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authorFlorian Fainelli <florian@openwrt.org>2013-06-26 18:11:56 +0000
committerRalf Baechle <ralf@linux-mips.org>2013-07-01 15:10:57 +0200
commit4df715aaf566110bedb3751ed235a3bacdebbdde (patch)
treeda36cde86ad23e4bab0077e9528959a2bc93f293 /arch/mips/kernel
parent3ddc14add5e6341cf8ef4058c34c67ba7fd15317 (diff)
MIPS: BMIPS: support booting from physical CPU other than 0
BMIPS43xx CPUs have two hardware threads, and on some SoCs such as 3368, the bootloader has configured the system to boot from TP1 instead of the more usual TP0. Create the physical to logical CPU mapping to cope with that, do not remap the software interrupts to be cross CPUs such that we do not have to do use the logical CPU mapping further down the code, and finally, reset the slave TP1 only if booted from TP0. Signed-off-by: Jonas Gorski <jogo@openwrt.org> Signed-off-by: Florian Fainelli <florian@openwrt.org> Cc: linux-mips@linux-mips.org Cc: blogic@openwrt.org Cc: cernekee@gmail.com Patchwork: https://patchwork.linux-mips.org/patch/5553/ Patchwork: https://patchwork.linux-mips.org/patch/5556/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/kernel')
-rw-r--r--arch/mips/kernel/smp-bmips.c29
1 files changed, 23 insertions, 6 deletions
diff --git a/arch/mips/kernel/smp-bmips.c b/arch/mips/kernel/smp-bmips.c
index 8e393b8443f7..aea6c0885838 100644
--- a/arch/mips/kernel/smp-bmips.c
+++ b/arch/mips/kernel/smp-bmips.c
@@ -63,7 +63,7 @@ static irqreturn_t bmips_ipi_interrupt(int irq, void *dev_id);
static void __init bmips_smp_setup(void)
{
- int i;
+ int i, cpu = 1, boot_cpu = 0;
#if defined(CONFIG_CPU_BMIPS4350) || defined(CONFIG_CPU_BMIPS4380)
/* arbitration priority */
@@ -72,13 +72,22 @@ static void __init bmips_smp_setup(void)
/* NBK and weak order flags */
set_c0_brcm_config_0(0x30000);
+ /* Find out if we are running on TP0 or TP1 */
+ boot_cpu = !!(read_c0_brcm_cmt_local() & (1 << 31));
+
/*
* MIPS interrupts 0,1 (SW INT 0,1) cross over to the other thread
* MIPS interrupt 2 (HW INT 0) is the CPU0 L1 controller output
* MIPS interrupt 3 (HW INT 1) is the CPU1 L1 controller output
+ *
+ * If booting from TP1, leave the existing CMT interrupt routing
+ * such that TP0 responds to SW1 and TP1 responds to SW0.
*/
- change_c0_brcm_cmt_intr(0xf8018000,
- (0x02 << 27) | (0x03 << 15));
+ if (boot_cpu == 0)
+ change_c0_brcm_cmt_intr(0xf8018000,
+ (0x02 << 27) | (0x03 << 15));
+ else
+ change_c0_brcm_cmt_intr(0xf8018000, (0x1d << 27));
/* single core, 2 threads (2 pipelines) */
max_cpus = 2;
@@ -106,9 +115,15 @@ static void __init bmips_smp_setup(void)
if (!board_ebase_setup)
board_ebase_setup = &bmips_ebase_setup;
+ __cpu_number_map[boot_cpu] = 0;
+ __cpu_logical_map[0] = boot_cpu;
+
for (i = 0; i < max_cpus; i++) {
- __cpu_number_map[i] = 1;
- __cpu_logical_map[i] = 1;
+ if (i != boot_cpu) {
+ __cpu_number_map[i] = cpu;
+ __cpu_logical_map[cpu] = i;
+ cpu++;
+ }
set_cpu_possible(i, 1);
set_cpu_present(i, 1);
}
@@ -157,7 +172,9 @@ static void bmips_boot_secondary(int cpu, struct task_struct *idle)
bmips_send_ipi_single(cpu, 0);
else {
#if defined(CONFIG_CPU_BMIPS4350) || defined(CONFIG_CPU_BMIPS4380)
- set_c0_brcm_cmt_ctrl(0x01);
+ /* Reset slave TP1 if booting from TP0 */
+ if (cpu_logical_map(cpu) == 0)
+ set_c0_brcm_cmt_ctrl(0x01);
#elif defined(CONFIG_CPU_BMIPS5000)
if (cpu & 0x01)
write_c0_brcm_action(ACTION_BOOT_THREAD(cpu));