regulator: cpr-regulator: fill OPP table with corner to open-loop voltage

				voltages will be used in place of the per-fuse-corner floor voltages defined in the

				qcom,cpr-voltage-floor property.  If this property is not specified, then the

				per-fuse-corner floor voltages will always be used.

- qcom,cpr-voltage-scaling-factor-max: Array of values which define the maximum allowed scaling factor to apply

				when calculating per-corner initial voltage values for each fuse corner.  The

				array must be of length equal to the value of the qcom,cpr-fuse-corners property.

				Each element in the array maps to the fuse corners in increasing order.

				The elements have units of uV/MHz.  Each element corresponds to 'max_factor' in

				the following equation:

				init_voltage_min(f) = fuse_init_voltage(f) - (fuse_f_max - f) * max_factor

				If this property is not specified, then the initial voltage for each virtual

				corner will be set to the initial voltage of the associated fuse corner.

- qcom,cpr-quot-adjust-scaling-factor-max: The maximum allowed CPR target quotient scaling factor to use when

				calculating the quotient adjustment for a given virtual voltage corner. It

				corresponds to 'scaling' in this equation:

#include <linux/of.h>

#include <linux/of_device.h>

#include <linux/platform_device.h>

#include <linux/pm_opp.h>

#include <linux/interrupt.h>

#include <linux/debugfs.h>

#include <linux/uaccess.h>

	int		*fuse_ceiling_volt;

	int		*fuse_floor_volt;

	int		*last_volt;

	int		*open_loop_volt;

	int		step_volt;

	int		*save_ctl;

		cpr_ctl_disable(cpr_vreg);

		new_volt = cpr_vreg->last_volt[corner];

	} else {

		new_volt = cpr_vreg->pvs_corner_v[fuse_corner];

		if (new_volt > cpr_vreg->ceiling_volt[corner])

			new_volt = cpr_vreg->ceiling_volt[corner];

		else if (new_volt < cpr_vreg->floor_volt[corner])

			new_volt = cpr_vreg->floor_volt[corner];

		new_volt = cpr_vreg->open_loop_volt[corner];

	}

	cpr_debug(cpr_vreg, "[corner:%d, fuse_corner:%d] = %d uV\n",

	}

}

/**

 * cpr_get_open_loop_voltage() - fill the open_loop_volt array with linearly

 *				 interpolated open-loop CPR voltage values.

 * @cpr_vreg:	Handle to the cpr-regulator device

 * @dev:	Device pointer for the cpr-regulator device

 * @corner_max:	Array of length (cpr_vreg->num_fuse_corners + 1) which maps from

 *		fuse corners to the highest virtual corner corresponding to a

 *		given fuse corner

 * @freq_map:	Array of length (cpr_vreg->num_corners + 1) which maps from

 *		virtual corners to frequencies in Hz.

 * @maps_valid:	Boolean which indicates if the values in corner_max and freq_map

 *		are valid.  If they are not valid, then the open_loop_volt

 *		values are not interpolated.

 */

static int cpr_get_open_loop_voltage(struct cpr_regulator *cpr_vreg,

		struct device *dev, const u32 *corner_max, const u32 *freq_map,

		bool maps_valid)

{

	int rc = 0;

	int i, j;

	u64 volt_high, volt_low, freq_high, freq_low, freq, temp, temp_limit;

	u32 *max_factor = NULL;

	cpr_vreg->open_loop_volt = devm_kzalloc(dev,

			sizeof(int) * (cpr_vreg->num_corners + 1), GFP_KERNEL);

	if (!cpr_vreg->open_loop_volt) {

		cpr_err(cpr_vreg,

			"Can't allocate memory for cpr_vreg->open_loop_volt\n");

		return -ENOMEM;

	}

	/*

	 * Set open loop voltage to be equal to per-fuse-corner initial voltage

	 * by default.  This ensures that the open loop voltage is valid for

	 * all virtual corners even if some virtual corner to frequency mappings

	 * are missing.  It also ensures that the voltage is valid for the

	 * higher corners not utilized by a given speed-bin.

	 */

	for (i = CPR_CORNER_MIN; i <= cpr_vreg->num_corners; i++)

		cpr_vreg->open_loop_volt[i]

			= cpr_vreg->pvs_corner_v[cpr_vreg->corner_map[i]];

	if (!maps_valid || !corner_max || !freq_map

	    || !of_find_property(dev->of_node,

				 "qcom,cpr-voltage-scaling-factor-max", NULL)) {

		/* Not using interpolation */

		return 0;

	}

	max_factor

	       = kzalloc(sizeof(*max_factor) * (cpr_vreg->num_fuse_corners + 1),

			 GFP_KERNEL);

	if (!max_factor) {

		cpr_err(cpr_vreg, "Could not allocate memory for max_factor array\n");

		return -ENOMEM;

	}

	rc = of_property_read_u32_array(dev->of_node,

			"qcom,cpr-voltage-scaling-factor-max",

			&max_factor[CPR_FUSE_CORNER_MIN],

			cpr_vreg->num_fuse_corners);

	if (rc) {

		cpr_debug(cpr_vreg, "failed to read qcom,cpr-voltage-scaling-factor-max; initial voltage interpolation not possible\n");

		kfree(max_factor);

		return 0;

	}

	for (j = CPR_FUSE_CORNER_MIN + 1; j <= cpr_vreg->num_fuse_corners;

	    j++) {

		freq_high = freq_map[corner_max[j]];

		freq_low = freq_map[corner_max[j - 1]];

		volt_high = cpr_vreg->pvs_corner_v[j];

		volt_low = cpr_vreg->pvs_corner_v[j - 1];

		if (freq_high <= freq_low || volt_high <= volt_low)

			continue;

		for (i = corner_max[j - 1] + 1; i < corner_max[j]; i++) {

			freq = freq_map[i];

			if (freq_high <= freq)

				continue;

			temp = (freq_high - freq) * (volt_high - volt_low);

			do_div(temp, (u32)(freq_high - freq_low));

			/*

			 * max_factor[j] has units of uV/MHz while freq values

			 * have units of Hz.  Divide by 1000000 to convert.

			 */

			temp_limit = (freq_high - freq) * max_factor[j];

			do_div(temp_limit, 1000000);

			cpr_vreg->open_loop_volt[i]

				= volt_high - min(temp, temp_limit);

		}

	}

	kfree(max_factor);

	return 0;

}

/*

 * Limit the per-virtual-corner open-loop voltages using the per-virtual-corner

 * ceiling and floor voltage values.  This must be called only after the

 * open_loop_volt, ceiling, and floor arrays have all been initialized.

 */

static int cpr_limit_open_loop_voltage(struct cpr_regulator *cpr_vreg)

{

	int i;

	for (i = CPR_CORNER_MIN; i <= cpr_vreg->num_corners; i++) {

		if (cpr_vreg->open_loop_volt[i] > cpr_vreg->ceiling_volt[i])

			cpr_vreg->open_loop_volt[i] = cpr_vreg->ceiling_volt[i];

		else if (cpr_vreg->open_loop_volt[i] < cpr_vreg->floor_volt[i])

			cpr_vreg->open_loop_volt[i] = cpr_vreg->floor_volt[i];

	}

	return 0;

}

/*

 * Fill an OPP table for the cpr-regulator device struct with pairs of

 * <virtual voltage corner number, open loop voltage> tuples.

 */

static int cpr_populate_opp_table(struct cpr_regulator *cpr_vreg,

				struct device *dev)

{

	int i, rc;

	for (i = CPR_CORNER_MIN; i <= cpr_vreg->num_corners; i++) {

		rc = dev_pm_opp_add(dev, i, cpr_vreg->open_loop_volt[i]);

		if (rc)

			cpr_err(cpr_vreg, "could not add OPP entry <%d, %d>, rc=%d\n",

				i, cpr_vreg->open_loop_volt[i], rc);

	}

	return 0;

}

/*

 * cpr_get_corner_quot_adjustment() -- get the quot_adjust for each corner.

 *

	u32 scaling, max_factor, corner, freq_corner;

	u32 *freq_max = NULL;

	u32 *corner_max = NULL;

	bool maps_valid = false;

	prop = of_find_property(dev->of_node, "qcom,cpr-corner-map", NULL);

		for (i = CPR_FUSE_CORNER_MIN; i <= cpr_vreg->num_fuse_corners;

		     i++)

			cpr_vreg->corner_map[i] = i;

		return 0;

		goto free_arrays;

	} else {

		rc = of_property_read_u32_array(dev->of_node,

			"qcom,cpr-corner-map", &cpr_vreg->corner_map[1], size);

			"qcom,cpr-speed-bin-max-corners", NULL);

	if (!prop) {

		cpr_debug(cpr_vreg, "qcom,cpr-speed-bin-max-corner missing\n");

		return 0;

		goto free_arrays;

	}

	size = prop->length / sizeof(u32);

			(cpr_vreg->cpr_fuse_target_quot[cpr_vreg->corner_map[i]]

				- cpr_vreg->quot_adjust[i]));

	}

	maps_valid = true;

free_arrays:

	if (!rc) {

		rc = cpr_get_open_loop_voltage(cpr_vreg, dev, corner_max,

						freq_mappings, maps_valid);

		if (rc)

			cpr_err(cpr_vreg, "could not fill open loop voltage array, rc=%d\n",

				rc);

	}

	kfree(freq_mappings);

	kfree(corner_max);

	kfree(freq_max);

	if (!cpr_vreg->last_volt)

		return -EINVAL;

	for (i = 1; i < size; i++) {

		cpr_vreg->last_volt[i] = cpr_vreg->pvs_corner_v

						[cpr_vreg->corner_map[i]];

		/*

		 * Restrict per-virtual-corner initial voltages according to

		 * per-virtual-corner ceiling and floor voltages.  This is

		 * necessary in case per-virtual-corner ceiling or floor values

		 * are more restrictive than the corresponding per-fuse-corner

		 * ceiling or floor values.

		 */

		if (cpr_vreg->last_volt[i] > cpr_vreg->ceiling_volt[i])

			cpr_vreg->last_volt[i] = cpr_vreg->ceiling_volt[i];

		else if (cpr_vreg->last_volt[i] < cpr_vreg->floor_volt[i])

			cpr_vreg->last_volt[i] = cpr_vreg->floor_volt[i];

	}

	for (i = CPR_CORNER_MIN; i <= cpr_vreg->num_corners; i++)

		cpr_vreg->last_volt[i] = cpr_vreg->open_loop_volt[i];

	return 0;

}

	if (rc)

		return rc;

	/*

	 * Limit open loop voltages based upon per corner ceiling and floor

	 * voltages.

	 */

	rc = cpr_limit_open_loop_voltage(cpr_vreg);

	if (rc)

		return rc;

	/*

	 * Fill the OPP table for this device with virtual voltage corner to

	 * open-loop voltage pairs.

	 */

	rc = cpr_populate_opp_table(cpr_vreg, &pdev->dev);

	if (rc)

		return rc;

	/* Init all voltage set points of APC regulator for CPR */

	rc = cpr_init_cpr_voltages(cpr_vreg, &pdev->dev);

	if (rc)