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 25e3568d2eSYe.Li #define FACTOR1 15976 26e3568d2eSYe.Li #define FACTOR2 4297157 27e3568d2eSYe.Li #define MEASURE_FREQ 327 28d1aa6f2dSAdrian Alonso #define TEMPERATURE_MIN -40 29d1aa6f2dSAdrian Alonso #define TEMPERATURE_HOT 85 30d1aa6f2dSAdrian Alonso #define TEMPERATURE_MAX 125 31e3568d2eSYe.Li 32e3568d2eSYe.Li #define TEMPSENSE0_TEMP_CNT_SHIFT 8 33e3568d2eSYe.Li #define TEMPSENSE0_TEMP_CNT_MASK (0xfff << TEMPSENSE0_TEMP_CNT_SHIFT) 34e3568d2eSYe.Li #define TEMPSENSE0_FINISHED (1 << 2) 35e3568d2eSYe.Li #define TEMPSENSE0_MEASURE_TEMP (1 << 1) 36e3568d2eSYe.Li #define TEMPSENSE0_POWER_DOWN (1 << 0) 37e3568d2eSYe.Li #define MISC0_REFTOP_SELBIASOFF (1 << 3) 38e3568d2eSYe.Li #define TEMPSENSE1_MEASURE_FREQ 0xffff 39e3568d2eSYe.Li 40a91db954STim Harvey struct thermal_data { 41a91db954STim Harvey unsigned int fuse; 42be56de6fSTim Harvey int critical; 43a91db954STim Harvey int minc; 44a91db954STim Harvey int maxc; 45a91db954STim Harvey }; 46a91db954STim Harvey 47d1aa6f2dSAdrian Alonso #if defined(CONFIG_MX6) 48d1aa6f2dSAdrian Alonso static int read_cpu_temperature(struct udevice *dev) 49e3568d2eSYe.Li { 50e3568d2eSYe.Li int temperature; 51e3568d2eSYe.Li unsigned int reg, n_meas; 52e3568d2eSYe.Li const struct imx_thermal_plat *pdata = dev_get_platdata(dev); 53e3568d2eSYe.Li struct anatop_regs *anatop = (struct anatop_regs *)pdata->regs; 54a91db954STim Harvey struct thermal_data *priv = dev_get_priv(dev); 55a91db954STim Harvey u32 fuse = priv->fuse; 56e3568d2eSYe.Li int t1, n1; 57e3568d2eSYe.Li u32 c1, c2; 58e3568d2eSYe.Li u64 temp64; 59e3568d2eSYe.Li 60e3568d2eSYe.Li /* 61e3568d2eSYe.Li * Sensor data layout: 62e3568d2eSYe.Li * [31:20] - sensor value @ 25C 63e3568d2eSYe.Li * We use universal formula now and only need sensor value @ 25C 64e3568d2eSYe.Li * slope = 0.4297157 - (0.0015976 * 25C fuse) 65e3568d2eSYe.Li */ 66e3568d2eSYe.Li n1 = fuse >> 20; 67e3568d2eSYe.Li t1 = 25; /* t1 always 25C */ 68e3568d2eSYe.Li 69e3568d2eSYe.Li /* 70e3568d2eSYe.Li * Derived from linear interpolation: 71e3568d2eSYe.Li * slope = 0.4297157 - (0.0015976 * 25C fuse) 72e3568d2eSYe.Li * slope = (FACTOR2 - FACTOR1 * n1) / FACTOR0 73e3568d2eSYe.Li * (Nmeas - n1) / (Tmeas - t1) = slope 74e3568d2eSYe.Li * We want to reduce this down to the minimum computation necessary 75e3568d2eSYe.Li * for each temperature read. Also, we want Tmeas in millicelsius 76e3568d2eSYe.Li * and we don't want to lose precision from integer division. So... 77e3568d2eSYe.Li * Tmeas = (Nmeas - n1) / slope + t1 78e3568d2eSYe.Li * milli_Tmeas = 1000 * (Nmeas - n1) / slope + 1000 * t1 79e3568d2eSYe.Li * milli_Tmeas = -1000 * (n1 - Nmeas) / slope + 1000 * t1 80e3568d2eSYe.Li * Let constant c1 = (-1000 / slope) 81e3568d2eSYe.Li * milli_Tmeas = (n1 - Nmeas) * c1 + 1000 * t1 82e3568d2eSYe.Li * Let constant c2 = n1 *c1 + 1000 * t1 83e3568d2eSYe.Li * milli_Tmeas = c2 - Nmeas * c1 84e3568d2eSYe.Li */ 85e3568d2eSYe.Li temp64 = FACTOR0; 86e3568d2eSYe.Li temp64 *= 1000; 87e3568d2eSYe.Li do_div(temp64, FACTOR1 * n1 - FACTOR2); 88e3568d2eSYe.Li c1 = temp64; 89e3568d2eSYe.Li c2 = n1 * c1 + 1000 * t1; 90e3568d2eSYe.Li 91e3568d2eSYe.Li /* 92e3568d2eSYe.Li * now we only use single measure, every time we read 93e3568d2eSYe.Li * the temperature, we will power on/down anadig thermal 94e3568d2eSYe.Li * module 95e3568d2eSYe.Li */ 96e3568d2eSYe.Li writel(TEMPSENSE0_POWER_DOWN, &anatop->tempsense0_clr); 97e3568d2eSYe.Li writel(MISC0_REFTOP_SELBIASOFF, &anatop->ana_misc0_set); 98e3568d2eSYe.Li 99e3568d2eSYe.Li /* setup measure freq */ 100e3568d2eSYe.Li reg = readl(&anatop->tempsense1); 101e3568d2eSYe.Li reg &= ~TEMPSENSE1_MEASURE_FREQ; 102e3568d2eSYe.Li reg |= MEASURE_FREQ; 103e3568d2eSYe.Li writel(reg, &anatop->tempsense1); 104e3568d2eSYe.Li 105e3568d2eSYe.Li /* start the measurement process */ 106e3568d2eSYe.Li writel(TEMPSENSE0_MEASURE_TEMP, &anatop->tempsense0_clr); 107e3568d2eSYe.Li writel(TEMPSENSE0_FINISHED, &anatop->tempsense0_clr); 108e3568d2eSYe.Li writel(TEMPSENSE0_MEASURE_TEMP, &anatop->tempsense0_set); 109e3568d2eSYe.Li 110e3568d2eSYe.Li /* make sure that the latest temp is valid */ 111e3568d2eSYe.Li while ((readl(&anatop->tempsense0) & 112e3568d2eSYe.Li TEMPSENSE0_FINISHED) == 0) 113e3568d2eSYe.Li udelay(10000); 114e3568d2eSYe.Li 115e3568d2eSYe.Li /* read temperature count */ 116e3568d2eSYe.Li reg = readl(&anatop->tempsense0); 117e3568d2eSYe.Li n_meas = (reg & TEMPSENSE0_TEMP_CNT_MASK) 118e3568d2eSYe.Li >> TEMPSENSE0_TEMP_CNT_SHIFT; 119e3568d2eSYe.Li writel(TEMPSENSE0_FINISHED, &anatop->tempsense0_clr); 120e3568d2eSYe.Li 121e3568d2eSYe.Li /* milli_Tmeas = c2 - Nmeas * c1 */ 12242564025STim Harvey temperature = (long)(c2 - n_meas * c1)/1000; 123e3568d2eSYe.Li 124e3568d2eSYe.Li /* power down anatop thermal sensor */ 125e3568d2eSYe.Li writel(TEMPSENSE0_POWER_DOWN, &anatop->tempsense0_set); 126e3568d2eSYe.Li writel(MISC0_REFTOP_SELBIASOFF, &anatop->ana_misc0_clr); 127e3568d2eSYe.Li 128e3568d2eSYe.Li return temperature; 129e3568d2eSYe.Li } 130d1aa6f2dSAdrian Alonso #elif defined(CONFIG_MX7) 131d1aa6f2dSAdrian Alonso static int read_cpu_temperature(struct udevice *dev) 132d1aa6f2dSAdrian Alonso { 133d1aa6f2dSAdrian Alonso unsigned int reg, tmp, start; 134d1aa6f2dSAdrian Alonso unsigned int raw_25c, te1; 135d1aa6f2dSAdrian Alonso int temperature; 136d1aa6f2dSAdrian Alonso unsigned int *priv = dev_get_priv(dev); 137d1aa6f2dSAdrian Alonso u32 fuse = *priv; 138d1aa6f2dSAdrian Alonso struct mxc_ccm_anatop_reg *ccm_anatop = (struct mxc_ccm_anatop_reg *) 139d1aa6f2dSAdrian Alonso ANATOP_BASE_ADDR; 140d1aa6f2dSAdrian Alonso /* 141d1aa6f2dSAdrian Alonso * fuse data layout: 142d1aa6f2dSAdrian Alonso * [31:21] sensor value @ 25C 143d1aa6f2dSAdrian Alonso * [20:18] hot temperature value 144d1aa6f2dSAdrian Alonso * [17:9] sensor value of room 145d1aa6f2dSAdrian Alonso * [8:0] sensor value of hot 146d1aa6f2dSAdrian Alonso */ 147d1aa6f2dSAdrian Alonso 148d1aa6f2dSAdrian Alonso raw_25c = fuse >> 21; 149d1aa6f2dSAdrian Alonso if (raw_25c == 0) 150d1aa6f2dSAdrian Alonso raw_25c = 25; 151d1aa6f2dSAdrian Alonso 152d1aa6f2dSAdrian Alonso te1 = (fuse >> 9) & 0x1ff; 153d1aa6f2dSAdrian Alonso 154d1aa6f2dSAdrian Alonso /* 155d1aa6f2dSAdrian Alonso * now we only use single measure, every time we read 156d1aa6f2dSAdrian Alonso * the temperature, we will power on/down anadig thermal 157d1aa6f2dSAdrian Alonso * module 158d1aa6f2dSAdrian Alonso */ 159d1aa6f2dSAdrian Alonso writel(TEMPMON_HW_ANADIG_TEMPSENSE1_POWER_DOWN_MASK, &ccm_anatop->tempsense1_clr); 160d1aa6f2dSAdrian Alonso writel(PMU_REF_REFTOP_SELFBIASOFF_MASK, &ccm_anatop->ref_set); 161d1aa6f2dSAdrian Alonso 162d1aa6f2dSAdrian Alonso /* write measure freq */ 163d1aa6f2dSAdrian Alonso reg = readl(&ccm_anatop->tempsense1); 164d1aa6f2dSAdrian Alonso reg &= ~TEMPMON_HW_ANADIG_TEMPSENSE1_MEASURE_FREQ_MASK; 165d1aa6f2dSAdrian Alonso reg |= TEMPMON_HW_ANADIG_TEMPSENSE1_MEASURE_FREQ(MEASURE_FREQ); 166d1aa6f2dSAdrian Alonso writel(reg, &ccm_anatop->tempsense1); 167d1aa6f2dSAdrian Alonso 168d1aa6f2dSAdrian Alonso writel(TEMPMON_HW_ANADIG_TEMPSENSE1_MEASURE_TEMP_MASK, &ccm_anatop->tempsense1_clr); 169d1aa6f2dSAdrian Alonso writel(TEMPMON_HW_ANADIG_TEMPSENSE1_FINISHED_MASK, &ccm_anatop->tempsense1_clr); 170d1aa6f2dSAdrian Alonso writel(TEMPMON_HW_ANADIG_TEMPSENSE1_MEASURE_TEMP_MASK, &ccm_anatop->tempsense1_set); 171d1aa6f2dSAdrian Alonso 172d1aa6f2dSAdrian Alonso start = get_timer(0); 173d1aa6f2dSAdrian Alonso /* Wait max 100ms */ 174d1aa6f2dSAdrian Alonso do { 175d1aa6f2dSAdrian Alonso /* 176d1aa6f2dSAdrian Alonso * Since we can not rely on finish bit, use 1ms delay to get 177d1aa6f2dSAdrian Alonso * temperature. From RM, 17us is enough to get data, but 178d1aa6f2dSAdrian Alonso * to gurantee to get the data, delay 100ms here. 179d1aa6f2dSAdrian Alonso */ 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; 183d1aa6f2dSAdrian Alonso } while (get_timer(0) < (start + 100)); 184d1aa6f2dSAdrian Alonso 185d1aa6f2dSAdrian Alonso writel(TEMPMON_HW_ANADIG_TEMPSENSE1_FINISHED_MASK, &ccm_anatop->tempsense1_clr); 186d1aa6f2dSAdrian Alonso 187d1aa6f2dSAdrian Alonso /* power down anatop thermal sensor */ 188d1aa6f2dSAdrian Alonso writel(TEMPMON_HW_ANADIG_TEMPSENSE1_POWER_DOWN_MASK, &ccm_anatop->tempsense1_set); 189d1aa6f2dSAdrian Alonso writel(PMU_REF_REFTOP_SELFBIASOFF_MASK, &ccm_anatop->ref_clr); 190d1aa6f2dSAdrian Alonso 191d1aa6f2dSAdrian Alonso /* Single point */ 192d1aa6f2dSAdrian Alonso temperature = tmp - (te1 - raw_25c); 193d1aa6f2dSAdrian Alonso 194d1aa6f2dSAdrian Alonso return temperature; 195d1aa6f2dSAdrian Alonso } 196d1aa6f2dSAdrian Alonso #endif 197e3568d2eSYe.Li 198e3568d2eSYe.Li int imx_thermal_get_temp(struct udevice *dev, int *temp) 199e3568d2eSYe.Li { 200a91db954STim Harvey struct thermal_data *priv = dev_get_priv(dev); 201e3568d2eSYe.Li int cpu_tmp = 0; 202e3568d2eSYe.Li 203d1aa6f2dSAdrian Alonso cpu_tmp = read_cpu_temperature(dev); 204d1aa6f2dSAdrian Alonso 2053b7ad216STim Harvey while (cpu_tmp >= priv->critical) { 206be56de6fSTim Harvey printf("CPU Temperature (%dC) too close to max (%dC)", 207be56de6fSTim Harvey cpu_tmp, priv->maxc); 208be56de6fSTim Harvey puts(" waiting...\n"); 209e3568d2eSYe.Li udelay(5000000); 210d1aa6f2dSAdrian Alonso cpu_tmp = read_cpu_temperature(dev); 211e3568d2eSYe.Li } 212e3568d2eSYe.Li 213e3568d2eSYe.Li *temp = cpu_tmp; 214e3568d2eSYe.Li 215e3568d2eSYe.Li return 0; 216e3568d2eSYe.Li } 217e3568d2eSYe.Li 218e3568d2eSYe.Li static const struct dm_thermal_ops imx_thermal_ops = { 219e3568d2eSYe.Li .get_temp = imx_thermal_get_temp, 220e3568d2eSYe.Li }; 221e3568d2eSYe.Li 222e3568d2eSYe.Li static int imx_thermal_probe(struct udevice *dev) 223e3568d2eSYe.Li { 224e3568d2eSYe.Li unsigned int fuse = ~0; 225e3568d2eSYe.Li 226e3568d2eSYe.Li const struct imx_thermal_plat *pdata = dev_get_platdata(dev); 227a91db954STim Harvey struct thermal_data *priv = dev_get_priv(dev); 228e3568d2eSYe.Li 229e3568d2eSYe.Li /* Read Temperature calibration data fuse */ 230e3568d2eSYe.Li fuse_read(pdata->fuse_bank, pdata->fuse_word, &fuse); 231e3568d2eSYe.Li 2321368f993SAdrian Alonso if (is_soc_type(MXC_SOC_MX6)) { 233e3568d2eSYe.Li /* Check for valid fuse */ 234e3568d2eSYe.Li if (fuse == 0 || fuse == ~0) { 235*c8434ccaSFabio Estevam debug("CPU: Thermal invalid data, fuse: 0x%x\n", 236d1aa6f2dSAdrian Alonso fuse); 237e3568d2eSYe.Li return -EPERM; 238e3568d2eSYe.Li } 239d1aa6f2dSAdrian Alonso } else if (is_soc_type(MXC_SOC_MX7)) { 240d1aa6f2dSAdrian Alonso /* No Calibration data in FUSE? */ 241d1aa6f2dSAdrian Alonso if ((fuse & 0x3ffff) == 0) 242d1aa6f2dSAdrian Alonso return -EPERM; 243d1aa6f2dSAdrian Alonso /* We do not support 105C TE2 */ 244d1aa6f2dSAdrian Alonso if (((fuse & 0x1c0000) >> 18) == 0x6) 245d1aa6f2dSAdrian Alonso return -EPERM; 2461368f993SAdrian Alonso } 247e3568d2eSYe.Li 248be56de6fSTim Harvey /* set critical cooling temp */ 249a91db954STim Harvey get_cpu_temp_grade(&priv->minc, &priv->maxc); 250be56de6fSTim Harvey priv->critical = priv->maxc - TEMPERATURE_HOT_DELTA; 251a91db954STim Harvey priv->fuse = fuse; 252e3568d2eSYe.Li 253e3568d2eSYe.Li enable_thermal_clk(); 254e3568d2eSYe.Li 255e3568d2eSYe.Li return 0; 256e3568d2eSYe.Li } 257e3568d2eSYe.Li 258e3568d2eSYe.Li U_BOOT_DRIVER(imx_thermal) = { 259e3568d2eSYe.Li .name = "imx_thermal", 260e3568d2eSYe.Li .id = UCLASS_THERMAL, 261e3568d2eSYe.Li .ops = &imx_thermal_ops, 262e3568d2eSYe.Li .probe = imx_thermal_probe, 263a91db954STim Harvey .priv_auto_alloc_size = sizeof(struct thermal_data), 264e3568d2eSYe.Li .flags = DM_FLAG_PRE_RELOC, 265e3568d2eSYe.Li }; 266