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 unsigned int crit_temp; 23 unsigned int tmon_id; 24 struct sr_thermal *priv; 25 }; 26 27 struct sr_thermal { 28 void __iomem *regs; 29 unsigned int max_crit_temp; 30 struct sr_tmon tmon[SR_TMON_MAX_LIST]; 31 }; 32 33 static int sr_get_temp(struct thermal_zone_device *tz, int *temp) 34 { 35 struct sr_tmon *tmon = thermal_zone_device_priv(tz); 36 struct sr_thermal *sr_thermal = tmon->priv; 37 38 *temp = readl(sr_thermal->regs + SR_TMON_TEMP_BASE(tmon->tmon_id)); 39 40 return 0; 41 } 42 43 static const struct thermal_zone_device_ops sr_tz_ops = { 44 .get_temp = sr_get_temp, 45 }; 46 47 static int sr_thermal_probe(struct platform_device *pdev) 48 { 49 struct device *dev = &pdev->dev; 50 struct thermal_zone_device *tz; 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 tz = devm_thermal_of_zone_register(dev, i, tmon, 88 &sr_tz_ops); 89 if (IS_ERR(tz)) 90 return PTR_ERR(tz); 91 92 dev_dbg(dev, "thermal sensor %d registered\n", i); 93 } 94 95 return 0; 96 } 97 98 static const struct of_device_id sr_thermal_of_match[] = { 99 { .compatible = "brcm,sr-thermal", }, 100 {}, 101 }; 102 MODULE_DEVICE_TABLE(of, sr_thermal_of_match); 103 104 static struct platform_driver sr_thermal_driver = { 105 .probe = sr_thermal_probe, 106 .driver = { 107 .name = "sr-thermal", 108 .of_match_table = sr_thermal_of_match, 109 }, 110 }; 111 module_platform_driver(sr_thermal_driver); 112 113 MODULE_AUTHOR("Pramod Kumar <pramod.kumar@broadcom.com>"); 114 MODULE_DESCRIPTION("Stingray thermal driver"); 115 MODULE_LICENSE("GPL v2"); 116