From 014330a304100782a26bc7df02778c8c386b2857 Mon Sep 17 00:00:00 2001 From: Sascha Hauer Date: Wed, 13 May 2015 10:52:42 +0200 Subject: [PATCH 23/76] thermal: Add Mediatek thermal controller support This adds support for the Mediatek thermal controller found on MT8173 and likely other SoCs. The controller is a bit special. It does not have its own ADC, instead it controls the on-SoC AUXADC via AHB bus accesses. For this reason we need the physical address of the AUXADC. Also it controls a mux using AHB bus accesses, so we need the APMIXEDSYS physical address aswell. Signed-off-by: Sascha Hauer --- drivers/thermal/Kconfig | 8 + drivers/thermal/Makefile | 1 + drivers/thermal/mtk_thermal.c | 728 +++++++++++++++++++++++++++++++++++++++++ 3 files changed, 737 insertions(+) create mode 100644 drivers/thermal/mtk_thermal.c diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig index af40db0..3aa5500 100644 --- a/drivers/thermal/Kconfig +++ b/drivers/thermal/Kconfig @@ -285,6 +285,14 @@ config ACPI_THERMAL_REL tristate depends on ACPI +config MTK_THERMAL + tristate "Temperature sensor driver for mediatek SoCs" + depends on ARCH_MEDIATEK || COMPILE_TEST + default y + help + Enable this option if you want to have support for thermal management + controller present in Mediatek SoCs + menu "Texas Instruments thermal drivers" source "drivers/thermal/ti-soc-thermal/Kconfig" endmenu diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile index fa0dc48..51cfab7 100644 --- a/drivers/thermal/Makefile +++ b/drivers/thermal/Makefile @@ -39,3 +39,4 @@ obj-$(CONFIG_TI_SOC_THERMAL) += ti-soc-thermal/ obj-$(CONFIG_INT340X_THERMAL) += int340x_thermal/ obj-$(CONFIG_ST_THERMAL) += st/ obj-$(CONFIG_TEGRA_SOCTHERM) += tegra_soctherm.o +obj-$(CONFIG_MTK_THERMAL) += mtk_thermal.o diff --git a/drivers/thermal/mtk_thermal.c b/drivers/thermal/mtk_thermal.c new file mode 100644 index 0000000..27aab12 --- /dev/null +++ b/drivers/thermal/mtk_thermal.c @@ -0,0 +1,728 @@ +/* + * Copyright (c) 2014 MediaTek Inc. + * Author: Hanyi.Wu + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* AUXADC Registers */ +#define AUXADC_CON0_V 0x000 +#define AUXADC_CON1_V 0x004 +#define AUXADC_CON1_SET_V 0x008 +#define AUXADC_CON1_CLR_V 0x00c +#define AUXADC_CON2_V 0x010 +#define AUXADC_DATA(channel) (0x14 + (channel) * 4) +#define AUXADC_MISC_V 0x094 + +#define AUXADC_CON1_CHANNEL(x) (1 << (x)) + +/* Thermal Controller Registers */ +#define TEMPMONCTL0 0x000 +#define TEMPMONCTL1 0x004 +#define TEMPMONCTL2 0x008 +#define TEMPMONINT 0x00c +#define TEMPMONINTSTS 0x010 +#define TEMPMONIDET0 0x014 +#define TEMPMONIDET1 0x018 +#define TEMPMONIDET2 0x01c +#define TEMPH2NTHRE 0x024 +#define TEMPHTHRE 0x028 +#define TEMPCTHRE 0x02c +#define TEMPOFFSETH 0x030 +#define TEMPOFFSETL 0x034 +#define TEMPMSRCTL0 0x038 +#define TEMPMSRCTL1 0x03c +#define TEMPAHBPOLL 0x040 +#define TEMPAHBTO 0x044 +#define TEMPADCPNP0 0x048 +#define TEMPADCPNP1 0x04c +#define TEMPADCPNP2 0x050 +#define TEMPADCPNP3 0x0b4 + +#define TEMPADCMUX 0x054 +#define TEMPADCEXT 0x058 +#define TEMPADCEXT1 0x05c +#define TEMPADCEN 0x060 +#define TEMPPNPMUXADDR 0x064 +#define TEMPADCMUXADDR 0x068 +#define TEMPADCEXTADDR 0x06c +#define TEMPADCEXT1ADDR 0x070 +#define TEMPADCENADDR 0x074 +#define TEMPADCVALIDADDR 0x078 +#define TEMPADCVOLTADDR 0x07c +#define TEMPRDCTRL 0x080 +#define TEMPADCVALIDMASK 0x084 +#define TEMPADCVOLTAGESHIFT 0x088 +#define TEMPADCWRITECTRL 0x08c +#define TEMPMSR0 0x090 +#define TEMPMSR1 0x094 +#define TEMPMSR2 0x098 +#define TEMPMSR3 0x0B8 + +#define TEMPIMMD0 0x0a0 +#define TEMPIMMD1 0x0a4 +#define TEMPIMMD2 0x0a8 + +#define TEMPPROTCTL 0x0c0 +#define TEMPPROTTA 0x0c4 +#define TEMPPROTTB 0x0c8 +#define TEMPPROTTC 0x0cc + +#define TEMPSPARE0 0x0f0 +#define TEMPSPARE1 0x0f4 +#define TEMPSPARE2 0x0f8 +#define TEMPSPARE3 0x0fc + +#define PTPCORESEL 0x400 +#define THERMINTST 0x404 +#define PTPODINTST 0x408 +#define THSTAGE0ST 0x40c +#define THSTAGE1ST 0x410 +#define THSTAGE2ST 0x414 +#define THAHBST0 0x418 +#define THAHBST1 0x41c /* Only for DE debug */ +#define PTPSPARE0 0x420 +#define PTPSPARE1 0x424 +#define PTPSPARE2 0x428 +#define PTPSPARE3 0x42c +#define THSLPEVEB 0x430 + +#define TEMPMONINT_COLD(sp) ((1 << 0) << ((sp) * 5)) +#define TEMPMONINT_HOT(sp) ((1 << 1) << ((sp) * 5)) +#define TEMPMONINT_LOW_OFS(sp) ((1 << 2) << ((sp) * 5)) +#define TEMPMONINT_HIGH_OFS(sp) ((1 << 3) << ((sp) * 5)) +#define TEMPMONINT_HOT_TO_NORM(sp) ((1 << 4) << ((sp) * 5)) +#define TEMPMONINT_TIMEOUT (1 << 15) +#define TEMPMONINT_IMMEDIATE_SENSE(sp) (1 << (16 + (sp))) +#define TEMPMONINT_FILTER_SENSE(sp) (1 << (19 + (sp))) + +#define TEMPADCWRITECTRL_ADC_PNP_WRITE (1 << 0) +#define TEMPADCWRITECTRL_ADC_MUX_WRITE (1 << 1) +#define TEMPADCWRITECTRL_ADC_EXTRA_WRITE (1 << 2) +#define TEMPADCWRITECTRL_ADC_EXTRA1_WRITE (1 << 3) + +#define TEMPADCVALIDMASK_VALID_HIGH (1 << 5) +#define TEMPADCVALIDMASK_VALID_POS(bit) (bit) + +#define TEMPPROTCTL_AVERAGE (0 << 16) +#define TEMPPROTCTL_MAXIMUM (1 << 16) +#define TEMPPROTCTL_SELECTED (2 << 16) + +#define MT8173_THERMAL_ZONE_CA57 0 +#define MT8173_THERMAL_ZONE_CA53 1 +#define MT8173_THERMAL_ZONE_GPU 2 +#define MT8173_THERMAL_ZONE_CORE 3 + +#define MT8173_TS1 0 +#define MT8173_TS2 1 +#define MT8173_TS3 2 +#define MT8173_TS4 3 +#define MT8173_TSABB 4 + +/* AUXADC channel 11 is used for the temperature sensors */ +#define MT8173_TEMP_AUXADC_CHANNEL 11 + +/* The total number of temperature sensors in the MT8173 */ +#define MT8173_NUM_SENSORS 5 + +/* The number of banks in the MT8173 */ +#define MT8173_NUM_BANKS 4 + +/* The number of sensing points per bank */ +#define MT8173_NUM_SENSING_POINTS 4 + +#define THERMAL_NAME "mtk-thermal" + +struct mtk_thermal; + +struct mtk_thermal_bank { + struct mtk_thermal *mt; + struct thermal_zone_device *tz; + int id; +}; + +struct mtk_thermal { + struct device *dev; + void __iomem *thermal_base; + void __iomem *auxadc_base; + + u64 auxadc_phys_base; + u64 apmixed_phys_base; + struct reset_control *reset; + struct clk *clk_peri_therm; + struct clk *clk_auxadc; + + struct mtk_thermal_bank banks[MT8173_NUM_BANKS]; + + struct mutex lock; + + /* Calibration values */ + s32 adc_ge; + s32 adc_oe; + s32 degc_cali; + s32 o_slope; + s32 vts; +}; + +struct mtk_thermal_bank_cfg { + unsigned int enable_mask; + unsigned int sensors[4]; +}; + +static int sensor_mux_values[MT8173_NUM_SENSORS] = { 0, 1, 2, 3, 16 }; + +/* + * The MT8173 thermal controller has four banks. Each bank can read up to + * four temperature sensors simultaneously. The MT8173 has a total of 5 + * temperature sensors. We use each bank to measure a certain area of the + * SoC. Since TS2 is located centrally in the SoC it is influenced by multiple + * areas, hence is used in different banks. + */ +static struct mtk_thermal_bank_cfg bank_data[] = { + { + .enable_mask = 3, + .sensors = { MT8173_TS2, MT8173_TS3 }, + }, { + .enable_mask = 3, + .sensors = { MT8173_TS2, MT8173_TS4 }, + }, { + .enable_mask = 7, + .sensors = { MT8173_TS1, MT8173_TS2, MT8173_TSABB }, + }, { + .enable_mask = 1, + .sensors = { MT8173_TS2 }, + }, +}; + +static int tempmsr_ofs[MT8173_NUM_SENSING_POINTS] = { + TEMPMSR0, TEMPMSR1, TEMPMSR2, TEMPMSR3 +}; + +static int tempadcpnp_ofs[MT8173_NUM_SENSING_POINTS] = { + TEMPADCPNP0, TEMPADCPNP1, TEMPADCPNP2, TEMPADCPNP3 +}; + +/** + * raw_to_mcelsius - convert a raw ADC value to mcelsius + * @mt: The thermal controller + * @raw: raw ADC value + * + * This converts the raw ADC value to mcelsius using the SoC specific + * calibration constants + */ +static int raw_to_mcelsius(struct mtk_thermal *mt, u32 raw) +{ + s32 format_1, format_2, format_3, format_4; + s32 xtoomt; + s32 gain; + + raw &= 0xfff; + + gain = (10000 + mt->adc_ge); + + xtoomt = ((((mt->vts + 3350 - mt->adc_oe) * 10000) / 4096) * 10000) / + gain; + + format_1 = ((mt->degc_cali * 10) >> 1); + format_2 = (raw - mt->adc_oe); + format_3 = (((((format_2) * 10000) >> 12) * 10000) / gain) - xtoomt; + format_3 = format_3 * 15 / 18; + format_4 = ((format_3 * 100) / (165 + mt->o_slope)); + format_4 = format_4 - (format_4 << 1); + + return (format_1 + format_4) * 100; +} + +/** + * mcelsius_to_raw - convert mcelsius to raw ADC value + * @mt: The thermal controller + * @temp: The temperature in mcelsius + * + * This converts a temperature in mcelsius to a raw ADC value, needed to + * calculate the trigger values for interrupt generation. + */ +static u32 mcelsius_to_raw(struct mtk_thermal *mt, int temp) +{ + s32 format_1, format_2, format_3, format_4; + s32 xtoomt; + s32 gain; + + gain = (10000 + mt->adc_ge); + + xtoomt = ((((mt->vts + 3350 - mt->adc_oe) * 10000) / 4096) * 10000) / + gain; + + format_1 = temp - (mt->degc_cali * 1000 / 2); + format_2 = format_1 * (165 + mt->o_slope) * 18 / 15; + format_2 = format_2 - 2 * format_2; + format_3 = format_2 / 1000 + xtoomt * 10; + format_4 = (format_3 * 4096 / 10000 * gain) / 100000 + mt->adc_oe; + + return format_4; +} + +/** + * mtk_thermal_get_bank - get bank + * @bank: The bank + * + * The bank registers are banked, we have to select a bank in the + * PTPCORESEL register to access it. + */ +static void mtk_thermal_get_bank(struct mtk_thermal_bank *bank) +{ + struct mtk_thermal *mt = bank->mt; + u32 val; + + mutex_lock(&mt->lock); + + val = readl(mt->thermal_base + PTPCORESEL); + val &= ~0xf; + val |= bank->id; + writel(val, mt->thermal_base + PTPCORESEL); +} + +/** + * mtk_thermal_put_bank - release bank + * @bank: The bank + * + * release a bank previously taken with mtk_thermal_get_bank, + */ +static void mtk_thermal_put_bank(struct mtk_thermal_bank *bank) +{ + struct mtk_thermal *mt = bank->mt; + + mutex_unlock(&mt->lock); +} + +/** + * mtk_thermal_bank_temperature - get the temperature of a bank + * @bank: The bank + * + * The temperature of a bank is considered the maximum temperature of + * the sensors associated to the bank. + */ +static int mtk_thermal_bank_temperature(struct mtk_thermal_bank *bank) +{ + struct mtk_thermal *mt = bank->mt; + int temp, i, max; + u32 raw; + + temp = max = -INT_MAX; + + for (i = 0; i < 4; i++) { + int sensno; + + if (!(bank_data[bank->id].enable_mask & (1 << i))) + continue; + + raw = readl(mt->thermal_base + tempmsr_ofs[i]); + + sensno = bank_data[bank->id].sensors[i]; + temp = raw_to_mcelsius(mt, raw); + + if (temp > max) + max = temp; + } + + return max; +} + +static void mtk_thermal_irq_bank(struct mtk_thermal_bank *bank) +{ + struct mtk_thermal *mt = bank->mt; + int sp; + u32 irqstat; + bool update = false; + + mtk_thermal_get_bank(bank); + + irqstat = readl(mt->thermal_base + TEMPMONINTSTS); + + mtk_thermal_put_bank(bank); + + for (sp = 0; sp < 3; sp++) { + if (irqstat & TEMPMONINT_LOW_OFS(sp)) { + update = true; + dev_vdbg(mt->dev, "bank %d sensor %d low offset interrupt\n", + bank->id, sp); + } + + if (irqstat & TEMPMONINT_HIGH_OFS(sp)) { + update = true; + dev_vdbg(mt->dev, "bank %d sensor %d high offset interrupt\n", + bank->id, sp); + } + } + + if (update) + thermal_zone_device_update(bank->tz); +} + +static irqreturn_t mtk_thermal_irq(int irq, void *dev_id) +{ + struct mtk_thermal *mt = dev_id; + u32 irqstat = 0; + int i; + + irqstat = readl(mt->thermal_base + THERMINTST); + + dev_vdbg(mt->dev, "thermal_interrupt_handler : THERMINTST = 0x%x\n", + irqstat); + + for (i = 0; i < MT8173_NUM_BANKS; i++) { + if (!(irqstat & (1 << i))) + mtk_thermal_irq_bank(&mt->banks[i]); + } + + return IRQ_HANDLED; +} + +static int mtk_read_temp(void *data, int *temp) +{ + struct mtk_thermal_bank *bank = data; + + mtk_thermal_get_bank(bank); + + *temp = mtk_thermal_bank_temperature(bank); + + mtk_thermal_put_bank(bank); + + return 0; +} + +static int mtk_set_trips(void *data, int low, int high) +{ + struct mtk_thermal_bank *bank = data; + struct mtk_thermal *mt = bank->mt; + int i; + u32 val, enable_mask; + u32 raw_low, raw_high; + + raw_low = mcelsius_to_raw(mt, low); + raw_high = mcelsius_to_raw(mt, high); + + mtk_thermal_get_bank(bank); + + writel(0x0, mt->thermal_base + TEMPMONINT); + + writel(TEMPPROTCTL_SELECTED, mt->thermal_base + TEMPPROTCTL); + + writel(raw_low, mt->thermal_base + TEMPOFFSETL); + writel(raw_high, mt->thermal_base + TEMPOFFSETH); + + enable_mask = readl(mt->thermal_base + TEMPMONCTL0); + + val = 0; + for (i = 0; i < MT8173_NUM_SENSING_POINTS; i++) + if (enable_mask & (1 << i)) + val |= TEMPMONINT_LOW_OFS(i) | TEMPMONINT_HIGH_OFS(i); + + writel(val, mt->thermal_base + TEMPMONINT); + + mtk_thermal_put_bank(bank); + + dev_dbg(mt->dev, "new boundaries: %d (0x%04x) < x < %d (0x%04x)\n", + low, mcelsius_to_raw(mt, low), + high, mcelsius_to_raw(mt, high)); + + return 0; +} + +static const struct thermal_zone_of_device_ops mtk_thermal_ops = { + .get_temp = mtk_read_temp, + .set_trips = mtk_set_trips, +}; + +static void mtk_thermal_init_bank(struct mtk_thermal_bank *bank) +{ + struct mtk_thermal *mt = bank->mt; + struct mtk_thermal_bank_cfg *cfg = &bank_data[bank->id]; + int i; + + mtk_thermal_get_bank(bank); + + /* bus clock 66M counting unit is 12 * 15.15ns * 256 = 46.540us */ + writel(0x0000000c, mt->thermal_base + TEMPMONCTL1); + + /* + * filt interval is 1 * 46.540us = 46.54us, + * sen interval is 429 * 46.540us = 19.96ms + */ + writel(0x000101ad, mt->thermal_base + TEMPMONCTL2); + + /* poll is set to 10u */ + writel(0x00000300, mt->thermal_base + TEMPAHBPOLL); + + /* temperature sampling control, 1 sample */ + writel(0x00000000, mt->thermal_base + TEMPMSRCTL0); + + /* exceed this polling time, IRQ would be inserted */ + writel(0xffffffff, mt->thermal_base + TEMPAHBTO); + + /* number of interrupts per event, 1 is enough */ + writel(0x0, mt->thermal_base + TEMPMONIDET0); + writel(0x0, mt->thermal_base + TEMPMONIDET1); + + /* + * The MT8173 thermal controller does not have its own ADC. Instead it + * uses AHB bus accesses to control the AUXADC. To do this the thermal + * controller has to be programmed with the physical addresses of the + * AUXADC registers and with the various bit positions in the AUXADC. + * Also the thermal controller controls a mux in the APMIXEDSYS register + * space. + */ + + /* + * this value will be stored to TEMPPNPMUXADDR (TEMPSPARE0) + * automatically by hw + */ + writel(1 << MT8173_TEMP_AUXADC_CHANNEL, mt->thermal_base + TEMPADCMUX); + + /* AHB address for auxadc mux selection */ + writel(mt->auxadc_phys_base + 0x00c, + mt->thermal_base + TEMPADCMUXADDR); + + /* AHB address for pnp sensor mux selection */ + writel(mt->apmixed_phys_base + 0x0604, + mt->thermal_base + TEMPPNPMUXADDR); + + /* AHB value for auxadc enable */ + writel(1 << MT8173_TEMP_AUXADC_CHANNEL, mt->thermal_base + TEMPADCEN); + + /* AHB address for auxadc enable (channel 0 immediate mode selected) */ + writel(mt->auxadc_phys_base + AUXADC_CON1_SET_V, + mt->thermal_base + TEMPADCENADDR); + + /* AHB address for auxadc valid bit */ + writel(mt->auxadc_phys_base + AUXADC_DATA(MT8173_TEMP_AUXADC_CHANNEL), + mt->thermal_base + TEMPADCVALIDADDR); + + /* AHB address for auxadc voltage output */ + writel(mt->auxadc_phys_base + AUXADC_DATA(MT8173_TEMP_AUXADC_CHANNEL), + mt->thermal_base + TEMPADCVOLTADDR); + + /* read valid & voltage are at the same register */ + writel(0x0, mt->thermal_base + TEMPRDCTRL); + + /* indicate where the valid bit is */ + writel(TEMPADCVALIDMASK_VALID_HIGH | TEMPADCVALIDMASK_VALID_POS(12), + mt->thermal_base + TEMPADCVALIDMASK); + + /* no shift */ + writel(0x0, mt->thermal_base + TEMPADCVOLTAGESHIFT); + + /* enable auxadc mux write transaction */ + writel(TEMPADCWRITECTRL_ADC_MUX_WRITE, + mt->thermal_base + TEMPADCWRITECTRL); + + for (i = 0; i < MT8173_NUM_SENSING_POINTS; i++) + writel(sensor_mux_values[cfg->sensors[i]], + mt->thermal_base + tempadcpnp_ofs[i]); + + writel(cfg->enable_mask, mt->thermal_base + TEMPMONCTL0); + + writel(TEMPADCWRITECTRL_ADC_PNP_WRITE | TEMPADCWRITECTRL_ADC_MUX_WRITE, + mt->thermal_base + TEMPADCWRITECTRL); + + mtk_thermal_put_bank(bank); +} + +static u64 of_get_phys_base(struct device_node *np) +{ + u64 size64; + const __be32 *regaddr_p; + + regaddr_p = of_get_address(np, 0, &size64, NULL); + if (!regaddr_p) + return OF_BAD_ADDR; + + return of_translate_address(np, regaddr_p); +} + +static int mtk_thermal_probe(struct platform_device *pdev) +{ + int ret, i; + struct device_node *auxadc, *apmixedsys, *np = pdev->dev.of_node; + int irq; + struct mtk_thermal *mt; + struct resource *res; + + mt = devm_kzalloc(&pdev->dev, sizeof(*mt), GFP_KERNEL); + if (!mt) + return -ENOMEM; + + mt->clk_peri_therm = devm_clk_get(&pdev->dev, "therm"); + if (IS_ERR(mt->clk_peri_therm)) + return PTR_ERR(mt->clk_peri_therm); + + mt->clk_auxadc = devm_clk_get(&pdev->dev, "auxadc"); + if (IS_ERR(mt->clk_auxadc)) + return PTR_ERR(mt->clk_auxadc); + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + mt->thermal_base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(mt->thermal_base)) + return PTR_ERR(mt->thermal_base); + + mt->reset = devm_reset_control_get(&pdev->dev, "therm"); + if (IS_ERR(mt->reset)) { + ret = PTR_ERR(mt->reset); + dev_err(&pdev->dev, "cannot get reset: %d\n", ret); + return ret; + } + + mutex_init(&mt->lock); + + mt->dev = &pdev->dev; + + auxadc = of_parse_phandle(np, "auxadc", 0); + if (!auxadc) { + dev_err(&pdev->dev, "missing auxadc node\n"); + return -ENODEV; + } + + mt->auxadc_phys_base = of_get_phys_base(auxadc); + if (mt->auxadc_phys_base == OF_BAD_ADDR) { + dev_err(&pdev->dev, "Can't get auxadc phys address\n"); + return -EINVAL; + } + + apmixedsys = of_parse_phandle(np, "apmixedsys", 0); + if (!apmixedsys) { + dev_err(&pdev->dev, "missing apmixedsys node\n"); + return -ENODEV; + } + + mt->apmixed_phys_base = of_get_phys_base(apmixedsys); + if (mt->apmixed_phys_base == OF_BAD_ADDR) { + dev_err(&pdev->dev, "Can't get auxadc phys address\n"); + return -EINVAL; + } + + irq = platform_get_irq(pdev, 0); + if (!irq) { + dev_err(&pdev->dev, "Can't find irq\n"); + return -EINVAL; + } + + ret = devm_request_threaded_irq(&pdev->dev, irq, NULL, mtk_thermal_irq, + IRQF_ONESHOT, THERMAL_NAME, mt); + if (ret) { + dev_err(&pdev->dev, "Can't request irq %d: %d\n", irq, ret); + return ret; + } + + ret = clk_prepare_enable(mt->clk_auxadc); + if (ret) { + dev_err(&pdev->dev, "Can't enable auxadc clk: %d\n", ret); + return ret; + } + + reset_control_reset(mt->reset); + + ret = clk_prepare_enable(mt->clk_peri_therm); + if (ret) { + dev_err(&pdev->dev, "Can't enable peri clk: %d\n", ret); + goto err_enable_clk; + } + + /* + * These calibration values should finally be provided by the + * firmware or fuses. For now use default values. + */ + mt->adc_ge = ((512 - 512) * 10000) / 4096; + mt->adc_oe = 512 - 512; + mt->degc_cali = 40; + mt->o_slope = 0; + mt->vts = 260; + + for (i = 0; i < MT8173_NUM_BANKS; i++) { + struct mtk_thermal_bank *bank = &mt->banks[i]; + + bank->id = i; + bank->mt = mt; + mtk_thermal_init_bank(&mt->banks[i]); + } + + platform_set_drvdata(pdev, mt); + + /* + * This is needed after initialising the banks because otherwise + * the first temperature read contains bogus high temperatures which + * immediately cause a system shutdown. + */ + msleep(100); + + for (i = 0; i < MT8173_NUM_BANKS; i++) { + struct mtk_thermal_bank *bank = &mt->banks[i]; + + bank->tz = thermal_zone_of_sensor_register(&pdev->dev, i, bank, + &mtk_thermal_ops); + } + + return 0; + +err_enable_clk: + clk_disable_unprepare(mt->clk_peri_therm); + + return ret; +} + +static int mtk_thermal_remove(struct platform_device *pdev) +{ + struct mtk_thermal *mt = platform_get_drvdata(pdev); + int i; + + for (i = 0; i < MT8173_NUM_BANKS; i++) { + struct mtk_thermal_bank *bank = &mt->banks[i]; + + if (!IS_ERR(bank)) + thermal_zone_of_sensor_unregister(&pdev->dev, bank->tz); + } + + clk_disable_unprepare(mt->clk_peri_therm); + clk_disable_unprepare(mt->clk_auxadc); + + return 0; +} + +static const struct of_device_id mtk_thermal_of_match[] = { + { + .compatible = "mediatek,mt8173-thermal", + }, { + }, +}; + +static struct platform_driver mtk_thermal_driver = { + .probe = mtk_thermal_probe, + .remove = mtk_thermal_remove, + .driver = { + .name = THERMAL_NAME, + .of_match_table = mtk_thermal_of_match, + }, +}; + +module_platform_driver(mtk_thermal_driver); -- 1.7.10.4