From 1266df887781c779deaf6d05eea2ef90a470cb34 Mon Sep 17 00:00:00 2001
From: Becky Bruce <becky.bruce@freescale.com>
Date: Mon, 3 Nov 2008 15:44:01 -0600
Subject: powerpc: change 86xx SMP boot method

We put the bootpg for the secondary cpus into memory and use
BPTR to get to it.  This is a step towards converting to the
ePAPR boot methodology.  Also, the code is written to
deal properly with more than 4GB of RAM.

Signed-off-by: Becky Bruce <becky.bruce@freescale.com>
---
 cpu/mpc86xx/mp.c | 68 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 68 insertions(+)
 create mode 100644 cpu/mpc86xx/mp.c

(limited to 'cpu/mpc86xx/mp.c')

diff --git a/cpu/mpc86xx/mp.c b/cpu/mpc86xx/mp.c
new file mode 100644
index 000000000..5014401dd
--- /dev/null
+++ b/cpu/mpc86xx/mp.c
@@ -0,0 +1,68 @@
+#include <common.h>
+#include <asm/processor.h>
+#include <asm/mmu.h>
+#include <ioports.h>
+#include <lmb.h>
+#include <asm/io.h>
+#include "mp.h"
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#if (CONFIG_NUM_CPUS > 1)
+void cpu_mp_lmb_reserve(struct lmb *lmb)
+{
+	u32 bootpg;
+
+	/* if we have 4G or more of memory, put the boot page at 4Gb-1M */
+	if ((u64)gd->ram_size > 0xfffff000)
+		bootpg = 0xfff00000;
+	else
+		bootpg = gd->ram_size - (1024 * 1024);
+
+	/* tell u-boot we stole a page */
+	lmb_reserve(lmb, bootpg, 4096);
+}
+
+/*
+ * Copy the code for other cpus to execute into an
+ * aligned location accessible via BPTR
+ */
+void setup_mp(void)
+{
+	extern ulong __secondary_start_page;
+	ulong fixup = (ulong)&__secondary_start_page;
+	u32 bootpg;
+	u32 bootpg_va;
+
+	/*
+	 * If we have 4G or more of memory, put the boot page at 4Gb-1M.
+	 * Otherwise, put it at the very end of RAM.
+	 */
+	if (gd->ram_size > 0xfffff000)
+		bootpg = 0xfff00000;
+	else
+		bootpg = gd->ram_size - (1024 * 1024);
+
+	if (bootpg >= CONFIG_SYS_MAX_DDR_BAT_SIZE) {
+		/* We're not covered by the DDR mapping, set up BAT  */
+		write_bat(DBAT7, CONFIG_SYS_SCRATCH_VA | BATU_BL_128K |
+			  BATU_VS | BATU_VP,
+			  bootpg | BATL_PP_RW | BATL_MEMCOHERENCE);
+		bootpg_va = CONFIG_SYS_SCRATCH_VA;
+	} else {
+		bootpg_va = bootpg;
+	}
+
+	memcpy((void *)bootpg_va, (void *)fixup, 4096);
+	flush_cache(bootpg_va, 4096);
+
+	/* remove the temporary BAT mapping */
+	if (bootpg >= CONFIG_SYS_MAX_DDR_BAT_SIZE)
+		write_bat(DBAT7, 0, 0);
+
+	/* If the physical location of bootpg is not at fff00000, set BPTR */
+	if (bootpg != 0xfff00000)
+		out_be32((uint *)(CONFIG_SYS_CCSRBAR + 0x20), 0x80000000 |
+			 (bootpg >> 12));
+}
+#endif
-- 
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