Re: [PATCH v2 4/5] hw/char: cadence_uart: Convert to memop_with_attrs() ops

[Alistair Francis]

On Wed, Sep 1, 2021 at 1:30 PM Bin Meng <bmeng.cn@gmail.com> wrote:
>
> This converts uart_read() and uart_write() to memop_with_attrs() ops.
>
> Signed-off-by: Bin Meng <bmeng.cn@gmail.com>

Reviewed-by: Alistair Francis <alistair.francis@wdc.com>

Alistair

>
> ---
>
> Changes in v2:
> - new patch: hw/char: cadence_uart: Convert to memop_with_attrs() ops
>
>  hw/char/cadence_uart.c | 26 +++++++++++++++-----------
>  1 file changed, 15 insertions(+), 11 deletions(-)
>
> diff --git a/hw/char/cadence_uart.c b/hw/char/cadence_uart.c
> index fff8be3619..8bcf2b718a 100644
> --- a/hw/char/cadence_uart.c
> +++ b/hw/char/cadence_uart.c
> @@ -411,15 +411,15 @@ static void uart_read_rx_fifo(CadenceUARTState *s, 
> uint32_t *c)
>      uart_update_status(s);
>  }
>
> -static void uart_write(void *opaque, hwaddr offset,
> -                          uint64_t value, unsigned size)
> +static MemTxResult uart_write(void *opaque, hwaddr offset,
> +                              uint64_t value, unsigned size, MemTxAttrs 
> attrs)
>  {
>      CadenceUARTState *s = opaque;
>
>      DB_PRINT(" offset:%x data:%08x\n", (unsigned)offset, (unsigned)value);
>      offset >>= 2;
>      if (offset >= CADENCE_UART_R_MAX) {
> -        return;
> +        return MEMTX_DECODE_ERROR;
>      }
>      switch (offset) {
>      case R_IER: /* ier (wts imr) */
> @@ -466,30 +466,34 @@ static void uart_write(void *opaque, hwaddr offset,
>          break;
>      }
>      uart_update_status(s);
> +
> +    return MEMTX_OK;
>  }
>
> -static uint64_t uart_read(void *opaque, hwaddr offset,
> -        unsigned size)
> +static MemTxResult uart_read(void *opaque, hwaddr offset,
> +                             uint64_t *value, unsigned size, MemTxAttrs 
> attrs)
>  {
>      CadenceUARTState *s = opaque;
>      uint32_t c = 0;
>
>      offset >>= 2;
>      if (offset >= CADENCE_UART_R_MAX) {
> -        c = 0;
> -    } else if (offset == R_TX_RX) {
> +        return MEMTX_DECODE_ERROR;
> +    }
> +    if (offset == R_TX_RX) {
>          uart_read_rx_fifo(s, &c);
>      } else {
> -       c = s->r[offset];
> +        c = s->r[offset];
>      }
>
>      DB_PRINT(" offset:%x data:%08x\n", (unsigned)(offset << 2), (unsigned)c);
> -    return c;
> +    *value = c;
> +    return MEMTX_OK;
>  }
>
>  static const MemoryRegionOps uart_ops = {
> -    .read = uart_read,
> -    .write = uart_write,
> +    .read_with_attrs = uart_read,
> +    .write_with_attrs = uart_write,
>      .endianness = DEVICE_NATIVE_ENDIAN,
>  };
>
> --
> 2.25.1
>
>