[U-Boot] [PATCH 3/4] powerpc/P1010: Add workaround for erratum P1010-A003549 (related to IFC)

[Kumar Gala <galak@kernel.crashing.org>]

From: Poonam Aggrwal <poonam.aggrwal@freescale.com>

Issue:
Peripheral connected to IFC_CS3 may hamper booting from IFC.

Impact:
Boot from IFC may not be successful if IFC_CS3 is used.

Workaround:
If IFC_CS3 is used, gate IFC_CS3 while booting from NAND or NOR.
Also Software should select IFC_CS3 using PMUXCR[26:27] = 0x01.

Signed-off-by: Poonam Aggrwal <poonam.aggrwal@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
---
 arch/powerpc/cpu/mpc85xx/cmd_errata.c     |    3 +++
 arch/powerpc/cpu/mpc85xx/cpu_init_early.c |   12 ++++++++++++
 arch/powerpc/include/asm/config_mpc85xx.h |    2 ++
 3 files changed, 17 insertions(+), 0 deletions(-)

diff --git a/arch/powerpc/cpu/mpc85xx/cmd_errata.c b/arch/powerpc/cpu/mpc85xx/cmd_errata.c
index 446f759..c2fb5b8 100644
--- a/arch/powerpc/cpu/mpc85xx/cmd_errata.c
+++ b/arch/powerpc/cpu/mpc85xx/cmd_errata.c
@@ -90,6 +90,9 @@ static int do_errata(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 #ifdef CONFIG_SYS_FSL_ERRATUM_IFC_A002769
 	puts("Work-around for Erratum IFC-A002769 enabled\n");
 #endif
+#ifdef CONFIG_SYS_FSL_ERRATUM_P1010_A003549
+	puts("Work-around for Erratum P1010-A003549 enabled\n");
+#endif
 	return 0;
 }
 
diff --git a/arch/powerpc/cpu/mpc85xx/cpu_init_early.c b/arch/powerpc/cpu/mpc85xx/cpu_init_early.c
index 97e8424..05097b9 100644
--- a/arch/powerpc/cpu/mpc85xx/cpu_init_early.c
+++ b/arch/powerpc/cpu/mpc85xx/cpu_init_early.c
@@ -83,6 +83,9 @@ void cpu_init_early_f(void)
 {
 	u32 mas0, mas1, mas2, mas3, mas7;
 	int i;
+#ifdef CONFIG_SYS_FSL_ERRATUM_P1010_A003549
+	ccsr_gur_t *gur = (void *)(CONFIG_SYS_MPC85xx_GUTS_ADDR);
+#endif
 
 	/* Pointer is writable since we allocated a register for it */
 	gd = (gd_t *) (CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_GBL_DATA_OFFSET);
@@ -115,6 +118,15 @@ void cpu_init_early_f(void)
 	setup_ccsrbar();
 #endif
 
+/*
+ * Work Around for IFC Erratum A-003549. This issue is P1010
+ * specific. LCLK(a free running clk signal) is muxed with IFC_CS3 on P1010 SOC
+ * Hence specifically selecting CS3.
+ */
+#ifdef CONFIG_SYS_FSL_ERRATUM_P1010_A003549
+	setbits_be32(&gur->pmuxcr, MPC85xx_PMUXCR_LCLK_IFC_CS3);
+#endif
+
 	init_laws();
 	invalidate_tlb(1);
 	init_tlbs();
diff --git a/arch/powerpc/include/asm/config_mpc85xx.h b/arch/powerpc/include/asm/config_mpc85xx.h
index ccd8246..171ea12 100644
--- a/arch/powerpc/include/asm/config_mpc85xx.h
+++ b/arch/powerpc/include/asm/config_mpc85xx.h
@@ -113,6 +113,7 @@
 #define CONFIG_SYS_FSL_PCIE_COMPAT	"fsl,qoriq-pcie-v2.2"
 #define CONFIG_SYS_FSL_USB_INTERNAL_UTMI_PHY
 #define CONFIG_SYS_FSL_ERRATUM_IFC_A002769
+#define CONFIG_SYS_FSL_ERRATUM_P1010_A003549
 
 /* P1011 is single core version of P1020 */
 #elif defined(CONFIG_P1011)
@@ -162,6 +163,7 @@
 #define CONFIG_SYS_CCSRBAR_DEFAULT	0xff700000
 #define CONFIG_SYS_FSL_USB_INTERNAL_UTMI_PHY
 #define CONFIG_SYS_FSL_ERRATUM_IFC_A002769
+#define CONFIG_SYS_FSL_ERRATUM_P1010_A003549
 
 /* P1015 is single core version of P1024 */
 #elif defined(CONFIG_P1015)
-- 
1.7.3.4