arch/s390/include/asm/pci_dma.h

   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 #endif