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Date:   Wed, 20 Feb 2019 05:46:18 +0000
From:   Aisheng Dong <aisheng.dong@....com>
To:     Anson Huang <anson.huang@....com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        "a.zummo@...ertech.it" <a.zummo@...ertech.it>,
        "alexandre.belloni@...tlin.com" <alexandre.belloni@...tlin.com>,
        "ulf.hansson@...aro.org" <ulf.hansson@...aro.org>,
        Daniel Baluta <daniel.baluta@....com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-rtc@...r.kernel.org" <linux-rtc@...r.kernel.org>
CC:     dl-linux-imx <linux-imx@....com>
Subject: RE: [PATCH V3 2/4] firmware: imx: enable imx scu general irq function

> From: Anson Huang
> Sent: Tuesday, February 19, 2019 11:11 AM
> 
> The System Controller Firmware (SCFW) controls RTC, thermal and WDOG etc.,
> these resources' interrupt function are managed by SCU. When any IRQ
> pending, SCU will notify Linux via MU general interrupt channel #3, and Linux
> kernel needs to call SCU APIs to get IRQ status and notify each module to
> handle the interrupt.
> 
> Since there is no data transmission for SCU IRQ notification, so doorbell mode
> is used for this MU channel, and SCU driver will use notifier mechanism to
> broadcast to every module which registers the SCU block notifier.
> 
> Signed-off-by: Anson Huang <Anson.Huang@....com>
> ---
> No change since V2.
> ---
>  drivers/firmware/imx/imx-scu.c   | 101
> +++++++++++++++++++++++++++++++++++++++
>  include/linux/firmware/imx/sci.h |   3 ++
>  2 files changed, 104 insertions(+)
> 
> diff --git a/drivers/firmware/imx/imx-scu.c b/drivers/firmware/imx/imx-scu.c
> index 2bb1a19..e93bea5 100644
> --- a/drivers/firmware/imx/imx-scu.c
> +++ b/drivers/firmware/imx/imx-scu.c
> @@ -7,6 +7,7 @@
>   *
>   */
> 
> +#include <dt-bindings/firmware/imx/rsrc.h>
>  #include <linux/err.h>
>  #include <linux/firmware/imx/types.h>
>  #include <linux/firmware/imx/ipc.h>
> @@ -21,6 +22,8 @@
> 
>  #define SCU_MU_CHAN_NUM		8
>  #define MAX_RX_TIMEOUT		(msecs_to_jiffies(30))
> +#define IMX_SC_IRQ_FUNC_STATUS	2
> +#define IMX_SC_IRQ_NUM_GROUP	6
> 
>  struct imx_sc_chan {
>  	struct imx_sc_ipc *sc_ipc;
> @@ -77,7 +80,23 @@ static int imx_sc_linux_errmap[IMX_SC_ERR_LAST] = {
>  	-EIO,	 /* IMX_SC_ERR_FAIL */
>  };
> 
> +struct imx_sc_msg_irq_get_status {
> +	struct imx_sc_rpc_msg hdr;
> +	union {
> +		struct {
> +			u16 resource;
> +			u8 group;
> +			u8 reserved;
> +		} send;

} __packed req

> +		struct {
> +			u32 status;
> +		} receive;

resp

> +	} data;
> +} __packed;

No need __packed anymore

> +
>  static struct imx_sc_ipc *imx_sc_ipc_handle;
> +static struct work_struct imx_sc_general_irq_work; static
> +BLOCKING_NOTIFIER_HEAD(imx_scu_notifier_chain);
> 
>  static inline int imx_sc_to_linux_errno(int errno)  { @@ -194,6 +213,86 @@
> int imx_scu_call_rpc(struct imx_sc_ipc *sc_ipc, void *msg, bool have_resp)  }
> EXPORT_SYMBOL(imx_scu_call_rpc);
> 
> +int imx_scu_register_notifier(struct notifier_block *nb) {
> +	return blocking_notifier_chain_register(&imx_scu_notifier_chain, nb);
> +} EXPORT_SYMBOL(imx_scu_register_notifier);
> +
> +int imx_scu_unregister_notifier(struct notifier_block *nb) {
> +	return blocking_notifier_chain_unregister(&imx_scu_notifier_chain,
> +nb); } EXPORT_SYMBOL(imx_scu_unregister_notifier);
> +
> +static int imx_scu_notifier_call_chain(unsigned long status, u8 *group)
> +{
> +	return blocking_notifier_call_chain(&imx_scu_notifier_chain,
> +					    status, (void *)group);
> +}
> +
> +static void imx_scu_general_irq_work_handler(struct work_struct *work)
> +{
> +	struct imx_sc_msg_irq_get_status msg;
> +	struct imx_sc_rpc_msg *hdr = &msg.hdr;
> +	u32 irq_status;
> +	int ret;
> +	u8 i;
> +
> +	for (i = 0; i < IMX_SC_IRQ_NUM_GROUP; i++) {
> +		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.send.resource = IMX_SC_R_MU_1A;

Please make sure if it's fixed to MU_1A.

> +		msg.data.send.group = i;
> +
> +		ret = imx_scu_call_rpc(imx_sc_ipc_handle, &msg, true);
> +		if (ret) {
> +			pr_err("get irq status failed, ret %d\n", ret);
> +			return;
> +		}
> +
> +		irq_status = msg.data.receive.status;
> +		if (!irq_status)
> +			continue;
> +
> +		imx_scu_notifier_call_chain(irq_status, &i);
> +	}
> +}
> +
> +static void imx_scu_rxdb_callback(struct mbox_client *c, void *msg) {
> +	schedule_work(&imx_sc_general_irq_work);
> +}
> +
> +static int imx_scu_enable_general_irq_channel(struct device *dev) {
> +	struct mbox_client *cl;
> +	struct mbox_chan *ch;
> +	int ret = 0;
> +
> +	cl = devm_kzalloc(dev, sizeof(*cl), GFP_KERNEL);
> +	if (!cl)
> +		return -ENOMEM;
> +
> +	cl->dev = dev;
> +	cl->rx_callback = imx_scu_rxdb_callback;
> +
> +	/* SCU general IRQ uses general interrupt channel 3 */
> +	ch = mbox_request_channel_byname(cl, "gi3");
> +	if (IS_ERR(ch)) {
> +		ret = PTR_ERR(ch);
> +		dev_err(dev, "failed to request mbox chan gi3, ret %d\n", ret);
> +		return ret;

return PTR_ERR(ch)

> +	}
> +
> +	INIT_WORK(&imx_sc_general_irq_work,
> imx_scu_general_irq_work_handler);
> +
> +	return ret;
> +}
> +
>  static int imx_scu_probe(struct platform_device *pdev)  {
>  	struct device *dev = &pdev->dev;
> @@ -246,6 +345,8 @@ static int imx_scu_probe(struct platform_device
> *pdev)
> 
>  	imx_sc_ipc_handle = sc_ipc;
> 
> +	imx_scu_enable_general_irq_channel(dev);
> +

Check return in case a failure

Regards
Dong Aisheng

>  	dev_info(dev, "NXP i.MX SCU Initialized\n");
> 
>  	return devm_of_platform_populate(dev); diff --git
> a/include/linux/firmware/imx/sci.h b/include/linux/firmware/imx/sci.h
> index ebc5509..9d608db 100644
> --- a/include/linux/firmware/imx/sci.h
> +++ b/include/linux/firmware/imx/sci.h
> @@ -15,4 +15,7 @@
> 
>  #include <linux/firmware/imx/svc/misc.h>  #include
> <linux/firmware/imx/svc/pm.h>
> +
> +int imx_scu_register_notifier(struct notifier_block *nb); int
> +imx_scu_unregister_notifier(struct notifier_block *nb);
>  #endif /* _SC_SCI_H */
> --
> 2.7.4

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