MIPS: Netlogic: Read memory from DRAM BARs

Read the memory from the Bridge DRAM BARs, if it is not passed in
from the device tree. This will allow us to remove memory configuration
from built in device trees.

Signed-off-by: Jayachandran C <jchandra@broadcom.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/5743/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 23 insertions, 0 deletions

diff --git a/arch/mips/netlogic/xlp/setup.c b/arch/mips/netlogic/xlp/setup.c
index 7b638f7be491..7718368e4598 100644
--- a/arch/mips/netlogic/xlp/setup.c
+++ b/arch/mips/netlogic/xlp/setup.c
@@ -73,6 +73,23 @@ static void nlm_fixup_mem(void)
         }
 }
 
+static void __init xlp_init_mem_from_bars(void)
+{
+        uint64_t map[16];
+        int i, n;
+
+        n = xlp_get_dram_map(-1, map);  /* -1: info for all nodes */
+        for (i = 0; i < n; i += 2) {
+                /* exclude 0x1000_0000-0x2000_0000, u-boot device */
+                if (map[i] <= 0x10000000 && map[i+1] > 0x10000000)
+                        map[i+1] = 0x10000000;
+                if (map[i] > 0x10000000 && map[i] < 0x20000000)
+                        map[i] = 0x20000000;
+
+                add_memory_region(map[i], map[i+1] - map[i], BOOT_MEM_RAM);
+        }
+}
+
 void __init plat_mem_setup(void)
 {
         panic_timeout   = 5;
@@ -82,6 +99,12 @@ void __init plat_mem_setup(void)
 
         /* memory and bootargs from DT */
         early_init_devtree(initial_boot_params);
+
+        if (boot_mem_map.nr_map == 0) {
+                pr_info("Using DRAM BARs for memory map.\n");
+                xlp_init_mem_from_bars();
+        }
+        /* Calculate and setup wired entries for mapped kernel */
         nlm_fixup_mem();
 }