1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Pinctrl / GPIO driver for StarFive JH7110 SoC
4  *
5  * Copyright (C) 2022 Emil Renner Berthing <kernel@esmil.dk>
6  * Copyright (C) 2022 StarFive Technology Co., Ltd.
7  */
8 
9 #include <linux/bits.h>
10 #include <linux/clk.h>
11 #include <linux/gpio/driver.h>
12 #include <linux/io.h>
13 #include <linux/mod_devicetable.h>
14 #include <linux/module.h>
15 #include <linux/mutex.h>
16 #include <linux/of.h>
17 #include <linux/platform_device.h>
18 #include <linux/reset.h>
19 #include <linux/seq_file.h>
20 #include <linux/spinlock.h>
21 
22 #include <linux/pinctrl/consumer.h>
23 #include <linux/pinctrl/pinconf.h>
24 #include <linux/pinctrl/pinctrl.h>
25 #include <linux/pinctrl/pinmux.h>
26 
27 #include <dt-bindings/pinctrl/starfive,jh7110-pinctrl.h>
28 
29 #include "../core.h"
30 #include "../pinctrl-utils.h"
31 #include "../pinmux.h"
32 #include "../pinconf.h"
33 #include "pinctrl-starfive-jh7110.h"
34 
35 /* pad control bits */
36 #define JH7110_PADCFG_POS	BIT(7)
37 #define JH7110_PADCFG_SMT	BIT(6)
38 #define JH7110_PADCFG_SLEW	BIT(5)
39 #define JH7110_PADCFG_PD	BIT(4)
40 #define JH7110_PADCFG_PU	BIT(3)
41 #define JH7110_PADCFG_BIAS	(JH7110_PADCFG_PD | JH7110_PADCFG_PU)
42 #define JH7110_PADCFG_DS_MASK	GENMASK(2, 1)
43 #define JH7110_PADCFG_DS_2MA	(0U << 1)
44 #define JH7110_PADCFG_DS_4MA	BIT(1)
45 #define JH7110_PADCFG_DS_8MA	(2U << 1)
46 #define JH7110_PADCFG_DS_12MA	(3U << 1)
47 #define JH7110_PADCFG_IE	BIT(0)
48 
49 /*
50  * The packed pinmux values from the device tree look like this:
51  *
52  *  | 31 - 24 | 23 - 16 | 15 - 10 |  9 - 8   | 7 - 0 |
53  *  |   din   |  dout   |  doen   | function |  pin  |
54  */
jh7110_pinmux_din(u32 v)55 static unsigned int jh7110_pinmux_din(u32 v)
56 {
57 	return (v & GENMASK(31, 24)) >> 24;
58 }
59 
jh7110_pinmux_dout(u32 v)60 static u32 jh7110_pinmux_dout(u32 v)
61 {
62 	return (v & GENMASK(23, 16)) >> 16;
63 }
64 
jh7110_pinmux_doen(u32 v)65 static u32 jh7110_pinmux_doen(u32 v)
66 {
67 	return (v & GENMASK(15, 10)) >> 10;
68 }
69 
jh7110_pinmux_function(u32 v)70 static u32 jh7110_pinmux_function(u32 v)
71 {
72 	return (v & GENMASK(9, 8)) >> 8;
73 }
74 
jh7110_pinmux_pin(u32 v)75 static unsigned int jh7110_pinmux_pin(u32 v)
76 {
77 	return v & GENMASK(7, 0);
78 }
79 
jh7110_from_irq_data(struct irq_data * d)80 static struct jh7110_pinctrl *jh7110_from_irq_data(struct irq_data *d)
81 {
82 	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
83 
84 	return container_of(gc, struct jh7110_pinctrl, gc);
85 }
86 
jh7110_from_irq_desc(struct irq_desc * desc)87 struct jh7110_pinctrl *jh7110_from_irq_desc(struct irq_desc *desc)
88 {
89 	struct gpio_chip *gc = irq_desc_get_handler_data(desc);
90 
91 	return container_of(gc, struct jh7110_pinctrl, gc);
92 }
93 EXPORT_SYMBOL_GPL(jh7110_from_irq_desc);
94 
95 #ifdef CONFIG_DEBUG_FS
jh7110_pin_dbg_show(struct pinctrl_dev * pctldev,struct seq_file * s,unsigned int pin)96 static void jh7110_pin_dbg_show(struct pinctrl_dev *pctldev,
97 				struct seq_file *s, unsigned int pin)
98 {
99 	struct jh7110_pinctrl *sfp = pinctrl_dev_get_drvdata(pctldev);
100 	const struct jh7110_pinctrl_soc_info *info = sfp->info;
101 
102 	seq_printf(s, "%s", dev_name(pctldev->dev));
103 
104 	if (pin < sfp->gc.ngpio) {
105 		unsigned int offset = 4 * (pin / 4);
106 		unsigned int shift  = 8 * (pin % 4);
107 		u32 dout = readl_relaxed(sfp->base + info->dout_reg_base + offset);
108 		u32 doen = readl_relaxed(sfp->base + info->doen_reg_base + offset);
109 		u32 gpi = readl_relaxed(sfp->base + info->gpi_reg_base + offset);
110 
111 		dout = (dout >> shift) & info->dout_mask;
112 		doen = (doen >> shift) & info->doen_mask;
113 		gpi = ((gpi >> shift) - 2) & info->gpi_mask;
114 
115 		seq_printf(s, " dout=%u doen=%u din=%u", dout, doen, gpi);
116 	}
117 }
118 #else
119 #define jh7110_pin_dbg_show NULL
120 #endif
121 
jh7110_dt_node_to_map(struct pinctrl_dev * pctldev,struct device_node * np,struct pinctrl_map ** maps,unsigned int * num_maps)122 static int jh7110_dt_node_to_map(struct pinctrl_dev *pctldev,
123 				 struct device_node *np,
124 				 struct pinctrl_map **maps,
125 				 unsigned int *num_maps)
126 {
127 	struct jh7110_pinctrl *sfp = pinctrl_dev_get_drvdata(pctldev);
128 	struct device *dev = sfp->gc.parent;
129 	struct device_node *child;
130 	struct pinctrl_map *map;
131 	const char **pgnames;
132 	const char *grpname;
133 	int ngroups;
134 	int nmaps;
135 	int ret;
136 
137 	ngroups = 0;
138 	for_each_available_child_of_node(np, child)
139 		ngroups += 1;
140 	nmaps = 2 * ngroups;
141 
142 	pgnames = devm_kcalloc(dev, ngroups, sizeof(*pgnames), GFP_KERNEL);
143 	if (!pgnames)
144 		return -ENOMEM;
145 
146 	map = kcalloc(nmaps, sizeof(*map), GFP_KERNEL);
147 	if (!map)
148 		return -ENOMEM;
149 
150 	nmaps = 0;
151 	ngroups = 0;
152 	mutex_lock(&sfp->mutex);
153 	for_each_available_child_of_node(np, child) {
154 		int npins = of_property_count_u32_elems(child, "pinmux");
155 		int *pins;
156 		u32 *pinmux;
157 		int i;
158 
159 		if (npins < 1) {
160 			dev_err(dev,
161 				"invalid pinctrl group %pOFn.%pOFn: pinmux not set\n",
162 				np, child);
163 			ret = -EINVAL;
164 			goto put_child;
165 		}
166 
167 		grpname = devm_kasprintf(dev, GFP_KERNEL, "%pOFn.%pOFn", np, child);
168 		if (!grpname) {
169 			ret = -ENOMEM;
170 			goto put_child;
171 		}
172 
173 		pgnames[ngroups++] = grpname;
174 
175 		pins = devm_kcalloc(dev, npins, sizeof(*pins), GFP_KERNEL);
176 		if (!pins) {
177 			ret = -ENOMEM;
178 			goto put_child;
179 		}
180 
181 		pinmux = devm_kcalloc(dev, npins, sizeof(*pinmux), GFP_KERNEL);
182 		if (!pinmux) {
183 			ret = -ENOMEM;
184 			goto put_child;
185 		}
186 
187 		ret = of_property_read_u32_array(child, "pinmux", pinmux, npins);
188 		if (ret)
189 			goto put_child;
190 
191 		for (i = 0; i < npins; i++)
192 			pins[i] = jh7110_pinmux_pin(pinmux[i]);
193 
194 		map[nmaps].type = PIN_MAP_TYPE_MUX_GROUP;
195 		map[nmaps].data.mux.function = np->name;
196 		map[nmaps].data.mux.group = grpname;
197 		nmaps += 1;
198 
199 		ret = pinctrl_generic_add_group(pctldev, grpname,
200 						pins, npins, pinmux);
201 		if (ret < 0) {
202 			dev_err(dev, "error adding group %s: %d\n", grpname, ret);
203 			goto put_child;
204 		}
205 
206 		ret = pinconf_generic_parse_dt_config(child, pctldev,
207 						      &map[nmaps].data.configs.configs,
208 						      &map[nmaps].data.configs.num_configs);
209 		if (ret) {
210 			dev_err(dev, "error parsing pin config of group %s: %d\n",
211 				grpname, ret);
212 			goto put_child;
213 		}
214 
215 		/* don't create a map if there are no pinconf settings */
216 		if (map[nmaps].data.configs.num_configs == 0)
217 			continue;
218 
219 		map[nmaps].type = PIN_MAP_TYPE_CONFIGS_GROUP;
220 		map[nmaps].data.configs.group_or_pin = grpname;
221 		nmaps += 1;
222 	}
223 
224 	ret = pinmux_generic_add_function(pctldev, np->name,
225 					  pgnames, ngroups, NULL);
226 	if (ret < 0) {
227 		dev_err(dev, "error adding function %s: %d\n", np->name, ret);
228 		goto free_map;
229 	}
230 	mutex_unlock(&sfp->mutex);
231 
232 	*maps = map;
233 	*num_maps = nmaps;
234 	return 0;
235 
236 put_child:
237 	of_node_put(child);
238 free_map:
239 	pinctrl_utils_free_map(pctldev, map, nmaps);
240 	mutex_unlock(&sfp->mutex);
241 	return ret;
242 }
243 
244 static const struct pinctrl_ops jh7110_pinctrl_ops = {
245 	.get_groups_count = pinctrl_generic_get_group_count,
246 	.get_group_name	  = pinctrl_generic_get_group_name,
247 	.get_group_pins   = pinctrl_generic_get_group_pins,
248 	.pin_dbg_show	  = jh7110_pin_dbg_show,
249 	.dt_node_to_map	  = jh7110_dt_node_to_map,
250 	.dt_free_map	  = pinctrl_utils_free_map,
251 };
252 
jh7110_set_gpiomux(struct jh7110_pinctrl * sfp,unsigned int pin,unsigned int din,u32 dout,u32 doen)253 void jh7110_set_gpiomux(struct jh7110_pinctrl *sfp, unsigned int pin,
254 			unsigned int din, u32 dout, u32 doen)
255 {
256 	const struct jh7110_pinctrl_soc_info *info = sfp->info;
257 
258 	unsigned int offset = 4 * (pin / 4);
259 	unsigned int shift  = 8 * (pin % 4);
260 	u32 dout_mask = info->dout_mask << shift;
261 	u32 done_mask = info->doen_mask << shift;
262 	u32 ival, imask;
263 	void __iomem *reg_dout;
264 	void __iomem *reg_doen;
265 	void __iomem *reg_din;
266 	unsigned long flags;
267 
268 	reg_dout = sfp->base + info->dout_reg_base + offset;
269 	reg_doen = sfp->base + info->doen_reg_base + offset;
270 	dout <<= shift;
271 	doen <<= shift;
272 	if (din != GPI_NONE) {
273 		unsigned int ioffset = 4 * (din / 4);
274 		unsigned int ishift  = 8 * (din % 4);
275 
276 		reg_din = sfp->base + info->gpi_reg_base + ioffset;
277 		ival = (pin + 2) << ishift;
278 		imask = info->gpi_mask << ishift;
279 	} else {
280 		reg_din = NULL;
281 	}
282 
283 	raw_spin_lock_irqsave(&sfp->lock, flags);
284 	dout |= readl_relaxed(reg_dout) & ~dout_mask;
285 	writel_relaxed(dout, reg_dout);
286 	doen |= readl_relaxed(reg_doen) & ~done_mask;
287 	writel_relaxed(doen, reg_doen);
288 	if (reg_din) {
289 		ival |= readl_relaxed(reg_din) & ~imask;
290 		writel_relaxed(ival, reg_din);
291 	}
292 	raw_spin_unlock_irqrestore(&sfp->lock, flags);
293 }
294 EXPORT_SYMBOL_GPL(jh7110_set_gpiomux);
295 
jh7110_set_mux(struct pinctrl_dev * pctldev,unsigned int fsel,unsigned int gsel)296 static int jh7110_set_mux(struct pinctrl_dev *pctldev,
297 			  unsigned int fsel, unsigned int gsel)
298 {
299 	struct jh7110_pinctrl *sfp = pinctrl_dev_get_drvdata(pctldev);
300 	const struct jh7110_pinctrl_soc_info *info = sfp->info;
301 	const struct group_desc *group;
302 	const u32 *pinmux;
303 	unsigned int i;
304 
305 	group = pinctrl_generic_get_group(pctldev, gsel);
306 	if (!group)
307 		return -EINVAL;
308 
309 	pinmux = group->data;
310 	for (i = 0; i < group->num_pins; i++) {
311 		u32 v = pinmux[i];
312 
313 		if (info->jh7110_set_one_pin_mux)
314 			info->jh7110_set_one_pin_mux(sfp,
315 					jh7110_pinmux_pin(v),
316 					jh7110_pinmux_din(v),
317 					jh7110_pinmux_dout(v),
318 					jh7110_pinmux_doen(v),
319 					jh7110_pinmux_function(v));
320 	}
321 
322 	return 0;
323 }
324 
325 static const struct pinmux_ops jh7110_pinmux_ops = {
326 	.get_functions_count = pinmux_generic_get_function_count,
327 	.get_function_name   = pinmux_generic_get_function_name,
328 	.get_function_groups = pinmux_generic_get_function_groups,
329 	.set_mux	     = jh7110_set_mux,
330 	.strict		     = true,
331 };
332 
333 static const u8 jh7110_drive_strength_mA[4] = { 2, 4, 8, 12 };
334 
jh7110_padcfg_ds_to_mA(u32 padcfg)335 static u32 jh7110_padcfg_ds_to_mA(u32 padcfg)
336 {
337 	return jh7110_drive_strength_mA[(padcfg >> 1) & 3U];
338 }
339 
jh7110_padcfg_ds_from_mA(u32 v)340 static u32 jh7110_padcfg_ds_from_mA(u32 v)
341 {
342 	int i;
343 
344 	for (i = 0; i < 3; i++) {
345 		if (v <= jh7110_drive_strength_mA[i])
346 			break;
347 	}
348 	return i << 1;
349 }
350 
jh7110_padcfg_rmw(struct jh7110_pinctrl * sfp,unsigned int pin,u32 mask,u32 value)351 static void jh7110_padcfg_rmw(struct jh7110_pinctrl *sfp,
352 			      unsigned int pin, u32 mask, u32 value)
353 {
354 	const struct jh7110_pinctrl_soc_info *info = sfp->info;
355 	void __iomem *reg;
356 	unsigned long flags;
357 	int padcfg_base;
358 
359 	if (!info->jh7110_get_padcfg_base)
360 		return;
361 
362 	padcfg_base = info->jh7110_get_padcfg_base(sfp, pin);
363 	if (padcfg_base < 0)
364 		return;
365 
366 	reg = sfp->base + padcfg_base + 4 * pin;
367 	value &= mask;
368 
369 	raw_spin_lock_irqsave(&sfp->lock, flags);
370 	value |= readl_relaxed(reg) & ~mask;
371 	writel_relaxed(value, reg);
372 	raw_spin_unlock_irqrestore(&sfp->lock, flags);
373 }
374 
jh7110_pinconf_get(struct pinctrl_dev * pctldev,unsigned int pin,unsigned long * config)375 static int jh7110_pinconf_get(struct pinctrl_dev *pctldev,
376 			      unsigned int pin, unsigned long *config)
377 {
378 	struct jh7110_pinctrl *sfp = pinctrl_dev_get_drvdata(pctldev);
379 	const struct jh7110_pinctrl_soc_info *info = sfp->info;
380 	int param = pinconf_to_config_param(*config);
381 	u32 padcfg, arg;
382 	bool enabled;
383 	int padcfg_base;
384 
385 	if (!info->jh7110_get_padcfg_base)
386 		return 0;
387 
388 	padcfg_base = info->jh7110_get_padcfg_base(sfp, pin);
389 	if (padcfg_base < 0)
390 		return 0;
391 
392 	padcfg = readl_relaxed(sfp->base + padcfg_base + 4 * pin);
393 	switch (param) {
394 	case PIN_CONFIG_BIAS_DISABLE:
395 		enabled = !(padcfg & JH7110_PADCFG_BIAS);
396 		arg = 0;
397 		break;
398 	case PIN_CONFIG_BIAS_PULL_DOWN:
399 		enabled = padcfg & JH7110_PADCFG_PD;
400 		arg = 1;
401 		break;
402 	case PIN_CONFIG_BIAS_PULL_UP:
403 		enabled = padcfg & JH7110_PADCFG_PU;
404 		arg = 1;
405 		break;
406 	case PIN_CONFIG_DRIVE_STRENGTH:
407 		enabled = true;
408 		arg = jh7110_padcfg_ds_to_mA(padcfg);
409 		break;
410 	case PIN_CONFIG_INPUT_ENABLE:
411 		enabled = padcfg & JH7110_PADCFG_IE;
412 		arg = enabled;
413 		break;
414 	case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
415 		enabled = padcfg & JH7110_PADCFG_SMT;
416 		arg = enabled;
417 		break;
418 	case PIN_CONFIG_SLEW_RATE:
419 		enabled = true;
420 		arg = !!(padcfg & JH7110_PADCFG_SLEW);
421 		break;
422 	default:
423 		return -ENOTSUPP;
424 	}
425 
426 	*config = pinconf_to_config_packed(param, arg);
427 	return enabled ? 0 : -EINVAL;
428 }
429 
jh7110_pinconf_group_get(struct pinctrl_dev * pctldev,unsigned int gsel,unsigned long * config)430 static int jh7110_pinconf_group_get(struct pinctrl_dev *pctldev,
431 				    unsigned int gsel,
432 				    unsigned long *config)
433 {
434 	const struct group_desc *group;
435 
436 	group = pinctrl_generic_get_group(pctldev, gsel);
437 	if (!group)
438 		return -EINVAL;
439 
440 	return jh7110_pinconf_get(pctldev, group->pins[0], config);
441 }
442 
jh7110_pinconf_group_set(struct pinctrl_dev * pctldev,unsigned int gsel,unsigned long * configs,unsigned int num_configs)443 static int jh7110_pinconf_group_set(struct pinctrl_dev *pctldev,
444 				    unsigned int gsel,
445 				    unsigned long *configs,
446 				    unsigned int num_configs)
447 {
448 	struct jh7110_pinctrl *sfp = pinctrl_dev_get_drvdata(pctldev);
449 	const struct group_desc *group;
450 	u16 mask, value;
451 	int i;
452 
453 	group = pinctrl_generic_get_group(pctldev, gsel);
454 	if (!group)
455 		return -EINVAL;
456 
457 	mask = 0;
458 	value = 0;
459 	for (i = 0; i < num_configs; i++) {
460 		int param = pinconf_to_config_param(configs[i]);
461 		u32 arg = pinconf_to_config_argument(configs[i]);
462 
463 		switch (param) {
464 		case PIN_CONFIG_BIAS_DISABLE:
465 			mask |= JH7110_PADCFG_BIAS;
466 			value &= ~JH7110_PADCFG_BIAS;
467 			break;
468 		case PIN_CONFIG_BIAS_PULL_DOWN:
469 			if (arg == 0)
470 				return -ENOTSUPP;
471 			mask |= JH7110_PADCFG_BIAS;
472 			value = (value & ~JH7110_PADCFG_BIAS) | JH7110_PADCFG_PD;
473 			break;
474 		case PIN_CONFIG_BIAS_PULL_UP:
475 			if (arg == 0)
476 				return -ENOTSUPP;
477 			mask |= JH7110_PADCFG_BIAS;
478 			value = (value & ~JH7110_PADCFG_BIAS) | JH7110_PADCFG_PU;
479 			break;
480 		case PIN_CONFIG_DRIVE_STRENGTH:
481 			mask |= JH7110_PADCFG_DS_MASK;
482 			value = (value & ~JH7110_PADCFG_DS_MASK) |
483 				jh7110_padcfg_ds_from_mA(arg);
484 			break;
485 		case PIN_CONFIG_INPUT_ENABLE:
486 			mask |= JH7110_PADCFG_IE;
487 			if (arg)
488 				value |= JH7110_PADCFG_IE;
489 			else
490 				value &= ~JH7110_PADCFG_IE;
491 			break;
492 		case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
493 			mask |= JH7110_PADCFG_SMT;
494 			if (arg)
495 				value |= JH7110_PADCFG_SMT;
496 			else
497 				value &= ~JH7110_PADCFG_SMT;
498 			break;
499 		case PIN_CONFIG_SLEW_RATE:
500 			mask |= JH7110_PADCFG_SLEW;
501 			if (arg)
502 				value |= JH7110_PADCFG_SLEW;
503 			else
504 				value &= ~JH7110_PADCFG_SLEW;
505 			break;
506 		default:
507 			return -ENOTSUPP;
508 		}
509 	}
510 
511 	for (i = 0; i < group->num_pins; i++)
512 		jh7110_padcfg_rmw(sfp, group->pins[i], mask, value);
513 
514 	return 0;
515 }
516 
517 #ifdef CONFIG_DEBUG_FS
jh7110_pinconf_dbg_show(struct pinctrl_dev * pctldev,struct seq_file * s,unsigned int pin)518 static void jh7110_pinconf_dbg_show(struct pinctrl_dev *pctldev,
519 				    struct seq_file *s, unsigned int pin)
520 {
521 	struct jh7110_pinctrl *sfp = pinctrl_dev_get_drvdata(pctldev);
522 	const struct jh7110_pinctrl_soc_info *info = sfp->info;
523 	u32 value;
524 	int padcfg_base;
525 
526 	if (!info->jh7110_get_padcfg_base)
527 		return;
528 
529 	padcfg_base = info->jh7110_get_padcfg_base(sfp, pin);
530 	if (padcfg_base < 0)
531 		return;
532 
533 	value = readl_relaxed(sfp->base + padcfg_base + 4 * pin);
534 	seq_printf(s, " (0x%02x)", value);
535 }
536 #else
537 #define jh7110_pinconf_dbg_show NULL
538 #endif
539 
540 static const struct pinconf_ops jh7110_pinconf_ops = {
541 	.pin_config_get		= jh7110_pinconf_get,
542 	.pin_config_group_get	= jh7110_pinconf_group_get,
543 	.pin_config_group_set	= jh7110_pinconf_group_set,
544 	.pin_config_dbg_show	= jh7110_pinconf_dbg_show,
545 	.is_generic		= true,
546 };
547 
jh7110_gpio_request(struct gpio_chip * gc,unsigned int gpio)548 static int jh7110_gpio_request(struct gpio_chip *gc, unsigned int gpio)
549 {
550 	return pinctrl_gpio_request(gc->base + gpio);
551 }
552 
jh7110_gpio_free(struct gpio_chip * gc,unsigned int gpio)553 static void jh7110_gpio_free(struct gpio_chip *gc, unsigned int gpio)
554 {
555 	pinctrl_gpio_free(gc->base + gpio);
556 }
557 
jh7110_gpio_get_direction(struct gpio_chip * gc,unsigned int gpio)558 static int jh7110_gpio_get_direction(struct gpio_chip *gc,
559 				     unsigned int gpio)
560 {
561 	struct jh7110_pinctrl *sfp = container_of(gc,
562 			struct jh7110_pinctrl, gc);
563 	const struct jh7110_pinctrl_soc_info *info = sfp->info;
564 	unsigned int offset = 4 * (gpio / 4);
565 	unsigned int shift  = 8 * (gpio % 4);
566 	u32 doen = readl_relaxed(sfp->base + info->doen_reg_base + offset);
567 
568 	doen = (doen >> shift) & info->doen_mask;
569 
570 	return doen == GPOEN_ENABLE ?
571 		GPIO_LINE_DIRECTION_OUT : GPIO_LINE_DIRECTION_IN;
572 }
573 
jh7110_gpio_direction_input(struct gpio_chip * gc,unsigned int gpio)574 static int jh7110_gpio_direction_input(struct gpio_chip *gc,
575 				       unsigned int gpio)
576 {
577 	struct jh7110_pinctrl *sfp = container_of(gc,
578 			struct jh7110_pinctrl, gc);
579 	const struct jh7110_pinctrl_soc_info *info = sfp->info;
580 
581 	/* enable input and schmitt trigger */
582 	jh7110_padcfg_rmw(sfp, gpio,
583 			  JH7110_PADCFG_IE | JH7110_PADCFG_SMT,
584 			  JH7110_PADCFG_IE | JH7110_PADCFG_SMT);
585 
586 	if (info->jh7110_set_one_pin_mux)
587 		info->jh7110_set_one_pin_mux(sfp, gpio,
588 				GPI_NONE, GPOUT_LOW, GPOEN_DISABLE, 0);
589 
590 	return 0;
591 }
592 
jh7110_gpio_direction_output(struct gpio_chip * gc,unsigned int gpio,int value)593 static int jh7110_gpio_direction_output(struct gpio_chip *gc,
594 					unsigned int gpio, int value)
595 {
596 	struct jh7110_pinctrl *sfp = container_of(gc,
597 			struct jh7110_pinctrl, gc);
598 	const struct jh7110_pinctrl_soc_info *info = sfp->info;
599 
600 	if (info->jh7110_set_one_pin_mux)
601 		info->jh7110_set_one_pin_mux(sfp, gpio,
602 				GPI_NONE, value ? GPOUT_HIGH : GPOUT_LOW,
603 				GPOEN_ENABLE, 0);
604 
605 	/* disable input, schmitt trigger and bias */
606 	jh7110_padcfg_rmw(sfp, gpio,
607 			  JH7110_PADCFG_IE | JH7110_PADCFG_SMT |
608 			  JH7110_PADCFG_BIAS, 0);
609 	return 0;
610 }
611 
jh7110_gpio_get(struct gpio_chip * gc,unsigned int gpio)612 static int jh7110_gpio_get(struct gpio_chip *gc, unsigned int gpio)
613 {
614 	struct jh7110_pinctrl *sfp = container_of(gc,
615 			struct jh7110_pinctrl, gc);
616 	const struct jh7110_pinctrl_soc_info *info = sfp->info;
617 	void __iomem *reg = sfp->base + info->gpioin_reg_base
618 			+ 4 * (gpio / 32);
619 
620 	return !!(readl_relaxed(reg) & BIT(gpio % 32));
621 }
622 
jh7110_gpio_set(struct gpio_chip * gc,unsigned int gpio,int value)623 static void jh7110_gpio_set(struct gpio_chip *gc,
624 			    unsigned int gpio, int value)
625 {
626 	struct jh7110_pinctrl *sfp = container_of(gc,
627 			struct jh7110_pinctrl, gc);
628 	const struct jh7110_pinctrl_soc_info *info = sfp->info;
629 	unsigned int offset = 4 * (gpio / 4);
630 	unsigned int shift  = 8 * (gpio % 4);
631 	void __iomem *reg_dout = sfp->base + info->dout_reg_base + offset;
632 	u32 dout = (value ? GPOUT_HIGH : GPOUT_LOW) << shift;
633 	u32 mask = info->dout_mask << shift;
634 	unsigned long flags;
635 
636 	raw_spin_lock_irqsave(&sfp->lock, flags);
637 	dout |= readl_relaxed(reg_dout) & ~mask;
638 	writel_relaxed(dout, reg_dout);
639 	raw_spin_unlock_irqrestore(&sfp->lock, flags);
640 }
641 
jh7110_gpio_set_config(struct gpio_chip * gc,unsigned int gpio,unsigned long config)642 static int jh7110_gpio_set_config(struct gpio_chip *gc,
643 				  unsigned int gpio, unsigned long config)
644 {
645 	struct jh7110_pinctrl *sfp = container_of(gc,
646 			struct jh7110_pinctrl, gc);
647 	u32 arg = pinconf_to_config_argument(config);
648 	u32 value;
649 	u32 mask;
650 
651 	switch (pinconf_to_config_param(config)) {
652 	case PIN_CONFIG_BIAS_DISABLE:
653 		mask  = JH7110_PADCFG_BIAS;
654 		value = 0;
655 		break;
656 	case PIN_CONFIG_BIAS_PULL_DOWN:
657 		if (arg == 0)
658 			return -ENOTSUPP;
659 		mask  = JH7110_PADCFG_BIAS;
660 		value = JH7110_PADCFG_PD;
661 		break;
662 	case PIN_CONFIG_BIAS_PULL_UP:
663 		if (arg == 0)
664 			return -ENOTSUPP;
665 		mask  = JH7110_PADCFG_BIAS;
666 		value = JH7110_PADCFG_PU;
667 		break;
668 	case PIN_CONFIG_DRIVE_PUSH_PULL:
669 		return 0;
670 	case PIN_CONFIG_INPUT_ENABLE:
671 		mask  = JH7110_PADCFG_IE;
672 		value = arg ? JH7110_PADCFG_IE : 0;
673 		break;
674 	case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
675 		mask  = JH7110_PADCFG_SMT;
676 		value = arg ? JH7110_PADCFG_SMT : 0;
677 		break;
678 	default:
679 		return -ENOTSUPP;
680 	}
681 
682 	jh7110_padcfg_rmw(sfp, gpio, mask, value);
683 	return 0;
684 }
685 
jh7110_gpio_add_pin_ranges(struct gpio_chip * gc)686 static int jh7110_gpio_add_pin_ranges(struct gpio_chip *gc)
687 {
688 	struct jh7110_pinctrl *sfp = container_of(gc,
689 			struct jh7110_pinctrl, gc);
690 
691 	sfp->gpios.name = sfp->gc.label;
692 	sfp->gpios.base = sfp->gc.base;
693 	sfp->gpios.pin_base = 0;
694 	sfp->gpios.npins = sfp->gc.ngpio;
695 	sfp->gpios.gc = &sfp->gc;
696 	pinctrl_add_gpio_range(sfp->pctl, &sfp->gpios);
697 	return 0;
698 }
699 
jh7110_irq_ack(struct irq_data * d)700 static void jh7110_irq_ack(struct irq_data *d)
701 {
702 	struct jh7110_pinctrl *sfp = jh7110_from_irq_data(d);
703 	const struct jh7110_gpio_irq_reg *irq_reg = sfp->info->irq_reg;
704 	irq_hw_number_t gpio = irqd_to_hwirq(d);
705 	void __iomem *ic = sfp->base + irq_reg->ic_reg_base
706 		+ 4 * (gpio / 32);
707 	u32 mask = BIT(gpio % 32);
708 	unsigned long flags;
709 	u32 value;
710 
711 	raw_spin_lock_irqsave(&sfp->lock, flags);
712 	value = readl_relaxed(ic) & ~mask;
713 	writel_relaxed(value, ic);
714 	writel_relaxed(value | mask, ic);
715 	raw_spin_unlock_irqrestore(&sfp->lock, flags);
716 }
717 
jh7110_irq_mask(struct irq_data * d)718 static void jh7110_irq_mask(struct irq_data *d)
719 {
720 	struct jh7110_pinctrl *sfp = jh7110_from_irq_data(d);
721 	const struct jh7110_gpio_irq_reg *irq_reg = sfp->info->irq_reg;
722 	irq_hw_number_t gpio = irqd_to_hwirq(d);
723 	void __iomem *ie = sfp->base + irq_reg->ie_reg_base
724 		+ 4 * (gpio / 32);
725 	u32 mask = BIT(gpio % 32);
726 	unsigned long flags;
727 	u32 value;
728 
729 	raw_spin_lock_irqsave(&sfp->lock, flags);
730 	value = readl_relaxed(ie) & ~mask;
731 	writel_relaxed(value, ie);
732 	raw_spin_unlock_irqrestore(&sfp->lock, flags);
733 
734 	gpiochip_disable_irq(&sfp->gc, d->hwirq);
735 }
736 
jh7110_irq_mask_ack(struct irq_data * d)737 static void jh7110_irq_mask_ack(struct irq_data *d)
738 {
739 	struct jh7110_pinctrl *sfp = jh7110_from_irq_data(d);
740 	const struct jh7110_gpio_irq_reg *irq_reg = sfp->info->irq_reg;
741 	irq_hw_number_t gpio = irqd_to_hwirq(d);
742 	void __iomem *ie = sfp->base + irq_reg->ie_reg_base
743 		+ 4 * (gpio / 32);
744 	void __iomem *ic = sfp->base + irq_reg->ic_reg_base
745 		+ 4 * (gpio / 32);
746 	u32 mask = BIT(gpio % 32);
747 	unsigned long flags;
748 	u32 value;
749 
750 	raw_spin_lock_irqsave(&sfp->lock, flags);
751 	value = readl_relaxed(ie) & ~mask;
752 	writel_relaxed(value, ie);
753 
754 	value = readl_relaxed(ic) & ~mask;
755 	writel_relaxed(value, ic);
756 	writel_relaxed(value | mask, ic);
757 	raw_spin_unlock_irqrestore(&sfp->lock, flags);
758 }
759 
jh7110_irq_unmask(struct irq_data * d)760 static void jh7110_irq_unmask(struct irq_data *d)
761 {
762 	struct jh7110_pinctrl *sfp = jh7110_from_irq_data(d);
763 	const struct jh7110_gpio_irq_reg *irq_reg = sfp->info->irq_reg;
764 	irq_hw_number_t gpio = irqd_to_hwirq(d);
765 	void __iomem *ie = sfp->base + irq_reg->ie_reg_base
766 		+ 4 * (gpio / 32);
767 	u32 mask = BIT(gpio % 32);
768 	unsigned long flags;
769 	u32 value;
770 
771 	gpiochip_enable_irq(&sfp->gc, d->hwirq);
772 
773 	raw_spin_lock_irqsave(&sfp->lock, flags);
774 	value = readl_relaxed(ie) | mask;
775 	writel_relaxed(value, ie);
776 	raw_spin_unlock_irqrestore(&sfp->lock, flags);
777 }
778 
jh7110_irq_set_type(struct irq_data * d,unsigned int trigger)779 static int jh7110_irq_set_type(struct irq_data *d, unsigned int trigger)
780 {
781 	struct jh7110_pinctrl *sfp = jh7110_from_irq_data(d);
782 	const struct jh7110_gpio_irq_reg *irq_reg = sfp->info->irq_reg;
783 	irq_hw_number_t gpio = irqd_to_hwirq(d);
784 	void __iomem *base = sfp->base + 4 * (gpio / 32);
785 	u32 mask = BIT(gpio % 32);
786 	u32 irq_type, edge_both, polarity;
787 	unsigned long flags;
788 
789 	switch (trigger) {
790 	case IRQ_TYPE_EDGE_RISING:
791 		irq_type  = mask; /* 1: edge triggered */
792 		edge_both = 0;    /* 0: single edge */
793 		polarity  = mask; /* 1: rising edge */
794 		break;
795 	case IRQ_TYPE_EDGE_FALLING:
796 		irq_type  = mask; /* 1: edge triggered */
797 		edge_both = 0;    /* 0: single edge */
798 		polarity  = 0;    /* 0: falling edge */
799 		break;
800 	case IRQ_TYPE_EDGE_BOTH:
801 		irq_type  = mask; /* 1: edge triggered */
802 		edge_both = mask; /* 1: both edges */
803 		polarity  = 0;    /* 0: ignored */
804 		break;
805 	case IRQ_TYPE_LEVEL_HIGH:
806 		irq_type  = 0;    /* 0: level triggered */
807 		edge_both = 0;    /* 0: ignored */
808 		polarity  = 0;    /* 0: high level */
809 		break;
810 	case IRQ_TYPE_LEVEL_LOW:
811 		irq_type  = 0;    /* 0: level triggered */
812 		edge_both = 0;    /* 0: ignored */
813 		polarity  = mask; /* 1: low level */
814 		break;
815 	default:
816 		return -EINVAL;
817 	}
818 
819 	if (trigger & IRQ_TYPE_EDGE_BOTH)
820 		irq_set_handler_locked(d, handle_edge_irq);
821 	else
822 		irq_set_handler_locked(d, handle_level_irq);
823 
824 	raw_spin_lock_irqsave(&sfp->lock, flags);
825 	irq_type |= readl_relaxed(base + irq_reg->is_reg_base) & ~mask;
826 	writel_relaxed(irq_type, base + irq_reg->is_reg_base);
827 
828 	edge_both |= readl_relaxed(base + irq_reg->ibe_reg_base) & ~mask;
829 	writel_relaxed(edge_both, base + irq_reg->ibe_reg_base);
830 
831 	polarity |= readl_relaxed(base + irq_reg->iev_reg_base) & ~mask;
832 	writel_relaxed(polarity, base + irq_reg->iev_reg_base);
833 	raw_spin_unlock_irqrestore(&sfp->lock, flags);
834 	return 0;
835 }
836 
837 static struct irq_chip jh7110_irq_chip = {
838 	.irq_ack      = jh7110_irq_ack,
839 	.irq_mask     = jh7110_irq_mask,
840 	.irq_mask_ack = jh7110_irq_mask_ack,
841 	.irq_unmask   = jh7110_irq_unmask,
842 	.irq_set_type = jh7110_irq_set_type,
843 	.flags	      = IRQCHIP_IMMUTABLE | IRQCHIP_SET_TYPE_MASKED,
844 	GPIOCHIP_IRQ_RESOURCE_HELPERS,
845 };
846 
jh7110_disable_clock(void * data)847 static void jh7110_disable_clock(void *data)
848 {
849 	clk_disable_unprepare(data);
850 }
851 
jh7110_pinctrl_probe(struct platform_device * pdev)852 int jh7110_pinctrl_probe(struct platform_device *pdev)
853 {
854 	struct device *dev = &pdev->dev;
855 	const struct jh7110_pinctrl_soc_info *info;
856 	struct jh7110_pinctrl *sfp;
857 	struct pinctrl_desc *jh7110_pinctrl_desc;
858 	struct reset_control *rst;
859 	struct clk *clk;
860 	int ret;
861 
862 	info = of_device_get_match_data(&pdev->dev);
863 	if (!info)
864 		return -ENODEV;
865 
866 	if (!info->pins || !info->npins) {
867 		dev_err(dev, "wrong pinctrl info\n");
868 		return -EINVAL;
869 	}
870 
871 	sfp = devm_kzalloc(dev, sizeof(*sfp), GFP_KERNEL);
872 	if (!sfp)
873 		return -ENOMEM;
874 
875 #if IS_ENABLED(CONFIG_PM_SLEEP)
876 	sfp->saved_regs = devm_kcalloc(dev, info->nsaved_regs,
877 				       sizeof(*sfp->saved_regs), GFP_KERNEL);
878 	if (!sfp->saved_regs)
879 		return -ENOMEM;
880 #endif
881 
882 	sfp->base = devm_platform_ioremap_resource(pdev, 0);
883 	if (IS_ERR(sfp->base))
884 		return PTR_ERR(sfp->base);
885 
886 	clk = devm_clk_get_optional(dev, NULL);
887 	if (IS_ERR(clk))
888 		return dev_err_probe(dev, PTR_ERR(clk), "could not get clock\n");
889 
890 	rst = devm_reset_control_get_exclusive(dev, NULL);
891 	if (IS_ERR(rst))
892 		return dev_err_probe(dev, PTR_ERR(rst), "could not get reset\n");
893 
894 	/*
895 	 * we don't want to assert reset and risk undoing pin muxing for the
896 	 * early boot serial console, but let's make sure the reset line is
897 	 * deasserted in case someone runs a really minimal bootloader.
898 	 */
899 	ret = reset_control_deassert(rst);
900 	if (ret)
901 		return dev_err_probe(dev, ret, "could not deassert reset\n");
902 
903 	if (clk) {
904 		ret = clk_prepare_enable(clk);
905 		if (ret)
906 			return dev_err_probe(dev, ret, "could not enable clock\n");
907 
908 		ret = devm_add_action_or_reset(dev, jh7110_disable_clock, clk);
909 		if (ret)
910 			return ret;
911 	}
912 
913 	jh7110_pinctrl_desc = devm_kzalloc(&pdev->dev,
914 					   sizeof(*jh7110_pinctrl_desc),
915 					   GFP_KERNEL);
916 	if (!jh7110_pinctrl_desc)
917 		return -ENOMEM;
918 
919 	jh7110_pinctrl_desc->name = dev_name(dev);
920 	jh7110_pinctrl_desc->pins = info->pins;
921 	jh7110_pinctrl_desc->npins = info->npins;
922 	jh7110_pinctrl_desc->pctlops = &jh7110_pinctrl_ops;
923 	jh7110_pinctrl_desc->pmxops = &jh7110_pinmux_ops;
924 	jh7110_pinctrl_desc->confops = &jh7110_pinconf_ops;
925 	jh7110_pinctrl_desc->owner = THIS_MODULE;
926 
927 	sfp->info = info;
928 	sfp->dev = dev;
929 	platform_set_drvdata(pdev, sfp);
930 	sfp->gc.parent = dev;
931 	raw_spin_lock_init(&sfp->lock);
932 	mutex_init(&sfp->mutex);
933 
934 	ret = devm_pinctrl_register_and_init(dev,
935 					     jh7110_pinctrl_desc,
936 					     sfp, &sfp->pctl);
937 	if (ret)
938 		return dev_err_probe(dev, ret,
939 				"could not register pinctrl driver\n");
940 
941 	sfp->gc.label = dev_name(dev);
942 	sfp->gc.owner = THIS_MODULE;
943 	sfp->gc.request = jh7110_gpio_request;
944 	sfp->gc.free = jh7110_gpio_free;
945 	sfp->gc.get_direction = jh7110_gpio_get_direction;
946 	sfp->gc.direction_input = jh7110_gpio_direction_input;
947 	sfp->gc.direction_output = jh7110_gpio_direction_output;
948 	sfp->gc.get = jh7110_gpio_get;
949 	sfp->gc.set = jh7110_gpio_set;
950 	sfp->gc.set_config = jh7110_gpio_set_config;
951 	sfp->gc.add_pin_ranges = jh7110_gpio_add_pin_ranges;
952 	sfp->gc.base = info->gc_base;
953 	sfp->gc.ngpio = info->ngpios;
954 
955 	jh7110_irq_chip.name = sfp->gc.label;
956 	gpio_irq_chip_set_chip(&sfp->gc.irq, &jh7110_irq_chip);
957 	sfp->gc.irq.parent_handler = info->jh7110_gpio_irq_handler;
958 	sfp->gc.irq.num_parents = 1;
959 	sfp->gc.irq.parents = devm_kcalloc(dev, sfp->gc.irq.num_parents,
960 					   sizeof(*sfp->gc.irq.parents),
961 					   GFP_KERNEL);
962 	if (!sfp->gc.irq.parents)
963 		return -ENOMEM;
964 	sfp->gc.irq.default_type = IRQ_TYPE_NONE;
965 	sfp->gc.irq.handler = handle_bad_irq;
966 	sfp->gc.irq.init_hw = info->jh7110_gpio_init_hw;
967 
968 	ret = platform_get_irq(pdev, 0);
969 	if (ret < 0)
970 		return ret;
971 	sfp->gc.irq.parents[0] = ret;
972 
973 	ret = devm_gpiochip_add_data(dev, &sfp->gc, sfp);
974 	if (ret)
975 		return dev_err_probe(dev, ret, "could not register gpiochip\n");
976 
977 	dev_info(dev, "StarFive GPIO chip registered %d GPIOs\n", sfp->gc.ngpio);
978 
979 	return pinctrl_enable(sfp->pctl);
980 }
981 EXPORT_SYMBOL_GPL(jh7110_pinctrl_probe);
982 
jh7110_pinctrl_suspend(struct device * dev)983 static int jh7110_pinctrl_suspend(struct device *dev)
984 {
985 	struct jh7110_pinctrl *sfp = dev_get_drvdata(dev);
986 	unsigned long flags;
987 	unsigned int i;
988 
989 	raw_spin_lock_irqsave(&sfp->lock, flags);
990 	for (i = 0 ; i < sfp->info->nsaved_regs ; i++)
991 		sfp->saved_regs[i] = readl_relaxed(sfp->base + 4 * i);
992 
993 	raw_spin_unlock_irqrestore(&sfp->lock, flags);
994 	return 0;
995 }
996 
jh7110_pinctrl_resume(struct device * dev)997 static int jh7110_pinctrl_resume(struct device *dev)
998 {
999 	struct jh7110_pinctrl *sfp = dev_get_drvdata(dev);
1000 	unsigned long flags;
1001 	unsigned int i;
1002 
1003 	raw_spin_lock_irqsave(&sfp->lock, flags);
1004 	for (i = 0 ; i < sfp->info->nsaved_regs ; i++)
1005 		writel_relaxed(sfp->saved_regs[i], sfp->base + 4 * i);
1006 
1007 	raw_spin_unlock_irqrestore(&sfp->lock, flags);
1008 	return 0;
1009 }
1010 
1011 const struct dev_pm_ops jh7110_pinctrl_pm_ops = {
1012 	LATE_SYSTEM_SLEEP_PM_OPS(jh7110_pinctrl_suspend, jh7110_pinctrl_resume)
1013 };
1014 EXPORT_SYMBOL_GPL(jh7110_pinctrl_pm_ops);
1015 
1016 MODULE_DESCRIPTION("Pinctrl driver for the StarFive JH7110 SoC");
1017 MODULE_AUTHOR("Emil Renner Berthing <kernel@esmil.dk>");
1018 MODULE_AUTHOR("Jianlong Huang <jianlong.huang@starfivetech.com>");
1019 MODULE_LICENSE("GPL");
1020