// SPDX-License-Identifier: GPL-2.0-only /* * Dove thermal sensor driver * * Copyright (C) 2013 Andrew Lunn */ #include #include #include #include #include #include #include #include #define DOVE_THERMAL_TEMP_OFFSET 1 #define DOVE_THERMAL_TEMP_MASK 0x1FF /* Dove Thermal Manager Control and Status Register */ #define PMU_TM_DISABLE_OFFS 0 #define PMU_TM_DISABLE_MASK (0x1 << PMU_TM_DISABLE_OFFS) /* Dove Theraml Diode Control 0 Register */ #define PMU_TDC0_SW_RST_MASK (0x1 << 1) #define PMU_TDC0_SEL_VCAL_OFFS 5 #define PMU_TDC0_SEL_VCAL_MASK (0x3 << PMU_TDC0_SEL_VCAL_OFFS) #define PMU_TDC0_REF_CAL_CNT_OFFS 11 #define PMU_TDC0_REF_CAL_CNT_MASK (0x1FF << PMU_TDC0_REF_CAL_CNT_OFFS) #define PMU_TDC0_AVG_NUM_OFFS 25 #define PMU_TDC0_AVG_NUM_MASK (0x7 << PMU_TDC0_AVG_NUM_OFFS) /* Dove Thermal Diode Control 1 Register */ #define PMU_TEMP_DIOD_CTRL1_REG 0x04 #define PMU_TDC1_TEMP_VALID_MASK (0x1 << 10) /* Dove Thermal Sensor Dev Structure */ struct dove_thermal_priv { void __iomem *sensor; void __iomem *control; }; static int dove_init_sensor(const struct dove_thermal_priv *priv) { u32 reg; u32 i; /* Configure the Diode Control Register #0 */ reg = readl_relaxed(priv->control); /* Use average of 2 */ reg &= ~PMU_TDC0_AVG_NUM_MASK; reg |= (0x1 << PMU_TDC0_AVG_NUM_OFFS); /* Reference calibration value */ reg &= ~PMU_TDC0_REF_CAL_CNT_MASK; reg |= (0x0F1 << PMU_TDC0_REF_CAL_CNT_OFFS); /* Set the high level reference for calibration */ reg &= ~PMU_TDC0_SEL_VCAL_MASK; reg |= (0x2 << PMU_TDC0_SEL_VCAL_OFFS); writel(reg, priv->control); /* Reset the sensor */ reg = readl_relaxed(priv->control); writel((reg | PMU_TDC0_SW_RST_MASK), priv->control); writel(reg, priv->control); /* Enable the sensor */ reg = readl_relaxed(priv->sensor); reg &= ~PMU_TM_DISABLE_MASK; writel(reg, priv->sensor); /* Poll the sensor for the first reading */ for (i = 0; i < 1000000; i++) { reg = readl_relaxed(priv->sensor); if (reg & DOVE_THERMAL_TEMP_MASK) break; } if (i == 1000000) return -EIO; return 0; } static int dove_get_temp(struct thermal_zone_device *thermal, int *temp) { unsigned long reg; struct dove_thermal_priv *priv = thermal->devdata; /* Valid check */ reg = readl_relaxed(priv->control + PMU_TEMP_DIOD_CTRL1_REG); if ((reg & PMU_TDC1_TEMP_VALID_MASK) == 0x0) { dev_err(&thermal->device, "Temperature sensor reading not valid\n"); return -EIO; } /* * Calculate temperature. According to Marvell internal * documentation the formula for this is: * Celsius = (322-reg)/1.3625 */ reg = readl_relaxed(priv->sensor); reg = (reg >> DOVE_THERMAL_TEMP_OFFSET) & DOVE_THERMAL_TEMP_MASK; *temp = ((3220000000UL - (10000000UL * reg)) / 13625); return 0; } static struct thermal_zone_device_ops ops = { .get_temp = dove_get_temp, }; static const struct of_device_id dove_thermal_id_table[] = { { .compatible = "marvell,dove-thermal" }, {} }; static int dove_thermal_probe(struct platform_device *pdev) { struct thermal_zone_device *thermal = NULL; struct dove_thermal_priv *priv; struct resource *res; int ret; priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); if (!priv) return -ENOMEM; res = platform_get_resource(pdev, IORESOURCE_MEM, 0); priv->sensor = devm_ioremap_resource(&pdev->dev, res); if (IS_ERR(priv->sensor)) return PTR_ERR(priv->sensor); res = platform_get_resource(pdev, IORESOURCE_MEM, 1); priv->control = devm_ioremap_resource(&pdev->dev, res); if (IS_ERR(priv->control)) return PTR_ERR(priv->control); ret = dove_init_sensor(priv); if (ret) { dev_err(&pdev->dev, "Failed to initialize sensor\n"); return ret; } thermal = thermal_zone_device_register("dove_thermal", 0, 0, priv, &ops, NULL, 0, 0); if (IS_ERR(thermal)) { dev_err(&pdev->dev, "Failed to register thermal zone device\n"); return PTR_ERR(thermal); } platform_set_drvdata(pdev, thermal); return 0; } static int dove_thermal_exit(struct platform_device *pdev) { struct thermal_zone_device *dove_thermal = platform_get_drvdata(pdev); thermal_zone_device_unregister(dove_thermal); return 0; } MODULE_DEVICE_TABLE(of, dove_thermal_id_table); static struct platform_driver dove_thermal_driver = { .probe = dove_thermal_probe, .remove = dove_thermal_exit, .driver = { .name = "dove_thermal", .of_match_table = dove_thermal_id_table, }, }; module_platform_driver(dove_thermal_driver); MODULE_AUTHOR("Andrew Lunn "); MODULE_DESCRIPTION("Dove thermal driver"); MODULE_LICENSE("GPL"); a id='n62' href='#n62'>62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168