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MIPS: BMIPS: fix slave CPU booting when physical CPU is not 0 

The current BMIPS SMP code assumes that the slave CPU is physical and
logical CPU 1, but on some systems such as BCM3368, the slave CPU is
physical CPU0. Fix the code to read the physical CPU (thread ID) we are
running this code on, and adjust the relocation vector address based on
it. This allows bringing up the second CPU on BCM3368 for instance.

Signed-off-by: Florian Fainelli <florian@openwrt.org>
Cc: linux-mips@linux-mips.org
Cc: cernekee@gmail.com
Cc: jogo@openwrt.org
Cc: blogic@openwrt.org
Patchwork: https://patchwork.linux-mips.org/patch/5621/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Florian Fainelli 2013-07-24 17:12:11 +01:00 committed by Ralf Baechle
parent c4091d3fbb
commit ff5fadaff3
2 changed files with 13 additions and 3 deletions
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6
arch/mips/kernel/bmips_vec.S
View File

@ -54,7 +54,11 @@ LEAF(bmips_smp_movevec)
/* set up CPU1 CBR; move BASE to 0xa000_0000 */
li k0, 0xff400000
mtc0 k0, $22, 6
li k1, CKSEG1 | BMIPS_RELO_VECTOR_CONTROL_1
/* set up relocation vector address based on thread ID */
mfc0 k1, $22, 3
srl k1, 16
andi k1, 0x8000
or k1, CKSEG1 | BMIPS_RELO_VECTOR_CONTROL_0
or k0, k1
li k1, 0xa0080000
sw k1, 0(k0)

10
arch/mips/kernel/smp-bmips.c
View File

@ -196,9 +196,15 @@ static void bmips_init_secondary(void)
#if defined(CONFIG_CPU_BMIPS4350) || defined(CONFIG_CPU_BMIPS4380)
void __iomem *cbr = BMIPS_GET_CBR();
unsigned long old_vec;
unsigned long relo_vector;
int boot_cpu;
old_vec = __raw_readl(cbr + BMIPS_RELO_VECTOR_CONTROL_1);
__raw_writel(old_vec & ~0x20000000, cbr + BMIPS_RELO_VECTOR_CONTROL_1);
boot_cpu = !!(read_c0_brcm_cmt_local() & (1 << 31));
relo_vector = boot_cpu ? BMIPS_RELO_VECTOR_CONTROL_0 :
BMIPS_RELO_VECTOR_CONTROL_1;
old_vec = __raw_readl(cbr + relo_vector);
__raw_writel(old_vec & ~0x20000000, cbr + relo_vector);
clear_c0_cause(smp_processor_id() ? C_SW1 : C_SW0);
#elif defined(CONFIG_CPU_BMIPS5000)