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![Sherman Yin](/assets/img/avatar_default.png)
This commit adds slew-rate and input-enable/disable support for pinconf -generic. Signed-off-by: Sherman Yin <syin@broadcom.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
339 lines
9.3 KiB
C
339 lines
9.3 KiB
C
/*
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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 <linus.walleij@linaro.org>
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*
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* License terms: GNU General Public License (GPL) version 2
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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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struct pin_config_item {
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const enum pin_config_param param;
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const char * const display;
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const char * const format;
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};
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#define PCONFDUMP(a, b, c) { .param = a, .display = b, .format = c }
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static struct pin_config_item conf_items[] = {
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PCONFDUMP(PIN_CONFIG_BIAS_DISABLE, "input bias disabled", NULL),
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PCONFDUMP(PIN_CONFIG_BIAS_HIGH_IMPEDANCE, "input bias high impedance", NULL),
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PCONFDUMP(PIN_CONFIG_BIAS_BUS_HOLD, "input bias bus hold", NULL),
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PCONFDUMP(PIN_CONFIG_BIAS_PULL_UP, "input bias pull up", NULL),
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PCONFDUMP(PIN_CONFIG_BIAS_PULL_DOWN, "input bias pull down", NULL),
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PCONFDUMP(PIN_CONFIG_BIAS_PULL_PIN_DEFAULT,
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"input bias pull to pin specific state", NULL),
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PCONFDUMP(PIN_CONFIG_DRIVE_PUSH_PULL, "output drive push pull", NULL),
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PCONFDUMP(PIN_CONFIG_DRIVE_OPEN_DRAIN, "output drive open drain", NULL),
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PCONFDUMP(PIN_CONFIG_DRIVE_OPEN_SOURCE, "output drive open source", NULL),
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PCONFDUMP(PIN_CONFIG_DRIVE_STRENGTH, "output drive strength", "mA"),
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PCONFDUMP(PIN_CONFIG_INPUT_ENABLE, "input enabled", NULL),
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PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT_ENABLE, "input schmitt enabled", NULL),
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PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT, "input schmitt trigger", NULL),
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PCONFDUMP(PIN_CONFIG_INPUT_DEBOUNCE, "input debounce", "usec"),
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PCONFDUMP(PIN_CONFIG_POWER_SOURCE, "pin power source", "selector"),
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PCONFDUMP(PIN_CONFIG_SLEW_RATE, "slew rate", NULL),
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PCONFDUMP(PIN_CONFIG_LOW_POWER_MODE, "pin low power", "mode"),
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PCONFDUMP(PIN_CONFIG_OUTPUT, "pin output", "level"),
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};
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void pinconf_generic_dump_pin(struct pinctrl_dev *pctldev,
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struct seq_file *s, unsigned pin)
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{
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const struct pinconf_ops *ops = pctldev->desc->confops;
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int i;
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if (!ops->is_generic)
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return;
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for (i = 0; i < ARRAY_SIZE(conf_items); 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(conf_items[i].param, 0);
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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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/* Space between multiple configs */
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seq_puts(s, " ");
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seq_puts(s, conf_items[i].display);
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/* Print unit if available */
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if (conf_items[i].format &&
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pinconf_to_config_argument(config) != 0)
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seq_printf(s, " (%u %s)",
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pinconf_to_config_argument(config),
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conf_items[i].format);
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}
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}
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void pinconf_generic_dump_group(struct pinctrl_dev *pctldev,
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struct seq_file *s, const char *gname)
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{
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const struct pinconf_ops *ops = pctldev->desc->confops;
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int i;
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if (!ops->is_generic)
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return;
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for (i = 0; i < ARRAY_SIZE(conf_items); 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(conf_items[i].param, 0);
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ret = pin_config_group_get(dev_name(pctldev->dev), gname,
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&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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/* Space between multiple configs */
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seq_puts(s, " ");
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seq_puts(s, conf_items[i].display);
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/* Print unit if available */
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if (conf_items[i].format && config != 0)
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seq_printf(s, " (%u %s)",
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pinconf_to_config_argument(config),
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conf_items[i].format);
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}
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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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}
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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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struct pinconf_generic_dt_params {
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const char * const property;
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enum pin_config_param param;
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u32 default_value;
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};
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static struct pinconf_generic_dt_params dt_params[] = {
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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-bus-hold", PIN_CONFIG_BIAS_BUS_HOLD, 0 },
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{ "bias-pull-up", PIN_CONFIG_BIAS_PULL_UP, 1 },
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{ "bias-pull-down", PIN_CONFIG_BIAS_PULL_DOWN, 1 },
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{ "bias-pull-pin-default", PIN_CONFIG_BIAS_PULL_PIN_DEFAULT, 1 },
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{ "drive-push-pull", PIN_CONFIG_DRIVE_PUSH_PULL, 0 },
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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-strength", PIN_CONFIG_DRIVE_STRENGTH, 0 },
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{ "input-enable", PIN_CONFIG_INPUT_ENABLE, 1 },
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{ "input-disable", PIN_CONFIG_INPUT_ENABLE, 0 },
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{ "input-schmitt-enable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 1 },
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{ "input-schmitt-disable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 0 },
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{ "input-debounce", PIN_CONFIG_INPUT_DEBOUNCE, 0 },
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{ "low-power-enable", PIN_CONFIG_LOW_POWER_MODE, 1 },
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{ "low-power-disable", PIN_CONFIG_LOW_POWER_MODE, 0 },
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{ "output-low", PIN_CONFIG_OUTPUT, 0, },
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{ "output-high", PIN_CONFIG_OUTPUT, 1, },
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{ "slew-rate", PIN_CONFIG_SLEW_RATE, 0},
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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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* @configs: array with nconfigs entries containing the generic pinconf values
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* @nconfigs: umber of configurations
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*/
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int pinconf_generic_parse_dt_config(struct device_node *np,
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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 ncfg = 0;
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int ret;
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int i;
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u32 val;
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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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cfg = kzalloc(sizeof(*cfg) * ARRAY_SIZE(dt_params), GFP_KERNEL);
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if (!cfg)
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return -ENOMEM;
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for (i = 0; i < ARRAY_SIZE(dt_params); i++) {
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struct pinconf_generic_dt_params *par = &dt_params[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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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 = kzalloc(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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memcpy(*configs, cfg, ncfg * sizeof(unsigned long));
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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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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;
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struct property *prop;
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const char *group;
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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, "could not parse property function\n");
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function = NULL;
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}
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ret = pinconf_generic_parse_dt_config(np, &configs, &num_configs);
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if (ret < 0) {
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dev_err(dev, "could not parse node property\n");
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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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ret = of_property_count_strings(np, "pins");
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if (ret < 0) {
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dev_err(dev, "could not parse property pins\n");
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goto exit;
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}
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reserve *= ret;
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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, "pins", 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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for_each_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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pinctrl_utils_dt_free_map(pctldev, *map, *num_maps);
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return ret;
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}
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(pinconf_generic_dt_node_to_map);
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#endif
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