m68k: Add serial controller to the NeXTcube machine

The NeXTcube uses a normal 8530 serial controller, so we can simply use
our normal "escc" device here.
While we're at it, also add a boot-serial-test for the next-cube machine,
now that the serial output works.

Tested-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20190831074519.32613-6-huth@tuxfamily.org>
Signed-off-by: Thomas Huth <huth@tuxfamily.org>

hw/m68k/Kconfig

@@ -11,3 +11,4 @@ config MCF5208
 config NEXTCUBE
     bool
     select FRAMEBUFFER
+    select ESCC

hw/m68k/next-cube.c

@@ -10,11 +10,12 @@
  */
 
 #include "qemu/osdep.h"
+#include "cpu.h"
 #include "exec/hwaddr.h"
 #include "exec/address-spaces.h"
 #include "sysemu/sysemu.h"
 #include "sysemu/qtest.h"
-#include "hw/hw.h"
+#include "hw/irq.h"
 #include "hw/m68k/next-cube.h"
 #include "hw/boards.h"
 #include "hw/loader.h"
@@ -22,6 +23,7 @@
 #include "hw/sysbus.h"
 #include "hw/char/escc.h" /* ZILOG 8530 Serial Emulation */
 #include "hw/block/fdc.h"
+#include "hw/qdev-properties.h"
 #include "qapi/error.h"
 #include "ui/console.h"
 #include "target/m68k/cpu.h"
@@ -815,6 +817,39 @@ void next_irq(void *opaque, int number, int level)
     }
 }
 
+static void next_serial_irq(void *opaque, int n, int level)
+{
+    /* DPRINTF("SCC IRQ NUM %i\n",n); */
+    if (n) {
+        next_irq(opaque, NEXT_SCC_DMA_I, level);
+    } else {
+        next_irq(opaque, NEXT_SCC_I, level);
+    }
+}
+
+static void next_escc_init(M68kCPU *cpu)
+{
+    qemu_irq *ser_irq = qemu_allocate_irqs(next_serial_irq, cpu, 2);
+    DeviceState *dev;
+    SysBusDevice *s;
+
+    dev = qdev_create(NULL, TYPE_ESCC);
+    qdev_prop_set_uint32(dev, "disabled", 0);
+    qdev_prop_set_uint32(dev, "frequency", 9600 * 384);
+    qdev_prop_set_uint32(dev, "it_shift", 0);
+    qdev_prop_set_bit(dev, "bit_swap", true);
+    qdev_prop_set_chr(dev, "chrB", serial_hd(1));
+    qdev_prop_set_chr(dev, "chrA", serial_hd(0));
+    qdev_prop_set_uint32(dev, "chnBtype", escc_serial);
+    qdev_prop_set_uint32(dev, "chnAtype", escc_serial);
+    qdev_init_nofail(dev);
+
+    s = SYS_BUS_DEVICE(dev);
+    sysbus_connect_irq(s, 0, ser_irq[0]);
+    sysbus_connect_irq(s, 1,  ser_irq[1]);
+    sysbus_mmio_map(s, 0, 0x2118000);
+}
+
 static void next_cube_init(MachineState *machine)
 {
     M68kCPU *cpu;
@@ -906,8 +941,10 @@ static void next_cube_init(MachineState *machine)
         }
     }
 
-    /* TODO: */
     /* Serial */
+    next_escc_init(cpu);
+
+    /* TODO: */
     /* Network */
     /* SCSI */
 

tests/boot-serial-test.c

@@ -24,6 +24,17 @@ static const uint8_t kernel_mcf5208[] = {
     0x60, 0xfa                              /* bra.s  loop */
 };
 
+static const uint8_t bios_nextcube[] = {
+    0x06, 0x00, 0x00, 0x00,                 /* Initial SP */
+    0x01, 0x00, 0x00, 0x08,                 /* Initial PC */
+    0x41, 0xf9, 0x02, 0x11, 0x80, 0x00,     /* lea 0x02118000,%a0 */
+    0x10, 0x3c, 0x00, 0x54,                 /* move.b #'T',%d0 */
+    0x11, 0x7c, 0x00, 0x05, 0x00, 0x01,     /* move.b #5,1(%a0)    Sel TXCTRL */
+    0x11, 0x7c, 0x00, 0x68, 0x00, 0x01,     /* move.b #0x68,1(%a0) Enable TX */
+    0x11, 0x40, 0x00, 0x03,                 /* move.b %d0,3(%a0)   Print 'T' */
+    0x60, 0xfa                              /* bra.s  loop */
+};
+
 static const uint8_t kernel_pls3adsp1800[] = {
     0xb0, 0x00, 0x84, 0x00,                 /* imm   0x8400 */
     0x30, 0x60, 0x00, 0x04,                 /* addik r3,r0,4 */
@@ -117,6 +128,7 @@ static testdef_t tests[] = {
     { "sparc64", "sun4u", "", "UltraSPARC" },
     { "s390x", "s390-ccw-virtio", "", "device" },
     { "m68k", "mcf5208evb", "", "TT", sizeof(kernel_mcf5208), kernel_mcf5208 },
+    { "m68k", "next-cube", "", "TT", sizeof(bios_nextcube), 0, bios_nextcube },
     { "microblaze", "petalogix-s3adsp1800", "", "TT",
       sizeof(kernel_pls3adsp1800), kernel_pls3adsp1800 },
     { "microblazeel", "petalogix-ml605", "", "TT",