1 /* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
2 #ifndef _UAPI_LINUX_FSI_H
3 #define _UAPI_LINUX_FSI_H
4
5 #include <linux/types.h>
6 #include <linux/ioctl.h>
7
8 /*
9 * /dev/scom "raw" ioctl interface
10 *
11 * The driver supports a high level "read/write" interface which
12 * handles retries and converts the status to Linux error codes,
13 * however low level tools an debugger need to access the "raw"
14 * HW status information and interpret it themselves, so this
15 * ioctl interface is also provided for their use case.
16 */
17
18 /* Structure for SCOM read/write */
19 struct scom_access {
20 __u64 addr; /* SCOM address, supports indirect */
21 __u64 data; /* SCOM data (in for write, out for read) */
22 __u64 mask; /* Data mask for writes */
23 __u32 intf_errors; /* Interface error flags */
24 #define SCOM_INTF_ERR_PARITY 0x00000001 /* Parity error */
25 #define SCOM_INTF_ERR_PROTECTION 0x00000002 /* Blocked by secure boot */
26 #define SCOM_INTF_ERR_ABORT 0x00000004 /* PIB reset during access */
27 #define SCOM_INTF_ERR_UNKNOWN 0x80000000 /* Unknown error */
28 /*
29 * Note: Any other bit set in intf_errors need to be considered as an
30 * error. Future implementations may define new error conditions. The
31 * pib_status below is only valid if intf_errors is 0.
32 */
33 __u8 pib_status; /* 3-bit PIB status */
34 #define SCOM_PIB_SUCCESS 0 /* Access successful */
35 #define SCOM_PIB_BLOCKED 1 /* PIB blocked, pls retry */
36 #define SCOM_PIB_OFFLINE 2 /* Chiplet offline */
37 #define SCOM_PIB_PARTIAL 3 /* Partial good */
38 #define SCOM_PIB_BAD_ADDR 4 /* Invalid address */
39 #define SCOM_PIB_CLK_ERR 5 /* Clock error */
40 #define SCOM_PIB_PARITY_ERR 6 /* Parity error on the PIB bus */
41 #define SCOM_PIB_TIMEOUT 7 /* Bus timeout */
42 __u8 pad;
43 };
44
45 /* Flags for SCOM check */
46 #define SCOM_CHECK_SUPPORTED 0x00000001 /* Interface supported */
47 #define SCOM_CHECK_PROTECTED 0x00000002 /* Interface blocked by secure boot */
48
49 /* Flags for SCOM reset */
50 #define SCOM_RESET_INTF 0x00000001 /* Reset interface */
51 #define SCOM_RESET_PIB 0x00000002 /* Reset PIB */
52
53 #define FSI_SCOM_CHECK _IOR('s', 0x00, __u32)
54 #define FSI_SCOM_READ _IOWR('s', 0x01, struct scom_access)
55 #define FSI_SCOM_WRITE _IOWR('s', 0x02, struct scom_access)
56 #define FSI_SCOM_RESET _IOW('s', 0x03, __u32)
57
58 #endif /* _UAPI_LINUX_FSI_H */