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-rw-r--r--arch/powerpc/cpu/ppc4xx/cpu_init.c64
-rw-r--r--arch/powerpc/include/asm/ppc405ex.h5
-rw-r--r--arch/powerpc/include/asm/processor.h31
3 files changed, 100 insertions, 0 deletions
diff --git a/arch/powerpc/cpu/ppc4xx/cpu_init.c b/arch/powerpc/cpu/ppc4xx/cpu_init.c
index bf208ad..970a8c1 100644
--- a/arch/powerpc/cpu/ppc4xx/cpu_init.c
+++ b/arch/powerpc/cpu/ppc4xx/cpu_init.c
@@ -221,6 +221,66 @@ void reconfigure_pll(u32 new_cpu_freq)
#endif
}
+#ifdef CONFIG_SYS_4xx_CHIP_21_ERRATA
+void
+chip_21_errata(void)
+{
+ /*
+ * See rev 1.09 of the 405EX/405EXr errata. CHIP_21 says that
+ * sometimes reading the PVR and/or SDR0_ECID results in incorrect
+ * values. Since the rev-D chip uses the SDR0_ECID bits to control
+ * internal features, that means the second PCIe or ethernet of an EX
+ * variant could fail to work. Also, security features of both EX and
+ * EXr might be incorrectly disabled.
+ *
+ * The suggested workaround is as follows (covering rev-C and rev-D):
+ *
+ * 1.Read the PVR and SDR0_ECID3.
+ *
+ * 2.If the PVR matches an expected Revision C PVR value AND if
+ * SDR0_ECID3[12:15] is different from PVR[28:31], then processor is
+ * Revision C: continue executing the initialization code (no reset
+ * required). else go to step 3.
+ *
+ * 3.If the PVR matches an expected Revision D PVR value AND if
+ * SDR0_ECID3[10:11] matches its expected value, then continue
+ * executing initialization code, no reset required. else write
+ * DBCR0[RST] = 0b11 to generate a SysReset.
+ */
+
+ u32 pvr;
+ u32 pvr_28_31;
+ u32 ecid3;
+ u32 ecid3_10_11;
+ u32 ecid3_12_15;
+
+ /* Step 1: */
+ pvr = get_pvr();
+ mfsdr(SDR0_ECID3, ecid3);
+
+ /* Step 2: */
+ pvr_28_31 = pvr & 0xf;
+ ecid3_10_11 = (ecid3 >> 20) & 0x3;
+ ecid3_12_15 = (ecid3 >> 16) & 0xf;
+ if ((pvr == CONFIG_405EX_CHIP21_PVR_REV_C) &&
+ (pvr_28_31 != ecid3_12_15)) {
+ /* No reset required. */
+ return;
+ }
+
+ /* Step 3: */
+ if ((pvr == CONFIG_405EX_CHIP21_PVR_REV_D) &&
+ (ecid3_10_11 == CONFIG_405EX_CHIP21_ECID3_REV_D)) {
+ /* No reset required. */
+ return;
+ }
+
+ /* Reset required. */
+ __asm__ __volatile__ ("sync; isync");
+ mtspr(SPRN_DBCR0, 0x30000000);
+}
+#endif
+
/*
* Breath some life into the CPU...
*
@@ -235,6 +295,10 @@ cpu_init_f (void)
u32 val;
#endif
+#ifdef CONFIG_SYS_4xx_CHIP_21_ERRATA
+ chip_21_errata();
+#endif
+
reconfigure_pll(CONFIG_SYS_PLL_RECONFIG);
#if (defined(CONFIG_405EP) || defined (CONFIG_405EX)) && \
diff --git a/arch/powerpc/include/asm/ppc405ex.h b/arch/powerpc/include/asm/ppc405ex.h
index 36d3149..8070385 100644
--- a/arch/powerpc/include/asm/ppc405ex.h
+++ b/arch/powerpc/include/asm/ppc405ex.h
@@ -43,6 +43,11 @@
#define SDR0_PFC1 0x4101
#define SDR0_MFR 0x4300 /* SDR0_MFR reg */
+#define SDR0_ECID0 0x0080
+#define SDR0_ECID1 0x0081
+#define SDR0_ECID2 0x0082
+#define SDR0_ECID3 0x0083
+
#define SDR0_SDCS_SDD (0x80000000 >> 31)
#define SDR0_SRST_DMC (0x80000000 >> 10)
diff --git a/arch/powerpc/include/asm/processor.h b/arch/powerpc/include/asm/processor.h
index f5bf4dd..c5b03b4 100644
--- a/arch/powerpc/include/asm/processor.h
+++ b/arch/powerpc/include/asm/processor.h
@@ -974,6 +974,37 @@
#define PVR_5200B 0x80822014
/*
+ * 405EX/EXr CHIP_21 Errata
+ */
+#ifdef CONFIG_SYS_4xx_CHIP_21_405EX_SECURITY
+#define CONFIG_SYS_4xx_CHIP_21_ERRATA
+#define CONFIG_405EX_CHIP21_PVR_REV_C PVR_405EX1_RC
+#define CONFIG_405EX_CHIP21_PVR_REV_D PVR_405EX1_RD
+#define CONFIG_405EX_CHIP21_ECID3_REV_D 0x0
+#endif
+
+#ifdef CONFIG_SYS_4xx_CHIP_21_405EX_NO_SECURITY
+#define CONFIG_SYS_4xx_CHIP_21_ERRATA
+#define CONFIG_405EX_CHIP21_PVR_REV_C PVR_405EX2_RC
+#define CONFIG_405EX_CHIP21_PVR_REV_D PVR_405EX2_RD
+#define CONFIG_405EX_CHIP21_ECID3_REV_D 0x1
+#endif
+
+#ifdef CONFIG_SYS_4xx_CHIP_21_405EXr_SECURITY
+#define CONFIG_SYS_4xx_CHIP_21_ERRATA
+#define CONFIG_405EX_CHIP21_PVR_REV_C PVR_405EXR1_RC
+#define CONFIG_405EX_CHIP21_PVR_REV_D PVR_405EXR1_RD
+#define CONFIG_405EX_CHIP21_ECID3_REV_D 0x2
+#endif
+
+#ifdef CONFIG_SYS_4xx_CHIP_21_405EXr_NO_SECURITY
+#define CONFIG_SYS_4xx_CHIP_21_ERRATA
+#define CONFIG_405EX_CHIP21_PVR_REV_C PVR_405EXR2_RC
+#define CONFIG_405EX_CHIP21_PVR_REV_D PVR_405EXR2_RD
+#define CONFIG_405EX_CHIP21_ECID3_REV_D 0x3
+#endif
+
+/*
* System Version Register
*/