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/*
* Copyright (c) 2018, Impinj, Inc.
*
* i.MX7 GPCv2 block emulation code
*
* Author: Andrey Smirnov <andrew.smirnov@gmail.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#include "qemu/osdep.h"
#include "hw/intc/imx_gpcv2.h"
#include "migration/vmstate.h"
#include "qemu/log.h"
#include "qemu/module.h"
#define GPC_PU_PGC_SW_PUP_REQ 0x0f8
#define GPC_PU_PGC_SW_PDN_REQ 0x104
#define USB_HSIC_PHY_SW_Pxx_REQ BIT(4)
#define USB_OTG2_PHY_SW_Pxx_REQ BIT(3)
#define USB_OTG1_PHY_SW_Pxx_REQ BIT(2)
#define PCIE_PHY_SW_Pxx_REQ BIT(1)
#define MIPI_PHY_SW_Pxx_REQ BIT(0)
static void imx_gpcv2_reset(DeviceState *dev)
{
IMXGPCv2State *s = IMX_GPCV2(dev);
memset(s->regs, 0, sizeof(s->regs));
}
static uint64_t imx_gpcv2_read(void *opaque, hwaddr offset,
unsigned size)
{
IMXGPCv2State *s = opaque;
return s->regs[offset / sizeof(uint32_t)];
}
static void imx_gpcv2_write(void *opaque, hwaddr offset,
uint64_t value, unsigned size)
{
IMXGPCv2State *s = opaque;
const size_t idx = offset / sizeof(uint32_t);
s->regs[idx] = value;
/*
* Real HW will clear those bits once as a way to indicate that
* power up request is complete
*/
if (offset == GPC_PU_PGC_SW_PUP_REQ ||
offset == GPC_PU_PGC_SW_PDN_REQ) {
s->regs[idx] &= ~(USB_HSIC_PHY_SW_Pxx_REQ |
USB_OTG2_PHY_SW_Pxx_REQ |
USB_OTG1_PHY_SW_Pxx_REQ |
PCIE_PHY_SW_Pxx_REQ |
MIPI_PHY_SW_Pxx_REQ);
}
}
static const struct MemoryRegionOps imx_gpcv2_ops = {
.read = imx_gpcv2_read,
.write = imx_gpcv2_write,
.endianness = DEVICE_NATIVE_ENDIAN,
.impl = {
/*
* 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_gpcv2_init(Object *obj)
{
SysBusDevice *sd = SYS_BUS_DEVICE(obj);
IMXGPCv2State *s = IMX_GPCV2(obj);
memory_region_init_io(&s->iomem,
obj,
&imx_gpcv2_ops,
s,
TYPE_IMX_GPCV2 ".iomem",
sizeof(s->regs));
sysbus_init_mmio(sd, &s->iomem);
}
static const VMStateDescription vmstate_imx_gpcv2 = {
.name = TYPE_IMX_GPCV2,
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_UINT32_ARRAY(regs, IMXGPCv2State, GPC_NUM),
VMSTATE_END_OF_LIST()
},
};
static void imx_gpcv2_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->reset = imx_gpcv2_reset;
dc->vmsd = &vmstate_imx_gpcv2;
dc->desc = "i.MX GPCv2 Module";
}
static const TypeInfo imx_gpcv2_info = {
.name = TYPE_IMX_GPCV2,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(IMXGPCv2State),
.instance_init = imx_gpcv2_init,
.class_init = imx_gpcv2_class_init,
};
static void imx_gpcv2_register_type(void)
{
type_register_static(&imx_gpcv2_info);
}
type_init(imx_gpcv2_register_type)
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