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MIPS: Ingenic: Disable abandoned HPTLB function.

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JZ4760/JZ4770/JZ4775/X1000/X1500 has an abandoned huge page tlb,
this mode is not compatible with the MIPS standard, it will cause
tlbmiss and into an infinite loop (line 21 in the tlb-funcs.S)
when starting the init process. write 0xa9000000 to cp0 register 5
sel 4 to disable this function to prevent getting stuck. Confirmed
by Ingenic, this operation will not adversely affect processors
without HPTLB function.

Signed-off-by: Zhou Yanjie <zhouyanjie@zoho.com>
Acked-by: Paul Cercueil <paul@crapouillou.net>
Signed-off-by: Paul Burton <paulburton@kernel.org>
Cc: linux-mips@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: ralf@linux-mips.org
Cc: jhogan@kernel.org
Cc: jiaxun.yang@flygoat.com
Cc: gregkh@linuxfoundation.org
Cc: malat@debian.org
Cc: tglx@linutronix.de
Cc: chenhc@lemote.com
This commit is contained in:
Zhou Yanjie 2019-11-19 22:28:47 +08:00 committed by Paul Burton
parent 37640adbef
commit b02efeb056
No known key found for this signature in database
GPG key ID: 3EA79FACB57500DD
2 changed files with 25 additions and 2 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

6
arch/mips/include/asm/mipsregs.h
View file

@ -689,6 +689,9 @@
#define MIPS_CONF7_IAR (_ULCAST_(1) << 10)
#define MIPS_CONF7_AR (_ULCAST_(1) << 16)
/* Ingenic HPTLB off bits */
#define XBURST_PAGECTRL_HPTLB_DIS 0xa9000000
/* Ingenic Config7 bits */
#define MIPS_CONF7_BTB_LOOP_EN (_ULCAST_(1) << 4)
@ -1971,6 +1974,9 @@ do { \
#define read_c0_brcm_sleepcount() __read_32bit_c0_register($22, 7)
#define write_c0_brcm_sleepcount(val) __write_32bit_c0_register($22, 7, val)
/* Ingenic page ctrl register */
#define write_c0_page_ctrl(val) __write_32bit_c0_register($5, 4, val)
/*
* Macros to access the guest system control coprocessor
*/

21
arch/mips/kernel/cpu-probe.c
View file

@ -1977,13 +1977,30 @@ static inline void cpu_probe_ingenic(struct cpuinfo_mips *c, unsigned int cpu)
break;
}
switch (c->processor_id & PRID_COMP_MASK) {
/*
* The config0 register in the Xburst CPUs with a processor ID of
* The config0 register in the XBurst CPUs with a processor ID of
* PRID_COMP_INGENIC_D1 has an abandoned huge page tlb mode, this
* mode is not compatible with the MIPS standard, it will cause
* tlbmiss and into an infinite loop (line 21 in the tlb-funcs.S)
* when starting the init process. After chip reset, the default
* is HPTLB mode, Write 0xa9000000 to cp0 register 5 sel 4 to
* switch back to VTLB mode to prevent getting stuck.
*/
case PRID_COMP_INGENIC_D1:
write_c0_page_ctrl(XBURST_PAGECTRL_HPTLB_DIS);
break;
/*
* The config0 register in the XBurst CPUs with a processor ID of
* PRID_COMP_INGENIC_D0 report themselves as MIPS32r2 compatible,
* but they don't actually support this ISA.
*/
if ((c->processor_id & PRID_COMP_MASK) == PRID_COMP_INGENIC_D0)
case PRID_COMP_INGENIC_D0:
c->isa_level &= ~MIPS_CPU_ISA_M32R2;
break;
default:
break;
}
}
static inline void cpu_probe_netlogic(struct cpuinfo_mips *c, int cpu)