From: majun258@huawei•com (majun (F))
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH v2 4/5] irqchip:create irq domain for each mbigen device
Date: Wed, 17 Feb 2016 12:18:52 +0800 [thread overview]
Message-ID: <56C3F4AC.8020807@huawei.com> (raw)
In-Reply-To: <20160216085024.3f573f40@arm.com>
? 2016/2/16 16:50, Marc Zyngier ??:
> On Tue, 16 Feb 2016 14:37:27 +0800
> MaJun <majun258@huawei•com> wrote:
>
>> From: Ma Jun <majun258@huawei•com>
[...]
>> + unsigned int nid;
>> +
>> + nid = get_mbigen_nid(hwirq);
>> +
>> + if (nid < 4)
>> + return (nid * 4) + REG_MBIGEN_VEC_OFFSET;
>> + else
>> + return (nid - 4) * 4 + REG_MBIGEN_EXT_VEC_OFFSET;
>> +}
>> +
>> +static struct irq_chip mbigen_irq_chip = {
>> + .name = "mbigen-v1",
>> +};
>> +
>> +static void mbigen_write_msg(struct msi_desc *desc, struct msi_msg *msg)
>> +{
>> + /* The address of doorbell is encoded in mbigen register by default
>> + * So,we don't need to program the doorbell address at here
>> + * Besides, the event ID is decided by the hardware pin number,
>> + * we can't change it in software.So, we don't need to encode the
>> + * event ID in mbigen register.
>> + */
>
> Really? What if tomorrow I decide to change the EventID allocation
> policy in the ITS driver? Have your HW engineers really baked the
> behaviour of the Linux driver into the device?
>
Yes.
If we really need to support this chip,is there
any possible solution for this problem?
Thanks!
MaJun
> I'm puzzled.
>
> M.
>
next prev parent reply other threads:[~2016-02-17 4:18 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-16 6:37 [PATCH v2 0/5] irqchip: Add support for Hisilicon mbigen v1 chip MaJun
2016-02-16 6:37 ` [PATCH v2 1/5] dt-binding: Change the mbigen binding file to support the mbigen-v1 MaJun
2016-02-16 6:37 ` [PATCH v2 2/5] dt-binding:Rename the mbigen binding file name MaJun
2016-02-16 6:37 ` [PATCH v2 3/5] irqchip: add platform device driver for mbigen device MaJun
2016-02-16 6:37 ` [PATCH v2 4/5] irqchip:create irq domain for each " MaJun
2016-02-16 8:50 ` Marc Zyngier
2016-02-17 4:18 ` majun (F) [this message]
2016-02-17 7:47 ` Marc Zyngier
2016-02-16 6:37 ` [PATCH v2 5/5] irqchip:implement the mbigen irq chip operation functions MaJun
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