diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/pinctrl/Kconfig | 9 | ||||
| -rw-r--r-- | drivers/pinctrl/Makefile | 1 | ||||
| -rw-r--r-- | drivers/pinctrl/pinctrl-da850-pupd.c | 210 |
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"); |