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qemu-patch-raspberry4/hw/misc/aspeed_lpc.c
Andrew Jeffery c59f781e3b hw/misc: Model KCS devices in the Aspeed LPC controller 
Keyboard-Controller-Style devices for IPMI purposes are exposed via LPC
IO cycles from the BMC to the host.

Expose support on the BMC side by implementing the usual MMIO
behaviours, and expose the ability to inspect the KCS registers in
"host" style by accessing QOM properties associated with each register.

The model caters to the IRQ style of both the AST2600 and the earlier
SoCs (AST2400 and AST2500). The AST2600 allocates an IRQ for each LPC
sub-device, while there is a single IRQ shared across all subdevices on
the AST2400 and AST2500.

Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20210302014317.915120-6-andrew@aj.id.au>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
2021-03-09 12:01:28 +01:00

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/*
* ASPEED LPC Controller
*
* Copyright (C) 2017-2018 IBM Corp.
*
* This code is licensed under the GPL version 2 or later. See
* the COPYING file in the top-level directory.
*/
#include "qemu/osdep.h"
#include "qemu/log.h"
#include "qemu/error-report.h"
#include "hw/misc/aspeed_lpc.h"
#include "qapi/error.h"
#include "qapi/visitor.h"
#include "hw/irq.h"
#include "hw/qdev-properties.h"
#include "migration/vmstate.h"
#define TO_REG(offset) ((offset) >> 2)
#define HICR0 TO_REG(0x00)
#define HICR0_LPC3E BIT(7)
#define HICR0_LPC2E BIT(6)
#define HICR0_LPC1E BIT(5)
#define HICR1 TO_REG(0x04)
#define HICR2 TO_REG(0x08)
#define HICR2_IBFIE3 BIT(3)
#define HICR2_IBFIE2 BIT(2)
#define HICR2_IBFIE1 BIT(1)
#define HICR3 TO_REG(0x0C)
#define HICR4 TO_REG(0x10)
#define HICR4_KCSENBL BIT(2)
#define IDR1 TO_REG(0x24)
#define IDR2 TO_REG(0x28)
#define IDR3 TO_REG(0x2C)
#define ODR1 TO_REG(0x30)
#define ODR2 TO_REG(0x34)
#define ODR3 TO_REG(0x38)
#define STR1 TO_REG(0x3C)
#define STR_OBF BIT(0)
#define STR_IBF BIT(1)
#define STR_CMD_DATA BIT(3)
#define STR2 TO_REG(0x40)
#define STR3 TO_REG(0x44)
#define HICR5 TO_REG(0x80)
#define HICR6 TO_REG(0x84)
#define HICR7 TO_REG(0x88)
#define HICR8 TO_REG(0x8C)
#define HICRB TO_REG(0x100)
#define HICRB_IBFIE4 BIT(1)
#define HICRB_LPC4E BIT(0)
#define IDR4 TO_REG(0x114)
#define ODR4 TO_REG(0x118)
#define STR4 TO_REG(0x11C)
enum aspeed_kcs_channel_id {
kcs_channel_1 = 0,
kcs_channel_2,
kcs_channel_3,
kcs_channel_4,
};
static const enum aspeed_lpc_subdevice aspeed_kcs_subdevice_map[] = {
[kcs_channel_1] = aspeed_lpc_kcs_1,
[kcs_channel_2] = aspeed_lpc_kcs_2,
[kcs_channel_3] = aspeed_lpc_kcs_3,
[kcs_channel_4] = aspeed_lpc_kcs_4,
};
struct aspeed_kcs_channel {
enum aspeed_kcs_channel_id id;
int idr;
int odr;
int str;
};
static const struct aspeed_kcs_channel aspeed_kcs_channel_map[] = {
[kcs_channel_1] = {
.id = kcs_channel_1,
.idr = IDR1,
.odr = ODR1,
.str = STR1
},
[kcs_channel_2] = {
.id = kcs_channel_2,
.idr = IDR2,
.odr = ODR2,
.str = STR2
},
[kcs_channel_3] = {
.id = kcs_channel_3,
.idr = IDR3,
.odr = ODR3,
.str = STR3
},
[kcs_channel_4] = {
.id = kcs_channel_4,
.idr = IDR4,
.odr = ODR4,
.str = STR4
},
};
struct aspeed_kcs_register_data {
const char *name;
int reg;
const struct aspeed_kcs_channel *chan;
};
static const struct aspeed_kcs_register_data aspeed_kcs_registers[] = {
{
.name = "idr1",
.reg = IDR1,
.chan = &aspeed_kcs_channel_map[kcs_channel_1],
},
{
.name = "odr1",
.reg = ODR1,
.chan = &aspeed_kcs_channel_map[kcs_channel_1],
},
{
.name = "str1",
.reg = STR1,
.chan = &aspeed_kcs_channel_map[kcs_channel_1],
},
{
.name = "idr2",
.reg = IDR2,
.chan = &aspeed_kcs_channel_map[kcs_channel_2],
},
{
.name = "odr2",
.reg = ODR2,
.chan = &aspeed_kcs_channel_map[kcs_channel_2],
},
{
.name = "str2",
.reg = STR2,
.chan = &aspeed_kcs_channel_map[kcs_channel_2],
},
{
.name = "idr3",
.reg = IDR3,
.chan = &aspeed_kcs_channel_map[kcs_channel_3],
},
{
.name = "odr3",
.reg = ODR3,
.chan = &aspeed_kcs_channel_map[kcs_channel_3],
},
{
.name = "str3",
.reg = STR3,
.chan = &aspeed_kcs_channel_map[kcs_channel_3],
},
{
.name = "idr4",
.reg = IDR4,
.chan = &aspeed_kcs_channel_map[kcs_channel_4],
},
{
.name = "odr4",
.reg = ODR4,
.chan = &aspeed_kcs_channel_map[kcs_channel_4],
},
{
.name = "str4",
.reg = STR4,
.chan = &aspeed_kcs_channel_map[kcs_channel_4],
},
{ },
};
static const struct aspeed_kcs_register_data *
aspeed_kcs_get_register_data_by_name(const char *name)
{
const struct aspeed_kcs_register_data *pos = aspeed_kcs_registers;
while (pos->name) {
if (!strcmp(pos->name, name)) {
return pos;
}
pos++;
}
return NULL;
}
static const struct aspeed_kcs_channel *
aspeed_kcs_get_channel_by_register(int reg)
{
const struct aspeed_kcs_register_data *pos = aspeed_kcs_registers;
while (pos->name) {
if (pos->reg == reg) {
return pos->chan;
}
pos++;
}
return NULL;
}
static void aspeed_kcs_get_register_property(Object *obj,
Visitor *v,
const char *name,
void *opaque,
Error **errp)
{
const struct aspeed_kcs_register_data *data;
AspeedLPCState *s = ASPEED_LPC(obj);
uint32_t val;
data = aspeed_kcs_get_register_data_by_name(name);
if (!data) {
return;
}
if (!strncmp("odr", name, 3)) {
s->regs[data->chan->str] &= ~STR_OBF;
}
val = s->regs[data->reg];
visit_type_uint32(v, name, &val, errp);
}
static bool aspeed_kcs_channel_enabled(AspeedLPCState *s,
const struct aspeed_kcs_channel *channel)
{
switch (channel->id) {
case kcs_channel_1: return s->regs[HICR0] & HICR0_LPC1E;
case kcs_channel_2: return s->regs[HICR0] & HICR0_LPC2E;
case kcs_channel_3:
return (s->regs[HICR0] & HICR0_LPC3E) &&
(s->regs[HICR4] & HICR4_KCSENBL);
case kcs_channel_4: return s->regs[HICRB] & HICRB_LPC4E;
default: return false;
}
}
static bool
aspeed_kcs_channel_ibf_irq_enabled(AspeedLPCState *s,
const struct aspeed_kcs_channel *channel)
{
if (!aspeed_kcs_channel_enabled(s, channel)) {
return false;
}
switch (channel->id) {
case kcs_channel_1: return s->regs[HICR2] & HICR2_IBFIE1;
case kcs_channel_2: return s->regs[HICR2] & HICR2_IBFIE2;
case kcs_channel_3: return s->regs[HICR2] & HICR2_IBFIE3;
case kcs_channel_4: return s->regs[HICRB] & HICRB_IBFIE4;
default: return false;
}
}
static void aspeed_kcs_set_register_property(Object *obj,
Visitor *v,
const char *name,
void *opaque,
Error **errp)
{
const struct aspeed_kcs_register_data *data;
AspeedLPCState *s = ASPEED_LPC(obj);
uint32_t val;
data = aspeed_kcs_get_register_data_by_name(name);
if (!data) {
return;
}
if (!visit_type_uint32(v, name, &val, errp)) {
return;
}
if (strncmp("str", name, 3)) {
s->regs[data->reg] = val;
}
if (!strncmp("idr", name, 3)) {
s->regs[data->chan->str] |= STR_IBF;
if (aspeed_kcs_channel_ibf_irq_enabled(s, data->chan)) {
enum aspeed_lpc_subdevice subdev;
subdev = aspeed_kcs_subdevice_map[data->chan->id];
qemu_irq_raise(s->subdevice_irqs[subdev]);
}
}
}
static void aspeed_lpc_set_irq(void *opaque, int irq, int level)
{
AspeedLPCState *s = (AspeedLPCState *)opaque;
if (level) {
s->subdevice_irqs_pending |= BIT(irq);
} else {
s->subdevice_irqs_pending &= ~BIT(irq);
}
qemu_set_irq(s->irq, !!s->subdevice_irqs_pending);
}
static uint64_t aspeed_lpc_read(void *opaque, hwaddr offset, unsigned size)
{
AspeedLPCState *s = ASPEED_LPC(opaque);
int reg = TO_REG(offset);
if (reg >= ARRAY_SIZE(s->regs)) {
qemu_log_mask(LOG_GUEST_ERROR,
"%s: Out-of-bounds read at offset 0x%" HWADDR_PRIx "\n",
__func__, offset);
return 0;
}
switch (reg) {
case IDR1:
case IDR2:
case IDR3:
case IDR4:
{
const struct aspeed_kcs_channel *channel;
channel = aspeed_kcs_get_channel_by_register(reg);
if (s->regs[channel->str] & STR_IBF) {
enum aspeed_lpc_subdevice subdev;
subdev = aspeed_kcs_subdevice_map[channel->id];
qemu_irq_lower(s->subdevice_irqs[subdev]);
}
s->regs[channel->str] &= ~STR_IBF;
break;
}
default:
break;
}
return s->regs[reg];
}
static void aspeed_lpc_write(void *opaque, hwaddr offset, uint64_t data,
unsigned int size)
{
AspeedLPCState *s = ASPEED_LPC(opaque);
int reg = TO_REG(offset);
if (reg >= ARRAY_SIZE(s->regs)) {
qemu_log_mask(LOG_GUEST_ERROR,
"%s: Out-of-bounds write at offset 0x%" HWADDR_PRIx "\n",
__func__, offset);
return;
}
switch (reg) {
case ODR1:
case ODR2:
case ODR3:
case ODR4:
s->regs[aspeed_kcs_get_channel_by_register(reg)->str] |= STR_OBF;
break;
default:
break;
}
s->regs[reg] = data;
}
static const MemoryRegionOps aspeed_lpc_ops = {
.read = aspeed_lpc_read,
.write = aspeed_lpc_write,
.endianness = DEVICE_LITTLE_ENDIAN,
.valid = {
.min_access_size = 1,
.max_access_size = 4,
},
};
static void aspeed_lpc_reset(DeviceState *dev)
{
struct AspeedLPCState *s = ASPEED_LPC(dev);
s->subdevice_irqs_pending = 0;
memset(s->regs, 0, sizeof(s->regs));
s->regs[HICR7] = s->hicr7;
}
static void aspeed_lpc_realize(DeviceState *dev, Error **errp)
{
AspeedLPCState *s = ASPEED_LPC(dev);
SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
sysbus_init_irq(sbd, &s->irq);
sysbus_init_irq(sbd, &s->subdevice_irqs[aspeed_lpc_kcs_1]);
sysbus_init_irq(sbd, &s->subdevice_irqs[aspeed_lpc_kcs_2]);
sysbus_init_irq(sbd, &s->subdevice_irqs[aspeed_lpc_kcs_3]);
sysbus_init_irq(sbd, &s->subdevice_irqs[aspeed_lpc_kcs_4]);
sysbus_init_irq(sbd, &s->subdevice_irqs[aspeed_lpc_ibt]);
memory_region_init_io(&s->iomem, OBJECT(s), &aspeed_lpc_ops, s,
TYPE_ASPEED_LPC, 0x1000);
sysbus_init_mmio(sbd, &s->iomem);
qdev_init_gpio_in(dev, aspeed_lpc_set_irq, ASPEED_LPC_NR_SUBDEVS);
}
static void aspeed_lpc_init(Object *obj)
{
object_property_add(obj, "idr1", "uint32", aspeed_kcs_get_register_property,
aspeed_kcs_set_register_property, NULL, NULL);
object_property_add(obj, "odr1", "uint32", aspeed_kcs_get_register_property,
aspeed_kcs_set_register_property, NULL, NULL);
object_property_add(obj, "str1", "uint32", aspeed_kcs_get_register_property,
aspeed_kcs_set_register_property, NULL, NULL);
object_property_add(obj, "idr2", "uint32", aspeed_kcs_get_register_property,
aspeed_kcs_set_register_property, NULL, NULL);
object_property_add(obj, "odr2", "uint32", aspeed_kcs_get_register_property,
aspeed_kcs_set_register_property, NULL, NULL);
object_property_add(obj, "str2", "uint32", aspeed_kcs_get_register_property,
aspeed_kcs_set_register_property, NULL, NULL);
object_property_add(obj, "idr3", "uint32", aspeed_kcs_get_register_property,
aspeed_kcs_set_register_property, NULL, NULL);
object_property_add(obj, "odr3", "uint32", aspeed_kcs_get_register_property,
aspeed_kcs_set_register_property, NULL, NULL);
object_property_add(obj, "str3", "uint32", aspeed_kcs_get_register_property,
aspeed_kcs_set_register_property, NULL, NULL);
object_property_add(obj, "idr4", "uint32", aspeed_kcs_get_register_property,
aspeed_kcs_set_register_property, NULL, NULL);
object_property_add(obj, "odr4", "uint32", aspeed_kcs_get_register_property,
aspeed_kcs_set_register_property, NULL, NULL);
object_property_add(obj, "str4", "uint32", aspeed_kcs_get_register_property,
aspeed_kcs_set_register_property, NULL, NULL);
}
static const VMStateDescription vmstate_aspeed_lpc = {
.name = TYPE_ASPEED_LPC,
.version_id = 2,
.minimum_version_id = 2,
.fields = (VMStateField[]) {
VMSTATE_UINT32_ARRAY(regs, AspeedLPCState, ASPEED_LPC_NR_REGS),
VMSTATE_UINT32(subdevice_irqs_pending, AspeedLPCState),
VMSTATE_END_OF_LIST(),
}
};
static Property aspeed_lpc_properties[] = {
DEFINE_PROP_UINT32("hicr7", AspeedLPCState, hicr7, 0),
DEFINE_PROP_END_OF_LIST(),
};
static void aspeed_lpc_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->realize = aspeed_lpc_realize;
dc->reset = aspeed_lpc_reset;
dc->desc = "Aspeed LPC Controller",
dc->vmsd = &vmstate_aspeed_lpc;
device_class_set_props(dc, aspeed_lpc_properties);
}
static const TypeInfo aspeed_lpc_info = {
.name = TYPE_ASPEED_LPC,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(AspeedLPCState),
.class_init = aspeed_lpc_class_init,
.instance_init = aspeed_lpc_init,
};
static void aspeed_lpc_register_types(void)
{
type_register_static(&aspeed_lpc_info);
}
type_init(aspeed_lpc_register_types);
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