1 // SPDX-License-Identifier: GPL-2.0+
3 * (C) Copyright 2014 Freescale Semiconductor, Inc.
4 * Author: Nitin Garg <nitin.garg@freescale.com>
5 * Ye Li <Ye.Li@freescale.com>
13 #include <asm/arch/clock.h>
14 #include <asm/arch/sys_proto.h>
18 #include <linux/math64.h>
20 #include <imx_thermal.h>
22 /* board will busyloop until this many degrees C below CPU max temperature */
23 #define TEMPERATURE_HOT_DELTA 5 /* CPU maxT - 5C */
24 #define FACTOR0 10000000
26 #define FACTOR2 4148468
27 #define OFFSET 3580661
28 #define MEASURE_FREQ 327
29 #define TEMPERATURE_MIN -40
30 #define TEMPERATURE_HOT 85
31 #define TEMPERATURE_MAX 125
33 #define TEMPSENSE0_TEMP_CNT_SHIFT 8
34 #define TEMPSENSE0_TEMP_CNT_MASK (0xfff << TEMPSENSE0_TEMP_CNT_SHIFT)
35 #define TEMPSENSE0_FINISHED (1 << 2)
36 #define TEMPSENSE0_MEASURE_TEMP (1 << 1)
37 #define TEMPSENSE0_POWER_DOWN (1 << 0)
38 #define MISC0_REFTOP_SELBIASOFF (1 << 3)
39 #define TEMPSENSE1_MEASURE_FREQ 0xffff
48 #if defined(CONFIG_MX6)
49 static int read_cpu_temperature(struct udevice *dev)
52 unsigned int reg, n_meas;
53 const struct imx_thermal_plat *pdata = dev_get_platdata(dev);
54 struct anatop_regs *anatop = (struct anatop_regs *)pdata->regs;
55 struct thermal_data *priv = dev_get_priv(dev);
56 u32 fuse = priv->fuse;
64 * [31:20] - sensor value @ 25C
65 * We use universal formula now and only need sensor value @ 25C
66 * slope = 0.4445388 - (0.0016549 * 25C fuse)
69 t1 = 25; /* t1 always 25C */
72 * Derived from linear interpolation:
73 * slope = 0.4445388 - (0.0016549 * 25C fuse)
74 * slope = (FACTOR2 - FACTOR1 * n1) / FACTOR0
76 * offset = OFFSET / 1000000
77 * (Nmeas - n1) / (Tmeas - t1 - offset) = slope
78 * We want to reduce this down to the minimum computation necessary
79 * for each temperature read. Also, we want Tmeas in millicelsius
80 * and we don't want to lose precision from integer division. So...
81 * Tmeas = (Nmeas - n1) / slope + t1 + offset
82 * milli_Tmeas = 1000000 * (Nmeas - n1) / slope + 1000000 * t1 + OFFSET
83 * milli_Tmeas = -1000000 * (n1 - Nmeas) / slope + 1000000 * t1 + OFFSET
84 * Let constant c1 = (-1000000 / slope)
85 * milli_Tmeas = (n1 - Nmeas) * c1 + 1000000 * t1 + OFFSET
86 * Let constant c2 = n1 *c1 + 1000000 * t1
87 * milli_Tmeas = (c2 - Nmeas * c1) + OFFSET
88 * Tmeas = ((c2 - Nmeas * c1) + OFFSET) / 1000000
92 temp64 = div_s64_rem(temp64, FACTOR1 * n1 - FACTOR2, &rem);
94 c2 = n1 * c1 + 1000000 * t1;
97 * now we only use single measure, every time we read
98 * the temperature, we will power on/down anadig thermal
101 writel(TEMPSENSE0_POWER_DOWN, &anatop->tempsense0_clr);
102 writel(MISC0_REFTOP_SELBIASOFF, &anatop->ana_misc0_set);
104 /* setup measure freq */
105 reg = readl(&anatop->tempsense1);
106 reg &= ~TEMPSENSE1_MEASURE_FREQ;
108 writel(reg, &anatop->tempsense1);
110 /* start the measurement process */
111 writel(TEMPSENSE0_MEASURE_TEMP, &anatop->tempsense0_clr);
112 writel(TEMPSENSE0_FINISHED, &anatop->tempsense0_clr);
113 writel(TEMPSENSE0_MEASURE_TEMP, &anatop->tempsense0_set);
115 /* make sure that the latest temp is valid */
116 while ((readl(&anatop->tempsense0) &
117 TEMPSENSE0_FINISHED) == 0)
120 /* read temperature count */
121 reg = readl(&anatop->tempsense0);
122 n_meas = (reg & TEMPSENSE0_TEMP_CNT_MASK)
123 >> TEMPSENSE0_TEMP_CNT_SHIFT;
124 writel(TEMPSENSE0_FINISHED, &anatop->tempsense0_clr);
126 /* Tmeas = (c2 - Nmeas * c1 + OFFSET) / 1000000 */
127 temperature = div_s64_rem(c2 - n_meas * c1 + OFFSET, 1000000, &rem);
129 /* power down anatop thermal sensor */
130 writel(TEMPSENSE0_POWER_DOWN, &anatop->tempsense0_set);
131 writel(MISC0_REFTOP_SELBIASOFF, &anatop->ana_misc0_clr);
135 #elif defined(CONFIG_MX7)
136 static int read_cpu_temperature(struct udevice *dev)
138 unsigned int reg, tmp;
139 unsigned int raw_25c, te1;
141 unsigned int *priv = dev_get_priv(dev);
143 struct mxc_ccm_anatop_reg *ccm_anatop = (struct mxc_ccm_anatop_reg *)
147 * [31:21] sensor value @ 25C
148 * [20:18] hot temperature value
149 * [17:9] sensor value of room
150 * [8:0] sensor value of hot
153 raw_25c = fuse >> 21;
157 te1 = (fuse >> 9) & 0x1ff;
160 * now we only use single measure, every time we read
161 * the temperature, we will power on/down anadig thermal
164 writel(TEMPMON_HW_ANADIG_TEMPSENSE1_POWER_DOWN_MASK, &ccm_anatop->tempsense1_clr);
165 writel(PMU_REF_REFTOP_SELFBIASOFF_MASK, &ccm_anatop->ref_set);
167 /* write measure freq */
168 reg = readl(&ccm_anatop->tempsense1);
169 reg &= ~TEMPMON_HW_ANADIG_TEMPSENSE1_MEASURE_FREQ_MASK;
170 reg |= TEMPMON_HW_ANADIG_TEMPSENSE1_MEASURE_FREQ(MEASURE_FREQ);
171 writel(reg, &ccm_anatop->tempsense1);
173 writel(TEMPMON_HW_ANADIG_TEMPSENSE1_MEASURE_TEMP_MASK, &ccm_anatop->tempsense1_clr);
174 writel(TEMPMON_HW_ANADIG_TEMPSENSE1_FINISHED_MASK, &ccm_anatop->tempsense1_clr);
175 writel(TEMPMON_HW_ANADIG_TEMPSENSE1_MEASURE_TEMP_MASK, &ccm_anatop->tempsense1_set);
177 if (soc_rev() >= CHIP_REV_1_1) {
178 while ((readl(&ccm_anatop->tempsense1) &
179 TEMPMON_HW_ANADIG_TEMPSENSE1_FINISHED_MASK) == 0)
181 reg = readl(&ccm_anatop->tempsense1);
182 tmp = (reg & TEMPMON_HW_ANADIG_TEMPSENSE1_TEMP_VALUE_MASK)
183 >> TEMPMON_HW_ANADIG_TEMPSENSE1_TEMP_VALUE_SHIFT;
186 * Since we can not rely on finish bit, use 10ms
187 * delay to get temperature. From RM, 17us is
188 * enough to get data, but to gurantee to get
189 * the data, delay 10ms here.
192 reg = readl(&ccm_anatop->tempsense1);
193 tmp = (reg & TEMPMON_HW_ANADIG_TEMPSENSE1_TEMP_VALUE_MASK)
194 >> TEMPMON_HW_ANADIG_TEMPSENSE1_TEMP_VALUE_SHIFT;
197 writel(TEMPMON_HW_ANADIG_TEMPSENSE1_FINISHED_MASK, &ccm_anatop->tempsense1_clr);
199 /* power down anatop thermal sensor */
200 writel(TEMPMON_HW_ANADIG_TEMPSENSE1_POWER_DOWN_MASK, &ccm_anatop->tempsense1_set);
201 writel(PMU_REF_REFTOP_SELFBIASOFF_MASK, &ccm_anatop->ref_clr);
204 temperature = tmp - (te1 - raw_25c);
210 int imx_thermal_get_temp(struct udevice *dev, int *temp)
212 struct thermal_data *priv = dev_get_priv(dev);
215 cpu_tmp = read_cpu_temperature(dev);
217 while (cpu_tmp >= priv->critical) {
218 printf("CPU Temperature (%dC) too close to max (%dC)",
219 cpu_tmp, priv->maxc);
220 puts(" waiting...\n");
222 cpu_tmp = read_cpu_temperature(dev);
230 static const struct dm_thermal_ops imx_thermal_ops = {
231 .get_temp = imx_thermal_get_temp,
234 static int imx_thermal_probe(struct udevice *dev)
236 unsigned int fuse = ~0;
238 const struct imx_thermal_plat *pdata = dev_get_platdata(dev);
239 struct thermal_data *priv = dev_get_priv(dev);
241 /* Read Temperature calibration data fuse */
242 fuse_read(pdata->fuse_bank, pdata->fuse_word, &fuse);
244 if (is_soc_type(MXC_SOC_MX6)) {
245 /* Check for valid fuse */
246 if (fuse == 0 || fuse == ~0) {
247 debug("CPU: Thermal invalid data, fuse: 0x%x\n",
251 } else if (is_soc_type(MXC_SOC_MX7)) {
252 /* No Calibration data in FUSE? */
253 if ((fuse & 0x3ffff) == 0)
255 /* We do not support 105C TE2 */
256 if (((fuse & 0x1c0000) >> 18) == 0x6)
260 /* set critical cooling temp */
261 get_cpu_temp_grade(&priv->minc, &priv->maxc);
262 priv->critical = priv->maxc - TEMPERATURE_HOT_DELTA;
265 enable_thermal_clk();
270 U_BOOT_DRIVER(imx_thermal) = {
271 .name = "imx_thermal",
272 .id = UCLASS_THERMAL,
273 .ops = &imx_thermal_ops,
274 .probe = imx_thermal_probe,
275 .priv_auto_alloc_size = sizeof(struct thermal_data),
276 .flags = DM_FLAG_PRE_RELOC,