[PATCH 15/16] thermal: Add Mediatek thermal controller support
Sascha Hauer
s.hauer at pengutronix.de
Wed May 20 06:20:45 PDT 2015
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 <s.hauer at pengutronix.de>
---
drivers/thermal/Kconfig | 8 +
drivers/thermal/Makefile | 1 +
drivers/thermal/mtk_thermal.c | 723 ++++++++++++++++++++++++++++++++++++++++++
3 files changed, 732 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..f3c1753
--- /dev/null
+++ b/drivers/thermal/mtk_thermal.c
@@ -0,0 +1,723 @@
+/*
+ * Copyright (c) 2014 MediaTek Inc.
+ * Author: Hanyi.Wu <hanyi.wu at mediatek.com>
+ *
+ * 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 <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/dmi.h>
+#include <linux/thermal.h>
+#include <linux/platform_device.h>
+#include <linux/types.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/clk.h>
+#include <linux/time.h>
+#include <linux/of.h>
+#include <linux/of_irq.h>
+#include <linux/of_address.h>
+#include <linux/interrupt.h>
+#include <linux/reset.h>
+
+/* 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 < MT8173_NUM_SENSING_POINTS; 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;
+ u32 irqstat;
+
+ mtk_thermal_get_bank(bank);
+
+ irqstat = readl(mt->thermal_base + TEMPMONINTSTS);
+
+ mtk_thermal_put_bank(bank);
+
+ 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;
+
+ /*
+ * Broaden the range a little bit to make sure that the raw values that
+ * generate the interrupt converted back to mCelsius are really outside
+ * the desired range.
+ */
+ low -= 500;
+ high += 500;
+
+ 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);
+
+MODULE_AUTHOR("Sascha Hauer <s.hauer at pengutronix.de");
+MODULE_DESCRIPTION("Mediatek thermal driver");
+MODULE_LICENSE("GPL v2");
--
2.1.4
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