Commit 9c5c87e5 authored by Pavel Machek's avatar Pavel Machek Committed by Eduardo Valentin
Browse files

ti-soc-thermal: implement omap3 support 



This adds support for OMAP3 chips to ti-soc-thermal. As requested by
TI people, it is marked unreliable and warning is printed.

Signed-off-by: default avatarPavel Machek <pavel@ucw.cz>
Signed-off-by: default avatarEduardo Valentin <edubezval@gmail.com>
parent 3225031f

Documentation/devicetree/bindings/thermal/ti_soc_thermal.txt

+7 −0
Original line number Diff line number Diff line
@@ -10,6 +10,7 @@ to the silicon temperature. 


Required properties:

- compatible : Should be:

  - "ti,omap34xx-bandgap" : for OMAP34xx bandgap

  - "ti,omap4430-bandgap" : for OMAP4430 bandgap

  - "ti,omap4460-bandgap" : for OMAP4460 bandgap

  - "ti,omap4470-bandgap" : for OMAP4470 bandgap
@@ -25,6 +26,12 @@ to each bandgap version, because the mapping may change from 
soc to soc, apart of depending on available features.



Example:

OMAP34xx:

bandgap {

	reg = <0x48002524 0x4>;

	compatible = "ti,omap34xx-bandgap";

};



OMAP4430:

bandgap {

	reg = <0x4a002260 0x4 0x4a00232C 0x4>;

drivers/thermal/ti-soc-thermal/Kconfig

+15 −0
Original line number Diff line number Diff line
@@ -19,6 +19,21 @@ config TI_THERMAL 
	  This includes trip points definitions, extrapolation rules and

	  CPU cooling device bindings.



config OMAP3_THERMAL

	bool "Texas Instruments OMAP3 thermal support"

	depends on TI_SOC_THERMAL

	depends on ARCH_OMAP3 || COMPILE_TEST

	help

	  If you say yes here you get thermal support for the Texas Instruments

	  OMAP3 SoC family. The current chips supported are:

	   - OMAP3430



	  OMAP3 chips normally don't need thermal management, and sensors in

	  this generation are not accurate, nor they are very close to

	  the important hotspots.



	  Say 'N' here.



config OMAP4_THERMAL

	bool "Texas Instruments OMAP4 thermal support"

	depends on TI_SOC_THERMAL

drivers/thermal/ti-soc-thermal/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -2,5 +2,6 @@ obj-$(CONFIG_TI_SOC_THERMAL) += ti-soc-thermal.o 
ti-soc-thermal-y			:= ti-bandgap.o

ti-soc-thermal-$(CONFIG_TI_THERMAL)	+= ti-thermal-common.o

ti-soc-thermal-$(CONFIG_DRA752_THERMAL)	+= dra752-thermal-data.o

ti-soc-thermal-$(CONFIG_OMAP3_THERMAL)	+= omap3-thermal-data.o

ti-soc-thermal-$(CONFIG_OMAP4_THERMAL)	+= omap4-thermal-data.o

ti-soc-thermal-$(CONFIG_OMAP5_THERMAL)	+= omap5-thermal-data.o

drivers/thermal/ti-soc-thermal/omap3-thermal-data.c

0 → 100644
+103 −0
Original line number Diff line number Diff line 
/*

 * OMAP3 thermal driver.

 *

 * Copyright (C) 2011-2012 Texas Instruments Inc.

 * Copyright (C) 2014 Pavel Machek <pavel@ucw.cz>

 *

 * This software is licensed under the terms of the GNU General Public

 * License version 2, as published by the Free Software Foundation, and

 * may be copied, distributed, and modified under those terms.

 *

 * 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.

 *

 * Note

 * http://www.ti.com/lit/er/sprz278f/sprz278f.pdf "Advisory

 * 3.1.1.186 MMC OCP Clock Not Gated When Thermal Sensor Is Used"

 *

 * Also TI says:

 * Just be careful when you try to make thermal policy like decisions

 * based on this sensor. Placement of the sensor w.r.t the actual logic

 * generating heat has to be a factor as well. If you are just looking

 * for an approximation temperature (thermometerish kind), you might be

 * ok with this. I am not sure we'd find any TI data around this.. just a

 * heads up.

 */



#include "ti-thermal.h"

#include "ti-bandgap.h"



/*

 * OMAP34XX has one instance of thermal sensor for MPU

 * need to describe the individual bit fields

 */

static struct temp_sensor_registers

omap34xx_mpu_temp_sensor_registers = {

	.temp_sensor_ctrl = 0,

	.bgap_soc_mask = BIT(8),

	.bgap_eocz_mask = BIT(7),

	.bgap_dtemp_mask = 0x7f,



	.bgap_mode_ctrl = 0,

	.mode_ctrl_mask = BIT(9),

};



/* Thresholds and limits for OMAP34XX MPU temperature sensor */

static struct temp_sensor_data omap34xx_mpu_temp_sensor_data = {

	.min_freq = 32768,

	.max_freq = 32768,

	.max_temp = 125000,

	.min_temp = -40000,

	.hyst_val = 5000,

};



/*

 * Temperature values in milli degree celsius

 */

static const int

omap34xx_adc_to_temp[128] = {

	-40000, -40000, -40000, -40000, -40000, -39000, -38000, -36000,

	-34000, -32000, -31000,	-29000, -28000, -26000, -25000, -24000,

	-22000, -21000, -19000, -18000, -17000, -15000,	-14000, -12000,

	-11000, -9000, -8000, -7000, -5000, -4000, -2000, -1000, 0000,

	1000, 3000, 4000, 5000, 7000, 8000, 10000, 11000, 13000, 14000,

	15000, 17000, 18000, 20000, 21000, 22000, 24000, 25000, 27000,

	28000, 30000, 31000, 32000, 34000, 35000, 37000, 38000, 39000,

	41000, 42000, 44000, 45000, 47000, 48000, 49000, 51000, 52000,

	53000, 55000, 56000, 58000, 59000, 60000, 62000, 63000, 65000,

	66000, 67000, 69000, 70000, 72000, 73000, 74000, 76000, 77000,

	79000, 80000, 81000, 83000, 84000, 85000, 87000, 88000, 89000,

	91000, 92000, 94000, 95000, 96000, 98000, 99000, 100000,

	102000, 103000, 105000, 106000, 107000, 109000, 110000, 111000,

	113000, 114000, 116000, 117000, 118000, 120000, 121000, 122000,

	124000, 124000, 125000, 125000, 125000, 125000,	125000

};



/* OMAP34XX data */

const struct ti_bandgap_data omap34xx_data = {

	.features = TI_BANDGAP_FEATURE_CLK_CTRL | TI_BANDGAP_FEATURE_UNRELIABLE,

	.fclock_name = "ts_fck",

	.div_ck_name = "ts_fck",

	.conv_table = omap34xx_adc_to_temp,

	.adc_start_val = 0,

	.adc_end_val = 127,

	.expose_sensor = ti_thermal_expose_sensor,

	.remove_sensor = ti_thermal_remove_sensor,



	.sensors = {

		{

		.registers = &omap34xx_mpu_temp_sensor_registers,

		.ts_data = &omap34xx_mpu_temp_sensor_data,

		.domain = "cpu",

		.slope = 0,

		.constant = 20000,

		.slope_pcb = 0,

		.constant_pcb = 20000,

		.register_cooling = NULL,

		.unregister_cooling = NULL,

		},

	},

	.sensor_count = 1,

};

drivers/thermal/ti-soc-thermal/ti-bandgap.c

+10 −0
Original line number Diff line number Diff line
@@ -1274,6 +1274,10 @@ int ti_bandgap_probe(struct platform_device *pdev) 
	}

	bgp->dev = &pdev->dev;



	if (TI_BANDGAP_HAS(bgp, UNRELIABLE))

		dev_warn(&pdev->dev,

			 "This OMAP thermal sensor is unreliable. You've been warned\n");



	if (TI_BANDGAP_HAS(bgp, TSHUT)) {

		ret = ti_bandgap_tshut_init(bgp, pdev);

		if (ret) {
@@ -1579,6 +1583,12 @@ static SIMPLE_DEV_PM_OPS(ti_bandgap_dev_pm_ops, ti_bandgap_suspend, 
#endif



static const struct of_device_id of_ti_bandgap_match[] = {

#ifdef CONFIG_OMAP3_THERMAL

	{

		.compatible = "ti,omap34xx-bandgap",

		.data = (void *)&omap34xx_data,

	},

#endif

#ifdef CONFIG_OMAP4_THERMAL

	{

		.compatible = "ti,omap4430-bandgap",