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hw/usb: Add basic i.MX USB Phy support
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Add basic USB PHY support as implemented in i.MX23, i.MX28, i.MX6,
and i.MX7 SoCs.

The only support really needed - at least to boot Linux - is support
for soft reset, which needs to reset various registers to their initial
value. Otherwise, just record register values.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Message-id: 20200313014551.12554-2-linux@roeck-us.net
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
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@groeck @pm215
groeck authored and pm215 committed Mar 17, 2020
1 parent a98135f commit 0701a5e
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Showing 6 changed files with 288 additions and 0 deletions.
2 changes: 2 additions & 0 deletions MAINTAINERS
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Expand Up @@ -764,6 +764,8 @@ F: hw/arm/sabrelite.c
F: hw/arm/fsl-imx6.c
F: hw/misc/imx6_*.c
F: hw/ssi/imx_spi.c
F: hw/usb/imx-usb-phy.c
F: include/hw/usb/imx-usb-phy.h
F: include/hw/arm/fsl-imx6.h
F: include/hw/misc/imx6_*.h
F: include/hw/ssi/imx_spi.h
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1 change: 1 addition & 0 deletions hw/arm/Kconfig
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Expand Up @@ -373,6 +373,7 @@ config FSL_IMX6
select IMX
select IMX_FEC
select IMX_I2C
select IMX_USBPHY
select SDHCI

config ASPEED_SOC
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5 changes: 5 additions & 0 deletions hw/usb/Kconfig
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Expand Up @@ -91,3 +91,8 @@ config USB_STORAGE_MTP
bool
default y
depends on USB

config IMX_USBPHY
bool
default y
depends on USB
2 changes: 2 additions & 0 deletions hw/usb/Makefile.objs
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Expand Up @@ -61,3 +61,5 @@ common-obj-$(CONFIG_XEN) += xen-usb.o
xen-usb.o-cflags := $(LIBUSB_CFLAGS)
xen-usb.o-libs := $(LIBUSB_LIBS)
endif

common-obj-$(CONFIG_IMX_USBPHY) += imx-usb-phy.o
225 changes: 225 additions & 0 deletions hw/usb/imx-usb-phy.c
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@@ -0,0 +1,225 @@
/*
* i.MX USB PHY
*
* Copyright (c) 2020 Guenter Roeck <linux@roeck-us.net>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*
* We need to implement basic reset control in the PHY control register.
* For everything else, it is sufficient to set whatever is written.
*/

#include "qemu/osdep.h"
#include "hw/usb/imx-usb-phy.h"
#include "migration/vmstate.h"
#include "qemu/log.h"
#include "qemu/module.h"

static const VMStateDescription vmstate_imx_usbphy = {
.name = TYPE_IMX_USBPHY,
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_UINT32_ARRAY(usbphy, IMXUSBPHYState, USBPHY_MAX),
VMSTATE_END_OF_LIST()
},
};

static void imx_usbphy_softreset(IMXUSBPHYState *s)
{
s->usbphy[USBPHY_PWD] = 0x001e1c00;
s->usbphy[USBPHY_TX] = 0x10060607;
s->usbphy[USBPHY_RX] = 0x00000000;
s->usbphy[USBPHY_CTRL] = 0xc0200000;
}

static void imx_usbphy_reset(DeviceState *dev)
{
IMXUSBPHYState *s = IMX_USBPHY(dev);

s->usbphy[USBPHY_STATUS] = 0x00000000;
s->usbphy[USBPHY_DEBUG] = 0x7f180000;
s->usbphy[USBPHY_DEBUG0_STATUS] = 0x00000000;
s->usbphy[USBPHY_DEBUG1] = 0x00001000;
s->usbphy[USBPHY_VERSION] = 0x04020000;

imx_usbphy_softreset(s);
}

static uint64_t imx_usbphy_read(void *opaque, hwaddr offset, unsigned size)
{
IMXUSBPHYState *s = (IMXUSBPHYState *)opaque;
uint32_t index = offset >> 2;
uint32_t value;

switch (index) {
case USBPHY_PWD_SET:
case USBPHY_TX_SET:
case USBPHY_RX_SET:
case USBPHY_CTRL_SET:
case USBPHY_DEBUG_SET:
case USBPHY_DEBUG1_SET:
/*
* All REG_NAME_SET register access are in fact targeting the
* REG_NAME register.
*/
value = s->usbphy[index - 1];
break;
case USBPHY_PWD_CLR:
case USBPHY_TX_CLR:
case USBPHY_RX_CLR:
case USBPHY_CTRL_CLR:
case USBPHY_DEBUG_CLR:
case USBPHY_DEBUG1_CLR:
/*
* All REG_NAME_CLR register access are in fact targeting the
* REG_NAME register.
*/
value = s->usbphy[index - 2];
break;
case USBPHY_PWD_TOG:
case USBPHY_TX_TOG:
case USBPHY_RX_TOG:
case USBPHY_CTRL_TOG:
case USBPHY_DEBUG_TOG:
case USBPHY_DEBUG1_TOG:
/*
* All REG_NAME_TOG register access are in fact targeting the
* REG_NAME register.
*/
value = s->usbphy[index - 3];
break;
default:
value = s->usbphy[index];
break;
}
return (uint64_t)value;
}

static void imx_usbphy_write(void *opaque, hwaddr offset, uint64_t value,
unsigned size)
{
IMXUSBPHYState *s = (IMXUSBPHYState *)opaque;
uint32_t index = offset >> 2;

switch (index) {
case USBPHY_CTRL:
s->usbphy[index] = value;
if (value & USBPHY_CTRL_SFTRST) {
imx_usbphy_softreset(s);
}
break;
case USBPHY_PWD:
case USBPHY_TX:
case USBPHY_RX:
case USBPHY_STATUS:
case USBPHY_DEBUG:
case USBPHY_DEBUG1:
s->usbphy[index] = value;
break;
case USBPHY_CTRL_SET:
s->usbphy[index - 1] |= value;
if (value & USBPHY_CTRL_SFTRST) {
imx_usbphy_softreset(s);
}
break;
case USBPHY_PWD_SET:
case USBPHY_TX_SET:
case USBPHY_RX_SET:
case USBPHY_DEBUG_SET:
case USBPHY_DEBUG1_SET:
/*
* All REG_NAME_SET register access are in fact targeting the
* REG_NAME register. So we change the value of the REG_NAME
* register, setting bits passed in the value.
*/
s->usbphy[index - 1] |= value;
break;
case USBPHY_PWD_CLR:
case USBPHY_TX_CLR:
case USBPHY_RX_CLR:
case USBPHY_CTRL_CLR:
case USBPHY_DEBUG_CLR:
case USBPHY_DEBUG1_CLR:
/*
* All REG_NAME_CLR register access are in fact targeting the
* REG_NAME register. So we change the value of the REG_NAME
* register, unsetting bits passed in the value.
*/
s->usbphy[index - 2] &= ~value;
break;
case USBPHY_CTRL_TOG:
s->usbphy[index - 3] ^= value;
if ((value & USBPHY_CTRL_SFTRST) &&
(s->usbphy[index - 3] & USBPHY_CTRL_SFTRST)) {
imx_usbphy_softreset(s);
}
break;
case USBPHY_PWD_TOG:
case USBPHY_TX_TOG:
case USBPHY_RX_TOG:
case USBPHY_DEBUG_TOG:
case USBPHY_DEBUG1_TOG:
/*
* All REG_NAME_TOG register access are in fact targeting the
* REG_NAME register. So we change the value of the REG_NAME
* register, toggling bits passed in the value.
*/
s->usbphy[index - 3] ^= value;
break;
default:
/* Other registers are read-only */
break;
}
}

static const struct MemoryRegionOps imx_usbphy_ops = {
.read = imx_usbphy_read,
.write = imx_usbphy_write,
.endianness = DEVICE_NATIVE_ENDIAN,
.valid = {
/*
* Our device would not work correctly if the guest was doing
* unaligned access. This might not be a limitation on the real
* device but in practice there is no reason for a guest to access
* this device unaligned.
*/
.min_access_size = 4,
.max_access_size = 4,
.unaligned = false,
},
};

static void imx_usbphy_realize(DeviceState *dev, Error **errp)
{
IMXUSBPHYState *s = IMX_USBPHY(dev);

memory_region_init_io(&s->iomem, OBJECT(s), &imx_usbphy_ops, s,
"imx-usbphy", 0x1000);
sysbus_init_mmio(SYS_BUS_DEVICE(s), &s->iomem);
}

static void imx_usbphy_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);

dc->reset = imx_usbphy_reset;
dc->vmsd = &vmstate_imx_usbphy;
dc->desc = "i.MX USB PHY Module";
dc->realize = imx_usbphy_realize;
}

static const TypeInfo imx_usbphy_info = {
.name = TYPE_IMX_USBPHY,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(IMXUSBPHYState),
.class_init = imx_usbphy_class_init,
};

static void imx_usbphy_register_types(void)
{
type_register_static(&imx_usbphy_info);
}

type_init(imx_usbphy_register_types)
53 changes: 53 additions & 0 deletions include/hw/usb/imx-usb-phy.h
View file
@@ -0,0 +1,53 @@
#ifndef IMX_USB_PHY_H
#define IMX_USB_PHY_H

#include "hw/sysbus.h"
#include "qemu/bitops.h"

enum IMXUsbPhyRegisters {
USBPHY_PWD,
USBPHY_PWD_SET,
USBPHY_PWD_CLR,
USBPHY_PWD_TOG,
USBPHY_TX,
USBPHY_TX_SET,
USBPHY_TX_CLR,
USBPHY_TX_TOG,
USBPHY_RX,
USBPHY_RX_SET,
USBPHY_RX_CLR,
USBPHY_RX_TOG,
USBPHY_CTRL,
USBPHY_CTRL_SET,
USBPHY_CTRL_CLR,
USBPHY_CTRL_TOG,
USBPHY_STATUS,
USBPHY_DEBUG = 0x14,
USBPHY_DEBUG_SET,
USBPHY_DEBUG_CLR,
USBPHY_DEBUG_TOG,
USBPHY_DEBUG0_STATUS,
USBPHY_DEBUG1 = 0x1c,
USBPHY_DEBUG1_SET,
USBPHY_DEBUG1_CLR,
USBPHY_DEBUG1_TOG,
USBPHY_VERSION,
USBPHY_MAX
};

#define USBPHY_CTRL_SFTRST BIT(31)

#define TYPE_IMX_USBPHY "imx.usbphy"
#define IMX_USBPHY(obj) OBJECT_CHECK(IMXUSBPHYState, (obj), TYPE_IMX_USBPHY)

typedef struct IMXUSBPHYState {
/* <private> */
SysBusDevice parent_obj;

/* <public> */
MemoryRegion iomem;

uint32_t usbphy[USBPHY_MAX];
} IMXUSBPHYState;

#endif /* IMX_USB_PHY_H */

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