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Subject[PATCH v2 7/9] 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/mtk_common.h | 9 +++
drivers/remoteproc/mtk_scp.c | 130 ++++++++++++++++++++++++++++++++
2 files changed, 139 insertions(+)

diff --git a/drivers/remoteproc/mtk_common.h b/drivers/remoteproc/mtk_common.h
index 5582f4207fbf..67b41866a100 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;
};

/**
diff --git a/drivers/remoteproc/mtk_scp.c b/drivers/remoteproc/mtk_scp.c
index b8a4db581179..d0e9e19e251f 100644
--- a/drivers/remoteproc/mtk_scp.c
+++ b/drivers/remoteproc/mtk_scp.c
@@ -244,6 +244,13 @@ 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);
@@ -925,6 +932,118 @@ static void scp_remove_rpmsg_subdev(struct mtk_scp *scp)
}
}

+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", 0);
+ 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);
+}
+
+static 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;
+
+ np = of_parse_phandle(dev->of_node, "mediatek,scp-core", 0);
+ if (!np)
+ 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;
+}
+
+static 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);
+}
+
+static void scp_add_dual_subdev(struct mtk_scp *scp)
+{
+ scp->dual_subdev = scp_dual_create_subdev(scp);
+
+ if (scp->dual_subdev)
+ rproc_add_subdev(scp->rproc, scp->dual_subdev);
+}
+
+static void scp_remove_dual_subdev(struct mtk_scp *scp)
+{
+ if (scp->dual_subdev) {
+ rproc_remove_subdev(scp->rproc, scp->dual_subdev);
+ scp_dual_destroy_subdev(scp->dual_subdev);
+ scp->dual_subdev = NULL;
+ }
+}
+
static int scp_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
@@ -1014,6 +1133,9 @@ static int scp_probe(struct platform_device *pdev)

scp_add_rpmsg_subdev(scp);

+ if (core_id == SCP_CORE_0)
+ 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);
@@ -1023,6 +1145,12 @@ static int scp_probe(struct platform_device *pdev)
goto remove_subdev;
}

+ /* disable auto boot before register rproc.
+ * scp core 1 is booted as a subdevice of scp core 0.
+ */
+ if (core_id == SCP_CORE_1)
+ rproc->auto_boot = false;
+
ret = rproc_add(rproc);
if (ret)
goto remove_subdev;
@@ -1030,6 +1158,7 @@ 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:
@@ -1047,6 +1176,7 @@ 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);
--
2.18.0
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