--- /dev/null
+/*
+ * 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");
projects / linux.git / commitdiff