aspeed: Add basic ast2500-specific drivers and configuration
Clock Driver
This driver is ast2500-specific and is not compatible with earlier
versions of this chip. The differences are not that big, but they are
in somewhat random places, so making it compatible with ast2400 is not
worth the effort at the moment.
SDRAM MC driver
The driver is very ast2500-specific and is completely incompatible
with previous versions of the chip.
The memory controller is very poorly documented by Aspeed in the
datasheet, with any mention of the whole range of registers missing. The
initialization procedure has been basically taken from Aspeed SDK, where
it is implemented in assembly. Here it is rewritten in C, with very limited
understanding of what exactly it is doing.
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/arm/mach-aspeed/ast2500/Kconfig b/arch/arm/mach-aspeed/ast2500/Kconfig
new file mode 100644
index 0000000..05cb27e
--- /dev/null
+++ b/arch/arm/mach-aspeed/ast2500/Kconfig
@@ -0,0 +1,14 @@
+if ASPEED_AST2500
+
+config SYS_CPU
+ default "arm1176"
+
+config TARGET_EVB_AST2500
+ bool "Evb-AST2500"
+ help
+ Evb-AST2500 is Aspeed evaluation board for AST2500 chip.
+ It has 512M of RAM, 32M of SPI flash, two Ethernet ports,
+ 4 Serial ports, 4 USB ports, VGA port, PCIe, SD card slot,
+ 20 pin JTAG, pinouts for 14 I2Cs, 3 SPIs and eSPI, 8 PWMs.
+
+endif