LXR linux/drivers/char/hw

   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 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 */
 119