1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _ASM_S390_PCI_DMA_H 3 #define _ASM_S390_PCI_DMA_H 4 5 /* I/O Translation Anchor (IOTA) */ 6 enum zpci_ioat_dtype { 7 ZPCI_IOTA_STO = 0, 8 ZPCI_IOTA_RTTO = 1, 9 ZPCI_IOTA_RSTO = 2, 10 ZPCI_IOTA_RFTO = 3, 11 ZPCI_IOTA_PFAA = 4, 12 ZPCI_IOTA_IOPFAA = 5, 13 ZPCI_IOTA_IOPTO = 7 14 }; 15 16 #define ZPCI_IOTA_IOT_ENABLED 0x800UL 17 #define ZPCI_IOTA_DT_ST (ZPCI_IOTA_STO << 2) 18 #define ZPCI_IOTA_DT_RT (ZPCI_IOTA_RTTO << 2) 19 #define ZPCI_IOTA_DT_RS (ZPCI_IOTA_RSTO << 2) 20 #define ZPCI_IOTA_DT_RF (ZPCI_IOTA_RFTO << 2) 21 #define ZPCI_IOTA_DT_PF (ZPCI_IOTA_PFAA << 2) 22 #define ZPCI_IOTA_FS_4K 0 23 #define ZPCI_IOTA_FS_1M 1 24 #define ZPCI_IOTA_FS_2G 2 25 #define ZPCI_KEY (PAGE_DEFAULT_KEY << 5) 26 27 #define ZPCI_TABLE_SIZE_RT (1UL << 42) 28 29 #define ZPCI_IOTA_STO_FLAG (ZPCI_IOTA_IOT_ENABLED | ZPCI_KEY | ZPCI_IOTA_DT_ST) 30 #define ZPCI_IOTA_RTTO_FLAG (ZPCI_IOTA_IOT_ENABLED | ZPCI_KEY | ZPCI_IOTA_DT_RT) 31 #define ZPCI_IOTA_RSTO_FLAG (ZPCI_IOTA_IOT_ENABLED | ZPCI_KEY | ZPCI_IOTA_DT_RS) 32 #define ZPCI_IOTA_RFTO_FLAG (ZPCI_IOTA_IOT_ENABLED | ZPCI_KEY | ZPCI_IOTA_DT_RF) 33 #define ZPCI_IOTA_RFAA_FLAG (ZPCI_IOTA_IOT_ENABLED | ZPCI_KEY | ZPCI_IOTA_DT_PF | ZPCI_IOTA_FS_2G) 34 35 /* I/O Region and segment tables */ 36 #define ZPCI_INDEX_MASK 0x7ffUL 37 38 #define ZPCI_TABLE_TYPE_MASK 0xc 39 #define ZPCI_TABLE_TYPE_RFX 0xc 40 #define ZPCI_TABLE_TYPE_RSX 0x8 41 #define ZPCI_TABLE_TYPE_RTX 0x4 42 #define ZPCI_TABLE_TYPE_SX 0x0 43 44 #define ZPCI_TABLE_LEN_RFX 0x3 45 #define ZPCI_TABLE_LEN_RSX 0x3 46 #define ZPCI_TABLE_LEN_RTX 0x3 47 48 #define ZPCI_TABLE_OFFSET_MASK 0xc0 49 #define ZPCI_TABLE_SIZE 0x4000 50 #define ZPCI_TABLE_ALIGN ZPCI_TABLE_SIZE 51 #define ZPCI_TABLE_ENTRY_SIZE (sizeof(unsigned long)) 52 #define ZPCI_TABLE_ENTRIES (ZPCI_TABLE_SIZE / ZPCI_TABLE_ENTRY_SIZE) 53 54 #define ZPCI_TABLE_BITS 11 55 #define ZPCI_PT_BITS 8 56 #define ZPCI_ST_SHIFT (ZPCI_PT_BITS + PAGE_SHIFT) 57 #define ZPCI_RT_SHIFT (ZPCI_ST_SHIFT + ZPCI_TABLE_BITS) 58 59 #define ZPCI_RTE_FLAG_MASK 0x3fffUL 60 #define ZPCI_RTE_ADDR_MASK (~ZPCI_RTE_FLAG_MASK) 61 #define ZPCI_STE_FLAG_MASK 0x7ffUL 62 #define ZPCI_STE_ADDR_MASK (~ZPCI_STE_FLAG_MASK) 63 64 /* I/O Page tables */ 65 #define ZPCI_PTE_VALID_MASK 0x400 66 #define ZPCI_PTE_INVALID 0x400 67 #define ZPCI_PTE_VALID 0x000 68 #define ZPCI_PT_SIZE 0x800 69 #define ZPCI_PT_ALIGN ZPCI_PT_SIZE 70 #define ZPCI_PT_ENTRIES (ZPCI_PT_SIZE / ZPCI_TABLE_ENTRY_SIZE) 71 #define ZPCI_PT_MASK (ZPCI_PT_ENTRIES - 1) 72 73 #define ZPCI_PTE_FLAG_MASK 0xfffUL 74 #define ZPCI_PTE_ADDR_MASK (~ZPCI_PTE_FLAG_MASK) 75 76 /* Shared bits */ 77 #define ZPCI_TABLE_VALID 0x00 78 #define ZPCI_TABLE_INVALID 0x20 79 #define ZPCI_TABLE_PROTECTED 0x200 80 #define ZPCI_TABLE_UNPROTECTED 0x000 81 82 #define ZPCI_TABLE_VALID_MASK 0x20 83 #define ZPCI_TABLE_PROT_MASK 0x200 84 85 static inline unsigned int calc_rtx(dma_addr_t ptr) 86 { 87 return ((unsigned long) ptr >> ZPCI_RT_SHIFT) & ZPCI_INDEX_MASK; 88 } 89 90 static inline unsigned int calc_sx(dma_addr_t ptr) 91 { 92 return ((unsigned long) ptr >> ZPCI_ST_SHIFT) & ZPCI_INDEX_MASK; 93 } 94 95 static inline unsigned int calc_px(dma_addr_t ptr) 96 { 97 return ((unsigned long) ptr >> PAGE_SHIFT) & ZPCI_PT_MASK; 98 } 99 100 static inline void set_pt_pfaa(unsigned long *entry, void *pfaa) 101 { 102 *entry &= ZPCI_PTE_FLAG_MASK; 103 *entry |= ((unsigned long) pfaa & ZPCI_PTE_ADDR_MASK); 104 } 105 106 static inline void set_rt_sto(unsigned long *entry, void *sto) 107 { 108 *entry &= ZPCI_RTE_FLAG_MASK; 109 *entry |= ((unsigned long) sto & ZPCI_RTE_ADDR_MASK); 110 *entry |= ZPCI_TABLE_TYPE_RTX; 111 } 112 113 static inline void set_st_pto(unsigned long *entry, void *pto) 114 { 115 *entry &= ZPCI_STE_FLAG_MASK; 116 *entry |= ((unsigned long) pto & ZPCI_STE_ADDR_MASK); 117 *entry |= ZPCI_TABLE_TYPE_SX; 118 } 119 120 static inline void validate_rt_entry(unsigned long *entry) 121 { 122 *entry &= ~ZPCI_TABLE_VALID_MASK; 123 *entry &= ~ZPCI_TABLE_OFFSET_MASK; 124 *entry |= ZPCI_TABLE_VALID; 125 *entry |= ZPCI_TABLE_LEN_RTX; 126 } 127 128 static inline void validate_st_entry(unsigned long *entry) 129 { 130 *entry &= ~ZPCI_TABLE_VALID_MASK; 131 *entry |= ZPCI_TABLE_VALID; 132 } 133 134 static inline void invalidate_table_entry(unsigned long *entry) 135 { 136 *entry &= ~ZPCI_TABLE_VALID_MASK; 137 *entry |= ZPCI_TABLE_INVALID; 138 } 139 140 static inline void invalidate_pt_entry(unsigned long *entry) 141 { 142 WARN_ON_ONCE((*entry & ZPCI_PTE_VALID_MASK) == ZPCI_PTE_INVALID); 143 *entry &= ~ZPCI_PTE_VALID_MASK; 144 *entry |= ZPCI_PTE_INVALID; 145 } 146 147 static inline void validate_pt_entry(unsigned long *entry) 148 { 149 WARN_ON_ONCE((*entry & ZPCI_PTE_VALID_MASK) == ZPCI_PTE_VALID); 150 *entry &= ~ZPCI_PTE_VALID_MASK; 151 *entry |= ZPCI_PTE_VALID; 152 } 153 154 static inline void entry_set_protected(unsigned long *entry) 155 { 156 *entry &= ~ZPCI_TABLE_PROT_MASK; 157 *entry |= ZPCI_TABLE_PROTECTED; 158 } 159 160 static inline void entry_clr_protected(unsigned long *entry) 161 { 162 *entry &= ~ZPCI_TABLE_PROT_MASK; 163 *entry |= ZPCI_TABLE_UNPROTECTED; 164 } 165 166 static inline int reg_entry_isvalid(unsigned long entry) 167 { 168 return (entry & ZPCI_TABLE_VALID_MASK) == ZPCI_TABLE_VALID; 169 } 170 171 static inline int pt_entry_isvalid(unsigned long entry) 172 { 173 return (entry & ZPCI_PTE_VALID_MASK) == ZPCI_PTE_VALID; 174 } 175 176 static inline int entry_isprotected(unsigned long entry) 177 { 178 return (entry & ZPCI_TABLE_PROT_MASK) == ZPCI_TABLE_PROTECTED; 179 } 180 181 static inline unsigned long *get_rt_sto(unsigned long entry) 182 { 183 return ((entry & ZPCI_TABLE_TYPE_MASK) == ZPCI_TABLE_TYPE_RTX) 184 ? (unsigned long *) (entry & ZPCI_RTE_ADDR_MASK) 185 : NULL; 186 } 187 188 static inline unsigned long *get_st_pto(unsigned long entry) 189 { 190 return ((entry & ZPCI_TABLE_TYPE_MASK) == ZPCI_TABLE_TYPE_SX) 191 ? (unsigned long *) (entry & ZPCI_STE_ADDR_MASK) 192 : NULL; 193 } 194 195 /* Prototypes */ 196 int zpci_dma_init_device(struct zpci_dev *); 197 void zpci_dma_exit_device(struct zpci_dev *); 198 void dma_free_seg_table(unsigned long); 199 unsigned long *dma_alloc_cpu_table(void); 200 void dma_cleanup_tables(unsigned long *); 201 unsigned long *dma_walk_cpu_trans(unsigned long *rto, dma_addr_t dma_addr); 202 void dma_update_cpu_trans(unsigned long *entry, void *page_addr, int flags); 203 204 extern const struct dma_map_ops s390_pci_dma_ops; 205 206 207 #endif 208