3 files changed, 34 insertions, 24 deletions

diff --git a/arch/arc/include/asm/arcregs.h b/arch/arc/include/asm/arcregs.h
index b8d29b136b96..7f3f9f63708c 100644
--- a/arch/arc/include/asm/arcregs.h
+++ b/arch/arc/include/asm/arcregs.h
@@ -349,7 +349,7 @@ struct cpuinfo_arc {
         struct cpuinfo_arc_bpu bpu;
         struct bcr_identity core;
         struct bcr_isa isa;
-        const char *details;
+        const char *details, *name;
         unsigned int vec_base;
         struct cpuinfo_arc_ccm iccm, dccm;
         struct {
diff --git a/arch/arc/include/asm/setup.h b/arch/arc/include/asm/setup.h
index bdc43df922c9..cb954cdab070 100644
--- a/arch/arc/include/asm/setup.h
+++ b/arch/arc/include/asm/setup.h
@@ -27,11 +27,6 @@ struct id_to_str {
         const char *str;
 };
 
-struct cpuinfo_data {
-        struct id_to_str info;
-        int up_range;
-};
-
 extern int root_mountflags, end_mem;
 
 void setup_processor(void);
diff --git a/arch/arc/kernel/setup.c b/arch/arc/kernel/setup.c
index 156981aecd74..0385df77a697 100644
--- a/arch/arc/kernel/setup.c
+++ b/arch/arc/kernel/setup.c
@@ -40,18 +40,27 @@ struct task_struct *_current_task[NR_CPUS];	/* For stack switching */
 
 struct cpuinfo_arc cpuinfo_arc700[NR_CPUS];
 
-static const struct cpuinfo_data arc_cpu_tbl[] = {
+static const struct id_to_str arc_cpu_rel[] = {
 #ifdef CONFIG_ISA_ARCOMPACT
-        { {0x20, "ARC 600"      }, 0x2F},
-        { {0x30, "ARC 700"      }, 0x33},
-        { {0x34, "ARC 700 R4.10"}, 0x34},
-        { {0x35, "ARC 700 R4.11"}, 0x35},
+        { 0x34, "R4.10"},
+        { 0x35, "R4.11"},
 #else
-        { {0x50, "ARC HS38 R2.0"}, 0x51},
-        { {0x52, "ARC HS38 R2.1"}, 0x52},
-        { {0x53, "ARC HS38 R3.0"}, 0x53},
+        { 0x51, "R2.0" },
+        { 0x52, "R2.1" },
+        { 0x53, "R3.0" },
 #endif
-        { {0x00, NULL           } }
+        { 0x00, NULL   }
+};
+
+static const struct id_to_str arc_cpu_nm[] = {
+#ifdef CONFIG_ISA_ARCOMPACT
+        { 0x20, "ARC 600"   },
+        { 0x30, "ARC 770"   },  /* 750 identified seperately */
+#else
+        { 0x40, "ARC EM"  },
+        { 0x50, "ARC HS38"  },
+#endif
+        { 0x00, "Unknown"   }
 };
 
 static void read_decode_ccm_bcr(struct cpuinfo_arc *cpu)
@@ -106,23 +115,25 @@ static void read_arc_build_cfg_regs(void)
         struct bcr_timer timer;
         struct bcr_generic bcr;
         struct cpuinfo_arc *cpu = &cpuinfo_arc700[smp_processor_id()];
-        const struct cpuinfo_data *tbl;
+        const struct id_to_str *tbl;
 
         FIX_PTR(cpu);
 
         READ_BCR(AUX_IDENTITY, cpu->core);
         READ_BCR(ARC_REG_ISA_CFG_BCR, cpu->isa);
 
-        for (tbl = &arc_cpu_tbl[0]; tbl->info.id != 0; tbl++) {
-                if ((cpu->core.family >= tbl->info.id) &&
-                    (cpu->core.family <= tbl->up_range)) {
-                        cpu->details = tbl->info.str;
+        for (tbl = &arc_cpu_rel[0]; tbl->id != 0; tbl++) {
+                if (cpu->core.family == tbl->id) {
+                        cpu->details = tbl->str;
                         break;
                 }
         }
 
-        if (tbl->info.id == 0)
-                cpu->details = "UNKNOWN";
+        for (tbl = &arc_cpu_nm[0]; tbl->id != 0; tbl++) {
+                if ((cpu->core.family & 0xF0) == tbl->id)
+                        break;
+        }
+        cpu->name = tbl->str;
 
         READ_BCR(ARC_REG_TIMERS_BCR, timer);
         cpu->extn.timer0 = timer.t0;
@@ -199,6 +210,10 @@ static void read_arc_build_cfg_regs(void)
                         cpu->isa.atomic = cpu->isa.atomic1;
 
                 cpu->isa.be = IS_ENABLED(CONFIG_CPU_BIG_ENDIAN);
+
+                 /* there's no direct way to distinguish 750 vs. 770 */
+                if (unlikely(cpu->core.family < 0x34 || cpu->mmu.ver < 3))
+                        cpu->name = "ARC750";
         }
 }
 
@@ -214,8 +229,8 @@ static char *arc_cpu_mumbojumbo(int cpu_id, char *buf, int len)
                        "\nIDENTITY\t: ARCVER [%#02x] ARCNUM [%#02x] CHIPID [%#4x]\n",
                        core->family, core->cpu_id, core->chip_id);
 
-        n += scnprintf(buf + n, len - n, "processor [%d]\t: %s (%s ISA) %s\n",
-                       cpu_id, cpu->details,
+        n += scnprintf(buf + n, len - n, "processor [%d]\t: %s %s (%s ISA) %s\n",
+                       cpu_id, cpu->name, cpu->details,
                        is_isa_arcompact() ? "ARCompact" : "ARCv2",
                        IS_AVAIL1(cpu->isa.be, "[Big-Endian]"));