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1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * AMD Secure Processor driver
4 *
5 * Copyright (C) 2017-2019 Advanced Micro Devices, Inc.
6 *
7 * Author: Tom Lendacky <[email protected]>
8 * Author: Gary R Hook <[email protected]>
9 * Author: Brijesh Singh <[email protected]>
10 */
11
12#ifndef __SP_DEV_H__
13#define __SP_DEV_H__
14
15#include <linux/device.h>
16#include <linux/spinlock.h>
17#include <linux/mutex.h>
18#include <linux/list.h>
19#include <linux/wait.h>
20#include <linux/dmapool.h>
21#include <linux/hw_random.h>
22#include <linux/bitops.h>
23#include <linux/interrupt.h>
24#include <linux/irqreturn.h>
25
26#define SP_MAX_NAME_LEN 32
27
28#define CACHE_NONE 0x00
29#define CACHE_WB_NO_ALLOC 0xb7
30
31#define PLATFORM_FEATURE_DBC 0x1
32#define PLATFORM_FEATURE_HSTI 0x2
33
34#define PSP_FEATURE(psp, feat) (psp->vdata && psp->vdata->platform_features & PLATFORM_FEATURE_##feat)
35
36/* Structure to hold CCP device data */
37struct ccp_device;
38struct ccp_vdata {
39 const unsigned int version;
40 const unsigned int dma_chan_attr;
41 void (*setup)(struct ccp_device *);
42 const struct ccp_actions *perform;
43 const unsigned int offset;
44 const unsigned int rsamax;
45};
46
47struct sev_vdata {
48 const unsigned int cmdresp_reg;
49 const unsigned int cmdbuff_addr_lo_reg;
50 const unsigned int cmdbuff_addr_hi_reg;
51};
52
53struct tee_vdata {
54 const unsigned int cmdresp_reg;
55 const unsigned int cmdbuff_addr_lo_reg;
56 const unsigned int cmdbuff_addr_hi_reg;
57 const unsigned int ring_wptr_reg;
58 const unsigned int ring_rptr_reg;
59 const unsigned int info_reg;
60};
61
62struct platform_access_vdata {
63 const unsigned int cmdresp_reg;
64 const unsigned int cmdbuff_addr_lo_reg;
65 const unsigned int cmdbuff_addr_hi_reg;
66 const unsigned int doorbell_button_reg;
67 const unsigned int doorbell_cmd_reg;
68
69};
70
71struct psp_vdata {
72 const struct sev_vdata *sev;
73 const struct tee_vdata *tee;
74 const struct platform_access_vdata *platform_access;
75 const unsigned int cmdresp_reg;
76 const unsigned int cmdbuff_addr_lo_reg;
77 const unsigned int cmdbuff_addr_hi_reg;
78 const unsigned int feature_reg;
79 const unsigned int inten_reg;
80 const unsigned int intsts_reg;
81 const unsigned int bootloader_info_reg;
82 const unsigned int platform_features;
83};
84
85/* Structure to hold SP device data */
86struct sp_dev_vdata {
87 const unsigned int bar;
88
89 const struct ccp_vdata *ccp_vdata;
90 const struct psp_vdata *psp_vdata;
91};
92
93struct sp_device {
94 struct list_head entry;
95
96 struct device *dev;
97
98 const struct sp_dev_vdata *dev_vdata;
99 unsigned int ord;
100 char name[SP_MAX_NAME_LEN];
101
102 /* Bus specific device information */
103 void *dev_specific;
104
105 /* I/O area used for device communication. */
106 void __iomem *io_map;
107
108 /* DMA caching attribute support */
109 unsigned int axcache;
110
111 /* get and set master device */
112 struct sp_device*(*get_psp_master_device)(void);
113 void (*set_psp_master_device)(struct sp_device *);
114 void (*clear_psp_master_device)(struct sp_device *);
115
116 bool irq_registered;
117 bool use_tasklet;
118
119 unsigned int ccp_irq;
120 irq_handler_t ccp_irq_handler;
121 void *ccp_irq_data;
122
123 unsigned int psp_irq;
124 irq_handler_t psp_irq_handler;
125 void *psp_irq_data;
126
127 void *ccp_data;
128 void *psp_data;
129};
130
131int sp_pci_init(void);
132void sp_pci_exit(void);
133
134int sp_platform_init(void);
135void sp_platform_exit(void);
136
137struct sp_device *sp_alloc_struct(struct device *dev);
138
139int sp_init(struct sp_device *sp);
140void sp_destroy(struct sp_device *sp);
141
142int sp_suspend(struct sp_device *sp);
143int sp_resume(struct sp_device *sp);
144int sp_restore(struct sp_device *sp);
145int sp_request_ccp_irq(struct sp_device *sp, irq_handler_t handler,
146 const char *name, void *data);
147void sp_free_ccp_irq(struct sp_device *sp, void *data);
148int sp_request_psp_irq(struct sp_device *sp, irq_handler_t handler,
149 const char *name, void *data);
150void sp_free_psp_irq(struct sp_device *sp, void *data);
151struct sp_device *sp_get_psp_master_device(void);
152
153#ifdef CONFIG_CRYPTO_DEV_SP_CCP
154
155int ccp_dev_init(struct sp_device *sp);
156void ccp_dev_destroy(struct sp_device *sp);
157
158void ccp_dev_suspend(struct sp_device *sp);
159void ccp_dev_resume(struct sp_device *sp);
160
161#else /* !CONFIG_CRYPTO_DEV_SP_CCP */
162
163static inline int ccp_dev_init(struct sp_device *sp)
164{
165 return 0;
166}
167static inline void ccp_dev_destroy(struct sp_device *sp) { }
168static inline void ccp_dev_suspend(struct sp_device *sp) { }
169static inline void ccp_dev_resume(struct sp_device *sp) { }
170#endif /* CONFIG_CRYPTO_DEV_SP_CCP */
171
172#ifdef CONFIG_CRYPTO_DEV_SP_PSP
173
174int psp_dev_init(struct sp_device *sp);
175void psp_pci_init(void);
176void psp_dev_destroy(struct sp_device *sp);
177void psp_pci_exit(void);
178int psp_restore(struct sp_device *sp);
179
180#else /* !CONFIG_CRYPTO_DEV_SP_PSP */
181
182static inline int psp_dev_init(struct sp_device *sp) { return 0; }
183static inline void psp_pci_init(void) { }
184static inline void psp_dev_destroy(struct sp_device *sp) { }
185static inline void psp_pci_exit(void) { }
186static inline int psp_restore(struct sp_device *sp) { return 0; }
187
188#endif /* CONFIG_CRYPTO_DEV_SP_PSP */
189
190#endif