From d8556db1d4d97b03b7868cae12800ecee877c8b4 Mon Sep 17 00:00:00 2001
From: York Sun <yorksun@freescale.com>
Date: Tue, 25 Jun 2013 11:37:45 -0700
Subject: [PATCH] powerpc/mpc8xxx: Set inactive csn_bnds to 0xffffffff
When chip select interleaving is enabled, cs0_bnds is used for address
binding. Other csn_bnds are not used. When two controllers interleaving is
enabled, cs0_bnds of both controllers are used, other csn_bnds are not.
However, the unused csn_bnds may be used internally for calculating
addresses for calibration. Setting those registers to 0 may confuse
controllers in some cases. Instead, setting them to 0xffffffff together
with normal LAWs will guarantee the address is not mapped to DDR.
Signed-off-by: York Sun <yorksun@freescale.com>
---
arch/powerpc/cpu/mpc8xxx/ddr/ctrl_regs.c | 4 ++--
arch/powerpc/cpu/mpc8xxx/ddr/main.c | 8 +++++++-
2 files changed, 9 insertions(+), 3 deletions(-)
diff --git a/arch/powerpc/cpu/mpc8xxx/ddr/ctrl_regs.c b/arch/powerpc/cpu/mpc8xxx/ddr/ctrl_regs.c
index 0f73e9c6c6..b5e4070414 100644
--- a/arch/powerpc/cpu/mpc8xxx/ddr/ctrl_regs.c
+++ b/arch/powerpc/cpu/mpc8xxx/ddr/ctrl_regs.c
@@ -1585,8 +1585,8 @@ compute_fsl_memctl_config_regs(const memctl_options_t *popts,
| ((ea & 0xFFF) << 0) /* ending address MSB */
);
} else {
- debug("FSLDDR: setting bnds to 0 for inactive CS\n");
- ddr->cs[i].bnds = 0;
+ /* setting bnds to 0xffffffff for inactive CS */
+ ddr->cs[i].bnds = 0xffffffff;
}
debug("FSLDDR: cs[%d]_bnds = 0x%08x\n", i, ddr->cs[i].bnds);
diff --git a/arch/powerpc/cpu/mpc8xxx/ddr/main.c b/arch/powerpc/cpu/mpc8xxx/ddr/main.c
index 7a8636de16..c35405dcc9 100644
--- a/arch/powerpc/cpu/mpc8xxx/ddr/main.c
+++ b/arch/powerpc/cpu/mpc8xxx/ddr/main.c
@@ -504,7 +504,13 @@ fsl_ddr_compute(fsl_ddr_info_t *pinfo, unsigned int start_step,
fsl_ddr_cfg_regs_t *reg = &ddr_reg[i];
if (reg->cs[j].config & 0x80000000) {
unsigned int end;
- end = reg->cs[j].bnds & 0xFFF;
+ /*
+ * 0xfffffff is a special value we put
+ * for unused bnds
+ */
+ if (reg->cs[j].bnds == 0xffffffff)
+ continue;
+ end = reg->cs[j].bnds & 0xffff;
if (end > max_end) {
max_end = end;
}
--
2.39.5