microblaze: Add support for device tree driven board configuration

This is minimum code required to be able to use device-tree
for u-boot initialization.
Currently only for device driver initialization.

Linker script change ensures DTB to be aligned
for both options CONFIG_OF_EMBED and CONFIG_OF_SEPARATE.

Signed-off-by: Michal Simek <monstr@monstr.eu>
Acked-by: Stephan Linz <linz@li-pro.net>
CC: Simon Glass <sjg@chromium.org>

diff --git a/arch/microblaze/config.mk b/arch/microblaze/config.mk
index aca79e2..b4935f0 100644 (file)
--- a/arch/microblaze/config.mk
+++ b/arch/microblaze/config.mk
@@ -31,3 +31,5 @@ CONFIG_STANDALONE_LOAD_ADDR ?= 0x80F00000
 PLATFORM_CPPFLAGS += -ffixed-r31 -D__microblaze__
 
 LDSCRIPT ?= $(SRCTREE)/$(CPUDIR)/u-boot.lds
+
+CONFIG_ARCH_DEVICE_TREE := microblaze

diff --git a/arch/microblaze/cpu/u-boot.lds b/arch/microblaze/cpu/u-boot.lds
index ee41145..d033a28 100644 (file)
--- a/arch/microblaze/cpu/u-boot.lds
+++ b/arch/microblaze/cpu/u-boot.lds
@@ -45,6 +45,7 @@ SECTIONS
        .data ALIGN(0x4):
        {
                __data_start = .;
+               dts/libdts.o (.data)
                *(.data)
                __data_end = .;
        }

diff --git a/arch/microblaze/include/asm/global_data.h b/arch/microblaze/include/asm/global_data.h
index 0dc4ce9..de3b8db 100644 (file)
--- a/arch/microblaze/include/asm/global_data.h
+++ b/arch/microblaze/include/asm/global_data.h
@@ -41,6 +41,7 @@ typedef       struct  global_data {
        unsigned long   precon_buf_idx; /* Pre-Console buffer index */
 #endif
        unsigned long   env_addr;       /* Address  of Environment struct */
+       const void      *fdt_blob;      /* Our device tree, NULL if none */
        unsigned long   env_valid;      /* Checksum of Environment valid? */
        unsigned long   fb_base;        /* base address of frame buffer */
        void            **jt;           /* jump table */

diff --git a/arch/microblaze/lib/board.c b/arch/microblaze/lib/board.c
index b80250a..942e18c 100644 (file)
--- a/arch/microblaze/lib/board.c
+++ b/arch/microblaze/lib/board.c
@@ -34,6 +34,7 @@
 #include <net.h>
 #include <asm/processor.h>
 #include <asm/microblaze_intc.h>
+#include <fdtdec.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -63,6 +64,9 @@ typedef int (init_fnc_t) (void);
 
 init_fnc_t *init_sequence[] = {
        env_init,
+#ifdef CONFIG_OF_CONTROL
+       fdtdec_check_fdt,
+#endif
        serial_init,
        console_init_f,
 #ifdef CONFIG_SYS_GPIO_0
@@ -103,6 +107,17 @@ void board_init (void)
 
        monitor_flash_len = __end - __text_start;
 
+#ifdef CONFIG_OF_EMBED
+       /* Get a pointer to the FDT */
+       gd->fdt_blob = _binary_dt_dtb_start;
+#elif defined CONFIG_OF_SEPARATE
+       /* FDT is at end of image */
+       gd->fdt_blob = (void *)__end;
+#endif
+       /* Allow the early environment to override the fdt address */
+       gd->fdt_blob = (void *)getenv_ulong("fdtcontroladdr", 16,
+                                               (uintptr_t)gd->fdt_blob);
+
        /*
         * The Malloc area is immediately below the monitor copy in DRAM
         * aka CONFIG_SYS_MONITOR_BASE - Note there is no need for reloc_off
@@ -121,6 +136,15 @@ void board_init (void)
                }
        }
 
+#ifdef CONFIG_OF_CONTROL
+       /* For now, put this check after the console is ready */
+       if (fdtdec_prepare_fdt()) {
+               panic("** CONFIG_OF_CONTROL defined but no FDT - please see "
+                       "doc/README.fdt-control");
+       } else
+               printf("DTB: 0x%x\n", (u32)gd->fdt_blob);
+#endif
+
        puts ("SDRAM :\n");
        printf ("\t\tIcache:%s\n", icache_status() ? "ON" : "OFF");
        printf ("\t\tDcache:%s\n", dcache_status() ? "ON" : "OFF");