sparc64: Add Niagara2 RNG driver.
With feedback and suggestions from Sam Ravnborg.
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/char/hw_random/n2rng.h b/drivers/char/hw_random/n2rng.h
new file mode 100644
index 0000000..a2b81e7
--- /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 */