Re: [PATCH v4 2/3] hw/arm: Connect STM32L4x5 SYSCFG to STM32L4x5 SoC

[Alistair Francis <alistair23@gmail.com>]

On Wed, Jan 10, 2024 at 5:47 AM Inès Varhol
<ines.varhol@telecom-paris.fr> wrote:
>
> The SYSCFG input GPIOs aren't connected yet. When the STM32L4x5 GPIO
> device will be implemented, its output GPIOs will be connected to the
> SYSCFG input GPIOs.
>
> Tested-by: Philippe Mathieu-Daudé <philmd@linaro.org>
> Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
> Signed-off-by: Arnaud Minier <arnaud.minier@telecom-paris.fr>
> Signed-off-by: Inès Varhol <ines.varhol@telecom-paris.fr>

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

Alistair

> ---
>  hw/arm/Kconfig                 |  1 +
>  hw/arm/stm32l4x5_soc.c         | 21 ++++++++++++++++++++-
>  include/hw/arm/stm32l4x5_soc.h |  2 ++
>  3 files changed, 23 insertions(+), 1 deletion(-)
>
> diff --git a/hw/arm/Kconfig b/hw/arm/Kconfig
> index 8c8488a70a..bb4693bfbb 100644
> --- a/hw/arm/Kconfig
> +++ b/hw/arm/Kconfig
> @@ -459,6 +459,7 @@ config STM32L4X5_SOC
>      bool
>      select ARM_V7M
>      select OR_IRQ
> +    select STM32L4X5_SYSCFG
>      select STM32L4X5_EXTI
>
>  config XLNX_ZYNQMP_ARM
> diff --git a/hw/arm/stm32l4x5_soc.c b/hw/arm/stm32l4x5_soc.c
> index fe46b7c6c0..431f982caf 100644
> --- a/hw/arm/stm32l4x5_soc.c
> +++ b/hw/arm/stm32l4x5_soc.c
> @@ -37,6 +37,7 @@
>  #define SRAM2_SIZE (32 * KiB)
>
>  #define EXTI_ADDR 0x40010400
> +#define SYSCFG_ADDR 0x40010000
>
>  #define NUM_EXTI_IRQ 40
>  /* Match exti line connections with their CPU IRQ number */
> @@ -80,6 +81,7 @@ static void stm32l4x5_soc_initfn(Object *obj)
>      Stm32l4x5SocState *s = STM32L4X5_SOC(obj);
>
>      object_initialize_child(obj, "exti", &s->exti, TYPE_STM32L4X5_EXTI);
> +    object_initialize_child(obj, "syscfg", &s->syscfg, TYPE_STM32L4X5_SYSCFG);
>
>      s->sysclk = qdev_init_clock_in(DEVICE(s), "sysclk", NULL, NULL, 0);
>      s->refclk = qdev_init_clock_in(DEVICE(s), "refclk", NULL, NULL, 0);
> @@ -154,6 +156,19 @@ static void stm32l4x5_soc_realize(DeviceState *dev_soc, Error **errp)
>          return;
>      }
>
> +    /* System configuration controller */
> +    busdev = SYS_BUS_DEVICE(&s->syscfg);
> +    if (!sysbus_realize(busdev, errp)) {
> +        return;
> +    }
> +    sysbus_mmio_map(busdev, 0, SYSCFG_ADDR);
> +    /*
> +     * TODO: when the GPIO device is implemented, connect it
> +     * to SYCFG using `qdev_connect_gpio_out`, NUM_GPIOS and
> +     * GPIO_NUM_PINS.
> +     */
> +
> +    /* EXTI device */
>      busdev = SYS_BUS_DEVICE(&s->exti);
>      if (!sysbus_realize(busdev, errp)) {
>          return;
> @@ -163,6 +178,11 @@ static void stm32l4x5_soc_realize(DeviceState *dev_soc, Error **errp)
>          sysbus_connect_irq(busdev, i, qdev_get_gpio_in(armv7m, exti_irq[i]));
>      }
>
> +    for (unsigned i = 0; i < 16; i++) {
> +        qdev_connect_gpio_out(DEVICE(&s->syscfg), i,
> +                              qdev_get_gpio_in(DEVICE(&s->exti), i));
> +    }
> +
>      /* APB1 BUS */
>      create_unimplemented_device("TIM2",      0x40000000, 0x400);
>      create_unimplemented_device("TIM3",      0x40000400, 0x400);
> @@ -200,7 +220,6 @@ static void stm32l4x5_soc_realize(DeviceState *dev_soc, Error **errp)
>      /* RESERVED:    0x40009800, 0x6800 */
>
>      /* APB2 BUS */
> -    create_unimplemented_device("SYSCFG",    0x40010000, 0x30);
>      create_unimplemented_device("VREFBUF",   0x40010030, 0x1D0);
>      create_unimplemented_device("COMP",      0x40010200, 0x200);
>      /* RESERVED:    0x40010800, 0x1400 */
> diff --git a/include/hw/arm/stm32l4x5_soc.h b/include/hw/arm/stm32l4x5_soc.h
> index f7305568dc..baf70410b5 100644
> --- a/include/hw/arm/stm32l4x5_soc.h
> +++ b/include/hw/arm/stm32l4x5_soc.h
> @@ -26,6 +26,7 @@
>
>  #include "exec/memory.h"
>  #include "hw/arm/armv7m.h"
> +#include "hw/misc/stm32l4x5_syscfg.h"
>  #include "hw/misc/stm32l4x5_exti.h"
>  #include "qom/object.h"
>
> @@ -41,6 +42,7 @@ struct Stm32l4x5SocState {
>      ARMv7MState armv7m;
>
>      Stm32l4x5ExtiState exti;
> +    Stm32l4x5SyscfgState syscfg;
>
>      MemoryRegion sram1;
>      MemoryRegion sram2;
> --
> 2.43.0
>
>