// SPDX-License-Identifier: GPL-2.0-only /* * Copyright (c) 2023 MediaTek Inc. * Author: Balsam CHIHI */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define LVTS_MONCTL0(__base) (__base + 0x0000) #define LVTS_MONCTL1(__base) (__base + 0x0004) #define LVTS_MONCTL2(__base) (__base + 0x0008) #define LVTS_MONINT(__base) (__base + 0x000C) #define LVTS_MONINTSTS(__base) (__base + 0x0010) #define LVTS_MONIDET0(__base) (__base + 0x0014) #define LVTS_MONIDET1(__base) (__base + 0x0018) #define LVTS_MONIDET2(__base) (__base + 0x001C) #define LVTS_MONIDET3(__base) (__base + 0x0020) #define LVTS_H2NTHRE(__base) (__base + 0x0024) #define LVTS_HTHRE(__base) (__base + 0x0028) #define LVTS_OFFSETH(__base) (__base + 0x0030) #define LVTS_OFFSETL(__base) (__base + 0x0034) #define LVTS_MSRCTL0(__base) (__base + 0x0038) #define LVTS_MSRCTL1(__base) (__base + 0x003C) #define LVTS_TSSEL(__base) (__base + 0x0040) #define LVTS_CALSCALE(__base) (__base + 0x0048) #define LVTS_ID(__base) (__base + 0x004C) #define LVTS_CONFIG(__base) (__base + 0x0050) #define LVTS_EDATA00(__base) (__base + 0x0054) #define LVTS_EDATA01(__base) (__base + 0x0058) #define LVTS_EDATA02(__base) (__base + 0x005C) #define LVTS_EDATA03(__base) (__base + 0x0060) #define LVTS_MSR0(__base) (__base + 0x0090) #define LVTS_MSR1(__base) (__base + 0x0094) #define LVTS_MSR2(__base) (__base + 0x0098) #define LVTS_MSR3(__base) (__base + 0x009C) #define LVTS_IMMD0(__base) (__base + 0x00A0) #define LVTS_IMMD1(__base) (__base + 0x00A4) #define LVTS_IMMD2(__base) (__base + 0x00A8) #define LVTS_IMMD3(__base) (__base + 0x00AC) #define LVTS_PROTCTL(__base) (__base + 0x00C0) #define LVTS_PROTTA(__base) (__base + 0x00C4) #define LVTS_PROTTB(__base) (__base + 0x00C8) #define LVTS_PROTTC(__base) (__base + 0x00CC) #define LVTS_CLKEN(__base) (__base + 0x00E4) #define LVTS_PERIOD_UNIT ((118 * 1000) / (256 * 38)) #define LVTS_GROUP_INTERVAL 1 #define LVTS_FILTER_INTERVAL 1 #define LVTS_SENSOR_INTERVAL 1 #define LVTS_HW_FILTER 0x2 #define LVTS_TSSEL_CONF 0x13121110 #define LVTS_CALSCALE_CONF 0x300 #define LVTS_MONINT_CONF 0x9FBF7BDE #define LVTS_INT_SENSOR0 0x0009001F #define LVTS_INT_SENSOR1 0x001203E0 #define LVTS_INT_SENSOR2 0x00247C00 #define LVTS_INT_SENSOR3 0x1FC00000 #define LVTS_SENSOR_MAX 4 #define LVTS_GOLDEN_TEMP_MAX 62 #define LVTS_GOLDEN_TEMP_DEFAULT 50 #define LVTS_COEFF_A -250460 #define LVTS_COEFF_B 250460 #define LVTS_MSR_IMMEDIATE_MODE 0 #define LVTS_MSR_FILTERED_MODE 1 #define LVTS_HW_SHUTDOWN_MT8195 105000 static int golden_temp = LVTS_GOLDEN_TEMP_DEFAULT; static int coeff_b = LVTS_COEFF_B; struct lvts_sensor_data { int dt_id; }; struct lvts_ctrl_data { struct lvts_sensor_data lvts_sensor[LVTS_SENSOR_MAX]; int cal_offset[LVTS_SENSOR_MAX]; int hw_tshut_temp; int num_lvts_sensor; int offset; int mode; }; struct lvts_data { const struct lvts_ctrl_data *lvts_ctrl; int num_lvts_ctrl; }; struct lvts_sensor { struct thermal_zone_device *tz; void __iomem *msr; void __iomem *base; int id; int dt_id; }; struct lvts_ctrl { struct lvts_sensor sensors[LVTS_SENSOR_MAX]; u32 calibration[LVTS_SENSOR_MAX]; u32 hw_tshut_raw_temp; int num_lvts_sensor; int mode; void __iomem *base; }; struct lvts_domain { struct lvts_ctrl *lvts_ctrl; struct reset_control *reset; struct clk *clk; int num_lvts_ctrl; void __iomem *base; size_t calib_len; u8 *calib; #ifdef CONFIG_DEBUG_FS struct dentry *dom_dentry; #endif }; #ifdef CONFIG_MTK_LVTS_THERMAL_DEBUGFS #define LVTS_DEBUG_FS_REGS(__reg) \ { \ .name = __stringify(__reg), \ .offset = __reg(0), \ } static const struct debugfs_reg32 lvts_regs[] = { LVTS_DEBUG_FS_REGS(LVTS_MONCTL0), LVTS_DEBUG_FS_REGS(LVTS_MONCTL1), LVTS_DEBUG_FS_REGS(LVTS_MONCTL2), LVTS_DEBUG_FS_REGS(LVTS_MONINT), LVTS_DEBUG_FS_REGS(LVTS_MONINTSTS), LVTS_DEBUG_FS_REGS(LVTS_MONIDET0), LVTS_DEBUG_FS_REGS(LVTS_MONIDET1), LVTS_DEBUG_FS_REGS(LVTS_MONIDET2), LVTS_DEBUG_FS_REGS(LVTS_MONIDET3), LVTS_DEBUG_FS_REGS(LVTS_H2NTHRE), LVTS_DEBUG_FS_REGS(LVTS_HTHRE), LVTS_DEBUG_FS_REGS(LVTS_OFFSETH), LVTS_DEBUG_FS_REGS(LVTS_OFFSETL), LVTS_DEBUG_FS_REGS(LVTS_MSRCTL0), LVTS_DEBUG_FS_REGS(LVTS_MSRCTL1), LVTS_DEBUG_FS_REGS(LVTS_TSSEL), LVTS_DEBUG_FS_REGS(LVTS_CALSCALE), LVTS_DEBUG_FS_REGS(LVTS_ID), LVTS_DEBUG_FS_REGS(LVTS_CONFIG), LVTS_DEBUG_FS_REGS(LVTS_EDATA00), LVTS_DEBUG_FS_REGS(LVTS_EDATA01), LVTS_DEBUG_FS_REGS(LVTS_EDATA02), LVTS_DEBUG_FS_REGS(LVTS_EDATA03), LVTS_DEBUG_FS_REGS(LVTS_MSR0), LVTS_DEBUG_FS_REGS(LVTS_MSR1), LVTS_DEBUG_FS_REGS(LVTS_MSR2), LVTS_DEBUG_FS_REGS(LVTS_MSR3), LVTS_DEBUG_FS_REGS(LVTS_IMMD0), LVTS_DEBUG_FS_REGS(LVTS_IMMD1), LVTS_DEBUG_FS_REGS(LVTS_IMMD2), LVTS_DEBUG_FS_REGS(LVTS_IMMD3), LVTS_DEBUG_FS_REGS(LVTS_PROTCTL), LVTS_DEBUG_FS_REGS(LVTS_PROTTA), LVTS_DEBUG_FS_REGS(LVTS_PROTTB), LVTS_DEBUG_FS_REGS(LVTS_PROTTC), LVTS_DEBUG_FS_REGS(LVTS_CLKEN), }; static int lvts_debugfs_init(struct device *dev, struct lvts_domain *lvts_td) { struct debugfs_regset32 *regset; struct lvts_ctrl *lvts_ctrl; struct dentry *dentry; char name[64]; int i; lvts_td->dom_dentry = debugfs_create_dir(dev_name(dev), NULL); if (!lvts_td->dom_dentry) return 0; for (i = 0; i < lvts_td->num_lvts_ctrl; i++) { lvts_ctrl = &lvts_td->lvts_ctrl[i]; sprintf(name, "controller%d", i); dentry = debugfs_create_dir(name, lvts_td->dom_dentry); if (!dentry) continue; regset = devm_kzalloc(dev, sizeof(*regset), GFP_KERNEL); if (!regset) continue; regset->base = lvts_ctrl->base; regset->regs = lvts_regs; regset->nregs = ARRAY_SIZE(lvts_regs); debugfs_create_regset32("registers", 0400, dentry, regset); } return 0; } static void lvts_debugfs_exit(struct lvts_domain *lvts_td) { debugfs_remove_recursive(lvts_td->dom_dentry); } #else static inline int lvts_debugfs_init(struct device *dev, struct lvts_domain *lvts_td) { return 0; } static void lvts_debugfs_exit(struct lvts_domain *lvts_td) { } #endif static int lvts_raw_to_temp(u32 raw_temp) { int temperature; temperature = ((s64)(raw_temp & 0xFFFF) * LVTS_COEFF_A) >> 14; temperature += coeff_b; return temperature; } static u32 lvts_temp_to_raw(int temperature) { u32 raw_temp = ((s64)(coeff_b - temperature)) << 14; raw_temp = div_s64(raw_temp, -LVTS_COEFF_A); return raw_temp; } static int lvts_get_temp(struct thermal_zone_device *tz, int *temp) { struct lvts_sensor *lvts_sensor = tz->devdata; void __iomem *msr = lvts_sensor->msr; u32 value; /* * Measurement registers: * * LVTS_MSR[0-3] / LVTS_IMMD[0-3] * * Bits: * * 32-17: Unused * 16 : Valid temperature * 15-0 : Raw temperature */ value = readl(msr); /* * As the thermal zone temperature will read before the * hardware sensor is fully initialized, we have to check the * validity of the temperature returned when reading the * measurement register. The thermal controller will set the * valid bit temperature only when it is totally initialized. * * Otherwise, we may end up with garbage values out of the * functionning temperature and directly jump to a system * shutdown. */ if (!(value & BIT(16))) return -EAGAIN; *temp = lvts_raw_to_temp(value & 0xFFFF); return 0; } static int lvts_set_trips(struct thermal_zone_device *tz, int low, int high) { struct lvts_sensor *lvts_sensor = tz->devdata; void __iomem *base = lvts_sensor->base; u32 raw_low = lvts_temp_to_raw(low); u32 raw_high = lvts_temp_to_raw(high); /* * Hot to normal temperature threshold * * LVTS_H2NTHRE * * Bits: * * 14-0 : Raw temperature for threshold */ if (low != -INT_MAX) { dev_dbg(&tz->device, "Setting low limit temperature interrupt: %d\n", low); writel(raw_low, LVTS_H2NTHRE(base)); } /* * Hot temperature threshold * * LVTS_HTHRE * * Bits: * * 14-0 : Raw temperature for threshold */ dev_dbg(&tz->device, "Setting high limit temperature interrupt: %d\n", high); writel(raw_high, LVTS_HTHRE(base)); return 0; } static irqreturn_t lvts_ctrl_irq_handler(struct lvts_ctrl *lvts_ctrl) { irqreturn_t iret = IRQ_NONE; u32 value; u32 masks[] = { LVTS_INT_SENSOR0, LVTS_INT_SENSOR1, LVTS_INT_SENSOR2, LVTS_INT_SENSOR3 }; int i; /* * Interrupt monitoring status * * LVTS_MONINTST * * Bits: * * 31 : Interrupt for stage 3 * 30 : Interrupt for stage 2 * 29 : Interrupt for state 1 * 28 : Interrupt using filter on sensor 3 * * 27 : Interrupt using immediate on sensor 3 * 26 : Interrupt normal to hot on sensor 3 * 25 : Interrupt high offset on sensor 3 * 24 : Interrupt low offset on sensor 3 * * 23 : Interrupt hot threshold on sensor 3 * 22 : Interrupt cold threshold on sensor 3 * 21 : Interrupt using filter on sensor 2 * 20 : Interrupt using filter on sensor 1 * * 19 : Interrupt using filter on sensor 0 * 18 : Interrupt using immediate on sensor 2 * 17 : Interrupt using immediate on sensor 1 * 16 : Interrupt using immediate on sensor 0 * * 15 : Interrupt device access timeout interrupt * 14 : Interrupt normal to hot on sensor 2 * 13 : Interrupt high offset interrupt on sensor 2 * 12 : Interrupt low offset interrupt on sensor 2 * * 11 : Interrupt hot threshold on sensor 2 * 10 : Interrupt cold threshold on sensor 2 * 9 : Interrupt normal to hot on sensor 1 * 8 : Interrupt high offset interrupt on sensor 1 * * 7 : Interrupt low offset interrupt on sensor 1 * 6 : Interrupt hot threshold on sensor 1 * 5 : Interrupt cold threshold on sensor 1 * 4 : Interrupt normal to hot on sensor 0 * * 3 : Interrupt high offset interrupt on sensor 0 * 2 : Interrupt low offset interrupt on sensor 0 * 1 : Interrupt hot threshold on sensor 0 * 0 : Interrupt cold threshold on sensor 0 * * We are interested in the sensor(s) responsible of the * interrupt event. We update the thermal framework with the * thermal zone associated with the sensor. The framework will * take care of the rest whatever the kind of interrupt, we * are only interested in which sensor raised the interrupt. * * sensor 3 interrupt: 0001 1111 1100 0000 0000 0000 0000 0000 * => 0x1FC00000 * sensor 2 interrupt: 0000 0000 0010 0100 0111 1100 0000 0000 * => 0x00247C00 * sensor 1 interrupt: 0000 0000 0001 0010 0000 0011 1110 0000 * => 0X001203E0 * sensor 0 interrupt: 0000 0000 0000 1001 0000 0000 0001 1111 * => 0x0009001F */ value = readl(LVTS_MONINTSTS(lvts_ctrl->base)); /* * Let's figure out which sensors raised the interrupt * * NOTE: the masks array must be ordered with the index * corresponding to the sensor id eg. index=0, mask for * sensor0. */ for (i = 0; i < ARRAY_SIZE(masks); i++) { if (!(value & masks[i])) continue; thermal_zone_device_update(lvts_ctrl->sensors[i].tz, THERMAL_TRIP_VIOLATED); iret = IRQ_HANDLED; } /* * Write back to clear the interrupt status (W1C) */ writel(value, LVTS_MONINTSTS(lvts_ctrl->base)); return iret; } /* * Temperature interrupt handler. Even if the driver supports more * interrupt modes, we use the interrupt when the temperature crosses * the hot threshold the way up and the way down (modulo the * hysteresis). * * Each thermal domain has a couple of interrupts, one for hardware * reset and another one for all the thermal events happening on the * different sensors. * * The interrupt is configured for thermal events when crossing the * hot temperature limit. At each interrupt, we check in every * controller if there is an interrupt pending. */ static irqreturn_t lvts_irq_handler(int irq, void *data) { struct lvts_domain *lvts_td = data; irqreturn_t aux, iret = IRQ_NONE; int i; for (i = 0; i < lvts_td->num_lvts_ctrl; i++) { aux = lvts_ctrl_irq_handler(lvts_td->lvts_ctrl); if (aux != IRQ_HANDLED) continue; iret = IRQ_HANDLED; } return iret; } static struct thermal_zone_device_ops lvts_ops = { .get_temp = lvts_get_temp, .set_trips = lvts_set_trips, }; static int lvts_sensor_init(struct device *dev, struct lvts_ctrl *lvts_ctrl, const struct lvts_ctrl_data *lvts_ctrl_data) { struct lvts_sensor *lvts_sensor = lvts_ctrl->sensors; void __iomem *msr_regs[] = { LVTS_MSR0(lvts_ctrl->base), LVTS_MSR1(lvts_ctrl->base), LVTS_MSR2(lvts_ctrl->base), LVTS_MSR3(lvts_ctrl->base) }; void __iomem *imm_regs[] = { LVTS_IMMD0(lvts_ctrl->base), LVTS_IMMD1(lvts_ctrl->base), LVTS_IMMD2(lvts_ctrl->base), LVTS_IMMD3(lvts_ctrl->base) }; int i; for (i = 0; i < lvts_ctrl_data->num_lvts_sensor; i++) { int dt_id = lvts_ctrl_data->lvts_sensor[i].dt_id; /* * At this point, we don't know which id matches which * sensor. Let's set arbitrally the id from the index. */ lvts_sensor[i].id = i; /* * The thermal zone registration will set the trip * point interrupt in the thermal controller * register. But this one will be reset in the * initialization after. So we need to post pone the * thermal zone creation after the controller is * setup. For this reason, we store the device tree * node id from the data in the sensor structure */ lvts_sensor[i].dt_id = dt_id; /* * We assign the base address of the thermal * controller as a back pointer. So it will be * accessible from the different thermal framework ops * as we pass the lvts_sensor pointer as thermal zone * private data. */ lvts_sensor[i].base = lvts_ctrl->base; /* * Each sensor has its own register address to read from. */ lvts_sensor[i].msr = lvts_ctrl_data->mode == LVTS_MSR_IMMEDIATE_MODE ? imm_regs[i] : msr_regs[i]; }; lvts_ctrl->num_lvts_sensor = lvts_ctrl_data->num_lvts_sensor; return 0; } /* * The efuse blob values follows the sensor enumeration per thermal * controller. The decoding of the stream is as follow: * * <--?-> <----big0 ???---> <-sensor0-> <-0-> * ------------------------------------------ * index in the stream: : | 0x0 | 0x1 | 0x2 | 0x3 | 0x4 | 0x5 | 0x6 | * ------------------------------------------ * * <--sensor1--><-0-> <----big1 ???---> <-sen * ------------------------------------------ * | 0x7 | 0x8 | 0x9 | 0xA | 0xB | OxC | OxD | * ------------------------------------------ * * sor0-> <-0-> <-sensor1-> <-0-> .......... * ------------------------------------------ * | 0x7 | 0x8 | 0x9 | 0xA | 0xB | OxC | OxD | * ------------------------------------------ * * And so on ... * * The data description gives the offset of the calibration data in * this bytes stream for each sensor. * * Each thermal controller can handle up to 4 sensors max, we don't * care if there are less as the array of calibration is sized to 4 * anyway. The unused sensor slot will be zeroed. */ static int lvts_calibration_init(struct device *dev, struct lvts_ctrl *lvts_ctrl, const struct lvts_ctrl_data *lvts_ctrl_data, u8 *efuse_calibration) { int i; for (i = 0; i < lvts_ctrl_data->num_lvts_sensor; i++) memcpy(&lvts_ctrl->calibration[i], efuse_calibration + lvts_ctrl_data->cal_offset[i], 2); return 0; } /* * The efuse bytes stream can be split into different chunk of * nvmems. This function reads and concatenate those into a single * buffer so it can be read sequentially when initializing the * calibration data. */ static int lvts_calibration_read(struct device *dev, struct lvts_domain *lvts_td, const struct lvts_data *lvts_data) { struct device_node *np = dev_of_node(dev); struct nvmem_cell *cell; struct property *prop; const char *cell_name; of_property_for_each_string(np, "nvmem-cell-names", prop, cell_name) { size_t len; u8 *efuse; cell = of_nvmem_cell_get(np, cell_name); if (IS_ERR(cell)) { dev_err(dev, "Failed to get cell '%s'\n", cell_name); return PTR_ERR(cell); } efuse = nvmem_cell_read(cell, &len); nvmem_cell_put(cell); if (IS_ERR(efuse)) { dev_err(dev, "Failed to read cell '%s'\n", cell_name); return PTR_ERR(efuse); } lvts_td->calib = devm_krealloc(dev, lvts_td->calib, lvts_td->calib_len + len, GFP_KERNEL); if (!lvts_td->calib) return -ENOMEM; memcpy(lvts_td->calib + lvts_td->calib_len, efuse, len); lvts_td->calib_len += len; kfree(efuse); } return 0; } static int lvts_golden_temp_init(struct device *dev, u32 *value) { u32 gt; gt = (*value) >> 24; if (gt && gt < LVTS_GOLDEN_TEMP_MAX) golden_temp = gt; coeff_b = golden_temp * 500 + LVTS_COEFF_B; return 0; } static int lvts_ctrl_init(struct device *dev, struct lvts_domain *lvts_td, const struct lvts_data *lvts_data) { size_t size = sizeof(*lvts_td->lvts_ctrl) * lvts_data->num_lvts_ctrl; struct lvts_ctrl *lvts_ctrl; int i, ret; /* * Create the calibration bytes stream from efuse data */ ret = lvts_calibration_read(dev, lvts_td, lvts_data); if (ret) return ret; /* * The golden temp information is contained in the first chunk * of efuse data. */ ret = lvts_golden_temp_init(dev, (u32 *)lvts_td->calib); if (ret) return ret; lvts_ctrl = devm_kzalloc(dev, size, GFP_KERNEL); if (!lvts_ctrl) return -ENOMEM; for (i = 0; i < lvts_data->num_lvts_ctrl; i++) { lvts_ctrl[i].base = lvts_td->base + lvts_data->lvts_ctrl[i].offset; ret = lvts_sensor_init(dev, &lvts_ctrl[i], &lvts_data->lvts_ctrl[i]); if (ret) return ret; ret = lvts_calibration_init(dev, &lvts_ctrl[i], &lvts_data->lvts_ctrl[i], lvts_td->calib); if (ret) return ret; /* * The mode the ctrl will use to read the temperature * (filtered or immediate) */ lvts_ctrl[i].mode = lvts_data->lvts_ctrl[i].mode; /* * The temperature to raw temperature must be done * after initializing the calibration. */ lvts_ctrl[i].hw_tshut_raw_temp = lvts_temp_to_raw(lvts_data->lvts_ctrl[i].hw_tshut_temp); } /* * We no longer need the efuse bytes stream, let's free it */ devm_kfree(dev, lvts_td->calib); lvts_td->lvts_ctrl = lvts_ctrl; lvts_td->num_lvts_ctrl = lvts_data->num_lvts_ctrl; return 0; } /* * At this point the configuration register is the only place in the * driver where we write multiple values. Per hardware constraint, * each write in the configuration register must be separated by a * delay of 2 us. */ static void lvts_write_config(struct lvts_ctrl *lvts_ctrl, u32 *cmds, int nr_cmds) { int i; /* * Configuration register */ for (i = 0; i < nr_cmds; i++) { writel(cmds[i], LVTS_CONFIG(lvts_ctrl->base)); usleep_range(2, 4); } } static int lvts_irq_init(struct lvts_ctrl *lvts_ctrl) { /* * LVTS_PROTCTL : Thermal Protection Sensor Selection * * Bits: * * 19-18 : Sensor to base the protection on * 17-16 : Strategy: * 00 : Average of 4 sensors * 01 : Max of 4 sensors * 10 : Selected sensor with bits 19-18 * 11 : Reserved */ writel(BIT(16), LVTS_PROTCTL(lvts_ctrl->base)); /* * LVTS_PROTTA : Stage 1 temperature threshold * LVTS_PROTTB : Stage 2 temperature threshold * LVTS_PROTTC : Stage 3 temperature threshold * * Bits: * * 14-0: Raw temperature threshold * * writel(0x0, LVTS_PROTTA(lvts_ctrl->base)); * writel(0x0, LVTS_PROTTB(lvts_ctrl->base)); */ writel(lvts_ctrl->hw_tshut_raw_temp, LVTS_PROTTC(lvts_ctrl->base)); /* * LVTS_MONINT : Interrupt configuration register * * The LVTS_MONINT register layout is the same as the LVTS_MONINTSTS * register, except we set the bits to enable the interrupt. */ writel(LVTS_MONINT_CONF, LVTS_MONINT(lvts_ctrl->base)); return 0; } static int lvts_domain_reset(struct device *dev, struct reset_control *reset) { int ret; ret = reset_control_assert(reset); if (ret) return ret; return reset_control_deassert(reset); } /* * Enable or disable the clocks of a specified thermal controller */ static int lvts_ctrl_set_enable(struct lvts_ctrl *lvts_ctrl, int enable) { /* * LVTS_CLKEN : Internal LVTS clock * * Bits: * * 0 : enable / disable clock */ writel(enable, LVTS_CLKEN(lvts_ctrl->base)); return 0; } static int lvts_ctrl_connect(struct device *dev, struct lvts_ctrl *lvts_ctrl) { u32 id, cmds[] = { 0xC103FFFF, 0xC502FF55 }; lvts_write_config(lvts_ctrl, cmds, ARRAY_SIZE(cmds)); /* * LVTS_ID : Get ID and status of the thermal controller * * Bits: * * 0-5 : thermal controller id * 7 : thermal controller connection is valid */ id = readl(LVTS_ID(lvts_ctrl->base)); if (!(id & BIT(7))) return -EIO; return 0; } static int lvts_ctrl_initialize(struct device *dev, struct lvts_ctrl *lvts_ctrl) { /* * Write device mask: 0xC1030000 */ u32 cmds[] = { 0xC1030E01, 0xC1030CFC, 0xC1030A8C, 0xC103098D, 0xC10308F1, 0xC10307A6, 0xC10306B8, 0xC1030500, 0xC1030420, 0xC1030300, 0xC1030030, 0xC10300F6, 0xC1030050, 0xC1030060, 0xC10300AC, 0xC10300FC, 0xC103009D, 0xC10300F1, 0xC10300E1 }; lvts_write_config(lvts_ctrl, cmds, ARRAY_SIZE(cmds)); return 0; } static int lvts_ctrl_calibrate(struct device *dev, struct lvts_ctrl *lvts_ctrl) { int i; void __iomem *lvts_edata[] = { LVTS_EDATA00(lvts_ctrl->base), LVTS_EDATA01(lvts_ctrl->base), LVTS_EDATA02(lvts_ctrl->base), LVTS_EDATA03(lvts_ctrl->base) }; /* * LVTS_EDATA0X : Efuse calibration reference value for sensor X * * Bits: * * 20-0 : Efuse value for normalization data */ for (i = 0; i < LVTS_SENSOR_MAX; i++) writel(lvts_ctrl->calibration[i], lvts_edata[i]); return 0; } static int lvts_ctrl_configure(struct device *dev, struct lvts_ctrl *lvts_ctrl) { u32 value; /* * LVTS_TSSEL : Sensing point index numbering * * Bits: * * 31-24: ADC Sense 3 * 23-16: ADC Sense 2 * 15-8 : ADC Sense 1 * 7-0 : ADC Sense 0 */ value = LVTS_TSSEL_CONF; writel(value, LVTS_TSSEL(lvts_ctrl->base)); /* * LVTS_CALSCALE : ADC voltage round */ value = 0x300; value = LVTS_CALSCALE_CONF; /* * LVTS_MSRCTL0 : Sensor filtering strategy * * Filters: * * 000 : One sample * 001 : Avg 2 samples * 010 : 4 samples, drop min and max, avg 2 samples * 011 : 6 samples, drop min and max, avg 4 samples * 100 : 10 samples, drop min and max, avg 8 samples * 101 : 18 samples, drop min and max, avg 16 samples * * Bits: * * 0-2 : Sensor0 filter * 3-5 : Sensor1 filter * 6-8 : Sensor2 filter * 9-11 : Sensor3 filter */ value = LVTS_HW_FILTER << 9 | LVTS_HW_FILTER << 6 | LVTS_HW_FILTER << 3 | LVTS_HW_FILTER; writel(value, LVTS_MSRCTL0(lvts_ctrl->base)); /* * LVTS_MSRCTL1 : Measurement control * * Bits: * * 9: Ignore MSRCTL0 config and do immediate measurement on sensor3 * 6: Ignore MSRCTL0 config and do immediate measurement on sensor2 * 5: Ignore MSRCTL0 config and do immediate measurement on sensor1 * 4: Ignore MSRCTL0 config and do immediate measurement on sensor0 * * That configuration will ignore the filtering and the delays * introduced below in MONCTL1 and MONCTL2 */ if (lvts_ctrl->mode == LVTS_MSR_IMMEDIATE_MODE) { value = BIT(9) | BIT(6) | BIT(5) | BIT(4); writel(value, LVTS_MSRCTL1(lvts_ctrl->base)); } /* * LVTS_MONCTL1 : Period unit and group interval configuration * * The clock source of LVTS thermal controller is 26MHz. * * The period unit is a time base for all the interval delays * specified in the registers. By default we use 12. The time * conversion is done by multiplying by 256 and 1/26.10^6 * * An interval delay multiplied by the period unit gives the * duration in seconds. * * - Filter interval delay is a delay between two samples of * the same sensor. * * - Sensor interval delay is a delay between two samples of * different sensors. * * - Group interval delay is a delay between different rounds. * * For example: * If Period unit = C, filter delay = 1, sensor delay = 2, group delay = 1, * and two sensors, TS1 and TS2, are in a LVTS thermal controller * and then * Period unit time = C * 1/26M * 256 = 12 * 38.46ns * 256 = 118.149us * Filter interval delay = 1 * Period unit = 118.149us * Sensor interval delay = 2 * Period unit = 236.298us * Group interval delay = 1 * Period unit = 118.149us * * TS1 TS1 ... TS1 TS2 TS2 ... TS2 TS1... * <--> Filter interval delay * <--> Sensor interval delay * <--> Group interval delay * Bits: * 29 - 20 : Group interval * 16 - 13 : Send a single interrupt when crossing the hot threshold (1) * or an interrupt everytime the hot threshold is crossed (0) * 9 - 0 : Period unit * */ value = LVTS_GROUP_INTERVAL << 20 | LVTS_PERIOD_UNIT; writel(value, LVTS_MONCTL1(lvts_ctrl->base)); /* * LVTS_MONCTL2 : Filtering and sensor interval * * Bits: * * 25-16 : Interval unit in PERIOD_UNIT between sample on * the same sensor, filter interval * 9-0 : Interval unit in PERIOD_UNIT between each sensor * */ value = LVTS_FILTER_INTERVAL << 16 | LVTS_SENSOR_INTERVAL; writel(value, LVTS_MONCTL2(lvts_ctrl->base)); return lvts_irq_init(lvts_ctrl); } static int lvts_ctrl_start(struct device *dev, struct lvts_ctrl *lvts_ctrl) { struct lvts_sensor *lvts_sensors = lvts_ctrl->sensors; struct thermal_zone_device *tz; u32 sensor_map = 0; int i; for (i = 0; i < lvts_ctrl->num_lvts_sensor; i++) { int dt_id = lvts_sensors[i].dt_id; tz = devm_thermal_of_zone_register(dev, dt_id, &lvts_sensors[i], &lvts_ops); if (IS_ERR(tz)) { /* * This thermal zone is not described in the * device tree. It is not an error from the * thermal OF code POV, we just continue. */ if (PTR_ERR(tz) == -ENODEV) continue; return PTR_ERR(tz); } /* * The thermal zone pointer will be needed in the * interrupt handler, we store it in the sensor * structure. The thermal domain structure will be * passed to the interrupt handler private data as the * interrupt is shared for all the controller * belonging to the thermal domain. */ lvts_sensors[i].tz = tz; /* * This sensor was correctly associated with a thermal * zone, let's set the corresponding bit in the sensor * map, so we can enable the temperature monitoring in * the hardware thermal controller. */ sensor_map |= BIT(i); } /* * Bits: * 9: Single point access flow * 0-3: Enable sensing point 0-3 * * The initialization of the thermal zones give us * which sensor point to enable. If any thermal zone * was not described in the device tree, it won't be * enabled here in the sensor map. */ writel(sensor_map | BIT(9), LVTS_MONCTL0(lvts_ctrl->base)); return 0; } static int lvts_domain_init(struct device *dev, struct lvts_domain *lvts_td, const struct lvts_data *lvts_data) { struct lvts_ctrl *lvts_ctrl; int i, ret; ret = lvts_ctrl_init(dev, lvts_td, lvts_data); if (ret) return ret; ret = lvts_domain_reset(dev, lvts_td->reset); if (ret) { dev_dbg(dev, "Failed to reset domain"); return ret; } for (i = 0; i < lvts_td->num_lvts_ctrl; i++) { lvts_ctrl = &lvts_td->lvts_ctrl[i]; /* * Initialization steps: * * - Enable the clock * - Connect to the LVTS * - Initialize the LVTS * - Prepare the calibration data * - Select monitored sensors * [ Configure sampling ] * [ Configure the interrupt ] * - Start measurement */ ret = lvts_ctrl_set_enable(lvts_ctrl, true); if (ret) { dev_dbg(dev, "Failed to enable LVTS clock"); return ret; } ret = lvts_ctrl_connect(dev, lvts_ctrl); if (ret) { dev_dbg(dev, "Failed to connect to LVTS controller"); return ret; } ret = lvts_ctrl_initialize(dev, lvts_ctrl); if (ret) { dev_dbg(dev, "Failed to initialize controller"); return ret; } ret = lvts_ctrl_calibrate(dev, lvts_ctrl); if (ret) { dev_dbg(dev, "Failed to calibrate controller"); return ret; } ret = lvts_ctrl_configure(dev, lvts_ctrl); if (ret) { dev_dbg(dev, "Failed to configure controller"); return ret; } ret = lvts_ctrl_start(dev, lvts_ctrl); if (ret) { dev_dbg(dev, "Failed to start controller"); return ret; } } return lvts_debugfs_init(dev, lvts_td); } static int lvts_probe(struct platform_device *pdev) { const struct lvts_data *lvts_data; struct lvts_domain *lvts_td; struct device *dev = &pdev->dev; struct resource *res; int irq, ret; lvts_td = devm_kzalloc(dev, sizeof(*lvts_td), GFP_KERNEL); if (!lvts_td) return -ENOMEM; lvts_data = of_device_get_match_data(dev); lvts_td->clk = devm_clk_get_enabled(dev, NULL); if (IS_ERR(lvts_td->clk)) return dev_err_probe(dev, PTR_ERR(lvts_td->clk), "Failed to retrieve clock\n"); res = platform_get_mem_or_io(pdev, 0); if (!res) return dev_err_probe(dev, (-ENXIO), "No IO resource\n"); lvts_td->base = devm_platform_get_and_ioremap_resource(pdev, 0, &res); if (IS_ERR(lvts_td->base)) return dev_err_probe(dev, PTR_ERR(lvts_td->base), "Failed to map io resource\n"); lvts_td->reset = devm_reset_control_get_by_index(dev, 0); if (IS_ERR(lvts_td->reset)) return dev_err_probe(dev, PTR_ERR(lvts_td->reset), "Failed to get reset control\n"); irq = platform_get_irq(pdev, 0); if (irq < 0) return dev_err_probe(dev, irq, "No irq resource\n"); ret = lvts_domain_init(dev, lvts_td, lvts_data); if (ret) return dev_err_probe(dev, ret, "Failed to initialize the lvts domain\n"); /* * At this point the LVTS is initialized and enabled. We can * safely enable the interrupt. */ ret = devm_request_threaded_irq(dev, irq, NULL, lvts_irq_handler, IRQF_ONESHOT, dev_name(dev), lvts_td); if (ret) return dev_err_probe(dev, ret, "Failed to request interrupt\n"); platform_set_drvdata(pdev, lvts_td); return 0; } static int lvts_remove(struct platform_device *pdev) { struct lvts_domain *lvts_td; int i; lvts_td = platform_get_drvdata(pdev); for (i = 0; i < lvts_td->num_lvts_ctrl; i++) lvts_ctrl_set_enable(&lvts_td->lvts_ctrl[i], false); lvts_debugfs_exit(lvts_td); return 0; } static const struct lvts_ctrl_data mt8195_lvts_data_ctrl[] = { { .cal_offset = { 0x04, 0x07 }, .lvts_sensor = { { .dt_id = MT8195_MCU_BIG_CPU0 }, { .dt_id = MT8195_MCU_BIG_CPU1 } }, .num_lvts_sensor = 2, .offset = 0x0, .hw_tshut_temp = LVTS_HW_SHUTDOWN_MT8195, }, { .cal_offset = { 0x0d, 0x10 }, .lvts_sensor = { { .dt_id = MT8195_MCU_BIG_CPU2 }, { .dt_id = MT8195_MCU_BIG_CPU3 } }, .num_lvts_sensor = 2, .offset = 0x100, .hw_tshut_temp = LVTS_HW_SHUTDOWN_MT8195, }, { .cal_offset = { 0x16, 0x19, 0x1c, 0x1f }, .lvts_sensor = { { .dt_id = MT8195_MCU_LITTLE_CPU0 }, { .dt_id = MT8195_MCU_LITTLE_CPU1 }, { .dt_id = MT8195_MCU_LITTLE_CPU2 }, { .dt_id = MT8195_MCU_LITTLE_CPU3 } }, .num_lvts_sensor = 4, .offset = 0x200, .hw_tshut_temp = LVTS_HW_SHUTDOWN_MT8195, } }; static const struct lvts_data mt8195_lvts_mcu_data = { .lvts_ctrl = mt8195_lvts_data_ctrl, .num_lvts_ctrl = ARRAY_SIZE(mt8195_lvts_data_ctrl), }; static const struct of_device_id lvts_of_match[] = { { .compatible = "mediatek,mt8195-lvts-mcu", .data = &mt8195_lvts_mcu_data }, {}, }; MODULE_DEVICE_TABLE(of, lvts_of_match); static struct platform_driver lvts_driver = { .probe = lvts_probe, .remove = lvts_remove, .driver = { .name = "mtk-lvts-thermal", .of_match_table = lvts_of_match, }, }; module_platform_driver(lvts_driver); MODULE_AUTHOR("Balsam CHIHI "); MODULE_DESCRIPTION("MediaTek LVTS Thermal Driver"); MODULE_LICENSE("GPL");