1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /* Copyright(c) 2020 Intel Corporation. All rights reserved. */
3 #ifndef __CXL_PCI_H__
4 #define __CXL_PCI_H__
5 #include <linux/pci.h>
6 #include "cxl.h"
7
8 #define CXL_MEMORY_PROGIF 0x10
9
10 /*
11 * See section 8.1 Configuration Space Registers in the CXL 2.0
12 * Specification. Names are taken straight from the specification with "CXL" and
13 * "DVSEC" redundancies removed. When obvious, abbreviations may be used.
14 */
15 #define PCI_DVSEC_HEADER1_LENGTH_MASK GENMASK(31, 20)
16 #define PCI_DVSEC_VENDOR_ID_CXL 0x1E98
17
18 /* CXL 2.0 8.1.3: PCIe DVSEC for CXL Device */
19 #define CXL_DVSEC_PCIE_DEVICE 0
20 #define CXL_DVSEC_CAP_OFFSET 0xA
21 #define CXL_DVSEC_MEM_CAPABLE BIT(2)
22 #define CXL_DVSEC_HDM_COUNT_MASK GENMASK(5, 4)
23 #define CXL_DVSEC_CTRL_OFFSET 0xC
24 #define CXL_DVSEC_MEM_ENABLE BIT(2)
25 #define CXL_DVSEC_RANGE_SIZE_HIGH(i) (0x18 + (i * 0x10))
26 #define CXL_DVSEC_RANGE_SIZE_LOW(i) (0x1C + (i * 0x10))
27 #define CXL_DVSEC_MEM_INFO_VALID BIT(0)
28 #define CXL_DVSEC_MEM_ACTIVE BIT(1)
29 #define CXL_DVSEC_MEM_SIZE_LOW_MASK GENMASK(31, 28)
30 #define CXL_DVSEC_RANGE_BASE_HIGH(i) (0x20 + (i * 0x10))
31 #define CXL_DVSEC_RANGE_BASE_LOW(i) (0x24 + (i * 0x10))
32 #define CXL_DVSEC_MEM_BASE_LOW_MASK GENMASK(31, 28)
33
34 #define CXL_DVSEC_RANGE_MAX 2
35
36 /* CXL 2.0 8.1.4: Non-CXL Function Map DVSEC */
37 #define CXL_DVSEC_FUNCTION_MAP 2
38
39 /* CXL 2.0 8.1.5: CXL 2.0 Extensions DVSEC for Ports */
40 #define CXL_DVSEC_PORT_EXTENSIONS 3
41
42 /* CXL 2.0 8.1.6: GPF DVSEC for CXL Port */
43 #define CXL_DVSEC_PORT_GPF 4
44
45 /* CXL 2.0 8.1.7: GPF DVSEC for CXL Device */
46 #define CXL_DVSEC_DEVICE_GPF 5
47
48 /* CXL 2.0 8.1.8: PCIe DVSEC for Flex Bus Port */
49 #define CXL_DVSEC_PCIE_FLEXBUS_PORT 7
50
51 /* CXL 2.0 8.1.9: Register Locator DVSEC */
52 #define CXL_DVSEC_REG_LOCATOR 8
53 #define CXL_DVSEC_REG_LOCATOR_BLOCK1_OFFSET 0xC
54 #define CXL_DVSEC_REG_LOCATOR_BIR_MASK GENMASK(2, 0)
55 #define CXL_DVSEC_REG_LOCATOR_BLOCK_ID_MASK GENMASK(15, 8)
56 #define CXL_DVSEC_REG_LOCATOR_BLOCK_OFF_LOW_MASK GENMASK(31, 16)
57
58 /* Register Block Identifier (RBI) */
59 enum cxl_regloc_type {
60 CXL_REGLOC_RBI_EMPTY = 0,
61 CXL_REGLOC_RBI_COMPONENT,
62 CXL_REGLOC_RBI_VIRT,
63 CXL_REGLOC_RBI_MEMDEV,
64 CXL_REGLOC_RBI_TYPES
65 };
66
cxl_regmap_to_base(struct pci_dev * pdev,struct cxl_register_map * map)67 static inline resource_size_t cxl_regmap_to_base(struct pci_dev *pdev,
68 struct cxl_register_map *map)
69 {
70 if (map->block_offset == U64_MAX)
71 return CXL_RESOURCE_NONE;
72
73 return pci_resource_start(pdev, map->barno) + map->block_offset;
74 }
75
76 struct cdat_header {
77 __le32 length;
78 u8 revision;
79 u8 checksum;
80 u8 reserved[6];
81 __le32 sequence;
82 } __packed;
83
84 struct cdat_entry_header {
85 u8 type;
86 u8 reserved;
87 __le16 length;
88 } __packed;
89
90 int devm_cxl_port_enumerate_dports(struct cxl_port *port);
91 struct cxl_dev_state;
92 int cxl_hdm_decode_init(struct cxl_dev_state *cxlds, struct cxl_hdm *cxlhdm);
93 void read_cdat_data(struct cxl_port *port);
94 #endif /* __CXL_PCI_H__ */
95