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 sr_thermal->regs = (void __iomem *)devm_memremap(&pdev->dev, res->start, 64 resource_size(res), 65 MEMREMAP_WB); 66 if (IS_ERR(sr_thermal->regs)) { 67 dev_err(dev, "failed to get io address\n"); 68 return PTR_ERR(sr_thermal->regs); 69 } 70 71 ret = device_property_read_u32(dev, "brcm,tmon-mask", &sr_tmon_list); 72 if (ret) 73 return ret; 74 75 tmon = sr_thermal->tmon; 76 for (i = 0; i < SR_TMON_MAX_LIST; i++, tmon++) { 77 if (!(sr_tmon_list & BIT(i))) 78 continue; 79 80 /* Flush temperature registers */ 81 writel(0, sr_thermal->regs + SR_TMON_TEMP_BASE(i)); 82 tmon->tmon_id = i; 83 tmon->priv = sr_thermal; 84 tmon->tz = devm_thermal_zone_of_sensor_register(dev, i, tmon, 85 &sr_tz_ops); 86 if (IS_ERR(tmon->tz)) 87 return PTR_ERR(tmon->tz); 88 89 dev_dbg(dev, "thermal sensor %d registered\n", i); 90 } 91 platform_set_drvdata(pdev, sr_thermal); 92 93 return 0; 94 } 95 96 static const struct of_device_id sr_thermal_of_match[] = { 97 { .compatible = "brcm,sr-thermal", }, 98 {}, 99 }; 100 MODULE_DEVICE_TABLE(of, sr_thermal_of_match); 101 102 static struct platform_driver sr_thermal_driver = { 103 .probe = sr_thermal_probe, 104 .driver = { 105 .name = "sr-thermal", 106 .of_match_table = sr_thermal_of_match, 107 }, 108 }; 109 module_platform_driver(sr_thermal_driver); 110 111 MODULE_AUTHOR("Pramod Kumar <pramod.kumar@broadcom.com>"); 112 MODULE_DESCRIPTION("Stingray thermal driver"); 113 MODULE_LICENSE("GPL v2"); 114