6.10-stable review patch. If anyone has any objections, please let me know.
------------------
From: Gregory CLEMENT <gregory.clement@xxxxxxxxxxx>
[ Upstream commit a263e5f309f32301e1f3ad113293f4e68a82a646 ]
When the CM block migrated from CM2.5 to CM3.0, the address offset for
the Global CSR Access Privilege register was modified. We saw this in
the "MIPS64 I6500 Multiprocessing System Programmer's Guide," it is
stated that "the Global CSR Access Privilege register is located at
offset 0x0120" in section 5.4. It is at least the same for I6400.
This fix allows to use the VP cores in SMP mode if the reset values
were modified by the bootloader.
Based on the work of Vladimir Kondratiev
<vladimir.kondratiev@xxxxxxxxxxxx> and the feedback from Jiaxun Yang
<jiaxun.yang@xxxxxxxxxxx>.
Fixes: 197e89e0984a ("MIPS: mips-cm: Implement mips_cm_revision")
Signed-off-by: Gregory CLEMENT <gregory.clement@xxxxxxxxxxx>
Reviewed-by: Jiaxun Yang <jiaxun.yang@xxxxxxxxxxx>
Signed-off-by: Thomas Bogendoerfer <tsbogend@xxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
arch/mips/include/asm/mips-cm.h | 4 ++++
arch/mips/kernel/smp-cps.c | 5 ++++-
2 files changed, 8 insertions(+), 1 deletion(-)
diff --git a/arch/mips/include/asm/mips-cm.h b/arch/mips/include/asm/mips-cm.h
index c2930a75b7e44..1e782275850a3 100644
--- a/arch/mips/include/asm/mips-cm.h
+++ b/arch/mips/include/asm/mips-cm.h
@@ -240,6 +240,10 @@ GCR_ACCESSOR_RO(32, 0x0d0, gic_status)
GCR_ACCESSOR_RO(32, 0x0f0, cpc_status)
#define CM_GCR_CPC_STATUS_EX BIT(0)
+/* GCR_ACCESS - Controls core/IOCU access to GCRs */
+GCR_ACCESSOR_RW(32, 0x120, access_cm3)
+#define CM_GCR_ACCESS_ACCESSEN GENMASK(7, 0)
+
/* GCR_L2_CONFIG - Indicates L2 cache configuration when Config5.L2C=1 */
GCR_ACCESSOR_RW(32, 0x130, l2_config)
#define CM_GCR_L2_CONFIG_BYPASS BIT(20)
diff --git a/arch/mips/kernel/smp-cps.c b/arch/mips/kernel/smp-cps.c
index 9cc087dd1c194..395622c373258 100644
--- a/arch/mips/kernel/smp-cps.c
+++ b/arch/mips/kernel/smp-cps.c
@@ -317,7 +317,10 @@ static void boot_core(unsigned int core, unsigned int vpe_id)
write_gcr_co_reset_ext_base(CM_GCR_Cx_RESET_EXT_BASE_UEB);
/* Ensure the core can access the GCRs */
- set_gcr_access(1 << core);
+ if (mips_cm_revision() < CM_REV_CM3)
+ set_gcr_access(1 << core);
+ else
+ set_gcr_access_cm3(1 << core);
if (mips_cpc_present()) {
/* Reset the core */
--
2.43.0
