[POWERPC] Add early debug console for CPM serial ports.

This code assumes that the ports have been previously set up, with
buffers in DPRAM.

Signed-off-by: Scott Wood <scottwood@freescale.com>
Acked-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

1 files changed, 16 insertions, 0 deletions

diff --git a/arch/powerpc/kernel/head_32.S b/arch/powerpc/kernel/head_32.S
index c86c626cf156..d83f04e5a599 100644
--- a/arch/powerpc/kernel/head_32.S
+++ b/arch/powerpc/kernel/head_32.S
@@ -149,6 +149,9 @@ __after_mmu_off:
 #if defined(CONFIG_BOOTX_TEXT)
         bl      setup_disp_bat
 #endif
+#ifdef CONFIG_PPC_EARLY_DEBUG_CPM
+        bl      setup_cpm_bat
+#endif
 
 /*
  * Call setup_cpu for CPU 0 and initialize 6xx Idle
@@ -1245,6 +1248,19 @@ setup_disp_bat:
         blr
 #endif /* CONFIG_BOOTX_TEXT */
 
+#ifdef CONFIG_PPC_EARLY_DEBUG_CPM
+setup_cpm_bat:
+        lis     r8, 0xf000
+        ori     r8, r8, 0x002a
+        mtspr   SPRN_DBAT1L, r8
+
+        lis     r11, 0xf000
+        ori     r11, r11, (BL_1M << 2) | 2
+        mtspr   SPRN_DBAT1U, r11
+
+        blr
+#endif
+
 #ifdef CONFIG_8260
 /* Jump into the system reset for the rom.
  * We first disable the MMU, and then jump to the ROM reset address.