From 8d64090a68a47fbcfea162b488542fd325b7c2b8 Mon Sep 17 00:00:00 2001
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Date: Fri, 15 May 2020 17:43:51 +1000
Subject: [PATCH] sw: Add full memory map to .h and use it for litedram .lds

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
---
 include/microwatt_soc.h                       | 24 +++++++++++++------
 litedram/gen-src/sdram_init/Makefile          |  6 +++--
 .../{sdram_init.lds => sdram_init.lds.S}      |  8 ++++---
 soc.vhdl                                      |  2 +-
 4 files changed, 27 insertions(+), 13 deletions(-)
 rename litedram/gen-src/sdram_init/{sdram_init.lds => sdram_init.lds.S} (63%)

diff --git a/include/microwatt_soc.h b/include/microwatt_soc.h
index 16871a4..b0dab83 100644
--- a/include/microwatt_soc.h
+++ b/include/microwatt_soc.h
@@ -2,9 +2,21 @@
 #define __MICROWATT_SOC_H
 
 /*
- * Definitions for the syscon registers
+ * Microwatt SoC memory map
+ */
+
+#define MEMORY_BASE     0x00000000  /* "Main" memory alias, either BRAM or DRAM */
+#define DRAM_BASE       0x40000000  /* DRAM if present */
+#define SYSCON_BASE	0xc0000000  /* System control regs */
+#define UART_BASE	0xc0002000  /* UART */
+#define XICS_BASE   	0xc0004000  /* Interrupt controller */
+#define DRAM_CTRL_BASE	0xc0100000  /* LiteDRAM control registers */
+#define BRAM_BASE       0xf0000000  /* Internal BRAM */
+#define DRAM_INIT_BASE  0xffff0000  /* Internal DRAM init firmware */
+
+/*
+ * Register definitions for the syscon registers
  */
-#define SYSCON_BASE	0xc0000000
 
 #define SYS_REG_SIGNATURE		0x00
 #define SYS_REG_INFO			0x08
@@ -18,9 +30,9 @@
 #define   SYS_REG_CTRL_CORE_RESET		(1ull << 1)
 #define   SYS_REG_CTRL_SOC_RESET		(1ull << 2)
 
-/* Definition for the "Potato" UART */
-#define UART_BASE	0xc0002000
-
+/*
+ * Register definitions for the potato UART
+ */
 #define POTATO_CONSOLE_TX		0x00
 #define POTATO_CONSOLE_RX		0x08
 #define POTATO_CONSOLE_STATUS		0x10
@@ -31,7 +43,5 @@
 #define POTATO_CONSOLE_CLOCK_DIV	0x18
 #define POTATO_CONSOLE_IRQ_EN		0x20
 
-/* Definition for the LiteDRAM control registers */
-#define DRAM_CTRL_BASE	0xc0100000
 
 #endif /* __MICROWATT_SOC_H */
diff --git a/litedram/gen-src/sdram_init/Makefile b/litedram/gen-src/sdram_init/Makefile
index 4bc3e7b..420072e 100644
--- a/litedram/gen-src/sdram_init/Makefile
+++ b/litedram/gen-src/sdram_init/Makefile
@@ -26,7 +26,7 @@ CPPFLAGS += -I$(SRC_DIR)/libc/include -I$(LXSRC_DIR) -I$(LXINC_DIR) -I$(GENINC_D
 CPPFLAGS += -isystem $(shell $(CC) -print-file-name=include)
 CFLAGS = -Os -g -Wall -std=c99 -m64 -mabi=elfv2 -msoft-float -mno-string -mno-multiple -mno-vsx -mno-altivec -mlittle-endian -fno-stack-protector -mstrict-align -ffreestanding -fdata-sections -ffunction-sections -fno-delete-null-pointer-checks 
 ASFLAGS = $(CPPFLAGS) $(CFLAGS)
-LDFLAGS = -static -nostdlib -Ttext-segment=0xffff0000 -T $(SRC_DIR)/$(PROGRAM).lds --gc-sections
+LDFLAGS = -static -nostdlib -T $(OBJ)/$(PROGRAM).lds --gc-sections
 
 #### Pretty print
 
@@ -58,13 +58,15 @@ $(OBJ)/%.o : $(SRC_DIR)/%.S
 	$(call Q,AS, $(CC) $(ASFLAGS) -c $< -o $@, $@)
 $(OBJ)/%.o : $(SRC_DIR)/libc/src/%.c
 	$(call Q,CC, $(CC) $(CPPFLAGS) $(CFLAGS) -c $< -o $@, $@)
+$(OBJ)/%.lds : $(SRC_DIR)/%.lds.S
+	$(call Q,CC, $(CC) $(CPPFLAGS) -P -E $< -o $@, $@)
 
 LIBC_SRC := $(wildcard $(SRC_DIR)/libc/src/*.c)
 LIBC_OBJ := $(patsubst $(SRC_DIR)/libc/src/%.c, $(OBJ)/%.o,$(LIBC_SRC))
 $(OBJ)/libc.o: $(LIBC_OBJ)
 	$(call Q,LD, $(LD) -r -o $@ $^, $@)
 
-$(OBJ)/$(PROGRAM).elf: $(OBJECTS) $(OBJ)/libc.o
+$(OBJ)/$(PROGRAM).elf: $(OBJECTS) $(OBJ)/libc.o $(OBJ)/$(PROGRAM).lds
 	$(call Q,LD, $(LD) $(LDFLAGS) -o $@ $^, $@)
 
 $(OBJ)/$(PROGRAM).bin: $(OBJ)/$(PROGRAM).elf
diff --git a/litedram/gen-src/sdram_init/sdram_init.lds b/litedram/gen-src/sdram_init/sdram_init.lds.S
similarity index 63%
rename from litedram/gen-src/sdram_init/sdram_init.lds
rename to litedram/gen-src/sdram_init/sdram_init.lds.S
index f76e77f..f1bc291 100644
--- a/litedram/gen-src/sdram_init/sdram_init.lds
+++ b/litedram/gen-src/sdram_init/sdram_init.lds.S
@@ -1,11 +1,13 @@
+#include "microwatt_soc.h"
+
 SECTIONS
 {
-	. = 0xffff0000;
+	. = DRAM_INIT_BASE;
 	start = .;
 	.head : {
 		KEEP(*(.head))
- 	}
-	. = 0xffff1000;
+	}
+	. = DRAM_INIT_BASE | 0x1000;
 	.text : { *(.text*) *(.sfpr) *(.rodata*) }
 	.data : { *(.data*) }
 	.bss : { *(.bss*) }
diff --git a/soc.vhdl b/soc.vhdl
index caa62cd..a42e071 100644
--- a/soc.vhdl
+++ b/soc.vhdl
@@ -10,7 +10,7 @@ use work.common.all;
 use work.wishbone_types.all;
 
 
--- Memory map:
+-- Memory map. *** Keep include/microwatt_soc.h updated on changes ***
 --
 -- 0x00000000: Block RAM (MEMORY_SIZE) or DRAM depending on syscon
 -- 0x40000000: DRAM (when present)