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i.MX: add an emulation for RNGC

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Add an emulation for the RNGC random number generator and the compatible
RNGB variant. These peripherals are included (at least) in imx25 and
imx35 chipsets.

The emulation supports the initial self test, reseeding the prng and
reading random numbers.

Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Martin Kaiser 2020-01-17 14:09:31 +00:00 committed by Peter Maydell
parent 21bf9b06cb
commit f03965490e
5 changed files with 330 additions and 0 deletions
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11
hw/arm/fsl-imx25.c
View File

@ -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++) {

1
hw/misc/Makefile.objs
View File

@ -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

278
hw/misc/imx_rngc.c Normal file
View File

@ -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)

5
include/hw/arm/fsl-imx25.h
View File

@ -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

35
include/hw/misc/imx_rngc.h Normal file
View File

@ -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 */