1 // SPDX-License-Identifier: GPL-2.0-only
2 // Copyright (c) 2021 Intel Corporation
4 #include <linux/auxiliary_bus.h>
5 #include <linux/module.h>
6 #include <linux/peci.h>
7 #include <linux/peci-cpu.h>
8 #include <linux/slab.h>
13 * peci_temp_read() - read the maximum die temperature from PECI target device
14 * @device: PECI device to which request is going to be sent
15 * @temp_raw: where to store the read temperature
17 * It uses GetTemp PECI command.
19 * Return: 0 if succeeded, other values in case errors.
21 int peci_temp_read(struct peci_device *device, s16 *temp_raw)
23 struct peci_request *req;
25 req = peci_xfer_get_temp(device);
29 *temp_raw = peci_request_temp_read(req);
31 peci_request_free(req);
35 EXPORT_SYMBOL_NS_GPL(peci_temp_read, PECI_CPU);
38 * peci_pcs_read() - read PCS register
39 * @device: PECI device to which request is going to be sent
41 * @param: PCS parameter
42 * @data: where to store the read data
44 * It uses RdPkgConfig PECI command.
46 * Return: 0 if succeeded, other values in case errors.
48 int peci_pcs_read(struct peci_device *device, u8 index, u16 param, u32 *data)
50 struct peci_request *req;
53 req = peci_xfer_pkg_cfg_readl(device, index, param);
57 ret = peci_request_status(req);
61 *data = peci_request_data_readl(req);
63 peci_request_free(req);
67 EXPORT_SYMBOL_NS_GPL(peci_pcs_read, PECI_CPU);
70 * peci_pci_local_read() - read 32-bit memory location using raw address
71 * @device: PECI device to which request is going to be sent
76 * @data: where to store the read data
78 * It uses RdPCIConfigLocal PECI command.
80 * Return: 0 if succeeded, other values in case errors.
82 int peci_pci_local_read(struct peci_device *device, u8 bus, u8 dev, u8 func,
85 struct peci_request *req;
88 req = peci_xfer_pci_cfg_local_readl(device, bus, dev, func, reg);
92 ret = peci_request_status(req);
96 *data = peci_request_data_readl(req);
98 peci_request_free(req);
102 EXPORT_SYMBOL_NS_GPL(peci_pci_local_read, PECI_CPU);
105 * peci_ep_pci_local_read() - read 32-bit memory location using raw address
106 * @device: PECI device to which request is going to be sent
112 * @data: where to store the read data
114 * Like &peci_pci_local_read, but it uses RdEndpointConfig PECI command.
116 * Return: 0 if succeeded, other values in case errors.
118 int peci_ep_pci_local_read(struct peci_device *device, u8 seg,
119 u8 bus, u8 dev, u8 func, u16 reg, u32 *data)
121 struct peci_request *req;
124 req = peci_xfer_ep_pci_cfg_local_readl(device, seg, bus, dev, func, reg);
128 ret = peci_request_status(req);
132 *data = peci_request_data_readl(req);
134 peci_request_free(req);
138 EXPORT_SYMBOL_NS_GPL(peci_ep_pci_local_read, PECI_CPU);
141 * peci_mmio_read() - read 32-bit memory location using 64-bit bar offset address
142 * @device: PECI device to which request is going to be sent
148 * @address: 64-bit MMIO address
149 * @data: where to store the read data
151 * It uses RdEndpointConfig PECI command.
153 * Return: 0 if succeeded, other values in case errors.
155 int peci_mmio_read(struct peci_device *device, u8 bar, u8 seg,
156 u8 bus, u8 dev, u8 func, u64 address, u32 *data)
158 struct peci_request *req;
161 req = peci_xfer_ep_mmio64_readl(device, bar, seg, bus, dev, func, address);
165 ret = peci_request_status(req);
169 *data = peci_request_data_readl(req);
171 peci_request_free(req);
175 EXPORT_SYMBOL_NS_GPL(peci_mmio_read, PECI_CPU);
177 static const char * const peci_adev_types[] = {
183 struct peci_device *device;
184 const struct peci_device_id *id;
187 static void adev_release(struct device *dev)
189 struct auxiliary_device *adev = to_auxiliary_dev(dev);
195 static struct auxiliary_device *adev_alloc(struct peci_cpu *priv, int idx)
197 struct peci_controller *controller = to_peci_controller(priv->device->dev.parent);
198 struct auxiliary_device *adev;
202 adev = kzalloc(sizeof(*adev), GFP_KERNEL);
204 return ERR_PTR(-ENOMEM);
206 name = kasprintf(GFP_KERNEL, "%s.%s", peci_adev_types[idx], (const char *)priv->id->data);
213 adev->dev.parent = &priv->device->dev;
214 adev->dev.release = adev_release;
215 adev->id = (controller->id << 16) | (priv->device->addr);
217 ret = auxiliary_device_init(adev);
230 static void unregister_adev(void *_adev)
232 struct auxiliary_device *adev = _adev;
234 auxiliary_device_delete(adev);
235 auxiliary_device_uninit(adev);
238 static int devm_adev_add(struct device *dev, int idx)
240 struct peci_cpu *priv = dev_get_drvdata(dev);
241 struct auxiliary_device *adev;
244 adev = adev_alloc(priv, idx);
246 return PTR_ERR(adev);
248 ret = auxiliary_device_add(adev);
250 auxiliary_device_uninit(adev);
254 ret = devm_add_action_or_reset(&priv->device->dev, unregister_adev, adev);
261 static void peci_cpu_add_adevices(struct peci_cpu *priv)
263 struct device *dev = &priv->device->dev;
266 for (i = 0; i < ARRAY_SIZE(peci_adev_types); i++) {
267 ret = devm_adev_add(dev, i);
269 dev_warn(dev, "Failed to register PECI auxiliary: %s, ret = %d\n",
270 peci_adev_types[i], ret);
277 peci_cpu_probe(struct peci_device *device, const struct peci_device_id *id)
279 struct device *dev = &device->dev;
280 struct peci_cpu *priv;
282 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
286 dev_set_drvdata(dev, priv);
287 priv->device = device;
290 peci_cpu_add_adevices(priv);
295 static const struct peci_device_id peci_cpu_device_ids[] = {
298 .model = INTEL_FAM6_HASWELL_X,
301 { /* Broadwell Xeon */
303 .model = INTEL_FAM6_BROADWELL_X,
306 { /* Broadwell Xeon D */
308 .model = INTEL_FAM6_BROADWELL_D,
313 .model = INTEL_FAM6_SKYLAKE_X,
318 .model = INTEL_FAM6_ICELAKE_X,
321 { /* Icelake Xeon D */
323 .model = INTEL_FAM6_ICELAKE_D,
328 MODULE_DEVICE_TABLE(peci, peci_cpu_device_ids);
330 static struct peci_driver peci_cpu_driver = {
331 .probe = peci_cpu_probe,
332 .id_table = peci_cpu_device_ids,
337 module_peci_driver(peci_cpu_driver);
339 MODULE_AUTHOR("Iwona Winiarska <iwona.winiarska@intel.com>");
340 MODULE_DESCRIPTION("PECI CPU driver");
341 MODULE_LICENSE("GPL");
342 MODULE_IMPORT_NS(PECI);