117 lines
2.7 KiB
C
117 lines
2.7 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2018 Broadcom
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*/
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#include <linux/module.h>
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#include <linux/of_address.h>
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#include <linux/platform_device.h>
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#include <linux/thermal.h>
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/*
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* In stingray thermal IO memory,
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* Total Number of available TMONs MASK is at offset 0
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* temperature registers BASE is at 4 byte offset.
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* Each TMON temperature register size is 4.
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*/
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#define SR_TMON_TEMP_BASE(id) ((id) * 0x4)
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#define SR_TMON_MAX_LIST 6
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struct sr_tmon {
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unsigned int crit_temp;
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unsigned int tmon_id;
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struct sr_thermal *priv;
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};
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struct sr_thermal {
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void __iomem *regs;
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unsigned int max_crit_temp;
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struct sr_tmon tmon[SR_TMON_MAX_LIST];
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};
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static int sr_get_temp(struct thermal_zone_device *tz, int *temp)
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{
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struct sr_tmon *tmon = tz->devdata;
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struct sr_thermal *sr_thermal = tmon->priv;
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*temp = readl(sr_thermal->regs + SR_TMON_TEMP_BASE(tmon->tmon_id));
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return 0;
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}
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static const struct thermal_zone_device_ops sr_tz_ops = {
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.get_temp = sr_get_temp,
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};
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static int sr_thermal_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct thermal_zone_device *tz;
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struct sr_thermal *sr_thermal;
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struct sr_tmon *tmon;
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struct resource *res;
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u32 sr_tmon_list = 0;
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unsigned int i;
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int ret;
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sr_thermal = devm_kzalloc(dev, sizeof(*sr_thermal), GFP_KERNEL);
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if (!sr_thermal)
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return -ENOMEM;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!res)
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return -ENOENT;
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sr_thermal->regs = (void __iomem *)devm_memremap(&pdev->dev, res->start,
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resource_size(res),
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MEMREMAP_WB);
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if (IS_ERR(sr_thermal->regs)) {
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dev_err(dev, "failed to get io address\n");
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return PTR_ERR(sr_thermal->regs);
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}
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ret = device_property_read_u32(dev, "brcm,tmon-mask", &sr_tmon_list);
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if (ret)
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return ret;
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tmon = sr_thermal->tmon;
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for (i = 0; i < SR_TMON_MAX_LIST; i++, tmon++) {
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if (!(sr_tmon_list & BIT(i)))
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continue;
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/* Flush temperature registers */
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writel(0, sr_thermal->regs + SR_TMON_TEMP_BASE(i));
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tmon->tmon_id = i;
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tmon->priv = sr_thermal;
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tz = devm_thermal_of_zone_register(dev, i, tmon,
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&sr_tz_ops);
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if (IS_ERR(tz))
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return PTR_ERR(tz);
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dev_dbg(dev, "thermal sensor %d registered\n", i);
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}
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platform_set_drvdata(pdev, sr_thermal);
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return 0;
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}
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static const struct of_device_id sr_thermal_of_match[] = {
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{ .compatible = "brcm,sr-thermal", },
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{},
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};
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MODULE_DEVICE_TABLE(of, sr_thermal_of_match);
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static struct platform_driver sr_thermal_driver = {
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.probe = sr_thermal_probe,
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.driver = {
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.name = "sr-thermal",
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.of_match_table = sr_thermal_of_match,
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},
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};
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module_platform_driver(sr_thermal_driver);
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MODULE_AUTHOR("Pramod Kumar <pramod.kumar@broadcom.com>");
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MODULE_DESCRIPTION("Stingray thermal driver");
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MODULE_LICENSE("GPL v2");
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