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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Microsemi/Microchip SoCs serial gpio driver
4 *
5 * Author: Lars Povlsen <lars.povlsen@microchip.com>
6 *
7 * Copyright (c) 2020 Microchip Technology Inc. and its subsidiaries.
8 */
9
10#include <linux/bitfield.h>
11#include <linux/bits.h>
12#include <linux/clk.h>
13#include <linux/gpio/driver.h>
14#include <linux/io.h>
15#include <linux/mod_devicetable.h>
16#include <linux/module.h>
17#include <linux/pinctrl/pinmux.h>
18#include <linux/platform_device.h>
19#include <linux/property.h>
20
21#include "core.h"
22#include "pinconf.h"
23
24#define SGPIO_BITS_PER_WORD 32
25#define SGPIO_MAX_BITS 4
26#define SGPIO_SRC_BITS 3 /* 3 bit wide field per pin */
27
28enum {
29 REG_INPUT_DATA,
30 REG_PORT_CONFIG,
31 REG_PORT_ENABLE,
32 REG_SIO_CONFIG,
33 REG_SIO_CLOCK,
34 REG_INT_POLARITY,
35 REG_INT_TRIGGER,
36 REG_INT_ACK,
37 REG_INT_ENABLE,
38 REG_INT_IDENT,
39 MAXREG
40};
41
42enum {
43 SGPIO_ARCH_LUTON,
44 SGPIO_ARCH_OCELOT,
45 SGPIO_ARCH_SPARX5,
46};
47
48enum {
49 SGPIO_FLAGS_HAS_IRQ = BIT(0),
50};
51
52struct sgpio_properties {
53 int arch;
54 int flags;
55 u8 regoff[MAXREG];
56};
57
58#define SGPIO_LUTON_AUTO_REPEAT BIT(5)
59#define SGPIO_LUTON_PORT_WIDTH GENMASK(3, 2)
60#define SGPIO_LUTON_CLK_FREQ GENMASK(11, 0)
61#define SGPIO_LUTON_BIT_SOURCE GENMASK(11, 0)
62
63#define SGPIO_OCELOT_AUTO_REPEAT BIT(10)
64#define SGPIO_OCELOT_PORT_WIDTH GENMASK(8, 7)
65#define SGPIO_OCELOT_CLK_FREQ GENMASK(19, 8)
66#define SGPIO_OCELOT_BIT_SOURCE GENMASK(23, 12)
67
68#define SGPIO_SPARX5_AUTO_REPEAT BIT(6)
69#define SGPIO_SPARX5_PORT_WIDTH GENMASK(4, 3)
70#define SGPIO_SPARX5_CLK_FREQ GENMASK(19, 8)
71#define SGPIO_SPARX5_BIT_SOURCE GENMASK(23, 12)
72
73#define SGPIO_MASTER_INTR_ENA BIT(0)
74
75#define SGPIO_INT_TRG_LEVEL 0
76#define SGPIO_INT_TRG_EDGE 1
77#define SGPIO_INT_TRG_EDGE_FALL 2
78#define SGPIO_INT_TRG_EDGE_RISE 3
79
80#define SGPIO_TRG_LEVEL_HIGH 0
81#define SGPIO_TRG_LEVEL_LOW 1
82
83static const struct sgpio_properties properties_luton = {
84 .arch = SGPIO_ARCH_LUTON,
85 .regoff = { 0x00, 0x09, 0x29, 0x2a, 0x2b },
86};
87
88static const struct sgpio_properties properties_ocelot = {
89 .arch = SGPIO_ARCH_OCELOT,
90 .regoff = { 0x00, 0x06, 0x26, 0x04, 0x05 },
91};
92
93static const struct sgpio_properties properties_sparx5 = {
94 .arch = SGPIO_ARCH_SPARX5,
95 .flags = SGPIO_FLAGS_HAS_IRQ,
96 .regoff = { 0x00, 0x06, 0x26, 0x04, 0x05, 0x2a, 0x32, 0x3a, 0x3e, 0x42 },
97};
98
99static const char * const functions[] = { "gpio" };
100
101struct sgpio_bank {
102 struct sgpio_priv *priv;
103 bool is_input;
104 struct gpio_chip gpio;
105 struct pinctrl_desc pctl_desc;
106};
107
108struct sgpio_priv {
109 struct device *dev;
110 struct sgpio_bank in;
111 struct sgpio_bank out;
112 u32 bitcount;
113 u32 ports;
114 u32 clock;
115 u32 __iomem *regs;
116 const struct sgpio_properties *properties;
117};
118
119struct sgpio_port_addr {
120 u8 port;
121 u8 bit;
122};
123
124static inline void sgpio_pin_to_addr(struct sgpio_priv *priv, int pin,
125 struct sgpio_port_addr *addr)
126{
127 addr->port = pin / priv->bitcount;
128 addr->bit = pin % priv->bitcount;
129}
130
131static inline int sgpio_addr_to_pin(struct sgpio_priv *priv, int port, int bit)
132{
133 return bit + port * priv->bitcount;
134}
135
136static inline u32 sgpio_readl(struct sgpio_priv *priv, u32 rno, u32 off)
137{
138 u32 __iomem *reg = &priv->regs[priv->properties->regoff[rno] + off];
139
140 return readl(reg);
141}
142
143static inline void sgpio_writel(struct sgpio_priv *priv,
144 u32 val, u32 rno, u32 off)
145{
146 u32 __iomem *reg = &priv->regs[priv->properties->regoff[rno] + off];
147
148 writel(val, reg);
149}
150
151static inline void sgpio_clrsetbits(struct sgpio_priv *priv,
152 u32 rno, u32 off, u32 clear, u32 set)
153{
154 u32 __iomem *reg = &priv->regs[priv->properties->regoff[rno] + off];
155 u32 val = readl(reg);
156
157 val &= ~clear;
158 val |= set;
159
160 writel(val, reg);
161}
162
163static inline void sgpio_configure_bitstream(struct sgpio_priv *priv)
164{
165 int width = priv->bitcount - 1;
166 u32 clr, set;
167
168 switch (priv->properties->arch) {
169 case SGPIO_ARCH_LUTON:
170 clr = SGPIO_LUTON_PORT_WIDTH;
171 set = SGPIO_LUTON_AUTO_REPEAT |
172 FIELD_PREP(SGPIO_LUTON_PORT_WIDTH, width);
173 break;
174 case SGPIO_ARCH_OCELOT:
175 clr = SGPIO_OCELOT_PORT_WIDTH;
176 set = SGPIO_OCELOT_AUTO_REPEAT |
177 FIELD_PREP(SGPIO_OCELOT_PORT_WIDTH, width);
178 break;
179 case SGPIO_ARCH_SPARX5:
180 clr = SGPIO_SPARX5_PORT_WIDTH;
181 set = SGPIO_SPARX5_AUTO_REPEAT |
182 FIELD_PREP(SGPIO_SPARX5_PORT_WIDTH, width);
183 break;
184 default:
185 return;
186 }
187 sgpio_clrsetbits(priv, REG_SIO_CONFIG, 0, clr, set);
188}
189
190static inline void sgpio_configure_clock(struct sgpio_priv *priv, u32 clkfrq)
191{
192 u32 clr, set;
193
194 switch (priv->properties->arch) {
195 case SGPIO_ARCH_LUTON:
196 clr = SGPIO_LUTON_CLK_FREQ;
197 set = FIELD_PREP(SGPIO_LUTON_CLK_FREQ, clkfrq);
198 break;
199 case SGPIO_ARCH_OCELOT:
200 clr = SGPIO_OCELOT_CLK_FREQ;
201 set = FIELD_PREP(SGPIO_OCELOT_CLK_FREQ, clkfrq);
202 break;
203 case SGPIO_ARCH_SPARX5:
204 clr = SGPIO_SPARX5_CLK_FREQ;
205 set = FIELD_PREP(SGPIO_SPARX5_CLK_FREQ, clkfrq);
206 break;
207 default:
208 return;
209 }
210 sgpio_clrsetbits(priv, REG_SIO_CLOCK, 0, clr, set);
211}
212
213static void sgpio_output_set(struct sgpio_priv *priv,
214 struct sgpio_port_addr *addr,
215 int value)
216{
217 unsigned int bit = SGPIO_SRC_BITS * addr->bit;
218 u32 clr, set;
219
220 switch (priv->properties->arch) {
221 case SGPIO_ARCH_LUTON:
222 clr = FIELD_PREP(SGPIO_LUTON_BIT_SOURCE, BIT(bit));
223 set = FIELD_PREP(SGPIO_LUTON_BIT_SOURCE, value << bit);
224 break;
225 case SGPIO_ARCH_OCELOT:
226 clr = FIELD_PREP(SGPIO_OCELOT_BIT_SOURCE, BIT(bit));
227 set = FIELD_PREP(SGPIO_OCELOT_BIT_SOURCE, value << bit);
228 break;
229 case SGPIO_ARCH_SPARX5:
230 clr = FIELD_PREP(SGPIO_SPARX5_BIT_SOURCE, BIT(bit));
231 set = FIELD_PREP(SGPIO_SPARX5_BIT_SOURCE, value << bit);
232 break;
233 default:
234 return;
235 }
236 sgpio_clrsetbits(priv, REG_PORT_CONFIG, addr->port, clr, set);
237}
238
239static int sgpio_output_get(struct sgpio_priv *priv,
240 struct sgpio_port_addr *addr)
241{
242 u32 val, portval = sgpio_readl(priv, REG_PORT_CONFIG, addr->port);
243 unsigned int bit = SGPIO_SRC_BITS * addr->bit;
244
245 switch (priv->properties->arch) {
246 case SGPIO_ARCH_LUTON:
247 val = FIELD_GET(SGPIO_LUTON_BIT_SOURCE, portval);
248 break;
249 case SGPIO_ARCH_OCELOT:
250 val = FIELD_GET(SGPIO_OCELOT_BIT_SOURCE, portval);
251 break;
252 case SGPIO_ARCH_SPARX5:
253 val = FIELD_GET(SGPIO_SPARX5_BIT_SOURCE, portval);
254 break;
255 default:
256 val = 0;
257 break;
258 }
259 return !!(val & BIT(bit));
260}
261
262static int sgpio_input_get(struct sgpio_priv *priv,
263 struct sgpio_port_addr *addr)
264{
265 return !!(sgpio_readl(priv, REG_INPUT_DATA, addr->bit) & BIT(addr->port));
266}
267
268static int sgpio_pinconf_get(struct pinctrl_dev *pctldev,
269 unsigned int pin, unsigned long *config)
270{
271 struct sgpio_bank *bank = pinctrl_dev_get_drvdata(pctldev);
272 u32 param = pinconf_to_config_param(*config);
273 struct sgpio_priv *priv = bank->priv;
274 struct sgpio_port_addr addr;
275 int val;
276
277 sgpio_pin_to_addr(priv, pin, &addr);
278
279 switch (param) {
280 case PIN_CONFIG_INPUT_ENABLE:
281 val = bank->is_input;
282 break;
283
284 case PIN_CONFIG_OUTPUT_ENABLE:
285 val = !bank->is_input;
286 break;
287
288 case PIN_CONFIG_OUTPUT:
289 if (bank->is_input)
290 return -EINVAL;
291 val = sgpio_output_get(priv, &addr);
292 break;
293
294 default:
295 return -ENOTSUPP;
296 }
297
298 *config = pinconf_to_config_packed(param, val);
299
300 return 0;
301}
302
303static int sgpio_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
304 unsigned long *configs, unsigned int num_configs)
305{
306 struct sgpio_bank *bank = pinctrl_dev_get_drvdata(pctldev);
307 struct sgpio_priv *priv = bank->priv;
308 struct sgpio_port_addr addr;
309 int cfg, err = 0;
310 u32 param, arg;
311
312 sgpio_pin_to_addr(priv, pin, &addr);
313
314 for (cfg = 0; cfg < num_configs; cfg++) {
315 param = pinconf_to_config_param(configs[cfg]);
316 arg = pinconf_to_config_argument(configs[cfg]);
317
318 switch (param) {
319 case PIN_CONFIG_OUTPUT:
320 if (bank->is_input)
321 return -EINVAL;
322 sgpio_output_set(priv, &addr, arg);
323 break;
324
325 default:
326 err = -ENOTSUPP;
327 }
328 }
329
330 return err;
331}
332
333static const struct pinconf_ops sgpio_confops = {
334 .is_generic = true,
335 .pin_config_get = sgpio_pinconf_get,
336 .pin_config_set = sgpio_pinconf_set,
337 .pin_config_config_dbg_show = pinconf_generic_dump_config,
338};
339
340static int sgpio_get_functions_count(struct pinctrl_dev *pctldev)
341{
342 return 1;
343}
344
345static const char *sgpio_get_function_name(struct pinctrl_dev *pctldev,
346 unsigned int function)
347{
348 return functions[0];
349}
350
351static int sgpio_get_function_groups(struct pinctrl_dev *pctldev,
352 unsigned int function,
353 const char *const **groups,
354 unsigned *const num_groups)
355{
356 *groups = functions;
357 *num_groups = ARRAY_SIZE(functions);
358
359 return 0;
360}
361
362static int sgpio_pinmux_set_mux(struct pinctrl_dev *pctldev,
363 unsigned int selector, unsigned int group)
364{
365 return 0;
366}
367
368static int sgpio_gpio_set_direction(struct pinctrl_dev *pctldev,
369 struct pinctrl_gpio_range *range,
370 unsigned int pin, bool input)
371{
372 struct sgpio_bank *bank = pinctrl_dev_get_drvdata(pctldev);
373
374 return (input == bank->is_input) ? 0 : -EINVAL;
375}
376
377static int sgpio_gpio_request_enable(struct pinctrl_dev *pctldev,
378 struct pinctrl_gpio_range *range,
379 unsigned int offset)
380{
381 struct sgpio_bank *bank = pinctrl_dev_get_drvdata(pctldev);
382 struct sgpio_priv *priv = bank->priv;
383 struct sgpio_port_addr addr;
384
385 sgpio_pin_to_addr(priv, offset, &addr);
386
387 if ((priv->ports & BIT(addr.port)) == 0) {
388 dev_warn(priv->dev, "Request port %d.%d: Port is not enabled\n",
389 addr.port, addr.bit);
390 return -EINVAL;
391 }
392
393 return 0;
394}
395
396static const struct pinmux_ops sgpio_pmx_ops = {
397 .get_functions_count = sgpio_get_functions_count,
398 .get_function_name = sgpio_get_function_name,
399 .get_function_groups = sgpio_get_function_groups,
400 .set_mux = sgpio_pinmux_set_mux,
401 .gpio_set_direction = sgpio_gpio_set_direction,
402 .gpio_request_enable = sgpio_gpio_request_enable,
403};
404
405static int sgpio_pctl_get_groups_count(struct pinctrl_dev *pctldev)
406{
407 struct sgpio_bank *bank = pinctrl_dev_get_drvdata(pctldev);
408
409 return bank->pctl_desc.npins;
410}
411
412static const char *sgpio_pctl_get_group_name(struct pinctrl_dev *pctldev,
413 unsigned int group)
414{
415 struct sgpio_bank *bank = pinctrl_dev_get_drvdata(pctldev);
416
417 return bank->pctl_desc.pins[group].name;
418}
419
420static int sgpio_pctl_get_group_pins(struct pinctrl_dev *pctldev,
421 unsigned int group,
422 const unsigned int **pins,
423 unsigned int *num_pins)
424{
425 struct sgpio_bank *bank = pinctrl_dev_get_drvdata(pctldev);
426
427 *pins = &bank->pctl_desc.pins[group].number;
428 *num_pins = 1;
429
430 return 0;
431}
432
433static const struct pinctrl_ops sgpio_pctl_ops = {
434 .get_groups_count = sgpio_pctl_get_groups_count,
435 .get_group_name = sgpio_pctl_get_group_name,
436 .get_group_pins = sgpio_pctl_get_group_pins,
437 .dt_node_to_map = pinconf_generic_dt_node_to_map_pin,
438 .dt_free_map = pinconf_generic_dt_free_map,
439};
440
441static int microchip_sgpio_direction_input(struct gpio_chip *gc, unsigned int gpio)
442{
443 struct sgpio_bank *bank = gpiochip_get_data(gc);
444
445 /* Fixed-position function */
446 return bank->is_input ? 0 : -EINVAL;
447}
448
449static int microchip_sgpio_direction_output(struct gpio_chip *gc,
450 unsigned int gpio, int value)
451{
452 struct sgpio_bank *bank = gpiochip_get_data(gc);
453 struct sgpio_priv *priv = bank->priv;
454 struct sgpio_port_addr addr;
455
456 /* Fixed-position function */
457 if (bank->is_input)
458 return -EINVAL;
459
460 sgpio_pin_to_addr(priv, gpio, &addr);
461
462 sgpio_output_set(priv, &addr, value);
463
464 return 0;
465}
466
467static int microchip_sgpio_get_direction(struct gpio_chip *gc, unsigned int gpio)
468{
469 struct sgpio_bank *bank = gpiochip_get_data(gc);
470
471 return bank->is_input ? GPIO_LINE_DIRECTION_IN : GPIO_LINE_DIRECTION_OUT;
472}
473
474static void microchip_sgpio_set_value(struct gpio_chip *gc,
475 unsigned int gpio, int value)
476{
477 microchip_sgpio_direction_output(gc, gpio, value);
478}
479
480static int microchip_sgpio_get_value(struct gpio_chip *gc, unsigned int gpio)
481{
482 struct sgpio_bank *bank = gpiochip_get_data(gc);
483 struct sgpio_priv *priv = bank->priv;
484 struct sgpio_port_addr addr;
485
486 sgpio_pin_to_addr(priv, gpio, &addr);
487
488 return bank->is_input ? sgpio_input_get(priv, &addr) : sgpio_output_get(priv, &addr);
489}
490
491static int microchip_sgpio_of_xlate(struct gpio_chip *gc,
492 const struct of_phandle_args *gpiospec,
493 u32 *flags)
494{
495 struct sgpio_bank *bank = gpiochip_get_data(gc);
496 struct sgpio_priv *priv = bank->priv;
497 int pin;
498
499 /*
500 * Note that the SGIO pin is defined by *2* numbers, a port
501 * number between 0 and 31, and a bit index, 0 to 3.
502 */
503 if (gpiospec->args[0] > SGPIO_BITS_PER_WORD ||
504 gpiospec->args[1] > priv->bitcount)
505 return -EINVAL;
506
507 pin = sgpio_addr_to_pin(priv, gpiospec->args[0], gpiospec->args[1]);
508
509 if (pin > gc->ngpio)
510 return -EINVAL;
511
512 if (flags)
513 *flags = gpiospec->args[2];
514
515 return pin;
516}
517
518static int microchip_sgpio_get_ports(struct sgpio_priv *priv)
519{
520 const char *range_property_name = "microchip,sgpio-port-ranges";
521 struct device *dev = priv->dev;
522 u32 range_params[64];
523 int i, nranges, ret;
524
525 /* Calculate port mask */
526 nranges = device_property_count_u32(dev, range_property_name);
527 if (nranges < 2 || nranges % 2 || nranges > ARRAY_SIZE(range_params)) {
528 dev_err(dev, "%s port range: '%s' property\n",
529 nranges == -EINVAL ? "Missing" : "Invalid",
530 range_property_name);
531 return -EINVAL;
532 }
533
534 ret = device_property_read_u32_array(dev, range_property_name,
535 range_params, nranges);
536 if (ret) {
537 dev_err(dev, "failed to parse '%s' property: %d\n",
538 range_property_name, ret);
539 return ret;
540 }
541 for (i = 0; i < nranges; i += 2) {
542 int start, end;
543
544 start = range_params[i];
545 end = range_params[i + 1];
546 if (start > end || end >= SGPIO_BITS_PER_WORD) {
547 dev_err(dev, "Ill-formed port-range [%d:%d]\n",
548 start, end);
549 }
550 priv->ports |= GENMASK(end, start);
551 }
552
553 return 0;
554}
555
556static void microchip_sgpio_irq_settype(struct irq_data *data,
557 int type,
558 int polarity)
559{
560 struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
561 struct sgpio_bank *bank = gpiochip_get_data(chip);
562 unsigned int gpio = irqd_to_hwirq(data);
563 struct sgpio_port_addr addr;
564 u32 ena;
565
566 sgpio_pin_to_addr(bank->priv, gpio, &addr);
567
568 /* Disable interrupt while changing type */
569 ena = sgpio_readl(bank->priv, REG_INT_ENABLE, addr.bit);
570 sgpio_writel(bank->priv, ena & ~BIT(addr.port), REG_INT_ENABLE, addr.bit);
571
572 /* Type value spread over 2 registers sets: low, high bit */
573 sgpio_clrsetbits(bank->priv, REG_INT_TRIGGER, addr.bit,
574 BIT(addr.port), (!!(type & 0x1)) << addr.port);
575 sgpio_clrsetbits(bank->priv, REG_INT_TRIGGER, SGPIO_MAX_BITS + addr.bit,
576 BIT(addr.port), (!!(type & 0x2)) << addr.port);
577
578 if (type == SGPIO_INT_TRG_LEVEL)
579 sgpio_clrsetbits(bank->priv, REG_INT_POLARITY, addr.bit,
580 BIT(addr.port), polarity << addr.port);
581
582 /* Possibly re-enable interrupts */
583 sgpio_writel(bank->priv, ena, REG_INT_ENABLE, addr.bit);
584}
585
586static void microchip_sgpio_irq_setreg(struct irq_data *data,
587 int reg,
588 bool clear)
589{
590 struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
591 struct sgpio_bank *bank = gpiochip_get_data(chip);
592 unsigned int gpio = irqd_to_hwirq(data);
593 struct sgpio_port_addr addr;
594
595 sgpio_pin_to_addr(bank->priv, gpio, &addr);
596
597 if (clear)
598 sgpio_clrsetbits(bank->priv, reg, addr.bit, BIT(addr.port), 0);
599 else
600 sgpio_clrsetbits(bank->priv, reg, addr.bit, 0, BIT(addr.port));
601}
602
603static void microchip_sgpio_irq_mask(struct irq_data *data)
604{
605 microchip_sgpio_irq_setreg(data, REG_INT_ENABLE, true);
606}
607
608static void microchip_sgpio_irq_unmask(struct irq_data *data)
609{
610 microchip_sgpio_irq_setreg(data, REG_INT_ENABLE, false);
611}
612
613static void microchip_sgpio_irq_ack(struct irq_data *data)
614{
615 microchip_sgpio_irq_setreg(data, REG_INT_ACK, false);
616}
617
618static int microchip_sgpio_irq_set_type(struct irq_data *data, unsigned int type)
619{
620 type &= IRQ_TYPE_SENSE_MASK;
621
622 switch (type) {
623 case IRQ_TYPE_EDGE_BOTH:
624 irq_set_handler_locked(data, handle_edge_irq);
625 microchip_sgpio_irq_settype(data, SGPIO_INT_TRG_EDGE, 0);
626 break;
627 case IRQ_TYPE_EDGE_RISING:
628 irq_set_handler_locked(data, handle_edge_irq);
629 microchip_sgpio_irq_settype(data, SGPIO_INT_TRG_EDGE_RISE, 0);
630 break;
631 case IRQ_TYPE_EDGE_FALLING:
632 irq_set_handler_locked(data, handle_edge_irq);
633 microchip_sgpio_irq_settype(data, SGPIO_INT_TRG_EDGE_FALL, 0);
634 break;
635 case IRQ_TYPE_LEVEL_HIGH:
636 irq_set_handler_locked(data, handle_level_irq);
637 microchip_sgpio_irq_settype(data, SGPIO_INT_TRG_LEVEL, SGPIO_TRG_LEVEL_HIGH);
638 break;
639 case IRQ_TYPE_LEVEL_LOW:
640 irq_set_handler_locked(data, handle_level_irq);
641 microchip_sgpio_irq_settype(data, SGPIO_INT_TRG_LEVEL, SGPIO_TRG_LEVEL_LOW);
642 break;
643 default:
644 return -EINVAL;
645 }
646
647 return 0;
648}
649
650static const struct irq_chip microchip_sgpio_irqchip = {
651 .name = "gpio",
652 .irq_mask = microchip_sgpio_irq_mask,
653 .irq_ack = microchip_sgpio_irq_ack,
654 .irq_unmask = microchip_sgpio_irq_unmask,
655 .irq_set_type = microchip_sgpio_irq_set_type,
656};
657
658static void sgpio_irq_handler(struct irq_desc *desc)
659{
660 struct irq_chip *parent_chip = irq_desc_get_chip(desc);
661 struct gpio_chip *chip = irq_desc_get_handler_data(desc);
662 struct sgpio_bank *bank = gpiochip_get_data(chip);
663 struct sgpio_priv *priv = bank->priv;
664 int bit, port, gpio;
665 long val;
666
667 for (bit = 0; bit < priv->bitcount; bit++) {
668 val = sgpio_readl(priv, REG_INT_IDENT, bit);
669 if (!val)
670 continue;
671
672 chained_irq_enter(parent_chip, desc);
673
674 for_each_set_bit(port, &val, SGPIO_BITS_PER_WORD) {
675 gpio = sgpio_addr_to_pin(priv, port, bit);
676 generic_handle_irq(irq_linear_revmap(chip->irq.domain, gpio));
677 }
678
679 chained_irq_exit(parent_chip, desc);
680 }
681}
682
683static int microchip_sgpio_register_bank(struct device *dev,
684 struct sgpio_priv *priv,
685 struct fwnode_handle *fwnode,
686 int bankno)
687{
688 struct pinctrl_pin_desc *pins;
689 struct pinctrl_desc *pctl_desc;
690 struct pinctrl_dev *pctldev;
691 struct sgpio_bank *bank;
692 struct gpio_chip *gc;
693 u32 ngpios;
694 int i, ret;
695
696 /* Get overall bank struct */
697 bank = (bankno == 0) ? &priv->in : &priv->out;
698 bank->priv = priv;
699
700 if (fwnode_property_read_u32(fwnode, "ngpios", &ngpios)) {
701 dev_info(dev, "failed to get number of gpios for bank%d\n",
702 bankno);
703 ngpios = 64;
704 }
705
706 priv->bitcount = ngpios / SGPIO_BITS_PER_WORD;
707 if (priv->bitcount > SGPIO_MAX_BITS) {
708 dev_err(dev, "Bit width exceeds maximum (%d)\n",
709 SGPIO_MAX_BITS);
710 return -EINVAL;
711 }
712
713 pctl_desc = &bank->pctl_desc;
714 pctl_desc->name = devm_kasprintf(dev, GFP_KERNEL, "%s-%sput",
715 dev_name(dev),
716 bank->is_input ? "in" : "out");
717 pctl_desc->pctlops = &sgpio_pctl_ops;
718 pctl_desc->pmxops = &sgpio_pmx_ops;
719 pctl_desc->confops = &sgpio_confops;
720 pctl_desc->owner = THIS_MODULE;
721
722 pins = devm_kzalloc(dev, sizeof(*pins)*ngpios, GFP_KERNEL);
723 if (!pins)
724 return -ENOMEM;
725
726 pctl_desc->npins = ngpios;
727 pctl_desc->pins = pins;
728
729 for (i = 0; i < ngpios; i++) {
730 struct sgpio_port_addr addr;
731
732 sgpio_pin_to_addr(priv, i, &addr);
733
734 pins[i].number = i;
735 pins[i].name = devm_kasprintf(dev, GFP_KERNEL,
736 "SGPIO_%c_p%db%d",
737 bank->is_input ? 'I' : 'O',
738 addr.port, addr.bit);
739 if (!pins[i].name)
740 return -ENOMEM;
741 }
742
743 pctldev = devm_pinctrl_register(dev, pctl_desc, bank);
744 if (IS_ERR(pctldev))
745 return dev_err_probe(dev, PTR_ERR(pctldev), "Failed to register pinctrl\n");
746
747 gc = &bank->gpio;
748 gc->label = pctl_desc->name;
749 gc->parent = dev;
750 gc->of_node = to_of_node(fwnode);
751 gc->owner = THIS_MODULE;
752 gc->get_direction = microchip_sgpio_get_direction;
753 gc->direction_input = microchip_sgpio_direction_input;
754 gc->direction_output = microchip_sgpio_direction_output;
755 gc->get = microchip_sgpio_get_value;
756 gc->set = microchip_sgpio_set_value;
757 gc->request = gpiochip_generic_request;
758 gc->free = gpiochip_generic_free;
759 gc->of_xlate = microchip_sgpio_of_xlate;
760 gc->of_gpio_n_cells = 3;
761 gc->base = -1;
762 gc->ngpio = ngpios;
763
764 if (bank->is_input && priv->properties->flags & SGPIO_FLAGS_HAS_IRQ) {
765 int irq = fwnode_irq_get(fwnode, 0);
766
767 if (irq) {
768 struct gpio_irq_chip *girq = &gc->irq;
769
770 girq->chip = devm_kmemdup(dev, µchip_sgpio_irqchip,
771 sizeof(microchip_sgpio_irqchip),
772 GFP_KERNEL);
773 if (!girq->chip)
774 return -ENOMEM;
775 girq->parent_handler = sgpio_irq_handler;
776 girq->num_parents = 1;
777 girq->parents = devm_kcalloc(dev, 1,
778 sizeof(*girq->parents),
779 GFP_KERNEL);
780 if (!girq->parents)
781 return -ENOMEM;
782 girq->parents[0] = irq;
783 girq->default_type = IRQ_TYPE_NONE;
784 girq->handler = handle_bad_irq;
785
786 /* Disable all individual pins */
787 for (i = 0; i < SGPIO_MAX_BITS; i++)
788 sgpio_writel(priv, 0, REG_INT_ENABLE, i);
789 /* Master enable */
790 sgpio_clrsetbits(priv, REG_SIO_CONFIG, 0, 0, SGPIO_MASTER_INTR_ENA);
791 }
792 }
793
794 ret = devm_gpiochip_add_data(dev, gc, bank);
795 if (ret)
796 dev_err(dev, "Failed to register: ret %d\n", ret);
797
798 return ret;
799}
800
801static int microchip_sgpio_probe(struct platform_device *pdev)
802{
803 int div_clock = 0, ret, port, i, nbanks;
804 struct device *dev = &pdev->dev;
805 struct fwnode_handle *fwnode;
806 struct sgpio_priv *priv;
807 struct clk *clk;
808 u32 val;
809
810 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
811 if (!priv)
812 return -ENOMEM;
813
814 priv->dev = dev;
815
816 clk = devm_clk_get(dev, NULL);
817 if (IS_ERR(clk))
818 return dev_err_probe(dev, PTR_ERR(clk), "Failed to get clock\n");
819
820 div_clock = clk_get_rate(clk);
821 if (device_property_read_u32(dev, "bus-frequency", &priv->clock))
822 priv->clock = 12500000;
823 if (priv->clock == 0 || priv->clock > (div_clock / 2)) {
824 dev_err(dev, "Invalid frequency %d\n", priv->clock);
825 return -EINVAL;
826 }
827
828 priv->regs = devm_platform_ioremap_resource(pdev, 0);
829 if (IS_ERR(priv->regs))
830 return PTR_ERR(priv->regs);
831 priv->properties = device_get_match_data(dev);
832 priv->in.is_input = true;
833
834 /* Get rest of device properties */
835 ret = microchip_sgpio_get_ports(priv);
836 if (ret)
837 return ret;
838
839 nbanks = device_get_child_node_count(dev);
840 if (nbanks != 2) {
841 dev_err(dev, "Must have 2 banks (have %d)\n", nbanks);
842 return -EINVAL;
843 }
844
845 i = 0;
846 device_for_each_child_node(dev, fwnode) {
847 ret = microchip_sgpio_register_bank(dev, priv, fwnode, i++);
848 if (ret) {
849 fwnode_handle_put(fwnode);
850 return ret;
851 }
852 }
853
854 if (priv->in.gpio.ngpio != priv->out.gpio.ngpio) {
855 dev_err(dev, "Banks must have same GPIO count\n");
856 return -ERANGE;
857 }
858
859 sgpio_configure_bitstream(priv);
860
861 val = max(2U, div_clock / priv->clock);
862 sgpio_configure_clock(priv, val);
863
864 for (port = 0; port < SGPIO_BITS_PER_WORD; port++)
865 sgpio_writel(priv, 0, REG_PORT_CONFIG, port);
866 sgpio_writel(priv, priv->ports, REG_PORT_ENABLE, 0);
867
868 return 0;
869}
870
871static const struct of_device_id microchip_sgpio_gpio_of_match[] = {
872 {
873 .compatible = "microchip,sparx5-sgpio",
874 .data = &properties_sparx5,
875 }, {
876 .compatible = "mscc,luton-sgpio",
877 .data = &properties_luton,
878 }, {
879 .compatible = "mscc,ocelot-sgpio",
880 .data = &properties_ocelot,
881 }, {
882 /* sentinel */
883 }
884};
885
886static struct platform_driver microchip_sgpio_pinctrl_driver = {
887 .driver = {
888 .name = "pinctrl-microchip-sgpio",
889 .of_match_table = microchip_sgpio_gpio_of_match,
890 .suppress_bind_attrs = true,
891 },
892 .probe = microchip_sgpio_probe,
893};
894builtin_platform_driver(microchip_sgpio_pinctrl_driver);