From 7cad2e38d61e27ea59fb7944f7e647e97ef292d3 Mon Sep 17 00:00:00 2001
From: Ruchika Gupta <ruchika.gupta@freescale.com>
Date: Mon, 29 Sep 2014 11:35:33 +0530
Subject: [PATCH] powerpc/mpc85xx: SECURE BOOT - Bypass PAMU in case of secure
boot
By default, PAMU's (IOMMU) are enabled in case of secure boot.
Disable/bypass them once the control reaches the bootloader.
For non-secure boot, PAMU's are already bypassed in the default
SoC configuration.
Signed-off-by: Ruchika Gupta <ruchika.gupta@freescale.com>
Reviewed-by: York Sun <yorksun@freescale.com>
---
arch/powerpc/cpu/mpc85xx/cpu_init.c | 9 ++++++++-
arch/powerpc/include/asm/immap_85xx.h | 1 +
2 files changed, 9 insertions(+), 1 deletion(-)
diff --git a/arch/powerpc/cpu/mpc85xx/cpu_init.c b/arch/powerpc/cpu/mpc85xx/cpu_init.c
index 963e32676b..85d32fc612 100644
--- a/arch/powerpc/cpu/mpc85xx/cpu_init.c
+++ b/arch/powerpc/cpu/mpc85xx/cpu_init.c
@@ -426,7 +426,8 @@ ulong cpu_init_f(void)
{
ulong flag = 0;
extern void m8560_cpm_reset (void);
-#ifdef CONFIG_SYS_DCSRBAR_PHYS
+#if defined(CONFIG_SYS_DCSRBAR_PHYS) || \
+ (defined(CONFIG_SECURE_BOOT) && defined(CONFIG_FSL_CORENET))
ccsr_gur_t *gur = (void *)(CONFIG_SYS_MPC85xx_GUTS_ADDR);
#endif
#if defined(CONFIG_SECURE_BOOT)
@@ -458,6 +459,12 @@ ulong cpu_init_f(void)
#if defined(CONFIG_SYS_CPC_REINIT_F)
disable_cpc_sram();
#endif
+
+#if defined(CONFIG_FSL_CORENET)
+ /* Put PAMU in bypass mode */
+ out_be32(&gur->pamubypenr, FSL_CORENET_PAMU_BYPASS);
+#endif
+
#endif
#ifdef CONFIG_CPM2
diff --git a/arch/powerpc/include/asm/immap_85xx.h b/arch/powerpc/include/asm/immap_85xx.h
index 88c1e08df5..0264523d64 100644
--- a/arch/powerpc/include/asm/immap_85xx.h
+++ b/arch/powerpc/include/asm/immap_85xx.h
@@ -1912,6 +1912,7 @@ defined(CONFIG_PPC_T1020) || defined(CONFIG_PPC_T1022)
u8 res24[64];
u32 pblsr; /* Preboot loader status */
u32 pamubypenr; /* PAMU bypass enable */
+#define FSL_CORENET_PAMU_BYPASS 0xffff0000
u32 dmacr1; /* DMA control */
u8 res25[4];
u32 gensr1; /* General status */
--
2.39.5