1 /* 2 * (C) Copyright 2014 Freescale Semiconductor, Inc. 3 * Author: Nitin Garg <nitin.garg@freescale.com> 4 * Ye Li <Ye.Li@freescale.com> 5 * 6 * SPDX-License-Identifier: GPL-2.0+ 7 */ 8 9 #include <config.h> 10 #include <common.h> 11 #include <div64.h> 12 #include <fuse.h> 13 #include <asm/io.h> 14 #include <asm/arch/clock.h> 15 #include <asm/arch/sys_proto.h> 16 #include <dm.h> 17 #include <errno.h> 18 #include <malloc.h> 19 #include <linux/math64.h> 20 #include <thermal.h> 21 #include <imx_thermal.h> 22 23 /* board will busyloop until this many degrees C below CPU max temperature */ 24 #define TEMPERATURE_HOT_DELTA 5 /* CPU maxT - 5C */ 25 #define FACTOR0 10000000 26 #define FACTOR1 15423 27 #define FACTOR2 4148468 28 #define OFFSET 3580661 29 #define MEASURE_FREQ 327 30 #define TEMPERATURE_MIN -40 31 #define TEMPERATURE_HOT 85 32 #define TEMPERATURE_MAX 125 33 34 #define TEMPSENSE0_TEMP_CNT_SHIFT 8 35 #define TEMPSENSE0_TEMP_CNT_MASK (0xfff << TEMPSENSE0_TEMP_CNT_SHIFT) 36 #define TEMPSENSE0_FINISHED (1 << 2) 37 #define TEMPSENSE0_MEASURE_TEMP (1 << 1) 38 #define TEMPSENSE0_POWER_DOWN (1 << 0) 39 #define MISC0_REFTOP_SELBIASOFF (1 << 3) 40 #define TEMPSENSE1_MEASURE_FREQ 0xffff 41 42 struct thermal_data { 43 unsigned int fuse; 44 int critical; 45 int minc; 46 int maxc; 47 }; 48 49 #if defined(CONFIG_MX6) 50 static int read_cpu_temperature(struct udevice *dev) 51 { 52 int temperature; 53 unsigned int reg, n_meas; 54 const struct imx_thermal_plat *pdata = dev_get_platdata(dev); 55 struct anatop_regs *anatop = (struct anatop_regs *)pdata->regs; 56 struct thermal_data *priv = dev_get_priv(dev); 57 u32 fuse = priv->fuse; 58 int t1, n1; 59 s64 c1, c2; 60 s64 temp64; 61 s32 rem; 62 63 /* 64 * Sensor data layout: 65 * [31:20] - sensor value @ 25C 66 * We use universal formula now and only need sensor value @ 25C 67 * slope = 0.4445388 - (0.0016549 * 25C fuse) 68 */ 69 n1 = fuse >> 20; 70 t1 = 25; /* t1 always 25C */ 71 72 /* 73 * Derived from linear interpolation: 74 * slope = 0.4445388 - (0.0016549 * 25C fuse) 75 * slope = (FACTOR2 - FACTOR1 * n1) / FACTOR0 76 * offset = 3.580661 77 * offset = OFFSET / 1000000 78 * (Nmeas - n1) / (Tmeas - t1 - offset) = slope 79 * We want to reduce this down to the minimum computation necessary 80 * for each temperature read. Also, we want Tmeas in millicelsius 81 * and we don't want to lose precision from integer division. So... 82 * Tmeas = (Nmeas - n1) / slope + t1 + offset 83 * milli_Tmeas = 1000000 * (Nmeas - n1) / slope + 1000000 * t1 + OFFSET 84 * milli_Tmeas = -1000000 * (n1 - Nmeas) / slope + 1000000 * t1 + OFFSET 85 * Let constant c1 = (-1000000 / slope) 86 * milli_Tmeas = (n1 - Nmeas) * c1 + 1000000 * t1 + OFFSET 87 * Let constant c2 = n1 *c1 + 1000000 * t1 88 * milli_Tmeas = (c2 - Nmeas * c1) + OFFSET 89 * Tmeas = ((c2 - Nmeas * c1) + OFFSET) / 1000000 90 */ 91 temp64 = FACTOR0; 92 temp64 *= 1000000; 93 temp64 = div_s64_rem(temp64, FACTOR1 * n1 - FACTOR2, &rem); 94 c1 = temp64; 95 c2 = n1 * c1 + 1000000 * t1; 96 97 /* 98 * now we only use single measure, every time we read 99 * the temperature, we will power on/down anadig thermal 100 * module 101 */ 102 writel(TEMPSENSE0_POWER_DOWN, &anatop->tempsense0_clr); 103 writel(MISC0_REFTOP_SELBIASOFF, &anatop->ana_misc0_set); 104 105 /* setup measure freq */ 106 reg = readl(&anatop->tempsense1); 107 reg &= ~TEMPSENSE1_MEASURE_FREQ; 108 reg |= MEASURE_FREQ; 109 writel(reg, &anatop->tempsense1); 110 111 /* start the measurement process */ 112 writel(TEMPSENSE0_MEASURE_TEMP, &anatop->tempsense0_clr); 113 writel(TEMPSENSE0_FINISHED, &anatop->tempsense0_clr); 114 writel(TEMPSENSE0_MEASURE_TEMP, &anatop->tempsense0_set); 115 116 /* make sure that the latest temp is valid */ 117 while ((readl(&anatop->tempsense0) & 118 TEMPSENSE0_FINISHED) == 0) 119 udelay(10000); 120 121 /* read temperature count */ 122 reg = readl(&anatop->tempsense0); 123 n_meas = (reg & TEMPSENSE0_TEMP_CNT_MASK) 124 >> TEMPSENSE0_TEMP_CNT_SHIFT; 125 writel(TEMPSENSE0_FINISHED, &anatop->tempsense0_clr); 126 127 /* Tmeas = (c2 - Nmeas * c1 + OFFSET) / 1000000 */ 128 temperature = div_s64_rem(c2 - n_meas * c1 + OFFSET, 1000000, &rem); 129 130 /* power down anatop thermal sensor */ 131 writel(TEMPSENSE0_POWER_DOWN, &anatop->tempsense0_set); 132 writel(MISC0_REFTOP_SELBIASOFF, &anatop->ana_misc0_clr); 133 134 return temperature; 135 } 136 #elif defined(CONFIG_MX7) 137 static int read_cpu_temperature(struct udevice *dev) 138 { 139 unsigned int reg, tmp; 140 unsigned int raw_25c, te1; 141 int temperature; 142 unsigned int *priv = dev_get_priv(dev); 143 u32 fuse = *priv; 144 struct mxc_ccm_anatop_reg *ccm_anatop = (struct mxc_ccm_anatop_reg *) 145 ANATOP_BASE_ADDR; 146 /* 147 * fuse data layout: 148 * [31:21] sensor value @ 25C 149 * [20:18] hot temperature value 150 * [17:9] sensor value of room 151 * [8:0] sensor value of hot 152 */ 153 154 raw_25c = fuse >> 21; 155 if (raw_25c == 0) 156 raw_25c = 25; 157 158 te1 = (fuse >> 9) & 0x1ff; 159 160 /* 161 * now we only use single measure, every time we read 162 * the temperature, we will power on/down anadig thermal 163 * module 164 */ 165 writel(TEMPMON_HW_ANADIG_TEMPSENSE1_POWER_DOWN_MASK, &ccm_anatop->tempsense1_clr); 166 writel(PMU_REF_REFTOP_SELFBIASOFF_MASK, &ccm_anatop->ref_set); 167 168 /* write measure freq */ 169 reg = readl(&ccm_anatop->tempsense1); 170 reg &= ~TEMPMON_HW_ANADIG_TEMPSENSE1_MEASURE_FREQ_MASK; 171 reg |= TEMPMON_HW_ANADIG_TEMPSENSE1_MEASURE_FREQ(MEASURE_FREQ); 172 writel(reg, &ccm_anatop->tempsense1); 173 174 writel(TEMPMON_HW_ANADIG_TEMPSENSE1_MEASURE_TEMP_MASK, &ccm_anatop->tempsense1_clr); 175 writel(TEMPMON_HW_ANADIG_TEMPSENSE1_FINISHED_MASK, &ccm_anatop->tempsense1_clr); 176 writel(TEMPMON_HW_ANADIG_TEMPSENSE1_MEASURE_TEMP_MASK, &ccm_anatop->tempsense1_set); 177 178 if (soc_rev() >= CHIP_REV_1_1) { 179 while ((readl(&ccm_anatop->tempsense1) & 180 TEMPMON_HW_ANADIG_TEMPSENSE1_FINISHED_MASK) == 0) 181 ; 182 reg = readl(&ccm_anatop->tempsense1); 183 tmp = (reg & TEMPMON_HW_ANADIG_TEMPSENSE1_TEMP_VALUE_MASK) 184 >> TEMPMON_HW_ANADIG_TEMPSENSE1_TEMP_VALUE_SHIFT; 185 } else { 186 /* 187 * Since we can not rely on finish bit, use 10ms 188 * delay to get temperature. From RM, 17us is 189 * enough to get data, but to gurantee to get 190 * the data, delay 10ms here. 191 */ 192 udelay(10000); 193 reg = readl(&ccm_anatop->tempsense1); 194 tmp = (reg & TEMPMON_HW_ANADIG_TEMPSENSE1_TEMP_VALUE_MASK) 195 >> TEMPMON_HW_ANADIG_TEMPSENSE1_TEMP_VALUE_SHIFT; 196 } 197 198 writel(TEMPMON_HW_ANADIG_TEMPSENSE1_FINISHED_MASK, &ccm_anatop->tempsense1_clr); 199 200 /* power down anatop thermal sensor */ 201 writel(TEMPMON_HW_ANADIG_TEMPSENSE1_POWER_DOWN_MASK, &ccm_anatop->tempsense1_set); 202 writel(PMU_REF_REFTOP_SELFBIASOFF_MASK, &ccm_anatop->ref_clr); 203 204 /* Single point */ 205 temperature = tmp - (te1 - raw_25c); 206 207 return temperature; 208 } 209 #endif 210 211 int imx_thermal_get_temp(struct udevice *dev, int *temp) 212 { 213 struct thermal_data *priv = dev_get_priv(dev); 214 int cpu_tmp = 0; 215 216 cpu_tmp = read_cpu_temperature(dev); 217 218 while (cpu_tmp >= priv->critical) { 219 printf("CPU Temperature (%dC) too close to max (%dC)", 220 cpu_tmp, priv->maxc); 221 puts(" waiting...\n"); 222 udelay(5000000); 223 cpu_tmp = read_cpu_temperature(dev); 224 } 225 226 *temp = cpu_tmp; 227 228 return 0; 229 } 230 231 static const struct dm_thermal_ops imx_thermal_ops = { 232 .get_temp = imx_thermal_get_temp, 233 }; 234 235 static int imx_thermal_probe(struct udevice *dev) 236 { 237 unsigned int fuse = ~0; 238 239 const struct imx_thermal_plat *pdata = dev_get_platdata(dev); 240 struct thermal_data *priv = dev_get_priv(dev); 241 242 /* Read Temperature calibration data fuse */ 243 fuse_read(pdata->fuse_bank, pdata->fuse_word, &fuse); 244 245 if (is_soc_type(MXC_SOC_MX6)) { 246 /* Check for valid fuse */ 247 if (fuse == 0 || fuse == ~0) { 248 debug("CPU: Thermal invalid data, fuse: 0x%x\n", 249 fuse); 250 return -EPERM; 251 } 252 } else if (is_soc_type(MXC_SOC_MX7)) { 253 /* No Calibration data in FUSE? */ 254 if ((fuse & 0x3ffff) == 0) 255 return -EPERM; 256 /* We do not support 105C TE2 */ 257 if (((fuse & 0x1c0000) >> 18) == 0x6) 258 return -EPERM; 259 } 260 261 /* set critical cooling temp */ 262 get_cpu_temp_grade(&priv->minc, &priv->maxc); 263 priv->critical = priv->maxc - TEMPERATURE_HOT_DELTA; 264 priv->fuse = fuse; 265 266 enable_thermal_clk(); 267 268 return 0; 269 } 270 271 U_BOOT_DRIVER(imx_thermal) = { 272 .name = "imx_thermal", 273 .id = UCLASS_THERMAL, 274 .ops = &imx_thermal_ops, 275 .probe = imx_thermal_probe, 276 .priv_auto_alloc_size = sizeof(struct thermal_data), 277 .flags = DM_FLAG_PRE_RELOC, 278 }; 279