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linux-next/drivers/clk/tegra/cvb.c
Joseph Lo b3cf8d0695 clk: tegra: dfll: CVB calculation alignment with the regulator
The CVB table contains calibration data for the CPU DFLL based on
process characterization. The regulator step and offset parameters depend
on the regulator supplying vdd-cpu, not on the specific Tegra SKU.

When using a PWM controlled regulator, the voltage step and offset are
determined by the regulator type in use. This is specified in DT. When
using an I2C controlled regulator, we can retrieve them from CPU regulator
Then pass this information to the CVB table calculation function.

Based on the work done of "Peter De Schrijver <pdeschrijver@nvidia.com>"
and "Alex Frid <afrid@nvidia.com>".

Signed-off-by: Joseph Lo <josephl@nvidia.com>
Acked-by: Jon Hunter <jonathanh@nvidia.com>
Acked-by: Stephen Boyd <sboyd@kernel.org>
Signed-off-by: Thierry Reding <treding@nvidia.com>
2019-02-06 14:28:41 +01:00

151 lines
4.2 KiB
C

/*
* Utility functions for parsing Tegra CVB voltage tables
*
* Copyright (C) 2012-2019 NVIDIA Corporation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
*/
#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/pm_opp.h>
#include "cvb.h"
/* cvb_mv = ((c2 * speedo / s_scale + c1) * speedo / s_scale + c0) */
static inline int get_cvb_voltage(int speedo, int s_scale,
const struct cvb_coefficients *cvb)
{
int mv;
/* apply only speedo scale: output mv = cvb_mv * v_scale */
mv = DIV_ROUND_CLOSEST(cvb->c2 * speedo, s_scale);
mv = DIV_ROUND_CLOSEST((mv + cvb->c1) * speedo, s_scale) + cvb->c0;
return mv;
}
static int round_cvb_voltage(int mv, int v_scale,
const struct rail_alignment *align)
{
/* combined: apply voltage scale and round to cvb alignment step */
int uv;
int step = (align->step_uv ? : 1000) * v_scale;
int offset = align->offset_uv * v_scale;
uv = max(mv * 1000, offset) - offset;
uv = DIV_ROUND_UP(uv, step) * align->step_uv + align->offset_uv;
return uv / 1000;
}
enum {
DOWN,
UP
};
static int round_voltage(int mv, const struct rail_alignment *align, int up)
{
if (align->step_uv) {
int uv;
uv = max(mv * 1000, align->offset_uv) - align->offset_uv;
uv = (uv + (up ? align->step_uv - 1 : 0)) / align->step_uv;
return (uv * align->step_uv + align->offset_uv) / 1000;
}
return mv;
}
static int build_opp_table(struct device *dev, const struct cvb_table *table,
struct rail_alignment *align,
int speedo_value, unsigned long max_freq)
{
int i, ret, dfll_mv, min_mv, max_mv;
min_mv = round_voltage(table->min_millivolts, align, UP);
max_mv = round_voltage(table->max_millivolts, align, DOWN);
for (i = 0; i < MAX_DVFS_FREQS; i++) {
const struct cvb_table_freq_entry *entry = &table->entries[i];
if (!entry->freq || (entry->freq > max_freq))
break;
dfll_mv = get_cvb_voltage(speedo_value, table->speedo_scale,
&entry->coefficients);
dfll_mv = round_cvb_voltage(dfll_mv, table->voltage_scale,
align);
dfll_mv = clamp(dfll_mv, min_mv, max_mv);
ret = dev_pm_opp_add(dev, entry->freq, dfll_mv * 1000);
if (ret)
return ret;
}
return 0;
}
/**
* tegra_cvb_add_opp_table - build OPP table from Tegra CVB tables
* @dev: the struct device * for which the OPP table is built
* @tables: array of CVB tables
* @count: size of the previously mentioned array
* @process_id: process id of the HW module
* @speedo_id: speedo id of the HW module
* @speedo_value: speedo value of the HW module
* @max_freq: highest safe clock rate
*
* On Tegra, a CVB table encodes the relationship between operating voltage
* and safe maximal frequency for a given module (e.g. GPU or CPU). This
* function calculates the optimal voltage-frequency operating points
* for the given arguments and exports them via the OPP library for the
* given @dev. Returns a pointer to the struct cvb_table that matched
* or an ERR_PTR on failure.
*/
const struct cvb_table *
tegra_cvb_add_opp_table(struct device *dev, const struct cvb_table *tables,
size_t count, struct rail_alignment *align,
int process_id, int speedo_id, int speedo_value,
unsigned long max_freq)
{
size_t i;
int ret;
for (i = 0; i < count; i++) {
const struct cvb_table *table = &tables[i];
if (table->speedo_id != -1 && table->speedo_id != speedo_id)
continue;
if (table->process_id != -1 && table->process_id != process_id)
continue;
ret = build_opp_table(dev, table, align, speedo_value,
max_freq);
return ret ? ERR_PTR(ret) : table;
}
return ERR_PTR(-EINVAL);
}
void tegra_cvb_remove_opp_table(struct device *dev,
const struct cvb_table *table,
unsigned long max_freq)
{
unsigned int i;
for (i = 0; i < MAX_DVFS_FREQS; i++) {
const struct cvb_table_freq_entry *entry = &table->entries[i];
if (!entry->freq || (entry->freq > max_freq))
break;
dev_pm_opp_remove(dev, entry->freq);
}
}