[PATCH v17 07/14] remoteproc: mediatek: Probe SCP cluster on single-core SCP

Tinghan Shen
2023-09-01T08:10:23Z

This is the 3rd preliminary step for probing multi-core SCP.
Rewrite the probing flow of single-core SCP to adapt with the 'cluster'
concept needed by the multi-core SCP. The SCP core object(s)
is maintained at the cluster list.

Signed-off-by: Tinghan Shen <tinghan.shen@mediatek.com>
---
drivers/remoteproc/mtk_common.h | 2 +
drivers/remoteproc/mtk_scp.c | 86 +++++++++++++++++++++++----------
2 files changed, 63 insertions(+), 25 deletions(-)

diff --git a/drivers/remoteproc/mtk_common.h b/drivers/remoteproc/mtk_common.h
index b04d71277c1f..1438159ae736 100644
--- a/drivers/remoteproc/mtk_common.h
+++ b/drivers/remoteproc/mtk_common.h
@@ -105,6 +105,7 @@ struct mtk_scp_of_cluster {
void __iomem *l1tcm_base;
size_t l1tcm_size;
phys_addr_t l1tcm_phys;
+ struct list_head mtk_scp_list;
};

struct mtk_scp {
@@ -132,6 +133,7 @@ struct mtk_scp {

struct rproc_subdev *rpmsg_subdev;

+ struct list_head elem;
struct mtk_scp_of_cluster *cluster;
};

diff --git a/drivers/remoteproc/mtk_scp.c b/drivers/remoteproc/mtk_scp.c
index 7a2ba1e1e95a..d67dcabdab9e 100644
--- a/drivers/remoteproc/mtk_scp.c
+++ b/drivers/remoteproc/mtk_scp.c
@@ -854,8 +854,8 @@ static void scp_remove_rpmsg_subdev(struct mtk_scp *scp)
}
}

-static int scp_rproc_init(struct platform_device *pdev,
- struct mtk_scp_of_cluster *scp_cluster)
+static struct mtk_scp *scp_rproc_init(struct platform_device *pdev,
+ struct mtk_scp_of_cluster *scp_cluster)
{
struct device *dev = &pdev->dev;
struct device_node *np = dev->of_node;
@@ -867,11 +867,13 @@ static int scp_rproc_init(struct platform_device *pdev,

ret = rproc_of_parse_firmware(dev, 0, &fw_name);
if (ret < 0 && ret != -EINVAL)
- return ret;
+ return ERR_PTR(ret);

rproc = devm_rproc_alloc(dev, np->name, &scp_ops, fw_name, sizeof(*scp));
- if (!rproc)
- return dev_err_probe(dev, -ENOMEM, "unable to allocate remoteproc\n");
+ if (!rproc) {
+ dev_err(dev, "unable to allocate remoteproc\n");
+ return ERR_PTR(-ENOMEM);
+ }

scp = rproc->priv;
scp->rproc = rproc;
@@ -882,20 +884,21 @@ static int scp_rproc_init(struct platform_device *pdev,

res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "sram");
scp->sram_base = devm_ioremap_resource(dev, res);
- if (IS_ERR(scp->sram_base))
- return dev_err_probe(dev, PTR_ERR(scp->sram_base),
- "Failed to parse and map sram memory\n");
+ if (IS_ERR(scp->sram_base)) {
+ dev_err(dev, "Failed to parse and map sram memory\n");
+ return ERR_CAST(scp->sram_base);
+ }

scp->sram_size = resource_size(res);
scp->sram_phys = res->start;

ret = scp->data->scp_clk_get(scp);
if (ret)
- return ret;
+ return ERR_PTR(ret);

ret = scp_map_memory_region(scp);
if (ret)
- return ret;
+ return ERR_PTR(ret);

mutex_init(&scp->send_lock);
for (i = 0; i < SCP_IPI_MAX; i++)
@@ -922,11 +925,7 @@ static int scp_rproc_init(struct platform_device *pdev,
goto remove_subdev;
}

- ret = rproc_add(rproc);
- if (ret)
- goto remove_subdev;
-
- return 0;
+ return scp;

remove_subdev:
scp_remove_rpmsg_subdev(scp);
@@ -937,7 +936,43 @@ static int scp_rproc_init(struct platform_device *pdev,
mutex_destroy(&scp->ipi_desc[i].lock);
mutex_destroy(&scp->send_lock);

- return ret;
+ return ERR_PTR(ret);
+}
+
+static void scp_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 int scp_cluster_init(struct platform_device *pdev,
+ struct mtk_scp_of_cluster *scp_cluster)
+{
+ struct device *dev = &pdev->dev;
+ struct list_head *scp_list = &scp_cluster->mtk_scp_list;
+ struct mtk_scp *scp;
+ int ret;
+
+ scp = scp_rproc_init(pdev, scp_cluster);
+ if (IS_ERR(scp))
+ return PTR_ERR(scp);
+
+ ret = rproc_add(scp->rproc);
+ if (ret) {
+ dev_err(dev, "Failed to add rproc\n");
+ scp_free(scp);
+ return ret;
+ }
+
+ list_add_tail(&scp->elem, scp_list);
+
+ return 0;
}

static int scp_probe(struct platform_device *pdev)
@@ -970,7 +1005,9 @@ static int scp_probe(struct platform_device *pdev)
scp_cluster->l1tcm_phys = res->start;
}

- ret = scp_rproc_init(pdev, scp_cluster);
+ INIT_LIST_HEAD(&scp_cluster->mtk_scp_list);
+
+ ret = scp_cluster_init(pdev, scp_cluster);
if (ret)
return ret;

@@ -980,15 +1017,14 @@ static int scp_probe(struct platform_device *pdev)
static void scp_remove(struct platform_device *pdev)
{
struct mtk_scp *scp = platform_get_drvdata(pdev);
- int i;
+ struct mtk_scp_of_cluster *scp_cluster = scp->cluster;
+ struct mtk_scp *temp;

- 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);
+ list_for_each_entry_safe_reverse(scp, temp, &scp_cluster->mtk_scp_list, elem) {
+ list_del(&scp->elem);
+ rproc_del(scp->rproc);
+ scp_free(scp);
+ }
}

static const struct mtk_scp_of_data mt8183_of_data = {
--
2.18.0