[PATCH v4 00/12] Add support for MT8195 SCP 2nd core

[PATCH v4 00/12] Add support for MT8195 SCP 2nd core

[Tinghan Shen]

The mediatek remoteproc driver currently only allows bringing up a 
single core SCP, e.g. MT8183. It also only bringing up the 1st 
core in SoCs with a dual-core SCP, e.g. MT8195. This series support 
to bring-up the 2nd core of the dual-core SCP.

v3 -> v4:
1. change the representation of dual-core SCP in dts file and update SCP yaml
2. rewrite SCP driver to reflect the change of dts node
3. drop 'remove redundant call of rproc_boot for SCP' in v3 for further investigation

v2 -> v3:
1. change the representation of dual-core SCP in dts file and update SCP yaml
2. rewrite SCP driver to reflect the change of dts node
3. add SCP core 1 node to mt8195.dtsi
4. remove redundant call of rproc_boot for SCP
5. refine IPI error message

v1 -> v2:
1. update dt-binding property description
2. remove kconfig for scp dual driver
3. merge mtk_scp_dual.c and mtk_scp_subdev.c to mtk_scp.c

Tinghan Shen (12):
  dt-bindings: remoteproc: mediatek: Improve the rpmsg subnode
    definition
  arm64: dts: mediatek: mt8183-kukui: Update the node name of SCP rpmsg
    subnode
  dt-bindings: remoteproc: mediatek: Support MT8195 dual-core SCP
  remoteproc: mediatek: Add SCP core 1 register definitions
  remoteproc: mediatek: Add MT8195 SCP core 1 operations
  remoteproc: mediatek: Extract remoteproc initialization flow
  remoteproc: mediatek: Probe multi-core SCP
  remoteproc: mediatek: Control SCP core 1 by rproc subdevice
  remoteproc: mediatek: Setup MT8195 SCP core 1 SRAM offset
  remoteproc: mediatek: Handle MT8195 SCP core 1 watchdog timeout
  remoteproc: mediatek: Refine ipi handler error message
  arm64: dts: mediatek: mt8195: Add SCP 2nd core

 .../bindings/remoteproc/mtk,scp.yaml          | 176 +++++++-
 .../arm64/boot/dts/mediatek/mt8183-kukui.dtsi |   2 +-
 .../boot/dts/mediatek/mt8195-cherry.dtsi      |   4 +
 arch/arm64/boot/dts/mediatek/mt8195.dtsi      |  30 +-
 drivers/remoteproc/mtk_common.h               |  47 +++
 drivers/remoteproc/mtk_scp.c                  | 379 ++++++++++++++++--
 6 files changed, 580 insertions(+), 58 deletions(-)

-- 
2.18.0

[PATCH v4 01/12] dt-bindings: remoteproc: mediatek: Improve the rpmsg subnode definition

[Tinghan Shen]

Improve the definition of the rpmsg subnode by
assigning a distinct node name and adding the
definition source of node properties.

Signed-off-by: Tinghan Shen <tinghan.shen@mediatek.com>
---
 .../bindings/remoteproc/mtk,scp.yaml          | 31 +++++++++----------
 1 file changed, 15 insertions(+), 16 deletions(-)

diff --git a/Documentation/devicetree/bindings/remoteproc/mtk,scp.yaml b/Documentation/devicetree/bindings/remoteproc/mtk,scp.yaml
index 895415772d1d..271081df0e46 100644
--- a/Documentation/devicetree/bindings/remoteproc/mtk,scp.yaml
+++ b/Documentation/devicetree/bindings/remoteproc/mtk,scp.yaml
@@ -58,6 +58,18 @@ properties:
   memory-region:
     maxItems: 1
 
+  cros-ec-rpmsg:
+    $ref: /schemas/mfd/google,cros-ec.yaml
+    description:
+      This subnode represents the rpmsg device. The properties
+      of this node are defined by the individual bindings for
+      the rpmsg devices.
+
+    required:
+      - mediatek,rpmsg-name
+
+    unevaluatedProperties: false
+
 required:
   - compatible
   - reg
@@ -89,21 +101,7 @@ allOf:
         reg-names:
           maxItems: 2
 
-additionalProperties:
-  type: object
-  description:
-    Subnodes of the SCP represent rpmsg devices. The names of the devices
-    are not important. The properties of these nodes are defined by the
-    individual bindings for the rpmsg devices.
-  properties:
-    mediatek,rpmsg-name:
-      $ref: /schemas/types.yaml#/definitions/string-array
-      description:
-        Contains the name for the rpmsg device. Used to match
-        the subnode to rpmsg device announced by SCP.
-
-  required:
-    - mediatek,rpmsg-name
+additionalProperties: false
 
 examples:
   - |
@@ -118,7 +116,8 @@ examples:
         clocks = <&infracfg CLK_INFRA_SCPSYS>;
         clock-names = "main";
 
-        cros_ec {
+        cros-ec-rpmsg {
+            compatible = "google,cros-ec-rpmsg";
             mediatek,rpmsg-name = "cros-ec-rpmsg";
         };
     };
-- 
2.18.0

[PATCH v4 02/12] arm64: dts: mediatek: mt8183-kukui: Update the node name of SCP rpmsg subnode

[Tinghan Shen]

Align the node name with the definition in SCP bindings.

Signed-off-by: Tinghan Shen <tinghan.shen@mediatek.com>
---
 arch/arm64/boot/dts/mediatek/mt8183-kukui.dtsi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/mediatek/mt8183-kukui.dtsi b/arch/arm64/boot/dts/mediatek/mt8183-kukui.dtsi
index fbe14b13051a..a259eb043de5 100644
--- a/arch/arm64/boot/dts/mediatek/mt8183-kukui.dtsi
+++ b/arch/arm64/boot/dts/mediatek/mt8183-kukui.dtsi
@@ -810,7 +810,7 @@
 	pinctrl-names = "default";
 	pinctrl-0 = <&scp_pins>;
 
-	cros_ec {
+	cros-ec-rpmsg {
 		compatible = "google,cros-ec-rpmsg";
 		mediatek,rpmsg-name = "cros-ec-rpmsg";
 	};
-- 
2.18.0

[PATCH v4 03/12] dt-bindings: remoteproc: mediatek: Support MT8195 dual-core SCP

[Tinghan Shen]

Extend the SCP binding to describe the MT8195 dual-core SCP.

Under different applications, the MT8195 SCP can be used as single-core
or dual-core. This change keeps the single-core definition and
adds new definitions for dual-core use case.

Signed-off-by: Tinghan Shen <tinghan.shen@mediatek.com>
---
 .../bindings/remoteproc/mtk,scp.yaml          | 145 +++++++++++++++++-
 1 file changed, 141 insertions(+), 4 deletions(-)

diff --git a/Documentation/devicetree/bindings/remoteproc/mtk,scp.yaml b/Documentation/devicetree/bindings/remoteproc/mtk,scp.yaml
index 271081df0e46..09102dda4942 100644
--- a/Documentation/devicetree/bindings/remoteproc/mtk,scp.yaml
+++ b/Documentation/devicetree/bindings/remoteproc/mtk,scp.yaml
@@ -21,6 +21,7 @@ properties:
       - mediatek,mt8188-scp
       - mediatek,mt8192-scp
       - mediatek,mt8195-scp
+      - mediatek,mt8195-scp-dual
 
   reg:
     description:
@@ -31,10 +32,7 @@ properties:
 
   reg-names:
     minItems: 2
-    items:
-      - const: sram
-      - const: cfg
-      - const: l1tcm
+    maxItems: 3
 
   clocks:
     description:
@@ -70,6 +68,81 @@ properties:
 
     unevaluatedProperties: false
 
+  '#address-cells':
+    const: 1
+
+  '#size-cells':
+    const: 1
+
+  ranges:
+    description:
+      Standard ranges definition providing address translations for
+      local SCP SRAM address spaces to bus addresses.
+
+patternProperties:
+  "^scp@[a-f0-9]+$":
+    type: object
+    description:
+      The MediaTek SCP integrated to SoC might be a multi-core version.
+      The other cores are represented as child nodes of the boot core.
+      There are some integration differences for the IP like the usage of
+      address translator for translating SoC bus addresses into address space
+      for the processor.
+
+      Each SCP core has own cache memory. The SRAM and L1TCM are shared by
+      cores. The power of cache, SRAM and L1TCM power should be enabled
+      before booting SCP cores. The size of cache, SRAM, and L1TCM are varied
+      on differnt SoCs.
+
+      The SCP cores do not use an MMU, but has a set of registers to
+      control the translations between 32-bit CPU addresses into system bus
+      addresses. Cache and memory access settings are provided through a
+      Memory Protection Unit (MPU), programmable only from the SCP.
+
+    properties:
+      compatible:
+        enum:
+          - mediatek,scp-core
+
+      reg:
+        description: The base address and size of SRAM.
+        maxItems: 1
+
+      reg-names:
+        const: sram
+
+      interrupts:
+        maxItems: 1
+
+      firmware-name:
+        $ref: /schemas/types.yaml#/definitions/string
+        description:
+          If present, name (or relative path) of the file within the
+          firmware search path containing the firmware image used when
+          initializing sub cores of multi-core SCP.
+
+      memory-region:
+        maxItems: 1
+
+      cros-ec-rpmsg:
+        $ref: /schemas/mfd/google,cros-ec.yaml
+        description:
+          This subnode represents the rpmsg device. The properties
+          of this node are defined by the individual bindings for
+          the rpmsg devices.
+
+        required:
+          - mediatek,rpmsg-name
+
+        unevaluatedProperties: false
+
+    required:
+      - compatible
+      - reg
+      - reg-names
+
+    additionalProperties: false
+
 required:
   - compatible
   - reg
@@ -99,7 +172,37 @@ allOf:
         reg:
           maxItems: 2
         reg-names:
+          items:
+            - const: sram
+            - const: cfg
+  - if:
+      properties:
+        compatible:
+          enum:
+            - mediatek,mt8192-scp
+            - mediatek,mt8195-scp
+    then:
+      properties:
+        reg:
+          maxItems: 3
+        reg-names:
+          items:
+            - const: sram
+            - const: cfg
+            - const: l1tcm
+  - if:
+      properties:
+        compatible:
+          enum:
+            - mediatek,mt8195-scp-dual
+    then:
+      properties:
+        reg:
           maxItems: 2
+        reg-names:
+          items:
+            - const: cfg
+            - const: l1tcm
 
 additionalProperties: false
 
@@ -121,3 +224,37 @@ examples:
             mediatek,rpmsg-name = "cros-ec-rpmsg";
         };
     };
+
+  - |
+    scp@10500000 {
+        compatible = "mediatek,mt8195-scp-dual";
+        reg = <0x10720000 0xe0000>,
+              <0x10700000 0x8000>;
+        reg-names = "cfg", "l1tcm";
+
+        #address-cells = <1>;
+        #size-cells = <1>;
+        ranges = <0 0x10500000 0x100000>;
+
+        scp@0 {
+            compatible = "mediatek,scp-core";
+            reg = <0x0 0xa0000>;
+            reg-names = "sram";
+
+            cros-ec-rpmsg {
+                compatible = "google,cros-ec-rpmsg";
+                mediatek,rpmsg-name = "cros-ec-rpmsg";
+            };
+        };
+
+        scp@a0000 {
+            compatible = "mediatek,scp-core";
+            reg = <0xa0000 0x20000>;
+            reg-names = "sram";
+
+            cros-ec-rpmsg {
+                compatible = "google,cros-ec-rpmsg";
+                mediatek,rpmsg-name = "cros-ec-rpmsg";
+            };
+        };
+    };
-- 
2.18.0

[PATCH v4 04/12] remoteproc: mediatek: Add SCP core 1 register definitions

[Tinghan Shen]

Add MT8195 SCP core 1 related register definitions.

Signed-off-by: Tinghan Shen <tinghan.shen@mediatek.com>
Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
---
 drivers/remoteproc/mtk_common.h | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/drivers/remoteproc/mtk_common.h b/drivers/remoteproc/mtk_common.h
index ea6fa1100a00..3778894c96f3 100644
--- a/drivers/remoteproc/mtk_common.h
+++ b/drivers/remoteproc/mtk_common.h
@@ -47,6 +47,7 @@
 #define MT8192_SCP2SPM_IPC_CLR		0x4094
 #define MT8192_GIPC_IN_SET		0x4098
 #define MT8192_HOST_IPC_INT_BIT		BIT(0)
+#define MT8195_CORE1_HOST_IPC_INT_BIT	BIT(4)
 
 #define MT8192_CORE0_SW_RSTN_CLR	0x10000
 #define MT8192_CORE0_SW_RSTN_SET	0x10004
@@ -56,6 +57,26 @@
 
 #define MT8195_L1TCM_SRAM_PDN_RESERVED_RSI_BITS		GENMASK(7, 4)
 
+#define MT8195_CPU1_SRAM_PD			0x1084
+#define MT8195_SSHUB2APMCU_IPC_SET		0x4088
+#define MT8195_SSHUB2APMCU_IPC_CLR		0x408C
+#define MT8195_CORE1_SW_RSTN_CLR		0x20000
+#define MT8195_CORE1_SW_RSTN_SET		0x20004
+#define MT8195_CORE1_MEM_ATT_PREDEF		0x20008
+#define MT8195_CORE1_WDT_IRQ			0x20030
+#define MT8195_CORE1_WDT_CFG			0x20034
+
+#define MT8195_SEC_CTRL				0x85000
+#define MT8195_CORE_OFFSET_ENABLE_D		BIT(13)
+#define MT8195_CORE_OFFSET_ENABLE_I		BIT(12)
+#define MT8195_L2TCM_OFFSET_RANGE_0_LOW		0x850b0
+#define MT8195_L2TCM_OFFSET_RANGE_0_HIGH	0x850b4
+#define MT8195_L2TCM_OFFSET			0x850d0
+#define SCP_SRAM_REMAP_LOW			0
+#define SCP_SRAM_REMAP_HIGH			1
+#define SCP_SRAM_REMAP_OFFSET			2
+#define SCP_SRAM_REMAP_SIZE			3
+
 #define SCP_FW_VER_LEN			32
 #define SCP_SHARE_BUFFER_SIZE		288
 
-- 
2.18.0

[PATCH v4 05/12] remoteproc: mediatek: Add MT8195 SCP core 1 operations

[Tinghan Shen]

The SCP rproc driver has a set of chip dependent callbacks for
boot sequence and IRQ handling. Implement these callbacks for MT8195
SCP core 1.

Signed-off-by: Tinghan Shen <tinghan.shen@mediatek.com>
---
 drivers/remoteproc/mtk_scp.c | 56 ++++++++++++++++++++++++++++++++++++
 1 file changed, 56 insertions(+)

diff --git a/drivers/remoteproc/mtk_scp.c b/drivers/remoteproc/mtk_scp.c
index d421a2ccaa1e..b92274067522 100644
--- a/drivers/remoteproc/mtk_scp.c
+++ b/drivers/remoteproc/mtk_scp.c
@@ -176,6 +176,16 @@ static void mt8192_scp_reset_deassert(struct mtk_scp *scp)
 	writel(1, scp->reg_base + MT8192_CORE0_SW_RSTN_CLR);
 }
 
+static void mt8195_scp_c1_reset_assert(struct mtk_scp *scp)
+{
+	writel(1, scp->reg_base + MT8195_CORE1_SW_RSTN_SET);
+}
+
+static void mt8195_scp_c1_reset_deassert(struct mtk_scp *scp)
+{
+	writel(1, scp->reg_base + MT8195_CORE1_SW_RSTN_CLR);
+}
+
 static void mt8183_scp_irq_handler(struct mtk_scp *scp)
 {
 	u32 scp_to_host;
@@ -212,6 +222,18 @@ static void mt8192_scp_irq_handler(struct mtk_scp *scp)
 	}
 }
 
+static void mt8195_scp_c1_irq_handler(struct mtk_scp *scp)
+{
+	u32 scp_to_host;
+
+	scp_to_host = readl(scp->reg_base + MT8195_SSHUB2APMCU_IPC_SET);
+
+	if (scp_to_host & MT8192_SCP_IPC_INT_BIT)
+		scp_ipi_handler(scp);
+
+	writel(scp_to_host, scp->reg_base + MT8195_SSHUB2APMCU_IPC_CLR);
+}
+
 static irqreturn_t scp_irq_handler(int irq, void *priv)
 {
 	struct mtk_scp *scp = priv;
@@ -453,6 +475,19 @@ static int mt8195_scp_before_load(struct mtk_scp *scp)
 	return 0;
 }
 
+static int mt8195_scp_c1_before_load(struct mtk_scp *scp)
+{
+	scp_sram_power_on(scp->reg_base + MT8195_CPU1_SRAM_PD, 0);
+
+	/* hold SCP in reset while loading FW. */
+	scp->data->scp_reset_assert(scp);
+
+	/* enable MPU for all memory regions */
+	writel(0xff, scp->reg_base + MT8195_CORE1_MEM_ATT_PREDEF);
+
+	return 0;
+}
+
 static int scp_load(struct rproc *rproc, const struct firmware *fw)
 {
 	struct mtk_scp *scp = rproc->priv;
@@ -625,6 +660,15 @@ static void mt8195_scp_stop(struct mtk_scp *scp)
 	writel(0, scp->reg_base + MT8192_CORE0_WDT_CFG);
 }
 
+static void mt8195_scp_c1_stop(struct mtk_scp *scp)
+{
+	/* Power off CPU SRAM */
+	scp_sram_power_off(scp->reg_base + MT8195_CPU1_SRAM_PD, 0);
+
+	/* Disable SCP watchdog */
+	writel(0, scp->reg_base + MT8195_CORE1_WDT_CFG);
+}
+
 static int scp_stop(struct rproc *rproc)
 {
 	struct mtk_scp *scp = (struct mtk_scp *)rproc->priv;
@@ -990,6 +1034,18 @@ static const struct mtk_scp_of_data mt8195_of_data = {
 	.host_to_scp_int_bit = MT8192_HOST_IPC_INT_BIT,
 };
 
+static const struct mtk_scp_of_data mt8195_of_data_c1 = {
+	.scp_clk_get = mt8195_scp_clk_get,
+	.scp_before_load = mt8195_scp_c1_before_load,
+	.scp_irq_handler = mt8195_scp_c1_irq_handler,
+	.scp_reset_assert = mt8195_scp_c1_reset_assert,
+	.scp_reset_deassert = mt8195_scp_c1_reset_deassert,
+	.scp_stop = mt8195_scp_c1_stop,
+	.scp_da_to_va = mt8192_scp_da_to_va,
+	.host_to_scp_reg = MT8192_GIPC_IN_SET,
+	.host_to_scp_int_bit = MT8195_CORE1_HOST_IPC_INT_BIT,
+};
+
 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 },
-- 
2.18.0

[PATCH v4 06/12] remoteproc: mediatek: Extract remoteproc initialization flow

[Tinghan Shen]

This is the preparation for probing multi-core SCP. The remoteproc
initialization flow is similar on cores and is reuesd to avoid
redundant code.

The registers of config and l1tcm are shared for multi-core
SCP. Reuse the mapped addresses for all cores.

Signed-off-by: Tinghan Shen <tinghan.shen@mediatek.com>
---
 drivers/remoteproc/mtk_common.h |  7 +++++
 drivers/remoteproc/mtk_scp.c    | 55 +++++++++++++++++++++------------
 2 files changed, 42 insertions(+), 20 deletions(-)

diff --git a/drivers/remoteproc/mtk_common.h b/drivers/remoteproc/mtk_common.h
index 3778894c96f3..20c1a90be77d 100644
--- a/drivers/remoteproc/mtk_common.h
+++ b/drivers/remoteproc/mtk_common.h
@@ -112,6 +112,13 @@ struct mtk_scp_of_data {
 	size_t ipi_buf_offset;
 };
 
+struct mtk_scp_of_regs {
+	void __iomem *reg_base;
+	void __iomem *l1tcm_base;
+	size_t l1tcm_size;
+	phys_addr_t l1tcm_phys;
+};
+
 struct mtk_scp {
 	struct device *dev;
 	struct rproc *rproc;
diff --git a/drivers/remoteproc/mtk_scp.c b/drivers/remoteproc/mtk_scp.c
index b92274067522..feebcadd56cd 100644
--- a/drivers/remoteproc/mtk_scp.c
+++ b/drivers/remoteproc/mtk_scp.c
@@ -854,7 +854,8 @@ static void scp_remove_rpmsg_subdev(struct mtk_scp *scp)
 	}
 }
 
-static int scp_probe(struct platform_device *pdev)
+static int scp_rproc_init(struct platform_device *pdev,
+			  struct mtk_scp_of_regs *of_regs)
 {
 	struct device *dev = &pdev->dev;
 	struct device_node *np = dev->of_node;
@@ -878,6 +879,11 @@ static int scp_probe(struct platform_device *pdev)
 	scp->data = of_device_get_match_data(dev);
 	platform_set_drvdata(pdev, scp);
 
+	scp->reg_base = of_regs->reg_base;
+	scp->l1tcm_base = of_regs->l1tcm_base;
+	scp->l1tcm_size = of_regs->l1tcm_size;
+	scp->l1tcm_phys = of_regs->l1tcm_phys;
+
 	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "sram");
 	scp->sram_base = devm_ioremap_resource(dev, res);
 	if (IS_ERR(scp->sram_base))
@@ -887,24 +893,6 @@ static int scp_probe(struct platform_device *pdev)
 	scp->sram_size = resource_size(res);
 	scp->sram_phys = res->start;
 
-	/* l1tcm is an optional memory region */
-	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "l1tcm");
-	scp->l1tcm_base = devm_ioremap_resource(dev, res);
-	if (IS_ERR(scp->l1tcm_base)) {
-		ret = PTR_ERR(scp->l1tcm_base);
-		if (ret != -EINVAL) {
-			return dev_err_probe(dev, ret, "Failed to map l1tcm memory\n");
-		}
-	} else {
-		scp->l1tcm_size = resource_size(res);
-		scp->l1tcm_phys = res->start;
-	}
-
-	scp->reg_base = devm_platform_ioremap_resource_byname(pdev, "cfg");
-	if (IS_ERR(scp->reg_base))
-		return dev_err_probe(dev, PTR_ERR(scp->reg_base),
-				     "Failed to parse and map cfg memory\n");
-
 	ret = scp->data->scp_clk_get(scp);
 	if (ret)
 		return ret;
@@ -932,7 +920,6 @@ static int scp_probe(struct platform_device *pdev)
 	ret = devm_request_threaded_irq(dev, platform_get_irq(pdev, 0), NULL,
 					scp_irq_handler, IRQF_ONESHOT,
 					pdev->name, scp);
-
 	if (ret) {
 		dev_err(dev, "failed to request irq\n");
 		goto remove_subdev;
@@ -956,6 +943,34 @@ static int scp_probe(struct platform_device *pdev)
 	return ret;
 }
 
+static int scp_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct resource *res;
+	struct mtk_scp_of_regs scp_regs;
+	int ret;
+
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "cfg");
+	scp_regs.reg_base = devm_ioremap_resource(dev, res);
+	if (IS_ERR(scp_regs.reg_base))
+		return dev_err_probe(dev, PTR_ERR(scp_regs.reg_base),
+				     "Failed to parse and map cfg memory\n");
+
+	/* l1tcm is an optional memory region */
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "l1tcm");
+	scp_regs.l1tcm_base = devm_ioremap_resource(dev, res);
+	if (IS_ERR(scp_regs.l1tcm_base)) {
+		ret = PTR_ERR(scp_regs.l1tcm_base);
+		if (ret != -EINVAL)
+			return dev_err_probe(dev, ret, "Failed to map l1tcm memory\n");
+	} else {
+		scp_regs.l1tcm_size = resource_size(res);
+		scp_regs.l1tcm_phys = res->start;
+	}
+
+	return scp_rproc_init(pdev, of_device_get_match_data(dev), &scp_regs);
+}
+
 static int scp_remove(struct platform_device *pdev)
 {
 	struct mtk_scp *scp = platform_get_drvdata(pdev);
-- 
2.18.0

[PATCH v4 07/12] remoteproc: mediatek: Probe multi-core SCP

[Tinghan Shen]

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@mediatek.com>
---
 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,
 	.driver = {
 		.name = "mtk-scp",
 		.of_match_table = mtk_scp_of_match,
-- 
2.18.0

[PATCH v4 08/12] remoteproc: mediatek: Control SCP core 1 by rproc subdevice

[Tinghan Shen]

Register SCP core 1 as a subdevice of core 0 for the boot sequence
and watchdog timeout handling. The core 1 has to boot after core 0
because the SCP clock and SRAM power is controlled by SCP core 0.
As for watchdog timeout handling, the remoteproc framework helps to
stop/start subdevices automatically when SCP driver receives watchdog
timeout event.

Signed-off-by: Tinghan Shen <tinghan.shen@mediatek.com>
---
 drivers/remoteproc/mtk_common.h |  8 ++++
 drivers/remoteproc/mtk_scp.c    | 66 +++++++++++++++++++++++++++++++++
 2 files changed, 74 insertions(+)

diff --git a/drivers/remoteproc/mtk_common.h b/drivers/remoteproc/mtk_common.h
index 0b2c4bbb55f0..e4ef97f2d3a1 100644
--- a/drivers/remoteproc/mtk_common.h
+++ b/drivers/remoteproc/mtk_common.h
@@ -123,6 +123,13 @@ struct mtk_scp_cluster {
 	struct list_head cores;
 };
 
+struct mtk_scp_core_subdev {
+	struct rproc_subdev subdev;
+	struct mtk_scp *scp;
+};
+
+#define to_core_subdev(d) container_of(d, struct mtk_scp_core_subdev, subdev)
+
 struct mtk_scp {
 	struct device *dev;
 	struct rproc *rproc;
@@ -154,6 +161,7 @@ struct mtk_scp {
 
 	struct list_head elem;
 	struct mtk_scp_cluster *cluster;
+	struct mtk_scp_core_subdev *core_subdev;
 };
 
 /**
diff --git a/drivers/remoteproc/mtk_scp.c b/drivers/remoteproc/mtk_scp.c
index a25141c6c4cb..e7d4f279c55e 100644
--- a/drivers/remoteproc/mtk_scp.c
+++ b/drivers/remoteproc/mtk_scp.c
@@ -854,6 +854,60 @@ static void scp_remove_rpmsg_subdev(struct mtk_scp *scp)
 	}
 }
 
+static int scp_core_subdev_start(struct rproc_subdev *subdev)
+{
+	struct mtk_scp_core_subdev *core_subdev = to_core_subdev(subdev);
+	struct mtk_scp *scp = core_subdev->scp;
+
+	rproc_boot(scp->rproc);
+
+	return 0;
+}
+
+static void scp_core_subdev_stop(struct rproc_subdev *subdev, bool crashed)
+{
+	struct mtk_scp_core_subdev *core_subdev = to_core_subdev(subdev);
+	struct mtk_scp *scp = core_subdev->scp;
+
+	rproc_shutdown(scp->rproc);
+}
+
+static int scp_core_subdev_register(struct mtk_scp *scp)
+{
+	struct device *dev = scp->dev;
+	struct mtk_scp_core_subdev *core_subdev;
+	struct mtk_scp *scp_c0;
+
+	scp_c0 = list_first_entry(&scp->cluster->cores, struct mtk_scp, elem);
+	if (!scp_c0)
+		return -ENODATA;
+
+	core_subdev = devm_kzalloc(dev, sizeof(*core_subdev), GFP_KERNEL);
+	if (!core_subdev)
+		return -ENOMEM;
+
+	core_subdev->scp = scp;
+	core_subdev->subdev.start = scp_core_subdev_start;
+	core_subdev->subdev.stop = scp_core_subdev_stop;
+
+	scp->core_subdev = core_subdev;
+	rproc_add_subdev(scp_c0->rproc, &scp->core_subdev->subdev);
+
+	return 0;
+}
+
+static void scp_core_subdev_unregister(struct mtk_scp *scp)
+{
+	struct mtk_scp *scp_c0;
+
+	if (scp->core_subdev) {
+		scp_c0 = list_first_entry(&scp->cluster->cores, struct mtk_scp, elem);
+		rproc_remove_subdev(scp_c0->rproc, &scp->core_subdev->subdev);
+		devm_kfree(scp->dev, scp->core_subdev);
+		scp->core_subdev = NULL;
+	}
+}
+
 static int scp_rproc_init(struct platform_device *pdev,
 			  struct mtk_scp_of_regs *of_regs,
 			  const struct mtk_scp_of_data *of_data,
@@ -954,6 +1008,7 @@ static void scp_rproc_free(struct mtk_scp *scp)
 {
 	int i;
 
+	scp_core_subdev_unregister(scp);
 	scp_remove_rpmsg_subdev(scp);
 	scp_ipi_unregister(scp, SCP_IPI_INIT);
 	scp_unmap_memory_region(scp);
@@ -1018,6 +1073,17 @@ static int scp_cluster_init(struct platform_device *pdev,
 	}
 
 	list_for_each_entry_safe_reverse(scp, temp, &cluster->cores, elem) {
+		if (!list_is_first(&scp->elem, &scp->cluster->cores)) {
+			ret = scp_core_subdev_register(scp);
+			if (ret) {
+				dev_err_probe(scp->dev, ret, "Failed to register as subdev\n");
+				goto add_fail;
+			}
+
+			/* sub cores are booted as subdevices of core 0 */
+			scp->rproc->auto_boot = false;
+		}
+
 		ret = rproc_add(scp->rproc);
 		if (ret)
 			goto add_fail;
-- 
2.18.0

[PATCH v4 09/12] remoteproc: mediatek: Setup MT8195 SCP core 1 SRAM offset

[Tinghan Shen]

Because MT8195 SCP core 0 and core 1 both boot from head of SRAM and
have the same viewpoint of SRAM, SCP has a "core 1 SRAM offset"
configuration to control the access destination of SCP core 1 to boot
core 1 from different SRAM location.

The "core 1 SRAM offset" configuration is composed by a range
and an offset. It works like a simple memory mapped mechanism.
When SCP core 1 accesses a SRAM address located in the range,
the SCP bus adds the configured offset to the address to
shift the physical destination address on SCP SRAM. This shifting is
transparent to the software running on SCP core 1.

Signed-off-by: Tinghan Shen <tinghan.shen@mediatek.com>
---
 drivers/remoteproc/mtk_scp.c | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/drivers/remoteproc/mtk_scp.c b/drivers/remoteproc/mtk_scp.c
index e7d4f279c55e..cfcb719ba50b 100644
--- a/drivers/remoteproc/mtk_scp.c
+++ b/drivers/remoteproc/mtk_scp.c
@@ -477,6 +477,9 @@ static int mt8195_scp_before_load(struct mtk_scp *scp)
 
 static int mt8195_scp_c1_before_load(struct mtk_scp *scp)
 {
+	u32 sec_ctrl;
+	struct mtk_scp *scp_c0;
+
 	scp_sram_power_on(scp->reg_base + MT8195_CPU1_SRAM_PD, 0);
 
 	/* hold SCP in reset while loading FW. */
@@ -485,6 +488,30 @@ static int mt8195_scp_c1_before_load(struct mtk_scp *scp)
 	/* enable MPU for all memory regions */
 	writel(0xff, scp->reg_base + MT8195_CORE1_MEM_ATT_PREDEF);
 
+	/*
+	 * The L2TCM_OFFSET_RANGE and L2TCM_OFFSET shift the destination address
+	 * on SRAM when SCP core 1 accesses SRAM.
+	 *
+	 * This configuration solves booting the SCP core 0 and core 1 from
+	 * different SRAM address because core 0 and core 1 both boot from
+	 * the head of SRAM by default. this must be configured before boot SCP core 1.
+	 *
+	 * The value of L2TCM_OFFSET_RANGE is from the viewpoint of SCP core 1.
+	 * When SCP core 1 issues address within the range (L2TCM_OFFSET_RANGE),
+	 * the address will be added with a fixed offset (L2TCM_OFFSET) on the bus.
+	 * The shift action is tranparent to software.
+	 */
+	writel(0, scp->reg_base + MT8195_L2TCM_OFFSET_RANGE_0_LOW);
+	writel(scp->sram_size, scp->reg_base + MT8195_L2TCM_OFFSET_RANGE_0_HIGH);
+
+	scp_c0 = list_first_entry(&scp->cluster->cores, struct mtk_scp, elem);
+	writel(scp->sram_phys - scp_c0->sram_phys, scp->reg_base + MT8195_L2TCM_OFFSET);
+
+	/* enable SRAM offset when fetching instruction and data */
+	sec_ctrl = readl(scp->reg_base + MT8195_SEC_CTRL);
+	sec_ctrl |= MT8195_CORE_OFFSET_ENABLE_I | MT8195_CORE_OFFSET_ENABLE_D;
+	writel(sec_ctrl, scp->reg_base + MT8195_SEC_CTRL);
+
 	return 0;
 }
 
-- 
2.18.0

[PATCH v4 10/12] remoteproc: mediatek: Handle MT8195 SCP core 1 watchdog timeout

[Tinghan Shen]

The MT8195 SCP core 1 watchdog timeout needs to be handled in the
SCP core 0 IRQ handler because the MT8195 SCP core 1 watchdog timeout
IRQ is wired on the same IRQ entry for core 0 watchdog timeout.
MT8195 SCP has a watchdog status register to identify the watchdog
timeout source when IRQ triggered.

Signed-off-by: Tinghan Shen <tinghan.shen@mediatek.com>
---
 drivers/remoteproc/mtk_common.h |  4 ++++
 drivers/remoteproc/mtk_scp.c    | 24 +++++++++++++++++++++++-
 2 files changed, 27 insertions(+), 1 deletion(-)

diff --git a/drivers/remoteproc/mtk_common.h b/drivers/remoteproc/mtk_common.h
index e4ef97f2d3a1..ca2395b98d27 100644
--- a/drivers/remoteproc/mtk_common.h
+++ b/drivers/remoteproc/mtk_common.h
@@ -55,6 +55,10 @@
 #define MT8192_CORE0_WDT_IRQ		0x10030
 #define MT8192_CORE0_WDT_CFG		0x10034
 
+#define MT8195_SYS_STATUS		0x4004
+#define MT8195_CORE0_WDT		BIT(16)
+#define MT8195_CORE1_WDT		BIT(17)
+
 #define MT8195_L1TCM_SRAM_PDN_RESERVED_RSI_BITS		GENMASK(7, 4)
 
 #define MT8195_CPU1_SRAM_PD			0x1084
diff --git a/drivers/remoteproc/mtk_scp.c b/drivers/remoteproc/mtk_scp.c
index cfcb719ba50b..9fbbc4751433 100644
--- a/drivers/remoteproc/mtk_scp.c
+++ b/drivers/remoteproc/mtk_scp.c
@@ -222,6 +222,28 @@ static void mt8192_scp_irq_handler(struct mtk_scp *scp)
 	}
 }
 
+static void mt8195_scp_irq_handler(struct mtk_scp *scp)
+{
+	u32 scp_to_host;
+
+	scp_to_host = readl(scp->reg_base + MT8192_SCP2APMCU_IPC_SET);
+
+	if (scp_to_host & MT8192_SCP_IPC_INT_BIT) {
+		scp_ipi_handler(scp);
+	} else {
+		u32 reason = readl(scp->reg_base + MT8195_SYS_STATUS);
+
+		if (reason & MT8195_CORE1_WDT)
+			writel(1, scp->reg_base + MT8195_CORE1_WDT_IRQ);
+		else
+			writel(1, scp->reg_base + MT8192_CORE0_WDT_IRQ);
+
+		scp_wdt_handler(scp, reason);
+	}
+
+	writel(scp_to_host, scp->reg_base + MT8192_SCP2APMCU_IPC_CLR);
+}
+
 static void mt8195_scp_c1_irq_handler(struct mtk_scp *scp)
 {
 	u32 scp_to_host;
@@ -1260,7 +1282,7 @@ static const struct mtk_scp_of_data mt8192_of_data = {
 static const struct mtk_scp_of_data mt8195_of_data = {
 	.scp_clk_get = mt8195_scp_clk_get,
 	.scp_before_load = mt8195_scp_before_load,
-	.scp_irq_handler = mt8192_scp_irq_handler,
+	.scp_irq_handler = mt8195_scp_irq_handler,
 	.scp_reset_assert = mt8192_scp_reset_assert,
 	.scp_reset_deassert = mt8192_scp_reset_deassert,
 	.scp_stop = mt8195_scp_stop,
-- 
2.18.0

[PATCH v4 11/12] remoteproc: mediatek: Refine ipi handler error message

[Tinghan Shen]

The error message doesn't accurately reflect the cause of
the error. The error is due to a handler not being found,
not an invalid IPI ID.

Signed-off-by: Tinghan Shen <tinghan.shen@mediatek.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
---
 drivers/remoteproc/mtk_scp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/remoteproc/mtk_scp.c b/drivers/remoteproc/mtk_scp.c
index 9fbbc4751433..16b5de589d07 100644
--- a/drivers/remoteproc/mtk_scp.c
+++ b/drivers/remoteproc/mtk_scp.c
@@ -106,7 +106,7 @@ static void scp_ipi_handler(struct mtk_scp *scp)
 	scp_ipi_lock(scp, id);
 	handler = ipi_desc[id].handler;
 	if (!handler) {
-		dev_err(scp->dev, "No such ipi id = %d\n", id);
+		dev_err(scp->dev, "No handler for ipi id = %d\n", id);
 		scp_ipi_unlock(scp, id);
 		return;
 	}
-- 
2.18.0

[PATCH v4 12/12] arm64: dts: mediatek: mt8195: Add SCP 2nd core

[Tinghan Shen]

Rewrite the MT8195 SCP device node as a cluster and
add the SCP 2nd core in it.

Since the SCP device node is changed to multi-core structure,
enable SCP cluster to enable probing SCP core 0.

Signed-off-by: Tinghan Shen <tinghan.shen@mediatek.com>
---
 .../boot/dts/mediatek/mt8195-cherry.dtsi      |  4 +++
 arch/arm64/boot/dts/mediatek/mt8195.dtsi      | 30 ++++++++++++++-----
 2 files changed, 27 insertions(+), 7 deletions(-)

diff --git a/arch/arm64/boot/dts/mediatek/mt8195-cherry.dtsi b/arch/arm64/boot/dts/mediatek/mt8195-cherry.dtsi
index 56749cfe7c33..4f9bc7581adb 100644
--- a/arch/arm64/boot/dts/mediatek/mt8195-cherry.dtsi
+++ b/arch/arm64/boot/dts/mediatek/mt8195-cherry.dtsi
@@ -933,6 +933,10 @@
 	interrupts-extended = <&pio 222 IRQ_TYPE_LEVEL_HIGH>;
 };
 
+&scp_cluster {
+	status = "okay";
+};
+
 &scp {
 	status = "okay";
 
diff --git a/arch/arm64/boot/dts/mediatek/mt8195.dtsi b/arch/arm64/boot/dts/mediatek/mt8195.dtsi
index 8f1264d5290b..87e49f5fb7b3 100644
--- a/arch/arm64/boot/dts/mediatek/mt8195.dtsi
+++ b/arch/arm64/boot/dts/mediatek/mt8195.dtsi
@@ -826,14 +826,30 @@
 			clocks = <&infracfg_ao CLK_INFRA_AO_GCE2>;
 		};
 
-		scp: scp@10500000 {
-			compatible = "mediatek,mt8195-scp";
-			reg = <0 0x10500000 0 0x100000>,
-			      <0 0x10720000 0 0xe0000>,
-			      <0 0x10700000 0 0x8000>;
-			reg-names = "sram", "cfg", "l1tcm";
-			interrupts = <GIC_SPI 462 IRQ_TYPE_LEVEL_HIGH 0>;
+		scp_cluster: scp@10500000 {
+			compatible = "mediatek,mt8195-scp-dual";
+			reg = <0 0x10720000 0 0xe0000>, <0 0x10700000 0 0x8000>;
+			reg-names = "cfg", "l1tcm";
+			#address-cells = <1>;
+			#size-cells = <1>;
+			ranges = <0 0 0x10500000 0x100000>;
 			status = "disabled";
+
+			scp: scp@0 {
+				compatible = "mediatek,scp-core";
+				reg = <0x0 0xa0000>;
+				reg-names = "sram";
+				interrupts = <GIC_SPI 462 IRQ_TYPE_LEVEL_HIGH 0>;
+				status = "disabled";
+			};
+
+			scp_c1: scp@a0000 {
+				compatible = "mediatek,scp-core";
+				reg = <0xa0000 0x20000>;
+				reg-names = "sram";
+				interrupts = <GIC_SPI 463 IRQ_TYPE_LEVEL_HIGH 0>;
+				status = "disabled";
+			};
 		};
 
 		scp_adsp: clock-controller@10720000 {
-- 
2.18.0

Re: [PATCH v4 07/12] remoteproc: mediatek: Probe multi-core SCP

[AngeloGioacchino Del Regno]

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@mediatek.com>
> ---
>   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,

Re: [PATCH v4 06/12] remoteproc: mediatek: Extract remoteproc initialization flow

[AngeloGioacchino Del Regno]

Il 09/02/23 08:40, Tinghan Shen ha scritto:
> This is the preparation for probing multi-core SCP. The remoteproc
> initialization flow is similar on cores and is reuesd to avoid
> redundant code.
> 
> The registers of config and l1tcm are shared for multi-core
> SCP. Reuse the mapped addresses for all cores.
> 
> Signed-off-by: Tinghan Shen <tinghan.shen@mediatek.com>
> ---
>   drivers/remoteproc/mtk_common.h |  7 +++++
>   drivers/remoteproc/mtk_scp.c    | 55 +++++++++++++++++++++------------
>   2 files changed, 42 insertions(+), 20 deletions(-)
> 
> diff --git a/drivers/remoteproc/mtk_common.h b/drivers/remoteproc/mtk_common.h
> index 3778894c96f3..20c1a90be77d 100644
> --- a/drivers/remoteproc/mtk_common.h
> +++ b/drivers/remoteproc/mtk_common.h
> @@ -112,6 +112,13 @@ struct mtk_scp_of_data {
>   	size_t ipi_buf_offset;
>   };
>   
> +struct mtk_scp_of_regs {

That's not a common structure, but rather a commodity for internal flow: the right
place for this one is in mtk_scp.c

Regards,
Angelo

> +	void __iomem *reg_base;
> +	void __iomem *l1tcm_base;
> +	size_t l1tcm_size;
> +	phys_addr_t l1tcm_phys;
> +};
> +
>   struct mtk_scp {
>   	struct device *dev;
>   	struct rproc *rproc;
> diff --git a/drivers/remoteproc/mtk_scp.c b/drivers/remoteproc/mtk_scp.c
> index b92274067522..feebcadd56cd 100644
> --- a/drivers/remoteproc/mtk_scp.c
> +++ b/drivers/remoteproc/mtk_scp.c
> @@ -854,7 +854,8 @@ static void scp_remove_rpmsg_subdev(struct mtk_scp *scp)

Re: [PATCH v4 10/12] remoteproc: mediatek: Handle MT8195 SCP core 1 watchdog timeout

[AngeloGioacchino Del Regno]

Il 09/02/23 08:40, Tinghan Shen ha scritto:
> The MT8195 SCP core 1 watchdog timeout needs to be handled in the
> SCP core 0 IRQ handler because the MT8195 SCP core 1 watchdog timeout
> IRQ is wired on the same IRQ entry for core 0 watchdog timeout.
> MT8195 SCP has a watchdog status register to identify the watchdog
> timeout source when IRQ triggered.
> 
> Signed-off-by: Tinghan Shen <tinghan.shen@mediatek.com>
> ---
>   drivers/remoteproc/mtk_common.h |  4 ++++
>   drivers/remoteproc/mtk_scp.c    | 24 +++++++++++++++++++++++-
>   2 files changed, 27 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/remoteproc/mtk_common.h b/drivers/remoteproc/mtk_common.h
> index e4ef97f2d3a1..ca2395b98d27 100644
> --- a/drivers/remoteproc/mtk_common.h
> +++ b/drivers/remoteproc/mtk_common.h
> @@ -55,6 +55,10 @@
>   #define MT8192_CORE0_WDT_IRQ		0x10030
>   #define MT8192_CORE0_WDT_CFG		0x10034
>   
> +#define MT8195_SYS_STATUS		0x4004
> +#define MT8195_CORE0_WDT		BIT(16)
> +#define MT8195_CORE1_WDT		BIT(17)
> +
>   #define MT8195_L1TCM_SRAM_PDN_RESERVED_RSI_BITS		GENMASK(7, 4)
>   
>   #define MT8195_CPU1_SRAM_PD			0x1084
> diff --git a/drivers/remoteproc/mtk_scp.c b/drivers/remoteproc/mtk_scp.c
> index cfcb719ba50b..9fbbc4751433 100644
> --- a/drivers/remoteproc/mtk_scp.c
> +++ b/drivers/remoteproc/mtk_scp.c
> @@ -222,6 +222,28 @@ static void mt8192_scp_irq_handler(struct mtk_scp *scp)
>   	}
>   }
>   
> +static void mt8195_scp_irq_handler(struct mtk_scp *scp)

Looking at the C1 interrupt handler, I don't see any WDT timeout handling, hence
a question naturally arises:

Would it ever be possible for *both* CORE0 and CORE1 WDT timeout to happen
at the same time?

Meaning that MT8195_SYS_STATUS has *both* CORE0_WDT and CORE1_WDT bits set when
we reach this interrupt handler?
In that case, the fix would be to just change....

> +{
> +	u32 scp_to_host;
> +
> +	scp_to_host = readl(scp->reg_base + MT8192_SCP2APMCU_IPC_SET);
> +
> +	if (scp_to_host & MT8192_SCP_IPC_INT_BIT) {
> +		scp_ipi_handler(scp);
> +	} else {
> +		u32 reason = readl(scp->reg_base + MT8195_SYS_STATUS);
> +
> +		if (reason & MT8195_CORE1_WDT)
> +			writel(1, scp->reg_base + MT8195_CORE1_WDT_IRQ);
> +		else

...the 'else' to another conditional :-)

Regards,
Angelo

Re: [PATCH v4 01/12] dt-bindings: remoteproc: mediatek: Improve the rpmsg subnode definition

[Rob Herring]

On Thu, 09 Feb 2023 15:40:10 +0800, Tinghan Shen wrote:
> Improve the definition of the rpmsg subnode by
> assigning a distinct node name and adding the
> definition source of node properties.
> 
> Signed-off-by: Tinghan Shen <tinghan.shen@mediatek.com>
> ---
>  .../bindings/remoteproc/mtk,scp.yaml          | 31 +++++++++----------
>  1 file changed, 15 insertions(+), 16 deletions(-)
> 

Acked-by: Rob Herring <robh@kernel.org>

Re: [PATCH v4 03/12] dt-bindings: remoteproc: mediatek: Support MT8195 dual-core SCP

[Rob Herring]

On Thu, 09 Feb 2023 15:40:12 +0800, Tinghan Shen wrote:
> Extend the SCP binding to describe the MT8195 dual-core SCP.
> 
> Under different applications, the MT8195 SCP can be used as single-core
> or dual-core. This change keeps the single-core definition and
> adds new definitions for dual-core use case.
> 
> Signed-off-by: Tinghan Shen <tinghan.shen@mediatek.com>
> ---
>  .../bindings/remoteproc/mtk,scp.yaml          | 145 +++++++++++++++++-
>  1 file changed, 141 insertions(+), 4 deletions(-)
> 

Reviewed-by: Rob Herring <robh@kernel.org>

Re: [PATCH v4 10/12] remoteproc: mediatek: Handle MT8195 SCP core 1 watchdog timeout

[TingHan Shen (沈廷翰)]

On Thu, 2023-02-09 at 13:48 +0100, AngeloGioacchino Del Regno wrote:
> Il 09/02/23 08:40, Tinghan Shen ha scritto:
> > The MT8195 SCP core 1 watchdog timeout needs to be handled in the
> > SCP core 0 IRQ handler because the MT8195 SCP core 1 watchdog timeout
> > IRQ is wired on the same IRQ entry for core 0 watchdog timeout.
> > MT8195 SCP has a watchdog status register to identify the watchdog
> > timeout source when IRQ triggered.
> > 
> > Signed-off-by: Tinghan Shen <tinghan.shen@mediatek.com>
> > ---
> >   drivers/remoteproc/mtk_common.h |  4 ++++
> >   drivers/remoteproc/mtk_scp.c    | 24 +++++++++++++++++++++++-
> >   2 files changed, 27 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/remoteproc/mtk_common.h b/drivers/remoteproc/mtk_common.h
> > index e4ef97f2d3a1..ca2395b98d27 100644
> > --- a/drivers/remoteproc/mtk_common.h
> > +++ b/drivers/remoteproc/mtk_common.h
> > @@ -55,6 +55,10 @@
> >   #define MT8192_CORE0_WDT_IRQ		0x10030
> >   #define MT8192_CORE0_WDT_CFG		0x10034
> >   
> > +#define MT8195_SYS_STATUS		0x4004
> > +#define MT8195_CORE0_WDT		BIT(16)
> > +#define MT8195_CORE1_WDT		BIT(17)
> > +
> >   #define MT8195_L1TCM_SRAM_PDN_RESERVED_RSI_BITS		GENMASK(7, 4)
> >   
> >   #define MT8195_CPU1_SRAM_PD			0x1084
> > diff --git a/drivers/remoteproc/mtk_scp.c b/drivers/remoteproc/mtk_scp.c
> > index cfcb719ba50b..9fbbc4751433 100644
> > --- a/drivers/remoteproc/mtk_scp.c
> > +++ b/drivers/remoteproc/mtk_scp.c
> > @@ -222,6 +222,28 @@ static void mt8192_scp_irq_handler(struct mtk_scp *scp)
> >   	}
> >   }
> >   
> > +static void mt8195_scp_irq_handler(struct mtk_scp *scp)
> 
> Looking at the C1 interrupt handler, I don't see any WDT timeout handling, hence
> a question naturally arises:
> 
> Would it ever be possible for *both* CORE0 and CORE1 WDT timeout to happen
> at the same time?
> 
> Meaning that MT8195_SYS_STATUS has *both* CORE0_WDT and CORE1_WDT bits set when
> we reach this interrupt handler?
> In that case, the fix would be to just change....
> 
> > +{
> > +	u32 scp_to_host;
> > +
> > +	scp_to_host = readl(scp->reg_base + MT8192_SCP2APMCU_IPC_SET);
> > +
> > +	if (scp_to_host & MT8192_SCP_IPC_INT_BIT) {
> > +		scp_ipi_handler(scp);
> > +	} else {
> > +		u32 reason = readl(scp->reg_base + MT8195_SYS_STATUS);
> > +
> > +		if (reason & MT8195_CORE1_WDT)
> > +			writel(1, scp->reg_base + MT8195_CORE1_WDT_IRQ);
> > +		else
> 
> ...the 'else' to another conditional :-)
> 
> Regards,
> Angelo
> 
> 

Yes, it's possible. I overlooked this case.
Thanks!

-- 
Best regards,
TingHan