56 #define	RNG_CTRL		0x00		/* RNG Control Register */
67 #define	RNG_RBGEN_BIT		0x00000001	/*  Enable RNG bit */
69 #define	BCM2835_RNG_STATUS	0x04		/* BCM2835 RNG status register */
70 #define	BCM2838_RNG_STATUS	0x18		/* BCM2838 RNG status register */
77 #define	BCM2835_RND_VAL_WARM_CNT	0x40000		/*  RNG Warm Up count */
78 #define	BCM2835_RND_WARM_CNT	0xfffff		/*  RNG Warm Up Count mask */
80 #define	BCM2835_RNG_DATA	0x08		/* RNG Data Register */
153 	{"broadcom,bcm2835-rng",	(uintptr_t)&bcm2835_rng_conf},
154 	{"brcm,bcm2835-rng",		(uintptr_t)&bcm2835_rng_conf},
156 	{"brcm,bcm2711-rng200",		(uintptr_t)&bcm2838_rng_conf},
157 	{"brcm,bcm2838-rng",		(uintptr_t)&bcm2838_rng_conf},
158 	{"brcm,bcm2838-rng200",		(uintptr_t)&bcm2838_rng_conf},
159 	{"brcm,bcm7211-rng",		(uintptr_t)&bcm2838_rng_conf},
160 	{"brcm,bcm7278-rng",		(uintptr_t)&bcm2838_rng_conf},
161 	{"brcm,iproc-rng200",		(uintptr_t)&bcm2838_rng_conf},
169 	atomic_add_long(&sc->sc_underrun, 1);  in bcm2835_rng_stat_inc_underrun()
176 	return bus_read_4(sc->sc_mem_res, off);  in bcm2835_rng_read4()
184 	bus_read_multi_4(sc->sc_mem_res, off, datap, count);  in bcm2835_rng_read_multi4()
191 	bus_write_4(sc->sc_mem_res, off, val);  in bcm2835_rng_write4()
200 	if (!sc->conf->can_diagnose)  in bcm2835_rng_dump_registers()
204 	/* Display RNG control register contents */  in bcm2835_rng_dump_registers()
205 	val = bcm2835_rng_read4(sc, sc->conf->control_reg);  in bcm2835_rng_dump_registers()
228 	    "Use RNG clock (APB clock)");  in bcm2835_rng_dump_registers()
235 		sbuf_cat(sbp, "  RNG_RBG2X: RNG 2X SPEED enabled\n");  in bcm2835_rng_dump_registers()
240 	/* Display RNG status register contents */  in bcm2835_rng_dump_registers()
241 	val = bcm2835_rng_read4(sc, sc->conf->status_reg);  in bcm2835_rng_dump_registers()
244 	    (val >> sc->conf->count_value_shift) & sc->conf->count_value_mask);  in bcm2835_rng_dump_registers()
245 	sbuf_printf(sbp, "  RND_WARM_CNT: %05x\n", val & sc->conf->warmup_count);  in bcm2835_rng_dump_registers()
252 	val = bcm2835_rng_read4(sc, sc->conf->intr_mask_reg);  in bcm2835_rng_dump_registers()
254 	     ((val & sc->conf->intr_disable_bit) != 0) ? "disabled" : "enabled");  in bcm2835_rng_dump_registers()
263 	mask = bcm2835_rng_read4(sc, sc->conf->intr_mask_reg);  in bcm2835_rng_disable_intr()
264 	mask |= sc->conf->intr_disable_bit;  in bcm2835_rng_disable_intr()
265 	bcm2835_rng_write4(sc, sc->conf->intr_mask_reg, mask);  in bcm2835_rng_disable_intr()
274 	if (sc->conf->intr_mask_reg)  in bcm2835_rng_start()
278 	if (sc->conf->warmup_count > 0)  in bcm2835_rng_start()
279 	    bcm2835_rng_write4(sc, sc->conf->status_reg,  in bcm2835_rng_start()
280 		    sc->conf->warmup_count);  in bcm2835_rng_start()
282 	/* Enable the RNG */  in bcm2835_rng_start()
283 	ctrl = bcm2835_rng_read4(sc, sc->conf->control_reg);  in bcm2835_rng_start()
285 	if (sc->sc_rbg2x && sc->conf->allow_2x_mode)  in bcm2835_rng_start()
287 	bcm2835_rng_write4(sc, sc->conf->control_reg, ctrl);  in bcm2835_rng_start()
295 	/* Disable the RNG */  in bcm2835_rng_stop()
296 	ctrl = bcm2835_rng_read4(sc, sc->conf->control_reg);  in bcm2835_rng_stop()
298 	bcm2835_rng_write4(sc, sc->conf->control_reg, ctrl);  in bcm2835_rng_stop()
308 	chunk_size = sizeof(((struct harvest_event *)0)->he_entropy);  in bcm2835_rng_enqueue_harvest()
310 	sc_buf_chunk = (void*)sc->sc_buf;  in bcm2835_rng_enqueue_harvest()
320 		cnt -= size;  in bcm2835_rng_enqueue_harvest()
333 	dest = sc->sc_buf;  in bcm2835_rng_harvest()
337 	for (cnt = sizeof(sc->sc_buf) / sizeof(uint32_t); cnt > 0;  in bcm2835_rng_harvest()
338 	    cnt -= num_words) {  in bcm2835_rng_harvest()
340 		hwcount = bcm2835_rng_read4(sc, sc->conf->count_reg);  in bcm2835_rng_harvest()
341 		num_avail = (hwcount >> sc->conf->count_value_shift) &  in bcm2835_rng_harvest()
342 		    sc->conf->count_value_mask;  in bcm2835_rng_harvest()
347 			if (++seen_underrun >= sc->sc_stall_count) {  in bcm2835_rng_harvest()
349 					device_printf(sc->sc_dev,  in bcm2835_rng_harvest()
350 					    "RNG stalled, disabling device\n");  in bcm2835_rng_harvest()
354 					device_printf(sc->sc_dev,  in bcm2835_rng_harvest()
365 		CTR2(KTR_DEV, "%s: %d words available in RNG FIFO",  in bcm2835_rng_harvest()
366 		    device_get_nameunit(sc->sc_dev), num_avail);  in bcm2835_rng_harvest()
370 		bcm2835_rng_read_multi4(sc, sc->conf->data_reg, dest,  in bcm2835_rng_harvest()
378 	callout_reset(&sc->sc_rngto, RNG_CALLOUT_TICKS, bcm2835_rng_harvest, sc);  in bcm2835_rng_harvest()
387 	rbg2x = sc->sc_rbg2x;  in sysctl_bcm2835_rng_2xspeed()
391 	if (req->newptr == NULL)  in sysctl_bcm2835_rng_2xspeed()
393 	if (rbg2x == sc->sc_rbg2x)  in sysctl_bcm2835_rng_2xspeed()
396 	/* Reset the RNG */  in sysctl_bcm2835_rng_2xspeed()
398 	sc->sc_rbg2x = rbg2x;  in sysctl_bcm2835_rng_2xspeed()
430 	if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)  in bcm2835_rng_probe()
433 	device_set_desc(dev, "Broadcom BCM2835/BCM2838 RNG");  in bcm2835_rng_probe()
448 	sc->sc_dev = dev;  in bcm2835_rng_attach()
450 	sc->conf = (void const*)ofw_bus_search_compatible(dev, compat_data)->ocd_data;  in bcm2835_rng_attach()
451 	KASSERT(sc->conf != NULL, ("bcm2835_rng_attach: sc->conf == NULL"));  in bcm2835_rng_attach()
453 	sc->sc_stall_count = RNG_STALL_COUNT_DEFAULT;  in bcm2835_rng_attach()
456 	callout_init(&sc->sc_rngto, CALLOUT_MPSAFE);  in bcm2835_rng_attach()
458 	TUNABLE_INT_FETCH("bcmrng.stall_count", &sc->sc_stall_count);  in bcm2835_rng_attach()
459 	if (sc->conf->allow_2x_mode)  in bcm2835_rng_attach()
460 	    TUNABLE_INT_FETCH("bcmrng.2xspeed", &sc->sc_rbg2x);  in bcm2835_rng_attach()
464 	sc->sc_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,  in bcm2835_rng_attach()
466 	if (sc->sc_mem_res == NULL) {  in bcm2835_rng_attach()
471 	/* Start the RNG */  in bcm2835_rng_attach()
491 	    "underrun", CTLFLAG_RD, &sc->sc_underrun,  in bcm2835_rng_attach()
493 	if (sc->conf->allow_2x_mode)  in bcm2835_rng_attach()
498 	    "stall_count", CTLFLAG_RW, &sc->sc_stall_count,  in bcm2835_rng_attach()
499 	    RNG_STALL_COUNT_DEFAULT, "Number of underruns to assume RNG stall");  in bcm2835_rng_attach()
503 	    sysctl_bcm2835_rng_dump, "S", "Dump RNG registers");  in bcm2835_rng_attach()
508 	 * hardware RNG plenty of time to generate the first random bytes.  in bcm2835_rng_attach()
510 	callout_reset(&sc->sc_rngto, hz, bcm2835_rng_harvest, sc);  in bcm2835_rng_attach()
522 	/* Stop the RNG */  in bcm2835_rng_detach()
526 	callout_drain(&sc->sc_rngto);  in bcm2835_rng_detach()
529 	if (sc->sc_mem_res != NULL)  in bcm2835_rng_detach()
530 		bus_release_resource(dev, SYS_RES_MEMORY, 0, sc->sc_mem_res);  in bcm2835_rng_detach()