riscv64: add sg2042 support

Documentation/devicetree/bindings/mfd/syscon.yaml

@@ -112,6 +112,7 @@ select:
           - rockchip,rk3576-qos
           - rockchip,rk3588-qos
           - rockchip,rv1126-qos
+          - sophgo,sg2042-pcie-ctrl
           - st,spear1340-misc
           - stericsson,nomadik-pmu
           - starfive,jh7100-sysmain
@@ -215,6 +216,7 @@ properties:
           - rockchip,rk3576-qos
           - rockchip,rk3588-qos
           - rockchip,rv1126-qos
+          - sophgo,sg2042-pcie-ctrl
           - st,spear1340-misc
           - stericsson,nomadik-pmu
           - starfive,jh7100-sysmain

Documentation/devicetree/bindings/net/snps,dwmac.yaml

@@ -30,6 +30,7 @@ select:
           - snps,dwmac-4.00
           - snps,dwmac-4.10a
           - snps,dwmac-4.20a
+          - snps,dwmac-5.00a
           - snps,dwmac-5.10a
           - snps,dwmac-5.20
           - snps,dwmac-5.30a
@@ -97,11 +98,13 @@ properties:
         - snps,dwmac-4.00
         - snps,dwmac-4.10a
         - snps,dwmac-4.20a
+        - snps,dwmac-5.00a
         - snps,dwmac-5.10a
         - snps,dwmac-5.20
         - snps,dwmac-5.30a
         - snps,dwxgmac
         - snps,dwxgmac-2.10
+        - sophgo,sg2042-dwmac
         - sophgo,sg2044-dwmac
         - starfive,jh7100-dwmac
         - starfive,jh7110-dwmac
@@ -634,6 +637,7 @@ allOf:
                 - snps,dwmac-4.00
                 - snps,dwmac-4.10a
                 - snps,dwmac-4.20a
+                - snps,dwmac-5.00a
                 - snps,dwmac-5.10a
                 - snps,dwmac-5.20
                 - snps,dwmac-5.30a

Documentation/devicetree/bindings/net/sophgo,sg2044-dwmac.yaml

@@ -15,14 +15,19 @@ select:
       contains:
         enum:
           - sophgo,sg2044-dwmac
+          - sophgo,sg2042-dwmac
   required:
     - compatible
 
 properties:
   compatible:
-    items:
-      - const: sophgo,sg2044-dwmac
-      - const: snps,dwmac-5.30a
+    oneOf:
+      - items:
+          - const: sophgo,sg2042-dwmac
+          - const: snps,dwmac-5.00a
+      - items:
+          - const: sophgo,sg2044-dwmac
+          - const: snps,dwmac-5.30a
 
   reg:
     maxItems: 1

Documentation/devicetree/bindings/pci/sophgo,sg2042-pcie-host.yaml

@@ -0,0 +1,147 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/pci/sophgo,sg2042-pcie-host.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Sophgo SG2042 PCIe Host (Cadence PCIe Wrapper)
+
+description:
+  Sophgo SG2042 PCIe host controller is based on the Cadence PCIe core.
+
+maintainers:
+  - Chen Wang <[email protected]>
+
+properties:
+  compatible:
+    const: sophgo,sg2042-pcie-host
+
+  reg:
+    maxItems: 2
+
+  reg-names:
+    items:
+      - const: reg
+      - const: cfg
+
+  vendor-id:
+    const: 0x1f1c
+
+  device-id:
+    const: 0x2042
+
+  msi:
+    type: object
+    $ref: /schemas/interrupt-controller/msi-controller.yaml#
+    unevaluatedProperties: false
+
+    properties:
+      compatible:
+        items:
+          - const: sophgo,sg2042-pcie-msi
+
+      interrupts:
+        maxItems: 1
+
+      interrupt-names:
+        const: msi
+
+  msi-parent: true
+
+  sophgo,link-id:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: |
+      SG2042 uses Cadence IP, every IP is composed of 2 cores (called link0
+      & link1 as Cadence's term). Each core corresponds to a host bridge,
+      and each host bridge has only one root port. Their configuration
+      registers are completely independent. SG2042 integrates two Cadence IPs,
+      so there can actually be up to four host bridges. "sophgo,link-id" is
+      used to identify which core/link the PCIe host bridge node corresponds to.
+
+      The Cadence IP has two modes of operation, selected by a strap pin.
+
+      In the single-link mode, the Cadence PCIe core instance associated
+      with Link0 is connected to all the lanes and the Cadence PCIe core
+      instance associated with Link1 is inactive.
+
+      In the dual-link mode, the Cadence PCIe core instance associated
+      with Link0 is connected to the lower half of the lanes and the
+      Cadence PCIe core instance associated with Link1 is connected to
+      the upper half of the lanes.
+
+      SG2042 contains 2 Cadence IPs and configures the Cores as below:
+
+                     +-- Core (Link0) <---> pcie_rc0  +-----------------+
+                     |                                |                 |
+      Cadence IP 1 --+                                | cdns_pcie0_ctrl |
+                     |                                |                 |
+                     +-- Core (Link1) <---> disabled  +-----------------+
+
+                     +-- Core (Link0) <---> pcie_rc1  +-----------------+
+                     |                                |                 |
+      Cadence IP 2 --+                                | cdns_pcie1_ctrl |
+                     |                                |                 |
+                     +-- Core (Link1) <---> pcie_rc2  +-----------------+
+
+      pcie_rcX is PCIe node ("sophgo,sg2042-pcie-host") defined in DTS.
+
+      Sophgo defines some new register files to add support for their MSI
+      controller inside PCIe. These new register files are defined in DTS as
+      syscon node ("sophgo,sg2042-pcie-ctrl"), i.e. "cdns_pcie0_ctrl" /
+      "cdns_pcie1_ctrl". cdns_pcieX_ctrl contains some registers shared by
+      pcie_rcX, even two RC (Link)s may share different bits of the same
+      register. For example, cdns_pcie1_ctrl contains registers shared by
+      link0 & link1 for Cadence IP 2.
+
+      "sophgo,link-id" is defined to distinguish the two RC's in one Cadence IP,
+      so we can know what registers (bits) we should use.
+
+  sophgo,syscon-pcie-ctrl:
+    $ref: /schemas/types.yaml#/definitions/phandle
+    description:
+      Phandle to the PCIe System Controller DT node. It's required to
+      access some MSI operation registers shared by PCIe RCs.
+
+allOf:
+  - $ref: cdns-pcie-host.yaml#
+
+required:
+  - compatible
+  - reg
+  - reg-names
+  - vendor-id
+  - device-id
+  - sophgo,link-id
+  - sophgo,syscon-pcie-ctrl
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    pcie@62000000 {
+      compatible = "sophgo,sg2042-pcie-host";
+      device_type = "pci";
+      reg = <0x62000000  0x00800000>,
+            <0x48000000  0x00001000>;
+      reg-names = "reg", "cfg";
+      #address-cells = <3>;
+      #size-cells = <2>;
+      ranges = <0x81000000 0 0x00000000 0xde000000 0 0x00010000>,
+               <0x82000000 0 0xd0400000 0xd0400000 0 0x0d000000>;
+      bus-range = <0x00 0xff>;
+      vendor-id = <0x1f1c>;
+      device-id = <0x2042>;
+      cdns,no-bar-match-nbits = <48>;
+      sophgo,link-id = <0>;
+      sophgo,syscon-pcie-ctrl = <&cdns_pcie1_ctrl>;
+      msi-parent = <&msi_pcie>;
+      msi_pcie: msi {
+        compatible = "sophgo,sg2042-pcie-msi";
+        msi-controller;
+        interrupt-parent = <&intc>;
+        interrupts = <123 IRQ_TYPE_LEVEL_HIGH>;
+        interrupt-names = "msi";
+      };
+    };

Documentation/devicetree/bindings/riscv/sophgo.yaml

@@ -34,6 +34,8 @@ properties:
       - items:
           - enum:
               - milkv,pioneer
+              - sophgo,sg2042-evb-v1
+              - sophgo,sg2042-evb-v2
           - const: sophgo,sg2042
 
 additionalProperties: true

Documentation/devicetree/bindings/spi/spi-sg2044-nor.yaml

@@ -14,7 +14,12 @@ allOf:
 
 properties:
   compatible:
-    const: sophgo,sg2044-spifmc-nor
+    oneOf:
+      - const: sophgo,sg2044-spifmc-nor
+      - items:
+          - enum:
+              - sophgo,sg2042-spifmc-nor
+          - const: sophgo,sg2044-spifmc-nor
 
   reg:
     maxItems: 1

arch/riscv/Kconfig

@@ -57,7 +57,7 @@ config RISCV
 	select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
 	select ARCH_HAS_UBSAN
 	select ARCH_HAS_VDSO_ARCH_DATA if GENERIC_VDSO_DATA_STORE
-	select ARCH_KEEP_MEMBLOCK if ACPI
+	select ARCH_KEEP_MEMBLOCK
 	select ARCH_MHP_MEMMAP_ON_MEMORY_ENABLE	if 64BIT && MMU
 	select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
 	select ARCH_OPTIONAL_KERNEL_RWX_DEFAULT
@@ -491,9 +491,7 @@ config NUMA
 	depends on SMP && MMU
 	select ARCH_SUPPORTS_NUMA_BALANCING
 	select GENERIC_ARCH_NUMA
-	select HAVE_SETUP_PER_CPU_AREA
 	select NEED_PER_CPU_EMBED_FIRST_CHUNK
-	select NEED_PER_CPU_PAGE_FIRST_CHUNK
 	select OF_NUMA
 	select USE_PERCPU_NUMA_NODE_ID
 	help

arch/riscv/Kconfig.errata

@@ -130,4 +130,23 @@ config ERRATA_THEAD_GHOSTWRITE
 
 	  If you don't know what to do here, say "Y".
 
+config ERRATA_THEAD_WRITE_ONCE
+	bool "Apply T-Head WRITE_ONCE errata"
+	depends on ERRATA_THEAD
+	default y
+	help
+	  The early version of T-Head C9xx cores of sg2042 & th1520 have a store
+	  merge buffer delay problem. The store merge buffer could improve the
+	  store queue performance by merging multi-store requests, but when there
+	  are no continued store requests, the prior single store request would be
+	  waiting in the store queue for a long time. That would cause signifi-
+	  cant problems for communication between multi-cores. Appending a
+	  fence w.o could immediately flush the store merge buffer and let other
+	  cores see the write result.
+
+	  This will apply the WRITE_ONCE errata to handle the non-standard beh-
+	  avior via appending a fence w.o instruction for WRITE_ONCE().
+
+	  If you don't know what to do here, say "Y".
+
 endmenu # "CPU errata selection"

arch/riscv/boot/dts/sophgo/Makefile

@@ -3,3 +3,5 @@ dtb-$(CONFIG_ARCH_SOPHGO) += cv1800b-milkv-duo.dtb
 dtb-$(CONFIG_ARCH_SOPHGO) += cv1812h-huashan-pi.dtb
 dtb-$(CONFIG_ARCH_SOPHGO) += sg2002-licheerv-nano-b.dtb
 dtb-$(CONFIG_ARCH_SOPHGO) += sg2042-milkv-pioneer.dtb
+dtb-$(CONFIG_ARCH_SOPHGO) += sg2042-evb-v1.dtb
+dtb-$(CONFIG_ARCH_SOPHGO) += sg2042-evb-v2.dtb