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