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199 lines
4.8 KiB
199 lines
4.8 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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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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#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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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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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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data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); |
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if (!data) |
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return -ENOMEM; |
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data->base = devm_platform_ioremap_resource(pdev, 0); |
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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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MODULE_DEVICE_TABLE(of, da850_pupd_of_match); |
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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 <[email protected]>"); |
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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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