Add a new thermal uclass for thermal sensor and implement the imx thermal driver basing on this uclass. Signed-off-by: Ye.Li <B37916@freescale.com> Acked-by: Stefano Babic <sbabic@denx.de>master
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#
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# (C) Copyright 2014 Freescale Semiconductor, Inc.
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# Author: Nitin Garg <nitin.garg@freescale.com>
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#
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# SPDX-License-Identifier: GPL-2.0+
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#
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obj-$(CONFIG_DM_THERMAL) += thermal-uclass.o
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obj-$(CONFIG_IMX6_THERMAL) += imx_thermal.o
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/*
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* (C) Copyright 2014 Freescale Semiconductor, Inc. |
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* Author: Nitin Garg <nitin.garg@freescale.com> |
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* Ye Li <Ye.Li@freescale.com> |
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* |
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* SPDX-License-Identifier: GPL-2.0+ |
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*/ |
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#include <config.h> |
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#include <common.h> |
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#include <div64.h> |
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#include <fuse.h> |
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#include <asm/io.h> |
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#include <asm/arch/clock.h> |
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#include <dm.h> |
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#include <errno.h> |
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#include <malloc.h> |
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#include <thermal.h> |
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#include <imx_thermal.h> |
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#define TEMPERATURE_MIN -40 |
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#define TEMPERATURE_HOT 80 |
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#define TEMPERATURE_MAX 125 |
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#define FACTOR0 10000000 |
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#define FACTOR1 15976 |
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#define FACTOR2 4297157 |
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#define MEASURE_FREQ 327 |
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#define TEMPSENSE0_TEMP_CNT_SHIFT 8 |
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#define TEMPSENSE0_TEMP_CNT_MASK (0xfff << TEMPSENSE0_TEMP_CNT_SHIFT) |
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#define TEMPSENSE0_FINISHED (1 << 2) |
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#define TEMPSENSE0_MEASURE_TEMP (1 << 1) |
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#define TEMPSENSE0_POWER_DOWN (1 << 0) |
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#define MISC0_REFTOP_SELBIASOFF (1 << 3) |
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#define TEMPSENSE1_MEASURE_FREQ 0xffff |
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static int read_cpu_temperature(struct udevice *dev) |
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{ |
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int temperature; |
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unsigned int reg, n_meas; |
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const struct imx_thermal_plat *pdata = dev_get_platdata(dev); |
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struct anatop_regs *anatop = (struct anatop_regs *)pdata->regs; |
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unsigned int *priv = dev_get_priv(dev); |
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u32 fuse = *priv; |
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int t1, n1; |
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u32 c1, c2; |
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u64 temp64; |
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/*
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* Sensor data layout: |
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* [31:20] - sensor value @ 25C |
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* We use universal formula now and only need sensor value @ 25C |
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* slope = 0.4297157 - (0.0015976 * 25C fuse) |
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*/ |
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n1 = fuse >> 20; |
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t1 = 25; /* t1 always 25C */ |
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/*
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* Derived from linear interpolation: |
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* slope = 0.4297157 - (0.0015976 * 25C fuse) |
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* slope = (FACTOR2 - FACTOR1 * n1) / FACTOR0 |
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* (Nmeas - n1) / (Tmeas - t1) = slope |
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* We want to reduce this down to the minimum computation necessary |
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* for each temperature read. Also, we want Tmeas in millicelsius |
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* and we don't want to lose precision from integer division. So... |
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* Tmeas = (Nmeas - n1) / slope + t1 |
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* milli_Tmeas = 1000 * (Nmeas - n1) / slope + 1000 * t1 |
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* milli_Tmeas = -1000 * (n1 - Nmeas) / slope + 1000 * t1 |
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* Let constant c1 = (-1000 / slope) |
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* milli_Tmeas = (n1 - Nmeas) * c1 + 1000 * t1 |
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* Let constant c2 = n1 *c1 + 1000 * t1 |
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* milli_Tmeas = c2 - Nmeas * c1 |
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*/ |
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temp64 = FACTOR0; |
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temp64 *= 1000; |
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do_div(temp64, FACTOR1 * n1 - FACTOR2); |
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c1 = temp64; |
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c2 = n1 * c1 + 1000 * t1; |
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/*
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* now we only use single measure, every time we read |
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* the temperature, we will power on/down anadig thermal |
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* module |
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*/ |
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writel(TEMPSENSE0_POWER_DOWN, &anatop->tempsense0_clr); |
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writel(MISC0_REFTOP_SELBIASOFF, &anatop->ana_misc0_set); |
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/* setup measure freq */ |
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reg = readl(&anatop->tempsense1); |
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reg &= ~TEMPSENSE1_MEASURE_FREQ; |
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reg |= MEASURE_FREQ; |
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writel(reg, &anatop->tempsense1); |
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/* start the measurement process */ |
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writel(TEMPSENSE0_MEASURE_TEMP, &anatop->tempsense0_clr); |
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writel(TEMPSENSE0_FINISHED, &anatop->tempsense0_clr); |
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writel(TEMPSENSE0_MEASURE_TEMP, &anatop->tempsense0_set); |
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/* make sure that the latest temp is valid */ |
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while ((readl(&anatop->tempsense0) & |
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TEMPSENSE0_FINISHED) == 0) |
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udelay(10000); |
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/* read temperature count */ |
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reg = readl(&anatop->tempsense0); |
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n_meas = (reg & TEMPSENSE0_TEMP_CNT_MASK) |
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>> TEMPSENSE0_TEMP_CNT_SHIFT; |
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writel(TEMPSENSE0_FINISHED, &anatop->tempsense0_clr); |
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/* milli_Tmeas = c2 - Nmeas * c1 */ |
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temperature = (c2 - n_meas * c1)/1000; |
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/* power down anatop thermal sensor */ |
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writel(TEMPSENSE0_POWER_DOWN, &anatop->tempsense0_set); |
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writel(MISC0_REFTOP_SELBIASOFF, &anatop->ana_misc0_clr); |
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return temperature; |
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} |
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int imx_thermal_get_temp(struct udevice *dev, int *temp) |
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{ |
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int cpu_tmp = 0; |
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cpu_tmp = read_cpu_temperature(dev); |
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while (cpu_tmp > TEMPERATURE_MIN && cpu_tmp < TEMPERATURE_MAX) { |
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if (cpu_tmp >= TEMPERATURE_HOT) { |
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printf("CPU Temperature is %d C, too hot to boot, waiting...\n", |
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cpu_tmp); |
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udelay(5000000); |
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cpu_tmp = read_cpu_temperature(dev); |
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} else { |
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break; |
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} |
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} |
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*temp = cpu_tmp; |
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return 0; |
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} |
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static const struct dm_thermal_ops imx_thermal_ops = { |
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.get_temp = imx_thermal_get_temp, |
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}; |
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static int imx_thermal_probe(struct udevice *dev) |
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{ |
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unsigned int fuse = ~0; |
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const struct imx_thermal_plat *pdata = dev_get_platdata(dev); |
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unsigned int *priv = dev_get_priv(dev); |
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/* Read Temperature calibration data fuse */ |
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fuse_read(pdata->fuse_bank, pdata->fuse_word, &fuse); |
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/* Check for valid fuse */ |
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if (fuse == 0 || fuse == ~0) { |
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printf("CPU: Thermal invalid data, fuse: 0x%x\n", fuse); |
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return -EPERM; |
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} else { |
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printf("CPU: Thermal calibration data: 0x%x\n", fuse); |
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} |
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*priv = fuse; |
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enable_thermal_clk(); |
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return 0; |
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} |
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U_BOOT_DRIVER(imx_thermal) = { |
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.name = "imx_thermal", |
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.id = UCLASS_THERMAL, |
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.ops = &imx_thermal_ops, |
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.probe = imx_thermal_probe, |
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.priv_auto_alloc_size = sizeof(unsigned int), |
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.flags = DM_FLAG_PRE_RELOC, |
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}; |
@ -0,0 +1,30 @@ |
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/*
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* (C) Copyright 2014 Freescale Semiconductor, Inc |
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* |
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* SPDX-License-Identifier: GPL-2.0+ |
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*/ |
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#include <common.h> |
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#include <dm.h> |
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#include <thermal.h> |
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#include <errno.h> |
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#include <fdtdec.h> |
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#include <malloc.h> |
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#include <asm/io.h> |
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#include <linux/list.h> |
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int thermal_get_temp(struct udevice *dev, int *temp) |
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{ |
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const struct dm_thermal_ops *ops = device_get_ops(dev); |
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if (!ops->get_temp) |
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return -ENOSYS; |
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return ops->get_temp(dev, temp); |
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} |
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UCLASS_DRIVER(thermal) = { |
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.id = UCLASS_THERMAL, |
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.name = "thermal", |
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}; |
@ -0,0 +1,17 @@ |
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/*
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* |
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* (C) Copyright 2014 Freescale Semiconductor, Inc |
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* |
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* SPDX-License-Identifier: GPL-2.0+ |
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*/ |
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#ifndef _IMX_THERMAL_H_ |
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#define _IMX_THERMAL_H_ |
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struct imx_thermal_plat { |
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void *regs; |
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int fuse_bank; |
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int fuse_word; |
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}; |
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#endif /* _IMX_THERMAL_H_ */ |
@ -0,0 +1,42 @@ |
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/*
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* |
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* (C) Copyright 2014 Freescale Semiconductor, Inc |
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* |
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* SPDX-License-Identifier: GPL-2.0+ |
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*/ |
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#ifndef _THERMAL_H_ |
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#define _THERMAL_H_ |
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#include <dm.h> |
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int thermal_get_temp(struct udevice *dev, int *temp); |
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/**
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* struct struct dm_thermal_ops - Driver model Thermal operations |
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* |
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* The uclass interface is implemented by all Thermal devices which use |
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* driver model. |
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*/ |
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struct dm_thermal_ops { |
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/**
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* Get the current temperature |
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* |
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* The device provided is the slave device. It's parent controller |
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* will be used to provide the communication. |
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* |
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* This must be called before doing any transfers with a Thermal slave. |
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* It will enable and initialize any Thermal hardware as necessary, |
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* and make sure that the SCK line is in the correct idle state. It is |
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* not allowed to claim the same bus for several slaves without |
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* releasing the bus in between. |
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* |
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* @dev: The Thermal device |
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* |
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* Returns: 0 if the bus was claimed successfully, or a negative value |
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* if it wasn't. |
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*/ |
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int (*get_temp)(struct udevice *dev, int *temp); |
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}; |
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#endif /* _THERMAL_H_ */ |
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