Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 | // SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2015, The Linux Foundation. All rights reserved.
*/
#include <linux/err.h>
#include <linux/io.h>
#include <linux/nvmem-consumer.h>
#include <linux/of_address.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include "tsens.h"
char *qfprom_read(struct device *dev, const char *cname)
{
struct nvmem_cell *cell;
ssize_t data;
char *ret;
cell = nvmem_cell_get(dev, cname);
if (IS_ERR(cell))
return ERR_CAST(cell);
ret = nvmem_cell_read(cell, &data);
nvmem_cell_put(cell);
return ret;
}
/*
* Use this function on devices where slope and offset calculations
* depend on calibration data read from qfprom. On others the slope
* and offset values are derived from tz->tzp->slope and tz->tzp->offset
* resp.
*/
void compute_intercept_slope(struct tsens_priv *priv, u32 *p1,
u32 *p2, u32 mode)
{
int i;
int num, den;
for (i = 0; i < priv->num_sensors; i++) {
dev_dbg(priv->dev,
"sensor%d - data_point1:%#x data_point2:%#x\n",
i, p1[i], p2[i]);
priv->sensor[i].slope = SLOPE_DEFAULT;
if (mode == TWO_PT_CALIB) {
/*
* slope (m) = adc_code2 - adc_code1 (y2 - y1)/
* temp_120_degc - temp_30_degc (x2 - x1)
*/
num = p2[i] - p1[i];
num *= SLOPE_FACTOR;
den = CAL_DEGC_PT2 - CAL_DEGC_PT1;
priv->sensor[i].slope = num / den;
}
priv->sensor[i].offset = (p1[i] * SLOPE_FACTOR) -
(CAL_DEGC_PT1 *
priv->sensor[i].slope);
dev_dbg(priv->dev, "offset:%d\n", priv->sensor[i].offset);
}
}
static inline int code_to_degc(u32 adc_code, const struct tsens_sensor *s)
{
int degc, num, den;
num = (adc_code * SLOPE_FACTOR) - s->offset;
den = s->slope;
if (num > 0)
degc = num + (den / 2);
else if (num < 0)
degc = num - (den / 2);
else
degc = num;
degc /= den;
return degc;
}
int get_temp_tsens_valid(struct tsens_priv *priv, int i, int *temp)
{
struct tsens_sensor *s = &priv->sensor[i];
u32 temp_idx = LAST_TEMP_0 + s->hw_id;
u32 valid_idx = VALID_0 + s->hw_id;
u32 last_temp = 0, valid, mask;
int ret;
ret = regmap_field_read(priv->rf[valid_idx], &valid);
if (ret)
return ret;
while (!valid) {
/* Valid bit is 0 for 6 AHB clock cycles.
* At 19.2MHz, 1 AHB clock is ~60ns.
* We should enter this loop very, very rarely.
*/
ndelay(400);
ret = regmap_field_read(priv->rf[valid_idx], &valid);
if (ret)
return ret;
}
/* Valid bit is set, OK to read the temperature */
ret = regmap_field_read(priv->rf[temp_idx], &last_temp);
if (ret)
return ret;
if (priv->feat->adc) {
/* Convert temperature from ADC code to milliCelsius */
*temp = code_to_degc(last_temp, s) * 1000;
} else {
mask = GENMASK(priv->fields[LAST_TEMP_0].msb,
priv->fields[LAST_TEMP_0].lsb);
/* Convert temperature from deciCelsius to milliCelsius */
*temp = sign_extend32(last_temp, fls(mask) - 1) * 100;
}
return 0;
}
int get_temp_common(struct tsens_priv *priv, int i, int *temp)
{
struct tsens_sensor *s = &priv->sensor[i];
int last_temp = 0, ret;
ret = regmap_field_read(priv->rf[LAST_TEMP_0 + s->hw_id], &last_temp);
if (ret)
return ret;
*temp = code_to_degc(last_temp, s) * 1000;
return 0;
}
static const struct regmap_config tsens_config = {
.name = "tm",
.reg_bits = 32,
.val_bits = 32,
.reg_stride = 4,
};
static const struct regmap_config tsens_srot_config = {
.name = "srot",
.reg_bits = 32,
.val_bits = 32,
.reg_stride = 4,
};
int __init init_common(struct tsens_priv *priv)
{
void __iomem *tm_base, *srot_base;
struct device *dev = priv->dev;
struct resource *res;
u32 enabled;
int ret, i, j;
struct platform_device *op = of_find_device_by_node(priv->dev->of_node);
if (!op)
return -EINVAL;
if (op->num_resources > 1) {
/* DT with separate SROT and TM address space */
priv->tm_offset = 0;
res = platform_get_resource(op, IORESOURCE_MEM, 1);
srot_base = devm_ioremap_resource(&op->dev, res);
if (IS_ERR(srot_base)) {
ret = PTR_ERR(srot_base);
goto err_put_device;
}
priv->srot_map = devm_regmap_init_mmio(dev, srot_base,
&tsens_srot_config);
if (IS_ERR(priv->srot_map)) {
ret = PTR_ERR(priv->srot_map);
goto err_put_device;
}
} else {
/* old DTs where SROT and TM were in a contiguous 2K block */
priv->tm_offset = 0x1000;
}
res = platform_get_resource(op, IORESOURCE_MEM, 0);
tm_base = devm_ioremap_resource(&op->dev, res);
if (IS_ERR(tm_base)) {
ret = PTR_ERR(tm_base);
goto err_put_device;
}
priv->tm_map = devm_regmap_init_mmio(dev, tm_base, &tsens_config);
if (IS_ERR(priv->tm_map)) {
ret = PTR_ERR(priv->tm_map);
goto err_put_device;
}
priv->rf[TSENS_EN] = devm_regmap_field_alloc(dev, priv->srot_map,
priv->fields[TSENS_EN]);
if (IS_ERR(priv->rf[TSENS_EN])) {
ret = PTR_ERR(priv->rf[TSENS_EN]);
goto err_put_device;
}
ret = regmap_field_read(priv->rf[TSENS_EN], &enabled);
if (ret)
goto err_put_device;
if (!enabled) {
dev_err(dev, "tsens device is not enabled\n");
ret = -ENODEV;
goto err_put_device;
}
priv->rf[SENSOR_EN] = devm_regmap_field_alloc(dev, priv->srot_map,
priv->fields[SENSOR_EN]);
if (IS_ERR(priv->rf[SENSOR_EN])) {
ret = PTR_ERR(priv->rf[SENSOR_EN]);
goto err_put_device;
}
/* now alloc regmap_fields in tm_map */
for (i = 0, j = LAST_TEMP_0; i < priv->feat->max_sensors; i++, j++) {
priv->rf[j] = devm_regmap_field_alloc(dev, priv->tm_map,
priv->fields[j]);
if (IS_ERR(priv->rf[j])) {
ret = PTR_ERR(priv->rf[j]);
goto err_put_device;
}
}
for (i = 0, j = VALID_0; i < priv->feat->max_sensors; i++, j++) {
priv->rf[j] = devm_regmap_field_alloc(dev, priv->tm_map,
priv->fields[j]);
if (IS_ERR(priv->rf[j])) {
ret = PTR_ERR(priv->rf[j]);
goto err_put_device;
}
}
return 0;
err_put_device:
put_device(&op->dev);
return ret;
}
|