Re: [Xen-devel] [PATCH 10/10] xen/arm: vpl011: Add a pl011 uart DT node in the guest device tree

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

On Mon, 3 Apr 2017, Bhupinder Thakur wrote:
> The SBSA uart node format is as specified in
> Documentation/devicetree/bindings/serial/arm_sbsa_uart.txt and given below:
> 
> ARM SBSA defined generic UART
> ------------------------------
> This UART uses a subset of the PL011 registers and consequently lives
> in the PL011 driver. It's baudrate and other communication parameters
> cannot be adjusted at runtime, so it lacks a clock specifier here.
> 
> Required properties:
> - compatible: must be "arm,sbsa-uart"
> - reg: exactly one register range
> - interrupts: exactly one interrupt specifier
> - current-speed: the (fixed) baud rate set by the firmware
> 
> Signed-off-by: Bhupinder Thakur <bhupinder.thakur@xxxxxxxxxx>
> ---
>  tools/libxl/libxl_arm.c | 48 ++++++++++++++++++++++++++++++++++++++++++++++--
>  1 file changed, 46 insertions(+), 2 deletions(-)
> 
> diff --git a/tools/libxl/libxl_arm.c b/tools/libxl/libxl_arm.c
> index d842d88..b25fff6 100644
> --- a/tools/libxl/libxl_arm.c
> +++ b/tools/libxl/libxl_arm.c
> @@ -57,6 +57,13 @@ int libxl__arch_domain_prepare_config(libxl__gc *gc,
>              nr_spis = spi + 1;
>      }
>  
> +    /*
> +     * If pl011 is enabled then increment the nr_spis to allow allocation
> +     * of a SPI VIRQ for pl011.
> +     */
> +    if (libxl_defbool_val(d_config->b_info.enable_pl011))
> +        nr_spis += 1;
> +
>      LOG(DEBUG, "Configure the domain");
>  
>      xc_config->nr_spis = nr_spis;
> @@ -130,9 +137,10 @@ static struct arch_info {
>      const char *guest_type;
>      const char *timer_compat;
>      const char *cpu_compat;
> +    const char *uart_compat;
>  } arch_info[] = {
> -    {"xen-3.0-armv7l",  "arm,armv7-timer", "arm,cortex-a15" },
> -    {"xen-3.0-aarch64", "arm,armv8-timer", "arm,armv8" },
> +    {"xen-3.0-armv7l",  "arm,armv7-timer", "arm,cortex-a15", "arm,sbsa-uart" 
> },
> +    {"xen-3.0-aarch64", "arm,armv8-timer", "arm,armv8", "arm,sbsa-uart" },
>  };
>  
>  /*
> @@ -590,6 +598,39 @@ static int make_hypervisor_node(libxl__gc *gc, void *fdt,
>      return 0;
>  }
>  
> +static int make_vpl011_uart_node(libxl__gc *gc, void *fdt,
> +                                 const struct arch_info *ainfo,
> +                                 struct xc_dom_image *dom)
> +{
> +    int res;
> +    gic_interrupt intr;
> +
> +    res = fdt_begin_node(fdt, "sbsa-pl011");
> +    if (res) return res;
> +
> +    res = fdt_property_compat(gc, fdt, 1, ainfo->uart_compat);
> +    if (res) return res;
> +
> +    res = fdt_property_regs(gc, fdt, ROOT_ADDRESS_CELLS, ROOT_SIZE_CELLS,
> +                            1,
> +                            GUEST_PL011_BASE, GUEST_PL011_SIZE);

strange indentation


> +    if (res)
> +        return res;

you might as well keep doing if (res) return res; everywhere.

Aside from these two minor issues:

Reviewed-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>


> +    set_interrupt(intr, GUEST_VPL011_SPI, 0xf, DT_IRQ_TYPE_LEVEL_HIGH);
> +
> +    res = fdt_property_interrupts(gc, fdt, &intr, 1);
> +    if (res) return res;
> +
> +    /* Use a default baud rate of 115200. */
> +    fdt_property_u32(fdt, "current-speed", 115200);
> +
> +    res = fdt_end_node(fdt);
> +    if (res) return res;
> +
> +    return 0;
> +}
> +
>  static const struct arch_info *get_arch_info(libxl__gc *gc,
>                                               const struct xc_dom_image *dom)
>  {
> @@ -889,6 +930,9 @@ next_resize:
>          FDT( make_timer_node(gc, fdt, ainfo, xc_config->clock_frequency) );
>          FDT( make_hypervisor_node(gc, fdt, vers) );
>  
> +        if ( libxl_defbool_val(info->enable_pl011) )
> +                FDT( make_vpl011_uart_node(gc, fdt, ainfo, dom) );
> +
>          if (pfdt)
>              FDT( copy_partial_fdt(gc, fdt, pfdt) );
>  
> -- 
> 2.7.4
> 

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