[Qemu-devel] Re: [PATCH] Sparc32/PPC: convert escc to qdev

[Blue Swirl <blauwirbel@gmail.com>]

On 7/14/09, Juan Quintela <quintela@trasno.org> wrote:
> Blue Swirl <blauwirbel@gmail.com> wrote:
>  > Hi,
>  >
>  > This patch would convert escc to qdev. Sparc32 works fine, but there
>  > is a problem with PPC, it crashes when the device is remapped by
>  > macio.c.
>  > Any ideas?
>
>
> From my ignorance:
>
>
>  > -        s->chn[i].chn = 1 - i;
>  > -        s->chn[i].type = ser;
>  > -        s->chn[i].clock = clock / 2;
>
>  clock = clock /2
>
>  > -        if (s->chn[i].chr) {
>  > -            qemu_chr_add_handlers(s->chn[i].chr, serial_can_receive,
>  > -                                  serial_receive1, serial_event, &s->chn[i]);
>  > -        }
>  > +    DeviceState *dev;
>  > +    SysBusDevice *s;
>  > +
>  > +    dev = qdev_create(NULL, "escc");
>  > +    qdev_set_prop_int(dev, "disabled", 0);
>  > +    qdev_set_prop_int(dev, "frequency", clock);
>
>
> we set frequency with clock value (notice not clock/2)
>
>
>  > +    qdev_set_prop_int(dev, "it_shift", it_shift);
>  > +    qdev_set_prop_ptr(dev, "chrB", chrB);
>  > +    qdev_set_prop_ptr(dev, "chrA", chrA);
>  > +    qdev_set_prop_int(dev, "chnBtype", ser);
>  > +    qdev_set_prop_int(dev, "chnAtype", ser);
>  > +    qdev_init(dev);
>  > +    s = sysbus_from_qdev(dev);
>  > +    sysbus_connect_irq(s, 0, irqA);
>  > +    sysbus_connect_irq(s, 1, irqB);
>  > +    if (base) {
>  > +        sysbus_mmio_map(s, 0, base);
>  >      }
>  > -    s->chn[0].otherchn = &s->chn[1];
>  > -    s->chn[1].otherchn = &s->chn[0];
>  > -    if (base)
>  > -        register_savevm("escc", base, 2, escc_save, escc_load, s);
>  > -    else
>  > -        register_savevm("escc", -1, 2, escc_save, escc_load, s);
>  > -    qemu_register_reset(escc_reset, s);
>  > -    escc_reset(s);
>  > -    return escc_io_memory;
>  > +
>  > +    return s;
>  >  }
>  >
>  >  static const uint8_t keycodes[128] = {
>  > @@ -903,35 +888,86 @@ static void sunmouse_event(void *opaque,
>  >  void slavio_serial_ms_kbd_init(target_phys_addr_t base, qemu_irq irq,
>  >                                 int disabled, int clock, int it_shift)
>  >  {
>  > -    int slavio_serial_io_memory, i;
>  > -    SerialState *s;
>  > -
>  > -    s = qemu_mallocz(sizeof(SerialState));
>  > +    DeviceState *dev;
>  > +    SysBusDevice *s;
>  > +
>  > +    dev = qdev_create(NULL, "escc");
>  > +    qdev_set_prop_int(dev, "disabled", disabled);
>  > +    qdev_set_prop_int(dev, "frequency", clock);
>
>
> We set frequency with clock value (not clock/2 either)
>
>
>  > +    qdev_set_prop_int(dev, "it_shift", it_shift);
>  > +    qdev_set_prop_ptr(dev, "chrB", NULL);
>  > +    qdev_set_prop_ptr(dev, "chrA", NULL);
>  > +    qdev_set_prop_int(dev, "chnBtype", mouse);
>  > +    qdev_set_prop_int(dev, "chnAtype", kbd);
>  > +    qdev_init(dev);
>  > +    s = sysbus_from_qdev(dev);
>  > +    sysbus_connect_irq(s, 0, irq);
>  > +    sysbus_connect_irq(s, 1, irq);
>  > +    sysbus_mmio_map(s, 0, base);
>  > +}
>  >
>  > -    s->it_shift = it_shift;
>  > +static void escc_init1(SysBusDevice *dev)
>  > +{
>  > +    SerialState *s = FROM_SYSBUS(SerialState, dev);
>  > +    int io;
>  > +    unsigned int i;
>  > +    uint32_t clock, disabled;
>  > +
>  > +    s->it_shift = qdev_get_prop_int(&dev->qdev, "it_shift", 0);
>  > +    clock = qdev_get_prop_int(&dev->qdev, "clock", 0);
>
>
> We get in clock the "clock" value not the "frequency" one, and no hint
>  of the /2

The division is performed a few lines later. Actually we should do the
division in compile time, the numbers are fixed constants.

> > +    .qdev.props = (DevicePropList[]) {
>  > +        {.name = "frequency", .type = PROP_TYPE_INT},
>
>
> It is really called "frequency".

I don't know, it's the crystal frequency for serial baud rate
generator, different for PPC and Sparc. The property is not visible in
OpenFirmware tree so we can pick up any name. Timer speeds are often
exported with "clock-frequency" property, maybe that's more
consistent.