LXR linux/drivers/thermal/broadcom/sr-thermal.c

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * Copyright (C) 2018 Broadcom
   4 */
   5
   6#include <linux/acpi.h>
   7#include <linux/module.h>
   8#include <linux/of_address.h>
   9#include <linux/platform_device.h>
  10#include <linux/thermal.h>
  11
  12/*
  13 * In stingray thermal IO memory,
  14 * Total Number of available TMONs MASK is at offset 0
  15 * temperature registers BASE is at 4 byte offset.
  16 * Each TMON temperature register size is 4.
  17 */
  18#define SR_TMON_TEMP_BASE(id)   ((id) * 0x4)
  19
  20#define SR_TMON_MAX_LIST        6
  21
  22struct sr_tmon {
  23        struct thermal_zone_device *tz;
  24        unsigned int crit_temp;
  25        unsigned int tmon_id;
  26        struct sr_thermal *priv;
  27};
  28
  29struct sr_thermal {
  30        void __iomem *regs;
  31        unsigned int max_crit_temp;
  32        struct sr_tmon tmon[SR_TMON_MAX_LIST];
  33};
  34
  35static int sr_get_temp(void *data, int *temp)
  36{
  37        struct sr_tmon *tmon = data;
  38        struct sr_thermal *sr_thermal = tmon->priv;
  39
  40        *temp = readl(sr_thermal->regs + SR_TMON_TEMP_BASE(tmon->tmon_id));
  41
  42        return 0;
  43}
  44
  45static const struct thermal_zone_of_device_ops sr_tz_ops = {
  46        .get_temp = sr_get_temp,
  47};
  48
  49static int sr_thermal_probe(struct platform_device *pdev)
  50{
  51        struct device *dev = &pdev->dev;
  52        struct sr_thermal *sr_thermal;
  53        struct sr_tmon *tmon;
  54        struct resource *res;
  55        u32 sr_tmon_list = 0;
  56        unsigned int i;
  57        int ret;
  58
  59        sr_thermal = devm_kzalloc(dev, sizeof(*sr_thermal), GFP_KERNEL);
  60        if (!sr_thermal)
  61                return -ENOMEM;
  62
  63        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  64        sr_thermal->regs = (void __iomem *)devm_memremap(&pdev->dev, res->start,
  65                                                         resource_size(res),
  66                                                         MEMREMAP_WB);
  67        if (IS_ERR(sr_thermal->regs)) {
  68                dev_err(dev, "failed to get io address\n");
  69                return PTR_ERR(sr_thermal->regs);
  70        }
  71
  72        ret = device_property_read_u32(dev, "brcm,tmon-mask", &sr_tmon_list);
  73        if (ret)
  74                return ret;
  75
  76        tmon = sr_thermal->tmon;
  77        for (i = 0; i < SR_TMON_MAX_LIST; i++, tmon++) {
  78                if (!(sr_tmon_list & BIT(i)))
  79                        continue;
  80
  81                /* Flush temperature registers */
  82                writel(0, sr_thermal->regs + SR_TMON_TEMP_BASE(i));
  83                tmon->tmon_id = i;
  84                tmon->priv = sr_thermal;
  85                tmon->tz = devm_thermal_zone_of_sensor_register(dev, i, tmon,
  86                                                                &sr_tz_ops);
  87                if (IS_ERR(tmon->tz))
  88                        return PTR_ERR(tmon->tz);
  89
  90                dev_dbg(dev, "thermal sensor %d registered\n", i);
  91        }
  92        platform_set_drvdata(pdev, sr_thermal);
  93
  94        return 0;
  95}
  96
  97static const struct of_device_id sr_thermal_of_match[] = {
  98        { .compatible = "brcm,sr-thermal", },
  99        {},
 100};
 101MODULE_DEVICE_TABLE(of, sr_thermal_of_match);
 102
 103static const struct acpi_device_id sr_thermal_acpi_ids[] = {
 104        { .id = "BRCM0500" },
 105        { /* sentinel */ }
 106};
 107MODULE_DEVICE_TABLE(acpi, sr_thermal_acpi_ids);
 108
 109static struct platform_driver sr_thermal_driver = {
 110        .probe          = sr_thermal_probe,
 111        .driver = {
 112                .name = "sr-thermal",
 113                .of_match_table = sr_thermal_of_match,
 114                .acpi_match_table = ACPI_PTR(sr_thermal_acpi_ids),
 115        },
 116};
 117module_platform_driver(sr_thermal_driver);
 118
 119MODULE_AUTHOR("Pramod Kumar <pramod.kumar@broadcom.com>");
 120MODULE_DESCRIPTION("Stingray thermal driver");
 121MODULE_LICENSE("GPL v2");
 122