isa: add an ISA DMA interface, and store it within the ISA bus

This will permit to deprecate global DMA_*() functions.

Signed-off-by: Hervé Poussineau <hpoussin@reactos.org>
Message-id: 1453843944-26833-11-git-send-email-hpoussin@reactos.org
Signed-off-by: John Snow <jsnow@redhat.com>

hw/isa/isa-bus.c

@@ -37,6 +37,12 @@ static void isa_bus_class_init(ObjectClass *klass, void *data)
     k->get_fw_dev_path = isabus_get_fw_dev_path;
 }
 
+static const TypeInfo isa_dma_info = {
+    .name = TYPE_ISADMA,
+    .parent = TYPE_INTERFACE,
+    .class_size = sizeof(IsaDmaClass),
+};
+
 static const TypeInfo isa_bus_info = {
     .name = TYPE_ISA_BUS,
     .parent = TYPE_BUS,
@@ -90,6 +96,20 @@ void isa_init_irq(ISADevice *dev, qemu_irq *p, int isairq)
     dev->nirqs++;
 }
 
+void isa_bus_dma(ISABus *bus, IsaDma *dma8, IsaDma *dma16)
+{
+    assert(bus && dma8 && dma16);
+    assert(!bus->dma[0] && !bus->dma[1]);
+    bus->dma[0] = dma8;
+    bus->dma[1] = dma16;
+}
+
+IsaDma *isa_get_dma(ISABus *bus, int nchan)
+{
+    assert(bus);
+    return bus->dma[nchan > 3 ? 1 : 0];
+}
+
 static inline void isa_init_ioport(ISADevice *dev, uint16_t ioport)
 {
     if (dev && (dev->ioport_id == 0 || ioport < dev->ioport_id)) {
@@ -223,6 +243,7 @@ static const TypeInfo isa_device_type_info = {
 
 static void isabus_register_types(void)
 {
+    type_register_static(&isa_dma_info);
     type_register_static(&isa_bus_info);
     type_register_static(&isabus_bridge_info);
     type_register_static(&isa_device_type_info);

include/hw/isa/isa.h

@@ -34,6 +34,41 @@ static inline uint16_t applesmc_port(void)
     return 0;
 }
 
+#define TYPE_ISADMA "isa-dma"
+
+#define ISADMA_CLASS(klass) \
+    OBJECT_CLASS_CHECK(IsaDmaClass, (klass), TYPE_ISADMA)
+#define ISADMA_GET_CLASS(obj) \
+    OBJECT_GET_CLASS(IsaDmaClass, (obj), TYPE_ISADMA)
+#define ISADMA(obj) \
+    INTERFACE_CHECK(IsaDma, (obj), TYPE_ISADMA)
+
+struct IsaDma {
+    Object parent;
+};
+
+typedef enum {
+    ISADMA_TRANSFER_VERIFY,
+    ISADMA_TRANSFER_READ,
+    ISADMA_TRANSFER_WRITE,
+    ISADMA_TRANSFER_ILLEGAL,
+} IsaDmaTransferMode;
+
+typedef struct IsaDmaClass {
+    InterfaceClass parent;
+
+    IsaDmaTransferMode (*get_transfer_mode)(IsaDma *obj, int nchan);
+    bool (*has_autoinitialization)(IsaDma *obj, int nchan);
+    int (*read_memory)(IsaDma *obj, int nchan, void *buf, int pos, int len);
+    int (*write_memory)(IsaDma *obj, int nchan, void *buf, int pos, int len);
+    void (*hold_DREQ)(IsaDma *obj, int nchan);
+    void (*release_DREQ)(IsaDma *obj, int nchan);
+    void (*schedule)(IsaDma *obj);
+    void (*register_channel)(IsaDma *obj, int nchan,
+                             DMA_transfer_handler transfer_handler,
+                             void *opaque);
+} IsaDmaClass;
+
 typedef struct ISADeviceClass {
     DeviceClass parent_class;
 } ISADeviceClass;
@@ -46,6 +81,7 @@ struct ISABus {
     MemoryRegion *address_space;
     MemoryRegion *address_space_io;
     qemu_irq *irqs;
+    IsaDma *dma[2];
 };
 
 struct ISADevice {
@@ -63,6 +99,8 @@ ISABus *isa_bus_new(DeviceState *dev, MemoryRegion *address_space,
 void isa_bus_irqs(ISABus *bus, qemu_irq *irqs);
 qemu_irq isa_get_irq(ISADevice *dev, int isairq);
 void isa_init_irq(ISADevice *dev, qemu_irq *p, int isairq);
+void isa_bus_dma(ISABus *bus, IsaDma *dma8, IsaDma *dma16);
+IsaDma *isa_get_dma(ISABus *bus, int nchan);
 MemoryRegion *isa_address_space(ISADevice *dev);
 MemoryRegion *isa_address_space_io(ISADevice *dev);
 ISADevice *isa_create(ISABus *bus, const char *name);

include/qemu/typedefs.h

@@ -33,6 +33,7 @@ typedef struct I2CBus I2CBus;
 typedef struct I2SCodec I2SCodec;
 typedef struct ISABus ISABus;
 typedef struct ISADevice ISADevice;
+typedef struct IsaDma IsaDma;
 typedef struct LoadStateEntry LoadStateEntry;
 typedef struct MACAddr MACAddr;
 typedef struct MachineClass MachineClass;