Re: [PATCH] sungem: Add WOL MMIO

[Joel Stanley <joel@jms.id.au>]

On Sun, 25 Jun 2023 at 20:17, Nicholas Piggin <npiggin@gmail.com> wrote:
>
> Apple sungem devices are expected to have WOL MMIO registers.
> Add a region to prevent transaction failures, and implement the
> WOL-disable CSR write because the Linux driver reset writes
> this.
>
> Signed-off-by: Nicholas Piggin <npiggin@gmail.com>

Reviewed-by: Joel Stanley <joel@jms.id.au>

> ---
> This fixes the failed MMIO error in the Linux sungem driver reset
> when it clears the WOL CSR.
>
> Thanks,
> Nick
>
>  hw/net/sungem.c     | 52 +++++++++++++++++++++++++++++++++++++++++++++
>  hw/net/trace-events |  2 ++
>  2 files changed, 54 insertions(+)
>
> diff --git a/hw/net/sungem.c b/hw/net/sungem.c
> index eb01520790..e0e8e5ae41 100644
> --- a/hw/net/sungem.c
> +++ b/hw/net/sungem.c
> @@ -107,6 +107,15 @@ OBJECT_DECLARE_SIMPLE_TYPE(SunGEMState, SUNGEM)
>  #define RXDMA_FTAG        0x0110UL    /* RX FIFO Tag */
>  #define RXDMA_FSZ         0x0120UL    /* RX FIFO Size */
>
> +/* WOL Registers */
> +#define SUNGEM_MMIO_WOL_SIZE   0x14
> +
> +#define WOL_MATCH0        0x0000UL
> +#define WOL_MATCH1        0x0004UL
> +#define WOL_MATCH2        0x0008UL
> +#define WOL_MCOUNT        0x000CUL
> +#define WOL_WAKECSR       0x0010UL
> +
>  /* MAC Registers */
>  #define SUNGEM_MMIO_MAC_SIZE   0x200
>
> @@ -168,6 +177,7 @@ OBJECT_DECLARE_SIMPLE_TYPE(SunGEMState, SUNGEM)
>  #define SUNGEM_MMIO_PCS_SIZE   0x60
>  #define PCS_MIISTAT       0x0004UL    /* PCS MII Status Register */
>  #define PCS_ISTAT         0x0018UL    /* PCS Interrupt Status Reg */
> +
>  #define PCS_SSTATE        0x005CUL    /* Serialink State Register */
>
>  /* Descriptors */
> @@ -200,6 +210,7 @@ struct SunGEMState {
>      MemoryRegion greg;
>      MemoryRegion txdma;
>      MemoryRegion rxdma;
> +    MemoryRegion wol;
>      MemoryRegion mac;
>      MemoryRegion mif;
>      MemoryRegion pcs;
> @@ -1076,6 +1087,43 @@ static const MemoryRegionOps sungem_mmio_rxdma_ops = {
>      },
>  };
>
> +static void sungem_mmio_wol_write(void *opaque, hwaddr addr, uint64_t val,
> +                                    unsigned size)
> +{
> +    trace_sungem_mmio_wol_write(addr, val);
> +
> +    switch (addr) {
> +    case WOL_WAKECSR:
> +        if (val != 0) {
> +            qemu_log_mask(LOG_UNIMP, "sungem: WOL not supported\n");
> +        }
> +        break;
> +    default:
> +        qemu_log_mask(LOG_UNIMP, "sungem: WOL not supported\n");
> +    }
> +}
> +
> +static uint64_t sungem_mmio_wol_read(void *opaque, hwaddr addr, unsigned size)
> +{
> +    uint32_t val = -1;
> +
> +    qemu_log_mask(LOG_UNIMP, "sungem: WOL not supported\n");
> +
> +    trace_sungem_mmio_wol_read(addr, val);
> +
> +    return val;
> +}
> +
> +static const MemoryRegionOps sungem_mmio_wol_ops = {
> +    .read = sungem_mmio_wol_read,
> +    .write = sungem_mmio_wol_write,
> +    .endianness = DEVICE_LITTLE_ENDIAN,
> +    .impl = {
> +        .min_access_size = 4,
> +        .max_access_size = 4,
> +    },
> +};
> +
>  static void sungem_mmio_mac_write(void *opaque, hwaddr addr, uint64_t val,
>                                    unsigned size)
>  {
> @@ -1344,6 +1392,10 @@ static void sungem_realize(PCIDevice *pci_dev, Error **errp)
>                            "sungem.rxdma", SUNGEM_MMIO_RXDMA_SIZE);
>      memory_region_add_subregion(&s->sungem, 0x4000, &s->rxdma);
>
> +    memory_region_init_io(&s->wol, OBJECT(s), &sungem_mmio_wol_ops, s,
> +                          "sungem.wol", SUNGEM_MMIO_WOL_SIZE);
> +    memory_region_add_subregion(&s->sungem, 0x3000, &s->wol);
> +
>      memory_region_init_io(&s->mac, OBJECT(s), &sungem_mmio_mac_ops, s,
>                            "sungem.mac", SUNGEM_MMIO_MAC_SIZE);
>      memory_region_add_subregion(&s->sungem, 0x6000, &s->mac);
> diff --git a/hw/net/trace-events b/hw/net/trace-events
> index e4a98b2c7d..930e5b4293 100644
> --- a/hw/net/trace-events
> +++ b/hw/net/trace-events
> @@ -350,6 +350,8 @@ sungem_mmio_txdma_write(uint64_t addr, uint64_t val) "MMIO txdma write to 0x%"PR
>  sungem_mmio_txdma_read(uint64_t addr, uint64_t val) "MMIO txdma read from 0x%"PRIx64" val=0x%"PRIx64
>  sungem_mmio_rxdma_write(uint64_t addr, uint64_t val) "MMIO rxdma write to 0x%"PRIx64" val=0x%"PRIx64
>  sungem_mmio_rxdma_read(uint64_t addr, uint64_t val) "MMIO rxdma read from 0x%"PRIx64" val=0x%"PRIx64
> +sungem_mmio_wol_write(uint64_t addr, uint64_t val) "MMIO wol write to 0x%"PRIx64" val=0x%"PRIx64
> +sungem_mmio_wol_read(uint64_t addr, uint64_t val) "MMIO wol read from 0x%"PRIx64" val=0x%"PRIx64
>  sungem_mmio_mac_write(uint64_t addr, uint64_t val) "MMIO mac write to 0x%"PRIx64" val=0x%"PRIx64
>  sungem_mmio_mac_read(uint64_t addr, uint64_t val) "MMIO mac read from 0x%"PRIx64" val=0x%"PRIx64
>  sungem_mmio_mif_write(uint64_t addr, uint64_t val) "MMIO mif write to 0x%"PRIx64" val=0x%"PRIx64
> --
> 2.40.1
>
>