projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| a94cb7ee RM |
1 | /* |
| 2 | * Copyright (C) 2017 Rafał Miłecki <rafal@milecki.pl> | |
| 3 | * | |
| 4 | * This program is free software; you can redistribute it and/or modify | |
| 5 | * it under the terms of the GNU General Public License version 2 as | |
| 6 | * published by the Free Software Foundation. | |
| 7 | */ | |
| 8 | ||
| 9 | #include <linux/module.h> | |
| 10 | #include <linux/of_address.h> | |
| 11 | #include <linux/platform_device.h> | |
| 12 | #include <linux/thermal.h> | |
| 13 | ||
| 14 | #define PVTMON_CONTROL0 0x00 | |
| 15 | #define PVTMON_CONTROL0_SEL_MASK 0x0000000e | |
| 16 | #define PVTMON_CONTROL0_SEL_TEMP_MONITOR 0x00000000 | |
| 17 | #define PVTMON_CONTROL0_SEL_TEST_MODE 0x0000000e | |
| 18 | #define PVTMON_STATUS 0x08 | |
| 19 | ||
| 20 | struct ns_thermal { | |
| 21 | struct thermal_zone_device *tz; | |
| 22 | void __iomem *pvtmon; | |
| 23 | }; | |
| 24 | ||
| 25 | static int ns_thermal_get_temp(void *data, int *temp) | |
| 26 | { | |
| 27 | struct ns_thermal *ns_thermal = data; | |
| 28 | int offset = thermal_zone_get_offset(ns_thermal->tz); | |
| 29 | int slope = thermal_zone_get_slope(ns_thermal->tz); | |
| 30 | u32 val; | |
| 31 | ||
| 32 | val = readl(ns_thermal->pvtmon + PVTMON_CONTROL0); | |
| 33 | if ((val & PVTMON_CONTROL0_SEL_MASK) != PVTMON_CONTROL0_SEL_TEMP_MONITOR) { | |
| 34 | /* Clear current mode selection */ | |
| 35 | val &= ~PVTMON_CONTROL0_SEL_MASK; | |
| 36 | ||
| 37 | /* Set temp monitor mode (it's the default actually) */ | |
| 38 | val |= PVTMON_CONTROL0_SEL_TEMP_MONITOR; | |
| 39 | ||
| 40 | writel(val, ns_thermal->pvtmon + PVTMON_CONTROL0); | |
| 41 | } | |
| 42 | ||
| 43 | val = readl(ns_thermal->pvtmon + PVTMON_STATUS); | |
| 44 | *temp = slope * val + offset; | |
| 45 | ||
| 46 | return 0; | |
| 47 | } | |
| 48 | ||
| 49 | static const struct thermal_zone_of_device_ops ns_thermal_ops = { | |
| 50 | .get_temp = ns_thermal_get_temp, | |
| 51 | }; | |
| 52 | ||
| 53 | static int ns_thermal_probe(struct platform_device *pdev) | |
| 54 | { | |
| 55 | struct device *dev = &pdev->dev; | |
| 56 | struct ns_thermal *ns_thermal; | |
| 57 | ||
| 58 | ns_thermal = devm_kzalloc(dev, sizeof(*ns_thermal), GFP_KERNEL); | |
| 59 | if (!ns_thermal) | |
| 60 | return -ENOMEM; | |
| 61 | ||
| 62 | ns_thermal->pvtmon = of_iomap(dev_of_node(dev), 0); | |
| 63 | if (WARN_ON(!ns_thermal->pvtmon)) | |
| 64 | return -ENOENT; | |
| 65 | ||
| 66 | ns_thermal->tz = devm_thermal_zone_of_sensor_register(dev, 0, | |
| 67 | ns_thermal, | |
| 68 | &ns_thermal_ops); | |
| 69 | if (IS_ERR(ns_thermal->tz)) { | |
| 70 | iounmap(ns_thermal->pvtmon); | |
| 71 | return PTR_ERR(ns_thermal->tz); | |
| 72 | } | |
| 73 | ||
| 74 | platform_set_drvdata(pdev, ns_thermal); | |
| 75 | ||
| 76 | return 0; | |
| 77 | } | |
| 78 | ||
| 79 | static int ns_thermal_remove(struct platform_device *pdev) | |
| 80 | { | |
| 81 | struct ns_thermal *ns_thermal = platform_get_drvdata(pdev); | |
| 82 | ||
| 83 | iounmap(ns_thermal->pvtmon); | |
| 84 | ||
| 85 | return 0; | |
| 86 | } | |
| 87 | ||
| 88 | static const struct of_device_id ns_thermal_of_match[] = { | |
| 89 | { .compatible = "brcm,ns-thermal", }, | |
| 90 | {}, | |
| 91 | }; | |
| 92 | MODULE_DEVICE_TABLE(of, ns_thermal_of_match); | |
| 93 | ||
| 94 | static struct platform_driver ns_thermal_driver = { | |
| 95 | .probe = ns_thermal_probe, | |
| 96 | .remove = ns_thermal_remove, | |
| 97 | .driver = { | |
| 98 | .name = "ns-thermal", | |
| 99 | .of_match_table = ns_thermal_of_match, | |
| 100 | }, | |
| 101 | }; | |
| 102 | module_platform_driver(ns_thermal_driver); | |
| 103 | ||
| cb9b323b | 104 | MODULE_AUTHOR("Rafał Miłecki <rafal@milecki.pl>"); |
| a94cb7ee RM |
105 | MODULE_DESCRIPTION("Northstar thermal driver"); |
| 106 | MODULE_LICENSE("GPL v2"); |