[U-Boot] [PATCH v7 2/4] DM: thermal: Add imx thermal DM driver
Stefano Babic
sbabic at denx.de
Thu Nov 20 16:35:13 CET 2014
Hi Ye,
On 20/11/2014 14:14, Ye.Li wrote:
> Add a new thermal uclass for thermal sensor and implement the imx
> thermal driver basing on this uclass.
Thanks for doing this !
>
> Signed-off-by: Ye.Li <B37916 at freescale.com>
> ---
> drivers/Makefile | 1 +
> drivers/thermal/Makefile | 9 ++
> drivers/thermal/imx_thermal.c | 177 ++++++++++++++++++++++++++++++++++++++
> drivers/thermal/thermal-uclass.c | 30 +++++++
> include/dm/uclass-id.h | 1 +
> include/imx_thermal.h | 17 ++++
> include/thermal.h | 42 +++++++++
> 7 files changed, 277 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/Makefile b/drivers/Makefile
> index 33227c8..7683c61 100644
> --- a/drivers/Makefile
> +++ b/drivers/Makefile
> @@ -21,3 +21,4 @@ obj-y += pwm/
> obj-y += input/
> # SOC specific infrastructure drivers.
> obj-y += soc/
> +obj-y += thermal/
> diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile
> new file mode 100644
> index 0000000..6d4cacd
> --- /dev/null
> +++ b/drivers/thermal/Makefile
> @@ -0,0 +1,9 @@
> +#
> +# (C) Copyright 2014 Freescale Semiconductor, Inc.
> +# Author: Nitin Garg <nitin.garg at freescale.com>
> +#
> +# SPDX-License-Identifier: GPL-2.0+
> +#
> +
> +obj-$(CONFIG_DM_THERMAL) += thermal-uclass.o
> +obj-$(CONFIG_IMX6_THERMAL) += imx_thermal.o
> diff --git a/drivers/thermal/imx_thermal.c b/drivers/thermal/imx_thermal.c
> new file mode 100644
> index 0000000..1161585
> --- /dev/null
> +++ b/drivers/thermal/imx_thermal.c
> @@ -0,0 +1,177 @@
> +/*
> + * (C) Copyright 2014 Freescale Semiconductor, Inc.
> + * Author: Nitin Garg <nitin.garg at freescale.com>
> + * Ye Li <Ye.Li at freescale.com>
> + *
> + * SPDX-License-Identifier: GPL-2.0+
> + */
> +
> +#include <config.h>
> +#include <common.h>
> +#include <div64.h>
> +#include <fuse.h>
> +#include <asm/io.h>
> +#include <asm/arch/clock.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
> +#define MEASURE_FREQ 327
> +
> +#define TEMPSENSE0_TEMP_CNT_SHIFT 8
> +#define TEMPSENSE0_TEMP_CNT_MASK (0xfff << TEMPSENSE0_TEMP_CNT_SHIFT)
> +#define TEMPSENSE0_FINISHED (1 << 2)
> +#define TEMPSENSE0_MEASURE_TEMP (1 << 1)
> +#define TEMPSENSE0_POWER_DOWN (1 << 0)
> +#define MISC0_REFTOP_SELBIASOFF (1 << 3)
> +#define TEMPSENSE1_MEASURE_FREQ 0xffff
> +
> +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;
> + int t1, n1;
> + u32 c1, c2;
> + u64 temp64;
> +
> + /*
> + * Sensor data layout:
> + * [31:20] - sensor value @ 25C
> + * We use universal formula now and only need sensor value @ 25C
> + * slope = 0.4297157 - (0.0015976 * 25C fuse)
> + */
> + n1 = fuse >> 20;
> + t1 = 25; /* t1 always 25C */
> +
> + /*
> + * Derived from linear interpolation:
> + * slope = 0.4297157 - (0.0015976 * 25C fuse)
> + * slope = (FACTOR2 - FACTOR1 * n1) / FACTOR0
> + * (Nmeas - n1) / (Tmeas - t1) = slope
> + * We want to reduce this down to the minimum computation necessary
> + * for each temperature read. Also, we want Tmeas in millicelsius
> + * and we don't want to lose precision from integer division. So...
> + * Tmeas = (Nmeas - n1) / slope + t1
> + * milli_Tmeas = 1000 * (Nmeas - n1) / slope + 1000 * t1
> + * milli_Tmeas = -1000 * (n1 - Nmeas) / slope + 1000 * t1
> + * Let constant c1 = (-1000 / slope)
> + * milli_Tmeas = (n1 - Nmeas) * c1 + 1000 * t1
> + * Let constant c2 = n1 *c1 + 1000 * t1
> + * milli_Tmeas = c2 - Nmeas * c1
> + */
> + temp64 = FACTOR0;
> + temp64 *= 1000;
> + do_div(temp64, FACTOR1 * n1 - FACTOR2);
> + c1 = temp64;
> + c2 = n1 * c1 + 1000 * t1;
> +
> + /*
> + * now we only use single measure, every time we read
> + * the temperature, we will power on/down anadig thermal
> + * module
> + */
> + writel(TEMPSENSE0_POWER_DOWN, &anatop->tempsense0_clr);
> + writel(MISC0_REFTOP_SELBIASOFF, &anatop->ana_misc0_set);
> +
> + /* setup measure freq */
> + reg = readl(&anatop->tempsense1);
> + reg &= ~TEMPSENSE1_MEASURE_FREQ;
> + reg |= MEASURE_FREQ;
> + writel(reg, &anatop->tempsense1);
> +
> + /* start the measurement process */
> + writel(TEMPSENSE0_MEASURE_TEMP, &anatop->tempsense0_clr);
> + writel(TEMPSENSE0_FINISHED, &anatop->tempsense0_clr);
> + writel(TEMPSENSE0_MEASURE_TEMP, &anatop->tempsense0_set);
> +
> + /* make sure that the latest temp is valid */
> + while ((readl(&anatop->tempsense0) &
> + TEMPSENSE0_FINISHED) == 0)
> + udelay(10000);
> +
> + /* read temperature count */
> + reg = readl(&anatop->tempsense0);
> + n_meas = (reg & TEMPSENSE0_TEMP_CNT_MASK)
> + >> TEMPSENSE0_TEMP_CNT_SHIFT;
> + writel(TEMPSENSE0_FINISHED, &anatop->tempsense0_clr);
> +
> + /* milli_Tmeas = c2 - Nmeas * c1 */
> + temperature = (c2 - n_meas * c1)/1000;
> +
> + /* power down anatop thermal sensor */
> + writel(TEMPSENSE0_POWER_DOWN, &anatop->tempsense0_set);
> + writel(MISC0_REFTOP_SELBIASOFF, &anatop->ana_misc0_clr);
> +
> + return temperature;
> +}
> +
> +int imx_thermal_get_temp(struct udevice *dev, int *temp)
> +{
> + 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);
> + udelay(5000000);
> + cpu_tmp = read_cpu_temperature(dev);
> + } else {
> + break;
> + }
> + }
> +
> + *temp = cpu_tmp;
> +
> + return 0;
> +}
> +
> +static const struct dm_thermal_ops imx_thermal_ops = {
> + .get_temp = imx_thermal_get_temp,
> +};
> +
> +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);
> +
> + /* Read Temperature calibration data fuse */
> + fuse_read(pdata->fuse_bank, pdata->fuse_word, &fuse);
> +
> + /* Check for valid fuse */
> + if (fuse == 0 || fuse == ~0) {
> + printf("CPU: Thermal invalid data, fuse: 0x%x\n", fuse);
> + return -EPERM;
> + } else {
> + printf("CPU: Thermal calibration data: 0x%x\n", fuse);
> + }
> +
> + *priv = fuse;
> +
> + enable_thermal_clk();
> +
> + return 0;
> +}
> +
> +U_BOOT_DRIVER(imx_thermal) = {
> + .name = "imx_thermal",
> + .id = UCLASS_THERMAL,
> + .ops = &imx_thermal_ops,
> + .probe = imx_thermal_probe,
> + .priv_auto_alloc_size = sizeof(unsigned int),
> + .flags = DM_FLAG_PRE_RELOC,
> +};
> diff --git a/drivers/thermal/thermal-uclass.c b/drivers/thermal/thermal-uclass.c
> new file mode 100644
> index 0000000..3bee1a7
> --- /dev/null
> +++ b/drivers/thermal/thermal-uclass.c
> @@ -0,0 +1,30 @@
> +/*
> + * (C) Copyright 2014 Freescale Semiconductor, Inc
> + *
> + * SPDX-License-Identifier: GPL-2.0+
> + */
> +
> +#include <common.h>
> +#include <dm.h>
> +#include <thermal.h>
> +#include <errno.h>
> +#include <fdtdec.h>
> +#include <malloc.h>
> +#include <asm/io.h>
> +#include <linux/list.h>
> +
> +
> +int thermal_get_temp(struct udevice *dev, int *temp)
> +{
> + const struct dm_thermal_ops *ops = device_get_ops(dev);
> +
> + if (!ops->get_temp)
> + return -ENOSYS;
> +
> + return ops->get_temp(dev, temp);
> +}
> +
> +UCLASS_DRIVER(thermal) = {
> + .id = UCLASS_THERMAL,
> + .name = "thermal",
> +};
> diff --git a/include/dm/uclass-id.h b/include/dm/uclass-id.h
> index a8944c9..202f59b 100644
> --- a/include/dm/uclass-id.h
> +++ b/include/dm/uclass-id.h
> @@ -28,6 +28,7 @@ enum uclass_id {
> UCLASS_SPI_GENERIC, /* Generic SPI flash target */
> UCLASS_SPI_FLASH, /* SPI flash */
> UCLASS_CROS_EC, /* Chrome OS EC */
> + UCLASS_THERMAL, /* Thermal sensor */
>
> UCLASS_COUNT,
> UCLASS_INVALID = -1,
> diff --git a/include/imx_thermal.h b/include/imx_thermal.h
> new file mode 100644
> index 0000000..be13652
> --- /dev/null
> +++ b/include/imx_thermal.h
> @@ -0,0 +1,17 @@
> +/*
> + *
> + * (C) Copyright 2014 Freescale Semiconductor, Inc
> + *
> + * SPDX-License-Identifier: GPL-2.0+
> + */
> +
> +#ifndef _IMX_THERMAL_H_
> +#define _IMX_THERMAL_H_
> +
> +struct imx_thermal_plat {
> + void *regs;
> + int fuse_bank;
> + int fuse_word;
> +};
> +
> +#endif /* _IMX_THERMAL_H_ */
> diff --git a/include/thermal.h b/include/thermal.h
> new file mode 100644
> index 0000000..80b549b
> --- /dev/null
> +++ b/include/thermal.h
> @@ -0,0 +1,42 @@
> +/*
> + *
> + * (C) Copyright 2014 Freescale Semiconductor, Inc
> + *
> + * SPDX-License-Identifier: GPL-2.0+
> + */
> +
> +#ifndef _THERMAL_H_
> +#define _THERMAL_H_
> +
> +#include <dm.h>
> +
> +int thermal_get_temp(struct udevice *dev, int *temp);
> +
> +/**
> + * struct struct dm_thermal_ops - Driver model Thermal operations
> + *
> + * The uclass interface is implemented by all Thermal devices which use
> + * driver model.
> + */
> +struct dm_thermal_ops {
> + /**
> + * Get the current temperature
> + *
> + * The device provided is the slave device. It's parent controller
> + * will be used to provide the communication.
> + *
> + * This must be called before doing any transfers with a Thermal slave. It
> + * will enable and initialize any Thermal hardware as necessary, and make
> + * sure that the SCK line is in the correct idle state. It is not
> + * allowed to claim the same bus for several slaves without releasing
> + * the bus in between.
> + *
> + * @dev: The Thermal device
> + *
> + * Returns: 0 if the bus was claimed successfully, or a negative value
> + * if it wasn't.
> + */
> + int (*get_temp)(struct udevice *dev, int *temp);
> +};
> +
> +#endif /* _THERMAL_H_ */
>
Fine with me.
Acked-by: Stefano Babic <sbabic at denx.de>
Best regards,
Stefano Babic
--
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