[PATCH v3 11/19] LoongArch: Generic platform type

From: Jiaxun Yang <[email protected]>

Provide a generic platform with some common routines expected to be
implemented at CPU level.

Signed-off-by: Jiaxun Yang <[email protected]>
Signed-off-by: Yao Zi <[email protected]>
---

Changed from v2
- Select CPU if DISPLAY_INFO is enabled
- Reword the commit message, re-titled as "LoongArch: Generic platform
  type"
- Fix the comment for cleanup_before_linux() to note that cache isn't
  disabled, captilize Linux
- Drop unused DECLARE_GLOBAL_DATA_PTR from cpu/generic/dram.c

No changes since v1

 arch/loongarch/Kconfig              |  1 +
 arch/loongarch/cpu/generic/Kconfig  | 13 +++++++++++++
 arch/loongarch/cpu/generic/Makefile |  7 +++++++
 arch/loongarch/cpu/generic/cpu.c    | 22 ++++++++++++++++++++++
 arch/loongarch/cpu/generic/dram.c   | 16 ++++++++++++++++
 5 files changed, 59 insertions(+)
 create mode 100644 arch/loongarch/cpu/generic/Kconfig
 create mode 100644 arch/loongarch/cpu/generic/Makefile
 create mode 100644 arch/loongarch/cpu/generic/cpu.c
 create mode 100644 arch/loongarch/cpu/generic/dram.c

diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig
index 5654de5a58c7..c5ef82b583b1 100644
--- a/arch/loongarch/Kconfig
+++ b/arch/loongarch/Kconfig
@@ -12,6 +12,7 @@ endchoice
 # board-specific options below
 
 # platform-specific options below
+source "arch/loongarch/cpu/generic/Kconfig"
 
 # architecture-specific options below
 choice
diff --git a/arch/loongarch/cpu/generic/Kconfig b/arch/loongarch/cpu/generic/Kconfig
new file mode 100644
index 000000000000..5fcc2156906d
--- /dev/null
+++ b/arch/loongarch/cpu/generic/Kconfig
@@ -0,0 +1,13 @@
+# SPDX-License-Identifier: GPL-2.0+
+#
+# Copyright (C) 2024 Jiaxun yang <[email protected]>
+#
+
+config GENERIC_LOONGARCH
+	bool
+	select SYS_CACHE_SHIFT_6
+	imply CPU
+	imply CPU_LOONGARCH
+	imply LOONGARCH_TIMER
+	imply CMD_CPU
+	select CPU if DISPLAY_CPUINFO
diff --git a/arch/loongarch/cpu/generic/Makefile b/arch/loongarch/cpu/generic/Makefile
new file mode 100644
index 000000000000..c98d63b4f831
--- /dev/null
+++ b/arch/loongarch/cpu/generic/Makefile
@@ -0,0 +1,7 @@
+# SPDX-License-Identifier: GPL-2.0+
+#
+# Copyright (C) 2024 Jiaxun yang <[email protected]>
+#
+
+obj-y += dram.o
+obj-y += cpu.o
diff --git a/arch/loongarch/cpu/generic/cpu.c b/arch/loongarch/cpu/generic/cpu.c
new file mode 100644
index 000000000000..7eae927b0003
--- /dev/null
+++ b/arch/loongarch/cpu/generic/cpu.c
@@ -0,0 +1,22 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2024 Jiaxun Yang <[email protected]>
+ */
+
+#include <irq_func.h>
+#include <asm/cache.h>
+
+/*
+ * cleanup_before_linux() is called just before we call Linux, it prepares the
+ * processor for linux
+ *
+ * We disable interrupts and flush caches.
+ */
+int cleanup_before_linux(void)
+{
+	disable_interrupts();
+
+	cache_flush();
+
+	return 0;
+}
diff --git a/arch/loongarch/cpu/generic/dram.c b/arch/loongarch/cpu/generic/dram.c
new file mode 100644
index 000000000000..26cabc4b3ccf
--- /dev/null
+++ b/arch/loongarch/cpu/generic/dram.c
@@ -0,0 +1,16 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2024 Jiaxun Yang <[email protected]>
+ */
+
+#include <fdtdec.h>
+
+int dram_init(void)
+{
+	return fdtdec_setup_mem_size_base_lowest();
+}
+
+int dram_init_banksize(void)
+{
+	return fdtdec_setup_memory_banksize();
+}
-- 
2.55.0