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 of_device        *op;
  69
  70         unsigned long           flags;
  71 #define N2RNG_FLAG_VF           0x00000001 /* Victoria Falls RNG, else N2 */
  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 */