ARC: Improve identification of ARC cores
1. Try to guess a ARC core template that was used
i.e. not just name a core family but something more
menaingful like "ARC HS38", "ARC EM11D" etc.
We do it checking availability of the key differentiation
features like:
- Caches (we actually only check for L1 I$ fpr simplicity)
- XY-memory
- DSP extensions etc.
2. Identify ARC subsystems
3. Print core clock frequency
Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
diff --git a/arch/arc/include/asm/arcregs.h b/arch/arc/include/asm/arcregs.h
index 9920d2e..fff6591 100644
--- a/arch/arc/include/asm/arcregs.h
+++ b/arch/arc/include/asm/arcregs.h
@@ -16,6 +16,20 @@
* access: "lr"/"sr".
*/
+/*
+ * Typically 8 least significant bits of Build Configuration Register (BCR)
+ * describe version of the HW block in question. Moreover if decoded version
+ * is 0 this means given HW block is absent - this is especially useful because
+ * we may safely read BRC regardless HW block existence while an attempt to
+ * access any other AUX regs associated with this HW block lead to imediate
+ * "instruction error" exception.
+ *
+ * I.e. before using any cofigurable HW block it's required to make sure it
+ * exists at all, and for that we introduce a special macro below.
+ */
+#define ARC_BCR_VERSION_MASK GENMASK(7, 0)
+#define ARC_FEATURE_EXISTS(bcr) !!(__builtin_arc_lr(bcr) & ARC_BCR_VERSION_MASK)
+
#define ARC_AUX_IDENTITY 0x04
#define ARC_AUX_STATUS32 0x0a
@@ -73,7 +87,7 @@
#define ARC_BCR_CLUSTER 0xcf
/* MMU Management regs */
-#define ARC_AUX_MMU_BCR 0x06f
+#define ARC_AUX_MMU_BCR 0x6f
/* IO coherency related auxiliary registers */
#define ARC_AUX_IO_COH_ENABLE 0x500
@@ -81,6 +95,15 @@
#define ARC_AUX_IO_COH_AP0_BASE 0x508
#define ARC_AUX_IO_COH_AP0_SIZE 0x509
+/* XY-memory related */
+#define ARC_AUX_XY_BUILD 0x79
+
+/* DSP-extensions related auxiliary registers */
+#define ARC_AUX_DSP_BUILD 0x7A
+
+/* ARC Subsystems related auxiliary registers */
+#define ARC_AUX_SUBSYS_BUILD 0xF0
+
#ifndef __ASSEMBLY__
/* Accessors for auxiliary registers */
#define read_aux_reg(reg) __builtin_arc_lr(reg)
diff --git a/arch/arc/lib/cpu.c b/arch/arc/lib/cpu.c
index a969a16..07daaa8 100644
--- a/arch/arc/lib/cpu.c
+++ b/arch/arc/lib/cpu.c
@@ -4,6 +4,7 @@
*/
#include <common.h>
+#include <malloc.h>
#include <asm/arcregs.h>
#include <asm/cache.h>
@@ -35,34 +36,193 @@
}
#ifdef CONFIG_DISPLAY_CPUINFO
-const char *decode_identity(void)
+const char *arc_700_version(int arcver, char *name, int name_len)
{
- int arcver = read_aux_reg(ARC_AUX_IDENTITY) & 0xff;
+ const char *arc_ver;
switch (arcver) {
- /* ARCompact cores */
- case 0x32: return "ARC 700 v4.4-4.5";
- case 0x33: return "ARC 700 v4.6-v4.9";
- case 0x34: return "ARC 700 v4.10";
- case 0x35: return "ARC 700 v4.11";
-
- /* ARCv2 cores */
- case 0x41: return "ARC EM v1.1a";
- case 0x42: return "ARC EM v3.0";
- case 0x43: return "ARC EM v4.0";
- case 0x50: return "ARC HS v1.0";
- case 0x51: return "ARC EM v2.0";
- case 0x52: return "ARC EM v2.1";
- case 0x53: return "ARC HS v3.0";
- case 0x54: return "ARC HS v4.0";
-
- default: return "Unknown ARC core";
+ case 0x32:
+ arc_ver = "v4.4-4.5";
+ break;
+ case 0x33:
+ arc_ver = "v4.6-v4.9";
+ break;
+ case 0x34:
+ arc_ver = "v4.10";
+ break;
+ case 0x35:
+ arc_ver = "v4.11";
+ break;
+ default:
+ arc_ver = "unknown version";
}
+
+ snprintf(name, name_len, "ARC 700 %s", arc_ver);
+
+ return name;
+}
+
+struct em_template_t {
+ const bool cache;
+ const bool dsp;
+ const bool xymem;
+ const char name[8];
+};
+
+static const struct em_template_t em_versions[] = {
+ {false, false, false, "EM4"},
+ {true, false, false, "EM6"},
+ {false, true, false, "EM5D"},
+ {true, true, false, "EM7D"},
+ {false, true, true, "EM9D"},
+ {true, true, true, "EM11D"},
+};
+
+const char *arc_em_version(int arcver, char *name, int name_len)
+{
+ const char *arc_name = "EM";
+ const char *arc_ver;
+ bool cache = ARC_FEATURE_EXISTS(ARC_BCR_IC_BUILD);
+ bool dsp = ARC_FEATURE_EXISTS(ARC_AUX_DSP_BUILD);
+ bool xymem = ARC_FEATURE_EXISTS(ARC_AUX_XY_BUILD);
+ int i;
+
+ for (i = 0; i++ < sizeof(em_versions) / sizeof(struct em_template_t);) {
+ if (em_versions[i].cache == cache &&
+ em_versions[i].dsp == dsp &&
+ em_versions[i].xymem == xymem) {
+ arc_name = em_versions[i].name;
+ break;
+ }
+ }
+
+ switch (arcver) {
+ case 0x41:
+ arc_ver = "v1.1a";
+ break;
+ case 0x42:
+ arc_ver = "v3.0";
+ break;
+ case 0x43:
+ arc_ver = "v4.0";
+ break;
+ case 0x44:
+ arc_ver = "v5.0";
+ break;
+ default:
+ arc_ver = "unknown version";
+ }
+
+ snprintf(name, name_len, "ARC %s %s", arc_name, arc_ver);
+
+ return name;
+}
+
+struct hs_template_t {
+ const bool cache;
+ const bool mmu;
+ const bool dual_issue;
+ const bool dsp;
+ const char name[8];
+};
+
+static const struct hs_template_t hs_versions[] = {
+ {false, false, false, false, "HS34"},
+ {true, false, false, false, "HS36"},
+ {true, true, false, false, "HS38"},
+ {false, false, true, false, "HS44"},
+ {true, false, true, false, "HS46"},
+ {true, true, true, false, "HS48"},
+ {false, false, true, true, "HS45D"},
+ {true, false, true, true, "HS47D"},
+};
+
+const char *arc_hs_version(int arcver, char *name, int name_len)
+{
+ const char *arc_name = "HS";
+ const char *arc_ver;
+ bool cache = ARC_FEATURE_EXISTS(ARC_BCR_IC_BUILD);
+ bool dsp = ARC_FEATURE_EXISTS(ARC_AUX_DSP_BUILD);
+ bool mmu = !!read_aux_reg(ARC_AUX_MMU_BCR);
+ bool dual_issue = arcver == 0x54 ? true : false;
+ int i;
+
+ for (i = 0; i++ < sizeof(hs_versions) / sizeof(struct hs_template_t);) {
+ if (hs_versions[i].cache == cache &&
+ hs_versions[i].mmu == mmu &&
+ hs_versions[i].dual_issue == dual_issue &&
+ hs_versions[i].dsp == dsp) {
+ arc_name = hs_versions[i].name;
+ break;
+ }
+ }
+
+ switch (arcver) {
+ case 0x50:
+ arc_ver = "v1.0";
+ break;
+ case 0x51:
+ arc_ver = "v2.0";
+ break;
+ case 0x52:
+ arc_ver = "v2.1c";
+ break;
+ case 0x53:
+ arc_ver = "v3.0";
+ break;
+ case 0x54:
+ arc_ver = "v4.0";
+ break;
+ default:
+ arc_ver = "unknown version";
+ }
+
+ snprintf(name, name_len, "ARC %s %s", arc_name, arc_ver);
+
+ return name;
+}
+
+const char *decode_identity(void)
+{
+#define MAX_CPU_NAME_LEN 64
+
+ int arcver = read_aux_reg(ARC_AUX_IDENTITY) & 0xff;
+ char *name = malloc(MAX_CPU_NAME_LEN);
+
+ if (arcver >= 0x50)
+ return arc_hs_version(arcver, name, MAX_CPU_NAME_LEN);
+ else if (arcver >= 0x40)
+ return arc_em_version(arcver, name, MAX_CPU_NAME_LEN);
+ else if (arcver >= 0x30)
+ return arc_700_version(arcver, name, MAX_CPU_NAME_LEN);
+ else
+ return "Unknown ARC core";
+}
+
+const char *decode_subsystem(void)
+{
+ int subsys_type = read_aux_reg(ARC_AUX_SUBSYS_BUILD) & GENMASK(3, 0);
+
+ switch (subsys_type) {
+ case 0: return NULL;
+ case 2: return "ARC Sensor & Control IP Subsystem";
+ case 3: return "ARC Data Fusion IP Subsystem";
+ case 4: return "ARC Secure Subsystem";
+ default: return "Unknown subsystem";
+ };
}
__weak int print_cpuinfo(void)
{
- printf("CPU: %s\n", decode_identity());
+ const char *subsys_name = decode_subsystem();
+ char mhz[8];
+
+ printf("CPU: %s at %s MHz\n", decode_identity(),
+ strmhz(mhz, gd->cpu_clk));
+
+ if (subsys_name)
+ printf("Subsys:%s\n", subsys_name);
+
return 0;
}
#endif /* CONFIG_DISPLAY_CPUINFO */