From mboxrd@z Thu Jan  1 00:00:00 1970
From: b32955@freescale.com (Huang Shijie)
Date: Thu, 31 Mar 2011 17:08:54 +0800
Subject: [PATCH V3 2/6] dmaengine: add interrupt check for GPMI controller
In-Reply-To: <19860.16442.199644.984424@ipc1.ka-ro>
References: <19858.62649.218523.984252@ipc1.ka-ro>	<1301554968-29066-1-git-send-email-b32955@freescale.com>	<19860.13566.651111.241538@ipc1.ka-ro>	<4D94403F.6000000@freescale.com>
	<19860.16442.199644.984424@ipc1.ka-ro>
Message-ID: <4D9444A6.2060109@freescale.com>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

Hi,
> Hi,
>
> Huang Shijie writes:
>> Hi:
>>> Hi,
>>>
>>> Huang Shijie writes:
>>>> The GPMI may have many DMA channels, such as the imx23 has
>>>> four DMA channels. All these DMA channels share the same interrupt.
>>>> Add the interrupt check for the GPMI, only the first DMA channel will
>>>> register the irq.
>>>>
>>>> Signed-off-by: Huang Shijie<b32955@freescale.com>
>>>> ---
>>>>    drivers/dma/mxs-dma.c |   36 ++++++++++++++++++++++++++++++++----
>>>>    1 files changed, 32 insertions(+), 4 deletions(-)
>>>>
>>>> diff --git a/drivers/dma/mxs-dma.c b/drivers/dma/mxs-dma.c
>>>> index 88aad4f..db36bf1 100644
>>>> --- a/drivers/dma/mxs-dma.c
>>>> +++ b/drivers/dma/mxs-dma.c
>>>> @@ -26,6 +26,8 @@
>>>>    #include<asm/irq.h>
>>>>    #include<mach/mxs.h>
>>>>    #include<mach/dma.h>
>>>> +#include<mach/mx23.h>
>>>> +#include<mach/mx28.h>
>>>>    #include<mach/common.h>
>>>>
>>>>    /*
>>>> @@ -306,6 +308,30 @@ static irqreturn_t mxs_dma_int_handler(int irq, void *dev_id)
>>>>    	return IRQ_HANDLED;
>>>>    }
>>>>
>>>> +/* The GPMI has several DMA channels, only the first can register the irq. */
>>>> +static bool irq_check(struct mxs_dma_chan *mxs_chan)
>>>> +{
>>>> +	int irq_num = mxs_chan->chan_irq;
>>>> +
>>>> +#ifdef CONFIG_SOC_IMX23
>>>> +	if (cpu_is_mx23()&&   irq_num == MX23_INT_GPMI_DMA) {
>>>> +		if (mxs_chan->chan.chan_id == MX23_DMA_GPMI0)
>>>> +			return true;
>>>> +		else
>>>> +			return false;
>>>> +	}
>>>> +#endif
>>>> +#ifdef CONFIG_SOC_IMX28
>>>> +	if (cpu_is_mx28()&&   irq_num == MX28_INT_GPMI_DMA) {
>>>> +		if (mxs_chan->chan.chan_id == MX28_DMA_GPMI0)
>>>> +			return true;
>>>> +		else
>>>> +			return false;
>>>> +	}
>>>> +#endif
>>>> +	return true;
>>>> +}
>>>>
>>> You should make the distinction based on the platform_id, which would
>>> save you the ugly ifdef's and cpu_is_... macros.
>>>
>>>
>> This in the DMA driver.
>> Do you want me to change the DMA driver to add the platform_id?
>> The DMA driver has already used the cpu_is_xx() macros.
>>
> The mxs-dma driver is already using platform ids!
>
>
Do you mean the mxd_dma_type[] ?

How can i distinction the imx23 and imx28 with it ?
It seems can not be used to do the work.

thanks.

Huang Shijie


> Lothar Wa?mann