this work implemented Embedded Controller chip emulation
which was defined at ACPI SEPC v5 chapter 12:
"ACPI Embedded Controller Interface Specification"

commonly Embedded Controller will emulate keyboard,
mouse, handle ACPI defined operations and some
low-speed devices like SMbus.

Signed-off-by: liguang <lig.fnst@cn.fujitsu.com>
---
 hw/ec.c |  113 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 hw/ec.h |   20 +++++++++++
 2 files changed, 133 insertions(+), 0 deletions(-)
 create mode 100644 hw/ec.c
 create mode 100644 hw/ec.h

diff --git a/hw/ec.c b/hw/ec.c
new file mode 100644
index 0000000..69c92cf
--- /dev/null
+++ b/hw/ec.c
@@ -0,0 +1,113 @@
+#include "ec.h"
+#include "hw/hw.h"
+#include "hw/isa/isa.h"
+#include "sysemu/sysemu.h"
+
+#define TYPE_EC_DEV
+#define EC_DEV(obj) \
+    OBJECT_CHECK(ECState, (obj), TYPE_EC_DEV)
+
+static char ec_acpi_space[EC_ACPI_SPACE_SIZE] = {0};
+
+typedef struct ECState {
+    ISADevice dev;
+    char cmd;
+    char status;
+    char data;
+    char irq;
+    char buf;
+    MemoryRegion io;
+} ECState;
+
+
+static void io62_write(void *opaque, hwaddr addr, uint64_t val, unsigned size)
+{
+    ECState *s = opaque;
+    char tmp = val & 0xff;
+
+    if (s->status & EC_ACPI_CMD) {
+        s->buf = tmp;
+        s->status &= ~EC_ACPI_CMD;
+    } else {
+        if (tmp < EC_ACPI_SPACE_SIZE) {
+            ec_acpi_space[s->buf] = tmp;
+        }
+    }
+}
+
+static uint64_t io62_read(void *opaque, hwaddr addr, unsigned size)
+{
+    return s->data;
+}
+
+static void io66_write(void *opaque, hwaddr addr, uint64_t val, unsigned size)
+{
+    ECState *s = opaque;
+
+    s->status = EC_ACPI_CMD | EC_ACPI_IBF;
+
+    switch (val & 0xff) {
+    case EC_ACPI_CMD_READ:
+    case EC_ACPI_CMD_WRITE:
+    case EC_ACPI_CMD_BURST_EN:
+        s->statu |= EC_ACPI_BST;
+    case EC_ACPI_CMD_BURST_DN:
+        s->statu &= ~EC_ACPI_BST;
+    case EC_ACPI_CMD_QUERY:
+        s->cmd = val & 0xff;
+    case default:
+        break;
+    }
+}

+
+static uint64_t io66_read(void *opaque, hwaddr addr, unsigned size)
+{
+    ECState *s = opaque;
+
+    return s->status;
+}
+
+static const MemoryRegionOps io62_io_ops = {
+    .write = io62_write,
+    .read = io62_read,
+    .endianness = DEVICE_NATIVE_ENDIAN,
+    .impl = {
+        .min_access_size = 1,
+        .max_access_size = 1,
+    },
+};
+
+static const MemoryRegionOps io66_io_ops = {
+    .write = io66_write,
+    .read = io66_read,
+    .endianness = DEVICE_NATIVE_ENDIAN,
+    .impl = {
+        .min_access_size = 1,
+        .max_access_size = 1,
+    },
+};
+
+static void ec_realizefn(DeviceState *dev, Error **err)
+{
+    ISADevice *isadev = ISA_DEVICE(dev);
+    ECState *s = EC_DEV(dev);
+
+    isa_init_irq(isadev, &s->irq, 0xb);
+
+    memory_region_init_io(&s->io, &io62_io_ops, NULL, "ec-acpi-data", 1);
+    isa_register_ioport(isadev, &s->io, 0x62);
+
+    memory_region_init_io(&s->io, &io66_io_ops, NULL, "ec-acpi-cmd", 1);
+    isa_register_ioport(isadev, &s->io, 0x66);
+
+    s->status = 0;
+    s->data = 0;
+}
+
+static void ec_class_initfn(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+
+    dc->realize = ec_realizefn;
+    dc->no_user = 1;
+}
diff --git a/hw/ec.h b/hw/ec.h
new file mode 100644
index 0000000..110ce04
--- /dev/null
+++ b/hw/ec.h
@@ -0,0 +1,20 @@
+#inndef __EC_H
+#define __EC_H
+
+#define EC_ACPI_SPACE_SIZE 0x80
+
+#define EC_ACPI_CMD_PORT 0x66
+#define EC_ACPI_DATA_PORT 0x62
+
+#define EC_ACPI_OBF 0x1
+#define EC_ACPI_IBF 0x2
+#define EC_ACPI_CMD 0x8
+#define EC_ACPI_BST 0x10
+
+#define EC_ACPI_CMD_READ 0x80
+#define EC_ACPI_CMD_WRITE 0x81
+#define EC_ACPI_BURST_EN 0x82
+#define EC_ACPI_BURST_DN 0x83
+#define EC_ACPI_CMD_QUERY 0x84
+
+#endif
--
1.7.2.5


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