[SeaBIOS] [Qemu-devel] [RFC][PATCH 2/2] hw: add Embedded Controller chip emulation

li guang lig.fnst at cn.fujitsu.com
Thu Apr 18 02:23:34 CEST 2013


在 2013-04-17三的 19:54 +0200,Andreas Färber写道:
> Am 17.04.2013 09:23, schrieb liguang:
> > this work implemented Embedded Controller chip emulation
> > which was defined at ACPI SEPC v5 chapter 12:
> > "ACPI Embedded Controller Interface Specification"
> > 
> > commonly Embedded Controller will emulate keyboard,
> > mouse, handle ACPI defined operations and some
> > low-speed devices like SMbus.
> > 
> > Signed-off-by: liguang <lig.fnst at cn.fujitsu.com>
> > ---
> >  hw/ec.c |  113 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> 
> hw/misc/ec.c? hw/i386/ec.c? Not directly in hw/ anymore.
> 
> >  hw/ec.h |   20 +++++++++++
> >  2 files changed, 133 insertions(+), 0 deletions(-)
> >  create mode 100644 hw/ec.c
> >  create mode 100644 hw/ec.h
> > 
> > diff --git a/hw/ec.c b/hw/ec.c
> > new file mode 100644
> > index 0000000..69c92cf
> > --- /dev/null
> > +++ b/hw/ec.c
> > @@ -0,0 +1,113 @@
> > +#include "ec.h"
> > +#include "hw/hw.h"
> > +#include "hw/isa/isa.h"
> > +#include "sysemu/sysemu.h"
> > +
> > +#define TYPE_EC_DEV
> 
> Missing string value.
> 
> > +#define EC_DEV(obj) \
> > +    OBJECT_CHECK(ECState, (obj), TYPE_EC_DEV)
> > +
> > +static char ec_acpi_space[EC_ACPI_SPACE_SIZE] = {0};
> > +
> > +typedef struct ECState {
> > +    ISADevice dev;
> 
> parent_obj and white line please.
> 
> > +    char cmd;
> > +    char status;
> > +    char data;
> > +    char irq;
> > +    char buf;
> 
> char seems a bit unsafe here, since it might be signed or unsigned.
> Suggest uint8_t.
> 
> > +    MemoryRegion io;
> > +} ECState;
> > +
> > +
> > +static void io62_write(void *opaque, hwaddr addr, uint64_t val, unsigned size)
> > +{
> > +    ECState *s = opaque;
> > +    char tmp = val & 0xff;
> > +
> > +    if (s->status & EC_ACPI_CMD) {
> > +        s->buf = tmp;
> > +        s->status &= ~EC_ACPI_CMD;
> > +    } else {
> > +        if (tmp < EC_ACPI_SPACE_SIZE) {
> > +            ec_acpi_space[s->buf] = tmp;
> > +        }
> > +    }
> > +}
> > +
> > +static uint64_t io62_read(void *opaque, hwaddr addr, unsigned size)
> > +{
> > +    return s->data;
> > +}
> > +
> > +static void io66_write(void *opaque, hwaddr addr, uint64_t val, unsigned size)
> > +{
> > +    ECState *s = opaque;
> > +
> > +    s->status = EC_ACPI_CMD | EC_ACPI_IBF;
> > +
> > +    switch (val & 0xff) {
> > +    case EC_ACPI_CMD_READ:
> > +    case EC_ACPI_CMD_WRITE:
> > +    case EC_ACPI_CMD_BURST_EN:
> > +        s->statu |= EC_ACPI_BST;
> 
> s->status
> 
> > +    case EC_ACPI_CMD_BURST_DN:
> > +        s->statu &= ~EC_ACPI_BST;
> 
> s->status
> 
> > +    case EC_ACPI_CMD_QUERY:
> > +        s->cmd = val & 0xff;
> > +    case default:
> > +        break;
> > +    }
> > +}
> > +
> > +static uint64_t io66_read(void *opaque, hwaddr addr, unsigned size)
> > +{
> > +    ECState *s = opaque;
> > +
> > +    return s->status;
> > +}
> > +
> > +static const MemoryRegionOps io62_io_ops = {
> > +    .write = io62_write,
> > +    .read = io62_read,
> > +    .endianness = DEVICE_NATIVE_ENDIAN,
> > +    .impl = {
> > +        .min_access_size = 1,
> > +        .max_access_size = 1,
> > +    },
> > +};
> > +
> > +static const MemoryRegionOps io66_io_ops = {
> > +    .write = io66_write,
> > +    .read = io66_read,
> > +    .endianness = DEVICE_NATIVE_ENDIAN,
> > +    .impl = {
> > +        .min_access_size = 1,
> > +        .max_access_size = 1,
> > +    },
> > +};
> > +
> > +static void ec_realizefn(DeviceState *dev, Error **err)
> > +{
> > +    ISADevice *isadev = ISA_DEVICE(dev);
> > +    ECState *s = EC_DEV(dev);
> > +
> > +    isa_init_irq(isadev, &s->irq, 0xb);
> > +
> 
> > +    memory_region_init_io(&s->io, &io62_io_ops, NULL, "ec-acpi-data", 1);
> > +    isa_register_ioport(isadev, &s->io, 0x62);
> > +
> > +    memory_region_init_io(&s->io, &io66_io_ops, NULL, "ec-acpi-cmd", 1);
> > +    isa_register_ioport(isadev, &s->io, 0x66);
> 
> Since you are not defining any properties, all of this could go into a
> .instance_init function.
> 
> But I am glad to see a realize function being used. :)
> 
> > +
> > +    s->status = 0;
> > +    s->data = 0;
> 
> This is probably not necessary here, since all fields get
> zero-initialized. It should rather go into a reset function.
> 
> > +}
> > +
> > +static void ec_class_initfn(ObjectClass *klass, void *data)
> > +{
> > +    DeviceClass *dc = DEVICE_CLASS(klass);
> > +
> > +    dc->realize = ec_realizefn;
> > +    dc->no_user = 1;
> > +}
> 
> This file ends with an unused static function, it's missing type
> registration.

OK, will fix all,

Thanks you so much!

> 
> I figure this device should rather be a specific (real) model, reflected
> in a particular name, similar to how we have different watchdog devices
> rather than a "watchdog" device.

does it has to be specific model?
my reason to be generic like "generic-sdhci"(SD host controller) device
is mostly all EC devices play a similar role, and we do not have to
know the difference between EC chip from different vendors

> 
> > diff --git a/hw/ec.h b/hw/ec.h
> > new file mode 100644
> > index 0000000..110ce04
> > --- /dev/null
> > +++ b/hw/ec.h
> > @@ -0,0 +1,20 @@
> > +#inndef __EC_H
> 
> #ifndef and no leading underscores, please.
> 
> > +#define __EC_H
> > +
> > +#define EC_ACPI_SPACE_SIZE 0x80
> > +
> > +#define EC_ACPI_CMD_PORT 0x66
> > +#define EC_ACPI_DATA_PORT 0x62
> > +
> > +#define EC_ACPI_OBF 0x1
> > +#define EC_ACPI_IBF 0x2
> > +#define EC_ACPI_CMD 0x8
> > +#define EC_ACPI_BST 0x10
> > +
> > +#define EC_ACPI_CMD_READ 0x80
> > +#define EC_ACPI_CMD_WRITE 0x81
> > +#define EC_ACPI_BURST_EN 0x82
> > +#define EC_ACPI_BURST_DN 0x83
> > +#define EC_ACPI_CMD_QUERY 0x84
> > +
> > +#endif
> 
> Regards,
> Andreas
> 





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