1 // SPDX-License-Identifier: GPL-2.0-only
3 #include <linux/io-64-nonatomic-lo-hi.h>
4 #include <linux/device.h>
12  * CXL device capabilities are enumerated by PCI DVSEC (Designated
13  * Vendor-specific) and / or descriptors provided by platform firmware.
14  * They can be defined as a set like the device and component registers
15  * mandated by CXL Section 8.1.12.2 Memory Device PCIe Capabilities and
24  * cxl_probe_component_regs() - Detect CXL Component register blocks
25  * @dev: Host device of the @base mapping
30  * See CXL 2.0 8.2.5.5 CXL Device Register Interface
34 void cxl_probe_component_regs(struct device *dev, void __iomem *base,  in cxl_probe_component_regs()
82 			map->hdm_decoder.valid = true;  in cxl_probe_component_regs()
83 			map->hdm_decoder.offset = CXL_CM_OFFSET + offset;  in cxl_probe_component_regs()
84 			map->hdm_decoder.size = length;  in cxl_probe_component_regs()
96  * cxl_probe_device_regs() - Detect CXL Device register blocks
97  * @dev: Host device of the @base mapping
98  * @base: Mapping of CXL 2.0 8.2.8 CXL Device Register Interface
101  * Probe for device register information and return it in map object.
103 void cxl_probe_device_regs(struct device *dev, void __iomem *base,  in cxl_probe_device_regs()
131 			map->status.valid = true;  in cxl_probe_device_regs()
132 			map->status.offset = offset;  in cxl_probe_device_regs()
133 			map->status.size = length;  in cxl_probe_device_regs()
137 			map->mbox.valid = true;  in cxl_probe_device_regs()
138 			map->mbox.offset = offset;  in cxl_probe_device_regs()
139 			map->mbox.size = length;  in cxl_probe_device_regs()
145 			dev_dbg(dev, "found Memory Device capability (0x%x)\n", offset);  in cxl_probe_device_regs()
146 			map->memdev.valid = true;  in cxl_probe_device_regs()
147 			map->memdev.offset = offset;  in cxl_probe_device_regs()
148 			map->memdev.size = length;  in cxl_probe_device_regs()
161 static void __iomem *devm_cxl_iomap_block(struct device *dev,  in devm_cxl_iomap_block()
162 					  resource_size_t addr,  in devm_cxl_iomap_block()  argument
168 	res = devm_request_mem_region(dev, addr, length, dev_name(dev));  in devm_cxl_iomap_block()
170 		resource_size_t end = addr + length - 1;  in devm_cxl_iomap_block()
172 		dev_err(dev, "Failed to request region %pa-%pa\n", &addr, &end);  in devm_cxl_iomap_block()
176 	ret_val = devm_ioremap(dev, addr, length);  in devm_cxl_iomap_block()
187 	struct device *dev = &pdev->dev;  in cxl_map_component_regs()
191 	phys_addr = pci_resource_start(pdev, map->barno);  in cxl_map_component_regs()
192 	phys_addr += map->block_offset;  in cxl_map_component_regs()
194 	phys_addr += map->component_map.hdm_decoder.offset;  in cxl_map_component_regs()
195 	length = map->component_map.hdm_decoder.size;  in cxl_map_component_regs()
196 	regs->hdm_decoder = devm_cxl_iomap_block(dev, phys_addr, length);  in cxl_map_component_regs()
197 	if (!regs->hdm_decoder)  in cxl_map_component_regs()
198 		return -ENOMEM;  in cxl_map_component_regs()
208 	struct device *dev = &pdev->dev;  in cxl_map_device_regs()
211 	phys_addr = pci_resource_start(pdev, map->barno);  in cxl_map_device_regs()
212 	phys_addr += map->block_offset;  in cxl_map_device_regs()
214 	if (map->device_map.status.valid) {  in cxl_map_device_regs()
215 		resource_size_t addr;  in cxl_map_device_regs()  local
218 		addr = phys_addr + map->device_map.status.offset;  in cxl_map_device_regs()
219 		length = map->device_map.status.size;  in cxl_map_device_regs()
220 		regs->status = devm_cxl_iomap_block(dev, addr, length);  in cxl_map_device_regs()
221 		if (!regs->status)  in cxl_map_device_regs()
222 			return -ENOMEM;  in cxl_map_device_regs()
225 	if (map->device_map.mbox.valid) {  in cxl_map_device_regs()
226 		resource_size_t addr;  in cxl_map_device_regs()  local
229 		addr = phys_addr + map->device_map.mbox.offset;  in cxl_map_device_regs()
230 		length = map->device_map.mbox.size;  in cxl_map_device_regs()
231 		regs->mbox = devm_cxl_iomap_block(dev, addr, length);  in cxl_map_device_regs()
232 		if (!regs->mbox)  in cxl_map_device_regs()
233 			return -ENOMEM;  in cxl_map_device_regs()
236 	if (map->device_map.memdev.valid) {  in cxl_map_device_regs()
237 		resource_size_t addr;  in cxl_map_device_regs()  local
240 		addr = phys_addr + map->device_map.memdev.offset;  in cxl_map_device_regs()
241 		length = map->device_map.memdev.size;  in cxl_map_device_regs()
242 		regs->memdev = devm_cxl_iomap_block(dev, addr, length);  in cxl_map_device_regs()
243 		if (!regs->memdev)  in cxl_map_device_regs()
244 			return -ENOMEM;  in cxl_map_device_regs()