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-rw-r--r--drivers/staging/Kconfig2
-rw-r--r--drivers/staging/Makefile1
-rw-r--r--drivers/staging/omap-thermal/Kconfig11
-rw-r--r--drivers/staging/omap-thermal/Makefile2
-rw-r--r--drivers/staging/omap-thermal/TODO28
-rw-r--r--drivers/staging/omap-thermal/omap-bandgap.c1167
-rw-r--r--drivers/staging/omap-thermal/omap-bandgap.h425
-rw-r--r--drivers/staging/omap-thermal/omap_bandgap.txt30
8 files changed, 1666 insertions, 0 deletions
diff --git a/drivers/staging/Kconfig b/drivers/staging/Kconfig
index d3934d79524a..e3402d5644dd 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 5b2219ac5207..3be59d02cae4 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-$(CONFIG_OMAP_BANDGAP) += omap-thermal/
diff --git a/drivers/staging/omap-thermal/Kconfig b/drivers/staging/omap-thermal/Kconfig
new file mode 100644
index 000000000000..8c9979dfaa69
--- /dev/null
+++ b/drivers/staging/omap-thermal/Kconfig
@@ -0,0 +1,11 @@
+config OMAP_BANDGAP
+ tristate "Texas Instruments OMAP4+ temperature sensor driver"
+ depends on THERMAL
+ depends on ARCH_OMAP4 || SOC_OMAP5
+ help
+ If you say yes here you get support for the Texas Instruments
+ OMAP4460+ on die bandgap temperature sensor support. The register
+ set is part of system control module.
+
+ This includes alert interrupts generation and also the TSHUT
+ support.
diff --git a/drivers/staging/omap-thermal/Makefile b/drivers/staging/omap-thermal/Makefile
new file mode 100644
index 000000000000..c92a854e65f1
--- /dev/null
+++ b/drivers/staging/omap-thermal/Makefile
@@ -0,0 +1,2 @@
+obj-$(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 000000000000..9e23cc4d551b
--- /dev/null
+++ b/drivers/staging/omap-thermal/TODO
@@ -0,0 +1,28 @@
+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:
+- write Kconfig dependencies so that omap variants are covered
+- 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@ti.com>
diff --git a/drivers/staging/omap-thermal/omap-bandgap.c b/drivers/staging/omap-thermal/omap-bandgap.c
new file mode 100644
index 000000000000..8ea626406a34
--- /dev/null
+++ b/drivers/staging/omap-thermal/omap-bandgap.c
@@ -0,0 +1,1167 @@
+/*
+ * OMAP4 Bandgap temperature sensor driver
+ *
+ * Copyright (C) 2011-2012 Texas Instruments Incorporated - http://www.ti.com/
+ * Author: J Keerthy <j-keerthy@ti.com>
+ * Author: Moiz Sonasath <m-sonasath@ti.com>
+ * Couple of fixes, DT and MFD adaptation:
+ * Eduardo Valentin <eduardo.valentin@ti.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_device.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 = 0;
+
+ 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 000000000000..8b9883d0e1ed
--- /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@ti.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 000000000000..6008a1452fde
--- /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>;
+};
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-19 22:21:32 +0000