1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * (C) Copyright 2014 Freescale Semiconductor, Inc.
4  * Author: Nitin Garg <nitin.garg@freescale.com>
5  *             Ye Li <Ye.Li@freescale.com>
6  */
7 
8 #include <config.h>
9 #include <common.h>
10 #include <div64.h>
11 #include <fuse.h>
12 #include <asm/io.h>
13 #include <asm/arch/clock.h>
14 #include <asm/arch/sys_proto.h>
15 #include <dm.h>
16 #include <errno.h>
17 #include <malloc.h>
18 #include <linux/math64.h>
19 #include <thermal.h>
20 #include <imx_thermal.h>
21 
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
25 #define FACTOR1			15423
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
32 
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
40 
41 struct thermal_data {
42 	unsigned int fuse;
43 	int critical;
44 	int minc;
45 	int maxc;
46 };
47 
48 #if defined(CONFIG_MX6)
49 static int read_cpu_temperature(struct udevice *dev)
50 {
51 	int temperature;
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;
57 	int t1, n1;
58 	s64 c1, c2;
59 	s64 temp64;
60 	s32 rem;
61 
62 	/*
63 	 * Sensor data layout:
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)
67 	 */
68 	n1 = fuse >> 20;
69 	t1 = 25; /* t1 always 25C */
70 
71 	/*
72 	 * Derived from linear interpolation:
73 	 * slope = 0.4445388 - (0.0016549 * 25C fuse)
74 	 * slope = (FACTOR2 - FACTOR1 * n1) / FACTOR0
75 	 * offset = 3.580661
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
89 	 */
90 	temp64 = FACTOR0;
91 	temp64 *= 1000000;
92 	temp64 = div_s64_rem(temp64, FACTOR1 * n1 - FACTOR2, &rem);
93 	c1 = temp64;
94 	c2 = n1 * c1 + 1000000 * t1;
95 
96 	/*
97 	 * now we only use single measure, every time we read
98 	 * the temperature, we will power on/down anadig thermal
99 	 * module
100 	 */
101 	writel(TEMPSENSE0_POWER_DOWN, &anatop->tempsense0_clr);
102 	writel(MISC0_REFTOP_SELBIASOFF, &anatop->ana_misc0_set);
103 
104 	/* setup measure freq */
105 	reg = readl(&anatop->tempsense1);
106 	reg &= ~TEMPSENSE1_MEASURE_FREQ;
107 	reg |= MEASURE_FREQ;
108 	writel(reg, &anatop->tempsense1);
109 
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);
114 
115 	/* make sure that the latest temp is valid */
116 	while ((readl(&anatop->tempsense0) &
117 		TEMPSENSE0_FINISHED) == 0)
118 		udelay(10000);
119 
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);
125 
126 	/* Tmeas = (c2 - Nmeas * c1 + OFFSET) / 1000000 */
127 	temperature = div_s64_rem(c2 - n_meas * c1 + OFFSET, 1000000, &rem);
128 
129 	/* power down anatop thermal sensor */
130 	writel(TEMPSENSE0_POWER_DOWN, &anatop->tempsense0_set);
131 	writel(MISC0_REFTOP_SELBIASOFF, &anatop->ana_misc0_clr);
132 
133 	return temperature;
134 }
135 #elif defined(CONFIG_MX7)
136 static int read_cpu_temperature(struct udevice *dev)
137 {
138 	unsigned int reg, tmp;
139 	unsigned int raw_25c, te1;
140 	int temperature;
141 	unsigned int *priv = dev_get_priv(dev);
142 	u32 fuse = *priv;
143 	struct mxc_ccm_anatop_reg *ccm_anatop = (struct mxc_ccm_anatop_reg *)
144 						 ANATOP_BASE_ADDR;
145 	/*
146 	 * fuse data layout:
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
151 	 */
152 
153 	raw_25c = fuse >> 21;
154 	if (raw_25c == 0)
155 		raw_25c = 25;
156 
157 	te1 = (fuse >> 9) & 0x1ff;
158 
159 	/*
160 	 * now we only use single measure, every time we read
161 	 * the temperature, we will power on/down anadig thermal
162 	 * module
163 	 */
164 	writel(TEMPMON_HW_ANADIG_TEMPSENSE1_POWER_DOWN_MASK, &ccm_anatop->tempsense1_clr);
165 	writel(PMU_REF_REFTOP_SELFBIASOFF_MASK, &ccm_anatop->ref_set);
166 
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);
172 
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);
176 
177 	if (soc_rev() >= CHIP_REV_1_1) {
178 		while ((readl(&ccm_anatop->tempsense1) &
179 		       TEMPMON_HW_ANADIG_TEMPSENSE1_FINISHED_MASK) == 0)
180 			;
181 		reg = readl(&ccm_anatop->tempsense1);
182 		tmp = (reg & TEMPMON_HW_ANADIG_TEMPSENSE1_TEMP_VALUE_MASK)
183 		       >> TEMPMON_HW_ANADIG_TEMPSENSE1_TEMP_VALUE_SHIFT;
184 	} else {
185 		/*
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.
190 		 */
191 		udelay(10000);
192 		reg = readl(&ccm_anatop->tempsense1);
193 		tmp = (reg & TEMPMON_HW_ANADIG_TEMPSENSE1_TEMP_VALUE_MASK)
194 		       >> TEMPMON_HW_ANADIG_TEMPSENSE1_TEMP_VALUE_SHIFT;
195 	}
196 
197 	writel(TEMPMON_HW_ANADIG_TEMPSENSE1_FINISHED_MASK, &ccm_anatop->tempsense1_clr);
198 
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);
202 
203 	/* Single point */
204 	temperature = tmp - (te1 - raw_25c);
205 
206 	return temperature;
207 }
208 #endif
209 
210 int imx_thermal_get_temp(struct udevice *dev, int *temp)
211 {
212 	struct thermal_data *priv = dev_get_priv(dev);
213 	int cpu_tmp = 0;
214 
215 	cpu_tmp = read_cpu_temperature(dev);
216 
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");
221 		udelay(5000000);
222 		cpu_tmp = read_cpu_temperature(dev);
223 	}
224 
225 	*temp = cpu_tmp;
226 
227 	return 0;
228 }
229 
230 static const struct dm_thermal_ops imx_thermal_ops = {
231 	.get_temp	= imx_thermal_get_temp,
232 };
233 
234 static int imx_thermal_probe(struct udevice *dev)
235 {
236 	unsigned int fuse = ~0;
237 
238 	const struct imx_thermal_plat *pdata = dev_get_platdata(dev);
239 	struct thermal_data *priv = dev_get_priv(dev);
240 
241 	/* Read Temperature calibration data fuse */
242 	fuse_read(pdata->fuse_bank, pdata->fuse_word, &fuse);
243 
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",
248 				fuse);
249 			return -EPERM;
250 		}
251 	} else if (is_soc_type(MXC_SOC_MX7)) {
252 		/* No Calibration data in FUSE? */
253 		if ((fuse & 0x3ffff) == 0)
254 			return -EPERM;
255 		/* We do not support 105C TE2 */
256 		if (((fuse & 0x1c0000) >> 18) == 0x6)
257 			return -EPERM;
258 	}
259 
260 	/* set critical cooling temp */
261 	get_cpu_temp_grade(&priv->minc, &priv->maxc);
262 	priv->critical = priv->maxc - TEMPERATURE_HOT_DELTA;
263 	priv->fuse = fuse;
264 
265 	enable_thermal_clk();
266 
267 	return 0;
268 }
269 
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,
277 };
278