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113 lines
2.7 KiB
113 lines
2.7 KiB
// 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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struct thermal_zone_device *tz; |
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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(void *data, int *temp) |
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{ |
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struct sr_tmon *tmon = data; |
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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_of_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 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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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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tmon->tz = devm_thermal_zone_of_sensor_register(dev, i, tmon, |
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&sr_tz_ops); |
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if (IS_ERR(tmon->tz)) |
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return PTR_ERR(tmon->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 <[email protected]>"); |
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MODULE_DESCRIPTION("Stingray thermal driver"); |
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MODULE_LICENSE("GPL v2");
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