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