342 lines
8.4 KiB
C
342 lines
8.4 KiB
C
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/*
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* Marvell Armada 370/XP thermal sensor driver
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*
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* Copyright (C) 2013 Marvell
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/io.h>
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#include <linux/kernel.h>
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#include <linux/of.h>
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#include <linux/module.h>
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#include <linux/delay.h>
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#include <linux/platform_device.h>
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#include <linux/of_device.h>
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#include <linux/thermal.h>
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#define THERMAL_VALID_MASK 0x1
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/* Thermal Manager Control and Status Register */
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#define PMU_TDC0_SW_RST_MASK (0x1 << 1)
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#define PMU_TM_DISABLE_OFFS 0
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#define PMU_TM_DISABLE_MASK (0x1 << PMU_TM_DISABLE_OFFS)
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#define PMU_TDC0_REF_CAL_CNT_OFFS 11
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#define PMU_TDC0_REF_CAL_CNT_MASK (0x1ff << PMU_TDC0_REF_CAL_CNT_OFFS)
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#define PMU_TDC0_OTF_CAL_MASK (0x1 << 30)
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#define PMU_TDC0_START_CAL_MASK (0x1 << 25)
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#define A375_Z1_CAL_RESET_LSB 0x8011e214
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#define A375_Z1_CAL_RESET_MSB 0x30a88019
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#define A375_Z1_WORKAROUND_BIT BIT(9)
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#define A375_UNIT_CONTROL_SHIFT 27
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#define A375_UNIT_CONTROL_MASK 0x7
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#define A375_READOUT_INVERT BIT(15)
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#define A375_HW_RESETn BIT(8)
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#define A380_HW_RESET BIT(8)
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struct armada_thermal_data;
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/* Marvell EBU Thermal Sensor Dev Structure */
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struct armada_thermal_priv {
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void __iomem *sensor;
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void __iomem *control;
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struct armada_thermal_data *data;
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};
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struct armada_thermal_data {
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/* Initialize the sensor */
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void (*init_sensor)(struct platform_device *pdev,
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struct armada_thermal_priv *);
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/* Test for a valid sensor value (optional) */
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bool (*is_valid)(struct armada_thermal_priv *);
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/* Formula coeficients: temp = (b + m * reg) / div */
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unsigned long coef_b;
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unsigned long coef_m;
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unsigned long coef_div;
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bool inverted;
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/* Register shift and mask to access the sensor temperature */
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unsigned int temp_shift;
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unsigned int temp_mask;
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unsigned int is_valid_shift;
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};
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static void armadaxp_init_sensor(struct platform_device *pdev,
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struct armada_thermal_priv *priv)
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{
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unsigned long reg;
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reg = readl_relaxed(priv->control);
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reg |= PMU_TDC0_OTF_CAL_MASK;
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writel(reg, priv->control);
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/* Reference calibration value */
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reg &= ~PMU_TDC0_REF_CAL_CNT_MASK;
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reg |= (0xf1 << PMU_TDC0_REF_CAL_CNT_OFFS);
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writel(reg, priv->control);
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/* Reset the sensor */
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reg = readl_relaxed(priv->control);
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writel((reg | PMU_TDC0_SW_RST_MASK), priv->control);
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writel(reg, priv->control);
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/* Enable the sensor */
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reg = readl_relaxed(priv->sensor);
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reg &= ~PMU_TM_DISABLE_MASK;
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writel(reg, priv->sensor);
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}
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static void armada370_init_sensor(struct platform_device *pdev,
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struct armada_thermal_priv *priv)
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{
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unsigned long reg;
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reg = readl_relaxed(priv->control);
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reg |= PMU_TDC0_OTF_CAL_MASK;
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writel(reg, priv->control);
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/* Reference calibration value */
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reg &= ~PMU_TDC0_REF_CAL_CNT_MASK;
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reg |= (0xf1 << PMU_TDC0_REF_CAL_CNT_OFFS);
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writel(reg, priv->control);
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reg &= ~PMU_TDC0_START_CAL_MASK;
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writel(reg, priv->control);
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mdelay(10);
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}
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static void armada375_init_sensor(struct platform_device *pdev,
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struct armada_thermal_priv *priv)
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{
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unsigned long reg;
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bool quirk_needed =
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!!of_device_is_compatible(pdev->dev.of_node,
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"marvell,armada375-z1-thermal");
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if (quirk_needed) {
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/* Ensure these registers have the default (reset) values */
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writel(A375_Z1_CAL_RESET_LSB, priv->control);
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writel(A375_Z1_CAL_RESET_MSB, priv->control + 0x4);
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}
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reg = readl(priv->control + 4);
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reg &= ~(A375_UNIT_CONTROL_MASK << A375_UNIT_CONTROL_SHIFT);
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reg &= ~A375_READOUT_INVERT;
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reg &= ~A375_HW_RESETn;
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if (quirk_needed)
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reg |= A375_Z1_WORKAROUND_BIT;
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writel(reg, priv->control + 4);
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mdelay(20);
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reg |= A375_HW_RESETn;
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writel(reg, priv->control + 4);
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mdelay(50);
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}
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static void armada380_init_sensor(struct platform_device *pdev,
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struct armada_thermal_priv *priv)
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{
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unsigned long reg = readl_relaxed(priv->control);
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/* Reset hardware once */
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if (!(reg & A380_HW_RESET)) {
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reg |= A380_HW_RESET;
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writel(reg, priv->control);
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mdelay(10);
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}
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}
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static bool armada_is_valid(struct armada_thermal_priv *priv)
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{
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unsigned long reg = readl_relaxed(priv->sensor);
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return (reg >> priv->data->is_valid_shift) & THERMAL_VALID_MASK;
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}
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static int armada_get_temp(struct thermal_zone_device *thermal,
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unsigned long *temp)
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{
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struct armada_thermal_priv *priv = thermal->devdata;
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unsigned long reg;
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unsigned long m, b, div;
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/* Valid check */
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if (priv->data->is_valid && !priv->data->is_valid(priv)) {
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dev_err(&thermal->device,
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"Temperature sensor reading not valid\n");
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return -EIO;
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}
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reg = readl_relaxed(priv->sensor);
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reg = (reg >> priv->data->temp_shift) & priv->data->temp_mask;
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/* Get formula coeficients */
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b = priv->data->coef_b;
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m = priv->data->coef_m;
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div = priv->data->coef_div;
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if (priv->data->inverted)
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*temp = ((m * reg) - b) / div;
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else
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*temp = (b - (m * reg)) / div;
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return 0;
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}
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static struct thermal_zone_device_ops ops = {
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.get_temp = armada_get_temp,
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};
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static const struct armada_thermal_data armadaxp_data = {
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.init_sensor = armadaxp_init_sensor,
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.temp_shift = 10,
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.temp_mask = 0x1ff,
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.coef_b = 3153000000UL,
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.coef_m = 10000000UL,
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.coef_div = 13825,
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};
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static const struct armada_thermal_data armada370_data = {
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.is_valid = armada_is_valid,
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.init_sensor = armada370_init_sensor,
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.is_valid_shift = 9,
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.temp_shift = 10,
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.temp_mask = 0x1ff,
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.coef_b = 3153000000UL,
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.coef_m = 10000000UL,
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.coef_div = 13825,
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};
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static const struct armada_thermal_data armada375_data = {
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.is_valid = armada_is_valid,
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.init_sensor = armada375_init_sensor,
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.is_valid_shift = 10,
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.temp_shift = 0,
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.temp_mask = 0x1ff,
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.coef_b = 3171900000UL,
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.coef_m = 10000000UL,
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.coef_div = 13616,
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};
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static const struct armada_thermal_data armada380_data = {
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.is_valid = armada_is_valid,
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.init_sensor = armada380_init_sensor,
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.is_valid_shift = 10,
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.temp_shift = 0,
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.temp_mask = 0x3ff,
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.coef_b = 2931108200UL,
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.coef_m = 5000000UL,
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.coef_div = 10502,
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.inverted = true,
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};
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static const struct of_device_id armada_thermal_id_table[] = {
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{
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.compatible = "marvell,armadaxp-thermal",
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.data = &armadaxp_data,
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},
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{
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.compatible = "marvell,armada370-thermal",
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.data = &armada370_data,
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},
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{
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.compatible = "marvell,armada375-thermal",
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.data = &armada375_data,
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},
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{
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.compatible = "marvell,armada375-z1-thermal",
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.data = &armada375_data,
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},
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{
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.compatible = "marvell,armada380-thermal",
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.data = &armada380_data,
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},
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{
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/* sentinel */
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},
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};
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MODULE_DEVICE_TABLE(of, armada_thermal_id_table);
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static int armada_thermal_probe(struct platform_device *pdev)
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{
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struct thermal_zone_device *thermal;
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const struct of_device_id *match;
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struct armada_thermal_priv *priv;
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struct resource *res;
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match = of_match_device(armada_thermal_id_table, &pdev->dev);
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if (!match)
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return -ENODEV;
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priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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priv->sensor = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(priv->sensor))
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return PTR_ERR(priv->sensor);
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res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
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priv->control = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(priv->control))
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return PTR_ERR(priv->control);
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priv->data = (struct armada_thermal_data *)match->data;
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priv->data->init_sensor(pdev, priv);
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thermal = thermal_zone_device_register("armada_thermal", 0, 0,
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priv, &ops, NULL, 0, 0);
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if (IS_ERR(thermal)) {
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dev_err(&pdev->dev,
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"Failed to register thermal zone device\n");
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return PTR_ERR(thermal);
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}
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platform_set_drvdata(pdev, thermal);
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return 0;
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}
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static int armada_thermal_exit(struct platform_device *pdev)
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{
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struct thermal_zone_device *armada_thermal =
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platform_get_drvdata(pdev);
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thermal_zone_device_unregister(armada_thermal);
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return 0;
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}
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static struct platform_driver armada_thermal_driver = {
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.probe = armada_thermal_probe,
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.remove = armada_thermal_exit,
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.driver = {
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.name = "armada_thermal",
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.owner = THIS_MODULE,
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.of_match_table = armada_thermal_id_table,
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},
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};
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module_platform_driver(armada_thermal_driver);
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MODULE_AUTHOR("Ezequiel Garcia <ezequiel.garcia@free-electrons.com>");
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MODULE_DESCRIPTION("Armada 370/XP thermal driver");
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MODULE_LICENSE("GPL v2");
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