Re: [Xen-devel] [PATCH v5 18/22] arm/acpi: Add a new ACPI initialized function for UART

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Fri, 26 Feb 2016, Shannon Zhao wrote:
> From: Shannon Zhao <shannon.zhao@xxxxxxxxxx>
> 
> This adds a new function to initialize UART for ACPI on ARM.
> 
> Signed-off-by: Shannon Zhao <shannon.zhao@xxxxxxxxxx>

Reviewed-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>


> V5: fix coding style
> ---
>  xen/arch/arm/setup.c        |  2 +-
>  xen/drivers/char/arm-uart.c | 37 +++++++++++++++++++++++++++++++++++--
>  xen/include/xen/serial.h    |  2 +-
>  3 files changed, 37 insertions(+), 4 deletions(-)
> 
> diff --git a/xen/arch/arm/setup.c b/xen/arch/arm/setup.c
> index d4261e8..6d205a9 100644
> --- a/xen/arch/arm/setup.c
> +++ b/xen/arch/arm/setup.c
> @@ -768,7 +768,7 @@ void __init start_xen(unsigned long boot_phys_offset,
>  
>      gic_preinit();
>  
> -    dt_uart_init();
> +    arm_uart_init();
>      console_init_preirq();
>      console_init_ring();
>  
> diff --git a/xen/drivers/char/arm-uart.c b/xen/drivers/char/arm-uart.c
> index 883e615..627746b 100644
> --- a/xen/drivers/char/arm-uart.c
> +++ b/xen/drivers/char/arm-uart.c
> @@ -1,7 +1,7 @@
>  /*
>   * xen/drivers/char/arm-uart.c
>   *
> - * Generic uart retrieved via the device tree
> + * Generic uart retrieved via the device tree or ACPI
>   *
>   * Julien Grall <julien.grall@xxxxxxxxxx>
>   * Copyright (c) 2013 Linaro Limited.
> @@ -23,6 +23,7 @@
>  #include <xen/device_tree.h>
>  #include <xen/serial.h>
>  #include <xen/errno.h>
> +#include <xen/acpi.h>
>  
>  /*
>   * Configure UART port with a string:
> @@ -35,7 +36,7 @@
>  static char __initdata opt_dtuart[256] = "";
>  string_param("dtuart", opt_dtuart);
>  
> -void __init dt_uart_init(void)
> +static void __init dt_uart_init(void)
>  {
>      struct dt_device_node *dev;
>      int ret;
> @@ -96,6 +97,38 @@ void __init dt_uart_init(void)
>          printk("Unable to initialize dtuart: %d\n", ret);
>  }
>  
> +#ifdef CONFIG_ACPI
> +static void __init acpi_uart_init(void)
> +{
> +    struct acpi_table_spcr *spcr = NULL;
> +    int ret;
> +
> +    acpi_get_table(ACPI_SIG_SPCR, 0, (struct acpi_table_header **)&spcr);
> +
> +    if ( spcr == NULL )
> +    {
> +        printk("Unable to get spcr table\n");
> +    }
> +    else
> +    {
> +        ret = acpi_device_init(DEVICE_SERIAL, NULL, spcr->interface_type);
> +
> +        if ( ret )
> +            printk("Unable to initialize acpi uart: %d\n", ret);
> +    }
> +}
> +#else
> +static void __init acpi_uart_init(void) { }
> +#endif
> +
> +void __init arm_uart_init(void)
> +{
> +    if ( acpi_disabled )
> +        dt_uart_init();
> +    else
> +        acpi_uart_init();
> +}
> +
>  /*
>   * Local variables:
>   * mode: C
> diff --git a/xen/include/xen/serial.h b/xen/include/xen/serial.h
> index 71e6ade..1212a12 100644
> --- a/xen/include/xen/serial.h
> +++ b/xen/include/xen/serial.h
> @@ -170,7 +170,7 @@ struct ns16550_defaults {
>  void ns16550_init(int index, struct ns16550_defaults *defaults);
>  void ehci_dbgp_init(void);
>  
> -void __init dt_uart_init(void);
> +void arm_uart_init(void);
>  
>  struct physdev_dbgp_op;
>  int dbgp_op(const struct physdev_dbgp_op *);
> -- 
> 2.0.4
> 
> 

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