@@ -60,7 +60,8 @@
enum mtk_smi_type {
MTK_SMI_GEN1,
- MTK_SMI_GEN2
+ MTK_SMI_GEN2, /* gen2 smi common */
+ MTK_SMI_GEN2_SUB_COMM, /* gen2 smi sub common */
};
#define MTK_SMI_CLK_NR_MAX 4
@@ -93,13 +94,14 @@ struct mtk_smi {
void __iomem *smi_ao_base; /* only for gen1 */
void __iomem *base; /* only for gen2 */
};
+ struct device *smi_common_dev; /* for sub common */
const struct mtk_smi_common_plat *plat;
};
struct mtk_smi_larb { /* larb: local arbiter */
struct mtk_smi smi;
void __iomem *base;
- struct device *smi_common_dev;
+ struct device *smi_common_dev; /* common or sub-common dev */
const struct mtk_smi_larb_gen *larb_gen;
int larbid;
u32 *mmu;
@@ -206,6 +208,39 @@ mtk_smi_larb_unbind(struct device *dev, struct device *master, void *data)
/* Do nothing as the iommu is always enabled. */
}
+static int mtk_smi_device_link_common(struct device *dev, struct device **com_dev)
+{
+ struct platform_device *smi_com_pdev;
+ struct device_node *smi_com_node;
+ struct device *smi_com_dev;
+ struct device_link *link;
+
+ smi_com_node = of_parse_phandle(dev->of_node, "mediatek,smi", 0);
+ if (!smi_com_node)
+ return -EINVAL;
+
+ smi_com_pdev = of_find_device_by_node(smi_com_node);
+ of_node_put(smi_com_node);
+ if (smi_com_pdev) {
+ /* smi common is the supplier, Make sure it is ready before */
+ if (!platform_get_drvdata(smi_com_pdev))
+ return -EPROBE_DEFER;
+ smi_com_dev = &smi_com_pdev->dev;
+ link = device_link_add(dev, smi_com_dev,
+ DL_FLAG_PM_RUNTIME | DL_FLAG_STATELESS);
+ if (!link) {
+ dev_err(dev, "Unable to link smi-common dev\n");
+ return -ENODEV;
+ }
+ *com_dev = smi_com_dev;
+ } else {
+ dev_err(dev, "Failed to get the smi_common device\n");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
static const struct component_ops mtk_smi_larb_component_ops = {
.bind = mtk_smi_larb_bind,
.unbind = mtk_smi_larb_unbind,
@@ -267,9 +302,6 @@ static int mtk_smi_larb_probe(struct platform_device *pdev)
struct mtk_smi_larb *larb;
struct resource *res;
struct device *dev = &pdev->dev;
- struct device_node *smi_node;
- struct platform_device *smi_pdev;
- struct device_link *link;
int i, ret;
larb = devm_kzalloc(dev, sizeof(*larb), GFP_KERNEL);
@@ -291,27 +323,9 @@ static int mtk_smi_larb_probe(struct platform_device *pdev)
return ret;
larb->smi.dev = dev;
-
- smi_node = of_parse_phandle(dev->of_node, "mediatek,smi", 0);
- if (!smi_node)
- return -EINVAL;
-
- smi_pdev = of_find_device_by_node(smi_node);
- of_node_put(smi_node);
- if (smi_pdev) {
- if (!platform_get_drvdata(smi_pdev))
- return -EPROBE_DEFER;
- larb->smi_common_dev = &smi_pdev->dev;
- link = device_link_add(dev, larb->smi_common_dev,
- DL_FLAG_PM_RUNTIME | DL_FLAG_STATELESS);
- if (!link) {
- dev_err(dev, "Unable to link smi-common dev\n");
- return -ENODEV;
- }
- } else {
- dev_err(dev, "Failed to get the smi_common device\n");
- return -EINVAL;
- }
+ ret = mtk_smi_device_link_common(dev, &larb->smi_common_dev);
+ if (ret < 0)
+ return ret;
pm_runtime_enable(dev);
platform_set_drvdata(pdev, larb);
@@ -451,6 +465,14 @@ static int mtk_smi_common_probe(struct platform_device *pdev)
if (IS_ERR(common->base))
return PTR_ERR(common->base);
}
+
+ /* link its smi-common if this is smi-sub-common */
+ if (common->plat->type == MTK_SMI_GEN2_SUB_COMM) {
+ ret = mtk_smi_device_link_common(dev, &common->smi_common_dev);
+ if (ret < 0)
+ return ret;
+ }
+
pm_runtime_enable(dev);
platform_set_drvdata(pdev, common);
return 0;
@@ -458,6 +480,10 @@ static int mtk_smi_common_probe(struct platform_device *pdev)
static int mtk_smi_common_remove(struct platform_device *pdev)
{
+ struct mtk_smi *common = dev_get_drvdata(&pdev->dev);
+
+ if (common->plat->type == MTK_SMI_GEN2_SUB_COMM)
+ device_link_remove(&pdev->dev, common->smi_common_dev);
pm_runtime_disable(&pdev->dev);
return 0;
}
This patch adds smi-sub-common support. some larbs may connect with the smi-sub-common, then connect with smi-common. Before we create device link between smi-larb with smi-common, If we have sub-common, we should use device link the smi-larb and smi-sub-common, then use device link between the smi-sub-common with smi-common. This is for enabling clock/power automatically. Move the device link code to a new interface for reusing. there is no SW extra setting for smi-sub-common. Signed-off-by: Yong Wu <yong.wu@mediatek.com> --- drivers/memory/mtk-smi.c | 78 ++++++++++++++++++++++++++-------------- 1 file changed, 52 insertions(+), 26 deletions(-)