bcm63xx: add SMP support for BCM6362 and BCM6368

BCM6358 requires further work due to its shared TLB.

Signed-off-by: Jonas Gorski <jogo@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@36526 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 71 insertions, 0 deletions

diff --git a/target/linux/brcm63xx/patches-3.8/310-BCM63XX-Add-SMP-support-to-prom.c.patch b/target/linux/brcm63xx/patches-3.8/310-BCM63XX-Add-SMP-support-to-prom.c.patch
new file mode 100644
index 000000000..7c9baf7e4
--- /dev/null
+++ b/target/linux/brcm63xx/patches-3.8/310-BCM63XX-Add-SMP-support-to-prom.c.patch
@@ -0,0 +1,71 @@
+From 10ea7fd6b854c3ecf745d053beba10c7e00c33c9 Mon Sep 17 00:00:00 2001
+From: Kevin Cernekee <cernekee@gmail.com>
+Date: Sat, 9 Jul 2011 12:15:06 -0700
+Subject: [PATCH 01/13] MIPS: BCM63XX: Add SMP support to prom.c
+
+This involves two changes to the BSP code:
+
+1) register_smp_ops() for BMIPS SMP
+
+2) The CPU1 boot vector on some of the BCM63xx platforms conflicts with
+the special interrupt vector (IV).  Move it to 0x8000_0380 at boot time,
+to resolve the conflict.
+
+Signed-off-by: Kevin Cernekee <cernekee@gmail.com>
+[jogo@openwrt: move smp ops registration below #ifdef guard, don't enable
+ smp for 6328/6358]
+Signed-off-by: Jonas Gorski <jogo@openwrt.org>
+---
+ arch/mips/bcm63xx/prom.c |   33 +++++++++++++++++++++++++++++++++
+ 1 file changed, 33 insertions(+)
+
+--- a/arch/mips/bcm63xx/prom.c
++++ b/arch/mips/bcm63xx/prom.c
+@@ -8,7 +8,11 @@
+ 
+ #include <linux/init.h>
+ #include <linux/bootmem.h>
++#include <linux/smp.h>
+ #include <asm/bootinfo.h>
++#include <asm/bmips.h>
++#include <asm/smp-ops.h>
++#include <asm/mipsregs.h>
+ #include <bcm63xx_board.h>
+ #include <bcm63xx_cpu.h>
+ #include <bcm63xx_io.h>
+@@ -52,6 +56,35 @@ void __init prom_init(void)
+ 
+ 	/* do low level board init */
+ 	board_prom_init();
++
++#if defined(CONFIG_CPU_BMIPS4350) && defined(CONFIG_SMP)
++	/* set up SMP */
++	register_smp_ops(&bmips_smp_ops);
++
++	/*
++	 * BCM6328 does not have its second CPU enabled, while BCM6358
++	 * needs special handling for its shared TLB, so disable SMP for now.
++	 */
++	if (BCMCPU_IS_6328() || BCMCPU_IS_6358()) {
++		bmips_smp_enabled = 0;
++		return;
++	}
++
++	/*
++	 * The bootloader has set up the CPU1 reset vector at 0xa000_0200.
++	 * This conflicts with the special interrupt vector (IV).
++	 * The bootloader has also set up CPU1 to respond to the wrong
++	 * IPI interrupt.
++	 * Here we will start up CPU1 in the background and ask it to
++	 * reconfigure itself then go back to sleep.
++	 */
++	memcpy((void *)0xa0000200, &bmips_smp_movevec, 0x20);
++	__sync();
++	set_c0_cause(C_SW0);
++	cpumask_set_cpu(1, &bmips_booted_mask);
++
++	/* FIXME: we really should have some sort of hazard barrier here */
++#endif
+ }
+ 
+ void __init prom_free_prom_memory(void)