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 <linux/device.h>
12 #include <linux/fwnode.h>
13 #include <asm/csr.h>
14
15 #define IMSIC_MMIO_PAGE_SHIFT 12
16 #define IMSIC_MMIO_PAGE_SZ BIT(IMSIC_MMIO_PAGE_SHIFT)
17 #define IMSIC_MMIO_PAGE_LE 0x00
18 #define IMSIC_MMIO_PAGE_BE 0x04
19
20 #define IMSIC_MIN_ID 63
21 #define IMSIC_MAX_ID 2048
22
23 #define IMSIC_EIDELIVERY 0x70
24
25 #define IMSIC_EITHRESHOLD 0x72
26
27 #define IMSIC_EIP0 0x80
28 #define IMSIC_EIP63 0xbf
29 #define IMSIC_EIPx_BITS 32
30
31 #define IMSIC_EIE0 0xc0
32 #define IMSIC_EIE63 0xff
33 #define IMSIC_EIEx_BITS 32
34
35 #define IMSIC_FIRST IMSIC_EIDELIVERY
36 #define IMSIC_LAST IMSIC_EIE63
37
38 #define IMSIC_MMIO_SETIPNUM_LE 0x00
39 #define IMSIC_MMIO_SETIPNUM_BE 0x04
40
41 struct imsic_local_config {
42 phys_addr_t msi_pa;
43 void __iomem *msi_va;
44 };
45
46 struct imsic_global_config {
47 /*
48 * MSI Target Address Scheme
49 *
50 * XLEN-1 12 0
51 * | | |
52 * -------------------------------------------------------------
53 * |xxxxxx|Group Index|xxxxxxxxxxx|HART Index|Guest Index| 0 |
54 * -------------------------------------------------------------
55 */
56
57 /* Bits representing Guest index, HART index, and Group index */
58 u32 guest_index_bits;
59 u32 hart_index_bits;
60 u32 group_index_bits;
61 u32 group_index_shift;
62
63 /* Global base address matching all target MSI addresses */
64 phys_addr_t base_addr;
65
66 /* Number of interrupt identities */
67 u32 nr_ids;
68
69 /* Number of guest interrupt identities */
70 u32 nr_guest_ids;
71
72 /* Per-CPU IMSIC addresses */
73 struct imsic_local_config __percpu *local;
74 };
75
76 #ifdef CONFIG_RISCV_IMSIC
77
78 const struct imsic_global_config *imsic_get_global_config(void);
79
80 #else
81
82 static inline const struct imsic_global_config *imsic_get_global_config(void)
83 {
84 return NULL;
85 }
86
87 #endif
88
89 #ifdef CONFIG_ACPI
90 int imsic_platform_acpi_probe(struct fwnode_handle *fwnode);
91 struct fwnode_handle *imsic_acpi_get_fwnode(struct device *dev);
92 #else
93 static inline struct fwnode_handle *imsic_acpi_get_fwnode(struct device *dev) { return NULL; }
94 #endif
95
96 #endif
97
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