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 #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 */ 37 struct ccp_device; 38 struct 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 47 struct 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 53 struct 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 62 struct 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 71 struct 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 */ 86 struct 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 93 struct sp_device { 94 struct list_head entry; 95 96 struct device *dev; 97 98 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 }; 130 131 int sp_pci_init(void); 132 void sp_pci_exit(void); 133 134 int sp_platform_init(void); 135 void sp_platform_exit(void); 136 137 struct sp_device *sp_alloc_struct(struct device *dev); 138 139 int sp_init(struct sp_device *sp); 140 void sp_destroy(struct sp_device *sp); 141 142 int sp_suspend(struct sp_device *sp); 143 int sp_resume(struct sp_device *sp); 144 int sp_request_ccp_irq(struct sp_device *sp, irq_handler_t handler, 145 const char *name, void *data); 146 void sp_free_ccp_irq(struct sp_device *sp, void *data); 147 int sp_request_psp_irq(struct sp_device *sp, irq_handler_t handler, 148 const char *name, void *data); 149 void sp_free_psp_irq(struct sp_device *sp, void *data); 150 struct sp_device *sp_get_psp_master_device(void); 151 152 #ifdef CONFIG_CRYPTO_DEV_SP_CCP 153 154 int ccp_dev_init(struct sp_device *sp); 155 void ccp_dev_destroy(struct sp_device *sp); 156 157 void ccp_dev_suspend(struct sp_device *sp); 158 void ccp_dev_resume(struct sp_device *sp); 159 160 #else /* !CONFIG_CRYPTO_DEV_SP_CCP */ 161 ccp_dev_init(struct sp_device * sp)162 static inline int ccp_dev_init(struct sp_device *sp) 163 { 164 return 0; 165 } ccp_dev_destroy(struct sp_device * sp)166 static inline void ccp_dev_destroy(struct sp_device *sp) { } ccp_dev_suspend(struct sp_device * sp)167 static inline void ccp_dev_suspend(struct sp_device *sp) { } ccp_dev_resume(struct sp_device * sp)168 static inline void ccp_dev_resume(struct sp_device *sp) { } 169 #endif /* CONFIG_CRYPTO_DEV_SP_CCP */ 170 171 #ifdef CONFIG_CRYPTO_DEV_SP_PSP 172 173 int psp_dev_init(struct sp_device *sp); 174 void psp_pci_init(void); 175 void psp_dev_destroy(struct sp_device *sp); 176 void psp_pci_exit(void); 177 178 #else /* !CONFIG_CRYPTO_DEV_SP_PSP */ 179 psp_dev_init(struct sp_device * sp)180 static inline int psp_dev_init(struct sp_device *sp) { return 0; } psp_pci_init(void)181 static inline void psp_pci_init(void) { } psp_dev_destroy(struct sp_device * sp)182 static inline void psp_dev_destroy(struct sp_device *sp) { } psp_pci_exit(void)183 static inline void psp_pci_exit(void) { } 184 185 #endif /* CONFIG_CRYPTO_DEV_SP_PSP */ 186 187 #endif 188