1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * Copyright (C) 2021 Western Digital Corporation or its affiliates.
4 * Copyright (C) 2022 Ventana Micro Systems Inc.
5 */
6 #ifndef __LINUX_IRQCHIP_RISCV_IMSIC_H
7 #define __LINUX_IRQCHIP_RISCV_IMSIC_H
8
9 #include <linux/types.h>
10 #include <linux/bitops.h>
11 #include <asm/csr.h>
12
13 #define IMSIC_MMIO_PAGE_SHIFT 12
14 #define IMSIC_MMIO_PAGE_SZ BIT(IMSIC_MMIO_PAGE_SHIFT)
15 #define IMSIC_MMIO_PAGE_LE 0x00
16 #define IMSIC_MMIO_PAGE_BE 0x04
17
18 #define IMSIC_MIN_ID 63
19 #define IMSIC_MAX_ID 2048
20
21 #define IMSIC_EIDELIVERY 0x70
22
23 #define IMSIC_EITHRESHOLD 0x72
24
25 #define IMSIC_EIP0 0x80
26 #define IMSIC_EIP63 0xbf
27 #define IMSIC_EIPx_BITS 32
28
29 #define IMSIC_EIE0 0xc0
30 #define IMSIC_EIE63 0xff
31 #define IMSIC_EIEx_BITS 32
32
33 #define IMSIC_FIRST IMSIC_EIDELIVERY
34 #define IMSIC_LAST IMSIC_EIE63
35
36 #define IMSIC_MMIO_SETIPNUM_LE 0x00
37 #define IMSIC_MMIO_SETIPNUM_BE 0x04
38
39 struct imsic_local_config {
40 phys_addr_t msi_pa;
41 void __iomem *msi_va;
42 };
43
44 struct imsic_global_config {
45 /*
46 * MSI Target Address Scheme
47 *
48 * XLEN-1 12 0
49 * | | |
50 * -------------------------------------------------------------
51 * |xxxxxx|Group Index|xxxxxxxxxxx|HART Index|Guest Index| 0 |
52 * -------------------------------------------------------------
53 */
54
55 /* Bits representing Guest index, HART index, and Group index */
56 u32 guest_index_bits;
57 u32 hart_index_bits;
58 u32 group_index_bits;
59 u32 group_index_shift;
60
61 /* Global base address matching all target MSI addresses */
62 phys_addr_t base_addr;
63
64 /* Number of interrupt identities */
65 u32 nr_ids;
66
67 /* Number of guest interrupt identities */
68 u32 nr_guest_ids;
69
70 /* Per-CPU IMSIC addresses */
71 struct imsic_local_config __percpu *local;
72 };
73
74 #ifdef CONFIG_RISCV_IMSIC
75
76 const struct imsic_global_config *imsic_get_global_config(void);
77
78 #else
79
80 static inline const struct imsic_global_config *imsic_get_global_config(void)
81 {
82 return NULL;
83 }
84
85 #endif
86
87 #endif
88
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