[U-Boot] [PATCH] 85xx: Add CPU 2 errata workaround to all 8548 boards

[Peter Tyser]

All mpc8548-based boards should implement the suggested workaround
to CPU 2 errata. Without the workaround, its possible for the
8548's core to hang while executing a msync or mbar 0 instruction
and a snoopable transaction from an I/O master tagged to make
quick forward progress is present.

Signed-off-by: Peter Tyser <ptyser at xes-inc.com>
---
Changes since v1:
- Use out/in _be32 access functions

 board/freescale/mpc8548cds/mpc8548cds.c |   12 ------------
 board/sbc8548/sbc8548.c                 |    7 -------
 cpu/mpc85xx/cpu_init.c                  |   13 +++++++++++++
 3 files changed, 13 insertions(+), 19 deletions(-)

diff --git a/board/freescale/mpc8548cds/mpc8548cds.c b/board/freescale/mpc8548cds/mpc8548cds.c
index 6eb62ea..6f56208 100644
--- a/board/freescale/mpc8548cds/mpc8548cds.c
+++ b/board/freescale/mpc8548cds/mpc8548cds.c
@@ -56,7 +56,6 @@ int checkboard (void)
 	uint pci_slot = get_pci_slot ();
 
 	uint cpu_board_rev = get_cpu_board_revision ();
-	uint svr;
 
 	printf ("Board: CDS Version 0x%02x, PCI Slot %d\n",
 		get_board_version (), pci_slot);
@@ -69,17 +68,6 @@ int checkboard (void)
 	 */
 	local_bus_init ();
 
-	svr = get_svr();
-
-	/*
-	 * Fix CPU2 errata: A core hang possible while executing a
-	 * msync instruction and a snoopable transaction from an I/O
-	 * master tagged to make quick forward progress is present.
-	 * Fixed in Silicon Rev.2.1
-	 */
-	if (!(SVR_MAJ(svr) >= 2 && SVR_MIN(svr) >= 1))
-		ecm->eebpcr |= (1 << 16);
-
 	/*
 	 * Hack TSEC 3 and 4 IO voltages.
 	 */
diff --git a/board/sbc8548/sbc8548.c b/board/sbc8548/sbc8548.c
index e27c92d..0ffbcb8 100644
--- a/board/sbc8548/sbc8548.c
+++ b/board/sbc8548/sbc8548.c
@@ -66,13 +66,6 @@ int checkboard (void)
 	local_bus_init ();
 
 	/*
-	 * Fix CPU2 errata: A core hang possible while executing a
-	 * msync instruction and a snoopable transaction from an I/O
-	 * master tagged to make quick forward progress is present.
-	 */
-	ecm->eebpcr |= (1 << 16);
-
-	/*
 	 * Hack TSEC 3 and 4 IO voltages.
 	 */
 	gur->tsec34ioovcr = 0xe7e0;	/*  1110 0111 1110 0xxx */
diff --git a/cpu/mpc85xx/cpu_init.c b/cpu/mpc85xx/cpu_init.c
index 3a8aef2..5862bd6 100644
--- a/cpu/mpc85xx/cpu_init.c
+++ b/cpu/mpc85xx/cpu_init.c
@@ -174,6 +174,19 @@ void cpu_init_f (void)
 {
 	volatile ccsr_lbc_t *memctl = (void *)(CONFIG_SYS_MPC85xx_LBC_ADDR);
 	extern void m8560_cpm_reset (void);
+#ifdef CONFIG_MPC8548
+	ccsr_local_ecm_t *ecm = (void *)(CONFIG_SYS_MPC85xx_ECM_ADDR);
+	uint svr = get_svr();
+
+	/*
+	 * CPU2 errata workaround: A core hang possible while executing
+	 * a msync instruction and a snoopable transaction from an I/O
+	 * master tagged to make quick forward progress is present.
+	 * Fixed in silicon rev 2.1.
+	 */
+	if ((SVR_MAJ(svr) == 1) || ((SVR_MAJ(svr) == 2 && SVR_MIN(svr) == 0x0)))
+		out_be32(&ecm->eebpcr, in_be32(&ecm->eebpcr) | (1 << 16));
+#endif
 
 	disable_tlb(14);
 	disable_tlb(15);
-- 
1.6.0.2.GIT