1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * k8temp.c - Linux kernel module for hardware monitoring
19 #define TEMP_FROM_REG(val)	(((((val) >> 16) & 0xff) - 49) * 1000)
28 	u8 sensorsp;		/* sensor presence bits - SEL_CORE, SEL_PLACE */
76 	if ((channel & 1) && !(data->sensorsp & SEL_PLACE))  in k8temp_is_visible()
79 	if ((channel & 2) && !(data->sensorsp & SEL_CORE))  in k8temp_is_visible()
90 	struct pci_dev *pdev = to_pci_dev(dev->parent);  in k8temp_read()
92 	u32 temp;  in k8temp_read()  local
98 	core ^= data->swap_core_select;  in k8temp_read()
100 	mutex_lock(&data->update_lock);  in k8temp_read()
108 	pci_read_config_dword(pdev, REG_TEMP, &temp);  in k8temp_read()
109 	mutex_unlock(&data->update_lock);  in k8temp_read()
111 	*val = TEMP_FROM_REG(temp) + data->temp_offset;  in k8temp_read()
122 	HWMON_CHANNEL_INFO(temp,
136 	u32 temp;  in k8temp_probe()  local
141 	data = devm_kzalloc(&pdev->dev, sizeof(struct k8temp_data), GFP_KERNEL);  in k8temp_probe()
143 		return -ENOMEM;  in k8temp_probe()
148 	/* feature available since SH-C0, exclude older revisions */  in k8temp_probe()
151 		return -ENODEV;  in k8temp_probe()
158 		data->swap_core_select = 1;  in k8temp_probe()
159 		dev_warn(&pdev->dev,  in k8temp_probe()
160 			 "Temperature readouts might be wrong - check erratum #141\n");  in k8temp_probe()
169 		data->temp_offset = 21000;  in k8temp_probe()
172 	scfg &= ~(SEL_PLACE | SEL_CORE);	/* Select sensor 0, core0 */  in k8temp_probe()
177 		dev_err(&pdev->dev, "Configuration bit(s) stuck at 1!\n");  in k8temp_probe()
178 		return -ENODEV;  in k8temp_probe()
184 	/* now we know if we can change core and/or sensor */  in k8temp_probe()
185 	pci_read_config_byte(pdev, REG_TEMP, &data->sensorsp);  in k8temp_probe()
187 	if (data->sensorsp & SEL_PLACE) {  in k8temp_probe()
188 		scfg &= ~SEL_CORE;	/* Select sensor 1, core0 */  in k8temp_probe()
190 		pci_read_config_dword(pdev, REG_TEMP, &temp);  in k8temp_probe()
192 		if (!((temp >> 16) & 0xff)) /* if temp is 0 -49C is unlikely */  in k8temp_probe()
193 			data->sensorsp &= ~SEL_PLACE;  in k8temp_probe()
196 	if (data->sensorsp & SEL_CORE) {  in k8temp_probe()
197 		scfg &= ~SEL_PLACE;	/* Select sensor 0, core1 */  in k8temp_probe()
199 		pci_read_config_dword(pdev, REG_TEMP, &temp);  in k8temp_probe()
200 		if (!((temp >> 16) & 0xff)) /* if temp is 0 -49C is unlikely */  in k8temp_probe()
201 			data->sensorsp &= ~SEL_CORE;  in k8temp_probe()
204 	mutex_init(&data->update_lock);  in k8temp_probe()
206 	hwmon_dev = devm_hwmon_device_register_with_info(&pdev->dev,  in k8temp_probe()