Re: [Qemu-devel] [PATCH 12/17] e500: add i2c controller to CCSR

[Michael Davidsaver <mdavidsaver@gmail.com>]

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On 12/05/2017 01:49 AM, David Gibson wrote:
> On Sun, Nov 26, 2017 at 03:59:10PM -0600, Michael Davidsaver wrote:
>> Add i2c controller found on mpc8540,
>> mpc8544, and P2010 (newer ppc, unmodeled).
> 
> This adds it unconditionally.  Are there any E500 models where it
> doesn't exist?

Not in the devices I've looked at, though I certainly haven't looked
at them all.  In fact the mpc8544 has two i2c controllers.

I keep mentioning the P2010 as it is about a decade
newer than the mpc85xx chips.  My _assumption_ is that the commonalities
between these are a reasonable least common denominator.


>>
>> Signed-off-by: Michael Davidsaver <mdavidsaver@gmail.com>
>> ---
>>  hw/ppc/e500_ccsr.c | 15 +++++++++++++++
>>  1 file changed, 15 insertions(+)
>>
>> diff --git a/hw/ppc/e500_ccsr.c b/hw/ppc/e500_ccsr.c
>> index c479ed91ee..cd8216daaf 100644
>> --- a/hw/ppc/e500_ccsr.c
>> +++ b/hw/ppc/e500_ccsr.c
>> @@ -46,6 +46,8 @@
>>  #define E500_ERR_DETECT  (0x2e40)
>>  #define E500_ERR_DISABLE (0x2e44)
>>  
>> +#define E500_I2C_OFFSET  (0x3000)
>> +
>>  #define E500_DUART_OFFSET(N) (0x4500 + (N) * 0x100)
>>  
>>  #define E500_PORPLLSR    (0xE0000)
>> @@ -72,6 +74,7 @@ typedef struct {
>>      uint32_t ccb_freq;
>>  
>>      DeviceState *pic;
>> +    DeviceState *i2c;
>>  } CCSRState;
>>  
>>  #define TYPE_E500_CCSR "e500-ccsr"
>> @@ -272,6 +275,18 @@ static void e500_ccsr_realize(DeviceState *dev, Error **errp)
>>                                  sysbus_mmio_get_region(pic, 0));
>>      /* Note: MPIC internal interrupts are offset by 16 */
>>  
>> +    /* attach I2C controller */
>> +    ccsr->i2c = qdev_create(NULL, "mpc8540-i2c");
> 
> Ah.. so I think I missed this on many earlier patches.  I believe
> you're not generally supposed to create new subdevices at realize()
> time.  Instead the device should be created at CCSR instance_init()
> time (but the sub device's "realized" property will need to be set to
> 1 from CCSR realize()).
> 
>> +    object_property_add_child(qdev_get_machine(), "i2c[*]",
>> +                              OBJECT(ccsr->i2c), NULL);
>> +    qdev_init_nofail(ccsr->i2c);
>> +    memory_region_add_subregion(&ccsr->iomem, E500_I2C_OFFSET,
>> +                                sysbus_mmio_get_region(
>> +                                    SYS_BUS_DEVICE(ccsr->i2c), 0));
>> +    sysbus_connect_irq(SYS_BUS_DEVICE(ccsr->i2c), 0,
>> +                          qdev_get_gpio_in(ccsr->pic, 16 + 27));
>> +
>> +
>>      /* DUARTS */
>>      /* for mpc8540, mpc8544, and P2010 (unmodeled), the DUART reference clock
>>       * is the CCB clock divided by 16.
> 



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