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-rw-r--r--hw/arm/fsl-imx25.c11
-rw-r--r--hw/misc/Makefile.objs1
-rw-r--r--hw/misc/imx_rngc.c278
-rw-r--r--include/hw/arm/fsl-imx25.h5
-rw-r--r--include/hw/misc/imx_rngc.h35
5 files changed, 330 insertions, 0 deletions
diff --git a/hw/arm/fsl-imx25.c b/hw/arm/fsl-imx25.c
index 3cb5a8fdfd..da3471b395 100644
--- a/hw/arm/fsl-imx25.c
+++ b/hw/arm/fsl-imx25.c
@@ -62,6 +62,9 @@ static void fsl_imx25_init(Object *obj)
sysbus_init_child_obj(obj, "fec", &s->fec, sizeof(s->fec), TYPE_IMX_FEC);
+ sysbus_init_child_obj(obj, "rngc", &s->rngc, sizeof(s->rngc),
+ TYPE_IMX_RNGC);
+
for (i = 0; i < FSL_IMX25_NUM_I2CS; i++) {
sysbus_init_child_obj(obj, "i2c[*]", &s->i2c[i], sizeof(s->i2c[i]),
TYPE_IMX_I2C);
@@ -188,6 +191,14 @@ static void fsl_imx25_realize(DeviceState *dev, Error **errp)
sysbus_connect_irq(SYS_BUS_DEVICE(&s->fec), 0,
qdev_get_gpio_in(DEVICE(&s->avic), FSL_IMX25_FEC_IRQ));
+ object_property_set_bool(OBJECT(&s->rngc), true, "realized", &err);
+ if (err) {
+ error_propagate(errp, err);
+ return;
+ }
+ sysbus_mmio_map(SYS_BUS_DEVICE(&s->rngc), 0, FSL_IMX25_RNGC_ADDR);
+ sysbus_connect_irq(SYS_BUS_DEVICE(&s->rngc), 0,
+ qdev_get_gpio_in(DEVICE(&s->avic), FSL_IMX25_RNGC_IRQ));
/* Initialize all I2C */
for (i = 0; i < FSL_IMX25_NUM_I2CS; i++) {
diff --git a/hw/misc/Makefile.objs b/hw/misc/Makefile.objs
index c6ecbdd7b0..da993f45b7 100644
--- a/hw/misc/Makefile.objs
+++ b/hw/misc/Makefile.objs
@@ -42,6 +42,7 @@ common-obj-$(CONFIG_IMX) += imx7_ccm.o
common-obj-$(CONFIG_IMX) += imx2_wdt.o
common-obj-$(CONFIG_IMX) += imx7_snvs.o
common-obj-$(CONFIG_IMX) += imx7_gpr.o
+common-obj-$(CONFIG_IMX) += imx_rngc.o
common-obj-$(CONFIG_MILKYMIST) += milkymist-hpdmc.o
common-obj-$(CONFIG_MILKYMIST) += milkymist-pfpu.o
common-obj-$(CONFIG_MAINSTONE) += mst_fpga.o
diff --git a/hw/misc/imx_rngc.c b/hw/misc/imx_rngc.c
new file mode 100644
index 0000000000..4c270df2db
--- /dev/null
+++ b/hw/misc/imx_rngc.c
@@ -0,0 +1,278 @@
+/*
+ * Freescale i.MX RNGC emulation
+ *
+ * Copyright (C) 2020 Martin Kaiser <martin@kaiser.cx>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ *
+ * This driver provides the minimum functionality to initialize and seed
+ * an rngc and to read random numbers. The rngb that is found in imx25
+ * chipsets is also supported.
+ */
+
+#include "qemu/osdep.h"
+#include "qemu/main-loop.h"
+#include "qemu/module.h"
+#include "qemu/log.h"
+#include "qemu/guest-random.h"
+#include "hw/irq.h"
+#include "hw/misc/imx_rngc.h"
+#include "migration/vmstate.h"
+
+#define RNGC_NAME "i.MX RNGC"
+
+#define RNGC_VER_ID 0x00
+#define RNGC_COMMAND 0x04
+#define RNGC_CONTROL 0x08
+#define RNGC_STATUS 0x0C
+#define RNGC_FIFO 0x14
+
+/* These version info are reported by the rngb in an imx258 chip. */
+#define RNG_TYPE_RNGB 0x1
+#define V_MAJ 0x2
+#define V_MIN 0x40
+
+#define RNGC_CMD_BIT_SW_RST 0x40
+#define RNGC_CMD_BIT_CLR_ERR 0x20
+#define RNGC_CMD_BIT_CLR_INT 0x10
+#define RNGC_CMD_BIT_SEED 0x02
+#define RNGC_CMD_BIT_SELF_TEST 0x01
+
+#define RNGC_CTRL_BIT_MASK_ERR 0x40
+#define RNGC_CTRL_BIT_MASK_DONE 0x20
+#define RNGC_CTRL_BIT_AUTO_SEED 0x10
+
+/* the current status for self-test and seed operations */
+#define OP_IDLE 0
+#define OP_RUN 1
+#define OP_DONE 2
+
+static uint64_t imx_rngc_read(void *opaque, hwaddr offset, unsigned size)
+{
+ IMXRNGCState *s = IMX_RNGC(opaque);
+ uint64_t val = 0;
+
+ switch (offset) {
+ case RNGC_VER_ID:
+ val |= RNG_TYPE_RNGB << 28 | V_MAJ << 8 | V_MIN;
+ break;
+
+ case RNGC_COMMAND:
+ if (s->op_seed == OP_RUN) {
+ val |= RNGC_CMD_BIT_SEED;
+ }
+ if (s->op_self_test == OP_RUN) {
+ val |= RNGC_CMD_BIT_SELF_TEST;
+ }
+ break;
+
+ case RNGC_CONTROL:
+ /*
+ * The CTL_ACC and VERIF_MODE bits are not supported yet.
+ * They read as 0.
+ */
+ val |= s->mask;
+ if (s->auto_seed) {
+ val |= RNGC_CTRL_BIT_AUTO_SEED;
+ }
+ /*
+ * We don't have an internal fifo like the real hardware.
+ * There's no need for strategy to handle fifo underflows.
+ * We return the FIFO_UFLOW_RESPONSE bits as 0.
+ */
+ break;
+
+ case RNGC_STATUS:
+ /*
+ * We never report any statistics test or self-test errors or any
+ * other errors. STAT_TEST_PF, ST_PF and ERROR are always 0.
+ */
+
+ /*
+ * We don't have an internal fifo, see above. Therefore, we
+ * report back the default fifo size (5 32-bit words) and
+ * indicate that our fifo is always full.
+ */
+ val |= 5 << 12 | 5 << 8;
+
+ /* We always have a new seed available. */
+ val |= 1 << 6;
+
+ if (s->op_seed == OP_DONE) {
+ val |= 1 << 5;
+ }
+ if (s->op_self_test == OP_DONE) {
+ val |= 1 << 4;
+ }
+ if (s->op_seed == OP_RUN || s->op_self_test == OP_RUN) {
+ /*
+ * We're busy if self-test is running or if we're
+ * seeding the prng.
+ */
+ val |= 1 << 1;
+ } else {
+ /*
+ * We're ready to provide secure random numbers whenever
+ * we're not busy.
+ */
+ val |= 1;
+ }
+ break;
+
+ case RNGC_FIFO:
+ qemu_guest_getrandom_nofail(&val, sizeof(val));
+ break;
+ }
+
+ return val;
+}
+
+static void imx_rngc_do_reset(IMXRNGCState *s)
+{
+ s->op_self_test = OP_IDLE;
+ s->op_seed = OP_IDLE;
+ s->mask = 0;
+ s->auto_seed = false;
+}
+
+static void imx_rngc_write(void *opaque, hwaddr offset, uint64_t value,
+ unsigned size)
+{
+ IMXRNGCState *s = IMX_RNGC(opaque);
+
+ switch (offset) {
+ case RNGC_COMMAND:
+ if (value & RNGC_CMD_BIT_SW_RST) {
+ imx_rngc_do_reset(s);
+ }
+
+ /*
+ * For now, both CLR_ERR and CLR_INT clear the interrupt. We
+ * don't report any errors yet.
+ */
+ if (value & (RNGC_CMD_BIT_CLR_ERR | RNGC_CMD_BIT_CLR_INT)) {
+ qemu_irq_lower(s->irq);
+ }
+
+ if (value & RNGC_CMD_BIT_SEED) {
+ s->op_seed = OP_RUN;
+ qemu_bh_schedule(s->seed_bh);
+ }
+
+ if (value & RNGC_CMD_BIT_SELF_TEST) {
+ s->op_self_test = OP_RUN;
+ qemu_bh_schedule(s->self_test_bh);
+ }
+ break;
+
+ case RNGC_CONTROL:
+ /*
+ * The CTL_ACC and VERIF_MODE bits are not supported yet.
+ * We ignore them if they're set by the caller.
+ */
+
+ if (value & RNGC_CTRL_BIT_MASK_ERR) {
+ s->mask |= RNGC_CTRL_BIT_MASK_ERR;
+ } else {
+ s->mask &= ~RNGC_CTRL_BIT_MASK_ERR;
+ }
+
+ if (value & RNGC_CTRL_BIT_MASK_DONE) {
+ s->mask |= RNGC_CTRL_BIT_MASK_DONE;
+ } else {
+ s->mask &= ~RNGC_CTRL_BIT_MASK_DONE;
+ }
+
+ if (value & RNGC_CTRL_BIT_AUTO_SEED) {
+ s->auto_seed = true;
+ } else {
+ s->auto_seed = false;
+ }
+ break;
+ }
+}
+
+static const MemoryRegionOps imx_rngc_ops = {
+ .read = imx_rngc_read,
+ .write = imx_rngc_write,
+ .endianness = DEVICE_NATIVE_ENDIAN,
+};
+
+static void imx_rngc_self_test(void *opaque)
+{
+ IMXRNGCState *s = IMX_RNGC(opaque);
+
+ s->op_self_test = OP_DONE;
+ if (!(s->mask & RNGC_CTRL_BIT_MASK_DONE)) {
+ qemu_irq_raise(s->irq);
+ }
+}
+
+static void imx_rngc_seed(void *opaque)
+{
+ IMXRNGCState *s = IMX_RNGC(opaque);
+
+ s->op_seed = OP_DONE;
+ if (!(s->mask & RNGC_CTRL_BIT_MASK_DONE)) {
+ qemu_irq_raise(s->irq);
+ }
+}
+
+static void imx_rngc_realize(DeviceState *dev, Error **errp)
+{
+ IMXRNGCState *s = IMX_RNGC(dev);
+ SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
+
+ memory_region_init_io(&s->iomem, OBJECT(s), &imx_rngc_ops, s,
+ TYPE_IMX_RNGC, 0x1000);
+ sysbus_init_mmio(sbd, &s->iomem);
+
+ sysbus_init_irq(sbd, &s->irq);
+ s->self_test_bh = qemu_bh_new(imx_rngc_self_test, s);
+ s->seed_bh = qemu_bh_new(imx_rngc_seed, s);
+}
+
+static void imx_rngc_reset(DeviceState *dev)
+{
+ IMXRNGCState *s = IMX_RNGC(dev);
+
+ imx_rngc_do_reset(s);
+}
+
+static const VMStateDescription vmstate_imx_rngc = {
+ .name = RNGC_NAME,
+ .version_id = 1,
+ .minimum_version_id = 1,
+ .fields = (VMStateField[]) {
+ VMSTATE_UINT8(op_self_test, IMXRNGCState),
+ VMSTATE_UINT8(op_seed, IMXRNGCState),
+ VMSTATE_UINT8(mask, IMXRNGCState),
+ VMSTATE_BOOL(auto_seed, IMXRNGCState),
+ VMSTATE_END_OF_LIST()
+ }
+};
+
+static void imx_rngc_class_init(ObjectClass *klass, void *data)
+{
+ DeviceClass *dc = DEVICE_CLASS(klass);
+
+ dc->realize = imx_rngc_realize;
+ dc->reset = imx_rngc_reset;
+ dc->desc = RNGC_NAME,
+ dc->vmsd = &vmstate_imx_rngc;
+}
+
+static const TypeInfo imx_rngc_info = {
+ .name = TYPE_IMX_RNGC,
+ .parent = TYPE_SYS_BUS_DEVICE,
+ .instance_size = sizeof(IMXRNGCState),
+ .class_init = imx_rngc_class_init,
+};
+
+static void imx_rngc_register_types(void)
+{
+ type_register_static(&imx_rngc_info);
+}
+
+type_init(imx_rngc_register_types)
diff --git a/include/hw/arm/fsl-imx25.h b/include/hw/arm/fsl-imx25.h
index 241efb52ae..1c86bb55fb 100644
--- a/include/hw/arm/fsl-imx25.h
+++ b/include/hw/arm/fsl-imx25.h
@@ -24,6 +24,7 @@
#include "hw/timer/imx_gpt.h"
#include "hw/timer/imx_epit.h"
#include "hw/net/imx_fec.h"
+#include "hw/misc/imx_rngc.h"
#include "hw/i2c/imx_i2c.h"
#include "hw/gpio/imx_gpio.h"
#include "exec/memory.h"
@@ -50,6 +51,7 @@ typedef struct FslIMX25State {
IMXGPTState gpt[FSL_IMX25_NUM_GPTS];
IMXEPITState epit[FSL_IMX25_NUM_EPITS];
IMXFECState fec;
+ IMXRNGCState rngc;
IMXI2CState i2c[FSL_IMX25_NUM_I2CS];
IMXGPIOState gpio[FSL_IMX25_NUM_GPIOS];
MemoryRegion rom[2];
@@ -211,6 +213,8 @@ typedef struct FslIMX25State {
#define FSL_IMX25_GPIO4_SIZE 0x4000
#define FSL_IMX25_GPIO3_ADDR 0x53FA4000
#define FSL_IMX25_GPIO3_SIZE 0x4000
+#define FSL_IMX25_RNGC_ADDR 0x53FB0000
+#define FSL_IMX25_RNGC_SIZE 0x4000
#define FSL_IMX25_GPIO1_ADDR 0x53FCC000
#define FSL_IMX25_GPIO1_SIZE 0x4000
#define FSL_IMX25_GPIO2_ADDR 0x53FD0000
@@ -238,6 +242,7 @@ typedef struct FslIMX25State {
#define FSL_IMX25_EPIT1_IRQ 28
#define FSL_IMX25_EPIT2_IRQ 27
#define FSL_IMX25_FEC_IRQ 57
+#define FSL_IMX25_RNGC_IRQ 22
#define FSL_IMX25_I2C1_IRQ 3
#define FSL_IMX25_I2C2_IRQ 4
#define FSL_IMX25_I2C3_IRQ 10
diff --git a/include/hw/misc/imx_rngc.h b/include/hw/misc/imx_rngc.h
new file mode 100644
index 0000000000..f0d2b44d4f
--- /dev/null
+++ b/include/hw/misc/imx_rngc.h
@@ -0,0 +1,35 @@
+/*
+ * Freescale i.MX RNGC emulation
+ *
+ * Copyright (C) 2020 Martin Kaiser <martin@kaiser.cx>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#ifndef IMX_RNGC_H
+#define IMX_RNGC_H
+
+#include "hw/sysbus.h"
+
+#define TYPE_IMX_RNGC "imx.rngc"
+#define IMX_RNGC(obj) OBJECT_CHECK(IMXRNGCState, (obj), TYPE_IMX_RNGC)
+
+typedef struct IMXRNGCState {
+ /*< private >*/
+ SysBusDevice parent_obj;
+
+ /*< public >*/
+ MemoryRegion iomem;
+
+ uint8_t op_self_test;
+ uint8_t op_seed;
+ uint8_t mask;
+ bool auto_seed;
+
+ QEMUBH *self_test_bh;
+ QEMUBH *seed_bh;
+ qemu_irq irq;
+} IMXRNGCState;
+
+#endif /* IMX_RNGC_H */
generated by cgit v1.2.3 (git 2.26.2) at 2024-12-27 09:11:49 +0000