From: Anson Huang <anson.huang@nxp.com>
To: "robh+dt@kernel.org" <robh+dt@kernel.org>,
"mark.rutland@arm.com" <mark.rutland@arm.com>,
"shawnguo@kernel.org" <shawnguo@kernel.org>,
"s.hauer@pengutronix.de" <s.hauer@pengutronix.de>,
"kernel@pengutronix.de" <kernel@pengutronix.de>,
"festevam@gmail.com" <festevam@gmail.com>,
"a.zummo@towertech.it" <a.zummo@towertech.it>,
"alexandre.belloni@bootlin.com" <alexandre.belloni@bootlin.com>,
Aisheng Dong <aisheng.dong@nxp.com>,
"ulf.hansson@linaro.org" <ulf.hansson@linaro.org>,
"sboyd@kernel.org" <sboyd@kernel.org>,
Peng Fan <peng.fan@nxp.com>,
Daniel Baluta <daniel.baluta@nxp.com>,
"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
"linux-rtc@vger.kernel.org" <linux-rtc@vger.kernel.org>
Cc: dl-linux-imx <linux-imx@nxp.com>
Subject: [PATCH V7 2/4] firmware: imx: enable imx scu general irq function
Date: Tue, 9 Apr 2019 04:59:55 +0000 [thread overview]
Message-ID: <1554785675-8090-2-git-send-email-Anson.Huang@nxp.com> (raw)
In-Reply-To: <1554785675-8090-1-git-send-email-Anson.Huang@nxp.com>
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@nxp.com>
Reviewed-by: Dong Aisheng <aisheng.dong@nxp.com>
---
Changes since V6:
- improve imx_scu_irq_enable() function name to imx_scu_irq_group_enable();
- make imx_scu_irq_group_enable() function return int;
---
drivers/firmware/imx/Makefile | 2 +-
drivers/firmware/imx/imx-scu-irq.c | 168 +++++++++++++++++++++++++++++++++++++
drivers/firmware/imx/imx-scu.c | 6 ++
include/linux/firmware/imx/sci.h | 5 ++
4 files changed, 180 insertions(+), 1 deletion(-)
create mode 100644 drivers/firmware/imx/imx-scu-irq.c
diff --git a/drivers/firmware/imx/Makefile b/drivers/firmware/imx/Makefile
index 1b2e15b..802c4ad 100644
--- a/drivers/firmware/imx/Makefile
+++ b/drivers/firmware/imx/Makefile
@@ -1,3 +1,3 @@
# SPDX-License-Identifier: GPL-2.0
-obj-$(CONFIG_IMX_SCU) += imx-scu.o misc.o
+obj-$(CONFIG_IMX_SCU) += imx-scu.o misc.o imx-scu-irq.o
obj-$(CONFIG_IMX_SCU_PD) += scu-pd.o
diff --git a/drivers/firmware/imx/imx-scu-irq.c b/drivers/firmware/imx/imx-scu-irq.c
new file mode 100644
index 0000000..043833a
--- /dev/null
+++ b/drivers/firmware/imx/imx-scu-irq.c
@@ -0,0 +1,168 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2019 NXP
+ *
+ * Implementation of the SCU IRQ functions using MU.
+ *
+ */
+
+#include <dt-bindings/firmware/imx/rsrc.h>
+#include <linux/firmware/imx/ipc.h>
+#include <linux/mailbox_client.h>
+
+#define IMX_SC_IRQ_FUNC_ENABLE 1
+#define IMX_SC_IRQ_FUNC_STATUS 2
+#define IMX_SC_IRQ_NUM_GROUP 4
+
+static u32 mu_resource_id;
+
+struct imx_sc_msg_irq_get_status {
+ struct imx_sc_rpc_msg hdr;
+ union {
+ struct {
+ u16 resource;
+ u8 group;
+ u8 reserved;
+ } __packed req;
+ struct {
+ u32 status;
+ } resp;
+ } data;
+};
+
+struct imx_sc_msg_irq_enable {
+ struct imx_sc_rpc_msg hdr;
+ u32 mask;
+ u16 resource;
+ u8 group;
+ u8 enable;
+} __packed;
+
+static struct imx_sc_ipc *imx_sc_irq_ipc_handle;
+static struct work_struct imx_sc_irq_work;
+static ATOMIC_NOTIFIER_HEAD(imx_scu_irq_notifier_chain);
+
+int imx_scu_irq_register_notifier(struct notifier_block *nb)
+{
+ return atomic_notifier_chain_register(
+ &imx_scu_irq_notifier_chain, nb);
+}
+EXPORT_SYMBOL(imx_scu_irq_register_notifier);
+
+int imx_scu_irq_unregister_notifier(struct notifier_block *nb)
+{
+ return atomic_notifier_chain_unregister(
+ &imx_scu_irq_notifier_chain, nb);
+}
+EXPORT_SYMBOL(imx_scu_irq_unregister_notifier);
+
+static int imx_scu_irq_notifier_call_chain(unsigned long status, u8 *group)
+{
+ return atomic_notifier_call_chain(&imx_scu_irq_notifier_chain,
+ status, (void *)group);
+}
+
+static void imx_scu_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.req.resource = mu_resource_id;
+ msg.data.req.group = i;
+
+ ret = imx_scu_call_rpc(imx_sc_irq_ipc_handle, &msg, true);
+ if (ret) {
+ pr_err("get irq group %d status failed, ret %d\n",
+ i, ret);
+ return;
+ }
+
+ irq_status = msg.data.resp.status;
+ if (!irq_status)
+ continue;
+
+ imx_scu_irq_notifier_call_chain(irq_status, &i);
+ }
+}
+
+int imx_scu_irq_group_enable(u8 group, u32 mask, u8 enable)
+{
+ struct imx_sc_msg_irq_enable 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_ENABLE;
+ hdr->size = 3;
+
+ msg.resource = mu_resource_id;
+ msg.group = group;
+ msg.mask = mask;
+ msg.enable = enable;
+
+ ret = imx_scu_call_rpc(imx_sc_irq_ipc_handle, &msg, true);
+ if (ret)
+ pr_err("enable irq failed, group %d, mask %d, ret %d\n",
+ group, mask, ret);
+
+ return ret;
+}
+EXPORT_SYMBOL(imx_scu_irq_group_enable);
+
+static void imx_scu_irq_callback(struct mbox_client *c, void *msg)
+{
+ schedule_work(&imx_sc_irq_work);
+}
+
+int imx_scu_enable_general_irq_channel(struct device *dev)
+{
+ struct of_phandle_args spec;
+ struct mbox_client *cl;
+ struct mbox_chan *ch;
+ int ret = 0, i = 0;
+
+ ret = imx_scu_get_handle(&imx_sc_irq_ipc_handle);
+ if (ret)
+ return ret;
+
+ cl = devm_kzalloc(dev, sizeof(*cl), GFP_KERNEL);
+ if (!cl)
+ return -ENOMEM;
+
+ cl->dev = dev;
+ cl->rx_callback = imx_scu_irq_callback;
+
+ /* SCU general IRQ uses general interrupt channel 3 */
+ ch = mbox_request_channel_byname(cl, "gip3");
+ if (IS_ERR(ch)) {
+ ret = PTR_ERR(ch);
+ dev_err(dev, "failed to request mbox chan gip3, ret %d\n", ret);
+ devm_kfree(dev, cl);
+ return ret;
+ }
+
+ INIT_WORK(&imx_sc_irq_work, imx_scu_irq_work_handler);
+
+ if (!of_parse_phandle_with_args(dev->of_node, "mboxes",
+ "#mbox-cells", 0, &spec))
+ i = of_alias_get_id(spec.np, "mu");
+
+ /* use mu1 as general mu irq channel if failed */
+ if (i < 0)
+ i = 1;
+
+ mu_resource_id = IMX_SC_R_MU_0A + i;
+
+ return ret;
+}
+EXPORT_SYMBOL(imx_scu_enable_general_irq_channel);
diff --git a/drivers/firmware/imx/imx-scu.c b/drivers/firmware/imx/imx-scu.c
index 2bb1a19..04a24a8 100644
--- a/drivers/firmware/imx/imx-scu.c
+++ b/drivers/firmware/imx/imx-scu.c
@@ -10,6 +10,7 @@
#include <linux/err.h>
#include <linux/firmware/imx/types.h>
#include <linux/firmware/imx/ipc.h>
+#include <linux/firmware/imx/sci.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/kernel.h>
@@ -246,6 +247,11 @@ static int imx_scu_probe(struct platform_device *pdev)
imx_sc_ipc_handle = sc_ipc;
+ ret = imx_scu_enable_general_irq_channel(dev);
+ if (ret)
+ dev_warn(dev,
+ "failed to enable general irq channel: %d\n", ret);
+
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..17ba4e4 100644
--- a/include/linux/firmware/imx/sci.h
+++ b/include/linux/firmware/imx/sci.h
@@ -15,4 +15,9 @@
#include <linux/firmware/imx/svc/misc.h>
#include <linux/firmware/imx/svc/pm.h>
+
+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);
#endif /* _SC_SCI_H */
--
2.7.4
next prev parent reply other threads:[~2019-04-09 5:00 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-09 4:59 [PATCH V7 1/4] dt-bindings: fsl: scu: add general interrupt support Anson Huang
2019-04-09 4:59 ` Anson Huang [this message]
2019-04-11 7:32 ` [PATCH V7 2/4] firmware: imx: enable imx scu general irq function Shawn Guo
2019-04-12 1:05 ` [EXT] " Anson Huang
2019-04-12 2:25 ` Aisheng Dong
2019-04-12 2:32 ` Anson Huang
2019-04-12 8:41 ` Alexandre Belloni
2019-04-15 9:23 ` Shawn Guo
2019-04-09 5:00 ` [PATCH V7 3/4] arm64: dts: freescale: imx8qxp: enable scu general irq channel Anson Huang
2019-04-11 7:34 ` Shawn Guo
2019-04-09 5:00 ` [PATCH V7 4/4] rtc: imx-sc: add rtc alarm support Anson Huang
2019-04-12 8:41 ` Alexandre Belloni
2019-06-01 21:18 ` Alexandre Belloni
2019-04-11 1:37 ` [PATCH V7 1/4] dt-bindings: fsl: scu: add general interrupt support Anson Huang
2019-04-11 7:32 ` Shawn Guo
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1554785675-8090-2-git-send-email-Anson.Huang@nxp.com \
--to=anson.huang@nxp.com \
--cc=a.zummo@towertech.it \
--cc=aisheng.dong@nxp.com \
--cc=alexandre.belloni@bootlin.com \
--cc=daniel.baluta@nxp.com \
--cc=devicetree@vger.kernel.org \
--cc=festevam@gmail.com \
--cc=kernel@pengutronix.de \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-imx@nxp.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-rtc@vger.kernel.org \
--cc=mark.rutland@arm.com \
--cc=peng.fan@nxp.com \
--cc=robh+dt@kernel.org \
--cc=s.hauer@pengutronix.de \
--cc=sboyd@kernel.org \
--cc=shawnguo@kernel.org \
--cc=ulf.hansson@linaro.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).