Re: [Qemu-devel] [PATCH 2/2] hw/arm/virt: Provide PL031 RTC

[Aurelien Jarno]

On Tue, Jun 10, 2014 at 03:51:47PM +0100, Peter Maydell wrote:
> UEFI mandates that the platform must include an RTC, so provide
> one in 'virt', using the PL031.
> 
> Signed-off-by: Peter Maydell <address@hidden>
> ---
>  hw/arm/virt.c | 30 ++++++++++++++++++++++++++++++
>  1 file changed, 30 insertions(+)
> 
> diff --git a/hw/arm/virt.c b/hw/arm/virt.c
> index 10f8fcb..54956fe 100644
> --- a/hw/arm/virt.c
> +++ b/hw/arm/virt.c
> @@ -66,6 +66,7 @@ enum {
>      VIRT_GIC_CPU,
>      VIRT_UART,
>      VIRT_MMIO,
> +    VIRT_RTC,
>  };
>  
>  typedef struct MemMapEntry {
> @@ -93,6 +94,8 @@ typedef struct VirtBoardInfo {
>   * high memory region beyond 4GB).
>   * This represents a compromise between how much RAM can be given to
>   * a 32 bit VM and leaving space for expansion and in particular for PCI.
> + * Note that devices should generally be placed at multiples of 0x10000,
> + * to accommodate guests using 64K pages.
>   */
>  static const MemMapEntry a15memmap[] = {
>      [VIRT_FLASH] = { 0, 0x8000000 },
> @@ -101,6 +104,7 @@ static const MemMapEntry a15memmap[] = {
>      [VIRT_GIC_DIST] = { 0x8000000, 0x10000 },
>      [VIRT_GIC_CPU] = { 0x8010000, 0x10000 },
>      [VIRT_UART] = { 0x9000000, 0x1000 },
> +    [VIRT_RTC] = { 0x90010000, 0x1000 },
>      [VIRT_MMIO] = { 0xa000000, 0x200 },
>      /* ...repeating for a total of NUM_VIRTIO_TRANSPORTS, each of that size 
> */
>      /* 0x10000000 .. 0x40000000 reserved for PCI */
> @@ -109,6 +113,7 @@ static const MemMapEntry a15memmap[] = {
>  
>  static const int a15irqmap[] = {
>      [VIRT_UART] = 1,
> +    [VIRT_RTC] = 2,
>      [VIRT_MMIO] = 16, /* ...to 16 + NUM_VIRTIO_TRANSPORTS - 1 */
>  };
>  
> @@ -340,6 +345,29 @@ static void create_uart(const VirtBoardInfo *vbi, 
> qemu_irq *pic)
>      g_free(nodename);
>  }
>  
> +static void create_rtc(const VirtBoardInfo *vbi, qemu_irq *pic)
> +{
> +    char *nodename;
> +    hwaddr base = vbi->memmap[VIRT_RTC].base;
> +    hwaddr size = vbi->memmap[VIRT_RTC].size;
> +    int irq = vbi->irqmap[VIRT_RTC];
> +    const char compat[] = "arm,pl031\0arm,primecell";
> +
> +    sysbus_create_simple("pl031", base, pic[irq]);
> +
> +    nodename = g_strdup_printf("/address@hidden" PRIx64, base);
> +    qemu_fdt_add_subnode(vbi->fdt, nodename);
> +    qemu_fdt_setprop(vbi->fdt, nodename, "compatible", compat, 
> sizeof(compat));
> +    qemu_fdt_setprop_sized_cells(vbi->fdt, nodename, "reg",
> +                                 2, base, 2, size);
> +    qemu_fdt_setprop_cells(vbi->fdt, nodename, "interrupts",
> +                           GIC_FDT_IRQ_TYPE_SPI, irq,
> +                           GIC_FDT_IRQ_FLAGS_EDGE_LO_HI);
> +    qemu_fdt_setprop_cell(vbi->fdt, nodename, "clocks", vbi->clock_phandle);
> +    qemu_fdt_setprop_string(vbi->fdt, nodename, "clock-names", "apb_pclk");
> +    g_free(nodename);
> +}
> +
>  static void create_virtio_devices(const VirtBoardInfo *vbi, qemu_irq *pic)
>  {
>      int i;
> @@ -516,6 +544,8 @@ static void machvirt_init(MachineState *machine)
>  
>      create_uart(vbi, pic);
>  
> +    create_rtc(vbi, pic);
> +
>      /* Create mmio transports, so the user can create virtio backends
>       * (which will be automatically plugged in to the transports). If
>       * no backend is created the transport will just sit harmlessly idle.

Tested-by: Aurelien Jarno <address@hidden>
Reviewed-by: Aurelien Jarno <address@hidden>


-- 
Aurelien Jarno                          GPG: 4096R/1DDD8C9B
address@hidden                 http://www.aurel32.net