[PATCH v4 06/12] thermal: armada: Add support for Armada AP806
Gregory CLEMENT
gregory.clement at free-electrons.com
Mon Dec 18 08:05:07 PST 2017
Hi Miquel,
On lun., déc. 18 2017, Miquel Raynal <miquel.raynal at free-electrons.com> wrote:
> From: Baruch Siach <baruch at tkos.co.il>
>
> The AP806 component is integrated in the Armada 8K and 7K lines of
> processors.
>
> The thermal sensor sample field on the status register is a signed
> value. Extend armada_get_temp() and the driver structure to handle
> signed values.
>
> Signed-off-by: Baruch Siach <baruch at tkos.co.il>
> [<miquel.raynal at free-electrons.com>: Changes when applying over the
> previous patches, including the register names changes, also switched
> the coefficients values to s64 instead of unsigned long to deal with
> negative values and used do_div instead of the traditionnal '/']
> Signed-off-by: Miquel Raynal <miquel.raynal at free-electrons.com>
I am just a little concerned by the fac that the value pass though
get_temp() is an int and now the intermediate calculation are in
s64. But maybe I'm too picky for this,
Reviewed-by: Gregory CLEMENT <gregory.clement at free-electrons.com>
Gregory
> ---
> drivers/thermal/armada_thermal.c | 80 ++++++++++++++++++++++++++++++++--------
> 1 file changed, 65 insertions(+), 15 deletions(-)
>
> diff --git a/drivers/thermal/armada_thermal.c b/drivers/thermal/armada_thermal.c
> index 198485fa77f2..ec29ea76b818 100644
> --- a/drivers/thermal/armada_thermal.c
> +++ b/drivers/thermal/armada_thermal.c
> @@ -47,6 +47,11 @@
> #define CONTROL0_OFFSET 0x0
> #define CONTROL1_OFFSET 0x4
>
> +/* TSEN refers to the temperature sensors within the AP */
> +#define CONTROL0_TSEN_START BIT(0)
> +#define CONTROL0_TSEN_RESET BIT(1)
> +#define CONTROL0_TSEN_ENABLE BIT(2)
> +
> struct armada_thermal_data;
>
> /* Marvell EBU Thermal Sensor Dev Structure */
> @@ -66,15 +71,17 @@ struct armada_thermal_data {
> bool (*is_valid)(struct armada_thermal_priv *);
>
> /* Formula coeficients: temp = (b - m * reg) / div */
> - unsigned long coef_b;
> - unsigned long coef_m;
> - unsigned long coef_div;
> + s64 coef_b;
> + s64 coef_m;
> + u32 coef_div;
> bool inverted;
> + bool signed_sample;
>
> /* Register shift and mask to access the sensor temperature */
> unsigned int temp_shift;
> unsigned int temp_mask;
> u32 is_valid_bit;
> + bool needs_control0;
> };
>
> static void armadaxp_init_sensor(struct platform_device *pdev,
> @@ -154,6 +161,18 @@ static void armada380_init_sensor(struct platform_device *pdev,
> }
> }
>
> +static void armada_ap806_init_sensor(struct platform_device *pdev,
> + struct armada_thermal_priv *priv)
> +{
> + u32 reg;
> +
> + reg = readl_relaxed(priv->control0);
> + reg &= ~CONTROL0_TSEN_RESET;
> + reg |= CONTROL0_TSEN_START | CONTROL0_TSEN_ENABLE;
> + writel(reg, priv->control0);
> + msleep(10);
> +}
> +
> static bool armada_is_valid(struct armada_thermal_priv *priv)
> {
> u32 reg = readl_relaxed(priv->status);
> @@ -165,8 +184,8 @@ static int armada_get_temp(struct thermal_zone_device *thermal,
> int *temp)
> {
> struct armada_thermal_priv *priv = thermal->devdata;
> - unsigned long reg;
> - unsigned long m, b, div;
> + u32 reg, div;
> + s64 sample, b, m;
>
> /* Valid check */
> if (priv->data->is_valid && !priv->data->is_valid(priv)) {
> @@ -177,6 +196,11 @@ static int armada_get_temp(struct thermal_zone_device *thermal,
>
> reg = readl_relaxed(priv->status);
> reg = (reg >> priv->data->temp_shift) & priv->data->temp_mask;
> + if (priv->data->signed_sample)
> + /* The most significant bit is the sign bit */
> + sample = sign_extend32(reg, fls(priv->data->temp_mask) - 1);
> + else
> + sample = reg;
>
> /* Get formula coeficients */
> b = priv->data->coef_b;
> @@ -184,9 +208,12 @@ static int armada_get_temp(struct thermal_zone_device *thermal,
> div = priv->data->coef_div;
>
> if (priv->data->inverted)
> - *temp = ((m * reg) - b) / div;
> + *temp = (m * sample) - b;
> else
> - *temp = (b - (m * reg)) / div;
> + *temp = b - (m * sample);
> +
> + do_div(*temp, div);
> +
> return 0;
> }
>
> @@ -198,8 +225,8 @@ static const struct armada_thermal_data armadaxp_data = {
> .init_sensor = armadaxp_init_sensor,
> .temp_shift = 10,
> .temp_mask = 0x1ff,
> - .coef_b = 3153000000UL,
> - .coef_m = 10000000UL,
> + .coef_b = 3153000000ULL,
> + .coef_m = 10000000ULL,
> .coef_div = 13825,
> };
>
> @@ -209,8 +236,8 @@ static const struct armada_thermal_data armada370_data = {
> .is_valid_bit = BIT(9),
> .temp_shift = 10,
> .temp_mask = 0x1ff,
> - .coef_b = 3153000000UL,
> - .coef_m = 10000000UL,
> + .coef_b = 3153000000ULL,
> + .coef_m = 10000000ULL,
> .coef_div = 13825,
> };
>
> @@ -220,8 +247,8 @@ static const struct armada_thermal_data armada375_data = {
> .is_valid_bit = BIT(10),
> .temp_shift = 0,
> .temp_mask = 0x1ff,
> - .coef_b = 3171900000UL,
> - .coef_m = 10000000UL,
> + .coef_b = 3171900000ULL,
> + .coef_m = 10000000ULL,
> .coef_div = 13616,
> };
>
> @@ -231,12 +258,26 @@ static const struct armada_thermal_data armada380_data = {
> .is_valid_bit = BIT(10),
> .temp_shift = 0,
> .temp_mask = 0x3ff,
> - .coef_b = 1172499100UL,
> - .coef_m = 2000096UL,
> + .coef_b = 1172499100ULL,
> + .coef_m = 2000096ULL,
> .coef_div = 4201,
> .inverted = true,
> };
>
> +static const struct armada_thermal_data armada_ap806_data = {
> + .is_valid = armada_is_valid,
> + .init_sensor = armada_ap806_init_sensor,
> + .is_valid_bit = BIT(16),
> + .temp_shift = 0,
> + .temp_mask = 0x3ff,
> + .coef_b = -150000LL,
> + .coef_m = 423ULL,
> + .coef_div = 1,
> + .inverted = true,
> + .signed_sample = true,
> + .needs_control0 = true,
> +};
> +
> static const struct of_device_id armada_thermal_id_table[] = {
> {
> .compatible = "marvell,armadaxp-thermal",
> @@ -255,6 +296,10 @@ static const struct of_device_id armada_thermal_id_table[] = {
> .data = &armada380_data,
> },
> {
> + .compatible = "marvell,armada-ap806-thermal",
> + .data = &armada_ap806_data,
> + },
> + {
> /* sentinel */
> },
> };
> @@ -296,6 +341,11 @@ static int armada_thermal_probe(struct platform_device *pdev)
> */
> if (resource_size(res) == LEGACY_CONTROL_MEM_LEN) {
> /* ->control0 unavailable in this configuration */
> + if (priv->data->needs_control0) {
> + dev_err(&pdev->dev, "No access to control0 register\n");
> + return -EINVAL;
> + }
> +
> priv->control1 = control + LEGACY_CONTROL1_OFFSET;
> } else {
> priv->control0 = control + CONTROL0_OFFSET;
> --
> 2.11.0
>
--
Gregory Clement, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com
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