1641 lines
42 KiB
C
1641 lines
42 KiB
C
/*
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* TI Bandgap temperature sensor driver
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*
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* Copyright (C) 2011-2012 Texas Instruments Incorporated - http://www.ti.com/
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* Author: J Keerthy <j-keerthy@ti.com>
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* Author: Moiz Sonasath <m-sonasath@ti.com>
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* Couple of fixes, DT and MFD adaptation:
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* Eduardo Valentin <eduardo.valentin@ti.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*
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*/
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#include <linux/module.h>
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#include <linux/export.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/interrupt.h>
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#include <linux/clk.h>
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#include <linux/gpio.h>
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#include <linux/platform_device.h>
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#include <linux/err.h>
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#include <linux/types.h>
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#include <linux/spinlock.h>
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#include <linux/reboot.h>
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#include <linux/of_device.h>
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#include <linux/of_platform.h>
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#include <linux/of_irq.h>
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#include <linux/of_gpio.h>
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#include <linux/io.h>
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#include "ti-bandgap.h"
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static int ti_bandgap_force_single_read(struct ti_bandgap *bgp, int id);
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/*** Helper functions to access registers and their bitfields ***/
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/**
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* ti_bandgap_readl() - simple read helper function
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* @bgp: pointer to ti_bandgap structure
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* @reg: desired register (offset) to be read
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*
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* Helper function to read bandgap registers. It uses the io remapped area.
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* Return: the register value.
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*/
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static u32 ti_bandgap_readl(struct ti_bandgap *bgp, u32 reg)
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{
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return readl(bgp->base + reg);
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}
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/**
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* ti_bandgap_writel() - simple write helper function
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* @bgp: pointer to ti_bandgap structure
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* @val: desired register value to be written
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* @reg: desired register (offset) to be written
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*
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* Helper function to write bandgap registers. It uses the io remapped area.
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*/
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static void ti_bandgap_writel(struct ti_bandgap *bgp, u32 val, u32 reg)
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{
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writel(val, bgp->base + reg);
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}
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/**
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* DOC: macro to update bits.
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*
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* RMW_BITS() - used to read, modify and update bandgap bitfields.
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* The value passed will be shifted.
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*/
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#define RMW_BITS(bgp, id, reg, mask, val) \
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do { \
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struct temp_sensor_registers *t; \
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u32 r; \
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\
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t = bgp->conf->sensors[(id)].registers; \
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r = ti_bandgap_readl(bgp, t->reg); \
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r &= ~t->mask; \
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r |= (val) << __ffs(t->mask); \
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ti_bandgap_writel(bgp, r, t->reg); \
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} while (0)
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/*** Basic helper functions ***/
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/**
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* ti_bandgap_power() - controls the power state of a bandgap device
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* @bgp: pointer to ti_bandgap structure
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* @on: desired power state (1 - on, 0 - off)
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*
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* Used to power on/off a bandgap device instance. Only used on those
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* that features tempsoff bit.
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*
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* Return: 0 on success, -ENOTSUPP if tempsoff is not supported.
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*/
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static int ti_bandgap_power(struct ti_bandgap *bgp, bool on)
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{
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int i;
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if (!TI_BANDGAP_HAS(bgp, POWER_SWITCH))
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return -ENOTSUPP;
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for (i = 0; i < bgp->conf->sensor_count; i++)
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/* active on 0 */
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RMW_BITS(bgp, i, temp_sensor_ctrl, bgap_tempsoff_mask, !on);
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return 0;
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}
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/**
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* ti_errata814_bandgap_read_temp() - helper function to read dra7 sensor temperature
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* @bgp: pointer to ti_bandgap structure
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* @reg: desired register (offset) to be read
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*
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* Function to read dra7 bandgap sensor temperature. This is done separately
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* so as to workaround the errata "Bandgap Temperature read Dtemp can be
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* corrupted" - Errata ID: i814".
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* Read accesses to registers listed below can be corrupted due to incorrect
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* resynchronization between clock domains.
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* Read access to registers below can be corrupted :
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* CTRL_CORE_DTEMP_MPU/GPU/CORE/DSPEVE/IVA_n (n = 0 to 4)
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* CTRL_CORE_TEMP_SENSOR_MPU/GPU/CORE/DSPEVE/IVA_n
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*
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* Return: the register value.
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*/
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static u32 ti_errata814_bandgap_read_temp(struct ti_bandgap *bgp, u32 reg)
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{
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u32 val1, val2;
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val1 = ti_bandgap_readl(bgp, reg);
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val2 = ti_bandgap_readl(bgp, reg);
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/* If both times we read the same value then that is right */
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if (val1 == val2)
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return val1;
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/* if val1 and val2 are different read it third time */
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return ti_bandgap_readl(bgp, reg);
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}
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/**
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* ti_bandgap_read_temp() - helper function to read sensor temperature
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* @bgp: pointer to ti_bandgap structure
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* @id: bandgap sensor id
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*
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* Function to concentrate the steps to read sensor temperature register.
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* This function is desired because, depending on bandgap device version,
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* it might be needed to freeze the bandgap state machine, before fetching
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* the register value.
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*
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* Return: temperature in ADC values.
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*/
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static u32 ti_bandgap_read_temp(struct ti_bandgap *bgp, int id)
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{
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struct temp_sensor_registers *tsr;
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u32 temp, reg;
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tsr = bgp->conf->sensors[id].registers;
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reg = tsr->temp_sensor_ctrl;
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if (TI_BANDGAP_HAS(bgp, FREEZE_BIT)) {
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RMW_BITS(bgp, id, bgap_mask_ctrl, mask_freeze_mask, 1);
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/*
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* In case we cannot read from cur_dtemp / dtemp_0,
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* then we read from the last valid temp read
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*/
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reg = tsr->ctrl_dtemp_1;
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}
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/* read temperature */
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if (TI_BANDGAP_HAS(bgp, ERRATA_814))
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temp = ti_errata814_bandgap_read_temp(bgp, reg);
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else
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temp = ti_bandgap_readl(bgp, reg);
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temp &= tsr->bgap_dtemp_mask;
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if (TI_BANDGAP_HAS(bgp, FREEZE_BIT))
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RMW_BITS(bgp, id, bgap_mask_ctrl, mask_freeze_mask, 0);
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return temp;
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}
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/*** IRQ handlers ***/
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/**
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* ti_bandgap_talert_irq_handler() - handles Temperature alert IRQs
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* @irq: IRQ number
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* @data: private data (struct ti_bandgap *)
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*
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* This is the Talert handler. Use it only if bandgap device features
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* HAS(TALERT). This handler goes over all sensors and checks their
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* conditions and acts accordingly. In case there are events pending,
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* it will reset the event mask to wait for the opposite event (next event).
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* Every time there is a new event, it will be reported to thermal layer.
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*
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* Return: IRQ_HANDLED
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*/
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static irqreturn_t ti_bandgap_talert_irq_handler(int irq, void *data)
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{
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struct ti_bandgap *bgp = data;
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struct temp_sensor_registers *tsr;
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u32 t_hot = 0, t_cold = 0, ctrl;
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int i;
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spin_lock(&bgp->lock);
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for (i = 0; i < bgp->conf->sensor_count; i++) {
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tsr = bgp->conf->sensors[i].registers;
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ctrl = ti_bandgap_readl(bgp, tsr->bgap_status);
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/* Read the status of t_hot */
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t_hot = ctrl & tsr->status_hot_mask;
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/* Read the status of t_cold */
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t_cold = ctrl & tsr->status_cold_mask;
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if (!t_cold && !t_hot)
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continue;
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ctrl = ti_bandgap_readl(bgp, tsr->bgap_mask_ctrl);
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/*
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* One TALERT interrupt: Two sources
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* If the interrupt is due to t_hot then mask t_hot and
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* and unmask t_cold else mask t_cold and unmask t_hot
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*/
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if (t_hot) {
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ctrl &= ~tsr->mask_hot_mask;
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ctrl |= tsr->mask_cold_mask;
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} else if (t_cold) {
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ctrl &= ~tsr->mask_cold_mask;
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ctrl |= tsr->mask_hot_mask;
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}
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ti_bandgap_writel(bgp, ctrl, tsr->bgap_mask_ctrl);
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dev_dbg(bgp->dev,
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"%s: IRQ from %s sensor: hotevent %d coldevent %d\n",
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__func__, bgp->conf->sensors[i].domain,
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t_hot, t_cold);
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/* report temperature to whom may concern */
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if (bgp->conf->report_temperature)
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bgp->conf->report_temperature(bgp, i);
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}
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spin_unlock(&bgp->lock);
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return IRQ_HANDLED;
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}
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/**
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* ti_bandgap_tshut_irq_handler() - handles Temperature shutdown signal
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* @irq: IRQ number
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* @data: private data (unused)
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*
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* This is the Tshut handler. Use it only if bandgap device features
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* HAS(TSHUT). If any sensor fires the Tshut signal, we simply shutdown
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* the system.
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*
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* Return: IRQ_HANDLED
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*/
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static irqreturn_t ti_bandgap_tshut_irq_handler(int irq, void *data)
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{
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pr_emerg("%s: TSHUT temperature reached. Needs shut down...\n",
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__func__);
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orderly_poweroff(true);
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return IRQ_HANDLED;
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}
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/*** Helper functions which manipulate conversion ADC <-> mi Celsius ***/
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/**
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* ti_bandgap_adc_to_mcelsius() - converts an ADC value to mCelsius scale
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* @bgp: struct ti_bandgap pointer
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* @adc_val: value in ADC representation
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* @t: address where to write the resulting temperature in mCelsius
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*
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* Simple conversion from ADC representation to mCelsius. In case the ADC value
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* is out of the ADC conv table range, it returns -ERANGE, 0 on success.
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* The conversion table is indexed by the ADC values.
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*
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* Return: 0 if conversion was successful, else -ERANGE in case the @adc_val
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* argument is out of the ADC conv table range.
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*/
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static
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int ti_bandgap_adc_to_mcelsius(struct ti_bandgap *bgp, int adc_val, int *t)
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{
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const struct ti_bandgap_data *conf = bgp->conf;
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/* look up for temperature in the table and return the temperature */
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if (adc_val < conf->adc_start_val || adc_val > conf->adc_end_val)
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return -ERANGE;
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*t = bgp->conf->conv_table[adc_val - conf->adc_start_val];
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return 0;
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}
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/**
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* ti_bandgap_mcelsius_to_adc() - converts a mCelsius value to ADC scale
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* @bgp: struct ti_bandgap pointer
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* @temp: value in mCelsius
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* @adc: address where to write the resulting temperature in ADC representation
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*
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* Simple conversion from mCelsius to ADC values. In case the temp value
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* is out of the ADC conv table range, it returns -ERANGE, 0 on success.
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* The conversion table is indexed by the ADC values.
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*
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* Return: 0 if conversion was successful, else -ERANGE in case the @temp
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* argument is out of the ADC conv table range.
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*/
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static
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int ti_bandgap_mcelsius_to_adc(struct ti_bandgap *bgp, long temp, int *adc)
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{
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const struct ti_bandgap_data *conf = bgp->conf;
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const int *conv_table = bgp->conf->conv_table;
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int high, low, mid;
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low = 0;
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high = conf->adc_end_val - conf->adc_start_val;
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mid = (high + low) / 2;
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if (temp < conv_table[low] || temp > conv_table[high])
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return -ERANGE;
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while (low < high) {
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if (temp < conv_table[mid])
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high = mid - 1;
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else
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low = mid + 1;
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mid = (low + high) / 2;
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}
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*adc = conf->adc_start_val + low;
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return 0;
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}
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/**
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* ti_bandgap_add_hyst() - add hysteresis (in mCelsius) to an ADC value
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* @bgp: struct ti_bandgap pointer
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* @adc_val: temperature value in ADC representation
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* @hyst_val: hysteresis value in mCelsius
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* @sum: address where to write the resulting temperature (in ADC scale)
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*
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* Adds an hysteresis value (in mCelsius) to a ADC temperature value.
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*
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* Return: 0 on success, -ERANGE otherwise.
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*/
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static
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int ti_bandgap_add_hyst(struct ti_bandgap *bgp, int adc_val, int hyst_val,
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u32 *sum)
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{
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int temp, ret;
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/*
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* Need to add in the mcelsius domain, so we have a temperature
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* the conv_table range
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*/
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ret = ti_bandgap_adc_to_mcelsius(bgp, adc_val, &temp);
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if (ret < 0)
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return ret;
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temp += hyst_val;
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ret = ti_bandgap_mcelsius_to_adc(bgp, temp, sum);
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return ret;
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}
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/*** Helper functions handling device Alert/Shutdown signals ***/
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/**
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* ti_bandgap_unmask_interrupts() - unmasks the events of thot & tcold
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* @bgp: struct ti_bandgap pointer
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* @id: bandgap sensor id
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* @t_hot: hot temperature value to trigger alert signal
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* @t_cold: cold temperature value to trigger alert signal
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*
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* Checks the requested t_hot and t_cold values and configures the IRQ event
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* masks accordingly. Call this function only if bandgap features HAS(TALERT).
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*/
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static void ti_bandgap_unmask_interrupts(struct ti_bandgap *bgp, int id,
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u32 t_hot, u32 t_cold)
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{
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struct temp_sensor_registers *tsr;
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u32 temp, reg_val;
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/* Read the current on die temperature */
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temp = ti_bandgap_read_temp(bgp, id);
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tsr = bgp->conf->sensors[id].registers;
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reg_val = ti_bandgap_readl(bgp, tsr->bgap_mask_ctrl);
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if (temp < t_hot)
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reg_val |= tsr->mask_hot_mask;
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else
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reg_val &= ~tsr->mask_hot_mask;
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if (t_cold < temp)
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reg_val |= tsr->mask_cold_mask;
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else
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reg_val &= ~tsr->mask_cold_mask;
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ti_bandgap_writel(bgp, reg_val, tsr->bgap_mask_ctrl);
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}
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/**
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* ti_bandgap_update_alert_threshold() - sequence to update thresholds
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* @bgp: struct ti_bandgap pointer
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* @id: bandgap sensor id
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* @val: value (ADC) of a new threshold
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* @hot: desired threshold to be updated. true if threshold hot, false if
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* threshold cold
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*
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* It will program the required thresholds (hot and cold) for TALERT signal.
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* This function can be used to update t_hot or t_cold, depending on @hot value.
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* It checks the resulting t_hot and t_cold values, based on the new passed @val
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* and configures the thresholds so that t_hot is always greater than t_cold.
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* Call this function only if bandgap features HAS(TALERT).
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*
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* Return: 0 if no error, else corresponding error
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*/
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static int ti_bandgap_update_alert_threshold(struct ti_bandgap *bgp, int id,
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int val, bool hot)
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{
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struct temp_sensor_data *ts_data = bgp->conf->sensors[id].ts_data;
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struct temp_sensor_registers *tsr;
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u32 thresh_val, reg_val, t_hot, t_cold, ctrl;
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int err = 0;
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tsr = bgp->conf->sensors[id].registers;
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/* obtain the current value */
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thresh_val = ti_bandgap_readl(bgp, tsr->bgap_threshold);
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t_cold = (thresh_val & tsr->threshold_tcold_mask) >>
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__ffs(tsr->threshold_tcold_mask);
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t_hot = (thresh_val & tsr->threshold_thot_mask) >>
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__ffs(tsr->threshold_thot_mask);
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if (hot)
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t_hot = val;
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else
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t_cold = val;
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if (t_cold > t_hot) {
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if (hot)
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err = ti_bandgap_add_hyst(bgp, t_hot,
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-ts_data->hyst_val,
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&t_cold);
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else
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err = ti_bandgap_add_hyst(bgp, t_cold,
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ts_data->hyst_val,
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&t_hot);
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}
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/* write the new threshold values */
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reg_val = thresh_val &
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~(tsr->threshold_thot_mask | tsr->threshold_tcold_mask);
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reg_val |= (t_hot << __ffs(tsr->threshold_thot_mask)) |
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(t_cold << __ffs(tsr->threshold_tcold_mask));
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/**
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* Errata i813:
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* Spurious Thermal Alert: Talert can happen randomly while the device
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* remains under the temperature limit defined for this event to trig.
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* This spurious event is caused by a incorrect re-synchronization
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* between clock domains. The comparison between configured threshold
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* and current temperature value can happen while the value is
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* transitioning (metastable), thus causing inappropriate event
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* generation. No spurious event occurs as long as the threshold value
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* stays unchanged. Spurious event can be generated while a thermal
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* alert threshold is modified in
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* CONTROL_BANDGAP_THRESHOLD_MPU/GPU/CORE/DSPEVE/IVA_n.
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*/
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if (TI_BANDGAP_HAS(bgp, ERRATA_813)) {
|
|
/* Mask t_hot and t_cold events at the IP Level */
|
|
ctrl = ti_bandgap_readl(bgp, tsr->bgap_mask_ctrl);
|
|
|
|
if (hot)
|
|
ctrl &= ~tsr->mask_hot_mask;
|
|
else
|
|
ctrl &= ~tsr->mask_cold_mask;
|
|
|
|
ti_bandgap_writel(bgp, ctrl, tsr->bgap_mask_ctrl);
|
|
}
|
|
|
|
/* Write the threshold value */
|
|
ti_bandgap_writel(bgp, reg_val, tsr->bgap_threshold);
|
|
|
|
if (TI_BANDGAP_HAS(bgp, ERRATA_813)) {
|
|
/* Unmask t_hot and t_cold events at the IP Level */
|
|
ctrl = ti_bandgap_readl(bgp, tsr->bgap_mask_ctrl);
|
|
if (hot)
|
|
ctrl |= tsr->mask_hot_mask;
|
|
else
|
|
ctrl |= tsr->mask_cold_mask;
|
|
|
|
ti_bandgap_writel(bgp, ctrl, tsr->bgap_mask_ctrl);
|
|
}
|
|
|
|
if (err) {
|
|
dev_err(bgp->dev, "failed to reprogram thot threshold\n");
|
|
err = -EIO;
|
|
goto exit;
|
|
}
|
|
|
|
ti_bandgap_unmask_interrupts(bgp, id, t_hot, t_cold);
|
|
exit:
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* ti_bandgap_validate() - helper to check the sanity of a struct ti_bandgap
|
|
* @bgp: struct ti_bandgap pointer
|
|
* @id: bandgap sensor id
|
|
*
|
|
* Checks if the bandgap pointer is valid and if the sensor id is also
|
|
* applicable.
|
|
*
|
|
* Return: 0 if no errors, -EINVAL for invalid @bgp pointer or -ERANGE if
|
|
* @id cannot index @bgp sensors.
|
|
*/
|
|
static inline int ti_bandgap_validate(struct ti_bandgap *bgp, int id)
|
|
{
|
|
if (!bgp || IS_ERR(bgp)) {
|
|
pr_err("%s: invalid bandgap pointer\n", __func__);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if ((id < 0) || (id >= bgp->conf->sensor_count)) {
|
|
dev_err(bgp->dev, "%s: sensor id out of range (%d)\n",
|
|
__func__, id);
|
|
return -ERANGE;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* _ti_bandgap_write_threshold() - helper to update TALERT t_cold or t_hot
|
|
* @bgp: struct ti_bandgap pointer
|
|
* @id: bandgap sensor id
|
|
* @val: value (mCelsius) of a new threshold
|
|
* @hot: desired threshold to be updated. true if threshold hot, false if
|
|
* threshold cold
|
|
*
|
|
* It will update the required thresholds (hot and cold) for TALERT signal.
|
|
* This function can be used to update t_hot or t_cold, depending on @hot value.
|
|
* Validates the mCelsius range and update the requested threshold.
|
|
* Call this function only if bandgap features HAS(TALERT).
|
|
*
|
|
* Return: 0 if no error, else corresponding error value.
|
|
*/
|
|
static int _ti_bandgap_write_threshold(struct ti_bandgap *bgp, int id, int val,
|
|
bool hot)
|
|
{
|
|
struct temp_sensor_data *ts_data;
|
|
struct temp_sensor_registers *tsr;
|
|
u32 adc_val;
|
|
int ret;
|
|
|
|
ret = ti_bandgap_validate(bgp, id);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (!TI_BANDGAP_HAS(bgp, TALERT))
|
|
return -ENOTSUPP;
|
|
|
|
ts_data = bgp->conf->sensors[id].ts_data;
|
|
tsr = bgp->conf->sensors[id].registers;
|
|
if (hot) {
|
|
if (val < ts_data->min_temp + ts_data->hyst_val)
|
|
ret = -EINVAL;
|
|
} else {
|
|
if (val > ts_data->max_temp + ts_data->hyst_val)
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = ti_bandgap_mcelsius_to_adc(bgp, val, &adc_val);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
spin_lock(&bgp->lock);
|
|
ret = ti_bandgap_update_alert_threshold(bgp, id, adc_val, hot);
|
|
spin_unlock(&bgp->lock);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* _ti_bandgap_read_threshold() - helper to read TALERT t_cold or t_hot
|
|
* @bgp: struct ti_bandgap pointer
|
|
* @id: bandgap sensor id
|
|
* @val: value (mCelsius) of a threshold
|
|
* @hot: desired threshold to be read. true if threshold hot, false if
|
|
* threshold cold
|
|
*
|
|
* It will fetch the required thresholds (hot and cold) for TALERT signal.
|
|
* This function can be used to read t_hot or t_cold, depending on @hot value.
|
|
* Call this function only if bandgap features HAS(TALERT).
|
|
*
|
|
* Return: 0 if no error, -ENOTSUPP if it has no TALERT support, or the
|
|
* corresponding error value if some operation fails.
|
|
*/
|
|
static int _ti_bandgap_read_threshold(struct ti_bandgap *bgp, int id,
|
|
int *val, bool hot)
|
|
{
|
|
struct temp_sensor_registers *tsr;
|
|
u32 temp, mask;
|
|
int ret = 0;
|
|
|
|
ret = ti_bandgap_validate(bgp, id);
|
|
if (ret)
|
|
goto exit;
|
|
|
|
if (!TI_BANDGAP_HAS(bgp, TALERT)) {
|
|
ret = -ENOTSUPP;
|
|
goto exit;
|
|
}
|
|
|
|
tsr = bgp->conf->sensors[id].registers;
|
|
if (hot)
|
|
mask = tsr->threshold_thot_mask;
|
|
else
|
|
mask = tsr->threshold_tcold_mask;
|
|
|
|
temp = ti_bandgap_readl(bgp, tsr->bgap_threshold);
|
|
temp = (temp & mask) >> __ffs(mask);
|
|
ret = ti_bandgap_adc_to_mcelsius(bgp, temp, &temp);
|
|
if (ret) {
|
|
dev_err(bgp->dev, "failed to read thot\n");
|
|
ret = -EIO;
|
|
goto exit;
|
|
}
|
|
|
|
*val = temp;
|
|
|
|
exit:
|
|
return ret;
|
|
}
|
|
|
|
/*** Exposed APIs ***/
|
|
|
|
/**
|
|
* ti_bandgap_read_thot() - reads sensor current thot
|
|
* @bgp: pointer to bandgap instance
|
|
* @id: sensor id
|
|
* @thot: resulting current thot value
|
|
*
|
|
* Return: 0 on success or the proper error code
|
|
*/
|
|
int ti_bandgap_read_thot(struct ti_bandgap *bgp, int id, int *thot)
|
|
{
|
|
return _ti_bandgap_read_threshold(bgp, id, thot, true);
|
|
}
|
|
|
|
/**
|
|
* ti_bandgap_write_thot() - sets sensor current thot
|
|
* @bgp: pointer to bandgap instance
|
|
* @id: sensor id
|
|
* @val: desired thot value
|
|
*
|
|
* Return: 0 on success or the proper error code
|
|
*/
|
|
int ti_bandgap_write_thot(struct ti_bandgap *bgp, int id, int val)
|
|
{
|
|
return _ti_bandgap_write_threshold(bgp, id, val, true);
|
|
}
|
|
|
|
/**
|
|
* ti_bandgap_read_tcold() - reads sensor current tcold
|
|
* @bgp: pointer to bandgap instance
|
|
* @id: sensor id
|
|
* @tcold: resulting current tcold value
|
|
*
|
|
* Return: 0 on success or the proper error code
|
|
*/
|
|
int ti_bandgap_read_tcold(struct ti_bandgap *bgp, int id, int *tcold)
|
|
{
|
|
return _ti_bandgap_read_threshold(bgp, id, tcold, false);
|
|
}
|
|
|
|
/**
|
|
* ti_bandgap_write_tcold() - sets the sensor tcold
|
|
* @bgp: pointer to bandgap instance
|
|
* @id: sensor id
|
|
* @val: desired tcold value
|
|
*
|
|
* Return: 0 on success or the proper error code
|
|
*/
|
|
int ti_bandgap_write_tcold(struct ti_bandgap *bgp, int id, int val)
|
|
{
|
|
return _ti_bandgap_write_threshold(bgp, id, val, false);
|
|
}
|
|
|
|
/**
|
|
* ti_bandgap_read_counter() - read the sensor counter
|
|
* @bgp: pointer to bandgap instance
|
|
* @id: sensor id
|
|
* @interval: resulting update interval in miliseconds
|
|
*/
|
|
static void ti_bandgap_read_counter(struct ti_bandgap *bgp, int id,
|
|
int *interval)
|
|
{
|
|
struct temp_sensor_registers *tsr;
|
|
int time;
|
|
|
|
tsr = bgp->conf->sensors[id].registers;
|
|
time = ti_bandgap_readl(bgp, tsr->bgap_counter);
|
|
time = (time & tsr->counter_mask) >>
|
|
__ffs(tsr->counter_mask);
|
|
time = time * 1000 / bgp->clk_rate;
|
|
*interval = time;
|
|
}
|
|
|
|
/**
|
|
* ti_bandgap_read_counter_delay() - read the sensor counter delay
|
|
* @bgp: pointer to bandgap instance
|
|
* @id: sensor id
|
|
* @interval: resulting update interval in miliseconds
|
|
*/
|
|
static void ti_bandgap_read_counter_delay(struct ti_bandgap *bgp, int id,
|
|
int *interval)
|
|
{
|
|
struct temp_sensor_registers *tsr;
|
|
int reg_val;
|
|
|
|
tsr = bgp->conf->sensors[id].registers;
|
|
|
|
reg_val = ti_bandgap_readl(bgp, tsr->bgap_mask_ctrl);
|
|
reg_val = (reg_val & tsr->mask_counter_delay_mask) >>
|
|
__ffs(tsr->mask_counter_delay_mask);
|
|
switch (reg_val) {
|
|
case 0:
|
|
*interval = 0;
|
|
break;
|
|
case 1:
|
|
*interval = 1;
|
|
break;
|
|
case 2:
|
|
*interval = 10;
|
|
break;
|
|
case 3:
|
|
*interval = 100;
|
|
break;
|
|
case 4:
|
|
*interval = 250;
|
|
break;
|
|
case 5:
|
|
*interval = 500;
|
|
break;
|
|
default:
|
|
dev_warn(bgp->dev, "Wrong counter delay value read from register %X",
|
|
reg_val);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* ti_bandgap_read_update_interval() - read the sensor update interval
|
|
* @bgp: pointer to bandgap instance
|
|
* @id: sensor id
|
|
* @interval: resulting update interval in miliseconds
|
|
*
|
|
* Return: 0 on success or the proper error code
|
|
*/
|
|
int ti_bandgap_read_update_interval(struct ti_bandgap *bgp, int id,
|
|
int *interval)
|
|
{
|
|
int ret = 0;
|
|
|
|
ret = ti_bandgap_validate(bgp, id);
|
|
if (ret)
|
|
goto exit;
|
|
|
|
if (!TI_BANDGAP_HAS(bgp, COUNTER) &&
|
|
!TI_BANDGAP_HAS(bgp, COUNTER_DELAY)) {
|
|
ret = -ENOTSUPP;
|
|
goto exit;
|
|
}
|
|
|
|
if (TI_BANDGAP_HAS(bgp, COUNTER)) {
|
|
ti_bandgap_read_counter(bgp, id, interval);
|
|
goto exit;
|
|
}
|
|
|
|
ti_bandgap_read_counter_delay(bgp, id, interval);
|
|
exit:
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* ti_bandgap_write_counter_delay() - set the counter_delay
|
|
* @bgp: pointer to bandgap instance
|
|
* @id: sensor id
|
|
* @interval: desired update interval in miliseconds
|
|
*
|
|
* Return: 0 on success or the proper error code
|
|
*/
|
|
static int ti_bandgap_write_counter_delay(struct ti_bandgap *bgp, int id,
|
|
u32 interval)
|
|
{
|
|
int rval;
|
|
|
|
switch (interval) {
|
|
case 0: /* Immediate conversion */
|
|
rval = 0x0;
|
|
break;
|
|
case 1: /* Conversion after ever 1ms */
|
|
rval = 0x1;
|
|
break;
|
|
case 10: /* Conversion after ever 10ms */
|
|
rval = 0x2;
|
|
break;
|
|
case 100: /* Conversion after ever 100ms */
|
|
rval = 0x3;
|
|
break;
|
|
case 250: /* Conversion after ever 250ms */
|
|
rval = 0x4;
|
|
break;
|
|
case 500: /* Conversion after ever 500ms */
|
|
rval = 0x5;
|
|
break;
|
|
default:
|
|
dev_warn(bgp->dev, "Delay %d ms is not supported\n", interval);
|
|
return -EINVAL;
|
|
}
|
|
|
|
spin_lock(&bgp->lock);
|
|
RMW_BITS(bgp, id, bgap_mask_ctrl, mask_counter_delay_mask, rval);
|
|
spin_unlock(&bgp->lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* ti_bandgap_write_counter() - set the bandgap sensor counter
|
|
* @bgp: pointer to bandgap instance
|
|
* @id: sensor id
|
|
* @interval: desired update interval in miliseconds
|
|
*/
|
|
static void ti_bandgap_write_counter(struct ti_bandgap *bgp, int id,
|
|
u32 interval)
|
|
{
|
|
interval = interval * bgp->clk_rate / 1000;
|
|
spin_lock(&bgp->lock);
|
|
RMW_BITS(bgp, id, bgap_counter, counter_mask, interval);
|
|
spin_unlock(&bgp->lock);
|
|
}
|
|
|
|
/**
|
|
* ti_bandgap_write_update_interval() - set the update interval
|
|
* @bgp: pointer to bandgap instance
|
|
* @id: sensor id
|
|
* @interval: desired update interval in miliseconds
|
|
*
|
|
* Return: 0 on success or the proper error code
|
|
*/
|
|
int ti_bandgap_write_update_interval(struct ti_bandgap *bgp,
|
|
int id, u32 interval)
|
|
{
|
|
int ret = ti_bandgap_validate(bgp, id);
|
|
if (ret)
|
|
goto exit;
|
|
|
|
if (!TI_BANDGAP_HAS(bgp, COUNTER) &&
|
|
!TI_BANDGAP_HAS(bgp, COUNTER_DELAY)) {
|
|
ret = -ENOTSUPP;
|
|
goto exit;
|
|
}
|
|
|
|
if (TI_BANDGAP_HAS(bgp, COUNTER)) {
|
|
ti_bandgap_write_counter(bgp, id, interval);
|
|
goto exit;
|
|
}
|
|
|
|
ret = ti_bandgap_write_counter_delay(bgp, id, interval);
|
|
exit:
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* ti_bandgap_read_temperature() - report current temperature
|
|
* @bgp: pointer to bandgap instance
|
|
* @id: sensor id
|
|
* @temperature: resulting temperature
|
|
*
|
|
* Return: 0 on success or the proper error code
|
|
*/
|
|
int ti_bandgap_read_temperature(struct ti_bandgap *bgp, int id,
|
|
int *temperature)
|
|
{
|
|
u32 temp;
|
|
int ret;
|
|
|
|
ret = ti_bandgap_validate(bgp, id);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (!TI_BANDGAP_HAS(bgp, MODE_CONFIG)) {
|
|
ret = ti_bandgap_force_single_read(bgp, id);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
spin_lock(&bgp->lock);
|
|
temp = ti_bandgap_read_temp(bgp, id);
|
|
spin_unlock(&bgp->lock);
|
|
|
|
ret = ti_bandgap_adc_to_mcelsius(bgp, temp, &temp);
|
|
if (ret)
|
|
return -EIO;
|
|
|
|
*temperature = temp;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* ti_bandgap_set_sensor_data() - helper function to store thermal
|
|
* framework related data.
|
|
* @bgp: pointer to bandgap instance
|
|
* @id: sensor id
|
|
* @data: thermal framework related data to be stored
|
|
*
|
|
* Return: 0 on success or the proper error code
|
|
*/
|
|
int ti_bandgap_set_sensor_data(struct ti_bandgap *bgp, int id, void *data)
|
|
{
|
|
int ret = ti_bandgap_validate(bgp, id);
|
|
if (ret)
|
|
return ret;
|
|
|
|
bgp->regval[id].data = data;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* ti_bandgap_get_sensor_data() - helper function to get thermal
|
|
* framework related data.
|
|
* @bgp: pointer to bandgap instance
|
|
* @id: sensor id
|
|
*
|
|
* Return: data stored by set function with sensor id on success or NULL
|
|
*/
|
|
void *ti_bandgap_get_sensor_data(struct ti_bandgap *bgp, int id)
|
|
{
|
|
int ret = ti_bandgap_validate(bgp, id);
|
|
if (ret)
|
|
return ERR_PTR(ret);
|
|
|
|
return bgp->regval[id].data;
|
|
}
|
|
|
|
/*** Helper functions used during device initialization ***/
|
|
|
|
/**
|
|
* ti_bandgap_force_single_read() - executes 1 single ADC conversion
|
|
* @bgp: pointer to struct ti_bandgap
|
|
* @id: sensor id which it is desired to read 1 temperature
|
|
*
|
|
* Used to initialize the conversion state machine and set it to a valid
|
|
* state. Called during device initialization and context restore events.
|
|
*
|
|
* Return: 0
|
|
*/
|
|
static int
|
|
ti_bandgap_force_single_read(struct ti_bandgap *bgp, int id)
|
|
{
|
|
u32 counter = 1000;
|
|
struct temp_sensor_registers *tsr;
|
|
|
|
/* Select single conversion mode */
|
|
if (TI_BANDGAP_HAS(bgp, MODE_CONFIG))
|
|
RMW_BITS(bgp, id, bgap_mode_ctrl, mode_ctrl_mask, 0);
|
|
|
|
/* Start of Conversion = 1 */
|
|
RMW_BITS(bgp, id, temp_sensor_ctrl, bgap_soc_mask, 1);
|
|
|
|
/* Wait for EOCZ going up */
|
|
tsr = bgp->conf->sensors[id].registers;
|
|
|
|
while (--counter) {
|
|
if (ti_bandgap_readl(bgp, tsr->temp_sensor_ctrl) &
|
|
tsr->bgap_eocz_mask)
|
|
break;
|
|
}
|
|
|
|
/* Start of Conversion = 0 */
|
|
RMW_BITS(bgp, id, temp_sensor_ctrl, bgap_soc_mask, 0);
|
|
|
|
/* Wait for EOCZ going down */
|
|
counter = 1000;
|
|
while (--counter) {
|
|
if (!(ti_bandgap_readl(bgp, tsr->temp_sensor_ctrl) &
|
|
tsr->bgap_eocz_mask))
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* ti_bandgap_set_continous_mode() - One time enabling of continuous mode
|
|
* @bgp: pointer to struct ti_bandgap
|
|
*
|
|
* Call this function only if HAS(MODE_CONFIG) is set. As this driver may
|
|
* be used for junction temperature monitoring, it is desirable that the
|
|
* sensors are operational all the time, so that alerts are generated
|
|
* properly.
|
|
*
|
|
* Return: 0
|
|
*/
|
|
static int ti_bandgap_set_continuous_mode(struct ti_bandgap *bgp)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < bgp->conf->sensor_count; i++) {
|
|
/* Perform a single read just before enabling continuous */
|
|
ti_bandgap_force_single_read(bgp, i);
|
|
RMW_BITS(bgp, i, bgap_mode_ctrl, mode_ctrl_mask, 1);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* ti_bandgap_get_trend() - To fetch the temperature trend of a sensor
|
|
* @bgp: pointer to struct ti_bandgap
|
|
* @id: id of the individual sensor
|
|
* @trend: Pointer to trend.
|
|
*
|
|
* This function needs to be called to fetch the temperature trend of a
|
|
* Particular sensor. The function computes the difference in temperature
|
|
* w.r.t time. For the bandgaps with built in history buffer the temperatures
|
|
* are read from the buffer and for those without the Buffer -ENOTSUPP is
|
|
* returned.
|
|
*
|
|
* Return: 0 if no error, else return corresponding error. If no
|
|
* error then the trend value is passed on to trend parameter
|
|
*/
|
|
int ti_bandgap_get_trend(struct ti_bandgap *bgp, int id, int *trend)
|
|
{
|
|
struct temp_sensor_registers *tsr;
|
|
u32 temp1, temp2, reg1, reg2;
|
|
int t1, t2, interval, ret = 0;
|
|
|
|
ret = ti_bandgap_validate(bgp, id);
|
|
if (ret)
|
|
goto exit;
|
|
|
|
if (!TI_BANDGAP_HAS(bgp, HISTORY_BUFFER) ||
|
|
!TI_BANDGAP_HAS(bgp, FREEZE_BIT)) {
|
|
ret = -ENOTSUPP;
|
|
goto exit;
|
|
}
|
|
|
|
spin_lock(&bgp->lock);
|
|
|
|
tsr = bgp->conf->sensors[id].registers;
|
|
|
|
/* Freeze and read the last 2 valid readings */
|
|
RMW_BITS(bgp, id, bgap_mask_ctrl, mask_freeze_mask, 1);
|
|
reg1 = tsr->ctrl_dtemp_1;
|
|
reg2 = tsr->ctrl_dtemp_2;
|
|
|
|
/* read temperature from history buffer */
|
|
temp1 = ti_bandgap_readl(bgp, reg1);
|
|
temp1 &= tsr->bgap_dtemp_mask;
|
|
|
|
temp2 = ti_bandgap_readl(bgp, reg2);
|
|
temp2 &= tsr->bgap_dtemp_mask;
|
|
|
|
/* Convert from adc values to mCelsius temperature */
|
|
ret = ti_bandgap_adc_to_mcelsius(bgp, temp1, &t1);
|
|
if (ret)
|
|
goto unfreeze;
|
|
|
|
ret = ti_bandgap_adc_to_mcelsius(bgp, temp2, &t2);
|
|
if (ret)
|
|
goto unfreeze;
|
|
|
|
/* Fetch the update interval */
|
|
ret = ti_bandgap_read_update_interval(bgp, id, &interval);
|
|
if (ret)
|
|
goto unfreeze;
|
|
|
|
/* Set the interval to 1 ms if bandgap counter delay is not set */
|
|
if (interval == 0)
|
|
interval = 1;
|
|
|
|
*trend = (t1 - t2) / interval;
|
|
|
|
dev_dbg(bgp->dev, "The temperatures are t1 = %d and t2 = %d and trend =%d\n",
|
|
t1, t2, *trend);
|
|
|
|
unfreeze:
|
|
RMW_BITS(bgp, id, bgap_mask_ctrl, mask_freeze_mask, 0);
|
|
spin_unlock(&bgp->lock);
|
|
exit:
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* ti_bandgap_tshut_init() - setup and initialize tshut handling
|
|
* @bgp: pointer to struct ti_bandgap
|
|
* @pdev: pointer to device struct platform_device
|
|
*
|
|
* Call this function only in case the bandgap features HAS(TSHUT).
|
|
* In this case, the driver needs to handle the TSHUT signal as an IRQ.
|
|
* The IRQ is wired as a GPIO, and for this purpose, it is required
|
|
* to specify which GPIO line is used. TSHUT IRQ is fired anytime
|
|
* one of the bandgap sensors violates the TSHUT high/hot threshold.
|
|
* And in that case, the system must go off.
|
|
*
|
|
* Return: 0 if no error, else error status
|
|
*/
|
|
static int ti_bandgap_tshut_init(struct ti_bandgap *bgp,
|
|
struct platform_device *pdev)
|
|
{
|
|
int gpio_nr = bgp->tshut_gpio;
|
|
int status;
|
|
|
|
/* Request for gpio_86 line */
|
|
status = gpio_request(gpio_nr, "tshut");
|
|
if (status < 0) {
|
|
dev_err(bgp->dev, "Could not request for TSHUT GPIO:%i\n", 86);
|
|
return status;
|
|
}
|
|
status = gpio_direction_input(gpio_nr);
|
|
if (status) {
|
|
dev_err(bgp->dev, "Cannot set input TSHUT GPIO %d\n", gpio_nr);
|
|
return status;
|
|
}
|
|
|
|
status = request_irq(gpio_to_irq(gpio_nr), ti_bandgap_tshut_irq_handler,
|
|
IRQF_TRIGGER_RISING, "tshut", NULL);
|
|
if (status) {
|
|
gpio_free(gpio_nr);
|
|
dev_err(bgp->dev, "request irq failed for TSHUT");
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* ti_bandgap_alert_init() - setup and initialize talert handling
|
|
* @bgp: pointer to struct ti_bandgap
|
|
* @pdev: pointer to device struct platform_device
|
|
*
|
|
* Call this function only in case the bandgap features HAS(TALERT).
|
|
* In this case, the driver needs to handle the TALERT signals as an IRQs.
|
|
* TALERT is a normal IRQ and it is fired any time thresholds (hot or cold)
|
|
* are violated. In these situation, the driver must reprogram the thresholds,
|
|
* accordingly to specified policy.
|
|
*
|
|
* Return: 0 if no error, else return corresponding error.
|
|
*/
|
|
static int ti_bandgap_talert_init(struct ti_bandgap *bgp,
|
|
struct platform_device *pdev)
|
|
{
|
|
int ret;
|
|
|
|
bgp->irq = platform_get_irq(pdev, 0);
|
|
if (bgp->irq < 0) {
|
|
dev_err(&pdev->dev, "get_irq failed\n");
|
|
return bgp->irq;
|
|
}
|
|
ret = request_threaded_irq(bgp->irq, NULL,
|
|
ti_bandgap_talert_irq_handler,
|
|
IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
|
|
"talert", bgp);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "Request threaded irq failed.\n");
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id of_ti_bandgap_match[];
|
|
/**
|
|
* ti_bandgap_build() - parse DT and setup a struct ti_bandgap
|
|
* @pdev: pointer to device struct platform_device
|
|
*
|
|
* Used to read the device tree properties accordingly to the bandgap
|
|
* matching version. Based on bandgap version and its capabilities it
|
|
* will build a struct ti_bandgap out of the required DT entries.
|
|
*
|
|
* Return: valid bandgap structure if successful, else returns ERR_PTR
|
|
* return value must be verified with IS_ERR.
|
|
*/
|
|
static struct ti_bandgap *ti_bandgap_build(struct platform_device *pdev)
|
|
{
|
|
struct device_node *node = pdev->dev.of_node;
|
|
const struct of_device_id *of_id;
|
|
struct ti_bandgap *bgp;
|
|
struct resource *res;
|
|
int i;
|
|
|
|
/* just for the sake */
|
|
if (!node) {
|
|
dev_err(&pdev->dev, "no platform information available\n");
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
bgp = devm_kzalloc(&pdev->dev, sizeof(*bgp), GFP_KERNEL);
|
|
if (!bgp) {
|
|
dev_err(&pdev->dev, "Unable to allocate mem for driver ref\n");
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
|
|
of_id = of_match_device(of_ti_bandgap_match, &pdev->dev);
|
|
if (of_id)
|
|
bgp->conf = of_id->data;
|
|
|
|
/* register shadow for context save and restore */
|
|
bgp->regval = devm_kzalloc(&pdev->dev, sizeof(*bgp->regval) *
|
|
bgp->conf->sensor_count, GFP_KERNEL);
|
|
if (!bgp->regval) {
|
|
dev_err(&pdev->dev, "Unable to allocate mem for driver ref\n");
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
|
|
i = 0;
|
|
do {
|
|
void __iomem *chunk;
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, i);
|
|
if (!res)
|
|
break;
|
|
chunk = devm_ioremap_resource(&pdev->dev, res);
|
|
if (i == 0)
|
|
bgp->base = chunk;
|
|
if (IS_ERR(chunk))
|
|
return ERR_CAST(chunk);
|
|
|
|
i++;
|
|
} while (res);
|
|
|
|
if (TI_BANDGAP_HAS(bgp, TSHUT)) {
|
|
bgp->tshut_gpio = of_get_gpio(node, 0);
|
|
if (!gpio_is_valid(bgp->tshut_gpio)) {
|
|
dev_err(&pdev->dev, "invalid gpio for tshut (%d)\n",
|
|
bgp->tshut_gpio);
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
}
|
|
|
|
return bgp;
|
|
}
|
|
|
|
/*** Device driver call backs ***/
|
|
|
|
static
|
|
int ti_bandgap_probe(struct platform_device *pdev)
|
|
{
|
|
struct ti_bandgap *bgp;
|
|
int clk_rate, ret, i;
|
|
|
|
bgp = ti_bandgap_build(pdev);
|
|
if (IS_ERR(bgp)) {
|
|
dev_err(&pdev->dev, "failed to fetch platform data\n");
|
|
return PTR_ERR(bgp);
|
|
}
|
|
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) {
|
|
dev_err(&pdev->dev,
|
|
"failed to initialize system tshut IRQ\n");
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
bgp->fclock = clk_get(NULL, bgp->conf->fclock_name);
|
|
if (IS_ERR(bgp->fclock)) {
|
|
dev_err(&pdev->dev, "failed to request fclock reference\n");
|
|
ret = PTR_ERR(bgp->fclock);
|
|
goto free_irqs;
|
|
}
|
|
|
|
bgp->div_clk = clk_get(NULL, bgp->conf->div_ck_name);
|
|
if (IS_ERR(bgp->div_clk)) {
|
|
dev_err(&pdev->dev, "failed to request div_ts_ck clock ref\n");
|
|
ret = PTR_ERR(bgp->div_clk);
|
|
goto free_irqs;
|
|
}
|
|
|
|
for (i = 0; i < bgp->conf->sensor_count; i++) {
|
|
struct temp_sensor_registers *tsr;
|
|
u32 val;
|
|
|
|
tsr = bgp->conf->sensors[i].registers;
|
|
/*
|
|
* check if the efuse has a non-zero value if not
|
|
* it is an untrimmed sample and the temperatures
|
|
* may not be accurate
|
|
*/
|
|
val = ti_bandgap_readl(bgp, tsr->bgap_efuse);
|
|
if (!val)
|
|
dev_info(&pdev->dev,
|
|
"Non-trimmed BGAP, Temp not accurate\n");
|
|
}
|
|
|
|
clk_rate = clk_round_rate(bgp->div_clk,
|
|
bgp->conf->sensors[0].ts_data->max_freq);
|
|
if (clk_rate < bgp->conf->sensors[0].ts_data->min_freq ||
|
|
clk_rate <= 0) {
|
|
ret = -ENODEV;
|
|
dev_err(&pdev->dev, "wrong clock rate (%d)\n", clk_rate);
|
|
goto put_clks;
|
|
}
|
|
|
|
ret = clk_set_rate(bgp->div_clk, clk_rate);
|
|
if (ret)
|
|
dev_err(&pdev->dev, "Cannot re-set clock rate. Continuing\n");
|
|
|
|
bgp->clk_rate = clk_rate;
|
|
if (TI_BANDGAP_HAS(bgp, CLK_CTRL))
|
|
clk_prepare_enable(bgp->fclock);
|
|
|
|
|
|
spin_lock_init(&bgp->lock);
|
|
bgp->dev = &pdev->dev;
|
|
platform_set_drvdata(pdev, bgp);
|
|
|
|
ti_bandgap_power(bgp, true);
|
|
|
|
/* Set default counter to 1 for now */
|
|
if (TI_BANDGAP_HAS(bgp, COUNTER))
|
|
for (i = 0; i < bgp->conf->sensor_count; i++)
|
|
RMW_BITS(bgp, i, bgap_counter, counter_mask, 1);
|
|
|
|
/* Set default thresholds for alert and shutdown */
|
|
for (i = 0; i < bgp->conf->sensor_count; i++) {
|
|
struct temp_sensor_data *ts_data;
|
|
|
|
ts_data = bgp->conf->sensors[i].ts_data;
|
|
|
|
if (TI_BANDGAP_HAS(bgp, TALERT)) {
|
|
/* Set initial Talert thresholds */
|
|
RMW_BITS(bgp, i, bgap_threshold,
|
|
threshold_tcold_mask, ts_data->t_cold);
|
|
RMW_BITS(bgp, i, bgap_threshold,
|
|
threshold_thot_mask, ts_data->t_hot);
|
|
/* Enable the alert events */
|
|
RMW_BITS(bgp, i, bgap_mask_ctrl, mask_hot_mask, 1);
|
|
RMW_BITS(bgp, i, bgap_mask_ctrl, mask_cold_mask, 1);
|
|
}
|
|
|
|
if (TI_BANDGAP_HAS(bgp, TSHUT_CONFIG)) {
|
|
/* Set initial Tshut thresholds */
|
|
RMW_BITS(bgp, i, tshut_threshold,
|
|
tshut_hot_mask, ts_data->tshut_hot);
|
|
RMW_BITS(bgp, i, tshut_threshold,
|
|
tshut_cold_mask, ts_data->tshut_cold);
|
|
}
|
|
}
|
|
|
|
if (TI_BANDGAP_HAS(bgp, MODE_CONFIG))
|
|
ti_bandgap_set_continuous_mode(bgp);
|
|
|
|
/* Set .250 seconds time as default counter */
|
|
if (TI_BANDGAP_HAS(bgp, COUNTER))
|
|
for (i = 0; i < bgp->conf->sensor_count; i++)
|
|
RMW_BITS(bgp, i, bgap_counter, counter_mask,
|
|
bgp->clk_rate / 4);
|
|
|
|
/* Every thing is good? Then expose the sensors */
|
|
for (i = 0; i < bgp->conf->sensor_count; i++) {
|
|
char *domain;
|
|
|
|
if (bgp->conf->sensors[i].register_cooling) {
|
|
ret = bgp->conf->sensors[i].register_cooling(bgp, i);
|
|
if (ret)
|
|
goto remove_sensors;
|
|
}
|
|
|
|
if (bgp->conf->expose_sensor) {
|
|
domain = bgp->conf->sensors[i].domain;
|
|
ret = bgp->conf->expose_sensor(bgp, i, domain);
|
|
if (ret)
|
|
goto remove_last_cooling;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Enable the Interrupts once everything is set. Otherwise irq handler
|
|
* might be called as soon as it is enabled where as rest of framework
|
|
* is still getting initialised.
|
|
*/
|
|
if (TI_BANDGAP_HAS(bgp, TALERT)) {
|
|
ret = ti_bandgap_talert_init(bgp, pdev);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "failed to initialize Talert IRQ\n");
|
|
i = bgp->conf->sensor_count;
|
|
goto disable_clk;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
|
|
remove_last_cooling:
|
|
if (bgp->conf->sensors[i].unregister_cooling)
|
|
bgp->conf->sensors[i].unregister_cooling(bgp, i);
|
|
remove_sensors:
|
|
for (i--; i >= 0; i--) {
|
|
if (bgp->conf->sensors[i].unregister_cooling)
|
|
bgp->conf->sensors[i].unregister_cooling(bgp, i);
|
|
if (bgp->conf->remove_sensor)
|
|
bgp->conf->remove_sensor(bgp, i);
|
|
}
|
|
ti_bandgap_power(bgp, false);
|
|
disable_clk:
|
|
if (TI_BANDGAP_HAS(bgp, CLK_CTRL))
|
|
clk_disable_unprepare(bgp->fclock);
|
|
put_clks:
|
|
clk_put(bgp->fclock);
|
|
clk_put(bgp->div_clk);
|
|
free_irqs:
|
|
if (TI_BANDGAP_HAS(bgp, TSHUT)) {
|
|
free_irq(gpio_to_irq(bgp->tshut_gpio), NULL);
|
|
gpio_free(bgp->tshut_gpio);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static
|
|
int ti_bandgap_remove(struct platform_device *pdev)
|
|
{
|
|
struct ti_bandgap *bgp = platform_get_drvdata(pdev);
|
|
int i;
|
|
|
|
/* First thing is to remove sensor interfaces */
|
|
for (i = 0; i < bgp->conf->sensor_count; i++) {
|
|
if (bgp->conf->sensors[i].unregister_cooling)
|
|
bgp->conf->sensors[i].unregister_cooling(bgp, i);
|
|
|
|
if (bgp->conf->remove_sensor)
|
|
bgp->conf->remove_sensor(bgp, i);
|
|
}
|
|
|
|
ti_bandgap_power(bgp, false);
|
|
|
|
if (TI_BANDGAP_HAS(bgp, CLK_CTRL))
|
|
clk_disable_unprepare(bgp->fclock);
|
|
clk_put(bgp->fclock);
|
|
clk_put(bgp->div_clk);
|
|
|
|
if (TI_BANDGAP_HAS(bgp, TALERT))
|
|
free_irq(bgp->irq, bgp);
|
|
|
|
if (TI_BANDGAP_HAS(bgp, TSHUT)) {
|
|
free_irq(gpio_to_irq(bgp->tshut_gpio), NULL);
|
|
gpio_free(bgp->tshut_gpio);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static int ti_bandgap_save_ctxt(struct ti_bandgap *bgp)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < bgp->conf->sensor_count; i++) {
|
|
struct temp_sensor_registers *tsr;
|
|
struct temp_sensor_regval *rval;
|
|
|
|
rval = &bgp->regval[i];
|
|
tsr = bgp->conf->sensors[i].registers;
|
|
|
|
if (TI_BANDGAP_HAS(bgp, MODE_CONFIG))
|
|
rval->bg_mode_ctrl = ti_bandgap_readl(bgp,
|
|
tsr->bgap_mode_ctrl);
|
|
if (TI_BANDGAP_HAS(bgp, COUNTER))
|
|
rval->bg_counter = ti_bandgap_readl(bgp,
|
|
tsr->bgap_counter);
|
|
if (TI_BANDGAP_HAS(bgp, TALERT)) {
|
|
rval->bg_threshold = ti_bandgap_readl(bgp,
|
|
tsr->bgap_threshold);
|
|
rval->bg_ctrl = ti_bandgap_readl(bgp,
|
|
tsr->bgap_mask_ctrl);
|
|
}
|
|
|
|
if (TI_BANDGAP_HAS(bgp, TSHUT_CONFIG))
|
|
rval->tshut_threshold = ti_bandgap_readl(bgp,
|
|
tsr->tshut_threshold);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ti_bandgap_restore_ctxt(struct ti_bandgap *bgp)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < bgp->conf->sensor_count; i++) {
|
|
struct temp_sensor_registers *tsr;
|
|
struct temp_sensor_regval *rval;
|
|
u32 val = 0;
|
|
|
|
rval = &bgp->regval[i];
|
|
tsr = bgp->conf->sensors[i].registers;
|
|
|
|
if (TI_BANDGAP_HAS(bgp, COUNTER))
|
|
val = ti_bandgap_readl(bgp, tsr->bgap_counter);
|
|
|
|
if (TI_BANDGAP_HAS(bgp, TSHUT_CONFIG))
|
|
ti_bandgap_writel(bgp, rval->tshut_threshold,
|
|
tsr->tshut_threshold);
|
|
/* Force immediate temperature measurement and update
|
|
* of the DTEMP field
|
|
*/
|
|
ti_bandgap_force_single_read(bgp, i);
|
|
|
|
if (TI_BANDGAP_HAS(bgp, COUNTER))
|
|
ti_bandgap_writel(bgp, rval->bg_counter,
|
|
tsr->bgap_counter);
|
|
if (TI_BANDGAP_HAS(bgp, MODE_CONFIG))
|
|
ti_bandgap_writel(bgp, rval->bg_mode_ctrl,
|
|
tsr->bgap_mode_ctrl);
|
|
if (TI_BANDGAP_HAS(bgp, TALERT)) {
|
|
ti_bandgap_writel(bgp, rval->bg_threshold,
|
|
tsr->bgap_threshold);
|
|
ti_bandgap_writel(bgp, rval->bg_ctrl,
|
|
tsr->bgap_mask_ctrl);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ti_bandgap_suspend(struct device *dev)
|
|
{
|
|
struct ti_bandgap *bgp = dev_get_drvdata(dev);
|
|
int err;
|
|
|
|
err = ti_bandgap_save_ctxt(bgp);
|
|
ti_bandgap_power(bgp, false);
|
|
|
|
if (TI_BANDGAP_HAS(bgp, CLK_CTRL))
|
|
clk_disable_unprepare(bgp->fclock);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int ti_bandgap_resume(struct device *dev)
|
|
{
|
|
struct ti_bandgap *bgp = dev_get_drvdata(dev);
|
|
|
|
if (TI_BANDGAP_HAS(bgp, CLK_CTRL))
|
|
clk_prepare_enable(bgp->fclock);
|
|
|
|
ti_bandgap_power(bgp, true);
|
|
|
|
return ti_bandgap_restore_ctxt(bgp);
|
|
}
|
|
static SIMPLE_DEV_PM_OPS(ti_bandgap_dev_pm_ops, ti_bandgap_suspend,
|
|
ti_bandgap_resume);
|
|
|
|
#define DEV_PM_OPS (&ti_bandgap_dev_pm_ops)
|
|
#else
|
|
#define DEV_PM_OPS NULL
|
|
#endif
|
|
|
|
static const struct of_device_id of_ti_bandgap_match[] = {
|
|
#ifdef CONFIG_OMAP3_THERMAL
|
|
{
|
|
.compatible = "ti,omap34xx-bandgap",
|
|
.data = (void *)&omap34xx_data,
|
|
},
|
|
{
|
|
.compatible = "ti,omap36xx-bandgap",
|
|
.data = (void *)&omap36xx_data,
|
|
},
|
|
#endif
|
|
#ifdef CONFIG_OMAP4_THERMAL
|
|
{
|
|
.compatible = "ti,omap4430-bandgap",
|
|
.data = (void *)&omap4430_data,
|
|
},
|
|
{
|
|
.compatible = "ti,omap4460-bandgap",
|
|
.data = (void *)&omap4460_data,
|
|
},
|
|
{
|
|
.compatible = "ti,omap4470-bandgap",
|
|
.data = (void *)&omap4470_data,
|
|
},
|
|
#endif
|
|
#ifdef CONFIG_OMAP5_THERMAL
|
|
{
|
|
.compatible = "ti,omap5430-bandgap",
|
|
.data = (void *)&omap5430_data,
|
|
},
|
|
#endif
|
|
#ifdef CONFIG_DRA752_THERMAL
|
|
{
|
|
.compatible = "ti,dra752-bandgap",
|
|
.data = (void *)&dra752_data,
|
|
},
|
|
#endif
|
|
/* Sentinel */
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(of, of_ti_bandgap_match);
|
|
|
|
static struct platform_driver ti_bandgap_sensor_driver = {
|
|
.probe = ti_bandgap_probe,
|
|
.remove = ti_bandgap_remove,
|
|
.driver = {
|
|
.name = "ti-soc-thermal",
|
|
.pm = DEV_PM_OPS,
|
|
.of_match_table = of_ti_bandgap_match,
|
|
},
|
|
};
|
|
|
|
module_platform_driver(ti_bandgap_sensor_driver);
|
|
|
|
MODULE_DESCRIPTION("OMAP4+ bandgap temperature sensor driver");
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_ALIAS("platform:ti-soc-thermal");
|
|
MODULE_AUTHOR("Texas Instrument Inc.");
|