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1304 lines
33 KiB
1304 lines
33 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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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 <[email protected]> |
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* Author: Moiz Sonasath <[email protected]> |
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* Couple of fixes, DT and MFD adaptation: |
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* Eduardo Valentin <[email protected]> |
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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/consumer.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/sys_soc.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/io.h> |
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#include <linux/iopoll.h> |
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#include <linux/cpu_pm.h> |
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#include <linux/device.h> |
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#include <linux/pm_runtime.h> |
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#include <linux/pm.h> |
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#include <linux/of.h> |
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#include <linux/of_device.h> |
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|
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#include "ti-bandgap.h" |
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|
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static int ti_bandgap_force_single_read(struct ti_bandgap *bgp, int id); |
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#ifdef CONFIG_PM_SLEEP |
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static int bandgap_omap_cpu_notifier(struct notifier_block *nb, |
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unsigned long cmd, void *v); |
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#endif |
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|
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/*** Helper functions to access registers and their bitfields ***/ |
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|
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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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/** |
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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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/** |
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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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|
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/*** Basic helper functions ***/ |
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|
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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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|
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if (!TI_BANDGAP_HAS(bgp, POWER_SWITCH)) |
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return -ENOTSUPP; |
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|
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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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/** |
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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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|
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val1 = ti_bandgap_readl(bgp, reg); |
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val2 = ti_bandgap_readl(bgp, reg); |
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|
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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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|
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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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/** |
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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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|
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tsr = bgp->conf->sensors[id].registers; |
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reg = tsr->temp_sensor_ctrl; |
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|
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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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|
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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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|
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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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|
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return temp; |
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} |
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|
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/*** IRQ handlers ***/ |
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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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return IRQ_HANDLED; |
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} |
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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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|
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orderly_poweroff(true); |
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|
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return IRQ_HANDLED; |
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} |
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|
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/*** Helper functions which manipulate conversion ADC <-> mi Celsius ***/ |
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|
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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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|
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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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/** |
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* ti_bandgap_validate() - helper to check the sanity of a struct ti_bandgap |
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* @bgp: struct ti_bandgap pointer |
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* @id: bandgap sensor id |
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* |
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* Checks if the bandgap pointer is valid and if the sensor id is also |
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* applicable. |
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* |
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* Return: 0 if no errors, -EINVAL for invalid @bgp pointer or -ERANGE if |
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* @id cannot index @bgp sensors. |
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*/ |
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static inline int ti_bandgap_validate(struct ti_bandgap *bgp, int id) |
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{ |
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if (!bgp || IS_ERR(bgp)) { |
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pr_err("%s: invalid bandgap pointer\n", __func__); |
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return -EINVAL; |
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} |
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|
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if ((id < 0) || (id >= bgp->conf->sensor_count)) { |
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dev_err(bgp->dev, "%s: sensor id out of range (%d)\n", |
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__func__, id); |
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return -ERANGE; |
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} |
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|
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return 0; |
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} |
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|
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/** |
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* ti_bandgap_read_counter() - read the sensor counter |
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* @bgp: pointer to bandgap instance |
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* @id: sensor id |
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* @interval: resulting update interval in miliseconds |
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*/ |
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static void ti_bandgap_read_counter(struct ti_bandgap *bgp, int id, |
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int *interval) |
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{ |
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struct temp_sensor_registers *tsr; |
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int time; |
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|
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tsr = bgp->conf->sensors[id].registers; |
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time = ti_bandgap_readl(bgp, tsr->bgap_counter); |
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time = (time & tsr->counter_mask) >> |
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__ffs(tsr->counter_mask); |
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time = time * 1000 / bgp->clk_rate; |
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*interval = time; |
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} |
|
|
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/** |
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* ti_bandgap_read_counter_delay() - read the sensor counter delay |
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* @bgp: pointer to bandgap instance |
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* @id: sensor id |
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* @interval: resulting update interval in miliseconds |
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*/ |
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static void ti_bandgap_read_counter_delay(struct ti_bandgap *bgp, int id, |
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int *interval) |
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{ |
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struct temp_sensor_registers *tsr; |
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int reg_val; |
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|
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tsr = bgp->conf->sensors[id].registers; |
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|
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reg_val = ti_bandgap_readl(bgp, tsr->bgap_mask_ctrl); |
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reg_val = (reg_val & tsr->mask_counter_delay_mask) >> |
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__ffs(tsr->mask_counter_delay_mask); |
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switch (reg_val) { |
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case 0: |
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*interval = 0; |
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break; |
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case 1: |
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*interval = 1; |
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break; |
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case 2: |
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*interval = 10; |
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break; |
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case 3: |
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*interval = 100; |
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break; |
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case 4: |
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*interval = 250; |
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break; |
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case 5: |
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*interval = 500; |
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break; |
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default: |
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dev_warn(bgp->dev, "Wrong counter delay value read from register %X", |
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reg_val); |
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} |
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} |
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|
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/** |
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* ti_bandgap_read_update_interval() - read the sensor update interval |
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* @bgp: pointer to bandgap instance |
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* @id: sensor id |
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* @interval: resulting update interval in miliseconds |
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* |
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* Return: 0 on success or the proper error code |
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*/ |
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int ti_bandgap_read_update_interval(struct ti_bandgap *bgp, int id, |
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int *interval) |
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{ |
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int ret = 0; |
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|
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ret = ti_bandgap_validate(bgp, id); |
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if (ret) |
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goto exit; |
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|
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if (!TI_BANDGAP_HAS(bgp, COUNTER) && |
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!TI_BANDGAP_HAS(bgp, COUNTER_DELAY)) { |
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ret = -ENOTSUPP; |
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goto exit; |
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} |
|
|
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if (TI_BANDGAP_HAS(bgp, COUNTER)) { |
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ti_bandgap_read_counter(bgp, id, interval); |
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goto exit; |
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} |
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|
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ti_bandgap_read_counter_delay(bgp, id, interval); |
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exit: |
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return ret; |
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} |
|
|
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/** |
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* ti_bandgap_write_counter_delay() - set the counter_delay |
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* @bgp: pointer to bandgap instance |
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* @id: sensor id |
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* @interval: desired update interval in miliseconds |
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* |
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* Return: 0 on success or the proper error code |
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*/ |
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static int ti_bandgap_write_counter_delay(struct ti_bandgap *bgp, int id, |
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u32 interval) |
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{ |
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int rval; |
|
|
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switch (interval) { |
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case 0: /* Immediate conversion */ |
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rval = 0x0; |
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break; |
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case 1: /* Conversion after ever 1ms */ |
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rval = 0x1; |
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break; |
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case 10: /* Conversion after ever 10ms */ |
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rval = 0x2; |
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break; |
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case 100: /* Conversion after ever 100ms */ |
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rval = 0x3; |
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break; |
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case 250: /* Conversion after ever 250ms */ |
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rval = 0x4; |
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break; |
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case 500: /* Conversion after ever 500ms */ |
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rval = 0x5; |
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break; |
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default: |
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dev_warn(bgp->dev, "Delay %d ms is not supported\n", interval); |
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return -EINVAL; |
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} |
|
|
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spin_lock(&bgp->lock); |
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RMW_BITS(bgp, id, bgap_mask_ctrl, mask_counter_delay_mask, rval); |
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spin_unlock(&bgp->lock); |
|
|
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return 0; |
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} |
|
|
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/** |
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* ti_bandgap_write_counter() - set the bandgap sensor counter |
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* @bgp: pointer to bandgap instance |
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* @id: sensor id |
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* @interval: desired update interval in miliseconds |
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*/ |
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static void ti_bandgap_write_counter(struct ti_bandgap *bgp, int id, |
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u32 interval) |
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{ |
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interval = interval * bgp->clk_rate / 1000; |
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spin_lock(&bgp->lock); |
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RMW_BITS(bgp, id, bgap_counter, counter_mask, interval); |
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spin_unlock(&bgp->lock); |
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} |
|
|
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/** |
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* ti_bandgap_write_update_interval() - set the update interval |
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* @bgp: pointer to bandgap instance |
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* @id: sensor id |
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* @interval: desired update interval in miliseconds |
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* |
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* Return: 0 on success or the proper error code |
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*/ |
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int ti_bandgap_write_update_interval(struct ti_bandgap *bgp, |
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int id, u32 interval) |
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{ |
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int ret = ti_bandgap_validate(bgp, id); |
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if (ret) |
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goto exit; |
|
|
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if (!TI_BANDGAP_HAS(bgp, COUNTER) && |
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!TI_BANDGAP_HAS(bgp, COUNTER_DELAY)) { |
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ret = -ENOTSUPP; |
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goto exit; |
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} |
|
|
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if (TI_BANDGAP_HAS(bgp, COUNTER)) { |
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ti_bandgap_write_counter(bgp, id, interval); |
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goto exit; |
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} |
|
|
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ret = ti_bandgap_write_counter_delay(bgp, id, interval); |
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exit: |
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return ret; |
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} |
|
|
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/** |
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* ti_bandgap_read_temperature() - report current temperature |
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* @bgp: pointer to bandgap instance |
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* @id: sensor id |
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* @temperature: resulting temperature |
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* |
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* Return: 0 on success or the proper error code |
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*/ |
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int ti_bandgap_read_temperature(struct ti_bandgap *bgp, int id, |
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int *temperature) |
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{ |
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u32 temp; |
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int ret; |
|
|
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ret = ti_bandgap_validate(bgp, id); |
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if (ret) |
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return ret; |
|
|
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if (!TI_BANDGAP_HAS(bgp, MODE_CONFIG)) { |
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ret = ti_bandgap_force_single_read(bgp, id); |
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if (ret) |
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return ret; |
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} |
|
|
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spin_lock(&bgp->lock); |
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temp = ti_bandgap_read_temp(bgp, id); |
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spin_unlock(&bgp->lock); |
|
|
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ret = ti_bandgap_adc_to_mcelsius(bgp, temp, &temp); |
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if (ret) |
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return -EIO; |
|
|
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*temperature = temp; |
|
|
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return 0; |
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} |
|
|
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/** |
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* ti_bandgap_set_sensor_data() - helper function to store thermal |
|
* framework related data. |
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* @bgp: pointer to bandgap instance |
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* @id: sensor id |
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* @data: thermal framework related data to be stored |
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* |
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* Return: 0 on success or the proper error code |
|
*/ |
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int ti_bandgap_set_sensor_data(struct ti_bandgap *bgp, int id, void *data) |
|
{ |
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int ret = ti_bandgap_validate(bgp, id); |
|
if (ret) |
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return ret; |
|
|
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bgp->regval[id].data = data; |
|
|
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return 0; |
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} |
|
|
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/** |
|
* ti_bandgap_get_sensor_data() - helper function to get thermal |
|
* framework related data. |
|
* @bgp: pointer to bandgap instance |
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* @id: sensor id |
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* |
|
* 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) |
|
{ |
|
struct temp_sensor_registers *tsr = bgp->conf->sensors[id].registers; |
|
void __iomem *temp_sensor_ctrl = bgp->base + tsr->temp_sensor_ctrl; |
|
int error; |
|
u32 val; |
|
|
|
/* Select continuous or single conversion mode */ |
|
if (TI_BANDGAP_HAS(bgp, MODE_CONFIG)) { |
|
if (TI_BANDGAP_HAS(bgp, CONT_MODE_ONLY)) |
|
RMW_BITS(bgp, id, bgap_mode_ctrl, mode_ctrl_mask, 1); |
|
else |
|
RMW_BITS(bgp, id, bgap_mode_ctrl, mode_ctrl_mask, 0); |
|
} |
|
|
|
/* Set Start of Conversion if available */ |
|
if (tsr->bgap_soc_mask) { |
|
RMW_BITS(bgp, id, temp_sensor_ctrl, bgap_soc_mask, 1); |
|
|
|
/* Wait for EOCZ going up */ |
|
error = readl_poll_timeout_atomic(temp_sensor_ctrl, val, |
|
val & tsr->bgap_eocz_mask, |
|
1, 1000); |
|
if (error) |
|
dev_warn(bgp->dev, "eocz timed out waiting high\n"); |
|
|
|
/* Clear Start of Conversion if available */ |
|
RMW_BITS(bgp, id, temp_sensor_ctrl, bgap_soc_mask, 0); |
|
} |
|
|
|
/* Wait for EOCZ going down, always needed even if no bgap_soc_mask */ |
|
error = readl_poll_timeout_atomic(temp_sensor_ctrl, val, |
|
!(val & tsr->bgap_eocz_mask), |
|
1, 1500); |
|
if (error) |
|
dev_warn(bgp->dev, "eocz timed out waiting low\n"); |
|
|
|
return 0; |
|
} |
|
|
|
/** |
|
* ti_bandgap_set_continuous_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 status; |
|
|
|
status = request_irq(gpiod_to_irq(bgp->tshut_gpiod), |
|
ti_bandgap_tshut_irq_handler, |
|
IRQF_TRIGGER_RISING, "tshut", NULL); |
|
if (status) |
|
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) |
|
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) |
|
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_kcalloc(&pdev->dev, bgp->conf->sensor_count, |
|
sizeof(*bgp->regval), GFP_KERNEL); |
|
if (!bgp->regval) |
|
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_gpiod = devm_gpiod_get(&pdev->dev, NULL, GPIOD_IN); |
|
if (IS_ERR(bgp->tshut_gpiod)) { |
|
dev_err(&pdev->dev, "invalid gpio for tshut\n"); |
|
return ERR_CAST(bgp->tshut_gpiod); |
|
} |
|
} |
|
|
|
return bgp; |
|
} |
|
|
|
/* |
|
* List of SoCs on which the CPU PM notifier can cause erros on the DTEMP |
|
* readout. |
|
* Enabled notifier on these machines results in erroneous, random values which |
|
* could trigger unexpected thermal shutdown. |
|
*/ |
|
static const struct soc_device_attribute soc_no_cpu_notifier[] = { |
|
{ .machine = "OMAP4430" }, |
|
{ /* sentinel */ }, |
|
}; |
|
|
|
/*** 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 put_fclock; |
|
} |
|
|
|
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; |
|
} |
|
} |
|
|
|
#ifdef CONFIG_PM_SLEEP |
|
bgp->nb.notifier_call = bandgap_omap_cpu_notifier; |
|
if (!soc_device_match(soc_no_cpu_notifier)) |
|
cpu_pm_register_notifier(&bgp->nb); |
|
#endif |
|
|
|
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->div_clk); |
|
put_fclock: |
|
clk_put(bgp->fclock); |
|
free_irqs: |
|
if (TI_BANDGAP_HAS(bgp, TSHUT)) |
|
free_irq(gpiod_to_irq(bgp->tshut_gpiod), NULL); |
|
|
|
return ret; |
|
} |
|
|
|
static |
|
int ti_bandgap_remove(struct platform_device *pdev) |
|
{ |
|
struct ti_bandgap *bgp = platform_get_drvdata(pdev); |
|
int i; |
|
|
|
if (!soc_device_match(soc_no_cpu_notifier)) |
|
cpu_pm_unregister_notifier(&bgp->nb); |
|
|
|
/* 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(gpiod_to_irq(bgp->tshut_gpiod), NULL); |
|
|
|
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); |
|
|
|
bgp->is_suspended = true; |
|
|
|
return err; |
|
} |
|
|
|
static int bandgap_omap_cpu_notifier(struct notifier_block *nb, |
|
unsigned long cmd, void *v) |
|
{ |
|
struct ti_bandgap *bgp; |
|
|
|
bgp = container_of(nb, struct ti_bandgap, nb); |
|
|
|
spin_lock(&bgp->lock); |
|
switch (cmd) { |
|
case CPU_CLUSTER_PM_ENTER: |
|
if (bgp->is_suspended) |
|
break; |
|
ti_bandgap_save_ctxt(bgp); |
|
ti_bandgap_power(bgp, false); |
|
if (TI_BANDGAP_HAS(bgp, CLK_CTRL)) |
|
clk_disable(bgp->fclock); |
|
break; |
|
case CPU_CLUSTER_PM_ENTER_FAILED: |
|
case CPU_CLUSTER_PM_EXIT: |
|
if (bgp->is_suspended) |
|
break; |
|
if (TI_BANDGAP_HAS(bgp, CLK_CTRL)) |
|
clk_enable(bgp->fclock); |
|
ti_bandgap_power(bgp, true); |
|
ti_bandgap_restore_ctxt(bgp); |
|
break; |
|
} |
|
spin_unlock(&bgp->lock); |
|
|
|
return NOTIFY_OK; |
|
} |
|
|
|
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); |
|
bgp->is_suspended = false; |
|
|
|
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.");
|
|
|