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Subject[PATCH v1 12/15] remoteproc: mediatek: Add SCP core 1 as a rproc subdevice
Date
Because the clock and SRAM power is controlled by SCP core 0, SCP core 1
has to be boot after SCP core 0. We use the rproc subdev to achieve this
purpose.

The watchdog timeout handler of SCP core 1 is added as part of the rproc
subdevice. This allows SCP core 0 to handle watchdog timeout coming from
SCP core 1.

Signed-off-by: Tinghan Shen <tinghan.shen@mediatek.com>
---
drivers/remoteproc/Makefile | 2 +-
drivers/remoteproc/mtk_common.h | 12 +++
drivers/remoteproc/mtk_scp.c | 32 +++++++
drivers/remoteproc/mtk_scp_dual.c | 8 ++
drivers/remoteproc/mtk_scp_subdev.c | 130 ++++++++++++++++++++++++++++
5 files changed, 183 insertions(+), 1 deletion(-)
create mode 100644 drivers/remoteproc/mtk_scp_subdev.c

diff --git a/drivers/remoteproc/Makefile b/drivers/remoteproc/Makefile
index 84cb687d28da..97f729f7c4ae 100644
--- a/drivers/remoteproc/Makefile
+++ b/drivers/remoteproc/Makefile
@@ -15,7 +15,7 @@ obj-$(CONFIG_IMX_REMOTEPROC) += imx_rproc.o
obj-$(CONFIG_IMX_DSP_REMOTEPROC) += imx_dsp_rproc.o
obj-$(CONFIG_INGENIC_VPU_RPROC) += ingenic_rproc.o
obj-$(CONFIG_MTK_SCP) += mtk_scp.o mtk_scp_ipi.o
-obj-$(CONFIG_MTK_SCP_DUALCORE) += mtk_scp_dual.o
+obj-$(CONFIG_MTK_SCP_DUALCORE) += mtk_scp_dual.o mtk_scp_subdev.o
obj-$(CONFIG_OMAP_REMOTEPROC) += omap_remoteproc.o
obj-$(CONFIG_WKUP_M3_RPROC) += wkup_m3_rproc.o
obj-$(CONFIG_DA8XX_REMOTEPROC) += da8xx_remoteproc.o
diff --git a/drivers/remoteproc/mtk_common.h b/drivers/remoteproc/mtk_common.h
index 7b363411ec99..a5c26e56277d 100644
--- a/drivers/remoteproc/mtk_common.h
+++ b/drivers/remoteproc/mtk_common.h
@@ -99,6 +99,14 @@ struct scp_ipi_desc {
void *priv;
};

+struct scp_subdev_core {
+ struct rproc_subdev subdev;
+ struct mtk_scp *main_scp;
+ void (*scp_dual_wdt_timeout)(struct mtk_scp *scp, u32 scp_to_host);
+};
+
+#define to_subdev_core(d) container_of(d, struct scp_subdev_core, subdev)
+
struct mtk_scp;

struct mtk_scp_of_data {
@@ -144,6 +152,7 @@ struct mtk_scp {
size_t dram_size;

struct rproc_subdev *rpmsg_subdev;
+ struct rproc_subdev *dual_subdev;
};

/**
@@ -172,4 +181,7 @@ int scp_map_memory_region(struct mtk_scp *scp);
void scp_unmap_memory_region(struct mtk_scp *scp);
irqreturn_t scp_irq_handler(int irq, void *priv);
void scp_ipi_handler(struct mtk_scp *scp);
+
+struct rproc_subdev *scp_dual_create_subdev(struct mtk_scp *scp);
+void scp_dual_destroy_subdev(struct rproc_subdev *subdev);
#endif
diff --git a/drivers/remoteproc/mtk_scp.c b/drivers/remoteproc/mtk_scp.c
index 55bc4e9d1a6f..c7bf0a44ba0d 100644
--- a/drivers/remoteproc/mtk_scp.c
+++ b/drivers/remoteproc/mtk_scp.c
@@ -231,6 +231,13 @@ static void mt8195_scp_irq_handler(struct mtk_scp *scp)
} else {
if (readl(scp->reg_base + MT8195_SYS_STATUS) & MT8195_CORE1_WDT) {
writel(1, scp->reg_base + MT8195_CORE1_WDT_IRQ);
+
+ if (scp->dual_subdev) {
+ struct scp_subdev_core *subdev_core;
+
+ subdev_core = to_subdev_core(scp->dual_subdev);
+ subdev_core->scp_dual_wdt_timeout(scp, scp_to_host);
+ }
} else {
writel(1, scp->reg_base + MT8192_CORE0_WDT_IRQ);
scp_wdt_handler(scp, scp_to_host);
@@ -836,6 +843,27 @@ static void scp_remove_rpmsg_subdev(struct mtk_scp *scp)
}
}

+static void scp_add_dual_subdev(struct mtk_scp *scp)
+{
+#if IS_ENABLED(CONFIG_MTK_SCP_DUALCORE)
+ scp->dual_subdev = scp_dual_create_subdev(scp);
+
+ if (scp->dual_subdev)
+ rproc_add_subdev(scp->rproc, scp->dual_subdev);
+#endif
+}
+
+static void scp_remove_dual_subdev(struct mtk_scp *scp)
+{
+#if IS_ENABLED(CONFIG_MTK_SCP_DUALCORE)
+ if (scp->dual_subdev) {
+ rproc_remove_subdev(scp->rproc, scp->dual_subdev);
+ scp_dual_destroy_subdev(scp->dual_subdev);
+ scp->dual_subdev = NULL;
+ }
+#endif
+}
+
static int scp_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
@@ -911,6 +939,8 @@ static int scp_probe(struct platform_device *pdev)

scp_add_rpmsg_subdev(scp);

+ scp_add_dual_subdev(scp);
+
ret = devm_request_threaded_irq(dev, platform_get_irq(pdev, 0), NULL,
scp_irq_handler, IRQF_ONESHOT,
pdev->name, scp);
@@ -927,6 +957,7 @@ static int scp_probe(struct platform_device *pdev)
return 0;

remove_subdev:
+ scp_remove_dual_subdev(scp);
scp_remove_rpmsg_subdev(scp);
scp_ipi_unregister(scp, SCP_IPI_INIT);
release_dev_mem:
@@ -944,6 +975,7 @@ static int scp_remove(struct platform_device *pdev)
int i;

rproc_del(scp->rproc);
+ scp_remove_dual_subdev(scp);
scp_remove_rpmsg_subdev(scp);
scp_ipi_unregister(scp, SCP_IPI_INIT);
scp_unmap_memory_region(scp);
diff --git a/drivers/remoteproc/mtk_scp_dual.c b/drivers/remoteproc/mtk_scp_dual.c
index 4e8d7f5cdad6..90c49716dd39 100644
--- a/drivers/remoteproc/mtk_scp_dual.c
+++ b/drivers/remoteproc/mtk_scp_dual.c
@@ -258,6 +258,14 @@ static int scp_dual_probe(struct platform_device *pdev)
goto remove_ipi;
}

+ /* disable auto boot before register rproc.
+ * it's booted as a subdevice of scp core 0.
+ */
+ rproc->auto_boot = false;
+ ret = devm_rproc_add(dev, rproc);
+ if (ret)
+ goto remove_ipi;
+
return 0;

remove_ipi:
diff --git a/drivers/remoteproc/mtk_scp_subdev.c b/drivers/remoteproc/mtk_scp_subdev.c
new file mode 100644
index 000000000000..197fb207c756
--- /dev/null
+++ b/drivers/remoteproc/mtk_scp_subdev.c
@@ -0,0 +1,130 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// Copyright (c) 2022 MediaTek Inc.
+
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+
+#include "mtk_common.h"
+
+#define SCP_MAIN_CORE 0
+#define SCP_DTS_CORE_ID 0
+#define SCP_DTS_CORE_REF 1
+
+static struct mtk_scp *scp_dual_get(struct mtk_scp *scp)
+{
+ struct device *dev = scp->dev;
+ struct device_node *np;
+ struct platform_device *dual_pdev;
+
+ np = of_parse_phandle(dev->of_node, "mediatek,scp-core", SCP_DTS_CORE_REF);
+ dual_pdev = of_find_device_by_node(np);
+ of_node_put(np);
+
+ if (!dual_pdev) {
+ dev_err(dev, "No scp-dual pdev\n");
+ return NULL;
+ }
+
+ return platform_get_drvdata(dual_pdev);
+}
+
+static void scp_dual_put(struct mtk_scp *scp)
+{
+ put_device(scp->dev);
+}
+
+static int scp_dual_rproc_start(struct rproc_subdev *subdev)
+{
+ struct scp_subdev_core *subdev_core = to_subdev_core(subdev);
+ struct mtk_scp *scp_dual;
+
+ scp_dual = scp_dual_get(subdev_core->main_scp);
+ if (!scp_dual)
+ return -ENODEV;
+
+ rproc_boot(scp_dual->rproc);
+ scp_dual_put(scp_dual);
+
+ return 0;
+}
+
+static void scp_dual_rproc_stop(struct rproc_subdev *subdev, bool crashed)
+{
+ struct scp_subdev_core *subdev_core = to_subdev_core(subdev);
+ struct mtk_scp *scp_dual;
+
+ scp_dual = scp_dual_get(subdev_core->main_scp);
+ if (!scp_dual)
+ return;
+
+ rproc_shutdown(scp_dual->rproc);
+ scp_dual_put(scp_dual);
+}
+
+static void scp_dual_wdt_handler(struct mtk_scp *scp, u32 scp_to_host)
+{
+ struct mtk_scp *scp_dual;
+
+ scp_dual = scp_dual_get(scp);
+ if (!scp_dual)
+ return;
+
+ dev_err(scp_dual->dev, "SCP watchdog timeout! 0x%x\n", scp_to_host);
+ rproc_report_crash(scp_dual->rproc, RPROC_WATCHDOG);
+ scp_dual_put(scp_dual);
+}
+
+struct rproc_subdev *scp_dual_create_subdev(struct mtk_scp *scp)
+{
+ struct device *dev = scp->dev;
+ struct scp_subdev_core *subdev_core;
+ struct device_node *np;
+ int ret, core_id;
+
+ ret = of_property_read_u32_index(dev->of_node, "mediatek,scp-core", SCP_DTS_CORE_ID,
+ &core_id);
+ if (ret < 0) {
+ dev_warn(dev, "No SCP core id\n");
+ return NULL;
+ }
+
+ if (core_id != SCP_MAIN_CORE) {
+ dev_dbg(dev, "SCP core id %d\n", core_id);
+ return NULL;
+ }
+
+ np = of_parse_phandle(dev->of_node, "mediatek,scp-core", SCP_DTS_CORE_REF);
+ if (!np) {
+ dev_err(dev, "Invalid mediatek,scp-core phandle\n");
+ return NULL;
+ }
+ of_node_put(np);
+
+ subdev_core = devm_kzalloc(dev, sizeof(*subdev_core), GFP_KERNEL);
+ if (!subdev_core)
+ return NULL;
+
+ subdev_core->main_scp = scp;
+ subdev_core->scp_dual_wdt_timeout = scp_dual_wdt_handler;
+ subdev_core->subdev.start = scp_dual_rproc_start;
+ subdev_core->subdev.stop = scp_dual_rproc_stop;
+
+ return &subdev_core->subdev;
+}
+EXPORT_SYMBOL_GPL(scp_dual_create_subdev);
+
+void scp_dual_destroy_subdev(struct rproc_subdev *subdev)
+{
+ struct scp_subdev_core *subdev_core = to_subdev_core(subdev);
+
+ devm_kfree(subdev_core->main_scp->dev, subdev_core);
+}
+EXPORT_SYMBOL_GPL(scp_dual_destroy_subdev);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("MediaTek scp dual core subdev interface");
--
2.18.0
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