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 4297157
27 #define MEASURE_FREQ 327
28 #define TEMPERATURE_MIN -40
29 #define TEMPERATURE_HOT 85
30 #define TEMPERATURE_MAX 125
32 #define TEMPSENSE0_TEMP_CNT_SHIFT 8
33 #define TEMPSENSE0_TEMP_CNT_MASK (0xfff << TEMPSENSE0_TEMP_CNT_SHIFT)
34 #define TEMPSENSE0_FINISHED (1 << 2)
35 #define TEMPSENSE0_MEASURE_TEMP (1 << 1)
36 #define TEMPSENSE0_POWER_DOWN (1 << 0)
37 #define MISC0_REFTOP_SELBIASOFF (1 << 3)
38 #define TEMPSENSE1_MEASURE_FREQ 0xffff
47 #if defined(CONFIG_MX6)
48 static int read_cpu_temperature(struct udevice
*dev
)
51 unsigned int reg
, n_meas
;
52 const struct imx_thermal_plat
*pdata
= dev_get_platdata(dev
);
53 struct anatop_regs
*anatop
= (struct anatop_regs
*)pdata
->regs
;
54 struct thermal_data
*priv
= dev_get_priv(dev
);
55 u32 fuse
= priv
->fuse
;
62 * [31:20] - sensor value @ 25C
63 * We use universal formula now and only need sensor value @ 25C
64 * slope = 0.4297157 - (0.0015976 * 25C fuse)
67 t1
= 25; /* t1 always 25C */
70 * Derived from linear interpolation:
71 * slope = 0.4297157 - (0.0015976 * 25C fuse)
72 * slope = (FACTOR2 - FACTOR1 * n1) / FACTOR0
73 * (Nmeas - n1) / (Tmeas - t1) = slope
74 * We want to reduce this down to the minimum computation necessary
75 * for each temperature read. Also, we want Tmeas in millicelsius
76 * and we don't want to lose precision from integer division. So...
77 * Tmeas = (Nmeas - n1) / slope + t1
78 * milli_Tmeas = 1000 * (Nmeas - n1) / slope + 1000 * t1
79 * milli_Tmeas = -1000 * (n1 - Nmeas) / slope + 1000 * t1
80 * Let constant c1 = (-1000 / slope)
81 * milli_Tmeas = (n1 - Nmeas) * c1 + 1000 * t1
82 * Let constant c2 = n1 *c1 + 1000 * t1
83 * milli_Tmeas = c2 - Nmeas * c1
87 do_div(temp64
, FACTOR1
* n1
- FACTOR2
);
89 c2
= n1
* c1
+ 1000 * t1
;
92 * now we only use single measure, every time we read
93 * the temperature, we will power on/down anadig thermal
96 writel(TEMPSENSE0_POWER_DOWN
, &anatop
->tempsense0_clr
);
97 writel(MISC0_REFTOP_SELBIASOFF
, &anatop
->ana_misc0_set
);
99 /* setup measure freq */
100 reg
= readl(&anatop
->tempsense1
);
101 reg
&= ~TEMPSENSE1_MEASURE_FREQ
;
103 writel(reg
, &anatop
->tempsense1
);
105 /* start the measurement process */
106 writel(TEMPSENSE0_MEASURE_TEMP
, &anatop
->tempsense0_clr
);
107 writel(TEMPSENSE0_FINISHED
, &anatop
->tempsense0_clr
);
108 writel(TEMPSENSE0_MEASURE_TEMP
, &anatop
->tempsense0_set
);
110 /* make sure that the latest temp is valid */
111 while ((readl(&anatop
->tempsense0
) &
112 TEMPSENSE0_FINISHED
) == 0)
115 /* read temperature count */
116 reg
= readl(&anatop
->tempsense0
);
117 n_meas
= (reg
& TEMPSENSE0_TEMP_CNT_MASK
)
118 >> TEMPSENSE0_TEMP_CNT_SHIFT
;
119 writel(TEMPSENSE0_FINISHED
, &anatop
->tempsense0_clr
);
121 /* milli_Tmeas = c2 - Nmeas * c1 */
122 temperature
= (long)(c2
- n_meas
* c1
)/1000;
124 /* power down anatop thermal sensor */
125 writel(TEMPSENSE0_POWER_DOWN
, &anatop
->tempsense0_set
);
126 writel(MISC0_REFTOP_SELBIASOFF
, &anatop
->ana_misc0_clr
);
130 #elif defined(CONFIG_MX7)
131 static int read_cpu_temperature(struct udevice
*dev
)
133 unsigned int reg
, tmp
;
134 unsigned int raw_25c
, te1
;
136 unsigned int *priv
= dev_get_priv(dev
);
138 struct mxc_ccm_anatop_reg
*ccm_anatop
= (struct mxc_ccm_anatop_reg
*)
142 * [31:21] sensor value @ 25C
143 * [20:18] hot temperature value
144 * [17:9] sensor value of room
145 * [8:0] sensor value of hot
148 raw_25c
= fuse
>> 21;
152 te1
= (fuse
>> 9) & 0x1ff;
155 * now we only use single measure, every time we read
156 * the temperature, we will power on/down anadig thermal
159 writel(TEMPMON_HW_ANADIG_TEMPSENSE1_POWER_DOWN_MASK
, &ccm_anatop
->tempsense1_clr
);
160 writel(PMU_REF_REFTOP_SELFBIASOFF_MASK
, &ccm_anatop
->ref_set
);
162 /* write measure freq */
163 reg
= readl(&ccm_anatop
->tempsense1
);
164 reg
&= ~TEMPMON_HW_ANADIG_TEMPSENSE1_MEASURE_FREQ_MASK
;
165 reg
|= TEMPMON_HW_ANADIG_TEMPSENSE1_MEASURE_FREQ(MEASURE_FREQ
);
166 writel(reg
, &ccm_anatop
->tempsense1
);
168 writel(TEMPMON_HW_ANADIG_TEMPSENSE1_MEASURE_TEMP_MASK
, &ccm_anatop
->tempsense1_clr
);
169 writel(TEMPMON_HW_ANADIG_TEMPSENSE1_FINISHED_MASK
, &ccm_anatop
->tempsense1_clr
);
170 writel(TEMPMON_HW_ANADIG_TEMPSENSE1_MEASURE_TEMP_MASK
, &ccm_anatop
->tempsense1_set
);
172 if (soc_rev() >= CHIP_REV_1_1
) {
173 while ((readl(&ccm_anatop
->tempsense1
) &
174 TEMPMON_HW_ANADIG_TEMPSENSE1_FINISHED_MASK
) == 0)
176 reg
= readl(&ccm_anatop
->tempsense1
);
177 tmp
= (reg
& TEMPMON_HW_ANADIG_TEMPSENSE1_TEMP_VALUE_MASK
)
178 >> TEMPMON_HW_ANADIG_TEMPSENSE1_TEMP_VALUE_SHIFT
;
181 * Since we can not rely on finish bit, use 10ms
182 * delay to get temperature. From RM, 17us is
183 * enough to get data, but to gurantee to get
184 * the data, delay 10ms here.
187 reg
= readl(&ccm_anatop
->tempsense1
);
188 tmp
= (reg
& TEMPMON_HW_ANADIG_TEMPSENSE1_TEMP_VALUE_MASK
)
189 >> TEMPMON_HW_ANADIG_TEMPSENSE1_TEMP_VALUE_SHIFT
;
192 writel(TEMPMON_HW_ANADIG_TEMPSENSE1_FINISHED_MASK
, &ccm_anatop
->tempsense1_clr
);
194 /* power down anatop thermal sensor */
195 writel(TEMPMON_HW_ANADIG_TEMPSENSE1_POWER_DOWN_MASK
, &ccm_anatop
->tempsense1_set
);
196 writel(PMU_REF_REFTOP_SELFBIASOFF_MASK
, &ccm_anatop
->ref_clr
);
199 temperature
= tmp
- (te1
- raw_25c
);
205 int imx_thermal_get_temp(struct udevice
*dev
, int *temp
)
207 struct thermal_data
*priv
= dev_get_priv(dev
);
210 cpu_tmp
= read_cpu_temperature(dev
);
212 while (cpu_tmp
>= priv
->critical
) {
213 printf("CPU Temperature (%dC) too close to max (%dC)",
214 cpu_tmp
, priv
->maxc
);
215 puts(" waiting...\n");
217 cpu_tmp
= read_cpu_temperature(dev
);
225 static const struct dm_thermal_ops imx_thermal_ops
= {
226 .get_temp
= imx_thermal_get_temp
,
229 static int imx_thermal_probe(struct udevice
*dev
)
231 unsigned int fuse
= ~0;
233 const struct imx_thermal_plat
*pdata
= dev_get_platdata(dev
);
234 struct thermal_data
*priv
= dev_get_priv(dev
);
236 /* Read Temperature calibration data fuse */
237 fuse_read(pdata
->fuse_bank
, pdata
->fuse_word
, &fuse
);
239 if (is_soc_type(MXC_SOC_MX6
)) {
240 /* Check for valid fuse */
241 if (fuse
== 0 || fuse
== ~0) {
242 debug("CPU: Thermal invalid data, fuse: 0x%x\n",
246 } else if (is_soc_type(MXC_SOC_MX7
)) {
247 /* No Calibration data in FUSE? */
248 if ((fuse
& 0x3ffff) == 0)
250 /* We do not support 105C TE2 */
251 if (((fuse
& 0x1c0000) >> 18) == 0x6)
255 /* set critical cooling temp */
256 get_cpu_temp_grade(&priv
->minc
, &priv
->maxc
);
257 priv
->critical
= priv
->maxc
- TEMPERATURE_HOT_DELTA
;
260 enable_thermal_clk();
265 U_BOOT_DRIVER(imx_thermal
) = {
266 .name
= "imx_thermal",
267 .id
= UCLASS_THERMAL
,
268 .ops
= &imx_thermal_ops
,
269 .probe
= imx_thermal_probe
,
270 .priv_auto_alloc_size
= sizeof(struct thermal_data
),
271 .flags
= DM_FLAG_PRE_RELOC
,