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[PATCH v2 05/12] hw/ssi: Introduce a ssi_get_cs() helper

Cédric Le Goater posted 12 patches 2 years, 8 months ago
Maintainers: "Cédric Le Goater" <clg@kaod.org>, Peter Maydell <peter.maydell@linaro.org>, Andrew Jeffery <andrew@aj.id.au>, Joel Stanley <joel@jms.id.au>, "Edgar E. Iglesias" <edgar.iglesias@gmail.com>, Alistair Francis <alistair@alistair23.me>, Kevin Wolf <kwolf@redhat.com>, Hanna Reitz <hreitz@redhat.com>, "Philippe Mathieu-Daudé" <philmd@linaro.org>
[PATCH v2 05/12] hw/ssi: Introduce a ssi_get_cs() helper
Posted by Cédric Le Goater 2 years, 8 months ago 
Simple routine to retrieve a DeviceState object on a SPI bus using its
address/cs. It will be useful for the board to wire the CS lines.

Cc: Alistair Francis <alistair@alistair23.me>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
---
 include/hw/ssi/ssi.h |  2 ++
 hw/ssi/ssi.c         | 15 +++++++++++++++
 2 files changed, 17 insertions(+)

diff --git a/include/hw/ssi/ssi.h b/include/hw/ssi/ssi.h
index 9e0706a5248c..01662521b09a 100644
--- a/include/hw/ssi/ssi.h
+++ b/include/hw/ssi/ssi.h
@@ -112,4 +112,6 @@ SSIBus *ssi_create_bus(DeviceState *parent, const char *name);
 
 uint32_t ssi_transfer(SSIBus *bus, uint32_t val);
 
+DeviceState *ssi_get_cs(SSIBus *bus, uint8_t addr);
+
 #endif
diff --git a/hw/ssi/ssi.c b/hw/ssi/ssi.c
index d4409535429c..7c71fce0db90 100644
--- a/hw/ssi/ssi.c
+++ b/hw/ssi/ssi.c
@@ -27,6 +27,21 @@ struct SSIBus {
 #define TYPE_SSI_BUS "SSI"
 OBJECT_DECLARE_SIMPLE_TYPE(SSIBus, SSI_BUS)
 
+DeviceState *ssi_get_cs(SSIBus *bus, uint8_t addr)
+{
+    BusState *b = BUS(bus);
+    BusChild *kid;
+
+    QTAILQ_FOREACH(kid, &b->children, sibling) {
+        SSIPeripheral *kid_ssi = SSI_PERIPHERAL(kid->child);
+        if (kid_ssi->addr == addr) {
+            return kid->child;
+        }
+    }
+
+    return NULL;
+}
+
 static const TypeInfo ssi_bus_info = {
     .name = TYPE_SSI_BUS,
     .parent = TYPE_BUS,
-- 
2.40.1
Re: [PATCH v2 05/12] hw/ssi: Introduce a ssi_get_cs() helper
Posted by Philippe Mathieu-Daudé 2 years, 7 months ago 
On 7/6/23 06:39, Cédric Le Goater wrote:
> Simple routine to retrieve a DeviceState object on a SPI bus using its
> address/cs. It will be useful for the board to wire the CS lines.
> 
> Cc: Alistair Francis <alistair@alistair23.me>
> Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
> Signed-off-by: Cédric Le Goater <clg@kaod.org>
> ---
>   include/hw/ssi/ssi.h |  2 ++
>   hw/ssi/ssi.c         | 15 +++++++++++++++
>   2 files changed, 17 insertions(+)
> 
> diff --git a/include/hw/ssi/ssi.h b/include/hw/ssi/ssi.h
> index 9e0706a5248c..01662521b09a 100644
> --- a/include/hw/ssi/ssi.h
> +++ b/include/hw/ssi/ssi.h
> @@ -112,4 +112,6 @@ SSIBus *ssi_create_bus(DeviceState *parent, const char *name);
>   
>   uint32_t ssi_transfer(SSIBus *bus, uint32_t val);
>   
> +DeviceState *ssi_get_cs(SSIBus *bus, uint8_t addr);

Revisiting this patch, I now think this should be:

   qemu_irq ssi_get_cs(SSIBus *bus, uint8_t chipselect);


>   #endif
> diff --git a/hw/ssi/ssi.c b/hw/ssi/ssi.c
> index d4409535429c..7c71fce0db90 100644
> --- a/hw/ssi/ssi.c
> +++ b/hw/ssi/ssi.c
> @@ -27,6 +27,21 @@ struct SSIBus {
>   #define TYPE_SSI_BUS "SSI"
>   OBJECT_DECLARE_SIMPLE_TYPE(SSIBus, SSI_BUS)
>   
> +DeviceState *ssi_get_cs(SSIBus *bus, uint8_t addr)
> +{
> +    BusState *b = BUS(bus);
> +    BusChild *kid;
> +
> +    QTAILQ_FOREACH(kid, &b->children, sibling) {
> +        SSIPeripheral *kid_ssi = SSI_PERIPHERAL(kid->child);
> +        if (kid_ssi->addr == addr) {
> +            return kid->child;

and:

                return qdev_get_gpio_in_named(kid->child,
                                              SSI_GPIO_CS, 0);

> +        }
> +    }
> +
> +    return NULL;
> +}
> +
>   static const TypeInfo ssi_bus_info = {
>       .name = TYPE_SSI_BUS,
>       .parent = TYPE_BUS,
Re: [PATCH v2 05/12] hw/ssi: Introduce a ssi_get_cs() helper
Posted by Cédric Le Goater 2 years, 7 months ago 
On 6/29/23 13:09, Philippe Mathieu-Daudé wrote:
> On 7/6/23 06:39, Cédric Le Goater wrote:
>> Simple routine to retrieve a DeviceState object on a SPI bus using its
>> address/cs. It will be useful for the board to wire the CS lines.
>>
>> Cc: Alistair Francis <alistair@alistair23.me>
>> Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
>> Signed-off-by: Cédric Le Goater <clg@kaod.org>
>> ---
>>   include/hw/ssi/ssi.h |  2 ++
>>   hw/ssi/ssi.c         | 15 +++++++++++++++
>>   2 files changed, 17 insertions(+)
>>
>> diff --git a/include/hw/ssi/ssi.h b/include/hw/ssi/ssi.h
>> index 9e0706a5248c..01662521b09a 100644
>> --- a/include/hw/ssi/ssi.h
>> +++ b/include/hw/ssi/ssi.h
>> @@ -112,4 +112,6 @@ SSIBus *ssi_create_bus(DeviceState *parent, const char *name);
>>   uint32_t ssi_transfer(SSIBus *bus, uint32_t val);
>> +DeviceState *ssi_get_cs(SSIBus *bus, uint8_t addr);
> 
> Revisiting this patch, I now think this should be:
> 
>    qemu_irq ssi_get_cs(SSIBus *bus, uint8_t chipselect);

The device is needed for some other use. See :

   [PATCH v2 10/12] aspeed: Get the BlockBackend of FMC0 from the flash device

C.

> 
> 
>>   #endif
>> diff --git a/hw/ssi/ssi.c b/hw/ssi/ssi.c
>> index d4409535429c..7c71fce0db90 100644
>> --- a/hw/ssi/ssi.c
>> +++ b/hw/ssi/ssi.c
>> @@ -27,6 +27,21 @@ struct SSIBus {
>>   #define TYPE_SSI_BUS "SSI"
>>   OBJECT_DECLARE_SIMPLE_TYPE(SSIBus, SSI_BUS)
>> +DeviceState *ssi_get_cs(SSIBus *bus, uint8_t addr)
>> +{
>> +    BusState *b = BUS(bus);
>> +    BusChild *kid;
>> +
>> +    QTAILQ_FOREACH(kid, &b->children, sibling) {
>> +        SSIPeripheral *kid_ssi = SSI_PERIPHERAL(kid->child);
>> +        if (kid_ssi->addr == addr) {
>> +            return kid->child;
> 
> and:
> 
>                 return qdev_get_gpio_in_named(kid->child,
>                                               SSI_GPIO_CS, 0);
> 
>> +        }
>> +    }
>> +
>> +    return NULL;
>> +}
>> +
>>   static const TypeInfo ssi_bus_info = {
>>       .name = TYPE_SSI_BUS,
>>       .parent = TYPE_BUS,
>
Re: [PATCH v2 05/12] hw/ssi: Introduce a ssi_get_cs() helper
Posted by Joel Stanley 2 years, 8 months ago 
On Wed, 7 Jun 2023 at 04:40, Cédric Le Goater <clg@kaod.org> wrote:
>
> Simple routine to retrieve a DeviceState object on a SPI bus using its
> address/cs. It will be useful for the board to wire the CS lines.
>
> Cc: Alistair Francis <alistair@alistair23.me>
> Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
> Signed-off-by: Cédric Le Goater <clg@kaod.org>

Reviewed-by: Joel Stanley <joel@jms.id.au>

> ---
>  include/hw/ssi/ssi.h |  2 ++
>  hw/ssi/ssi.c         | 15 +++++++++++++++
>  2 files changed, 17 insertions(+)
>
> diff --git a/include/hw/ssi/ssi.h b/include/hw/ssi/ssi.h
> index 9e0706a5248c..01662521b09a 100644
> --- a/include/hw/ssi/ssi.h
> +++ b/include/hw/ssi/ssi.h
> @@ -112,4 +112,6 @@ SSIBus *ssi_create_bus(DeviceState *parent, const char *name);
>
>  uint32_t ssi_transfer(SSIBus *bus, uint32_t val);
>
> +DeviceState *ssi_get_cs(SSIBus *bus, uint8_t addr);
> +
>  #endif
> diff --git a/hw/ssi/ssi.c b/hw/ssi/ssi.c
> index d4409535429c..7c71fce0db90 100644
> --- a/hw/ssi/ssi.c
> +++ b/hw/ssi/ssi.c
> @@ -27,6 +27,21 @@ struct SSIBus {
>  #define TYPE_SSI_BUS "SSI"
>  OBJECT_DECLARE_SIMPLE_TYPE(SSIBus, SSI_BUS)
>
> +DeviceState *ssi_get_cs(SSIBus *bus, uint8_t addr)
> +{
> +    BusState *b = BUS(bus);
> +    BusChild *kid;
> +
> +    QTAILQ_FOREACH(kid, &b->children, sibling) {
> +        SSIPeripheral *kid_ssi = SSI_PERIPHERAL(kid->child);
> +        if (kid_ssi->addr == addr) {
> +            return kid->child;
> +        }
> +    }
> +
> +    return NULL;
> +}
> +
>  static const TypeInfo ssi_bus_info = {
>      .name = TYPE_SSI_BUS,
>      .parent = TYPE_BUS,
> --
> 2.40.1
>

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