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From 7c44eabf20cba12049bf9eebfa192afcc2053b2d Mon Sep 17 00:00:00 2001
From: Kevin Cernekee <cernekee@gmail.com>
Date: Sat, 9 Jul 2011 12:15:06 -0700
Subject: [PATCH V2 1/2] 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.org: moved SMP ops registration into ifdef guard,
changed ifdef guards to if (IS_ENABLED())]
Signed-off-by: Jonas Gorski <jogo@openwrt.org>
---
V1 -> V2:
* changed ifdef guards to if (IS_ENABLED())
arch/mips/bcm63xx/prom.c | 41 +++++++++++++++++++++++++++++++++++++++++
1 file changed, 41 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>
@@ -54,6 +58,43 @@ void __init prom_init(void)
/* do low level board init */
board_prom_init();
+
+ if (IS_ENABLED(CONFIG_CPU_BMIPS4350) && IS_ENABLED(CONFIG_SMP)) {
+ /* set up SMP */
+ register_smp_ops(&bmips_smp_ops);
+
+ /*
+ * BCM6328 might not have its second CPU enabled, while BCM6358
+ * needs special handling for its shared TLB, so disable SMP
+ * for now.
+ */
+ if (BCMCPU_IS_6328()) {
+ bmips_smp_enabled = 0;
+ } else if (BCMCPU_IS_6358()) {
+ bmips_smp_enabled = 0;
+ }
+
+ if (!bmips_smp_enabled)
+ 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
+ */
+ }
}
void __init prom_free_prom_memory(void)
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