linux-kernel - RE: [PATCH v2 2/5] firmware: imx: scu-irq: Add API to retrieve status of IRQ

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Message-ID: <AM6PR04MB4966953E346F9C0BF9BC581780010@AM6PR04MB4966.eurprd04.prod.outlook.com>
Date:   Sun, 18 Oct 2020 04:48:44 +0000
From:   Aisheng Dong <aisheng.dong@....com>
To:     "Franck Lenormand (OSS)" <franck.lenormand@....nxp.com>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>
CC:     "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        dl-linux-imx <linux-imx@....com>, Abel Vesa <abel.vesa@....com>,
        Anson Huang <anson.huang@....com>,
        "linux@...pel-privat.de" <linux@...pel-privat.de>,
        Leonard Crestez <leonard.crestez@....com>,
        Daniel Baluta <daniel.baluta@....com>,
        Joakim Zhang <qiangqing.zhang@....com>,
        Peng Fan <peng.fan@....com>
Subject: RE: [PATCH v2 2/5] firmware: imx: scu-irq: Add API to retrieve status
 of IRQ

> From: Franck Lenormand (OSS) <franck.lenormand@....nxp.com>
> Sent: Tuesday, July 21, 2020 11:21 PM
> 
> This patch adds the API to retrieve the status of an IRQ.
> 
> It also adds values used to process SECVIO IRQ from the SCU.
> 
> Signed-off-by: Franck LENORMAND <franck.lenormand@....nxp.com>
> ---
>  drivers/firmware/imx/imx-scu-irq.c | 37
> ++++++++++++++++++++++++++++++++++++-
>  include/linux/firmware/imx/sci.h   |  4 ++++
>  2 files changed, 40 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/firmware/imx/imx-scu-irq.c
> b/drivers/firmware/imx/imx-scu-irq.c
> index d9dcc20..d31d600 100644
> --- a/drivers/firmware/imx/imx-scu-irq.c
> +++ b/drivers/firmware/imx/imx-scu-irq.c
> @@ -1,6 +1,6 @@
>  // SPDX-License-Identifier: GPL-2.0+
>  /*
> - * Copyright 2019 NXP
> + * Copyright 2019-2020 NXP
>   *
>   * Implementation of the SCU IRQ functions using MU.
>   *
> @@ -97,6 +97,41 @@ static void imx_scu_irq_work_handler(struct
> work_struct *work)
>  	}
>  }
> 
> +/**
> + * imx_scu_irq_get_status() - Get the status of the IRQs of a group

This API is a little duplicated with the exist imx_scu_irq_work_handler.
Can we refactor the exist code into this API?

Regards
Aisheng

> + *
> + * @group: The group of IRQ to retrieve status
> + * @irq_status: Status of the IRQs retrieved
> + *
> + * Return:
> + * 0 - OK
> + * < 0 - error.
> + */
> +int imx_scu_irq_get_status(u8 group, u32 *irq_status) {
> +	struct imx_sc_msg_irq_get_status msg;
> +	struct imx_sc_rpc_msg *hdr = &msg.hdr;
> +	int ret;
> +
> +	hdr->ver = IMX_SC_RPC_VERSION;
> +	hdr->svc = IMX_SC_RPC_SVC_IRQ;
> +	hdr->func = IMX_SC_IRQ_FUNC_STATUS;
> +	hdr->size = 2;
> +
> +	msg.data.req.resource = mu_resource_id;
> +	msg.data.req.group = group;
> +
> +	ret = imx_scu_call_rpc(imx_sc_irq_ipc_handle, &msg, true);
> +	if (ret)
> +		return ret;
> +
> +	if (irq_status)
> +		*irq_status = msg.data.resp.status;
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL(imx_scu_irq_get_status);
> +
>  int imx_scu_irq_group_enable(u8 group, u32 mask, u8 enable)  {
>  	struct imx_sc_msg_irq_enable msg;
> diff --git a/include/linux/firmware/imx/sci.h b/include/linux/firmware/imx/sci.h
> index 914dce1..20a16a7 100644
> --- a/include/linux/firmware/imx/sci.h
> +++ b/include/linux/firmware/imx/sci.h
> @@ -17,9 +17,13 @@
>  #include <linux/firmware/imx/svc/rm.h>
>  #include <linux/firmware/imx/svc/seco.h>
> 
> +#define IMX_SC_IRQ_GROUP_WAKE       3U /* Wakeup interrupts */
> +#define IMX_SC_IRQ_SECVIO            BIT(6)    /* Security violation */
> +
>  int imx_scu_enable_general_irq_channel(struct device *dev);  int
> imx_scu_irq_register_notifier(struct notifier_block *nb);  int
> imx_scu_irq_unregister_notifier(struct notifier_block *nb);  int
> imx_scu_irq_group_enable(u8 group, u32 mask, u8 enable);  int
> imx_scu_soc_init(struct device *dev);
> +int imx_scu_irq_get_status(u8 group, u32 *irq_status);
>  #endif /* _SC_SCI_H */
> --
> 2.7.4