realview: break out versatile i2c controller code

The versatile i2c controller implementation was separated to
its own file called versatile_i2c.c. This is done as a preparation
for adding i2c support to the versatilepb board.

Signed-off-by: Oskar Andero <oskar.andero@gmail.com>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 105 insertions, 0 deletions

diff --git a/hw/versatile_i2c.c b/hw/versatile_i2c.c
new file mode 100644
index 0000000000..88f530aefc
--- /dev/null
+++ b/hw/versatile_i2c.c
@@ -0,0 +1,105 @@
+/*
+ * ARM Versatile I2C controller
+ *
+ * Copyright (c) 2006-2007 CodeSourcery.
+ * Copyright (c) 2012 Oskar Andero <oskar.andero@gmail.com>
+ *
+ * This file is derived from hw/realview.c by Paul Brook
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "sysbus.h"
+#include "bitbang_i2c.h"
+
+typedef struct {
+    SysBusDevice busdev;
+    MemoryRegion iomem;
+    bitbang_i2c_interface *bitbang;
+    int out;
+    int in;
+} VersatileI2CState;
+
+static uint64_t versatile_i2c_read(void *opaque, target_phys_addr_t offset,
+                                   unsigned size)
+{
+    VersatileI2CState *s = (VersatileI2CState *)opaque;
+
+    if (offset == 0) {
+        return (s->out & 1) | (s->in << 1);
+    } else {
+        hw_error("%s: Bad offset 0x%x\n", __func__, (int)offset);
+        return -1;
+    }
+}
+
+static void versatile_i2c_write(void *opaque, target_phys_addr_t offset,
+                                uint64_t value, unsigned size)
+{
+    VersatileI2CState *s = (VersatileI2CState *)opaque;
+
+    switch (offset) {
+    case 0:
+        s->out |= value & 3;
+        break;
+    case 4:
+        s->out &= ~value;
+        break;
+    default:
+        hw_error("%s: Bad offset 0x%x\n", __func__, (int)offset);
+    }
+    bitbang_i2c_set(s->bitbang, BITBANG_I2C_SCL, (s->out & 1) != 0);
+    s->in = bitbang_i2c_set(s->bitbang, BITBANG_I2C_SDA, (s->out & 2) != 0);
+}
+
+static const MemoryRegionOps versatile_i2c_ops = {
+    .read = versatile_i2c_read,
+    .write = versatile_i2c_write,
+    .endianness = DEVICE_NATIVE_ENDIAN,
+};
+
+static int versatile_i2c_init(SysBusDevice *dev)
+{
+    VersatileI2CState *s = FROM_SYSBUS(VersatileI2CState, dev);
+    i2c_bus *bus;
+
+    bus = i2c_init_bus(&dev->qdev, "i2c");
+    s->bitbang = bitbang_i2c_init(bus);
+    memory_region_init_io(&s->iomem, &versatile_i2c_ops, s,
+                          "versatile_i2c", 0x1000);
+    sysbus_init_mmio(dev, &s->iomem);
+    return 0;
+}
+
+static void versatile_i2c_class_init(ObjectClass *klass, void *data)
+{
+    SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
+
+    k->init = versatile_i2c_init;
+}
+
+static const TypeInfo versatile_i2c_info = {
+    .name          = "versatile_i2c",
+    .parent        = TYPE_SYS_BUS_DEVICE,
+    .instance_size = sizeof(VersatileI2CState),
+    .class_init    = versatile_i2c_class_init,
+};
+
+static void versatile_i2c_register_types(void)
+{
+    type_register_static(&versatile_i2c_info);
+}
+
+type_init(versatile_i2c_register_types)