pinctrl: New driver for TI DA850/OMAP-L138/AM18XX pinconf

This adds a new driver for pinconf on TI DA850/OMAP-L138/AM18XX. These
SoCs have a separate controller for controlling pullup/pulldown groups.

Signed-off-by: David Lechner <david@lechnology.com>
Reviewed-by: Sekhar Nori <nsekhar@ti.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

3 files changed, 220 insertions, 0 deletions

diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig
index 5f40ad64e8f5..54044a8ecbd7 100644
--- a/drivers/pinctrl/Kconfig
+++ b/drivers/pinctrl/Kconfig
@@ -93,6 +93,15 @@ config PINCTRL_AMD
 	  Requires ACPI/FDT device enumeration code to set up a platform
 	  device.
 
+config PINCTRL_DA850_PUPD
+	tristate "TI DA850/OMAP-L138/AM18XX pullup/pulldown groups"
+	depends on OF && (ARCH_DAVINCI_DA850 || COMPILE_TEST)
+	select PINCONF
+	select GENERIC_PINCONF
+	help
+	  Driver for TI DA850/OMAP-L138/AM18XX pinconf. Used to control
+	  pullup/pulldown pin groups.
+
 config PINCTRL_DIGICOLOR
 	bool
 	depends on OF && (ARCH_DIGICOLOR || COMPILE_TEST)
diff --git a/drivers/pinctrl/Makefile b/drivers/pinctrl/Makefile
index 3b8e6f726acb..25d50a86981d 100644
--- a/drivers/pinctrl/Makefile
+++ b/drivers/pinctrl/Makefile
@@ -14,6 +14,7 @@ obj-$(CONFIG_PINCTRL_BF60x)	+= pinctrl-adi2-bf60x.o
 obj-$(CONFIG_PINCTRL_AT91)	+= pinctrl-at91.o
 obj-$(CONFIG_PINCTRL_AT91PIO4)	+= pinctrl-at91-pio4.o
 obj-$(CONFIG_PINCTRL_AMD)	+= pinctrl-amd.o
+obj-$(CONFIG_PINCTRL_DA850_PUPD) += pinctrl-da850-pupd.o
 obj-$(CONFIG_PINCTRL_DIGICOLOR)	+= pinctrl-digicolor.o
 obj-$(CONFIG_PINCTRL_FALCON)	+= pinctrl-falcon.o
 obj-$(CONFIG_PINCTRL_MAX77620)	+= pinctrl-max77620.o
diff --git a/drivers/pinctrl/pinctrl-da850-pupd.c b/drivers/pinctrl/pinctrl-da850-pupd.c
new file mode 100644
index 000000000000..b36a90a3f3e4
--- /dev/null
+++ b/drivers/pinctrl/pinctrl-da850-pupd.c
@@ -0,0 +1,210 @@
+/*
+ * 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");