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>
This commit is contained in:
David Lechner
Linus Walleij
parent
342030c7a2
commit
1ff91f0ae3
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@ -93,6 +93,15 @@ config PINCTRL_AMD
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Requires ACPI/FDT device enumeration code to set up a platform
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device.
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config PINCTRL_DA850_PUPD
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tristate "TI DA850/OMAP-L138/AM18XX pullup/pulldown groups"
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depends on OF && (ARCH_DAVINCI_DA850 || COMPILE_TEST)
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select PINCONF
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select GENERIC_PINCONF
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help
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Driver for TI DA850/OMAP-L138/AM18XX pinconf. Used to control
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pullup/pulldown pin groups.
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config PINCTRL_DIGICOLOR
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bool
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depends on OF && (ARCH_DIGICOLOR || COMPILE_TEST)
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@ -14,6 +14,7 @@ obj-$(CONFIG_PINCTRL_BF60x) += pinctrl-adi2-bf60x.o
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obj-$(CONFIG_PINCTRL_AT91) += pinctrl-at91.o
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obj-$(CONFIG_PINCTRL_AT91PIO4) += pinctrl-at91-pio4.o
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obj-$(CONFIG_PINCTRL_AMD) += pinctrl-amd.o
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obj-$(CONFIG_PINCTRL_DA850_PUPD) += pinctrl-da850-pupd.o
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obj-$(CONFIG_PINCTRL_DIGICOLOR) += pinctrl-digicolor.o
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obj-$(CONFIG_PINCTRL_FALCON) += pinctrl-falcon.o
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obj-$(CONFIG_PINCTRL_MAX77620) += pinctrl-max77620.o
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@ -0,0 +1,210 @@
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/*
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* Pinconf driver for TI DA850/OMAP-L138/AM18XX pullup/pulldown groups
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*
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* Copyright (C) 2016 David Lechner
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*/
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#include <linux/bitops.h>
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#include <linux/device.h>
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#include <linux/io.h>
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#include <linux/ioport.h>
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#include <linux/mod_devicetable.h>
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#include <linux/module.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/pinctrl/pinctrl.h>
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#include <linux/platform_device.h>
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#define DA850_PUPD_ENA 0x00
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#define DA850_PUPD_SEL 0x04
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struct da850_pupd_data {
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void __iomem *base;
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struct pinctrl_desc desc;
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struct pinctrl_dev *pinctrl;
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};
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static const char * const da850_pupd_group_names[] = {
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"cp0", "cp1", "cp2", "cp3", "cp4", "cp5", "cp6", "cp7",
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"cp8", "cp9", "cp10", "cp11", "cp12", "cp13", "cp14", "cp15",
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"cp16", "cp17", "cp18", "cp19", "cp20", "cp21", "cp22", "cp23",
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"cp24", "cp25", "cp26", "cp27", "cp28", "cp29", "cp30", "cp31",
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};
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static int da850_pupd_get_groups_count(struct pinctrl_dev *pctldev)
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{
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return ARRAY_SIZE(da850_pupd_group_names);
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}
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static const char *da850_pupd_get_group_name(struct pinctrl_dev *pctldev,
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unsigned int selector)
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{
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return da850_pupd_group_names[selector];
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}
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static int da850_pupd_get_group_pins(struct pinctrl_dev *pctldev,
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unsigned int selector,
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const unsigned int **pins,
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unsigned int *num_pins)
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{
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*num_pins = 0;
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return 0;
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}
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static const struct pinctrl_ops da850_pupd_pctlops = {
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.get_groups_count = da850_pupd_get_groups_count,
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.get_group_name = da850_pupd_get_group_name,
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.get_group_pins = da850_pupd_get_group_pins,
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.dt_node_to_map = pinconf_generic_dt_node_to_map_group,
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.dt_free_map = pinconf_generic_dt_free_map,
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};
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static int da850_pupd_pin_config_group_get(struct pinctrl_dev *pctldev,
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unsigned int selector,
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unsigned long *config)
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{
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struct da850_pupd_data *data = pinctrl_dev_get_drvdata(pctldev);
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enum pin_config_param param = pinconf_to_config_param(*config);
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u32 val;
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u16 arg;
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val = readl(data->base + DA850_PUPD_ENA);
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arg = !!(~val & BIT(selector));
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switch (param) {
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case PIN_CONFIG_BIAS_DISABLE:
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break;
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case PIN_CONFIG_BIAS_PULL_UP:
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case PIN_CONFIG_BIAS_PULL_DOWN:
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if (arg) {
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/* bias is disabled */
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arg = 0;
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break;
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}
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val = readl(data->base + DA850_PUPD_SEL);
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if (param == PIN_CONFIG_BIAS_PULL_DOWN)
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val = ~val;
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arg = !!(val & BIT(selector));
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break;
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default:
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return -EINVAL;
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}
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*config = pinconf_to_config_packed(param, arg);
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return 0;
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}
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static int da850_pupd_pin_config_group_set(struct pinctrl_dev *pctldev,
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unsigned int selector,
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unsigned long *configs,
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unsigned int num_configs)
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{
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struct da850_pupd_data *data = pinctrl_dev_get_drvdata(pctldev);
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u32 ena, sel;
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enum pin_config_param param;
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u16 arg;
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int i;
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ena = readl(data->base + DA850_PUPD_ENA);
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sel = readl(data->base + DA850_PUPD_SEL);
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for (i = 0; i < num_configs; i++) {
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param = pinconf_to_config_param(configs[i]);
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arg = pinconf_to_config_argument(configs[i]);
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switch (param) {
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case PIN_CONFIG_BIAS_DISABLE:
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ena &= ~BIT(selector);
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break;
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case PIN_CONFIG_BIAS_PULL_UP:
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ena |= BIT(selector);
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sel |= BIT(selector);
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break;
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case PIN_CONFIG_BIAS_PULL_DOWN:
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ena |= BIT(selector);
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sel &= ~BIT(selector);
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break;
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default:
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return -EINVAL;
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}
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}
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writel(sel, data->base + DA850_PUPD_SEL);
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writel(ena, data->base + DA850_PUPD_ENA);
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return 0;
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}
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static const struct pinconf_ops da850_pupd_confops = {
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.is_generic = true,
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.pin_config_group_get = da850_pupd_pin_config_group_get,
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.pin_config_group_set = da850_pupd_pin_config_group_set,
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};
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static int da850_pupd_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct da850_pupd_data *data;
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struct resource *res;
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data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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data->base = devm_ioremap_resource(dev, res);
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if (IS_ERR(data->base)) {
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dev_err(dev, "Could not map resource\n");
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return PTR_ERR(data->base);
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}
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data->desc.name = dev_name(dev);
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data->desc.pctlops = &da850_pupd_pctlops;
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data->desc.confops = &da850_pupd_confops;
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data->desc.owner = THIS_MODULE;
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data->pinctrl = devm_pinctrl_register(dev, &data->desc, data);
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if (IS_ERR(data->pinctrl)) {
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dev_err(dev, "Failed to register pinctrl\n");
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return PTR_ERR(data->pinctrl);
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}
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platform_set_drvdata(pdev, data);
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return 0;
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}
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static int da850_pupd_remove(struct platform_device *pdev)
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{
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return 0;
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}
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static const struct of_device_id da850_pupd_of_match[] = {
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{ .compatible = "ti,da850-pupd" },
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{ }
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};
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static struct platform_driver da850_pupd_driver = {
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.driver = {
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.name = "ti-da850-pupd",
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.of_match_table = da850_pupd_of_match,
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},
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.probe = da850_pupd_probe,
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.remove = da850_pupd_remove,
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};
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module_platform_driver(da850_pupd_driver);
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MODULE_AUTHOR("David Lechner <david@lechnology.com>");
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MODULE_DESCRIPTION("TI DA850/OMAP-L138/AM18XX pullup/pulldown configuration");
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MODULE_LICENSE("GPL");
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