On Fri, Oct 09, 2015 at 03:11:06PM +0530, Rajendra Nayak wrote:
> 8960 family of SoCs have the TSENS device as part of GCC, hence
> the driver probes the virtual child device created by GCC and
> uses the parent to extract all DT properties and reuses the GCC
> regmap.
>
> Also GCC/TSENS are part of a domain thats not always ON.
> Hence add .suspend and .resume hooks to save and restore some of
> the inited register context.
>
> Also 8960 family have some of the TSENS init sequence thats
> required to be done by the HLOS driver (some later versions of TSENS
> do not export these registers to non-secure world, and hence need
> these initializations to be done by secure bootloaders)
>
> 8660 from the same family has just one sensor and hence some register
> offset/layout differences which need special handling in the driver.
>
> Based on the original code from Siddartha Mohanadoss, Stephen Boyd and
> Narendran Rajan.
>
> Signed-off-by: Rajendra Nayak <[email protected]>
> ---
> drivers/thermal/qcom/Makefile | 2 +-
> drivers/thermal/qcom/tsens-8960.c | 291
> ++++++++++++++++++++++++++++++++++++++
> drivers/thermal/qcom/tsens.c | 13 +-
> drivers/thermal/qcom/tsens.h | 2 +-
> 4 files changed, 302 insertions(+), 6 deletions(-)
> create mode 100644 drivers/thermal/qcom/tsens-8960.c
>
> diff --git a/drivers/thermal/qcom/Makefile b/drivers/thermal/qcom/Makefile
> index a471100..f3cefd1 100644
> --- a/drivers/thermal/qcom/Makefile
> +++ b/drivers/thermal/qcom/Makefile
> @@ -1,2 +1,2 @@
> obj-$(CONFIG_QCOM_TSENS) += qcom_tsens.o
> -qcom_tsens-y += tsens.o tsens-common.o tsens-8916.o
> tsens-8974.o
> +qcom_tsens-y += tsens.o tsens-common.o tsens-8916.o
> tsens-8974.o tsens-8960.o
> diff --git a/drivers/thermal/qcom/tsens-8960.c
> b/drivers/thermal/qcom/tsens-8960.c
> new file mode 100644
> index 0000000..00f45e7
> --- /dev/null
> +++ b/drivers/thermal/qcom/tsens-8960.c
> @@ -0,0 +1,291 @@
> +/*
> + * Copyright (c) 2015, The Linux Foundation. All rights reserved.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 and
> + * only 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.
> + *
> + */
> +
> +#include <linux/platform_device.h>
> +#include <linux/delay.h>
> +#include <linux/bitops.h>
> +#include <linux/regmap.h>
> +#include "tsens.h"
> +
> +#define CAL_MDEGC 30000
> +
> +#define CONFIG_ADDR 0x3640
> +#define CONFIG_ADDR_8660 0x3620
> +/* CONFIG_ADDR bitmasks */
> +#define CONFIG 0x9b
> +#define CONFIG_MASK 0xf
> +#define CONFIG_8660 1
> +#define CONFIG_SHIFT_8660 28
> +#define CONFIG_MASK_8660 (3 << CONFIG_SHIFT_8660)
> +
> +#define STATUS_CNTL_ADDR_8064 0x3660
> +#define CNTL_ADDR 0x3620
> +/* CNTL_ADDR bitmasks */
> +#define EN BIT(0)
> +#define SW_RST BIT(1)
> +#define SENSOR0_EN BIT(3)
> +#define SLP_CLK_ENA BIT(26)
> +#define SLP_CLK_ENA_8660 BIT(24)
> +#define MEASURE_PERIOD 1
> +#define SENSOR0_SHIFT 3
> +
> +/* INT_STATUS_ADDR bitmasks */
> +#define MIN_STATUS_MASK BIT(0)
> +#define LOWER_STATUS_CLR BIT(1)
> +#define UPPER_STATUS_CLR BIT(2)
> +#define MAX_STATUS_MASK BIT(3)
> +
> +#define THRESHOLD_ADDR 0x3624
> +/* THRESHOLD_ADDR bitmasks */
> +#define THRESHOLD_MAX_LIMIT_SHIFT 24
> +#define THRESHOLD_MIN_LIMIT_SHIFT 16
> +#define THRESHOLD_UPPER_LIMIT_SHIFT 8
> +#define THRESHOLD_LOWER_LIMIT_SHIFT 0
> +
> +/* Initial temperature threshold values */
> +#define LOWER_LIMIT_TH 0x50
> +#define UPPER_LIMIT_TH 0xdf
> +#define MIN_LIMIT_TH 0x0
> +#define MAX_LIMIT_TH 0xff
> +
> +#define S0_STATUS_ADDR 0x3628
> +#define INT_STATUS_ADDR 0x363c
> +#define TRDY_MASK BIT(7)
> +
> +static int suspend_8960(struct tsens_device *tmdev)
> +{
> + int ret;
> + unsigned int mask;
> + struct regmap *map = tmdev->map;
> +
> + ret = regmap_read(map, THRESHOLD_ADDR, &tmdev->ctx.threshold);
> + if (ret)
> + return ret;
> +
> + ret = regmap_read(map, CNTL_ADDR, &tmdev->ctx.control);
> + if (ret)
> + return ret;
> +
> + if (tmdev->num_sensors > 1)
> + mask = SLP_CLK_ENA | EN;
> + else
> + mask = SLP_CLK_ENA_8660 | EN;
> +
> + ret = regmap_update_bits(map, CNTL_ADDR, mask, 0);
> + if (ret)
> + return ret;
> +
> + tmdev->trdy = false;
> +
> + return 0;
> +}
> +
> +static int resume_8960(struct tsens_device *tmdev)
> +{
> + int ret;
> + unsigned long reg_cntl;
> + struct regmap *map = tmdev->map;
> +
> + ret = regmap_update_bits(map, CNTL_ADDR, SW_RST, SW_RST);
> + if (ret)
> + return ret;
> +
> + /*
> + * Separate CONFIG restore is not needed only for 8660 as
> + * config is part of CTRL Addr and its restored as such
> + */
> + if (tmdev->num_sensors > 1) {
> + ret = regmap_update_bits(map, CONFIG_ADDR, CONFIG_MASK, CONFIG);
> + if (ret)
> + return ret;
> + }
> +
> + ret = regmap_write(map, THRESHOLD_ADDR, tmdev->ctx.threshold);
> + if (ret)
> + return ret;
> +
> + ret = regmap_write(map, CNTL_ADDR, tmdev->ctx.control);
> + if (ret)
> + return ret;
> +
> + reg_cntl = tmdev->ctx.control;
> + reg_cntl >>= SENSOR0_SHIFT;
What the above two lines are doing? are they no-ops?
> +
> + return 0;
> +}
> +
> +static int enable_8960(struct tsens_device *tmdev, int id)
> +{
> + int ret;
> + u32 reg, mask;
> +
> + ret = regmap_read(tmdev->map, CNTL_ADDR, ®);
> + if (ret)
> + return ret;
> +
> + mask = BIT(id + SENSOR0_SHIFT);
> + ret = regmap_write(tmdev->map, CNTL_ADDR, reg | SW_RST);
> + if (ret)
> + return ret;
> +
> + if (tmdev->num_sensors > 1)
> + reg |= mask | SLP_CLK_ENA | EN;
> + else
> + reg |= mask | SLP_CLK_ENA_8660 | EN;
> +
> + tmdev->trdy = false;
> + ret = regmap_write(tmdev->map, CNTL_ADDR, reg);
> + if (ret)
> + return ret;
> +
> + return 0;
> +}
> +
> +static void disable_8960(struct tsens_device *tmdev)
> +{
> + int ret;
> + u32 reg_cntl;
> + u32 mask;
> +
> + mask = GENMASK(tmdev->num_sensors - 1, 0);
> + mask <<= SENSOR0_SHIFT;
> + mask |= EN;
> +
> + ret = regmap_read(tmdev->map, CNTL_ADDR, ®_cntl);
> + if (ret)
> + return;
> +
> + reg_cntl &= ~mask;
> +
> + if (tmdev->num_sensors > 1)
> + reg_cntl &= ~SLP_CLK_ENA;
> + else
> + reg_cntl &= ~SLP_CLK_ENA_8660;
> +
> + regmap_write(tmdev->map, CNTL_ADDR, reg_cntl);
> +}
> +
> +static int init_8960(struct tsens_device *tmdev)
> +{
> + int ret, i;
> + u32 reg_cntl;
> +
> + tmdev->map = dev_get_regmap(tmdev->dev, NULL);
> + if (!tmdev->map)
> + return -ENODEV;
> +
> + /*
> + * The status registers for each sensor are discontiguous
> + * because some SoCs have 5 sensors while others have more
> + * but the control registers stay in the same place, i.e
> + * directly after the first 5 status registers.
> + */
> + for (i = 0; i < tmdev->num_sensors; i++) {
> + if (i >= 5)
> + tmdev->sensor[i].status = S0_STATUS_ADDR + 40;
> + tmdev->sensor[i].status += i * 4;
> + }
> +
> + reg_cntl = SW_RST;
> + ret = regmap_update_bits(tmdev->map, CNTL_ADDR, SW_RST, reg_cntl);
> + if (ret)
> + return ret;
> +
> + if (tmdev->num_sensors > 1) {
> + reg_cntl |= SLP_CLK_ENA | (MEASURE_PERIOD << 18);
> + reg_cntl &= ~SW_RST;
> + ret = regmap_update_bits(tmdev->map, CONFIG_ADDR,
> + CONFIG_MASK, CONFIG);
> + } else {
> + reg_cntl |= SLP_CLK_ENA_8660 | (MEASURE_PERIOD << 16);
> + reg_cntl &= ~CONFIG_MASK_8660;
> + reg_cntl |= CONFIG_8660 << CONFIG_SHIFT_8660;
> + }
> +
> + reg_cntl |= GENMASK(tmdev->num_sensors - 1, 0) << SENSOR0_SHIFT;
> + ret = regmap_write(tmdev->map, CNTL_ADDR, reg_cntl);
> + if (ret)
> + return ret;
> +
> + reg_cntl |= EN;
> + ret = regmap_write(tmdev->map, CNTL_ADDR, reg_cntl);
> + if (ret)
> + return ret;
> +
> + return 0;
> +}
> +
> +static int calibrate_8960(struct tsens_device *tmdev)
> +{
> + int i;
> + char *data;
> +
> + ssize_t num_read = tmdev->num_sensors;
> + struct tsens_sensor *s = tmdev->sensor;
> +
> + data = qfprom_read(tmdev->dev, "calib");
> + if (IS_ERR(data))
> + data = qfprom_read(tmdev->dev, "calib_backup");
> + if (IS_ERR(data))
> + return PTR_ERR(data);
Oh.. so calibration can fail on prom reads...
> +
> + for (i = 0; i < num_read; i++, s++)
> + s->offset = CAL_MDEGC - s->slope * data[i];
> +
> + return 0;
> +}
> +
> +/* Temperature on y axis and ADC-code on x-axis */
> +static inline int code_to_mdegC(u32 adc_code, const struct tsens_sensor *s)
> +{
> + return adc_code * s->slope + s->offset;
> +}
> +
> +static int get_temp_8960(struct tsens_device *tmdev, int id, int *temp)
> +{
> + int ret;
> + u32 code, trdy;
> + const struct tsens_sensor *s = &tmdev->sensor[id];
> +
> + if (!tmdev->trdy) {
> + ret = regmap_read(tmdev->map, INT_STATUS_ADDR, &trdy);
> + if (ret)
> + return ret;
> + while (!(trdy & TRDY_MASK)) {
> + usleep_range(1000, 1100);
> + regmap_read(tmdev->map, INT_STATUS_ADDR, &trdy);
Is there a maximum amount of tries?
Would that be any case in which this would be stuck busy
looping ?
> + }
> + tmdev->trdy = true;
> + }
> +
> + ret = regmap_read(tmdev->map, s->status, &code);
> + if (ret)
> + return ret;
> +
> + *temp = code_to_mdegC(code, s);
> +
> + dev_dbg(tmdev->dev, "Sensor%d temp is: %d", id, *temp);
I suppose the thermal tracing could be probably better than a dev_dbg?
> +
> + return 0;
> +}
> +
> +const struct tsens_ops ops_8960 = {
> + .init = init_8960,
> + .calibrate = calibrate_8960,
> + .get_temp = get_temp_8960,
> + .enable = enable_8960,
> + .disable = disable_8960,
> + .suspend = suspend_8960,
> + .resume = resume_8960,
> +};
> diff --git a/drivers/thermal/qcom/tsens.c b/drivers/thermal/qcom/tsens.c
> index 06ed0c6..d640e8f 100644
> --- a/drivers/thermal/qcom/tsens.c
> +++ b/drivers/thermal/qcom/tsens.c
> @@ -119,7 +119,11 @@ static int tsens_probe(struct platform_device *pdev)
> struct tsens_device *tmdev;
> const struct of_device_id *id;
>
> - dev = &pdev->dev;
> + if (pdev->dev.of_node)
> + dev = &pdev->dev;
> + else
> + dev = pdev->dev.parent;
> +
Should this be part of the patch that adds tsens.c?
> np = dev->of_node;
>
> num = of_property_count_u32_elems(np, "qcom,tsens-slopes");
> @@ -141,10 +145,11 @@ static int tsens_probe(struct platform_device *pdev)
> &s->slope);
>
> id = of_match_node(tsens_table, np);
> - if (!id)
> - return -ENODEV;
> + if (id)
> + tmdev->ops = id->data;
> + else
> + tmdev->ops = &ops_8960;
>
> - tmdev->ops = id->data;
> if (!tmdev->ops || !tmdev->ops->init || !tmdev->ops->calibrate ||
> !tmdev->ops->get_temp)
> return -EINVAL;
> diff --git a/drivers/thermal/qcom/tsens.h b/drivers/thermal/qcom/tsens.h
> index 00183db..10e2e84 100644
> --- a/drivers/thermal/qcom/tsens.h
> +++ b/drivers/thermal/qcom/tsens.h
> @@ -64,6 +64,6 @@ void compute_intercept_slope(struct tsens_device *, u32 *,
> u32 *, u32);
> int init_common(struct tsens_device *);
> int get_temp_common(struct tsens_device *, int, int *);
>
> -extern const struct tsens_ops ops_8916, ops_8974;
> +extern const struct tsens_ops ops_8960, ops_8916, ops_8974;
>
> #endif /* __QCOM_TSENS_H__ */
> --
> QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member
> of Code Aurora Forum, hosted by The Linux Foundation
>
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