Re: [Qemu-devel] [PATCH v4 2/8] ARM: ACPI: Add GPIO controller in ACPI DSDT table

[Igor Mammedov]

On Thu, 10 Dec 2015 13:16:22 -0600
Wei Huang <address@hidden> wrote:

> 
> 
> On 12/10/2015 07:22 AM, Igor Mammedov wrote:
> > On Mon, 7 Dec 2015 15:39:46 +0800
> > Shannon Zhao <address@hidden> wrote:
> > 
> >> From: Shannon Zhao <address@hidden>
> >>
> >> Add GPIO controller in ACPI DSDT table. It can be used for gpio
> >> event.
> >>
> >> Signed-off-by: Shannon Zhao <address@hidden>
> >> Signed-off-by: Shannon Zhao <address@hidden>
> >> Tested-by: Wei Huang <address@hidden>
> >> ---
> >>  hw/arm/virt-acpi-build.c | 19 +++++++++++++++++++
> >>  1 file changed, 19 insertions(+)
> >>
> >> diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c
> >> index 3c2c5d6..bf6b934 100644
> >> --- a/hw/arm/virt-acpi-build.c
> >> +++ b/hw/arm/virt-acpi-build.c
> >> @@ -323,6 +323,23 @@ static void acpi_dsdt_add_pci(Aml *scope,
> >> const MemMapEntry *memmap, int irq, aml_append(scope, dev);
> >>  }
> >>  
> >> +static void acpi_dsdt_add_gpio(Aml *scope, const MemMapEntry
> >> *gpio_memmap,
> >> +                                           int gpio_irq)
> > s/int/uint32_t/
> > 
> >> +{
> >> +    Aml *dev = aml_device("GPO0");
> >> +    aml_append(dev, aml_name_decl("_HID",
> >> aml_string("ARMH0061")));
> > What spec "ARMH0061" comes from?
> > Probably it should be mentioned in comment.
> 
> I tried to find the official source for this definition several weeks
> ago, but failed. Later, in private, Al Stone confirmed with me that
> ARMH0061 is the right one. Maybe ARM or Linaro should push this
> definition into ACPI spec or somewhere else in a formal way.
I've also tried and only saw it on lkml in mentioned patchset,
which wasn't warmly met.
Given that and lack of spec where it's allocated perhaps we should wait
on it till ARM puts in in some their spec formally.

> 
> > 
> >> +    aml_append(dev, aml_name_decl("_ADR", aml_int(0)));
> >> +    aml_append(dev, aml_name_decl("_UID", aml_int(0)));
> >> +
> >> +    Aml *crs = aml_resource_template();
> >> +    aml_append(crs, aml_memory32_fixed(gpio_memmap->base,
> >> gpio_memmap->size,
> >> +                                       AML_READ_WRITE));
> >> +    aml_append(crs, aml_interrupt(AML_CONSUMER, AML_LEVEL,
> >> AML_ACTIVE_HIGH,
> >> +                                  AML_EXCLUSIVE, gpio_irq));
> > that conflicts with
> > https://github.com/imammedo/qemu/commit/acb34e533bc31fdf3eb6230c93654b0b0ae4e76e
> > perhaps you could include it in your series and redo this hunk
> > to take array instead of int.
> > 
> > 
> >> +    aml_append(dev, aml_name_decl("_CRS", crs));
> >> +    aml_append(scope, dev);
> >> +}
> >> +
> >>  /* RSDP */
> >>  static GArray *
> >>  build_rsdp(GArray *rsdp_table, GArray *linker, unsigned rsdt)
> >> @@ -539,6 +556,8 @@ build_dsdt(GArray *table_data, GArray *linker,
> >> VirtGuestInfo *guest_info) (irqmap[VIRT_MMIO] + ARM_SPI_BASE),
> >> NUM_VIRTIO_TRANSPORTS); acpi_dsdt_add_pci(scope, memmap,
> >> (irqmap[VIRT_PCIE] + ARM_SPI_BASE), guest_info->use_highmem);
> >> +    acpi_dsdt_add_gpio(scope, &memmap[VIRT_GPIO],
> >> +                       (irqmap[VIRT_GPIO] + ARM_SPI_BASE));
> >>  
> >>      aml_append(dsdt, scope);
> >>  
> >