[U-Boot] [PATCH v3] PPC405EX CHIP_21 erratum
Steven A. Falco
sfalco at harris.com
Thu May 5 16:08:35 CEST 2011
APM errata CHIP_21 for the 405EX/EXr (from the rev 1.09 document dated
4/27/11) states that rev D processors may wake up with the wrong feature
set. This patch implements the APM-proposed workaround.
To enable this patch for your board, add the appropriate define for your
CPU to your board header file. See kilauea.h for more information. The
following variants are supported:
#define CONFIG_SYS_4xx_CHIP_21_405EX_NO_SECURITY
#define CONFIG_SYS_4xx_CHIP_21_405EX_SECURITY
#define CONFIG_SYS_4xx_CHIP_21_405EXr_NO_SECURITY
#define CONFIG_SYS_4xx_CHIP_21_405EXr_SECURITY
Please note that if you select the wrong define, your board will not
boot, and JTAG will be required to recover.
Tested on custom boards using:
CONFIG_SYS_4xx_CHIP_21_405EX_NO_SECURITY <sfalco at harris.com>
CONFIG_SYS_4xx_CHIP_21_405EX_SECURITY <eibach at gdsys.de>
Signed-off-by: Steve Falco <sfalco at harris.com>
Acked-by: Dirk Eibach <eibach at gdsys.de>
---
v3:
Remove enable of workaround for Kilauea/Haleakala. Instead, all
variants are listed with a detailed comment explaining proper usage.
This is necessary because the same u-boot binary is used on boards
with different processors. Since there is currently no known way
to distinguish those processors, there is no way to universally work
around the errata. Each Kilauea/Haleakala owner must build a unique
version of u-boot tailored to their particular board.
v2:
Correct checkpatch errors/warnings re: whitespace, comment style, etc.
Move PVR logic out of board config file.
Simplify ifdef structure.
diff --git a/arch/powerpc/cpu/ppc4xx/cpu_init.c b/arch/powerpc/cpu/ppc4xx/cpu_init.c
index bf208ad..2f3a802 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
*/
diff --git a/include/configs/kilauea.h b/include/configs/kilauea.h
index 031f8fb..e66aadf 100644
--- a/include/configs/kilauea.h
+++ b/include/configs/kilauea.h
@@ -44,6 +44,20 @@
#endif
/*
+ * CHIP_21 errata - you must set this to match your exact CPU, else your
+ * board will not boot. DO NOT enable this unless you have JTAG available
+ * for recovery, in the event you get it wrong.
+ *
+ * Kilauea uses the 405EX, while Haleakala uses the 405EXr. Either board
+ * may be equipped for security or not. You must look at the CPU part
+ * number to be sure what you have.
+ */
+/* #define CONFIG_SYS_4xx_CHIP_21_405EX_NO_SECURITY */
+/* #define CONFIG_SYS_4xx_CHIP_21_405EX_SECURITY */
+/* #define CONFIG_SYS_4xx_CHIP_21_405EXr_NO_SECURITY */
+/* #define CONFIG_SYS_4xx_CHIP_21_405EXr_SECURITY */
+
+/*
* Include common defines/options for all AMCC eval boards
*/
#define CONFIG_HOSTNAME kilauea
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