1188 lines
31 KiB
C
1188 lines
31 KiB
C
/*
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* OMAP4 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/mutex.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 "omap-bandgap.h"
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static u32 omap_bandgap_readl(struct omap_bandgap *bg_ptr, u32 reg)
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{
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return readl(bg_ptr->base + reg);
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}
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static void omap_bandgap_writel(struct omap_bandgap *bg_ptr, u32 val, u32 reg)
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{
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writel(val, bg_ptr->base + reg);
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}
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static int omap_bandgap_power(struct omap_bandgap *bg_ptr, bool on)
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{
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struct temp_sensor_registers *tsr;
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int i;
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u32 ctrl;
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if (!OMAP_BANDGAP_HAS(bg_ptr, POWER_SWITCH))
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return 0;
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for (i = 0; i < bg_ptr->conf->sensor_count; i++) {
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tsr = bg_ptr->conf->sensors[i].registers;
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ctrl = omap_bandgap_readl(bg_ptr, tsr->temp_sensor_ctrl);
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ctrl &= ~tsr->bgap_tempsoff_mask;
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/* active on 0 */
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ctrl |= !on << __ffs(tsr->bgap_tempsoff_mask);
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/* write BGAP_TEMPSOFF should be reset to 0 */
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omap_bandgap_writel(bg_ptr, ctrl, tsr->temp_sensor_ctrl);
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}
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return 0;
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}
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/* This is the Talert handler. Call it only if HAS(TALERT) is set */
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static irqreturn_t talert_irq_handler(int irq, void *data)
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{
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struct omap_bandgap *bg_ptr = data;
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struct temp_sensor_registers *tsr;
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u32 t_hot = 0, t_cold = 0, temp, ctrl;
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int i;
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bg_ptr = data;
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/* Read the status of t_hot */
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for (i = 0; i < bg_ptr->conf->sensor_count; i++) {
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tsr = bg_ptr->conf->sensors[i].registers;
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t_hot = omap_bandgap_readl(bg_ptr, tsr->bgap_status);
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t_hot &= tsr->status_hot_mask;
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/* Read the status of t_cold */
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t_cold = omap_bandgap_readl(bg_ptr, tsr->bgap_status);
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t_cold &= tsr->status_cold_mask;
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if (!t_cold && !t_hot)
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continue;
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ctrl = omap_bandgap_readl(bg_ptr, 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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omap_bandgap_writel(bg_ptr, ctrl, tsr->bgap_mask_ctrl);
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/* read temperature */
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temp = omap_bandgap_readl(bg_ptr, tsr->temp_sensor_ctrl);
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temp &= tsr->bgap_dtemp_mask;
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/* report temperature to whom may concern */
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if (bg_ptr->conf->report_temperature)
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bg_ptr->conf->report_temperature(bg_ptr, i);
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}
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return IRQ_HANDLED;
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}
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/* This is the Tshut handler. Call it only if HAS(TSHUT) is set */
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static irqreturn_t omap_bandgap_tshut_irq_handler(int irq, void *data)
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{
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orderly_poweroff(true);
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return IRQ_HANDLED;
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}
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static
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int adc_to_temp_conversion(struct omap_bandgap *bg_ptr, int id, int adc_val,
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int *t)
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{
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struct temp_sensor_data *ts_data = bg_ptr->conf->sensors[id].ts_data;
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/* look up for temperature in the table and return the temperature */
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if (adc_val < ts_data->adc_start_val || adc_val > ts_data->adc_end_val)
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return -ERANGE;
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*t = bg_ptr->conv_table[adc_val - ts_data->adc_start_val];
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return 0;
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}
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static int temp_to_adc_conversion(long temp, struct omap_bandgap *bg_ptr, int i,
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int *adc)
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{
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struct temp_sensor_data *ts_data = bg_ptr->conf->sensors[i].ts_data;
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int high, low, mid;
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low = 0;
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high = ts_data->adc_end_val - ts_data->adc_start_val;
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mid = (high + low) / 2;
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if (temp < bg_ptr->conv_table[high] || temp > bg_ptr->conv_table[high])
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return -EINVAL;
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while (low < high) {
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if (temp < bg_ptr->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 = ts_data->adc_start_val + low;
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return 0;
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}
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/* Talert masks. Call it only if HAS(TALERT) is set */
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static int temp_sensor_unmask_interrupts(struct omap_bandgap *bg_ptr, 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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tsr = bg_ptr->conf->sensors[id].registers;
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temp = omap_bandgap_readl(bg_ptr, tsr->temp_sensor_ctrl);
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temp &= tsr->bgap_dtemp_mask;
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reg_val = omap_bandgap_readl(bg_ptr, 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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omap_bandgap_writel(bg_ptr, reg_val, tsr->bgap_mask_ctrl);
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return 0;
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}
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static
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int add_hyst(int adc_val, int hyst_val, struct omap_bandgap *bg_ptr, int i,
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u32 *sum)
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{
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int temp, ret;
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ret = adc_to_temp_conversion(bg_ptr, i, 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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return temp_to_adc_conversion(temp, bg_ptr, i, sum);
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}
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/* Talert Thot threshold. Call it only if HAS(TALERT) is set */
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static
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int temp_sensor_configure_thot(struct omap_bandgap *bg_ptr, int id, int t_hot)
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{
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struct temp_sensor_data *ts_data = bg_ptr->conf->sensors[id].ts_data;
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struct temp_sensor_registers *tsr;
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u32 thresh_val, reg_val;
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int cold, err = 0;
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tsr = bg_ptr->conf->sensors[id].registers;
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/* obtain the T cold value */
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thresh_val = omap_bandgap_readl(bg_ptr, tsr->bgap_threshold);
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cold = (thresh_val & tsr->threshold_tcold_mask) >>
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__ffs(tsr->threshold_tcold_mask);
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if (t_hot <= cold) {
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/* change the t_cold to t_hot - 5000 millidegrees */
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err |= add_hyst(t_hot, -ts_data->hyst_val, bg_ptr, id, &cold);
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/* write the new t_cold value */
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reg_val = thresh_val & (~tsr->threshold_tcold_mask);
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reg_val |= cold << __ffs(tsr->threshold_tcold_mask);
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omap_bandgap_writel(bg_ptr, reg_val, tsr->bgap_threshold);
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thresh_val = reg_val;
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}
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/* write the new t_hot value */
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reg_val = thresh_val & ~tsr->threshold_thot_mask;
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reg_val |= (t_hot << __ffs(tsr->threshold_thot_mask));
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omap_bandgap_writel(bg_ptr, reg_val, tsr->bgap_threshold);
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if (err) {
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dev_err(bg_ptr->dev, "failed to reprogram thot threshold\n");
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return -EIO;
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}
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return temp_sensor_unmask_interrupts(bg_ptr, id, t_hot, cold);
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}
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/* Talert Thot and Tcold thresholds. Call it only if HAS(TALERT) is set */
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static
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int temp_sensor_init_talert_thresholds(struct omap_bandgap *bg_ptr, int id,
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int t_hot, int t_cold)
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{
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struct temp_sensor_registers *tsr;
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u32 reg_val, thresh_val;
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tsr = bg_ptr->conf->sensors[id].registers;
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thresh_val = omap_bandgap_readl(bg_ptr, tsr->bgap_threshold);
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/* write the new t_cold value */
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reg_val = thresh_val & ~tsr->threshold_tcold_mask;
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reg_val |= (t_cold << __ffs(tsr->threshold_tcold_mask));
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omap_bandgap_writel(bg_ptr, reg_val, tsr->bgap_threshold);
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thresh_val = omap_bandgap_readl(bg_ptr, tsr->bgap_threshold);
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/* write the new t_hot value */
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reg_val = thresh_val & ~tsr->threshold_thot_mask;
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reg_val |= (t_hot << __ffs(tsr->threshold_thot_mask));
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omap_bandgap_writel(bg_ptr, reg_val, tsr->bgap_threshold);
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reg_val = omap_bandgap_readl(bg_ptr, tsr->bgap_mask_ctrl);
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reg_val |= tsr->mask_hot_mask;
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reg_val |= tsr->mask_cold_mask;
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omap_bandgap_writel(bg_ptr, reg_val, tsr->bgap_mask_ctrl);
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return 0;
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}
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/* Talert Tcold threshold. Call it only if HAS(TALERT) is set */
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static
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int temp_sensor_configure_tcold(struct omap_bandgap *bg_ptr, int id,
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int t_cold)
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{
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struct temp_sensor_data *ts_data = bg_ptr->conf->sensors[id].ts_data;
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struct temp_sensor_registers *tsr;
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u32 thresh_val, reg_val;
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int hot, err = 0;
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tsr = bg_ptr->conf->sensors[id].registers;
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/* obtain the T cold value */
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thresh_val = omap_bandgap_readl(bg_ptr, tsr->bgap_threshold);
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hot = (thresh_val & tsr->threshold_thot_mask) >>
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__ffs(tsr->threshold_thot_mask);
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if (t_cold >= hot) {
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/* change the t_hot to t_cold + 5000 millidegrees */
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err |= add_hyst(t_cold, ts_data->hyst_val, bg_ptr, id, &hot);
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/* write the new t_hot value */
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reg_val = thresh_val & (~tsr->threshold_thot_mask);
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reg_val |= hot << __ffs(tsr->threshold_thot_mask);
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omap_bandgap_writel(bg_ptr, reg_val, tsr->bgap_threshold);
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thresh_val = reg_val;
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}
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/* write the new t_cold value */
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reg_val = thresh_val & ~tsr->threshold_tcold_mask;
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reg_val |= (t_cold << __ffs(tsr->threshold_tcold_mask));
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omap_bandgap_writel(bg_ptr, reg_val, tsr->bgap_threshold);
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if (err) {
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dev_err(bg_ptr->dev, "failed to reprogram tcold threshold\n");
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return -EIO;
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}
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return temp_sensor_unmask_interrupts(bg_ptr, id, hot, t_cold);
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}
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/* This is Tshut Thot config. Call it only if HAS(TSHUT_CONFIG) is set */
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static int temp_sensor_configure_tshut_hot(struct omap_bandgap *bg_ptr,
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int id, int tshut_hot)
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{
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struct temp_sensor_registers *tsr;
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u32 reg_val;
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tsr = bg_ptr->conf->sensors[id].registers;
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reg_val = omap_bandgap_readl(bg_ptr, tsr->tshut_threshold);
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reg_val &= ~tsr->tshut_hot_mask;
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reg_val |= tshut_hot << __ffs(tsr->tshut_hot_mask);
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omap_bandgap_writel(bg_ptr, reg_val, tsr->tshut_threshold);
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return 0;
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}
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/* This is Tshut Tcold config. Call it only if HAS(TSHUT_CONFIG) is set */
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static int temp_sensor_configure_tshut_cold(struct omap_bandgap *bg_ptr,
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int id, int tshut_cold)
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{
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struct temp_sensor_registers *tsr;
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u32 reg_val;
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tsr = bg_ptr->conf->sensors[id].registers;
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reg_val = omap_bandgap_readl(bg_ptr, tsr->tshut_threshold);
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reg_val &= ~tsr->tshut_cold_mask;
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reg_val |= tshut_cold << __ffs(tsr->tshut_cold_mask);
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omap_bandgap_writel(bg_ptr, reg_val, tsr->tshut_threshold);
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return 0;
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}
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/* This is counter config. Call it only if HAS(COUNTER) is set */
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static int configure_temp_sensor_counter(struct omap_bandgap *bg_ptr, int id,
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u32 counter)
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{
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struct temp_sensor_registers *tsr;
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u32 val;
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tsr = bg_ptr->conf->sensors[id].registers;
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val = omap_bandgap_readl(bg_ptr, tsr->bgap_counter);
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val &= ~tsr->counter_mask;
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val |= counter << __ffs(tsr->counter_mask);
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omap_bandgap_writel(bg_ptr, val, tsr->bgap_counter);
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return 0;
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}
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#define bandgap_is_valid(b) \
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(!IS_ERR_OR_NULL(b))
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#define bandgap_is_valid_sensor_id(b, i) \
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((i) >= 0 && (i) < (b)->conf->sensor_count)
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static inline int omap_bandgap_validate(struct omap_bandgap *bg_ptr, int id)
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{
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if (!bandgap_is_valid(bg_ptr)) {
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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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if (!bandgap_is_valid_sensor_id(bg_ptr, id)) {
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dev_err(bg_ptr->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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return 0;
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}
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/* Exposed APIs */
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/**
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* omap_bandgap_read_thot() - reads sensor current thot
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* @bg_ptr - pointer to bandgap instance
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* @id - sensor id
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* @thot - resulting current thot value
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*
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* returns 0 on success or the proper error code
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*/
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int omap_bandgap_read_thot(struct omap_bandgap *bg_ptr, int id,
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int *thot)
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{
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struct temp_sensor_registers *tsr;
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u32 temp;
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int ret;
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ret = omap_bandgap_validate(bg_ptr, id);
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if (ret)
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return ret;
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if (!OMAP_BANDGAP_HAS(bg_ptr, TALERT))
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return -ENOTSUPP;
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tsr = bg_ptr->conf->sensors[id].registers;
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temp = omap_bandgap_readl(bg_ptr, tsr->bgap_threshold);
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temp = (temp & tsr->threshold_thot_mask) >>
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__ffs(tsr->threshold_thot_mask);
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ret |= adc_to_temp_conversion(bg_ptr, id, temp, &temp);
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if (ret) {
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dev_err(bg_ptr->dev, "failed to read thot\n");
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return -EIO;
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}
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*thot = temp;
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return 0;
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}
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/**
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* omap_bandgap_write_thot() - sets sensor current thot
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* @bg_ptr - pointer to bandgap instance
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* @id - sensor id
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* @val - desired thot value
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*
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* returns 0 on success or the proper error code
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*/
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int omap_bandgap_write_thot(struct omap_bandgap *bg_ptr, int id, int val)
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{
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struct temp_sensor_data *ts_data;
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struct temp_sensor_registers *tsr;
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u32 t_hot;
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int ret;
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ret = omap_bandgap_validate(bg_ptr, id);
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if (ret)
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return ret;
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if (!OMAP_BANDGAP_HAS(bg_ptr, TALERT))
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return -ENOTSUPP;
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ts_data = bg_ptr->conf->sensors[id].ts_data;
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tsr = bg_ptr->conf->sensors[id].registers;
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if (val < ts_data->min_temp + ts_data->hyst_val)
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return -EINVAL;
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ret = temp_to_adc_conversion(val, bg_ptr, id, &t_hot);
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if (ret < 0)
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return ret;
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mutex_lock(&bg_ptr->bg_mutex);
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temp_sensor_configure_thot(bg_ptr, id, t_hot);
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mutex_unlock(&bg_ptr->bg_mutex);
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return 0;
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}
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/**
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|
* omap_bandgap_read_tcold() - reads sensor current tcold
|
|
* @bg_ptr - pointer to bandgap instance
|
|
* @id - sensor id
|
|
* @tcold - resulting current tcold value
|
|
*
|
|
* returns 0 on success or the proper error code
|
|
*/
|
|
int omap_bandgap_read_tcold(struct omap_bandgap *bg_ptr, int id,
|
|
int *tcold)
|
|
{
|
|
struct temp_sensor_registers *tsr;
|
|
u32 temp;
|
|
int ret;
|
|
|
|
ret = omap_bandgap_validate(bg_ptr, id);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (!OMAP_BANDGAP_HAS(bg_ptr, TALERT))
|
|
return -ENOTSUPP;
|
|
|
|
tsr = bg_ptr->conf->sensors[id].registers;
|
|
temp = omap_bandgap_readl(bg_ptr, tsr->bgap_threshold);
|
|
temp = (temp & tsr->threshold_tcold_mask)
|
|
>> __ffs(tsr->threshold_tcold_mask);
|
|
ret |= adc_to_temp_conversion(bg_ptr, id, temp, &temp);
|
|
if (ret)
|
|
return -EIO;
|
|
|
|
*tcold = temp;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* omap_bandgap_write_tcold() - sets the sensor tcold
|
|
* @bg_ptr - pointer to bandgap instance
|
|
* @id - sensor id
|
|
* @val - desired tcold value
|
|
*
|
|
* returns 0 on success or the proper error code
|
|
*/
|
|
int omap_bandgap_write_tcold(struct omap_bandgap *bg_ptr, int id, int val)
|
|
{
|
|
struct temp_sensor_data *ts_data;
|
|
struct temp_sensor_registers *tsr;
|
|
u32 t_cold;
|
|
int ret;
|
|
|
|
ret = omap_bandgap_validate(bg_ptr, id);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (!OMAP_BANDGAP_HAS(bg_ptr, TALERT))
|
|
return -ENOTSUPP;
|
|
|
|
ts_data = bg_ptr->conf->sensors[id].ts_data;
|
|
tsr = bg_ptr->conf->sensors[id].registers;
|
|
if (val > ts_data->max_temp + ts_data->hyst_val)
|
|
return -EINVAL;
|
|
|
|
ret = temp_to_adc_conversion(val, bg_ptr, id, &t_cold);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
mutex_lock(&bg_ptr->bg_mutex);
|
|
temp_sensor_configure_tcold(bg_ptr, id, t_cold);
|
|
mutex_unlock(&bg_ptr->bg_mutex);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* omap_bandgap_read_update_interval() - read the sensor update interval
|
|
* @bg_ptr - pointer to bandgap instance
|
|
* @id - sensor id
|
|
* @interval - resulting update interval in miliseconds
|
|
*
|
|
* returns 0 on success or the proper error code
|
|
*/
|
|
int omap_bandgap_read_update_interval(struct omap_bandgap *bg_ptr, int id,
|
|
int *interval)
|
|
{
|
|
struct temp_sensor_registers *tsr;
|
|
u32 time;
|
|
int ret;
|
|
|
|
ret = omap_bandgap_validate(bg_ptr, id);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (!OMAP_BANDGAP_HAS(bg_ptr, COUNTER))
|
|
return -ENOTSUPP;
|
|
|
|
tsr = bg_ptr->conf->sensors[id].registers;
|
|
time = omap_bandgap_readl(bg_ptr, tsr->bgap_counter);
|
|
if (ret)
|
|
return ret;
|
|
time = (time & tsr->counter_mask) >> __ffs(tsr->counter_mask);
|
|
time = time * 1000 / bg_ptr->clk_rate;
|
|
|
|
*interval = time;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* omap_bandgap_write_update_interval() - set the update interval
|
|
* @bg_ptr - pointer to bandgap instance
|
|
* @id - sensor id
|
|
* @interval - desired update interval in miliseconds
|
|
*
|
|
* returns 0 on success or the proper error code
|
|
*/
|
|
int omap_bandgap_write_update_interval(struct omap_bandgap *bg_ptr,
|
|
int id, u32 interval)
|
|
{
|
|
int ret = omap_bandgap_validate(bg_ptr, id);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (!OMAP_BANDGAP_HAS(bg_ptr, COUNTER))
|
|
return -ENOTSUPP;
|
|
|
|
interval = interval * bg_ptr->clk_rate / 1000;
|
|
mutex_lock(&bg_ptr->bg_mutex);
|
|
configure_temp_sensor_counter(bg_ptr, id, interval);
|
|
mutex_unlock(&bg_ptr->bg_mutex);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* omap_bandgap_read_temperature() - report current temperature
|
|
* @bg_ptr - pointer to bandgap instance
|
|
* @id - sensor id
|
|
* @temperature - resulting temperature
|
|
*
|
|
* returns 0 on success or the proper error code
|
|
*/
|
|
int omap_bandgap_read_temperature(struct omap_bandgap *bg_ptr, int id,
|
|
int *temperature)
|
|
{
|
|
struct temp_sensor_registers *tsr;
|
|
u32 temp;
|
|
int ret;
|
|
|
|
ret = omap_bandgap_validate(bg_ptr, id);
|
|
if (ret)
|
|
return ret;
|
|
|
|
tsr = bg_ptr->conf->sensors[id].registers;
|
|
temp = omap_bandgap_readl(bg_ptr, tsr->temp_sensor_ctrl);
|
|
temp &= tsr->bgap_dtemp_mask;
|
|
|
|
ret |= adc_to_temp_conversion(bg_ptr, id, temp, &temp);
|
|
if (ret)
|
|
return -EIO;
|
|
|
|
*temperature = temp;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* omap_bandgap_set_sensor_data() - helper function to store thermal
|
|
* framework related data.
|
|
* @bg_ptr - pointer to bandgap instance
|
|
* @id - sensor id
|
|
* @data - thermal framework related data to be stored
|
|
*
|
|
* returns 0 on success or the proper error code
|
|
*/
|
|
int omap_bandgap_set_sensor_data(struct omap_bandgap *bg_ptr, int id,
|
|
void *data)
|
|
{
|
|
int ret = omap_bandgap_validate(bg_ptr, id);
|
|
if (ret)
|
|
return ret;
|
|
|
|
bg_ptr->conf->sensors[id].data = data;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* omap_bandgap_get_sensor_data() - helper function to get thermal
|
|
* framework related data.
|
|
* @bg_ptr - pointer to bandgap instance
|
|
* @id - sensor id
|
|
*
|
|
* returns data stored by set function with sensor id on success or NULL
|
|
*/
|
|
void *omap_bandgap_get_sensor_data(struct omap_bandgap *bg_ptr, int id)
|
|
{
|
|
int ret = omap_bandgap_validate(bg_ptr, id);
|
|
if (ret)
|
|
return ERR_PTR(ret);
|
|
|
|
return bg_ptr->conf->sensors[id].data;
|
|
}
|
|
|
|
static int
|
|
omap_bandgap_force_single_read(struct omap_bandgap *bg_ptr, int id)
|
|
{
|
|
struct temp_sensor_registers *tsr;
|
|
u32 temp = 0, counter = 1000;
|
|
|
|
tsr = bg_ptr->conf->sensors[id].registers;
|
|
/* Select single conversion mode */
|
|
if (OMAP_BANDGAP_HAS(bg_ptr, MODE_CONFIG)) {
|
|
temp = omap_bandgap_readl(bg_ptr, tsr->bgap_mode_ctrl);
|
|
temp &= ~(1 << __ffs(tsr->mode_ctrl_mask));
|
|
omap_bandgap_writel(bg_ptr, temp, tsr->bgap_mode_ctrl);
|
|
}
|
|
|
|
/* Start of Conversion = 1 */
|
|
temp = omap_bandgap_readl(bg_ptr, tsr->temp_sensor_ctrl);
|
|
temp |= 1 << __ffs(tsr->bgap_soc_mask);
|
|
omap_bandgap_writel(bg_ptr, temp, tsr->temp_sensor_ctrl);
|
|
/* Wait until DTEMP is updated */
|
|
temp = omap_bandgap_readl(bg_ptr, tsr->temp_sensor_ctrl);
|
|
temp &= (tsr->bgap_dtemp_mask);
|
|
while ((temp == 0) && --counter) {
|
|
temp = omap_bandgap_readl(bg_ptr, tsr->temp_sensor_ctrl);
|
|
temp &= (tsr->bgap_dtemp_mask);
|
|
}
|
|
/* Start of Conversion = 0 */
|
|
temp = omap_bandgap_readl(bg_ptr, tsr->temp_sensor_ctrl);
|
|
temp &= ~(1 << __ffs(tsr->bgap_soc_mask));
|
|
omap_bandgap_writel(bg_ptr, temp, tsr->temp_sensor_ctrl);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* enable_continuous_mode() - One time enabling of continuous conversion mode
|
|
* @bg_ptr - pointer to scm instance
|
|
*
|
|
* Call this function only if HAS(MODE_CONFIG) is set
|
|
*/
|
|
static int enable_continuous_mode(struct omap_bandgap *bg_ptr)
|
|
{
|
|
struct temp_sensor_registers *tsr;
|
|
int i;
|
|
u32 val;
|
|
|
|
for (i = 0; i < bg_ptr->conf->sensor_count; i++) {
|
|
/* Perform a single read just before enabling continuous */
|
|
omap_bandgap_force_single_read(bg_ptr, i);
|
|
tsr = bg_ptr->conf->sensors[i].registers;
|
|
val = omap_bandgap_readl(bg_ptr, tsr->bgap_mode_ctrl);
|
|
val |= 1 << __ffs(tsr->mode_ctrl_mask);
|
|
omap_bandgap_writel(bg_ptr, val, tsr->bgap_mode_ctrl);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int omap_bandgap_tshut_init(struct omap_bandgap *bg_ptr,
|
|
struct platform_device *pdev)
|
|
{
|
|
int gpio_nr = bg_ptr->tshut_gpio;
|
|
int status;
|
|
|
|
/* Request for gpio_86 line */
|
|
status = gpio_request(gpio_nr, "tshut");
|
|
if (status < 0) {
|
|
dev_err(bg_ptr->dev,
|
|
"Could not request for TSHUT GPIO:%i\n", 86);
|
|
return status;
|
|
}
|
|
status = gpio_direction_input(gpio_nr);
|
|
if (status) {
|
|
dev_err(bg_ptr->dev,
|
|
"Cannot set input TSHUT GPIO %d\n", gpio_nr);
|
|
return status;
|
|
}
|
|
|
|
status = request_irq(gpio_to_irq(gpio_nr),
|
|
omap_bandgap_tshut_irq_handler,
|
|
IRQF_TRIGGER_RISING, "tshut",
|
|
NULL);
|
|
if (status) {
|
|
gpio_free(gpio_nr);
|
|
dev_err(bg_ptr->dev, "request irq failed for TSHUT");
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Initialization of Talert. Call it only if HAS(TALERT) is set */
|
|
static int omap_bandgap_talert_init(struct omap_bandgap *bg_ptr,
|
|
struct platform_device *pdev)
|
|
{
|
|
int ret;
|
|
|
|
bg_ptr->irq = platform_get_irq(pdev, 0);
|
|
if (bg_ptr->irq < 0) {
|
|
dev_err(&pdev->dev, "get_irq failed\n");
|
|
return bg_ptr->irq;
|
|
}
|
|
ret = request_threaded_irq(bg_ptr->irq, NULL,
|
|
talert_irq_handler,
|
|
IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
|
|
"talert", bg_ptr);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "Request threaded irq failed.\n");
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id of_omap_bandgap_match[];
|
|
static struct omap_bandgap *omap_bandgap_build(struct platform_device *pdev)
|
|
{
|
|
struct device_node *node = pdev->dev.of_node;
|
|
const struct of_device_id *of_id;
|
|
struct omap_bandgap *bg_ptr;
|
|
struct resource *res;
|
|
u32 prop;
|
|
int i;
|
|
|
|
/* just for the sake */
|
|
if (!node) {
|
|
dev_err(&pdev->dev, "no platform information available\n");
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
bg_ptr = devm_kzalloc(&pdev->dev, sizeof(struct omap_bandgap),
|
|
GFP_KERNEL);
|
|
if (!bg_ptr) {
|
|
dev_err(&pdev->dev, "Unable to allocate mem for driver ref\n");
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
|
|
of_id = of_match_device(of_omap_bandgap_match, &pdev->dev);
|
|
if (of_id)
|
|
bg_ptr->conf = of_id->data;
|
|
|
|
i = 0;
|
|
do {
|
|
void __iomem *chunk;
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, i);
|
|
if (!res)
|
|
break;
|
|
chunk = devm_request_and_ioremap(&pdev->dev, res);
|
|
if (i == 0)
|
|
bg_ptr->base = chunk;
|
|
if (!chunk) {
|
|
dev_err(&pdev->dev,
|
|
"failed to request the IO (%d:%pR).\n",
|
|
i, res);
|
|
return ERR_PTR(-EADDRNOTAVAIL);
|
|
}
|
|
i++;
|
|
} while (res);
|
|
|
|
if (OMAP_BANDGAP_HAS(bg_ptr, TSHUT)) {
|
|
if (of_property_read_u32(node, "ti,tshut-gpio", &prop) < 0) {
|
|
dev_err(&pdev->dev, "missing tshut gpio in device tree\n");
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
bg_ptr->tshut_gpio = prop;
|
|
if (!gpio_is_valid(bg_ptr->tshut_gpio)) {
|
|
dev_err(&pdev->dev, "invalid gpio for tshut (%d)\n",
|
|
bg_ptr->tshut_gpio);
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
}
|
|
|
|
return bg_ptr;
|
|
}
|
|
|
|
static
|
|
int __devinit omap_bandgap_probe(struct platform_device *pdev)
|
|
{
|
|
struct omap_bandgap *bg_ptr;
|
|
int clk_rate, ret = 0, i;
|
|
|
|
bg_ptr = omap_bandgap_build(pdev);
|
|
if (IS_ERR_OR_NULL(bg_ptr)) {
|
|
dev_err(&pdev->dev, "failed to fetch platform data\n");
|
|
return PTR_ERR(bg_ptr);
|
|
}
|
|
bg_ptr->dev = &pdev->dev;
|
|
|
|
if (OMAP_BANDGAP_HAS(bg_ptr, TSHUT)) {
|
|
ret = omap_bandgap_tshut_init(bg_ptr, pdev);
|
|
if (ret) {
|
|
dev_err(&pdev->dev,
|
|
"failed to initialize system tshut IRQ\n");
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
bg_ptr->fclock = clk_get(NULL, bg_ptr->conf->fclock_name);
|
|
ret = IS_ERR_OR_NULL(bg_ptr->fclock);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "failed to request fclock reference\n");
|
|
goto free_irqs;
|
|
}
|
|
|
|
bg_ptr->div_clk = clk_get(NULL, bg_ptr->conf->div_ck_name);
|
|
ret = IS_ERR_OR_NULL(bg_ptr->div_clk);
|
|
if (ret) {
|
|
dev_err(&pdev->dev,
|
|
"failed to request div_ts_ck clock ref\n");
|
|
goto free_irqs;
|
|
}
|
|
|
|
bg_ptr->conv_table = bg_ptr->conf->conv_table;
|
|
for (i = 0; i < bg_ptr->conf->sensor_count; i++) {
|
|
struct temp_sensor_registers *tsr;
|
|
u32 val;
|
|
|
|
tsr = bg_ptr->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 = omap_bandgap_readl(bg_ptr, tsr->bgap_efuse);
|
|
if (ret || !val)
|
|
dev_info(&pdev->dev,
|
|
"Non-trimmed BGAP, Temp not accurate\n");
|
|
}
|
|
|
|
clk_rate = clk_round_rate(bg_ptr->div_clk,
|
|
bg_ptr->conf->sensors[0].ts_data->max_freq);
|
|
if (clk_rate < bg_ptr->conf->sensors[0].ts_data->min_freq ||
|
|
clk_rate == 0xffffffff) {
|
|
ret = -ENODEV;
|
|
dev_err(&pdev->dev, "wrong clock rate (%d)\n", clk_rate);
|
|
goto put_clks;
|
|
}
|
|
|
|
ret = clk_set_rate(bg_ptr->div_clk, clk_rate);
|
|
if (ret)
|
|
dev_err(&pdev->dev, "Cannot re-set clock rate. Continuing\n");
|
|
|
|
bg_ptr->clk_rate = clk_rate;
|
|
clk_enable(bg_ptr->fclock);
|
|
|
|
mutex_init(&bg_ptr->bg_mutex);
|
|
bg_ptr->dev = &pdev->dev;
|
|
platform_set_drvdata(pdev, bg_ptr);
|
|
|
|
omap_bandgap_power(bg_ptr, true);
|
|
|
|
/* Set default counter to 1 for now */
|
|
if (OMAP_BANDGAP_HAS(bg_ptr, COUNTER))
|
|
for (i = 0; i < bg_ptr->conf->sensor_count; i++)
|
|
configure_temp_sensor_counter(bg_ptr, i, 1);
|
|
|
|
for (i = 0; i < bg_ptr->conf->sensor_count; i++) {
|
|
struct temp_sensor_data *ts_data;
|
|
|
|
ts_data = bg_ptr->conf->sensors[i].ts_data;
|
|
|
|
if (OMAP_BANDGAP_HAS(bg_ptr, TALERT))
|
|
temp_sensor_init_talert_thresholds(bg_ptr, i,
|
|
ts_data->t_hot,
|
|
ts_data->t_cold);
|
|
if (OMAP_BANDGAP_HAS(bg_ptr, TSHUT_CONFIG)) {
|
|
temp_sensor_configure_tshut_hot(bg_ptr, i,
|
|
ts_data->tshut_hot);
|
|
temp_sensor_configure_tshut_cold(bg_ptr, i,
|
|
ts_data->tshut_cold);
|
|
}
|
|
}
|
|
|
|
if (OMAP_BANDGAP_HAS(bg_ptr, MODE_CONFIG))
|
|
enable_continuous_mode(bg_ptr);
|
|
|
|
/* Set .250 seconds time as default counter */
|
|
if (OMAP_BANDGAP_HAS(bg_ptr, COUNTER))
|
|
for (i = 0; i < bg_ptr->conf->sensor_count; i++)
|
|
configure_temp_sensor_counter(bg_ptr, i,
|
|
bg_ptr->clk_rate / 4);
|
|
|
|
/* Every thing is good? Then expose the sensors */
|
|
for (i = 0; i < bg_ptr->conf->sensor_count; i++) {
|
|
char *domain;
|
|
|
|
domain = bg_ptr->conf->sensors[i].domain;
|
|
if (bg_ptr->conf->expose_sensor)
|
|
bg_ptr->conf->expose_sensor(bg_ptr, i, domain);
|
|
|
|
if (bg_ptr->conf->sensors[i].register_cooling)
|
|
bg_ptr->conf->sensors[i].register_cooling(bg_ptr, i);
|
|
}
|
|
|
|
/*
|
|
* 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 (OMAP_BANDGAP_HAS(bg_ptr, TALERT)) {
|
|
ret = omap_bandgap_talert_init(bg_ptr, pdev);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "failed to initialize Talert IRQ\n");
|
|
i = bg_ptr->conf->sensor_count;
|
|
goto disable_clk;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
|
|
disable_clk:
|
|
clk_disable(bg_ptr->fclock);
|
|
put_clks:
|
|
clk_put(bg_ptr->fclock);
|
|
clk_put(bg_ptr->div_clk);
|
|
free_irqs:
|
|
if (OMAP_BANDGAP_HAS(bg_ptr, TSHUT)) {
|
|
free_irq(gpio_to_irq(bg_ptr->tshut_gpio), NULL);
|
|
gpio_free(bg_ptr->tshut_gpio);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static
|
|
int __devexit omap_bandgap_remove(struct platform_device *pdev)
|
|
{
|
|
struct omap_bandgap *bg_ptr = platform_get_drvdata(pdev);
|
|
int i;
|
|
|
|
/* First thing is to remove sensor interfaces */
|
|
for (i = 0; i < bg_ptr->conf->sensor_count; i++) {
|
|
if (bg_ptr->conf->sensors[i].register_cooling)
|
|
bg_ptr->conf->sensors[i].unregister_cooling(bg_ptr, i);
|
|
|
|
if (bg_ptr->conf->remove_sensor)
|
|
bg_ptr->conf->remove_sensor(bg_ptr, i);
|
|
}
|
|
|
|
omap_bandgap_power(bg_ptr, false);
|
|
|
|
clk_disable(bg_ptr->fclock);
|
|
clk_put(bg_ptr->fclock);
|
|
clk_put(bg_ptr->div_clk);
|
|
|
|
if (OMAP_BANDGAP_HAS(bg_ptr, TALERT))
|
|
free_irq(bg_ptr->irq, bg_ptr);
|
|
|
|
if (OMAP_BANDGAP_HAS(bg_ptr, TSHUT)) {
|
|
free_irq(gpio_to_irq(bg_ptr->tshut_gpio), NULL);
|
|
gpio_free(bg_ptr->tshut_gpio);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM
|
|
static int omap_bandgap_save_ctxt(struct omap_bandgap *bg_ptr)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < bg_ptr->conf->sensor_count; i++) {
|
|
struct temp_sensor_registers *tsr;
|
|
struct temp_sensor_regval *rval;
|
|
|
|
rval = &bg_ptr->conf->sensors[i].regval;
|
|
tsr = bg_ptr->conf->sensors[i].registers;
|
|
|
|
if (OMAP_BANDGAP_HAS(bg_ptr, MODE_CONFIG))
|
|
rval->bg_mode_ctrl = omap_bandgap_readl(bg_ptr,
|
|
tsr->bgap_mode_ctrl);
|
|
if (OMAP_BANDGAP_HAS(bg_ptr, COUNTER))
|
|
rval->bg_counter = omap_bandgap_readl(bg_ptr,
|
|
tsr->bgap_counter);
|
|
if (OMAP_BANDGAP_HAS(bg_ptr, TALERT)) {
|
|
rval->bg_threshold = omap_bandgap_readl(bg_ptr,
|
|
tsr->bgap_threshold);
|
|
rval->bg_ctrl = omap_bandgap_readl(bg_ptr,
|
|
tsr->bgap_mask_ctrl);
|
|
}
|
|
|
|
if (OMAP_BANDGAP_HAS(bg_ptr, TSHUT_CONFIG))
|
|
rval->tshut_threshold = omap_bandgap_readl(bg_ptr,
|
|
tsr->tshut_threshold);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int omap_bandgap_restore_ctxt(struct omap_bandgap *bg_ptr)
|
|
{
|
|
int i;
|
|
u32 temp = 0;
|
|
|
|
for (i = 0; i < bg_ptr->conf->sensor_count; i++) {
|
|
struct temp_sensor_registers *tsr;
|
|
struct temp_sensor_regval *rval;
|
|
u32 val = 0;
|
|
|
|
rval = &bg_ptr->conf->sensors[i].regval;
|
|
tsr = bg_ptr->conf->sensors[i].registers;
|
|
|
|
if (OMAP_BANDGAP_HAS(bg_ptr, COUNTER))
|
|
val = omap_bandgap_readl(bg_ptr, tsr->bgap_counter);
|
|
|
|
if (val == 0) {
|
|
if (OMAP_BANDGAP_HAS(bg_ptr, TSHUT_CONFIG))
|
|
omap_bandgap_writel(bg_ptr, rval->tshut_threshold,
|
|
tsr->tshut_threshold);
|
|
/* Force immediate temperature measurement and update
|
|
* of the DTEMP field
|
|
*/
|
|
omap_bandgap_force_single_read(bg_ptr, i);
|
|
|
|
if (OMAP_BANDGAP_HAS(bg_ptr, COUNTER))
|
|
omap_bandgap_writel(bg_ptr, rval->bg_counter,
|
|
tsr->bgap_counter);
|
|
if (OMAP_BANDGAP_HAS(bg_ptr, MODE_CONFIG))
|
|
omap_bandgap_writel(bg_ptr, rval->bg_mode_ctrl,
|
|
tsr->bgap_mode_ctrl);
|
|
if (OMAP_BANDGAP_HAS(bg_ptr, TALERT)) {
|
|
omap_bandgap_writel(bg_ptr,
|
|
rval->bg_threshold,
|
|
tsr->bgap_threshold);
|
|
omap_bandgap_writel(bg_ptr, rval->bg_ctrl,
|
|
tsr->bgap_mask_ctrl);
|
|
}
|
|
} else {
|
|
temp = omap_bandgap_readl(bg_ptr,
|
|
tsr->temp_sensor_ctrl);
|
|
temp &= (tsr->bgap_dtemp_mask);
|
|
omap_bandgap_force_single_read(bg_ptr, i);
|
|
if (temp == 0 && OMAP_BANDGAP_HAS(bg_ptr, TALERT)) {
|
|
temp = omap_bandgap_readl(bg_ptr,
|
|
tsr->bgap_mask_ctrl);
|
|
temp |= 1 << __ffs(tsr->mode_ctrl_mask);
|
|
omap_bandgap_writel(bg_ptr, temp,
|
|
tsr->bgap_mask_ctrl);
|
|
}
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int omap_bandgap_suspend(struct device *dev)
|
|
{
|
|
struct omap_bandgap *bg_ptr = dev_get_drvdata(dev);
|
|
int err;
|
|
|
|
err = omap_bandgap_save_ctxt(bg_ptr);
|
|
omap_bandgap_power(bg_ptr, false);
|
|
clk_disable(bg_ptr->fclock);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int omap_bandgap_resume(struct device *dev)
|
|
{
|
|
struct omap_bandgap *bg_ptr = dev_get_drvdata(dev);
|
|
|
|
clk_enable(bg_ptr->fclock);
|
|
omap_bandgap_power(bg_ptr, true);
|
|
|
|
return omap_bandgap_restore_ctxt(bg_ptr);
|
|
}
|
|
static const struct dev_pm_ops omap_bandgap_dev_pm_ops = {
|
|
SET_SYSTEM_SLEEP_PM_OPS(omap_bandgap_suspend,
|
|
omap_bandgap_resume)
|
|
};
|
|
|
|
#define DEV_PM_OPS (&omap_bandgap_dev_pm_ops)
|
|
#else
|
|
#define DEV_PM_OPS NULL
|
|
#endif
|
|
|
|
static const struct of_device_id of_omap_bandgap_match[] = {
|
|
#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
|
|
/* Sentinel */
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(of, of_omap_bandgap_match);
|
|
|
|
static struct platform_driver omap_bandgap_sensor_driver = {
|
|
.probe = omap_bandgap_probe,
|
|
.remove = omap_bandgap_remove,
|
|
.driver = {
|
|
.name = "omap-bandgap",
|
|
.pm = DEV_PM_OPS,
|
|
.of_match_table = of_omap_bandgap_match,
|
|
},
|
|
};
|
|
|
|
module_platform_driver(omap_bandgap_sensor_driver);
|
|
|
|
MODULE_DESCRIPTION("OMAP4+ bandgap temperature sensor driver");
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_ALIAS("platform:omap-bandgap");
|
|
MODULE_AUTHOR("Texas Instrument Inc.");
|