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[linux-2.6.git] / drivers / char / hw_random / n2rng.h
1 /* n2rng.h: Niagara2 RNG defines.
2  *
3  * Copyright (C) 2008 David S. Miller <davem@davemloft.net>
4  */
5
6 #ifndef _N2RNG_H
7 #define _N2RNG_H
8
9 #define RNG_CTL_WAIT       0x0000000001fffe00ULL /* Minimum wait time       */
10 #define RNG_CTL_WAIT_SHIFT 9
11 #define RNG_CTL_BYPASS     0x0000000000000100ULL /* VCO voltage source      */
12 #define RNG_CTL_VCO        0x00000000000000c0ULL /* VCO rate control        */
13 #define RNG_CTL_VCO_SHIFT  6
14 #define RNG_CTL_ASEL       0x0000000000000030ULL /* Analog MUX select       */
15 #define RNG_CTL_ASEL_SHIFT 4
16 #define RNG_CTL_LFSR       0x0000000000000008ULL /* Use LFSR or plain shift */
17 #define RNG_CTL_ES3        0x0000000000000004ULL /* Enable entropy source 3 */
18 #define RNG_CTL_ES2        0x0000000000000002ULL /* Enable entropy source 2 */
19 #define RNG_CTL_ES1        0x0000000000000001ULL /* Enable entropy source 1 */
20
21 #define HV_FAST_RNG_GET_DIAG_CTL        0x130
22 #define HV_FAST_RNG_CTL_READ            0x131
23 #define HV_FAST_RNG_CTL_WRITE           0x132
24 #define HV_FAST_RNG_DATA_READ_DIAG      0x133
25 #define HV_FAST_RNG_DATA_READ           0x134
26
27 #define HV_RNG_STATE_UNCONFIGURED       0
28 #define HV_RNG_STATE_CONFIGURED         1
29 #define HV_RNG_STATE_HEALTHCHECK        2
30 #define HV_RNG_STATE_ERROR              3
31
32 #define HV_RNG_NUM_CONTROL              4
33
34 #ifndef __ASSEMBLY__
35 extern unsigned long sun4v_rng_get_diag_ctl(void);
36 extern unsigned long sun4v_rng_ctl_read_v1(unsigned long ctl_regs_ra,
37                                            unsigned long *state,
38                                            unsigned long *tick_delta);
39 extern unsigned long sun4v_rng_ctl_read_v2(unsigned long ctl_regs_ra,
40                                            unsigned long unit,
41                                            unsigned long *state,
42                                            unsigned long *tick_delta,
43                                            unsigned long *watchdog,
44                                            unsigned long *write_status);
45 extern unsigned long sun4v_rng_ctl_write_v1(unsigned long ctl_regs_ra,
46                                             unsigned long state,
47                                             unsigned long write_timeout,
48                                             unsigned long *tick_delta);
49 extern unsigned long sun4v_rng_ctl_write_v2(unsigned long ctl_regs_ra,
50                                             unsigned long state,
51                                             unsigned long write_timeout,
52                                             unsigned long unit);
53 extern unsigned long sun4v_rng_data_read_diag_v1(unsigned long data_ra,
54                                                  unsigned long len,
55                                                  unsigned long *tick_delta);
56 extern unsigned long sun4v_rng_data_read_diag_v2(unsigned long data_ra,
57                                                  unsigned long len,
58                                                  unsigned long unit,
59                                                  unsigned long *tick_delta);
60 extern unsigned long sun4v_rng_data_read(unsigned long data_ra,
61                                          unsigned long *tick_delta);
62
63 struct n2rng_unit {
64         u64                     control[HV_RNG_NUM_CONTROL];
65 };
66
67 struct n2rng {
68         struct platform_device  *op;
69
70         unsigned long           flags;
71 #define N2RNG_FLAG_MULTI        0x00000001 /* Multi-unit capable RNG */
72 #define N2RNG_FLAG_CONTROL      0x00000002 /* Operating in control domain */
73 #define N2RNG_FLAG_READY        0x00000008 /* Ready for hw-rng layer      */
74 #define N2RNG_FLAG_SHUTDOWN     0x00000010 /* Driver unregistering        */
75 #define N2RNG_FLAG_BUFFER_VALID 0x00000020 /* u32 buffer holds valid data */
76
77         int                     num_units;
78         struct n2rng_unit       *units;
79
80         struct hwrng            hwrng;
81         u32                     buffer;
82
83         /* Registered hypervisor group API major and minor version.  */
84         unsigned long           hvapi_major;
85         unsigned long           hvapi_minor;
86
87         struct delayed_work     work;
88
89         unsigned long           hv_state; /* HV_RNG_STATE_foo */
90
91         unsigned long           health_check_sec;
92         unsigned long           accum_cycles;
93         unsigned long           wd_timeo;
94 #define N2RNG_HEALTH_CHECK_SEC_DEFAULT  0
95 #define N2RNG_ACCUM_CYCLES_DEFAULT      2048
96 #define N2RNG_WD_TIMEO_DEFAULT          0
97
98         u64                     scratch_control[HV_RNG_NUM_CONTROL];
99
100 #define SELFTEST_TICKS          38859
101 #define SELFTEST_VAL            ((u64)0xB8820C7BD387E32C)
102 #define SELFTEST_POLY           ((u64)0x231DCEE91262B8A3)
103 #define SELFTEST_MATCH_GOAL     6
104 #define SELFTEST_LOOPS_MAX      40000
105 #define SELFTEST_BUFFER_WORDS   8
106
107         u64                     test_data;
108         u64                     test_control[HV_RNG_NUM_CONTROL];
109         u64                     test_buffer[SELFTEST_BUFFER_WORDS];
110 };
111
112 #define N2RNG_BLOCK_LIMIT       60000
113 #define N2RNG_BUSY_LIMIT        100
114 #define N2RNG_HCHECK_LIMIT      100
115
116 #endif /* !(__ASSEMBLY__) */
117
118 #endif /* _N2RNG_H */