1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * (C) Copyright 2014 Freescale Semiconductor, Inc. 4 * Author: Nitin Garg <nitin.garg (at) freescale.com> 5 * Ye Li <Ye.Li (at) 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
