ARM: add flat device tree support

Based on other architectures already supported.
Tested on OMAP3 Beagle board and another unnamed ARM platform.

Signed-off-by: John Rigby <john.rigby@linaro.org>
Tested-by: Rob Herring <rob.herring@smooth-stone.com>
Acked-by: Wolfgang Denk <wd@denx.de>

diff --git a/arch/arm/include/asm/config.h b/arch/arm/include/asm/config.h
index 4e8dfd7..d8e33fc 100644 (file)
--- a/arch/arm/include/asm/config.h
+++ b/arch/arm/include/asm/config.h
@@ -25,4 +25,6 @@
 /* Relocation to SDRAM works on all ARM boards */
 #define CONFIG_RELOC_FIXUP_WORKS
 #endif
+#define CONFIG_LMB
+#define CONFIG_SYS_BOOT_RAMDISK_HIGH
 #endif

diff --git a/arch/arm/lib/bootm.c b/arch/arm/lib/bootm.c
index 3101321..2e7b2e1 100644 (file)
--- a/arch/arm/lib/bootm.c
+++ b/arch/arm/lib/bootm.c
@@ -26,6 +26,9 @@
 #include <image.h>
 #include <u-boot/zlib.h>
 #include <asm/byteorder.h>
+#include <fdt.h>
+#include <libfdt.h>
+#include <fdt_support.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -50,12 +53,52 @@ static void setup_end_tag (bd_t *bd);
 static struct tag *params;
 #endif /* CONFIG_SETUP_MEMORY_TAGS || CONFIG_CMDLINE_TAG || CONFIG_INITRD_TAG */
 
-int do_bootm_linux(int flag, int argc, char * const argv[], bootm_headers_t *images)
+static ulong get_sp(void);
+#if defined(CONFIG_OF_LIBFDT)
+static int bootm_linux_fdt(int machid, bootm_headers_t *images);
+#endif
+
+void arch_lmb_reserve(struct lmb *lmb)
+{
+       ulong sp;
+
+       /*
+        * Booting a (Linux) kernel image
+        *
+        * Allocate space for command line and board info - the
+        * address should be as high as possible within the reach of
+        * the kernel (see CONFIG_SYS_BOOTMAPSZ settings), but in unused
+        * memory, which means far enough below the current stack
+        * pointer.
+        */
+       sp = get_sp();
+       debug("## Current stack ends at 0x%08lx ", sp);
+
+       /* adjust sp by 1K to be safe */
+       sp -= 1024;
+       lmb_reserve(lmb, sp,
+                   gd->bd->bi_dram[0].start + gd->bd->bi_dram[0].size - sp);
+}
+
+static void announce_and_cleanup(void)
+{
+       printf("\nStarting kernel ...\n\n");
+
+#ifdef CONFIG_USB_DEVICE
+       {
+               extern void udc_disconnect(void);
+               udc_disconnect();
+       }
+#endif
+       cleanup_before_linux();
+}
+
+int do_bootm_linux(int flag, int argc, char *argv[], bootm_headers_t *images)
 {
        bd_t    *bd = gd->bd;
        char    *s;
        int     machid = bd->bi_arch_number;
-       void    (*theKernel)(int zero, int arch, uint params);
+       void    (*kernel_entry)(int zero, int arch, uint params);
 
 #ifdef CONFIG_CMDLINE_TAG
        char *commandline = getenv ("bootargs");
@@ -64,8 +107,6 @@ int do_bootm_linux(int flag, int argc, char * const argv[], bootm_headers_t *ima
        if ((flag != 0) && (flag != BOOTM_STATE_OS_GO))
                return 1;
 
-       theKernel = (void (*)(int, int, uint))images->ep;
-
        s = getenv ("machid");
        if (s) {
                machid = simple_strtoul (s, NULL, 16);
@@ -74,8 +115,15 @@ int do_bootm_linux(int flag, int argc, char * const argv[], bootm_headers_t *ima
 
        show_boot_progress (15);
 
+#ifdef CONFIG_OF_LIBFDT
+       if (images->ft_len)
+               return bootm_linux_fdt(machid, images);
+#endif
+
+       kernel_entry = (void (*)(int, int, uint))images->ep;
+
        debug ("## Transferring control to Linux (at address %08lx) ...\n",
-              (ulong) theKernel);
+              (ulong) kernel_entry);
 
 #if defined (CONFIG_SETUP_MEMORY_TAGS) || \
     defined (CONFIG_CMDLINE_TAG) || \
@@ -99,27 +147,76 @@ int do_bootm_linux(int flag, int argc, char * const argv[], bootm_headers_t *ima
        if (images->rd_start && images->rd_end)
                setup_initrd_tag (bd, images->rd_start, images->rd_end);
 #endif
-       setup_end_tag (bd);
+       setup_end_tag(bd);
 #endif
 
-       /* we assume that the kernel is in place */
-       printf ("\nStarting kernel ...\n\n");
+       announce_and_cleanup();
 
-#ifdef CONFIG_USB_DEVICE
-       {
-               extern void udc_disconnect (void);
-               udc_disconnect ();
+       kernel_entry(0, machid, bd->bi_boot_params);
+       /* does not return */
+
+       return 1;
+}
+
+#if defined(CONFIG_OF_LIBFDT)
+static int fixup_memory_node(void *blob)
+{
+       bd_t    *bd = gd->bd;
+       int bank;
+       u64 start[CONFIG_NR_DRAM_BANKS];
+       u64 size[CONFIG_NR_DRAM_BANKS];
+
+       for (bank = 0; bank < CONFIG_NR_DRAM_BANKS; bank++) {
+               start[bank] = bd->bi_dram[bank].start;
+               size[bank] = bd->bi_dram[bank].size;
        }
-#endif
 
-       cleanup_before_linux ();
+       return fdt_fixup_memory_banks(blob, start, size, CONFIG_NR_DRAM_BANKS);
+}
+
+static int bootm_linux_fdt(int machid, bootm_headers_t *images)
+{
+       ulong rd_len;
+       bd_t *bd = gd->bd;
+       char *s;
+       void (*kernel_entry)(int zero, int dt_machid, void *dtblob);
+       ulong bootmap_base = getenv_bootm_low();
+       ulong of_size = images->ft_len;
+       char **of_flat_tree = &images->ft_addr;
+       ulong *initrd_start = &images->initrd_start;
+       ulong *initrd_end = &images->initrd_end;
+       struct lmb *lmb = &images->lmb;
+       int ret;
+
+       kernel_entry = (void (*)(int, int, void *))images->ep;
+
+       rd_len = images->rd_end - images->rd_start;
+       ret = boot_ramdisk_high(lmb, images->rd_start, rd_len,
+                               initrd_start, initrd_end);
+       if (ret)
+               return ret;
+
+       ret = boot_relocate_fdt(lmb, bootmap_base, of_flat_tree, &of_size);
+       if (ret)
+               return ret;
 
-       theKernel (0, machid, bd->bi_boot_params);
+       debug("## Transferring control to Linux (at address %08lx) ...\n",
+              (ulong) kernel_entry);
+
+       fdt_chosen(*of_flat_tree, 1);
+
+       fixup_memory_node(*of_flat_tree);
+
+       fdt_initrd(*of_flat_tree, *initrd_start, *initrd_end, 1);
+
+       announce_and_cleanup();
+
+       kernel_entry(0, machid, *of_flat_tree);
        /* does not return */
 
        return 1;
 }
-
+#endif
 
 #if defined (CONFIG_SETUP_MEMORY_TAGS) || \
     defined (CONFIG_CMDLINE_TAG) || \
@@ -239,4 +336,12 @@ static void setup_end_tag (bd_t *bd)
        params->hdr.size = 0;
 }
 
+static ulong get_sp(void)
+{
+       ulong ret;
+
+       asm("mov %0, sp" : "=r"(ret) : );
+       return ret;
+}
+
 #endif /* CONFIG_SETUP_MEMORY_TAGS || CONFIG_CMDLINE_TAG || CONFIG_INITRD_TAG */