aboutsummaryrefslogtreecommitdiffstats
path: root/arch/s390/include/asm/pci_dma.h
blob: f62cd3ed2d443589f00620cecd27a0dd1c622be6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_S390_PCI_DMA_H
#define _ASM_S390_PCI_DMA_H

/* I/O Translation Anchor (IOTA) */
enum zpci_ioat_dtype {
	ZPCI_IOTA_STO = 0,
	ZPCI_IOTA_RTTO = 1,
	ZPCI_IOTA_RSTO = 2,
	ZPCI_IOTA_RFTO = 3,
	ZPCI_IOTA_PFAA = 4,
	ZPCI_IOTA_IOPFAA = 5,
	ZPCI_IOTA_IOPTO = 7
};

#define ZPCI_IOTA_IOT_ENABLED		0x800UL
#define ZPCI_IOTA_DT_ST			(ZPCI_IOTA_STO	<< 2)
#define ZPCI_IOTA_DT_RT			(ZPCI_IOTA_RTTO << 2)
#define ZPCI_IOTA_DT_RS			(ZPCI_IOTA_RSTO << 2)
#define ZPCI_IOTA_DT_RF			(ZPCI_IOTA_RFTO << 2)
#define ZPCI_IOTA_DT_PF			(ZPCI_IOTA_PFAA << 2)
#define ZPCI_IOTA_FS_4K			0
#define ZPCI_IOTA_FS_1M			1
#define ZPCI_IOTA_FS_2G			2
#define ZPCI_KEY			(PAGE_DEFAULT_KEY << 5)

#define ZPCI_TABLE_SIZE_RT	(1UL << 42)

#define ZPCI_IOTA_STO_FLAG	(ZPCI_IOTA_IOT_ENABLED | ZPCI_KEY | ZPCI_IOTA_DT_ST)
#define ZPCI_IOTA_RTTO_FLAG	(ZPCI_IOTA_IOT_ENABLED | ZPCI_KEY | ZPCI_IOTA_DT_RT)
#define ZPCI_IOTA_RSTO_FLAG	(ZPCI_IOTA_IOT_ENABLED | ZPCI_KEY | ZPCI_IOTA_DT_RS)
#define ZPCI_IOTA_RFTO_FLAG	(ZPCI_IOTA_IOT_ENABLED | ZPCI_KEY | ZPCI_IOTA_DT_RF)
#define ZPCI_IOTA_RFAA_FLAG	(ZPCI_IOTA_IOT_ENABLED | ZPCI_KEY | ZPCI_IOTA_DT_PF | ZPCI_IOTA_FS_2G)

/* I/O Region and segment tables */
#define ZPCI_INDEX_MASK			0x7ffUL

#define ZPCI_TABLE_TYPE_MASK		0xc
#define ZPCI_TABLE_TYPE_RFX		0xc
#define ZPCI_TABLE_TYPE_RSX		0x8
#define ZPCI_TABLE_TYPE_RTX		0x4
#define ZPCI_TABLE_TYPE_SX		0x0

#define ZPCI_TABLE_LEN_RFX		0x3
#define ZPCI_TABLE_LEN_RSX		0x3
#define ZPCI_TABLE_LEN_RTX		0x3

#define ZPCI_TABLE_OFFSET_MASK		0xc0
#define ZPCI_TABLE_SIZE			0x4000
#define ZPCI_TABLE_ALIGN		ZPCI_TABLE_SIZE
#define ZPCI_TABLE_ENTRY_SIZE		(sizeof(unsigned long))
#define ZPCI_TABLE_ENTRIES		(ZPCI_TABLE_SIZE / ZPCI_TABLE_ENTRY_SIZE)

#define ZPCI_TABLE_BITS			11
#define ZPCI_PT_BITS			8
#define ZPCI_ST_SHIFT			(ZPCI_PT_BITS + PAGE_SHIFT)
#define ZPCI_RT_SHIFT			(ZPCI_ST_SHIFT + ZPCI_TABLE_BITS)

#define ZPCI_RTE_FLAG_MASK		0x3fffUL
#define ZPCI_RTE_ADDR_MASK		(~ZPCI_RTE_FLAG_MASK)
#define ZPCI_STE_FLAG_MASK		0x7ffUL
#define ZPCI_STE_ADDR_MASK		(~ZPCI_STE_FLAG_MASK)

/* I/O Page tables */
#define ZPCI_PTE_VALID_MASK		0x400
#define ZPCI_PTE_INVALID		0x400
#define ZPCI_PTE_VALID			0x000
#define ZPCI_PT_SIZE			0x800
#define ZPCI_PT_ALIGN			ZPCI_PT_SIZE
#define ZPCI_PT_ENTRIES			(ZPCI_PT_SIZE / ZPCI_TABLE_ENTRY_SIZE)
#define ZPCI_PT_MASK			(ZPCI_PT_ENTRIES - 1)

#define ZPCI_PTE_FLAG_MASK		0xfffUL
#define ZPCI_PTE_ADDR_MASK		(~ZPCI_PTE_FLAG_MASK)

/* Shared bits */
#define ZPCI_TABLE_VALID		0x00
#define ZPCI_TABLE_INVALID		0x20
#define ZPCI_TABLE_PROTECTED		0x200
#define ZPCI_TABLE_UNPROTECTED		0x000

#define ZPCI_TABLE_VALID_MASK		0x20
#define ZPCI_TABLE_PROT_MASK		0x200

static inline unsigned int calc_rtx(dma_addr_t ptr)
{
	return ((unsigned long) ptr >> ZPCI_RT_SHIFT) & ZPCI_INDEX_MASK;
}

static inline unsigned int calc_sx(dma_addr_t ptr)
{
	return ((unsigned long) ptr >> ZPCI_ST_SHIFT) & ZPCI_INDEX_MASK;
}

static inline unsigned int calc_px(dma_addr_t ptr)
{
	return ((unsigned long) ptr >> PAGE_SHIFT) & ZPCI_PT_MASK;
}

static inline void set_pt_pfaa(unsigned long *entry, void *pfaa)
{
	*entry &= ZPCI_PTE_FLAG_MASK;
	*entry |= ((unsigned long) pfaa & ZPCI_PTE_ADDR_MASK);
}

static inline void set_rt_sto(unsigned long *entry, void *sto)
{
	*entry &= ZPCI_RTE_FLAG_MASK;
	*entry |= ((unsigned long) sto & ZPCI_RTE_ADDR_MASK);
	*entry |= ZPCI_TABLE_TYPE_RTX;
}

static inline void set_st_pto(unsigned long *entry, void *pto)
{
	*entry &= ZPCI_STE_FLAG_MASK;
	*entry |= ((unsigned long) pto & ZPCI_STE_ADDR_MASK);
	*entry |= ZPCI_TABLE_TYPE_SX;
}

static inline void validate_rt_entry(unsigned long *entry)
{
	*entry &= ~ZPCI_TABLE_VALID_MASK;
	*entry &= ~ZPCI_TABLE_OFFSET_MASK;
	*entry |= ZPCI_TABLE_VALID;
	*entry |= ZPCI_TABLE_LEN_RTX;
}

static inline void validate_st_entry(unsigned long *entry)
{
	*entry &= ~ZPCI_TABLE_VALID_MASK;
	*entry |= ZPCI_TABLE_VALID;
}

static inline void invalidate_pt_entry(unsigned long *entry)
{
	WARN_ON_ONCE((*entry & ZPCI_PTE_VALID_MASK) == ZPCI_PTE_INVALID);
	*entry &= ~ZPCI_PTE_VALID_MASK;
	*entry |= ZPCI_PTE_INVALID;
}

static inline void validate_pt_entry(unsigned long *entry)
{
	WARN_ON_ONCE((*entry & ZPCI_PTE_VALID_MASK) == ZPCI_PTE_VALID);
	*entry &= ~ZPCI_PTE_VALID_MASK;
	*entry |= ZPCI_PTE_VALID;
}

static inline void entry_set_protected(unsigned long *entry)
{
	*entry &= ~ZPCI_TABLE_PROT_MASK;
	*entry |= ZPCI_TABLE_PROTECTED;
}

static inline void entry_clr_protected(unsigned long *entry)
{
	*entry &= ~ZPCI_TABLE_PROT_MASK;
	*entry |= ZPCI_TABLE_UNPROTECTED;
}

static inline int reg_entry_isvalid(unsigned long entry)
{
	return (entry & ZPCI_TABLE_VALID_MASK) == ZPCI_TABLE_VALID;
}

static inline int pt_entry_isvalid(unsigned long entry)
{
	return (entry & ZPCI_PTE_VALID_MASK) == ZPCI_PTE_VALID;
}

static inline unsigned long *get_rt_sto(unsigned long entry)
{
	return ((entry & ZPCI_TABLE_TYPE_MASK) == ZPCI_TABLE_TYPE_RTX)
		? (unsigned long *) (entry & ZPCI_RTE_ADDR_MASK)
		: NULL;
}

static inline unsigned long *get_st_pto(unsigned long entry)
{
	return ((entry & ZPCI_TABLE_TYPE_MASK) == ZPCI_TABLE_TYPE_SX)
		? (unsigned long *) (entry & ZPCI_STE_ADDR_MASK)
		: NULL;
}

/* Prototypes */
int zpci_dma_init_device(struct zpci_dev *);
void zpci_dma_exit_device(struct zpci_dev *);
void dma_free_seg_table(unsigned long);
unsigned long *dma_alloc_cpu_table(void);
void dma_cleanup_tables(unsigned long *);
unsigned long *dma_walk_cpu_trans(unsigned long *rto, dma_addr_t dma_addr);
void dma_update_cpu_trans(unsigned long *entry, void *page_addr, int flags);

extern const struct dma_map_ops s390_pci_dma_ops;


#endif

Privacy Policy