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 */
119