[U-Boot] [PATCH] x86: minnowmax: add GPIO mapping support

[gabriel huau]

Hi Bin,

On 02/26/2015 07:30 PM, Bin Meng wrote:
> Hi Gabriel,
>
> On Thu, Feb 26, 2015 at 12:27 AM, Gabriel Huau <contact at huau-gabriel.fr> wrote:
>> Hi Bin,
>>
>>
>> On 02/24/2015 11:52 PM, Bin Meng wrote:
>>> Hi Gabriel,
>>>
>>> On Mon, Feb 16, 2015 at 5:55 AM, Gabriel Huau <contact at huau-gabriel.fr>
>>> wrote:
>>>> Configure the pinctrl as it required to make some IO controllers
>>>> working (USB/UART/I2C/...).
>>>> The idea would be in the next version to modify the pch GPIO driver and
>>>> configure these pins through the device tree.
>>>>
>>>> These modifications are ported from the coreboot project.
>>>>
>>>> Signed-off-by: Gabriel Huau <contact at huau-gabriel.fr>
>>>> ---
>>>>    arch/x86/cpu/baytrail/Makefile                |   1 +
>>>>    arch/x86/cpu/baytrail/gpio.c                  | 206 +++++++++++++++
>>>>    arch/x86/include/asm/arch-baytrail/gpio.h     | 364
>>>> ++++++++++++++++++++++++++
>>>>    arch/x86/include/asm/arch-baytrail/iomap.h    |  73 ++++++
>>>>    arch/x86/include/asm/arch-baytrail/irq.h      | 119 +++++++++
>>>>    arch/x86/include/asm/arch-baytrail/irqroute.h |  67 +++++
>>>>    arch/x86/include/asm/arch-baytrail/pci_devs.h | 144 ++++++++++
>>>>    arch/x86/include/asm/arch-baytrail/pmc.h      | 253 ++++++++++++++++++
>>>>    board/intel/minnowmax/minnowmax.c             | 212 +++++++++++++++
>>>>    include/configs/minnowmax.h                   |  11 +
>>>>    10 files changed, 1450 insertions(+)
>>>>    create mode 100644 arch/x86/cpu/baytrail/gpio.c
>>>>    create mode 100644 arch/x86/include/asm/arch-baytrail/iomap.h
>>>>    create mode 100644 arch/x86/include/asm/arch-baytrail/irq.h
>>>>    create mode 100644 arch/x86/include/asm/arch-baytrail/irqroute.h
>>>>    create mode 100644 arch/x86/include/asm/arch-baytrail/pci_devs.h
>>>>    create mode 100644 arch/x86/include/asm/arch-baytrail/pmc.h
>>>>
>>> [snip]
>>>
>>>> diff --git a/include/configs/minnowmax.h b/include/configs/minnowmax.h
>>>> index 823e051..738c6fa 100644
>>>> --- a/include/configs/minnowmax.h
>>>> +++ b/include/configs/minnowmax.h
>>>> @@ -69,4 +69,15 @@
>>>>    /* Avoid a warning in the Realtek Ethernet driver */
>>>>    #define CONFIG_SYS_CACHELINE_SIZE 16
>>>>
>>>> +/*
>>>> + * Baytrail has 3 GPIOs bank over PCI, there is no
>>>> + * driver at the moment so let's disable the command
>>>> + * and the default x86 driver to avoid any collision
>>>> + * with the GPIO mapping code.
>>>> + * @TODO: adding a baytrail-gpio driver and configure
>>>> + * the muxing through the device tree
>>>> + */
>>>> +#undef CONFIG_INTEL_ICH6_GPIO
>>>> +#undef CONFIG_CMD_GPIO
>>>> +
>>> Why undef these two? The BayTrail SoC does support GPIO banks in the
>>> legacy bridge.
>> I might misunderstood the GPIO subsystem but I thought there was 2 banks
>> available through the PCU iLB GPIO controller which contains the SCORE and
>> SSUS (102 / 44 pins).
>> The intel_ich6_gpio has a limitation of 32 GPIOs per bank and I thought it
>> was just a different controller from the Baytrail, but if I can use it to
>> control all the GPIOs + doing the IO mapping, I'll be glad to do it!
> I checked the BayTrail datasheet. Its GPIO is in the iLB (legacy
> bridge), which is the same as other IA chipset (Ivybridge,
> TunnelCreek, Quark). It has 4 banks in core domain and 2 banks in sus
> domain. So 6 banks in total. You need define 6 gpio nodes in the
> minnowmax board dts file. You should be able to use the existing gpio
> driver to configure.

Thanks for the clarification!
Actually, I saw it today when I was doing some tests and I configured 
the 6 banks in the devices tree. I also fixed the GPIO base address to 
0x48 but I got some issues like the fact I'm reading only 0 from all the 
registers.

The registers are configured to be in the IO Space (0x500), I checked 
the PCI configuration space to make sure that everything is enabled 
correctly, but I'm still missing something.

Once I'll be able to use these GPIOs, I will update the entire patch to 
remove the port from Coreboot as this is not necessary.

>>>>    #endif /* __CONFIG_H */
>>>> --
> Regards,
> Bin

Regards,
Gabriel