Re: [PATCH v4 07/12] remoteproc: mediatek: Probe multi-core SCP
From: AngeloGioacchino Del Regno
Date: Thu Feb 09 2023 - 07:42:07 EST
Il 09/02/23 08:40, Tinghan Shen ha scritto:
The difference of single-core SCP and multi-core SCP device tree is
the presence of child device nodes described SCP cores. The SCP
driver populates the platform device and checks the child nodes
to identify whether it's a single-core SCP or a multi-core SCP.
The resource structure of the multi-core SCP is a list of remoteproc
instances which is different to the single-core SCP. The corresponding
resource releasing action is added based on the type of SCP.
Signed-off-by: Tinghan Shen <tinghan.shen@xxxxxxxxxxxx>
---
drivers/remoteproc/mtk_common.h | 7 ++
drivers/remoteproc/mtk_scp.c | 173 ++++++++++++++++++++++++++++----
2 files changed, 160 insertions(+), 20 deletions(-)
diff --git a/drivers/remoteproc/mtk_common.h b/drivers/remoteproc/mtk_common.h
index 20c1a90be77d..0b2c4bbb55f0 100644
--- a/drivers/remoteproc/mtk_common.h
+++ b/drivers/remoteproc/mtk_common.h
@@ -119,6 +119,10 @@ struct mtk_scp_of_regs {
phys_addr_t l1tcm_phys;
};
+struct mtk_scp_cluster {
+ struct list_head cores;
+};
+
struct mtk_scp {
struct device *dev;
struct rproc *rproc;
@@ -147,6 +151,9 @@ struct mtk_scp {
size_t dram_size;
struct rproc_subdev *rpmsg_subdev;
+
+ struct list_head elem;
+ struct mtk_scp_cluster *cluster;
};
/**
diff --git a/drivers/remoteproc/mtk_scp.c b/drivers/remoteproc/mtk_scp.c
index feebcadd56cd..a25141c6c4cb 100644
--- a/drivers/remoteproc/mtk_scp.c
+++ b/drivers/remoteproc/mtk_scp.c
@@ -855,7 +855,9 @@ static void scp_remove_rpmsg_subdev(struct mtk_scp *scp)
}
static int scp_rproc_init(struct platform_device *pdev,
- struct mtk_scp_of_regs *of_regs)
+ struct mtk_scp_of_regs *of_regs,
+ const struct mtk_scp_of_data *of_data,
+ struct mtk_scp_cluster *cluster)
{
struct device *dev = &pdev->dev;
struct device_node *np = dev->of_node;
@@ -876,7 +878,8 @@ static int scp_rproc_init(struct platform_device *pdev,
scp = (struct mtk_scp *)rproc->priv;
scp->rproc = rproc;
scp->dev = dev;
- scp->data = of_device_get_match_data(dev);
+ scp->data = of_data;
+ scp->cluster = cluster;
platform_set_drvdata(pdev, scp);
scp->reg_base = of_regs->reg_base;
@@ -925,9 +928,13 @@ static int scp_rproc_init(struct platform_device *pdev,
goto remove_subdev;
}
- ret = rproc_add(rproc);
- if (ret)
- goto remove_subdev;
+ if (scp->cluster) {
+ list_add_tail(&scp->elem, &scp->cluster->cores);
+ } else {
+ ret = rproc_add(rproc);
+ if (ret)
+ goto remove_subdev;
+ }
return 0;
@@ -943,11 +950,115 @@ static int scp_rproc_init(struct platform_device *pdev,
return ret;
}
+static void scp_rproc_free(struct mtk_scp *scp)
+{
+ int i;
+
+ scp_remove_rpmsg_subdev(scp);
+ scp_ipi_unregister(scp, SCP_IPI_INIT);
+ scp_unmap_memory_region(scp);
+ for (i = 0; i < SCP_IPI_MAX; i++)
+ mutex_destroy(&scp->ipi_desc[i].lock);
+ mutex_destroy(&scp->send_lock);
+}
+
+static void scp_rproc_exit(void *data)
+{
+ struct mtk_scp *scp = platform_get_drvdata(data);
+
+ rproc_del(scp->rproc);
+ scp_rproc_free(scp);
+}
+
+static int scp_cluster_init(struct platform_device *pdev,
+ struct mtk_scp_of_regs *of_regs)
+{
+ struct mtk_scp_cluster *cluster = platform_get_drvdata(pdev);
+ struct device *dev = &pdev->dev;
+ struct device_node *np = dev_of_node(dev);
+ struct platform_device *cpdev;
+ struct device_node *child;
+ const struct mtk_scp_of_data **cluster_of_data;
+ struct mtk_scp *scp, *temp;
+ int core_id, num_cores;
+ int ret;
+
+ cluster_of_data = (const struct mtk_scp_of_data **)of_device_get_match_data(dev);
+
+ for (num_cores = 0; cluster_of_data[num_cores]; num_cores++)
+ ;
+
+ core_id = 0;
+ for_each_available_child_of_node(np, child) {
+ if (core_id >= num_cores) {
+ ret = -EINVAL;
+ dev_err(dev, "Not support core %d\n", core_id);
+ of_node_put(child);
+ goto init_fail;
+ }
+
+ cpdev = of_find_device_by_node(child);
+ if (!cpdev) {
+ ret = -ENODEV;
+ dev_err(dev, "Not found platform device for core %d\n", core_id);
+ of_node_put(child);
+ goto init_fail;
+ }
+
+ ret = scp_rproc_init(cpdev, of_regs, cluster_of_data[core_id], cluster);
+ put_device(&cpdev->dev);
+ if (ret) {
+ dev_err(dev, "Failed to initialize core %d rproc\n", core_id);
+ of_node_put(child);
+ goto init_fail;
+ }
+
+ of_node_put(child);
+ core_id++;
+ }
+
+ list_for_each_entry_safe_reverse(scp, temp, &cluster->cores, elem) {
+ ret = rproc_add(scp->rproc);
+ if (ret)
+ goto add_fail;
+ }
+
+ return 0;
+
+add_fail:
+ list_for_each_entry_continue(scp, &cluster->cores, elem) {
+ rproc_del(scp->rproc);
+ }
+init_fail:
+ list_for_each_entry_safe_reverse(scp, temp, &cluster->cores, elem) {
+ list_del(&scp->elem);
+ cpdev = to_platform_device(scp->dev);
+ scp_rproc_free(scp);
+ }
+ return ret;
+}
+
+static void scp_cluster_exit(void *data)
+{
+ struct mtk_scp_cluster *cluster = platform_get_drvdata(data);
+ struct platform_device *cpdev;
+ struct mtk_scp *scp, *temp;
+
+ list_for_each_entry_safe_reverse(scp, temp, &cluster->cores, elem) {
+ list_del(&scp->elem);
+ cpdev = to_platform_device(scp->dev);
+ scp_rproc_exit(cpdev);
+ }
+}
+
static int scp_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
+ struct device_node *np = dev->of_node;
+ struct device_node *core_node;
struct resource *res;
struct mtk_scp_of_regs scp_regs;
+ struct mtk_scp_cluster *cluster;
int ret;
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "cfg");
@@ -968,23 +1079,39 @@ static int scp_probe(struct platform_device *pdev)
scp_regs.l1tcm_phys = res->start;
}
- return scp_rproc_init(pdev, of_device_get_match_data(dev), &scp_regs);
-}
+ ret = devm_of_platform_populate(dev);
+ if (ret)
+ return dev_err_probe(dev, ret, "Failed to populate platform devices\n");
-static int scp_remove(struct platform_device *pdev)
-{
- struct mtk_scp *scp = platform_get_drvdata(pdev);
- int i;
+ core_node = of_get_child_by_name(np, "scp");
+ of_node_put(core_node);
- rproc_del(scp->rproc);
- scp_remove_rpmsg_subdev(scp);
- scp_ipi_unregister(scp, SCP_IPI_INIT);
- scp_unmap_memory_region(scp);
- for (i = 0; i < SCP_IPI_MAX; i++)
- mutex_destroy(&scp->ipi_desc[i].lock);
- mutex_destroy(&scp->send_lock);
+ if (!core_node) {
+ dev_info(dev, "single-core scp\n");
- return 0;
+ ret = scp_rproc_init(pdev, &scp_regs, of_device_get_match_data(dev), NULL);
+ if (ret)
+ return dev_err_probe(dev, ret, "Failed to init single core scp\n");
+
+ ret = devm_add_action_or_reset(dev, scp_rproc_exit, pdev);
+ } else {
+ dev_info(dev, "multi-core scp\n");
+
+ cluster = devm_kzalloc(dev, sizeof(*cluster), GFP_KERNEL);
+ if (!cluster)
+ return dev_err_probe(dev, -ENOMEM, "Unable to allocate scp cluster\n");
+
+ INIT_LIST_HEAD(&cluster->cores);
+ platform_set_drvdata(pdev, cluster);
+
+ ret = scp_cluster_init(pdev, &scp_regs);
+ if (ret)
+ return dev_err_probe(dev, ret, "Failed to initialize scp cluster\n");
+
+ ret = devm_add_action_or_reset(dev, scp_cluster_exit, pdev);
+ }
+
+ return ret;
}
static const struct mtk_scp_of_data mt8183_of_data = {
@@ -1061,19 +1188,25 @@ static const struct mtk_scp_of_data mt8195_of_data_c1 = {
.host_to_scp_int_bit = MT8195_CORE1_HOST_IPC_INT_BIT,
};
+static const struct mtk_scp_of_data *mt8195_of_data_cores[] = {
+ &mt8195_of_data,
+ &mt8195_of_data_c1,
+ NULL
+};
+
static const struct of_device_id mtk_scp_of_match[] = {
{ .compatible = "mediatek,mt8183-scp", .data = &mt8183_of_data },
{ .compatible = "mediatek,mt8186-scp", .data = &mt8186_of_data },
{ .compatible = "mediatek,mt8188-scp", .data = &mt8188_of_data },
{ .compatible = "mediatek,mt8192-scp", .data = &mt8192_of_data },
{ .compatible = "mediatek,mt8195-scp", .data = &mt8195_of_data },
+ { .compatible = "mediatek,mt8195-scp-dual", .data = &mt8195_of_data_cores },
{},
};
MODULE_DEVICE_TABLE(of, mtk_scp_of_match);
static struct platform_driver mtk_scp_driver = {
.probe = scp_probe,
- .remove = scp_remove,
I'm sorry, but this is unacceptable: you're removing any ability to remove this
device (read: to unload, if module, or to remove from sysfs, if builtin).
Please fix that.
Regards,
Angelo
.driver = {
.name = "mtk-scp",
.of_match_table = mtk_scp_of_match,