hw/m68k: add a dummy SWIM floppy controller

SWIM (Sander-Wozniak Integrated Machine) is the floppy controller of
the 680x0 Macintosh.

This patch introduces only the basic support: it allows to switch from
IWM (Integrated WOZ Machine) mode to the SWIM mode and makes the linux
driver happy.

It cannot read any floppy image.

Co-developed-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Reviewed-by: Hervé Poussineau <hpoussin@reactos.org>
Message-Id: <20191026164546.30020-10-laurent@vivier.eu>

1 files changed, 76 insertions, 0 deletions

diff --git a/include/hw/block/swim.h b/include/hw/block/swim.h
new file mode 100644
index 0000000000..6add3499d0
--- /dev/null
+++ b/include/hw/block/swim.h
@@ -0,0 +1,76 @@
+/*
+ * QEMU Macintosh floppy disk controller emulator (SWIM)
+ *
+ * Copyright (c) 2014-2018 Laurent Vivier <laurent@vivier.eu>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2.  See
+ * the COPYING file in the top-level directory.
+ *
+ */
+
+#ifndef SWIM_H
+#define SWIM_H
+
+#include "qemu/osdep.h"
+#include "hw/sysbus.h"
+
+#define SWIM_MAX_FD            2
+
+typedef struct SWIMDrive SWIMDrive;
+typedef struct SWIMBus SWIMBus;
+typedef struct SWIMCtrl SWIMCtrl;
+
+#define TYPE_SWIM_DRIVE "swim-drive"
+#define SWIM_DRIVE(obj) OBJECT_CHECK(SWIMDrive, (obj), TYPE_SWIM_DRIVE)
+
+struct SWIMDrive {
+    DeviceState qdev;
+    int32_t     unit;
+    BlockConf   conf;
+};
+
+#define TYPE_SWIM_BUS "swim-bus"
+#define SWIM_BUS(obj) OBJECT_CHECK(SWIMBus, (obj), TYPE_SWIM_BUS)
+
+struct SWIMBus {
+    BusState bus;
+    struct SWIMCtrl *ctrl;
+};
+
+typedef struct FDrive {
+    SWIMCtrl *swimctrl;
+    BlockBackend *blk;
+    BlockConf *conf;
+} FDrive;
+
+struct SWIMCtrl {
+    MemoryRegion iomem;
+    FDrive drives[SWIM_MAX_FD];
+    int mode;
+    /* IWM mode */
+    int iwm_switch;
+    uint16_t regs[8];
+#define IWM_PH0   0
+#define IWM_PH1   1
+#define IWM_PH2   2
+#define IWM_PH3   3
+#define IWM_MTR   4
+#define IWM_DRIVE 5
+#define IWM_Q6    6
+#define IWM_Q7    7
+    uint8_t iwm_data;
+    uint8_t iwm_mode;
+    /* SWIM mode */
+    uint8_t swim_phase;
+    uint8_t swim_mode;
+    SWIMBus bus;
+};
+
+#define TYPE_SWIM "swim"
+#define SWIM(obj) OBJECT_CHECK(SWIM, (obj), TYPE_SWIM)
+
+typedef struct SWIM {
+    SysBusDevice parent_obj;
+    SWIMCtrl     ctrl;
+} SWIM;
+#endif