MIPS: ath79: Add basic device tree support

Add the bare minimum to load a device tree.

Signed-off-by: Alban Bedel <albeu@free.fr>
Cc: linux-mips@linux-mips.org
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

2 files changed, 27 insertions, 1 deletions

diff --git a/arch/mips/ath79/machtypes.h b/arch/mips/ath79/machtypes.h
index 26254058c545..a13db3d15c8f 100644
--- a/arch/mips/ath79/machtypes.h
+++ b/arch/mips/ath79/machtypes.h
@@ -15,6 +15,7 @@
 #include <asm/mips_machine.h>
 
 enum ath79_mach_type {
+        ATH79_MACH_GENERIC_OF = -1,     /* Device tree board */
         ATH79_MACH_GENERIC = 0,
         ATH79_MACH_AP121,               /* Atheros AP121 reference board */
         ATH79_MACH_AP136_010,           /* Atheros AP136-010 reference board */
diff --git a/arch/mips/ath79/setup.c b/arch/mips/ath79/setup.c
index 74f1af7eeefc..01a644f174dd 100644
--- a/arch/mips/ath79/setup.c
+++ b/arch/mips/ath79/setup.c
@@ -17,12 +17,16 @@
 #include <linux/bootmem.h>
 #include <linux/err.h>
 #include <linux/clk.h>
+#include <linux/of_platform.h>
+#include <linux/of_fdt.h>
 
 #include <asm/bootinfo.h>
 #include <asm/idle.h>
 #include <asm/time.h>           /* for mips_hpt_frequency */
 #include <asm/reboot.h>         /* for _machine_{restart,halt} */
 #include <asm/mips_machine.h>
+#include <asm/prom.h>
+#include <asm/fw/fw.h>
 
 #include <asm/mach-ath79/ath79.h>
 #include <asm/mach-ath79/ar71xx_regs.h>
@@ -194,8 +198,19 @@ unsigned int get_c0_compare_int(void)
 
 void __init plat_mem_setup(void)
 {
+        unsigned long fdt_start;
+
         set_io_port_base(KSEG1);
 
+        /* Get the position of the FDT passed by the bootloader */
+        fdt_start = fw_getenvl("fdt_start");
+        if (fdt_start)
+                __dt_setup_arch((void *)KSEG0ADDR(fdt_start));
+#ifdef CONFIG_BUILTIN_DTB
+        else
+                __dt_setup_arch(__dtb_start);
+#endif
+
         ath79_reset_base = ioremap_nocache(AR71XX_RESET_BASE,
                                            AR71XX_RESET_SIZE);
         ath79_pll_base = ioremap_nocache(AR71XX_PLL_BASE,
@@ -203,7 +218,8 @@ void __init plat_mem_setup(void)
         ath79_ddr_ctrl_init();
 
         ath79_detect_sys_type();
-        detect_memory_region(0, ATH79_MEM_SIZE_MIN, ATH79_MEM_SIZE_MAX);
+        if (mips_machtype != ATH79_MACH_GENERIC_OF)
+                detect_memory_region(0, ATH79_MEM_SIZE_MIN, ATH79_MEM_SIZE_MAX);
 
         _machine_restart = ath79_restart;
         _machine_halt = ath79_halt;
@@ -235,6 +251,10 @@ void __init plat_time_init(void)
 
 static int __init ath79_setup(void)
 {
+        of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
+        if  (mips_machtype == ATH79_MACH_GENERIC_OF)
+                return 0;
+
         ath79_gpio_init();
         ath79_register_uart();
         ath79_register_wdt();
@@ -246,6 +266,11 @@ static int __init ath79_setup(void)
 
 arch_initcall(ath79_setup);
 
+void __init device_tree_init(void)
+{
+        unflatten_and_copy_device_tree();
+}
+
 static void __init ath79_generic_init(void)
 {
         /* Nothing to do */