n2rng.h revision 24f146696184cbe4b440179064a45dfddaad4cc4 
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__
35extern unsigned long sun4v_rng_get_diag_ctl(void);
36extern unsigned long sun4v_rng_ctl_read_v1(unsigned long ctl_regs_ra,
37					   unsigned long *state,
38					   unsigned long *tick_delta);
39extern 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);
45extern 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);
49extern 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);
53extern unsigned long sun4v_rng_data_read_diag_v1(unsigned long data_ra,
54						 unsigned long len,
55						 unsigned long *tick_delta);
56extern 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);
60extern unsigned long sun4v_rng_data_read(unsigned long data_ra,
61					 unsigned long *tick_delta);
62
63struct n2rng_unit {
64	u64			control[HV_RNG_NUM_CONTROL];
65};
66
67struct 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 */
119