selector].ngroups;
945
946 return 0;
947 }
948
949 static int st_pmx_set_mux(struct pinctrl_dev *pctldev, unsigned fselector,
950 unsigned group)
951 {
952 struct st_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
953 struct st_pinconf *conf = info->groups[group].pin_conf;
954 struct st_pio_control *pc;
955 int i;
956
957 for (i = 0; i < info->groups[group].npins; i++) {
958 pc = st_get_pio_control(pctldev, conf[i].pin);
959 st_pctl_set_function(pc, conf[i].pin, conf[i].altfunc);
960 }
961
962 return 0;
963 }
964
965 static int st_pmx_set_gpio_direction(struct pinctrl_dev *pctldev,
966 struct pinctrl_gpio_range *range, unsigned gpio,
967 bool input)
968 {
969 struct st_gpio_bank *bank = gpio_range_to_bank(range);
970 /*
971 * When a PIO bank is used in its primary function mode (altfunc = 0)
972 * Output Enable (OE), Open Drain(OD), and Pull Up (PU)
973 * for the primary PIO functions are driven by the related PIO block
974 */
975 st_pctl_set_function(&bank->pc, gpio, 0);
976 st_gpio_direction(bank, gpio, input ?
977 ST_GPIO_DIRECTION_IN : ST_GPIO_DIRECTION_OUT);
978
979 return 0;
980 }
981
982 static struct pinmux_ops st_pmxops = {
983 .get_functions_count = st_pmx_get_funcs_count,
984 .get_function_name = st_pmx_get_fname,
985 .get_function_groups = st_pmx_get_groups,
986 .set_mux = st_pmx_set_mux,
987 .gpio_set_direction = st_pmx_set_gpio_direction,
988 .strict = true,
989 };
990
991 /* Pinconf */
992 static void st_pinconf_get_retime(struct st_pinctrl *info,
993 struct st_pio_control *pc, int pin, unsigned long *config)
994 {
995 if (info->data->rt_style == st_retime_style_packed)
996 st_pinconf_get_retime_packed(info, pc, pin, config);
997 else if (info->data->rt_style == st_retime_style_dedicated)
998 if ((BIT(pin) & pc->rt_pin_mask))
999 st_pinconf_get_retime_dedicated(info, pc,
1000 pin, config);
1001 }
1002
1003 static void st_pinconf_set_retime(struct st_pinctrl *info,
1004 struct st_pio_control *pc, int pin, unsigned long config)
1005 {
1006 if (info->data->rt_style == st_retime_style_packed)
1007 st_pinconf_set_retime_packed(info, pc, config, pin);
1008 else if (info->data->rt_style == st_retime_style_dedicated)
1009 if ((BIT(pin) & pc->rt_pin_mask))
1010 st_pinconf_set_retime_dedicated(info, pc,
1011 config, pin);
1012 }
1013
1014 static int st_pinconf_set(struct pinctrl_dev *pctldev, unsigned pin_id,
1015 unsigned long *configs, unsigned num_configs)
1016 {
1017 int pin = st_gpio_pin(pin_id);
1018 struct st_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
1019 struct st_pio_control *pc = st_get_pio_control(pctldev, pin_id);
1020 int i;
1021
1022 for (i = 0; i < num_configs; i++) {
1023 st_pinconf_set_config(pc, pin, configs[i]);
1024 st_pinconf_set_retime(info, pc, pin, configs[i]);
1025 } /* for each config */
1026
1027 return 0;
1028 }
1029
1030 static int st_pinconf_get(struct pinctrl_dev *pctldev,
1031 unsigned pin_id, unsigned long *config)
1032 {
1033 int pin = st_gpio_pin(pin_id);
1034 struct st_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
1035 struct st_pio_control *pc = st_get_pio_control(pctldev, pin_id);
1036
1037 *config = 0;
1038 st_pinconf_get_direction(pc, pin, config);
1039 st_pinconf_get_retime(info, pc, pin, config);
1040
1041 return 0;
1042 }
1043
1044 static void st_pinconf_dbg_show(struct pinctrl_dev *pctldev,
1045 struct seq_file *s, unsigned pin_id)
1046 {
1047 struct st_pio_control *pc;
1048 unsigned long config;
1049 unsigned int function;
1050 int offset = st_gpio_pin(pin_id);
1051 char f[16];
1052
1053 mutex_unlock(&pctldev->mutex);
1054 pc = st_get_pio_control(pctldev, pin_id);
1055 st_pinconf_get(pctldev, pin_id, &config);
1056 mutex_lock(&pctldev->mutex);
1057
1058 function = st_pctl_get_pin_function(pc, offset);
1059 if (function)
1060 snprintf(f, 10, "Alt Fn %d", function);
1061 else
1062 snprintf(f, 5, "GPIO");
1063
1064 seq_printf(s, "[OE:%d,PU:%ld,OD:%ld]\t%s\n"
1065 "\t\t[retime:%ld,invclk:%ld,clknotdat:%ld,"
1066 "de:%ld,rt-clk:%ld,rt-delay:%ld]",
1067 !st_gpio_get_direction(&pc_to_bank(pc)->gpio_chip, offset),
1068 ST_PINCONF_UNPACK_PU(config),
1069 ST_PINCONF_UNPACK_OD(config),
1070 f,
1071 ST_PINCONF_UNPACK_RT(config),
1072 ST_PINCONF_UNPACK_RT_INVERTCLK(config),
1073 ST_PINCONF_UNPACK_RT_CLKNOTDATA(config),
1074 ST_PINCONF_UNPACK_RT_DOUBLE_EDGE(config),
1075 ST_PINCONF_UNPACK_RT_CLK(config),
1076 ST_PINCONF_UNPACK_RT_DELAY(config));
1077 }
1078
1079 static struct pinconf_ops st_confops = {
1080 .pin_config_get = st_pinconf_get,
1081 .pin_config_set = st_pinconf_set,
1082 .pin_config_dbg_show = st_pinconf_dbg_show,
1083 };
1084
1085 static void st_pctl_dt_child_count(struct st_pinctrl *info,
1086 struct device_node *np)
1087 {
1088 struct device_node *child;
1089 for_each_child_of_node(np, child) {
1090 if (of_property_read_bool(child, "gpio-controller")) {
1091 info->nbanks++;
1092 } else {
1093 info->nfunctions++;
1094 info->ngroups += of_get_child_count(child);
1095 }
1096 }
1097 }
1098
1099 static int st_pctl_dt_setup_retime_packed(struct st_pinctrl *info,
1100 int bank, struct st_pio_control *pc)
1101 {
1102 struct device *dev = info->dev;
1103 struct regmap *rm = info->regmap;
1104 const struct st_pctl_data *data = info->data;
1105 /* 2 registers per bank */
1106 int reg = (data->rt + bank * RT_P_CFGS_PER_BANK) * 4;
1107 struct st_retime_packed *rt_p = &pc->rt.rt_p;
1108 /* cfg0 */
1109 struct reg_field clk1notclk0 = RT_P_CFG0_CLK1NOTCLK0_FIELD(reg);
1110 struct reg_field delay_0 = RT_P_CFG0_DELAY_0_FIELD(reg);
1111 struct reg_field delay_1 = RT_P_CFG0_DELAY_1_FIELD(reg);
1112 /* cfg1 */
1113 struct reg_field invertclk = RT_P_CFG1_INVERTCLK_FIELD(reg + 4);
1114 struct reg_field retime = RT_P_CFG1_RETIME_FIELD(reg + 4);
1115 struct reg_field clknotdata = RT_P_CFG1_CLKNOTDATA_FIELD(reg + 4);
1116 struct reg_field double_edge = RT_P_CFG1_DOUBLE_EDGE_FIELD(reg + 4);
1117
1118 rt_p->clk1notclk0 = devm_regmap_field_alloc(dev, rm, clk1notclk0);
1119 rt_p->delay_0 = devm_regmap_field_alloc(dev, rm, delay_0);
1120 rt_p->delay_1 = devm_regmap_field_alloc(dev, rm, delay_1);
1121 rt_p->invertclk = devm_regmap_field_alloc(dev, rm, invertclk);
1122 rt_p->retime = devm_regmap_field_alloc(dev, rm, retime);
1123 rt_p->clknotdata = devm_regmap_field_alloc(dev, rm, clknotdata);
1124 rt_p->double_edge = devm_regmap_field_alloc(dev, rm, double_edge);
1125
1126 if (IS_ERR(rt_p->clk1notclk0) || IS_ERR(rt_p->delay_0) ||
1127 IS_ERR(rt_p->delay_1) || IS_ERR(rt_p->invertclk) ||
1128 IS_ERR(rt_p->retime) || IS_ERR(rt_p->clknotdata) ||
1129 IS_ERR(rt_p->double_edge))
1130 return -EINVAL;
1131
1132 return 0;
1133 }
1134
1135 static int st_pctl_dt_setup_retime_dedicated(struct st_pinctrl *info,
1136 int bank, struct st_pio_control *pc)
1137 {
1138 struct device *dev = info->dev;
1139 struct regmap *rm = info->regmap;
1140 const struct st_pctl_data *data = info->data;
1141 /* 8 registers per bank */
1142 int reg_offset = (data->rt + bank * RT_D_CFGS_PER_BANK) * 4;
1143 struct st_retime_dedicated *rt_d = &pc->rt.rt_d;
1144 unsigned int j;
1145 u32 pin_mask = pc->rt_pin_mask;
1146
1147 for (j = 0; j < RT_D_CFGS_PER_BANK; j++) {
1148 if (BIT(j) & pin_mask) {
1149 struct reg_field reg = REG_FIELD(reg_offset, 0, 31);
1150 rt_d->rt[j] = devm_regmap_field_alloc(dev, rm, reg);
1151 if (IS_ERR(rt_d->rt[j]))
1152 return -EINVAL;
1153 reg_offset += 4;
1154 }
1155 }
1156 return 0;
1157 }
1158
1159 static int st_pctl_dt_setup_retime(struct st_pinctrl *info,
1160 int bank, struct st_pio_control *pc)
1161 {
1162 const struct st_pctl_data *data = info->data;
1163 if (data->rt_style == st_retime_style_packed)
1164 return st_pctl_dt_setup_retime_packed(info, bank, pc);
1165 else if (data->rt_style == st_retime_style_dedicated)
1166 return st_pctl_dt_setup_retime_dedicated(info, bank, pc);
1167
1168 return -EINVAL;
1169 }
1170
1171
1172 static struct regmap_field *st_pc_get_value(struct device *dev,
1173 struct regmap *regmap, int bank,
1174 int data, int lsb, int msb)
1175 {
1176 struct reg_field reg = REG_FIELD((data + bank) * 4, lsb, msb);
1177
1178 if (data < 0)
1179 return NULL;
1180
1181 return devm_regmap_field_alloc(dev, regmap, reg);
1182 }
1183
1184 static void st_parse_syscfgs(struct st_pinctrl *info, int bank,
1185 struct device_node *np)
1186 {
1187 const struct st_pctl_data *data = info->data;
1188 /**
1189 * For a given shared register like OE/PU/OD, there are 8 bits per bank
1190 * 0:7 belongs to bank0, 8:15 belongs to bank1 ...
1191 * So each register is shared across 4 banks.
1192 */
1193 int lsb = (bank%4) * ST_GPIO_PINS_PER_BANK;
1194 int msb = lsb + ST_GPIO_PINS_PER_BANK - 1;
1195 struct st_pio_control *pc = &info->banks[bank].pc;
1196 struct device *dev = info->dev;
1197 struct regmap *regmap = info->regmap;
1198
1199 pc->alt = st_pc_get_value(dev, regmap, bank, data->alt, 0, 31);
1200 pc->oe = st_pc_get_value(dev, regmap, bank/4, data->oe, lsb, msb);
1201 pc->pu = st_pc_get_value(dev, regmap, bank/4, data->pu, lsb, msb);
1202 pc->od = st_pc_get_value(dev, regmap, bank/4, data->od, lsb, msb);
1203
1204 /* retime avaiable for all pins by default */
1205 pc->rt_pin_mask = 0xff;
1206 of_property_read_u32(np, "st,retime-pin-mask", &pc->rt_pin_mask);
1207 st_pctl_dt_setup_retime(info, bank, pc);
1208
1209 return;
1210 }
1211
1212 /*
1213 * Each pin is represented in of the below forms.
1214 * <bank offset mux direction rt_type rt_delay rt_clk>
1215 */
1216 static int st_pctl_dt_parse_groups(struct device_node *np,
1217 struct st_pctl_group *grp, struct st_pinctrl *info, int idx)
1218 {
1219 /* bank pad direction val altfunction */
1220 const __be32 *list;
1221 struct property *pp;
1222 struct st_pinconf *conf;
1223 struct device_node *pins;
1224 int i = 0, npins = 0, nr_props;
1225
1226 pins = of_get_child_by_name(np, "st,pins");
1227 if (!pins)
1228 return -ENODATA;
1229
1230 for_each_property_of_node(pins, pp) {
1231 /* Skip those we do not want to proceed */
1232 if (!strcmp(pp->name, "name"))
1233 continue;
1234
1235 if (pp && (pp->length/sizeof(__be32)) >= OF_GPIO_ARGS_MIN) {
1236 npins++;
1237 } else {
1238 pr_warn("Invalid st,pins in %s node\n", np->name);
1239 return -EINVAL;
1240 }
1241 }
1242
1243 grp->npins = npins;
1244 grp->name = np->name;
1245 grp->pins = devm_kzalloc(info->dev, npins * sizeof(u32), GFP_KERNEL);
1246 grp->pin_conf = devm_kzalloc(info->dev,
1247 npins * sizeof(*conf), GFP_KERNEL);
1248
1249 if (!grp->pins || !grp->pin_conf)
1250 return -ENOMEM;
1251
1252 /* <bank offset mux direction rt_type rt_delay rt_clk> */
1253 for_each_property_of_node(pins, pp) {
1254 if (!strcmp(pp->name, "name"))
1255 continue;
1256 nr_props = pp->length/sizeof(u32);
1257 list = pp->value;
1258 conf = &grp->pin_conf[i];
1259
1260 /* bank & offset */
1261 be32_to_cpup(list++);
1262 be32_to_cpup(list++);
1263 conf->pin = of_get_named_gpio(pins, pp->name, 0);
1264 conf->name = pp->name;
1265 grp->pins[i] = conf->pin;
1266 /* mux */
1267 conf->altfunc = be32_to_cpup(list++);
1268 conf->config = 0;
1269 /* direction */
1270 conf->config |= be32_to_cpup(list++);
1271 /* rt_type rt_delay rt_clk */
1272 if (nr_props >= OF_GPIO_ARGS_MIN + OF_RT_ARGS_MIN) {
1273 /* rt_type */
1274 conf->config |= be32_to_cpup(list++);
1275 /* rt_delay */
1276 conf->config |= be32_to_cpup(list++);
1277 /* rt_clk */
1278 if (nr_props > OF_GPIO_ARGS_MIN + OF_RT_ARGS_MIN)
1279 conf->config |= be32_to_cpup(list++);
1280 }
1281 i++;
1282 }
1283 of_node_put(pins);
1284
1285 return 0;
1286 }
1287
1288 static int st_pctl_parse_functions(struct device_node *np,
1289 struct st_pinctrl *info, u32 index, int *grp_index)
1290 {
1291 struct device_node *child;
1292 struct st_pmx_func *func;
1293 struct st_pctl_group *grp;
1294 int ret, i;
1295
1296 func = &info->functions[index];
1297 func->name = np->name;
1298 func->ngroups = of_get_child_count(np);
1299 if (func->ngroups == 0) {
1300 dev_err(info->dev, "No groups defined\n");
1301 return -EINVAL;
1302 }
1303 func->groups = devm_kzalloc(info->dev,
1304 func->ngroups * sizeof(char *), GFP_KERNEL);
1305 if (!func->groups)
1306 return -ENOMEM;
1307
1308 i = 0;
1309 for_each_child_of_node(np, child) {
1310 func->groups[i] = child->name;
1311 grp = &info->groups[*grp_index];
1312 *grp_index += 1;
1313 ret = st_pctl_dt_parse_groups(child, grp, info, i++);
1314 if (ret)
1315 return ret;
1316 }
1317 dev_info(info->dev, "Function[%d\t name:%s,\tgroups:%d]\n",
1318 index, func->name, func->ngroups);
1319
1320 return 0;
1321 }
1322
1323 static void st_gpio_irq_mask(struct irq_data *d)
1324 {
1325 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
1326 struct st_gpio_bank *bank = gpiochip_get_data(gc);
1327
1328 writel(BIT(d->hwirq), bank->base + REG_PIO_CLR_PMASK);
1329 }
1330
1331 static void st_gpio_irq_unmask(struct irq_data *d)
1332 {
1333 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
1334 struct st_gpio_bank *bank = gpiochip_get_data(gc);
1335
1336 writel(BIT(d->hwirq), bank->base + REG_PIO_SET_PMASK);
1337 }
1338
1339 static int st_gpio_irq_set_type(struct irq_data *d, unsigned type)
1340 {
1341 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
1342 struct st_gpio_bank *bank = gpiochip_get_data(gc);
1343 unsigned long flags;
1344 int comp, pin = d->hwirq;
1345 u32 val;
1346 u32 pin_edge_conf = 0;
1347
1348 switch (type) {
1349 case IRQ_TYPE_LEVEL_HIGH:
1350 comp = 0;
1351 break;
1352 case IRQ_TYPE_EDGE_FALLING:
1353 comp = 0;
1354 pin_edge_conf = ST_IRQ_FALLING_EDGE_CONF(pin);
1355 break;
1356 case IRQ_TYPE_LEVEL_LOW:
1357 comp = 1;
1358 break;
1359 case IRQ_TYPE_EDGE_RISING:
1360 comp = 1;
1361 pin_edge_conf = ST_IRQ_RISING_EDGE_CONF(pin);
1362 break;
1363 case IRQ_TYPE_EDGE_BOTH:
1364 comp = st_gpio_get(&bank->gpio_chip, pin);
1365 pin_edge_conf = ST_IRQ_BOTH_EDGE_CONF(pin);
1366 break;
1367 default:
1368 return -EINVAL;
1369 }
1370
1371 spin_lock_irqsave(&bank->lock, flags);
1372 bank->irq_edge_conf &= ~(ST_IRQ_EDGE_MASK << (
1373 pin * ST_IRQ_EDGE_CONF_BITS_PER_PIN));
1374 bank->irq_edge_conf |= pin_edge_conf;
1375 spin_unlock_irqrestore(&bank->lock, flags);
1376
1377 val = readl(bank->base + REG_PIO_PCOMP);
1378 val &= ~BIT(pin);
1379 val |= (comp << pin);
1380 writel(val, bank->base + REG_PIO_PCOMP);
1381
1382 return 0;
1383 }
1384
1385 /*
1386 * As edge triggers are not supported at hardware level, it is supported by
1387 * software by exploiting the level trigger support in hardware.
1388 *
1389 * Steps for detection raising edge interrupt in software.
1390 *
1391 * Step 1: CONFIGURE pin to detect level LOW interrupts.
1392 *
1393 * Step 2: DETECT level LOW interrupt and in irqmux/gpio bank interrupt handler,
1394 * if the value of pin is low, then CONFIGURE pin for level HIGH interrupt.
1395 * IGNORE calling the actual interrupt handler for the pin at this stage.
1396 *
1397 * Step 3: DETECT level HIGH interrupt and in irqmux/gpio-bank interrupt handler
1398 * if the value of pin is HIGH, CONFIGURE pin for level LOW interrupt and then
1399 * DISPATCH the interrupt to the interrupt handler of the pin.
1400 *
1401 * step-1 ________ __________
1402 * | | step - 3
1403 * | |
1404 * step -2 |_____|
1405 *
1406 * falling edge is also detected int the same way.
1407 *
1408 */
1409 static void __gpio_irq_handler(struct st_gpio_bank *bank)
1410 {
1411 unsigned long port_in, port_mask, port_comp, active_irqs;
1412 unsigned long bank_edge_mask, flags;
1413 int n, val, ecfg;
1414
1415 spin_lock_irqsave(&bank->lock, flags);
1416 bank_edge_mask = bank->irq_edge_conf;
1417 spin_unlock_irqrestore(&bank->lock, flags);
1418
1419 for (;;) {
1420 port_in = readl(bank->base + REG_PIO_PIN);
1421 port_comp = readl(bank->base + REG_PIO_PCOMP);
1422 port_mask = readl(bank->base + REG_PIO_PMASK);
1423
1424 active_irqs = (port_in ^ port_comp) & port_mask;
1425
1426 if (active_irqs == 0)
1427 break;
1428
1429 for_each_set_bit(n, &active_irqs, BITS_PER_LONG) {
1430 /* check if we are detecting fake edges ... */
1431 ecfg = ST_IRQ_EDGE_CONF(bank_edge_mask, n);
1432
1433 if (ecfg) {
1434 /* edge detection. */
1435 val = st_gpio_get(&bank->gpio_chip, n);
1436
1437 writel(BIT(n),
1438 val ? bank->base + REG_PIO_SET_PCOMP :
1439 bank->base + REG_PIO_CLR_PCOMP);
1440
1441 if (ecfg != ST_IRQ_EDGE_BOTH &&
1442 !((ecfg & ST_IRQ_EDGE_FALLING) ^ val))
1443 continue;
1444 }
1445
1446 generic_handle_irq(irq_find_mapping(bank->gpio_chip.irqdomain, n));
1447 }
1448 }
1449 }
1450
1451 static void st_gpio_irq_handler(struct irq_desc *desc)
1452 {
1453 /* interrupt dedicated per bank */
1454 struct irq_chip *chip = irq_desc_get_chip(desc);
1455 struct gpio_chip *gc = irq_desc_get_handler_data(desc);
1456 struct st_gpio_bank *bank = gpiochip_get_data(gc);
1457
1458 chained_irq_enter(chip, desc);
1459 __gpio_irq_handler(bank);
1460 chained_irq_exit(chip, desc);
1461 }
1462
1463 static void st_gpio_irqmux_handler(struct irq_desc *desc)
1464 {
1465 struct irq_chip *chip = irq_desc_get_chip(desc);
1466 struct st_pinctrl *info = irq_desc_get_handler_data(desc);
1467 unsigned long status;
1468 int n;
1469
1470 chained_irq_enter(chip, desc);
1471
1472 status = readl(info->irqmux_base);
1473
1474 for_each_set_bit(n, &status, info->nbanks)
1475 __gpio_irq_handler(&info->banks[n]);
1476
1477 chained_irq_exit(chip, desc);
1478 }
1479
1480 static struct gpio_chip st_gpio_template = {
1481 .request = gpiochip_generic_request,
1482 .free = gpiochip_generic_free,
1483 .get = st_gpio_get,
1484 .set = st_gpio_set,
1485 .direction_input = st_gpio_direction_input,
1486 .direction_output = st_gpio_direction_output,
1487 .get_direction = st_gpio_get_direction,
1488 .ngpio = ST_GPIO_PINS_PER_BANK,
1489 .of_gpio_n_cells = 1,
1490 .of_xlate = st_gpio_xlate,
1491 };
1492
1493 static struct irq_chip st_gpio_irqchip = {
1494 .name = "GPIO",
1495 .irq_disable = st_gpio_irq_mask,
1496 .irq_mask = st_gpio_irq_mask,
1497 .irq_unmask = st_gpio_irq_unmask,
1498 .irq_set_type = st_gpio_irq_set_type,
1499 .flags = IRQCHIP_SKIP_SET_WAKE,
1500 };
1501
1502 static int st_gpiolib_register_bank(struct st_pinctrl *info,
1503 int bank_nr, struct device_node *np)
1504 {
1505 struct st_gpio_bank *bank = &info->banks[bank_nr];
1506 struct pinctrl_gpio_range *range = &bank->range;
1507 struct device *dev = info->dev;
1508 int bank_num = of_alias_get_id(np, "gpio");
1509 struct resource res, irq_res;
1510 int gpio_irq = 0, err;
1511
1512 if (of_address_to_resource(np, 0, &res))
1513 return -ENODEV;
1514
1515 bank->base = devm_ioremap_resource(dev, &res);
1516 if (IS_ERR(bank->base))
1517 return PTR_ERR(bank->base);
1518
1519 bank->gpio_chip = st_gpio_template;
1520 bank->gpio_chip.base = bank_num * ST_GPIO_PINS_PER_BANK;
1521 bank->gpio_chip.ngpio = ST_GPIO_PINS_PER_BANK;
1522 bank->gpio_chip.of_node = np;
1523 bank->gpio_chip.parent = dev;
1524 spin_lock_init(&bank->lock);
1525
1526 of_property_read_string(np, "st,bank-name", &range->name);
1527 bank->gpio_chip.label = range->name;
1528
1529 range->id = bank_num;
1530 range->pin_base = range->base = range->id * ST_GPIO_PINS_PER_BANK;
1531 range->npins = bank->gpio_chip.ngpio;
1532 range->gc = &bank->gpio_chip;
1533 err = gpiochip_add_data(&bank->gpio_chip, bank);
1534 if (err) {
1535 dev_err(dev, "Failed to add gpiochip(%d)!\n", bank_num);
1536 return err;
1537 }
1538 dev_info(dev, "%s bank added.\n", range->name);
1539
1540 /**
1541 * GPIO bank can have one of the two possible types of
1542 * interrupt-wirings.
1543 *
1544 * First type is via irqmux, single interrupt is used by multiple
1545 * gpio banks. This reduces number of overall interrupts numbers
1546 * required. All these banks belong to a single pincontroller.
1547 * _________
1548 * | |----> [gpio-bank (n) ]
1549 * | |----> [gpio-bank (n + 1)]
1550 * [irqN]-- | irq-mux |----> [gpio-bank (n + 2)]
1551 * | |----> [gpio-bank (... )]
1552 * |_________|----> [gpio-bank (n + 7)]
1553 *
1554 * Second type has a dedicated interrupt per each gpio bank.
1555 *
1556 * [irqN]----> [gpio-bank (n)]
1557 */
1558
1559 if (of_irq_to_resource(np, 0, &irq_res)) {
1560 gpio_irq = irq_res.start;
1561 gpiochip_set_chained_irqchip(&bank->gpio_chip, &st_gpio_irqchip,
1562 gpio_irq, st_gpio_irq_handler);
1563 }
1564
1565 if (info->irqmux_base || gpio_irq > 0) {
1566 err = gpiochip_irqchip_add(&bank->gpio_chip, &st_gpio_irqchip,
1567 0, handle_simple_irq,
1568 IRQ_TYPE_LEVEL_LOW);
1569 if (err) {
1570 gpiochip_remove(&bank->gpio_chip);
1571 dev_info(dev, "could not add irqchip\n");
1572 return err;
1573 }
1574 } else {
1575 dev_info(dev, "No IRQ support for %s bank\n", np->full_name);
1576 }
1577
1578 return 0;
1579 }
1580
1581 static const struct of_device_id st_pctl_of_match[] = {
1582 { .compatible = "st,stih415-sbc-pinctrl", .data = &stih415_sbc_data },
1583 { .compatible = "st,stih415-rear-pinctrl", .data = &stih415_rear_data },
1584 { .compatible = "st,stih415-left-pinctrl", .data = &stih415_left_data },
1585 { .compatible = "st,stih415-right-pinctrl",
1586 .data = &stih415_right_data },
1587 { .compatible = "st,stih415-front-pinctrl",
1588 .data = &stih415_front_data },
1589 { .compatible = "st,stih416-sbc-pinctrl", .data = &stih416_data},
1590 { .compatible = "st,stih416-front-pinctrl", .data = &stih416_data},
1591 { .compatible = "st,stih416-rear-pinctrl", .data = &stih416_data},
1592 { .compatible = "st,stih416-fvdp-fe-pinctrl", .data = &stih416_data},
1593 { .compatible = "st,stih416-fvdp-lite-pinctrl", .data = &stih416_data},
1594 { .compatible = "st,stih407-sbc-pinctrl", .data = &stih416_data},
1595 { .compatible = "st,stih407-front-pinctrl", .data = &stih416_data},
1596 { .compatible = "st,stih407-rear-pinctrl", .data = &stih416_data},
1597 { .compatible = "st,stih407-flash-pinctrl", .data = &stih407_flashdata},
1598 { /* sentinel */ }
1599 };
1600
1601 static int st_pctl_probe_dt(struct platform_device *pdev,
1602 struct pinctrl_desc *pctl_desc, struct st_pinctrl *info)
1603 {
1604 int ret = 0;
1605 int i = 0, j = 0, k = 0, bank;
1606 struct pinctrl_pin_desc *pdesc;
1607 struct device_node *np = pdev->dev.of_node;
1608 struct device_node *child;
1609 int grp_index = 0;
1610 int irq = 0;
1611 struct resource *res;
1612
1613 st_pctl_dt_child_count(info, np);
1614 if (!info->nbanks) {
1615 dev_err(&pdev->dev, "you need atleast one gpio bank\n");
1616 return -EINVAL;
1617 }
1618
1619 dev_info(&pdev->dev, "nbanks = %d\n", info->nbanks);
1620 dev_info(&pdev->dev, "nfunctions = %d\n", info->nfunctions);
1621 dev_info(&pdev->dev, "ngroups = %d\n", info->ngroups);
1622
1623 info->functions = devm_kzalloc(&pdev->dev,
1624 info->nfunctions * sizeof(*info->functions), GFP_KERNEL);
1625
1626 info->groups = devm_kzalloc(&pdev->dev,
1627 info->ngroups * sizeof(*info->groups) , GFP_KERNEL);
1628
1629 info->banks = devm_kzalloc(&pdev->dev,
1630 info->nbanks * sizeof(*info->banks), GFP_KERNEL);
1631
1632 if (!info->functions || !info->groups || !info->banks)
1633 return -ENOMEM;
1634
1635 info->regmap = syscon_regmap_lookup_by_phandle(np, "st,syscfg");
1636 if (IS_ERR(info->regmap)) {
1637 dev_err(info->dev, "No syscfg phandle specified\n");
1638 return PTR_ERR(info->regmap);
1639 }
1640 info->data = of_match_node(st_pctl_of_match, np)->data;
1641
1642 irq = platform_get_irq(pdev, 0);
1643
1644 if (irq > 0) {
1645 res = platform_get_resource_byname(pdev,
1646 IORESOURCE_MEM, "irqmux");
1647 info->irqmux_base = devm_ioremap_resource(&pdev->dev, res);
1648
1649 if (IS_ERR(info->irqmux_base))
1650 return PTR_ERR(info->irqmux_base);
1651
1652 irq_set_chained_handler_and_data(irq, st_gpio_irqmux_handler,
1653 info);
1654
1655 }
1656
1657 pctl_desc->npins = info->nbanks * ST_GPIO_PINS_PER_BANK;
1658 pdesc = devm_kzalloc(&pdev->dev,
1659 sizeof(*pdesc) * pctl_desc->npins, GFP_KERNEL);
1660 if (!pdesc)
1661 return -ENOMEM;
1662
1663 pctl_desc->pins = pdesc;
1664
1665 bank = 0;
1666 for_each_child_of_node(np, child) {
1667 if (of_property_read_bool(child, "gpio-controller")) {
1668 const char *bank_name = NULL;
1669 ret = st_gpiolib_register_bank(info, bank, child);
1670 if (ret)
1671 return ret;
1672
1673 k = info->banks[bank].range.pin_base;
1674 bank_name = info->banks[bank].range.name;
1675 for (j = 0; j < ST_GPIO_PINS_PER_BANK; j++, k++) {
1676 pdesc->number = k;
1677 pdesc->name = kasprintf(GFP_KERNEL, "%s[%d]",
1678 bank_name, j);
1679 pdesc++;
1680 }
1681 st_parse_syscfgs(info, bank, child);
1682 bank++;
1683 } else {
1684 ret = st_pctl_parse_functions(child, info,
1685 i++, &grp_index);
1686 if (ret) {
1687 dev_err(&pdev->dev, "No functions found.\n");
1688 return ret;
1689 }
1690 }
1691 }
1692
1693 return 0;
1694 }
1695
1696 static int st_pctl_probe(struct platform_device *pdev)
1697 {
1698 struct st_pinctrl *info;
1699 struct pinctrl_desc *pctl_desc;
1700 int ret, i;
1701
1702 if (!pdev->dev.of_node) {
1703 dev_err(&pdev->dev, "device node not found.\n");
1704 return -EINVAL;
1705 }
1706
1707 pctl_desc = devm_kzalloc(&pdev->dev, sizeof(*pctl_desc), GFP_KERNEL);
1708 if (!pctl_desc)
1709 return -ENOMEM;
1710
1711 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
1712 if (!info)
1713 return -ENOMEM;
1714
1715 info->dev = &pdev->dev;
1716 platform_set_drvdata(pdev, info);
1717 ret = st_pctl_probe_dt(pdev, pctl_desc, info);
1718 if (ret)
1719 return ret;
1720
1721 pctl_desc->owner = THIS_MODULE;
1722 pctl_desc->pctlops = &st_pctlops;
1723 pctl_desc->pmxops = &st_pmxops;
1724 pctl_desc->confops = &st_confops;
1725 pctl_desc->name = dev_name(&pdev->dev);
1726
1727 info->pctl = pinctrl_register(pctl_desc, &pdev->dev, info);
1728 if (IS_ERR(info->pctl)) {
1729 dev_err(&pdev->dev, "Failed pinctrl registration\n");
1730 return PTR_ERR(info->pctl);
1731 }
1732
1733 for (i = 0; i < info->nbanks; i++)
1734 pinctrl_add_gpio_range(info->pctl, &info->banks[i].range);
1735
1736 return 0;
1737 }
1738
1739 static struct platform_driver st_pctl_driver = {
1740 .driver = {
1741 .name = "st-pinctrl",
1742 .of_match_table = st_pctl_of_match,
1743 },
1744 .probe = st_pctl_probe,
1745 };
1746
1747 static int __init st_pctl_init(void)
1748 {
1749 return platform_driver_register(&st_pctl_driver);
1750 }
1751 arch_initcall(st_pctl_init);
Linux with added FPC-III support