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6#define LOG_CATEGORY UCLASS_PINCTRL
7
8#include <common.h>
9#include <dm.h>
10#include <hwspinlock.h>
11#include <log.h>
12#include <malloc.h>
13#include <asm/gpio.h>
14#include <asm/io.h>
15#include <dm/device_compat.h>
16#include <dm/lists.h>
17#include <dm/pinctrl.h>
18#include <linux/bitops.h>
19#include <linux/err.h>
20#include <linux/libfdt.h>
21
22#include "../gpio/stm32_gpio_priv.h"
23
24#define MAX_PINS_ONE_IP 70
25#define MODE_BITS_MASK 3
26#define OSPEED_MASK 3
27#define PUPD_MASK 3
28#define OTYPE_MSK 1
29#define AFR_MASK 0xF
30
31struct stm32_pinctrl_priv {
32 struct hwspinlock hws;
33 int pinctrl_ngpios;
34 struct list_head gpio_dev;
35};
36
37struct stm32_gpio_bank {
38 struct udevice *gpio_dev;
39 struct list_head list;
40};
41
42#ifndef CONFIG_SPL_BUILD
43
44static char pin_name[PINNAME_SIZE];
45static const char * const pinmux_mode[GPIOF_COUNT] = {
46 [GPIOF_INPUT] = "gpio input",
47 [GPIOF_OUTPUT] = "gpio output",
48 [GPIOF_UNUSED] = "analog",
49 [GPIOF_UNKNOWN] = "unknown",
50 [GPIOF_FUNC] = "alt function",
51};
52
53static const char * const pinmux_bias[] = {
54 [STM32_GPIO_PUPD_NO] = "",
55 [STM32_GPIO_PUPD_UP] = "pull-up",
56 [STM32_GPIO_PUPD_DOWN] = "pull-down",
57};
58
59static const char * const pinmux_otype[] = {
60 [STM32_GPIO_OTYPE_PP] = "push-pull",
61 [STM32_GPIO_OTYPE_OD] = "open-drain",
62};
63
64static int stm32_pinctrl_get_af(struct udevice *dev, unsigned int offset)
65{
66 struct stm32_gpio_priv *priv = dev_get_priv(dev);
67 struct stm32_gpio_regs *regs = priv->regs;
68 u32 af;
69 u32 alt_shift = (offset % 8) * 4;
70 u32 alt_index = offset / 8;
71
72 af = (readl(®s->afr[alt_index]) &
73 GENMASK(alt_shift + 3, alt_shift)) >> alt_shift;
74
75 return af;
76}
77
78static int stm32_populate_gpio_dev_list(struct udevice *dev)
79{
80 struct stm32_pinctrl_priv *priv = dev_get_priv(dev);
81 struct udevice *gpio_dev;
82 struct udevice *child;
83 struct stm32_gpio_bank *gpio_bank;
84 int ret;
85
86
87
88
89
90
91
92 list_for_each_entry(child, &dev->child_head, sibling_node) {
93 ret = uclass_get_device_by_name(UCLASS_GPIO, child->name,
94 &gpio_dev);
95 if (ret < 0)
96 continue;
97
98 gpio_bank = malloc(sizeof(*gpio_bank));
99 if (!gpio_bank) {
100 dev_err(dev, "Not enough memory\n");
101 return -ENOMEM;
102 }
103
104 gpio_bank->gpio_dev = gpio_dev;
105 list_add_tail(&gpio_bank->list, &priv->gpio_dev);
106 }
107
108 return 0;
109}
110
111static int stm32_pinctrl_get_pins_count(struct udevice *dev)
112{
113 struct stm32_pinctrl_priv *priv = dev_get_priv(dev);
114 struct gpio_dev_priv *uc_priv;
115 struct stm32_gpio_bank *gpio_bank;
116
117
118
119
120
121 if (priv->pinctrl_ngpios)
122 return priv->pinctrl_ngpios;
123
124 if (list_empty(&priv->gpio_dev))
125 stm32_populate_gpio_dev_list(dev);
126
127
128
129
130 list_for_each_entry(gpio_bank, &priv->gpio_dev, list) {
131 uc_priv = dev_get_uclass_priv(gpio_bank->gpio_dev);
132
133 priv->pinctrl_ngpios += uc_priv->gpio_count;
134 }
135
136 return priv->pinctrl_ngpios;
137}
138
139static struct udevice *stm32_pinctrl_get_gpio_dev(struct udevice *dev,
140 unsigned int selector,
141 unsigned int *idx)
142{
143 struct stm32_pinctrl_priv *priv = dev_get_priv(dev);
144 struct stm32_gpio_bank *gpio_bank;
145 struct gpio_dev_priv *uc_priv;
146 int pin_count = 0;
147
148 if (list_empty(&priv->gpio_dev))
149 stm32_populate_gpio_dev_list(dev);
150
151
152 list_for_each_entry(gpio_bank, &priv->gpio_dev, list) {
153 uc_priv = dev_get_uclass_priv(gpio_bank->gpio_dev);
154
155 if (selector < (pin_count + uc_priv->gpio_count)) {
156
157
158
159
160 *idx = selector - pin_count;
161
162 return gpio_bank->gpio_dev;
163 }
164 pin_count += uc_priv->gpio_count;
165 }
166
167 return NULL;
168}
169
170static const char *stm32_pinctrl_get_pin_name(struct udevice *dev,
171 unsigned int selector)
172{
173 struct gpio_dev_priv *uc_priv;
174 struct udevice *gpio_dev;
175 unsigned int gpio_idx;
176
177
178 gpio_dev = stm32_pinctrl_get_gpio_dev(dev, selector, &gpio_idx);
179 if (!gpio_dev) {
180 snprintf(pin_name, PINNAME_SIZE, "Error");
181 } else {
182 uc_priv = dev_get_uclass_priv(gpio_dev);
183
184 snprintf(pin_name, PINNAME_SIZE, "%s%d",
185 uc_priv->bank_name,
186 gpio_idx);
187 }
188
189 return pin_name;
190}
191
192static int stm32_pinctrl_get_pin_muxing(struct udevice *dev,
193 unsigned int selector,
194 char *buf,
195 int size)
196{
197 struct udevice *gpio_dev;
198 struct stm32_gpio_priv *priv;
199 const char *label;
200 int mode;
201 int af_num;
202 unsigned int gpio_idx;
203 u32 pupd, otype;
204
205
206 gpio_dev = stm32_pinctrl_get_gpio_dev(dev, selector, &gpio_idx);
207
208 if (!gpio_dev)
209 return -ENODEV;
210
211 mode = gpio_get_raw_function(gpio_dev, gpio_idx, &label);
212 dev_dbg(dev, "selector = %d gpio_idx = %d mode = %d\n",
213 selector, gpio_idx, mode);
214 priv = dev_get_priv(gpio_dev);
215 pupd = (readl(&priv->regs->pupdr) >> (gpio_idx * 2)) & PUPD_MASK;
216 otype = (readl(&priv->regs->otyper) >> gpio_idx) & OTYPE_MSK;
217
218 switch (mode) {
219 case GPIOF_UNKNOWN:
220 case GPIOF_UNUSED:
221 snprintf(buf, size, "%s", pinmux_mode[mode]);
222 break;
223 case GPIOF_FUNC:
224 af_num = stm32_pinctrl_get_af(gpio_dev, gpio_idx);
225 snprintf(buf, size, "%s %d %s %s", pinmux_mode[mode], af_num,
226 pinmux_otype[otype], pinmux_bias[pupd]);
227 break;
228 case GPIOF_OUTPUT:
229 snprintf(buf, size, "%s %s %s %s",
230 pinmux_mode[mode], pinmux_otype[otype],
231 pinmux_bias[pupd], label ? label : "");
232 break;
233 case GPIOF_INPUT:
234 snprintf(buf, size, "%s %s %s", pinmux_mode[mode],
235 pinmux_bias[pupd], label ? label : "");
236 break;
237 }
238
239 return 0;
240}
241
242#endif
243
244static int stm32_pinctrl_probe(struct udevice *dev)
245{
246 struct stm32_pinctrl_priv *priv = dev_get_priv(dev);
247 int ret;
248
249 INIT_LIST_HEAD(&priv->gpio_dev);
250
251
252 ret = hwspinlock_get_by_index(dev, 0, &priv->hws);
253 if (ret)
254 dev_dbg(dev, "hwspinlock_get_by_index may have failed (%d)\n",
255 ret);
256
257 return 0;
258}
259
260static int stm32_gpio_config(struct gpio_desc *desc,
261 const struct stm32_gpio_ctl *ctl)
262{
263 struct stm32_gpio_priv *priv = dev_get_priv(desc->dev);
264 struct stm32_gpio_regs *regs = priv->regs;
265 struct stm32_pinctrl_priv *ctrl_priv;
266 int ret;
267 u32 index;
268
269 if (!ctl || ctl->af > 15 || ctl->mode > 3 || ctl->otype > 1 ||
270 ctl->pupd > 2 || ctl->speed > 3)
271 return -EINVAL;
272
273 ctrl_priv = dev_get_priv(dev_get_parent(desc->dev));
274 ret = hwspinlock_lock_timeout(&ctrl_priv->hws, 10);
275 if (ret == -ETIME) {
276 dev_err(desc->dev, "HWSpinlock timeout\n");
277 return ret;
278 }
279
280 index = (desc->offset & 0x07) * 4;
281 clrsetbits_le32(®s->afr[desc->offset >> 3], AFR_MASK << index,
282 ctl->af << index);
283
284 index = desc->offset * 2;
285 clrsetbits_le32(®s->moder, MODE_BITS_MASK << index,
286 ctl->mode << index);
287 clrsetbits_le32(®s->ospeedr, OSPEED_MASK << index,
288 ctl->speed << index);
289 clrsetbits_le32(®s->pupdr, PUPD_MASK << index, ctl->pupd << index);
290
291 index = desc->offset;
292 clrsetbits_le32(®s->otyper, OTYPE_MSK << index, ctl->otype << index);
293
294 hwspinlock_unlock(&ctrl_priv->hws);
295
296 return 0;
297}
298
299static int prep_gpio_dsc(struct stm32_gpio_dsc *gpio_dsc, u32 port_pin)
300{
301 gpio_dsc->port = (port_pin & 0x1F000) >> 12;
302 gpio_dsc->pin = (port_pin & 0x0F00) >> 8;
303 log_debug("GPIO:port= %d, pin= %d\n", gpio_dsc->port, gpio_dsc->pin);
304
305 return 0;
306}
307
308static int prep_gpio_ctl(struct stm32_gpio_ctl *gpio_ctl, u32 gpio_fn,
309 ofnode node)
310{
311 gpio_fn &= 0x00FF;
312 gpio_ctl->af = 0;
313
314 switch (gpio_fn) {
315 case 0:
316 gpio_ctl->mode = STM32_GPIO_MODE_IN;
317 break;
318 case 1 ... 16:
319 gpio_ctl->mode = STM32_GPIO_MODE_AF;
320 gpio_ctl->af = gpio_fn - 1;
321 break;
322 case 17:
323 gpio_ctl->mode = STM32_GPIO_MODE_AN;
324 break;
325 default:
326 gpio_ctl->mode = STM32_GPIO_MODE_OUT;
327 break;
328 }
329
330 gpio_ctl->speed = ofnode_read_u32_default(node, "slew-rate", 0);
331
332 if (ofnode_read_bool(node, "drive-open-drain"))
333 gpio_ctl->otype = STM32_GPIO_OTYPE_OD;
334 else
335 gpio_ctl->otype = STM32_GPIO_OTYPE_PP;
336
337 if (ofnode_read_bool(node, "bias-pull-up"))
338 gpio_ctl->pupd = STM32_GPIO_PUPD_UP;
339 else if (ofnode_read_bool(node, "bias-pull-down"))
340 gpio_ctl->pupd = STM32_GPIO_PUPD_DOWN;
341 else
342 gpio_ctl->pupd = STM32_GPIO_PUPD_NO;
343
344 log_debug("gpio fn= %d, slew-rate= %x, op type= %x, pull-upd is = %x\n",
345 gpio_fn, gpio_ctl->speed, gpio_ctl->otype,
346 gpio_ctl->pupd);
347
348 return 0;
349}
350
351static int stm32_pinctrl_config(ofnode node)
352{
353 u32 pin_mux[MAX_PINS_ONE_IP];
354 int rv, len;
355 ofnode subnode;
356
357
358
359
360
361 ofnode_for_each_subnode(subnode, node) {
362 struct stm32_gpio_dsc gpio_dsc;
363 struct stm32_gpio_ctl gpio_ctl;
364 int i;
365
366 rv = ofnode_read_size(subnode, "pinmux");
367 if (rv < 0)
368 return rv;
369 len = rv / sizeof(pin_mux[0]);
370 log_debug("No of pinmux entries= %d\n", len);
371 if (len > MAX_PINS_ONE_IP)
372 return -EINVAL;
373 rv = ofnode_read_u32_array(subnode, "pinmux", pin_mux, len);
374 if (rv < 0)
375 return rv;
376 for (i = 0; i < len; i++) {
377 struct gpio_desc desc;
378
379 log_debug("pinmux = %x\n", *(pin_mux + i));
380 prep_gpio_dsc(&gpio_dsc, *(pin_mux + i));
381 prep_gpio_ctl(&gpio_ctl, *(pin_mux + i), subnode);
382 rv = uclass_get_device_by_seq(UCLASS_GPIO,
383 gpio_dsc.port,
384 &desc.dev);
385 if (rv)
386 return rv;
387 desc.offset = gpio_dsc.pin;
388 rv = stm32_gpio_config(&desc, &gpio_ctl);
389 log_debug("rv = %d\n\n", rv);
390 if (rv)
391 return rv;
392 }
393 }
394
395 return 0;
396}
397
398static int stm32_pinctrl_bind(struct udevice *dev)
399{
400 ofnode node;
401 const char *name;
402 int ret;
403
404 dev_for_each_subnode(node, dev) {
405 dev_dbg(dev, "bind %s\n", ofnode_get_name(node));
406
407 if (!ofnode_is_enabled(node))
408 continue;
409
410 ofnode_get_property(node, "gpio-controller", &ret);
411 if (ret < 0)
412 continue;
413
414 name = ofnode_get_name(node);
415 if (!name)
416 return -EINVAL;
417
418
419 ret = device_bind_driver_to_node(dev, "gpio_stm32",
420 name, node, NULL);
421 if (ret)
422 return ret;
423
424 dev_dbg(dev, "bind %s\n", name);
425 }
426
427 return 0;
428}
429
430#if CONFIG_IS_ENABLED(PINCTRL_FULL)
431static int stm32_pinctrl_set_state(struct udevice *dev, struct udevice *config)
432{
433 return stm32_pinctrl_config(dev_ofnode(config));
434}
435#else
436static int stm32_pinctrl_set_state_simple(struct udevice *dev,
437 struct udevice *periph)
438{
439 const fdt32_t *list;
440 uint32_t phandle;
441 ofnode config_node;
442 int size, i, ret;
443
444 list = ofnode_get_property(dev_ofnode(periph), "pinctrl-0", &size);
445 if (!list)
446 return -EINVAL;
447
448 dev_dbg(dev, "periph->name = %s\n", periph->name);
449
450 size /= sizeof(*list);
451 for (i = 0; i < size; i++) {
452 phandle = fdt32_to_cpu(*list++);
453
454 config_node = ofnode_get_by_phandle(phandle);
455 if (!ofnode_valid(config_node)) {
456 dev_err(periph,
457 "prop pinctrl-0 index %d invalid phandle\n", i);
458 return -EINVAL;
459 }
460
461 ret = stm32_pinctrl_config(config_node);
462 if (ret)
463 return ret;
464 }
465
466 return 0;
467}
468#endif
469
470static struct pinctrl_ops stm32_pinctrl_ops = {
471#if CONFIG_IS_ENABLED(PINCTRL_FULL)
472 .set_state = stm32_pinctrl_set_state,
473#else
474 .set_state_simple = stm32_pinctrl_set_state_simple,
475#endif
476#ifndef CONFIG_SPL_BUILD
477 .get_pin_name = stm32_pinctrl_get_pin_name,
478 .get_pins_count = stm32_pinctrl_get_pins_count,
479 .get_pin_muxing = stm32_pinctrl_get_pin_muxing,
480#endif
481};
482
483static const struct udevice_id stm32_pinctrl_ids[] = {
484 { .compatible = "st,stm32f429-pinctrl" },
485 { .compatible = "st,stm32f469-pinctrl" },
486 { .compatible = "st,stm32f746-pinctrl" },
487 { .compatible = "st,stm32f769-pinctrl" },
488 { .compatible = "st,stm32h743-pinctrl" },
489 { .compatible = "st,stm32mp157-pinctrl" },
490 { .compatible = "st,stm32mp157-z-pinctrl" },
491 { }
492};
493
494U_BOOT_DRIVER(pinctrl_stm32) = {
495 .name = "pinctrl_stm32",
496 .id = UCLASS_PINCTRL,
497 .of_match = stm32_pinctrl_ids,
498 .ops = &stm32_pinctrl_ops,
499 .bind = stm32_pinctrl_bind,
500 .probe = stm32_pinctrl_probe,
501 .priv_auto = sizeof(struct stm32_pinctrl_priv),
502};
503