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 <thomas.lendacky@amd.com>
  8 * Author: Gary R Hook <gary.hook@amd.com>
  9 * Author: Brijesh Singh <brijesh.singh@amd.com>
 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/* Structure to hold CCP device data */
 32struct ccp_device;
 33struct ccp_vdata {
 34	const unsigned int version;
 35	const unsigned int dma_chan_attr;
 36	void (*setup)(struct ccp_device *);
 37	const struct ccp_actions *perform;
 38	const unsigned int offset;
 39	const unsigned int rsamax;
 40};
 41
 42struct sev_vdata {
 43	const unsigned int cmdresp_reg;
 44	const unsigned int cmdbuff_addr_lo_reg;
 45	const unsigned int cmdbuff_addr_hi_reg;
 46};
 47
 48struct tee_vdata {
 49	const unsigned int cmdresp_reg;
 50	const unsigned int cmdbuff_addr_lo_reg;
 51	const unsigned int cmdbuff_addr_hi_reg;
 52	const unsigned int ring_wptr_reg;
 53	const unsigned int ring_rptr_reg;
 54};
 55
 56struct psp_vdata {
 57	const struct sev_vdata *sev;
 58	const struct tee_vdata *tee;
 59	const unsigned int feature_reg;
 60	const unsigned int inten_reg;
 61	const unsigned int intsts_reg;
 62};
 63
 64/* Structure to hold SP device data */
 65struct sp_dev_vdata {
 66	const unsigned int bar;
 67
 68	const struct ccp_vdata *ccp_vdata;
 69	const struct psp_vdata *psp_vdata;
 70};
 71
 72struct sp_device {
 73	struct list_head entry;
 74
 75	struct device *dev;
 76
 77	struct sp_dev_vdata *dev_vdata;
 78	unsigned int ord;
 79	char name[SP_MAX_NAME_LEN];
 80
 81	/* Bus specific device information */
 82	void *dev_specific;
 83
 84	/* I/O area used for device communication. */
 85	void __iomem *io_map;
 86
 87	/* DMA caching attribute support */
 88	unsigned int axcache;
 89
 90	/* get and set master device */
 91	struct sp_device*(*get_psp_master_device)(void);
 92	void (*set_psp_master_device)(struct sp_device *);
 93	void (*clear_psp_master_device)(struct sp_device *);
 94
 95	bool irq_registered;
 96	bool use_tasklet;
 97
 98	unsigned int ccp_irq;
 99	irq_handler_t ccp_irq_handler;
100	void *ccp_irq_data;
101
102	unsigned int psp_irq;
103	irq_handler_t psp_irq_handler;
104	void *psp_irq_data;
105
106	void *ccp_data;
107	void *psp_data;
108};
109
110int sp_pci_init(void);
111void sp_pci_exit(void);
112
113int sp_platform_init(void);
114void sp_platform_exit(void);
115
116struct sp_device *sp_alloc_struct(struct device *dev);
117
118int sp_init(struct sp_device *sp);
119void sp_destroy(struct sp_device *sp);
120struct sp_device *sp_get_master(void);
121
122int sp_suspend(struct sp_device *sp);
123int sp_resume(struct sp_device *sp);
124int sp_request_ccp_irq(struct sp_device *sp, irq_handler_t handler,
125		       const char *name, void *data);
126void sp_free_ccp_irq(struct sp_device *sp, void *data);
127int sp_request_psp_irq(struct sp_device *sp, irq_handler_t handler,
128		       const char *name, void *data);
129void sp_free_psp_irq(struct sp_device *sp, void *data);
130struct sp_device *sp_get_psp_master_device(void);
131
132#ifdef CONFIG_CRYPTO_DEV_SP_CCP
133
134int ccp_dev_init(struct sp_device *sp);
135void ccp_dev_destroy(struct sp_device *sp);
136
137int ccp_dev_suspend(struct sp_device *sp);
138int ccp_dev_resume(struct sp_device *sp);
139
140#else	/* !CONFIG_CRYPTO_DEV_SP_CCP */
141
142static inline int ccp_dev_init(struct sp_device *sp)
143{
144	return 0;
145}
146static inline void ccp_dev_destroy(struct sp_device *sp) { }
147
148static inline int ccp_dev_suspend(struct sp_device *sp)
149{
150	return 0;
151}
152static inline int ccp_dev_resume(struct sp_device *sp)
153{
154	return 0;
155}
156#endif	/* CONFIG_CRYPTO_DEV_SP_CCP */
157
158#ifdef CONFIG_CRYPTO_DEV_SP_PSP
159
160int psp_dev_init(struct sp_device *sp);
161void psp_pci_init(void);
162void psp_dev_destroy(struct sp_device *sp);
163void psp_pci_exit(void);
164
165#else /* !CONFIG_CRYPTO_DEV_SP_PSP */
166
167static inline int psp_dev_init(struct sp_device *sp) { return 0; }
168static inline void psp_pci_init(void) { }
169static inline void psp_dev_destroy(struct sp_device *sp) { }
170static inline void psp_pci_exit(void) { }
171
172#endif /* CONFIG_CRYPTO_DEV_SP_PSP */
173
174#endif