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![Simon Glass](/assets/img/avatar_default.png)
Rename this to be consistent with the change from 'platdata'. Signed-off-by: Simon Glass <sjg@chromium.org>
280 lines
7.9 KiB
C
280 lines
7.9 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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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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#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 <log.h>
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#include <asm/io.h>
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#include <asm/arch/clock.h>
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#include <asm/arch/sys_proto.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 <linux/delay.h>
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#include <linux/math64.h>
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#include <thermal.h>
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#include <imx_thermal.h>
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/* board will busyloop until this many degrees C below CPU max temperature */
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#define TEMPERATURE_HOT_DELTA 5 /* CPU maxT - 5C */
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#define FACTOR0 10000000
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#define FACTOR1 15423
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#define FACTOR2 4148468
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#define OFFSET 3580661
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#define MEASURE_FREQ 327
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#define TEMPERATURE_MIN -40
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#define TEMPERATURE_HOT 85
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#define TEMPERATURE_MAX 125
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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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struct thermal_data {
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unsigned int fuse;
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int critical;
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int minc;
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int maxc;
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};
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#if defined(CONFIG_MX6)
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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_plat(dev);
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struct anatop_regs *anatop = (struct anatop_regs *)pdata->regs;
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struct thermal_data *priv = dev_get_priv(dev);
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u32 fuse = priv->fuse;
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int t1, n1;
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s64 c1, c2;
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s64 temp64;
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s32 rem;
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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 = 0.4445388 - (0.0016549 * 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 = 0.4445388 - (0.0016549 * 25C fuse)
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* slope = (FACTOR2 - FACTOR1 * n1) / FACTOR0
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* offset = 3.580661
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* offset = OFFSET / 1000000
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* (Nmeas - n1) / (Tmeas - t1 - offset) = 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 + offset
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* milli_Tmeas = 1000000 * (Nmeas - n1) / slope + 1000000 * t1 + OFFSET
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* milli_Tmeas = -1000000 * (n1 - Nmeas) / slope + 1000000 * t1 + OFFSET
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* Let constant c1 = (-1000000 / slope)
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* milli_Tmeas = (n1 - Nmeas) * c1 + 1000000 * t1 + OFFSET
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* Let constant c2 = n1 *c1 + 1000000 * t1
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* milli_Tmeas = (c2 - Nmeas * c1) + OFFSET
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* Tmeas = ((c2 - Nmeas * c1) + OFFSET) / 1000000
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*/
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temp64 = FACTOR0;
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temp64 *= 1000000;
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temp64 = div_s64_rem(temp64, FACTOR1 * n1 - FACTOR2, &rem);
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c1 = temp64;
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c2 = n1 * c1 + 1000000 * 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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/* Tmeas = (c2 - Nmeas * c1 + OFFSET) / 1000000 */
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temperature = div_s64_rem(c2 - n_meas * c1 + OFFSET, 1000000, &rem);
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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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#elif defined(CONFIG_MX7)
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static int read_cpu_temperature(struct udevice *dev)
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{
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unsigned int reg, tmp;
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unsigned int raw_25c, te1;
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int temperature;
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unsigned int *priv = dev_get_priv(dev);
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u32 fuse = *priv;
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struct mxc_ccm_anatop_reg *ccm_anatop = (struct mxc_ccm_anatop_reg *)
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ANATOP_BASE_ADDR;
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/*
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* fuse data layout:
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* [31:21] sensor value @ 25C
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* [20:18] hot temperature value
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* [17:9] sensor value of room
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* [8:0] sensor value of hot
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*/
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raw_25c = fuse >> 21;
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if (raw_25c == 0)
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raw_25c = 25;
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te1 = (fuse >> 9) & 0x1ff;
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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(TEMPMON_HW_ANADIG_TEMPSENSE1_POWER_DOWN_MASK, &ccm_anatop->tempsense1_clr);
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writel(PMU_REF_REFTOP_SELFBIASOFF_MASK, &ccm_anatop->ref_set);
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/* write measure freq */
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reg = readl(&ccm_anatop->tempsense1);
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reg &= ~TEMPMON_HW_ANADIG_TEMPSENSE1_MEASURE_FREQ_MASK;
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reg |= TEMPMON_HW_ANADIG_TEMPSENSE1_MEASURE_FREQ(MEASURE_FREQ);
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writel(reg, &ccm_anatop->tempsense1);
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writel(TEMPMON_HW_ANADIG_TEMPSENSE1_MEASURE_TEMP_MASK, &ccm_anatop->tempsense1_clr);
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writel(TEMPMON_HW_ANADIG_TEMPSENSE1_FINISHED_MASK, &ccm_anatop->tempsense1_clr);
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writel(TEMPMON_HW_ANADIG_TEMPSENSE1_MEASURE_TEMP_MASK, &ccm_anatop->tempsense1_set);
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if (soc_rev() >= CHIP_REV_1_1) {
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while ((readl(&ccm_anatop->tempsense1) &
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TEMPMON_HW_ANADIG_TEMPSENSE1_FINISHED_MASK) == 0)
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;
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reg = readl(&ccm_anatop->tempsense1);
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tmp = (reg & TEMPMON_HW_ANADIG_TEMPSENSE1_TEMP_VALUE_MASK)
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>> TEMPMON_HW_ANADIG_TEMPSENSE1_TEMP_VALUE_SHIFT;
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} else {
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/*
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* Since we can not rely on finish bit, use 10ms
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* delay to get temperature. From RM, 17us is
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* enough to get data, but to gurantee to get
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* the data, delay 10ms here.
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*/
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udelay(10000);
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reg = readl(&ccm_anatop->tempsense1);
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tmp = (reg & TEMPMON_HW_ANADIG_TEMPSENSE1_TEMP_VALUE_MASK)
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>> TEMPMON_HW_ANADIG_TEMPSENSE1_TEMP_VALUE_SHIFT;
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}
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writel(TEMPMON_HW_ANADIG_TEMPSENSE1_FINISHED_MASK, &ccm_anatop->tempsense1_clr);
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/* power down anatop thermal sensor */
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writel(TEMPMON_HW_ANADIG_TEMPSENSE1_POWER_DOWN_MASK, &ccm_anatop->tempsense1_set);
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writel(PMU_REF_REFTOP_SELFBIASOFF_MASK, &ccm_anatop->ref_clr);
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/* Single point */
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temperature = tmp - (te1 - raw_25c);
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return temperature;
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}
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#endif
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int imx_thermal_get_temp(struct udevice *dev, int *temp)
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{
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struct thermal_data *priv = dev_get_priv(dev);
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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 >= priv->critical) {
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printf("CPU Temperature (%dC) too close to max (%dC)",
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cpu_tmp, priv->maxc);
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puts(" waiting...\n");
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udelay(5000000);
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cpu_tmp = read_cpu_temperature(dev);
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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_plat(dev);
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struct thermal_data *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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if (is_soc_type(MXC_SOC_MX6)) {
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/* Check for valid fuse */
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if (fuse == 0 || fuse == ~0) {
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debug("CPU: Thermal invalid data, fuse: 0x%x\n",
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fuse);
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return -EPERM;
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}
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} else if (is_soc_type(MXC_SOC_MX7)) {
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/* No Calibration data in FUSE? */
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if ((fuse & 0x3ffff) == 0)
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return -EPERM;
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/* We do not support 105C TE2 */
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if (((fuse & 0x1c0000) >> 18) == 0x6)
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return -EPERM;
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}
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/* set critical cooling temp */
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get_cpu_temp_grade(&priv->minc, &priv->maxc);
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priv->critical = priv->maxc - TEMPERATURE_HOT_DELTA;
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priv->fuse = 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 = sizeof(struct thermal_data),
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.flags = DM_FLAG_PRE_RELOC,
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};
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