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thermal: imx_thermal: use CPU temperature grade for trip points

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Replace the hard-coded values for min/max/passive with values derived from
the CPU temperature grade.

Signed-off-by: Tim Harvey <tharvey@gateworks.com>
This commit is contained in:
Tim Harvey 2015-05-18 06:56:47 -07:00 committed by Stefano Babic
parent 70caa8e21d
commit a91db95479
1 changed files with 19 additions and 10 deletions
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29
drivers/thermal/imx_thermal.c
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@ -12,15 +12,13 @@
#include <fuse.h>
#include <asm/io.h>
#include <asm/arch/clock.h>
#include <asm/arch/sys_proto.h>
#include <dm.h>
#include <errno.h>
#include <malloc.h>
#include <thermal.h>
#include <imx_thermal.h>
#define TEMPERATURE_MIN -40
#define TEMPERATURE_HOT 80
#define TEMPERATURE_MAX 125
#define FACTOR0 10000000
#define FACTOR1 15976
#define FACTOR2 4297157
@ -34,14 +32,21 @@
#define MISC0_REFTOP_SELBIASOFF (1 << 3)
#define TEMPSENSE1_MEASURE_FREQ 0xffff
struct thermal_data {
unsigned int fuse;
int passive;
int minc;
int maxc;
};
static int read_cpu_temperature(struct udevice *dev)
{
int temperature;
unsigned int reg, n_meas;
const struct imx_thermal_plat *pdata = dev_get_platdata(dev);
struct anatop_regs *anatop = (struct anatop_regs *)pdata->regs;
unsigned int *priv = dev_get_priv(dev);
u32 fuse = *priv;
struct thermal_data *priv = dev_get_priv(dev);
u32 fuse = priv->fuse;
int t1, n1;
u32 c1, c2;
u64 temp64;
@ -119,11 +124,12 @@ static int read_cpu_temperature(struct udevice *dev)
int imx_thermal_get_temp(struct udevice *dev, int *temp)
{
struct thermal_data *priv = dev_get_priv(dev);
int cpu_tmp = 0;
cpu_tmp = read_cpu_temperature(dev);
while (cpu_tmp > TEMPERATURE_MIN && cpu_tmp < TEMPERATURE_MAX) {
if (cpu_tmp >= TEMPERATURE_HOT) {
while (cpu_tmp > priv->minc && cpu_tmp < priv->maxc) {
if (cpu_tmp >= priv->passive) {
printf("CPU Temperature is %d C, too hot to boot, waiting...\n",
cpu_tmp);
udelay(5000000);
@ -147,7 +153,7 @@ static int imx_thermal_probe(struct udevice *dev)
unsigned int fuse = ~0;
const struct imx_thermal_plat *pdata = dev_get_platdata(dev);
unsigned int *priv = dev_get_priv(dev);
struct thermal_data *priv = dev_get_priv(dev);
/* Read Temperature calibration data fuse */
fuse_read(pdata->fuse_bank, pdata->fuse_word, &fuse);
@ -158,7 +164,10 @@ static int imx_thermal_probe(struct udevice *dev)
return -EPERM;
}
*priv = fuse;
/* set passive cooling temp to max - 20C */
get_cpu_temp_grade(&priv->minc, &priv->maxc);
priv->passive = priv->maxc - 20;
priv->fuse = fuse;
enable_thermal_clk();
@ -170,6 +179,6 @@ U_BOOT_DRIVER(imx_thermal) = {
.id = UCLASS_THERMAL,
.ops = &imx_thermal_ops,
.probe = imx_thermal_probe,
.priv_auto_alloc_size = sizeof(unsigned int),
.priv_auto_alloc_size = sizeof(struct thermal_data),
.flags = DM_FLAG_PRE_RELOC,
};