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| 1 | /* |
| 2 | * Dove thermal sensor driver |
| 3 | * |
| 4 | * Copyright (C) 2013 Andrew Lunn <andrew@lunn.ch> |
| 5 | * |
| 6 | * This software is licensed under the terms of the GNU General Public |
| 7 | * License version 2, as published by the Free Software Foundation, and |
| 8 | * may be copied, distributed, and modified under those terms. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | */ |
| 16 | #include <linux/device.h> |
| 17 | #include <linux/err.h> |
| 18 | #include <linux/io.h> |
| 19 | #include <linux/kernel.h> |
| 20 | #include <linux/of.h> |
| 21 | #include <linux/module.h> |
| 22 | #include <linux/platform_device.h> |
| 23 | #include <linux/thermal.h> |
| 24 | |
| 25 | #define DOVE_THERMAL_TEMP_OFFSET 1 |
| 26 | #define DOVE_THERMAL_TEMP_MASK 0x1FF |
| 27 | |
| 28 | /* Dove Thermal Manager Control and Status Register */ |
| 29 | #define PMU_TM_DISABLE_OFFS 0 |
| 30 | #define PMU_TM_DISABLE_MASK (0x1 << PMU_TM_DISABLE_OFFS) |
| 31 | |
| 32 | /* Dove Theraml Diode Control 0 Register */ |
| 33 | #define PMU_TDC0_SW_RST_MASK (0x1 << 1) |
| 34 | #define PMU_TDC0_SEL_VCAL_OFFS 5 |
| 35 | #define PMU_TDC0_SEL_VCAL_MASK (0x3 << PMU_TDC0_SEL_VCAL_OFFS) |
| 36 | #define PMU_TDC0_REF_CAL_CNT_OFFS 11 |
| 37 | #define PMU_TDC0_REF_CAL_CNT_MASK (0x1FF << PMU_TDC0_REF_CAL_CNT_OFFS) |
| 38 | #define PMU_TDC0_AVG_NUM_OFFS 25 |
| 39 | #define PMU_TDC0_AVG_NUM_MASK (0x7 << PMU_TDC0_AVG_NUM_OFFS) |
| 40 | |
| 41 | /* Dove Thermal Diode Control 1 Register */ |
| 42 | #define PMU_TEMP_DIOD_CTRL1_REG 0x04 |
| 43 | #define PMU_TDC1_TEMP_VALID_MASK (0x1 << 10) |
| 44 | |
| 45 | /* Dove Thermal Sensor Dev Structure */ |
| 46 | struct dove_thermal_priv { |
| 47 | void __iomem *sensor; |
| 48 | void __iomem *control; |
| 49 | }; |
| 50 | |
| 51 | static int dove_init_sensor(const struct dove_thermal_priv *priv) |
| 52 | { |
| 53 | u32 reg; |
| 54 | u32 i; |
| 55 | |
| 56 | /* Configure the Diode Control Register #0 */ |
| 57 | reg = readl_relaxed(priv->control); |
| 58 | |
| 59 | /* Use average of 2 */ |
| 60 | reg &= ~PMU_TDC0_AVG_NUM_MASK; |
| 61 | reg |= (0x1 << PMU_TDC0_AVG_NUM_OFFS); |
| 62 | |
| 63 | /* Reference calibration value */ |
| 64 | reg &= ~PMU_TDC0_REF_CAL_CNT_MASK; |
| 65 | reg |= (0x0F1 << PMU_TDC0_REF_CAL_CNT_OFFS); |
| 66 | |
| 67 | /* Set the high level reference for calibration */ |
| 68 | reg &= ~PMU_TDC0_SEL_VCAL_MASK; |
| 69 | reg |= (0x2 << PMU_TDC0_SEL_VCAL_OFFS); |
| 70 | writel(reg, priv->control); |
| 71 | |
| 72 | /* Reset the sensor */ |
| 73 | reg = readl_relaxed(priv->control); |
| 74 | writel((reg | PMU_TDC0_SW_RST_MASK), priv->control); |
| 75 | writel(reg, priv->control); |
| 76 | |
| 77 | /* Enable the sensor */ |
| 78 | reg = readl_relaxed(priv->sensor); |
| 79 | reg &= ~PMU_TM_DISABLE_MASK; |
| 80 | writel(reg, priv->sensor); |
| 81 | |
| 82 | /* Poll the sensor for the first reading */ |
| 83 | for (i = 0; i < 1000000; i++) { |
| 84 | reg = readl_relaxed(priv->sensor); |
| 85 | if (reg & DOVE_THERMAL_TEMP_MASK) |
| 86 | break; |
| 87 | } |
| 88 | |
| 89 | if (i == 1000000) |
| 90 | return -EIO; |
| 91 | |
| 92 | return 0; |
| 93 | } |
| 94 | |
| 95 | static int dove_get_temp(struct thermal_zone_device *thermal, |
| 96 | unsigned long *temp) |
| 97 | { |
| 98 | unsigned long reg; |
| 99 | struct dove_thermal_priv *priv = thermal->devdata; |
| 100 | |
| 101 | /* Valid check */ |
| 102 | reg = readl_relaxed(priv->control + PMU_TEMP_DIOD_CTRL1_REG); |
| 103 | if ((reg & PMU_TDC1_TEMP_VALID_MASK) == 0x0) { |
| 104 | dev_err(&thermal->device, |
| 105 | "Temperature sensor reading not valid\n"); |
| 106 | return -EIO; |
| 107 | } |
| 108 | |
| 109 | /* |
| 110 | * Calculate temperature. See Section 8.10.1 of 88AP510, |
| 111 | * Documentation/arm/Marvell/README |
| 112 | */ |
| 113 | reg = readl_relaxed(priv->sensor); |
| 114 | reg = (reg >> DOVE_THERMAL_TEMP_OFFSET) & DOVE_THERMAL_TEMP_MASK; |
| 115 | *temp = ((2281638UL - (7298*reg)) / 10); |
| 116 | |
| 117 | return 0; |
| 118 | } |
| 119 | |
| 120 | static struct thermal_zone_device_ops ops = { |
| 121 | .get_temp = dove_get_temp, |
| 122 | }; |
| 123 | |
| 124 | static const struct of_device_id dove_thermal_id_table[] = { |
| 125 | { .compatible = "marvell,dove-thermal" }, |
| 126 | {} |
| 127 | }; |
| 128 | |
| 129 | static int dove_thermal_probe(struct platform_device *pdev) |
| 130 | { |
| 131 | struct thermal_zone_device *thermal = NULL; |
| 132 | struct dove_thermal_priv *priv; |
| 133 | struct resource *res; |
| 134 | int ret; |
| 135 | |
| 136 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 137 | if (!res) { |
| 138 | dev_err(&pdev->dev, "Failed to get platform resource\n"); |
| 139 | return -ENODEV; |
| 140 | } |
| 141 | |
| 142 | priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); |
| 143 | if (!priv) |
| 144 | return -ENOMEM; |
| 145 | |
| 146 | priv->sensor = devm_ioremap_resource(&pdev->dev, res); |
| 147 | if (IS_ERR(priv->sensor)) |
| 148 | return PTR_ERR(priv->sensor); |
| 149 | |
| 150 | res = platform_get_resource(pdev, IORESOURCE_MEM, 1); |
| 151 | if (!res) { |
| 152 | dev_err(&pdev->dev, "Failed to get platform resource\n"); |
| 153 | return -ENODEV; |
| 154 | } |
| 155 | priv->control = devm_ioremap_resource(&pdev->dev, res); |
| 156 | if (IS_ERR(priv->control)) |
| 157 | return PTR_ERR(priv->control); |
| 158 | |
| 159 | ret = dove_init_sensor(priv); |
| 160 | if (ret) { |
| 161 | dev_err(&pdev->dev, "Failed to initialize sensor\n"); |
| 162 | return ret; |
| 163 | } |
| 164 | |
| 165 | thermal = thermal_zone_device_register("dove_thermal", 0, 0, |
| 166 | priv, &ops, NULL, 0, 0); |
| 167 | if (IS_ERR(thermal)) { |
| 168 | dev_err(&pdev->dev, |
| 169 | "Failed to register thermal zone device\n"); |
| 170 | return PTR_ERR(thermal); |
| 171 | } |
| 172 | |
| 173 | platform_set_drvdata(pdev, thermal); |
| 174 | |
| 175 | return 0; |
| 176 | } |
| 177 | |
| 178 | static int dove_thermal_exit(struct platform_device *pdev) |
| 179 | { |
| 180 | struct thermal_zone_device *dove_thermal = |
| 181 | platform_get_drvdata(pdev); |
| 182 | |
| 183 | thermal_zone_device_unregister(dove_thermal); |
| 184 | platform_set_drvdata(pdev, NULL); |
| 185 | |
| 186 | return 0; |
| 187 | } |
| 188 | |
| 189 | MODULE_DEVICE_TABLE(of, dove_thermal_id_table); |
| 190 | |
| 191 | static struct platform_driver dove_thermal_driver = { |
| 192 | .probe = dove_thermal_probe, |
| 193 | .remove = dove_thermal_exit, |
| 194 | .driver = { |
| 195 | .name = "dove_thermal", |
| 196 | .owner = THIS_MODULE, |
| 197 | .of_match_table = of_match_ptr(dove_thermal_id_table), |
| 198 | }, |
| 199 | }; |
| 200 | |
| 201 | module_platform_driver(dove_thermal_driver); |
| 202 | |
| 203 | MODULE_AUTHOR("Andrew Lunn <andrew@lunn.ch>"); |
| 204 | MODULE_DESCRIPTION("Dove thermal driver"); |
| 205 | MODULE_LICENSE("GPL"); |
| 206 |
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Tags:
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