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415 lines
12 KiB
415 lines
12 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Core driver for the generic pin config portions of the pin control subsystem |
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* |
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* Copyright (C) 2011 ST-Ericsson SA |
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* Written on behalf of Linaro for ST-Ericsson |
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* |
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* Author: Linus Walleij <[email protected]> |
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*/ |
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#define pr_fmt(fmt) "generic pinconfig core: " fmt |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/init.h> |
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#include <linux/device.h> |
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#include <linux/slab.h> |
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#include <linux/debugfs.h> |
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#include <linux/seq_file.h> |
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#include <linux/pinctrl/pinctrl.h> |
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#include <linux/pinctrl/pinconf.h> |
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#include <linux/pinctrl/pinconf-generic.h> |
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#include <linux/of.h> |
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#include "core.h" |
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#include "pinconf.h" |
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#include "pinctrl-utils.h" |
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#ifdef CONFIG_DEBUG_FS |
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static const struct pin_config_item conf_items[] = { |
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PCONFDUMP(PIN_CONFIG_BIAS_BUS_HOLD, "input bias bus hold", NULL, false), |
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PCONFDUMP(PIN_CONFIG_BIAS_DISABLE, "input bias disabled", NULL, false), |
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PCONFDUMP(PIN_CONFIG_BIAS_HIGH_IMPEDANCE, "input bias high impedance", NULL, false), |
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PCONFDUMP(PIN_CONFIG_BIAS_PULL_DOWN, "input bias pull down", NULL, false), |
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PCONFDUMP(PIN_CONFIG_BIAS_PULL_PIN_DEFAULT, |
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"input bias pull to pin specific state", NULL, false), |
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PCONFDUMP(PIN_CONFIG_BIAS_PULL_UP, "input bias pull up", NULL, false), |
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PCONFDUMP(PIN_CONFIG_DRIVE_OPEN_DRAIN, "output drive open drain", NULL, false), |
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PCONFDUMP(PIN_CONFIG_DRIVE_OPEN_SOURCE, "output drive open source", NULL, false), |
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PCONFDUMP(PIN_CONFIG_DRIVE_PUSH_PULL, "output drive push pull", NULL, false), |
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PCONFDUMP(PIN_CONFIG_DRIVE_STRENGTH, "output drive strength", "mA", true), |
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PCONFDUMP(PIN_CONFIG_DRIVE_STRENGTH_UA, "output drive strength", "uA", true), |
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PCONFDUMP(PIN_CONFIG_INPUT_DEBOUNCE, "input debounce", "usec", true), |
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PCONFDUMP(PIN_CONFIG_INPUT_ENABLE, "input enabled", NULL, false), |
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PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT, "input schmitt trigger", NULL, false), |
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PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT_ENABLE, "input schmitt enabled", NULL, false), |
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PCONFDUMP(PIN_CONFIG_LOW_POWER_MODE, "pin low power", "mode", true), |
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PCONFDUMP(PIN_CONFIG_OUTPUT_ENABLE, "output enabled", NULL, false), |
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PCONFDUMP(PIN_CONFIG_OUTPUT, "pin output", "level", true), |
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PCONFDUMP(PIN_CONFIG_POWER_SOURCE, "pin power source", "selector", true), |
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PCONFDUMP(PIN_CONFIG_SLEEP_HARDWARE_STATE, "sleep hardware state", NULL, false), |
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PCONFDUMP(PIN_CONFIG_SLEW_RATE, "slew rate", NULL, true), |
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PCONFDUMP(PIN_CONFIG_SKEW_DELAY, "skew delay", NULL, true), |
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}; |
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static void pinconf_generic_dump_one(struct pinctrl_dev *pctldev, |
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struct seq_file *s, const char *gname, |
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unsigned pin, |
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const struct pin_config_item *items, |
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int nitems, int *print_sep) |
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{ |
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int i; |
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for (i = 0; i < nitems; i++) { |
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unsigned long config; |
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int ret; |
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/* We want to check out this parameter */ |
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config = pinconf_to_config_packed(items[i].param, 0); |
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if (gname) |
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ret = pin_config_group_get(dev_name(pctldev->dev), |
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gname, &config); |
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else |
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ret = pin_config_get_for_pin(pctldev, pin, &config); |
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/* These are legal errors */ |
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if (ret == -EINVAL || ret == -ENOTSUPP) |
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continue; |
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if (ret) { |
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seq_printf(s, "ERROR READING CONFIG SETTING %d ", i); |
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continue; |
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} |
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/* comma between multiple configs */ |
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if (*print_sep) |
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seq_puts(s, ", "); |
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*print_sep = 1; |
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seq_puts(s, items[i].display); |
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/* Print unit if available */ |
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if (items[i].has_arg) { |
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seq_printf(s, " (%u", |
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pinconf_to_config_argument(config)); |
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if (items[i].format) |
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seq_printf(s, " %s)", items[i].format); |
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else |
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seq_puts(s, ")"); |
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} |
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} |
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} |
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/** |
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* pinconf_generic_dump_pins - Print information about pin or group of pins |
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* @pctldev: Pincontrol device |
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* @s: File to print to |
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* @gname: Group name specifying pins |
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* @pin: Pin number specyfying pin |
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* |
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* Print the pinconf configuration for the requested pin(s) to @s. Pins can be |
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* specified either by pin using @pin or by group using @gname. Only one needs |
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* to be specified the other can be NULL/0. |
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*/ |
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void pinconf_generic_dump_pins(struct pinctrl_dev *pctldev, struct seq_file *s, |
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const char *gname, unsigned pin) |
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{ |
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const struct pinconf_ops *ops = pctldev->desc->confops; |
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int print_sep = 0; |
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if (!ops->is_generic) |
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return; |
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/* generic parameters */ |
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pinconf_generic_dump_one(pctldev, s, gname, pin, conf_items, |
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ARRAY_SIZE(conf_items), &print_sep); |
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/* driver-specific parameters */ |
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if (pctldev->desc->num_custom_params && |
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pctldev->desc->custom_conf_items) |
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pinconf_generic_dump_one(pctldev, s, gname, pin, |
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pctldev->desc->custom_conf_items, |
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pctldev->desc->num_custom_params, |
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&print_sep); |
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} |
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void pinconf_generic_dump_config(struct pinctrl_dev *pctldev, |
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struct seq_file *s, unsigned long config) |
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{ |
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int i; |
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for (i = 0; i < ARRAY_SIZE(conf_items); i++) { |
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if (pinconf_to_config_param(config) != conf_items[i].param) |
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continue; |
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seq_printf(s, "%s: 0x%x", conf_items[i].display, |
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pinconf_to_config_argument(config)); |
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} |
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if (!pctldev->desc->num_custom_params || |
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!pctldev->desc->custom_conf_items) |
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return; |
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for (i = 0; i < pctldev->desc->num_custom_params; i++) { |
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if (pinconf_to_config_param(config) != |
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pctldev->desc->custom_conf_items[i].param) |
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continue; |
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seq_printf(s, "%s: 0x%x", |
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pctldev->desc->custom_conf_items[i].display, |
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pinconf_to_config_argument(config)); |
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} |
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} |
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EXPORT_SYMBOL_GPL(pinconf_generic_dump_config); |
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#endif |
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#ifdef CONFIG_OF |
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static const struct pinconf_generic_params dt_params[] = { |
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{ "bias-bus-hold", PIN_CONFIG_BIAS_BUS_HOLD, 0 }, |
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{ "bias-disable", PIN_CONFIG_BIAS_DISABLE, 0 }, |
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{ "bias-high-impedance", PIN_CONFIG_BIAS_HIGH_IMPEDANCE, 0 }, |
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{ "bias-pull-up", PIN_CONFIG_BIAS_PULL_UP, 1 }, |
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{ "bias-pull-pin-default", PIN_CONFIG_BIAS_PULL_PIN_DEFAULT, 1 }, |
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{ "bias-pull-down", PIN_CONFIG_BIAS_PULL_DOWN, 1 }, |
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{ "drive-open-drain", PIN_CONFIG_DRIVE_OPEN_DRAIN, 0 }, |
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{ "drive-open-source", PIN_CONFIG_DRIVE_OPEN_SOURCE, 0 }, |
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{ "drive-push-pull", PIN_CONFIG_DRIVE_PUSH_PULL, 0 }, |
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{ "drive-strength", PIN_CONFIG_DRIVE_STRENGTH, 0 }, |
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{ "drive-strength-microamp", PIN_CONFIG_DRIVE_STRENGTH_UA, 0 }, |
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{ "input-debounce", PIN_CONFIG_INPUT_DEBOUNCE, 0 }, |
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{ "input-disable", PIN_CONFIG_INPUT_ENABLE, 0 }, |
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{ "input-enable", PIN_CONFIG_INPUT_ENABLE, 1 }, |
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{ "input-schmitt", PIN_CONFIG_INPUT_SCHMITT, 0 }, |
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{ "input-schmitt-disable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 0 }, |
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{ "input-schmitt-enable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 1 }, |
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{ "low-power-disable", PIN_CONFIG_LOW_POWER_MODE, 0 }, |
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{ "low-power-enable", PIN_CONFIG_LOW_POWER_MODE, 1 }, |
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{ "output-disable", PIN_CONFIG_OUTPUT_ENABLE, 0 }, |
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{ "output-enable", PIN_CONFIG_OUTPUT_ENABLE, 1 }, |
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{ "output-high", PIN_CONFIG_OUTPUT, 1, }, |
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{ "output-low", PIN_CONFIG_OUTPUT, 0, }, |
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{ "power-source", PIN_CONFIG_POWER_SOURCE, 0 }, |
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{ "sleep-hardware-state", PIN_CONFIG_SLEEP_HARDWARE_STATE, 0 }, |
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{ "slew-rate", PIN_CONFIG_SLEW_RATE, 0 }, |
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{ "skew-delay", PIN_CONFIG_SKEW_DELAY, 0 }, |
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}; |
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/** |
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* parse_dt_cfg() - Parse DT pinconf parameters |
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* @np: DT node |
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* @params: Array of describing generic parameters |
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* @count: Number of entries in @params |
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* @cfg: Array of parsed config options |
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* @ncfg: Number of entries in @cfg |
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* |
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* Parse the config options described in @params from @np and puts the result |
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* in @cfg. @cfg does not need to be empty, entries are added beginning at |
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* @ncfg. @ncfg is updated to reflect the number of entries after parsing. @cfg |
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* needs to have enough memory allocated to hold all possible entries. |
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*/ |
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static void parse_dt_cfg(struct device_node *np, |
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const struct pinconf_generic_params *params, |
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unsigned int count, unsigned long *cfg, |
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unsigned int *ncfg) |
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{ |
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int i; |
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for (i = 0; i < count; i++) { |
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u32 val; |
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int ret; |
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const struct pinconf_generic_params *par = ¶ms[i]; |
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ret = of_property_read_u32(np, par->property, &val); |
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/* property not found */ |
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if (ret == -EINVAL) |
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continue; |
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/* use default value, when no value is specified */ |
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if (ret) |
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val = par->default_value; |
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pr_debug("found %s with value %u\n", par->property, val); |
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cfg[*ncfg] = pinconf_to_config_packed(par->param, val); |
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(*ncfg)++; |
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} |
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} |
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/** |
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* pinconf_generic_parse_dt_config() |
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* parse the config properties into generic pinconfig values. |
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* @np: node containing the pinconfig properties |
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* @pctldev: pincontrol device |
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* @configs: array with nconfigs entries containing the generic pinconf values |
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* must be freed when no longer necessary. |
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* @nconfigs: number of configurations |
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*/ |
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int pinconf_generic_parse_dt_config(struct device_node *np, |
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struct pinctrl_dev *pctldev, |
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unsigned long **configs, |
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unsigned int *nconfigs) |
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{ |
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unsigned long *cfg; |
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unsigned int max_cfg, ncfg = 0; |
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int ret; |
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if (!np) |
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return -EINVAL; |
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/* allocate a temporary array big enough to hold one of each option */ |
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max_cfg = ARRAY_SIZE(dt_params); |
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if (pctldev) |
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max_cfg += pctldev->desc->num_custom_params; |
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cfg = kcalloc(max_cfg, sizeof(*cfg), GFP_KERNEL); |
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if (!cfg) |
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return -ENOMEM; |
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parse_dt_cfg(np, dt_params, ARRAY_SIZE(dt_params), cfg, &ncfg); |
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if (pctldev && pctldev->desc->num_custom_params && |
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pctldev->desc->custom_params) |
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parse_dt_cfg(np, pctldev->desc->custom_params, |
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pctldev->desc->num_custom_params, cfg, &ncfg); |
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ret = 0; |
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/* no configs found at all */ |
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if (ncfg == 0) { |
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*configs = NULL; |
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*nconfigs = 0; |
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goto out; |
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} |
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/* |
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* Now limit the number of configs to the real number of |
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* found properties. |
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*/ |
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*configs = kmemdup(cfg, ncfg * sizeof(unsigned long), GFP_KERNEL); |
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if (!*configs) { |
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ret = -ENOMEM; |
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goto out; |
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} |
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*nconfigs = ncfg; |
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out: |
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kfree(cfg); |
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return ret; |
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} |
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EXPORT_SYMBOL_GPL(pinconf_generic_parse_dt_config); |
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int pinconf_generic_dt_subnode_to_map(struct pinctrl_dev *pctldev, |
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struct device_node *np, struct pinctrl_map **map, |
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unsigned *reserved_maps, unsigned *num_maps, |
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enum pinctrl_map_type type) |
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{ |
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int ret; |
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const char *function; |
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struct device *dev = pctldev->dev; |
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unsigned long *configs = NULL; |
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unsigned num_configs = 0; |
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unsigned reserve, strings_count; |
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struct property *prop; |
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const char *group; |
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const char *subnode_target_type = "pins"; |
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ret = of_property_count_strings(np, "pins"); |
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if (ret < 0) { |
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ret = of_property_count_strings(np, "groups"); |
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if (ret < 0) |
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/* skip this node; may contain config child nodes */ |
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return 0; |
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if (type == PIN_MAP_TYPE_INVALID) |
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type = PIN_MAP_TYPE_CONFIGS_GROUP; |
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subnode_target_type = "groups"; |
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} else { |
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if (type == PIN_MAP_TYPE_INVALID) |
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type = PIN_MAP_TYPE_CONFIGS_PIN; |
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} |
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strings_count = ret; |
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ret = of_property_read_string(np, "function", &function); |
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if (ret < 0) { |
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/* EINVAL=missing, which is fine since it's optional */ |
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if (ret != -EINVAL) |
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dev_err(dev, "%pOF: could not parse property function\n", |
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np); |
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function = NULL; |
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} |
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ret = pinconf_generic_parse_dt_config(np, pctldev, &configs, |
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&num_configs); |
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if (ret < 0) { |
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dev_err(dev, "%pOF: could not parse node property\n", np); |
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return ret; |
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} |
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reserve = 0; |
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if (function != NULL) |
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reserve++; |
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if (num_configs) |
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reserve++; |
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reserve *= strings_count; |
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ret = pinctrl_utils_reserve_map(pctldev, map, reserved_maps, |
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num_maps, reserve); |
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if (ret < 0) |
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goto exit; |
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of_property_for_each_string(np, subnode_target_type, prop, group) { |
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if (function) { |
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ret = pinctrl_utils_add_map_mux(pctldev, map, |
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reserved_maps, num_maps, group, |
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function); |
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if (ret < 0) |
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goto exit; |
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} |
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if (num_configs) { |
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ret = pinctrl_utils_add_map_configs(pctldev, map, |
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reserved_maps, num_maps, group, configs, |
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num_configs, type); |
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if (ret < 0) |
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goto exit; |
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} |
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} |
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ret = 0; |
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exit: |
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kfree(configs); |
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return ret; |
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} |
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EXPORT_SYMBOL_GPL(pinconf_generic_dt_subnode_to_map); |
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int pinconf_generic_dt_node_to_map(struct pinctrl_dev *pctldev, |
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struct device_node *np_config, struct pinctrl_map **map, |
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unsigned *num_maps, enum pinctrl_map_type type) |
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{ |
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unsigned reserved_maps; |
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struct device_node *np; |
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int ret; |
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reserved_maps = 0; |
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*map = NULL; |
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*num_maps = 0; |
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ret = pinconf_generic_dt_subnode_to_map(pctldev, np_config, map, |
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&reserved_maps, num_maps, type); |
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if (ret < 0) |
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goto exit; |
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for_each_available_child_of_node(np_config, np) { |
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ret = pinconf_generic_dt_subnode_to_map(pctldev, np, map, |
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&reserved_maps, num_maps, type); |
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if (ret < 0) |
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goto exit; |
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} |
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return 0; |
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exit: |
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pinctrl_utils_free_map(pctldev, *map, *num_maps); |
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return ret; |
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} |
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EXPORT_SYMBOL_GPL(pinconf_generic_dt_node_to_map); |
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void pinconf_generic_dt_free_map(struct pinctrl_dev *pctldev, |
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struct pinctrl_map *map, |
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unsigned num_maps) |
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{ |
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pinctrl_utils_free_map(pctldev, map, num_maps); |
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} |
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EXPORT_SYMBOL_GPL(pinconf_generic_dt_free_map); |
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#endif
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