1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Copyright (C) 2016 IBM Corp.
6 #include <linux/mfd/syscon.h>
7 #include <linux/platform_device.h>
8 #include <linux/slab.h>
9 #include <linux/string.h>
11 #include "pinctrl-aspeed.h"
13 int aspeed_pinctrl_get_groups_count(struct pinctrl_dev *pctldev)
15 struct aspeed_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
17 return pdata->pinmux.ngroups;
20 const char *aspeed_pinctrl_get_group_name(struct pinctrl_dev *pctldev,
23 struct aspeed_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
25 return pdata->pinmux.groups[group].name;
28 int aspeed_pinctrl_get_group_pins(struct pinctrl_dev *pctldev,
29 unsigned int group, const unsigned int **pins,
32 struct aspeed_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
34 *pins = &pdata->pinmux.groups[group].pins[0];
35 *npins = pdata->pinmux.groups[group].npins;
40 void aspeed_pinctrl_pin_dbg_show(struct pinctrl_dev *pctldev,
41 struct seq_file *s, unsigned int offset)
43 seq_printf(s, " %s", dev_name(pctldev->dev));
46 int aspeed_pinmux_get_fn_count(struct pinctrl_dev *pctldev)
48 struct aspeed_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
50 return pdata->pinmux.nfunctions;
53 const char *aspeed_pinmux_get_fn_name(struct pinctrl_dev *pctldev,
54 unsigned int function)
56 struct aspeed_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
58 return pdata->pinmux.functions[function].name;
61 int aspeed_pinmux_get_fn_groups(struct pinctrl_dev *pctldev,
62 unsigned int function,
63 const char * const **groups,
64 unsigned int * const num_groups)
66 struct aspeed_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
68 *groups = pdata->pinmux.functions[function].groups;
69 *num_groups = pdata->pinmux.functions[function].ngroups;
74 static int aspeed_sig_expr_enable(struct aspeed_pinmux_data *ctx,
75 const struct aspeed_sig_expr *expr)
79 pr_debug("Enabling signal %s for %s\n", expr->signal,
82 ret = aspeed_sig_expr_eval(ctx, expr, true);
87 return aspeed_sig_expr_set(ctx, expr, true);
92 static int aspeed_sig_expr_disable(struct aspeed_pinmux_data *ctx,
93 const struct aspeed_sig_expr *expr)
97 pr_debug("Disabling signal %s for %s\n", expr->signal,
100 ret = aspeed_sig_expr_eval(ctx, expr, true);
105 return aspeed_sig_expr_set(ctx, expr, false);
111 * Disable a signal on a pin by disabling all provided signal expressions.
113 * @ctx: The pinmux context
114 * @exprs: The list of signal expressions (from a priority level on a pin)
116 * Return: 0 if all expressions are disabled, otherwise a negative error code
118 static int aspeed_disable_sig(struct aspeed_pinmux_data *ctx,
119 const struct aspeed_sig_expr **exprs)
126 while (*exprs && !ret) {
127 ret = aspeed_sig_expr_disable(ctx, *exprs);
135 * Search for the signal expression needed to enable the pin's signal for the
136 * requested function.
138 * @exprs: List of signal expressions (haystack)
139 * @name: The name of the requested function (needle)
141 * Return: A pointer to the signal expression whose function tag matches the
142 * provided name, otherwise NULL.
145 static const struct aspeed_sig_expr *aspeed_find_expr_by_name(
146 const struct aspeed_sig_expr **exprs, const char *name)
149 if (strcmp((*exprs)->function, name) == 0)
157 static char *get_defined_attribute(const struct aspeed_pin_desc *pdesc,
159 const struct aspeed_sig_expr *))
163 const struct aspeed_sig_expr ***prios, **funcs, *expr;
165 prios = pdesc->prios;
167 while ((funcs = *prios)) {
168 while ((expr = *funcs)) {
169 const char *str = get(expr);
170 size_t delta = strlen(str) + 2;
173 expanded = krealloc(found, len + delta + 1, GFP_KERNEL);
196 found[len - 2] = '\0';
201 static const char *aspeed_sig_expr_function(const struct aspeed_sig_expr *expr)
203 return expr->function;
206 static char *get_defined_functions(const struct aspeed_pin_desc *pdesc)
208 return get_defined_attribute(pdesc, aspeed_sig_expr_function);
211 static const char *aspeed_sig_expr_signal(const struct aspeed_sig_expr *expr)
216 static char *get_defined_signals(const struct aspeed_pin_desc *pdesc)
218 return get_defined_attribute(pdesc, aspeed_sig_expr_signal);
221 int aspeed_pinmux_set_mux(struct pinctrl_dev *pctldev, unsigned int function,
226 struct aspeed_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
227 const struct aspeed_pin_group *pgroup = &pdata->pinmux.groups[group];
228 const struct aspeed_pin_function *pfunc =
229 &pdata->pinmux.functions[function];
231 for (i = 0; i < pgroup->npins; i++) {
232 int pin = pgroup->pins[i];
233 const struct aspeed_pin_desc *pdesc = pdata->pins[pin].drv_data;
234 const struct aspeed_sig_expr *expr = NULL;
235 const struct aspeed_sig_expr **funcs;
236 const struct aspeed_sig_expr ***prios;
238 pr_debug("Muxing pin %s for %s\n", pdesc->name, pfunc->name);
243 prios = pdesc->prios;
248 /* Disable functions at a higher priority than that requested */
249 while ((funcs = *prios)) {
250 expr = aspeed_find_expr_by_name(funcs, pfunc->name);
255 ret = aspeed_disable_sig(&pdata->pinmux, funcs);
263 char *functions = get_defined_functions(pdesc);
264 char *signals = get_defined_signals(pdesc);
266 pr_warn("No function %s found on pin %s (%d). Found signal(s) %s for function(s) %s\n",
267 pfunc->name, pdesc->name, pin, signals,
275 ret = aspeed_sig_expr_enable(&pdata->pinmux, expr);
279 pr_debug("Muxed pin %s as %s for %s\n", pdesc->name, expr->signal,
286 static bool aspeed_expr_is_gpio(const struct aspeed_sig_expr *expr)
289 * The signal type is GPIO if the signal name has "GPIO" as a prefix.
290 * strncmp (rather than strcmp) is used to implement the prefix
293 * expr->signal might look like "GPIOT3" in the GPIO case.
295 return strncmp(expr->signal, "GPIO", 4) == 0;
298 static bool aspeed_gpio_in_exprs(const struct aspeed_sig_expr **exprs)
304 if (aspeed_expr_is_gpio(*exprs))
312 int aspeed_gpio_request_enable(struct pinctrl_dev *pctldev,
313 struct pinctrl_gpio_range *range,
317 struct aspeed_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
318 const struct aspeed_pin_desc *pdesc = pdata->pins[offset].drv_data;
319 const struct aspeed_sig_expr ***prios, **funcs, *expr;
324 prios = pdesc->prios;
329 pr_debug("Muxing pin %s for GPIO\n", pdesc->name);
331 /* Disable any functions of higher priority than GPIO */
332 while ((funcs = *prios)) {
333 if (aspeed_gpio_in_exprs(funcs))
336 ret = aspeed_disable_sig(&pdata->pinmux, funcs);
344 char *signals = get_defined_signals(pdesc);
346 pr_warn("No GPIO signal type found on pin %s (%d). Found: %s\n",
347 pdesc->name, offset, signals);
356 * Disabling all higher-priority expressions is enough to enable the
357 * lowest-priority signal type. As such it has no associated
361 pr_debug("Muxed pin %s as GPIO\n", pdesc->name);
366 * If GPIO is not the lowest priority signal type, assume there is only
367 * one expression defined to enable the GPIO function
369 ret = aspeed_sig_expr_enable(&pdata->pinmux, expr);
373 pr_debug("Muxed pin %s as %s\n", pdesc->name, expr->signal);
378 int aspeed_pinctrl_probe(struct platform_device *pdev,
379 struct pinctrl_desc *pdesc,
380 struct aspeed_pinctrl_data *pdata)
382 struct device *parent;
383 struct pinctrl_dev *pctl;
385 parent = pdev->dev.parent;
387 dev_err(&pdev->dev, "No parent for syscon pincontroller\n");
391 pdata->scu = syscon_node_to_regmap(parent->of_node);
392 if (IS_ERR(pdata->scu)) {
393 dev_err(&pdev->dev, "No regmap for syscon pincontroller parent\n");
394 return PTR_ERR(pdata->scu);
397 pdata->pinmux.maps[ASPEED_IP_SCU] = pdata->scu;
399 pctl = pinctrl_register(pdesc, &pdev->dev, pdata);
402 dev_err(&pdev->dev, "Failed to register pinctrl\n");
403 return PTR_ERR(pctl);
406 platform_set_drvdata(pdev, pdata);
411 static inline bool pin_in_config_range(unsigned int offset,
412 const struct aspeed_pin_config *config)
414 return offset >= config->pins[0] && offset <= config->pins[1];
417 static inline const struct aspeed_pin_config *find_pinconf_config(
418 const struct aspeed_pinctrl_data *pdata,
420 enum pin_config_param param)
424 for (i = 0; i < pdata->nconfigs; i++) {
425 if (param == pdata->configs[i].param &&
426 pin_in_config_range(offset, &pdata->configs[i]))
427 return &pdata->configs[i];
433 enum aspeed_pin_config_map_type { MAP_TYPE_ARG, MAP_TYPE_VAL };
435 static const struct aspeed_pin_config_map *find_pinconf_map(
436 const struct aspeed_pinctrl_data *pdata,
437 enum pin_config_param param,
438 enum aspeed_pin_config_map_type type,
443 for (i = 0; i < pdata->nconfmaps; i++) {
444 const struct aspeed_pin_config_map *elem;
447 elem = &pdata->confmaps[i];
451 match = (elem->arg == -1 || elem->arg == value);
454 match = (elem->val == value);
458 if (param == elem->param && match)
465 int aspeed_pin_config_get(struct pinctrl_dev *pctldev, unsigned int offset,
466 unsigned long *config)
468 const enum pin_config_param param = pinconf_to_config_param(*config);
469 const struct aspeed_pin_config_map *pmap;
470 const struct aspeed_pinctrl_data *pdata;
471 const struct aspeed_pin_config *pconf;
476 pdata = pinctrl_dev_get_drvdata(pctldev);
477 pconf = find_pinconf_config(pdata, offset, param);
481 rc = regmap_read(pdata->scu, pconf->reg, &val);
485 pmap = find_pinconf_map(pdata, param, MAP_TYPE_VAL,
486 (val & pconf->mask) >> __ffs(pconf->mask));
491 if (param == PIN_CONFIG_DRIVE_STRENGTH)
492 arg = (u32) pmap->arg;
493 else if (param == PIN_CONFIG_BIAS_PULL_DOWN)
501 *config = pinconf_to_config_packed(param, arg);
506 int aspeed_pin_config_set(struct pinctrl_dev *pctldev, unsigned int offset,
507 unsigned long *configs, unsigned int num_configs)
509 const struct aspeed_pinctrl_data *pdata;
513 pdata = pinctrl_dev_get_drvdata(pctldev);
515 for (i = 0; i < num_configs; i++) {
516 const struct aspeed_pin_config_map *pmap;
517 const struct aspeed_pin_config *pconf;
518 enum pin_config_param param;
522 param = pinconf_to_config_param(configs[i]);
523 arg = pinconf_to_config_argument(configs[i]);
525 pconf = find_pinconf_config(pdata, offset, param);
529 pmap = find_pinconf_map(pdata, param, MAP_TYPE_ARG, arg);
534 val = pmap->val << __ffs(pconf->mask);
536 rc = regmap_update_bits(pdata->scu, pconf->reg,
542 pr_debug("%s: Set SCU%02X[0x%08X]=0x%X for param %d(=%d) on pin %d\n",
543 __func__, pconf->reg, pconf->mask,
544 val, param, arg, offset);
550 int aspeed_pin_config_group_get(struct pinctrl_dev *pctldev,
551 unsigned int selector,
552 unsigned long *config)
554 const unsigned int *pins;
558 rc = aspeed_pinctrl_get_group_pins(pctldev, selector, &pins, &npins);
565 rc = aspeed_pin_config_get(pctldev, pins[0], config);
570 int aspeed_pin_config_group_set(struct pinctrl_dev *pctldev,
571 unsigned int selector,
572 unsigned long *configs,
573 unsigned int num_configs)
575 const unsigned int *pins;
580 pr_debug("%s: Fetching pins for group selector %d\n",
582 rc = aspeed_pinctrl_get_group_pins(pctldev, selector, &pins, &npins);
586 for (i = 0; i < npins; i++) {
587 rc = aspeed_pin_config_set(pctldev, pins[i], configs,