hppa: Fix serial port assignments and pass-through

This fixes the serial ports in the emulation to behave as on original
hardware.

On the real hardware, the LASI UART is serial port #0 and the DINO UART
is serial port #1. This is fixed in SeaBIOS-hppa firmware v6, which is
why at least this firmware version is required.

The serial port addresses in hppa/hppa_hardware.h have to be swapped,
and when creating the virtual serial ports the correct port addresses
are used.

This patch now for example allows to specify on the qemu command line:
     -serial mon:stdio -serial /dev/ttyS4
to use the emulated ttyS0 in the guest for console output, and pass
ttyS4 from the host to ttyS1 in the guest.

Signed-off-by: Helge Deller <deller@gmx.de>
Reviewed-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>

hw/hppa/hppa_hardware.h

@@ -41,8 +41,8 @@
 
 #define FW_CFG_IO_BASE  0xfffa0000
 
-#define PORT_SERIAL1    (DINO_UART_HPA + 0x800)
-#define PORT_SERIAL2    (LASI_UART_HPA + 0x800)
+#define PORT_SERIAL1    (LASI_UART_HPA + 0x800)
+#define PORT_SERIAL2    (DINO_UART_HPA + 0x800)
 
 #define HPPA_MAX_CPUS   16      /* max. number of SMP CPUs */
 #define CPU_CLOCK_MHZ   250     /* emulate a 250 MHz CPU */

hw/hppa/machine.c

@@ -32,7 +32,7 @@
 
 #define MAX_IDE_BUS 2
 
-#define MIN_SEABIOS_HPPA_VERSION 1 /* require at least this fw version */
+#define MIN_SEABIOS_HPPA_VERSION 6 /* require at least this fw version */
 
 #define HPA_POWER_BUTTON (FIRMWARE_END - 0x10)
 
@@ -236,20 +236,14 @@ static void machine_hppa_init(MachineState *machine)
     /* Realtime clock, used by firmware for PDC_TOD call. */
     mc146818_rtc_init(isa_bus, 2000, NULL);
 
-    /* Serial code setup.  */
-    if (serial_hd(0)) {
-        uint32_t addr = DINO_UART_HPA + 0x800;
-        serial_mm_init(addr_space, addr, 0,
-                       qdev_get_gpio_in(dino_dev, DINO_IRQ_RS232INT),
-                       115200, serial_hd(0), DEVICE_BIG_ENDIAN);
-    }
+    /* Serial ports: Lasi and Dino use a 7.272727 MHz clock. */
+    serial_mm_init(addr_space, LASI_UART_HPA + 0x800, 0,
+        qdev_get_gpio_in(lasi_dev, LASI_IRQ_UART_HPA), 7272727 / 16,
+        serial_hd(0), DEVICE_BIG_ENDIAN);
 
-    if (serial_hd(1)) {
-        /* Serial port */
-        serial_mm_init(addr_space, LASI_UART_HPA + 0x800, 0,
-                qdev_get_gpio_in(lasi_dev, LASI_IRQ_UART_HPA), 8000000 / 16,
-                serial_hd(1), DEVICE_BIG_ENDIAN);
-    }
+    serial_mm_init(addr_space, DINO_UART_HPA + 0x800, 0,
+        qdev_get_gpio_in(dino_dev, DINO_IRQ_RS232INT), 7272727 / 16,
+        serial_hd(1), DEVICE_BIG_ENDIAN);
 
     /* Parallel port */
     parallel_mm_init(addr_space, LASI_LPT_HPA + 0x800, 0,