sparc64: Add Niagara2 RNG driver.

With feedback and suggestions from Sam Ravnborg.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 118 insertions, 0 deletions

diff --git a/drivers/char/hw_random/n2rng.h b/drivers/char/hw_random/n2rng.h
new file mode 100644
index 000000000000..a2b81e7bfc18
--- /dev/null
+++ b/drivers/char/hw_random/n2rng.h
@@ -0,0 +1,118 @@
+/* n2rng.h: Niagara2 RNG defines.
+ *
+ * Copyright (C) 2008 David S. Miller <davem@davemloft.net>
+ */
+
+#ifndef _N2RNG_H
+#define _N2RNG_H
+
+#define RNG_CTL_WAIT       0x0000000001fffe00ULL /* Minimum wait time       */
+#define RNG_CTL_WAIT_SHIFT 9
+#define RNG_CTL_BYPASS     0x0000000000000100ULL /* VCO voltage source      */
+#define RNG_CTL_VCO        0x00000000000000c0ULL /* VCO rate control        */
+#define RNG_CTL_VCO_SHIFT  6
+#define RNG_CTL_ASEL       0x0000000000000030ULL /* Analog MUX select       */
+#define RNG_CTL_ASEL_SHIFT 4
+#define RNG_CTL_LFSR       0x0000000000000008ULL /* Use LFSR or plain shift */
+#define RNG_CTL_ES3        0x0000000000000004ULL /* Enable entropy source 3 */
+#define RNG_CTL_ES2        0x0000000000000002ULL /* Enable entropy source 2 */
+#define RNG_CTL_ES1        0x0000000000000001ULL /* Enable entropy source 1 */
+
+#define HV_FAST_RNG_GET_DIAG_CTL        0x130
+#define HV_FAST_RNG_CTL_READ            0x131
+#define HV_FAST_RNG_CTL_WRITE           0x132
+#define HV_FAST_RNG_DATA_READ_DIAG      0x133
+#define HV_FAST_RNG_DATA_READ           0x134
+
+#define HV_RNG_STATE_UNCONFIGURED       0
+#define HV_RNG_STATE_CONFIGURED         1
+#define HV_RNG_STATE_HEALTHCHECK        2
+#define HV_RNG_STATE_ERROR              3
+
+#define HV_RNG_NUM_CONTROL              4
+
+#ifndef __ASSEMBLY__
+extern unsigned long sun4v_rng_get_diag_ctl(void);
+extern unsigned long sun4v_rng_ctl_read_v1(unsigned long ctl_regs_ra,
+                                           unsigned long *state,
+                                           unsigned long *tick_delta);
+extern unsigned long sun4v_rng_ctl_read_v2(unsigned long ctl_regs_ra,
+                                           unsigned long unit,
+                                           unsigned long *state,
+                                           unsigned long *tick_delta,
+                                           unsigned long *watchdog,
+                                           unsigned long *write_status);
+extern unsigned long sun4v_rng_ctl_write_v1(unsigned long ctl_regs_ra,
+                                            unsigned long state,
+                                            unsigned long write_timeout,
+                                            unsigned long *tick_delta);
+extern unsigned long sun4v_rng_ctl_write_v2(unsigned long ctl_regs_ra,
+                                            unsigned long state,
+                                            unsigned long write_timeout,
+                                            unsigned long unit);
+extern unsigned long sun4v_rng_data_read_diag_v1(unsigned long data_ra,
+                                                 unsigned long len,
+                                                 unsigned long *tick_delta);
+extern unsigned long sun4v_rng_data_read_diag_v2(unsigned long data_ra,
+                                                 unsigned long len,
+                                                 unsigned long unit,
+                                                 unsigned long *tick_delta);
+extern unsigned long sun4v_rng_data_read(unsigned long data_ra,
+                                         unsigned long *tick_delta);
+
+struct n2rng_unit {
+        u64                     control[HV_RNG_NUM_CONTROL];
+};
+
+struct n2rng {
+        struct of_device        *op;
+
+        unsigned long           flags;
+#define N2RNG_FLAG_VF           0x00000001 /* Victoria Falls RNG, else N2 */
+#define N2RNG_FLAG_CONTROL      0x00000002 /* Operating in control domain */
+#define N2RNG_FLAG_READY        0x00000008 /* Ready for hw-rng layer      */
+#define N2RNG_FLAG_SHUTDOWN     0x00000010 /* Driver unregistering        */
+#define N2RNG_FLAG_BUFFER_VALID 0x00000020 /* u32 buffer holds valid data */
+
+        int                     num_units;
+        struct n2rng_unit       *units;
+
+        struct hwrng            hwrng;
+        u32                     buffer;
+
+        /* Registered hypervisor group API major and minor version.  */
+        unsigned long           hvapi_major;
+        unsigned long           hvapi_minor;
+
+        struct delayed_work     work;
+
+        unsigned long           hv_state; /* HV_RNG_STATE_foo */
+
+        unsigned long           health_check_sec;
+        unsigned long           accum_cycles;
+        unsigned long           wd_timeo;
+#define N2RNG_HEALTH_CHECK_SEC_DEFAULT  0
+#define N2RNG_ACCUM_CYCLES_DEFAULT      2048
+#define N2RNG_WD_TIMEO_DEFAULT          0
+
+        u64                     scratch_control[HV_RNG_NUM_CONTROL];
+
+#define SELFTEST_TICKS          38859
+#define SELFTEST_VAL            ((u64)0xB8820C7BD387E32C)
+#define SELFTEST_POLY           ((u64)0x231DCEE91262B8A3)
+#define SELFTEST_MATCH_GOAL     6
+#define SELFTEST_LOOPS_MAX      40000
+#define SELFTEST_BUFFER_WORDS   8
+
+        u64                     test_data;
+        u64                     test_control[HV_RNG_NUM_CONTROL];
+        u64                     test_buffer[SELFTEST_BUFFER_WORDS];
+};
+
+#define N2RNG_BLOCK_LIMIT       60000
+#define N2RNG_BUSY_LIMIT        100
+#define N2RNG_HCHECK_LIMIT      100
+
+#endif /* !(__ASSEMBLY__) */
+
+#endif /* _N2RNG_H */