diff options
Diffstat (limited to 'drivers/thermal/imx_thermal.c')
| -rw-r--r-- | drivers/thermal/imx_thermal.c | 36 |
1 files changed, 24 insertions, 12 deletions
diff --git a/drivers/thermal/imx_thermal.c b/drivers/thermal/imx_thermal.c index 0bd9cfd030..0d893c9d06 100644 --- a/drivers/thermal/imx_thermal.c +++ b/drivers/thermal/imx_thermal.c @@ -12,15 +12,15 @@ #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 +/* board will busyloop until this many degrees C below CPU max temperature */ +#define TEMPERATURE_HOT_DELTA 5 /* CPU maxT - 5C */ #define FACTOR0 10000000 #define FACTOR1 15976 #define FACTOR2 4297157 @@ -34,14 +34,21 @@ #define MISC0_REFTOP_SELBIASOFF (1 << 3) #define TEMPSENSE1_MEASURE_FREQ 0xffff +struct thermal_data { + unsigned int fuse; + int critical; + 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; @@ -119,13 +126,15 @@ 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) { - printf("CPU Temperature is %d C, too hot to boot, waiting...\n", - cpu_tmp); + while (cpu_tmp > priv->minc && cpu_tmp < priv->maxc) { + if (cpu_tmp >= priv->critical) { + printf("CPU Temperature (%dC) too close to max (%dC)", + cpu_tmp, priv->maxc); + puts(" waiting...\n"); udelay(5000000); cpu_tmp = read_cpu_temperature(dev); } else { @@ -147,7 +156,7 @@ 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 +167,10 @@ static int imx_thermal_probe(struct udevice *dev) return -EPERM; } - *priv = fuse; + /* set critical cooling temp */ + get_cpu_temp_grade(&priv->minc, &priv->maxc); + priv->critical = priv->maxc - TEMPERATURE_HOT_DELTA; + priv->fuse = fuse; enable_thermal_clk(); @@ -170,6 +182,6 @@ 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, }; |
