You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
72 lines
2.1 KiB
72 lines
2.1 KiB
12 years ago
|
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)
|