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