pcnet: address TODOs

pcnet enables memory/io on init, which
does not make sense as BAR values are wrong.
Fix this, disabling BARs according to PCI spec.
Address other minor TODOs.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---

The following untested patch brings pcnet in
compliance with the spec.
Could someone who's interested in pcnet look
at this patch please?


 hw/pcnet.c |   17 ++---------------
 1 files changed, 2 insertions(+), 15 deletions(-)

Michael S. Tsirkin wrote:
> pcnet enables memory/io on init, which
> does not make sense as BAR values are wrong.
> Fix this, disabling BARs according to PCI spec.
> Address other minor TODOs.
> 
> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
> ---
> 
> The following untested patch brings pcnet in
> compliance with the spec.
> Could someone who's interested in pcnet look
> at this patch please?
> 

At least our special guest still works with your patch applied.

Tested-by: Jan Kiszka <jan.kiszka@siemens.com>

Jan

> 
>  hw/pcnet.c |   17 ++---------------
>  1 files changed, 2 insertions(+), 15 deletions(-)
> 
> diff --git a/hw/pcnet.c b/hw/pcnet.c
> index 5e63eb5..b52935a 100644
> --- a/hw/pcnet.c
> +++ b/hw/pcnet.c
> @@ -1981,26 +1981,14 @@ static int pci_pcnet_init(PCIDevice *pci_dev)
>  
>      pci_config_set_vendor_id(pci_conf, PCI_VENDOR_ID_AMD);
>      pci_config_set_device_id(pci_conf, PCI_DEVICE_ID_AMD_LANCE);
> -    /* TODO: value should be 0 at RST# */
> -    pci_set_word(pci_conf + PCI_COMMAND,
> -                 PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER);
>      pci_set_word(pci_conf + PCI_STATUS,
>                   PCI_STATUS_FAST_BACK | PCI_STATUS_DEVSEL_MEDIUM);
>      pci_conf[PCI_REVISION_ID] = 0x10;
> -    /* TODO: 0 is the default anyway, no need to set it. */
> -    pci_conf[PCI_CLASS_PROG] = 0x00;
>      pci_config_set_class(pci_conf, PCI_CLASS_NETWORK_ETHERNET);
> -    pci_conf[PCI_HEADER_TYPE] = PCI_HEADER_TYPE_NORMAL; // header_type
> -
> -    /* TODO: not necessary, is set when BAR is registered. */
> -    pci_set_long(pci_conf + PCI_BASE_ADDRESS_0, PCI_BASE_ADDRESS_SPACE_IO);
> -    pci_set_long(pci_conf + PCI_BASE_ADDRESS_0 + 4,
> -                 PCI_BASE_ADDRESS_SPACE_MEMORY);
>  
>      pci_set_word(pci_conf + PCI_SUBSYSTEM_VENDOR_ID, 0x0);
>      pci_set_word(pci_conf + PCI_SUBSYSTEM_ID, 0x0);
>  
> -    /* TODO: value must be 0 at RST# */
>      pci_conf[PCI_INTERRUPT_PIN] = 1; // interrupt pin 0
>      pci_conf[PCI_MIN_GNT] = 0x06;
>      pci_conf[PCI_MAX_LAT] = 0xff;
> @@ -2009,11 +1997,10 @@ static int pci_pcnet_init(PCIDevice *pci_dev)
>      s->mmio_index =
>        cpu_register_io_memory(pcnet_mmio_read, pcnet_mmio_write, &d->state);
>  
> -    /* TODO: use pci_dev, avoid cast below. */
> -    pci_register_bar((PCIDevice *)d, 0, PCNET_IOPORT_SIZE,
> +    pci_register_bar(pci_dev, 0, PCNET_IOPORT_SIZE,
>                             PCI_BASE_ADDRESS_SPACE_IO, pcnet_ioport_map);
>  
> -    pci_register_bar((PCIDevice *)d, 1, PCNET_PNPMMIO_SIZE,
> +    pci_register_bar(pci_dev, 1, PCNET_PNPMMIO_SIZE,
>                             PCI_BASE_ADDRESS_SPACE_MEMORY, pcnet_mmio_map);
>  
>      s->irq = pci_dev->irq[0];