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/*
* Pinconf driver for TI DA850/OMAP-L138/AM18XX pullup/pulldown groups
*
* Copyright (C) 2016 David Lechner
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*/
#include <linux/bitops.h>
#include <linux/device.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/pinctrl/pinconf.h>
#include <linux/pinctrl/pinconf-generic.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/platform_device.h>
#define DA850_PUPD_ENA 0x00
#define DA850_PUPD_SEL 0x04
struct da850_pupd_data {
void __iomem *base;
struct pinctrl_desc desc;
struct pinctrl_dev *pinctrl;
};
static const char * const da850_pupd_group_names[] = {
"cp0", "cp1", "cp2", "cp3", "cp4", "cp5", "cp6", "cp7",
"cp8", "cp9", "cp10", "cp11", "cp12", "cp13", "cp14", "cp15",
"cp16", "cp17", "cp18", "cp19", "cp20", "cp21", "cp22", "cp23",
"cp24", "cp25", "cp26", "cp27", "cp28", "cp29", "cp30", "cp31",
};
static int da850_pupd_get_groups_count(struct pinctrl_dev *pctldev)
{
return ARRAY_SIZE(da850_pupd_group_names);
}
static const char *da850_pupd_get_group_name(struct pinctrl_dev *pctldev,
unsigned int selector)
{
return da850_pupd_group_names[selector];
}
static int da850_pupd_get_group_pins(struct pinctrl_dev *pctldev,
unsigned int selector,
const unsigned int **pins,
unsigned int *num_pins)
{
*num_pins = 0;
return 0;
}
static const struct pinctrl_ops da850_pupd_pctlops = {
.get_groups_count = da850_pupd_get_groups_count,
.get_group_name = da850_pupd_get_group_name,
.get_group_pins = da850_pupd_get_group_pins,
.dt_node_to_map = pinconf_generic_dt_node_to_map_group,
.dt_free_map = pinconf_generic_dt_free_map,
};
static int da850_pupd_pin_config_group_get(struct pinctrl_dev *pctldev,
unsigned int selector,
unsigned long *config)
{
struct da850_pupd_data *data = pinctrl_dev_get_drvdata(pctldev);
enum pin_config_param param = pinconf_to_config_param(*config);
u32 val;
u16 arg;
val = readl(data->base + DA850_PUPD_ENA);
arg = !!(~val & BIT(selector));
switch (param) {
case PIN_CONFIG_BIAS_DISABLE:
break;
case PIN_CONFIG_BIAS_PULL_UP:
case PIN_CONFIG_BIAS_PULL_DOWN:
if (arg) {
/* bias is disabled */
arg = 0;
break;
}
val = readl(data->base + DA850_PUPD_SEL);
if (param == PIN_CONFIG_BIAS_PULL_DOWN)
val = ~val;
arg = !!(val & BIT(selector));
break;
default:
return -EINVAL;
}
*config = pinconf_to_config_packed(param, arg);
return 0;
}
static int da850_pupd_pin_config_group_set(struct pinctrl_dev *pctldev,
unsigned int selector,
unsigned long *configs,
unsigned int num_configs)
{
struct da850_pupd_data *data = pinctrl_dev_get_drvdata(pctldev);
u32 ena, sel;
enum pin_config_param param;
u16 arg;
int i;
ena = readl(data->base + DA850_PUPD_ENA);
sel = readl(data->base + DA850_PUPD_SEL);
for (i = 0; i < num_configs; i++) {
param = pinconf_to_config_param(configs[i]);
arg = pinconf_to_config_argument(configs[i]);
switch (param) {
case PIN_CONFIG_BIAS_DISABLE:
ena &= ~BIT(selector);
break;
case PIN_CONFIG_BIAS_PULL_UP:
ena |= BIT(selector);
sel |= BIT(selector);
break;
case PIN_CONFIG_BIAS_PULL_DOWN:
ena |= BIT(selector);
sel &= ~BIT(selector);
break;
default:
return -EINVAL;
}
}
writel(sel, data->base + DA850_PUPD_SEL);
writel(ena, data->base + DA850_PUPD_ENA);
return 0;
}
static const struct pinconf_ops da850_pupd_confops = {
.is_generic = true,
.pin_config_group_get = da850_pupd_pin_config_group_get,
.pin_config_group_set = da850_pupd_pin_config_group_set,
};
static int da850_pupd_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct da850_pupd_data *data;
struct resource *res;
data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
data->base = devm_ioremap_resource(dev, res);
if (IS_ERR(data->base)) {
dev_err(dev, "Could not map resource\n");
return PTR_ERR(data->base);
}
data->desc.name = dev_name(dev);
data->desc.pctlops = &da850_pupd_pctlops;
data->desc.confops = &da850_pupd_confops;
data->desc.owner = THIS_MODULE;
data->pinctrl = devm_pinctrl_register(dev, &data->desc, data);
if (IS_ERR(data->pinctrl)) {
dev_err(dev, "Failed to register pinctrl\n");
return PTR_ERR(data->pinctrl);
}
platform_set_drvdata(pdev, data);
return 0;
}
static int da850_pupd_remove(struct platform_device *pdev)
{
return 0;
}
static const struct of_device_id da850_pupd_of_match[] = {
{ .compatible = "ti,da850-pupd" },
{ }
};
static struct platform_driver da850_pupd_driver = {
.driver = {
.name = "ti-da850-pupd",
.of_match_table = da850_pupd_of_match,
},
.probe = da850_pupd_probe,
.remove = da850_pupd_remove,
};
module_platform_driver(da850_pupd_driver);
MODULE_AUTHOR("David Lechner <david@lechnology.com>");
MODULE_DESCRIPTION("TI DA850/OMAP-L138/AM18XX pullup/pulldown configuration");
MODULE_LICENSE("GPL");
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