Re: [PATCH] MIPS: X1830: Add X1830 system type.
From: Zhou Yanjie
Date: Thu Nov 28 2019 - 00:18:18 EST
Hi Paul,
On 2019å11æ28æ 01:16, Paul Cercueil wrote:
Hi Zhou,
Le mar., nov. 26, 2019 at 14:17, Zhou Yanjie <zhouyanjie@xxxxxxxx> a
Ãcrit :
Add X1830 system type for cat /proc/cpuinfo to give out X1830.
Signed-off-by: Zhou Yanjie <zhouyanjie@xxxxxxxx>
---
arch/mips/include/asm/bootinfo.h | 1 +
arch/mips/include/asm/cpu.h | 5 ++--
arch/mips/jz4740/setup.c | 4 +++
arch/mips/kernel/cpu-probe.c | 65
++++++++++++++++++++++------------------
4 files changed, 44 insertions(+), 31 deletions(-)
diff --git a/arch/mips/include/asm/bootinfo.h
b/arch/mips/include/asm/bootinfo.h
index 34d6222..07f4cfe 100644
--- a/arch/mips/include/asm/bootinfo.h
+++ b/arch/mips/include/asm/bootinfo.h
@@ -82,6 +82,7 @@ enum loongson_machine_type {
#define MACH_INGENIC_JZ4770 2 /* JZ4770 SOC */
#define MACH_INGENIC_JZ4780 3 /* JZ4780 SOC */
#define MACH_INGENIC_X1000 4 /* X1000 SOC */
+#define MACH_INGENIC_X1830 5 /* X1830 SOC */
extern char *system_type;
const char *get_system_type(void);
diff --git a/arch/mips/include/asm/cpu.h b/arch/mips/include/asm/cpu.h
index 7fddcb8..fa7c1e8 100644
--- a/arch/mips/include/asm/cpu.h
+++ b/arch/mips/include/asm/cpu.h
@@ -46,7 +46,7 @@
#define PRID_COMP_NETLOGIC 0x0c0000
#define PRID_COMP_CAVIUM 0x0d0000
#define PRID_COMP_LOONGSON 0x140000
-#define PRID_COMP_INGENIC_D0 0xd00000 /* JZ4740, JZ4750 */
+#define PRID_COMP_INGENIC_D0 0xd00000 /* JZ4740, JZ4750, X1830 */
#define PRID_COMP_INGENIC_D1 0xd10000 /* JZ4770, JZ4775, X1000 */
#define PRID_COMP_INGENIC_E1 0xe10000 /* JZ4780 */
@@ -183,7 +183,8 @@
* These are the PRID's for when 23:16 == PRID_COMP_INGENIC_*
*/
-#define PRID_IMP_XBURST 0x0200
+#define PRID_IMP_XBURST_REV1 0x0200 /* XBurst with MXU SIMD
ISA */
+#define PRID_IMP_XBURST_REV2 0x0100 /* XBurst with MXU2 SIMD
ISA */
/*
* These are the PRID's for when 23:16 == PRID_COMP_NETLOGIC
diff --git a/arch/mips/jz4740/setup.c b/arch/mips/jz4740/setup.c
index dc8ee21..880c268 100644
--- a/arch/mips/jz4740/setup.c
+++ b/arch/mips/jz4740/setup.c
@@ -44,6 +44,8 @@ static void __init jz4740_detect_mem(void)
static unsigned long __init get_board_mach_type(const void *fdt)
{
+ if (!fdt_node_check_compatible(fdt, 0, "ingenic,x1830"))
+ return MACH_INGENIC_X1830;
if (!fdt_node_check_compatible(fdt, 0, "ingenic,x1000"))
return MACH_INGENIC_X1000;
if (!fdt_node_check_compatible(fdt, 0, "ingenic,jz4780"))
@@ -86,6 +88,8 @@ void __init device_tree_init(void)
const char *get_system_type(void)
{
switch (mips_machtype) {
+ case MACH_INGENIC_X1830:
+ return "X1830";
case MACH_INGENIC_X1000:
return "X1000";
case MACH_INGENIC_JZ4780:
diff --git a/arch/mips/kernel/cpu-probe.c b/arch/mips/kernel/cpu-probe.c
index 8abadfe..94b3cc5 100644
--- a/arch/mips/kernel/cpu-probe.c
+++ b/arch/mips/kernel/cpu-probe.c
@@ -1948,10 +1948,8 @@ static inline void cpu_probe_ingenic(struct
cpuinfo_mips *c, unsigned int cpu)
BUG_ON(!__builtin_constant_p(cpu_has_counter) || cpu_has_counter);
switch (c->processor_id & PRID_IMP_MASK) {
- case PRID_IMP_XBURST:
- c->cputype = CPU_XBURST;
- c->writecombine = _CACHE_UNCACHED_ACCELERATED;
- __cpu_name[cpu] = "Ingenic JZRISC";
+ case PRID_IMP_XBURST_REV1:
+
/*
* The XBurst core by default attempts to avoid branch target
* buffer lookups by detecting & special casing loops. This
@@ -1959,34 +1957,43 @@ static inline void cpu_probe_ingenic(struct
cpuinfo_mips *c, unsigned int cpu)
* Set cp0 config7 bit 4 to disable this feature.
*/
set_c0_config7(MIPS_CONF7_BTB_LOOP_EN);
- break;
- default:
- panic("Unknown Ingenic Processor ID!");
- break;
- }
- switch (c->processor_id & PRID_COMP_MASK) {
- /*
- * 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.
- */
- case PRID_COMP_INGENIC_D0:
- c->isa_level &= ~MIPS_CPU_ISA_M32R2;
+ switch (c->processor_id & PRID_COMP_MASK) {
+
+ /*
+ * 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.
+ */
+ case PRID_COMP_INGENIC_D0:
+ c->isa_level &= ~MIPS_CPU_ISA_M32R2;
+ break;
+
+ /*
+ * 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;
+
+ default:
+ break;
+ }
I see no "break" here. If that's intended, please add a /*
fall-through */ comment here. It will prevent GCC from issuing a
warning when -Wimplicit-fallthrough is used.
Sure, I will add it in v2.
+
+ case PRID_IMP_XBURST_REV2:
+ c->cputype = CPU_XBURST;
+ c->writecombine = _CACHE_UNCACHED_ACCELERATED;
+ __cpu_name[cpu] = "Ingenic XBurst";
The CPU name switched from "Ingenic JZRISC" to "Ingenic XBurst". If
that's intended (I believe it is) please mention it in the commit
message.
Ok, I will mention it in the commit message when I send v2.
Thanks and best regards!
Cheers,
-Paul
break;
+
default:
+ panic("Unknown Ingenic Processor ID!");
break;
}
}
--
2.7.4