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
calc_rtx(dma_addr_t ptr)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
calc_sx(dma_addr_t ptr)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
calc_px(dma_addr_t ptr)95 static inline unsigned int calc_px(dma_addr_t ptr)
96 {
97 return ((unsigned long) ptr >> PAGE_SHIFT) & ZPCI_PT_MASK;
98 }
99
set_pt_pfaa(unsigned long * entry,void * pfaa)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
set_rt_sto(unsigned long * entry,void * sto)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
set_st_pto(unsigned long * entry,void * pto)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
validate_rt_entry(unsigned long * entry)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
validate_st_entry(unsigned long * entry)128 static inline void validate_st_entry(unsigned long *entry)
129 {
130 *entry &= ~ZPCI_TABLE_VALID_MASK;
131 *entry |= ZPCI_TABLE_VALID;
132 }
133
invalidate_pt_entry(unsigned long * entry)134 static inline void invalidate_pt_entry(unsigned long *entry)
135 {
136 WARN_ON_ONCE((*entry & ZPCI_PTE_VALID_MASK) == ZPCI_PTE_INVALID);
137 *entry &= ~ZPCI_PTE_VALID_MASK;
138 *entry |= ZPCI_PTE_INVALID;
139 }
140
validate_pt_entry(unsigned long * entry)141 static inline void validate_pt_entry(unsigned long *entry)
142 {
143 WARN_ON_ONCE((*entry & ZPCI_PTE_VALID_MASK) == ZPCI_PTE_VALID);
144 *entry &= ~ZPCI_PTE_VALID_MASK;
145 *entry |= ZPCI_PTE_VALID;
146 }
147
entry_set_protected(unsigned long * entry)148 static inline void entry_set_protected(unsigned long *entry)
149 {
150 *entry &= ~ZPCI_TABLE_PROT_MASK;
151 *entry |= ZPCI_TABLE_PROTECTED;
152 }
153
entry_clr_protected(unsigned long * entry)154 static inline void entry_clr_protected(unsigned long *entry)
155 {
156 *entry &= ~ZPCI_TABLE_PROT_MASK;
157 *entry |= ZPCI_TABLE_UNPROTECTED;
158 }
159
reg_entry_isvalid(unsigned long entry)160 static inline int reg_entry_isvalid(unsigned long entry)
161 {
162 return (entry & ZPCI_TABLE_VALID_MASK) == ZPCI_TABLE_VALID;
163 }
164
pt_entry_isvalid(unsigned long entry)165 static inline int pt_entry_isvalid(unsigned long entry)
166 {
167 return (entry & ZPCI_PTE_VALID_MASK) == ZPCI_PTE_VALID;
168 }
169
get_rt_sto(unsigned long entry)170 static inline unsigned long *get_rt_sto(unsigned long entry)
171 {
172 return ((entry & ZPCI_TABLE_TYPE_MASK) == ZPCI_TABLE_TYPE_RTX)
173 ? (unsigned long *) (entry & ZPCI_RTE_ADDR_MASK)
174 : NULL;
175 }
176
get_st_pto(unsigned long entry)177 static inline unsigned long *get_st_pto(unsigned long entry)
178 {
179 return ((entry & ZPCI_TABLE_TYPE_MASK) == ZPCI_TABLE_TYPE_SX)
180 ? (unsigned long *) (entry & ZPCI_STE_ADDR_MASK)
181 : NULL;
182 }
183
184 /* Prototypes */
185 int zpci_dma_init_device(struct zpci_dev *);
186 void zpci_dma_exit_device(struct zpci_dev *);
187 void dma_free_seg_table(unsigned long);
188 unsigned long *dma_alloc_cpu_table(void);
189 void dma_cleanup_tables(unsigned long *);
190 unsigned long *dma_walk_cpu_trans(unsigned long *rto, dma_addr_t dma_addr);
191 void dma_update_cpu_trans(unsigned long *entry, void *page_addr, int flags);
192
193 extern const struct dma_map_ops s390_pci_dma_ops;
194
195
196 #endif
197
