drivers/misc/rockchip-io-domain.c - u-boot - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 /*
  * Rockchip IO Voltage Domain driver
  *
  * Ported from linux drivers/soc/rockchip/io-domain.c
  */

 #include <dm.h>
 #include <dm/device_compat.h>
 #include <regmap.h>
 #include <syscon.h>
 #include <power/regulator.h>

 #define MAX_SUPPLIES		16

 /*
  * The max voltage for 1.8V and 3.3V come from the Rockchip datasheet under
  * "Recommended Operating Conditions" for "Digital GPIO".   When the typical
  * is 3.3V the max is 3.6V.  When the typical is 1.8V the max is 1.98V.
  *
  * They are used like this:
  * - If the voltage on a rail is above the "1.8" voltage (1.98V) we'll tell the
  *   SoC we're at 3.3.
  * - If the voltage on a rail is above the "3.3" voltage (3.6V) we'll consider
  *   that to be an error.
  */
 #define MAX_VOLTAGE_1_8		1980000
 #define MAX_VOLTAGE_3_3		3600000

 #define RK3328_SOC_CON4			0x410
 #define RK3328_SOC_CON4_VCCIO2		BIT(7)
 #define RK3328_SOC_VCCIO2_SUPPLY_NUM	1

 #define RK3399_PMUGRF_CON0		0x180
 #define RK3399_PMUGRF_CON0_VSEL		BIT(8)
 #define RK3399_PMUGRF_VSEL_SUPPLY_NUM	9

 #define RK3568_PMU_GRF_IO_VSEL0		0x0140
 #define RK3568_PMU_GRF_IO_VSEL1		0x0144
 #define RK3568_PMU_GRF_IO_VSEL2		0x0148

 struct rockchip_iodomain_soc_data {
 	int grf_offset;
 	const char *supply_names[MAX_SUPPLIES];
 	int (*write)(struct regmap *grf, uint offset, int idx, int uV);
 };

 static int rk3568_iodomain_write(struct regmap *grf, uint offset, int idx, int uV)
 {
 	u32 is_3v3 = uV > MAX_VOLTAGE_1_8;
 	u32 val0, val1;
 	int b;

 	switch (idx) {
 	case 0: /* pmuio1 */
 		break;
 	case 1: /* pmuio2 */
 		b = idx;
 		val0 = BIT(16 + b) | (is_3v3 ? 0 : BIT(b));
 		b = idx + 4;
 		val1 = BIT(16 + b) | (is_3v3 ? BIT(b) : 0);

 		regmap_write(grf, RK3568_PMU_GRF_IO_VSEL2, val0);
 		regmap_write(grf, RK3568_PMU_GRF_IO_VSEL2, val1);
 		break;
 	case 3: /* vccio2 */
 		break;
 	case 2: /* vccio1 */
 	case 4: /* vccio3 */
 	case 5: /* vccio4 */
 	case 6: /* vccio5 */
 	case 7: /* vccio6 */
 	case 8: /* vccio7 */
 		b = idx - 1;
 		val0 = BIT(16 + b) | (is_3v3 ? 0 : BIT(b));
 		val1 = BIT(16 + b) | (is_3v3 ? BIT(b) : 0);

 		regmap_write(grf, RK3568_PMU_GRF_IO_VSEL0, val0);
 		regmap_write(grf, RK3568_PMU_GRF_IO_VSEL1, val1);
 		break;
 	default:
 		return -EINVAL;
 	}

 	return 0;
 }

 static int rockchip_iodomain_write(struct regmap *grf, uint offset, int idx, int uV)
 {
 	u32 val;

 	/* set value bit */
 	val = (uV > MAX_VOLTAGE_1_8) ? 0 : 1;
 	val <<= idx;

 	/* apply hiword-mask */
 	val |= (BIT(idx) << 16);

 	return regmap_write(grf, offset, val);
 }

 static int rk3328_iodomain_write(struct regmap *grf, uint offset, int idx, int uV)
 {
 	int ret = rockchip_iodomain_write(grf, offset, idx, uV);

 	if (!ret && idx == RK3328_SOC_VCCIO2_SUPPLY_NUM) {
 		/*
 		 * set vccio2 iodomain to also use this framework
 		 * instead of a special gpio.
 		 */
 		u32 val = RK3328_SOC_CON4_VCCIO2 | (RK3328_SOC_CON4_VCCIO2 << 16);
 		ret = regmap_write(grf, RK3328_SOC_CON4, val);
 	}

 	return ret;
 }

 static int rk3399_pmu_iodomain_write(struct regmap *grf, uint offset, int idx, int uV)
 {
 	int ret = rockchip_iodomain_write(grf, offset, idx, uV);

 	if (!ret && idx == RK3399_PMUGRF_VSEL_SUPPLY_NUM) {
 		/*
 		 * set pmu io iodomain to also use this framework
 		 * instead of a special gpio.
 		 */
 		u32 val = RK3399_PMUGRF_CON0_VSEL | (RK3399_PMUGRF_CON0_VSEL << 16);
 		ret = regmap_write(grf, RK3399_PMUGRF_CON0, val);
 	}

 	return ret;
 }

 static const struct rockchip_iodomain_soc_data soc_data_rk3328 = {
 	.grf_offset = 0x410,
 	.supply_names = {
 		"vccio1-supply",
 		"vccio2-supply",
 		"vccio3-supply",
 		"vccio4-supply",
 		"vccio5-supply",
 		"vccio6-supply",
 		"pmuio-supply",
 	},
 	.write = rk3328_iodomain_write,
 };

 static const struct rockchip_iodomain_soc_data soc_data_rk3399 = {
 	.grf_offset = 0xe640,
 	.supply_names = {
 		"bt656-supply",		/* APIO2_VDD */
 		"audio-supply",		/* APIO5_VDD */
 		"sdmmc-supply",		/* SDMMC0_VDD */
 		"gpio1830-supply",	/* APIO4_VDD */
 	},
 	.write = rockchip_iodomain_write,
 };

 static const struct rockchip_iodomain_soc_data soc_data_rk3399_pmu = {
 	.grf_offset = 0x180,
 	.supply_names = {
 		NULL,
 		NULL,
 		NULL,
 		NULL,
 		NULL,
 		NULL,
 		NULL,
 		NULL,
 		NULL,
 		"pmu1830-supply",	/* PMUIO2_VDD */
 	},
 	.write = rk3399_pmu_iodomain_write,
 };

 static const struct rockchip_iodomain_soc_data soc_data_rk3568_pmu = {
 	.grf_offset = 0x140,
 	.supply_names = {
 		NULL,
 		"pmuio2-supply",
 		"vccio1-supply",
 		NULL,
 		"vccio3-supply",
 		"vccio4-supply",
 		"vccio5-supply",
 		"vccio6-supply",
 		"vccio7-supply",
 	},
 	.write = rk3568_iodomain_write,
 };

 static const struct udevice_id rockchip_iodomain_ids[] = {
 	{
 		.compatible = "rockchip,rk3328-io-voltage-domain",
 		.data = (ulong)&soc_data_rk3328,
 	},
 	{
 		.compatible = "rockchip,rk3399-io-voltage-domain",
 		.data = (ulong)&soc_data_rk3399,
 	},
 	{
 		.compatible = "rockchip,rk3399-pmu-io-voltage-domain",
 		.data = (ulong)&soc_data_rk3399_pmu,
 	},
 	{
 		.compatible = "rockchip,rk3568-pmu-io-voltage-domain",
 		.data = (ulong)&soc_data_rk3568_pmu,
 	},
 	{ }
 };

 static int rockchip_iodomain_bind(struct udevice *dev)
 {
 	/*
 	 * According to the Hardware Design Guide, IO-domain configuration must
 	 * be consistent with the power supply voltage (1.8V or 3.3V).
 	 * Probe after bind to configure IO-domain voltage early during boot.
 	 */
 	dev_or_flags(dev, DM_FLAG_PROBE_AFTER_BIND);

 	return 0;
 }

 static int rockchip_iodomain_probe(struct udevice *dev)
 {
 	struct rockchip_iodomain_soc_data *soc_data =
 		(struct rockchip_iodomain_soc_data *)dev_get_driver_data(dev);
 	struct regmap *grf;
 	int ret;

 	grf = syscon_get_regmap(dev_get_parent(dev));
 	if (IS_ERR(grf))
 		return PTR_ERR(grf);

 	for (int i = 0; i < MAX_SUPPLIES; i++) {
 		const char *supply_name = soc_data->supply_names[i];
 		struct udevice *reg;
 		int uV;

 		if (!supply_name)
 			continue;

 		ret = device_get_supply_regulator(dev, supply_name, &reg);
 		if (ret)
 			continue;

 		ret = regulator_autoset(reg);
 		if (ret && ret != -EALREADY && ret != -EMEDIUMTYPE &&
 		    ret != -ENOSYS)
 			continue;

 		uV = regulator_get_value(reg);
 		if (uV <= 0)
 			continue;

 		if (uV > MAX_VOLTAGE_3_3) {
 			dev_crit(dev, "%s: %d uV is too high. May damage SoC!\n",
 				 supply_name, uV);
 			continue;
 		}

 		ret = soc_data->write(grf, soc_data->grf_offset, i, uV);
 		if (ret)
 			dev_err(dev, "%s: Couldn't write to GRF\n", supply_name);
 	}

 	return 0;
 }

 U_BOOT_DRIVER(rockchip_iodomain) = {
 	.name = "rockchip_iodomain",
 	.id = UCLASS_NOP,
 	.of_match = rockchip_iodomain_ids,
 	.bind = rockchip_iodomain_bind,
 	.probe = rockchip_iodomain_probe,
 };
	// SPDX-License-Identifier: GPL-2.0
	/*
	* Rockchip IO Voltage Domain driver
	*
	* Ported from linux drivers/soc/rockchip/io-domain.c
	*/

	#include <dm.h>
	#include <dm/device_compat.h>
	#include <regmap.h>
	#include <syscon.h>
	#include <power/regulator.h>

	#define MAX_SUPPLIES 16

	/*
	* The max voltage for 1.8V and 3.3V come from the Rockchip datasheet under
	* "Recommended Operating Conditions" for "Digital GPIO". When the typical
	* is 3.3V the max is 3.6V. When the typical is 1.8V the max is 1.98V.
	*
	* They are used like this:
	* - If the voltage on a rail is above the "1.8" voltage (1.98V) we'll tell the
	* SoC we're at 3.3.
	* - If the voltage on a rail is above the "3.3" voltage (3.6V) we'll consider
	* that to be an error.
	*/
	#define MAX_VOLTAGE_1_8 1980000
	#define MAX_VOLTAGE_3_3 3600000

	#define RK3328_SOC_CON4 0x410
	#define RK3328_SOC_CON4_VCCIO2 BIT(7)
	#define RK3328_SOC_VCCIO2_SUPPLY_NUM 1

	#define RK3399_PMUGRF_CON0 0x180
	#define RK3399_PMUGRF_CON0_VSEL BIT(8)
	#define RK3399_PMUGRF_VSEL_SUPPLY_NUM 9

	#define RK3568_PMU_GRF_IO_VSEL0 0x0140
	#define RK3568_PMU_GRF_IO_VSEL1 0x0144
	#define RK3568_PMU_GRF_IO_VSEL2 0x0148

	struct rockchip_iodomain_soc_data {
	int grf_offset;
	const char *supply_names[MAX_SUPPLIES];
	int (write)(struct regmap grf, uint offset, int idx, int uV);
	};

	static int rk3568_iodomain_write(struct regmap *grf, uint offset, int idx, int uV)
	{
	u32 is_3v3 = uV > MAX_VOLTAGE_1_8;
	u32 val0, val1;
	int b;

	switch (idx) {
	case 0: /* pmuio1 */
	break;
	case 1: /* pmuio2 */
	b = idx;
	val0 = BIT(16 + b) \| (is_3v3 ? 0 : BIT(b));
	b = idx + 4;
	val1 = BIT(16 + b) \| (is_3v3 ? BIT(b) : 0);

	regmap_write(grf, RK3568_PMU_GRF_IO_VSEL2, val0);
	regmap_write(grf, RK3568_PMU_GRF_IO_VSEL2, val1);
	break;
	case 3: /* vccio2 */
	break;
	case 2: /* vccio1 */
	case 4: /* vccio3 */
	case 5: /* vccio4 */
	case 6: /* vccio5 */
	case 7: /* vccio6 */
	case 8: /* vccio7 */
	b = idx - 1;
	val0 = BIT(16 + b) \| (is_3v3 ? 0 : BIT(b));
	val1 = BIT(16 + b) \| (is_3v3 ? BIT(b) : 0);

	regmap_write(grf, RK3568_PMU_GRF_IO_VSEL0, val0);
	regmap_write(grf, RK3568_PMU_GRF_IO_VSEL1, val1);
	break;
	default:
	return -EINVAL;
	}

	return 0;
	}

	static int rockchip_iodomain_write(struct regmap *grf, uint offset, int idx, int uV)
	{
	u32 val;

	/* set value bit */
	val = (uV > MAX_VOLTAGE_1_8) ? 0 : 1;
	val <<= idx;

	/* apply hiword-mask */
	val \|= (BIT(idx) << 16);

	return regmap_write(grf, offset, val);
	}

	static int rk3328_iodomain_write(struct regmap *grf, uint offset, int idx, int uV)
	{
	int ret = rockchip_iodomain_write(grf, offset, idx, uV);

	if (!ret && idx == RK3328_SOC_VCCIO2_SUPPLY_NUM) {
	/*
	* set vccio2 iodomain to also use this framework
	* instead of a special gpio.
	*/
	u32 val = RK3328_SOC_CON4_VCCIO2 \| (RK3328_SOC_CON4_VCCIO2 << 16);
	ret = regmap_write(grf, RK3328_SOC_CON4, val);
	}

	return ret;
	}

	static int rk3399_pmu_iodomain_write(struct regmap *grf, uint offset, int idx, int uV)
	{
	int ret = rockchip_iodomain_write(grf, offset, idx, uV);

	if (!ret && idx == RK3399_PMUGRF_VSEL_SUPPLY_NUM) {
	/*
	* set pmu io iodomain to also use this framework
	* instead of a special gpio.
	*/
	u32 val = RK3399_PMUGRF_CON0_VSEL \| (RK3399_PMUGRF_CON0_VSEL << 16);
	ret = regmap_write(grf, RK3399_PMUGRF_CON0, val);
	}

	return ret;
	}

	static const struct rockchip_iodomain_soc_data soc_data_rk3328 = {
	.grf_offset = 0x410,
	.supply_names = {
	"vccio1-supply",
	"vccio2-supply",
	"vccio3-supply",
	"vccio4-supply",
	"vccio5-supply",
	"vccio6-supply",
	"pmuio-supply",
	},
	.write = rk3328_iodomain_write,
	};

	static const struct rockchip_iodomain_soc_data soc_data_rk3399 = {
	.grf_offset = 0xe640,
	.supply_names = {
	"bt656-supply", /* APIO2_VDD */
	"audio-supply", /* APIO5_VDD */
	"sdmmc-supply", /* SDMMC0_VDD */
	"gpio1830-supply", /* APIO4_VDD */
	},
	.write = rockchip_iodomain_write,
	};

	static const struct rockchip_iodomain_soc_data soc_data_rk3399_pmu = {
	.grf_offset = 0x180,
	.supply_names = {
	NULL,
	NULL,
	NULL,
	NULL,
	NULL,
	NULL,
	NULL,
	NULL,
	NULL,
	"pmu1830-supply", /* PMUIO2_VDD */
	},
	.write = rk3399_pmu_iodomain_write,
	};

	static const struct rockchip_iodomain_soc_data soc_data_rk3568_pmu = {
	.grf_offset = 0x140,
	.supply_names = {
	NULL,
	"pmuio2-supply",
	"vccio1-supply",
	NULL,
	"vccio3-supply",
	"vccio4-supply",
	"vccio5-supply",
	"vccio6-supply",
	"vccio7-supply",
	},
	.write = rk3568_iodomain_write,
	};

	static const struct udevice_id rockchip_iodomain_ids[] = {
	{
	.compatible = "rockchip,rk3328-io-voltage-domain",
	.data = (ulong)&soc_data_rk3328,
	},
	{
	.compatible = "rockchip,rk3399-io-voltage-domain",
	.data = (ulong)&soc_data_rk3399,
	},
	{
	.compatible = "rockchip,rk3399-pmu-io-voltage-domain",
	.data = (ulong)&soc_data_rk3399_pmu,
	},
	{
	.compatible = "rockchip,rk3568-pmu-io-voltage-domain",
	.data = (ulong)&soc_data_rk3568_pmu,
	},
	{ }
	};

	static int rockchip_iodomain_bind(struct udevice *dev)
	{
	/*
	* According to the Hardware Design Guide, IO-domain configuration must
	* be consistent with the power supply voltage (1.8V or 3.3V).
	* Probe after bind to configure IO-domain voltage early during boot.
	*/
	dev_or_flags(dev, DM_FLAG_PROBE_AFTER_BIND);

	return 0;
	}

	static int rockchip_iodomain_probe(struct udevice *dev)
	{
	struct rockchip_iodomain_soc_data *soc_data =
	(struct rockchip_iodomain_soc_data *)dev_get_driver_data(dev);
	struct regmap *grf;
	int ret;

	grf = syscon_get_regmap(dev_get_parent(dev));
	if (IS_ERR(grf))
	return PTR_ERR(grf);

	for (int i = 0; i < MAX_SUPPLIES; i++) {
	const char *supply_name = soc_data->supply_names[i];
	struct udevice *reg;
	int uV;

	if (!supply_name)
	continue;

	ret = device_get_supply_regulator(dev, supply_name, &reg);
	if (ret)
	continue;

	ret = regulator_autoset(reg);
	if (ret && ret != -EALREADY && ret != -EMEDIUMTYPE &&
	ret != -ENOSYS)
	continue;

	uV = regulator_get_value(reg);
	if (uV <= 0)
	continue;

	if (uV > MAX_VOLTAGE_3_3) {
	dev_crit(dev, "%s: %d uV is too high. May damage SoC!\n",
	supply_name, uV);
	continue;
	}

	ret = soc_data->write(grf, soc_data->grf_offset, i, uV);
	if (ret)
	dev_err(dev, "%s: Couldn't write to GRF\n", supply_name);
	}

	return 0;
	}

	U_BOOT_DRIVER(rockchip_iodomain) = {
	.name = "rockchip_iodomain",
	.id = UCLASS_NOP,
	.of_match = rockchip_iodomain_ids,
	.bind = rockchip_iodomain_bind,
	.probe = rockchip_iodomain_probe,
	};