1e3568d2eSYe.Li /* 2e3568d2eSYe.Li * (C) Copyright 2014 Freescale Semiconductor, Inc. 3e3568d2eSYe.Li * Author: Nitin Garg <nitin.garg@freescale.com> 4e3568d2eSYe.Li * Ye Li <Ye.Li@freescale.com> 5e3568d2eSYe.Li * 6e3568d2eSYe.Li * SPDX-License-Identifier: GPL-2.0+ 7e3568d2eSYe.Li */ 8e3568d2eSYe.Li 9e3568d2eSYe.Li #include <config.h> 10e3568d2eSYe.Li #include <common.h> 11e3568d2eSYe.Li #include <div64.h> 12e3568d2eSYe.Li #include <fuse.h> 13e3568d2eSYe.Li #include <asm/io.h> 14e3568d2eSYe.Li #include <asm/arch/clock.h> 15a91db954STim Harvey #include <asm/arch/sys_proto.h> 16e3568d2eSYe.Li #include <dm.h> 17e3568d2eSYe.Li #include <errno.h> 18e3568d2eSYe.Li #include <malloc.h> 19e3568d2eSYe.Li #include <thermal.h> 20e3568d2eSYe.Li #include <imx_thermal.h> 21e3568d2eSYe.Li 22be56de6fSTim Harvey /* board will busyloop until this many degrees C below CPU max temperature */ 23be56de6fSTim Harvey #define TEMPERATURE_HOT_DELTA 5 /* CPU maxT - 5C */ 24e3568d2eSYe.Li #define FACTOR0 10000000 25*4fac4171SPeng Fan #define FACTOR1 15423 26*4fac4171SPeng Fan #define FACTOR2 4148468 27*4fac4171SPeng Fan #define OFFSET 3580661 28e3568d2eSYe.Li #define MEASURE_FREQ 327 29d1aa6f2dSAdrian Alonso #define TEMPERATURE_MIN -40 30d1aa6f2dSAdrian Alonso #define TEMPERATURE_HOT 85 31d1aa6f2dSAdrian Alonso #define TEMPERATURE_MAX 125 32e3568d2eSYe.Li 33e3568d2eSYe.Li #define TEMPSENSE0_TEMP_CNT_SHIFT 8 34e3568d2eSYe.Li #define TEMPSENSE0_TEMP_CNT_MASK (0xfff << TEMPSENSE0_TEMP_CNT_SHIFT) 35e3568d2eSYe.Li #define TEMPSENSE0_FINISHED (1 << 2) 36e3568d2eSYe.Li #define TEMPSENSE0_MEASURE_TEMP (1 << 1) 37e3568d2eSYe.Li #define TEMPSENSE0_POWER_DOWN (1 << 0) 38e3568d2eSYe.Li #define MISC0_REFTOP_SELBIASOFF (1 << 3) 39e3568d2eSYe.Li #define TEMPSENSE1_MEASURE_FREQ 0xffff 40e3568d2eSYe.Li 41a91db954STim Harvey struct thermal_data { 42a91db954STim Harvey unsigned int fuse; 43be56de6fSTim Harvey int critical; 44a91db954STim Harvey int minc; 45a91db954STim Harvey int maxc; 46a91db954STim Harvey }; 47a91db954STim Harvey 48d1aa6f2dSAdrian Alonso #if defined(CONFIG_MX6) 49d1aa6f2dSAdrian Alonso static int read_cpu_temperature(struct udevice *dev) 50e3568d2eSYe.Li { 51e3568d2eSYe.Li int temperature; 52e3568d2eSYe.Li unsigned int reg, n_meas; 53e3568d2eSYe.Li const struct imx_thermal_plat *pdata = dev_get_platdata(dev); 54e3568d2eSYe.Li struct anatop_regs *anatop = (struct anatop_regs *)pdata->regs; 55a91db954STim Harvey struct thermal_data *priv = dev_get_priv(dev); 56a91db954STim Harvey u32 fuse = priv->fuse; 57e3568d2eSYe.Li int t1, n1; 58*4fac4171SPeng Fan u64 c1, c2; 59e3568d2eSYe.Li u64 temp64; 60e3568d2eSYe.Li 61e3568d2eSYe.Li /* 62e3568d2eSYe.Li * Sensor data layout: 63e3568d2eSYe.Li * [31:20] - sensor value @ 25C 64e3568d2eSYe.Li * We use universal formula now and only need sensor value @ 25C 65*4fac4171SPeng Fan * slope = 0.4445388 - (0.0016549 * 25C fuse) 66e3568d2eSYe.Li */ 67e3568d2eSYe.Li n1 = fuse >> 20; 68e3568d2eSYe.Li t1 = 25; /* t1 always 25C */ 69e3568d2eSYe.Li 70e3568d2eSYe.Li /* 71e3568d2eSYe.Li * Derived from linear interpolation: 72*4fac4171SPeng Fan * slope = 0.4445388 - (0.0016549 * 25C fuse) 73e3568d2eSYe.Li * slope = (FACTOR2 - FACTOR1 * n1) / FACTOR0 74*4fac4171SPeng Fan * offset = 3.580661 75*4fac4171SPeng Fan * offset = OFFSET / 1000000 76*4fac4171SPeng Fan * (Nmeas - n1) / (Tmeas - t1 - offset) = slope 77e3568d2eSYe.Li * We want to reduce this down to the minimum computation necessary 78e3568d2eSYe.Li * for each temperature read. Also, we want Tmeas in millicelsius 79e3568d2eSYe.Li * and we don't want to lose precision from integer division. So... 80*4fac4171SPeng Fan * Tmeas = (Nmeas - n1) / slope + t1 + offset 81*4fac4171SPeng Fan * milli_Tmeas = 1000000 * (Nmeas - n1) / slope + 1000000 * t1 + OFFSET 82*4fac4171SPeng Fan * milli_Tmeas = -1000000 * (n1 - Nmeas) / slope + 1000000 * t1 + OFFSET 83*4fac4171SPeng Fan * Let constant c1 = (-1000000 / slope) 84*4fac4171SPeng Fan * milli_Tmeas = (n1 - Nmeas) * c1 + 1000000 * t1 + OFFSET 85*4fac4171SPeng Fan * Let constant c2 = n1 *c1 + 1000000 * t1 86*4fac4171SPeng Fan * milli_Tmeas = (c2 - Nmeas * c1) + OFFSET 87*4fac4171SPeng Fan * Tmeas = ((c2 - Nmeas * c1) + OFFSET) / 1000000 88e3568d2eSYe.Li */ 89e3568d2eSYe.Li temp64 = FACTOR0; 90*4fac4171SPeng Fan temp64 *= 1000000; 91e3568d2eSYe.Li do_div(temp64, FACTOR1 * n1 - FACTOR2); 92e3568d2eSYe.Li c1 = temp64; 93*4fac4171SPeng Fan c2 = n1 * c1 + 1000000 * t1; 94e3568d2eSYe.Li 95e3568d2eSYe.Li /* 96e3568d2eSYe.Li * now we only use single measure, every time we read 97e3568d2eSYe.Li * the temperature, we will power on/down anadig thermal 98e3568d2eSYe.Li * module 99e3568d2eSYe.Li */ 100e3568d2eSYe.Li writel(TEMPSENSE0_POWER_DOWN, &anatop->tempsense0_clr); 101e3568d2eSYe.Li writel(MISC0_REFTOP_SELBIASOFF, &anatop->ana_misc0_set); 102e3568d2eSYe.Li 103e3568d2eSYe.Li /* setup measure freq */ 104e3568d2eSYe.Li reg = readl(&anatop->tempsense1); 105e3568d2eSYe.Li reg &= ~TEMPSENSE1_MEASURE_FREQ; 106e3568d2eSYe.Li reg |= MEASURE_FREQ; 107e3568d2eSYe.Li writel(reg, &anatop->tempsense1); 108e3568d2eSYe.Li 109e3568d2eSYe.Li /* start the measurement process */ 110e3568d2eSYe.Li writel(TEMPSENSE0_MEASURE_TEMP, &anatop->tempsense0_clr); 111e3568d2eSYe.Li writel(TEMPSENSE0_FINISHED, &anatop->tempsense0_clr); 112e3568d2eSYe.Li writel(TEMPSENSE0_MEASURE_TEMP, &anatop->tempsense0_set); 113e3568d2eSYe.Li 114e3568d2eSYe.Li /* make sure that the latest temp is valid */ 115e3568d2eSYe.Li while ((readl(&anatop->tempsense0) & 116e3568d2eSYe.Li TEMPSENSE0_FINISHED) == 0) 117e3568d2eSYe.Li udelay(10000); 118e3568d2eSYe.Li 119e3568d2eSYe.Li /* read temperature count */ 120e3568d2eSYe.Li reg = readl(&anatop->tempsense0); 121e3568d2eSYe.Li n_meas = (reg & TEMPSENSE0_TEMP_CNT_MASK) 122e3568d2eSYe.Li >> TEMPSENSE0_TEMP_CNT_SHIFT; 123e3568d2eSYe.Li writel(TEMPSENSE0_FINISHED, &anatop->tempsense0_clr); 124e3568d2eSYe.Li 125*4fac4171SPeng Fan /* Tmeas = (c2 - Nmeas * c1 + OFFSET) / 1000000 */ 126*4fac4171SPeng Fan temperature = lldiv(c2 - n_meas * c1 + OFFSET, 1000000); 127e3568d2eSYe.Li 128e3568d2eSYe.Li /* power down anatop thermal sensor */ 129e3568d2eSYe.Li writel(TEMPSENSE0_POWER_DOWN, &anatop->tempsense0_set); 130e3568d2eSYe.Li writel(MISC0_REFTOP_SELBIASOFF, &anatop->ana_misc0_clr); 131e3568d2eSYe.Li 132e3568d2eSYe.Li return temperature; 133e3568d2eSYe.Li } 134d1aa6f2dSAdrian Alonso #elif defined(CONFIG_MX7) 135d1aa6f2dSAdrian Alonso static int read_cpu_temperature(struct udevice *dev) 136d1aa6f2dSAdrian Alonso { 137fcbe8c56SPeng Fan unsigned int reg, tmp; 138d1aa6f2dSAdrian Alonso unsigned int raw_25c, te1; 139d1aa6f2dSAdrian Alonso int temperature; 140d1aa6f2dSAdrian Alonso unsigned int *priv = dev_get_priv(dev); 141d1aa6f2dSAdrian Alonso u32 fuse = *priv; 142d1aa6f2dSAdrian Alonso struct mxc_ccm_anatop_reg *ccm_anatop = (struct mxc_ccm_anatop_reg *) 143d1aa6f2dSAdrian Alonso ANATOP_BASE_ADDR; 144d1aa6f2dSAdrian Alonso /* 145d1aa6f2dSAdrian Alonso * fuse data layout: 146d1aa6f2dSAdrian Alonso * [31:21] sensor value @ 25C 147d1aa6f2dSAdrian Alonso * [20:18] hot temperature value 148d1aa6f2dSAdrian Alonso * [17:9] sensor value of room 149d1aa6f2dSAdrian Alonso * [8:0] sensor value of hot 150d1aa6f2dSAdrian Alonso */ 151d1aa6f2dSAdrian Alonso 152d1aa6f2dSAdrian Alonso raw_25c = fuse >> 21; 153d1aa6f2dSAdrian Alonso if (raw_25c == 0) 154d1aa6f2dSAdrian Alonso raw_25c = 25; 155d1aa6f2dSAdrian Alonso 156d1aa6f2dSAdrian Alonso te1 = (fuse >> 9) & 0x1ff; 157d1aa6f2dSAdrian Alonso 158d1aa6f2dSAdrian Alonso /* 159d1aa6f2dSAdrian Alonso * now we only use single measure, every time we read 160d1aa6f2dSAdrian Alonso * the temperature, we will power on/down anadig thermal 161d1aa6f2dSAdrian Alonso * module 162d1aa6f2dSAdrian Alonso */ 163d1aa6f2dSAdrian Alonso writel(TEMPMON_HW_ANADIG_TEMPSENSE1_POWER_DOWN_MASK, &ccm_anatop->tempsense1_clr); 164d1aa6f2dSAdrian Alonso writel(PMU_REF_REFTOP_SELFBIASOFF_MASK, &ccm_anatop->ref_set); 165d1aa6f2dSAdrian Alonso 166d1aa6f2dSAdrian Alonso /* write measure freq */ 167d1aa6f2dSAdrian Alonso reg = readl(&ccm_anatop->tempsense1); 168d1aa6f2dSAdrian Alonso reg &= ~TEMPMON_HW_ANADIG_TEMPSENSE1_MEASURE_FREQ_MASK; 169d1aa6f2dSAdrian Alonso reg |= TEMPMON_HW_ANADIG_TEMPSENSE1_MEASURE_FREQ(MEASURE_FREQ); 170d1aa6f2dSAdrian Alonso writel(reg, &ccm_anatop->tempsense1); 171d1aa6f2dSAdrian Alonso 172d1aa6f2dSAdrian Alonso writel(TEMPMON_HW_ANADIG_TEMPSENSE1_MEASURE_TEMP_MASK, &ccm_anatop->tempsense1_clr); 173d1aa6f2dSAdrian Alonso writel(TEMPMON_HW_ANADIG_TEMPSENSE1_FINISHED_MASK, &ccm_anatop->tempsense1_clr); 174d1aa6f2dSAdrian Alonso writel(TEMPMON_HW_ANADIG_TEMPSENSE1_MEASURE_TEMP_MASK, &ccm_anatop->tempsense1_set); 175d1aa6f2dSAdrian Alonso 176fcbe8c56SPeng Fan if (soc_rev() >= CHIP_REV_1_1) { 177fcbe8c56SPeng Fan while ((readl(&ccm_anatop->tempsense1) & 178fcbe8c56SPeng Fan TEMPMON_HW_ANADIG_TEMPSENSE1_FINISHED_MASK) == 0) 179fcbe8c56SPeng Fan ; 180d1aa6f2dSAdrian Alonso reg = readl(&ccm_anatop->tempsense1); 181d1aa6f2dSAdrian Alonso tmp = (reg & TEMPMON_HW_ANADIG_TEMPSENSE1_TEMP_VALUE_MASK) 182d1aa6f2dSAdrian Alonso >> TEMPMON_HW_ANADIG_TEMPSENSE1_TEMP_VALUE_SHIFT; 183fcbe8c56SPeng Fan } else { 184fcbe8c56SPeng Fan /* 185fcbe8c56SPeng Fan * Since we can not rely on finish bit, use 10ms 186fcbe8c56SPeng Fan * delay to get temperature. From RM, 17us is 187fcbe8c56SPeng Fan * enough to get data, but to gurantee to get 188fcbe8c56SPeng Fan * the data, delay 10ms here. 189fcbe8c56SPeng Fan */ 190fcbe8c56SPeng Fan udelay(10000); 191fcbe8c56SPeng Fan reg = readl(&ccm_anatop->tempsense1); 192fcbe8c56SPeng Fan tmp = (reg & TEMPMON_HW_ANADIG_TEMPSENSE1_TEMP_VALUE_MASK) 193fcbe8c56SPeng Fan >> TEMPMON_HW_ANADIG_TEMPSENSE1_TEMP_VALUE_SHIFT; 194fcbe8c56SPeng Fan } 195d1aa6f2dSAdrian Alonso 196d1aa6f2dSAdrian Alonso writel(TEMPMON_HW_ANADIG_TEMPSENSE1_FINISHED_MASK, &ccm_anatop->tempsense1_clr); 197d1aa6f2dSAdrian Alonso 198d1aa6f2dSAdrian Alonso /* power down anatop thermal sensor */ 199d1aa6f2dSAdrian Alonso writel(TEMPMON_HW_ANADIG_TEMPSENSE1_POWER_DOWN_MASK, &ccm_anatop->tempsense1_set); 200d1aa6f2dSAdrian Alonso writel(PMU_REF_REFTOP_SELFBIASOFF_MASK, &ccm_anatop->ref_clr); 201d1aa6f2dSAdrian Alonso 202d1aa6f2dSAdrian Alonso /* Single point */ 203d1aa6f2dSAdrian Alonso temperature = tmp - (te1 - raw_25c); 204d1aa6f2dSAdrian Alonso 205d1aa6f2dSAdrian Alonso return temperature; 206d1aa6f2dSAdrian Alonso } 207d1aa6f2dSAdrian Alonso #endif 208e3568d2eSYe.Li 209e3568d2eSYe.Li int imx_thermal_get_temp(struct udevice *dev, int *temp) 210e3568d2eSYe.Li { 211a91db954STim Harvey struct thermal_data *priv = dev_get_priv(dev); 212e3568d2eSYe.Li int cpu_tmp = 0; 213e3568d2eSYe.Li 214d1aa6f2dSAdrian Alonso cpu_tmp = read_cpu_temperature(dev); 215d1aa6f2dSAdrian Alonso 2163b7ad216STim Harvey while (cpu_tmp >= priv->critical) { 217be56de6fSTim Harvey printf("CPU Temperature (%dC) too close to max (%dC)", 218be56de6fSTim Harvey cpu_tmp, priv->maxc); 219be56de6fSTim Harvey puts(" waiting...\n"); 220e3568d2eSYe.Li udelay(5000000); 221d1aa6f2dSAdrian Alonso cpu_tmp = read_cpu_temperature(dev); 222e3568d2eSYe.Li } 223e3568d2eSYe.Li 224e3568d2eSYe.Li *temp = cpu_tmp; 225e3568d2eSYe.Li 226e3568d2eSYe.Li return 0; 227e3568d2eSYe.Li } 228e3568d2eSYe.Li 229e3568d2eSYe.Li static const struct dm_thermal_ops imx_thermal_ops = { 230e3568d2eSYe.Li .get_temp = imx_thermal_get_temp, 231e3568d2eSYe.Li }; 232e3568d2eSYe.Li 233e3568d2eSYe.Li static int imx_thermal_probe(struct udevice *dev) 234e3568d2eSYe.Li { 235e3568d2eSYe.Li unsigned int fuse = ~0; 236e3568d2eSYe.Li 237e3568d2eSYe.Li const struct imx_thermal_plat *pdata = dev_get_platdata(dev); 238a91db954STim Harvey struct thermal_data *priv = dev_get_priv(dev); 239e3568d2eSYe.Li 240e3568d2eSYe.Li /* Read Temperature calibration data fuse */ 241e3568d2eSYe.Li fuse_read(pdata->fuse_bank, pdata->fuse_word, &fuse); 242e3568d2eSYe.Li 2431368f993SAdrian Alonso if (is_soc_type(MXC_SOC_MX6)) { 244e3568d2eSYe.Li /* Check for valid fuse */ 245e3568d2eSYe.Li if (fuse == 0 || fuse == ~0) { 246c8434ccaSFabio Estevam debug("CPU: Thermal invalid data, fuse: 0x%x\n", 247d1aa6f2dSAdrian Alonso fuse); 248e3568d2eSYe.Li return -EPERM; 249e3568d2eSYe.Li } 250d1aa6f2dSAdrian Alonso } else if (is_soc_type(MXC_SOC_MX7)) { 251d1aa6f2dSAdrian Alonso /* No Calibration data in FUSE? */ 252d1aa6f2dSAdrian Alonso if ((fuse & 0x3ffff) == 0) 253d1aa6f2dSAdrian Alonso return -EPERM; 254d1aa6f2dSAdrian Alonso /* We do not support 105C TE2 */ 255d1aa6f2dSAdrian Alonso if (((fuse & 0x1c0000) >> 18) == 0x6) 256d1aa6f2dSAdrian Alonso return -EPERM; 2571368f993SAdrian Alonso } 258e3568d2eSYe.Li 259be56de6fSTim Harvey /* set critical cooling temp */ 260a91db954STim Harvey get_cpu_temp_grade(&priv->minc, &priv->maxc); 261be56de6fSTim Harvey priv->critical = priv->maxc - TEMPERATURE_HOT_DELTA; 262a91db954STim Harvey priv->fuse = fuse; 263e3568d2eSYe.Li 264e3568d2eSYe.Li enable_thermal_clk(); 265e3568d2eSYe.Li 266e3568d2eSYe.Li return 0; 267e3568d2eSYe.Li } 268e3568d2eSYe.Li 269e3568d2eSYe.Li U_BOOT_DRIVER(imx_thermal) = { 270e3568d2eSYe.Li .name = "imx_thermal", 271e3568d2eSYe.Li .id = UCLASS_THERMAL, 272e3568d2eSYe.Li .ops = &imx_thermal_ops, 273e3568d2eSYe.Li .probe = imx_thermal_probe, 274a91db954STim Harvey .priv_auto_alloc_size = sizeof(struct thermal_data), 275e3568d2eSYe.Li .flags = DM_FLAG_PRE_RELOC, 276e3568d2eSYe.Li }; 277