2 * (C) Copyright 2014 Freescale Semiconductor, Inc.
3 * Author: Nitin Garg <nitin.garg@freescale.com>
4 * Ye Li <Ye.Li@freescale.com>
6 * SPDX-License-Identifier: GPL-2.0+
14 #include <asm/arch/clock.h>
15 #include <asm/arch/sys_proto.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;
63 * [31:20] - sensor value @ 25C
64 * We use universal formula now and only need sensor value @ 25C
65 * slope = 0.4445388 - (0.0016549 * 25C fuse)
68 t1 = 25; /* t1 always 25C */
71 * Derived from linear interpolation:
72 * slope = 0.4445388 - (0.0016549 * 25C fuse)
73 * slope = (FACTOR2 - FACTOR1 * n1) / FACTOR0
75 * offset = OFFSET / 1000000
76 * (Nmeas - n1) / (Tmeas - t1 - offset) = slope
77 * We want to reduce this down to the minimum computation necessary
78 * for each temperature read. Also, we want Tmeas in millicelsius
79 * and we don't want to lose precision from integer division. So...
80 * Tmeas = (Nmeas - n1) / slope + t1 + offset
81 * milli_Tmeas = 1000000 * (Nmeas - n1) / slope + 1000000 * t1 + OFFSET
82 * milli_Tmeas = -1000000 * (n1 - Nmeas) / slope + 1000000 * t1 + OFFSET
83 * Let constant c1 = (-1000000 / slope)
84 * milli_Tmeas = (n1 - Nmeas) * c1 + 1000000 * t1 + OFFSET
85 * Let constant c2 = n1 *c1 + 1000000 * t1
86 * milli_Tmeas = (c2 - Nmeas * c1) + OFFSET
87 * Tmeas = ((c2 - Nmeas * c1) + OFFSET) / 1000000
91 do_div(temp64, FACTOR1 * n1 - FACTOR2);
93 c2 = n1 * c1 + 1000000 * t1;
96 * now we only use single measure, every time we read
97 * the temperature, we will power on/down anadig thermal
100 writel(TEMPSENSE0_POWER_DOWN, &anatop->tempsense0_clr);
101 writel(MISC0_REFTOP_SELBIASOFF, &anatop->ana_misc0_set);
103 /* setup measure freq */
104 reg = readl(&anatop->tempsense1);
105 reg &= ~TEMPSENSE1_MEASURE_FREQ;
107 writel(reg, &anatop->tempsense1);
109 /* start the measurement process */
110 writel(TEMPSENSE0_MEASURE_TEMP, &anatop->tempsense0_clr);
111 writel(TEMPSENSE0_FINISHED, &anatop->tempsense0_clr);
112 writel(TEMPSENSE0_MEASURE_TEMP, &anatop->tempsense0_set);
114 /* make sure that the latest temp is valid */
115 while ((readl(&anatop->tempsense0) &
116 TEMPSENSE0_FINISHED) == 0)
119 /* read temperature count */
120 reg = readl(&anatop->tempsense0);
121 n_meas = (reg & TEMPSENSE0_TEMP_CNT_MASK)
122 >> TEMPSENSE0_TEMP_CNT_SHIFT;
123 writel(TEMPSENSE0_FINISHED, &anatop->tempsense0_clr);
125 /* Tmeas = (c2 - Nmeas * c1 + OFFSET) / 1000000 */
126 temperature = lldiv(c2 - n_meas * c1 + OFFSET, 1000000);
128 /* power down anatop thermal sensor */
129 writel(TEMPSENSE0_POWER_DOWN, &anatop->tempsense0_set);
130 writel(MISC0_REFTOP_SELBIASOFF, &anatop->ana_misc0_clr);
134 #elif defined(CONFIG_MX7)
135 static int read_cpu_temperature(struct udevice *dev)
137 unsigned int reg, tmp;
138 unsigned int raw_25c, te1;
140 unsigned int *priv = dev_get_priv(dev);
142 struct mxc_ccm_anatop_reg *ccm_anatop = (struct mxc_ccm_anatop_reg *)
146 * [31:21] sensor value @ 25C
147 * [20:18] hot temperature value
148 * [17:9] sensor value of room
149 * [8:0] sensor value of hot
152 raw_25c = fuse >> 21;
156 te1 = (fuse >> 9) & 0x1ff;
159 * now we only use single measure, every time we read
160 * the temperature, we will power on/down anadig thermal
163 writel(TEMPMON_HW_ANADIG_TEMPSENSE1_POWER_DOWN_MASK, &ccm_anatop->tempsense1_clr);
164 writel(PMU_REF_REFTOP_SELFBIASOFF_MASK, &ccm_anatop->ref_set);
166 /* write measure freq */
167 reg = readl(&ccm_anatop->tempsense1);
168 reg &= ~TEMPMON_HW_ANADIG_TEMPSENSE1_MEASURE_FREQ_MASK;
169 reg |= TEMPMON_HW_ANADIG_TEMPSENSE1_MEASURE_FREQ(MEASURE_FREQ);
170 writel(reg, &ccm_anatop->tempsense1);
172 writel(TEMPMON_HW_ANADIG_TEMPSENSE1_MEASURE_TEMP_MASK, &ccm_anatop->tempsense1_clr);
173 writel(TEMPMON_HW_ANADIG_TEMPSENSE1_FINISHED_MASK, &ccm_anatop->tempsense1_clr);
174 writel(TEMPMON_HW_ANADIG_TEMPSENSE1_MEASURE_TEMP_MASK, &ccm_anatop->tempsense1_set);
176 if (soc_rev() >= CHIP_REV_1_1) {
177 while ((readl(&ccm_anatop->tempsense1) &
178 TEMPMON_HW_ANADIG_TEMPSENSE1_FINISHED_MASK) == 0)
180 reg = readl(&ccm_anatop->tempsense1);
181 tmp = (reg & TEMPMON_HW_ANADIG_TEMPSENSE1_TEMP_VALUE_MASK)
182 >> TEMPMON_HW_ANADIG_TEMPSENSE1_TEMP_VALUE_SHIFT;
185 * Since we can not rely on finish bit, use 10ms
186 * delay to get temperature. From RM, 17us is
187 * enough to get data, but to gurantee to get
188 * the data, delay 10ms here.
191 reg = readl(&ccm_anatop->tempsense1);
192 tmp = (reg & TEMPMON_HW_ANADIG_TEMPSENSE1_TEMP_VALUE_MASK)
193 >> TEMPMON_HW_ANADIG_TEMPSENSE1_TEMP_VALUE_SHIFT;
196 writel(TEMPMON_HW_ANADIG_TEMPSENSE1_FINISHED_MASK, &ccm_anatop->tempsense1_clr);
198 /* power down anatop thermal sensor */
199 writel(TEMPMON_HW_ANADIG_TEMPSENSE1_POWER_DOWN_MASK, &ccm_anatop->tempsense1_set);
200 writel(PMU_REF_REFTOP_SELFBIASOFF_MASK, &ccm_anatop->ref_clr);
203 temperature = tmp - (te1 - raw_25c);
209 int imx_thermal_get_temp(struct udevice *dev, int *temp)
211 struct thermal_data *priv = dev_get_priv(dev);
214 cpu_tmp = read_cpu_temperature(dev);
216 while (cpu_tmp >= priv->critical) {
217 printf("CPU Temperature (%dC) too close to max (%dC)",
218 cpu_tmp, priv->maxc);
219 puts(" waiting...\n");
221 cpu_tmp = read_cpu_temperature(dev);
229 static const struct dm_thermal_ops imx_thermal_ops = {
230 .get_temp = imx_thermal_get_temp,
233 static int imx_thermal_probe(struct udevice *dev)
235 unsigned int fuse = ~0;
237 const struct imx_thermal_plat *pdata = dev_get_platdata(dev);
238 struct thermal_data *priv = dev_get_priv(dev);
240 /* Read Temperature calibration data fuse */
241 fuse_read(pdata->fuse_bank, pdata->fuse_word, &fuse);
243 if (is_soc_type(MXC_SOC_MX6)) {
244 /* Check for valid fuse */
245 if (fuse == 0 || fuse == ~0) {
246 debug("CPU: Thermal invalid data, fuse: 0x%x\n",
250 } else if (is_soc_type(MXC_SOC_MX7)) {
251 /* No Calibration data in FUSE? */
252 if ((fuse & 0x3ffff) == 0)
254 /* We do not support 105C TE2 */
255 if (((fuse & 0x1c0000) >> 18) == 0x6)
259 /* set critical cooling temp */
260 get_cpu_temp_grade(&priv->minc, &priv->maxc);
261 priv->critical = priv->maxc - TEMPERATURE_HOT_DELTA;
264 enable_thermal_clk();
269 U_BOOT_DRIVER(imx_thermal) = {
270 .name = "imx_thermal",
271 .id = UCLASS_THERMAL,
272 .ops = &imx_thermal_ops,
273 .probe = imx_thermal_probe,
274 .priv_auto_alloc_size = sizeof(struct thermal_data),
275 .flags = DM_FLAG_PRE_RELOC,