82 lines
2.3 KiB
Diff
82 lines
2.3 KiB
Diff
From 7c44eabf20cba12049bf9eebfa192afcc2053b2d Mon Sep 17 00:00:00 2001
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From: Kevin Cernekee <cernekee@gmail.com>
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Date: Sat, 9 Jul 2011 12:15:06 -0700
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Subject: [PATCH V2 1/2] MIPS: BCM63XX: Add SMP support to prom.c
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This involves two changes to the BSP code:
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1) register_smp_ops() for BMIPS SMP
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2) The CPU1 boot vector on some of the BCM63xx platforms conflicts with
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the special interrupt vector (IV). Move it to 0x8000_0380 at boot time,
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to resolve the conflict.
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Signed-off-by: Kevin Cernekee <cernekee@gmail.com>
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[jogo@openwrt.org: moved SMP ops registration into ifdef guard,
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changed ifdef guards to if (IS_ENABLED())]
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Signed-off-by: Jonas Gorski <jogo@openwrt.org>
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---
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V1 -> V2:
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* changed ifdef guards to if (IS_ENABLED())
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arch/mips/bcm63xx/prom.c | 41 +++++++++++++++++++++++++++++++++++++++++
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1 file changed, 41 insertions(+)
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--- a/arch/mips/bcm63xx/prom.c
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+++ b/arch/mips/bcm63xx/prom.c
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@@ -8,7 +8,11 @@
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#include <linux/init.h>
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#include <linux/bootmem.h>
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+#include <linux/smp.h>
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#include <asm/bootinfo.h>
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+#include <asm/bmips.h>
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+#include <asm/smp-ops.h>
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+#include <asm/mipsregs.h>
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#include <bcm63xx_board.h>
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#include <bcm63xx_cpu.h>
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#include <bcm63xx_io.h>
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@@ -54,6 +58,43 @@ void __init prom_init(void)
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/* do low level board init */
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board_prom_init();
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+
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+ if (IS_ENABLED(CONFIG_CPU_BMIPS4350) && IS_ENABLED(CONFIG_SMP)) {
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+ /* set up SMP */
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+ register_smp_ops(&bmips_smp_ops);
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+
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+ /*
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+ * BCM6328 might not have its second CPU enabled, while BCM6358
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+ * needs special handling for its shared TLB, so disable SMP
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+ * for now.
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+ */
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+ if (BCMCPU_IS_6328()) {
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+ bmips_smp_enabled = 0;
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+ } else if (BCMCPU_IS_6358()) {
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+ bmips_smp_enabled = 0;
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+ }
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+
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+ if (!bmips_smp_enabled)
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+ return;
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+
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+ /*
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+ * The bootloader has set up the CPU1 reset vector at
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+ * 0xa000_0200.
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+ * This conflicts with the special interrupt vector (IV).
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+ * The bootloader has also set up CPU1 to respond to the wrong
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+ * IPI interrupt.
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+ * Here we will start up CPU1 in the background and ask it to
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+ * reconfigure itself then go back to sleep.
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+ */
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+ memcpy((void *)0xa0000200, &bmips_smp_movevec, 0x20);
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+ __sync();
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+ set_c0_cause(C_SW0);
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+ cpumask_set_cpu(1, &bmips_booted_mask);
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+
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+ /*
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+ * FIXME: we really should have some sort of hazard barrier here
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+ */
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+ }
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}
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void __init prom_free_prom_memory(void)
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