The dra7xx series of SOCs contain a temperature sensor and an associated analog-to-digital converter (ADC) which produces an output which is proportional to the SOC temperature. Add support for this temperature sensor.
Signed-off-by: Faiz Abbas faiz_abbas@ti.com --- v2: 1. Removed extra elements from ti_bandgap 2. Changed base address to ulong 3. Changed to udev to dev to maintain consistency 4. minor format changes
common/spl/Kconfig | 8 + configs/dra7xx_evm_defconfig | 3 + .../thermal/ti_soc_thermal.txt | 35 ++++ drivers/Makefile | 2 +- drivers/thermal/Kconfig | 6 + drivers/thermal/Makefile | 1 + drivers/thermal/ti-bandgap.c | 197 +++++++++++++++++++++ 7 files changed, 251 insertions(+), 1 deletion(-) create mode 100644 doc/device-tree-bindings/thermal/ti_soc_thermal.txt create mode 100644 drivers/thermal/ti-bandgap.c
diff --git a/common/spl/Kconfig b/common/spl/Kconfig index 0bd8370..0bf3ee3 100644 --- a/common/spl/Kconfig +++ b/common/spl/Kconfig @@ -604,6 +604,14 @@ config SPL_SPI_SUPPORT enable SPI drivers that are needed for other purposes also, such as a SPI PMIC.
+config SPL_THERMAL + bool "Driver support for thermal devices" + help + Enable support for temperature-sensing devices. Some SoCs have on-chip + temperature sensors to permit warnings, speed throttling or even + automatic power-off when the temperature gets too high or low. Other + devices may be discrete but connected on a suitable bus. + config SPL_USB_HOST_SUPPORT bool "Support USB host drivers" help diff --git a/configs/dra7xx_evm_defconfig b/configs/dra7xx_evm_defconfig index 468c288..447fb89 100644 --- a/configs/dra7xx_evm_defconfig +++ b/configs/dra7xx_evm_defconfig @@ -90,3 +90,6 @@ CONFIG_USB_GADGET=y CONFIG_USB_GADGET_MANUFACTURER="Texas Instruments" CONFIG_USB_GADGET_VENDOR_NUM=0x0451 CONFIG_USB_GADGET_PRODUCT_NUM=0xd022 +CONFIG_SPL_THERMAL=y +CONFIG_DM_THERMAL=y +CONFIG_TI_DRA7_THERMAL=y diff --git a/doc/device-tree-bindings/thermal/ti_soc_thermal.txt b/doc/device-tree-bindings/thermal/ti_soc_thermal.txt new file mode 100644 index 0000000..b4e88c2 --- /dev/null +++ b/doc/device-tree-bindings/thermal/ti_soc_thermal.txt @@ -0,0 +1,35 @@ +* Texas Instrument dra7xx SCM bandgap bindings + +In the System Control Module, SoC supplies a voltage reference +and a temperature sensor feature that are gathered in the band +gap voltage and temperature sensor (VBGAPTS) module. The band +gap provides current and voltage reference for its internal +circuits and other analog IP blocks. The analog-to-digital +converter (ADC) produces an output value that is proportional +to the silicon temperature. + +Required properties: +- compatible : Should be: + - "ti,dra752-bandgap" +- interrupts : this entry should indicate which interrupt line +the talert signal is routed to; +- regs : this is specific to each bandgap version, because +the mapping may change from soc to soc, apart from depending +on available features. + +Optional: +- gpios : this entry should be used to inform which GPIO +line the tshut signal is routed to. The informed GPIO will +be treated as an IRQ; + +Example: +bandgap { + reg = <0x4a0021e0 0xc + 0x4a00232c 0xc + 0x4a002380 0x2c + 0x4a0023C0 0x3c + 0x4a002564 0x8 + 0x4a002574 0x50>; + compatible = "ti,dra752-bandgap"; + interrupts = <0 126 4>; /* talert */ +}; diff --git a/drivers/Makefile b/drivers/Makefile index dab5c18..35510ca 100644 --- a/drivers/Makefile +++ b/drivers/Makefile @@ -50,7 +50,7 @@ obj-$(CONFIG_SPL_SATA_SUPPORT) += ata/ scsi/ obj-$(CONFIG_SPL_USB_HOST_SUPPORT) += block/ obj-$(CONFIG_SPL_MMC_SUPPORT) += block/ obj-$(CONFIG_SPL_FPGA_SUPPORT) += fpga/ - +obj-$(CONFIG_SPL_THERMAL) += thermal/ endif endif
diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig index 886f5fa..a71b9be 100644 --- a/drivers/thermal/Kconfig +++ b/drivers/thermal/Kconfig @@ -17,4 +17,10 @@ config IMX_THERMAL cpufreq is used as the cooling device to throttle CPUs when the passive trip is crossed.
+config TI_DRA7_THERMAL + bool "Temperature sensor driver for TI dra7xx SOCs" + help + Enable thermal support for for the Texas Instruments DRA752 SoC family. + The driver supports reading CPU temperature. + endif # if DM_THERMAL diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile index d768f5e..f6271a5 100644 --- a/drivers/thermal/Makefile +++ b/drivers/thermal/Makefile @@ -7,3 +7,4 @@
obj-$(CONFIG_DM_THERMAL) += thermal-uclass.o obj-$(CONFIG_IMX_THERMAL) += imx_thermal.o +obj-$(CONFIG_TI_DRA7_THERMAL) += ti-bandgap.o diff --git a/drivers/thermal/ti-bandgap.c b/drivers/thermal/ti-bandgap.c new file mode 100644 index 0000000..6db9f54 --- /dev/null +++ b/drivers/thermal/ti-bandgap.c @@ -0,0 +1,197 @@ +/* + * TI Bandgap temperature sensor driver + * + * Copyright (C) 2017 Texas Instruments Incorporated - http://www.ti.com/ + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation version 2. + * + * This program is distributed "as is" WITHOUT ANY WARRANTY of any + * kind, whether express or implied; without even the implied warranty + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * Taken from Linux v4.9 (drivers/thermal/ti-soc-thermal/ti-bandgap.c) + * and ported to uboot. + * + */ + +#include <asm/io.h> +#include <dm.h> +#include <thermal.h> + +#define CTRL_CORE_TEMP_SENSOR_MPU 0 +#define DRA752_ADC_START_VALUE 540 + +struct ti_bandgap { + ulong base; + int temperature; /* in mili degree celsius */ +}; + +/* + * DRA752 : Temperature values in milli degree celsius + * ADC code values from 540 to 945 + */ +static int dra752_adc_to_temp[] = { + /* Index 540 - 549 */ + -40000, -40000, -40000, -40000, -39800, -39400, -39000, -38600, -38200, + -37800, + /* Index 550 - 559 */ + -37400, -37000, -36600, -36200, -35800, -35300, -34700, -34200, -33800, + -33400, + /* Index 560 - 569 */ + -33000, -32600, -32200, -31800, -31400, -31000, -30600, -30200, -29800, + -29400, + /* Index 570 - 579 */ + -29000, -28600, -28200, -27700, -27100, -26600, -26200, -25800, -25400, + -25000, + /* Index 580 - 589 */ + -24600, -24200, -23800, -23400, -23000, -22600, -22200, -21800, -21400, + -21000, + /* Index 590 - 599 */ + -20500, -19900, -19400, -19000, -18600, -18200, -17800, -17400, -17000, + -16600, + /* Index 600 - 609 */ + -16200, -15800, -15400, -15000, -14600, -14200, -13800, -13400, -13000, + -12500, + /* Index 610 - 619 */ + -11900, -11400, -11000, -10600, -10200, -9800, -9400, -9000, -8600, + -8200, + /* Index 620 - 629 */ + -7800, -7400, -7000, -6600, -6200, -5800, -5400, -5000, -4500, + -3900, + /* Index 630 - 639 */ + -3400, -3000, -2600, -2200, -1800, -1400, -1000, -600, -200, + 200, + /* Index 640 - 649 */ + 600, 1000, 1400, 1800, 2200, 2600, 3000, 3400, 3900, + 4500, + /* Index 650 - 659 */ + 5000, 5400, 5800, 6200, 6600, 7000, 7400, 7800, 8200, + 8600, + /* Index 660 - 669 */ + 9000, 9400, 9800, 10200, 10600, 11000, 11400, 11800, 12200, + 12700, + /* Index 670 - 679 */ + 13300, 13800, 14200, 14600, 15000, 15400, 15800, 16200, 16600, + 17000, + /* Index 680 - 689 */ + 17400, 17800, 18200, 18600, 19000, 19400, 19800, 20200, 20600, + 21000, + /* Index 690 - 699 */ + 21400, 21900, 22500, 23000, 23400, 23800, 24200, 24600, 25000, + 25400, + /* Index 700 - 709 */ + 25800, 26200, 26600, 27000, 27400, 27800, 28200, 28600, 29000, + 29400, + /* Index 710 - 719 */ + 29800, 30200, 30600, 31000, 31400, 31900, 32500, 33000, 33400, + 33800, + /* Index 720 - 729 */ + 34200, 34600, 35000, 35400, 35800, 36200, 36600, 37000, 37400, + 37800, + /* Index 730 - 739 */ + 38200, 38600, 39000, 39400, 39800, 40200, 40600, 41000, 41400, + 41800, + /* Index 740 - 749 */ + 42200, 42600, 43100, 43700, 44200, 44600, 45000, 45400, 45800, + 46200, + /* Index 750 - 759 */ + 46600, 47000, 47400, 47800, 48200, 48600, 49000, 49400, 49800, + 50200, + /* Index 760 - 769 */ + 50600, 51000, 51400, 51800, 52200, 52600, 53000, 53400, 53800, + 54200, + /* Index 770 - 779 */ + 54600, 55000, 55400, 55900, 56500, 57000, 57400, 57800, 58200, + 58600, + /* Index 780 - 789 */ + 59000, 59400, 59800, 60200, 60600, 61000, 61400, 61800, 62200, + 62600, + /* Index 790 - 799 */ + 63000, 63400, 63800, 64200, 64600, 65000, 65400, 65800, 66200, + 66600, + /* Index 800 - 809 */ + 67000, 67400, 67800, 68200, 68600, 69000, 69400, 69800, 70200, + 70600, + /* Index 810 - 819 */ + 71000, 71500, 72100, 72600, 73000, 73400, 73800, 74200, 74600, + 75000, + /* Index 820 - 829 */ + 75400, 75800, 76200, 76600, 77000, 77400, 77800, 78200, 78600, + 79000, + /* Index 830 - 839 */ + 79400, 79800, 80200, 80600, 81000, 81400, 81800, 82200, 82600, + 83000, + /* Index 840 - 849 */ + 83400, 83800, 84200, 84600, 85000, 85400, 85800, 86200, 86600, + 87000, + /* Index 850 - 859 */ + 87400, 87800, 88200, 88600, 89000, 89400, 89800, 90200, 90600, + 91000, + /* Index 860 - 869 */ + 91400, 91800, 92200, 92600, 93000, 93400, 93800, 94200, 94600, + 95000, + /* Index 870 - 879 */ + 95400, 95800, 96200, 96600, 97000, 97500, 98100, 98600, 99000, + 99400, + /* Index 880 - 889 */ + 99800, 100200, 100600, 101000, 101400, 101800, 102200, 102600, 103000, + 103400, + /* Index 890 - 899 */ + 103800, 104200, 104600, 105000, 105400, 105800, 106200, 106600, 107000, + 107400, + /* Index 900 - 909 */ + 107800, 108200, 108600, 109000, 109400, 109800, 110200, 110600, 111000, + 111400, + /* Index 910 - 919 */ + 111800, 112200, 112600, 113000, 113400, 113800, 114200, 114600, 115000, + 115400, + /* Index 920 - 929 */ + 115800, 116200, 116600, 117000, 117400, 117800, 118200, 118600, 119000, + 119400, + /* Index 930 - 939 */ + 119800, 120200, 120600, 121000, 121400, 121800, 122200, 122600, 123000, + 123400, + /* Index 940 - 945 */ + 123800, 124200, 124600, 124900, 125000, 125000, +}; + +static int ti_bandgap_get_temp(struct udevice *dev, int *temp) +{ + struct ti_bandgap *bgp = dev_get_priv(dev); + + bgp->temperature = 0x3ff & readl(bgp->base + CTRL_CORE_TEMP_SENSOR_MPU); + *temp = dra752_adc_to_temp[bgp->temperature - DRA752_ADC_START_VALUE]; + + return 0; +} + +static struct dm_thermal_ops ti_thermal_ops = { + .get_temp = ti_bandgap_get_temp, +}; + +static int ti_bandgap_probe(struct udevice *dev) +{ + struct ti_bandgap *bgp = dev_get_priv(dev); + + bgp->base = devfdt_get_addr_index(dev, 1); + + return 0; +} + +static const struct udevice_id of_ti_bandgap_match[] = { + { + .compatible = "ti,dra752-bandgap", + }, +}; + +U_BOOT_DRIVER(ti_bandgap_thermal) = { + .name = "ti_bandgap_thermal", + .id = UCLASS_THERMAL, + .ops = &ti_thermal_ops, + .probe = ti_bandgap_probe, + .of_match = of_ti_bandgap_match, + .priv_auto_alloc_size = sizeof(struct ti_bandgap), +};