Siflower MIPS SoCs like SF19A2890 uses dual-core MIPS InterAptiv
processor, built-in GMAC, USB, dual-band WiFi and various other
peripherals.
Notably, it uses some ARM PLxxx peripherals, and ARM_AMBA is
selected for the drivers.
Most devices on the market with this chip come with 64M or less
DRAM. A kmalloc.h with malloc alignment override is added to
conserve memory, and a MACH_SIFLOWER_MIPS is created with reduced
features instead of using the generic kernel.

Signed-off-by: Chuanhong Guo <gch981213@gmail.com>
---
 arch/mips/Kconfig                             | 30 +++++++++++++++++++
 arch/mips/generic/Platform                    |  1 +
 arch/mips/include/asm/mach-siflower/kmalloc.h |  9 ++++++
 3 files changed, 40 insertions(+)
 create mode 100644 arch/mips/include/asm/mach-siflower/kmalloc.h

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 1924f2d83932..e26636f2bc66 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -895,6 +895,36 @@ config SIBYTE_BIGSUR
 	select ZONE_DMA32 if 64BIT
 	select SWIOTLB if ARCH_DMA_ADDR_T_64BIT && PCI
 
+config MACH_SIFLOWER_MIPS
+	bool "Siflower MIPS SoCs"
+	select MIPS_GENERIC
+	select MACH_GENERIC_CORE
+	select ARM_AMBA
+	select BOOT_RAW
+	select CEVT_R4K
+	select CLKSRC_MIPS_GIC
+	select COMMON_CLK
+	select CPU_MIPSR2_IRQ_EI
+	select CPU_MIPSR2_IRQ_VI
+	select CSRC_R4K
+	select DMA_NONCOHERENT
+	select IRQ_MIPS_CPU
+	select MIPS_CPU_SCACHE
+	select MIPS_GIC
+	select MIPS_L1_CACHE_SHIFT_5
+	select NO_EXCEPT_FILL
+	select SMP_UP if SMP
+	select SYS_HAS_CPU_MIPS32_R2
+	select SYS_SUPPORTS_32BIT_KERNEL
+	select SYS_SUPPORTS_LITTLE_ENDIAN
+	select SYS_SUPPORTS_MIPS16
+	select SYS_SUPPORTS_MIPS_CPS
+	select SYS_SUPPORTS_MULTITHREADING
+	select USE_OF
+	help
+	  Select this to build a kernel which supports SoCs from Siflower
+	  with MIPS InterAptiv cores, like Siflower SF19A2890.
+
 config SNI_RM
 	bool "SNI RM200/300/400"
 	select ARC_MEMORY
diff --git a/arch/mips/generic/Platform b/arch/mips/generic/Platform
index 0c03623f3897..c09a8484db9b 100644
--- a/arch/mips/generic/Platform
+++ b/arch/mips/generic/Platform
@@ -10,6 +10,7 @@
 
 # Note: order matters, keep the asm/mach-generic include last.
 cflags-$(CONFIG_MACH_INGENIC_SOC)	+= -I$(srctree)/arch/mips/include/asm/mach-ingenic
+cflags-$(CONFIG_MACH_SIFLOWER_MIPS)	+= -I$(srctree)/arch/mips/include/asm/mach-siflower
 cflags-$(CONFIG_MIPS_GENERIC)	+= -I$(srctree)/arch/mips/include/asm/mach-generic
 
 load-$(CONFIG_MIPS_GENERIC)	+= 0xffffffff80100000
diff --git a/arch/mips/include/asm/mach-siflower/kmalloc.h b/arch/mips/include/asm/mach-siflower/kmalloc.h
new file mode 100644
index 000000000000..d0b270e2ec64
--- /dev/null
+++ b/arch/mips/include/asm/mach-siflower/kmalloc.h
@@ -0,0 +1,9 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __ASM_MACH_SIFLOWER_KMALLOC_H
+#define __ASM_MACH_SIFLOWER_KMALLOC_H
+
+#ifdef CONFIG_DMA_NONCOHERENT
+#define ARCH_DMA_MINALIGN	32
+#endif
+
+#endif /* __ASM_MACH_SIFLOWER_KMALLOC_H */
-- 
2.48.1

在2025年1月20日一月 上午1:52，Chuanhong Guo写道：
> Siflower MIPS SoCs like SF19A2890 uses dual-core MIPS InterAptiv
> processor, built-in GMAC, USB, dual-band WiFi and various other
> peripherals.
> Notably, it uses some ARM PLxxx peripherals, and ARM_AMBA is
> selected for the drivers.
> Most devices on the market with this chip come with 64M or less
> DRAM. A kmalloc.h with malloc alignment override is added to
> conserve memory, and a MACH_SIFLOWER_MIPS is created with reduced
> features instead of using the generic kernel.
>
> Signed-off-by: Chuanhong Guo <gch981213@gmail.com>

Hmm, why not using MIPS_GENERIC.

Thanks
- Jiaxun

[...]

-- 
- Jiaxun

On Wed, Jan 22, 2025 at 8:05 PM Jiaxun Yang <jiaxun.yang@flygoat.com> wrote:
>
>
>
> 在2025年1月20日一月 上午1:52，Chuanhong Guo写道：
> > Siflower MIPS SoCs like SF19A2890 uses dual-core MIPS InterAptiv
> > processor, built-in GMAC, USB, dual-band WiFi and various other
> > peripherals.
> > Notably, it uses some ARM PLxxx peripherals, and ARM_AMBA is
> > selected for the drivers.
> > Most devices on the market with this chip come with 64M or less
> > DRAM. A kmalloc.h with malloc alignment override is added to
> > conserve memory, and a MACH_SIFLOWER_MIPS is created with reduced
> > features instead of using the generic kernel.
> >
> > Signed-off-by: Chuanhong Guo <gch981213@gmail.com>
>
> Hmm, why not using MIPS_GENERIC.

Mainly to override MIPS_L1_CACHE_SHIFT and ARCH_DMA_MINALIGN.
This saves about 1MB of memory if I remember correctly.

-- 
Regards,
Chuanhong Guo