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bna: remove oper_state_cbfn from struct bna_rxf
[linux/fpc-iii.git] / drivers / pinctrl / pinctrl-st.c
blob65bf73b70e3406c72db02f796840fa6296bbdcb9
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 gpio_chip_to_bank(chip) \
207 container_of(chip, struct st_gpio_bank, gpio_chip)
208
209 #define pc_to_bank(pc) \
210 container_of(pc, struct st_gpio_bank, pc)
211
212 enum st_retime_style {
213 st_retime_style_none,
214 st_retime_style_packed,
215 st_retime_style_dedicated,
216 };
217
218 struct st_retime_dedicated {
219 struct regmap_field *rt[ST_GPIO_PINS_PER_BANK];
220 };
221
222 struct st_retime_packed {
223 struct regmap_field *clk1notclk0;
224 struct regmap_field *delay_0;
225 struct regmap_field *delay_1;
226 struct regmap_field *invertclk;
227 struct regmap_field *retime;
228 struct regmap_field *clknotdata;
229 struct regmap_field *double_edge;
230 };
231
232 struct st_pio_control {
233 u32 rt_pin_mask;
234 struct regmap_field *alt, *oe, *pu, *od;
235 /* retiming */
236 union {
237 struct st_retime_packed rt_p;
238 struct st_retime_dedicated rt_d;
239 } rt;
240 };
241
242 struct st_pctl_data {
243 const enum st_retime_style rt_style;
244 const unsigned int *input_delays;
245 const int ninput_delays;
246 const unsigned int *output_delays;
247 const int noutput_delays;
248 /* register offset information */
249 const int alt, oe, pu, od, rt;
250 };
251
252 struct st_pinconf {
253 int pin;
254 const char *name;
255 unsigned long config;
256 int altfunc;
257 };
258
259 struct st_pmx_func {
260 const char *name;
261 const char **groups;
262 unsigned ngroups;
263 };
264
265 struct st_pctl_group {
266 const char *name;
267 unsigned int *pins;
268 unsigned npins;
269 struct st_pinconf *pin_conf;
270 };
271
272 /*
273 * Edge triggers are not supported at hardware level, it is supported by
274 * software by exploiting the level trigger support in hardware.
275 * Software uses a virtual register (EDGE_CONF) for edge trigger configuration
276 * of each gpio pin in a GPIO bank.
277 *
278 * Each bank has a 32 bit EDGE_CONF register which is divided in to 8 parts of
279 * 4-bits. Each 4-bit space is allocated for each pin in a gpio bank.
280 *
281 * bit allocation per pin is:
282 * Bits: [0 - 3] | [4 - 7] [8 - 11] ... ... ... ... [ 28 - 31]
283 * --------------------------------------------------------
284 * | pin-0 | pin-2 | pin-3 | ... ... ... ... | pin -7 |
285 * --------------------------------------------------------
286 *
287 * A pin can have one of following the values in its edge configuration field.
288 *
289 * ------- ----------------------------
290 * [0-3] - Description
291 * ------- ----------------------------
292 * 0000 - No edge IRQ.
293 * 0001 - Falling edge IRQ.
294 * 0010 - Rising edge IRQ.
295 * 0011 - Rising and Falling edge IRQ.
296 * ------- ----------------------------
297 */
298
299 #define ST_IRQ_EDGE_CONF_BITS_PER_PIN 4
300 #define ST_IRQ_EDGE_MASK 0xf
301 #define ST_IRQ_EDGE_FALLING BIT(0)
302 #define ST_IRQ_EDGE_RISING BIT(1)
303 #define ST_IRQ_EDGE_BOTH (BIT(0) | BIT(1))
304
305 #define ST_IRQ_RISING_EDGE_CONF(pin) \
306 (ST_IRQ_EDGE_RISING << (pin * ST_IRQ_EDGE_CONF_BITS_PER_PIN))
307
308 #define ST_IRQ_FALLING_EDGE_CONF(pin) \
309 (ST_IRQ_EDGE_FALLING << (pin * ST_IRQ_EDGE_CONF_BITS_PER_PIN))
310
311 #define ST_IRQ_BOTH_EDGE_CONF(pin) \
312 (ST_IRQ_EDGE_BOTH << (pin * ST_IRQ_EDGE_CONF_BITS_PER_PIN))
313
314 #define ST_IRQ_EDGE_CONF(conf, pin) \
315 (conf >> (pin * ST_IRQ_EDGE_CONF_BITS_PER_PIN) & ST_IRQ_EDGE_MASK)
316
317 struct st_gpio_bank {
318 struct gpio_chip gpio_chip;
319 struct pinctrl_gpio_range range;
320 void __iomem *base;
321 struct st_pio_control pc;
322 unsigned long irq_edge_conf;
323 spinlock_t lock;
324 };
325
326 struct st_pinctrl {
327 struct device *dev;
328 struct pinctrl_dev *pctl;
329 struct st_gpio_bank *banks;
330 int nbanks;
331 struct st_pmx_func *functions;
332 int nfunctions;
333 struct st_pctl_group *groups;
334 int ngroups;
335 struct regmap *regmap;
336 const struct st_pctl_data *data;
337 void __iomem *irqmux_base;
338 };
339
340 /* SOC specific data */
341 /* STiH415 data */
342 static const unsigned int stih415_input_delays[] = {0, 500, 1000, 1500};
343 static const unsigned int stih415_output_delays[] = {0, 1000, 2000, 3000};
344
345 #define STIH415_PCTRL_COMMON_DATA \
346 .rt_style = st_retime_style_packed, \
347 .input_delays = stih415_input_delays, \
348 .ninput_delays = ARRAY_SIZE(stih415_input_delays), \
349 .output_delays = stih415_output_delays, \
350 .noutput_delays = ARRAY_SIZE(stih415_output_delays)
351
352 static const struct st_pctl_data stih415_sbc_data = {
353 STIH415_PCTRL_COMMON_DATA,
354 .alt = 0, .oe = 5, .pu = 7, .od = 9, .rt = 16,
355 };
356
357 static const struct st_pctl_data stih415_front_data = {
358 STIH415_PCTRL_COMMON_DATA,
359 .alt = 0, .oe = 8, .pu = 10, .od = 12, .rt = 16,
360 };
361
362 static const struct st_pctl_data stih415_rear_data = {
363 STIH415_PCTRL_COMMON_DATA,
364 .alt = 0, .oe = 6, .pu = 8, .od = 10, .rt = 38,
365 };
366
367 static const struct st_pctl_data stih415_left_data = {
368 STIH415_PCTRL_COMMON_DATA,
369 .alt = 0, .oe = 3, .pu = 4, .od = 5, .rt = 6,
370 };
371
372 static const struct st_pctl_data stih415_right_data = {
373 STIH415_PCTRL_COMMON_DATA,
374 .alt = 0, .oe = 5, .pu = 7, .od = 9, .rt = 11,
375 };
376
377 /* STiH416 data */
378 static const unsigned int stih416_delays[] = {0, 300, 500, 750, 1000, 1250,
379 1500, 1750, 2000, 2250, 2500, 2750, 3000, 3250 };
380
381 static const struct st_pctl_data stih416_data = {
382 .rt_style = st_retime_style_dedicated,
383 .input_delays = stih416_delays,
384 .ninput_delays = ARRAY_SIZE(stih416_delays),
385 .output_delays = stih416_delays,
386 .noutput_delays = ARRAY_SIZE(stih416_delays),
387 .alt = 0, .oe = 40, .pu = 50, .od = 60, .rt = 100,
388 };
389
390 static const struct st_pctl_data stih407_flashdata = {
391 .rt_style = st_retime_style_none,
392 .input_delays = stih416_delays,
393 .ninput_delays = ARRAY_SIZE(stih416_delays),
394 .output_delays = stih416_delays,
395 .noutput_delays = ARRAY_SIZE(stih416_delays),
396 .alt = 0,
397 .oe = -1, /* Not Available */
398 .pu = -1, /* Not Available */
399 .od = 60,
400 .rt = 100,
401 };
402
403 static struct st_pio_control *st_get_pio_control(
404 struct pinctrl_dev *pctldev, int pin)
405 {
406 struct pinctrl_gpio_range *range =
407 pinctrl_find_gpio_range_from_pin(pctldev, pin);
408 struct st_gpio_bank *bank = gpio_range_to_bank(range);
409
410 return &bank->pc;
411 }
412
413 /* Low level functions.. */
414 static inline int st_gpio_bank(int gpio)
415 {
416 return gpio/ST_GPIO_PINS_PER_BANK;
417 }
418
419 static inline int st_gpio_pin(int gpio)
420 {
421 return gpio%ST_GPIO_PINS_PER_BANK;
422 }
423
424 static void st_pinconf_set_config(struct st_pio_control *pc,
425 int pin, unsigned long config)
426 {
427 struct regmap_field *output_enable = pc->oe;
428 struct regmap_field *pull_up = pc->pu;
429 struct regmap_field *open_drain = pc->od;
430 unsigned int oe_value, pu_value, od_value;
431 unsigned long mask = BIT(pin);
432
433 if (output_enable) {
434 regmap_field_read(output_enable, &oe_value);
435 oe_value &= ~mask;
436 if (config & ST_PINCONF_OE)
437 oe_value |= mask;
438 regmap_field_write(output_enable, oe_value);
439 }
440
441 if (pull_up) {
442 regmap_field_read(pull_up, &pu_value);
443 pu_value &= ~mask;
444 if (config & ST_PINCONF_PU)
445 pu_value |= mask;
446 regmap_field_write(pull_up, pu_value);
447 }
448
449 if (open_drain) {
450 regmap_field_read(open_drain, &od_value);
451 od_value &= ~mask;
452 if (config & ST_PINCONF_OD)
453 od_value |= mask;
454 regmap_field_write(open_drain, od_value);
455 }
456 }
457
458 static void st_pctl_set_function(struct st_pio_control *pc,
459 int pin_id, int function)
460 {
461 struct regmap_field *alt = pc->alt;
462 unsigned int val;
463 int pin = st_gpio_pin(pin_id);
464 int offset = pin * 4;
465
466 if (!alt)
467 return;
468
469 regmap_field_read(alt, &val);
470 val &= ~(0xf << offset);
471 val |= function << offset;
472 regmap_field_write(alt, val);
473 }
474
475 static unsigned int st_pctl_get_pin_function(struct st_pio_control *pc, int pin)
476 {
477 struct regmap_field *alt = pc->alt;
478 unsigned int val;
479 int offset = pin * 4;
480
481 if (!alt)
482 return 0;
483
484 regmap_field_read(alt, &val);
485
486 return (val >> offset) & 0xf;
487 }
488
489 static unsigned long st_pinconf_delay_to_bit(unsigned int delay,
490 const struct st_pctl_data *data, unsigned long config)
491 {
492 const unsigned int *delay_times;
493 int num_delay_times, i, closest_index = -1;
494 unsigned int closest_divergence = UINT_MAX;
495
496 if (ST_PINCONF_UNPACK_OE(config)) {
497 delay_times = data->output_delays;
498 num_delay_times = data->noutput_delays;
499 } else {
500 delay_times = data->input_delays;
501 num_delay_times = data->ninput_delays;
502 }
503
504 for (i = 0; i < num_delay_times; i++) {
505 unsigned int divergence = abs(delay - delay_times[i]);
506
507 if (divergence == 0)
508 return i;
509
510 if (divergence < closest_divergence) {
511 closest_divergence = divergence;
512 closest_index = i;
513 }
514 }
515
516 pr_warn("Attempt to set delay %d, closest available %d\n",
517 delay, delay_times[closest_index]);
518
519 return closest_index;
520 }
521
522 static unsigned long st_pinconf_bit_to_delay(unsigned int index,
523 const struct st_pctl_data *data, unsigned long output)
524 {
525 const unsigned int *delay_times;
526 int num_delay_times;
527
528 if (output) {
529 delay_times = data->output_delays;
530 num_delay_times = data->noutput_delays;
531 } else {
532 delay_times = data->input_delays;
533 num_delay_times = data->ninput_delays;
534 }
535
536 if (index < num_delay_times) {
537 return delay_times[index];
538 } else {
539 pr_warn("Delay not found in/out delay list\n");
540 return 0;
541 }
542 }
543
544 static void st_regmap_field_bit_set_clear_pin(struct regmap_field *field,
545 int enable, int pin)
546 {
547 unsigned int val = 0;
548
549 regmap_field_read(field, &val);
550 if (enable)
551 val |= BIT(pin);
552 else
553 val &= ~BIT(pin);
554 regmap_field_write(field, val);
555 }
556
557 static void st_pinconf_set_retime_packed(struct st_pinctrl *info,
558 struct st_pio_control *pc, unsigned long config, int pin)
559 {
560 const struct st_pctl_data *data = info->data;
561 struct st_retime_packed *rt_p = &pc->rt.rt_p;
562 unsigned int delay;
563
564 st_regmap_field_bit_set_clear_pin(rt_p->clk1notclk0,
565 ST_PINCONF_UNPACK_RT_CLK(config), pin);
566
567 st_regmap_field_bit_set_clear_pin(rt_p->clknotdata,
568 ST_PINCONF_UNPACK_RT_CLKNOTDATA(config), pin);
569
570 st_regmap_field_bit_set_clear_pin(rt_p->double_edge,
571 ST_PINCONF_UNPACK_RT_DOUBLE_EDGE(config), pin);
572
573 st_regmap_field_bit_set_clear_pin(rt_p->invertclk,
574 ST_PINCONF_UNPACK_RT_INVERTCLK(config), pin);
575
576 st_regmap_field_bit_set_clear_pin(rt_p->retime,
577 ST_PINCONF_UNPACK_RT(config), pin);
578
579 delay = st_pinconf_delay_to_bit(ST_PINCONF_UNPACK_RT_DELAY(config),
580 data, config);
581 /* 2 bit delay, lsb */
582 st_regmap_field_bit_set_clear_pin(rt_p->delay_0, delay & 0x1, pin);
583 /* 2 bit delay, msb */
584 st_regmap_field_bit_set_clear_pin(rt_p->delay_1, delay & 0x2, pin);
585
586 }
587
588 static void st_pinconf_set_retime_dedicated(struct st_pinctrl *info,
589 struct st_pio_control *pc, unsigned long config, int pin)
590 {
591 int input = ST_PINCONF_UNPACK_OE(config) ? 0 : 1;
592 int clk = ST_PINCONF_UNPACK_RT_CLK(config);
593 int clknotdata = ST_PINCONF_UNPACK_RT_CLKNOTDATA(config);
594 int double_edge = ST_PINCONF_UNPACK_RT_DOUBLE_EDGE(config);
595 int invertclk = ST_PINCONF_UNPACK_RT_INVERTCLK(config);
596 int retime = ST_PINCONF_UNPACK_RT(config);
597
598 unsigned long delay = st_pinconf_delay_to_bit(
599 ST_PINCONF_UNPACK_RT_DELAY(config),
600 info->data, config);
601 struct st_retime_dedicated *rt_d = &pc->rt.rt_d;
602
603 unsigned long retime_config =
604 ((clk) << RT_D_CFG_CLK_SHIFT) |
605 ((delay) << RT_D_CFG_DELAY_SHIFT) |
606 ((input) << RT_D_CFG_DELAY_INNOTOUT_SHIFT) |
607 ((retime) << RT_D_CFG_RETIME_SHIFT) |
608 ((clknotdata) << RT_D_CFG_CLKNOTDATA_SHIFT) |
609 ((invertclk) << RT_D_CFG_INVERTCLK_SHIFT) |
610 ((double_edge) << RT_D_CFG_DOUBLE_EDGE_SHIFT);
611
612 regmap_field_write(rt_d->rt[pin], retime_config);
613 }
614
615 static void st_pinconf_get_direction(struct st_pio_control *pc,
616 int pin, unsigned long *config)
617 {
618 unsigned int oe_value, pu_value, od_value;
619
620 if (pc->oe) {
621 regmap_field_read(pc->oe, &oe_value);
622 if (oe_value & BIT(pin))
623 ST_PINCONF_PACK_OE(*config);
624 }
625
626 if (pc->pu) {
627 regmap_field_read(pc->pu, &pu_value);
628 if (pu_value & BIT(pin))
629 ST_PINCONF_PACK_PU(*config);
630 }
631
632 if (pc->od) {
633 regmap_field_read(pc->od, &od_value);
634 if (od_value & BIT(pin))
635 ST_PINCONF_PACK_OD(*config);
636 }
637 }
638
639 static int st_pinconf_get_retime_packed(struct st_pinctrl *info,
640 struct st_pio_control *pc, int pin, unsigned long *config)
641 {
642 const struct st_pctl_data *data = info->data;
643 struct st_retime_packed *rt_p = &pc->rt.rt_p;
644 unsigned int delay_bits, delay, delay0, delay1, val;
645 int output = ST_PINCONF_UNPACK_OE(*config);
646
647 if (!regmap_field_read(rt_p->retime, &val) && (val & BIT(pin)))
648 ST_PINCONF_PACK_RT(*config);
649
650 if (!regmap_field_read(rt_p->clk1notclk0, &val) && (val & BIT(pin)))
651 ST_PINCONF_PACK_RT_CLK(*config, 1);
652
653 if (!regmap_field_read(rt_p->clknotdata, &val) && (val & BIT(pin)))
654 ST_PINCONF_PACK_RT_CLKNOTDATA(*config);
655
656 if (!regmap_field_read(rt_p->double_edge, &val) && (val & BIT(pin)))
657 ST_PINCONF_PACK_RT_DOUBLE_EDGE(*config);
658
659 if (!regmap_field_read(rt_p->invertclk, &val) && (val & BIT(pin)))
660 ST_PINCONF_PACK_RT_INVERTCLK(*config);
661
662 regmap_field_read(rt_p->delay_0, &delay0);
663 regmap_field_read(rt_p->delay_1, &delay1);
664 delay_bits = (((delay1 & BIT(pin)) ? 1 : 0) << 1) |
665 (((delay0 & BIT(pin)) ? 1 : 0));
666 delay = st_pinconf_bit_to_delay(delay_bits, data, output);
667 ST_PINCONF_PACK_RT_DELAY(*config, delay);
668
669 return 0;
670 }
671
672 static int st_pinconf_get_retime_dedicated(struct st_pinctrl *info,
673 struct st_pio_control *pc, int pin, unsigned long *config)
674 {
675 unsigned int value;
676 unsigned long delay_bits, delay, rt_clk;
677 int output = ST_PINCONF_UNPACK_OE(*config);
678 struct st_retime_dedicated *rt_d = &pc->rt.rt_d;
679
680 regmap_field_read(rt_d->rt[pin], &value);
681
682 rt_clk = (value & RT_D_CFG_CLK_MASK) >> RT_D_CFG_CLK_SHIFT;
683 ST_PINCONF_PACK_RT_CLK(*config, rt_clk);
684
685 delay_bits = (value & RT_D_CFG_DELAY_MASK) >> RT_D_CFG_DELAY_SHIFT;
686 delay = st_pinconf_bit_to_delay(delay_bits, info->data, output);
687 ST_PINCONF_PACK_RT_DELAY(*config, delay);
688
689 if (value & RT_D_CFG_CLKNOTDATA_MASK)
690 ST_PINCONF_PACK_RT_CLKNOTDATA(*config);
691
692 if (value & RT_D_CFG_DOUBLE_EDGE_MASK)
693 ST_PINCONF_PACK_RT_DOUBLE_EDGE(*config);
694
695 if (value & RT_D_CFG_INVERTCLK_MASK)
696 ST_PINCONF_PACK_RT_INVERTCLK(*config);
697
698 if (value & RT_D_CFG_RETIME_MASK)
699 ST_PINCONF_PACK_RT(*config);
700
701 return 0;
702 }
703
704 /* GPIO related functions */
705
706 static inline void __st_gpio_set(struct st_gpio_bank *bank,
707 unsigned offset, int value)
708 {
709 if (value)
710 writel(BIT(offset), bank->base + REG_PIO_SET_POUT);
711 else
712 writel(BIT(offset), bank->base + REG_PIO_CLR_POUT);
713 }
714
715 static void st_gpio_direction(struct st_gpio_bank *bank,
716 unsigned int gpio, unsigned int direction)
717 {
718 int offset = st_gpio_pin(gpio);
719 int i = 0;
720 /**
721 * There are three configuration registers (PIOn_PC0, PIOn_PC1
722 * and PIOn_PC2) for each port. These are used to configure the
723 * PIO port pins. Each pin can be configured as an input, output,
724 * bidirectional, or alternative function pin. Three bits, one bit
725 * from each of the three registers, configure the corresponding bit of
726 * the port. Valid bit settings is:
727 *
728 * PC2 PC1 PC0 Direction.
729 * 0 0 0 [Input Weak pull-up]
730 * 0 0 or 1 1 [Bidirection]
731 * 0 1 0 [Output]
732 * 1 0 0 [Input]
733 *
734 * PIOn_SET_PC and PIOn_CLR_PC registers are used to set and clear bits
735 * individually.
736 */
737 for (i = 0; i <= 2; i++) {
738 if (direction & BIT(i))
739 writel(BIT(offset), bank->base + REG_PIO_SET_PC(i));
740 else
741 writel(BIT(offset), bank->base + REG_PIO_CLR_PC(i));
742 }
743 }
744
745 static int st_gpio_request(struct gpio_chip *chip, unsigned offset)
746 {
747 return pinctrl_request_gpio(chip->base + offset);
748 }
749
750 static void st_gpio_free(struct gpio_chip *chip, unsigned offset)
751 {
752 pinctrl_free_gpio(chip->base + offset);
753 }
754
755 static int st_gpio_get(struct gpio_chip *chip, unsigned offset)
756 {
757 struct st_gpio_bank *bank = gpio_chip_to_bank(chip);
758
759 return !!(readl(bank->base + REG_PIO_PIN) & BIT(offset));
760 }
761
762 static void st_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
763 {
764 struct st_gpio_bank *bank = gpio_chip_to_bank(chip);
765 __st_gpio_set(bank, offset, value);
766 }
767
768 static int st_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
769 {
770 pinctrl_gpio_direction_input(chip->base + offset);
771
772 return 0;
773 }
774
775 static int st_gpio_direction_output(struct gpio_chip *chip,
776 unsigned offset, int value)
777 {
778 struct st_gpio_bank *bank = gpio_chip_to_bank(chip);
779
780 __st_gpio_set(bank, offset, value);
781 pinctrl_gpio_direction_output(chip->base + offset);
782
783 return 0;
784 }
785
786 static int st_gpio_get_direction(struct gpio_chip *chip, unsigned offset)
787 {
788 struct st_gpio_bank *bank = gpio_chip_to_bank(chip);
789 struct st_pio_control pc = bank->pc;
790 unsigned long config;
791 unsigned int direction = 0;
792 unsigned int function;
793 unsigned int value;
794 int i = 0;
795
796 /* Alternate function direction is handled by Pinctrl */
797 function = st_pctl_get_pin_function(&pc, offset);
798 if (function) {
799 st_pinconf_get_direction(&pc, offset, &config);
800 return !ST_PINCONF_UNPACK_OE(config);
801 }
802
803 /*
804 * GPIO direction is handled differently
805 * - See st_gpio_direction() above for an explanation
806 */
807 for (i = 0; i <= 2; i++) {
808 value = readl(bank->base + REG_PIO_PC(i));
809 direction |= ((value >> offset) & 0x1) << i;
810 }
811
812 return (direction == ST_GPIO_DIRECTION_IN);
813 }
814
815 static int st_gpio_xlate(struct gpio_chip *gc,
816 const struct of_phandle_args *gpiospec, u32 *flags)
817 {
818 if (WARN_ON(gc->of_gpio_n_cells < 1))
819 return -EINVAL;
820
821 if (WARN_ON(gpiospec->args_count < gc->of_gpio_n_cells))
822 return -EINVAL;
823
824 if (gpiospec->args[0] > gc->ngpio)
825 return -EINVAL;
826
827 return gpiospec->args[0];
828 }
829
830 /* Pinctrl Groups */
831 static int st_pctl_get_groups_count(struct pinctrl_dev *pctldev)
832 {
833 struct st_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
834
835 return info->ngroups;
836 }
837
838 static const char *st_pctl_get_group_name(struct pinctrl_dev *pctldev,
839 unsigned selector)
840 {
841 struct st_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
842
843 return info->groups[selector].name;
844 }
845
846 static int st_pctl_get_group_pins(struct pinctrl_dev *pctldev,
847 unsigned selector, const unsigned **pins, unsigned *npins)
848 {
849 struct st_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
850
851 if (selector >= info->ngroups)
852 return -EINVAL;
853
854 *pins = info->groups[selector].pins;
855 *npins = info->groups[selector].npins;
856
857 return 0;
858 }
859
860 static const inline struct st_pctl_group *st_pctl_find_group_by_name(
861 const struct st_pinctrl *info, const char *name)
862 {
863 int i;
864
865 for (i = 0; i < info->ngroups; i++) {
866 if (!strcmp(info->groups[i].name, name))
867 return &info->groups[i];
868 }
869
870 return NULL;
871 }
872
873 static int st_pctl_dt_node_to_map(struct pinctrl_dev *pctldev,
874 struct device_node *np, struct pinctrl_map **map, unsigned *num_maps)
875 {
876 struct st_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
877 const struct st_pctl_group *grp;
878 struct pinctrl_map *new_map;
879 struct device_node *parent;
880 int map_num, i;
881
882 grp = st_pctl_find_group_by_name(info, np->name);
883 if (!grp) {
884 dev_err(info->dev, "unable to find group for node %s\n",
885 np->name);
886 return -EINVAL;
887 }
888
889 map_num = grp->npins + 1;
890 new_map = devm_kzalloc(pctldev->dev,
891 sizeof(*new_map) * map_num, GFP_KERNEL);
892 if (!new_map)
893 return -ENOMEM;
894
895 parent = of_get_parent(np);
896 if (!parent) {
897 devm_kfree(pctldev->dev, new_map);
898 return -EINVAL;
899 }
900
901 *map = new_map;
902 *num_maps = map_num;
903 new_map[0].type = PIN_MAP_TYPE_MUX_GROUP;
904 new_map[0].data.mux.function = parent->name;
905 new_map[0].data.mux.group = np->name;
906 of_node_put(parent);
907
908 /* create config map per pin */
909 new_map++;
910 for (i = 0; i < grp->npins; i++) {
911 new_map[i].type = PIN_MAP_TYPE_CONFIGS_PIN;
912 new_map[i].data.configs.group_or_pin =
913 pin_get_name(pctldev, grp->pins[i]);
914 new_map[i].data.configs.configs = &grp->pin_conf[i].config;
915 new_map[i].data.configs.num_configs = 1;
916 }
917 dev_info(pctldev->dev, "maps: function %s group %s num %d\n",
918 (*map)->data.mux.function, grp->name, map_num);
919
920 return 0;
921 }
922
923 static void st_pctl_dt_free_map(struct pinctrl_dev *pctldev,
924 struct pinctrl_map *map, unsigned num_maps)
925 {
926 }
927
928 static struct pinctrl_ops st_pctlops = {
929 .get_groups_count = st_pctl_get_groups_count,
930 .get_group_pins = st_pctl_get_group_pins,
931 .get_group_name = st_pctl_get_group_name,
932 .dt_node_to_map = st_pctl_dt_node_to_map,
933 .dt_free_map = st_pctl_dt_free_map,
934 };
935
936 /* Pinmux */
937 static int st_pmx_get_funcs_count(struct pinctrl_dev *pctldev)
938 {
939 struct st_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
940
941 return info->nfunctions;
942 }
943
944 static const char *st_pmx_get_fname(struct pinctrl_dev *pctldev,
945 unsigned selector)
946 {
947 struct st_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
948
949 return info->functions[selector].name;
950 }
951
952 static int st_pmx_get_groups(struct pinctrl_dev *pctldev,
953 unsigned selector, const char * const **grps, unsigned * const ngrps)
954 {
955 struct st_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
956 *grps = info->functions[selector].groups;
957 *ngrps = info->functions[selector].ngroups;
958
959 return 0;
960 }
961
962 static int st_pmx_set_mux(struct pinctrl_dev *pctldev, unsigned fselector,
963 unsigned group)
964 {
965 struct st_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
966 struct st_pinconf *conf = info->groups[group].pin_conf;
967 struct st_pio_control *pc;
968 int i;
969
970 for (i = 0; i < info->groups[group].npins; i++) {
971 pc = st_get_pio_control(pctldev, conf[i].pin);
972 st_pctl_set_function(pc, conf[i].pin, conf[i].altfunc);
973 }
974
975 return 0;
976 }
977
978 static int st_pmx_set_gpio_direction(struct pinctrl_dev *pctldev,
979 struct pinctrl_gpio_range *range, unsigned gpio,
980 bool input)
981 {
982 struct st_gpio_bank *bank = gpio_range_to_bank(range);
983 /*
984 * When a PIO bank is used in its primary function mode (altfunc = 0)
985 * Output Enable (OE), Open Drain(OD), and Pull Up (PU)
986 * for the primary PIO functions are driven by the related PIO block
987 */
988 st_pctl_set_function(&bank->pc, gpio, 0);
989 st_gpio_direction(bank, gpio, input ?
990 ST_GPIO_DIRECTION_IN : ST_GPIO_DIRECTION_OUT);
991
992 return 0;
993 }
994
995 static struct pinmux_ops st_pmxops = {
996 .get_functions_count = st_pmx_get_funcs_count,
997 .get_function_name = st_pmx_get_fname,
998 .get_function_groups = st_pmx_get_groups,
999 .set_mux = st_pmx_set_mux,
1000 .gpio_set_direction = st_pmx_set_gpio_direction,
1001 };
1002
1003 /* Pinconf */
1004 static void st_pinconf_get_retime(struct st_pinctrl *info,
1005 struct st_pio_control *pc, int pin, unsigned long *config)
1006 {
1007 if (info->data->rt_style == st_retime_style_packed)
1008 st_pinconf_get_retime_packed(info, pc, pin, config);
1009 else if (info->data->rt_style == st_retime_style_dedicated)
1010 if ((BIT(pin) & pc->rt_pin_mask))
1011 st_pinconf_get_retime_dedicated(info, pc,
1012 pin, config);
1013 }
1014
1015 static void st_pinconf_set_retime(struct st_pinctrl *info,
1016 struct st_pio_control *pc, int pin, unsigned long config)
1017 {
1018 if (info->data->rt_style == st_retime_style_packed)
1019 st_pinconf_set_retime_packed(info, pc, config, pin);
1020 else if (info->data->rt_style == st_retime_style_dedicated)
1021 if ((BIT(pin) & pc->rt_pin_mask))
1022 st_pinconf_set_retime_dedicated(info, pc,
1023 config, pin);
1024 }
1025
1026 static int st_pinconf_set(struct pinctrl_dev *pctldev, unsigned pin_id,
1027 unsigned long *configs, unsigned num_configs)
1028 {
1029 int pin = st_gpio_pin(pin_id);
1030 struct st_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
1031 struct st_pio_control *pc = st_get_pio_control(pctldev, pin_id);
1032 int i;
1033
1034 for (i = 0; i < num_configs; i++) {
1035 st_pinconf_set_config(pc, pin, configs[i]);
1036 st_pinconf_set_retime(info, pc, pin, configs[i]);
1037 } /* for each config */
1038
1039 return 0;
1040 }
1041
1042 static int st_pinconf_get(struct pinctrl_dev *pctldev,
1043 unsigned pin_id, unsigned long *config)
1044 {
1045 int pin = st_gpio_pin(pin_id);
1046 struct st_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
1047 struct st_pio_control *pc = st_get_pio_control(pctldev, pin_id);
1048
1049 *config = 0;
1050 st_pinconf_get_direction(pc, pin, config);
1051 st_pinconf_get_retime(info, pc, pin, config);
1052
1053 return 0;
1054 }
1055
1056 static void st_pinconf_dbg_show(struct pinctrl_dev *pctldev,
1057 struct seq_file *s, unsigned pin_id)
1058 {
1059 struct st_pio_control *pc;
1060 unsigned long config;
1061 unsigned int function;
1062 int offset = st_gpio_pin(pin_id);
1063 char f[16];
1064
1065 mutex_unlock(&pctldev->mutex);
1066 pc = st_get_pio_control(pctldev, pin_id);
1067 st_pinconf_get(pctldev, pin_id, &config);
1068 mutex_lock(&pctldev->mutex);
1069
1070 function = st_pctl_get_pin_function(pc, offset);
1071 if (function)
1072 snprintf(f, 10, "Alt Fn %d", function);
1073 else
1074 snprintf(f, 5, "GPIO");
1075
1076 seq_printf(s, "[OE:%d,PU:%ld,OD:%ld]\t%s\n"
1077 "\t\t[retime:%ld,invclk:%ld,clknotdat:%ld,"
1078 "de:%ld,rt-clk:%ld,rt-delay:%ld]",
1079 !st_gpio_get_direction(&pc_to_bank(pc)->gpio_chip, offset),
1080 ST_PINCONF_UNPACK_PU(config),
1081 ST_PINCONF_UNPACK_OD(config),
1082 f,
1083 ST_PINCONF_UNPACK_RT(config),
1084 ST_PINCONF_UNPACK_RT_INVERTCLK(config),
1085 ST_PINCONF_UNPACK_RT_CLKNOTDATA(config),
1086 ST_PINCONF_UNPACK_RT_DOUBLE_EDGE(config),
1087 ST_PINCONF_UNPACK_RT_CLK(config),
1088 ST_PINCONF_UNPACK_RT_DELAY(config));
1089 }
1090
1091 static struct pinconf_ops st_confops = {
1092 .pin_config_get = st_pinconf_get,
1093 .pin_config_set = st_pinconf_set,
1094 .pin_config_dbg_show = st_pinconf_dbg_show,
1095 };
1096
1097 static void st_pctl_dt_child_count(struct st_pinctrl *info,
1098 struct device_node *np)
1099 {
1100 struct device_node *child;
1101 for_each_child_of_node(np, child) {
1102 if (of_property_read_bool(child, "gpio-controller")) {
1103 info->nbanks++;
1104 } else {
1105 info->nfunctions++;
1106 info->ngroups += of_get_child_count(child);
1107 }
1108 }
1109 }
1110
1111 static int st_pctl_dt_setup_retime_packed(struct st_pinctrl *info,
1112 int bank, struct st_pio_control *pc)
1113 {
1114 struct device *dev = info->dev;
1115 struct regmap *rm = info->regmap;
1116 const struct st_pctl_data *data = info->data;
1117 /* 2 registers per bank */
1118 int reg = (data->rt + bank * RT_P_CFGS_PER_BANK) * 4;
1119 struct st_retime_packed *rt_p = &pc->rt.rt_p;
1120 /* cfg0 */
1121 struct reg_field clk1notclk0 = RT_P_CFG0_CLK1NOTCLK0_FIELD(reg);
1122 struct reg_field delay_0 = RT_P_CFG0_DELAY_0_FIELD(reg);
1123 struct reg_field delay_1 = RT_P_CFG0_DELAY_1_FIELD(reg);
1124 /* cfg1 */
1125 struct reg_field invertclk = RT_P_CFG1_INVERTCLK_FIELD(reg + 4);
1126 struct reg_field retime = RT_P_CFG1_RETIME_FIELD(reg + 4);
1127 struct reg_field clknotdata = RT_P_CFG1_CLKNOTDATA_FIELD(reg + 4);
1128 struct reg_field double_edge = RT_P_CFG1_DOUBLE_EDGE_FIELD(reg + 4);
1129
1130 rt_p->clk1notclk0 = devm_regmap_field_alloc(dev, rm, clk1notclk0);
1131 rt_p->delay_0 = devm_regmap_field_alloc(dev, rm, delay_0);
1132 rt_p->delay_1 = devm_regmap_field_alloc(dev, rm, delay_1);
1133 rt_p->invertclk = devm_regmap_field_alloc(dev, rm, invertclk);
1134 rt_p->retime = devm_regmap_field_alloc(dev, rm, retime);
1135 rt_p->clknotdata = devm_regmap_field_alloc(dev, rm, clknotdata);
1136 rt_p->double_edge = devm_regmap_field_alloc(dev, rm, double_edge);
1137
1138 if (IS_ERR(rt_p->clk1notclk0) || IS_ERR(rt_p->delay_0) ||
1139 IS_ERR(rt_p->delay_1) || IS_ERR(rt_p->invertclk) ||
1140 IS_ERR(rt_p->retime) || IS_ERR(rt_p->clknotdata) ||
1141 IS_ERR(rt_p->double_edge))
1142 return -EINVAL;
1143
1144 return 0;
1145 }
1146
1147 static int st_pctl_dt_setup_retime_dedicated(struct st_pinctrl *info,
1148 int bank, struct st_pio_control *pc)
1149 {
1150 struct device *dev = info->dev;
1151 struct regmap *rm = info->regmap;
1152 const struct st_pctl_data *data = info->data;
1153 /* 8 registers per bank */
1154 int reg_offset = (data->rt + bank * RT_D_CFGS_PER_BANK) * 4;
1155 struct st_retime_dedicated *rt_d = &pc->rt.rt_d;
1156 unsigned int j;
1157 u32 pin_mask = pc->rt_pin_mask;
1158
1159 for (j = 0; j < RT_D_CFGS_PER_BANK; j++) {
1160 if (BIT(j) & pin_mask) {
1161 struct reg_field reg = REG_FIELD(reg_offset, 0, 31);
1162 rt_d->rt[j] = devm_regmap_field_alloc(dev, rm, reg);
1163 if (IS_ERR(rt_d->rt[j]))
1164 return -EINVAL;
1165 reg_offset += 4;
1166 }
1167 }
1168 return 0;
1169 }
1170
1171 static int st_pctl_dt_setup_retime(struct st_pinctrl *info,
1172 int bank, struct st_pio_control *pc)
1173 {
1174 const struct st_pctl_data *data = info->data;
1175 if (data->rt_style == st_retime_style_packed)
1176 return st_pctl_dt_setup_retime_packed(info, bank, pc);
1177 else if (data->rt_style == st_retime_style_dedicated)
1178 return st_pctl_dt_setup_retime_dedicated(info, bank, pc);
1179
1180 return -EINVAL;
1181 }
1182
1183
1184 static struct regmap_field *st_pc_get_value(struct device *dev,
1185 struct regmap *regmap, int bank,
1186 int data, int lsb, int msb)
1187 {
1188 struct reg_field reg = REG_FIELD((data + bank) * 4, lsb, msb);
1189
1190 if (data < 0)
1191 return NULL;
1192
1193 return devm_regmap_field_alloc(dev, regmap, reg);
1194 }
1195
1196 static void st_parse_syscfgs(struct st_pinctrl *info, int bank,
1197 struct device_node *np)
1198 {
1199 const struct st_pctl_data *data = info->data;
1200 /**
1201 * For a given shared register like OE/PU/OD, there are 8 bits per bank
1202 * 0:7 belongs to bank0, 8:15 belongs to bank1 ...
1203 * So each register is shared across 4 banks.
1204 */
1205 int lsb = (bank%4) * ST_GPIO_PINS_PER_BANK;
1206 int msb = lsb + ST_GPIO_PINS_PER_BANK - 1;
1207 struct st_pio_control *pc = &info->banks[bank].pc;
1208 struct device *dev = info->dev;
1209 struct regmap *regmap = info->regmap;
1210
1211 pc->alt = st_pc_get_value(dev, regmap, bank, data->alt, 0, 31);
1212 pc->oe = st_pc_get_value(dev, regmap, bank/4, data->oe, lsb, msb);
1213 pc->pu = st_pc_get_value(dev, regmap, bank/4, data->pu, lsb, msb);
1214 pc->od = st_pc_get_value(dev, regmap, bank/4, data->od, lsb, msb);
1215
1216 /* retime avaiable for all pins by default */
1217 pc->rt_pin_mask = 0xff;
1218 of_property_read_u32(np, "st,retime-pin-mask", &pc->rt_pin_mask);
1219 st_pctl_dt_setup_retime(info, bank, pc);
1220
1221 return;
1222 }
1223
1224 /*
1225 * Each pin is represented in of the below forms.
1226 * <bank offset mux direction rt_type rt_delay rt_clk>
1227 */
1228 static int st_pctl_dt_parse_groups(struct device_node *np,
1229 struct st_pctl_group *grp, struct st_pinctrl *info, int idx)
1230 {
1231 /* bank pad direction val altfunction */
1232 const __be32 *list;
1233 struct property *pp;
1234 struct st_pinconf *conf;
1235 struct device_node *pins;
1236 int i = 0, npins = 0, nr_props;
1237
1238 pins = of_get_child_by_name(np, "st,pins");
1239 if (!pins)
1240 return -ENODATA;
1241
1242 for_each_property_of_node(pins, pp) {
1243 /* Skip those we do not want to proceed */
1244 if (!strcmp(pp->name, "name"))
1245 continue;
1246
1247 if (pp && (pp->length/sizeof(__be32)) >= OF_GPIO_ARGS_MIN) {
1248 npins++;
1249 } else {
1250 pr_warn("Invalid st,pins in %s node\n", np->name);
1251 return -EINVAL;
1252 }
1253 }
1254
1255 grp->npins = npins;
1256 grp->name = np->name;
1257 grp->pins = devm_kzalloc(info->dev, npins * sizeof(u32), GFP_KERNEL);
1258 grp->pin_conf = devm_kzalloc(info->dev,
1259 npins * sizeof(*conf), GFP_KERNEL);
1260
1261 if (!grp->pins || !grp->pin_conf)
1262 return -ENOMEM;
1263
1264 /* <bank offset mux direction rt_type rt_delay rt_clk> */
1265 for_each_property_of_node(pins, pp) {
1266 if (!strcmp(pp->name, "name"))
1267 continue;
1268 nr_props = pp->length/sizeof(u32);
1269 list = pp->value;
1270 conf = &grp->pin_conf[i];
1271
1272 /* bank & offset */
1273 be32_to_cpup(list++);
1274 be32_to_cpup(list++);
1275 conf->pin = of_get_named_gpio(pins, pp->name, 0);
1276 conf->name = pp->name;
1277 grp->pins[i] = conf->pin;
1278 /* mux */
1279 conf->altfunc = be32_to_cpup(list++);
1280 conf->config = 0;
1281 /* direction */
1282 conf->config |= be32_to_cpup(list++);
1283 /* rt_type rt_delay rt_clk */
1284 if (nr_props >= OF_GPIO_ARGS_MIN + OF_RT_ARGS_MIN) {
1285 /* rt_type */
1286 conf->config |= be32_to_cpup(list++);
1287 /* rt_delay */
1288 conf->config |= be32_to_cpup(list++);
1289 /* rt_clk */
1290 if (nr_props > OF_GPIO_ARGS_MIN + OF_RT_ARGS_MIN)
1291 conf->config |= be32_to_cpup(list++);
1292 }
1293 i++;
1294 }
1295 of_node_put(pins);
1296
1297 return 0;
1298 }
1299
1300 static int st_pctl_parse_functions(struct device_node *np,
1301 struct st_pinctrl *info, u32 index, int *grp_index)
1302 {
1303 struct device_node *child;
1304 struct st_pmx_func *func;
1305 struct st_pctl_group *grp;
1306 int ret, i;
1307
1308 func = &info->functions[index];
1309 func->name = np->name;
1310 func->ngroups = of_get_child_count(np);
1311 if (func->ngroups == 0) {
1312 dev_err(info->dev, "No groups defined\n");
1313 return -EINVAL;
1314 }
1315 func->groups = devm_kzalloc(info->dev,
1316 func->ngroups * sizeof(char *), GFP_KERNEL);
1317 if (!func->groups)
1318 return -ENOMEM;
1319
1320 i = 0;
1321 for_each_child_of_node(np, child) {
1322 func->groups[i] = child->name;
1323 grp = &info->groups[*grp_index];
1324 *grp_index += 1;
1325 ret = st_pctl_dt_parse_groups(child, grp, info, i++);
1326 if (ret)
1327 return ret;
1328 }
1329 dev_info(info->dev, "Function[%d\t name:%s,\tgroups:%d]\n",
1330 index, func->name, func->ngroups);
1331
1332 return 0;
1333 }
1334
1335 static void st_gpio_irq_mask(struct irq_data *d)
1336 {
1337 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
1338 struct st_gpio_bank *bank = gpio_chip_to_bank(gc);
1339
1340 writel(BIT(d->hwirq), bank->base + REG_PIO_CLR_PMASK);
1341 }
1342
1343 static void st_gpio_irq_unmask(struct irq_data *d)
1344 {
1345 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
1346 struct st_gpio_bank *bank = gpio_chip_to_bank(gc);
1347
1348 writel(BIT(d->hwirq), bank->base + REG_PIO_SET_PMASK);
1349 }
1350
1351 static int st_gpio_irq_set_type(struct irq_data *d, unsigned type)
1352 {
1353 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
1354 struct st_gpio_bank *bank = gpio_chip_to_bank(gc);
1355 unsigned long flags;
1356 int comp, pin = d->hwirq;
1357 u32 val;
1358 u32 pin_edge_conf = 0;
1359
1360 switch (type) {
1361 case IRQ_TYPE_LEVEL_HIGH:
1362 comp = 0;
1363 break;
1364 case IRQ_TYPE_EDGE_FALLING:
1365 comp = 0;
1366 pin_edge_conf = ST_IRQ_FALLING_EDGE_CONF(pin);
1367 break;
1368 case IRQ_TYPE_LEVEL_LOW:
1369 comp = 1;
1370 break;
1371 case IRQ_TYPE_EDGE_RISING:
1372 comp = 1;
1373 pin_edge_conf = ST_IRQ_RISING_EDGE_CONF(pin);
1374 break;
1375 case IRQ_TYPE_EDGE_BOTH:
1376 comp = st_gpio_get(&bank->gpio_chip, pin);
1377 pin_edge_conf = ST_IRQ_BOTH_EDGE_CONF(pin);
1378 break;
1379 default:
1380 return -EINVAL;
1381 }
1382
1383 spin_lock_irqsave(&bank->lock, flags);
1384 bank->irq_edge_conf &= ~(ST_IRQ_EDGE_MASK << (
1385 pin * ST_IRQ_EDGE_CONF_BITS_PER_PIN));
1386 bank->irq_edge_conf |= pin_edge_conf;
1387 spin_unlock_irqrestore(&bank->lock, flags);
1388
1389 val = readl(bank->base + REG_PIO_PCOMP);
1390 val &= ~BIT(pin);
1391 val |= (comp << pin);
1392 writel(val, bank->base + REG_PIO_PCOMP);
1393
1394 return 0;
1395 }
1396
1397 /*
1398 * As edge triggers are not supported at hardware level, it is supported by
1399 * software by exploiting the level trigger support in hardware.
1400 *
1401 * Steps for detection raising edge interrupt in software.
1402 *
1403 * Step 1: CONFIGURE pin to detect level LOW interrupts.
1404 *
1405 * Step 2: DETECT level LOW interrupt and in irqmux/gpio bank interrupt handler,
1406 * if the value of pin is low, then CONFIGURE pin for level HIGH interrupt.
1407 * IGNORE calling the actual interrupt handler for the pin at this stage.
1408 *
1409 * Step 3: DETECT level HIGH interrupt and in irqmux/gpio-bank interrupt handler
1410 * if the value of pin is HIGH, CONFIGURE pin for level LOW interrupt and then
1411 * DISPATCH the interrupt to the interrupt handler of the pin.
1412 *
1413 * step-1 ________ __________
1414 * | | step - 3
1415 * | |
1416 * step -2 |_____|
1417 *
1418 * falling edge is also detected int the same way.
1419 *
1420 */
1421 static void __gpio_irq_handler(struct st_gpio_bank *bank)
1422 {
1423 unsigned long port_in, port_mask, port_comp, active_irqs;
1424 unsigned long bank_edge_mask, flags;
1425 int n, val, ecfg;
1426
1427 spin_lock_irqsave(&bank->lock, flags);
1428 bank_edge_mask = bank->irq_edge_conf;
1429 spin_unlock_irqrestore(&bank->lock, flags);
1430
1431 for (;;) {
1432 port_in = readl(bank->base + REG_PIO_PIN);
1433 port_comp = readl(bank->base + REG_PIO_PCOMP);
1434 port_mask = readl(bank->base + REG_PIO_PMASK);
1435
1436 active_irqs = (port_in ^ port_comp) & port_mask;
1437
1438 if (active_irqs == 0)
1439 break;
1440
1441 for_each_set_bit(n, &active_irqs, BITS_PER_LONG) {
1442 /* check if we are detecting fake edges ... */
1443 ecfg = ST_IRQ_EDGE_CONF(bank_edge_mask, n);
1444
1445 if (ecfg) {
1446 /* edge detection. */
1447 val = st_gpio_get(&bank->gpio_chip, n);
1448
1449 writel(BIT(n),
1450 val ? bank->base + REG_PIO_SET_PCOMP :
1451 bank->base + REG_PIO_CLR_PCOMP);
1452
1453 if (ecfg != ST_IRQ_EDGE_BOTH &&
1454 !((ecfg & ST_IRQ_EDGE_FALLING) ^ val))
1455 continue;
1456 }
1457
1458 generic_handle_irq(irq_find_mapping(bank->gpio_chip.irqdomain, n));
1459 }
1460 }
1461 }
1462
1463 static void st_gpio_irq_handler(unsigned irq, struct irq_desc *desc)
1464 {
1465 /* interrupt dedicated per bank */
1466 struct irq_chip *chip = irq_get_chip(irq);
1467 struct gpio_chip *gc = irq_desc_get_handler_data(desc);
1468 struct st_gpio_bank *bank = gpio_chip_to_bank(gc);
1469
1470 chained_irq_enter(chip, desc);
1471 __gpio_irq_handler(bank);
1472 chained_irq_exit(chip, desc);
1473 }
1474
1475 static void st_gpio_irqmux_handler(unsigned irq, struct irq_desc *desc)
1476 {
1477 struct irq_chip *chip = irq_get_chip(irq);
1478 struct st_pinctrl *info = irq_get_handler_data(irq);
1479 unsigned long status;
1480 int n;
1481
1482 chained_irq_enter(chip, desc);
1483
1484 status = readl(info->irqmux_base);
1485
1486 for_each_set_bit(n, &status, info->nbanks)
1487 __gpio_irq_handler(&info->banks[n]);
1488
1489 chained_irq_exit(chip, desc);
1490 }
1491
1492 static struct gpio_chip st_gpio_template = {
1493 .request = st_gpio_request,
1494 .free = st_gpio_free,
1495 .get = st_gpio_get,
1496 .set = st_gpio_set,
1497 .direction_input = st_gpio_direction_input,
1498 .direction_output = st_gpio_direction_output,
1499 .get_direction = st_gpio_get_direction,
1500 .ngpio = ST_GPIO_PINS_PER_BANK,
1501 .of_gpio_n_cells = 1,
1502 .of_xlate = st_gpio_xlate,
1503 };
1504
1505 static struct irq_chip st_gpio_irqchip = {
1506 .name = "GPIO",
1507 .irq_disable = st_gpio_irq_mask,
1508 .irq_mask = st_gpio_irq_mask,
1509 .irq_unmask = st_gpio_irq_unmask,
1510 .irq_set_type = st_gpio_irq_set_type,
1511 .flags = IRQCHIP_SKIP_SET_WAKE,
1512 };
1513
1514 static int st_gpiolib_register_bank(struct st_pinctrl *info,
1515 int bank_nr, struct device_node *np)
1516 {
1517 struct st_gpio_bank *bank = &info->banks[bank_nr];
1518 struct pinctrl_gpio_range *range = &bank->range;
1519 struct device *dev = info->dev;
1520 int bank_num = of_alias_get_id(np, "gpio");
1521 struct resource res, irq_res;
1522 int gpio_irq = 0, err;
1523
1524 if (of_address_to_resource(np, 0, &res))
1525 return -ENODEV;
1526
1527 bank->base = devm_ioremap_resource(dev, &res);
1528 if (IS_ERR(bank->base))
1529 return PTR_ERR(bank->base);
1530
1531 bank->gpio_chip = st_gpio_template;
1532 bank->gpio_chip.base = bank_num * ST_GPIO_PINS_PER_BANK;
1533 bank->gpio_chip.ngpio = ST_GPIO_PINS_PER_BANK;
1534 bank->gpio_chip.of_node = np;
1535 bank->gpio_chip.dev = dev;
1536 spin_lock_init(&bank->lock);
1537
1538 of_property_read_string(np, "st,bank-name", &range->name);
1539 bank->gpio_chip.label = range->name;
1540
1541 range->id = bank_num;
1542 range->pin_base = range->base = range->id * ST_GPIO_PINS_PER_BANK;
1543 range->npins = bank->gpio_chip.ngpio;
1544 range->gc = &bank->gpio_chip;
1545 err = gpiochip_add(&bank->gpio_chip);
1546 if (err) {
1547 dev_err(dev, "Failed to add gpiochip(%d)!\n", bank_num);
1548 return err;
1549 }
1550 dev_info(dev, "%s bank added.\n", range->name);
1551
1552 /**
1553 * GPIO bank can have one of the two possible types of
1554 * interrupt-wirings.
1555 *
1556 * First type is via irqmux, single interrupt is used by multiple
1557 * gpio banks. This reduces number of overall interrupts numbers
1558 * required. All these banks belong to a single pincontroller.
1559 * _________
1560 * | |----> [gpio-bank (n) ]
1561 * | |----> [gpio-bank (n + 1)]
1562 * [irqN]-- | irq-mux |----> [gpio-bank (n + 2)]
1563 * | |----> [gpio-bank (... )]
1564 * |_________|----> [gpio-bank (n + 7)]
1565 *
1566 * Second type has a dedicated interrupt per each gpio bank.
1567 *
1568 * [irqN]----> [gpio-bank (n)]
1569 */
1570
1571 if (of_irq_to_resource(np, 0, &irq_res)) {
1572 gpio_irq = irq_res.start;
1573 gpiochip_set_chained_irqchip(&bank->gpio_chip, &st_gpio_irqchip,
1574 gpio_irq, st_gpio_irq_handler);
1575 }
1576
1577 if (info->irqmux_base || gpio_irq > 0) {
1578 err = gpiochip_irqchip_add(&bank->gpio_chip, &st_gpio_irqchip,
1579 0, handle_simple_irq,
1580 IRQ_TYPE_LEVEL_LOW);
1581 if (err) {
1582 gpiochip_remove(&bank->gpio_chip);
1583 dev_info(dev, "could not add irqchip\n");
1584 return err;
1585 }
1586 } else {
1587 dev_info(dev, "No IRQ support for %s bank\n", np->full_name);
1588 }
1589
1590 return 0;
1591 }
1592
1593 static const struct of_device_id st_pctl_of_match[] = {
1594 { .compatible = "st,stih415-sbc-pinctrl", .data = &stih415_sbc_data },
1595 { .compatible = "st,stih415-rear-pinctrl", .data = &stih415_rear_data },
1596 { .compatible = "st,stih415-left-pinctrl", .data = &stih415_left_data },
1597 { .compatible = "st,stih415-right-pinctrl",
1598 .data = &stih415_right_data },
1599 { .compatible = "st,stih415-front-pinctrl",
1600 .data = &stih415_front_data },
1601 { .compatible = "st,stih416-sbc-pinctrl", .data = &stih416_data},
1602 { .compatible = "st,stih416-front-pinctrl", .data = &stih416_data},
1603 { .compatible = "st,stih416-rear-pinctrl", .data = &stih416_data},
1604 { .compatible = "st,stih416-fvdp-fe-pinctrl", .data = &stih416_data},
1605 { .compatible = "st,stih416-fvdp-lite-pinctrl", .data = &stih416_data},
1606 { .compatible = "st,stih407-sbc-pinctrl", .data = &stih416_data},
1607 { .compatible = "st,stih407-front-pinctrl", .data = &stih416_data},
1608 { .compatible = "st,stih407-rear-pinctrl", .data = &stih416_data},
1609 { .compatible = "st,stih407-flash-pinctrl", .data = &stih407_flashdata},
1610 { /* sentinel */ }
1611 };
1612
1613 static int st_pctl_probe_dt(struct platform_device *pdev,
1614 struct pinctrl_desc *pctl_desc, struct st_pinctrl *info)
1615 {
1616 int ret = 0;
1617 int i = 0, j = 0, k = 0, bank;
1618 struct pinctrl_pin_desc *pdesc;
1619 struct device_node *np = pdev->dev.of_node;
1620 struct device_node *child;
1621 int grp_index = 0;
1622 int irq = 0;
1623 struct resource *res;
1624
1625 st_pctl_dt_child_count(info, np);
1626 if (!info->nbanks) {
1627 dev_err(&pdev->dev, "you need atleast one gpio bank\n");
1628 return -EINVAL;
1629 }
1630
1631 dev_info(&pdev->dev, "nbanks = %d\n", info->nbanks);
1632 dev_info(&pdev->dev, "nfunctions = %d\n", info->nfunctions);
1633 dev_info(&pdev->dev, "ngroups = %d\n", info->ngroups);
1634
1635 info->functions = devm_kzalloc(&pdev->dev,
1636 info->nfunctions * sizeof(*info->functions), GFP_KERNEL);
1637
1638 info->groups = devm_kzalloc(&pdev->dev,
1639 info->ngroups * sizeof(*info->groups) , GFP_KERNEL);
1640
1641 info->banks = devm_kzalloc(&pdev->dev,
1642 info->nbanks * sizeof(*info->banks), GFP_KERNEL);
1643
1644 if (!info->functions || !info->groups || !info->banks)
1645 return -ENOMEM;
1646
1647 info->regmap = syscon_regmap_lookup_by_phandle(np, "st,syscfg");
1648 if (IS_ERR(info->regmap)) {
1649 dev_err(info->dev, "No syscfg phandle specified\n");
1650 return PTR_ERR(info->regmap);
1651 }
1652 info->data = of_match_node(st_pctl_of_match, np)->data;
1653
1654 irq = platform_get_irq(pdev, 0);
1655
1656 if (irq > 0) {
1657 res = platform_get_resource_byname(pdev,
1658 IORESOURCE_MEM, "irqmux");
1659 info->irqmux_base = devm_ioremap_resource(&pdev->dev, res);
1660
1661 if (IS_ERR(info->irqmux_base))
1662 return PTR_ERR(info->irqmux_base);
1663
1664 irq_set_chained_handler(irq, st_gpio_irqmux_handler);
1665 irq_set_handler_data(irq, info);
1666
1667 }
1668
1669 pctl_desc->npins = info->nbanks * ST_GPIO_PINS_PER_BANK;
1670 pdesc = devm_kzalloc(&pdev->dev,
1671 sizeof(*pdesc) * pctl_desc->npins, GFP_KERNEL);
1672 if (!pdesc)
1673 return -ENOMEM;
1674
1675 pctl_desc->pins = pdesc;
1676
1677 bank = 0;
1678 for_each_child_of_node(np, child) {
1679 if (of_property_read_bool(child, "gpio-controller")) {
1680 const char *bank_name = NULL;
1681 ret = st_gpiolib_register_bank(info, bank, child);
1682 if (ret)
1683 return ret;
1684
1685 k = info->banks[bank].range.pin_base;
1686 bank_name = info->banks[bank].range.name;
1687 for (j = 0; j < ST_GPIO_PINS_PER_BANK; j++, k++) {
1688 pdesc->number = k;
1689 pdesc->name = kasprintf(GFP_KERNEL, "%s[%d]",
1690 bank_name, j);
1691 pdesc++;
1692 }
1693 st_parse_syscfgs(info, bank, child);
1694 bank++;
1695 } else {
1696 ret = st_pctl_parse_functions(child, info,
1697 i++, &grp_index);
1698 if (ret) {
1699 dev_err(&pdev->dev, "No functions found.\n");
1700 return ret;
1701 }
1702 }
1703 }
1704
1705 return 0;
1706 }
1707
1708 static int st_pctl_probe(struct platform_device *pdev)
1709 {
1710 struct st_pinctrl *info;
1711 struct pinctrl_desc *pctl_desc;
1712 int ret, i;
1713
1714 if (!pdev->dev.of_node) {
1715 dev_err(&pdev->dev, "device node not found.\n");
1716 return -EINVAL;
1717 }
1718
1719 pctl_desc = devm_kzalloc(&pdev->dev, sizeof(*pctl_desc), GFP_KERNEL);
1720 if (!pctl_desc)
1721 return -ENOMEM;
1722
1723 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
1724 if (!info)
1725 return -ENOMEM;
1726
1727 info->dev = &pdev->dev;
1728 platform_set_drvdata(pdev, info);
1729 ret = st_pctl_probe_dt(pdev, pctl_desc, info);
1730 if (ret)
1731 return ret;
1732
1733 pctl_desc->owner = THIS_MODULE;
1734 pctl_desc->pctlops = &st_pctlops;
1735 pctl_desc->pmxops = &st_pmxops;
1736 pctl_desc->confops = &st_confops;
1737 pctl_desc->name = dev_name(&pdev->dev);
1738
1739 info->pctl = pinctrl_register(pctl_desc, &pdev->dev, info);
1740 if (!info->pctl) {
1741 dev_err(&pdev->dev, "Failed pinctrl registration\n");
1742 return -EINVAL;
1743 }
1744
1745 for (i = 0; i < info->nbanks; i++)
1746 pinctrl_add_gpio_range(info->pctl, &info->banks[i].range);
1747
1748 return 0;
1749 }
1750
1751 static struct platform_driver st_pctl_driver = {
1752 .driver = {
1753 .name = "st-pinctrl",
1754 .of_match_table = st_pctl_of_match,
1755 },
1756 .probe = st_pctl_probe,
1757 };
1758
1759 static int __init st_pctl_init(void)
1760 {
1761 return platform_driver_register(&st_pctl_driver);
1762 }
1763 arch_initcall(st_pctl_init);
Linux with added FPC-III support