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[src/trunk]: src/sys/arch/arm/omap Add driver for AM335x TRNG module.
details: https://anonhg.NetBSD.org/src/rev/04c95096ddcd
branches: trunk
changeset: 808880:04c95096ddcd
user: jmcneill <jmcneill%NetBSD.org@localhost>
date: Sat Jun 06 14:00:32 2015 +0000
description:
Add driver for AM335x TRNG module.
diffstat:
sys/arch/arm/omap/am335x_prcm.h | 3 +-
sys/arch/arm/omap/am335x_trng.c | 184 +++++++++++++++++++++++++++++++++++++
sys/arch/arm/omap/am335x_trngreg.h | 44 ++++++++
sys/arch/arm/omap/files.omap2 | 6 +-
sys/arch/arm/omap/omap2_reg.h | 8 +-
5 files changed, 242 insertions(+), 3 deletions(-)
diffs (293 lines):
diff -r a8bf6137c351 -r 04c95096ddcd sys/arch/arm/omap/am335x_prcm.h
--- a/sys/arch/arm/omap/am335x_prcm.h Sat Jun 06 13:48:37 2015 +0000
+++ b/sys/arch/arm/omap/am335x_prcm.h Sat Jun 06 14:00:32 2015 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: am335x_prcm.h,v 1.8 2014/07/20 23:08:43 bouyer Exp $ */
+/* $NetBSD: am335x_prcm.h,v 1.9 2015/06/06 14:00:32 jmcneill Exp $ */
/*
* TI OMAP Power, Reset, and Clock Management on the AM335x
@@ -63,6 +63,7 @@
#define CM_PER_TIMER2_CLKCTRL 0x080
#define CM_PER_TIMER3_CLKCTRL 0x084
#define CM_PER_TIMER4_CLKCTRL 0x088
+#define CM_PER_RNG_CLKCTRL 0x090
#define CM_PER_GPIO1_CLKCTRL 0x0AC
#define CM_PER_GPIO2_CLKCTRL 0x0B0
#define CM_PER_GPIO3_CLKCTRL 0x0B4
diff -r a8bf6137c351 -r 04c95096ddcd sys/arch/arm/omap/am335x_trng.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/arch/arm/omap/am335x_trng.c Sat Jun 06 14:00:32 2015 +0000
@@ -0,0 +1,184 @@
+/* $NetBSD: am335x_trng.c,v 1.1 2015/06/06 14:00:32 jmcneill Exp $ */
+
+/*-
+ * Copyright (c) 2015 Jared D. McNeill <jmcneill%invisible.ca@localhost>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__KERNEL_RCSID(0, "$NetBSD: am335x_trng.c,v 1.1 2015/06/06 14:00:32 jmcneill Exp $");
+
+#include "opt_omap.h"
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/device.h>
+#include <sys/conf.h>
+#include <sys/intr.h>
+#include <sys/mutex.h>
+#include <sys/bus.h>
+#include <sys/rndpool.h>
+#include <sys/rndsource.h>
+
+#include <arm/omap/am335x_prcm.h>
+#include <arm/omap/omap2_prcm.h>
+#include <arm/omap/sitara_cm.h>
+#include <arm/omap/sitara_cmreg.h>
+
+#include <arm/omap/omap2_reg.h>
+#include <arm/omap/omap2_obiovar.h>
+
+#include <arm/omap/am335x_trngreg.h>
+
+static const struct omap_module rng_module =
+ { AM335X_PRCM_CM_PER, CM_PER_RNG_CLKCTRL };
+
+struct trng_softc {
+ device_t sc_dev;
+ bus_space_tag_t sc_iot;
+ bus_space_handle_t sc_ioh;
+
+ kmutex_t sc_intr_lock;
+ kmutex_t sc_rnd_lock;
+ u_int sc_bytes_wanted;
+ void *sc_sih;
+ krndsource_t sc_rndsource;
+};
+
+static int trng_match(device_t, cfdata_t, void *);
+static void trng_attach(device_t, device_t, void *);
+static void trng_softintr(void *);
+static void trng_callback(size_t, void *);
+
+CFATTACH_DECL_NEW(trng, sizeof(struct trng_softc),
+ trng_match, trng_attach, NULL, NULL);
+
+#define TRNG_READ(sc, reg) \
+ bus_space_read_4((sc)->sc_iot, (sc)->sc_ioh, (reg))
+#define TRNG_WRITE(sc, reg, val) \
+ bus_space_write_4((sc)->sc_iot, (sc)->sc_ioh, (reg), (val))
+
+static int
+trng_match(device_t parent, cfdata_t match, void *aux)
+{
+ struct obio_attach_args *obio = aux;
+
+ if (obio->obio_addr == AM335X_TRNG_BASE &&
+ obio->obio_size == AM335X_TRNG_SIZE &&
+ obio->obio_intr == AM335X_INT_TRNG)
+ return 1;
+
+ return 0;
+}
+
+static void
+trng_attach(device_t parent, device_t self, void *aux)
+{
+ struct trng_softc *sc = device_private(self);
+ struct obio_attach_args *obio = aux;
+
+ sc->sc_dev = self;
+ sc->sc_iot = obio->obio_iot;
+ if (bus_space_map(obio->obio_iot, obio->obio_addr, obio->obio_size,
+ 0, &sc->sc_ioh) != 0) {
+ aprint_error(": couldn't map address spcae\n");
+ return;
+ }
+ mutex_init(&sc->sc_intr_lock, MUTEX_DEFAULT, IPL_SERIAL);
+ mutex_init(&sc->sc_rnd_lock, MUTEX_DEFAULT, IPL_SERIAL);
+ sc->sc_bytes_wanted = 0;
+ sc->sc_sih = softint_establish(SOFTINT_SERIAL|SOFTINT_MPSAFE,
+ trng_softintr, sc);
+ if (sc->sc_sih == NULL) {
+ aprint_error(": couldn't establish softint\n");
+ return;
+ }
+
+ prcm_module_enable(&rng_module);
+
+ if ((TRNG_READ(sc, TRNG_CONTROL_REG) & TRNG_CONTROL_ENABLE) == 0) {
+ TRNG_WRITE(sc, TRNG_CONFIG_REG,
+ __SHIFTIN(0x21, TRNG_CONFIG_MIN_REFILL) |
+ __SHIFTIN(0x22, TRNG_CONFIG_MAX_REFILL));
+ TRNG_WRITE(sc, TRNG_CONTROL_REG,
+ __SHIFTIN(0x21, TRNG_CONTROL_STARTUP_CYCLES) |
+ TRNG_CONTROL_ENABLE);
+ }
+
+ rndsource_setcb(&sc->sc_rndsource, trng_callback, sc);
+ rnd_attach_source(&sc->sc_rndsource, device_xname(self), RND_TYPE_RNG,
+ RND_FLAG_COLLECT_VALUE|RND_FLAG_HASCB);
+
+ aprint_naive("\n");
+ aprint_normal("\n");
+
+ trng_callback(RND_POOLBITS / NBBY, sc);
+}
+
+static void
+trng_softintr(void *priv)
+{
+ struct trng_softc * const sc = priv;
+ uint32_t buf[2];
+ u_int retry;
+
+ mutex_enter(&sc->sc_intr_lock);
+ while (sc->sc_bytes_wanted) {
+ for (retry = 10; retry > 0; retry--) {
+ if (TRNG_READ(sc, TRNG_STATUS_REG) & TRNG_STATUS_READY)
+ break;
+ delay(10);
+ }
+ if (retry == 0)
+ break;
+ buf[0] = TRNG_READ(sc, TRNG_OUTPUT_L_REG);
+ buf[1] = TRNG_READ(sc, TRNG_OUTPUT_H_REG);
+ TRNG_WRITE(sc, TRNG_INTACK_REG, TRNG_INTACK_READY);
+ mutex_exit(&sc->sc_intr_lock);
+ mutex_enter(&sc->sc_rnd_lock);
+ rnd_add_data(&sc->sc_rndsource, buf, sizeof(buf),
+ sizeof(buf) * NBBY);
+ mutex_exit(&sc->sc_rnd_lock);
+ mutex_enter(&sc->sc_intr_lock);
+ sc->sc_bytes_wanted -= MIN(sc->sc_bytes_wanted, sizeof(buf));
+ }
+ explicit_memset(buf, 0, sizeof(buf));
+ mutex_exit(&sc->sc_intr_lock);
+}
+
+static void
+trng_callback(size_t bytes_wanted, void *priv)
+{
+ struct trng_softc * const sc = priv;
+
+ mutex_enter(&sc->sc_intr_lock);
+ if (sc->sc_bytes_wanted == 0) {
+ softint_schedule(sc->sc_sih);
+ }
+ if (bytes_wanted > (UINT_MAX - sc->sc_bytes_wanted)) {
+ sc->sc_bytes_wanted = UINT_MAX;
+ } else {
+ sc->sc_bytes_wanted += bytes_wanted;
+ }
+ mutex_exit(&sc->sc_intr_lock);
+}
diff -r a8bf6137c351 -r 04c95096ddcd sys/arch/arm/omap/am335x_trngreg.h
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/arch/arm/omap/am335x_trngreg.h Sat Jun 06 14:00:32 2015 +0000
@@ -0,0 +1,44 @@
+/* $NetBSD: am335x_trngreg.h,v 1.1 2015/06/06 14:00:32 jmcneill Exp $ */
+
+/*-
+ * Copyright (c) 2015 Jared D. McNeill <jmcneill%invisible.ca@localhost>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef _AM335X_TRNGREG_H
+#define _AM335X_TRNGREG_H
+
+#define TRNG_OUTPUT_L_REG 0x00
+#define TRNG_OUTPUT_H_REG 0x04
+#define TRNG_STATUS_REG 0x08
+#define TRNG_STATUS_READY __BIT(0)
+#define TRNG_INTACK_REG 0x10
+#define TRNG_INTACK_READY __BIT(0)
+#define TRNG_CONTROL_REG 0x14
+#define TRNG_CONTROL_STARTUP_CYCLES __BITS(31,16)
+#define TRNG_CONTROL_ENABLE __BIT(10)
+#define TRNG_CONFIG_REG 0x18
+#define TRNG_CONFIG_MAX_REFILL __BITS(31,16)
+#define TRNG_CONFIG_MIN_REFILL __BITS(7,0)
+
+#endif /* !_AM335X_TRNGREG_H */
diff -r a8bf6137c351 -r 04c95096ddcd sys/arch/arm/omap/files.omap2
--- a/sys/arch/arm/omap/files.omap2 Sat Jun 06 13:48:37 2015 +0000
+++ b/sys/arch/arm/omap/files.omap2 Sat Jun 06 14:00:32 2015 +0000
@@ -1,4 +1,4 @@
-# $NetBSD: files.omap2,v 1.30 2015/04/14 18:37:43 bouyer Exp $
+# $NetBSD: files.omap2,v 1.31 2015/06/06 14:00:32 jmcneill Exp $
#
# Configuration info for Texas Instruments OMAP2/OMAP3 CPU support
# Based on xscale/files.pxa2x0
@@ -174,6 +174,10 @@
attach edma at obio
file arch/arm/omap/omap_edma.c edma needs-flag
+device trng
+attach trng at obio
+file arch/arm/omap/am335x_trng.c trng
+
# these bus space methods are not bus-specific ...
#
file arch/arm/omap/omap_nobyteacc_space.c emifs | gpmc
diff -r a8bf6137c351 -r 04c95096ddcd sys/arch/arm/omap/omap2_reg.h
--- a/sys/arch/arm/omap/omap2_reg.h Sat Jun 06 13:48:37 2015 +0000
+++ b/sys/arch/arm/omap/omap2_reg.h Sat Jun 06 14:00:32 2015 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: omap2_reg.h,v 1.29 2015/04/14 18:37:43 bouyer Exp $ */
+/* $NetBSD: omap2_reg.h,v 1.30 2015/06/06 14:00:32 jmcneill Exp $ */
/*
* Copyright (c) 2007 Microsoft
@@ -912,4 +912,10 @@
#define AM335X_INT_TCERRINT0 112
#define AM335X_INT_TCERRINT1 113
#define AM335X_INT_TCERRINT2 114
+
+/* TRNG */
+#define AM335X_TRNG_BASE 0x48310000
+#define AM335X_TRNG_SIZE 0x2000
+#define AM335X_INT_TRNG 111
+
#endif /* _ARM_OMAP_OMAP2_REG_H_ */
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