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Message-ID: <1342039269-13968-2-git-send-email-eduardo.valentin@ti.com>
Date: Wed, 11 Jul 2012 23:41:06 +0300
From: Eduardo Valentin <eduardo.valentin@...com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC: <devel@...verdev.osuosl.org>, <linux-kernel@...r.kernel.org>,
<j-keerthy@...com>, <grant.likely@...retlab.ca>,
<b-cousson@...com>, <kbaidarov@....rtsoft.ru>,
Eduardo Valentin <eduardo.valentin@...com>
Subject: [PATCHv3 1/4] staging: OMAP4+: thermal: introduce bandgap temperature sensor
In the System Control Module, OMAP supplies a voltage reference
and a temperature sensor feature that are gathered in the band
gap voltage and temperature sensor (VBGAPTS) module. The band
gap provides current and voltage reference for its internal
circuits and other analog IP blocks. The analog-to-digital
converter (ADC) produces an output value that is proportional
to the silicon temperature.
This patch provides a platform driver which expose this feature.
It is moduled as a MFD child of the System Control Module core
MFD driver.
This driver provides only APIs to access the device properties,
like temperature, thresholds and update rate.
Signed-off-by: Eduardo Valentin <eduardo.valentin@...com>
Signed-off-by: J Keerthy <j-keerthy@...com>
---
drivers/staging/Kconfig | 2 +
drivers/staging/Makefile | 1 +
drivers/staging/omap-thermal/Kconfig | 10 +
drivers/staging/omap-thermal/Makefile | 2 +
drivers/staging/omap-thermal/TODO | 27 +
drivers/staging/omap-thermal/omap-bandgap.c | 1166 +++++++++++++++++++++++++
drivers/staging/omap-thermal/omap-bandgap.h | 425 +++++++++
drivers/staging/omap-thermal/omap_bandgap.txt | 30 +
8 files changed, 1663 insertions(+), 0 deletions(-)
create mode 100644 drivers/staging/omap-thermal/Kconfig
create mode 100644 drivers/staging/omap-thermal/Makefile
create mode 100644 drivers/staging/omap-thermal/TODO
create mode 100644 drivers/staging/omap-thermal/omap-bandgap.c
create mode 100644 drivers/staging/omap-thermal/omap-bandgap.h
create mode 100644 drivers/staging/omap-thermal/omap_bandgap.txt
Patch changelog:
Change from V1 to V2:
- Compilation fixes on Kconfig and Makefiles under drivers/staging
Change from V2 to V3:
- Removed empty line from end of Kconfig file, so git is happy while applying
- Keerthy's SOB now matches Copyright notice found in files
diff --git a/drivers/staging/Kconfig b/drivers/staging/Kconfig
index d3934d7..e3402d5 100644
--- a/drivers/staging/Kconfig
+++ b/drivers/staging/Kconfig
@@ -134,4 +134,6 @@ source "drivers/staging/gdm72xx/Kconfig"
source "drivers/staging/csr/Kconfig"
+source "drivers/staging/omap-thermal/Kconfig"
+
endif # STAGING
diff --git a/drivers/staging/Makefile b/drivers/staging/Makefile
index 5b2219a..dbbdbbc 100644
--- a/drivers/staging/Makefile
+++ b/drivers/staging/Makefile
@@ -59,3 +59,4 @@ obj-$(CONFIG_USB_WPAN_HCD) += ozwpan/
obj-$(CONFIG_USB_G_CCG) += ccg/
obj-$(CONFIG_WIMAX_GDM72XX) += gdm72xx/
obj-$(CONFIG_CSR_WIFI) += csr/
+obj-y += omap-thermal/
diff --git a/drivers/staging/omap-thermal/Kconfig b/drivers/staging/omap-thermal/Kconfig
new file mode 100644
index 0000000..8096250
--- /dev/null
+++ b/drivers/staging/omap-thermal/Kconfig
@@ -0,0 +1,10 @@
+config OMAP_BANDGAP
+ tristate "Texas Instruments OMAP4+ temperature sensor driver"
+ depends on THERMAL
+ help
+ If you say yes here you get support for the Texas Instruments
+ OMAP4460+ on die bandgap temperature sensor support. The register
+ set is part of system control module.
+
+ This includes alert interrupts generation and also the TSHUT
+ support.
diff --git a/drivers/staging/omap-thermal/Makefile b/drivers/staging/omap-thermal/Makefile
new file mode 100644
index 0000000..c92a854
--- /dev/null
+++ b/drivers/staging/omap-thermal/Makefile
@@ -0,0 +1,2 @@
+obj-$(CONFIG_OMAP_BANDGAP) += omap-thermal.o
+omap-thermal-y := omap-bandgap.o
diff --git a/drivers/staging/omap-thermal/TODO b/drivers/staging/omap-thermal/TODO
new file mode 100644
index 0000000..77b761b
--- /dev/null
+++ b/drivers/staging/omap-thermal/TODO
@@ -0,0 +1,27 @@
+List of TODOs (by Eduardo Valentin)
+
+on omap-bandgap.c:
+- Rework locking
+- Improve driver code by adding usage of regmap-mmio
+- Test every exposed API to userland
+- Add support to hwmon
+- Review and revisit all API exposed
+- Revisit PM support
+- Revisit data structures and simplify them
+- Once SCM-core api settles, update this driver accordingly
+
+on omap-thermal-common.c/omap-thermal.h:
+- Revisit extrapolation constants for O4/O5
+- Revisit need for locking
+- Revisit trips and its definitions
+- Revisit trending
+
+on omap5-thermal.c
+- Add support for GPU cooling
+
+generally:
+- make checkpatch.pl and sparse happy
+- make sure this code works on OMAP4430, OMAP4460 and OMAP5430
+- update documentation
+
+Copy patches to Eduardo Valentin <eduardo.valentin@...com>
diff --git a/drivers/staging/omap-thermal/omap-bandgap.c b/drivers/staging/omap-thermal/omap-bandgap.c
new file mode 100644
index 0000000..3b2cd87
--- /dev/null
+++ b/drivers/staging/omap-thermal/omap-bandgap.c
@@ -0,0 +1,1166 @@
+/*
+ * OMAP4 Bandgap temperature sensor driver
+ *
+ * Copyright (C) 2011-2012 Texas Instruments Incorporated - http://www.ti.com/
+ * Author: J Keerthy <j-keerthy@...com>
+ * Author: Moiz Sonasath <m-sonasath@...com>
+ * Couple of fixes, DT and MFD adaptation:
+ * Eduardo Valentin <eduardo.valentin@...com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/export.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/interrupt.h>
+#include <linux/clk.h>
+#include <linux/gpio.h>
+#include <linux/platform_device.h>
+#include <linux/err.h>
+#include <linux/types.h>
+#include <linux/mutex.h>
+#include <linux/reboot.h>
+#include <linux/of_platform.h>
+#include <linux/of_irq.h>
+
+#include "omap-bandgap.h"
+
+static u32 omap_bandgap_readl(struct omap_bandgap *bg_ptr, u32 reg)
+{
+ return readl(bg_ptr->base + reg);
+}
+
+static void omap_bandgap_writel(struct omap_bandgap *bg_ptr, u32 val, u32 reg)
+{
+ writel(val, bg_ptr->base + reg);
+}
+
+static int omap_bandgap_power(struct omap_bandgap *bg_ptr, bool on)
+{
+ struct temp_sensor_registers *tsr;
+ int i;
+ u32 ctrl;
+
+ if (!OMAP_BANDGAP_HAS(bg_ptr, POWER_SWITCH))
+ return 0;
+
+ for (i = 0; i < bg_ptr->conf->sensor_count; i++) {
+ tsr = bg_ptr->conf->sensors[i].registers;
+ ctrl = omap_bandgap_readl(bg_ptr, tsr->temp_sensor_ctrl);
+ ctrl &= ~tsr->bgap_tempsoff_mask;
+ /* active on 0 */
+ ctrl |= !on << __ffs(tsr->bgap_tempsoff_mask);
+
+ /* write BGAP_TEMPSOFF should be reset to 0 */
+ omap_bandgap_writel(bg_ptr, ctrl, tsr->temp_sensor_ctrl);
+ }
+
+ return 0;
+}
+
+/* This is the Talert handler. Call it only if HAS(TALERT) is set */
+static irqreturn_t talert_irq_handler(int irq, void *data)
+{
+ struct omap_bandgap *bg_ptr = data;
+ struct temp_sensor_registers *tsr;
+ u32 t_hot = 0, t_cold = 0, temp, ctrl;
+ int i;
+
+ bg_ptr = data;
+ /* Read the status of t_hot */
+ for (i = 0; i < bg_ptr->conf->sensor_count; i++) {
+ tsr = bg_ptr->conf->sensors[i].registers;
+ t_hot = omap_bandgap_readl(bg_ptr, tsr->bgap_status);
+ t_hot &= tsr->status_hot_mask;
+
+ /* Read the status of t_cold */
+ t_cold = omap_bandgap_readl(bg_ptr, tsr->bgap_status);
+ t_cold &= tsr->status_cold_mask;
+
+ if (!t_cold && !t_hot)
+ continue;
+
+ ctrl = omap_bandgap_readl(bg_ptr, tsr->bgap_mask_ctrl);
+ /*
+ * One TALERT interrupt: Two sources
+ * If the interrupt is due to t_hot then mask t_hot and
+ * and unmask t_cold else mask t_cold and unmask t_hot
+ */
+ if (t_hot) {
+ ctrl &= ~tsr->mask_hot_mask;
+ ctrl |= tsr->mask_cold_mask;
+ } else if (t_cold) {
+ ctrl &= ~tsr->mask_cold_mask;
+ ctrl |= tsr->mask_hot_mask;
+ }
+
+ omap_bandgap_writel(bg_ptr, ctrl, tsr->bgap_mask_ctrl);
+
+ /* read temperature */
+ temp = omap_bandgap_readl(bg_ptr, tsr->temp_sensor_ctrl);
+ temp &= tsr->bgap_dtemp_mask;
+
+ /* report temperature to whom may concern */
+ if (bg_ptr->conf->report_temperature)
+ bg_ptr->conf->report_temperature(bg_ptr, i);
+ }
+
+ return IRQ_HANDLED;
+}
+
+/* This is the Tshut handler. Call it only if HAS(TSHUT) is set */
+static irqreturn_t omap_bandgap_tshut_irq_handler(int irq, void *data)
+{
+ orderly_poweroff(true);
+
+ return IRQ_HANDLED;
+}
+
+static
+int adc_to_temp_conversion(struct omap_bandgap *bg_ptr, int id, int adc_val,
+ int *t)
+{
+ struct temp_sensor_data *ts_data = bg_ptr->conf->sensors[id].ts_data;
+
+ /* look up for temperature in the table and return the temperature */
+ if (adc_val < ts_data->adc_start_val || adc_val > ts_data->adc_end_val)
+ return -ERANGE;
+
+ *t = bg_ptr->conv_table[adc_val - ts_data->adc_start_val];
+
+ return 0;
+}
+
+static int temp_to_adc_conversion(long temp, struct omap_bandgap *bg_ptr, int i,
+ int *adc)
+{
+ struct temp_sensor_data *ts_data = bg_ptr->conf->sensors[i].ts_data;
+ int high, low, mid;
+
+ low = 0;
+ high = ts_data->adc_end_val - ts_data->adc_start_val;
+ mid = (high + low) / 2;
+
+ if (temp < bg_ptr->conv_table[high] || temp > bg_ptr->conv_table[high])
+ return -EINVAL;
+
+ while (low < high) {
+ if (temp < bg_ptr->conv_table[mid])
+ high = mid - 1;
+ else
+ low = mid + 1;
+ mid = (low + high) / 2;
+ }
+
+ *adc = ts_data->adc_start_val + low;
+
+ return 0;
+}
+
+/* Talert masks. Call it only if HAS(TALERT) is set */
+static int temp_sensor_unmask_interrupts(struct omap_bandgap *bg_ptr, int id,
+ u32 t_hot, u32 t_cold)
+{
+ struct temp_sensor_registers *tsr;
+ u32 temp, reg_val;
+
+ /* Read the current on die temperature */
+ tsr = bg_ptr->conf->sensors[id].registers;
+ temp = omap_bandgap_readl(bg_ptr, tsr->temp_sensor_ctrl);
+ temp &= tsr->bgap_dtemp_mask;
+
+ reg_val = omap_bandgap_readl(bg_ptr, tsr->bgap_mask_ctrl);
+ if (temp < t_hot)
+ reg_val |= tsr->mask_hot_mask;
+ else
+ reg_val &= ~tsr->mask_hot_mask;
+
+ if (t_cold < temp)
+ reg_val |= tsr->mask_cold_mask;
+ else
+ reg_val &= ~tsr->mask_cold_mask;
+ omap_bandgap_writel(bg_ptr, reg_val, tsr->bgap_mask_ctrl);
+
+ return 0;
+}
+
+static
+int add_hyst(int adc_val, int hyst_val, struct omap_bandgap *bg_ptr, int i,
+ u32 *sum)
+{
+ int temp, ret;
+
+ ret = adc_to_temp_conversion(bg_ptr, i, adc_val, &temp);
+ if (ret < 0)
+ return ret;
+
+ temp += hyst_val;
+
+ return temp_to_adc_conversion(temp, bg_ptr, i, sum);
+}
+
+/* Talert Thot threshold. Call it only if HAS(TALERT) is set */
+static
+int temp_sensor_configure_thot(struct omap_bandgap *bg_ptr, int id, int t_hot)
+{
+ struct temp_sensor_data *ts_data = bg_ptr->conf->sensors[id].ts_data;
+ struct temp_sensor_registers *tsr;
+ u32 thresh_val, reg_val;
+ int cold, err;
+
+ tsr = bg_ptr->conf->sensors[id].registers;
+
+ /* obtain the T cold value */
+ thresh_val = omap_bandgap_readl(bg_ptr, tsr->bgap_threshold);
+ cold = (thresh_val & tsr->threshold_tcold_mask) >>
+ __ffs(tsr->threshold_tcold_mask);
+ if (t_hot <= cold) {
+ /* change the t_cold to t_hot - 5000 millidegrees */
+ err |= add_hyst(t_hot, -ts_data->hyst_val, bg_ptr, id, &cold);
+ /* write the new t_cold value */
+ reg_val = thresh_val & (~tsr->threshold_tcold_mask);
+ reg_val |= cold << __ffs(tsr->threshold_tcold_mask);
+ omap_bandgap_writel(bg_ptr, reg_val, tsr->bgap_threshold);
+ thresh_val = reg_val;
+ }
+
+ /* write the new t_hot value */
+ reg_val = thresh_val & ~tsr->threshold_thot_mask;
+ reg_val |= (t_hot << __ffs(tsr->threshold_thot_mask));
+ omap_bandgap_writel(bg_ptr, reg_val, tsr->bgap_threshold);
+ if (err) {
+ dev_err(bg_ptr->dev, "failed to reprogram thot threshold\n");
+ return -EIO;
+ }
+
+ return temp_sensor_unmask_interrupts(bg_ptr, id, t_hot, cold);
+}
+
+/* Talert Thot and Tcold thresholds. Call it only if HAS(TALERT) is set */
+static
+int temp_sensor_init_talert_thresholds(struct omap_bandgap *bg_ptr, int id,
+ int t_hot, int t_cold)
+{
+ struct temp_sensor_registers *tsr;
+ u32 reg_val, thresh_val;
+
+ tsr = bg_ptr->conf->sensors[id].registers;
+ thresh_val = omap_bandgap_readl(bg_ptr, tsr->bgap_threshold);
+
+ /* write the new t_cold value */
+ reg_val = thresh_val & ~tsr->threshold_tcold_mask;
+ reg_val |= (t_cold << __ffs(tsr->threshold_tcold_mask));
+ omap_bandgap_writel(bg_ptr, reg_val, tsr->bgap_threshold);
+
+ thresh_val = omap_bandgap_readl(bg_ptr, tsr->bgap_threshold);
+
+ /* write the new t_hot value */
+ reg_val = thresh_val & ~tsr->threshold_thot_mask;
+ reg_val |= (t_hot << __ffs(tsr->threshold_thot_mask));
+ omap_bandgap_writel(bg_ptr, reg_val, tsr->bgap_threshold);
+
+ reg_val = omap_bandgap_readl(bg_ptr, tsr->bgap_mask_ctrl);
+ reg_val |= tsr->mask_hot_mask;
+ reg_val |= tsr->mask_cold_mask;
+ omap_bandgap_writel(bg_ptr, reg_val, tsr->bgap_mask_ctrl);
+
+ return 0;
+}
+
+/* Talert Tcold threshold. Call it only if HAS(TALERT) is set */
+static
+int temp_sensor_configure_tcold(struct omap_bandgap *bg_ptr, int id,
+ int t_cold)
+{
+ struct temp_sensor_data *ts_data = bg_ptr->conf->sensors[id].ts_data;
+ struct temp_sensor_registers *tsr;
+ u32 thresh_val, reg_val;
+ int hot, err = 0;
+
+ tsr = bg_ptr->conf->sensors[id].registers;
+ /* obtain the T cold value */
+ thresh_val = omap_bandgap_readl(bg_ptr, tsr->bgap_threshold);
+ hot = (thresh_val & tsr->threshold_thot_mask) >>
+ __ffs(tsr->threshold_thot_mask);
+
+ if (t_cold >= hot) {
+ /* change the t_hot to t_cold + 5000 millidegrees */
+ err |= add_hyst(t_cold, ts_data->hyst_val, bg_ptr, id, &hot);
+ /* write the new t_hot value */
+ reg_val = thresh_val & (~tsr->threshold_thot_mask);
+ reg_val |= hot << __ffs(tsr->threshold_thot_mask);
+ omap_bandgap_writel(bg_ptr, reg_val, tsr->bgap_threshold);
+ thresh_val = reg_val;
+ }
+
+ /* write the new t_cold value */
+ reg_val = thresh_val & ~tsr->threshold_tcold_mask;
+ reg_val |= (t_cold << __ffs(tsr->threshold_tcold_mask));
+ omap_bandgap_writel(bg_ptr, reg_val, tsr->bgap_threshold);
+ if (err) {
+ dev_err(bg_ptr->dev, "failed to reprogram tcold threshold\n");
+ return -EIO;
+ }
+
+ return temp_sensor_unmask_interrupts(bg_ptr, id, hot, t_cold);
+}
+
+/* This is Tshut Thot config. Call it only if HAS(TSHUT_CONFIG) is set */
+static int temp_sensor_configure_tshut_hot(struct omap_bandgap *bg_ptr,
+ int id, int tshut_hot)
+{
+ struct temp_sensor_registers *tsr;
+ u32 reg_val;
+
+ tsr = bg_ptr->conf->sensors[id].registers;
+ reg_val = omap_bandgap_readl(bg_ptr, tsr->tshut_threshold);
+ reg_val &= ~tsr->tshut_hot_mask;
+ reg_val |= tshut_hot << __ffs(tsr->tshut_hot_mask);
+ omap_bandgap_writel(bg_ptr, reg_val, tsr->tshut_threshold);
+
+ return 0;
+}
+
+/* This is Tshut Tcold config. Call it only if HAS(TSHUT_CONFIG) is set */
+static int temp_sensor_configure_tshut_cold(struct omap_bandgap *bg_ptr,
+ int id, int tshut_cold)
+{
+ struct temp_sensor_registers *tsr;
+ u32 reg_val;
+
+ tsr = bg_ptr->conf->sensors[id].registers;
+ reg_val = omap_bandgap_readl(bg_ptr, tsr->tshut_threshold);
+ reg_val &= ~tsr->tshut_cold_mask;
+ reg_val |= tshut_cold << __ffs(tsr->tshut_cold_mask);
+ omap_bandgap_writel(bg_ptr, reg_val, tsr->tshut_threshold);
+
+ return 0;
+}
+
+/* This is counter config. Call it only if HAS(COUNTER) is set */
+static int configure_temp_sensor_counter(struct omap_bandgap *bg_ptr, int id,
+ u32 counter)
+{
+ struct temp_sensor_registers *tsr;
+ u32 val;
+
+ tsr = bg_ptr->conf->sensors[id].registers;
+ val = omap_bandgap_readl(bg_ptr, tsr->bgap_counter);
+ val &= ~tsr->counter_mask;
+ val |= counter << __ffs(tsr->counter_mask);
+ omap_bandgap_writel(bg_ptr, val, tsr->bgap_counter);
+
+ return 0;
+}
+
+#define bandgap_is_valid(b) \
+ (!IS_ERR_OR_NULL(b))
+#define bandgap_is_valid_sensor_id(b, i) \
+ ((i) >= 0 && (i) < (b)->conf->sensor_count)
+static inline int omap_bandgap_validate(struct omap_bandgap *bg_ptr, int id)
+{
+ if (!bandgap_is_valid(bg_ptr)) {
+ pr_err("%s: invalid bandgap pointer\n", __func__);
+ return -EINVAL;
+ }
+
+ if (!bandgap_is_valid_sensor_id(bg_ptr, id)) {
+ dev_err(bg_ptr->dev, "%s: sensor id out of range (%d)\n",
+ __func__, id);
+ return -ERANGE;
+ }
+
+ return 0;
+}
+
+/* Exposed APIs */
+/**
+ * omap_bandgap_read_thot() - reads sensor current thot
+ * @bg_ptr - pointer to bandgap instance
+ * @id - sensor id
+ * @thot - resulting current thot value
+ *
+ * returns 0 on success or the proper error code
+ */
+int omap_bandgap_read_thot(struct omap_bandgap *bg_ptr, int id,
+ int *thot)
+{
+ 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_thot_mask) >>
+ __ffs(tsr->threshold_thot_mask);
+ ret |= adc_to_temp_conversion(bg_ptr, id, temp, &temp);
+ if (ret) {
+ dev_err(bg_ptr->dev, "failed to read thot\n");
+ return -EIO;
+ }
+
+ *thot = temp;
+
+ return 0;
+}
+
+/**
+ * omap_bandgap_write_thot() - sets sensor current thot
+ * @bg_ptr - pointer to bandgap instance
+ * @id - sensor id
+ * @val - desired thot value
+ *
+ * returns 0 on success or the proper error code
+ */
+int omap_bandgap_write_thot(struct omap_bandgap *bg_ptr, int id, int val)
+{
+ struct temp_sensor_data *ts_data;
+ struct temp_sensor_registers *tsr;
+ u32 t_hot;
+ 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->min_temp + ts_data->hyst_val)
+ return -EINVAL;
+ ret = temp_to_adc_conversion(val, bg_ptr, id, &t_hot);
+ if (ret < 0)
+ return ret;
+
+ mutex_lock(&bg_ptr->bg_mutex);
+ temp_sensor_configure_thot(bg_ptr, id, t_hot);
+ mutex_unlock(&bg_ptr->bg_mutex);
+
+ return 0;
+}
+
+/**
+ * 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[] = {
+ /* 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.");
diff --git a/drivers/staging/omap-thermal/omap-bandgap.h b/drivers/staging/omap-thermal/omap-bandgap.h
new file mode 100644
index 0000000..8b9883d
--- /dev/null
+++ b/drivers/staging/omap-thermal/omap-bandgap.h
@@ -0,0 +1,425 @@
+/*
+ * OMAP4 Bandgap temperature sensor driver
+ *
+ * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
+ * Contact:
+ * Eduardo Valentin <eduardo.valentin@...com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ *
+ */
+#ifndef __OMAP_BANDGAP_H
+#define __OMAP_BANDGAP_H
+
+#include <linux/mutex.h>
+#include <linux/types.h>
+#include <linux/err.h>
+
+/* TEMP_SENSOR OMAP4430 */
+#define OMAP4430_BGAP_TSHUT_SHIFT 11
+#define OMAP4430_BGAP_TSHUT_MASK (1 << 11)
+
+/* TEMP_SENSOR OMAP4430 */
+#define OMAP4430_BGAP_TEMPSOFF_SHIFT 12
+#define OMAP4430_BGAP_TEMPSOFF_MASK (1 << 12)
+#define OMAP4430_SINGLE_MODE_SHIFT 10
+#define OMAP4430_SINGLE_MODE_MASK (1 << 10)
+#define OMAP4430_BGAP_TEMP_SENSOR_SOC_SHIFT 9
+#define OMAP4430_BGAP_TEMP_SENSOR_SOC_MASK (1 << 9)
+#define OMAP4430_BGAP_TEMP_SENSOR_EOCZ_SHIFT 8
+#define OMAP4430_BGAP_TEMP_SENSOR_EOCZ_MASK (1 << 8)
+#define OMAP4430_BGAP_TEMP_SENSOR_DTEMP_SHIFT 0
+#define OMAP4430_BGAP_TEMP_SENSOR_DTEMP_MASK (0xff << 0)
+
+#define OMAP4430_ADC_START_VALUE 0
+#define OMAP4430_ADC_END_VALUE 127
+#define OMAP4430_MAX_FREQ 32768
+#define OMAP4430_MIN_FREQ 32768
+#define OMAP4430_MIN_TEMP -40000
+#define OMAP4430_MAX_TEMP 125000
+#define OMAP4430_HYST_VAL 5000
+
+/* TEMP_SENSOR OMAP4460 */
+#define OMAP4460_BGAP_TEMPSOFF_SHIFT 13
+#define OMAP4460_BGAP_TEMPSOFF_MASK (1 << 13)
+#define OMAP4460_BGAP_TEMP_SENSOR_SOC_SHIFT 11
+#define OMAP4460_BGAP_TEMP_SENSOR_SOC_MASK (1 << 11)
+#define OMAP4460_BGAP_TEMP_SENSOR_EOCZ_SHIFT 10
+#define OMAP4460_BGAP_TEMP_SENSOR_EOCZ_MASK (1 << 10)
+#define OMAP4460_BGAP_TEMP_SENSOR_DTEMP_SHIFT 0
+#define OMAP4460_BGAP_TEMP_SENSOR_DTEMP_MASK (0x3ff << 0)
+
+/* BANDGAP_CTRL */
+#define OMAP4460_SINGLE_MODE_SHIFT 31
+#define OMAP4460_SINGLE_MODE_MASK (1 << 31)
+#define OMAP4460_MASK_HOT_SHIFT 1
+#define OMAP4460_MASK_HOT_MASK (1 << 1)
+#define OMAP4460_MASK_COLD_SHIFT 0
+#define OMAP4460_MASK_COLD_MASK (1 << 0)
+
+/* BANDGAP_COUNTER */
+#define OMAP4460_COUNTER_SHIFT 0
+#define OMAP4460_COUNTER_MASK (0xffffff << 0)
+
+/* BANDGAP_THRESHOLD */
+#define OMAP4460_T_HOT_SHIFT 16
+#define OMAP4460_T_HOT_MASK (0x3ff << 16)
+#define OMAP4460_T_COLD_SHIFT 0
+#define OMAP4460_T_COLD_MASK (0x3ff << 0)
+
+/* TSHUT_THRESHOLD */
+#define OMAP4460_TSHUT_HOT_SHIFT 16
+#define OMAP4460_TSHUT_HOT_MASK (0x3ff << 16)
+#define OMAP4460_TSHUT_COLD_SHIFT 0
+#define OMAP4460_TSHUT_COLD_MASK (0x3ff << 0)
+
+/* BANDGAP_STATUS */
+#define OMAP4460_CLEAN_STOP_SHIFT 3
+#define OMAP4460_CLEAN_STOP_MASK (1 << 3)
+#define OMAP4460_BGAP_ALERT_SHIFT 2
+#define OMAP4460_BGAP_ALERT_MASK (1 << 2)
+#define OMAP4460_HOT_FLAG_SHIFT 1
+#define OMAP4460_HOT_FLAG_MASK (1 << 1)
+#define OMAP4460_COLD_FLAG_SHIFT 0
+#define OMAP4460_COLD_FLAG_MASK (1 << 0)
+
+/* TEMP_SENSOR OMAP5430 */
+#define OMAP5430_BGAP_TEMP_SENSOR_SOC_SHIFT 12
+#define OMAP5430_BGAP_TEMP_SENSOR_SOC_MASK (1 << 12)
+#define OMAP5430_BGAP_TEMPSOFF_SHIFT 11
+#define OMAP5430_BGAP_TEMPSOFF_MASK (1 << 11)
+#define OMAP5430_BGAP_TEMP_SENSOR_EOCZ_SHIFT 10
+#define OMAP5430_BGAP_TEMP_SENSOR_EOCZ_MASK (1 << 10)
+#define OMAP5430_BGAP_TEMP_SENSOR_DTEMP_SHIFT 0
+#define OMAP5430_BGAP_TEMP_SENSOR_DTEMP_MASK (0x3ff << 0)
+
+/* BANDGAP_CTRL */
+#define OMAP5430_MASK_HOT_CORE_SHIFT 5
+#define OMAP5430_MASK_HOT_CORE_MASK (1 << 5)
+#define OMAP5430_MASK_COLD_CORE_SHIFT 4
+#define OMAP5430_MASK_COLD_CORE_MASK (1 << 4)
+#define OMAP5430_MASK_HOT_MM_SHIFT 3
+#define OMAP5430_MASK_HOT_MM_MASK (1 << 3)
+#define OMAP5430_MASK_COLD_MM_SHIFT 2
+#define OMAP5430_MASK_COLD_MM_MASK (1 << 2)
+#define OMAP5430_MASK_HOT_MPU_SHIFT 1
+#define OMAP5430_MASK_HOT_MPU_MASK (1 << 1)
+#define OMAP5430_MASK_COLD_MPU_SHIFT 0
+#define OMAP5430_MASK_COLD_MPU_MASK (1 << 0)
+
+/* BANDGAP_COUNTER */
+#define OMAP5430_REPEAT_MODE_SHIFT 31
+#define OMAP5430_REPEAT_MODE_MASK (1 << 31)
+#define OMAP5430_COUNTER_SHIFT 0
+#define OMAP5430_COUNTER_MASK (0xffffff << 0)
+
+/* BANDGAP_THRESHOLD */
+#define OMAP5430_T_HOT_SHIFT 16
+#define OMAP5430_T_HOT_MASK (0x3ff << 16)
+#define OMAP5430_T_COLD_SHIFT 0
+#define OMAP5430_T_COLD_MASK (0x3ff << 0)
+
+/* TSHUT_THRESHOLD */
+#define OMAP5430_TSHUT_HOT_SHIFT 16
+#define OMAP5430_TSHUT_HOT_MASK (0x3ff << 16)
+#define OMAP5430_TSHUT_COLD_SHIFT 0
+#define OMAP5430_TSHUT_COLD_MASK (0x3ff << 0)
+
+/* BANDGAP_STATUS */
+#define OMAP5430_BGAP_ALERT_SHIFT 31
+#define OMAP5430_BGAP_ALERT_MASK (1 << 31)
+#define OMAP5430_HOT_CORE_FLAG_SHIFT 5
+#define OMAP5430_HOT_CORE_FLAG_MASK (1 << 5)
+#define OMAP5430_COLD_CORE_FLAG_SHIFT 4
+#define OMAP5430_COLD_CORE_FLAG_MASK (1 << 4)
+#define OMAP5430_HOT_MM_FLAG_SHIFT 3
+#define OMAP5430_HOT_MM_FLAG_MASK (1 << 3)
+#define OMAP5430_COLD_MM_FLAG_SHIFT 2
+#define OMAP5430_COLD_MM_FLAG_MASK (1 << 2)
+#define OMAP5430_HOT_MPU_FLAG_SHIFT 1
+#define OMAP5430_HOT_MPU_FLAG_MASK (1 << 1)
+#define OMAP5430_COLD_MPU_FLAG_SHIFT 0
+#define OMAP5430_COLD_MPU_FLAG_MASK (1 << 0)
+
+/* Offsets from the base of temperature sensor registers */
+
+/* 4430 - All goes relative to OPP_BGAP */
+#define OMAP4430_FUSE_OPP_BGAP 0x0
+#define OMAP4430_TEMP_SENSOR_CTRL_OFFSET 0xCC
+
+/* 4460 - All goes relative to OPP_BGAP */
+#define OMAP4460_FUSE_OPP_BGAP 0x0
+#define OMAP4460_TEMP_SENSOR_CTRL_OFFSET 0xCC
+#define OMAP4460_BGAP_CTRL_OFFSET 0x118
+#define OMAP4460_BGAP_COUNTER_OFFSET 0x11C
+#define OMAP4460_BGAP_THRESHOLD_OFFSET 0x120
+#define OMAP4460_BGAP_TSHUT_OFFSET 0x124
+#define OMAP4460_BGAP_STATUS_OFFSET 0x128
+
+/* 5430 - All goes relative to OPP_BGAP_GPU */
+#define OMAP5430_FUSE_OPP_BGAP_GPU 0x0
+#define OMAP5430_TEMP_SENSOR_GPU_OFFSET 0x150
+#define OMAP5430_BGAP_COUNTER_GPU_OFFSET 0x1C0
+#define OMAP5430_BGAP_THRESHOLD_GPU_OFFSET 0x1A8
+#define OMAP5430_BGAP_TSHUT_GPU_OFFSET 0x1B4
+
+#define OMAP5430_FUSE_OPP_BGAP_MPU 0x4
+#define OMAP5430_TEMP_SENSOR_MPU_OFFSET 0x14C
+#define OMAP5430_BGAP_CTRL_OFFSET 0x1A0
+#define OMAP5430_BGAP_COUNTER_MPU_OFFSET 0x1BC
+#define OMAP5430_BGAP_THRESHOLD_MPU_OFFSET 0x1A4
+#define OMAP5430_BGAP_TSHUT_MPU_OFFSET 0x1B0
+#define OMAP5430_BGAP_STATUS_OFFSET 0x1C8
+
+#define OMAP5430_FUSE_OPP_BGAP_CORE 0x8
+#define OMAP5430_TEMP_SENSOR_CORE_OFFSET 0x154
+#define OMAP5430_BGAP_COUNTER_CORE_OFFSET 0x1C4
+#define OMAP5430_BGAP_THRESHOLD_CORE_OFFSET 0x1AC
+#define OMAP5430_BGAP_TSHUT_CORE_OFFSET 0x1B8
+
+#define OMAP4460_TSHUT_HOT 900 /* 122 deg C */
+#define OMAP4460_TSHUT_COLD 895 /* 100 deg C */
+#define OMAP4460_T_HOT 800 /* 73 deg C */
+#define OMAP4460_T_COLD 795 /* 71 deg C */
+#define OMAP4460_MAX_FREQ 1500000
+#define OMAP4460_MIN_FREQ 1000000
+#define OMAP4460_MIN_TEMP -40000
+#define OMAP4460_MAX_TEMP 123000
+#define OMAP4460_HYST_VAL 5000
+#define OMAP4460_ADC_START_VALUE 530
+#define OMAP4460_ADC_END_VALUE 932
+
+#define OMAP5430_MPU_TSHUT_HOT 915
+#define OMAP5430_MPU_TSHUT_COLD 900
+#define OMAP5430_MPU_T_HOT 800
+#define OMAP5430_MPU_T_COLD 795
+#define OMAP5430_MPU_MAX_FREQ 1500000
+#define OMAP5430_MPU_MIN_FREQ 1000000
+#define OMAP5430_MPU_MIN_TEMP -40000
+#define OMAP5430_MPU_MAX_TEMP 125000
+#define OMAP5430_MPU_HYST_VAL 5000
+#define OMAP5430_ADC_START_VALUE 532
+#define OMAP5430_ADC_END_VALUE 934
+
+
+#define OMAP5430_GPU_TSHUT_HOT 915
+#define OMAP5430_GPU_TSHUT_COLD 900
+#define OMAP5430_GPU_T_HOT 800
+#define OMAP5430_GPU_T_COLD 795
+#define OMAP5430_GPU_MAX_FREQ 1500000
+#define OMAP5430_GPU_MIN_FREQ 1000000
+#define OMAP5430_GPU_MIN_TEMP -40000
+#define OMAP5430_GPU_MAX_TEMP 125000
+#define OMAP5430_GPU_HYST_VAL 5000
+
+#define OMAP5430_CORE_TSHUT_HOT 915
+#define OMAP5430_CORE_TSHUT_COLD 900
+#define OMAP5430_CORE_T_HOT 800
+#define OMAP5430_CORE_T_COLD 795
+#define OMAP5430_CORE_MAX_FREQ 1500000
+#define OMAP5430_CORE_MIN_FREQ 1000000
+#define OMAP5430_CORE_MIN_TEMP -40000
+#define OMAP5430_CORE_MAX_TEMP 125000
+#define OMAP5430_CORE_HYST_VAL 5000
+
+/**
+ * The register offsets and bit fields might change across
+ * OMAP versions hence populating them in this structure.
+ */
+
+struct temp_sensor_registers {
+ u32 temp_sensor_ctrl;
+ u32 bgap_tempsoff_mask;
+ u32 bgap_soc_mask;
+ u32 bgap_eocz_mask;
+ u32 bgap_dtemp_mask;
+
+ u32 bgap_mask_ctrl;
+ u32 mask_hot_mask;
+ u32 mask_cold_mask;
+
+ u32 bgap_mode_ctrl;
+ u32 mode_ctrl_mask;
+
+ u32 bgap_counter;
+ u32 counter_mask;
+
+ u32 bgap_threshold;
+ u32 threshold_thot_mask;
+ u32 threshold_tcold_mask;
+
+ u32 tshut_threshold;
+ u32 tshut_hot_mask;
+ u32 tshut_cold_mask;
+
+ u32 bgap_status;
+ u32 status_clean_stop_mask;
+ u32 status_bgap_alert_mask;
+ u32 status_hot_mask;
+ u32 status_cold_mask;
+
+ u32 bgap_efuse;
+};
+
+/**
+ * The thresholds and limits for temperature sensors.
+ */
+struct temp_sensor_data {
+ u32 tshut_hot;
+ u32 tshut_cold;
+ u32 t_hot;
+ u32 t_cold;
+ u32 min_freq;
+ u32 max_freq;
+ int max_temp;
+ int min_temp;
+ int hyst_val;
+ u32 adc_start_val;
+ u32 adc_end_val;
+ u32 update_int1;
+ u32 update_int2;
+};
+
+struct omap_bandgap_data;
+
+/**
+ * struct omap_bandgap - bandgap device structure
+ * @dev: device pointer
+ * @conf: platform data with sensor data
+ * @fclock: pointer to functional clock of temperature sensor
+ * @div_clk: pointer to parent clock of temperature sensor fclk
+ * @conv_table: Pointer to adc to temperature conversion table
+ * @bg_mutex: Mutex for sysfs, irq and PM
+ * @irq: MPU Irq number for thermal alert
+ * @tshut_gpio: GPIO where Tshut signal is routed
+ * @clk_rate: Holds current clock rate
+ */
+struct omap_bandgap {
+ struct device *dev;
+ void __iomem *base;
+ struct omap_bandgap_data *conf;
+ struct clk *fclock;
+ struct clk *div_clk;
+ const int *conv_table;
+ struct mutex bg_mutex; /* Mutex for irq and PM */
+ int irq;
+ int tshut_gpio;
+ u32 clk_rate;
+};
+
+/**
+ * struct temp_sensor_regval - temperature sensor register values
+ * @bg_mode_ctrl: temp sensor control register value
+ * @bg_ctrl: bandgap ctrl register value
+ * @bg_counter: bandgap counter value
+ * @bg_threshold: bandgap threshold register value
+ * @tshut_threshold: bandgap tshut register value
+ */
+struct temp_sensor_regval {
+ u32 bg_mode_ctrl;
+ u32 bg_ctrl;
+ u32 bg_counter;
+ u32 bg_threshold;
+ u32 tshut_threshold;
+};
+
+/**
+ * struct thermal_cooling_conf - description on how to cool a thermal zone
+ * @freq_clip_count: size of freq_data
+ */
+struct thermal_cooling_conf {
+ int freq_clip_count;
+};
+
+/**
+ * struct omap_temp_sensor - bandgap temperature sensor platform data
+ * @ts_data: pointer to struct with thresholds, limits of temperature sensor
+ * @registers: pointer to the list of register offsets and bitfields
+ * @regval: temperature sensor register values
+ * @domain: the name of the domain where the sensor is located
+ * @cooling_data: description on how the zone should be cooled off.
+ * @slope: sensor gradient slope info for hotspot extrapolation
+ * @const: sensor gradient const info for hotspot extrapolation
+ * @slope_pcb: sensor gradient slope info for hotspot extrapolation
+ * with no external influence
+ * @const_pcb: sensor gradient const info for hotspot extrapolation
+ * with no external influence
+ * @data: private data
+ * @register_cooling: function to describe how this sensor is going to be cooled
+ * @unregister_cooling: function to release cooling data
+ */
+struct omap_temp_sensor {
+ struct temp_sensor_data *ts_data;
+ struct temp_sensor_registers *registers;
+ struct temp_sensor_regval regval;
+ char *domain;
+ struct thermal_cooling_conf cooling_data;
+ /* for hotspot extrapolation */
+ const int slope;
+ const int constant;
+ const int slope_pcb;
+ const int constant_pcb;
+ void *data;
+ int (*register_cooling)(struct omap_bandgap *bg_ptr, int id);
+ int (*unregister_cooling)(struct omap_bandgap *bg_ptr, int id);
+};
+
+/**
+ * struct omap_bandgap_data - bandgap platform data structure
+ * @features: a bitwise flag set to describe the device features
+ * @conv_table: Pointer to adc to temperature conversion table
+ * @fclock_name: clock name of the functional clock
+ * @div_ck_nme: clock name of the clock divisor
+ * @sensor_count: count of temperature sensor device in scm
+ * @sensors: array of sensors present in this bandgap instance
+ * @expose_sensor: callback to export sensor to thermal API
+ */
+struct omap_bandgap_data {
+#define OMAP_BANDGAP_FEATURE_TSHUT (1 << 0)
+#define OMAP_BANDGAP_FEATURE_TSHUT_CONFIG (1 << 1)
+#define OMAP_BANDGAP_FEATURE_TALERT (1 << 2)
+#define OMAP_BANDGAP_FEATURE_MODE_CONFIG (1 << 3)
+#define OMAP_BANDGAP_FEATURE_COUNTER (1 << 4)
+#define OMAP_BANDGAP_FEATURE_POWER_SWITCH (1 << 5)
+#define OMAP_BANDGAP_HAS(b, f) \
+ ((b)->conf->features & OMAP_BANDGAP_FEATURE_ ## f)
+ unsigned int features;
+ const int *conv_table;
+ char *fclock_name;
+ char *div_ck_name;
+ int sensor_count;
+ int (*report_temperature)(struct omap_bandgap *bg_ptr, int id);
+ int (*expose_sensor)(struct omap_bandgap *bg_ptr, int id, char *domain);
+ int (*remove_sensor)(struct omap_bandgap *bg_ptr, int id);
+
+ /* this needs to be at the end */
+ struct omap_temp_sensor sensors[];
+};
+
+int omap_bandgap_read_thot(struct omap_bandgap *bg_ptr, int id, int *thot);
+int omap_bandgap_write_thot(struct omap_bandgap *bg_ptr, int id, int val);
+int omap_bandgap_read_tcold(struct omap_bandgap *bg_ptr, int id, int *tcold);
+int omap_bandgap_write_tcold(struct omap_bandgap *bg_ptr, int id, int val);
+int omap_bandgap_read_update_interval(struct omap_bandgap *bg_ptr, int id,
+ int *interval);
+int omap_bandgap_write_update_interval(struct omap_bandgap *bg_ptr, int id,
+ u32 interval);
+int omap_bandgap_read_temperature(struct omap_bandgap *bg_ptr, int id,
+ int *temperature);
+int omap_bandgap_set_sensor_data(struct omap_bandgap *bg_ptr, int id,
+ void *data);
+void *omap_bandgap_get_sensor_data(struct omap_bandgap *bg_ptr, int id);
+
+#endif
diff --git a/drivers/staging/omap-thermal/omap_bandgap.txt b/drivers/staging/omap-thermal/omap_bandgap.txt
new file mode 100644
index 0000000..6008a14
--- /dev/null
+++ b/drivers/staging/omap-thermal/omap_bandgap.txt
@@ -0,0 +1,30 @@
+* Texas Instrument OMAP SCM bandgap bindings
+
+In the System Control Module, OMAP supplies a voltage reference
+and a temperature sensor feature that are gathered in the band
+gap voltage and temperature sensor (VBGAPTS) module. The band
+gap provides current and voltage reference for its internal
+circuits and other analog IP blocks. The analog-to-digital
+converter (ADC) produces an output value that is proportional
+to the silicon temperature.
+
+Required properties:
+- compatible : Should be:
+ - "ti,omap4460-control-bandgap" : for OMAP4460 bandgap
+ - "ti,omap5430-control-bandgap" : for OMAP5430 bandgap
+- interrupts : this entry should indicate which interrupt line
+the talert signal is routed to;
+Specific:
+- ti,tshut-gpio : this entry should be used to inform which GPIO
+line the tshut signal is routed to;
+
+Example:
+
+bandgap {
+ reg = <0x4a002260 0x4
+ 0x4a00232C 0x4
+ 0x4a002378 0x18>;
+ compatible = "ti,omap4460-control-bandgap";
+ interrupts = <0 126 4>; /* talert */
+ ti,tshut-gpio = <86>;
+};
--
1.7.7.1.488.ge8e1c
--
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