[PATCH v2] hw/adc/stm32f2xx_adc: Correct memory region size and access size

[PATCH v2] hw/adc/stm32f2xx_adc: Correct memory region size and access size

[Philippe Mathieu-Daudé]

The ADC region size is 256B, split as:
 - [0x00 - 0x4f] defined
 - [0x50 - 0xff] reserved

All registers are 32-bit (thus when the datasheet mentions the
last defined register is 0x4c, it means its address range is
0x4c .. 0x4f.

This model implementation is also 32-bit. Set MemoryRegionOps
'impl' fields.

See:
  'RM0033 Reference manual Rev 8', Table 10.13.18 "ADC register map".

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
---
v2: Commit staged changes... (MemoryRegionOps::impl)
---
 hw/adc/stm32f2xx_adc.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/hw/adc/stm32f2xx_adc.c b/hw/adc/stm32f2xx_adc.c
index 4f9d485ecf..01a0b14e69 100644
--- a/hw/adc/stm32f2xx_adc.c
+++ b/hw/adc/stm32f2xx_adc.c
@@ -246,6 +246,8 @@ static const MemoryRegionOps stm32f2xx_adc_ops = {
     .read = stm32f2xx_adc_read,
     .write = stm32f2xx_adc_write,
     .endianness = DEVICE_NATIVE_ENDIAN,
+    .impl.min_access_size = 4,
+    .impl.max_access_size = 4,
 };
 
 static const VMStateDescription vmstate_stm32f2xx_adc = {
@@ -278,7 +280,7 @@ static void stm32f2xx_adc_init(Object *obj)
     sysbus_init_irq(SYS_BUS_DEVICE(obj), &s->irq);
 
     memory_region_init_io(&s->mmio, obj, &stm32f2xx_adc_ops, s,
-                          TYPE_STM32F2XX_ADC, 0xFF);
+                          TYPE_STM32F2XX_ADC, 0x100);
     sysbus_init_mmio(SYS_BUS_DEVICE(obj), &s->mmio);
 }
 
-- 
2.21.3

Re: [PATCH v2] hw/adc/stm32f2xx_adc: Correct memory region size and access size

[Alistair Francis]

On Mon, May 25, 2020 at 4:10 AM Philippe Mathieu-Daudé <f4bug@amsat.org> wrote:
>
> The ADC region size is 256B, split as:
>  - [0x00 - 0x4f] defined
>  - [0x50 - 0xff] reserved
>
> All registers are 32-bit (thus when the datasheet mentions the
> last defined register is 0x4c, it means its address range is
> 0x4c .. 0x4f.
>
> This model implementation is also 32-bit. Set MemoryRegionOps
> 'impl' fields.
>
> See:
>   'RM0033 Reference manual Rev 8', Table 10.13.18 "ADC register map".
>
> Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>

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

Alistair

> ---
> v2: Commit staged changes... (MemoryRegionOps::impl)
> ---
>  hw/adc/stm32f2xx_adc.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/hw/adc/stm32f2xx_adc.c b/hw/adc/stm32f2xx_adc.c
> index 4f9d485ecf..01a0b14e69 100644
> --- a/hw/adc/stm32f2xx_adc.c
> +++ b/hw/adc/stm32f2xx_adc.c
> @@ -246,6 +246,8 @@ static const MemoryRegionOps stm32f2xx_adc_ops = {
>      .read = stm32f2xx_adc_read,
>      .write = stm32f2xx_adc_write,
>      .endianness = DEVICE_NATIVE_ENDIAN,
> +    .impl.min_access_size = 4,
> +    .impl.max_access_size = 4,
>  };
>
>  static const VMStateDescription vmstate_stm32f2xx_adc = {
> @@ -278,7 +280,7 @@ static void stm32f2xx_adc_init(Object *obj)
>      sysbus_init_irq(SYS_BUS_DEVICE(obj), &s->irq);
>
>      memory_region_init_io(&s->mmio, obj, &stm32f2xx_adc_ops, s,
> -                          TYPE_STM32F2XX_ADC, 0xFF);
> +                          TYPE_STM32F2XX_ADC, 0x100);
>      sysbus_init_mmio(SYS_BUS_DEVICE(obj), &s->mmio);
>  }
>
> --
> 2.21.3
>
>