diff options
Diffstat (limited to 'drivers/thermal/armada_thermal.c')
| -rw-r--r-- | drivers/thermal/armada_thermal.c | 158 |
1 files changed, 139 insertions, 19 deletions
diff --git a/drivers/thermal/armada_thermal.c b/drivers/thermal/armada_thermal.c index 5e53212b984..9d1420acb39 100644 --- a/drivers/thermal/armada_thermal.c +++ b/drivers/thermal/armada_thermal.c @@ -24,10 +24,7 @@ #include <linux/of_device.h> #include <linux/thermal.h> -#define THERMAL_VALID_OFFSET 9 #define THERMAL_VALID_MASK 0x1 -#define THERMAL_TEMP_OFFSET 10 -#define THERMAL_TEMP_MASK 0x1ff /* Thermal Manager Control and Status Register */ #define PMU_TDC0_SW_RST_MASK (0x1 << 1) @@ -38,24 +35,47 @@ #define PMU_TDC0_OTF_CAL_MASK (0x1 << 30) #define PMU_TDC0_START_CAL_MASK (0x1 << 25) -struct armada_thermal_ops; +#define A375_Z1_CAL_RESET_LSB 0x8011e214 +#define A375_Z1_CAL_RESET_MSB 0x30a88019 +#define A375_Z1_WORKAROUND_BIT BIT(9) + +#define A375_UNIT_CONTROL_SHIFT 27 +#define A375_UNIT_CONTROL_MASK 0x7 +#define A375_READOUT_INVERT BIT(15) +#define A375_HW_RESETn BIT(8) +#define A380_HW_RESET BIT(8) + +struct armada_thermal_data; /* Marvell EBU Thermal Sensor Dev Structure */ struct armada_thermal_priv { void __iomem *sensor; void __iomem *control; - struct armada_thermal_ops *ops; + struct armada_thermal_data *data; }; -struct armada_thermal_ops { +struct armada_thermal_data { /* Initialize the sensor */ - void (*init_sensor)(struct armada_thermal_priv *); + void (*init_sensor)(struct platform_device *pdev, + struct armada_thermal_priv *); /* Test for a valid sensor value (optional) */ 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; + bool inverted; + + /* Register shift and mask to access the sensor temperature */ + unsigned int temp_shift; + unsigned int temp_mask; + unsigned int is_valid_shift; }; -static void armadaxp_init_sensor(struct armada_thermal_priv *priv) +static void armadaxp_init_sensor(struct platform_device *pdev, + struct armada_thermal_priv *priv) { unsigned long reg; @@ -80,7 +100,8 @@ static void armadaxp_init_sensor(struct armada_thermal_priv *priv) writel(reg, priv->sensor); } -static void armada370_init_sensor(struct armada_thermal_priv *priv) +static void armada370_init_sensor(struct platform_device *pdev, + struct armada_thermal_priv *priv) { unsigned long reg; @@ -99,11 +120,54 @@ static void armada370_init_sensor(struct armada_thermal_priv *priv) mdelay(10); } +static void armada375_init_sensor(struct platform_device *pdev, + struct armada_thermal_priv *priv) +{ + unsigned long reg; + bool quirk_needed = + !!of_device_is_compatible(pdev->dev.of_node, + "marvell,armada375-z1-thermal"); + + if (quirk_needed) { + /* Ensure these registers have the default (reset) values */ + writel(A375_Z1_CAL_RESET_LSB, priv->control); + writel(A375_Z1_CAL_RESET_MSB, priv->control + 0x4); + } + + reg = readl(priv->control + 4); + reg &= ~(A375_UNIT_CONTROL_MASK << A375_UNIT_CONTROL_SHIFT); + reg &= ~A375_READOUT_INVERT; + reg &= ~A375_HW_RESETn; + + if (quirk_needed) + reg |= A375_Z1_WORKAROUND_BIT; + + writel(reg, priv->control + 4); + mdelay(20); + + reg |= A375_HW_RESETn; + writel(reg, priv->control + 4); + mdelay(50); +} + +static void armada380_init_sensor(struct platform_device *pdev, + struct armada_thermal_priv *priv) +{ + unsigned long reg = readl_relaxed(priv->control); + + /* Reset hardware once */ + if (!(reg & A380_HW_RESET)) { + reg |= A380_HW_RESET; + writel(reg, priv->control); + mdelay(10); + } +} + static bool armada_is_valid(struct armada_thermal_priv *priv) { unsigned long reg = readl_relaxed(priv->sensor); - return (reg >> THERMAL_VALID_OFFSET) & THERMAL_VALID_MASK; + return (reg >> priv->data->is_valid_shift) & THERMAL_VALID_MASK; } static int armada_get_temp(struct thermal_zone_device *thermal, @@ -111,17 +175,27 @@ static int armada_get_temp(struct thermal_zone_device *thermal, { struct armada_thermal_priv *priv = thermal->devdata; unsigned long reg; + unsigned long m, b, div; /* Valid check */ - if (priv->ops->is_valid && !priv->ops->is_valid(priv)) { + if (priv->data->is_valid && !priv->data->is_valid(priv)) { dev_err(&thermal->device, "Temperature sensor reading not valid\n"); return -EIO; } reg = readl_relaxed(priv->sensor); - reg = (reg >> THERMAL_TEMP_OFFSET) & THERMAL_TEMP_MASK; - *temp = (3153000000UL - (10000000UL*reg)) / 13825; + reg = (reg >> priv->data->temp_shift) & priv->data->temp_mask; + + /* Get formula coeficients */ + b = priv->data->coef_b; + m = priv->data->coef_m; + div = priv->data->coef_div; + + if (priv->data->inverted) + *temp = ((m * reg) - b) / div; + else + *temp = (b - (m * reg)) / div; return 0; } @@ -129,23 +203,69 @@ static struct thermal_zone_device_ops ops = { .get_temp = armada_get_temp, }; -static const struct armada_thermal_ops armadaxp_ops = { +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_div = 13825, }; -static const struct armada_thermal_ops armada370_ops = { +static const struct armada_thermal_data armada370_data = { .is_valid = armada_is_valid, .init_sensor = armada370_init_sensor, + .is_valid_shift = 9, + .temp_shift = 10, + .temp_mask = 0x1ff, + .coef_b = 3153000000UL, + .coef_m = 10000000UL, + .coef_div = 13825, +}; + +static const struct armada_thermal_data armada375_data = { + .is_valid = armada_is_valid, + .init_sensor = armada375_init_sensor, + .is_valid_shift = 10, + .temp_shift = 0, + .temp_mask = 0x1ff, + .coef_b = 3171900000UL, + .coef_m = 10000000UL, + .coef_div = 13616, +}; + +static const struct armada_thermal_data armada380_data = { + .is_valid = armada_is_valid, + .init_sensor = armada380_init_sensor, + .is_valid_shift = 10, + .temp_shift = 0, + .temp_mask = 0x3ff, + .coef_b = 1169498786UL, + .coef_m = 2000000UL, + .coef_div = 4289, + .inverted = true, }; static const struct of_device_id armada_thermal_id_table[] = { { .compatible = "marvell,armadaxp-thermal", - .data = &armadaxp_ops, + .data = &armadaxp_data, }, { .compatible = "marvell,armada370-thermal", - .data = &armada370_ops, + .data = &armada370_data, + }, + { + .compatible = "marvell,armada375-thermal", + .data = &armada375_data, + }, + { + .compatible = "marvell,armada375-z1-thermal", + .data = &armada375_data, + }, + { + .compatible = "marvell,armada380-thermal", + .data = &armada380_data, }, { /* sentinel */ @@ -178,8 +298,8 @@ static int armada_thermal_probe(struct platform_device *pdev) if (IS_ERR(priv->control)) return PTR_ERR(priv->control); - priv->ops = (struct armada_thermal_ops *)match->data; - priv->ops->init_sensor(priv); + priv->data = (struct armada_thermal_data *)match->data; + priv->data->init_sensor(pdev, priv); thermal = thermal_zone_device_register("armada_thermal", 0, 0, priv, &ops, NULL, 0, 0); |