From 074596c0b5f4e9a3642a3159a9fc7f8b8064c18a Mon Sep 17 00:00:00 2001
From: Shengzhou Liu <Shengzhou.Liu@nxp.com>
Date: Thu, 7 Apr 2016 16:22:21 +0800
Subject: armv8/ls1043: Add workaround for DDR erratum A-008850

Barrier transactions from CCI400 need to be disabled till
the DDR is configured, otherwise it may lead to system hang.
The patch adds workaround to fix the erratum.

Signed-off-by: Shengzhou Liu <Shengzhou.Liu@nxp.com>
Reviewed-by: York Sun <york.sun@nxp.com>
---
 arch/arm/cpu/armv8/fsl-layerscape/soc.c | 36 +++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

(limited to 'arch/arm/cpu/armv8')

diff --git a/arch/arm/cpu/armv8/fsl-layerscape/soc.c b/arch/arm/cpu/armv8/fsl-layerscape/soc.c
index 0cb010012e..0fb5c7f0cc 100644
--- a/arch/arm/cpu/armv8/fsl-layerscape/soc.c
+++ b/arch/arm/cpu/armv8/fsl-layerscape/soc.c
@@ -12,6 +12,8 @@
 #include <asm/io.h>
 #include <asm/global_data.h>
 #include <asm/arch-fsl-layerscape/config.h>
+#include <fsl_ddr_sdram.h>
+#include <fsl_ddr.h>
 #ifdef CONFIG_CHAIN_OF_TRUST
 #include <fsl_validate.h>
 #endif
@@ -271,6 +273,39 @@ static void erratum_a009660(void)
 #endif
 }
 
+static void erratum_a008850_early(void)
+{
+#ifdef CONFIG_SYS_FSL_ERRATUM_A008850
+	/* part 1 of 2 */
+	struct ccsr_cci400 __iomem *cci = (void *)CONFIG_SYS_CCI400_ADDR;
+	struct ccsr_ddr __iomem *ddr = (void *)CONFIG_SYS_FSL_DDR_ADDR;
+
+	/* disables propagation of barrier transactions to DDRC from CCI400 */
+	out_le32(&cci->ctrl_ord, CCI400_CTRLORD_TERM_BARRIER);
+
+	/* disable the re-ordering in DDRC */
+	ddr_out32(&ddr->eor, DDR_EOR_RD_REOD_DIS | DDR_EOR_WD_REOD_DIS);
+#endif
+}
+
+void erratum_a008850_post(void)
+{
+#ifdef CONFIG_SYS_FSL_ERRATUM_A008850
+	/* part 2 of 2 */
+	struct ccsr_cci400 __iomem *cci = (void *)CONFIG_SYS_CCI400_ADDR;
+	struct ccsr_ddr __iomem *ddr = (void *)CONFIG_SYS_FSL_DDR_ADDR;
+	u32 tmp;
+
+	/* enable propagation of barrier transactions to DDRC from CCI400 */
+	out_le32(&cci->ctrl_ord, CCI400_CTRLORD_EN_BARRIER);
+
+	/* enable the re-ordering in DDRC */
+	tmp = ddr_in32(&ddr->eor);
+	tmp &= ~(DDR_EOR_RD_REOD_DIS | DDR_EOR_WD_REOD_DIS);
+	ddr_out32(&ddr->eor, tmp);
+#endif
+}
+
 void fsl_lsch2_early_init_f(void)
 {
 	struct ccsr_cci400 *cci = (struct ccsr_cci400 *)CONFIG_SYS_CCI400_ADDR;
@@ -295,6 +330,7 @@ void fsl_lsch2_early_init_f(void)
 		 CCI400_DVM_MESSAGE_REQ_EN | CCI400_SNOOP_REQ_EN);
 
 	/* Erratum */
+	erratum_a008850_early(); /* part 1 of 2 */
 	erratum_a009929();
 	erratum_a009660();
 }
-- 
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