drivers/misc/k3_avs.c - github/trini/u-boot - Gitiles

 // SPDX-License-Identifier: GPL-2.0+
 /*
  * Texas Instruments' K3 Clas 0 Adaptive Voltage Scaling driver
  *
  * Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com/
  *      Tero Kristo <t-kristo@ti.com>
  *
  */

 #include <common.h>
 #include <dm.h>
 #include <errno.h>
 #include <asm/io.h>
 #include <i2c.h>
 #include <k3-avs.h>
 #include <dm/device_compat.h>
 #include <linux/bitops.h>
 #include <power/regulator.h>

 #define AM6_VTM_DEVINFO(i)	(priv->base + 0x100 + 0x20 * (i))
 #define AM6_VTM_OPPVID_VD(i)	(priv->base + 0x104 + 0x20 * (i))

 #define AM6_VTM_AVS0_SUPPORTED	BIT(12)

 #define AM6_VTM_OPP_SHIFT(opp)	(8 * (opp))
 #define AM6_VTM_OPP_MASK	0xff

 #define VD_FLAG_INIT_DONE	BIT(0)

 struct k3_avs_privdata {
 	void *base;
 	struct vd_config *vd_config;
 };

 struct opp {
 	u32 freq;
 	u32 volt;
 };

 struct vd_data {
 	int id;
 	u8 opp;
 	u8 flags;
 	int dev_id;
 	int clk_id;
 	struct opp opps[NUM_OPPS];
 	struct udevice *supply;
 };

 struct vd_config {
 	struct vd_data *vds;
 	u32 (*efuse_xlate)(struct k3_avs_privdata *priv, int idx, int opp);
 };

 static struct k3_avs_privdata *k3_avs_priv;

 /**
  * am6_efuse_voltage: read efuse voltage from VTM
  * @priv: driver private data
  * @idx: VD to read efuse for
  * @opp: opp id to read
  *
  * Reads efuse value for the specified OPP, and converts the register
  * value to a voltage. Returns the voltage in uV, or 0 if nominal voltage
  * should be used.
  *
  * Efuse val to volt conversion logic:
  *
  * val > 171 volt increments in 20mV steps with base 171 => 1.66V
  * val between 115 to 11 increments in 10mV steps with base 115 => 1.1V
  * val between 15 to 115 increments in 5mV steps with base 15 => .6V
  * val between 1 to 15 increments in 20mv steps with base 0 => .3V
  * val 0 is invalid
  */
 static u32 am6_efuse_xlate(struct k3_avs_privdata *priv, int idx, int opp)
 {
 	u32 val = readl(AM6_VTM_OPPVID_VD(idx));

 	val >>= AM6_VTM_OPP_SHIFT(opp);
 	val &= AM6_VTM_OPP_MASK;

 	if (!val)
 		return 0;

 	if (val > 171)
 		return 1660000 + 20000 * (val - 171);

 	if (val > 115)
 		return 1100000 + 10000 * (val - 115);

 	if (val > 15)
 		return 600000 + 5000 * (val - 15);

 	return 300000 + 20000 * val;
 }

 static int k3_avs_program_voltage(struct k3_avs_privdata *priv,
 				  struct vd_data *vd,
 				  int opp_id)
 {
 	u32 volt = vd->opps[opp_id].volt;
 	struct vd_data *vd2;

 	if (!vd->supply)
 		return -ENODEV;

 	vd->opp = opp_id;
 	vd->flags |= VD_FLAG_INIT_DONE;

 	/* Take care of ganged rails and pick the Max amongst them*/
 	for (vd2 = priv->vd_config->vds; vd2->id >= 0; vd2++) {
 		if (vd == vd2)
 			continue;

 		if (vd2->supply != vd->supply)
 			continue;

 		if (vd2->opps[vd2->opp].volt > volt)
 			volt = vd2->opps[vd2->opp].volt;

 		vd2->flags |= VD_FLAG_INIT_DONE;
 	}

 	return regulator_set_value(vd->supply, volt);
 }

 static struct vd_data *get_vd(struct k3_avs_privdata *priv, int idx)
 {
 	struct vd_data *vd;

 	for (vd = priv->vd_config->vds; vd->id >= 0 && vd->id != idx; vd++)
 		;

 	if (vd->id < 0)
 		return NULL;

 	return vd;
 }

 /**
  * k3_avs_set_opp: Sets the voltage for an arbitrary VD rail
  * @dev: AVS device
  * @vdd_id: voltage domain ID
  * @opp_id: OPP ID
  *
  * Programs the desired OPP value for the defined voltage rail. This
  * should be called from board files if reconfiguration is desired.
  * Returns 0 on success, negative error value on failure.
  */
 int k3_avs_set_opp(struct udevice *dev, int vdd_id, int opp_id)
 {
 	struct k3_avs_privdata *priv = dev_get_priv(dev);
 	struct vd_data *vd;

 	vd = get_vd(priv, vdd_id);
 	if (!vd)
 		return -EINVAL;

 	return k3_avs_program_voltage(priv, vd, opp_id);
 }

 static int match_opp(struct vd_data *vd, u32 freq)
 {
 	struct opp *opp;
 	int opp_id;

 	for (opp_id = 0; opp_id < NUM_OPPS; opp_id++) {
 		opp = &vd->opps[opp_id];
 		if (opp->freq == freq)
 			return opp_id;
 	}

 	printf("No matching OPP found for freq %d.\n", freq);

 	return -EINVAL;
 }

 /**
  * k3_avs_notify_freq: Notify clock rate change towards AVS subsystem
  * @dev_id: Device ID for the clock to be changed
  * @clk_id: Clock ID for the clock to be changed
  * @freq: New frequency for clock
  *
  * Checks if the provided clock is the MPU clock or not, if not, return
  * immediately. If MPU clock is provided, maps the provided MPU frequency
  * towards an MPU OPP, and programs the voltage to the regulator. Return 0
  * on success, negative error value on failure.
  */
 int k3_avs_notify_freq(int dev_id, int clk_id, u32 freq)
 {
 	int opp_id;
 	struct k3_avs_privdata *priv = k3_avs_priv;
 	struct vd_data *vd;

 	/* Driver may not be probed yet */
 	if (!priv)
 		return -EINVAL;

 	for (vd = priv->vd_config->vds; vd->id >= 0; vd++) {
 		if (vd->dev_id != dev_id || vd->clk_id != clk_id)
 			continue;

 		opp_id = match_opp(vd, freq);
 		if (opp_id < 0)
 			return opp_id;

 		vd->opp = opp_id;
 		return k3_avs_program_voltage(priv, vd, opp_id);
 	}

 	return -EINVAL;
 }

 static int k3_avs_configure(struct udevice *dev, struct k3_avs_privdata *priv)
 {
 	struct vd_config *conf;
 	int ret;
 	char pname[20];
 	struct vd_data *vd;

 	conf = (void *)dev_get_driver_data(dev);

 	priv->vd_config = conf;

 	for (vd = conf->vds; vd->id >= 0; vd++) {
 		sprintf(pname, "vdd-supply-%d", vd->id);
 		ret = device_get_supply_regulator(dev, pname, &vd->supply);
 		if (ret)
 			dev_warn(dev, "supply not found for VD%d.\n", vd->id);

 		sprintf(pname, "ti,default-opp-%d", vd->id);
 		ret = dev_read_u32_default(dev, pname, -1);
 		if (ret != -1)
 			vd->opp = ret;
 	}

 	return 0;
 }

 /**
  * k3_avs_probe: parses VD info from VTM, and re-configures the OPP data
  *
  * Parses all VDs on a device calculating the AVS class-0 voltages for them,
  * and updates the vd_data based on this. The vd_data itself shall be used
  * to program the required OPPs later on. Returns 0 on success, negative
  * error value on failure.
  */
 static int k3_avs_probe(struct udevice *dev)
 {
 	int opp_id;
 	u32 volt;
 	struct opp *opp;
 	struct k3_avs_privdata *priv;
 	struct vd_data *vd;
 	int ret;

 	priv = dev_get_priv(dev);

 	k3_avs_priv = priv;

 	ret = k3_avs_configure(dev, priv);
 	if (ret)
 		return ret;

 	priv->base = dev_read_addr_ptr(dev);
 	if (!priv->base)
 		return -ENODEV;

 	for (vd = priv->vd_config->vds; vd->id >= 0; vd++) {
 		if (!(readl(AM6_VTM_DEVINFO(vd->id)) &
 		      AM6_VTM_AVS0_SUPPORTED)) {
 			dev_warn(dev, "AVS-class 0 not supported for VD%d\n",
 				 vd->id);
 			continue;
 		}

 		for (opp_id = 0; opp_id < NUM_OPPS; opp_id++) {
 			opp = &vd->opps[opp_id];

 			if (!opp->freq)
 				continue;

 			volt = priv->vd_config->efuse_xlate(priv, vd->id,
 							    opp_id);
 			if (volt)
 				opp->volt = volt;
 		}
 	}

 	for (vd = priv->vd_config->vds; vd->id >= 0; vd++) {
 		if (vd->flags & VD_FLAG_INIT_DONE)
 			continue;

 		k3_avs_program_voltage(priv, vd, vd->opp);
 	}

 	return 0;
 }

 static struct vd_data am654_vd_data[] = {
 	{
 		.id = AM6_VDD_CORE,
 		.dev_id = 82, /* AM6_DEV_CBASS0 */
 		.clk_id = 0, /* main sysclk0 */
 		.opp = AM6_OPP_NOM,
 		.opps = {
 			[AM6_OPP_NOM] = {
 				.volt = 1000000,
 				.freq = 250000000, /* CBASS0 */
 			},
 		},
 	},
 	{
 		.id = AM6_VDD_MPU0,
 		.dev_id = 202, /* AM6_DEV_COMPUTE_CLUSTER_A53_0 */
 		.clk_id = 0, /* ARM clock */
 		.opp = AM6_OPP_NOM,
 		.opps = {
 			[AM6_OPP_NOM] = {
 				.volt = 1100000,
 				.freq = 800000000,
 			},
 			[AM6_OPP_OD] = {
 				.volt = 1200000,
 				.freq = 1000000000,
 			},
 			[AM6_OPP_TURBO] = {
 				.volt = 1240000,
 				.freq = 1100000000,
 			},
 		},
 	},
 	{
 		.id = AM6_VDD_MPU1,
 		.opp = AM6_OPP_NOM,
 		.dev_id = 204, /* AM6_DEV_COMPUTE_CLUSTER_A53_2 */
 		.clk_id = 0, /* ARM clock */
 		.opps = {
 			[AM6_OPP_NOM] = {
 				.volt = 1100000,
 				.freq = 800000000,
 			},
 			[AM6_OPP_OD] = {
 				.volt = 1200000,
 				.freq = 1000000000,
 			},
 			[AM6_OPP_TURBO] = {
 				.volt = 1240000,
 				.freq = 1100000000,
 			},
 		},
 	},
 	{ .id = -1 },
 };

 static struct vd_data j721e_vd_data[] = {
 	{
 		.id = J721E_VDD_MPU,
 		.opp = AM6_OPP_NOM,
 		.dev_id = 202, /* J721E_DEV_A72SS0_CORE0 */
 		.clk_id = 2, /* ARM clock */
 		.opps = {
 			[AM6_OPP_NOM] = {
 				.volt = 880000, /* TBD in DM */
 				.freq = 2000000000,
 			},
 		},
 	},
 	{ .id = -1 },
 };

 static struct vd_config j721e_vd_config = {
 	.efuse_xlate = am6_efuse_xlate,
 	.vds = j721e_vd_data,
 };

 static struct vd_config am654_vd_config = {
 	.efuse_xlate = am6_efuse_xlate,
 	.vds = am654_vd_data,
 };

 static const struct udevice_id k3_avs_ids[] = {
 	{ .compatible = "ti,am654-avs", .data = (ulong)&am654_vd_config },
 	{ .compatible = "ti,j721e-avs", .data = (ulong)&j721e_vd_config },
 	{ .compatible = "ti,j721e-vtm", .data = (ulong)&j721e_vd_config },
 	{ .compatible = "ti,j7200-vtm", .data = (ulong)&j721e_vd_config },
 	{}
 };

 U_BOOT_DRIVER(k3_avs) = {
 	.name = "k3_avs",
 	.of_match = k3_avs_ids,
 	.id = UCLASS_MISC,
 	.probe = k3_avs_probe,
 	.priv_auto	= sizeof(struct k3_avs_privdata),
 };
	// SPDX-License-Identifier: GPL-2.0+
	/*
	* Texas Instruments' K3 Clas 0 Adaptive Voltage Scaling driver
	*
	* Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com/
	* Tero Kristo <t-kristo@ti.com>
	*
	*/

	#include <common.h>
	#include <dm.h>
	#include <errno.h>
	#include <asm/io.h>
	#include <i2c.h>
	#include <k3-avs.h>
	#include <dm/device_compat.h>
	#include <linux/bitops.h>
	#include <power/regulator.h>

	#define AM6_VTM_DEVINFO(i) (priv->base + 0x100 + 0x20 * (i))
	#define AM6_VTM_OPPVID_VD(i) (priv->base + 0x104 + 0x20 * (i))

	#define AM6_VTM_AVS0_SUPPORTED BIT(12)

	#define AM6_VTM_OPP_SHIFT(opp) (8 * (opp))
	#define AM6_VTM_OPP_MASK 0xff

	#define VD_FLAG_INIT_DONE BIT(0)

	struct k3_avs_privdata {
	void *base;
	struct vd_config *vd_config;
	};

	struct opp {
	u32 freq;
	u32 volt;
	};

	struct vd_data {
	int id;
	u8 opp;
	u8 flags;
	int dev_id;
	int clk_id;
	struct opp opps[NUM_OPPS];
	struct udevice *supply;
	};

	struct vd_config {
	struct vd_data *vds;
	u32 (efuse_xlate)(struct k3_avs_privdata priv, int idx, int opp);
	};

	static struct k3_avs_privdata *k3_avs_priv;

	/**
	* am6_efuse_voltage: read efuse voltage from VTM
	* @priv: driver private data
	* @idx: VD to read efuse for
	* @opp: opp id to read
	*
	* Reads efuse value for the specified OPP, and converts the register
	* value to a voltage. Returns the voltage in uV, or 0 if nominal voltage
	* should be used.
	*
	* Efuse val to volt conversion logic:
	*
	* val > 171 volt increments in 20mV steps with base 171 => 1.66V
	* val between 115 to 11 increments in 10mV steps with base 115 => 1.1V
	* val between 15 to 115 increments in 5mV steps with base 15 => .6V
	* val between 1 to 15 increments in 20mv steps with base 0 => .3V
	* val 0 is invalid
	*/
	static u32 am6_efuse_xlate(struct k3_avs_privdata *priv, int idx, int opp)
	{
	u32 val = readl(AM6_VTM_OPPVID_VD(idx));

	val >>= AM6_VTM_OPP_SHIFT(opp);
	val &= AM6_VTM_OPP_MASK;

	if (!val)
	return 0;

	if (val > 171)
	return 1660000 + 20000 * (val - 171);

	if (val > 115)
	return 1100000 + 10000 * (val - 115);

	if (val > 15)
	return 600000 + 5000 * (val - 15);

	return 300000 + 20000 * val;
	}

	static int k3_avs_program_voltage(struct k3_avs_privdata *priv,
	struct vd_data *vd,
	int opp_id)
	{
	u32 volt = vd->opps[opp_id].volt;
	struct vd_data *vd2;

	if (!vd->supply)
	return -ENODEV;

	vd->opp = opp_id;
	vd->flags \|= VD_FLAG_INIT_DONE;

	/* Take care of ganged rails and pick the Max amongst them*/
	for (vd2 = priv->vd_config->vds; vd2->id >= 0; vd2++) {
	if (vd == vd2)
	continue;

	if (vd2->supply != vd->supply)
	continue;

	if (vd2->opps[vd2->opp].volt > volt)
	volt = vd2->opps[vd2->opp].volt;

	vd2->flags \|= VD_FLAG_INIT_DONE;
	}

	return regulator_set_value(vd->supply, volt);
	}

	static struct vd_data get_vd(struct k3_avs_privdata priv, int idx)
	{
	struct vd_data *vd;

	for (vd = priv->vd_config->vds; vd->id >= 0 && vd->id != idx; vd++)
	;

	if (vd->id < 0)
	return NULL;

	return vd;
	}

	/**
	* k3_avs_set_opp: Sets the voltage for an arbitrary VD rail
	* @dev: AVS device
	* @vdd_id: voltage domain ID
	* @opp_id: OPP ID
	*
	* Programs the desired OPP value for the defined voltage rail. This
	* should be called from board files if reconfiguration is desired.
	* Returns 0 on success, negative error value on failure.
	*/
	int k3_avs_set_opp(struct udevice *dev, int vdd_id, int opp_id)
	{
	struct k3_avs_privdata *priv = dev_get_priv(dev);
	struct vd_data *vd;

	vd = get_vd(priv, vdd_id);
	if (!vd)
	return -EINVAL;

	return k3_avs_program_voltage(priv, vd, opp_id);
	}

	static int match_opp(struct vd_data *vd, u32 freq)
	{
	struct opp *opp;
	int opp_id;

	for (opp_id = 0; opp_id < NUM_OPPS; opp_id++) {
	opp = &vd->opps[opp_id];
	if (opp->freq == freq)
	return opp_id;
	}

	printf("No matching OPP found for freq %d.\n", freq);

	return -EINVAL;
	}

	/**
	* k3_avs_notify_freq: Notify clock rate change towards AVS subsystem
	* @dev_id: Device ID for the clock to be changed
	* @clk_id: Clock ID for the clock to be changed
	* @freq: New frequency for clock
	*
	* Checks if the provided clock is the MPU clock or not, if not, return
	* immediately. If MPU clock is provided, maps the provided MPU frequency
	* towards an MPU OPP, and programs the voltage to the regulator. Return 0
	* on success, negative error value on failure.
	*/
	int k3_avs_notify_freq(int dev_id, int clk_id, u32 freq)
	{
	int opp_id;
	struct k3_avs_privdata *priv = k3_avs_priv;
	struct vd_data *vd;

	/* Driver may not be probed yet */
	if (!priv)
	return -EINVAL;

	for (vd = priv->vd_config->vds; vd->id >= 0; vd++) {
	if (vd->dev_id != dev_id \|\| vd->clk_id != clk_id)
	continue;

	opp_id = match_opp(vd, freq);
	if (opp_id < 0)
	return opp_id;

	vd->opp = opp_id;
	return k3_avs_program_voltage(priv, vd, opp_id);
	}

	return -EINVAL;
	}

	static int k3_avs_configure(struct udevice dev, struct k3_avs_privdata priv)
	{
	struct vd_config *conf;
	int ret;
	char pname[20];
	struct vd_data *vd;

	conf = (void *)dev_get_driver_data(dev);

	priv->vd_config = conf;

	for (vd = conf->vds; vd->id >= 0; vd++) {
	sprintf(pname, "vdd-supply-%d", vd->id);
	ret = device_get_supply_regulator(dev, pname, &vd->supply);
	if (ret)
	dev_warn(dev, "supply not found for VD%d.\n", vd->id);

	sprintf(pname, "ti,default-opp-%d", vd->id);
	ret = dev_read_u32_default(dev, pname, -1);
	if (ret != -1)
	vd->opp = ret;
	}

	return 0;
	}

	/**
	* k3_avs_probe: parses VD info from VTM, and re-configures the OPP data
	*
	* Parses all VDs on a device calculating the AVS class-0 voltages for them,
	* and updates the vd_data based on this. The vd_data itself shall be used
	* to program the required OPPs later on. Returns 0 on success, negative
	* error value on failure.
	*/
	static int k3_avs_probe(struct udevice *dev)
	{
	int opp_id;
	u32 volt;
	struct opp *opp;
	struct k3_avs_privdata *priv;
	struct vd_data *vd;
	int ret;

	priv = dev_get_priv(dev);

	k3_avs_priv = priv;

	ret = k3_avs_configure(dev, priv);
	if (ret)
	return ret;

	priv->base = dev_read_addr_ptr(dev);
	if (!priv->base)
	return -ENODEV;

	for (vd = priv->vd_config->vds; vd->id >= 0; vd++) {
	if (!(readl(AM6_VTM_DEVINFO(vd->id)) &
	AM6_VTM_AVS0_SUPPORTED)) {
	dev_warn(dev, "AVS-class 0 not supported for VD%d\n",
	vd->id);
	continue;
	}

	for (opp_id = 0; opp_id < NUM_OPPS; opp_id++) {
	opp = &vd->opps[opp_id];

	if (!opp->freq)
	continue;

	volt = priv->vd_config->efuse_xlate(priv, vd->id,
	opp_id);
	if (volt)
	opp->volt = volt;
	}
	}

	for (vd = priv->vd_config->vds; vd->id >= 0; vd++) {
	if (vd->flags & VD_FLAG_INIT_DONE)
	continue;

	k3_avs_program_voltage(priv, vd, vd->opp);
	}

	return 0;
	}

	static struct vd_data am654_vd_data[] = {
	{
	.id = AM6_VDD_CORE,
	.dev_id = 82, /* AM6_DEV_CBASS0 */
	.clk_id = 0, /* main sysclk0 */
	.opp = AM6_OPP_NOM,
	.opps = {
	[AM6_OPP_NOM] = {
	.volt = 1000000,
	.freq = 250000000, /* CBASS0 */
	},
	},
	},
	{
	.id = AM6_VDD_MPU0,
	.dev_id = 202, /* AM6_DEV_COMPUTE_CLUSTER_A53_0 */
	.clk_id = 0, /* ARM clock */
	.opp = AM6_OPP_NOM,
	.opps = {
	[AM6_OPP_NOM] = {
	.volt = 1100000,
	.freq = 800000000,
	},
	[AM6_OPP_OD] = {
	.volt = 1200000,
	.freq = 1000000000,
	},
	[AM6_OPP_TURBO] = {
	.volt = 1240000,
	.freq = 1100000000,
	},
	},
	},
	{
	.id = AM6_VDD_MPU1,
	.opp = AM6_OPP_NOM,
	.dev_id = 204, /* AM6_DEV_COMPUTE_CLUSTER_A53_2 */
	.clk_id = 0, /* ARM clock */
	.opps = {
	[AM6_OPP_NOM] = {
	.volt = 1100000,
	.freq = 800000000,
	},
	[AM6_OPP_OD] = {
	.volt = 1200000,
	.freq = 1000000000,
	},
	[AM6_OPP_TURBO] = {
	.volt = 1240000,
	.freq = 1100000000,
	},
	},
	},
	{ .id = -1 },
	};

	static struct vd_data j721e_vd_data[] = {
	{
	.id = J721E_VDD_MPU,
	.opp = AM6_OPP_NOM,
	.dev_id = 202, /* J721E_DEV_A72SS0_CORE0 */
	.clk_id = 2, /* ARM clock */
	.opps = {
	[AM6_OPP_NOM] = {
	.volt = 880000, /* TBD in DM */
	.freq = 2000000000,
	},
	},
	},
	{ .id = -1 },
	};

	static struct vd_config j721e_vd_config = {
	.efuse_xlate = am6_efuse_xlate,
	.vds = j721e_vd_data,
	};

	static struct vd_config am654_vd_config = {
	.efuse_xlate = am6_efuse_xlate,
	.vds = am654_vd_data,
	};

	static const struct udevice_id k3_avs_ids[] = {
	{ .compatible = "ti,am654-avs", .data = (ulong)&am654_vd_config },
	{ .compatible = "ti,j721e-avs", .data = (ulong)&j721e_vd_config },
	{ .compatible = "ti,j721e-vtm", .data = (ulong)&j721e_vd_config },
	{ .compatible = "ti,j7200-vtm", .data = (ulong)&j721e_vd_config },
	{}
	};

	U_BOOT_DRIVER(k3_avs) = {
	.name = "k3_avs",
	.of_match = k3_avs_ids,
	.id = UCLASS_MISC,
	.probe = k3_avs_probe,
	.priv_auto = sizeof(struct k3_avs_privdata),
	};