drivers/pinctrl/pinctrl-at91-pio4.c - u-boot - Git at Google

 // SPDX-License-Identifier: GPL-2.0+
 /*
  * Atmel PIO4 pinctrl driver
  *
  * Copyright (C) 2016 Atmel Corporation
  *               Wenyou.Yang <wenyou.yang@atmel.com>
  */

 #include <common.h>
 #include <dm.h>
 #include <asm/global_data.h>
 #include <dm/device-internal.h>
 #include <dm/lists.h>
 #include <dm/pinctrl.h>
 #include <linux/bitops.h>
 #include <linux/io.h>
 #include <linux/err.h>
 #include <dm/uclass-internal.h>
 #include <mach/atmel_pio4.h>

 DECLARE_GLOBAL_DATA_PTR;

 /*
  * Warning:
  * In order to not introduce confusion between Atmel PIO groups and pinctrl
  * framework groups, Atmel PIO groups will be called banks.
  */

 struct atmel_pio4_plat {
 	struct atmel_pio4_port *reg_base;
 	unsigned int slew_rate_support;
 };

 /*
  * Table keeping track of the pinctrl driver's slew rate support and the
  * corresponding index into the struct udevice_id of the gpio_atmel_pio4 GPIO
  * driver. This has been done in order to align the DT of U-Boot with the DT of
  * Linux. In Linux, a phandle from a '-gpio' DT property is linked to the
  * pinctrl driver, unlike U-Boot which redirects this phandle to a corresponding
  * UCLASS_GPIO driver. Thus, in order to link the two, a hook to the bind method
  * of the pinctrl driver in U-Boot has been added. This bind method will attach
  * the GPIO driver to the pinctrl DT node using this table.
  * @slew_rate_support	 pinctrl driver's slew rate support
  * @gdidx		 index into the GPIO driver's struct udevide_id
  *			 (needed in order to properly bind with driver_data)
  */

 struct atmel_pinctrl_data {
 	unsigned int slew_rate_support;
 	int gdidx;
 };

 static const struct pinconf_param conf_params[] = {
 	{ "bias-disable", PIN_CONFIG_BIAS_DISABLE, 0 },
 	{ "bias-pull-up", PIN_CONFIG_BIAS_PULL_UP, 1 },
 	{ "bias-pull-down", PIN_CONFIG_BIAS_PULL_DOWN, 1 },
 	{ "drive-open-drain", PIN_CONFIG_DRIVE_OPEN_DRAIN, 0 },
 	{ "input-schmitt-disable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 0 },
 	{ "input-schmitt-enable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 1 },
 	{ "input-debounce", PIN_CONFIG_INPUT_DEBOUNCE, 0 },
 	{ "atmel,drive-strength", PIN_CONFIG_DRIVE_STRENGTH, 0 },
 	{ "slew-rate", PIN_CONFIG_SLEW_RATE, 0},
 };

 static u32 atmel_pinctrl_get_pinconf(struct udevice *config,
 				     struct atmel_pio4_plat *plat)
 {
 	const struct pinconf_param *params;
 	u32 param, arg, conf = 0;
 	u32 i;
 	u32 val;

 	for (i = 0; i < ARRAY_SIZE(conf_params); i++) {
 		params = &conf_params[i];
 		if (!dev_read_prop(config, params->property, NULL))
 			continue;

 		param = params->param;
 		arg = params->default_value;

 		/* Keep slew rate enabled by default. */
 		if (plat->slew_rate_support)
 			conf |= ATMEL_PIO_SR;

 		switch (param) {
 		case PIN_CONFIG_BIAS_DISABLE:
 			conf &= (~ATMEL_PIO_PUEN_MASK);
 			conf &= (~ATMEL_PIO_PDEN_MASK);
 			break;
 		case PIN_CONFIG_BIAS_PULL_UP:
 			conf |= ATMEL_PIO_PUEN_MASK;
 			break;
 		case PIN_CONFIG_BIAS_PULL_DOWN:
 			conf |= ATMEL_PIO_PDEN_MASK;
 			break;
 		case PIN_CONFIG_DRIVE_OPEN_DRAIN:
 			if (arg == 0)
 				conf &= (~ATMEL_PIO_OPD_MASK);
 			else
 				conf |= ATMEL_PIO_OPD_MASK;
 			break;
 		case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
 			if (arg == 0)
 				conf |= ATMEL_PIO_SCHMITT_MASK;
 			else
 				conf &= (~ATMEL_PIO_SCHMITT_MASK);
 			break;
 		case PIN_CONFIG_INPUT_DEBOUNCE:
 			if (arg == 0) {
 				conf &= (~ATMEL_PIO_IFEN_MASK);
 				conf &= (~ATMEL_PIO_IFSCEN_MASK);
 			} else {
 				conf |= ATMEL_PIO_IFEN_MASK;
 				conf |= ATMEL_PIO_IFSCEN_MASK;
 			}
 			break;
 		case PIN_CONFIG_DRIVE_STRENGTH:
 			dev_read_u32(config, params->property, &val);
 			conf &= (~ATMEL_PIO_DRVSTR_MASK);
 			conf |= (val << ATMEL_PIO_DRVSTR_OFFSET)
 				& ATMEL_PIO_DRVSTR_MASK;
 			break;
 		case PIN_CONFIG_SLEW_RATE:
 			if (!plat->slew_rate_support)
 				break;

 			dev_read_u32(config, params->property, &val);
 			/* And disable it if requested. */
 			if (val == 0)
 				conf &= ~ATMEL_PIO_SR;
 			break;
 		default:
 			printf("%s: Unsupported configuration parameter: %u\n",
 			       __func__, param);
 			break;
 		}
 	}

 	return conf;
 }

 static inline struct atmel_pio4_port *atmel_pio4_bank_base(struct udevice *dev,
 							   u32 bank)
 {
 	struct atmel_pio4_plat *plat = dev_get_plat(dev);
 	struct atmel_pio4_port *bank_base =
 			(struct atmel_pio4_port *)((u32)plat->reg_base +
 			ATMEL_PIO_BANK_OFFSET * bank);

 	return bank_base;
 }

 #define MAX_PINMUX_ENTRIES	40

 static int atmel_process_config_dev(struct udevice *dev, struct udevice *config)
 {
 	struct atmel_pio4_plat *plat = dev_get_plat(dev);
 	int node = dev_of_offset(config);
 	struct atmel_pio4_port *bank_base;
 	u32 offset, func, bank, line;
 	u32 cells[MAX_PINMUX_ENTRIES];
 	u32 i, conf;
 	int count;

 	conf = atmel_pinctrl_get_pinconf(config, plat);

 	/*
 	 * The only case where this function returns a negative error value
 	 * is when there is no "pinmux" property attached to this node
 	 */
 	count = fdtdec_get_int_array_count(gd->fdt_blob, node, "pinmux",
 					   cells, ARRAY_SIZE(cells));
 	if (count < 0)
 		return count;

 	if (count > MAX_PINMUX_ENTRIES)
 		return -EINVAL;

 	for (i = 0 ; i < count; i++) {
 		offset = ATMEL_GET_PIN_NO(cells[i]);
 		func = ATMEL_GET_PIN_FUNC(cells[i]);

 		bank = ATMEL_PIO_BANK(offset);
 		line = ATMEL_PIO_LINE(offset);

 		bank_base = atmel_pio4_bank_base(dev, bank);

 		writel(BIT(line), &bank_base->mskr);
 		conf &= (~ATMEL_PIO_CFGR_FUNC_MASK);
 		conf |= (func & ATMEL_PIO_CFGR_FUNC_MASK);
 		writel(conf, &bank_base->cfgr);
 	}

 	return 0;
 }

 static int atmel_pinctrl_set_state(struct udevice *dev, struct udevice *config)
 {
 	int node = dev_of_offset(config);
 	struct udevice *subconfig;
 	int subnode, subnode_count = 0, ret;

 	/*
 	 * If this function returns a negative error code then that means
 	 * that either the "pinmux" property of the node is missing, which is
 	 * the case for pinctrl nodes that do not have all the pins with the
 	 * same configuration and are split in multiple subnodes, or something
 	 * else went wrong and we have to stop. For the latter case, it would
 	 * mean that the node failed even though it has no subnodes.
 	 */
 	ret = atmel_process_config_dev(dev, config);
 	if (!ret)
 		return ret;

 	/*
 	 * If we reach here, it means that the subnode pinctrl's DT has multiple
 	 * subnodes. If it does not, then something else went wrong in the
 	 * previous call to atmel_process_config_dev.
 	 */
 	fdt_for_each_subnode(subnode, gd->fdt_blob, node) {
 		/* Get subnode as an udevice */
 		ret = uclass_find_device_by_of_offset(UCLASS_PINCONFIG, subnode,
 						      &subconfig);
 		if (ret)
 			return ret;

 		/*
 		 * If this time the function returns an error code on a subnode
 		 * then something is totally wrong so abort.
 		 */
 		ret = atmel_process_config_dev(dev, subconfig);
 		if (ret)
 			return ret;

 		subnode_count++;
 	}

 	/*
 	 * If we somehow got here and we do not have any subnodes, abort.
 	 */
 	if (!subnode_count)
 		return -EINVAL;

 	return 0;
 }

 const struct pinctrl_ops atmel_pinctrl_ops  = {
 	.set_state = atmel_pinctrl_set_state,
 };

 static int atmel_pinctrl_probe(struct udevice *dev)
 {
 	struct atmel_pio4_plat *plat = dev_get_plat(dev);
 	struct atmel_pinctrl_data *priv = (struct atmel_pinctrl_data *)dev_get_driver_data(dev);
 	fdt_addr_t addr_base;

 	addr_base = dev_read_addr(dev);
 	if (addr_base == FDT_ADDR_T_NONE)
 		return -EINVAL;

 	plat->reg_base = (struct atmel_pio4_port *)addr_base;
 	plat->slew_rate_support = priv->slew_rate_support;

 	return 0;
 }

 static int atmel_pinctrl_bind(struct udevice *dev)
 {
 	struct udevice *g;
 	struct driver *drv;
 	ofnode node = dev_ofnode(dev);
 	struct atmel_pinctrl_data *priv = (struct atmel_pinctrl_data *)dev_get_driver_data(dev);

 	if (!IS_ENABLED(CONFIG_ATMEL_PIO4))
 		return 0;

 	/* Obtain a handle to the GPIO driver */
 	drv = lists_driver_lookup_name("gpio_atmel_pio4");
 	if (!drv)
 		return -ENOENT;

 	/*
 	 * Bind the GPIO driver to the pinctrl DT node, together
 	 * with its corresponding driver_data.
 	 */
 	return device_bind_with_driver_data(dev, drv, drv->name,
 					    drv->of_match[priv->gdidx].data,
 					    node, &g);
 }

 static const struct atmel_pinctrl_data atmel_sama5d2_pinctrl_data = {
 	.gdidx = 0,
 };

 static const struct atmel_pinctrl_data microchip_sama7g5_pinctrl_data = {
 	.slew_rate_support = 1,
 	.gdidx = 1,
 };

 static const struct udevice_id atmel_pinctrl_match[] = {
 	{ .compatible = "atmel,sama5d2-pinctrl",
 	  .data = (ulong)&atmel_sama5d2_pinctrl_data, },
 	{ .compatible = "microchip,sama7g5-pinctrl",
 	  .data = (ulong)&microchip_sama7g5_pinctrl_data, },
 	{}
 };

 U_BOOT_DRIVER(atmel_pinctrl) = {
 	.name = "pinctrl_atmel_pio4",
 	.id = UCLASS_PINCTRL,
 	.of_match = atmel_pinctrl_match,
 	.bind = atmel_pinctrl_bind,
 	.probe = atmel_pinctrl_probe,
 	.plat_auto	= sizeof(struct atmel_pio4_plat),
 	.ops = &atmel_pinctrl_ops,
 };
	// SPDX-License-Identifier: GPL-2.0+
	/*
	* Atmel PIO4 pinctrl driver
	*
	* Copyright (C) 2016 Atmel Corporation
	* Wenyou.Yang <wenyou.yang@atmel.com>
	*/

	#include <common.h>
	#include <dm.h>
	#include <asm/global_data.h>
	#include <dm/device-internal.h>
	#include <dm/lists.h>
	#include <dm/pinctrl.h>
	#include <linux/bitops.h>
	#include <linux/io.h>
	#include <linux/err.h>
	#include <dm/uclass-internal.h>
	#include <mach/atmel_pio4.h>

	DECLARE_GLOBAL_DATA_PTR;

	/*
	* Warning:
	* In order to not introduce confusion between Atmel PIO groups and pinctrl
	* framework groups, Atmel PIO groups will be called banks.
	*/

	struct atmel_pio4_plat {
	struct atmel_pio4_port *reg_base;
	unsigned int slew_rate_support;
	};

	/*
	* Table keeping track of the pinctrl driver's slew rate support and the
	* corresponding index into the struct udevice_id of the gpio_atmel_pio4 GPIO
	* driver. This has been done in order to align the DT of U-Boot with the DT of
	* Linux. In Linux, a phandle from a '-gpio' DT property is linked to the
	* pinctrl driver, unlike U-Boot which redirects this phandle to a corresponding
	* UCLASS_GPIO driver. Thus, in order to link the two, a hook to the bind method
	* of the pinctrl driver in U-Boot has been added. This bind method will attach
	* the GPIO driver to the pinctrl DT node using this table.
	* @slew_rate_support pinctrl driver's slew rate support
	* @gdidx index into the GPIO driver's struct udevide_id
	* (needed in order to properly bind with driver_data)
	*/

	struct atmel_pinctrl_data {
	unsigned int slew_rate_support;
	int gdidx;
	};

	static const struct pinconf_param conf_params[] = {
	{ "bias-disable", PIN_CONFIG_BIAS_DISABLE, 0 },
	{ "bias-pull-up", PIN_CONFIG_BIAS_PULL_UP, 1 },
	{ "bias-pull-down", PIN_CONFIG_BIAS_PULL_DOWN, 1 },
	{ "drive-open-drain", PIN_CONFIG_DRIVE_OPEN_DRAIN, 0 },
	{ "input-schmitt-disable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 0 },
	{ "input-schmitt-enable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 1 },
	{ "input-debounce", PIN_CONFIG_INPUT_DEBOUNCE, 0 },
	{ "atmel,drive-strength", PIN_CONFIG_DRIVE_STRENGTH, 0 },
	{ "slew-rate", PIN_CONFIG_SLEW_RATE, 0},
	};

	static u32 atmel_pinctrl_get_pinconf(struct udevice *config,
	struct atmel_pio4_plat *plat)
	{
	const struct pinconf_param *params;
	u32 param, arg, conf = 0;
	u32 i;
	u32 val;

	for (i = 0; i < ARRAY_SIZE(conf_params); i++) {
	params = &conf_params[i];
	if (!dev_read_prop(config, params->property, NULL))
	continue;

	param = params->param;
	arg = params->default_value;

	/* Keep slew rate enabled by default. */
	if (plat->slew_rate_support)
	conf \|= ATMEL_PIO_SR;

	switch (param) {
	case PIN_CONFIG_BIAS_DISABLE:
	conf &= (~ATMEL_PIO_PUEN_MASK);
	conf &= (~ATMEL_PIO_PDEN_MASK);
	break;
	case PIN_CONFIG_BIAS_PULL_UP:
	conf \|= ATMEL_PIO_PUEN_MASK;
	break;
	case PIN_CONFIG_BIAS_PULL_DOWN:
	conf \|= ATMEL_PIO_PDEN_MASK;
	break;
	case PIN_CONFIG_DRIVE_OPEN_DRAIN:
	if (arg == 0)
	conf &= (~ATMEL_PIO_OPD_MASK);
	else
	conf \|= ATMEL_PIO_OPD_MASK;
	break;
	case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
	if (arg == 0)
	conf \|= ATMEL_PIO_SCHMITT_MASK;
	else
	conf &= (~ATMEL_PIO_SCHMITT_MASK);
	break;
	case PIN_CONFIG_INPUT_DEBOUNCE:
	if (arg == 0) {
	conf &= (~ATMEL_PIO_IFEN_MASK);
	conf &= (~ATMEL_PIO_IFSCEN_MASK);
	} else {
	conf \|= ATMEL_PIO_IFEN_MASK;
	conf \|= ATMEL_PIO_IFSCEN_MASK;
	}
	break;
	case PIN_CONFIG_DRIVE_STRENGTH:
	dev_read_u32(config, params->property, &val);
	conf &= (~ATMEL_PIO_DRVSTR_MASK);
	conf \|= (val << ATMEL_PIO_DRVSTR_OFFSET)
	& ATMEL_PIO_DRVSTR_MASK;
	break;
	case PIN_CONFIG_SLEW_RATE:
	if (!plat->slew_rate_support)
	break;

	dev_read_u32(config, params->property, &val);
	/* And disable it if requested. */
	if (val == 0)
	conf &= ~ATMEL_PIO_SR;
	break;
	default:
	printf("%s: Unsupported configuration parameter: %u\n",
	__func__, param);
	break;
	}
	}

	return conf;
	}

	static inline struct atmel_pio4_port atmel_pio4_bank_base(struct udevice dev,
	u32 bank)
	{
	struct atmel_pio4_plat *plat = dev_get_plat(dev);
	struct atmel_pio4_port *bank_base =
	(struct atmel_pio4_port *)((u32)plat->reg_base +
	ATMEL_PIO_BANK_OFFSET * bank);

	return bank_base;
	}

	#define MAX_PINMUX_ENTRIES 40

	static int atmel_process_config_dev(struct udevice dev, struct udevice config)
	{
	struct atmel_pio4_plat *plat = dev_get_plat(dev);
	int node = dev_of_offset(config);
	struct atmel_pio4_port *bank_base;
	u32 offset, func, bank, line;
	u32 cells[MAX_PINMUX_ENTRIES];
	u32 i, conf;
	int count;

	conf = atmel_pinctrl_get_pinconf(config, plat);

	/*
	* The only case where this function returns a negative error value
	* is when there is no "pinmux" property attached to this node
	*/
	count = fdtdec_get_int_array_count(gd->fdt_blob, node, "pinmux",
	cells, ARRAY_SIZE(cells));
	if (count < 0)
	return count;

	if (count > MAX_PINMUX_ENTRIES)
	return -EINVAL;

	for (i = 0 ; i < count; i++) {
	offset = ATMEL_GET_PIN_NO(cells[i]);
	func = ATMEL_GET_PIN_FUNC(cells[i]);

	bank = ATMEL_PIO_BANK(offset);
	line = ATMEL_PIO_LINE(offset);

	bank_base = atmel_pio4_bank_base(dev, bank);

	writel(BIT(line), &bank_base->mskr);
	conf &= (~ATMEL_PIO_CFGR_FUNC_MASK);
	conf \|= (func & ATMEL_PIO_CFGR_FUNC_MASK);
	writel(conf, &bank_base->cfgr);
	}

	return 0;
	}

	static int atmel_pinctrl_set_state(struct udevice dev, struct udevice config)
	{
	int node = dev_of_offset(config);
	struct udevice *subconfig;
	int subnode, subnode_count = 0, ret;

	/*
	* If this function returns a negative error code then that means
	* that either the "pinmux" property of the node is missing, which is
	* the case for pinctrl nodes that do not have all the pins with the
	* same configuration and are split in multiple subnodes, or something
	* else went wrong and we have to stop. For the latter case, it would
	* mean that the node failed even though it has no subnodes.
	*/
	ret = atmel_process_config_dev(dev, config);
	if (!ret)
	return ret;

	/*
	* If we reach here, it means that the subnode pinctrl's DT has multiple
	* subnodes. If it does not, then something else went wrong in the
	* previous call to atmel_process_config_dev.
	*/
	fdt_for_each_subnode(subnode, gd->fdt_blob, node) {
	/* Get subnode as an udevice */
	ret = uclass_find_device_by_of_offset(UCLASS_PINCONFIG, subnode,
	&subconfig);
	if (ret)
	return ret;

	/*
	* If this time the function returns an error code on a subnode
	* then something is totally wrong so abort.
	*/
	ret = atmel_process_config_dev(dev, subconfig);
	if (ret)
	return ret;

	subnode_count++;
	}

	/*
	* If we somehow got here and we do not have any subnodes, abort.
	*/
	if (!subnode_count)
	return -EINVAL;

	return 0;
	}

	const struct pinctrl_ops atmel_pinctrl_ops = {
	.set_state = atmel_pinctrl_set_state,
	};

	static int atmel_pinctrl_probe(struct udevice *dev)
	{
	struct atmel_pio4_plat *plat = dev_get_plat(dev);
	struct atmel_pinctrl_data priv = (struct atmel_pinctrl_data )dev_get_driver_data(dev);
	fdt_addr_t addr_base;

	addr_base = dev_read_addr(dev);
	if (addr_base == FDT_ADDR_T_NONE)
	return -EINVAL;

	plat->reg_base = (struct atmel_pio4_port *)addr_base;
	plat->slew_rate_support = priv->slew_rate_support;

	return 0;
	}

	static int atmel_pinctrl_bind(struct udevice *dev)
	{
	struct udevice *g;
	struct driver *drv;
	ofnode node = dev_ofnode(dev);
	struct atmel_pinctrl_data priv = (struct atmel_pinctrl_data )dev_get_driver_data(dev);

	if (!IS_ENABLED(CONFIG_ATMEL_PIO4))
	return 0;

	/* Obtain a handle to the GPIO driver */
	drv = lists_driver_lookup_name("gpio_atmel_pio4");
	if (!drv)
	return -ENOENT;

	/*
	* Bind the GPIO driver to the pinctrl DT node, together
	* with its corresponding driver_data.
	*/
	return device_bind_with_driver_data(dev, drv, drv->name,
	drv->of_match[priv->gdidx].data,
	node, &g);
	}

	static const struct atmel_pinctrl_data atmel_sama5d2_pinctrl_data = {
	.gdidx = 0,
	};

	static const struct atmel_pinctrl_data microchip_sama7g5_pinctrl_data = {
	.slew_rate_support = 1,
	.gdidx = 1,
	};

	static const struct udevice_id atmel_pinctrl_match[] = {
	{ .compatible = "atmel,sama5d2-pinctrl",
	.data = (ulong)&atmel_sama5d2_pinctrl_data, },
	{ .compatible = "microchip,sama7g5-pinctrl",
	.data = (ulong)&microchip_sama7g5_pinctrl_data, },
	{}
	};

	U_BOOT_DRIVER(atmel_pinctrl) = {
	.name = "pinctrl_atmel_pio4",
	.id = UCLASS_PINCTRL,
	.of_match = atmel_pinctrl_match,
	.bind = atmel_pinctrl_bind,
	.probe = atmel_pinctrl_probe,
	.plat_auto = sizeof(struct atmel_pio4_plat),
	.ops = &atmel_pinctrl_ops,
	};